Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * arch/s390/kernel/smp.c |
| 3 | * |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 4 | * Copyright IBM Corp. 1999,2007 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 6 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
| 7 | * Heiko Carstens (heiko.carstens@de.ibm.com) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 9 | * based on other smp stuff by |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * (c) 1995 Alan Cox, CymruNET Ltd <alan@cymru.net> |
| 11 | * (c) 1998 Ingo Molnar |
| 12 | * |
| 13 | * We work with logical cpu numbering everywhere we can. The only |
| 14 | * functions using the real cpu address (got from STAP) are the sigp |
| 15 | * functions. For all other functions we use the identity mapping. |
| 16 | * That means that cpu_number_map[i] == i for every cpu. cpu_number_map is |
| 17 | * used e.g. to find the idle task belonging to a logical cpu. Every array |
| 18 | * in the kernel is sorted by the logical cpu number and not by the physical |
| 19 | * one which is causing all the confusion with __cpu_logical_map and |
| 20 | * cpu_number_map in other architectures. |
| 21 | */ |
| 22 | |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/mm.h> |
Alexey Dobriyan | 4e950f6 | 2007-07-30 02:36:13 +0400 | [diff] [blame] | 26 | #include <linux/err.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <linux/spinlock.h> |
| 28 | #include <linux/kernel_stat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/delay.h> |
| 30 | #include <linux/cache.h> |
| 31 | #include <linux/interrupt.h> |
| 32 | #include <linux/cpu.h> |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 33 | #include <linux/timex.h> |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 34 | #include <linux/bootmem.h> |
Michael Holzheu | 46b05d2 | 2007-02-21 10:55:21 +0100 | [diff] [blame] | 35 | #include <asm/ipl.h> |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 36 | #include <asm/setup.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include <asm/sigp.h> |
| 38 | #include <asm/pgalloc.h> |
| 39 | #include <asm/irq.h> |
| 40 | #include <asm/s390_ext.h> |
| 41 | #include <asm/cpcmd.h> |
| 42 | #include <asm/tlbflush.h> |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 43 | #include <asm/timer.h> |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 44 | #include <asm/lowcore.h> |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 45 | #include <asm/sclp.h> |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 46 | #include <asm/cpu.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | /* |
| 49 | * An array with a pointer the lowcore of every CPU. |
| 50 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | struct _lowcore *lowcore_ptr[NR_CPUS]; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 52 | EXPORT_SYMBOL(lowcore_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
Heiko Carstens | 255acee | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 54 | cpumask_t cpu_online_map = CPU_MASK_NONE; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 55 | EXPORT_SYMBOL(cpu_online_map); |
| 56 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame^] | 57 | cpumask_t cpu_possible_map = CPU_MASK_ALL; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 58 | EXPORT_SYMBOL(cpu_possible_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
| 60 | static struct task_struct *current_set[NR_CPUS]; |
| 61 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 62 | static u8 smp_cpu_type; |
| 63 | static int smp_use_sigp_detection; |
| 64 | |
| 65 | enum s390_cpu_state { |
| 66 | CPU_STATE_STANDBY, |
| 67 | CPU_STATE_CONFIGURED, |
| 68 | }; |
| 69 | |
| 70 | #ifdef CONFIG_HOTPLUG_CPU |
| 71 | static DEFINE_MUTEX(smp_cpu_state_mutex); |
| 72 | #endif |
| 73 | static int smp_cpu_state[NR_CPUS]; |
| 74 | |
| 75 | static DEFINE_PER_CPU(struct cpu, cpu_devices); |
| 76 | DEFINE_PER_CPU(struct s390_idle_data, s390_idle); |
| 77 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | static void smp_ext_bitcall(int, ec_bit_sig); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
| 80 | /* |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 81 | * Structure and data for __smp_call_function_map(). This is designed to |
| 82 | * minimise static memory requirements. It also looks cleaner. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | */ |
| 84 | static DEFINE_SPINLOCK(call_lock); |
| 85 | |
| 86 | struct call_data_struct { |
| 87 | void (*func) (void *info); |
| 88 | void *info; |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 89 | cpumask_t started; |
| 90 | cpumask_t finished; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | int wait; |
| 92 | }; |
| 93 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 94 | static struct call_data_struct *call_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
| 96 | /* |
| 97 | * 'Call function' interrupt callback |
| 98 | */ |
| 99 | static void do_call_function(void) |
| 100 | { |
| 101 | void (*func) (void *info) = call_data->func; |
| 102 | void *info = call_data->info; |
| 103 | int wait = call_data->wait; |
| 104 | |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 105 | cpu_set(smp_processor_id(), call_data->started); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | (*func)(info); |
| 107 | if (wait) |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 108 | cpu_set(smp_processor_id(), call_data->finished);; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | } |
| 110 | |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 111 | static void __smp_call_function_map(void (*func) (void *info), void *info, |
| 112 | int nonatomic, int wait, cpumask_t map) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | { |
| 114 | struct call_data_struct data; |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 115 | int cpu, local = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 117 | /* |
Heiko Carstens | 2586416 | 2007-03-05 23:35:41 +0100 | [diff] [blame] | 118 | * Can deadlock when interrupts are disabled or if in wrong context. |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 119 | */ |
Heiko Carstens | 2586416 | 2007-03-05 23:35:41 +0100 | [diff] [blame] | 120 | WARN_ON(irqs_disabled() || in_irq()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 122 | /* |
