Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/alpha/kernel/smp.c |
| 3 | * |
| 4 | * 2001-07-09 Phil Ezolt (Phillip.Ezolt@compaq.com) |
| 5 | * Renamed modified smp_call_function to smp_call_function_on_cpu() |
| 6 | * Created an function that conforms to the old calling convention |
| 7 | * of smp_call_function(). |
| 8 | * |
| 9 | * This is helpful for DCPI. |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #include <linux/errno.h> |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/kernel_stat.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/sched.h> |
| 18 | #include <linux/mm.h> |
Alexey Dobriyan | 4e950f6 | 2007-07-30 02:36:13 +0400 | [diff] [blame] | 19 | #include <linux/err.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/threads.h> |
| 21 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/interrupt.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/delay.h> |
| 25 | #include <linux/spinlock.h> |
| 26 | #include <linux/irq.h> |
| 27 | #include <linux/cache.h> |
| 28 | #include <linux/profile.h> |
| 29 | #include <linux/bitops.h> |
Alexey Dobriyan | 574f34c | 2008-10-15 22:01:19 -0700 | [diff] [blame] | 30 | #include <linux/cpu.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
| 32 | #include <asm/hwrpb.h> |
| 33 | #include <asm/ptrace.h> |
| 34 | #include <asm/atomic.h> |
| 35 | |
| 36 | #include <asm/io.h> |
| 37 | #include <asm/irq.h> |
| 38 | #include <asm/pgtable.h> |
| 39 | #include <asm/pgalloc.h> |
| 40 | #include <asm/mmu_context.h> |
| 41 | #include <asm/tlbflush.h> |
| 42 | |
| 43 | #include "proto.h" |
| 44 | #include "irq_impl.h" |
| 45 | |
| 46 | |
| 47 | #define DEBUG_SMP 0 |
| 48 | #if DEBUG_SMP |
| 49 | #define DBGS(args) printk args |
| 50 | #else |
| 51 | #define DBGS(args) |
| 52 | #endif |
| 53 | |
| 54 | /* A collection of per-processor data. */ |
| 55 | struct cpuinfo_alpha cpu_data[NR_CPUS]; |
Al Viro | cff52da | 2006-10-11 17:40:22 +0100 | [diff] [blame] | 56 | EXPORT_SYMBOL(cpu_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
| 58 | /* A collection of single bit ipi messages. */ |
| 59 | static struct { |
| 60 | unsigned long bits ____cacheline_aligned; |
| 61 | } ipi_data[NR_CPUS] __cacheline_aligned; |
| 62 | |
| 63 | enum ipi_message_type { |
| 64 | IPI_RESCHEDULE, |
| 65 | IPI_CALL_FUNC, |
Jens Axboe | c524a1d | 2008-06-10 20:47:29 +0200 | [diff] [blame] | 66 | IPI_CALL_FUNC_SINGLE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | IPI_CPU_STOP, |
| 68 | }; |
| 69 | |
| 70 | /* Set to a secondary's cpuid when it comes online. */ |
Al Viro | cc040a8 | 2007-07-17 08:49:35 +0100 | [diff] [blame] | 71 | static int smp_secondary_alive __devinitdata = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | int smp_num_probed; /* Internal processor count */ |
| 74 | int smp_num_cpus = 1; /* Number that came online. */ |
Al Viro | cff52da | 2006-10-11 17:40:22 +0100 | [diff] [blame] | 75 | EXPORT_SYMBOL(smp_num_cpus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | /* |
| 78 | * Called by both boot and secondaries to move global data into |
| 79 | * per-processor storage. |
| 80 | */ |
| 81 | static inline void __init |
| 82 | smp_store_cpu_info(int cpuid) |
| 83 | { |
| 84 | cpu_data[cpuid].loops_per_jiffy = loops_per_jiffy; |
