Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1 | /* |
| 2 | * ring buffer based function tracer |
| 3 | * |
| 4 | * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> |
| 5 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> |
| 6 | * |
| 7 | * Originally taken from the RT patch by: |
| 8 | * Arnaldo Carvalho de Melo <acme@redhat.com> |
| 9 | * |
| 10 | * Based on code from the latency_tracer, that is: |
| 11 | * Copyright (C) 2004-2006 Ingo Molnar |
| 12 | * Copyright (C) 2004 William Lee Irwin III |
| 13 | */ |
| 14 | #include <linux/utsrelease.h> |
| 15 | #include <linux/kallsyms.h> |
| 16 | #include <linux/seq_file.h> |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 17 | #include <linux/notifier.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 18 | #include <linux/debugfs.h> |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 19 | #include <linux/pagemap.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 20 | #include <linux/hardirq.h> |
| 21 | #include <linux/linkage.h> |
| 22 | #include <linux/uaccess.h> |
| 23 | #include <linux/ftrace.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/percpu.h> |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 26 | #include <linux/kdebug.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 27 | #include <linux/ctype.h> |
| 28 | #include <linux/init.h> |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 29 | #include <linux/poll.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 30 | #include <linux/gfp.h> |
| 31 | #include <linux/fs.h> |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 32 | #include <linux/kprobes.h> |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 33 | #include <linux/writeback.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 34 | |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 35 | #include <linux/stacktrace.h> |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 36 | #include <linux/ring_buffer.h> |
Frederic Weisbecker | 21798a8 | 2008-10-28 09:43:26 +0100 | [diff] [blame] | 37 | #include <linux/irqflags.h> |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 38 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 39 | #include "trace.h" |
| 40 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 41 | #define TRACE_BUFFER_FLAGS (RB_FL_OVERWRITE) |
| 42 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 43 | unsigned long __read_mostly tracing_max_latency = (cycle_t)ULONG_MAX; |
| 44 | unsigned long __read_mostly tracing_thresh; |
| 45 | |
Frederic Weisbecker | adf9f19 | 2008-11-17 19:23:42 +0100 | [diff] [blame] | 46 | /* For tracers that don't implement custom flags */ |
| 47 | static struct tracer_opt dummy_tracer_opt[] = { |
| 48 | { } |
| 49 | }; |
| 50 | |
| 51 | static struct tracer_flags dummy_tracer_flags = { |
| 52 | .val = 0, |
| 53 | .opts = dummy_tracer_opt |
| 54 | }; |
| 55 | |
| 56 | static int dummy_set_flag(u32 old_flags, u32 bit, int set) |
| 57 | { |
| 58 | return 0; |
| 59 | } |
Steven Rostedt | 0f04870 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 60 | |
| 61 | /* |
| 62 | * Kill all tracing for good (never come back). |
| 63 | * It is initialized to 1 but will turn to zero if the initialization |
| 64 | * of the tracer is successful. But that is the only place that sets |
| 65 | * this back to zero. |
| 66 | */ |
| 67 | int tracing_disabled = 1; |
| 68 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 69 | static DEFINE_PER_CPU(local_t, ftrace_cpu_disabled); |
| 70 | |
| 71 | static inline void ftrace_disable_cpu(void) |
| 72 | { |
| 73 | preempt_disable(); |
| 74 | local_inc(&__get_cpu_var(ftrace_cpu_disabled)); |
| 75 | } |
| 76 | |
| 77 | static inline void ftrace_enable_cpu(void) |
| 78 | { |
| 79 | local_dec(&__get_cpu_var(ftrace_cpu_disabled)); |
| 80 | preempt_enable(); |
| 81 | } |
| 82 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 83 | static cpumask_t __read_mostly tracing_buffer_mask; |
| 84 | |
| 85 | #define for_each_tracing_cpu(cpu) \ |
| 86 | for_each_cpu_mask(cpu, tracing_buffer_mask) |
| 87 | |
Steven Rostedt | 944ac42 | 2008-10-23 19:26:08 -0400 | [diff] [blame] | 88 | /* |
| 89 | * ftrace_dump_on_oops - variable to dump ftrace buffer on oops |
| 90 | * |
| 91 | * If there is an oops (or kernel panic) and the ftrace_dump_on_oops |
| 92 | * is set, then ftrace_dump is called. This will output the contents |
| 93 | * of the ftrace buffers to the console. This is very useful for |
| 94 | * capturing traces that lead to crashes and outputing it to a |
| 95 | * serial console. |
| 96 | * |
| 97 | * It is default off, but you can enable it with either specifying |
| 98 | * "ftrace_dump_on_oops" in the kernel command line, or setting |
| 99 | * /proc/sys/kernel/ftrace_dump_on_oops to true. |
| 100 | */ |
| 101 | int ftrace_dump_on_oops; |
| 102 | |
Peter Zijlstra | d9e5407 | 2008-11-01 19:57:37 +0100 | [diff] [blame] | 103 | static int tracing_set_tracer(char *buf); |
| 104 | |
| 105 | static int __init set_ftrace(char *str) |
| 106 | { |
| 107 | tracing_set_tracer(str); |
| 108 | return 1; |
| 109 | } |
| 110 | __setup("ftrace", set_ftrace); |
| 111 | |
Steven Rostedt | 944ac42 | 2008-10-23 19:26:08 -0400 | [diff] [blame] | 112 | static int __init set_ftrace_dump_on_oops(char *str) |
| 113 | { |
| 114 | ftrace_dump_on_oops = 1; |
| 115 | return 1; |
| 116 | } |
| 117 | __setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops); |
| 118 | |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 119 | long |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 120 | ns2usecs(cycle_t nsec) |
| 121 | { |
| 122 | nsec += 500; |
| 123 | do_div(nsec, 1000); |
| 124 | return nsec; |
| 125 | } |
| 126 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 127 | cycle_t ftrace_now(int cpu) |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 128 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 129 | u64 ts = ring_buffer_time_stamp(cpu); |
| 130 | ring_buffer_normalize_time_stamp(cpu, &ts); |
| 131 | return ts; |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 132 | } |
| 133 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 134 | /* |
| 135 | * The global_trace is the descriptor that holds the tracing |
| 136 | * buffers for the live tracing. For each CPU, it contains |
| 137 | * a link list of pages that will store trace entries. The |
| 138 | * page descriptor of the pages in the memory is used to hold |
| 139 | * the link list by linking the lru item in the page descriptor |
| 140 | * to each of the pages in the buffer per CPU. |
| 141 | * |
| 142 | * For each active CPU there is a data field that holds the |
| 143 | * pages for the buffer for that CPU. Each CPU has the same number |
| 144 | * of pages allocated for its buffer. |
| 145 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 146 | static struct trace_array global_trace; |
| 147 | |
| 148 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); |
| 149 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 150 | /* |
| 151 | * The max_tr is used to snapshot the global_trace when a maximum |
| 152 | * latency is reached. Some tracers will use this to store a maximum |
| 153 | * trace while it continues examining live traces. |
| 154 | * |
| 155 | * The buffers for the max_tr are set up the same as the global_trace. |
| 156 | * When a snapshot is taken, the link list of the max_tr is swapped |
| 157 | * with the link list of the global_trace and the buffers are reset for |
| 158 | * the global_trace so the tracing can continue. |
| 159 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 160 | static struct trace_array max_tr; |
| 161 | |
| 162 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); |
| 163 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 164 | /* tracer_enabled is used to toggle activation of a tracer */ |
Steven Rostedt | 26994ea | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 165 | static int tracer_enabled = 1; |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 166 | |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 167 | /** |
| 168 | * tracing_is_enabled - return tracer_enabled status |
| 169 | * |
| 170 | * This function is used by other tracers to know the status |
| 171 | * of the tracer_enabled flag. Tracers may use this function |
| 172 | * to know if it should enable their features when starting |
| 173 | * up. See irqsoff tracer for an example (start_irqsoff_tracer). |
| 174 | */ |
| 175 | int tracing_is_enabled(void) |
| 176 | { |
| 177 | return tracer_enabled; |
| 178 | } |
| 179 | |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 180 | /* function tracing enabled */ |
| 181 | int ftrace_function_enabled; |
| 182 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 183 | /* |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 184 | * trace_buf_size is the size in bytes that is allocated |
| 185 | * for a buffer. Note, the number of bytes is always rounded |
| 186 | * to page size. |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 187 | * |
| 188 | * This number is purposely set to a low number of 16384. |
| 189 | * If the dump on oops happens, it will be much appreciated |
| 190 | * to not have to wait for all that output. Anyway this can be |
| 191 | * boot time and run time configurable. |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 192 | */ |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 193 | #define TRACE_BUF_SIZE_DEFAULT 1441792UL /* 16384 * 88 (sizeof(entry)) */ |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 194 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 195 | static unsigned long trace_buf_size = TRACE_BUF_SIZE_DEFAULT; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 196 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 197 | /* trace_types holds a link list of available tracers. */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 198 | static struct tracer *trace_types __read_mostly; |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 199 | |
| 200 | /* current_trace points to the tracer that is currently active */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 201 | static struct tracer *current_trace __read_mostly; |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 202 | |
| 203 | /* |
| 204 | * max_tracer_type_len is used to simplify the allocating of |
| 205 | * buffers to read userspace tracer names. We keep track of |
| 206 | * the longest tracer name registered. |
| 207 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 208 | static int max_tracer_type_len; |
| 209 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 210 | /* |
| 211 | * trace_types_lock is used to protect the trace_types list. |
| 212 | * This lock is also used to keep user access serialized. |
| 213 | * Accesses from userspace will grab this lock while userspace |
| 214 | * activities happen inside the kernel. |
| 215 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 216 | static DEFINE_MUTEX(trace_types_lock); |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 217 | |
| 218 | /* trace_wait is a waitqueue for tasks blocked on trace_poll */ |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 219 | static DECLARE_WAIT_QUEUE_HEAD(trace_wait); |
| 220 | |
Steven Rostedt | ee6bce5 | 2008-11-12 17:52:37 -0500 | [diff] [blame] | 221 | /* trace_flags holds trace_options default values */ |
Steven Rostedt | 12ef7d4 | 2008-11-12 17:52:38 -0500 | [diff] [blame] | 222 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK | |
| 223 | TRACE_ITER_ANNOTATE; |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 224 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 225 | /** |
| 226 | * trace_wake_up - wake up tasks waiting for trace input |
| 227 | * |
| 228 | * Simply wakes up any task that is blocked on the trace_wait |
| 229 | * queue. These is used with trace_poll for tasks polling the trace. |
| 230 | */ |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 231 | void trace_wake_up(void) |
| 232 | { |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 233 | /* |
| 234 | * The runqueue_is_locked() can fail, but this is the best we |
| 235 | * have for now: |
| 236 | */ |
| 237 | if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 238 | wake_up(&trace_wait); |
| 239 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 240 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 241 | static int __init set_buf_size(char *str) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 242 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 243 | unsigned long buf_size; |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 244 | int ret; |
| 245 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 246 | if (!str) |
| 247 | return 0; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 248 | ret = strict_strtoul(str, 0, &buf_size); |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 249 | /* nr_entries can not be zero */ |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 250 | if (ret < 0 || buf_size == 0) |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 251 | return 0; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 252 | trace_buf_size = buf_size; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 253 | return 1; |
| 254 | } |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 255 | __setup("trace_buf_size=", set_buf_size); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 256 | |
Steven Rostedt | 57f50be | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 257 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
| 258 | { |
| 259 | return nsecs / 1000; |
| 260 | } |
| 261 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 262 | /* These must match the bit postions in trace_iterator_flags */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 263 | static const char *trace_options[] = { |
| 264 | "print-parent", |
| 265 | "sym-offset", |
| 266 | "sym-addr", |
| 267 | "verbose", |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 268 | "raw", |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 269 | "hex", |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 270 | "bin", |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 271 | "block", |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 272 | "stacktrace", |
Ingo Molnar | 4ac3ba4 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 273 | "sched-tree", |
Peter Zijlstra | f09ce57 | 2008-09-04 10:24:14 +0200 | [diff] [blame] | 274 | "ftrace_printk", |
Steven Rostedt | b2a866f | 2008-11-03 23:15:57 -0500 | [diff] [blame] | 275 | "ftrace_preempt", |
Steven Rostedt | 9f029e8 | 2008-11-12 15:24:24 -0500 | [diff] [blame] | 276 | "branch", |
Steven Rostedt | 12ef7d4 | 2008-11-12 17:52:38 -0500 | [diff] [blame] | 277 | "annotate", |
Török Edwin | 02b6751 | 2008-11-22 13:28:47 +0200 | [diff] [blame^] | 278 | "userstacktrace", |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 279 | NULL |
| 280 | }; |
| 281 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 282 | /* |
| 283 | * ftrace_max_lock is used to protect the swapping of buffers |
| 284 | * when taking a max snapshot. The buffers themselves are |
| 285 | * protected by per_cpu spinlocks. But the action of the swap |
| 286 | * needs its own lock. |
| 287 | * |
| 288 | * This is defined as a raw_spinlock_t in order to help |
| 289 | * with performance when lockdep debugging is enabled. |
| 290 | */ |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 291 | static raw_spinlock_t ftrace_max_lock = |
| 292 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 293 | |
| 294 | /* |
| 295 | * Copy the new maximum trace into the separate maximum-trace |
| 296 | * structure. (this way the maximum trace is permanently saved, |
| 297 | * for later retrieval via /debugfs/tracing/latency_trace) |
| 298 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 299 | static void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 300 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 301 | { |
| 302 | struct trace_array_cpu *data = tr->data[cpu]; |
| 303 | |
| 304 | max_tr.cpu = cpu; |
| 305 | max_tr.time_start = data->preempt_timestamp; |
| 306 | |
| 307 | data = max_tr.data[cpu]; |
| 308 | data->saved_latency = tracing_max_latency; |
| 309 | |
| 310 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); |
| 311 | data->pid = tsk->pid; |
| 312 | data->uid = tsk->uid; |
| 313 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; |
| 314 | data->policy = tsk->policy; |
| 315 | data->rt_priority = tsk->rt_priority; |
| 316 | |
| 317 | /* record this tasks comm */ |
| 318 | tracing_record_cmdline(current); |
| 319 | } |
| 320 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 321 | /** |
| 322 | * trace_seq_printf - sequence printing of trace information |
| 323 | * @s: trace sequence descriptor |
| 324 | * @fmt: printf format string |
| 325 | * |
| 326 | * The tracer may use either sequence operations or its own |
| 327 | * copy to user routines. To simplify formating of a trace |
| 328 | * trace_seq_printf is used to store strings into a special |
| 329 | * buffer (@s). Then the output may be either used by |
| 330 | * the sequencer or pulled into another buffer. |
| 331 | */ |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 332 | int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 333 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
| 334 | { |
| 335 | int len = (PAGE_SIZE - 1) - s->len; |
| 336 | va_list ap; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 337 | int ret; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 338 | |
| 339 | if (!len) |
| 340 | return 0; |
| 341 | |
| 342 | va_start(ap, fmt); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 343 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 344 | va_end(ap); |
| 345 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 346 | /* If we can't write it all, don't bother writing anything */ |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 347 | if (ret >= len) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 348 | return 0; |
| 349 | |
| 350 | s->len += ret; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 351 | |
| 352 | return len; |
| 353 | } |
| 354 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 355 | /** |
| 356 | * trace_seq_puts - trace sequence printing of simple string |
| 357 | * @s: trace sequence descriptor |
| 358 | * @str: simple string to record |
| 359 | * |
| 360 | * The tracer may use either the sequence operations or its own |
| 361 | * copy to user routines. This function records a simple string |
| 362 | * into a special buffer (@s) for later retrieval by a sequencer |
| 363 | * or other mechanism. |
| 364 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 365 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 366 | trace_seq_puts(struct trace_seq *s, const char *str) |
| 367 | { |
| 368 | int len = strlen(str); |
| 369 | |
| 370 | if (len > ((PAGE_SIZE - 1) - s->len)) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 371 | return 0; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 372 | |
| 373 | memcpy(s->buffer + s->len, str, len); |
| 374 | s->len += len; |
| 375 | |
| 376 | return len; |
| 377 | } |
| 378 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 379 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 380 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
| 381 | { |
| 382 | if (s->len >= (PAGE_SIZE - 1)) |
| 383 | return 0; |
| 384 | |
| 385 | s->buffer[s->len++] = c; |
| 386 | |
| 387 | return 1; |
| 388 | } |
| 389 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 390 | static int |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 391 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
| 392 | { |
| 393 | if (len > ((PAGE_SIZE - 1) - s->len)) |
| 394 | return 0; |
| 395 | |
| 396 | memcpy(s->buffer + s->len, mem, len); |
| 397 | s->len += len; |
| 398 | |
| 399 | return len; |
| 400 | } |
| 401 | |
Harvey Harrison | ad0a3b6 | 2008-10-08 17:44:55 -0700 | [diff] [blame] | 402 | #define MAX_MEMHEX_BYTES 8 |
| 403 | #define HEX_CHARS (MAX_MEMHEX_BYTES*2 + 1) |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 404 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 405 | static int |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 406 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
| 407 | { |
| 408 | unsigned char hex[HEX_CHARS]; |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 409 | unsigned char *data = mem; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 410 | int i, j; |
| 411 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 412 | #ifdef __BIG_ENDIAN |
| 413 | for (i = 0, j = 0; i < len; i++) { |
| 414 | #else |
| 415 | for (i = len-1, j = 0; i >= 0; i--) { |
| 416 | #endif |
Harvey Harrison | 2fbc474 | 2008-10-08 16:51:49 -0700 | [diff] [blame] | 417 | hex[j++] = hex_asc_hi(data[i]); |
| 418 | hex[j++] = hex_asc_lo(data[i]); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 419 | } |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 420 | hex[j++] = ' '; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 421 | |
| 422 | return trace_seq_putmem(s, hex, j); |
| 423 | } |
| 424 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 425 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 426 | trace_seq_reset(struct trace_seq *s) |
| 427 | { |
| 428 | s->len = 0; |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 429 | s->readpos = 0; |
| 430 | } |
| 431 | |
| 432 | ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt) |
| 433 | { |
| 434 | int len; |
| 435 | int ret; |
| 436 | |
| 437 | if (s->len <= s->readpos) |
| 438 | return -EBUSY; |
| 439 | |
| 440 | len = s->len - s->readpos; |
| 441 | if (cnt > len) |
| 442 | cnt = len; |
| 443 | ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt); |
| 444 | if (ret) |
| 445 | return -EFAULT; |
| 446 | |
| 447 | s->readpos += len; |
| 448 | return cnt; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 449 | } |
| 450 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 451 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 452 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