| 123 | * Check for local function call. We have to have the same call order |
| 124 | * as in on_each_cpu() because of machine_restart_smp(). |
| 125 | */ |
| 126 | if (cpu_isset(smp_processor_id(), map)) { |
| 127 | local = 1; |
| 128 | cpu_clear(smp_processor_id(), map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | } |
| 130 | |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 131 | cpus_and(map, map, cpu_online_map); |
| 132 | if (cpus_empty(map)) |
| 133 | goto out; |
| 134 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | data.func = func; |
| 136 | data.info = info; |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 137 | data.started = CPU_MASK_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | data.wait = wait; |
| 139 | if (wait) |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 140 | data.finished = CPU_MASK_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | |
Heiko Carstens | 8da1aec | 2007-07-27 12:29:09 +0200 | [diff] [blame] | 142 | spin_lock(&call_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | call_data = &data; |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 144 | |
| 145 | for_each_cpu_mask(cpu, map) |
| 146 | smp_ext_bitcall(cpu, ec_call_function); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
| 148 | /* Wait for response */ |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 149 | while (!cpus_equal(map, data.started)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | cpu_relax(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | if (wait) |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 152 | while (!cpus_equal(map, data.finished)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | cpu_relax(); |
Heiko Carstens | 8da1aec | 2007-07-27 12:29:09 +0200 | [diff] [blame] | 154 | spin_unlock(&call_lock); |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 155 | out: |
Heiko Carstens | 8da1aec | 2007-07-27 12:29:09 +0200 | [diff] [blame] | 156 | if (local) { |
| 157 | local_irq_disable(); |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 158 | func(info); |
Heiko Carstens | 8da1aec | 2007-07-27 12:29:09 +0200 | [diff] [blame] | 159 | local_irq_enable(); |
| 160 | } |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 161 | } |
| 162 | |
| 163 | /* |
| 164 | * smp_call_function: |
| 165 | * @func: the function to run; this must be fast and non-blocking |
| 166 | * @info: an arbitrary pointer to pass to the function |
| 167 | * @nonatomic: unused |
| 168 | * @wait: if true, wait (atomically) until function has completed on other CPUs |
| 169 | * |
| 170 | * Run a function on all other CPUs. |
| 171 | * |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 172 | * You must not call this function with disabled interrupts, from a |
| 173 | * hardware interrupt handler or from a bottom half. |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 174 | */ |
| 175 | int smp_call_function(void (*func) (void *info), void *info, int nonatomic, |
| 176 | int wait) |
| 177 | { |
| 178 | cpumask_t map; |
| 179 | |
Heiko Carstens | 2586416 | 2007-03-05 23:35:41 +0100 | [diff] [blame] | 180 | preempt_disable(); |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 181 | map = cpu_online_map; |
| 182 | cpu_clear(smp_processor_id(), map); |
| 183 | __smp_call_function_map(func, info, nonatomic, wait, map); |
Heiko Carstens | 2586416 | 2007-03-05 23:35:41 +0100 | [diff] [blame] | 184 | preempt_enable(); |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 185 | return 0; |
| 186 | } |
| 187 | EXPORT_SYMBOL(smp_call_function); |
| 188 | |
| 189 | /* |
Heiko Carstens | 3bb447f | 2007-07-27 12:29:08 +0200 | [diff] [blame] | 190 | * smp_call_function_single: |
| 191 | * @cpu: the CPU where func should run |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 192 | * @func: the function to run; this must be fast and non-blocking |
| 193 | * @info: an arbitrary pointer to pass to the function |
| 194 | * @nonatomic: unused |
| 195 | * @wait: if true, wait (atomically) until function has completed on other CPUs |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 196 | * |
| 197 | * Run a function on one processor. |
| 198 | * |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 199 | * You must not call this function with disabled interrupts, from a |
| 200 | * hardware interrupt handler or from a bottom half. |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 201 | */ |
Heiko Carstens | 3bb447f | 2007-07-27 12:29:08 +0200 | [diff] [blame] | 202 | int smp_call_function_single(int cpu, void (*func) (void *info), void *info, |
| 203 | int nonatomic, int wait) |
Jan Glauber | 63db6e8 | 2007-02-21 10:55:06 +0100 | [diff] [blame] | 204 | { |
Heiko Carstens | 2586416 | 2007-03-05 23:35:41 +0100 | [diff] [blame] | 205 | preempt_disable(); |
Heiko Carstens | 3bb447f | 2007-07-27 12:29:08 +0200 | [diff] [blame] | 206 | __smp_call_function_map(func, info, nonatomic, wait, |
| 207 | cpumask_of_cpu(cpu)); |
Heiko Carstens | 2586416 | 2007-03-05 23:35:41 +0100 | [diff] [blame] | 208 | preempt_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | return 0; |
| 210 | } |
Heiko Carstens | 3bb447f | 2007-07-27 12:29:08 +0200 | [diff] [blame] | 211 | EXPORT_SYMBOL(smp_call_function_single); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
Heiko Carstens | 677d762 | 2007-11-20 11:13:37 +0100 | [diff] [blame] | 213 | void smp_send_stop(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 215 | int cpu, rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | |
Heiko Carstens | 677d762 | 2007-11-20 11:13:37 +0100 | [diff] [blame] | 217 | /* Disable all interrupts/machine checks */ |
| 218 | __load_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK); |
| 219 | |
| 220 | /* write magic number to zero page (absolute 0) */ |
| 221 | lowcore_ptr[smp_processor_id()]->panic_magic = __PANIC_MAGIC; |
| 222 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 223 | /* stop all processors */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | for_each_online_cpu(cpu) { |
| 225 | if (cpu == smp_processor_id()) |
| 226 | continue; |
| 227 | do { |
| 228 | rc = signal_processor(cpu, sigp_stop); |