| 85 | cpu_data[cpuid].last_asn = ASN_FIRST_VERSION; |
| 86 | cpu_data[cpuid].need_new_asn = 0; |
| 87 | cpu_data[cpuid].asn_lock = 0; |
| 88 | } |
| 89 | |
| 90 | /* |
| 91 | * Ideally sets up per-cpu profiling hooks. Doesn't do much now... |
| 92 | */ |
| 93 | static inline void __init |
| 94 | smp_setup_percpu_timer(int cpuid) |
| 95 | { |
| 96 | cpu_data[cpuid].prof_counter = 1; |
| 97 | cpu_data[cpuid].prof_multiplier = 1; |
| 98 | } |
| 99 | |
| 100 | static void __init |
| 101 | wait_boot_cpu_to_stop(int cpuid) |
| 102 | { |
| 103 | unsigned long stop = jiffies + 10*HZ; |
| 104 | |
| 105 | while (time_before(jiffies, stop)) { |
| 106 | if (!smp_secondary_alive) |
| 107 | return; |
| 108 | barrier(); |
| 109 | } |
| 110 | |
| 111 | printk("wait_boot_cpu_to_stop: FAILED on CPU %d, hanging now\n", cpuid); |
| 112 | for (;;) |
| 113 | barrier(); |
| 114 | } |
| 115 | |
| 116 | /* |
| 117 | * Where secondaries begin a life of C. |
| 118 | */ |
Al Viro | 7d6a8a1 | 2008-11-22 17:33:34 +0000 | [diff] [blame] | 119 | void __cpuinit |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | smp_callin(void) |
| 121 | { |
| 122 | int cpuid = hard_smp_processor_id(); |
| 123 | |
| 124 | if (cpu_test_and_set(cpuid, cpu_online_map)) { |
| 125 | printk("??, cpu 0x%x already present??\n", cpuid); |
| 126 | BUG(); |
| 127 | } |
| 128 | |
| 129 | /* Turn on machine checks. */ |
| 130 | wrmces(7); |
| 131 | |
| 132 | /* Set trap vectors. */ |
| 133 | trap_init(); |
| 134 | |
| 135 | /* Set interrupt vector. */ |
| 136 | wrent(entInt, 0); |
| 137 | |
| 138 | /* Get our local ticker going. */ |
| 139 | smp_setup_percpu_timer(cpuid); |
| 140 | |
| 141 | /* Call platform-specific callin, if specified */ |
| 142 | if (alpha_mv.smp_callin) alpha_mv.smp_callin(); |
| 143 | |
| 144 | /* All kernel threads share the same mm context. */ |
| 145 | atomic_inc(&init_mm.mm_count); |
| 146 | current->active_mm = &init_mm; |
| 147 | |
Manfred Spraul | e545a61 | 2008-09-07 16:57:22 +0200 | [diff] [blame] | 148 | /* inform the notifiers about the new cpu */ |
| 149 | notify_cpu_starting(cpuid); |
| 150 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | /* Must have completely accurate bogos. */ |
| 152 | local_irq_enable(); |
| 153 | |
| 154 | /* Wait boot CPU to stop with irq enabled before running |
| 155 | calibrate_delay. */ |
| 156 | wait_boot_cpu_to_stop(cpuid); |
| 157 | mb(); |
| 158 | calibrate_delay(); |
| 159 | |
| 160 | smp_store_cpu_info(cpuid); |
| 161 | /* Allow master to continue only after we written loops_per_jiffy. */ |
| 162 | wmb(); |
| 163 | smp_secondary_alive = 1; |
| 164 | |
| 165 | DBGS(("smp_callin: commencing CPU %d current %p active_mm %p\n", |
| 166 | cpuid, current, current->active_mm)); |
| 167 | |
| 168 | /* Do nothing. */ |
| 169 | cpu_idle(); |
| 170 | } |
| 171 | |
| 172 | /* Wait until hwrpb->txrdy is clear for cpu. Return -1 on timeout. */ |
Al Viro | cc040a8 | 2007-07-17 08:49:35 +0100 | [diff] [blame] | 173 | static int __devinit |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | wait_for_txrdy (unsigned long cpumask) |
| 175 | { |
| 176 | unsigned long timeout; |
| 177 | |
| 178 | if (!(hwrpb->txrdy & cpumask)) |
| 179 | return 0; |
