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 | |
Steven Rostedt | 0f04870 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 46 | |
| 47 | /* |
| 48 | * Kill all tracing for good (never come back). |
| 49 | * It is initialized to 1 but will turn to zero if the initialization |
| 50 | * of the tracer is successful. But that is the only place that sets |
| 51 | * this back to zero. |
| 52 | */ |
| 53 | int tracing_disabled = 1; |
| 54 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 55 | static DEFINE_PER_CPU(local_t, ftrace_cpu_disabled); |
| 56 | |
| 57 | static inline void ftrace_disable_cpu(void) |
| 58 | { |
| 59 | preempt_disable(); |
| 60 | local_inc(&__get_cpu_var(ftrace_cpu_disabled)); |
| 61 | } |
| 62 | |
| 63 | static inline void ftrace_enable_cpu(void) |
| 64 | { |
| 65 | local_dec(&__get_cpu_var(ftrace_cpu_disabled)); |
| 66 | preempt_enable(); |
| 67 | } |
| 68 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 69 | static cpumask_t __read_mostly tracing_buffer_mask; |
| 70 | |
| 71 | #define for_each_tracing_cpu(cpu) \ |
| 72 | for_each_cpu_mask(cpu, tracing_buffer_mask) |
| 73 | |
Steven Rostedt | 944ac42 | 2008-10-23 19:26:08 -0400 | [diff] [blame] | 74 | /* |
| 75 | * ftrace_dump_on_oops - variable to dump ftrace buffer on oops |
| 76 | * |
| 77 | * If there is an oops (or kernel panic) and the ftrace_dump_on_oops |
| 78 | * is set, then ftrace_dump is called. This will output the contents |
| 79 | * of the ftrace buffers to the console. This is very useful for |
| 80 | * capturing traces that lead to crashes and outputing it to a |
| 81 | * serial console. |
| 82 | * |
| 83 | * It is default off, but you can enable it with either specifying |
| 84 | * "ftrace_dump_on_oops" in the kernel command line, or setting |
| 85 | * /proc/sys/kernel/ftrace_dump_on_oops to true. |
| 86 | */ |
| 87 | int ftrace_dump_on_oops; |
| 88 | |
Peter Zijlstra | d9e5407 | 2008-11-01 19:57:37 +0100 | [diff] [blame] | 89 | static int tracing_set_tracer(char *buf); |
| 90 | |
| 91 | static int __init set_ftrace(char *str) |
| 92 | { |
| 93 | tracing_set_tracer(str); |
| 94 | return 1; |
| 95 | } |
| 96 | __setup("ftrace", set_ftrace); |
| 97 | |
Steven Rostedt | 944ac42 | 2008-10-23 19:26:08 -0400 | [diff] [blame] | 98 | static int __init set_ftrace_dump_on_oops(char *str) |
| 99 | { |
| 100 | ftrace_dump_on_oops = 1; |
| 101 | return 1; |
| 102 | } |
| 103 | __setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops); |
| 104 | |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 105 | long |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 106 | ns2usecs(cycle_t nsec) |
| 107 | { |
| 108 | nsec += 500; |
| 109 | do_div(nsec, 1000); |
| 110 | return nsec; |
| 111 | } |
| 112 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 113 | cycle_t ftrace_now(int cpu) |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 114 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 115 | u64 ts = ring_buffer_time_stamp(cpu); |
| 116 | ring_buffer_normalize_time_stamp(cpu, &ts); |
| 117 | return ts; |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 118 | } |
| 119 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 120 | /* |
| 121 | * The global_trace is the descriptor that holds the tracing |
| 122 | * buffers for the live tracing. For each CPU, it contains |
| 123 | * a link list of pages that will store trace entries. The |
| 124 | * page descriptor of the pages in the memory is used to hold |
| 125 | * the link list by linking the lru item in the page descriptor |
| 126 | * to each of the pages in the buffer per CPU. |
| 127 | * |
| 128 | * For each active CPU there is a data field that holds the |
| 129 | * pages for the buffer for that CPU. Each CPU has the same number |
| 130 | * of pages allocated for its buffer. |
| 131 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 132 | static struct trace_array global_trace; |
| 133 | |
| 134 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); |
| 135 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 136 | /* |
| 137 | * The max_tr is used to snapshot the global_trace when a maximum |
| 138 | * latency is reached. Some tracers will use this to store a maximum |
| 139 | * trace while it continues examining live traces. |
| 140 | * |
| 141 | * The buffers for the max_tr are set up the same as the global_trace. |
| 142 | * When a snapshot is taken, the link list of the max_tr is swapped |
| 143 | * with the link list of the global_trace and the buffers are reset for |
| 144 | * the global_trace so the tracing can continue. |
| 145 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 146 | static struct trace_array max_tr; |
| 147 | |
| 148 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); |
| 149 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 150 | /* tracer_enabled is used to toggle activation of a tracer */ |
Steven Rostedt | 26994ea | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 151 | static int tracer_enabled = 1; |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 152 | |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 153 | /** |
| 154 | * tracing_is_enabled - return tracer_enabled status |
| 155 | * |
| 156 | * This function is used by other tracers to know the status |
| 157 | * of the tracer_enabled flag. Tracers may use this function |
| 158 | * to know if it should enable their features when starting |
| 159 | * up. See irqsoff tracer for an example (start_irqsoff_tracer). |
| 160 | */ |
| 161 | int tracing_is_enabled(void) |
| 162 | { |
| 163 | return tracer_enabled; |
| 164 | } |
| 165 | |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 166 | /* function tracing enabled */ |
| 167 | int ftrace_function_enabled; |
| 168 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 169 | /* |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 170 | * trace_buf_size is the size in bytes that is allocated |
| 171 | * for a buffer. Note, the number of bytes is always rounded |
| 172 | * to page size. |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 173 | * |
| 174 | * This number is purposely set to a low number of 16384. |
| 175 | * If the dump on oops happens, it will be much appreciated |
| 176 | * to not have to wait for all that output. Anyway this can be |
| 177 | * boot time and run time configurable. |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 178 | */ |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 179 | #define TRACE_BUF_SIZE_DEFAULT 1441792UL /* 16384 * 88 (sizeof(entry)) */ |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 180 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 181 | static unsigned long trace_buf_size = TRACE_BUF_SIZE_DEFAULT; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 182 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 183 | /* trace_types holds a link list of available tracers. */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 184 | static struct tracer *trace_types __read_mostly; |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 185 | |
| 186 | /* current_trace points to the tracer that is currently active */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 187 | static struct tracer *current_trace __read_mostly; |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 188 | |
| 189 | /* |
| 190 | * max_tracer_type_len is used to simplify the allocating of |
| 191 | * buffers to read userspace tracer names. We keep track of |
| 192 | * the longest tracer name registered. |
| 193 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 194 | static int max_tracer_type_len; |
| 195 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 196 | /* |
| 197 | * trace_types_lock is used to protect the trace_types list. |
| 198 | * This lock is also used to keep user access serialized. |
| 199 | * Accesses from userspace will grab this lock while userspace |
| 200 | * activities happen inside the kernel. |
| 201 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 202 | static DEFINE_MUTEX(trace_types_lock); |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 203 | |
| 204 | /* trace_wait is a waitqueue for tasks blocked on trace_poll */ |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 205 | static DECLARE_WAIT_QUEUE_HEAD(trace_wait); |
| 206 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 207 | /* trace_flags holds iter_ctrl options */ |
Steven Rostedt | 49833fc | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 208 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK; |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 209 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 210 | /** |
| 211 | * trace_wake_up - wake up tasks waiting for trace input |
| 212 | * |
| 213 | * Simply wakes up any task that is blocked on the trace_wait |
| 214 | * queue. These is used with trace_poll for tasks polling the trace. |
| 215 | */ |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 216 | void trace_wake_up(void) |
| 217 | { |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 218 | /* |
| 219 | * The runqueue_is_locked() can fail, but this is the best we |
| 220 | * have for now: |
| 221 | */ |
| 222 | if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 223 | wake_up(&trace_wait); |
| 224 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 225 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 226 | static int __init set_buf_size(char *str) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 227 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 228 | unsigned long buf_size; |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 229 | int ret; |
| 230 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 231 | if (!str) |
| 232 | return 0; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 233 | ret = strict_strtoul(str, 0, &buf_size); |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 234 | /* nr_entries can not be zero */ |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 235 | if (ret < 0 || buf_size == 0) |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 236 | return 0; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 237 | trace_buf_size = buf_size; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 238 | return 1; |
| 239 | } |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 240 | __setup("trace_buf_size=", set_buf_size); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 241 | |
Steven Rostedt | 57f50be | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 242 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
| 243 | { |
| 244 | return nsecs / 1000; |
| 245 | } |
| 246 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 247 | /* |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 248 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that |
| 249 | * control the output of kernel symbols. |
| 250 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 251 | #define TRACE_ITER_SYM_MASK \ |
| 252 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) |
| 253 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 254 | /* These must match the bit postions in trace_iterator_flags */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 255 | static const char *trace_options[] = { |
| 256 | "print-parent", |
| 257 | "sym-offset", |
| 258 | "sym-addr", |
| 259 | "verbose", |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 260 | "raw", |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 261 | "hex", |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 262 | "bin", |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 263 | "block", |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 264 | "stacktrace", |
Ingo Molnar | 4ac3ba4 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 265 | "sched-tree", |
Peter Zijlstra | f09ce57 | 2008-09-04 10:24:14 +0200 | [diff] [blame] | 266 | "ftrace_printk", |
Steven Rostedt | b2a866f | 2008-11-03 23:15:57 -0500 | [diff] [blame] | 267 | "ftrace_preempt", |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 268 | NULL |
| 269 | }; |
| 270 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 271 | /* |
| 272 | * ftrace_max_lock is used to protect the swapping of buffers |
| 273 | * when taking a max snapshot. The buffers themselves are |
| 274 | * protected by per_cpu spinlocks. But the action of the swap |
| 275 | * needs its own lock. |
| 276 | * |
| 277 | * This is defined as a raw_spinlock_t in order to help |
| 278 | * with performance when lockdep debugging is enabled. |
| 279 | */ |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 280 | static raw_spinlock_t ftrace_max_lock = |
| 281 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 282 | |
| 283 | /* |
| 284 | * Copy the new maximum trace into the separate maximum-trace |
| 285 | * structure. (this way the maximum trace is permanently saved, |
| 286 | * for later retrieval via /debugfs/tracing/latency_trace) |
| 287 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 288 | static void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 289 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 290 | { |
| 291 | struct trace_array_cpu *data = tr->data[cpu]; |
| 292 | |
| 293 | max_tr.cpu = cpu; |
| 294 | max_tr.time_start = data->preempt_timestamp; |
| 295 | |
| 296 | data = max_tr.data[cpu]; |
| 297 | data->saved_latency = tracing_max_latency; |
| 298 | |
| 299 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); |
| 300 | data->pid = tsk->pid; |
| 301 | data->uid = tsk->uid; |
| 302 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; |
| 303 | data->policy = tsk->policy; |
| 304 | data->rt_priority = tsk->rt_priority; |
| 305 | |
| 306 | /* record this tasks comm */ |
| 307 | tracing_record_cmdline(current); |
| 308 | } |
| 309 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 310 | /** |
| 311 | * trace_seq_printf - sequence printing of trace information |
| 312 | * @s: trace sequence descriptor |
| 313 | * @fmt: printf format string |
| 314 | * |
| 315 | * The tracer may use either sequence operations or its own |
| 316 | * copy to user routines. To simplify formating of a trace |
| 317 | * trace_seq_printf is used to store strings into a special |
| 318 | * buffer (@s). Then the output may be either used by |
| 319 | * the sequencer or pulled into another buffer. |
| 320 | */ |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 321 | int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 322 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
| 323 | { |
| 324 | int len = (PAGE_SIZE - 1) - s->len; |
| 325 | va_list ap; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 326 | int ret; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 327 | |
| 328 | if (!len) |
| 329 | return 0; |
| 330 | |
| 331 | va_start(ap, fmt); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 332 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 333 | va_end(ap); |
| 334 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 335 | /* If we can't write it all, don't bother writing anything */ |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 336 | if (ret >= len) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 337 | return 0; |
| 338 | |
| 339 | s->len += ret; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 340 | |
| 341 | return len; |
| 342 | } |
| 343 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 344 | /** |
| 345 | * trace_seq_puts - trace sequence printing of simple string |
| 346 | * @s: trace sequence descriptor |
| 347 | * @str: simple string to record |
| 348 | * |
| 349 | * The tracer may use either the sequence operations or its own |
| 350 | * copy to user routines. This function records a simple string |
| 351 | * into a special buffer (@s) for later retrieval by a sequencer |
| 352 | * or other mechanism. |
| 353 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 354 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 355 | trace_seq_puts(struct trace_seq *s, const char *str) |
| 356 | { |
| 357 | int len = strlen(str); |
| 358 | |
| 359 | if (len > ((PAGE_SIZE - 1) - s->len)) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 360 | return 0; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 361 | |
| 362 | memcpy(s->buffer + s->len, str, len); |
| 363 | s->len += len; |
| 364 | |
| 365 | return len; |
| 366 | } |
| 367 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 368 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 369 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
| 370 | { |
| 371 | if (s->len >= (PAGE_SIZE - 1)) |
| 372 | return 0; |
| 373 | |
| 374 | s->buffer[s->len++] = c; |
| 375 | |
| 376 | return 1; |
| 377 | } |
| 378 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 379 | static int |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 380 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
| 381 | { |
| 382 | if (len > ((PAGE_SIZE - 1) - s->len)) |
| 383 | return 0; |
| 384 | |
| 385 | memcpy(s->buffer + s->len, mem, len); |
| 386 | s->len += len; |
| 387 | |
| 388 | return len; |
| 389 | } |
| 390 | |
Harvey Harrison | ad0a3b6 | 2008-10-08 17:44:55 -0700 | [diff] [blame] | 391 | #define MAX_MEMHEX_BYTES 8 |
| 392 | #define HEX_CHARS (MAX_MEMHEX_BYTES*2 + 1) |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 393 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 394 | static int |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 395 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
| 396 | { |
| 397 | unsigned char hex[HEX_CHARS]; |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 398 | unsigned char *data = mem; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 399 | int i, j; |
| 400 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 401 | #ifdef __BIG_ENDIAN |
| 402 | for (i = 0, j = 0; i < len; i++) { |
| 403 | #else |
| 404 | for (i = len-1, j = 0; i >= 0; i--) { |
| 405 | #endif |
Harvey Harrison | 2fbc474 | 2008-10-08 16:51:49 -0700 | [diff] [blame] | 406 | hex[j++] = hex_asc_hi(data[i]); |
| 407 | hex[j++] = hex_asc_lo(data[i]); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 408 | } |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 409 | hex[j++] = ' '; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 410 | |
| 411 | return trace_seq_putmem(s, hex, j); |
| 412 | } |
| 413 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 414 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 415 | trace_seq_reset(struct trace_seq *s) |
| 416 | { |
| 417 | s->len = 0; |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 418 | s->readpos = 0; |
| 419 | } |
| 420 | |
| 421 | ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt) |
| 422 | { |
| 423 | int len; |
| 424 | int ret; |
| 425 | |
| 426 | if (s->len <= s->readpos) |
| 427 | return -EBUSY; |
| 428 | |
| 429 | len = s->len - s->readpos; |
| 430 | if (cnt > len) |
| 431 | cnt = len; |
| 432 | ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt); |
| 433 | if (ret) |
| 434 | return -EFAULT; |
| 435 | |
| 436 | s->readpos += len; |
| 437 | return cnt; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 438 | } |
| 439 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 440 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 441 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
| 442 | { |
| 443 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; |
| 444 | |
| 445 | s->buffer[len] = 0; |
| 446 | seq_puts(m, s->buffer); |
| 447 | |
| 448 | trace_seq_reset(s); |
| 449 | } |
| 450 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 451 | /** |
| 452 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr |
| 453 | * @tr: tracer |
| 454 | * @tsk: the task with the latency |