| 229 | } while (rc == sigp_busy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 231 | while (!smp_cpu_not_running(cpu)) |
Heiko Carstens | c6b5b84 | 2006-12-04 15:40:33 +0100 | [diff] [blame] | 232 | cpu_relax(); |
| 233 | } |
| 234 | } |
| 235 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | * Reboot, halt and power_off routines for SMP. |
| 238 | */ |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 239 | void machine_restart_smp(char *__unused) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | { |
Heiko Carstens | c6b5b84 | 2006-12-04 15:40:33 +0100 | [diff] [blame] | 241 | smp_send_stop(); |
| 242 | do_reipl(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | } |
| 244 | |
| 245 | void machine_halt_smp(void) |
| 246 | { |
Heiko Carstens | c6b5b84 | 2006-12-04 15:40:33 +0100 | [diff] [blame] | 247 | smp_send_stop(); |
| 248 | if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0) |
| 249 | __cpcmd(vmhalt_cmd, NULL, 0, NULL); |
| 250 | signal_processor(smp_processor_id(), sigp_stop_and_store_status); |
| 251 | for (;;); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | } |
| 253 | |
| 254 | void machine_power_off_smp(void) |
| 255 | { |
Heiko Carstens | c6b5b84 | 2006-12-04 15:40:33 +0100 | [diff] [blame] | 256 | smp_send_stop(); |
| 257 | if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0) |
| 258 | __cpcmd(vmpoff_cmd, NULL, 0, NULL); |
| 259 | signal_processor(smp_processor_id(), sigp_stop_and_store_status); |
| 260 | for (;;); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | } |
| 262 | |
| 263 | /* |
| 264 | * This is the main routine where commands issued by other |
| 265 | * cpus are handled. |
| 266 | */ |
| 267 | |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 268 | static void do_ext_call_interrupt(__u16 code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 270 | unsigned long bits; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 272 | /* |
| 273 | * handle bit signal external calls |
| 274 | * |
| 275 | * For the ec_schedule signal we have to do nothing. All the work |
| 276 | * is done automatically when we return from the interrupt. |
| 277 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | bits = xchg(&S390_lowcore.ext_call_fast, 0); |
| 279 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 280 | if (test_bit(ec_call_function, &bits)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | do_call_function(); |
| 282 | } |
| 283 | |
| 284 | /* |
| 285 | * Send an external call sigp to another cpu and return without waiting |
| 286 | * for its completion. |
| 287 | */ |
| 288 | static void smp_ext_bitcall(int cpu, ec_bit_sig sig) |
| 289 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 290 | /* |
| 291 | * Set signaling bit in lowcore of target cpu and kick it |
| 292 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast); |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 294 | while (signal_processor(cpu, sigp_emergency_signal) == sigp_busy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | udelay(10); |
| 296 | } |
| 297 | |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 298 | #ifndef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | /* |
| 300 | * this function sends a 'purge tlb' signal to another CPU. |
| 301 | */ |
| 302 | void smp_ptlb_callback(void *info) |
| 303 | { |
Martin Schwidefsky | ba8a922 | 2007-10-22 12:52:44 +0200 | [diff] [blame] | 304 | __tlb_flush_local(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | } |
| 306 | |
| 307 | void smp_ptlb_all(void) |
| 308 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 309 | on_each_cpu(smp_ptlb_callback, NULL, 0, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | } |
| 311 | EXPORT_SYMBOL(smp_ptlb_all); |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 312 | #endif /* ! CONFIG_64BIT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | |
| 314 | /* |
| 315 | * this function sends a 'reschedule' IPI to another CPU. |
| 316 | * it goes straight through and wastes no time serializing |
| 317 | * anything. Worst case is that we lose a reschedule ... |
| 318 | */ |
| 319 | void smp_send_reschedule(int cpu) |
| 320 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 321 | smp_ext_bitcall(cpu, ec_schedule); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | } |
| 323 | |
| 324 | /* |
| 325 | * parameter area for the set/clear control bit callbacks |
| 326 | */ |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 327 | struct ec_creg_mask_parms { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | unsigned long orvals[16]; |
| 329 | unsigned long andvals[16]; |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 330 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | |
| 332 | /* |
| 333 | * callback for setting/clearing control bits |
| 334 | */ |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 335 | static void smp_ctl_bit_callback(void *info) |
| 336 | { |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 337 | struct ec_creg_mask_parms *pp = info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | unsigned long cregs[16]; |
| 339 | int i; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 340 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 341 | __ctl_store(cregs, 0, 15); |
| 342 | for (i = 0; i <= 15; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | cregs[i] = (cregs[i] & pp->andvals[i]) | pp->orvals[i]; |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 344 | __ctl_load(cregs, 0, 15); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | } |
| 346 | |
| 347 | /* |
| 348 | * Set a bit in a control register of all cpus |
| 349 | */ |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 350 | void smp_ctl_set_bit(int cr, int bit) |
| 351 | { |
| 352 | struct ec_creg_mask_parms parms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 354 | memset(&parms.orvals, 0, sizeof(parms.orvals)); |
| 355 | memset(&parms.andvals, 0xff, sizeof(parms.andvals)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | parms.orvals[cr] = 1 << bit; |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 357 | on_each_cpu(smp_ctl_bit_callback, &parms, 0, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | } |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 359 | EXPORT_SYMBOL(smp_ctl_set_bit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | |
