Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * SMP Support |
| 3 | * |
| 4 | * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> |
| 5 | * Copyright (C) 1999, 2001, 2003 David Mosberger-Tang <davidm@hpl.hp.com> |
| 6 | * |
| 7 | * Lots of stuff stolen from arch/alpha/kernel/smp.c |
| 8 | * |
| 9 | * 01/05/16 Rohit Seth <rohit.seth@intel.com> IA64-SMP functions. Reorganized |
| 10 | * the existing code (on the lines of x86 port). |
| 11 | * 00/09/11 David Mosberger <davidm@hpl.hp.com> Do loops_per_jiffy |
| 12 | * calibration on each CPU. |
| 13 | * 00/08/23 Asit Mallick <asit.k.mallick@intel.com> fixed logical processor id |
| 14 | * 00/03/31 Rohit Seth <rohit.seth@intel.com> Fixes for Bootstrap Processor |
| 15 | * & cpu_online_map now gets done here (instead of setup.c) |
| 16 | * 99/10/05 davidm Update to bring it in sync with new command-line processing |
| 17 | * scheme. |
| 18 | * 10/13/00 Goutham Rao <goutham.rao@intel.com> Updated smp_call_function and |
| 19 | * smp_call_function_single to resend IPI on timeouts |
| 20 | */ |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/sched.h> |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/interrupt.h> |
| 26 | #include <linux/smp.h> |
| 27 | #include <linux/kernel_stat.h> |
| 28 | #include <linux/mm.h> |
| 29 | #include <linux/cache.h> |
| 30 | #include <linux/delay.h> |
| 31 | #include <linux/efi.h> |
| 32 | #include <linux/bitops.h> |
Zou Nan hai | a7956113 | 2006-12-07 09:51:35 -0800 | [diff] [blame] | 33 | #include <linux/kexec.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
| 35 | #include <asm/atomic.h> |
| 36 | #include <asm/current.h> |
| 37 | #include <asm/delay.h> |
| 38 | #include <asm/machvec.h> |
| 39 | #include <asm/io.h> |
| 40 | #include <asm/irq.h> |
| 41 | #include <asm/page.h> |
| 42 | #include <asm/pgalloc.h> |
| 43 | #include <asm/pgtable.h> |
| 44 | #include <asm/processor.h> |
| 45 | #include <asm/ptrace.h> |
| 46 | #include <asm/sal.h> |
| 47 | #include <asm/system.h> |
| 48 | #include <asm/tlbflush.h> |
| 49 | #include <asm/unistd.h> |
| 50 | #include <asm/mca.h> |
| 51 | |
| 52 | /* |
Jack Steiner | 3be44b9 | 2007-05-08 14:50:43 -0700 | [diff] [blame] | 53 | * Note: alignment of 4 entries/cacheline was empirically determined |
| 54 | * to be a good tradeoff between hot cachelines & spreading the array |
| 55 | * across too many cacheline. |
| 56 | */ |
| 57 | static struct local_tlb_flush_counts { |
| 58 | unsigned int count; |
| 59 | } __attribute__((__aligned__(32))) local_tlb_flush_counts[NR_CPUS]; |
| 60 | |
Tejun Heo | b9bf312 | 2009-06-24 15:13:47 +0900 | [diff] [blame] | 61 | static DEFINE_PER_CPU_SHARED_ALIGNED(unsigned short [NR_CPUS], |
| 62 | shadow_flush_counts); |
Jack Steiner | 3be44b9 | 2007-05-08 14:50:43 -0700 | [diff] [blame] | 63 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | #define IPI_CALL_FUNC 0 |
| 65 | #define IPI_CPU_STOP 1 |
Jens Axboe | f27b433 | 2008-06-26 11:22:30 +0200 | [diff] [blame] | 66 | #define IPI_CALL_FUNC_SINGLE 2 |
Zou Nan hai | a7956113 | 2006-12-07 09:51:35 -0800 | [diff] [blame] | 67 | #define IPI_KDUMP_CPU_STOP 3 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