| 455 | * @cpu: The cpu that initiated the trace. |
| 456 | * |
| 457 | * Flip the buffers between the @tr and the max_tr and record information |
| 458 | * about which task was the cause of this latency. |
| 459 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 460 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 461 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 462 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 463 | struct ring_buffer *buf = tr->buffer; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 464 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 465 | WARN_ON_ONCE(!irqs_disabled()); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 466 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 467 | |
| 468 | tr->buffer = max_tr.buffer; |
| 469 | max_tr.buffer = buf; |
| 470 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 471 | ftrace_disable_cpu(); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 472 | ring_buffer_reset(tr->buffer); |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 473 | ftrace_enable_cpu(); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 474 | |
| 475 | __update_max_tr(tr, tsk, cpu); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 476 | __raw_spin_unlock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 477 | } |
| 478 | |
| 479 | /** |
| 480 | * update_max_tr_single - only copy one trace over, and reset the rest |
| 481 | * @tr - tracer |
| 482 | * @tsk - task with the latency |
| 483 | * @cpu - the cpu of the buffer to copy. |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 484 | * |
| 485 | * 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] | 486 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 487 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 488 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 489 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 490 | int ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 491 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 492 | WARN_ON_ONCE(!irqs_disabled()); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 493 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 494 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 495 | ftrace_disable_cpu(); |
| 496 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 497 | ring_buffer_reset(max_tr.buffer); |
| 498 | ret = ring_buffer_swap_cpu(max_tr.buffer, tr->buffer, cpu); |
| 499 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 500 | ftrace_enable_cpu(); |
| 501 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 502 | WARN_ON_ONCE(ret); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 503 | |
| 504 | __update_max_tr(tr, tsk, cpu); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 505 | __raw_spin_unlock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 506 | } |
| 507 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 508 | /** |
| 509 | * register_tracer - register a tracer with the ftrace system. |
| 510 | * @type - the plugin for the tracer |
| 511 | * |
| 512 | * Register a new plugin tracer. |
| 513 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 514 | int register_tracer(struct tracer *type) |
| 515 | { |
| 516 | struct tracer *t; |
| 517 | int len; |
| 518 | int ret = 0; |
| 519 | |
| 520 | if (!type->name) { |
| 521 | pr_info("Tracer must have a name\n"); |
| 522 | return -1; |
| 523 | } |
| 524 | |
| 525 | mutex_lock(&trace_types_lock); |
| 526 | for (t = trace_types; t; t = t->next) { |
| 527 | if (strcmp(type->name, t->name) == 0) { |
| 528 | /* already found */ |
| 529 | pr_info("Trace %s already registered\n", |
| 530 | type->name); |
| 531 | ret = -1; |
| 532 | goto out; |
| 533 | } |
| 534 | } |
| 535 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 536 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
| 537 | if (type->selftest) { |
| 538 | struct tracer *saved_tracer = current_trace; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 539 | struct trace_array *tr = &global_trace; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 540 | int i; |
| 541 | /* |
| 542 | * Run a selftest on this tracer. |
| 543 | * Here we reset the trace buffer, and set the current |
| 544 | * tracer to be this tracer. The tracer can then run some |
| 545 | * internal tracing to verify that everything is in order. |
| 546 | * If we fail, we do not register this tracer. |
| 547 | */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 548 | for_each_tracing_cpu(i) { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 549 | tracing_reset(tr, i); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 550 | } |
| 551 | current_trace = type; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 552 | /* the test is responsible for initializing and enabling */ |
| 553 | pr_info("Testing tracer %s: ", type->name); |
| 554 | ret = type->selftest(type, tr); |
| 555 | /* the test is responsible for resetting too */ |
| 556 | current_trace = saved_tracer; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 557 | if (ret) { |
| 558 | printk(KERN_CONT "FAILED!\n"); |
| 559 | goto out; |
| 560 | } |
Steven Rostedt | 1d4db00 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 561 | /* Only reset on passing, to avoid touching corrupted buffers */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 562 | for_each_tracing_cpu(i) { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 563 | tracing_reset(tr, i); |
Steven Rostedt | 1d4db00 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 564 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 565 | printk(KERN_CONT "PASSED\n"); |
| 566 | } |
| 567 | #endif |
| 568 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 569 | type->next = trace_types; |
| 570 | trace_types = type; |
| 571 | len = strlen(type->name); |
| 572 | if (len > max_tracer_type_len) |
| 573 | max_tracer_type_len = len; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 574 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 575 | out: |
| 576 | mutex_unlock(&trace_types_lock); |
| 577 | |
| 578 | return ret; |
| 579 | } |
| 580 | |
| 581 | void unregister_tracer(struct tracer *type) |
| 582 | { |
| 583 | struct tracer **t; |
| 584 | int len; |
| 585 | |
| 586 | mutex_lock(&trace_types_lock); |
| 587 | for (t = &trace_types; *t; t = &(*t)->next) { |
| 588 | if (*t == type) |
| 589 | goto found; |
| 590 | } |
| 591 | pr_info("Trace %s not registered\n", type->name); |
| 592 | goto out; |
| 593 | |
| 594 | found: |
| 595 | *t = (*t)->next; |
| 596 | if (strlen(type->name) != max_tracer_type_len) |
| 597 | goto out; |
| 598 | |
| 599 | max_tracer_type_len = 0; |
| 600 | for (t = &trace_types; *t; t = &(*t)->next) { |
| 601 | len = strlen((*t)->name); |
| 602 | if (len > max_tracer_type_len) |
| 603 | max_tracer_type_len = len; |
| 604 | } |
| 605 | out: |
| 606 | mutex_unlock(&trace_types_lock); |
| 607 | } |
| 608 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 609 | void tracing_reset(struct trace_array *tr, int cpu) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 610 | { |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 611 | ftrace_disable_cpu(); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 612 | ring_buffer_reset_cpu(tr->buffer, cpu); |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 613 | ftrace_enable_cpu(); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 614 | } |
| 615 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 616 | #define SAVED_CMDLINES 128 |
| 617 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; |
| 618 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; |
| 619 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; |
| 620 | static int cmdline_idx; |
| 621 | static DEFINE_SPINLOCK(trace_cmdline_lock); |
Steven Rostedt | 25b0b44 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 622 | |
Steven Rostedt | 25b0b44 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 623 | /* temporary disable recording */ |
| 624 | atomic_t trace_record_cmdline_disabled __read_mostly; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 625 | |
| 626 | static void trace_init_cmdlines(void) |
| 627 | { |
| 628 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); |
| 629 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); |
| 630 | cmdline_idx = 0; |
| 631 | } |
| 632 | |
Steven Rostedt | 0f04870 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 633 | static int trace_stop_count; |
| 634 | static DEFINE_SPINLOCK(tracing_start_lock); |
| 635 | |
| 636 | /** |
| 637 | * tracing_start - quick start of the tracer |
| 638 | * |
| 639 | * If tracing is enabled but was stopped by tracing_stop, |
| 640 | * this will start the tracer back up. |
| 641 | */ |
| 642 | void tracing_start(void) |
| 643 | { |
| 644 | struct ring_buffer *buffer; |
| 645 | unsigned long flags; |
| 646 | |
| 647 | if (tracing_disabled) |
| 648 | return; |
| 649 | |
| 650 | spin_lock_irqsave(&tracing_start_lock, flags); |
| 651 | if (--trace_stop_count) |
| 652 | goto out; |
| 653 | |
| 654 | if (trace_stop_count < 0) { |
| 655 | /* Someone screwed up their debugging */ |
| 656 | WARN_ON_ONCE(1); |
| 657 | trace_stop_count = 0; |
| 658 | goto out; |
| 659 | } |
| 660 | |
| 661 | |
| 662 | buffer = global_trace.buffer; |
| 663 | if (buffer) |
| 664 | ring_buffer_record_enable(buffer); |
| 665 | |
| 666 | buffer = max_tr.buffer; |
| 667 | if (buffer) |
| 668 | ring_buffer_record_enable(buffer); |
| 669 | |
| 670 | ftrace_start(); |
| 671 | out: |
| 672 | spin_unlock_irqrestore(&tracing_start_lock, flags); |
| 673 | } |
| 674 | |
| 675 | /** |
| 676 | * tracing_stop - quick stop of the tracer |
| 677 | * |
| 678 | * Light weight way to stop tracing. Use in conjunction with |
| 679 | * tracing_start. |
| 680 | */ |
| 681 | void tracing_stop(void) |
| 682 | { |
| 683 | struct ring_buffer *buffer; |
| 684 | unsigned long flags; |
| 685 | |
| 686 | ftrace_stop(); |
| 687 | spin_lock_irqsave(&tracing_start_lock, flags); |
| 688 | if (trace_stop_count++) |
| 689 | goto out; |
| 690 | |
| 691 | buffer = global_trace.buffer; |
| 692 | if (buffer) |
| 693 | ring_buffer_record_disable(buffer); |
| 694 | |
| 695 | buffer = max_tr.buffer; |
| 696 | if (buffer) |
| 697 | ring_buffer_record_disable(buffer); |
| 698 | |
| 699 | out: |
| 700 | spin_unlock_irqrestore(&tracing_start_lock, flags); |
| 701 | } |
| 702 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 703 | void trace_stop_cmdline_recording(void); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 704 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 705 | static void trace_save_cmdline(struct task_struct *tsk) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 706 | { |
| 707 | unsigned map; |
| 708 | unsigned idx; |
| 709 | |
| 710 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) |
| 711 | return; |
| 712 | |
| 713 | /* |
| 714 | * It's not the end of the world if we don't get |
| 715 | * the lock, but we also don't want to spin |
| 716 | * nor do we want to disable interrupts, |
| 717 | * so if we miss here, then better luck next time. |
| 718 | */ |
| 719 | if (!spin_trylock(&trace_cmdline_lock)) |
| 720 | return; |
| 721 | |
| 722 | idx = map_pid_to_cmdline[tsk->pid]; |
| 723 | if (idx >= SAVED_CMDLINES) { |
| 724 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; |
| 725 | |
| 726 | map = map_cmdline_to_pid[idx]; |
| 727 | if (map <= PID_MAX_DEFAULT) |
| 728 | map_pid_to_cmdline[map] = (unsigned)-1; |
| 729 | |
| 730 | map_pid_to_cmdline[tsk->pid] = idx; |
| 731 | |
| 732 | cmdline_idx = idx; |
| 733 | } |
| 734 | |
| 735 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); |
| 736 | |
| 737 | spin_unlock(&trace_cmdline_lock); |
| 738 | } |
| 739 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 740 | static char *trace_find_cmdline(int pid) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 741 | { |
| 742 | char *cmdline = "<...>"; |
| 743 | unsigned map; |
| 744 | |
| 745 | if (!pid) |
| 746 | return "<idle>"; |
| 747 | |
| 748 | if (pid > PID_MAX_DEFAULT) |
| 749 | goto out; |
| 750 | |
| 751 | map = map_pid_to_cmdline[pid]; |
| 752 | if (map >= SAVED_CMDLINES) |
| 753 | goto out; |
| 754 | |
| 755 | cmdline = saved_cmdlines[map]; |
| 756 | |
| 757 | out: |
| 758 | return cmdline; |
| 759 | } |
| 760 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 761 | void tracing_record_cmdline(struct task_struct *tsk) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 762 | { |
| 763 | if (atomic_read(&trace_record_cmdline_disabled)) |
| 764 | return; |
| 765 | |
| 766 | trace_save_cmdline(tsk); |
| 767 | } |
| 768 | |
Pekka Paalanen | 45dcd8b | 2008-09-16 21:56:41 +0300 | [diff] [blame] | 769 | void |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 770 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags, |
| 771 | int pc) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 772 | { |
| 773 | struct task_struct *tsk = current; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 774 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 775 | entry->preempt_count = pc & 0xff; |
| 776 | entry->pid = (tsk) ? tsk->pid : 0; |
| 777 | entry->flags = |
Steven Rostedt | 9244489 | 2008-10-24 09:42:59 -0400 | [diff] [blame] | 778 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 779 | (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
Steven Rostedt | 9244489 | 2008-10-24 09:42:59 -0400 | [diff] [blame] | 780 | #else |
| 781 | TRACE_FLAG_IRQS_NOSUPPORT | |
| 782 | #endif |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 783 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
| 784 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | |
| 785 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); |
| 786 | } |
| 787 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 788 | void |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 789 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 790 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
| 791 | int pc) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 792 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 793 | struct ring_buffer_event *event; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 794 | struct ftrace_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 795 | unsigned long irq_flags; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 796 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 797 | /* If we are reading the ring buffer, don't trace */ |
| 798 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) |
| 799 | return; |
| 800 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 801 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
| 802 | &irq_flags); |
| 803 | if (!event) |
| 804 | return; |
| 805 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 806 | tracing_generic_entry_update(&entry->ent, flags, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 807 | entry->ent.type = TRACE_FN; |
| 808 | entry->ip = ip; |
| 809 | entry->parent_ip = parent_ip; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 810 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 811 | } |
| 812 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 813 | void |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 814 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 815 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
| 816 | int pc) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 817 | { |
| 818 | if (likely(!atomic_read(&data->disabled))) |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 819 | trace_function(tr, data, ip, parent_ip, flags, pc); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 820 | } |
| 821 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 822 | static void ftrace_trace_stack(struct trace_array *tr, |
| 823 | struct trace_array_cpu *data, |
| 824 | unsigned long flags, |
| 825 | int skip, int pc) |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 826 | { |
Al Viro | c2c8052 | 2008-10-31 19:50:41 +0000 | [diff] [blame] | 827 | #ifdef CONFIG_STACKTRACE |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 828 | struct ring_buffer_event *event; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 829 | struct stack_entry *entry; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 830 | struct stack_trace trace; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 831 | unsigned long irq_flags; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 832 | |
| 833 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) |
| 834 | return; |
| 835 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 836 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
| 837 | &irq_flags); |
| 838 | if (!event) |
| 839 | return; |
| 840 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 841 | tracing_generic_entry_update(&entry->ent, flags, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 842 | entry->ent.type = TRACE_STACK; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 843 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 844 | memset(&entry->caller, 0, sizeof(entry->caller)); |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 845 | |
| 846 | trace.nr_entries = 0; |
| 847 | trace.max_entries = FTRACE_STACK_ENTRIES; |
| 848 | trace.skip = skip; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 849 | trace.entries = entry->caller; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 850 | |
| 851 | save_stack_trace(&trace); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 852 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Al Viro | c2c8052 | 2008-10-31 19:50:41 +0000 | [diff] [blame] | 853 | #endif |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 854 | } |
| 855 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 856 | void __trace_stack(struct trace_array *tr, |
| 857 | struct trace_array_cpu *data, |
| 858 | unsigned long flags, |
| 859 | int skip) |
| 860 | { |
| 861 | ftrace_trace_stack(tr, data, flags, skip, preempt_count()); |
| 862 | } |
| 863 | |
| 864 | static void |
| 865 | ftrace_trace_special(void *__tr, void *__data, |
| 866 | unsigned long arg1, unsigned long arg2, unsigned long arg3, |
| 867 | int pc) |
Ingo Molnar | a4feb834 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 868 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 869 | struct ring_buffer_event *event; |
Ingo Molnar | a4feb834 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 870 | struct trace_array_cpu *data = __data; |
| 871 | struct trace_array *tr = __tr; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 872 | struct special_entry *entry; |
Ingo Molnar | a4feb834 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 873 | unsigned long irq_flags; |
| 874 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 875 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
| 876 | &irq_flags); |
| 877 | if (!event) |
| 878 | return; |
| 879 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 880 | tracing_generic_entry_update(&entry->ent, 0, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 881 | entry->ent.type = TRACE_SPECIAL; |
| 882 | entry->arg1 = arg1; |
| 883 | entry->arg2 = arg2; |
| 884 | entry->arg3 = arg3; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 885 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 886 | ftrace_trace_stack(tr, data, irq_flags, 4, pc); |
Ingo Molnar | a4feb834 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 887 | |
| 888 | trace_wake_up(); |
| 889 | } |
| 890 | |
| 891 | void |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 892 | __trace_special(void *__tr, void *__data, |
| 893 | unsigned long arg1, unsigned long arg2, unsigned long arg3) |
| 894 | { |