| 361 | /* |
| 362 | * Clear a bit in a control register of all cpus |
| 363 | */ |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 364 | void smp_ctl_clear_bit(int cr, int bit) |
| 365 | { |
| 366 | struct ec_creg_mask_parms parms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 368 | memset(&parms.orvals, 0, sizeof(parms.orvals)); |
| 369 | memset(&parms.andvals, 0xff, sizeof(parms.andvals)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | parms.andvals[cr] = ~(1L << bit); |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 371 | on_each_cpu(smp_ctl_bit_callback, &parms, 0, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | } |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 373 | EXPORT_SYMBOL(smp_ctl_clear_bit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 375 | /* |
| 376 | * In early ipl state a temp. logically cpu number is needed, so the sigp |
| 377 | * functions can be used to sense other cpus. Since NR_CPUS is >= 2 on |
| 378 | * CONFIG_SMP and the ipl cpu is logical cpu 0, it must be 1. |
| 379 | */ |
| 380 | #define CPU_INIT_NO 1 |
| 381 | |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 382 | #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE) |
| 383 | |
| 384 | /* |
| 385 | * zfcpdump_prefix_array holds prefix registers for the following scenario: |
| 386 | * 64 bit zfcpdump kernel and 31 bit kernel which is to be dumped. We have to |
| 387 | * save its prefix registers, since they get lost, when switching from 31 bit |
| 388 | * to 64 bit. |
| 389 | */ |
| 390 | unsigned int zfcpdump_prefix_array[NR_CPUS + 1] \ |
| 391 | __attribute__((__section__(".data"))); |
| 392 | |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 393 | static void __init smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 394 | { |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 395 | if (ipl_info.type != IPL_TYPE_FCP_DUMP) |
| 396 | return; |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 397 | if (cpu >= NR_CPUS) { |
| 398 | printk(KERN_WARNING "Registers for cpu %i not saved since dump " |
| 399 | "kernel was compiled with NR_CPUS=%i\n", cpu, NR_CPUS); |
| 400 | return; |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 401 | } |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame^] | 402 | zfcpdump_save_areas[cpu] = kmalloc(sizeof(union save_area), GFP_KERNEL); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 403 | __cpu_logical_map[CPU_INIT_NO] = (__u16) phy_cpu; |
| 404 | while (signal_processor(CPU_INIT_NO, sigp_stop_and_store_status) == |
| 405 | sigp_busy) |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 406 | cpu_relax(); |
| 407 | memcpy(zfcpdump_save_areas[cpu], |
| 408 | (void *)(unsigned long) store_prefix() + SAVE_AREA_BASE, |
| 409 | SAVE_AREA_SIZE); |
| 410 | #ifdef CONFIG_64BIT |
| 411 | /* copy original prefix register */ |
| 412 | zfcpdump_save_areas[cpu]->s390x.pref_reg = zfcpdump_prefix_array[cpu]; |
| 413 | #endif |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 414 | } |
| 415 | |
| 416 | union save_area *zfcpdump_save_areas[NR_CPUS + 1]; |
| 417 | EXPORT_SYMBOL_GPL(zfcpdump_save_areas); |
| 418 | |
| 419 | #else |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 420 | |
| 421 | static inline void smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) { } |
| 422 | |
| 423 | #endif /* CONFIG_ZFCPDUMP || CONFIG_ZFCPDUMP_MODULE */ |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 424 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 425 | static int cpu_stopped(int cpu) |
| 426 | { |
| 427 | __u32 status; |
| 428 | |
| 429 | /* Check for stopped state */ |
| 430 | if (signal_processor_ps(&status, 0, cpu, sigp_sense) == |
| 431 | sigp_status_stored) { |
| 432 | if (status & 0x40) |
| 433 | return 1; |
| 434 | } |
| 435 | return 0; |
| 436 | } |
| 437 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 438 | static int cpu_known(int cpu_id) |
| 439 | { |
| 440 | int cpu; |
| 441 | |
| 442 | for_each_present_cpu(cpu) { |
| 443 | if (__cpu_logical_map[cpu] == cpu_id) |
| 444 | return 1; |
| 445 | } |
| 446 | return 0; |
| 447 | } |
| 448 | |
| 449 | static int smp_rescan_cpus_sigp(cpumask_t avail) |
| 450 | { |
| 451 | int cpu_id, logical_cpu; |
| 452 | |
| 453 | logical_cpu = first_cpu(avail); |
| 454 | if (logical_cpu == NR_CPUS) |
| 455 | return 0; |
| 456 | for (cpu_id = 0; cpu_id <= 65535; cpu_id++) { |
| 457 | if (cpu_known(cpu_id)) |
| 458 | continue; |
| 459 | __cpu_logical_map[logical_cpu] = cpu_id; |
| 460 | if (!cpu_stopped(logical_cpu)) |
| 461 | continue; |
| 462 | cpu_set(logical_cpu, cpu_present_map); |
| 463 | smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED; |
| 464 | logical_cpu = next_cpu(logical_cpu, avail); |
| 465 | if (logical_cpu == NR_CPUS) |
| 466 | break; |
| 467 | } |
| 468 | return 0; |
| 469 | } |
| 470 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame^] | 471 | static int smp_rescan_cpus_sclp(cpumask_t avail) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 472 | { |
| 473 | struct sclp_cpu_info *info; |
| 474 | int cpu_id, logical_cpu, cpu; |
| 475 | int rc; |
| 476 | |
| 477 | logical_cpu = first_cpu(avail); |
| 478 | if (logical_cpu == NR_CPUS) |
| 479 | return 0; |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame^] | 480 | info = kmalloc(sizeof(*info), GFP_KERNEL); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 481 | if (!info) |
| 482 | return -ENOMEM; |
| 483 | rc = sclp_get_cpu_info(info); |
| 484 | if (rc) |
| 485 | goto out; |
| 486 | for (cpu = 0; cpu < info->combined; cpu++) { |
| 487 | if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type) |
| 488 | continue; |
| 489 | cpu_id = info->cpu[cpu].address; |
| 490 | if (cpu_known(cpu_id)) |
| 491 | continue; |
| 492 | __cpu_logical_map[logical_cpu] = cpu_id; |
| 493 | cpu_set(logical_cpu, cpu_present_map); |
| 494 | if (cpu >= info->configured) |
| 495 | smp_cpu_state[logical_cpu] = CPU_STATE_STANDBY; |
| 496 | else |
| 497 | smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED; |
| 498 | logical_cpu = next_cpu(logical_cpu, avail); |
| 499 | if (logical_cpu == NR_CPUS) |
| 500 | break; |
| 501 | } |