| 453 | { |
| 454 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; |
| 455 | |
| 456 | s->buffer[len] = 0; |
| 457 | seq_puts(m, s->buffer); |
| 458 | |
| 459 | trace_seq_reset(s); |
| 460 | } |
| 461 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 462 | /** |
| 463 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr |
| 464 | * @tr: tracer |
| 465 | * @tsk: the task with the latency |
| 466 | * @cpu: The cpu that initiated the trace. |
| 467 | * |
| 468 | * Flip the buffers between the @tr and the max_tr and record information |
| 469 | * about which task was the cause of this latency. |
| 470 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 471 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 472 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 473 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 474 | struct ring_buffer *buf = tr->buffer; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 475 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 476 | WARN_ON_ONCE(!irqs_disabled()); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 477 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 478 | |
| 479 | tr->buffer = max_tr.buffer; |
| 480 | max_tr.buffer = buf; |
| 481 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 482 | ftrace_disable_cpu(); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 483 | ring_buffer_reset(tr->buffer); |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 484 | ftrace_enable_cpu(); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 485 | |
| 486 | __update_max_tr(tr, tsk, cpu); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 487 | __raw_spin_unlock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 488 | } |
| 489 | |
| 490 | /** |
| 491 | * update_max_tr_single - only copy one trace over, and reset the rest |
| 492 | * @tr - tracer |
| 493 | * @tsk - task with the latency |
| 494 | * @cpu - the cpu of the buffer to copy. |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 495 | * |
| 496 | * Flip the trace of a single CPU buffer between the @tr and the max_tr. |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 497 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 498 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 499 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 500 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 501 | int ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 502 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 503 | WARN_ON_ONCE(!irqs_disabled()); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 504 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 505 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 506 | ftrace_disable_cpu(); |
| 507 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 508 | ring_buffer_reset(max_tr.buffer); |
| 509 | ret = ring_buffer_swap_cpu(max_tr.buffer, tr->buffer, cpu); |
| 510 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 511 | ftrace_enable_cpu(); |
| 512 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 513 | WARN_ON_ONCE(ret); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 514 | |
| 515 | __update_max_tr(tr, tsk, cpu); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 516 | __raw_spin_unlock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 517 | } |
| 518 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 519 | /** |
| 520 | * register_tracer - register a tracer with the ftrace system. |
| 521 | * @type - the plugin for the tracer |
| 522 | * |
| 523 | * Register a new plugin tracer. |
| 524 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 525 | int register_tracer(struct tracer *type) |
| 526 | { |
| 527 | struct tracer *t; |
| 528 | int len; |
| 529 | int ret = 0; |
| 530 | |
| 531 | if (!type->name) { |
| 532 | pr_info("Tracer must have a name\n"); |
| 533 | return -1; |
| 534 | } |
| 535 | |
Ingo Molnar | 86fa2f6 | 2008-11-19 10:00:15 +0100 | [diff] [blame] | 536 | /* |
| 537 | * When this gets called we hold the BKL which means that |
| 538 | * preemption is disabled. Various trace selftests however |
| 539 | * need to disable and enable preemption for successful tests. |
| 540 | * So we drop the BKL here and grab it after the tests again. |
| 541 | */ |
| 542 | unlock_kernel(); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 543 | mutex_lock(&trace_types_lock); |
Ingo Molnar | 86fa2f6 | 2008-11-19 10:00:15 +0100 | [diff] [blame] | 544 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 545 | for (t = trace_types; t; t = t->next) { |
| 546 | if (strcmp(type->name, t->name) == 0) { |
| 547 | /* already found */ |
| 548 | pr_info("Trace %s already registered\n", |
| 549 | type->name); |
| 550 | ret = -1; |
| 551 | goto out; |
| 552 | } |
| 553 | } |
| 554 | |
Frederic Weisbecker | adf9f19 | 2008-11-17 19:23:42 +0100 | [diff] [blame] | 555 | if (!type->set_flag) |
| 556 | type->set_flag = &dummy_set_flag; |
| 557 | if (!type->flags) |
| 558 | type->flags = &dummy_tracer_flags; |
| 559 | else |
| 560 | if (!type->flags->opts) |
| 561 | type->flags->opts = dummy_tracer_opt; |
| 562 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 563 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
| 564 | if (type->selftest) { |
| 565 | struct tracer *saved_tracer = current_trace; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 566 | struct trace_array *tr = &global_trace; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 567 | int i; |
| 568 | /* |
| 569 | * Run a selftest on this tracer. |
| 570 | * Here we reset the trace buffer, and set the current |
| 571 | * tracer to be this tracer. The tracer can then run some |
| 572 | * internal tracing to verify that everything is in order. |
| 573 | * If we fail, we do not register this tracer. |
| 574 | */ |
Ingo Molnar | 86fa2f6 | 2008-11-19 10:00:15 +0100 | [diff] [blame] | 575 | for_each_tracing_cpu(i) |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 576 | tracing_reset(tr, i); |
Ingo Molnar | 86fa2f6 | 2008-11-19 10:00:15 +0100 | [diff] [blame] | 577 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 578 | current_trace = type; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 579 | /* the test is responsible for initializing and enabling */ |
| 580 | pr_info("Testing tracer %s: ", type->name); |
| 581 | ret = type->selftest(type, tr); |
| 582 | /* the test is responsible for resetting too */ |
| 583 | current_trace = saved_tracer; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 584 | if (ret) { |
| 585 | printk(KERN_CONT "FAILED!\n"); |
| 586 | goto out; |
| 587 | } |
Steven Rostedt | 1d4db00 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 588 | /* Only reset on passing, to avoid touching corrupted buffers */ |
Ingo Molnar | 86fa2f6 | 2008-11-19 10:00:15 +0100 | [diff] [blame] | 589 | for_each_tracing_cpu(i) |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 590 | tracing_reset(tr, i); |
Ingo Molnar | 86fa2f6 | 2008-11-19 10:00:15 +0100 | [diff] [blame] | 591 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 592 | printk(KERN_CONT "PASSED\n"); |
| 593 | } |
| 594 | #endif |
| 595 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 596 | type->next = trace_types; |
| 597 | trace_types = type; |
| 598 | len = strlen(type->name); |
| 599 | if (len > max_tracer_type_len) |
| 600 | max_tracer_type_len = len; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 601 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 602 | out: |
| 603 | mutex_unlock(&trace_types_lock); |
Ingo Molnar | 86fa2f6 | 2008-11-19 10:00:15 +0100 | [diff] [blame] | 604 | lock_kernel(); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 605 | |
| 606 | return ret; |
| 607 | } |
| 608 | |
| 609 | void unregister_tracer(struct tracer *type) |
| 610 | { |
| 611 | struct tracer **t; |
| 612 | int len; |
| 613 | |
| 614 | mutex_lock(&trace_types_lock); |
| 615 | for (t = &trace_types; *t; t = &(*t)->next) { |
| 616 | if (*t == type) |
| 617 | goto found; |
| 618 | } |
| 619 | pr_info("Trace %s not registered\n", type->name); |
| 620 | goto out; |
| 621 | |
| 622 | found: |
| 623 | *t = (*t)->next; |
| 624 | if (strlen(type->name) != max_tracer_type_len) |
| 625 | goto out; |
| 626 | |
| 627 | max_tracer_type_len = 0; |
| 628 | for (t = &trace_types; *t; t = &(*t)->next) { |
| 629 | len = strlen((*t)->name); |
| 630 | if (len > max_tracer_type_len) |
| 631 | max_tracer_type_len = len; |
| 632 | } |
| 633 | out: |
| 634 | mutex_unlock(&trace_types_lock); |
| 635 | } |
| 636 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 637 | void tracing_reset(struct trace_array *tr, int cpu) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 638 | { |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 639 | ftrace_disable_cpu(); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 640 | ring_buffer_reset_cpu(tr->buffer, cpu); |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 641 | ftrace_enable_cpu(); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 642 | } |
| 643 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 644 | #define SAVED_CMDLINES 128 |
| 645 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; |
| 646 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; |
| 647 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; |
| 648 | static int cmdline_idx; |
| 649 | static DEFINE_SPINLOCK(trace_cmdline_lock); |
Steven Rostedt | 25b0b44 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 650 | |
Steven Rostedt | 25b0b44 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 651 | /* temporary disable recording */ |
| 652 | atomic_t trace_record_cmdline_disabled __read_mostly; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 653 | |
| 654 | static void trace_init_cmdlines(void) |
| 655 | { |
| 656 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); |
| 657 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); |
| 658 | cmdline_idx = 0; |
| 659 | } |
| 660 | |
Steven Rostedt | 0f04870 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 661 | static int trace_stop_count; |
| 662 | static DEFINE_SPINLOCK(tracing_start_lock); |
| 663 | |
| 664 | /** |
| 665 | * tracing_start - quick start of the tracer |
| 666 | * |
| 667 | * If tracing is enabled but was stopped by tracing_stop, |
| 668 | * this will start the tracer back up. |
| 669 | */ |
| 670 | void tracing_start(void) |
| 671 | { |
| 672 | struct ring_buffer *buffer; |
| 673 | unsigned long flags; |
| 674 | |
| 675 | if (tracing_disabled) |
| 676 | return; |
| 677 | |
| 678 | spin_lock_irqsave(&tracing_start_lock, flags); |
| 679 | if (--trace_stop_count) |
| 680 | goto out; |
| 681 | |
| 682 | if (trace_stop_count < 0) { |
| 683 | /* Someone screwed up their debugging */ |
| 684 | WARN_ON_ONCE(1); |
| 685 | trace_stop_count = 0; |
| 686 | goto out; |
| 687 | } |
| 688 | |
| 689 | |
| 690 | buffer = global_trace.buffer; |
| 691 | if (buffer) |
| 692 | ring_buffer_record_enable(buffer); |
| 693 | |
| 694 | buffer = max_tr.buffer; |
| 695 | if (buffer) |
| 696 | ring_buffer_record_enable(buffer); |
| 697 | |
| 698 | ftrace_start(); |
| 699 | out: |
| 700 | spin_unlock_irqrestore(&tracing_start_lock, flags); |
| 701 | } |
| 702 | |
| 703 | /** |
| 704 | * tracing_stop - quick stop of the tracer |
| 705 | * |
| 706 | * Light weight way to stop tracing. Use in conjunction with |
| 707 | * tracing_start. |
| 708 | */ |
| 709 | void tracing_stop(void) |
| 710 | { |
| 711 | struct ring_buffer *buffer; |
| 712 | unsigned long flags; |
| 713 | |
| 714 | ftrace_stop(); |
| 715 | spin_lock_irqsave(&tracing_start_lock, flags); |
| 716 | if (trace_stop_count++) |
| 717 | goto out; |
| 718 | |
| 719 | buffer = global_trace.buffer; |
| 720 | if (buffer) |
| 721 | ring_buffer_record_disable(buffer); |
| 722 | |
| 723 | buffer = max_tr.buffer; |
| 724 | if (buffer) |
| 725 | ring_buffer_record_disable(buffer); |
| 726 | |
| 727 | out: |
| 728 | spin_unlock_irqrestore(&tracing_start_lock, flags); |
| 729 | } |
| 730 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 731 | void trace_stop_cmdline_recording(void); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 732 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 733 | static void trace_save_cmdline(struct task_struct *tsk) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 734 | { |
| 735 | unsigned map; |
| 736 | unsigned idx; |
| 737 | |
| 738 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) |
| 739 | return; |
| 740 | |
| 741 | /* |
| 742 | * It's not the end of the world if we don't get |
| 743 | * the lock, but we also don't want to spin |
| 744 | * nor do we want to disable interrupts, |
| 745 | * so if we miss here, then better luck next time. |
| 746 | */ |
| 747 | if (!spin_trylock(&trace_cmdline_lock)) |
| 748 | return; |
| 749 | |
| 750 | idx = map_pid_to_cmdline[tsk->pid]; |
| 751 | if (idx >= SAVED_CMDLINES) { |
| 752 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; |
| 753 | |
| 754 | map = map_cmdline_to_pid[idx]; |
| 755 | if (map <= PID_MAX_DEFAULT) |
| 756 | map_pid_to_cmdline[map] = (unsigned)-1; |
| 757 | |
| 758 | map_pid_to_cmdline[tsk->pid] = idx; |
| 759 | |
| 760 | cmdline_idx = idx; |
| 761 | } |
| 762 | |
| 763 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); |
| 764 | |
| 765 | spin_unlock(&trace_cmdline_lock); |
| 766 | } |
| 767 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 768 | static char *trace_find_cmdline(int pid) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 769 | { |
| 770 | char *cmdline = "<...>"; |
| 771 | unsigned map; |
| 772 | |
| 773 | if (!pid) |
| 774 | return "<idle>"; |
| 775 | |
| 776 | if (pid > PID_MAX_DEFAULT) |
| 777 | goto out; |
| 778 | |
| 779 | map = map_pid_to_cmdline[pid]; |
| 780 | if (map >= SAVED_CMDLINES) |
| 781 | goto out; |
| 782 | |
| 783 | cmdline = saved_cmdlines[map]; |
| 784 | |
| 785 | out: |
| 786 | return cmdline; |
| 787 | } |
| 788 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 789 | void tracing_record_cmdline(struct task_struct *tsk) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 790 | { |
| 791 | if (atomic_read(&trace_record_cmdline_disabled)) |
| 792 | return; |
| 793 | |
| 794 | trace_save_cmdline(tsk); |
| 795 | } |
| 796 | |
Pekka Paalanen | 45dcd8b | 2008-09-16 21:56:41 +0300 | [diff] [blame] | 797 | void |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 798 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags, |
| 799 | int pc) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 800 | { |
| 801 | struct task_struct *tsk = current; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 802 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 803 | entry->preempt_count = pc & 0xff; |
| 804 | entry->pid = (tsk) ? tsk->pid : 0; |
| 805 | entry->flags = |
Steven Rostedt | 9244489 | 2008-10-24 09:42:59 -0400 | [diff] [blame] | 806 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 807 | (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
Steven Rostedt | 9244489 | 2008-10-24 09:42:59 -0400 | [diff] [blame] | 808 | #else |
| 809 | TRACE_FLAG_IRQS_NOSUPPORT | |
| 810 | #endif |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 811 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
| 812 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | |
| 813 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); |
| 814 | } |
| 815 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 816 | void |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 817 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 818 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
| 819 | int pc) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 820 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 821 | struct ring_buffer_event *event; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 822 | struct ftrace_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 823 | unsigned long irq_flags; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 824 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 825 | /* If we are reading the ring buffer, don't trace */ |
| 826 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) |
| 827 | return; |
| 828 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 829 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
| 830 | &irq_flags); |
| 831 | if (!event) |
| 832 | return; |
| 833 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 834 | tracing_generic_entry_update(&entry->ent, flags, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 835 | entry->ent.type = TRACE_FN; |
| 836 | entry->ip = ip; |
| 837 | entry->parent_ip = parent_ip; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 838 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 839 | } |
| 840 | |
Frederic Weisbecker | 15e6cb3 | 2008-11-11 07:14:25 +0100 | [diff] [blame] | 841 | #ifdef CONFIG_FUNCTION_RET_TRACER |
| 842 | static void __trace_function_return(struct trace_array *tr, |
| 843 | struct trace_array_cpu *data, |
| 844 | struct ftrace_retfunc *trace, |
| 845 | unsigned long flags, |
| 846 | int pc) |
| 847 | { |
| 848 | struct ring_buffer_event *event; |
| 849 | struct ftrace_ret_entry *entry; |
| 850 | unsigned long irq_flags; |
| 851 | |
| 852 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) |
| 853 | return; |
| 854 | |
| 855 | event = ring_buffer_lock_reserve(global_trace.buffer, sizeof(*entry), |
| 856 | &irq_flags); |
| 857 | if (!event) |
| 858 | return; |
| 859 | entry = ring_buffer_event_data(event); |
| 860 | tracing_generic_entry_update(&entry->ent, flags, pc); |
| 861 | entry->ent.type = TRACE_FN_RET; |
| 862 | entry->ip = trace->func; |
| 863 | entry->parent_ip = trace->ret; |
| 864 | entry->rettime = trace->rettime; |
| 865 | entry->calltime = trace->calltime; |
Frederic Weisbecker | 0231022 | 2008-11-17 03:22:41 +0100 | [diff] [blame] | 866 | entry->overrun = trace->overrun; |
Frederic Weisbecker | 15e6cb3 | 2008-11-11 07:14:25 +0100 | [diff] [blame] | 867 | ring_buffer_unlock_commit(global_trace.buffer, event, irq_flags); |
| 868 | } |
| 869 | #endif |
| 870 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 871 | void |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 872 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 873 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
| 874 | int pc) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 875 | { |
| 876 | if (likely(!atomic_read(&data->disabled))) |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 877 | trace_function(tr, data, ip, parent_ip, flags, pc); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 878 | } |
| 879 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 880 | static void ftrace_trace_stack(struct trace_array *tr, |
| 881 | struct trace_array_cpu *data, |
| 882 | unsigned long flags, |
| 883 | int skip, int pc) |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 884 | { |
Al Viro | c2c8052 | 2008-10-31 19:50:41 +0000 | [diff] [blame] | 885 | #ifdef CONFIG_STACKTRACE |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 886 | struct ring_buffer_event *event; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 887 | struct stack_entry *entry; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 888 | struct stack_trace trace; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 889 | unsigned long irq_flags; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 890 | |
| 891 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) |
| 892 | return; |
| 893 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 894 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
| 895 | &irq_flags); |
| 896 | if (!event) |
| 897 | return; |
| 898 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 899 | tracing_generic_entry_update(&entry->ent, flags, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 900 | entry->ent.type = TRACE_STACK; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 901 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 902 | memset(&entry->caller, 0, sizeof(entry->caller)); |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 903 | |
| 904 | trace.nr_entries = 0; |
| 905 | trace.max_entries = FTRACE_STACK_ENTRIES; |
| 906 | trace.skip = skip; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 907 | trace.entries = entry->caller; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 908 | |
| 909 | save_stack_trace(&trace); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 910 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Al Viro | c2c8052 | 2008-10-31 19:50:41 +0000 | [diff] [blame] | 911 | #endif |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 912 | } |
| 913 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 914 | void __trace_stack(struct trace_array *tr, |
| 915 | struct trace_array_cpu *data, |
| 916 | unsigned long flags, |
| 917 | int skip) |
| 918 | { |
| 919 | ftrace_trace_stack(tr, data, flags, skip, preempt_count()); |
| 920 | } |
| 921 | |
Török Edwin | 02b6751 | 2008-11-22 13:28:47 +0200 | [diff] [blame^] | 922 | static void ftrace_trace_userstack(struct trace_array *tr, |
| 923 | struct trace_array_cpu *data, |
| 924 | unsigned long flags, int pc) |
| 925 | { |
| 926 | struct userstack_entry *entry; |
| 927 | struct stack_trace trace; |
| 928 | struct ring_buffer_event *event; |
| 929 | unsigned long irq_flags; |
| 930 | |
| 931 | if (!(trace_flags & TRACE_ITER_USERSTACKTRACE)) |
| 932 | return; |
| 933 | |
| 934 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
| 935 | &irq_flags); |
| 936 | if (!event) |
| 937 | return; |
| 938 | entry = ring_buffer_event_data(event); |
| 939 | tracing_generic_entry_update(&entry->ent, flags, pc); |
| 940 | entry->ent.type = TRACE_USER_STACK; |
| 941 | |
| 942 | memset(&entry->caller, 0, sizeof(entry->caller)); |
| 943 | |
| 944 | trace.nr_entries = 0; |
| 945 | trace.max_entries = FTRACE_STACK_ENTRIES; |
| 946 | trace.skip = 0; |
| 947 | trace.entries = entry->caller; |
| 948 | |
| 949 | save_stack_trace_user(&trace); |
| 950 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
| 951 | } |
| 952 | |
| 953 | void __trace_userstack(struct trace_array *tr, |
| 954 | struct trace_array_cpu *data, |