| 69 | /* This needs to be cacheline aligned because it is written to by *other* CPUs. */ |
Matthew Wilcox | e088a4a | 2009-05-22 13:49:49 -0700 | [diff] [blame] | 70 | static DEFINE_PER_CPU_SHARED_ALIGNED(unsigned long, ipi_operation); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
| 72 | extern void cpu_halt (void); |
| 73 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | static void |
Hidetoshi Seto | c0cd661 | 2008-04-30 18:55:48 +0900 | [diff] [blame] | 75 | stop_this_cpu(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | { |
| 77 | /* |
| 78 | * Remove this CPU: |
| 79 | */ |
| 80 | cpu_clear(smp_processor_id(), cpu_online_map); |
| 81 | max_xtp(); |
| 82 | local_irq_disable(); |
| 83 | cpu_halt(); |
| 84 | } |
| 85 | |
| 86 | void |
| 87 | cpu_die(void) |
| 88 | { |
| 89 | max_xtp(); |
| 90 | local_irq_disable(); |
| 91 | cpu_halt(); |
| 92 | /* Should never be here */ |
| 93 | BUG(); |
| 94 | for (;;); |
| 95 | } |
| 96 | |
| 97 | irqreturn_t |
Keith Owens | 024e4f2 | 2006-10-18 15:36:49 +1000 | [diff] [blame] | 98 | handle_IPI (int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | { |
| 100 | int this_cpu = get_cpu(); |
| 101 | unsigned long *pending_ipis = &__ia64_per_cpu_var(ipi_operation); |
| 102 | unsigned long ops; |
| 103 | |
| 104 | mb(); /* Order interrupt and bit testing. */ |
| 105 | while ((ops = xchg(pending_ipis, 0)) != 0) { |
| 106 | mb(); /* Order bit clearing and data access. */ |
| 107 | do { |
| 108 | unsigned long which; |
| 109 | |
| 110 | which = ffz(~ops); |
| 111 | ops &= ~(1 << which); |
| 112 | |
| 113 | switch (which) { |
Hidetoshi Seto | c0cd661 | 2008-04-30 18:55:48 +0900 | [diff] [blame] | 114 | case IPI_CPU_STOP: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | stop_this_cpu(); |
| 116 | break; |
Jens Axboe | f27b433 | 2008-06-26 11:22:30 +0200 | [diff] [blame] | 117 | case IPI_CALL_FUNC: |
| 118 | generic_smp_call_function_interrupt(); |
| 119 | break; |
| 120 | case IPI_CALL_FUNC_SINGLE: |
| 121 | generic_smp_call_function_single_interrupt(); |
| 122 | break; |
Horms | 45a98fc | 2006-12-12 17:49:03 +0900 | [diff] [blame] | 123 | #ifdef CONFIG_KEXEC |
Hidetoshi Seto | c0cd661 | 2008-04-30 18:55:48 +0900 | [diff] [blame] | 124 | case IPI_KDUMP_CPU_STOP: |
Zou Nan hai | a7956113 | 2006-12-07 09:51:35 -0800 | [diff] [blame] | 125 | unw_init_running(kdump_cpu_freeze, NULL); |
| 126 | break; |
| 127 | #endif |
Hidetoshi Seto | c0cd661 | 2008-04-30 18:55:48 +0900 | [diff] [blame] | 128 | default: |
| 129 | printk(KERN_CRIT "Unknown IPI on CPU %d: %lu\n", |
| 130 | this_cpu, which); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | break; |
| 132 | } |
| 133 | } while (ops); |
| 134 | mb(); /* Order data access and bit testing. */ |
| 135 | } |
| 136 | put_cpu(); |
| 137 | return IRQ_HANDLED; |
| 138 | } |
| 139 | |
Jens Axboe | f27b433 | 2008-06-26 11:22:30 +0200 | [diff] [blame] | 140 | |
| 141 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | /* |