| 502 | out: |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame^] | 503 | kfree(info); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 504 | return rc; |
| 505 | } |
| 506 | |
| 507 | static int smp_rescan_cpus(void) |
| 508 | { |
| 509 | cpumask_t avail; |
| 510 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame^] | 511 | cpus_xor(avail, cpu_possible_map, cpu_present_map); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 512 | if (smp_use_sigp_detection) |
| 513 | return smp_rescan_cpus_sigp(avail); |
| 514 | else |
| 515 | return smp_rescan_cpus_sclp(avail); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | } |
| 517 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame^] | 518 | static void __init smp_detect_cpus(void) |
| 519 | { |
| 520 | unsigned int cpu, c_cpus, s_cpus; |
| 521 | struct sclp_cpu_info *info; |
| 522 | u16 boot_cpu_addr, cpu_addr; |
| 523 | |
| 524 | c_cpus = 1; |
| 525 | s_cpus = 0; |
| 526 | boot_cpu_addr = S390_lowcore.cpu_data.cpu_addr; |
| 527 | info = kmalloc(sizeof(*info), GFP_KERNEL); |
| 528 | if (!info) |
| 529 | panic("smp_detect_cpus failed to allocate memory\n"); |
| 530 | /* Use sigp detection algorithm if sclp doesn't work. */ |
| 531 | if (sclp_get_cpu_info(info)) { |
| 532 | smp_use_sigp_detection = 1; |
| 533 | for (cpu = 0; cpu <= 65535; cpu++) { |
| 534 | if (cpu == boot_cpu_addr) |
| 535 | continue; |
| 536 | __cpu_logical_map[CPU_INIT_NO] = cpu; |
| 537 | if (!cpu_stopped(CPU_INIT_NO)) |
| 538 | continue; |
| 539 | smp_get_save_area(c_cpus, cpu); |
| 540 | c_cpus++; |
| 541 | } |
| 542 | goto out; |
| 543 | } |
| 544 | |
| 545 | if (info->has_cpu_type) { |
| 546 | for (cpu = 0; cpu < info->combined; cpu++) { |
| 547 | if (info->cpu[cpu].address == boot_cpu_addr) { |
| 548 | smp_cpu_type = info->cpu[cpu].type; |
| 549 | break; |
| 550 | } |
| 551 | } |
| 552 | } |
| 553 | |
| 554 | for (cpu = 0; cpu < info->combined; cpu++) { |
| 555 | if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type) |
| 556 | continue; |
| 557 | cpu_addr = info->cpu[cpu].address; |
| 558 | if (cpu_addr == boot_cpu_addr) |
| 559 | continue; |
| 560 | __cpu_logical_map[CPU_INIT_NO] = cpu_addr; |
| 561 | if (!cpu_stopped(CPU_INIT_NO)) { |
| 562 | s_cpus++; |
| 563 | continue; |
| 564 | } |
| 565 | smp_get_save_area(c_cpus, cpu_addr); |
| 566 | c_cpus++; |
| 567 | } |
| 568 | out: |
| 569 | kfree(info); |
| 570 | printk(KERN_INFO "CPUs: %d configured, %d standby\n", c_cpus, s_cpus); |
| 571 | lock_cpu_hotplug(); |
| 572 | smp_rescan_cpus(); |
| 573 | unlock_cpu_hotplug(); |
| 574 | } |
| 575 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | /* |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 577 | * Activate a secondary processor. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | */ |
Heiko Carstens | ea1f4ee | 2007-05-31 17:38:05 +0200 | [diff] [blame] | 579 | int __cpuinit start_secondary(void *cpuvoid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 581 | /* Setup the cpu */ |
| 582 | cpu_init(); |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 583 | preempt_disable(); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 584 | /* Enable TOD clock interrupts on the secondary cpu. */ |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 585 | init_cpu_timer(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | #ifdef CONFIG_VIRT_TIMER |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 587 | /* Enable cpu timer interrupts on the secondary cpu. */ |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 588 | init_cpu_vtimer(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | /* Enable pfault pseudo page faults on this cpu. */ |
Heiko Carstens | 29b08d2 | 2006-12-04 15:40:40 +0100 | [diff] [blame] | 591 | pfault_init(); |
| 592 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | /* Mark this cpu as online */ |
| 594 | cpu_set(smp_processor_id(), cpu_online_map); |
| 595 | /* Switch on interrupts */ |
| 596 | local_irq_enable(); |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 597 | /* Print info about this processor */ |
| 598 | print_cpu_info(&S390_lowcore.cpu_data); |
| 599 | /* cpu_idle will call schedule for us */ |
| 600 | cpu_idle(); |
| 601 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | } |
| 603 | |
| 604 | static void __init smp_create_idle(unsigned int cpu) |
| 605 | { |
| 606 | struct task_struct *p; |
| 607 | |
| 608 | /* |
| 609 | * don't care about the psw and regs settings since we'll never |
| 610 | * reschedule the forked task. |
| 611 | */ |
| 612 | p = fork_idle(cpu); |
| 613 | if (IS_ERR(p)) |
| 614 | panic("failed fork for CPU %u: %li", cpu, PTR_ERR(p)); |
| 615 | current_set[cpu] = p; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 616 | spin_lock_init(&(&per_cpu(s390_idle, cpu))->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | } |
| 618 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | /* Upping and downing of CPUs */ |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 620 | int __cpu_up(unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | { |
| 622 | struct task_struct *idle; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 623 | struct _lowcore *cpu_lowcore; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | struct stack_frame *sf; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 625 | sigp_ccode ccode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 627 | if (smp_cpu_state[cpu] != CPU_STATE_CONFIGURED) |
| 628 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | |
| 630 | ccode = signal_processor_p((__u32)(unsigned long)(lowcore_ptr[cpu]), |
| 631 | cpu, sigp_set_prefix); |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 632 | if (ccode) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | printk("sigp_set_prefix failed for cpu %d " |
| 634 | "with condition code %d\n", |
| 635 | (int) cpu, (int) ccode); |
| 636 | return -EIO; |
| 637 | } |
| 638 | |
| 639 | idle = current_set[cpu]; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 640 | cpu_lowcore = lowcore_ptr[cpu]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | cpu_lowcore->kernel_stack = (unsigned long) |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 642 | task_stack_page(idle) + THREAD_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | sf = (struct stack_frame *) (cpu_lowcore->kernel_stack |