| 955 | unsigned long flags) |
| 956 | { |
| 957 | ftrace_trace_userstack(tr, data, flags, preempt_count()); |
| 958 | } |
| 959 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 960 | static void |
| 961 | ftrace_trace_special(void *__tr, void *__data, |
| 962 | unsigned long arg1, unsigned long arg2, unsigned long arg3, |
| 963 | int pc) |
Ingo Molnar | a4feb834 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 964 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 965 | struct ring_buffer_event *event; |
Ingo Molnar | a4feb834 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 966 | struct trace_array_cpu *data = __data; |
| 967 | struct trace_array *tr = __tr; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 968 | struct special_entry *entry; |
Ingo Molnar | a4feb834 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 969 | unsigned long irq_flags; |
| 970 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 971 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
| 972 | &irq_flags); |
| 973 | if (!event) |
| 974 | return; |
| 975 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 976 | tracing_generic_entry_update(&entry->ent, 0, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 977 | entry->ent.type = TRACE_SPECIAL; |
| 978 | entry->arg1 = arg1; |
| 979 | entry->arg2 = arg2; |
| 980 | entry->arg3 = arg3; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 981 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 982 | ftrace_trace_stack(tr, data, irq_flags, 4, pc); |
Török Edwin | 02b6751 | 2008-11-22 13:28:47 +0200 | [diff] [blame^] | 983 | ftrace_trace_userstack(tr, data, irq_flags, pc); |
Ingo Molnar | a4feb834 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 984 | |
| 985 | trace_wake_up(); |
| 986 | } |
| 987 | |
| 988 | void |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 989 | __trace_special(void *__tr, void *__data, |
| 990 | unsigned long arg1, unsigned long arg2, unsigned long arg3) |
| 991 | { |
| 992 | ftrace_trace_special(__tr, __data, arg1, arg2, arg3, preempt_count()); |
| 993 | } |
| 994 | |
| 995 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 996 | tracing_sched_switch_trace(struct trace_array *tr, |
| 997 | struct trace_array_cpu *data, |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 998 | struct task_struct *prev, |
| 999 | struct task_struct *next, |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 1000 | unsigned long flags, int pc) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1001 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1002 | struct ring_buffer_event *event; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1003 | struct ctx_switch_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 1004 | unsigned long irq_flags; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1005 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1006 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
| 1007 | &irq_flags); |
| 1008 | if (!event) |
| 1009 | return; |
| 1010 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 1011 | tracing_generic_entry_update(&entry->ent, flags, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1012 | entry->ent.type = TRACE_CTX; |
| 1013 | entry->prev_pid = prev->pid; |
| 1014 | entry->prev_prio = prev->prio; |
| 1015 | entry->prev_state = prev->state; |
| 1016 | entry->next_pid = next->pid; |
| 1017 | entry->next_prio = next->prio; |
| 1018 | entry->next_state = next->state; |
| 1019 | entry->next_cpu = task_cpu(next); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1020 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 1021 | ftrace_trace_stack(tr, data, flags, 5, pc); |
Török Edwin | 02b6751 | 2008-11-22 13:28:47 +0200 | [diff] [blame^] | 1022 | ftrace_trace_userstack(tr, data, flags, pc); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1023 | } |
| 1024 | |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1025 | void |
| 1026 | tracing_sched_wakeup_trace(struct trace_array *tr, |
| 1027 | struct trace_array_cpu *data, |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1028 | struct task_struct *wakee, |
| 1029 | struct task_struct *curr, |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 1030 | unsigned long flags, int pc) |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1031 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1032 | struct ring_buffer_event *event; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1033 | struct ctx_switch_entry *entry; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1034 | unsigned long irq_flags; |
| 1035 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1036 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
| 1037 | &irq_flags); |
| 1038 | if (!event) |
| 1039 | return; |
| 1040 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 1041 | tracing_generic_entry_update(&entry->ent, flags, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1042 | entry->ent.type = TRACE_WAKE; |
| 1043 | entry->prev_pid = curr->pid; |
| 1044 | entry->prev_prio = curr->prio; |
| 1045 | entry->prev_state = curr->state; |
| 1046 | entry->next_pid = wakee->pid; |
| 1047 | entry->next_prio = wakee->prio; |
| 1048 | entry->next_state = wakee->state; |
| 1049 | entry->next_cpu = task_cpu(wakee); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1050 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 1051 | ftrace_trace_stack(tr, data, flags, 6, pc); |
Török Edwin | 02b6751 | 2008-11-22 13:28:47 +0200 | [diff] [blame^] | 1052 | ftrace_trace_userstack(tr, data, flags, pc); |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1053 | |
| 1054 | trace_wake_up(); |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1055 | } |
| 1056 | |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 1057 | void |
| 1058 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) |
| 1059 | { |
| 1060 | struct trace_array *tr = &global_trace; |
| 1061 | struct trace_array_cpu *data; |
Steven Rostedt | 5aa1ba6 | 2008-11-10 23:07:30 -0500 | [diff] [blame] | 1062 | unsigned long flags; |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 1063 | int cpu; |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 1064 | int pc; |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 1065 | |
Steven Rostedt | c76f069 | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 1066 | if (tracing_disabled) |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 1067 | return; |
| 1068 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 1069 | pc = preempt_count(); |
Steven Rostedt | 5aa1ba6 | 2008-11-10 23:07:30 -0500 | [diff] [blame] | 1070 | local_irq_save(flags); |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 1071 | cpu = raw_smp_processor_id(); |
| 1072 | data = tr->data[cpu]; |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 1073 | |
Steven Rostedt | 5aa1ba6 | 2008-11-10 23:07:30 -0500 | [diff] [blame] | 1074 | if (likely(atomic_inc_return(&data->disabled) == 1)) |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 1075 | ftrace_trace_special(tr, data, arg1, arg2, arg3, pc); |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 1076 | |
Steven Rostedt | 5aa1ba6 | 2008-11-10 23:07:30 -0500 | [diff] [blame] | 1077 | atomic_dec(&data->disabled); |
| 1078 | local_irq_restore(flags); |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 1079 | } |
| 1080 | |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 1081 | #ifdef CONFIG_FUNCTION_TRACER |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1082 | static void |
Steven Rostedt | b2a866f | 2008-11-03 23:15:57 -0500 | [diff] [blame] | 1083 | function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1084 | { |
| 1085 | struct trace_array *tr = &global_trace; |
| 1086 | struct trace_array_cpu *data; |
| 1087 | unsigned long flags; |
| 1088 | long disabled; |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 1089 | int cpu, resched; |
| 1090 | int pc; |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1091 | |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 1092 | if (unlikely(!ftrace_function_enabled)) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1093 | return; |
| 1094 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 1095 | pc = preempt_count(); |
Steven Rostedt | 182e9f5 | 2008-11-03 23:15:56 -0500 | [diff] [blame] | 1096 | resched = ftrace_preempt_disable(); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 1097 | local_save_flags(flags); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1098 | cpu = raw_smp_processor_id(); |
| 1099 | data = tr->data[cpu]; |
| 1100 | disabled = atomic_inc_return(&data->disabled); |
| 1101 | |
| 1102 | if (likely(disabled == 1)) |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 1103 | trace_function(tr, data, ip, parent_ip, flags, pc); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1104 | |
| 1105 | atomic_dec(&data->disabled); |
Steven Rostedt | 182e9f5 | 2008-11-03 23:15:56 -0500 | [diff] [blame] | 1106 | ftrace_preempt_enable(resched); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1107 | } |
| 1108 | |
Steven Rostedt | b2a866f | 2008-11-03 23:15:57 -0500 | [diff] [blame] | 1109 | static void |
| 1110 | function_trace_call(unsigned long ip, unsigned long parent_ip) |
| 1111 | { |
| 1112 | struct trace_array *tr = &global_trace; |
| 1113 | struct trace_array_cpu *data; |
| 1114 | unsigned long flags; |
| 1115 | long disabled; |
| 1116 | int cpu; |
| 1117 | int pc; |
| 1118 | |
| 1119 | if (unlikely(!ftrace_function_enabled)) |
| 1120 | return; |
| 1121 | |
| 1122 | /* |
| 1123 | * Need to use raw, since this must be called before the |
| 1124 | * recursive protection is performed. |
| 1125 | */ |
Steven Rostedt | d51ad7a | 2008-11-15 15:48:29 -0500 | [diff] [blame] | 1126 | local_irq_save(flags); |
Steven Rostedt | b2a866f | 2008-11-03 23:15:57 -0500 | [diff] [blame] | 1127 | cpu = raw_smp_processor_id(); |
| 1128 | data = tr->data[cpu]; |
| 1129 | disabled = atomic_inc_return(&data->disabled); |
| 1130 | |
| 1131 | if (likely(disabled == 1)) { |
| 1132 | pc = preempt_count(); |
| 1133 | trace_function(tr, data, ip, parent_ip, flags, pc); |
| 1134 | } |
| 1135 | |
| 1136 | atomic_dec(&data->disabled); |
Steven Rostedt | d51ad7a | 2008-11-15 15:48:29 -0500 | [diff] [blame] | 1137 | local_irq_restore(flags); |
Steven Rostedt | b2a866f | 2008-11-03 23:15:57 -0500 | [diff] [blame] | 1138 | } |
| 1139 | |
Frederic Weisbecker | 15e6cb3 | 2008-11-11 07:14:25 +0100 | [diff] [blame] | 1140 | #ifdef CONFIG_FUNCTION_RET_TRACER |
| 1141 | void trace_function_return(struct ftrace_retfunc *trace) |
| 1142 | { |
| 1143 | struct trace_array *tr = &global_trace; |
| 1144 | struct trace_array_cpu *data; |
| 1145 | unsigned long flags; |
| 1146 | long disabled; |
| 1147 | int cpu; |
| 1148 | int pc; |
| 1149 | |
| 1150 | raw_local_irq_save(flags); |
| 1151 | cpu = raw_smp_processor_id(); |
| 1152 | data = tr->data[cpu]; |
| 1153 | disabled = atomic_inc_return(&data->disabled); |
| 1154 | if (likely(disabled == 1)) { |
| 1155 | pc = preempt_count(); |
| 1156 | __trace_function_return(tr, data, trace, flags, pc); |
| 1157 | } |
| 1158 | atomic_dec(&data->disabled); |
| 1159 | raw_local_irq_restore(flags); |
| 1160 | } |
| 1161 | #endif /* CONFIG_FUNCTION_RET_TRACER */ |
| 1162 | |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1163 | static struct ftrace_ops trace_ops __read_mostly = |
| 1164 | { |
| 1165 | .func = function_trace_call, |
| 1166 | }; |
| 1167 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1168 | void tracing_start_function_trace(void) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1169 | { |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 1170 | ftrace_function_enabled = 0; |
Steven Rostedt | b2a866f | 2008-11-03 23:15:57 -0500 | [diff] [blame] | 1171 | |
| 1172 | if (trace_flags & TRACE_ITER_PREEMPTONLY) |
| 1173 | trace_ops.func = function_trace_call_preempt_only; |
| 1174 | else |
| 1175 | trace_ops.func = function_trace_call; |
| 1176 | |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1177 | register_ftrace_function(&trace_ops); |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 1178 | ftrace_function_enabled = 1; |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1179 | } |
| 1180 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1181 | void tracing_stop_function_trace(void) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1182 | { |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 1183 | ftrace_function_enabled = 0; |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1184 | unregister_ftrace_function(&trace_ops); |
| 1185 | } |
| 1186 | #endif |
| 1187 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1188 | enum trace_file_type { |
| 1189 | TRACE_FILE_LAT_FMT = 1, |
Steven Rostedt | 12ef7d4 | 2008-11-12 17:52:38 -0500 | [diff] [blame] | 1190 | TRACE_FILE_ANNOTATE = 2, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1191 | }; |
| 1192 | |
Steven Rostedt | 5a90f57 | 2008-09-03 17:42:51 -0400 | [diff] [blame] | 1193 | static void trace_iterator_increment(struct trace_iterator *iter, int cpu) |
| 1194 | { |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1195 | /* Don't allow ftrace to trace into the ring buffers */ |
| 1196 | ftrace_disable_cpu(); |
| 1197 | |
Steven Rostedt | 5a90f57 | 2008-09-03 17:42:51 -0400 | [diff] [blame] | 1198 | iter->idx++; |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1199 | if (iter->buffer_iter[iter->cpu]) |
| 1200 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); |
| 1201 | |
| 1202 | ftrace_enable_cpu(); |
Steven Rostedt | 5a90f57 | 2008-09-03 17:42:51 -0400 | [diff] [blame] | 1203 | } |
| 1204 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1205 | static struct trace_entry * |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1206 | peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1207 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1208 | struct ring_buffer_event *event; |
| 1209 | struct ring_buffer_iter *buf_iter = iter->buffer_iter[cpu]; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1210 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1211 | /* Don't allow ftrace to trace into the ring buffers */ |
| 1212 | ftrace_disable_cpu(); |
| 1213 | |
| 1214 | if (buf_iter) |
| 1215 | event = ring_buffer_iter_peek(buf_iter, ts); |
| 1216 | else |
| 1217 | event = ring_buffer_peek(iter->tr->buffer, cpu, ts); |
| 1218 | |
| 1219 | ftrace_enable_cpu(); |
| 1220 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1221 | return event ? ring_buffer_event_data(event) : NULL; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1222 | } |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1223 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1224 | static struct trace_entry * |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1225 | __find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1226 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1227 | struct ring_buffer *buffer = iter->tr->buffer; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1228 | struct trace_entry *ent, *next = NULL; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1229 | u64 next_ts = 0, ts; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1230 | int next_cpu = -1; |
| 1231 | int cpu; |
| 1232 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1233 | for_each_tracing_cpu(cpu) { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1234 | |
| 1235 | if (ring_buffer_empty_cpu(buffer, cpu)) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1236 | continue; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1237 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1238 | ent = peek_next_entry(iter, cpu, &ts); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1239 | |
Ingo Molnar | cdd31cd | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1240 | /* |
| 1241 | * Pick the entry with the smallest timestamp: |
| 1242 | */ |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1243 | if (ent && (!next || ts < next_ts)) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1244 | next = ent; |
| 1245 | next_cpu = cpu; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1246 | next_ts = ts; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1247 | } |
| 1248 | } |
| 1249 | |
| 1250 | if (ent_cpu) |
| 1251 | *ent_cpu = next_cpu; |
| 1252 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1253 | if (ent_ts) |
| 1254 | *ent_ts = next_ts; |
| 1255 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1256 | return next; |
| 1257 | } |
| 1258 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1259 | /* Find the next real entry, without updating the iterator itself */ |
| 1260 | static struct trace_entry * |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1261 | find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1262 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1263 | return __find_next_entry(iter, ent_cpu, ent_ts); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1264 | } |
Ingo Molnar | 8c523a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1265 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1266 | /* Find the next real entry, and increment the iterator to the next entry */ |
| 1267 | static void *find_next_entry_inc(struct trace_iterator *iter) |
| 1268 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1269 | iter->ent = __find_next_entry(iter, &iter->cpu, &iter->ts); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1270 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1271 | if (iter->ent) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1272 | trace_iterator_increment(iter, iter->cpu); |
| 1273 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1274 | return iter->ent ? iter : NULL; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1275 | } |
| 1276 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1277 | static void trace_consume(struct trace_iterator *iter) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1278 | { |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1279 | /* Don't allow ftrace to trace into the ring buffers */ |
| 1280 | ftrace_disable_cpu(); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1281 | ring_buffer_consume(iter->tr->buffer, iter->cpu, &iter->ts); |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1282 | ftrace_enable_cpu(); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1283 | } |
| 1284 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1285 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1286 | { |
| 1287 | struct trace_iterator *iter = m->private; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1288 | int i = (int)*pos; |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1289 | void *ent; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1290 | |
| 1291 | (*pos)++; |
| 1292 | |
| 1293 | /* can't go backwards */ |
| 1294 | if (iter->idx > i) |
| 1295 | return NULL; |
| 1296 | |
| 1297 | if (iter->idx < 0) |
| 1298 | ent = find_next_entry_inc(iter); |
| 1299 | else |
| 1300 | ent = iter; |
| 1301 | |
| 1302 | while (ent && iter->idx < i) |
| 1303 | ent = find_next_entry_inc(iter); |
| 1304 | |
| 1305 | iter->pos = *pos; |
| 1306 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1307 | return ent; |
| 1308 | } |
| 1309 | |
| 1310 | static void *s_start(struct seq_file *m, loff_t *pos) |
| 1311 | { |
| 1312 | struct trace_iterator *iter = m->private; |
| 1313 | void *p = NULL; |
| 1314 | loff_t l = 0; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1315 | int cpu; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1316 | |
| 1317 | mutex_lock(&trace_types_lock); |
| 1318 | |
Steven Rostedt | d15f57f | 2008-05-12 21:20:56 +0200 | [diff] [blame] | 1319 | if (!current_trace || current_trace != iter->trace) { |
| 1320 | mutex_unlock(&trace_types_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1321 | return NULL; |
Steven Rostedt | d15f57f | 2008-05-12 21:20:56 +0200 | [diff] [blame] | 1322 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1323 | |
| 1324 | atomic_inc(&trace_record_cmdline_disabled); |
| 1325 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1326 | if (*pos != iter->pos) { |
| 1327 | iter->ent = NULL; |
| 1328 | iter->cpu = 0; |
| 1329 | iter->idx = -1; |
| 1330 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1331 | ftrace_disable_cpu(); |
| 1332 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1333 | for_each_tracing_cpu(cpu) { |
| 1334 | ring_buffer_iter_reset(iter->buffer_iter[cpu]); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1335 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1336 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1337 | ftrace_enable_cpu(); |
| 1338 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1339 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
| 1340 | ; |
| 1341 | |
| 1342 | } else { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1343 | l = *pos - 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1344 | p = s_next(m, p, &l); |
| 1345 | } |
| 1346 | |
| 1347 | return p; |
| 1348 | } |
| 1349 | |
| 1350 | static void s_stop(struct seq_file *m, void *p) |
| 1351 | { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1352 | atomic_dec(&trace_record_cmdline_disabled); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1353 | mutex_unlock(&trace_types_lock); |
| 1354 | } |
| 1355 | |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 1356 | #ifdef CONFIG_KRETPROBES |
Steven Rostedt | b3aa557 | 2008-10-31 15:44:07 -0400 | [diff] [blame] | 1357 | static inline const char *kretprobed(const char *name) |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 1358 | { |
Steven Rostedt | b3aa557 | 2008-10-31 15:44:07 -0400 | [diff] [blame] | 1359 | static const char tramp_name[] = "kretprobe_trampoline"; |
| 1360 | int size = sizeof(tramp_name); |
| 1361 | |
| 1362 | if (strncmp(tramp_name, name, size) == 0) |
| 1363 | return "[unknown/kretprobe'd]"; |
| 1364 | return name; |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 1365 | } |
| 1366 | #else |