| 895 | ftrace_trace_special(__tr, __data, arg1, arg2, arg3, preempt_count()); |
| 896 | } |
| 897 | |
| 898 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 899 | tracing_sched_switch_trace(struct trace_array *tr, |
| 900 | struct trace_array_cpu *data, |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 901 | struct task_struct *prev, |
| 902 | struct task_struct *next, |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 903 | unsigned long flags, int pc) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 904 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 905 | struct ring_buffer_event *event; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 906 | struct ctx_switch_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 907 | unsigned long irq_flags; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 908 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 909 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
| 910 | &irq_flags); |
| 911 | if (!event) |
| 912 | return; |
| 913 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 914 | tracing_generic_entry_update(&entry->ent, flags, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 915 | entry->ent.type = TRACE_CTX; |
| 916 | entry->prev_pid = prev->pid; |
| 917 | entry->prev_prio = prev->prio; |
| 918 | entry->prev_state = prev->state; |
| 919 | entry->next_pid = next->pid; |
| 920 | entry->next_prio = next->prio; |
| 921 | entry->next_state = next->state; |
| 922 | entry->next_cpu = task_cpu(next); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 923 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 924 | ftrace_trace_stack(tr, data, flags, 5, pc); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 925 | } |
| 926 | |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 927 | void |
| 928 | tracing_sched_wakeup_trace(struct trace_array *tr, |
| 929 | struct trace_array_cpu *data, |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 930 | struct task_struct *wakee, |
| 931 | struct task_struct *curr, |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 932 | unsigned long flags, int pc) |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 933 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 934 | struct ring_buffer_event *event; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 935 | struct ctx_switch_entry *entry; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 936 | unsigned long irq_flags; |
| 937 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 938 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
| 939 | &irq_flags); |
| 940 | if (!event) |
| 941 | return; |
| 942 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 943 | tracing_generic_entry_update(&entry->ent, flags, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 944 | entry->ent.type = TRACE_WAKE; |
| 945 | entry->prev_pid = curr->pid; |
| 946 | entry->prev_prio = curr->prio; |
| 947 | entry->prev_state = curr->state; |
| 948 | entry->next_pid = wakee->pid; |
| 949 | entry->next_prio = wakee->prio; |
| 950 | entry->next_state = wakee->state; |
| 951 | entry->next_cpu = task_cpu(wakee); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 952 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 953 | ftrace_trace_stack(tr, data, flags, 6, pc); |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 954 | |
| 955 | trace_wake_up(); |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 956 | } |
| 957 | |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 958 | void |
| 959 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) |
| 960 | { |
| 961 | struct trace_array *tr = &global_trace; |
| 962 | struct trace_array_cpu *data; |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 963 | int cpu; |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 964 | int pc; |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 965 | |
Steven Rostedt | c76f069 | 2008-11-07 22:36:02 -0500 | [diff] [blame^] | 966 | if (tracing_disabled) |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 967 | return; |
| 968 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 969 | pc = preempt_count(); |
| 970 | preempt_disable_notrace(); |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 971 | cpu = raw_smp_processor_id(); |
| 972 | data = tr->data[cpu]; |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 973 | |
Steven Rostedt | 3ea2e6d | 2008-10-04 02:01:00 -0400 | [diff] [blame] | 974 | if (likely(!atomic_read(&data->disabled))) |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 975 | ftrace_trace_special(tr, data, arg1, arg2, arg3, pc); |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 976 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 977 | preempt_enable_notrace(); |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 978 | } |
| 979 | |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 980 | #ifdef CONFIG_FUNCTION_TRACER |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 981 | static void |
Steven Rostedt | b2a866f | 2008-11-03 23:15:57 -0500 | [diff] [blame] | 982 | function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 983 | { |
| 984 | struct trace_array *tr = &global_trace; |
| 985 | struct trace_array_cpu *data; |
| 986 | unsigned long flags; |
| 987 | long disabled; |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 988 | int cpu, resched; |
| 989 | int pc; |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 990 | |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 991 | if (unlikely(!ftrace_function_enabled)) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 992 | return; |
| 993 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 994 | pc = preempt_count(); |
Steven Rostedt | 182e9f5 | 2008-11-03 23:15:56 -0500 | [diff] [blame] | 995 | resched = ftrace_preempt_disable(); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 996 | local_save_flags(flags); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 997 | cpu = raw_smp_processor_id(); |
| 998 | data = tr->data[cpu]; |
| 999 | disabled = atomic_inc_return(&data->disabled); |
| 1000 | |
| 1001 | if (likely(disabled == 1)) |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 1002 | trace_function(tr, data, ip, parent_ip, flags, pc); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1003 | |
| 1004 | atomic_dec(&data->disabled); |
Steven Rostedt | 182e9f5 | 2008-11-03 23:15:56 -0500 | [diff] [blame] | 1005 | ftrace_preempt_enable(resched); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1006 | } |
| 1007 | |
Steven Rostedt | b2a866f | 2008-11-03 23:15:57 -0500 | [diff] [blame] | 1008 | static void |
| 1009 | function_trace_call(unsigned long ip, unsigned long parent_ip) |
| 1010 | { |
| 1011 | struct trace_array *tr = &global_trace; |
| 1012 | struct trace_array_cpu *data; |
| 1013 | unsigned long flags; |
| 1014 | long disabled; |
| 1015 | int cpu; |
| 1016 | int pc; |
| 1017 | |
| 1018 | if (unlikely(!ftrace_function_enabled)) |
| 1019 | return; |
| 1020 | |
| 1021 | /* |
| 1022 | * Need to use raw, since this must be called before the |
| 1023 | * recursive protection is performed. |
| 1024 | */ |
| 1025 | raw_local_irq_save(flags); |
| 1026 | cpu = raw_smp_processor_id(); |
| 1027 | data = tr->data[cpu]; |
| 1028 | disabled = atomic_inc_return(&data->disabled); |
| 1029 | |
| 1030 | if (likely(disabled == 1)) { |
| 1031 | pc = preempt_count(); |
| 1032 | trace_function(tr, data, ip, parent_ip, flags, pc); |
| 1033 | } |
| 1034 | |
| 1035 | atomic_dec(&data->disabled); |
| 1036 | raw_local_irq_restore(flags); |
| 1037 | } |
| 1038 | |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1039 | static struct ftrace_ops trace_ops __read_mostly = |
| 1040 | { |
| 1041 | .func = function_trace_call, |
| 1042 | }; |
| 1043 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1044 | void tracing_start_function_trace(void) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1045 | { |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 1046 | ftrace_function_enabled = 0; |
Steven Rostedt | b2a866f | 2008-11-03 23:15:57 -0500 | [diff] [blame] | 1047 | |
| 1048 | if (trace_flags & TRACE_ITER_PREEMPTONLY) |
| 1049 | trace_ops.func = function_trace_call_preempt_only; |
| 1050 | else |
| 1051 | trace_ops.func = function_trace_call; |
| 1052 | |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1053 | register_ftrace_function(&trace_ops); |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 1054 | ftrace_function_enabled = 1; |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1055 | } |
| 1056 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1057 | void tracing_stop_function_trace(void) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1058 | { |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 1059 | ftrace_function_enabled = 0; |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1060 | unregister_ftrace_function(&trace_ops); |
| 1061 | } |
| 1062 | #endif |
| 1063 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1064 | enum trace_file_type { |
| 1065 | TRACE_FILE_LAT_FMT = 1, |
| 1066 | }; |
| 1067 | |
Steven Rostedt | 5a90f57 | 2008-09-03 17:42:51 -0400 | [diff] [blame] | 1068 | static void trace_iterator_increment(struct trace_iterator *iter, int cpu) |
| 1069 | { |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1070 | /* Don't allow ftrace to trace into the ring buffers */ |
| 1071 | ftrace_disable_cpu(); |
| 1072 | |
Steven Rostedt | 5a90f57 | 2008-09-03 17:42:51 -0400 | [diff] [blame] | 1073 | iter->idx++; |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1074 | if (iter->buffer_iter[iter->cpu]) |
| 1075 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); |
| 1076 | |
| 1077 | ftrace_enable_cpu(); |
Steven Rostedt | 5a90f57 | 2008-09-03 17:42:51 -0400 | [diff] [blame] | 1078 | } |
| 1079 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1080 | static struct trace_entry * |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1081 | peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1082 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1083 | struct ring_buffer_event *event; |
| 1084 | struct ring_buffer_iter *buf_iter = iter->buffer_iter[cpu]; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1085 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1086 | /* Don't allow ftrace to trace into the ring buffers */ |
| 1087 | ftrace_disable_cpu(); |
| 1088 | |
| 1089 | if (buf_iter) |
| 1090 | event = ring_buffer_iter_peek(buf_iter, ts); |
| 1091 | else |
| 1092 | event = ring_buffer_peek(iter->tr->buffer, cpu, ts); |
| 1093 | |
| 1094 | ftrace_enable_cpu(); |
| 1095 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1096 | return event ? ring_buffer_event_data(event) : NULL; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1097 | } |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1098 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1099 | static struct trace_entry * |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1100 | __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] | 1101 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1102 | struct ring_buffer *buffer = iter->tr->buffer; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1103 | struct trace_entry *ent, *next = NULL; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1104 | u64 next_ts = 0, ts; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1105 | int next_cpu = -1; |
| 1106 | int cpu; |
| 1107 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1108 | for_each_tracing_cpu(cpu) { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1109 | |
| 1110 | if (ring_buffer_empty_cpu(buffer, cpu)) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1111 | continue; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1112 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1113 | ent = peek_next_entry(iter, cpu, &ts); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1114 | |
Ingo Molnar | cdd31cd | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1115 | /* |
| 1116 | * Pick the entry with the smallest timestamp: |
| 1117 | */ |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1118 | if (ent && (!next || ts < next_ts)) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1119 | next = ent; |
| 1120 | next_cpu = cpu; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1121 | next_ts = ts; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1122 | } |
| 1123 | } |
| 1124 | |
| 1125 | if (ent_cpu) |
| 1126 | *ent_cpu = next_cpu; |
| 1127 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1128 | if (ent_ts) |
| 1129 | *ent_ts = next_ts; |
| 1130 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1131 | return next; |
| 1132 | } |
| 1133 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1134 | /* Find the next real entry, without updating the iterator itself */ |
| 1135 | static struct trace_entry * |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1136 | 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] | 1137 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1138 | return __find_next_entry(iter, ent_cpu, ent_ts); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1139 | } |
Ingo Molnar | 8c523a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1140 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1141 | /* Find the next real entry, and increment the iterator to the next entry */ |
| 1142 | static void *find_next_entry_inc(struct trace_iterator *iter) |
| 1143 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1144 | iter->ent = __find_next_entry(iter, &iter->cpu, &iter->ts); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1145 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1146 | if (iter->ent) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1147 | trace_iterator_increment(iter, iter->cpu); |
| 1148 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1149 | return iter->ent ? iter : NULL; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1150 | } |
| 1151 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1152 | static void trace_consume(struct trace_iterator *iter) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1153 | { |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1154 | /* Don't allow ftrace to trace into the ring buffers */ |
| 1155 | ftrace_disable_cpu(); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1156 | ring_buffer_consume(iter->tr->buffer, iter->cpu, &iter->ts); |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1157 | ftrace_enable_cpu(); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1158 | } |
| 1159 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1160 | 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] | 1161 | { |
| 1162 | struct trace_iterator *iter = m->private; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1163 | int i = (int)*pos; |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1164 | void *ent; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1165 | |
| 1166 | (*pos)++; |
| 1167 | |
| 1168 | /* can't go backwards */ |
| 1169 | if (iter->idx > i) |
| 1170 | return NULL; |
| 1171 | |
| 1172 | if (iter->idx < 0) |
| 1173 | ent = find_next_entry_inc(iter); |
| 1174 | else |
| 1175 | ent = iter; |
| 1176 | |
| 1177 | while (ent && iter->idx < i) |
| 1178 | ent = find_next_entry_inc(iter); |
| 1179 | |
| 1180 | iter->pos = *pos; |
| 1181 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1182 | return ent; |
| 1183 | } |
| 1184 | |
| 1185 | static void *s_start(struct seq_file *m, loff_t *pos) |
| 1186 | { |
| 1187 | struct trace_iterator *iter = m->private; |
| 1188 | void *p = NULL; |
| 1189 | loff_t l = 0; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1190 | int cpu; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1191 | |
| 1192 | mutex_lock(&trace_types_lock); |
| 1193 | |
Steven Rostedt | d15f57f | 2008-05-12 21:20:56 +0200 | [diff] [blame] | 1194 | if (!current_trace || current_trace != iter->trace) { |
| 1195 | mutex_unlock(&trace_types_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1196 | return NULL; |
Steven Rostedt | d15f57f | 2008-05-12 21:20:56 +0200 | [diff] [blame] | 1197 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1198 | |
| 1199 | atomic_inc(&trace_record_cmdline_disabled); |
| 1200 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1201 | if (*pos != iter->pos) { |
| 1202 | iter->ent = NULL; |
| 1203 | iter->cpu = 0; |
| 1204 | iter->idx = -1; |
| 1205 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1206 | ftrace_disable_cpu(); |
| 1207 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1208 | for_each_tracing_cpu(cpu) { |
| 1209 | ring_buffer_iter_reset(iter->buffer_iter[cpu]); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1210 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1211 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1212 | ftrace_enable_cpu(); |
| 1213 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1214 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
| 1215 | ; |
| 1216 | |
| 1217 | } else { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1218 | l = *pos - 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1219 | p = s_next(m, p, &l); |
| 1220 | } |
| 1221 | |
| 1222 | return p; |
| 1223 | } |
| 1224 | |
| 1225 | static void s_stop(struct seq_file *m, void *p) |
| 1226 | { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1227 | atomic_dec(&trace_record_cmdline_disabled); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1228 | mutex_unlock(&trace_types_lock); |
| 1229 | } |
| 1230 | |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 1231 | #ifdef CONFIG_KRETPROBES |
Steven Rostedt | b3aa557 | 2008-10-31 15:44:07 -0400 | [diff] [blame] | 1232 | static inline const char *kretprobed(const char *name) |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 1233 | { |
Steven Rostedt | b3aa557 | 2008-10-31 15:44:07 -0400 | [diff] [blame] | 1234 | static const char tramp_name[] = "kretprobe_trampoline"; |
| 1235 | int size = sizeof(tramp_name); |
| 1236 | |
| 1237 | if (strncmp(tramp_name, name, size) == 0) |
| 1238 | return "[unknown/kretprobe'd]"; |
| 1239 | return name; |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 1240 | } |
| 1241 | #else |
Steven Rostedt | b3aa557 | 2008-10-31 15:44:07 -0400 | [diff] [blame] | 1242 | static inline const char *kretprobed(const char *name) |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 1243 | { |
Steven Rostedt | b3aa557 | 2008-10-31 15:44:07 -0400 | [diff] [blame] | 1244 | return name; |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 1245 | } |
| 1246 | #endif /* CONFIG_KRETPROBES */ |
| 1247 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1248 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1249 | 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] | 1250 | { |
| 1251 | #ifdef CONFIG_KALLSYMS |
| 1252 | char str[KSYM_SYMBOL_LEN]; |
Steven Rostedt | b3aa557 | 2008-10-31 15:44:07 -0400 | [diff] [blame] | 1253 | const char *name; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1254 | |
| 1255 | kallsyms_lookup(address, NULL, NULL, NULL, str); |
| 1256 | |
Steven Rostedt | b3aa557 | 2008-10-31 15:44:07 -0400 | [diff] [blame] | 1257 | name = kretprobed(str); |
| 1258 | |
| 1259 | return trace_seq_printf(s, fmt, name); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1260 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1261 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1262 | } |
| 1263 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1264 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1265 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
| 1266 | unsigned long address) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1267 | { |
| 1268 | #ifdef CONFIG_KALLSYMS |