| 644 | - sizeof(struct pt_regs) |
| 645 | - sizeof(struct stack_frame)); |
| 646 | memset(sf, 0, sizeof(struct stack_frame)); |
| 647 | sf->gprs[9] = (unsigned long) sf; |
| 648 | cpu_lowcore->save_area[15] = (unsigned long) sf; |
| 649 | __ctl_store(cpu_lowcore->cregs_save_area[0], 0, 15); |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 650 | asm volatile( |
| 651 | " stam 0,15,0(%0)" |
| 652 | : : "a" (&cpu_lowcore->access_regs_save_area) : "memory"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | cpu_lowcore->percpu_offset = __per_cpu_offset[cpu]; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 654 | cpu_lowcore->current_task = (unsigned long) idle; |
| 655 | cpu_lowcore->cpu_data.cpu_nr = cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | eieio(); |
Michael Ryan | 699ff13 | 2006-03-24 03:15:17 -0800 | [diff] [blame] | 657 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 658 | while (signal_processor(cpu, sigp_restart) == sigp_busy) |
Michael Ryan | 699ff13 | 2006-03-24 03:15:17 -0800 | [diff] [blame] | 659 | udelay(10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | |
| 661 | while (!cpu_online(cpu)) |
| 662 | cpu_relax(); |
| 663 | return 0; |
| 664 | } |
| 665 | |
Heiko Carstens | 37a3302 | 2006-02-17 13:52:47 -0800 | [diff] [blame] | 666 | static int __init setup_possible_cpus(char *s) |
| 667 | { |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame^] | 668 | int pcpus, cpu; |
| 669 | |
| 670 | pcpus = simple_strtoul(s, NULL, 0); |
| 671 | cpu_possible_map = cpumask_of_cpu(0); |
| 672 | for (cpu = 1; cpu < pcpus && cpu < NR_CPUS; cpu++) |
| 673 | cpu_set(cpu, cpu_possible_map); |
Heiko Carstens | 37a3302 | 2006-02-17 13:52:47 -0800 | [diff] [blame] | 674 | return 0; |
| 675 | } |
| 676 | early_param("possible_cpus", setup_possible_cpus); |
| 677 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame^] | 678 | #ifdef CONFIG_HOTPLUG_CPU |
| 679 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 680 | int __cpu_disable(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | { |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 682 | struct ec_creg_mask_parms cr_parms; |
Zwane Mwaikambo | f370513 | 2005-06-25 14:54:50 -0700 | [diff] [blame] | 683 | int cpu = smp_processor_id(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | |
Zwane Mwaikambo | f370513 | 2005-06-25 14:54:50 -0700 | [diff] [blame] | 685 | cpu_clear(cpu, cpu_online_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | /* Disable pfault pseudo page faults on this cpu. */ |
Heiko Carstens | 29b08d2 | 2006-12-04 15:40:40 +0100 | [diff] [blame] | 688 | pfault_fini(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 690 | memset(&cr_parms.orvals, 0, sizeof(cr_parms.orvals)); |
| 691 | memset(&cr_parms.andvals, 0xff, sizeof(cr_parms.andvals)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 693 | /* disable all external interrupts */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | cr_parms.orvals[0] = 0; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 695 | cr_parms.andvals[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 12 | |
| 696 | 1 << 11 | 1 << 10 | 1 << 6 | 1 << 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | /* disable all I/O interrupts */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | cr_parms.orvals[6] = 0; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 699 | cr_parms.andvals[6] = ~(1 << 31 | 1 << 30 | 1 << 29 | 1 << 28 | |
| 700 | 1 << 27 | 1 << 26 | 1 << 25 | 1 << 24); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | /* disable most machine checks */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | cr_parms.orvals[14] = 0; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 703 | cr_parms.andvals[14] = ~(1 << 28 | 1 << 27 | 1 << 26 | |
| 704 | 1 << 25 | 1 << 24); |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 705 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | smp_ctl_bit_callback(&cr_parms); |
| 707 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | return 0; |
| 709 | } |
| 710 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 711 | void __cpu_die(unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | { |
| 713 | /* Wait until target cpu is down */ |
| 714 | while (!smp_cpu_not_running(cpu)) |
| 715 | cpu_relax(); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 716 | printk(KERN_INFO "Processor %d spun down\n", cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | } |
| 718 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 719 | void cpu_die(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | { |
| 721 | idle_task_exit(); |
| 722 | signal_processor(smp_processor_id(), sigp_stop); |
| 723 | BUG(); |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 724 | for (;;); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | } |
| 726 | |
Heiko Carstens | 255acee | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 727 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 728 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | /* |
| 730 | * Cycle through the processors and setup structures. |
| 731 | */ |
| 732 | |
| 733 | void __init smp_prepare_cpus(unsigned int max_cpus) |
| 734 | { |
| 735 | unsigned long stack; |
| 736 | unsigned int cpu; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 737 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame^] | 739 | smp_detect_cpus(); |
| 740 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 741 | /* request the 0x1201 emergency signal external interrupt */ |
| 742 | if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0) |
| 743 | panic("Couldn't request external interrupt 0x1201"); |
| 744 | memset(lowcore_ptr, 0, sizeof(lowcore_ptr)); |
| 745 | /* |
| 746 | * Initialize prefix pages and stacks for all possible cpus |
| 747 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | print_cpu_info(&S390_lowcore.cpu_data); |
| 749 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 750 | for_each_possible_cpu(i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | lowcore_ptr[i] = (struct _lowcore *) |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 752 | __get_free_pages(GFP_KERNEL | GFP_DMA, |
| 753 | sizeof(void*) == 8 ? 1 : 0); |