Steven Rostedt | b3aa557 | 2008-10-31 15:44:07 -0400 | [diff] [blame] | 1367 | static inline const char *kretprobed(const char *name) |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 1368 | { |
Steven Rostedt | b3aa557 | 2008-10-31 15:44:07 -0400 | [diff] [blame] | 1369 | return name; |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 1370 | } |
| 1371 | #endif /* CONFIG_KRETPROBES */ |
| 1372 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1373 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1374 | seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1375 | { |
| 1376 | #ifdef CONFIG_KALLSYMS |
| 1377 | char str[KSYM_SYMBOL_LEN]; |
Steven Rostedt | b3aa557 | 2008-10-31 15:44:07 -0400 | [diff] [blame] | 1378 | const char *name; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1379 | |
| 1380 | kallsyms_lookup(address, NULL, NULL, NULL, str); |
| 1381 | |
Steven Rostedt | b3aa557 | 2008-10-31 15:44:07 -0400 | [diff] [blame] | 1382 | name = kretprobed(str); |
| 1383 | |
| 1384 | return trace_seq_printf(s, fmt, name); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1385 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1386 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1387 | } |
| 1388 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1389 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1390 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
| 1391 | unsigned long address) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1392 | { |
| 1393 | #ifdef CONFIG_KALLSYMS |
| 1394 | char str[KSYM_SYMBOL_LEN]; |
Steven Rostedt | b3aa557 | 2008-10-31 15:44:07 -0400 | [diff] [blame] | 1395 | const char *name; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1396 | |
| 1397 | sprint_symbol(str, address); |
Steven Rostedt | b3aa557 | 2008-10-31 15:44:07 -0400 | [diff] [blame] | 1398 | name = kretprobed(str); |
| 1399 | |
| 1400 | return trace_seq_printf(s, fmt, name); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1401 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1402 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1403 | } |
| 1404 | |
| 1405 | #ifndef CONFIG_64BIT |
| 1406 | # define IP_FMT "%08lx" |
| 1407 | #else |
| 1408 | # define IP_FMT "%016lx" |
| 1409 | #endif |
| 1410 | |
Frederic Weisbecker | 15e6cb3 | 2008-11-11 07:14:25 +0100 | [diff] [blame] | 1411 | int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1412 | seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1413 | { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1414 | int ret; |
| 1415 | |
| 1416 | if (!ip) |
| 1417 | return trace_seq_printf(s, "0"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1418 | |
| 1419 | if (sym_flags & TRACE_ITER_SYM_OFFSET) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1420 | ret = seq_print_sym_offset(s, "%s", ip); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1421 | else |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1422 | ret = seq_print_sym_short(s, "%s", ip); |
| 1423 | |
| 1424 | if (!ret) |
| 1425 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1426 | |
| 1427 | if (sym_flags & TRACE_ITER_SYM_ADDR) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1428 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
| 1429 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1430 | } |
| 1431 | |
Török Edwin | 02b6751 | 2008-11-22 13:28:47 +0200 | [diff] [blame^] | 1432 | static int |
| 1433 | seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s, |
| 1434 | unsigned long sym_flags) |
| 1435 | { |
| 1436 | int ret = 1; |
| 1437 | unsigned i; |
| 1438 | |
| 1439 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
| 1440 | unsigned long ip = entry->caller[i]; |
| 1441 | |
| 1442 | if (ip == ULONG_MAX || !ret) |
| 1443 | break; |
| 1444 | if (i) |
| 1445 | ret = trace_seq_puts(s, " <- "); |
| 1446 | if (!ip) { |
| 1447 | ret = trace_seq_puts(s, "??"); |
| 1448 | continue; |
| 1449 | } |
| 1450 | if (ret /*&& (sym_flags & TRACE_ITER_SYM_ADDR)*/) |
| 1451 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
| 1452 | } |
| 1453 | |
| 1454 | return ret; |
| 1455 | } |
| 1456 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1457 | static void print_lat_help_header(struct seq_file *m) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1458 | { |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1459 | seq_puts(m, "# _------=> CPU# \n"); |
| 1460 | seq_puts(m, "# / _-----=> irqs-off \n"); |
| 1461 | seq_puts(m, "# | / _----=> need-resched \n"); |
| 1462 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); |
| 1463 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); |
| 1464 | seq_puts(m, "# |||| / \n"); |
| 1465 | seq_puts(m, "# ||||| delay \n"); |
| 1466 | seq_puts(m, "# cmd pid ||||| time | caller \n"); |
| 1467 | seq_puts(m, "# \\ / ||||| \\ | / \n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1468 | } |
| 1469 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1470 | static void print_func_help_header(struct seq_file *m) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1471 | { |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1472 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
| 1473 | seq_puts(m, "# | | | | |\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1474 | } |
| 1475 | |
| 1476 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1477 | static void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1478 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
| 1479 | { |
| 1480 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
| 1481 | struct trace_array *tr = iter->tr; |
| 1482 | struct trace_array_cpu *data = tr->data[tr->cpu]; |
| 1483 | struct tracer *type = current_trace; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1484 | unsigned long total; |
| 1485 | unsigned long entries; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1486 | const char *name = "preemption"; |
| 1487 | |
| 1488 | if (type) |
| 1489 | name = type->name; |
| 1490 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1491 | entries = ring_buffer_entries(iter->tr->buffer); |
| 1492 | total = entries + |
| 1493 | ring_buffer_overruns(iter->tr->buffer); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1494 | |
| 1495 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", |
| 1496 | name, UTS_RELEASE); |
| 1497 | seq_puts(m, "-----------------------------------" |
| 1498 | "---------------------------------\n"); |
| 1499 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" |
| 1500 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", |
Steven Rostedt | 57f50be | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1501 | nsecs_to_usecs(data->saved_latency), |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1502 | entries, |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1503 | total, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1504 | tr->cpu, |
| 1505 | #if defined(CONFIG_PREEMPT_NONE) |
| 1506 | "server", |
| 1507 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) |
| 1508 | "desktop", |
Steven Rostedt | b5c21b4 | 2008-07-10 20:58:12 -0400 | [diff] [blame] | 1509 | #elif defined(CONFIG_PREEMPT) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1510 | "preempt", |
| 1511 | #else |
| 1512 | "unknown", |
| 1513 | #endif |
| 1514 | /* These are reserved for later use */ |
| 1515 | 0, 0, 0, 0); |
| 1516 | #ifdef CONFIG_SMP |
| 1517 | seq_printf(m, " #P:%d)\n", num_online_cpus()); |
| 1518 | #else |
| 1519 | seq_puts(m, ")\n"); |
| 1520 | #endif |
| 1521 | seq_puts(m, " -----------------\n"); |
| 1522 | seq_printf(m, " | task: %.16s-%d " |
| 1523 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", |
| 1524 | data->comm, data->pid, data->uid, data->nice, |
| 1525 | data->policy, data->rt_priority); |
| 1526 | seq_puts(m, " -----------------\n"); |
| 1527 | |
| 1528 | if (data->critical_start) { |
| 1529 | seq_puts(m, " => started at: "); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1530 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
| 1531 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1532 | seq_puts(m, "\n => ended at: "); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1533 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
| 1534 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1535 | seq_puts(m, "\n"); |
| 1536 | } |
| 1537 | |
| 1538 | seq_puts(m, "\n"); |
| 1539 | } |
| 1540 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1541 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1542 | lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1543 | { |
| 1544 | int hardirq, softirq; |
| 1545 | char *comm; |
| 1546 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1547 | comm = trace_find_cmdline(entry->pid); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1548 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1549 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1550 | trace_seq_printf(s, "%3d", cpu); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1551 | trace_seq_printf(s, "%c%c", |
Steven Rostedt | 9244489 | 2008-10-24 09:42:59 -0400 | [diff] [blame] | 1552 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : |
| 1553 | (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' : '.', |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1554 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1555 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1556 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; |
| 1557 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1558 | if (hardirq && softirq) { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1559 | trace_seq_putc(s, 'H'); |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1560 | } else { |
| 1561 | if (hardirq) { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1562 | trace_seq_putc(s, 'h'); |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1563 | } else { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1564 | if (softirq) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1565 | trace_seq_putc(s, 's'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1566 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1567 | trace_seq_putc(s, '.'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1568 | } |
| 1569 | } |
| 1570 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1571 | if (entry->preempt_count) |
| 1572 | trace_seq_printf(s, "%x", entry->preempt_count); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1573 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1574 | trace_seq_puts(s, "."); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1575 | } |
| 1576 | |
| 1577 | unsigned long preempt_mark_thresh = 100; |
| 1578 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1579 | static void |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1580 | lat_print_timestamp(struct trace_seq *s, u64 abs_usecs, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1581 | unsigned long rel_usecs) |
| 1582 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1583 | trace_seq_printf(s, " %4lldus", abs_usecs); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1584 | if (rel_usecs > preempt_mark_thresh) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1585 | trace_seq_puts(s, "!: "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1586 | else if (rel_usecs > 1) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1587 | trace_seq_puts(s, "+: "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1588 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1589 | trace_seq_puts(s, " : "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1590 | } |
| 1591 | |
| 1592 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; |
| 1593 | |
Pekka Paalanen | fc5e27a | 2008-09-16 22:02:27 +0300 | [diff] [blame] | 1594 | /* |
| 1595 | * The message is supposed to contain an ending newline. |
| 1596 | * If the printing stops prematurely, try to add a newline of our own. |
| 1597 | */ |
| 1598 | void trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1599 | { |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1600 | struct trace_entry *ent; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1601 | struct trace_field_cont *cont; |
Pekka Paalanen | fc5e27a | 2008-09-16 22:02:27 +0300 | [diff] [blame] | 1602 | bool ok = true; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1603 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1604 | ent = peek_next_entry(iter, iter->cpu, NULL); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1605 | if (!ent || ent->type != TRACE_CONT) { |
| 1606 | trace_seq_putc(s, '\n'); |
| 1607 | return; |
| 1608 | } |
| 1609 | |
| 1610 | do { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1611 | cont = (struct trace_field_cont *)ent; |
Pekka Paalanen | fc5e27a | 2008-09-16 22:02:27 +0300 | [diff] [blame] | 1612 | if (ok) |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1613 | ok = (trace_seq_printf(s, "%s", cont->buf) > 0); |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1614 | |
| 1615 | ftrace_disable_cpu(); |
| 1616 | |
| 1617 | if (iter->buffer_iter[iter->cpu]) |
| 1618 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); |
| 1619 | else |
| 1620 | ring_buffer_consume(iter->tr->buffer, iter->cpu, NULL); |
| 1621 | |
| 1622 | ftrace_enable_cpu(); |
| 1623 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1624 | ent = peek_next_entry(iter, iter->cpu, NULL); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1625 | } while (ent && ent->type == TRACE_CONT); |
Pekka Paalanen | fc5e27a | 2008-09-16 22:02:27 +0300 | [diff] [blame] | 1626 | |
| 1627 | if (!ok) |
| 1628 | trace_seq_putc(s, '\n'); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1629 | } |
| 1630 | |
Steven Rostedt | a309720 | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 1631 | static void test_cpu_buff_start(struct trace_iterator *iter) |
| 1632 | { |
| 1633 | struct trace_seq *s = &iter->seq; |
| 1634 | |
Steven Rostedt | 12ef7d4 | 2008-11-12 17:52:38 -0500 | [diff] [blame] | 1635 | if (!(trace_flags & TRACE_ITER_ANNOTATE)) |
| 1636 | return; |
| 1637 | |
| 1638 | if (!(iter->iter_flags & TRACE_FILE_ANNOTATE)) |
| 1639 | return; |
| 1640 | |
Steven Rostedt | a309720 | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 1641 | if (cpu_isset(iter->cpu, iter->started)) |
| 1642 | return; |
| 1643 | |
| 1644 | cpu_set(iter->cpu, iter->started); |
| 1645 | trace_seq_printf(s, "##### CPU %u buffer started ####\n", iter->cpu); |
| 1646 | } |
| 1647 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1648 | static enum print_line_t |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1649 | print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1650 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1651 | struct trace_seq *s = &iter->seq; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1652 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1653 | struct trace_entry *next_entry; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1654 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); |
| 1655 | struct trace_entry *entry = iter->ent; |
| 1656 | unsigned long abs_usecs; |
| 1657 | unsigned long rel_usecs; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1658 | u64 next_ts; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1659 | char *comm; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1660 | int S, T; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1661 | int i; |
Ankita Garg | d17d969 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 1662 | unsigned state; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1663 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1664 | if (entry->type == TRACE_CONT) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1665 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1666 | |
Steven Rostedt | a309720 | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 1667 | test_cpu_buff_start(iter); |
| 1668 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1669 | next_entry = find_next_entry(iter, NULL, &next_ts); |
| 1670 | if (!next_entry) |
| 1671 | next_ts = iter->ts; |
| 1672 | rel_usecs = ns2usecs(next_ts - iter->ts); |
| 1673 | abs_usecs = ns2usecs(iter->ts - iter->tr->time_start); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1674 | |
| 1675 | if (verbose) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1676 | comm = trace_find_cmdline(entry->pid); |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1677 | trace_seq_printf(s, "%16s %5d %3d %d %08x %08x [%08lx]" |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1678 | " %ld.%03ldms (+%ld.%03ldms): ", |
| 1679 | comm, |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1680 | entry->pid, cpu, entry->flags, |
| 1681 | entry->preempt_count, trace_idx, |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1682 | ns2usecs(iter->ts), |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1683 | abs_usecs/1000, |
| 1684 | abs_usecs % 1000, rel_usecs/1000, |
| 1685 | rel_usecs % 1000); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1686 | } else { |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1687 | lat_print_generic(s, entry, cpu); |
| 1688 | lat_print_timestamp(s, abs_usecs, rel_usecs); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1689 | } |
| 1690 | switch (entry->type) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1691 | case TRACE_FN: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1692 | struct ftrace_entry *field; |
| 1693 | |
| 1694 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1695 | |
| 1696 | seq_print_ip_sym(s, field->ip, sym_flags); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1697 | trace_seq_puts(s, " ("); |
Steven Rostedt | b3aa557 | 2008-10-31 15:44:07 -0400 | [diff] [blame] | 1698 | seq_print_ip_sym(s, field->parent_ip, sym_flags); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1699 | trace_seq_puts(s, ")\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1700 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1701 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1702 | case TRACE_CTX: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1703 | case TRACE_WAKE: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1704 | struct ctx_switch_entry *field; |
| 1705 | |
| 1706 | trace_assign_type(field, entry); |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1707 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1708 | T = field->next_state < sizeof(state_to_char) ? |
| 1709 | state_to_char[field->next_state] : 'X'; |
| 1710 | |
| 1711 | state = field->prev_state ? |
| 1712 | __ffs(field->prev_state) + 1 : 0; |
Ankita Garg | d17d969 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 1713 | S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X'; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1714 | comm = trace_find_cmdline(field->next_pid); |
Peter Zijlstra | 80b5e94 | 2008-09-04 10:24:16 +0200 | [diff] [blame] | 1715 | trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1716 | field->prev_pid, |
| 1717 | field->prev_prio, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1718 | S, entry->type == TRACE_CTX ? "==>" : " +", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1719 | field->next_cpu, |
| 1720 | field->next_pid, |
| 1721 | field->next_prio, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1722 | T, comm); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1723 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1724 | } |
| 1725 | case TRACE_SPECIAL: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1726 | struct special_entry *field; |
| 1727 | |
| 1728 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1729 | |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1730 | trace_seq_printf(s, "# %ld %ld %ld\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1731 | field->arg1, |
| 1732 | field->arg2, |
| 1733 | field->arg3); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1734 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1735 | } |
| 1736 | case TRACE_STACK: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1737 | struct stack_entry *field; |
| 1738 | |
| 1739 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1740 | |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1741 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
| 1742 | if (i) |
| 1743 | trace_seq_puts(s, " <= "); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1744 | seq_print_ip_sym(s, field->caller[i], sym_flags); |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1745 | } |
| 1746 | trace_seq_puts(s, "\n"); |
| 1747 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1748 | } |
| 1749 | case TRACE_PRINT: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1750 | struct print_entry *field; |
| 1751 | |
| 1752 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1753 | |
| 1754 | seq_print_ip_sym(s, field->ip, sym_flags); |
| 1755 | trace_seq_printf(s, ": %s", field->buf); |
| 1756 | if (entry->flags & TRACE_FLAG_CONT) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1757 | trace_seq_print_cont(s, iter); |
| 1758 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1759 | } |
Steven Rostedt | 9f029e8 | 2008-11-12 15:24:24 -0500 | [diff] [blame] | 1760 | case TRACE_BRANCH: { |
| 1761 | struct trace_branch *field; |
Steven Rostedt | 52f232c | 2008-11-12 00:14:40 -0500 | [diff] [blame] | 1762 | |
| 1763 | trace_assign_type(field, entry); |
| 1764 | |
| 1765 | trace_seq_printf(s, "[%s] %s:%s:%d\n", |
Ingo Molnar | 68d119f | 2008-11-12 14:09:30 +0100 | [diff] [blame] | 1766 | field->correct ? " ok " : " MISS ", |
Steven Rostedt | 52f232c | 2008-11-12 00:14:40 -0500 | [diff] [blame] | 1767 | field->func, |
| 1768 | field->file, |
| 1769 | field->line); |
| 1770 | break; |
| 1771 | } |
Török Edwin | 02b6751 | 2008-11-22 13:28:47 +0200 | [diff] [blame^] | 1772 | case TRACE_USER_STACK: { |
| 1773 | struct userstack_entry *field; |
| 1774 | |
| 1775 | trace_assign_type(field, entry); |
| 1776 | |
| 1777 | seq_print_userip_objs(field, s, sym_flags); |
| 1778 | if (entry->flags & TRACE_FLAG_CONT) |
| 1779 | trace_seq_print_cont(s, iter); |
| 1780 | break; |