Simon Arlott | 72fdbdc | 2007-05-11 14:55:43 -0700 | [diff] [blame] | 143 | * Called with preemption disabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | */ |
| 145 | static inline void |
| 146 | send_IPI_single (int dest_cpu, int op) |
| 147 | { |
| 148 | set_bit(op, &per_cpu(ipi_operation, dest_cpu)); |
| 149 | platform_send_ipi(dest_cpu, IA64_IPI_VECTOR, IA64_IPI_DM_INT, 0); |
| 150 | } |
| 151 | |
| 152 | /* |
Simon Arlott | 72fdbdc | 2007-05-11 14:55:43 -0700 | [diff] [blame] | 153 | * Called with preemption disabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | */ |
| 155 | static inline void |
| 156 | send_IPI_allbutself (int op) |
| 157 | { |
| 158 | unsigned int i; |
| 159 | |
hawkes@sgi.com | dc565b5 | 2005-10-10 08:43:26 -0700 | [diff] [blame] | 160 | for_each_online_cpu(i) { |
| 161 | if (i != smp_processor_id()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | send_IPI_single(i, op); |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | /* |
Simon Arlott | 72fdbdc | 2007-05-11 14:55:43 -0700 | [diff] [blame] | 167 | * Called with preemption disabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | */ |
| 169 | static inline void |
Rusty Russell | 40fe697 | 2009-03-16 14:12:41 +1030 | [diff] [blame] | 170 | send_IPI_mask(const struct cpumask *mask, int op) |
Xiantao Zhang | 31a6b11 | 2008-04-03 11:39:43 -0700 | [diff] [blame] | 171 | { |
| 172 | unsigned int cpu; |
| 173 | |
Rusty Russell | 40fe697 | 2009-03-16 14:12:41 +1030 | [diff] [blame] | 174 | for_each_cpu(cpu, mask) { |
Xiantao Zhang | 31a6b11 | 2008-04-03 11:39:43 -0700 | [diff] [blame] | 175 | send_IPI_single(cpu, op); |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | /* |
| 180 | * Called with preemption disabled. |
| 181 | */ |
| 182 | static inline void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | send_IPI_all (int op) |
| 184 | { |
| 185 | int i; |
| 186 | |
hawkes@sgi.com | dc565b5 | 2005-10-10 08:43:26 -0700 | [diff] [blame] | 187 | for_each_online_cpu(i) { |
| 188 | send_IPI_single(i, op); |
| 189 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | /* |
Simon Arlott | 72fdbdc | 2007-05-11 14:55:43 -0700 | [diff] [blame] | 193 | * Called with preemption disabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | */ |
| 195 | static inline void |
| 196 | send_IPI_self (int op) |
| 197 | { |
| 198 | send_IPI_single(smp_processor_id(), op); |
| 199 | } |
| 200 | |
Horms | 45a98fc | 2006-12-12 17:49:03 +0900 | [diff] [blame] | 201 | #ifdef CONFIG_KEXEC |
Zou Nan hai | a7956113 | 2006-12-07 09:51:35 -0800 | [diff] [blame] | 202 | void |
Al Viro | ccbebda | 2007-02-09 16:38:10 +0000 | [diff] [blame] | 203 | kdump_smp_send_stop(void) |
Zou Nan hai | a7956113 | 2006-12-07 09:51:35 -0800 | [diff] [blame] | 204 | { |
| 205 | send_IPI_allbutself(IPI_KDUMP_CPU_STOP); |
| 206 | } |
| 207 | |
| 208 | void |
Al Viro | ccbebda | 2007-02-09 16:38:10 +0000 | [diff] [blame] | 209 | kdump_smp_send_init(void) |
Zou Nan hai | a7956113 | 2006-12-07 09:51:35 -0800 | [diff] [blame] | 210 | { |
| 211 | unsigned int cpu, self_cpu; |
| 212 | self_cpu = smp_processor_id(); |
| 213 | for_each_online_cpu(cpu) { |