| 754 | stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER); |
| 755 | if (!lowcore_ptr[i] || !stack) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | panic("smp_boot_cpus failed to allocate memory\n"); |
| 757 | |
| 758 | *(lowcore_ptr[i]) = S390_lowcore; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 759 | lowcore_ptr[i]->async_stack = stack + ASYNC_SIZE; |
| 760 | stack = __get_free_pages(GFP_KERNEL, 0); |
| 761 | if (!stack) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | panic("smp_boot_cpus failed to allocate memory\n"); |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 763 | lowcore_ptr[i]->panic_stack = stack + PAGE_SIZE; |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 764 | #ifndef CONFIG_64BIT |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 765 | if (MACHINE_HAS_IEEE) { |
| 766 | lowcore_ptr[i]->extended_save_area_addr = |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 767 | (__u32) __get_free_pages(GFP_KERNEL, 0); |
| 768 | if (!lowcore_ptr[i]->extended_save_area_addr) |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 769 | panic("smp_boot_cpus failed to " |
| 770 | "allocate memory\n"); |
| 771 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | #endif |
| 773 | } |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 774 | #ifndef CONFIG_64BIT |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 775 | if (MACHINE_HAS_IEEE) |
| 776 | ctl_set_bit(14, 29); /* enable extended save area */ |
| 777 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | set_prefix((u32)(unsigned long) lowcore_ptr[smp_processor_id()]); |
| 779 | |
KAMEZAWA Hiroyuki | 97db7fb | 2006-03-31 02:30:26 -0800 | [diff] [blame] | 780 | for_each_possible_cpu(cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | if (cpu != smp_processor_id()) |
| 782 | smp_create_idle(cpu); |
| 783 | } |
| 784 | |
Heiko Carstens | ea1f4ee | 2007-05-31 17:38:05 +0200 | [diff] [blame] | 785 | void __init smp_prepare_boot_cpu(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | { |
| 787 | BUG_ON(smp_processor_id() != 0); |
| 788 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame^] | 789 | current_thread_info()->cpu = 0; |
| 790 | cpu_set(0, cpu_present_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | cpu_set(0, cpu_online_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | S390_lowcore.percpu_offset = __per_cpu_offset[0]; |
| 793 | current_set[0] = current; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 794 | smp_cpu_state[0] = CPU_STATE_CONFIGURED; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 795 | spin_lock_init(&(&__get_cpu_var(s390_idle))->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | } |
| 797 | |
Heiko Carstens | ea1f4ee | 2007-05-31 17:38:05 +0200 | [diff] [blame] | 798 | void __init smp_cpus_done(unsigned int max_cpus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | } |
| 801 | |
| 802 | /* |
| 803 | * the frequency of the profiling timer can be changed |
| 804 | * by writing a multiplier value into /proc/profile. |
| 805 | * |
| 806 | * usually you want to run this on all CPUs ;) |
| 807 | */ |
| 808 | int setup_profiling_timer(unsigned int multiplier) |
| 809 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 810 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | } |
| 812 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 813 | #ifdef CONFIG_HOTPLUG_CPU |
| 814 | static ssize_t cpu_configure_show(struct sys_device *dev, char *buf) |
| 815 | { |
| 816 | ssize_t count; |
| 817 | |
| 818 | mutex_lock(&smp_cpu_state_mutex); |
| 819 | count = sprintf(buf, "%d\n", smp_cpu_state[dev->id]); |
| 820 | mutex_unlock(&smp_cpu_state_mutex); |
| 821 | return count; |
| 822 | } |
| 823 | |
| 824 | static ssize_t cpu_configure_store(struct sys_device *dev, const char *buf, |
| 825 | size_t count) |
| 826 | { |
| 827 | int cpu = dev->id; |
| 828 | int val, rc; |
| 829 | char delim; |
| 830 | |
| 831 | if (sscanf(buf, "%d %c", &val, &delim) != 1) |
| 832 | return -EINVAL; |
| 833 | if (val != 0 && val != 1) |
| 834 | return -EINVAL; |
| 835 | |
| 836 | mutex_lock(&smp_cpu_state_mutex); |
| 837 | lock_cpu_hotplug(); |
| 838 | rc = -EBUSY; |
| 839 | if (cpu_online(cpu)) |
| 840 | goto out; |
| 841 | rc = 0; |
| 842 | switch (val) { |
| 843 | case 0: |
| 844 | if (smp_cpu_state[cpu] == CPU_STATE_CONFIGURED) { |
| 845 | rc = sclp_cpu_deconfigure(__cpu_logical_map[cpu]); |
| 846 | if (!rc) |
| 847 | smp_cpu_state[cpu] = CPU_STATE_STANDBY; |
| 848 | } |
| 849 | break; |
| 850 | case 1: |
| 851 | if (smp_cpu_state[cpu] == CPU_STATE_STANDBY) { |
| 852 | rc = sclp_cpu_configure(__cpu_logical_map[cpu]); |
| 853 | if (!rc) |
| 854 | smp_cpu_state[cpu] = CPU_STATE_CONFIGURED; |
| 855 | } |
| 856 | break; |
| 857 | default: |
| 858 | break; |
| 859 | } |
| 860 | out: |
| 861 | unlock_cpu_hotplug(); |
| 862 | mutex_unlock(&smp_cpu_state_mutex); |
| 863 | return rc ? rc : count; |
| 864 | } |
| 865 | static SYSDEV_ATTR(configure, 0644, cpu_configure_show, cpu_configure_store); |
| 866 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 867 | |
| 868 | static ssize_t show_cpu_address(struct sys_device *dev, char *buf) |
| 869 | { |
| 870 | return sprintf(buf, "%d\n", __cpu_logical_map[dev->id]); |
| 871 | } |
| 872 | static SYSDEV_ATTR(address, 0444, show_cpu_address, NULL); |
| 873 | |
| 874 | |
| 875 | static struct attribute *cpu_common_attrs[] = { |
| 876 | #ifdef CONFIG_HOTPLUG_CPU |
| 877 | &attr_configure.attr, |
| 878 | #endif |
| 879 | &attr_address.attr, |
| 880 | NULL, |
| 881 | }; |
| 882 | |
| 883 | static struct attribute_group cpu_common_attr_group = { |
| 884 | .attrs = cpu_common_attrs, |
| 885 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 887 | static ssize_t show_capability(struct sys_device *dev, char *buf) |
| 888 | { |
| 889 | unsigned int capability; |
| 890 | int rc; |
| 891 | |
| 892 | rc = get_cpu_capability(&capability); |
| 893 | if (rc) |
| 894 | return rc; |
| 895 | return sprintf(buf, "%u\n", capability); |
| 896 | } |
| 897 | static SYSDEV_ATTR(capability, 0444, show_capability, NULL); |
| 898 | |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 899 | static ssize_t show_idle_count(struct sys_device *dev, char *buf) |
| 900 | { |
| 901 | struct s390_idle_data *idle; |