| 1781 | } |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1782 | default: |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1783 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1784 | } |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1785 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1786 | } |
| 1787 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1788 | static enum print_line_t print_trace_fmt(struct trace_iterator *iter) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1789 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1790 | struct trace_seq *s = &iter->seq; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1791 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1792 | struct trace_entry *entry; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1793 | unsigned long usec_rem; |
| 1794 | unsigned long long t; |
| 1795 | unsigned long secs; |
| 1796 | char *comm; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1797 | int ret; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1798 | int S, T; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1799 | int i; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1800 | |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1801 | entry = iter->ent; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1802 | |
| 1803 | if (entry->type == TRACE_CONT) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1804 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1805 | |
Steven Rostedt | a309720 | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 1806 | test_cpu_buff_start(iter); |
| 1807 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1808 | comm = trace_find_cmdline(iter->ent->pid); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1809 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1810 | t = ns2usecs(iter->ts); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1811 | usec_rem = do_div(t, 1000000ULL); |
| 1812 | secs = (unsigned long)t; |
| 1813 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1814 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1815 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1816 | return TRACE_TYPE_PARTIAL_LINE; |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1817 | ret = trace_seq_printf(s, "[%03d] ", iter->cpu); |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1818 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1819 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1820 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); |
| 1821 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1822 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1823 | |
| 1824 | switch (entry->type) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1825 | case TRACE_FN: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1826 | struct ftrace_entry *field; |
| 1827 | |
| 1828 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1829 | |
| 1830 | ret = seq_print_ip_sym(s, field->ip, sym_flags); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1831 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1832 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1833 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1834 | field->parent_ip) { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1835 | ret = trace_seq_printf(s, " <-"); |
| 1836 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1837 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | b3aa557 | 2008-10-31 15:44:07 -0400 | [diff] [blame] | 1838 | ret = seq_print_ip_sym(s, |
| 1839 | field->parent_ip, |
| 1840 | sym_flags); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1841 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1842 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1843 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1844 | ret = trace_seq_printf(s, "\n"); |
| 1845 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1846 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1847 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1848 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1849 | case TRACE_CTX: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1850 | case TRACE_WAKE: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1851 | struct ctx_switch_entry *field; |
| 1852 | |
| 1853 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1854 | |
| 1855 | S = field->prev_state < sizeof(state_to_char) ? |
| 1856 | state_to_char[field->prev_state] : 'X'; |
| 1857 | T = field->next_state < sizeof(state_to_char) ? |
| 1858 | state_to_char[field->next_state] : 'X'; |
Peter Zijlstra | 80b5e94 | 2008-09-04 10:24:16 +0200 | [diff] [blame] | 1859 | ret = trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1860 | field->prev_pid, |
| 1861 | field->prev_prio, |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1862 | S, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1863 | entry->type == TRACE_CTX ? "==>" : " +", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1864 | field->next_cpu, |
| 1865 | field->next_pid, |
| 1866 | field->next_prio, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1867 | T); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1868 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1869 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1870 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1871 | } |
| 1872 | case TRACE_SPECIAL: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1873 | struct special_entry *field; |
| 1874 | |
| 1875 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1876 | |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1877 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1878 | field->arg1, |
| 1879 | field->arg2, |
| 1880 | field->arg3); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1881 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1882 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1883 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1884 | } |
| 1885 | case TRACE_STACK: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1886 | struct stack_entry *field; |
| 1887 | |
| 1888 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1889 | |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1890 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
| 1891 | if (i) { |
| 1892 | ret = trace_seq_puts(s, " <= "); |
| 1893 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1894 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1895 | } |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1896 | ret = seq_print_ip_sym(s, field->caller[i], |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1897 | sym_flags); |
| 1898 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1899 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1900 | } |
| 1901 | ret = trace_seq_puts(s, "\n"); |
| 1902 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1903 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1904 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1905 | } |
| 1906 | case TRACE_PRINT: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1907 | struct print_entry *field; |
| 1908 | |
| 1909 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1910 | |
| 1911 | seq_print_ip_sym(s, field->ip, sym_flags); |
| 1912 | trace_seq_printf(s, ": %s", field->buf); |
| 1913 | if (entry->flags & TRACE_FLAG_CONT) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1914 | trace_seq_print_cont(s, iter); |
| 1915 | break; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1916 | } |
Frederic Weisbecker | 15e6cb3 | 2008-11-11 07:14:25 +0100 | [diff] [blame] | 1917 | case TRACE_FN_RET: { |
| 1918 | return print_return_function(iter); |
| 1919 | break; |
| 1920 | } |
Steven Rostedt | 9f029e8 | 2008-11-12 15:24:24 -0500 | [diff] [blame] | 1921 | case TRACE_BRANCH: { |
| 1922 | struct trace_branch *field; |
Steven Rostedt | 52f232c | 2008-11-12 00:14:40 -0500 | [diff] [blame] | 1923 | |
| 1924 | trace_assign_type(field, entry); |
| 1925 | |
| 1926 | trace_seq_printf(s, "[%s] %s:%s:%d\n", |
Ingo Molnar | 68d119f | 2008-11-12 14:09:30 +0100 | [diff] [blame] | 1927 | field->correct ? " ok " : " MISS ", |
Steven Rostedt | 52f232c | 2008-11-12 00:14:40 -0500 | [diff] [blame] | 1928 | field->func, |
| 1929 | field->file, |
| 1930 | field->line); |
| 1931 | break; |
| 1932 | } |
Török Edwin | 02b6751 | 2008-11-22 13:28:47 +0200 | [diff] [blame^] | 1933 | case TRACE_USER_STACK: { |
| 1934 | struct userstack_entry *field; |
| 1935 | |
| 1936 | trace_assign_type(field, entry); |
| 1937 | |
| 1938 | ret = seq_print_userip_objs(field, s, sym_flags); |
| 1939 | if (!ret) |
| 1940 | return TRACE_TYPE_PARTIAL_LINE; |
| 1941 | ret = trace_seq_putc(s, '\n'); |
| 1942 | if (!ret) |
| 1943 | return TRACE_TYPE_PARTIAL_LINE; |
| 1944 | break; |
| 1945 | } |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1946 | } |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1947 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1948 | } |
| 1949 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1950 | static enum print_line_t print_raw_fmt(struct trace_iterator *iter) |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1951 | { |
| 1952 | struct trace_seq *s = &iter->seq; |
| 1953 | struct trace_entry *entry; |
| 1954 | int ret; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1955 | int S, T; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1956 | |
| 1957 | entry = iter->ent; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1958 | |
| 1959 | if (entry->type == TRACE_CONT) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1960 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1961 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1962 | ret = trace_seq_printf(s, "%d %d %llu ", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1963 | entry->pid, iter->cpu, iter->ts); |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1964 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1965 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1966 | |
| 1967 | switch (entry->type) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1968 | case TRACE_FN: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1969 | struct ftrace_entry *field; |
| 1970 | |
| 1971 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1972 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1973 | ret = trace_seq_printf(s, "%x %x\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1974 | field->ip, |
| 1975 | field->parent_ip); |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1976 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1977 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1978 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1979 | } |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1980 | case TRACE_CTX: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1981 | case TRACE_WAKE: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1982 | struct ctx_switch_entry *field; |
| 1983 | |
| 1984 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1985 | |
| 1986 | S = field->prev_state < sizeof(state_to_char) ? |
| 1987 | state_to_char[field->prev_state] : 'X'; |
| 1988 | T = field->next_state < sizeof(state_to_char) ? |
| 1989 | state_to_char[field->next_state] : 'X'; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1990 | if (entry->type == TRACE_WAKE) |
| 1991 | S = '+'; |
Peter Zijlstra | 80b5e94 | 2008-09-04 10:24:16 +0200 | [diff] [blame] | 1992 | ret = trace_seq_printf(s, "%d %d %c %d %d %d %c\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1993 | field->prev_pid, |
| 1994 | field->prev_prio, |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1995 | S, |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1996 | field->next_cpu, |
| 1997 | field->next_pid, |
| 1998 | field->next_prio, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1999 | T); |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2000 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 2001 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2002 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2003 | } |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2004 | case TRACE_SPECIAL: |
Török Edwin | 02b6751 | 2008-11-22 13:28:47 +0200 | [diff] [blame^] | 2005 | case TRACE_USER_STACK: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2006 | case TRACE_STACK: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 2007 | struct special_entry *field; |
| 2008 | |
| 2009 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2010 | |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 2011 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2012 | field->arg1, |
| 2013 | field->arg2, |
| 2014 | field->arg3); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2015 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 2016 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2017 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2018 | } |
| 2019 | case TRACE_PRINT: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 2020 | struct print_entry *field; |
| 2021 | |
| 2022 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2023 | |
| 2024 | trace_seq_printf(s, "# %lx %s", field->ip, field->buf); |
| 2025 | if (entry->flags & TRACE_FLAG_CONT) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 2026 | trace_seq_print_cont(s, iter); |
| 2027 | break; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2028 | } |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2029 | } |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 2030 | return TRACE_TYPE_HANDLED; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2031 | } |
| 2032 | |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2033 | #define SEQ_PUT_FIELD_RET(s, x) \ |
| 2034 | do { \ |
| 2035 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ |
| 2036 | return 0; \ |
| 2037 | } while (0) |
| 2038 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2039 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
| 2040 | do { \ |
Harvey Harrison | ad0a3b6 | 2008-10-08 17:44:55 -0700 | [diff] [blame] | 2041 | BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES); \ |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2042 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ |
| 2043 | return 0; \ |
| 2044 | } while (0) |
| 2045 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 2046 | static enum print_line_t print_hex_fmt(struct trace_iterator *iter) |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2047 | { |
| 2048 | struct trace_seq *s = &iter->seq; |
| 2049 | unsigned char newline = '\n'; |
| 2050 | struct trace_entry *entry; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 2051 | int S, T; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2052 | |
| 2053 | entry = iter->ent; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 2054 | |
| 2055 | if (entry->type == TRACE_CONT) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 2056 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 2057 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2058 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2059 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2060 | SEQ_PUT_HEX_FIELD_RET(s, iter->ts); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2061 | |
| 2062 | switch (entry->type) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2063 | case TRACE_FN: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 2064 | struct ftrace_entry *field; |
| 2065 | |
| 2066 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2067 | |
| 2068 | SEQ_PUT_HEX_FIELD_RET(s, field->ip); |
| 2069 | SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2070 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2071 | } |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2072 | case TRACE_CTX: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2073 | case TRACE_WAKE: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 2074 | struct ctx_switch_entry *field; |
| 2075 | |
| 2076 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2077 | |
| 2078 | S = field->prev_state < sizeof(state_to_char) ? |
| 2079 | state_to_char[field->prev_state] : 'X'; |
| 2080 | T = field->next_state < sizeof(state_to_char) ? |
| 2081 | state_to_char[field->next_state] : 'X'; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 2082 | if (entry->type == TRACE_WAKE) |
| 2083 | S = '+'; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2084 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid); |
| 2085 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2086 | SEQ_PUT_HEX_FIELD_RET(s, S); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2087 | SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu); |
| 2088 | SEQ_PUT_HEX_FIELD_RET(s, field->next_pid); |
| 2089 | SEQ_PUT_HEX_FIELD_RET(s, field->next_prio); |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 2090 | SEQ_PUT_HEX_FIELD_RET(s, T); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2091 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2092 | } |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2093 | case TRACE_SPECIAL: |
Török Edwin | 02b6751 | 2008-11-22 13:28:47 +0200 | [diff] [blame^] | 2094 | case TRACE_USER_STACK: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2095 | case TRACE_STACK: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 2096 | struct special_entry *field; |
| 2097 | |
| 2098 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2099 | |
| 2100 | SEQ_PUT_HEX_FIELD_RET(s, field->arg1); |
| 2101 | SEQ_PUT_HEX_FIELD_RET(s, field->arg2); |
| 2102 | SEQ_PUT_HEX_FIELD_RET(s, field->arg3); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2103 | break; |
| 2104 | } |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2105 | } |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2106 | SEQ_PUT_FIELD_RET(s, newline); |
| 2107 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 2108 | return TRACE_TYPE_HANDLED; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2109 | } |
| 2110 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 2111 | static enum print_line_t print_bin_fmt(struct trace_iterator *iter) |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2112 | { |
| 2113 | struct trace_seq *s = &iter->seq; |
| 2114 | struct trace_entry *entry; |
| 2115 | |
| 2116 | entry = iter->ent; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 2117 | |
| 2118 | if (entry->type == TRACE_CONT) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 2119 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 2120 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2121 | SEQ_PUT_FIELD_RET(s, entry->pid); |
Eric Anholt | 072ba49 | 2008-10-26 15:26:57 -0700 | [diff] [blame] | 2122 | SEQ_PUT_FIELD_RET(s, entry->cpu); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2123 | SEQ_PUT_FIELD_RET(s, iter->ts); |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2124 | |
| 2125 | switch (entry->type) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2126 | case TRACE_FN: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 2127 | struct ftrace_entry *field; |
| 2128 | |
| 2129 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2130 | |
| 2131 | SEQ_PUT_FIELD_RET(s, field->ip); |
| 2132 | SEQ_PUT_FIELD_RET(s, field->parent_ip); |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2133 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2134 | } |
| 2135 | case TRACE_CTX: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 2136 | struct ctx_switch_entry *field; |
| 2137 | |
| 2138 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2139 | |
| 2140 | SEQ_PUT_FIELD_RET(s, field->prev_pid); |
| 2141 | SEQ_PUT_FIELD_RET(s, field->prev_prio); |
| 2142 | SEQ_PUT_FIELD_RET(s, field->prev_state); |
| 2143 | SEQ_PUT_FIELD_RET(s, field->next_pid); |
| 2144 | SEQ_PUT_FIELD_RET(s, field->next_prio); |
| 2145 | SEQ_PUT_FIELD_RET(s, field->next_state); |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2146 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2147 | } |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2148 | case TRACE_SPECIAL: |
Török Edwin | 02b6751 | 2008-11-22 13:28:47 +0200 | [diff] [blame^] | 2149 | case TRACE_USER_STACK: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2150 | case TRACE_STACK: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 2151 | struct special_entry *field; |
| 2152 | |
| 2153 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2154 | |
| 2155 | SEQ_PUT_FIELD_RET(s, field->arg1); |
| 2156 | SEQ_PUT_FIELD_RET(s, field->arg2); |
| 2157 | SEQ_PUT_FIELD_RET(s, field->arg3); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2158 | break; |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2159 | } |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2160 | } |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2161 | return 1; |
| 2162 | } |
| 2163 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2164 | static int trace_empty(struct trace_iterator *iter) |
| 2165 | { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2166 | int cpu; |
| 2167 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2168 | for_each_tracing_cpu(cpu) { |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 2169 | if (iter->buffer_iter[cpu]) { |
| 2170 | if (!ring_buffer_iter_empty(iter->buffer_iter[cpu])) |
| 2171 | return 0; |
| 2172 | } else { |
| 2173 | if (!ring_buffer_empty_cpu(iter->tr->buffer, cpu)) |
| 2174 | return 0; |
| 2175 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2176 | } |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 2177 | |
Frederic Weisbecker | 797d371 | 2008-09-30 18:13:45 +0200 | [diff] [blame] | 2178 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2179 | } |
| 2180 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 2181 | static enum print_line_t print_trace_line(struct trace_iterator *iter) |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2182 | { |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 2183 | enum print_line_t ret; |
| 2184 | |
| 2185 | if (iter->trace && iter->trace->print_line) { |
| 2186 | ret = iter->trace->print_line(iter); |
| 2187 | if (ret != TRACE_TYPE_UNHANDLED) |