| 1269 | char str[KSYM_SYMBOL_LEN]; |
Steven Rostedt | b3aa557 | 2008-10-31 15:44:07 -0400 | [diff] [blame] | 1270 | const char *name; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1271 | |
| 1272 | sprint_symbol(str, address); |
Steven Rostedt | b3aa557 | 2008-10-31 15:44:07 -0400 | [diff] [blame] | 1273 | name = kretprobed(str); |
| 1274 | |
| 1275 | return trace_seq_printf(s, fmt, name); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1276 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1277 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1278 | } |
| 1279 | |
| 1280 | #ifndef CONFIG_64BIT |
| 1281 | # define IP_FMT "%08lx" |
| 1282 | #else |
| 1283 | # define IP_FMT "%016lx" |
| 1284 | #endif |
| 1285 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1286 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1287 | 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] | 1288 | { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1289 | int ret; |
| 1290 | |
| 1291 | if (!ip) |
| 1292 | return trace_seq_printf(s, "0"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1293 | |
| 1294 | if (sym_flags & TRACE_ITER_SYM_OFFSET) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1295 | ret = seq_print_sym_offset(s, "%s", ip); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1296 | else |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1297 | ret = seq_print_sym_short(s, "%s", ip); |
| 1298 | |
| 1299 | if (!ret) |
| 1300 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1301 | |
| 1302 | if (sym_flags & TRACE_ITER_SYM_ADDR) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1303 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
| 1304 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1305 | } |
| 1306 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1307 | static void print_lat_help_header(struct seq_file *m) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1308 | { |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1309 | seq_puts(m, "# _------=> CPU# \n"); |
| 1310 | seq_puts(m, "# / _-----=> irqs-off \n"); |
| 1311 | seq_puts(m, "# | / _----=> need-resched \n"); |
| 1312 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); |
| 1313 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); |
| 1314 | seq_puts(m, "# |||| / \n"); |
| 1315 | seq_puts(m, "# ||||| delay \n"); |
| 1316 | seq_puts(m, "# cmd pid ||||| time | caller \n"); |
| 1317 | seq_puts(m, "# \\ / ||||| \\ | / \n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1318 | } |
| 1319 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1320 | static void print_func_help_header(struct seq_file *m) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1321 | { |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1322 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
| 1323 | seq_puts(m, "# | | | | |\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1324 | } |
| 1325 | |
| 1326 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1327 | static void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1328 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
| 1329 | { |
| 1330 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
| 1331 | struct trace_array *tr = iter->tr; |
| 1332 | struct trace_array_cpu *data = tr->data[tr->cpu]; |
| 1333 | struct tracer *type = current_trace; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1334 | unsigned long total; |
| 1335 | unsigned long entries; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1336 | const char *name = "preemption"; |
| 1337 | |
| 1338 | if (type) |
| 1339 | name = type->name; |
| 1340 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1341 | entries = ring_buffer_entries(iter->tr->buffer); |
| 1342 | total = entries + |
| 1343 | ring_buffer_overruns(iter->tr->buffer); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1344 | |
| 1345 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", |
| 1346 | name, UTS_RELEASE); |
| 1347 | seq_puts(m, "-----------------------------------" |
| 1348 | "---------------------------------\n"); |
| 1349 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" |
| 1350 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", |
Steven Rostedt | 57f50be | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1351 | nsecs_to_usecs(data->saved_latency), |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1352 | entries, |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1353 | total, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1354 | tr->cpu, |
| 1355 | #if defined(CONFIG_PREEMPT_NONE) |
| 1356 | "server", |
| 1357 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) |
| 1358 | "desktop", |
Steven Rostedt | b5c21b4 | 2008-07-10 20:58:12 -0400 | [diff] [blame] | 1359 | #elif defined(CONFIG_PREEMPT) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1360 | "preempt", |
| 1361 | #else |
| 1362 | "unknown", |
| 1363 | #endif |
| 1364 | /* These are reserved for later use */ |
| 1365 | 0, 0, 0, 0); |
| 1366 | #ifdef CONFIG_SMP |
| 1367 | seq_printf(m, " #P:%d)\n", num_online_cpus()); |
| 1368 | #else |
| 1369 | seq_puts(m, ")\n"); |
| 1370 | #endif |
| 1371 | seq_puts(m, " -----------------\n"); |
| 1372 | seq_printf(m, " | task: %.16s-%d " |
| 1373 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", |
| 1374 | data->comm, data->pid, data->uid, data->nice, |
| 1375 | data->policy, data->rt_priority); |
| 1376 | seq_puts(m, " -----------------\n"); |
| 1377 | |
| 1378 | if (data->critical_start) { |
| 1379 | seq_puts(m, " => started at: "); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1380 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
| 1381 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1382 | seq_puts(m, "\n => ended at: "); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1383 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
| 1384 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1385 | seq_puts(m, "\n"); |
| 1386 | } |
| 1387 | |
| 1388 | seq_puts(m, "\n"); |
| 1389 | } |
| 1390 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1391 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1392 | 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] | 1393 | { |
| 1394 | int hardirq, softirq; |
| 1395 | char *comm; |
| 1396 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1397 | comm = trace_find_cmdline(entry->pid); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1398 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1399 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1400 | trace_seq_printf(s, "%3d", cpu); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1401 | trace_seq_printf(s, "%c%c", |
Steven Rostedt | 9244489 | 2008-10-24 09:42:59 -0400 | [diff] [blame] | 1402 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : |
| 1403 | (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' : '.', |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1404 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1405 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1406 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; |
| 1407 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1408 | if (hardirq && softirq) { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1409 | trace_seq_putc(s, 'H'); |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1410 | } else { |
| 1411 | if (hardirq) { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1412 | trace_seq_putc(s, 'h'); |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1413 | } else { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1414 | if (softirq) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1415 | trace_seq_putc(s, 's'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1416 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1417 | trace_seq_putc(s, '.'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1418 | } |
| 1419 | } |
| 1420 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1421 | if (entry->preempt_count) |
| 1422 | trace_seq_printf(s, "%x", entry->preempt_count); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1423 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1424 | trace_seq_puts(s, "."); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1425 | } |
| 1426 | |
| 1427 | unsigned long preempt_mark_thresh = 100; |
| 1428 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1429 | static void |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1430 | lat_print_timestamp(struct trace_seq *s, u64 abs_usecs, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1431 | unsigned long rel_usecs) |
| 1432 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1433 | trace_seq_printf(s, " %4lldus", abs_usecs); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1434 | if (rel_usecs > preempt_mark_thresh) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1435 | trace_seq_puts(s, "!: "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1436 | else if (rel_usecs > 1) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1437 | trace_seq_puts(s, "+: "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1438 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1439 | trace_seq_puts(s, " : "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1440 | } |
| 1441 | |
| 1442 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; |
| 1443 | |
Pekka Paalanen | fc5e27a | 2008-09-16 22:02:27 +0300 | [diff] [blame] | 1444 | /* |
| 1445 | * The message is supposed to contain an ending newline. |
| 1446 | * If the printing stops prematurely, try to add a newline of our own. |
| 1447 | */ |
| 1448 | 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] | 1449 | { |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1450 | struct trace_entry *ent; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1451 | struct trace_field_cont *cont; |
Pekka Paalanen | fc5e27a | 2008-09-16 22:02:27 +0300 | [diff] [blame] | 1452 | bool ok = true; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1453 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1454 | ent = peek_next_entry(iter, iter->cpu, NULL); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1455 | if (!ent || ent->type != TRACE_CONT) { |
| 1456 | trace_seq_putc(s, '\n'); |
| 1457 | return; |
| 1458 | } |
| 1459 | |
| 1460 | do { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1461 | cont = (struct trace_field_cont *)ent; |
Pekka Paalanen | fc5e27a | 2008-09-16 22:02:27 +0300 | [diff] [blame] | 1462 | if (ok) |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1463 | ok = (trace_seq_printf(s, "%s", cont->buf) > 0); |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1464 | |
| 1465 | ftrace_disable_cpu(); |
| 1466 | |
| 1467 | if (iter->buffer_iter[iter->cpu]) |
| 1468 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); |
| 1469 | else |
| 1470 | ring_buffer_consume(iter->tr->buffer, iter->cpu, NULL); |
| 1471 | |
| 1472 | ftrace_enable_cpu(); |
| 1473 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1474 | ent = peek_next_entry(iter, iter->cpu, NULL); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1475 | } while (ent && ent->type == TRACE_CONT); |
Pekka Paalanen | fc5e27a | 2008-09-16 22:02:27 +0300 | [diff] [blame] | 1476 | |
| 1477 | if (!ok) |
| 1478 | trace_seq_putc(s, '\n'); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1479 | } |
| 1480 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1481 | static enum print_line_t |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1482 | 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] | 1483 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1484 | struct trace_seq *s = &iter->seq; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1485 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1486 | struct trace_entry *next_entry; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1487 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); |
| 1488 | struct trace_entry *entry = iter->ent; |
| 1489 | unsigned long abs_usecs; |
| 1490 | unsigned long rel_usecs; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1491 | u64 next_ts; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1492 | char *comm; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1493 | int S, T; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1494 | int i; |
Ankita Garg | d17d969 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 1495 | unsigned state; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1496 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1497 | if (entry->type == TRACE_CONT) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1498 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1499 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1500 | next_entry = find_next_entry(iter, NULL, &next_ts); |
| 1501 | if (!next_entry) |
| 1502 | next_ts = iter->ts; |
| 1503 | rel_usecs = ns2usecs(next_ts - iter->ts); |
| 1504 | abs_usecs = ns2usecs(iter->ts - iter->tr->time_start); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1505 | |
| 1506 | if (verbose) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1507 | comm = trace_find_cmdline(entry->pid); |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1508 | trace_seq_printf(s, "%16s %5d %3d %d %08x %08x [%08lx]" |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1509 | " %ld.%03ldms (+%ld.%03ldms): ", |
| 1510 | comm, |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1511 | entry->pid, cpu, entry->flags, |
| 1512 | entry->preempt_count, trace_idx, |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1513 | ns2usecs(iter->ts), |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1514 | abs_usecs/1000, |
| 1515 | abs_usecs % 1000, rel_usecs/1000, |
| 1516 | rel_usecs % 1000); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1517 | } else { |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1518 | lat_print_generic(s, entry, cpu); |
| 1519 | lat_print_timestamp(s, abs_usecs, rel_usecs); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1520 | } |
| 1521 | switch (entry->type) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1522 | case TRACE_FN: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1523 | struct ftrace_entry *field; |
| 1524 | |
| 1525 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1526 | |
| 1527 | seq_print_ip_sym(s, field->ip, sym_flags); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1528 | trace_seq_puts(s, " ("); |
Steven Rostedt | b3aa557 | 2008-10-31 15:44:07 -0400 | [diff] [blame] | 1529 | seq_print_ip_sym(s, field->parent_ip, sym_flags); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1530 | trace_seq_puts(s, ")\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1531 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1532 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1533 | case TRACE_CTX: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1534 | case TRACE_WAKE: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1535 | struct ctx_switch_entry *field; |
| 1536 | |
| 1537 | trace_assign_type(field, entry); |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1538 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1539 | T = field->next_state < sizeof(state_to_char) ? |
| 1540 | state_to_char[field->next_state] : 'X'; |
| 1541 | |
| 1542 | state = field->prev_state ? |
| 1543 | __ffs(field->prev_state) + 1 : 0; |
Ankita Garg | d17d969 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 1544 | S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X'; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1545 | comm = trace_find_cmdline(field->next_pid); |
Peter Zijlstra | 80b5e94 | 2008-09-04 10:24:16 +0200 | [diff] [blame] | 1546 | 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] | 1547 | field->prev_pid, |
| 1548 | field->prev_prio, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1549 | S, entry->type == TRACE_CTX ? "==>" : " +", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1550 | field->next_cpu, |
| 1551 | field->next_pid, |
| 1552 | field->next_prio, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1553 | T, comm); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1554 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1555 | } |
| 1556 | case TRACE_SPECIAL: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1557 | struct special_entry *field; |
| 1558 | |
| 1559 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1560 | |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1561 | trace_seq_printf(s, "# %ld %ld %ld\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1562 | field->arg1, |
| 1563 | field->arg2, |
| 1564 | field->arg3); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1565 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1566 | } |
| 1567 | case TRACE_STACK: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1568 | struct stack_entry *field; |
| 1569 | |
| 1570 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1571 | |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1572 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
| 1573 | if (i) |
| 1574 | trace_seq_puts(s, " <= "); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1575 | seq_print_ip_sym(s, field->caller[i], sym_flags); |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1576 | } |
| 1577 | trace_seq_puts(s, "\n"); |
| 1578 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1579 | } |
| 1580 | case TRACE_PRINT: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1581 | struct print_entry *field; |
| 1582 | |
| 1583 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1584 | |
| 1585 | seq_print_ip_sym(s, field->ip, sym_flags); |
| 1586 | trace_seq_printf(s, ": %s", field->buf); |
| 1587 | if (entry->flags & TRACE_FLAG_CONT) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1588 | trace_seq_print_cont(s, iter); |
| 1589 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1590 | } |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1591 | default: |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1592 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1593 | } |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1594 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1595 | } |
| 1596 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1597 | static enum print_line_t print_trace_fmt(struct trace_iterator *iter) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1598 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1599 | struct trace_seq *s = &iter->seq; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1600 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1601 | struct trace_entry *entry; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1602 | unsigned long usec_rem; |
| 1603 | unsigned long long t; |
| 1604 | unsigned long secs; |
| 1605 | char *comm; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1606 | int ret; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1607 | int S, T; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1608 | int i; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1609 | |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1610 | entry = iter->ent; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1611 | |
| 1612 | if (entry->type == TRACE_CONT) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1613 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1614 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1615 | comm = trace_find_cmdline(iter->ent->pid); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1616 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1617 | t = ns2usecs(iter->ts); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1618 | usec_rem = do_div(t, 1000000ULL); |