| 180 | |
| 181 | timeout = jiffies + 10*HZ; |
| 182 | while (time_before(jiffies, timeout)) { |
| 183 | if (!(hwrpb->txrdy & cpumask)) |
| 184 | return 0; |
| 185 | udelay(10); |
| 186 | barrier(); |
| 187 | } |
| 188 | |
| 189 | return -1; |
| 190 | } |
| 191 | |
| 192 | /* |
| 193 | * Send a message to a secondary's console. "START" is one such |
| 194 | * interesting message. ;-) |
| 195 | */ |
Al Viro | 7d6a8a1 | 2008-11-22 17:33:34 +0000 | [diff] [blame] | 196 | static void __cpuinit |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | send_secondary_console_msg(char *str, int cpuid) |
| 198 | { |
| 199 | struct percpu_struct *cpu; |
| 200 | register char *cp1, *cp2; |
| 201 | unsigned long cpumask; |
| 202 | size_t len; |
| 203 | |
| 204 | cpu = (struct percpu_struct *) |
| 205 | ((char*)hwrpb |
| 206 | + hwrpb->processor_offset |
| 207 | + cpuid * hwrpb->processor_size); |
| 208 | |
| 209 | cpumask = (1UL << cpuid); |
| 210 | if (wait_for_txrdy(cpumask)) |
| 211 | goto timeout; |
| 212 | |
| 213 | cp2 = str; |
| 214 | len = strlen(cp2); |
| 215 | *(unsigned int *)&cpu->ipc_buffer[0] = len; |
| 216 | cp1 = (char *) &cpu->ipc_buffer[1]; |
| 217 | memcpy(cp1, cp2, len); |
| 218 | |
| 219 | /* atomic test and set */ |
| 220 | wmb(); |
| 221 | set_bit(cpuid, &hwrpb->rxrdy); |
| 222 | |
| 223 | if (wait_for_txrdy(cpumask)) |
| 224 | goto timeout; |
| 225 | return; |
| 226 | |
| 227 | timeout: |
| 228 | printk("Processor %x not ready\n", cpuid); |
| 229 | } |
| 230 | |
| 231 | /* |
| 232 | * A secondary console wants to send a message. Receive it. |
| 233 | */ |
| 234 | static void |
| 235 | recv_secondary_console_msg(void) |
| 236 | { |
| 237 | int mycpu, i, cnt; |
| 238 | unsigned long txrdy = hwrpb->txrdy; |
| 239 | char *cp1, *cp2, buf[80]; |
| 240 | struct percpu_struct *cpu; |
| 241 | |
| 242 | DBGS(("recv_secondary_console_msg: TXRDY 0x%lx.\n", txrdy)); |
| 243 | |
| 244 | mycpu = hard_smp_processor_id(); |
| 245 | |
| 246 | for (i = 0; i < NR_CPUS; i++) { |
| 247 | if (!(txrdy & (1UL << i))) |
| 248 | continue; |
| 249 | |
| 250 | DBGS(("recv_secondary_console_msg: " |
| 251 | "TXRDY contains CPU %d.\n", i)); |
| 252 | |
| 253 | cpu = (struct percpu_struct *) |
| 254 | ((char*)hwrpb |
| 255 | + hwrpb->processor_offset |
| 256 | + i * hwrpb->processor_size); |
| 257 | |
| 258 | DBGS(("recv_secondary_console_msg: on %d from %d" |
| 259 | " HALT_REASON 0x%lx FLAGS 0x%lx\n", |
| 260 | mycpu, i, cpu->halt_reason, cpu->flags)); |
| 261 | |
| 262 | cnt = cpu->ipc_buffer[0] >> 32; |
| 263 | if (cnt <= 0 || cnt >= 80) |
| 264 | strcpy(buf, "<<< BOGUS MSG >>>"); |
| 265 | else { |
| 266 | cp1 = (char *) &cpu->ipc_buffer[11]; |
| 267 | cp2 = buf; |
| 268 | strcpy(cp2, cp1); |
| 269 | |
| 270 | while ((cp2 = strchr(cp2, '\r')) != 0) { |
| 271 | *cp2 = ' '; |
| 272 | if (cp2[1] == '\n') |
| 273 | cp2[1] = ' '; |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | DBGS((KERN_INFO "recv_secondary_console_msg: on %d " |
| 278 | "message is '%s'\n", mycpu, buf)); |
| 279 | } |
| 280 | |
| 281 | hwrpb->txrdy = 0; |
| 282 | } |
| 283 | |
| 284 | /* |
| 285 | * Convince the console to have a secondary cpu begin execution. |
| 286 | */ |