| 2188 | return ret; |
| 2189 | } |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 2190 | |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2191 | if (trace_flags & TRACE_ITER_BIN) |
| 2192 | return print_bin_fmt(iter); |
| 2193 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2194 | if (trace_flags & TRACE_ITER_HEX) |
| 2195 | return print_hex_fmt(iter); |
| 2196 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2197 | if (trace_flags & TRACE_ITER_RAW) |
| 2198 | return print_raw_fmt(iter); |
| 2199 | |
| 2200 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) |
| 2201 | return print_lat_fmt(iter, iter->idx, iter->cpu); |
| 2202 | |
| 2203 | return print_trace_fmt(iter); |
| 2204 | } |
| 2205 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2206 | static int s_show(struct seq_file *m, void *v) |
| 2207 | { |
| 2208 | struct trace_iterator *iter = v; |
| 2209 | |
| 2210 | if (iter->ent == NULL) { |
| 2211 | if (iter->tr) { |
| 2212 | seq_printf(m, "# tracer: %s\n", iter->trace->name); |
| 2213 | seq_puts(m, "#\n"); |
| 2214 | } |
| 2215 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { |
| 2216 | /* print nothing if the buffers are empty */ |
| 2217 | if (trace_empty(iter)) |
| 2218 | return 0; |
| 2219 | print_trace_header(m, iter); |
| 2220 | if (!(trace_flags & TRACE_ITER_VERBOSE)) |
| 2221 | print_lat_help_header(m); |
| 2222 | } else { |
| 2223 | if (!(trace_flags & TRACE_ITER_VERBOSE)) |
| 2224 | print_func_help_header(m); |
| 2225 | } |
| 2226 | } else { |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2227 | print_trace_line(iter); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2228 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2229 | } |
| 2230 | |
| 2231 | return 0; |
| 2232 | } |
| 2233 | |
| 2234 | static struct seq_operations tracer_seq_ops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2235 | .start = s_start, |
| 2236 | .next = s_next, |
| 2237 | .stop = s_stop, |
| 2238 | .show = s_show, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2239 | }; |
| 2240 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 2241 | static struct trace_iterator * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2242 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
| 2243 | { |
| 2244 | struct trace_iterator *iter; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2245 | struct seq_file *m; |
| 2246 | int cpu; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2247 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2248 | if (tracing_disabled) { |
| 2249 | *ret = -ENODEV; |
| 2250 | return NULL; |
| 2251 | } |
| 2252 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2253 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 2254 | if (!iter) { |
| 2255 | *ret = -ENOMEM; |
| 2256 | goto out; |
| 2257 | } |
| 2258 | |
| 2259 | mutex_lock(&trace_types_lock); |
| 2260 | if (current_trace && current_trace->print_max) |
| 2261 | iter->tr = &max_tr; |
| 2262 | else |
| 2263 | iter->tr = inode->i_private; |
| 2264 | iter->trace = current_trace; |
| 2265 | iter->pos = -1; |
| 2266 | |
Steven Rostedt | 12ef7d4 | 2008-11-12 17:52:38 -0500 | [diff] [blame] | 2267 | /* Annotate start of buffers if we had overruns */ |
| 2268 | if (ring_buffer_overruns(iter->tr->buffer)) |
| 2269 | iter->iter_flags |= TRACE_FILE_ANNOTATE; |
| 2270 | |
| 2271 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2272 | for_each_tracing_cpu(cpu) { |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 2273 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2274 | iter->buffer_iter[cpu] = |
| 2275 | ring_buffer_read_start(iter->tr->buffer, cpu); |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 2276 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2277 | if (!iter->buffer_iter[cpu]) |
| 2278 | goto fail_buffer; |
| 2279 | } |
| 2280 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2281 | /* TODO stop tracer */ |
| 2282 | *ret = seq_open(file, &tracer_seq_ops); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2283 | if (*ret) |
| 2284 | goto fail_buffer; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2285 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2286 | m = file->private_data; |
| 2287 | m->private = iter; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2288 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2289 | /* stop the trace while dumping */ |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 2290 | tracing_stop(); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2291 | |
| 2292 | if (iter->trace && iter->trace->open) |
| 2293 | iter->trace->open(iter); |
| 2294 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2295 | mutex_unlock(&trace_types_lock); |
| 2296 | |
| 2297 | out: |
| 2298 | return iter; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2299 | |
| 2300 | fail_buffer: |
| 2301 | for_each_tracing_cpu(cpu) { |
| 2302 | if (iter->buffer_iter[cpu]) |
| 2303 | ring_buffer_read_finish(iter->buffer_iter[cpu]); |
| 2304 | } |
| 2305 | mutex_unlock(&trace_types_lock); |
Julia Lawall | 0bb943c | 2008-11-14 19:05:31 +0100 | [diff] [blame] | 2306 | kfree(iter); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2307 | |
| 2308 | return ERR_PTR(-ENOMEM); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2309 | } |
| 2310 | |
| 2311 | int tracing_open_generic(struct inode *inode, struct file *filp) |
| 2312 | { |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2313 | if (tracing_disabled) |
| 2314 | return -ENODEV; |
| 2315 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2316 | filp->private_data = inode->i_private; |
| 2317 | return 0; |
| 2318 | } |
| 2319 | |
| 2320 | int tracing_release(struct inode *inode, struct file *file) |
| 2321 | { |
| 2322 | struct seq_file *m = (struct seq_file *)file->private_data; |
| 2323 | struct trace_iterator *iter = m->private; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2324 | int cpu; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2325 | |
| 2326 | mutex_lock(&trace_types_lock); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2327 | for_each_tracing_cpu(cpu) { |
| 2328 | if (iter->buffer_iter[cpu]) |
| 2329 | ring_buffer_read_finish(iter->buffer_iter[cpu]); |
| 2330 | } |
| 2331 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2332 | if (iter->trace && iter->trace->close) |
| 2333 | iter->trace->close(iter); |
| 2334 | |
| 2335 | /* reenable tracing if it was previously enabled */ |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 2336 | tracing_start(); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2337 | mutex_unlock(&trace_types_lock); |
| 2338 | |
| 2339 | seq_release(inode, file); |
| 2340 | kfree(iter); |
| 2341 | return 0; |
| 2342 | } |
| 2343 | |
| 2344 | static int tracing_open(struct inode *inode, struct file *file) |
| 2345 | { |
| 2346 | int ret; |
| 2347 | |
| 2348 | __tracing_open(inode, file, &ret); |
| 2349 | |
| 2350 | return ret; |
| 2351 | } |
| 2352 | |
| 2353 | static int tracing_lt_open(struct inode *inode, struct file *file) |
| 2354 | { |
| 2355 | struct trace_iterator *iter; |
| 2356 | int ret; |
| 2357 | |
| 2358 | iter = __tracing_open(inode, file, &ret); |
| 2359 | |
| 2360 | if (!ret) |
| 2361 | iter->iter_flags |= TRACE_FILE_LAT_FMT; |
| 2362 | |
| 2363 | return ret; |
| 2364 | } |
| 2365 | |
| 2366 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 2367 | static void * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2368 | t_next(struct seq_file *m, void *v, loff_t *pos) |
| 2369 | { |
| 2370 | struct tracer *t = m->private; |
| 2371 | |
| 2372 | (*pos)++; |
| 2373 | |
| 2374 | if (t) |
| 2375 | t = t->next; |
| 2376 | |
| 2377 | m->private = t; |
| 2378 | |
| 2379 | return t; |
| 2380 | } |
| 2381 | |
| 2382 | static void *t_start(struct seq_file *m, loff_t *pos) |
| 2383 | { |
| 2384 | struct tracer *t = m->private; |
| 2385 | loff_t l = 0; |
| 2386 | |
| 2387 | mutex_lock(&trace_types_lock); |
| 2388 | for (; t && l < *pos; t = t_next(m, t, &l)) |
| 2389 | ; |
| 2390 | |
| 2391 | return t; |
| 2392 | } |
| 2393 | |
| 2394 | static void t_stop(struct seq_file *m, void *p) |
| 2395 | { |
| 2396 | mutex_unlock(&trace_types_lock); |
| 2397 | } |
| 2398 | |
| 2399 | static int t_show(struct seq_file *m, void *v) |
| 2400 | { |
| 2401 | struct tracer *t = v; |
| 2402 | |
| 2403 | if (!t) |
| 2404 | return 0; |
| 2405 | |
| 2406 | seq_printf(m, "%s", t->name); |
| 2407 | if (t->next) |
| 2408 | seq_putc(m, ' '); |
| 2409 | else |
| 2410 | seq_putc(m, '\n'); |
| 2411 | |
| 2412 | return 0; |
| 2413 | } |
| 2414 | |
| 2415 | static struct seq_operations show_traces_seq_ops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2416 | .start = t_start, |
| 2417 | .next = t_next, |
| 2418 | .stop = t_stop, |
| 2419 | .show = t_show, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2420 | }; |
| 2421 | |
| 2422 | static int show_traces_open(struct inode *inode, struct file *file) |
| 2423 | { |
| 2424 | int ret; |
| 2425 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2426 | if (tracing_disabled) |
| 2427 | return -ENODEV; |
| 2428 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2429 | ret = seq_open(file, &show_traces_seq_ops); |
| 2430 | if (!ret) { |
| 2431 | struct seq_file *m = file->private_data; |
| 2432 | m->private = trace_types; |
| 2433 | } |
| 2434 | |
| 2435 | return ret; |
| 2436 | } |
| 2437 | |
| 2438 | static struct file_operations tracing_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2439 | .open = tracing_open, |
| 2440 | .read = seq_read, |
| 2441 | .llseek = seq_lseek, |
| 2442 | .release = tracing_release, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2443 | }; |
| 2444 | |
| 2445 | static struct file_operations tracing_lt_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2446 | .open = tracing_lt_open, |
| 2447 | .read = seq_read, |
| 2448 | .llseek = seq_lseek, |
| 2449 | .release = tracing_release, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2450 | }; |
| 2451 | |
| 2452 | static struct file_operations show_traces_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2453 | .open = show_traces_open, |
| 2454 | .read = seq_read, |
| 2455 | .release = seq_release, |
| 2456 | }; |
| 2457 | |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2458 | /* |
| 2459 | * Only trace on a CPU if the bitmask is set: |
| 2460 | */ |
| 2461 | static cpumask_t tracing_cpumask = CPU_MASK_ALL; |
| 2462 | |
| 2463 | /* |
| 2464 | * When tracing/tracing_cpu_mask is modified then this holds |
| 2465 | * the new bitmask we are about to install: |
| 2466 | */ |
| 2467 | static cpumask_t tracing_cpumask_new; |
| 2468 | |
| 2469 | /* |
| 2470 | * The tracer itself will not take this lock, but still we want |
| 2471 | * to provide a consistent cpumask to user-space: |
| 2472 | */ |
| 2473 | static DEFINE_MUTEX(tracing_cpumask_update_lock); |
| 2474 | |
| 2475 | /* |
| 2476 | * Temporary storage for the character representation of the |
| 2477 | * CPU bitmask (and one more byte for the newline): |
| 2478 | */ |
| 2479 | static char mask_str[NR_CPUS + 1]; |
| 2480 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2481 | static ssize_t |
| 2482 | tracing_cpumask_read(struct file *filp, char __user *ubuf, |
| 2483 | size_t count, loff_t *ppos) |
| 2484 | { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2485 | int len; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2486 | |
| 2487 | mutex_lock(&tracing_cpumask_update_lock); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2488 | |
| 2489 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); |
| 2490 | if (count - len < 2) { |
| 2491 | count = -EINVAL; |
| 2492 | goto out_err; |
| 2493 | } |
| 2494 | len += sprintf(mask_str + len, "\n"); |
| 2495 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); |
| 2496 | |
| 2497 | out_err: |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2498 | mutex_unlock(&tracing_cpumask_update_lock); |
| 2499 | |
| 2500 | return count; |
| 2501 | } |
| 2502 | |
| 2503 | static ssize_t |
| 2504 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, |
| 2505 | size_t count, loff_t *ppos) |
| 2506 | { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2507 | int err, cpu; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2508 | |
| 2509 | mutex_lock(&tracing_cpumask_update_lock); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2510 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
| 2511 | if (err) |
| 2512 | goto err_unlock; |
| 2513 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2514 | raw_local_irq_disable(); |
| 2515 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2516 | for_each_tracing_cpu(cpu) { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2517 | /* |
| 2518 | * Increase/decrease the disabled counter if we are |
| 2519 | * about to flip a bit in the cpumask: |
| 2520 | */ |
| 2521 | if (cpu_isset(cpu, tracing_cpumask) && |
| 2522 | !cpu_isset(cpu, tracing_cpumask_new)) { |
| 2523 | atomic_inc(&global_trace.data[cpu]->disabled); |
| 2524 | } |
| 2525 | if (!cpu_isset(cpu, tracing_cpumask) && |
| 2526 | cpu_isset(cpu, tracing_cpumask_new)) { |
| 2527 | atomic_dec(&global_trace.data[cpu]->disabled); |
| 2528 | } |
| 2529 | } |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2530 | __raw_spin_unlock(&ftrace_max_lock); |
| 2531 | raw_local_irq_enable(); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2532 | |
| 2533 | tracing_cpumask = tracing_cpumask_new; |
| 2534 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2535 | mutex_unlock(&tracing_cpumask_update_lock); |
| 2536 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2537 | return count; |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2538 | |
| 2539 | err_unlock: |
| 2540 | mutex_unlock(&tracing_cpumask_update_lock); |
| 2541 | |
| 2542 | return err; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2543 | } |
| 2544 | |
| 2545 | static struct file_operations tracing_cpumask_fops = { |
| 2546 | .open = tracing_open_generic, |
| 2547 | .read = tracing_cpumask_read, |
| 2548 | .write = tracing_cpumask_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2549 | }; |
| 2550 | |
| 2551 | static ssize_t |
Steven Rostedt | ee6bce5 | 2008-11-12 17:52:37 -0500 | [diff] [blame] | 2552 | tracing_trace_options_read(struct file *filp, char __user *ubuf, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2553 | size_t cnt, loff_t *ppos) |
| 2554 | { |
Frederic Weisbecker | adf9f19 | 2008-11-17 19:23:42 +0100 | [diff] [blame] | 2555 | int i; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2556 | char *buf; |
| 2557 | int r = 0; |
| 2558 | int len = 0; |
Frederic Weisbecker | adf9f19 | 2008-11-17 19:23:42 +0100 | [diff] [blame] | 2559 | u32 tracer_flags = current_trace->flags->val; |
| 2560 | struct tracer_opt *trace_opts = current_trace->flags->opts; |
| 2561 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2562 | |
| 2563 | /* calulate max size */ |
| 2564 | for (i = 0; trace_options[i]; i++) { |
| 2565 | len += strlen(trace_options[i]); |
| 2566 | len += 3; /* "no" and space */ |
| 2567 | } |
| 2568 | |
Frederic Weisbecker | adf9f19 | 2008-11-17 19:23:42 +0100 | [diff] [blame] | 2569 | /* |
| 2570 | * Increase the size with names of options specific |
| 2571 | * of the current tracer. |
| 2572 | */ |
| 2573 | for (i = 0; trace_opts[i].name; i++) { |
| 2574 | len += strlen(trace_opts[i].name); |
| 2575 | len += 3; /* "no" and space */ |
| 2576 | } |
| 2577 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2578 | /* +2 for \n and \0 */ |
| 2579 | buf = kmalloc(len + 2, GFP_KERNEL); |
| 2580 | if (!buf) |
| 2581 | return -ENOMEM; |
| 2582 | |
| 2583 | for (i = 0; trace_options[i]; i++) { |
| 2584 | if (trace_flags & (1 << i)) |
| 2585 | r += sprintf(buf + r, "%s ", trace_options[i]); |
| 2586 | else |
| 2587 | r += sprintf(buf + r, "no%s ", trace_options[i]); |
| 2588 | } |
| 2589 | |
Frederic Weisbecker | adf9f19 | 2008-11-17 19:23:42 +0100 | [diff] [blame] | 2590 | for (i = 0; trace_opts[i].name; i++) { |
| 2591 | if (tracer_flags & trace_opts[i].bit) |
| 2592 | r += sprintf(buf + r, "%s ", |
| 2593 | trace_opts[i].name); |
| 2594 | else |
| 2595 | r += sprintf(buf + r, "no%s ", |
| 2596 | trace_opts[i].name); |
| 2597 | } |
| 2598 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2599 | r += sprintf(buf + r, "\n"); |
| 2600 | WARN_ON(r >= len + 2); |
| 2601 | |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2602 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2603 | |
| 2604 | kfree(buf); |
| 2605 | |
| 2606 | return r; |
| 2607 | } |
| 2608 | |
Frederic Weisbecker | adf9f19 | 2008-11-17 19:23:42 +0100 | [diff] [blame] | 2609 | /* Try to assign a tracer specific option */ |
| 2610 | static int set_tracer_option(struct tracer *trace, char *cmp, int neg) |
| 2611 | { |
| 2612 | struct tracer_flags *trace_flags = trace->flags; |
| 2613 | struct tracer_opt *opts = NULL; |
| 2614 | int ret = 0, i = 0; |
| 2615 | int len; |
| 2616 | |
| 2617 | for (i = 0; trace_flags->opts[i].name; i++) { |
| 2618 | opts = &trace_flags->opts[i]; |
| 2619 | len = strlen(opts->name); |
| 2620 | |
| 2621 | if (strncmp(cmp, opts->name, len) == 0) { |
| 2622 | ret = trace->set_flag(trace_flags->val, |
| 2623 | opts->bit, !neg); |
| 2624 | break; |
| 2625 | } |
| 2626 | } |
| 2627 | /* Not found */ |
| 2628 | if (!trace_flags->opts[i].name) |
| 2629 | return -EINVAL; |
| 2630 | |
| 2631 | /* Refused to handle */ |
| 2632 | if (ret) |
| 2633 | return ret; |
| 2634 | |
| 2635 | if (neg) |
| 2636 | trace_flags->val &= ~opts->bit; |
| 2637 | else |
| 2638 | trace_flags->val |= opts->bit; |
| 2639 | |
| 2640 | return 0; |
| 2641 | } |
| 2642 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2643 | static ssize_t |
Steven Rostedt | ee6bce5 | 2008-11-12 17:52:37 -0500 | [diff] [blame] | 2644 | tracing_trace_options_write(struct file *filp, const char __user *ubuf, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2645 | size_t cnt, loff_t *ppos) |
| 2646 | { |
| 2647 | char buf[64]; |
| 2648 | char *cmp = buf; |
| 2649 | int neg = 0; |
Frederic Weisbecker | adf9f19 | 2008-11-17 19:23:42 +0100 | [diff] [blame] | 2650 | int ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2651 | int i; |
| 2652 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2653 | if (cnt >= sizeof(buf)) |
| 2654 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2655 | |
| 2656 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2657 | return -EFAULT; |
| 2658 | |
| 2659 | buf[cnt] = 0; |
| 2660 | |
| 2661 | if (strncmp(buf, "no", 2) == 0) { |
| 2662 | neg = 1; |
| 2663 | cmp += 2; |
| 2664 | } |
| 2665 | |
| 2666 | for (i = 0; trace_options[i]; i++) { |
| 2667 | int len = strlen(trace_options[i]); |
| 2668 | |
| 2669 | if (strncmp(cmp, trace_options[i], len) == 0) { |
| 2670 | if (neg) |
| 2671 | trace_flags &= ~(1 << i); |
| 2672 | else |
| 2673 | trace_flags |= (1 << i); |
| 2674 | break; |
| 2675 | } |
| 2676 | } |
Frederic Weisbecker | adf9f19 | 2008-11-17 19:23:42 +0100 | [diff] [blame] | 2677 | |
| 2678 | /* If no option could be set, test the specific tracer options */ |
| 2679 | if (!trace_options[i]) { |
| 2680 | ret = set_tracer_option(current_trace, cmp, neg); |
| 2681 | if (ret) |
| 2682 | return ret; |
| 2683 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2684 | |
| 2685 | filp->f_pos += cnt; |
| 2686 | |
| 2687 | return cnt; |
| 2688 | } |
| 2689 | |
| 2690 | static struct file_operations tracing_iter_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2691 | .open = tracing_open_generic, |
Steven Rostedt | ee6bce5 | 2008-11-12 17:52:37 -0500 | [diff] [blame] | 2692 | .read = tracing_trace_options_read, |
| 2693 | .write = tracing_trace_options_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2694 | }; |
| 2695 | |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2696 | static const char readme_msg[] = |
| 2697 | "tracing mini-HOWTO:\n\n" |
| 2698 | "# mkdir /debug\n" |
| 2699 | "# mount -t debugfs nodev /debug\n\n" |
| 2700 | "# cat /debug/tracing/available_tracers\n" |
| 2701 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" |
| 2702 | "# cat /debug/tracing/current_tracer\n" |
| 2703 | "none\n" |
| 2704 | "# echo sched_switch > /debug/tracing/current_tracer\n" |
| 2705 | "# cat /debug/tracing/current_tracer\n" |
| 2706 | "sched_switch\n" |
Steven Rostedt | ee6bce5 | 2008-11-12 17:52:37 -0500 | [diff] [blame] | 2707 | "# cat /debug/tracing/trace_options\n" |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2708 | "noprint-parent nosym-offset nosym-addr noverbose\n" |
Steven Rostedt | ee6bce5 | 2008-11-12 17:52:37 -0500 | [diff] [blame] | 2709 | "# echo print-parent > /debug/tracing/trace_options\n" |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2710 | "# echo 1 > /debug/tracing/tracing_enabled\n" |
| 2711 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" |
| 2712 | "echo 0 > /debug/tracing/tracing_enabled\n" |
| 2713 | ; |
| 2714 | |
| 2715 | static ssize_t |
| 2716 | tracing_readme_read(struct file *filp, char __user *ubuf, |
| 2717 | size_t cnt, loff_t *ppos) |
| 2718 | { |
| 2719 | return simple_read_from_buffer(ubuf, cnt, ppos, |
| 2720 | readme_msg, strlen(readme_msg)); |
| 2721 | } |
| 2722 | |
| 2723 | static struct file_operations tracing_readme_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2724 | .open = tracing_open_generic, |
| 2725 | .read = tracing_readme_read, |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2726 | }; |
| 2727 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2728 | static ssize_t |
| 2729 | tracing_ctrl_read(struct file *filp, char __user *ubuf, |
| 2730 | size_t cnt, loff_t *ppos) |
| 2731 | { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2732 | char buf[64]; |
| 2733 | int r; |
| 2734 | |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 2735 | r = sprintf(buf, "%u\n", tracer_enabled); |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2736 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2737 | } |
| 2738 | |
| 2739 | static ssize_t |
| 2740 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, |
| 2741 | size_t cnt, loff_t *ppos) |
| 2742 | { |