| 1619 | secs = (unsigned long)t; |
| 1620 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1621 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1622 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1623 | return TRACE_TYPE_PARTIAL_LINE; |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1624 | ret = trace_seq_printf(s, "[%03d] ", iter->cpu); |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1625 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1626 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1627 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); |
| 1628 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1629 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1630 | |
| 1631 | switch (entry->type) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1632 | case TRACE_FN: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1633 | struct ftrace_entry *field; |
| 1634 | |
| 1635 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1636 | |
| 1637 | ret = seq_print_ip_sym(s, field->ip, sym_flags); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1638 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1639 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1640 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1641 | field->parent_ip) { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1642 | ret = trace_seq_printf(s, " <-"); |
| 1643 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1644 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | b3aa557 | 2008-10-31 15:44:07 -0400 | [diff] [blame] | 1645 | ret = seq_print_ip_sym(s, |
| 1646 | field->parent_ip, |
| 1647 | sym_flags); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1648 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1649 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1650 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1651 | ret = trace_seq_printf(s, "\n"); |
| 1652 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1653 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1654 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1655 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1656 | case TRACE_CTX: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1657 | case TRACE_WAKE: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1658 | struct ctx_switch_entry *field; |
| 1659 | |
| 1660 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1661 | |
| 1662 | S = field->prev_state < sizeof(state_to_char) ? |
| 1663 | state_to_char[field->prev_state] : 'X'; |
| 1664 | T = field->next_state < sizeof(state_to_char) ? |
| 1665 | state_to_char[field->next_state] : 'X'; |
Peter Zijlstra | 80b5e94 | 2008-09-04 10:24:16 +0200 | [diff] [blame] | 1666 | 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] | 1667 | field->prev_pid, |
| 1668 | field->prev_prio, |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1669 | S, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1670 | entry->type == TRACE_CTX ? "==>" : " +", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1671 | field->next_cpu, |
| 1672 | field->next_pid, |
| 1673 | field->next_prio, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1674 | T); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1675 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1676 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1677 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1678 | } |
| 1679 | case TRACE_SPECIAL: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1680 | struct special_entry *field; |
| 1681 | |
| 1682 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1683 | |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1684 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1685 | field->arg1, |
| 1686 | field->arg2, |
| 1687 | field->arg3); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1688 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1689 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1690 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1691 | } |
| 1692 | case TRACE_STACK: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1693 | struct stack_entry *field; |
| 1694 | |
| 1695 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1696 | |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1697 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
| 1698 | if (i) { |
| 1699 | ret = trace_seq_puts(s, " <= "); |
| 1700 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1701 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1702 | } |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1703 | ret = seq_print_ip_sym(s, field->caller[i], |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1704 | sym_flags); |
| 1705 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1706 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1707 | } |
| 1708 | ret = trace_seq_puts(s, "\n"); |
| 1709 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1710 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1711 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1712 | } |
| 1713 | case TRACE_PRINT: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1714 | struct print_entry *field; |
| 1715 | |
| 1716 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1717 | |
| 1718 | seq_print_ip_sym(s, field->ip, sym_flags); |
| 1719 | trace_seq_printf(s, ": %s", field->buf); |
| 1720 | if (entry->flags & TRACE_FLAG_CONT) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1721 | trace_seq_print_cont(s, iter); |
| 1722 | break; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1723 | } |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1724 | } |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1725 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1726 | } |
| 1727 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1728 | static enum print_line_t print_raw_fmt(struct trace_iterator *iter) |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1729 | { |
| 1730 | struct trace_seq *s = &iter->seq; |
| 1731 | struct trace_entry *entry; |
| 1732 | int ret; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1733 | int S, T; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1734 | |
| 1735 | entry = iter->ent; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1736 | |
| 1737 | if (entry->type == TRACE_CONT) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1738 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1739 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1740 | ret = trace_seq_printf(s, "%d %d %llu ", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1741 | entry->pid, iter->cpu, iter->ts); |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1742 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1743 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1744 | |
| 1745 | switch (entry->type) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1746 | case TRACE_FN: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1747 | struct ftrace_entry *field; |
| 1748 | |
| 1749 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1750 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1751 | ret = trace_seq_printf(s, "%x %x\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1752 | field->ip, |
| 1753 | field->parent_ip); |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1754 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1755 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1756 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1757 | } |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1758 | case TRACE_CTX: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1759 | case TRACE_WAKE: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1760 | struct ctx_switch_entry *field; |
| 1761 | |
| 1762 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1763 | |
| 1764 | S = field->prev_state < sizeof(state_to_char) ? |
| 1765 | state_to_char[field->prev_state] : 'X'; |
| 1766 | T = field->next_state < sizeof(state_to_char) ? |
| 1767 | state_to_char[field->next_state] : 'X'; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1768 | if (entry->type == TRACE_WAKE) |
| 1769 | S = '+'; |
Peter Zijlstra | 80b5e94 | 2008-09-04 10:24:16 +0200 | [diff] [blame] | 1770 | 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] | 1771 | field->prev_pid, |
| 1772 | field->prev_prio, |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1773 | S, |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1774 | field->next_cpu, |
| 1775 | field->next_pid, |
| 1776 | field->next_prio, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1777 | T); |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1778 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1779 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1780 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1781 | } |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1782 | case TRACE_SPECIAL: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1783 | case TRACE_STACK: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1784 | struct special_entry *field; |
| 1785 | |
| 1786 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1787 | |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1788 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1789 | field->arg1, |
| 1790 | field->arg2, |
| 1791 | field->arg3); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1792 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1793 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1794 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1795 | } |
| 1796 | case TRACE_PRINT: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1797 | struct print_entry *field; |
| 1798 | |
| 1799 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1800 | |
| 1801 | trace_seq_printf(s, "# %lx %s", field->ip, field->buf); |
| 1802 | if (entry->flags & TRACE_FLAG_CONT) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1803 | trace_seq_print_cont(s, iter); |
| 1804 | break; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1805 | } |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1806 | } |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1807 | return TRACE_TYPE_HANDLED; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1808 | } |
| 1809 | |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1810 | #define SEQ_PUT_FIELD_RET(s, x) \ |
| 1811 | do { \ |
| 1812 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ |
| 1813 | return 0; \ |
| 1814 | } while (0) |
| 1815 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1816 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
| 1817 | do { \ |
Harvey Harrison | ad0a3b6 | 2008-10-08 17:44:55 -0700 | [diff] [blame] | 1818 | BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES); \ |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1819 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ |
| 1820 | return 0; \ |
| 1821 | } while (0) |
| 1822 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1823 | static enum print_line_t print_hex_fmt(struct trace_iterator *iter) |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1824 | { |
| 1825 | struct trace_seq *s = &iter->seq; |
| 1826 | unsigned char newline = '\n'; |
| 1827 | struct trace_entry *entry; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1828 | int S, T; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1829 | |
| 1830 | entry = iter->ent; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1831 | |
| 1832 | if (entry->type == TRACE_CONT) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1833 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1834 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1835 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1836 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1837 | SEQ_PUT_HEX_FIELD_RET(s, iter->ts); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1838 | |
| 1839 | switch (entry->type) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1840 | case TRACE_FN: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1841 | struct ftrace_entry *field; |
| 1842 | |
| 1843 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1844 | |
| 1845 | SEQ_PUT_HEX_FIELD_RET(s, field->ip); |
| 1846 | SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1847 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1848 | } |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +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'; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1859 | if (entry->type == TRACE_WAKE) |
| 1860 | S = '+'; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1861 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid); |
| 1862 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1863 | SEQ_PUT_HEX_FIELD_RET(s, S); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1864 | SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu); |
| 1865 | SEQ_PUT_HEX_FIELD_RET(s, field->next_pid); |
| 1866 | SEQ_PUT_HEX_FIELD_RET(s, field->next_prio); |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1867 | SEQ_PUT_HEX_FIELD_RET(s, T); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1868 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1869 | } |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1870 | case TRACE_SPECIAL: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1871 | case TRACE_STACK: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1872 | struct special_entry *field; |
| 1873 | |
| 1874 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1875 | |
| 1876 | SEQ_PUT_HEX_FIELD_RET(s, field->arg1); |
| 1877 | SEQ_PUT_HEX_FIELD_RET(s, field->arg2); |
| 1878 | SEQ_PUT_HEX_FIELD_RET(s, field->arg3); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1879 | break; |
| 1880 | } |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1881 | } |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1882 | SEQ_PUT_FIELD_RET(s, newline); |
| 1883 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1884 | return TRACE_TYPE_HANDLED; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1885 | } |
| 1886 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1887 | static enum print_line_t print_bin_fmt(struct trace_iterator *iter) |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1888 | { |
| 1889 | struct trace_seq *s = &iter->seq; |
| 1890 | struct trace_entry *entry; |
| 1891 | |
| 1892 | entry = iter->ent; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1893 | |
| 1894 | if (entry->type == TRACE_CONT) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1895 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1896 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1897 | SEQ_PUT_FIELD_RET(s, entry->pid); |
Eric Anholt | 072ba49 | 2008-10-26 15:26:57 -0700 | [diff] [blame] | 1898 | SEQ_PUT_FIELD_RET(s, entry->cpu); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1899 | SEQ_PUT_FIELD_RET(s, iter->ts); |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1900 | |
| 1901 | switch (entry->type) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1902 | case TRACE_FN: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1903 | struct ftrace_entry *field; |
| 1904 | |
| 1905 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1906 | |
| 1907 | SEQ_PUT_FIELD_RET(s, field->ip); |
| 1908 | SEQ_PUT_FIELD_RET(s, field->parent_ip); |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1909 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1910 | } |
| 1911 | case TRACE_CTX: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1912 | struct ctx_switch_entry *field; |
| 1913 | |
| 1914 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1915 | |
| 1916 | SEQ_PUT_FIELD_RET(s, field->prev_pid); |
| 1917 | SEQ_PUT_FIELD_RET(s, field->prev_prio); |
| 1918 | SEQ_PUT_FIELD_RET(s, field->prev_state); |
| 1919 | SEQ_PUT_FIELD_RET(s, field->next_pid); |
| 1920 | SEQ_PUT_FIELD_RET(s, field->next_prio); |
| 1921 | SEQ_PUT_FIELD_RET(s, field->next_state); |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1922 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1923 | } |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1924 | case TRACE_SPECIAL: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1925 | case TRACE_STACK: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1926 | struct special_entry *field; |
| 1927 | |
| 1928 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1929 | |
| 1930 | SEQ_PUT_FIELD_RET(s, field->arg1); |
| 1931 | SEQ_PUT_FIELD_RET(s, field->arg2); |
| 1932 | SEQ_PUT_FIELD_RET(s, field->arg3); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1933 | break; |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1934 | } |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1935 | } |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1936 | return 1; |
| 1937 | } |
| 1938 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1939 | static int trace_empty(struct trace_iterator *iter) |
| 1940 | { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1941 | int cpu; |
| 1942 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1943 | for_each_tracing_cpu(cpu) { |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1944 | if (iter->buffer_iter[cpu]) { |
| 1945 | if (!ring_buffer_iter_empty(iter->buffer_iter[cpu])) |
| 1946 | return 0; |
| 1947 | } else { |
| 1948 | if (!ring_buffer_empty_cpu(iter->tr->buffer, cpu)) |
| 1949 | return 0; |
| 1950 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1951 | } |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1952 | |
Frederic Weisbecker | 797d371 | 2008-09-30 18:13:45 +0200 | [diff] [blame] | 1953 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1954 | } |
| 1955 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1956 | static enum print_line_t print_trace_line(struct trace_iterator *iter) |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1957 | { |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1958 | enum print_line_t ret; |
| 1959 | |
| 1960 | if (iter->trace && iter->trace->print_line) { |
| 1961 | ret = iter->trace->print_line(iter); |
| 1962 | if (ret != TRACE_TYPE_UNHANDLED) |
| 1963 | return ret; |
| 1964 | } |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 1965 | |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1966 | if (trace_flags & TRACE_ITER_BIN) |
| 1967 | return print_bin_fmt(iter); |
| 1968 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1969 | if (trace_flags & TRACE_ITER_HEX) |
| 1970 | return print_hex_fmt(iter); |
| 1971 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1972 | if (trace_flags & TRACE_ITER_RAW) |
| 1973 | return print_raw_fmt(iter); |
| 1974 | |
| 1975 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) |
| 1976 | return print_lat_fmt(iter, iter->idx, iter->cpu); |
| 1977 | |
| 1978 | return print_trace_fmt(iter); |
| 1979 | } |
| 1980 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1981 | static int s_show(struct seq_file *m, void *v) |
| 1982 | { |
| 1983 | struct trace_iterator *iter = v; |
| 1984 | |
| 1985 | if (iter->ent == NULL) { |
| 1986 | if (iter->tr) { |
| 1987 | seq_printf(m, "# tracer: %s\n", iter->trace->name); |
| 1988 | seq_puts(m, "#\n"); |
| 1989 | } |
| 1990 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { |
| 1991 | /* print nothing if the buffers are empty */ |
| 1992 | if (trace_empty(iter)) |
| 1993 | return 0; |
| 1994 | print_trace_header(m, iter); |
| 1995 | if (!(trace_flags & TRACE_ITER_VERBOSE)) |
| 1996 | print_lat_help_header(m); |
| 1997 | } else { |
| 1998 | if (!(trace_flags & TRACE_ITER_VERBOSE)) |
| 1999 | print_func_help_header(m); |