Al Viro | 7d6a8a1 | 2008-11-22 17:33:34 +0000 | [diff] [blame] | 287 | static int __cpuinit |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | secondary_cpu_start(int cpuid, struct task_struct *idle) |
| 289 | { |
| 290 | struct percpu_struct *cpu; |
| 291 | struct pcb_struct *hwpcb, *ipcb; |
| 292 | unsigned long timeout; |
| 293 | |
| 294 | cpu = (struct percpu_struct *) |
| 295 | ((char*)hwrpb |
| 296 | + hwrpb->processor_offset |
| 297 | + cpuid * hwrpb->processor_size); |
| 298 | hwpcb = (struct pcb_struct *) cpu->hwpcb; |
Al Viro | 37bfbaf | 2006-01-12 01:05:36 -0800 | [diff] [blame] | 299 | ipcb = &task_thread_info(idle)->pcb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | |
| 301 | /* Initialize the CPU's HWPCB to something just good enough for |
| 302 | us to get started. Immediately after starting, we'll swpctx |
| 303 | to the target idle task's pcb. Reuse the stack in the mean |
| 304 | time. Precalculate the target PCBB. */ |
| 305 | hwpcb->ksp = (unsigned long)ipcb + sizeof(union thread_union) - 16; |
| 306 | hwpcb->usp = 0; |
| 307 | hwpcb->ptbr = ipcb->ptbr; |
| 308 | hwpcb->pcc = 0; |
| 309 | hwpcb->asn = 0; |
| 310 | hwpcb->unique = virt_to_phys(ipcb); |
| 311 | hwpcb->flags = ipcb->flags; |
| 312 | hwpcb->res1 = hwpcb->res2 = 0; |
| 313 | |
| 314 | #if 0 |
| 315 | DBGS(("KSP 0x%lx PTBR 0x%lx VPTBR 0x%lx UNIQUE 0x%lx\n", |
| 316 | hwpcb->ksp, hwpcb->ptbr, hwrpb->vptb, hwpcb->unique)); |
| 317 | #endif |
| 318 | DBGS(("Starting secondary cpu %d: state 0x%lx pal_flags 0x%lx\n", |
| 319 | cpuid, idle->state, ipcb->flags)); |
| 320 | |
| 321 | /* Setup HWRPB fields that SRM uses to activate secondary CPU */ |
| 322 | hwrpb->CPU_restart = __smp_callin; |
| 323 | hwrpb->CPU_restart_data = (unsigned long) __smp_callin; |
| 324 | |
| 325 | /* Recalculate and update the HWRPB checksum */ |
| 326 | hwrpb_update_checksum(hwrpb); |
| 327 | |
| 328 | /* |
| 329 | * Send a "start" command to the specified processor. |
| 330 | */ |
| 331 | |
| 332 | /* SRM III 3.4.1.3 */ |
| 333 | cpu->flags |= 0x22; /* turn on Context Valid and Restart Capable */ |
| 334 | cpu->flags &= ~1; /* turn off Bootstrap In Progress */ |
| 335 | wmb(); |
| 336 | |
| 337 | send_secondary_console_msg("START\r\n", cpuid); |
| 338 | |
| 339 | /* Wait 10 seconds for an ACK from the console. */ |
| 340 | timeout = jiffies + 10*HZ; |
| 341 | while (time_before(jiffies, timeout)) { |
| 342 | if (cpu->flags & 1) |
| 343 | goto started; |
| 344 | udelay(10); |
| 345 | barrier(); |
| 346 | } |
| 347 | printk(KERN_ERR "SMP: Processor %d failed to start.\n", cpuid); |
| 348 | return -1; |
| 349 | |
| 350 | started: |
| 351 | DBGS(("secondary_cpu_start: SUCCESS for CPU %d!!!\n", cpuid)); |
| 352 | return 0; |
| 353 | } |
| 354 | |
| 355 | /* |
| 356 | * Bring one cpu online. |
| 357 | */ |
Al Viro | ed5f656 | 2007-07-26 17:34:19 +0100 | [diff] [blame] | 358 | static int __cpuinit |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | smp_boot_one_cpu(int cpuid) |
| 360 | { |
| 361 | struct task_struct *idle; |
| 362 | unsigned long timeout; |
| 363 | |
| 364 | /* Cook up an idler for this guy. Note that the address we |
| 365 | give to kernel_thread is irrelevant -- it's going to start |
| 366 | where HWRPB.CPU_restart says to start. But this gets all |