| 2743 | struct trace_array *tr = filp->private_data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2744 | char buf[64]; |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2745 | long val; |
| 2746 | int ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2747 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2748 | if (cnt >= sizeof(buf)) |
| 2749 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2750 | |
| 2751 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2752 | return -EFAULT; |
| 2753 | |
| 2754 | buf[cnt] = 0; |
| 2755 | |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2756 | ret = strict_strtoul(buf, 10, &val); |
| 2757 | if (ret < 0) |
| 2758 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2759 | |
| 2760 | val = !!val; |
| 2761 | |
| 2762 | mutex_lock(&trace_types_lock); |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 2763 | if (tracer_enabled ^ val) { |
| 2764 | if (val) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2765 | tracer_enabled = 1; |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 2766 | if (current_trace->start) |
| 2767 | current_trace->start(tr); |
| 2768 | tracing_start(); |
| 2769 | } else { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2770 | tracer_enabled = 0; |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 2771 | tracing_stop(); |
| 2772 | if (current_trace->stop) |
| 2773 | current_trace->stop(tr); |
| 2774 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2775 | } |
| 2776 | mutex_unlock(&trace_types_lock); |
| 2777 | |
| 2778 | filp->f_pos += cnt; |
| 2779 | |
| 2780 | return cnt; |
| 2781 | } |
| 2782 | |
| 2783 | static ssize_t |
| 2784 | tracing_set_trace_read(struct file *filp, char __user *ubuf, |
| 2785 | size_t cnt, loff_t *ppos) |
| 2786 | { |
| 2787 | char buf[max_tracer_type_len+2]; |
| 2788 | int r; |
| 2789 | |
| 2790 | mutex_lock(&trace_types_lock); |
| 2791 | if (current_trace) |
| 2792 | r = sprintf(buf, "%s\n", current_trace->name); |
| 2793 | else |
| 2794 | r = sprintf(buf, "\n"); |
| 2795 | mutex_unlock(&trace_types_lock); |
| 2796 | |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2797 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2798 | } |
| 2799 | |
Peter Zijlstra | d9e5407 | 2008-11-01 19:57:37 +0100 | [diff] [blame] | 2800 | static int tracing_set_tracer(char *buf) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2801 | { |
| 2802 | struct trace_array *tr = &global_trace; |
| 2803 | struct tracer *t; |
Peter Zijlstra | d9e5407 | 2008-11-01 19:57:37 +0100 | [diff] [blame] | 2804 | int ret = 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2805 | |
| 2806 | mutex_lock(&trace_types_lock); |
| 2807 | for (t = trace_types; t; t = t->next) { |
| 2808 | if (strcmp(t->name, buf) == 0) |
| 2809 | break; |
| 2810 | } |
Frederic Weisbecker | c2931e0 | 2008-10-04 22:04:44 +0200 | [diff] [blame] | 2811 | if (!t) { |
| 2812 | ret = -EINVAL; |
| 2813 | goto out; |
| 2814 | } |
| 2815 | if (t == current_trace) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2816 | goto out; |
| 2817 | |
Steven Rostedt | 9f029e8 | 2008-11-12 15:24:24 -0500 | [diff] [blame] | 2818 | trace_branch_disable(); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2819 | if (current_trace && current_trace->reset) |
| 2820 | current_trace->reset(tr); |
| 2821 | |
| 2822 | current_trace = t; |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 2823 | if (t->init) { |
| 2824 | ret = t->init(tr); |
| 2825 | if (ret) |
| 2826 | goto out; |
| 2827 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2828 | |
Steven Rostedt | 9f029e8 | 2008-11-12 15:24:24 -0500 | [diff] [blame] | 2829 | trace_branch_enable(tr); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2830 | out: |
| 2831 | mutex_unlock(&trace_types_lock); |
| 2832 | |
Peter Zijlstra | d9e5407 | 2008-11-01 19:57:37 +0100 | [diff] [blame] | 2833 | return ret; |
| 2834 | } |
| 2835 | |
| 2836 | static ssize_t |
| 2837 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, |
| 2838 | size_t cnt, loff_t *ppos) |
| 2839 | { |
| 2840 | char buf[max_tracer_type_len+1]; |
| 2841 | int i; |
| 2842 | size_t ret; |
Frederic Weisbecker | e6e7a65 | 2008-11-16 05:53:19 +0100 | [diff] [blame] | 2843 | int err; |
| 2844 | |
| 2845 | ret = cnt; |
Peter Zijlstra | d9e5407 | 2008-11-01 19:57:37 +0100 | [diff] [blame] | 2846 | |
| 2847 | if (cnt > max_tracer_type_len) |
| 2848 | cnt = max_tracer_type_len; |
| 2849 | |
| 2850 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2851 | return -EFAULT; |
| 2852 | |
| 2853 | buf[cnt] = 0; |
| 2854 | |
| 2855 | /* strip ending whitespace. */ |
| 2856 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) |
| 2857 | buf[i] = 0; |
| 2858 | |
Frederic Weisbecker | e6e7a65 | 2008-11-16 05:53:19 +0100 | [diff] [blame] | 2859 | err = tracing_set_tracer(buf); |
| 2860 | if (err) |
| 2861 | return err; |
Peter Zijlstra | d9e5407 | 2008-11-01 19:57:37 +0100 | [diff] [blame] | 2862 | |
Frederic Weisbecker | e6e7a65 | 2008-11-16 05:53:19 +0100 | [diff] [blame] | 2863 | filp->f_pos += ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2864 | |
Frederic Weisbecker | c2931e0 | 2008-10-04 22:04:44 +0200 | [diff] [blame] | 2865 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2866 | } |
| 2867 | |
| 2868 | static ssize_t |
| 2869 | tracing_max_lat_read(struct file *filp, char __user *ubuf, |
| 2870 | size_t cnt, loff_t *ppos) |
| 2871 | { |
| 2872 | unsigned long *ptr = filp->private_data; |
| 2873 | char buf[64]; |
| 2874 | int r; |
| 2875 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2876 | r = snprintf(buf, sizeof(buf), "%ld\n", |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2877 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2878 | if (r > sizeof(buf)) |
| 2879 | r = sizeof(buf); |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2880 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2881 | } |
| 2882 | |
| 2883 | static ssize_t |
| 2884 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, |
| 2885 | size_t cnt, loff_t *ppos) |
| 2886 | { |
| 2887 | long *ptr = filp->private_data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2888 | char buf[64]; |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2889 | long val; |
| 2890 | int ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2891 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2892 | if (cnt >= sizeof(buf)) |
| 2893 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2894 | |
| 2895 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2896 | return -EFAULT; |
| 2897 | |
| 2898 | buf[cnt] = 0; |
| 2899 | |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2900 | ret = strict_strtoul(buf, 10, &val); |
| 2901 | if (ret < 0) |
| 2902 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2903 | |
| 2904 | *ptr = val * 1000; |
| 2905 | |
| 2906 | return cnt; |
| 2907 | } |
| 2908 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2909 | static atomic_t tracing_reader; |
| 2910 | |
| 2911 | static int tracing_open_pipe(struct inode *inode, struct file *filp) |
| 2912 | { |
| 2913 | struct trace_iterator *iter; |
| 2914 | |
| 2915 | if (tracing_disabled) |
| 2916 | return -ENODEV; |
| 2917 | |
| 2918 | /* We only allow for reader of the pipe */ |
| 2919 | if (atomic_inc_return(&tracing_reader) != 1) { |
| 2920 | atomic_dec(&tracing_reader); |
| 2921 | return -EBUSY; |
| 2922 | } |
| 2923 | |
| 2924 | /* create a buffer to store the information to pass to userspace */ |
| 2925 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 2926 | if (!iter) |
| 2927 | return -ENOMEM; |
| 2928 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2929 | mutex_lock(&trace_types_lock); |
Steven Rostedt | a309720 | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 2930 | |
| 2931 | /* trace pipe does not show start of buffer */ |
| 2932 | cpus_setall(iter->started); |
| 2933 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2934 | iter->tr = &global_trace; |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 2935 | iter->trace = current_trace; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2936 | filp->private_data = iter; |
| 2937 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2938 | if (iter->trace->pipe_open) |
| 2939 | iter->trace->pipe_open(iter); |
| 2940 | mutex_unlock(&trace_types_lock); |
| 2941 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2942 | return 0; |
| 2943 | } |
| 2944 | |
| 2945 | static int tracing_release_pipe(struct inode *inode, struct file *file) |
| 2946 | { |
| 2947 | struct trace_iterator *iter = file->private_data; |
| 2948 | |
| 2949 | kfree(iter); |
| 2950 | atomic_dec(&tracing_reader); |
| 2951 | |
| 2952 | return 0; |
| 2953 | } |
| 2954 | |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2955 | static unsigned int |
| 2956 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) |
| 2957 | { |
| 2958 | struct trace_iterator *iter = filp->private_data; |
| 2959 | |
| 2960 | if (trace_flags & TRACE_ITER_BLOCK) { |
| 2961 | /* |
| 2962 | * Always select as readable when in blocking mode |
| 2963 | */ |
| 2964 | return POLLIN | POLLRDNORM; |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2965 | } else { |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2966 | if (!trace_empty(iter)) |
| 2967 | return POLLIN | POLLRDNORM; |
| 2968 | poll_wait(filp, &trace_wait, poll_table); |
| 2969 | if (!trace_empty(iter)) |
| 2970 | return POLLIN | POLLRDNORM; |
| 2971 | |
| 2972 | return 0; |
| 2973 | } |
| 2974 | } |
| 2975 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2976 | /* |
| 2977 | * Consumer reader. |
| 2978 | */ |
| 2979 | static ssize_t |
| 2980 | tracing_read_pipe(struct file *filp, char __user *ubuf, |
| 2981 | size_t cnt, loff_t *ppos) |
| 2982 | { |
| 2983 | struct trace_iterator *iter = filp->private_data; |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2984 | ssize_t sret; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2985 | |
| 2986 | /* return any leftover data */ |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2987 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
| 2988 | if (sret != -EBUSY) |
| 2989 | return sret; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2990 | |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2991 | trace_seq_reset(&iter->seq); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2992 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2993 | mutex_lock(&trace_types_lock); |
| 2994 | if (iter->trace->read) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2995 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); |
| 2996 | if (sret) |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2997 | goto out; |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2998 | } |
| 2999 | |
Pekka Paalanen | 9ff4b97 | 2008-09-29 20:23:48 +0200 | [diff] [blame] | 3000 | waitagain: |
| 3001 | sret = 0; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3002 | while (trace_empty(iter)) { |
Steven Rostedt | 2dc8f09 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 3003 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 3004 | if ((filp->f_flags & O_NONBLOCK)) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 3005 | sret = -EAGAIN; |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 3006 | goto out; |
| 3007 | } |
Steven Rostedt | 2dc8f09 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 3008 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3009 | /* |
| 3010 | * This is a make-shift waitqueue. The reason we don't use |
| 3011 | * an actual wait queue is because: |
| 3012 | * 1) we only ever have one waiter |
| 3013 | * 2) the tracing, traces all functions, we don't want |
| 3014 | * the overhead of calling wake_up and friends |
| 3015 | * (and tracing them too) |
| 3016 | * Anyway, this is really very primitive wakeup. |
| 3017 | */ |
| 3018 | set_current_state(TASK_INTERRUPTIBLE); |
| 3019 | iter->tr->waiter = current; |
| 3020 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 3021 | mutex_unlock(&trace_types_lock); |
| 3022 | |
Ingo Molnar | 9fe068e | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 3023 | /* sleep for 100 msecs, and try again. */ |
| 3024 | schedule_timeout(HZ/10); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3025 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 3026 | mutex_lock(&trace_types_lock); |
| 3027 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3028 | iter->tr->waiter = NULL; |
| 3029 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 3030 | if (signal_pending(current)) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 3031 | sret = -EINTR; |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 3032 | goto out; |
| 3033 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3034 | |
Steven Rostedt | 8452799 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 3035 | if (iter->trace != current_trace) |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 3036 | goto out; |
Steven Rostedt | 8452799 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 3037 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3038 | /* |
| 3039 | * We block until we read something and tracing is disabled. |
| 3040 | * We still block if tracing is disabled, but we have never |
| 3041 | * read anything. This allows a user to cat this file, and |
| 3042 | * then enable tracing. But after we have read something, |
| 3043 | * we give an EOF when tracing is again disabled. |
| 3044 | * |
| 3045 | * iter->pos will be 0 if we haven't read anything. |
| 3046 | */ |
| 3047 | if (!tracer_enabled && iter->pos) |
| 3048 | break; |
| 3049 | |
| 3050 | continue; |
| 3051 | } |
| 3052 | |
| 3053 | /* stop when tracing is finished */ |
| 3054 | if (trace_empty(iter)) |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 3055 | goto out; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3056 | |
| 3057 | if (cnt >= PAGE_SIZE) |
| 3058 | cnt = PAGE_SIZE - 1; |
| 3059 | |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 3060 | /* reset all but tr, trace, and overruns */ |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 3061 | memset(&iter->seq, 0, |
| 3062 | sizeof(struct trace_iterator) - |
| 3063 | offsetof(struct trace_iterator, seq)); |
Steven Rostedt | 4823ed7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 3064 | iter->pos = -1; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3065 | |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 3066 | while (find_next_entry_inc(iter) != NULL) { |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 3067 | enum print_line_t ret; |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 3068 | int len = iter->seq.len; |
| 3069 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 3070 | ret = print_trace_line(iter); |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 3071 | if (ret == TRACE_TYPE_PARTIAL_LINE) { |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 3072 | /* don't print partial lines */ |
| 3073 | iter->seq.len = len; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3074 | break; |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 3075 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3076 | |
| 3077 | trace_consume(iter); |
| 3078 | |
| 3079 | if (iter->seq.len >= cnt) |
| 3080 | break; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3081 | } |
| 3082 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3083 | /* Now copy what we have to the user */ |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 3084 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
| 3085 | if (iter->seq.readpos >= iter->seq.len) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3086 | trace_seq_reset(&iter->seq); |
Pekka Paalanen | 9ff4b97 | 2008-09-29 20:23:48 +0200 | [diff] [blame] | 3087 | |
| 3088 | /* |
| 3089 | * If there was nothing to send to user, inspite of consuming trace |
| 3090 | * entries, go back to wait for more entries. |
| 3091 | */ |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 3092 | if (sret == -EBUSY) |
Pekka Paalanen | 9ff4b97 | 2008-09-29 20:23:48 +0200 | [diff] [blame] | 3093 | goto waitagain; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3094 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 3095 | out: |
| 3096 | mutex_unlock(&trace_types_lock); |
| 3097 | |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 3098 | return sret; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3099 | } |
| 3100 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3101 | static ssize_t |
| 3102 | tracing_entries_read(struct file *filp, char __user *ubuf, |
| 3103 | size_t cnt, loff_t *ppos) |
| 3104 | { |
| 3105 | struct trace_array *tr = filp->private_data; |
| 3106 | char buf[64]; |
| 3107 | int r; |
| 3108 | |
Steven Rostedt | 1696b2b | 2008-11-13 00:09:35 -0500 | [diff] [blame] | 3109 | r = sprintf(buf, "%lu\n", tr->entries >> 10); |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3110 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
| 3111 | } |
| 3112 | |
| 3113 | static ssize_t |
| 3114 | tracing_entries_write(struct file *filp, const char __user *ubuf, |
| 3115 | size_t cnt, loff_t *ppos) |
| 3116 | { |
| 3117 | unsigned long val; |
| 3118 | char buf[64]; |
Steven Rostedt | bf5e651 | 2008-11-10 21:46:00 -0500 | [diff] [blame] | 3119 | int ret, cpu; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3120 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 3121 | if (cnt >= sizeof(buf)) |
| 3122 | return -EINVAL; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3123 | |
| 3124 | if (copy_from_user(&buf, ubuf, cnt)) |
| 3125 | return -EFAULT; |
| 3126 | |
| 3127 | buf[cnt] = 0; |
| 3128 | |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 3129 | ret = strict_strtoul(buf, 10, &val); |
| 3130 | if (ret < 0) |
| 3131 | return ret; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3132 | |
| 3133 | /* must have at least 1 entry */ |
| 3134 | if (!val) |
| 3135 | return -EINVAL; |
| 3136 | |
| 3137 | mutex_lock(&trace_types_lock); |
| 3138 | |
Steven Rostedt | c76f069 | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 3139 | tracing_stop(); |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3140 | |
Steven Rostedt | bf5e651 | 2008-11-10 21:46:00 -0500 | [diff] [blame] | 3141 | /* disable all cpu buffers */ |
| 3142 | for_each_tracing_cpu(cpu) { |
| 3143 | if (global_trace.data[cpu]) |
| 3144 | atomic_inc(&global_trace.data[cpu]->disabled); |
| 3145 | if (max_tr.data[cpu]) |
| 3146 | atomic_inc(&max_tr.data[cpu]->disabled); |
| 3147 | } |
| 3148 | |
Steven Rostedt | 1696b2b | 2008-11-13 00:09:35 -0500 | [diff] [blame] | 3149 | /* value is in KB */ |
| 3150 | val <<= 10; |
| 3151 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3152 | if (val != global_trace.entries) { |
| 3153 | ret = ring_buffer_resize(global_trace.buffer, val); |
| 3154 | if (ret < 0) { |
| 3155 | cnt = ret; |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 3156 | goto out; |
| 3157 | } |
| 3158 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3159 | ret = ring_buffer_resize(max_tr.buffer, val); |
| 3160 | if (ret < 0) { |
| 3161 | int r; |
| 3162 | cnt = ret; |
| 3163 | r = ring_buffer_resize(global_trace.buffer, |
| 3164 | global_trace.entries); |
| 3165 | if (r < 0) { |
| 3166 | /* AARGH! We are left with different |
| 3167 | * size max buffer!!!! */ |
| 3168 | WARN_ON(1); |
| 3169 | tracing_disabled = 1; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3170 | } |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3171 | goto out; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3172 | } |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 3173 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3174 | global_trace.entries = val; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3175 | } |
| 3176 | |
| 3177 | filp->f_pos += cnt; |
| 3178 | |
Steven Rostedt | 19384c0 | 2008-05-22 00:22:16 -0400 | [diff] [blame] | 3179 | /* If check pages failed, return ENOMEM */ |
| 3180 | if (tracing_disabled) |
| 3181 | cnt = -ENOMEM; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3182 | out: |
Steven Rostedt | bf5e651 | 2008-11-10 21:46:00 -0500 | [diff] [blame] | 3183 | for_each_tracing_cpu(cpu) { |
| 3184 | if (global_trace.data[cpu]) |
| 3185 | atomic_dec(&global_trace.data[cpu]->disabled); |
| 3186 | if (max_tr.data[cpu]) |
| 3187 | atomic_dec(&max_tr.data[cpu]->disabled); |
| 3188 | } |
| 3189 | |
Steven Rostedt | c76f069 | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 3190 | tracing_start(); |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3191 | max_tr.entries = global_trace.entries; |
| 3192 | mutex_unlock(&trace_types_lock); |
| 3193 | |
| 3194 | return cnt; |
| 3195 | } |
| 3196 | |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 3197 | static int mark_printk(const char *fmt, ...) |
| 3198 | { |
| 3199 | int ret; |
| 3200 | va_list args; |
| 3201 | va_start(args, fmt); |
| 3202 | ret = trace_vprintk(0, fmt, args); |
| 3203 | va_end(args); |
| 3204 | return ret; |
| 3205 | } |
| 3206 | |
| 3207 | static ssize_t |
| 3208 | tracing_mark_write(struct file *filp, const char __user *ubuf, |
| 3209 | size_t cnt, loff_t *fpos) |
| 3210 | { |
| 3211 | char *buf; |
| 3212 | char *end; |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 3213 | |
Steven Rostedt | c76f069 | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 3214 | if (tracing_disabled) |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 3215 | return -EINVAL; |
| 3216 | |
| 3217 | if (cnt > TRACE_BUF_SIZE) |
| 3218 | cnt = TRACE_BUF_SIZE; |
| 3219 | |
| 3220 | buf = kmalloc(cnt + 1, GFP_KERNEL); |
| 3221 | if (buf == NULL) |
| 3222 | return -ENOMEM; |
| 3223 | |
| 3224 | if (copy_from_user(buf, ubuf, cnt)) { |
| 3225 | kfree(buf); |
| 3226 | return -EFAULT; |
| 3227 | } |
| 3228 | |
| 3229 | /* Cut from the first nil or newline. */ |
| 3230 | buf[cnt] = '\0'; |
| 3231 | end = strchr(buf, '\n'); |
| 3232 | if (end) |
| 3233 | *end = '\0'; |
| 3234 | |
| 3235 | cnt = mark_printk("%s\n", buf); |
| 3236 | kfree(buf); |
| 3237 | *fpos += cnt; |
| 3238 | |
| 3239 | return cnt; |
| 3240 | } |