| 902 | unsigned long long idle_count; |
| 903 | |
| 904 | idle = &per_cpu(s390_idle, dev->id); |
| 905 | spin_lock_irq(&idle->lock); |
| 906 | idle_count = idle->idle_count; |
| 907 | spin_unlock_irq(&idle->lock); |
| 908 | return sprintf(buf, "%llu\n", idle_count); |
| 909 | } |
| 910 | static SYSDEV_ATTR(idle_count, 0444, show_idle_count, NULL); |
| 911 | |
| 912 | static ssize_t show_idle_time(struct sys_device *dev, char *buf) |
| 913 | { |
| 914 | struct s390_idle_data *idle; |
| 915 | unsigned long long new_time; |
| 916 | |
| 917 | idle = &per_cpu(s390_idle, dev->id); |
| 918 | spin_lock_irq(&idle->lock); |
| 919 | if (idle->in_idle) { |
| 920 | new_time = get_clock(); |
| 921 | idle->idle_time += new_time - idle->idle_enter; |
| 922 | idle->idle_enter = new_time; |
| 923 | } |
| 924 | new_time = idle->idle_time; |
| 925 | spin_unlock_irq(&idle->lock); |
Heiko Carstens | 69d39d6 | 2007-11-05 11:10:13 +0100 | [diff] [blame] | 926 | return sprintf(buf, "%llu\n", new_time >> 12); |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 927 | } |
Heiko Carstens | 69d39d6 | 2007-11-05 11:10:13 +0100 | [diff] [blame] | 928 | static SYSDEV_ATTR(idle_time_us, 0444, show_idle_time, NULL); |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 929 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 930 | static struct attribute *cpu_online_attrs[] = { |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 931 | &attr_capability.attr, |
| 932 | &attr_idle_count.attr, |
Heiko Carstens | 69d39d6 | 2007-11-05 11:10:13 +0100 | [diff] [blame] | 933 | &attr_idle_time_us.attr, |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 934 | NULL, |
| 935 | }; |
| 936 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 937 | static struct attribute_group cpu_online_attr_group = { |
| 938 | .attrs = cpu_online_attrs, |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 939 | }; |
| 940 | |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 941 | static int __cpuinit smp_cpu_notify(struct notifier_block *self, |
| 942 | unsigned long action, void *hcpu) |
| 943 | { |
| 944 | unsigned int cpu = (unsigned int)(long)hcpu; |
| 945 | struct cpu *c = &per_cpu(cpu_devices, cpu); |
| 946 | struct sys_device *s = &c->sysdev; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 947 | struct s390_idle_data *idle; |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 948 | |
| 949 | switch (action) { |
| 950 | case CPU_ONLINE: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 951 | case CPU_ONLINE_FROZEN: |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 952 | idle = &per_cpu(s390_idle, cpu); |
| 953 | spin_lock_irq(&idle->lock); |
| 954 | idle->idle_enter = 0; |
| 955 | idle->idle_time = 0; |
| 956 | idle->idle_count = 0; |
| 957 | spin_unlock_irq(&idle->lock); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 958 | if (sysfs_create_group(&s->kobj, &cpu_online_attr_group)) |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 959 | return NOTIFY_BAD; |
| 960 | break; |
| 961 | case CPU_DEAD: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 962 | case CPU_DEAD_FROZEN: |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 963 | sysfs_remove_group(&s->kobj, &cpu_online_attr_group); |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 964 | break; |
| 965 | } |
| 966 | return NOTIFY_OK; |
| 967 | } |
| 968 | |
| 969 | static struct notifier_block __cpuinitdata smp_cpu_nb = { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 970 | .notifier_call = smp_cpu_notify, |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 971 | }; |
| 972 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 973 | static int smp_add_present_cpu(int cpu) |
| 974 | { |
| 975 | struct cpu *c = &per_cpu(cpu_devices, cpu); |
| 976 | struct sys_device *s = &c->sysdev; |
| 977 | int rc; |
| 978 | |
| 979 | c->hotpluggable = 1; |
| 980 | rc = register_cpu(c, cpu); |
| 981 | if (rc) |
| 982 | goto out; |
| 983 | rc = sysfs_create_group(&s->kobj, &cpu_common_attr_group); |
| 984 | if (rc) |
| 985 | goto out_cpu; |
| 986 | if (!cpu_online(cpu)) |
| 987 | goto out; |
| 988 | rc = sysfs_create_group(&s->kobj, &cpu_online_attr_group); |
| 989 | if (!rc) |
| 990 | return 0; |
| 991 | sysfs_remove_group(&s->kobj, &cpu_common_attr_group); |
| 992 | out_cpu: |
| 993 | #ifdef CONFIG_HOTPLUG_CPU |
| 994 | unregister_cpu(c); |
| 995 | #endif |
| 996 | out: |
| 997 | return rc; |
| 998 | } |
| 999 | |
| 1000 | #ifdef CONFIG_HOTPLUG_CPU |
| 1001 | static ssize_t rescan_store(struct sys_device *dev, const char *buf, |
| 1002 | size_t count) |
| 1003 | { |
| 1004 | cpumask_t newcpus; |
| 1005 | int cpu; |
| 1006 | int rc; |
| 1007 | |
| 1008 | mutex_lock(&smp_cpu_state_mutex); |
| 1009 | lock_cpu_hotplug(); |
| 1010 | newcpus = cpu_present_map; |
| 1011 | rc = smp_rescan_cpus(); |
| 1012 | if (rc) |
| 1013 | goto out; |
| 1014 | cpus_andnot(newcpus, cpu_present_map, newcpus); |
| 1015 | for_each_cpu_mask(cpu, newcpus) { |
| 1016 | rc = smp_add_present_cpu(cpu); |
| 1017 | if (rc) |
| 1018 | cpu_clear(cpu, cpu_present_map); |
| 1019 | } |
| 1020 | rc = 0; |
| 1021 | out: |
| 1022 | unlock_cpu_hotplug(); |
| 1023 | mutex_unlock(&smp_cpu_state_mutex); |
| 1024 | return rc ? rc : count; |
| 1025 | } |
| 1026 | static SYSDEV_ATTR(rescan, 0200, NULL, rescan_store); |
| 1027 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 1028 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | static int __init topology_init(void) |
| 1030 | { |
| 1031 | int cpu; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 1032 | int rc; |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 1033 | |
| 1034 | register_cpu_notifier(&smp_cpu_nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1036 | #ifdef CONFIG_HOTPLUG_CPU |
| 1037 | rc = sysfs_create_file(&cpu_sysdev_class.kset.kobj, |
| 1038 | &attr_rescan.attr); |
| 1039 | if (rc) |
| 1040 | return rc; |
| 1041 | #endif |
| 1042 | for_each_present_cpu(cpu) { |
| 1043 | rc = smp_add_present_cpu(cpu); |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 1044 | if (rc) |
| 1045 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | } |
| 1047 | return 0; |
| 1048 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | subsys_initcall(topology_init); |