| 2000 | } |
| 2001 | } else { |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2002 | print_trace_line(iter); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2003 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2004 | } |
| 2005 | |
| 2006 | return 0; |
| 2007 | } |
| 2008 | |
| 2009 | static struct seq_operations tracer_seq_ops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2010 | .start = s_start, |
| 2011 | .next = s_next, |
| 2012 | .stop = s_stop, |
| 2013 | .show = s_show, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2014 | }; |
| 2015 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 2016 | static struct trace_iterator * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2017 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
| 2018 | { |
| 2019 | struct trace_iterator *iter; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2020 | struct seq_file *m; |
| 2021 | int cpu; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2022 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2023 | if (tracing_disabled) { |
| 2024 | *ret = -ENODEV; |
| 2025 | return NULL; |
| 2026 | } |
| 2027 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2028 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 2029 | if (!iter) { |
| 2030 | *ret = -ENOMEM; |
| 2031 | goto out; |
| 2032 | } |
| 2033 | |
| 2034 | mutex_lock(&trace_types_lock); |
| 2035 | if (current_trace && current_trace->print_max) |
| 2036 | iter->tr = &max_tr; |
| 2037 | else |
| 2038 | iter->tr = inode->i_private; |
| 2039 | iter->trace = current_trace; |
| 2040 | iter->pos = -1; |
| 2041 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2042 | for_each_tracing_cpu(cpu) { |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 2043 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2044 | iter->buffer_iter[cpu] = |
| 2045 | ring_buffer_read_start(iter->tr->buffer, cpu); |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 2046 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2047 | if (!iter->buffer_iter[cpu]) |
| 2048 | goto fail_buffer; |
| 2049 | } |
| 2050 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2051 | /* TODO stop tracer */ |
| 2052 | *ret = seq_open(file, &tracer_seq_ops); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2053 | if (*ret) |
| 2054 | goto fail_buffer; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2055 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2056 | m = file->private_data; |
| 2057 | m->private = iter; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2058 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2059 | /* stop the trace while dumping */ |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 2060 | tracing_stop(); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2061 | |
| 2062 | if (iter->trace && iter->trace->open) |
| 2063 | iter->trace->open(iter); |
| 2064 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2065 | mutex_unlock(&trace_types_lock); |
| 2066 | |
| 2067 | out: |
| 2068 | return iter; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2069 | |
| 2070 | fail_buffer: |
| 2071 | for_each_tracing_cpu(cpu) { |
| 2072 | if (iter->buffer_iter[cpu]) |
| 2073 | ring_buffer_read_finish(iter->buffer_iter[cpu]); |
| 2074 | } |
| 2075 | mutex_unlock(&trace_types_lock); |
| 2076 | |
| 2077 | return ERR_PTR(-ENOMEM); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2078 | } |
| 2079 | |
| 2080 | int tracing_open_generic(struct inode *inode, struct file *filp) |
| 2081 | { |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2082 | if (tracing_disabled) |
| 2083 | return -ENODEV; |
| 2084 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2085 | filp->private_data = inode->i_private; |
| 2086 | return 0; |
| 2087 | } |
| 2088 | |
| 2089 | int tracing_release(struct inode *inode, struct file *file) |
| 2090 | { |
| 2091 | struct seq_file *m = (struct seq_file *)file->private_data; |
| 2092 | struct trace_iterator *iter = m->private; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2093 | int cpu; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2094 | |
| 2095 | mutex_lock(&trace_types_lock); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2096 | for_each_tracing_cpu(cpu) { |
| 2097 | if (iter->buffer_iter[cpu]) |
| 2098 | ring_buffer_read_finish(iter->buffer_iter[cpu]); |
| 2099 | } |
| 2100 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2101 | if (iter->trace && iter->trace->close) |
| 2102 | iter->trace->close(iter); |
| 2103 | |
| 2104 | /* reenable tracing if it was previously enabled */ |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 2105 | tracing_start(); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2106 | mutex_unlock(&trace_types_lock); |
| 2107 | |
| 2108 | seq_release(inode, file); |
| 2109 | kfree(iter); |
| 2110 | return 0; |
| 2111 | } |
| 2112 | |
| 2113 | static int tracing_open(struct inode *inode, struct file *file) |
| 2114 | { |
| 2115 | int ret; |
| 2116 | |
| 2117 | __tracing_open(inode, file, &ret); |
| 2118 | |
| 2119 | return ret; |
| 2120 | } |
| 2121 | |
| 2122 | static int tracing_lt_open(struct inode *inode, struct file *file) |
| 2123 | { |
| 2124 | struct trace_iterator *iter; |
| 2125 | int ret; |
| 2126 | |
| 2127 | iter = __tracing_open(inode, file, &ret); |
| 2128 | |
| 2129 | if (!ret) |
| 2130 | iter->iter_flags |= TRACE_FILE_LAT_FMT; |
| 2131 | |
| 2132 | return ret; |
| 2133 | } |
| 2134 | |
| 2135 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 2136 | static void * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2137 | t_next(struct seq_file *m, void *v, loff_t *pos) |
| 2138 | { |
| 2139 | struct tracer *t = m->private; |
| 2140 | |
| 2141 | (*pos)++; |
| 2142 | |
| 2143 | if (t) |
| 2144 | t = t->next; |
| 2145 | |
| 2146 | m->private = t; |
| 2147 | |
| 2148 | return t; |
| 2149 | } |
| 2150 | |
| 2151 | static void *t_start(struct seq_file *m, loff_t *pos) |
| 2152 | { |
| 2153 | struct tracer *t = m->private; |
| 2154 | loff_t l = 0; |
| 2155 | |
| 2156 | mutex_lock(&trace_types_lock); |
| 2157 | for (; t && l < *pos; t = t_next(m, t, &l)) |
| 2158 | ; |
| 2159 | |
| 2160 | return t; |
| 2161 | } |
| 2162 | |
| 2163 | static void t_stop(struct seq_file *m, void *p) |
| 2164 | { |
| 2165 | mutex_unlock(&trace_types_lock); |
| 2166 | } |
| 2167 | |
| 2168 | static int t_show(struct seq_file *m, void *v) |
| 2169 | { |
| 2170 | struct tracer *t = v; |
| 2171 | |
| 2172 | if (!t) |
| 2173 | return 0; |
| 2174 | |
| 2175 | seq_printf(m, "%s", t->name); |
| 2176 | if (t->next) |
| 2177 | seq_putc(m, ' '); |
| 2178 | else |
| 2179 | seq_putc(m, '\n'); |
| 2180 | |
| 2181 | return 0; |
| 2182 | } |
| 2183 | |
| 2184 | static struct seq_operations show_traces_seq_ops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2185 | .start = t_start, |
| 2186 | .next = t_next, |
| 2187 | .stop = t_stop, |
| 2188 | .show = t_show, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2189 | }; |
| 2190 | |
| 2191 | static int show_traces_open(struct inode *inode, struct file *file) |
| 2192 | { |
| 2193 | int ret; |
| 2194 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2195 | if (tracing_disabled) |
| 2196 | return -ENODEV; |
| 2197 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2198 | ret = seq_open(file, &show_traces_seq_ops); |
| 2199 | if (!ret) { |
| 2200 | struct seq_file *m = file->private_data; |
| 2201 | m->private = trace_types; |
| 2202 | } |
| 2203 | |
| 2204 | return ret; |
| 2205 | } |
| 2206 | |
| 2207 | static struct file_operations tracing_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2208 | .open = tracing_open, |
| 2209 | .read = seq_read, |
| 2210 | .llseek = seq_lseek, |
| 2211 | .release = tracing_release, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2212 | }; |
| 2213 | |
| 2214 | static struct file_operations tracing_lt_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2215 | .open = tracing_lt_open, |
| 2216 | .read = seq_read, |
| 2217 | .llseek = seq_lseek, |
| 2218 | .release = tracing_release, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2219 | }; |
| 2220 | |
| 2221 | static struct file_operations show_traces_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2222 | .open = show_traces_open, |
| 2223 | .read = seq_read, |
| 2224 | .release = seq_release, |
| 2225 | }; |
| 2226 | |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2227 | /* |
| 2228 | * Only trace on a CPU if the bitmask is set: |
| 2229 | */ |
| 2230 | static cpumask_t tracing_cpumask = CPU_MASK_ALL; |
| 2231 | |
| 2232 | /* |
| 2233 | * When tracing/tracing_cpu_mask is modified then this holds |
| 2234 | * the new bitmask we are about to install: |
| 2235 | */ |
| 2236 | static cpumask_t tracing_cpumask_new; |
| 2237 | |
| 2238 | /* |
| 2239 | * The tracer itself will not take this lock, but still we want |
| 2240 | * to provide a consistent cpumask to user-space: |
| 2241 | */ |
| 2242 | static DEFINE_MUTEX(tracing_cpumask_update_lock); |
| 2243 | |
| 2244 | /* |
| 2245 | * Temporary storage for the character representation of the |
| 2246 | * CPU bitmask (and one more byte for the newline): |
| 2247 | */ |
| 2248 | static char mask_str[NR_CPUS + 1]; |
| 2249 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2250 | static ssize_t |
| 2251 | tracing_cpumask_read(struct file *filp, char __user *ubuf, |
| 2252 | size_t count, loff_t *ppos) |
| 2253 | { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2254 | int len; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2255 | |
| 2256 | mutex_lock(&tracing_cpumask_update_lock); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2257 | |
| 2258 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); |
| 2259 | if (count - len < 2) { |
| 2260 | count = -EINVAL; |
| 2261 | goto out_err; |
| 2262 | } |
| 2263 | len += sprintf(mask_str + len, "\n"); |
| 2264 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); |
| 2265 | |
| 2266 | out_err: |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2267 | mutex_unlock(&tracing_cpumask_update_lock); |
| 2268 | |
| 2269 | return count; |
| 2270 | } |
| 2271 | |
| 2272 | static ssize_t |
| 2273 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, |
| 2274 | size_t count, loff_t *ppos) |
| 2275 | { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2276 | int err, cpu; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2277 | |
| 2278 | mutex_lock(&tracing_cpumask_update_lock); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2279 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
| 2280 | if (err) |
| 2281 | goto err_unlock; |
| 2282 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2283 | raw_local_irq_disable(); |
| 2284 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2285 | for_each_tracing_cpu(cpu) { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2286 | /* |
| 2287 | * Increase/decrease the disabled counter if we are |
| 2288 | * about to flip a bit in the cpumask: |
| 2289 | */ |
| 2290 | if (cpu_isset(cpu, tracing_cpumask) && |
| 2291 | !cpu_isset(cpu, tracing_cpumask_new)) { |
| 2292 | atomic_inc(&global_trace.data[cpu]->disabled); |
| 2293 | } |
| 2294 | if (!cpu_isset(cpu, tracing_cpumask) && |
| 2295 | cpu_isset(cpu, tracing_cpumask_new)) { |
| 2296 | atomic_dec(&global_trace.data[cpu]->disabled); |
| 2297 | } |
| 2298 | } |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2299 | __raw_spin_unlock(&ftrace_max_lock); |
| 2300 | raw_local_irq_enable(); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2301 | |
| 2302 | tracing_cpumask = tracing_cpumask_new; |
| 2303 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2304 | mutex_unlock(&tracing_cpumask_update_lock); |
| 2305 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2306 | return count; |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2307 | |
| 2308 | err_unlock: |
| 2309 | mutex_unlock(&tracing_cpumask_update_lock); |
| 2310 | |
| 2311 | return err; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2312 | } |
| 2313 | |
| 2314 | static struct file_operations tracing_cpumask_fops = { |
| 2315 | .open = tracing_open_generic, |
| 2316 | .read = tracing_cpumask_read, |
| 2317 | .write = tracing_cpumask_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2318 | }; |
| 2319 | |
| 2320 | static ssize_t |
| 2321 | tracing_iter_ctrl_read(struct file *filp, char __user *ubuf, |
| 2322 | size_t cnt, loff_t *ppos) |
| 2323 | { |
| 2324 | char *buf; |
| 2325 | int r = 0; |
| 2326 | int len = 0; |
| 2327 | int i; |
| 2328 | |
| 2329 | /* calulate max size */ |
| 2330 | for (i = 0; trace_options[i]; i++) { |
| 2331 | len += strlen(trace_options[i]); |
| 2332 | len += 3; /* "no" and space */ |
| 2333 | } |
| 2334 | |
| 2335 | /* +2 for \n and \0 */ |
| 2336 | buf = kmalloc(len + 2, GFP_KERNEL); |
| 2337 | if (!buf) |
| 2338 | return -ENOMEM; |
| 2339 | |
| 2340 | for (i = 0; trace_options[i]; i++) { |
| 2341 | if (trace_flags & (1 << i)) |
| 2342 | r += sprintf(buf + r, "%s ", trace_options[i]); |
| 2343 | else |
| 2344 | r += sprintf(buf + r, "no%s ", trace_options[i]); |
| 2345 | } |
| 2346 | |
| 2347 | r += sprintf(buf + r, "\n"); |
| 2348 | WARN_ON(r >= len + 2); |
| 2349 | |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2350 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2351 | |
| 2352 | kfree(buf); |
| 2353 | |
| 2354 | return r; |
| 2355 | } |
| 2356 | |
| 2357 | static ssize_t |
| 2358 | tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf, |
| 2359 | size_t cnt, loff_t *ppos) |
| 2360 | { |
| 2361 | char buf[64]; |
| 2362 | char *cmp = buf; |
| 2363 | int neg = 0; |
| 2364 | int i; |
| 2365 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2366 | if (cnt >= sizeof(buf)) |
| 2367 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2368 | |
| 2369 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2370 | return -EFAULT; |
| 2371 | |
| 2372 | buf[cnt] = 0; |
| 2373 | |
| 2374 | if (strncmp(buf, "no", 2) == 0) { |
| 2375 | neg = 1; |
| 2376 | cmp += 2; |
| 2377 | } |
| 2378 | |
| 2379 | for (i = 0; trace_options[i]; i++) { |
| 2380 | int len = strlen(trace_options[i]); |
| 2381 | |
| 2382 | if (strncmp(cmp, trace_options[i], len) == 0) { |
| 2383 | if (neg) |
| 2384 | trace_flags &= ~(1 << i); |
| 2385 | else |
| 2386 | trace_flags |= (1 << i); |
| 2387 | break; |
| 2388 | } |
| 2389 | } |
Ingo Molnar | 442e544 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 2390 | /* |
| 2391 | * If no option could be set, return an error: |
| 2392 | */ |
| 2393 | if (!trace_options[i]) |
| 2394 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2395 | |
| 2396 | filp->f_pos += cnt; |
| 2397 | |
| 2398 | return cnt; |
| 2399 | } |
| 2400 | |
| 2401 | static struct file_operations tracing_iter_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2402 | .open = tracing_open_generic, |
| 2403 | .read = tracing_iter_ctrl_read, |
| 2404 | .write = tracing_iter_ctrl_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2405 | }; |
| 2406 | |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2407 | static const char readme_msg[] = |
| 2408 | "tracing mini-HOWTO:\n\n" |
| 2409 | "# mkdir /debug\n" |
| 2410 | "# mount -t debugfs nodev /debug\n\n" |
| 2411 | "# cat /debug/tracing/available_tracers\n" |
| 2412 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" |
| 2413 | "# cat /debug/tracing/current_tracer\n" |
| 2414 | "none\n" |
| 2415 | "# echo sched_switch > /debug/tracing/current_tracer\n" |
| 2416 | "# cat /debug/tracing/current_tracer\n" |
| 2417 | "sched_switch\n" |
| 2418 | "# cat /debug/tracing/iter_ctrl\n" |
| 2419 | "noprint-parent nosym-offset nosym-addr noverbose\n" |
| 2420 | "# echo print-parent > /debug/tracing/iter_ctrl\n" |
| 2421 | "# echo 1 > /debug/tracing/tracing_enabled\n" |
| 2422 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" |
| 2423 | "echo 0 > /debug/tracing/tracing_enabled\n" |
| 2424 | ; |
| 2425 | |
| 2426 | static ssize_t |
| 2427 | tracing_readme_read(struct file *filp, char __user *ubuf, |
| 2428 | size_t cnt, loff_t *ppos) |
| 2429 | { |
| 2430 | return simple_read_from_buffer(ubuf, cnt, ppos, |
| 2431 | readme_msg, strlen(readme_msg)); |
| 2432 | } |
| 2433 | |
| 2434 | static struct file_operations tracing_readme_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2435 | .open = tracing_open_generic, |
| 2436 | .read = tracing_readme_read, |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2437 | }; |
| 2438 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2439 | static ssize_t |
| 2440 | tracing_ctrl_read(struct file *filp, char __user *ubuf, |
| 2441 | size_t cnt, loff_t *ppos) |
| 2442 | { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2443 | char buf[64]; |
| 2444 | int r; |
| 2445 | |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 2446 | r = sprintf(buf, "%u\n", tracer_enabled); |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2447 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2448 | } |
| 2449 | |
| 2450 | static ssize_t |
| 2451 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, |
| 2452 | size_t cnt, loff_t *ppos) |
| 2453 | { |
| 2454 | struct trace_array *tr = filp->private_data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2455 | char buf[64]; |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2456 | long val; |
| 2457 | int ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2458 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2459 | if (cnt >= sizeof(buf)) |
| 2460 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2461 | |
| 2462 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2463 | return -EFAULT; |
| 2464 | |
| 2465 | buf[cnt] = 0; |
| 2466 | |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2467 | ret = strict_strtoul(buf, 10, &val); |
| 2468 | if (ret < 0) |
| 2469 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2470 | |
| 2471 | val = !!val; |
| 2472 | |
| 2473 | mutex_lock(&trace_types_lock); |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 2474 | if (tracer_enabled ^ val) { |
| 2475 | if (val) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2476 | tracer_enabled = 1; |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 2477 | if (current_trace->start) |
| 2478 | current_trace->start(tr); |
| 2479 | tracing_start(); |
| 2480 | } else { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2481 | tracer_enabled = 0; |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 2482 | tracing_stop(); |
| 2483 | if (current_trace->stop) |
| 2484 | current_trace->stop(tr); |
| 2485 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2486 | } |
| 2487 | mutex_unlock(&trace_types_lock); |
| 2488 | |
| 2489 | filp->f_pos += cnt; |
| 2490 | |
| 2491 | return cnt; |
| 2492 | } |
| 2493 | |
| 2494 | static ssize_t |
| 2495 | tracing_set_trace_read(struct file *filp, char __user *ubuf, |
| 2496 | size_t cnt, loff_t *ppos) |
| 2497 | { |
| 2498 | char buf[max_tracer_type_len+2]; |
| 2499 | int r; |
| 2500 | |
| 2501 | mutex_lock(&trace_types_lock); |
| 2502 | if (current_trace) |
| 2503 | r = sprintf(buf, "%s\n", current_trace->name); |
| 2504 | else |
| 2505 | r = sprintf(buf, "\n"); |
| 2506 | mutex_unlock(&trace_types_lock); |
| 2507 | |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2508 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2509 | } |
| 2510 | |
Peter Zijlstra | d9e5407 | 2008-11-01 19:57:37 +0100 | [diff] [blame] | 2511 | static int tracing_set_tracer(char *buf) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2512 | { |
| 2513 | struct trace_array *tr = &global_trace; |
| 2514 | struct tracer *t; |
Peter Zijlstra | d9e5407 | 2008-11-01 19:57:37 +0100 | [diff] [blame] | 2515 | int ret = 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2516 | |