| 214 | if (cpu != self_cpu) { |
| 215 | if(kdump_status[cpu] == 0) |
| 216 | platform_send_ipi(cpu, 0, IA64_IPI_DM_INIT, 0); |
| 217 | } |
| 218 | } |
| 219 | } |
| 220 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | /* |
Simon Arlott | 72fdbdc | 2007-05-11 14:55:43 -0700 | [diff] [blame] | 222 | * Called with preemption disabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | */ |
| 224 | void |
| 225 | smp_send_reschedule (int cpu) |
| 226 | { |
| 227 | platform_send_ipi(cpu, IA64_IPI_RESCHEDULE, IA64_IPI_DM_INT, 0); |
| 228 | } |
Marcelo Tosatti | c4cb768 | 2009-04-14 18:08:37 -0300 | [diff] [blame] | 229 | EXPORT_SYMBOL_GPL(smp_send_reschedule); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | |
Jack Steiner | 3be44b9 | 2007-05-08 14:50:43 -0700 | [diff] [blame] | 231 | /* |
Simon Arlott | 72fdbdc | 2007-05-11 14:55:43 -0700 | [diff] [blame] | 232 | * Called with preemption disabled. |
Jack Steiner | 3be44b9 | 2007-05-08 14:50:43 -0700 | [diff] [blame] | 233 | */ |
| 234 | static void |
| 235 | smp_send_local_flush_tlb (int cpu) |
| 236 | { |
| 237 | platform_send_ipi(cpu, IA64_IPI_LOCAL_TLB_FLUSH, IA64_IPI_DM_INT, 0); |
| 238 | } |
| 239 | |
| 240 | void |
| 241 | smp_local_flush_tlb(void) |
| 242 | { |
| 243 | /* |
| 244 | * Use atomic ops. Otherwise, the load/increment/store sequence from |
| 245 | * a "++" operation can have the line stolen between the load & store. |
| 246 | * The overhead of the atomic op in negligible in this case & offers |
| 247 | * significant benefit for the brief periods where lots of cpus |
| 248 | * are simultaneously flushing TLBs. |
| 249 | */ |
| 250 | ia64_fetchadd(1, &local_tlb_flush_counts[smp_processor_id()].count, acq); |
| 251 | local_flush_tlb_all(); |
| 252 | } |
| 253 | |
| 254 | #define FLUSH_DELAY 5 /* Usec backoff to eliminate excessive cacheline bouncing */ |
| 255 | |
| 256 | void |
| 257 | smp_flush_tlb_cpumask(cpumask_t xcpumask) |
| 258 | { |
Robin Holt | 97653f9 | 2008-08-15 09:21:24 -0500 | [diff] [blame] | 259 | unsigned short *counts = __ia64_per_cpu_var(shadow_flush_counts); |
Jack Steiner | 3be44b9 | 2007-05-08 14:50:43 -0700 | [diff] [blame] | 260 | cpumask_t cpumask = xcpumask; |
| 261 | int mycpu, cpu, flush_mycpu = 0; |
| 262 | |
| 263 | preempt_disable(); |
| 264 | mycpu = smp_processor_id(); |
| 265 | |
| 266 | for_each_cpu_mask(cpu, cpumask) |
Robin Holt | 97653f9 | 2008-08-15 09:21:24 -0500 | [diff] [blame] | 267 | counts[cpu] = local_tlb_flush_counts[cpu].count & 0xffff; |
Jack Steiner | 3be44b9 | 2007-05-08 14:50:43 -0700 | [diff] [blame] | 268 | |
| 269 | mb(); |
| 270 | for_each_cpu_mask(cpu, cpumask) { |
| 271 | if (cpu == mycpu) |
| 272 | flush_mycpu = 1; |
| 273 | else |
| 274 | smp_send_local_flush_tlb(cpu); |
| 275 | } |
| 276 | |
| 277 | if (flush_mycpu) |
| 278 | smp_local_flush_tlb(); |
| 279 | |
| 280 | for_each_cpu_mask(cpu, cpumask) |
Robin Holt | 97653f9 | 2008-08-15 09:21:24 -0500 | [diff] [blame] | 281 | while(counts[cpu] == (local_tlb_flush_counts[cpu].count & 0xffff)) |
Jack Steiner | 3be44b9 | 2007-05-08 14:50:43 -0700 | [diff] [blame] | 282 | udelay(FLUSH_DELAY); |