| 3241 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3242 | static struct file_operations tracing_max_lat_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3243 | .open = tracing_open_generic, |
| 3244 | .read = tracing_max_lat_read, |
| 3245 | .write = tracing_max_lat_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3246 | }; |
| 3247 | |
| 3248 | static struct file_operations tracing_ctrl_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3249 | .open = tracing_open_generic, |
| 3250 | .read = tracing_ctrl_read, |
| 3251 | .write = tracing_ctrl_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3252 | }; |
| 3253 | |
| 3254 | static struct file_operations set_tracer_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3255 | .open = tracing_open_generic, |
| 3256 | .read = tracing_set_trace_read, |
| 3257 | .write = tracing_set_trace_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3258 | }; |
| 3259 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3260 | static struct file_operations tracing_pipe_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3261 | .open = tracing_open_pipe, |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 3262 | .poll = tracing_poll_pipe, |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3263 | .read = tracing_read_pipe, |
| 3264 | .release = tracing_release_pipe, |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3265 | }; |
| 3266 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3267 | static struct file_operations tracing_entries_fops = { |
| 3268 | .open = tracing_open_generic, |
| 3269 | .read = tracing_entries_read, |
| 3270 | .write = tracing_entries_write, |
| 3271 | }; |
| 3272 | |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 3273 | static struct file_operations tracing_mark_fops = { |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 3274 | .open = tracing_open_generic, |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 3275 | .write = tracing_mark_write, |
| 3276 | }; |
| 3277 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3278 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 3279 | |
Steven Rostedt | b807c3d | 2008-10-30 16:08:33 -0400 | [diff] [blame] | 3280 | int __weak ftrace_arch_read_dyn_info(char *buf, int size) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3281 | { |
Steven Rostedt | b807c3d | 2008-10-30 16:08:33 -0400 | [diff] [blame] | 3282 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3283 | } |
| 3284 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3285 | static ssize_t |
Steven Rostedt | b807c3d | 2008-10-30 16:08:33 -0400 | [diff] [blame] | 3286 | tracing_read_dyn_info(struct file *filp, char __user *ubuf, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3287 | size_t cnt, loff_t *ppos) |
| 3288 | { |
Steven Rostedt | a26a2a2 | 2008-10-31 00:03:22 -0400 | [diff] [blame] | 3289 | static char ftrace_dyn_info_buffer[1024]; |
| 3290 | static DEFINE_MUTEX(dyn_info_mutex); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3291 | unsigned long *p = filp->private_data; |
Steven Rostedt | b807c3d | 2008-10-30 16:08:33 -0400 | [diff] [blame] | 3292 | char *buf = ftrace_dyn_info_buffer; |
Steven Rostedt | a26a2a2 | 2008-10-31 00:03:22 -0400 | [diff] [blame] | 3293 | int size = ARRAY_SIZE(ftrace_dyn_info_buffer); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3294 | int r; |
| 3295 | |
Steven Rostedt | b807c3d | 2008-10-30 16:08:33 -0400 | [diff] [blame] | 3296 | mutex_lock(&dyn_info_mutex); |
| 3297 | r = sprintf(buf, "%ld ", *p); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3298 | |
Steven Rostedt | a26a2a2 | 2008-10-31 00:03:22 -0400 | [diff] [blame] | 3299 | r += ftrace_arch_read_dyn_info(buf+r, (size-1)-r); |
Steven Rostedt | b807c3d | 2008-10-30 16:08:33 -0400 | [diff] [blame] | 3300 | buf[r++] = '\n'; |
| 3301 | |
| 3302 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
| 3303 | |
| 3304 | mutex_unlock(&dyn_info_mutex); |
| 3305 | |
| 3306 | return r; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3307 | } |
| 3308 | |
Steven Rostedt | b807c3d | 2008-10-30 16:08:33 -0400 | [diff] [blame] | 3309 | static struct file_operations tracing_dyn_info_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3310 | .open = tracing_open_generic, |
Steven Rostedt | b807c3d | 2008-10-30 16:08:33 -0400 | [diff] [blame] | 3311 | .read = tracing_read_dyn_info, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3312 | }; |
| 3313 | #endif |
| 3314 | |
| 3315 | static struct dentry *d_tracer; |
| 3316 | |
| 3317 | struct dentry *tracing_init_dentry(void) |
| 3318 | { |
| 3319 | static int once; |
| 3320 | |
| 3321 | if (d_tracer) |
| 3322 | return d_tracer; |
| 3323 | |
| 3324 | d_tracer = debugfs_create_dir("tracing", NULL); |
| 3325 | |
| 3326 | if (!d_tracer && !once) { |
| 3327 | once = 1; |
| 3328 | pr_warning("Could not create debugfs directory 'tracing'\n"); |
| 3329 | return NULL; |
| 3330 | } |
| 3331 | |
| 3332 | return d_tracer; |
| 3333 | } |
| 3334 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 3335 | #ifdef CONFIG_FTRACE_SELFTEST |
| 3336 | /* Let selftest have access to static functions in this file */ |
| 3337 | #include "trace_selftest.c" |
| 3338 | #endif |
| 3339 | |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame] | 3340 | static __init int tracer_init_debugfs(void) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3341 | { |
| 3342 | struct dentry *d_tracer; |
| 3343 | struct dentry *entry; |
| 3344 | |
| 3345 | d_tracer = tracing_init_dentry(); |
| 3346 | |
| 3347 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, |
| 3348 | &global_trace, &tracing_ctrl_fops); |
| 3349 | if (!entry) |
| 3350 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); |
| 3351 | |
Steven Rostedt | ee6bce5 | 2008-11-12 17:52:37 -0500 | [diff] [blame] | 3352 | entry = debugfs_create_file("trace_options", 0644, d_tracer, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3353 | NULL, &tracing_iter_fops); |
| 3354 | if (!entry) |
Steven Rostedt | ee6bce5 | 2008-11-12 17:52:37 -0500 | [diff] [blame] | 3355 | pr_warning("Could not create debugfs 'trace_options' entry\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3356 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 3357 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
| 3358 | NULL, &tracing_cpumask_fops); |
| 3359 | if (!entry) |
| 3360 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); |
| 3361 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3362 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
| 3363 | &global_trace, &tracing_lt_fops); |
| 3364 | if (!entry) |
| 3365 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); |
| 3366 | |
| 3367 | entry = debugfs_create_file("trace", 0444, d_tracer, |
| 3368 | &global_trace, &tracing_fops); |
| 3369 | if (!entry) |
| 3370 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 3371 | |
| 3372 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, |
| 3373 | &global_trace, &show_traces_fops); |
| 3374 | if (!entry) |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 3375 | pr_warning("Could not create debugfs 'available_tracers' entry\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3376 | |
| 3377 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, |
| 3378 | &global_trace, &set_tracer_fops); |
| 3379 | if (!entry) |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 3380 | pr_warning("Could not create debugfs 'current_tracer' entry\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3381 | |
| 3382 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, |
| 3383 | &tracing_max_latency, |
| 3384 | &tracing_max_lat_fops); |
| 3385 | if (!entry) |
| 3386 | pr_warning("Could not create debugfs " |
| 3387 | "'tracing_max_latency' entry\n"); |
| 3388 | |
| 3389 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, |
| 3390 | &tracing_thresh, &tracing_max_lat_fops); |
| 3391 | if (!entry) |
| 3392 | pr_warning("Could not create debugfs " |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 3393 | "'tracing_thresh' entry\n"); |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3394 | entry = debugfs_create_file("README", 0644, d_tracer, |
| 3395 | NULL, &tracing_readme_fops); |
| 3396 | if (!entry) |
| 3397 | pr_warning("Could not create debugfs 'README' entry\n"); |
| 3398 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3399 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
| 3400 | NULL, &tracing_pipe_fops); |
| 3401 | if (!entry) |
| 3402 | pr_warning("Could not create debugfs " |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 3403 | "'trace_pipe' entry\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3404 | |
Steven Rostedt | a94c80e | 2008-11-12 17:52:36 -0500 | [diff] [blame] | 3405 | entry = debugfs_create_file("buffer_size_kb", 0644, d_tracer, |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3406 | &global_trace, &tracing_entries_fops); |
| 3407 | if (!entry) |
| 3408 | pr_warning("Could not create debugfs " |
Steven Rostedt | a94c80e | 2008-11-12 17:52:36 -0500 | [diff] [blame] | 3409 | "'buffer_size_kb' entry\n"); |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3410 | |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 3411 | entry = debugfs_create_file("trace_marker", 0220, d_tracer, |
| 3412 | NULL, &tracing_mark_fops); |
| 3413 | if (!entry) |
| 3414 | pr_warning("Could not create debugfs " |
| 3415 | "'trace_marker' entry\n"); |
| 3416 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3417 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 3418 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, |
| 3419 | &ftrace_update_tot_cnt, |
Steven Rostedt | b807c3d | 2008-10-30 16:08:33 -0400 | [diff] [blame] | 3420 | &tracing_dyn_info_fops); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3421 | if (!entry) |
| 3422 | pr_warning("Could not create debugfs " |
| 3423 | "'dyn_ftrace_total_info' entry\n"); |
| 3424 | #endif |
Ingo Molnar | d618b3e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 3425 | #ifdef CONFIG_SYSPROF_TRACER |
| 3426 | init_tracer_sysprof_debugfs(d_tracer); |
| 3427 | #endif |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame] | 3428 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3429 | } |
| 3430 | |
Pekka Paalanen | 801fe40 | 2008-09-16 21:58:24 +0300 | [diff] [blame] | 3431 | int trace_vprintk(unsigned long ip, const char *fmt, va_list args) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3432 | { |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3433 | static DEFINE_SPINLOCK(trace_buf_lock); |
| 3434 | static char trace_buf[TRACE_BUF_SIZE]; |
Peter Zijlstra | f09ce57 | 2008-09-04 10:24:14 +0200 | [diff] [blame] | 3435 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3436 | struct ring_buffer_event *event; |
Peter Zijlstra | f09ce57 | 2008-09-04 10:24:14 +0200 | [diff] [blame] | 3437 | struct trace_array *tr = &global_trace; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3438 | struct trace_array_cpu *data; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 3439 | struct print_entry *entry; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3440 | unsigned long flags, irq_flags; |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 3441 | int cpu, len = 0, size, pc; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3442 | |
Steven Rostedt | c76f069 | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 3443 | if (tracing_disabled) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3444 | return 0; |
| 3445 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 3446 | pc = preempt_count(); |
| 3447 | preempt_disable_notrace(); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3448 | cpu = raw_smp_processor_id(); |
| 3449 | data = tr->data[cpu]; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3450 | |
Steven Rostedt | 3ea2e6d | 2008-10-04 02:01:00 -0400 | [diff] [blame] | 3451 | if (unlikely(atomic_read(&data->disabled))) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3452 | goto out; |
| 3453 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 3454 | spin_lock_irqsave(&trace_buf_lock, flags); |
Pekka Paalanen | 801fe40 | 2008-09-16 21:58:24 +0300 | [diff] [blame] | 3455 | len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3456 | |
| 3457 | len = min(len, TRACE_BUF_SIZE-1); |
| 3458 | trace_buf[len] = 0; |
| 3459 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 3460 | size = sizeof(*entry) + len + 1; |
| 3461 | event = ring_buffer_lock_reserve(tr->buffer, size, &irq_flags); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3462 | if (!event) |
| 3463 | goto out_unlock; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 3464 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 3465 | tracing_generic_entry_update(&entry->ent, flags, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 3466 | entry->ent.type = TRACE_PRINT; |
| 3467 | entry->ip = ip; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3468 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 3469 | memcpy(&entry->buf, trace_buf, len); |
| 3470 | entry->buf[len] = 0; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3471 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3472 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3473 | out_unlock: |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 3474 | spin_unlock_irqrestore(&trace_buf_lock, flags); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3475 | |
| 3476 | out: |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 3477 | preempt_enable_notrace(); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3478 | |
| 3479 | return len; |
| 3480 | } |
Pekka Paalanen | 801fe40 | 2008-09-16 21:58:24 +0300 | [diff] [blame] | 3481 | EXPORT_SYMBOL_GPL(trace_vprintk); |
| 3482 | |
| 3483 | int __ftrace_printk(unsigned long ip, const char *fmt, ...) |
| 3484 | { |
| 3485 | int ret; |
| 3486 | va_list ap; |
| 3487 | |
| 3488 | if (!(trace_flags & TRACE_ITER_PRINTK)) |
| 3489 | return 0; |
| 3490 | |
| 3491 | va_start(ap, fmt); |
| 3492 | ret = trace_vprintk(ip, fmt, ap); |
| 3493 | va_end(ap); |
| 3494 | return ret; |
| 3495 | } |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3496 | EXPORT_SYMBOL_GPL(__ftrace_printk); |
| 3497 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3498 | static int trace_panic_handler(struct notifier_block *this, |
| 3499 | unsigned long event, void *unused) |
| 3500 | { |
Steven Rostedt | 944ac42 | 2008-10-23 19:26:08 -0400 | [diff] [blame] | 3501 | if (ftrace_dump_on_oops) |
| 3502 | ftrace_dump(); |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3503 | return NOTIFY_OK; |
| 3504 | } |
| 3505 | |
| 3506 | static struct notifier_block trace_panic_notifier = { |
| 3507 | .notifier_call = trace_panic_handler, |
| 3508 | .next = NULL, |
| 3509 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ |
| 3510 | }; |
| 3511 | |
| 3512 | static int trace_die_handler(struct notifier_block *self, |
| 3513 | unsigned long val, |
| 3514 | void *data) |
| 3515 | { |
| 3516 | switch (val) { |
| 3517 | case DIE_OOPS: |
Steven Rostedt | 944ac42 | 2008-10-23 19:26:08 -0400 | [diff] [blame] | 3518 | if (ftrace_dump_on_oops) |
| 3519 | ftrace_dump(); |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3520 | break; |
| 3521 | default: |
| 3522 | break; |
| 3523 | } |
| 3524 | return NOTIFY_OK; |
| 3525 | } |
| 3526 | |
| 3527 | static struct notifier_block trace_die_notifier = { |
| 3528 | .notifier_call = trace_die_handler, |
| 3529 | .priority = 200 |
| 3530 | }; |
| 3531 | |
| 3532 | /* |
| 3533 | * printk is set to max of 1024, we really don't need it that big. |
| 3534 | * Nothing should be printing 1000 characters anyway. |
| 3535 | */ |
| 3536 | #define TRACE_MAX_PRINT 1000 |
| 3537 | |
| 3538 | /* |
| 3539 | * Define here KERN_TRACE so that we have one place to modify |
| 3540 | * it if we decide to change what log level the ftrace dump |
| 3541 | * should be at. |
| 3542 | */ |
| 3543 | #define KERN_TRACE KERN_INFO |
| 3544 | |
| 3545 | static void |
| 3546 | trace_printk_seq(struct trace_seq *s) |
| 3547 | { |
| 3548 | /* Probably should print a warning here. */ |
| 3549 | if (s->len >= 1000) |
| 3550 | s->len = 1000; |
| 3551 | |
| 3552 | /* should be zero ended, but we are paranoid. */ |
| 3553 | s->buffer[s->len] = 0; |
| 3554 | |
| 3555 | printk(KERN_TRACE "%s", s->buffer); |
| 3556 | |
| 3557 | trace_seq_reset(s); |
| 3558 | } |
| 3559 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3560 | void ftrace_dump(void) |
| 3561 | { |
| 3562 | static DEFINE_SPINLOCK(ftrace_dump_lock); |
| 3563 | /* use static because iter can be a bit big for the stack */ |
| 3564 | static struct trace_iterator iter; |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3565 | static cpumask_t mask; |
| 3566 | static int dump_ran; |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 3567 | unsigned long flags; |
| 3568 | int cnt = 0, cpu; |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3569 | |
| 3570 | /* only one dump */ |
| 3571 | spin_lock_irqsave(&ftrace_dump_lock, flags); |
| 3572 | if (dump_ran) |
| 3573 | goto out; |
| 3574 | |
| 3575 | dump_ran = 1; |
| 3576 | |
| 3577 | /* No turning back! */ |
Steven Rostedt | 81adbdc | 2008-10-23 09:33:02 -0400 | [diff] [blame] | 3578 | ftrace_kill(); |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3579 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 3580 | for_each_tracing_cpu(cpu) { |
| 3581 | atomic_inc(&global_trace.data[cpu]->disabled); |
| 3582 | } |
| 3583 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3584 | printk(KERN_TRACE "Dumping ftrace buffer:\n"); |
| 3585 | |
| 3586 | iter.tr = &global_trace; |
| 3587 | iter.trace = current_trace; |
| 3588 | |
| 3589 | /* |
| 3590 | * We need to stop all tracing on all CPUS to read the |
| 3591 | * the next buffer. This is a bit expensive, but is |
| 3592 | * not done often. We fill all what we can read, |
| 3593 | * and then release the locks again. |
| 3594 | */ |
| 3595 | |
| 3596 | cpus_clear(mask); |
| 3597 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3598 | while (!trace_empty(&iter)) { |
| 3599 | |
| 3600 | if (!cnt) |
| 3601 | printk(KERN_TRACE "---------------------------------\n"); |
| 3602 | |
| 3603 | cnt++; |
| 3604 | |
| 3605 | /* reset all but tr, trace, and overruns */ |
| 3606 | memset(&iter.seq, 0, |
| 3607 | sizeof(struct trace_iterator) - |
| 3608 | offsetof(struct trace_iterator, seq)); |
| 3609 | iter.iter_flags |= TRACE_FILE_LAT_FMT; |
| 3610 | iter.pos = -1; |
| 3611 | |
| 3612 | if (find_next_entry_inc(&iter) != NULL) { |
| 3613 | print_trace_line(&iter); |
| 3614 | trace_consume(&iter); |
| 3615 | } |
| 3616 | |
| 3617 | trace_printk_seq(&iter.seq); |
| 3618 | } |
| 3619 | |
| 3620 | if (!cnt) |
| 3621 | printk(KERN_TRACE " (ftrace buffer empty)\n"); |
| 3622 | else |
| 3623 | printk(KERN_TRACE "---------------------------------\n"); |
| 3624 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3625 | out: |
| 3626 | spin_unlock_irqrestore(&ftrace_dump_lock, flags); |
| 3627 | } |
| 3628 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3629 | __init static int tracer_alloc_buffers(void) |
| 3630 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3631 | struct trace_array_cpu *data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3632 | int i; |
| 3633 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 3634 | /* TODO: make the number of buffers hot pluggable with CPUS */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 3635 | tracing_buffer_mask = cpu_possible_map; |
| 3636 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3637 | global_trace.buffer = ring_buffer_alloc(trace_buf_size, |
| 3638 | TRACE_BUFFER_FLAGS); |
| 3639 | if (!global_trace.buffer) { |
| 3640 | printk(KERN_ERR "tracer: failed to allocate ring buffer!\n"); |
| 3641 | WARN_ON(1); |
| 3642 | return 0; |
| 3643 | } |
| 3644 | global_trace.entries = ring_buffer_size(global_trace.buffer); |
| 3645 | |
| 3646 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 3647 | max_tr.buffer = ring_buffer_alloc(trace_buf_size, |
| 3648 | TRACE_BUFFER_FLAGS); |
| 3649 | if (!max_tr.buffer) { |
| 3650 | printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n"); |
| 3651 | WARN_ON(1); |
| 3652 | ring_buffer_free(global_trace.buffer); |
| 3653 | return 0; |
| 3654 | } |
| 3655 | max_tr.entries = ring_buffer_size(max_tr.buffer); |
| 3656 | WARN_ON(max_tr.entries != global_trace.entries); |
| 3657 | #endif |
| 3658 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3659 | /* Allocate the first page for all buffers */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 3660 | for_each_tracing_cpu(i) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3661 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3662 | max_tr.data[i] = &per_cpu(max_data, i); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3663 | } |
| 3664 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3665 | trace_init_cmdlines(); |
| 3666 | |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 3667 | register_tracer(&nop_trace); |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame] | 3668 | #ifdef CONFIG_BOOT_TRACER |
| 3669 | register_tracer(&boot_tracer); |
| 3670 | current_trace = &boot_tracer; |
| 3671 | current_trace->init(&global_trace); |
| 3672 | #else |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 3673 | current_trace = &nop_trace; |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame] | 3674 | #endif |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3675 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 3676 | /* All seems OK, enable tracing */ |
| 3677 | tracing_disabled = 0; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3678 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3679 | atomic_notifier_chain_register(&panic_notifier_list, |
| 3680 | &trace_panic_notifier); |
| 3681 | |
| 3682 | register_die_notifier(&trace_die_notifier); |
| 3683 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3684 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3685 | } |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame] | 3686 | early_initcall(tracer_alloc_buffers); |
| 3687 | fs_initcall(tracer_init_debugfs); |