| 2517 | mutex_lock(&trace_types_lock); |
| 2518 | for (t = trace_types; t; t = t->next) { |
| 2519 | if (strcmp(t->name, buf) == 0) |
| 2520 | break; |
| 2521 | } |
Frederic Weisbecker | c2931e0 | 2008-10-04 22:04:44 +0200 | [diff] [blame] | 2522 | if (!t) { |
| 2523 | ret = -EINVAL; |
| 2524 | goto out; |
| 2525 | } |
| 2526 | if (t == current_trace) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2527 | goto out; |
| 2528 | |
| 2529 | if (current_trace && current_trace->reset) |
| 2530 | current_trace->reset(tr); |
| 2531 | |
| 2532 | current_trace = t; |
| 2533 | if (t->init) |
| 2534 | t->init(tr); |
| 2535 | |
| 2536 | out: |
| 2537 | mutex_unlock(&trace_types_lock); |
| 2538 | |
Peter Zijlstra | d9e5407 | 2008-11-01 19:57:37 +0100 | [diff] [blame] | 2539 | return ret; |
| 2540 | } |
| 2541 | |
| 2542 | static ssize_t |
| 2543 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, |
| 2544 | size_t cnt, loff_t *ppos) |
| 2545 | { |
| 2546 | char buf[max_tracer_type_len+1]; |
| 2547 | int i; |
| 2548 | size_t ret; |
| 2549 | |
| 2550 | if (cnt > max_tracer_type_len) |
| 2551 | cnt = max_tracer_type_len; |
| 2552 | |
| 2553 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2554 | return -EFAULT; |
| 2555 | |
| 2556 | buf[cnt] = 0; |
| 2557 | |
| 2558 | /* strip ending whitespace. */ |
| 2559 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) |
| 2560 | buf[i] = 0; |
| 2561 | |
| 2562 | ret = tracing_set_tracer(buf); |
| 2563 | if (!ret) |
| 2564 | ret = cnt; |
| 2565 | |
Steven Rostedt | 60063a6 | 2008-10-28 10:44:24 -0400 | [diff] [blame] | 2566 | if (ret > 0) |
| 2567 | filp->f_pos += ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2568 | |
Frederic Weisbecker | c2931e0 | 2008-10-04 22:04:44 +0200 | [diff] [blame] | 2569 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2570 | } |
| 2571 | |
| 2572 | static ssize_t |
| 2573 | tracing_max_lat_read(struct file *filp, char __user *ubuf, |
| 2574 | size_t cnt, loff_t *ppos) |
| 2575 | { |
| 2576 | unsigned long *ptr = filp->private_data; |
| 2577 | char buf[64]; |
| 2578 | int r; |
| 2579 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2580 | r = snprintf(buf, sizeof(buf), "%ld\n", |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2581 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2582 | if (r > sizeof(buf)) |
| 2583 | r = sizeof(buf); |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2584 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2585 | } |
| 2586 | |
| 2587 | static ssize_t |
| 2588 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, |
| 2589 | size_t cnt, loff_t *ppos) |
| 2590 | { |
| 2591 | long *ptr = filp->private_data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2592 | char buf[64]; |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2593 | long val; |
| 2594 | int ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2595 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2596 | if (cnt >= sizeof(buf)) |
| 2597 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2598 | |
| 2599 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2600 | return -EFAULT; |
| 2601 | |
| 2602 | buf[cnt] = 0; |
| 2603 | |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2604 | ret = strict_strtoul(buf, 10, &val); |
| 2605 | if (ret < 0) |
| 2606 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2607 | |
| 2608 | *ptr = val * 1000; |
| 2609 | |
| 2610 | return cnt; |
| 2611 | } |
| 2612 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2613 | static atomic_t tracing_reader; |
| 2614 | |
| 2615 | static int tracing_open_pipe(struct inode *inode, struct file *filp) |
| 2616 | { |
| 2617 | struct trace_iterator *iter; |
| 2618 | |
| 2619 | if (tracing_disabled) |
| 2620 | return -ENODEV; |
| 2621 | |
| 2622 | /* We only allow for reader of the pipe */ |
| 2623 | if (atomic_inc_return(&tracing_reader) != 1) { |
| 2624 | atomic_dec(&tracing_reader); |
| 2625 | return -EBUSY; |
| 2626 | } |
| 2627 | |
| 2628 | /* create a buffer to store the information to pass to userspace */ |
| 2629 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 2630 | if (!iter) |
| 2631 | return -ENOMEM; |
| 2632 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2633 | mutex_lock(&trace_types_lock); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2634 | iter->tr = &global_trace; |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 2635 | iter->trace = current_trace; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2636 | filp->private_data = iter; |
| 2637 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2638 | if (iter->trace->pipe_open) |
| 2639 | iter->trace->pipe_open(iter); |
| 2640 | mutex_unlock(&trace_types_lock); |
| 2641 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2642 | return 0; |
| 2643 | } |
| 2644 | |
| 2645 | static int tracing_release_pipe(struct inode *inode, struct file *file) |
| 2646 | { |
| 2647 | struct trace_iterator *iter = file->private_data; |
| 2648 | |
| 2649 | kfree(iter); |
| 2650 | atomic_dec(&tracing_reader); |
| 2651 | |
| 2652 | return 0; |
| 2653 | } |
| 2654 | |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2655 | static unsigned int |
| 2656 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) |
| 2657 | { |
| 2658 | struct trace_iterator *iter = filp->private_data; |
| 2659 | |
| 2660 | if (trace_flags & TRACE_ITER_BLOCK) { |
| 2661 | /* |
| 2662 | * Always select as readable when in blocking mode |
| 2663 | */ |
| 2664 | return POLLIN | POLLRDNORM; |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2665 | } else { |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2666 | if (!trace_empty(iter)) |
| 2667 | return POLLIN | POLLRDNORM; |
| 2668 | poll_wait(filp, &trace_wait, poll_table); |
| 2669 | if (!trace_empty(iter)) |
| 2670 | return POLLIN | POLLRDNORM; |
| 2671 | |
| 2672 | return 0; |
| 2673 | } |
| 2674 | } |
| 2675 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2676 | /* |
| 2677 | * Consumer reader. |
| 2678 | */ |
| 2679 | static ssize_t |
| 2680 | tracing_read_pipe(struct file *filp, char __user *ubuf, |
| 2681 | size_t cnt, loff_t *ppos) |
| 2682 | { |
| 2683 | struct trace_iterator *iter = filp->private_data; |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2684 | ssize_t sret; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2685 | |
| 2686 | /* return any leftover data */ |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2687 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
| 2688 | if (sret != -EBUSY) |
| 2689 | return sret; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2690 | |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2691 | trace_seq_reset(&iter->seq); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2692 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2693 | mutex_lock(&trace_types_lock); |
| 2694 | if (iter->trace->read) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2695 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); |
| 2696 | if (sret) |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2697 | goto out; |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2698 | } |
| 2699 | |
Pekka Paalanen | 9ff4b97 | 2008-09-29 20:23:48 +0200 | [diff] [blame] | 2700 | waitagain: |
| 2701 | sret = 0; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2702 | while (trace_empty(iter)) { |
Steven Rostedt | 2dc8f09 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2703 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2704 | if ((filp->f_flags & O_NONBLOCK)) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2705 | sret = -EAGAIN; |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2706 | goto out; |
| 2707 | } |
Steven Rostedt | 2dc8f09 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2708 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2709 | /* |
| 2710 | * This is a make-shift waitqueue. The reason we don't use |
| 2711 | * an actual wait queue is because: |
| 2712 | * 1) we only ever have one waiter |
| 2713 | * 2) the tracing, traces all functions, we don't want |
| 2714 | * the overhead of calling wake_up and friends |
| 2715 | * (and tracing them too) |
| 2716 | * Anyway, this is really very primitive wakeup. |
| 2717 | */ |
| 2718 | set_current_state(TASK_INTERRUPTIBLE); |
| 2719 | iter->tr->waiter = current; |
| 2720 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2721 | mutex_unlock(&trace_types_lock); |
| 2722 | |
Ingo Molnar | 9fe068e | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2723 | /* sleep for 100 msecs, and try again. */ |
| 2724 | schedule_timeout(HZ/10); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2725 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2726 | mutex_lock(&trace_types_lock); |
| 2727 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2728 | iter->tr->waiter = NULL; |
| 2729 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2730 | if (signal_pending(current)) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2731 | sret = -EINTR; |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2732 | goto out; |
| 2733 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2734 | |
Steven Rostedt | 8452799 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2735 | if (iter->trace != current_trace) |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2736 | goto out; |
Steven Rostedt | 8452799 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2737 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2738 | /* |
| 2739 | * We block until we read something and tracing is disabled. |
| 2740 | * We still block if tracing is disabled, but we have never |
| 2741 | * read anything. This allows a user to cat this file, and |
| 2742 | * then enable tracing. But after we have read something, |
| 2743 | * we give an EOF when tracing is again disabled. |
| 2744 | * |
| 2745 | * iter->pos will be 0 if we haven't read anything. |
| 2746 | */ |
| 2747 | if (!tracer_enabled && iter->pos) |
| 2748 | break; |
| 2749 | |
| 2750 | continue; |
| 2751 | } |
| 2752 | |
| 2753 | /* stop when tracing is finished */ |
| 2754 | if (trace_empty(iter)) |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2755 | goto out; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2756 | |
| 2757 | if (cnt >= PAGE_SIZE) |
| 2758 | cnt = PAGE_SIZE - 1; |
| 2759 | |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2760 | /* reset all but tr, trace, and overruns */ |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2761 | memset(&iter->seq, 0, |
| 2762 | sizeof(struct trace_iterator) - |
| 2763 | offsetof(struct trace_iterator, seq)); |
Steven Rostedt | 4823ed7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2764 | iter->pos = -1; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2765 | |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2766 | while (find_next_entry_inc(iter) != NULL) { |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 2767 | enum print_line_t ret; |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2768 | int len = iter->seq.len; |
| 2769 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2770 | ret = print_trace_line(iter); |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 2771 | if (ret == TRACE_TYPE_PARTIAL_LINE) { |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2772 | /* don't print partial lines */ |
| 2773 | iter->seq.len = len; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2774 | break; |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2775 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2776 | |
| 2777 | trace_consume(iter); |
| 2778 | |
| 2779 | if (iter->seq.len >= cnt) |
| 2780 | break; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2781 | } |
| 2782 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2783 | /* Now copy what we have to the user */ |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2784 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
| 2785 | if (iter->seq.readpos >= iter->seq.len) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2786 | trace_seq_reset(&iter->seq); |
Pekka Paalanen | 9ff4b97 | 2008-09-29 20:23:48 +0200 | [diff] [blame] | 2787 | |
| 2788 | /* |
| 2789 | * If there was nothing to send to user, inspite of consuming trace |
| 2790 | * entries, go back to wait for more entries. |
| 2791 | */ |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2792 | if (sret == -EBUSY) |
Pekka Paalanen | 9ff4b97 | 2008-09-29 20:23:48 +0200 | [diff] [blame] | 2793 | goto waitagain; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2794 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2795 | out: |
| 2796 | mutex_unlock(&trace_types_lock); |
| 2797 | |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2798 | return sret; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2799 | } |
| 2800 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2801 | static ssize_t |
| 2802 | tracing_entries_read(struct file *filp, char __user *ubuf, |
| 2803 | size_t cnt, loff_t *ppos) |
| 2804 | { |
| 2805 | struct trace_array *tr = filp->private_data; |
| 2806 | char buf[64]; |
| 2807 | int r; |
| 2808 | |
| 2809 | r = sprintf(buf, "%lu\n", tr->entries); |
| 2810 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
| 2811 | } |
| 2812 | |
| 2813 | static ssize_t |
| 2814 | tracing_entries_write(struct file *filp, const char __user *ubuf, |
| 2815 | size_t cnt, loff_t *ppos) |
| 2816 | { |
| 2817 | unsigned long val; |
| 2818 | char buf[64]; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2819 | int ret; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2820 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2821 | if (cnt >= sizeof(buf)) |
| 2822 | return -EINVAL; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2823 | |
| 2824 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2825 | return -EFAULT; |
| 2826 | |
| 2827 | buf[cnt] = 0; |
| 2828 | |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2829 | ret = strict_strtoul(buf, 10, &val); |
| 2830 | if (ret < 0) |
| 2831 | return ret; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2832 | |
| 2833 | /* must have at least 1 entry */ |
| 2834 | if (!val) |
| 2835 | return -EINVAL; |
| 2836 | |
| 2837 | mutex_lock(&trace_types_lock); |
| 2838 | |
Steven Rostedt | c76f069 | 2008-11-07 22:36:02 -0500 | [diff] [blame^] | 2839 | tracing_stop(); |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2840 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2841 | if (val != global_trace.entries) { |
| 2842 | ret = ring_buffer_resize(global_trace.buffer, val); |
| 2843 | if (ret < 0) { |
| 2844 | cnt = ret; |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 2845 | goto out; |
| 2846 | } |
| 2847 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2848 | ret = ring_buffer_resize(max_tr.buffer, val); |
| 2849 | if (ret < 0) { |
| 2850 | int r; |
| 2851 | cnt = ret; |
| 2852 | r = ring_buffer_resize(global_trace.buffer, |
| 2853 | global_trace.entries); |
| 2854 | if (r < 0) { |
| 2855 | /* AARGH! We are left with different |
| 2856 | * size max buffer!!!! */ |
| 2857 | WARN_ON(1); |
| 2858 | tracing_disabled = 1; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2859 | } |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2860 | goto out; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2861 | } |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 2862 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2863 | global_trace.entries = val; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2864 | } |
| 2865 | |
| 2866 | filp->f_pos += cnt; |
| 2867 | |
Steven Rostedt | 19384c0 | 2008-05-22 00:22:16 -0400 | [diff] [blame] | 2868 | /* If check pages failed, return ENOMEM */ |
| 2869 | if (tracing_disabled) |
| 2870 | cnt = -ENOMEM; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2871 | out: |
Steven Rostedt | c76f069 | 2008-11-07 22:36:02 -0500 | [diff] [blame^] | 2872 | tracing_start(); |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2873 | max_tr.entries = global_trace.entries; |
| 2874 | mutex_unlock(&trace_types_lock); |
| 2875 | |
| 2876 | return cnt; |
| 2877 | } |
| 2878 | |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 2879 | static int mark_printk(const char *fmt, ...) |
| 2880 | { |
| 2881 | int ret; |
| 2882 | va_list args; |
| 2883 | va_start(args, fmt); |
| 2884 | ret = trace_vprintk(0, fmt, args); |
| 2885 | va_end(args); |
| 2886 | return ret; |
| 2887 | } |
| 2888 | |
| 2889 | static ssize_t |
| 2890 | tracing_mark_write(struct file *filp, const char __user *ubuf, |
| 2891 | size_t cnt, loff_t *fpos) |
| 2892 | { |
| 2893 | char *buf; |
| 2894 | char *end; |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 2895 | |
Steven Rostedt | c76f069 | 2008-11-07 22:36:02 -0500 | [diff] [blame^] | 2896 | if (tracing_disabled) |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 2897 | return -EINVAL; |
| 2898 | |
| 2899 | if (cnt > TRACE_BUF_SIZE) |
| 2900 | cnt = TRACE_BUF_SIZE; |
| 2901 | |
| 2902 | buf = kmalloc(cnt + 1, GFP_KERNEL); |
| 2903 | if (buf == NULL) |
| 2904 | return -ENOMEM; |
| 2905 | |
| 2906 | if (copy_from_user(buf, ubuf, cnt)) { |
| 2907 | kfree(buf); |
| 2908 | return -EFAULT; |
| 2909 | } |
| 2910 | |
| 2911 | /* Cut from the first nil or newline. */ |
| 2912 | buf[cnt] = '\0'; |
| 2913 | end = strchr(buf, '\n'); |
| 2914 | if (end) |
| 2915 | *end = '\0'; |
| 2916 | |
| 2917 | cnt = mark_printk("%s\n", buf); |
| 2918 | kfree(buf); |
| 2919 | *fpos += cnt; |
| 2920 | |
| 2921 | return cnt; |
| 2922 | } |
| 2923 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2924 | static struct file_operations tracing_max_lat_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2925 | .open = tracing_open_generic, |
| 2926 | .read = tracing_max_lat_read, |
| 2927 | .write = tracing_max_lat_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2928 | }; |
| 2929 | |
| 2930 | static struct file_operations tracing_ctrl_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2931 | .open = tracing_open_generic, |
| 2932 | .read = tracing_ctrl_read, |
| 2933 | .write = tracing_ctrl_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2934 | }; |
| 2935 | |
| 2936 | static struct file_operations set_tracer_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2937 | .open = tracing_open_generic, |
| 2938 | .read = tracing_set_trace_read, |
| 2939 | .write = tracing_set_trace_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2940 | }; |
| 2941 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2942 | static struct file_operations tracing_pipe_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2943 | .open = tracing_open_pipe, |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2944 | .poll = tracing_poll_pipe, |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2945 | .read = tracing_read_pipe, |
| 2946 | .release = tracing_release_pipe, |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2947 | }; |
| 2948 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2949 | static struct file_operations tracing_entries_fops = { |
| 2950 | .open = tracing_open_generic, |
| 2951 | .read = tracing_entries_read, |
| 2952 | .write = tracing_entries_write, |
| 2953 | }; |
| 2954 | |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 2955 | static struct file_operations tracing_mark_fops = { |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 2956 | .open = tracing_open_generic, |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 2957 | .write = tracing_mark_write, |
| 2958 | }; |
| 2959 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2960 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 2961 | |