| 283 | |
| 284 | preempt_enable(); |
| 285 | } |
| 286 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | void |
| 288 | smp_flush_tlb_all (void) |
| 289 | { |
Jens Axboe | 15c8b6c | 2008-05-09 09:39:44 +0200 | [diff] [blame] | 290 | on_each_cpu((void (*)(void *))local_flush_tlb_all, NULL, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | } |
| 292 | |
| 293 | void |
| 294 | smp_flush_tlb_mm (struct mm_struct *mm) |
| 295 | { |
Dimitri Sivanich | 75c1c91 | 2010-12-28 13:34:42 -0600 | [diff] [blame] | 296 | cpumask_var_t cpus; |
Peter Chubb | a68db763 | 2005-06-23 21:14:00 -0700 | [diff] [blame] | 297 | preempt_disable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | /* this happens for the common case of a single-threaded fork(): */ |
| 299 | if (likely(mm == current->active_mm && atomic_read(&mm->mm_users) == 1)) |
| 300 | { |
| 301 | local_finish_flush_tlb_mm(mm); |
Peter Chubb | a68db763 | 2005-06-23 21:14:00 -0700 | [diff] [blame] | 302 | preempt_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | return; |
| 304 | } |
Dimitri Sivanich | 75c1c91 | 2010-12-28 13:34:42 -0600 | [diff] [blame] | 305 | if (!alloc_cpumask_var(&cpus, GFP_ATOMIC)) { |
| 306 | smp_call_function((void (*)(void *))local_finish_flush_tlb_mm, |
| 307 | mm, 1); |
| 308 | } else { |
| 309 | cpumask_copy(cpus, mm_cpumask(mm)); |
| 310 | smp_call_function_many(cpus, |
| 311 | (void (*)(void *))local_finish_flush_tlb_mm, mm, 1); |
| 312 | free_cpumask_var(cpus); |
| 313 | } |
Dimitri Sivanich | edb91dc | 2009-04-15 10:56:25 -0500 | [diff] [blame] | 314 | local_irq_disable(); |
| 315 | local_finish_flush_tlb_mm(mm); |
| 316 | local_irq_enable(); |
Peter Chubb | a68db763 | 2005-06-23 21:14:00 -0700 | [diff] [blame] | 317 | preempt_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | } |
| 319 | |
Jens Axboe | f27b433 | 2008-06-26 11:22:30 +0200 | [diff] [blame] | 320 | void arch_send_call_function_single_ipi(int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | { |
Jens Axboe | f27b433 | 2008-06-26 11:22:30 +0200 | [diff] [blame] | 322 | send_IPI_single(cpu, IPI_CALL_FUNC_SINGLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | |
Rusty Russell | 40fe697 | 2009-03-16 14:12:41 +1030 | [diff] [blame] | 325 | void arch_send_call_function_ipi_mask(const struct cpumask *mask) |
Xiantao Zhang | 31a6b11 | 2008-04-03 11:39:43 -0700 | [diff] [blame] | 326 | { |
Jens Axboe | f27b433 | 2008-06-26 11:22:30 +0200 | [diff] [blame] | 327 | send_IPI_mask(mask, IPI_CALL_FUNC); |
Xiantao Zhang | 31a6b11 | 2008-04-03 11:39:43 -0700 | [diff] [blame] | 328 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | |
| 330 | /* |
| 331 | * this function calls the 'stop' function on all other CPUs in the system. |
| 332 | */ |
| 333 | void |
| 334 | smp_send_stop (void) |
| 335 | { |
| 336 | send_IPI_allbutself(IPI_CPU_STOP); |
| 337 | } |
| 338 | |
Tony Luck | cb2e091 | 2007-07-20 16:14:28 -0700 | [diff] [blame] | 339 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | setup_profiling_timer (unsigned int multiplier) |
| 341 | { |
| 342 | return -EINVAL; |
| 343 | } |