Steven Rostedt | b807c3d | 2008-10-30 16:08:33 -0400 | [diff] [blame] | 2962 | int __weak ftrace_arch_read_dyn_info(char *buf, int size) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2963 | { |
Steven Rostedt | b807c3d | 2008-10-30 16:08:33 -0400 | [diff] [blame] | 2964 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2965 | } |
| 2966 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2967 | static ssize_t |
Steven Rostedt | b807c3d | 2008-10-30 16:08:33 -0400 | [diff] [blame] | 2968 | tracing_read_dyn_info(struct file *filp, char __user *ubuf, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2969 | size_t cnt, loff_t *ppos) |
| 2970 | { |
Steven Rostedt | a26a2a2 | 2008-10-31 00:03:22 -0400 | [diff] [blame] | 2971 | static char ftrace_dyn_info_buffer[1024]; |
| 2972 | static DEFINE_MUTEX(dyn_info_mutex); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2973 | unsigned long *p = filp->private_data; |
Steven Rostedt | b807c3d | 2008-10-30 16:08:33 -0400 | [diff] [blame] | 2974 | char *buf = ftrace_dyn_info_buffer; |
Steven Rostedt | a26a2a2 | 2008-10-31 00:03:22 -0400 | [diff] [blame] | 2975 | int size = ARRAY_SIZE(ftrace_dyn_info_buffer); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2976 | int r; |
| 2977 | |
Steven Rostedt | b807c3d | 2008-10-30 16:08:33 -0400 | [diff] [blame] | 2978 | mutex_lock(&dyn_info_mutex); |
| 2979 | r = sprintf(buf, "%ld ", *p); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2980 | |
Steven Rostedt | a26a2a2 | 2008-10-31 00:03:22 -0400 | [diff] [blame] | 2981 | r += ftrace_arch_read_dyn_info(buf+r, (size-1)-r); |
Steven Rostedt | b807c3d | 2008-10-30 16:08:33 -0400 | [diff] [blame] | 2982 | buf[r++] = '\n'; |
| 2983 | |
| 2984 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
| 2985 | |
| 2986 | mutex_unlock(&dyn_info_mutex); |
| 2987 | |
| 2988 | return r; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2989 | } |
| 2990 | |
Steven Rostedt | b807c3d | 2008-10-30 16:08:33 -0400 | [diff] [blame] | 2991 | static struct file_operations tracing_dyn_info_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2992 | .open = tracing_open_generic, |
Steven Rostedt | b807c3d | 2008-10-30 16:08:33 -0400 | [diff] [blame] | 2993 | .read = tracing_read_dyn_info, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2994 | }; |
| 2995 | #endif |
| 2996 | |
| 2997 | static struct dentry *d_tracer; |
| 2998 | |
| 2999 | struct dentry *tracing_init_dentry(void) |
| 3000 | { |
| 3001 | static int once; |
| 3002 | |
| 3003 | if (d_tracer) |
| 3004 | return d_tracer; |
| 3005 | |
| 3006 | d_tracer = debugfs_create_dir("tracing", NULL); |
| 3007 | |
| 3008 | if (!d_tracer && !once) { |
| 3009 | once = 1; |
| 3010 | pr_warning("Could not create debugfs directory 'tracing'\n"); |
| 3011 | return NULL; |
| 3012 | } |
| 3013 | |
| 3014 | return d_tracer; |
| 3015 | } |
| 3016 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 3017 | #ifdef CONFIG_FTRACE_SELFTEST |
| 3018 | /* Let selftest have access to static functions in this file */ |
| 3019 | #include "trace_selftest.c" |
| 3020 | #endif |
| 3021 | |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame] | 3022 | static __init int tracer_init_debugfs(void) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3023 | { |
| 3024 | struct dentry *d_tracer; |
| 3025 | struct dentry *entry; |
| 3026 | |
| 3027 | d_tracer = tracing_init_dentry(); |
| 3028 | |
| 3029 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, |
| 3030 | &global_trace, &tracing_ctrl_fops); |
| 3031 | if (!entry) |
| 3032 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); |
| 3033 | |
| 3034 | entry = debugfs_create_file("iter_ctrl", 0644, d_tracer, |
| 3035 | NULL, &tracing_iter_fops); |
| 3036 | if (!entry) |
| 3037 | pr_warning("Could not create debugfs 'iter_ctrl' entry\n"); |
| 3038 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 3039 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
| 3040 | NULL, &tracing_cpumask_fops); |
| 3041 | if (!entry) |
| 3042 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); |
| 3043 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3044 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
| 3045 | &global_trace, &tracing_lt_fops); |
| 3046 | if (!entry) |
| 3047 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); |
| 3048 | |
| 3049 | entry = debugfs_create_file("trace", 0444, d_tracer, |
| 3050 | &global_trace, &tracing_fops); |
| 3051 | if (!entry) |
| 3052 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 3053 | |
| 3054 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, |
| 3055 | &global_trace, &show_traces_fops); |
| 3056 | if (!entry) |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 3057 | pr_warning("Could not create debugfs 'available_tracers' entry\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3058 | |
| 3059 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, |
| 3060 | &global_trace, &set_tracer_fops); |
| 3061 | if (!entry) |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 3062 | pr_warning("Could not create debugfs 'current_tracer' entry\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3063 | |
| 3064 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, |
| 3065 | &tracing_max_latency, |
| 3066 | &tracing_max_lat_fops); |
| 3067 | if (!entry) |
| 3068 | pr_warning("Could not create debugfs " |
| 3069 | "'tracing_max_latency' entry\n"); |
| 3070 | |
| 3071 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, |
| 3072 | &tracing_thresh, &tracing_max_lat_fops); |
| 3073 | if (!entry) |
| 3074 | pr_warning("Could not create debugfs " |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 3075 | "'tracing_thresh' entry\n"); |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3076 | entry = debugfs_create_file("README", 0644, d_tracer, |
| 3077 | NULL, &tracing_readme_fops); |
| 3078 | if (!entry) |
| 3079 | pr_warning("Could not create debugfs 'README' entry\n"); |
| 3080 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 3081 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
| 3082 | NULL, &tracing_pipe_fops); |
| 3083 | if (!entry) |
| 3084 | pr_warning("Could not create debugfs " |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 3085 | "'trace_pipe' entry\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3086 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3087 | entry = debugfs_create_file("trace_entries", 0644, d_tracer, |
| 3088 | &global_trace, &tracing_entries_fops); |
| 3089 | if (!entry) |
| 3090 | pr_warning("Could not create debugfs " |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 3091 | "'trace_entries' entry\n"); |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 3092 | |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 3093 | entry = debugfs_create_file("trace_marker", 0220, d_tracer, |
| 3094 | NULL, &tracing_mark_fops); |
| 3095 | if (!entry) |
| 3096 | pr_warning("Could not create debugfs " |
| 3097 | "'trace_marker' entry\n"); |
| 3098 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3099 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 3100 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, |
| 3101 | &ftrace_update_tot_cnt, |
Steven Rostedt | b807c3d | 2008-10-30 16:08:33 -0400 | [diff] [blame] | 3102 | &tracing_dyn_info_fops); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3103 | if (!entry) |
| 3104 | pr_warning("Could not create debugfs " |
| 3105 | "'dyn_ftrace_total_info' entry\n"); |
| 3106 | #endif |
Ingo Molnar | d618b3e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 3107 | #ifdef CONFIG_SYSPROF_TRACER |
| 3108 | init_tracer_sysprof_debugfs(d_tracer); |
| 3109 | #endif |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame] | 3110 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3111 | } |
| 3112 | |
Pekka Paalanen | 801fe40 | 2008-09-16 21:58:24 +0300 | [diff] [blame] | 3113 | int trace_vprintk(unsigned long ip, const char *fmt, va_list args) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3114 | { |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3115 | static DEFINE_SPINLOCK(trace_buf_lock); |
| 3116 | static char trace_buf[TRACE_BUF_SIZE]; |
Peter Zijlstra | f09ce57 | 2008-09-04 10:24:14 +0200 | [diff] [blame] | 3117 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3118 | struct ring_buffer_event *event; |
Peter Zijlstra | f09ce57 | 2008-09-04 10:24:14 +0200 | [diff] [blame] | 3119 | struct trace_array *tr = &global_trace; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3120 | struct trace_array_cpu *data; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 3121 | struct print_entry *entry; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3122 | unsigned long flags, irq_flags; |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 3123 | int cpu, len = 0, size, pc; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3124 | |
Steven Rostedt | c76f069 | 2008-11-07 22:36:02 -0500 | [diff] [blame^] | 3125 | if (tracing_disabled) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3126 | return 0; |
| 3127 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 3128 | pc = preempt_count(); |
| 3129 | preempt_disable_notrace(); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3130 | cpu = raw_smp_processor_id(); |
| 3131 | data = tr->data[cpu]; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3132 | |
Steven Rostedt | 3ea2e6d | 2008-10-04 02:01:00 -0400 | [diff] [blame] | 3133 | if (unlikely(atomic_read(&data->disabled))) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3134 | goto out; |
| 3135 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 3136 | spin_lock_irqsave(&trace_buf_lock, flags); |
Pekka Paalanen | 801fe40 | 2008-09-16 21:58:24 +0300 | [diff] [blame] | 3137 | len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3138 | |
| 3139 | len = min(len, TRACE_BUF_SIZE-1); |
| 3140 | trace_buf[len] = 0; |
| 3141 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 3142 | size = sizeof(*entry) + len + 1; |
| 3143 | event = ring_buffer_lock_reserve(tr->buffer, size, &irq_flags); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3144 | if (!event) |
| 3145 | goto out_unlock; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 3146 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 3147 | tracing_generic_entry_update(&entry->ent, flags, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 3148 | entry->ent.type = TRACE_PRINT; |
| 3149 | entry->ip = ip; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3150 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 3151 | memcpy(&entry->buf, trace_buf, len); |
| 3152 | entry->buf[len] = 0; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3153 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3154 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3155 | out_unlock: |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 3156 | spin_unlock_irqrestore(&trace_buf_lock, flags); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3157 | |
| 3158 | out: |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 3159 | preempt_enable_notrace(); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3160 | |
| 3161 | return len; |
| 3162 | } |
Pekka Paalanen | 801fe40 | 2008-09-16 21:58:24 +0300 | [diff] [blame] | 3163 | EXPORT_SYMBOL_GPL(trace_vprintk); |
| 3164 | |
| 3165 | int __ftrace_printk(unsigned long ip, const char *fmt, ...) |
| 3166 | { |
| 3167 | int ret; |
| 3168 | va_list ap; |
| 3169 | |
| 3170 | if (!(trace_flags & TRACE_ITER_PRINTK)) |
| 3171 | return 0; |
| 3172 | |
| 3173 | va_start(ap, fmt); |
| 3174 | ret = trace_vprintk(ip, fmt, ap); |
| 3175 | va_end(ap); |
| 3176 | return ret; |
| 3177 | } |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3178 | EXPORT_SYMBOL_GPL(__ftrace_printk); |
| 3179 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3180 | static int trace_panic_handler(struct notifier_block *this, |
| 3181 | unsigned long event, void *unused) |
| 3182 | { |
Steven Rostedt | 944ac42 | 2008-10-23 19:26:08 -0400 | [diff] [blame] | 3183 | if (ftrace_dump_on_oops) |
| 3184 | ftrace_dump(); |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3185 | return NOTIFY_OK; |
| 3186 | } |
| 3187 | |
| 3188 | static struct notifier_block trace_panic_notifier = { |
| 3189 | .notifier_call = trace_panic_handler, |
| 3190 | .next = NULL, |
| 3191 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ |
| 3192 | }; |
| 3193 | |
| 3194 | static int trace_die_handler(struct notifier_block *self, |
| 3195 | unsigned long val, |
| 3196 | void *data) |
| 3197 | { |
| 3198 | switch (val) { |
| 3199 | case DIE_OOPS: |
Steven Rostedt | 944ac42 | 2008-10-23 19:26:08 -0400 | [diff] [blame] | 3200 | if (ftrace_dump_on_oops) |
| 3201 | ftrace_dump(); |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3202 | break; |
| 3203 | default: |
| 3204 | break; |
| 3205 | } |
| 3206 | return NOTIFY_OK; |
| 3207 | } |
| 3208 | |
| 3209 | static struct notifier_block trace_die_notifier = { |
| 3210 | .notifier_call = trace_die_handler, |
| 3211 | .priority = 200 |
| 3212 | }; |
| 3213 | |
| 3214 | /* |
| 3215 | * printk is set to max of 1024, we really don't need it that big. |
| 3216 | * Nothing should be printing 1000 characters anyway. |
| 3217 | */ |
| 3218 | #define TRACE_MAX_PRINT 1000 |
| 3219 | |
| 3220 | /* |
| 3221 | * Define here KERN_TRACE so that we have one place to modify |
| 3222 | * it if we decide to change what log level the ftrace dump |
| 3223 | * should be at. |
| 3224 | */ |
| 3225 | #define KERN_TRACE KERN_INFO |
| 3226 | |
| 3227 | static void |
| 3228 | trace_printk_seq(struct trace_seq *s) |
| 3229 | { |
| 3230 | /* Probably should print a warning here. */ |
| 3231 | if (s->len >= 1000) |
| 3232 | s->len = 1000; |
| 3233 | |
| 3234 | /* should be zero ended, but we are paranoid. */ |
| 3235 | s->buffer[s->len] = 0; |
| 3236 | |
| 3237 | printk(KERN_TRACE "%s", s->buffer); |
| 3238 | |
| 3239 | trace_seq_reset(s); |
| 3240 | } |
| 3241 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3242 | void ftrace_dump(void) |
| 3243 | { |
| 3244 | static DEFINE_SPINLOCK(ftrace_dump_lock); |
| 3245 | /* use static because iter can be a bit big for the stack */ |
| 3246 | static struct trace_iterator iter; |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3247 | static cpumask_t mask; |
| 3248 | static int dump_ran; |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 3249 | unsigned long flags; |
| 3250 | int cnt = 0, cpu; |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3251 | |
| 3252 | /* only one dump */ |
| 3253 | spin_lock_irqsave(&ftrace_dump_lock, flags); |
| 3254 | if (dump_ran) |
| 3255 | goto out; |
| 3256 | |
| 3257 | dump_ran = 1; |
| 3258 | |
| 3259 | /* No turning back! */ |
Steven Rostedt | 81adbdc | 2008-10-23 09:33:02 -0400 | [diff] [blame] | 3260 | ftrace_kill(); |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3261 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 3262 | for_each_tracing_cpu(cpu) { |
| 3263 | atomic_inc(&global_trace.data[cpu]->disabled); |
| 3264 | } |
| 3265 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3266 | printk(KERN_TRACE "Dumping ftrace buffer:\n"); |
| 3267 | |
| 3268 | iter.tr = &global_trace; |
| 3269 | iter.trace = current_trace; |
| 3270 | |
| 3271 | /* |
| 3272 | * We need to stop all tracing on all CPUS to read the |
| 3273 | * the next buffer. This is a bit expensive, but is |
| 3274 | * not done often. We fill all what we can read, |
| 3275 | * and then release the locks again. |
| 3276 | */ |
| 3277 | |
| 3278 | cpus_clear(mask); |
| 3279 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3280 | while (!trace_empty(&iter)) { |
| 3281 | |
| 3282 | if (!cnt) |
| 3283 | printk(KERN_TRACE "---------------------------------\n"); |
| 3284 | |
| 3285 | cnt++; |
| 3286 | |
| 3287 | /* reset all but tr, trace, and overruns */ |
| 3288 | memset(&iter.seq, 0, |
| 3289 | sizeof(struct trace_iterator) - |
| 3290 | offsetof(struct trace_iterator, seq)); |
| 3291 | iter.iter_flags |= TRACE_FILE_LAT_FMT; |
| 3292 | iter.pos = -1; |
| 3293 | |
| 3294 | if (find_next_entry_inc(&iter) != NULL) { |
| 3295 | print_trace_line(&iter); |
| 3296 | trace_consume(&iter); |
| 3297 | } |
| 3298 | |
| 3299 | trace_printk_seq(&iter.seq); |
| 3300 | } |
| 3301 | |
| 3302 | if (!cnt) |
| 3303 | printk(KERN_TRACE " (ftrace buffer empty)\n"); |
| 3304 | else |
| 3305 | printk(KERN_TRACE "---------------------------------\n"); |
| 3306 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3307 | out: |
| 3308 | spin_unlock_irqrestore(&ftrace_dump_lock, flags); |
| 3309 | } |
| 3310 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3311 | __init static int tracer_alloc_buffers(void) |
| 3312 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3313 | struct trace_array_cpu *data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3314 | int i; |
| 3315 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 3316 | /* TODO: make the number of buffers hot pluggable with CPUS */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 3317 | tracing_buffer_mask = cpu_possible_map; |
| 3318 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3319 | global_trace.buffer = ring_buffer_alloc(trace_buf_size, |
| 3320 | TRACE_BUFFER_FLAGS); |
| 3321 | if (!global_trace.buffer) { |
| 3322 | printk(KERN_ERR "tracer: failed to allocate ring buffer!\n"); |
| 3323 | WARN_ON(1); |
| 3324 | return 0; |
| 3325 | } |
| 3326 | global_trace.entries = ring_buffer_size(global_trace.buffer); |
| 3327 | |
| 3328 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 3329 | max_tr.buffer = ring_buffer_alloc(trace_buf_size, |
| 3330 | TRACE_BUFFER_FLAGS); |
| 3331 | if (!max_tr.buffer) { |
| 3332 | printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n"); |
| 3333 | WARN_ON(1); |
| 3334 | ring_buffer_free(global_trace.buffer); |
| 3335 | return 0; |
| 3336 | } |
| 3337 | max_tr.entries = ring_buffer_size(max_tr.buffer); |
| 3338 | WARN_ON(max_tr.entries != global_trace.entries); |
| 3339 | #endif |
| 3340 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3341 | /* Allocate the first page for all buffers */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 3342 | for_each_tracing_cpu(i) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3343 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3344 | max_tr.data[i] = &per_cpu(max_data, i); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3345 | } |
| 3346 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3347 | trace_init_cmdlines(); |
| 3348 | |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 3349 | register_tracer(&nop_trace); |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame] | 3350 | #ifdef CONFIG_BOOT_TRACER |
| 3351 | register_tracer(&boot_tracer); |
| 3352 | current_trace = &boot_tracer; |
| 3353 | current_trace->init(&global_trace); |
| 3354 | #else |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 3355 | current_trace = &nop_trace; |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame] | 3356 | #endif |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3357 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 3358 | /* All seems OK, enable tracing */ |
| 3359 | tracing_disabled = 0; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3360 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3361 | atomic_notifier_chain_register(&panic_notifier_list, |
| 3362 | &trace_panic_notifier); |
| 3363 | |
| 3364 | register_die_notifier(&trace_die_notifier); |
| 3365 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3366 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3367 | } |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame] | 3368 | early_initcall(tracer_alloc_buffers); |
| 3369 | fs_initcall(tracer_init_debugfs); |