| 367 | the other task-y sort of data structures set up like we |
| 368 | wish. We can't use kernel_thread since we must avoid |
| 369 | rescheduling the child. */ |
| 370 | idle = fork_idle(cpuid); |
| 371 | if (IS_ERR(idle)) |
| 372 | panic("failed fork for CPU %d", cpuid); |
| 373 | |
| 374 | DBGS(("smp_boot_one_cpu: CPU %d state 0x%lx flags 0x%lx\n", |
| 375 | cpuid, idle->state, idle->flags)); |
| 376 | |
| 377 | /* Signal the secondary to wait a moment. */ |
| 378 | smp_secondary_alive = -1; |
| 379 | |
| 380 | /* Whirrr, whirrr, whirrrrrrrrr... */ |
| 381 | if (secondary_cpu_start(cpuid, idle)) |
| 382 | return -1; |
| 383 | |
| 384 | /* Notify the secondary CPU it can run calibrate_delay. */ |
| 385 | mb(); |
| 386 | smp_secondary_alive = 0; |
| 387 | |
| 388 | /* We've been acked by the console; wait one second for |
| 389 | the task to start up for real. */ |
| 390 | timeout = jiffies + 1*HZ; |
| 391 | while (time_before(jiffies, timeout)) { |
| 392 | if (smp_secondary_alive == 1) |
| 393 | goto alive; |
| 394 | udelay(10); |
| 395 | barrier(); |
| 396 | } |
| 397 | |
| 398 | /* We failed to boot the CPU. */ |
| 399 | |
| 400 | printk(KERN_ERR "SMP: Processor %d is stuck.\n", cpuid); |
| 401 | return -1; |
| 402 | |
| 403 | alive: |
| 404 | /* Another "Red Snapper". */ |
| 405 | return 0; |
| 406 | } |
| 407 | |
| 408 | /* |
| 409 | * Called from setup_arch. Detect an SMP system and which processors |
| 410 | * are present. |
| 411 | */ |
| 412 | void __init |
| 413 | setup_smp(void) |
| 414 | { |
| 415 | struct percpu_struct *cpubase, *cpu; |
| 416 | unsigned long i; |
| 417 | |
| 418 | if (boot_cpuid != 0) { |
| 419 | printk(KERN_WARNING "SMP: Booting off cpu %d instead of 0?\n", |
| 420 | boot_cpuid); |
| 421 | } |
| 422 | |
| 423 | if (hwrpb->nr_processors > 1) { |
| 424 | int boot_cpu_palrev; |
| 425 | |
| 426 | DBGS(("setup_smp: nr_processors %ld\n", |
| 427 | hwrpb->nr_processors)); |
| 428 | |
| 429 | cpubase = (struct percpu_struct *) |
| 430 | ((char*)hwrpb + hwrpb->processor_offset); |
| 431 | boot_cpu_palrev = cpubase->pal_revision; |
| 432 | |
| 433 | for (i = 0; i < hwrpb->nr_processors; i++) { |
| 434 | cpu = (struct percpu_struct *) |
| 435 | ((char *)cpubase + i*hwrpb->processor_size); |
| 436 | if ((cpu->flags & 0x1cc) == 0x1cc) { |
| 437 | smp_num_probed++; |
Rusty Russell | 98a79d6 | 2008-12-13 21:19:41 +1030 | [diff] [blame] | 438 | cpu_set(i, cpu_possible_map); |
Ivan Kokshaysky | c7d2d28 | 2006-06-04 02:51:34 -0700 | [diff] [blame] | 439 | cpu_set(i, cpu_present_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | cpu->pal_revision = boot_cpu_palrev; |
| 441 | } |
| 442 | |
| 443 | DBGS(("setup_smp: CPU %d: flags 0x%lx type 0x%lx\n", |
| 444 | i, cpu->flags, cpu->type)); |
| 445 | DBGS(("setup_smp: CPU %d: PAL rev 0x%lx\n", |
| 446 | i, cpu->pal_revision)); |
| 447 | } |
| 448 | } else { |
| 449 | smp_num_probed = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | |
Ivan Kokshaysky | c7d2d28 | 2006-06-04 02:51:34 -0700 | [diff] [blame] | 452 | printk(KERN_INFO "SMP: %d CPUs probed -- cpu_present_map = %lx\n", |
| 453 | smp_num_probed, cpu_present_map.bits[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | } |
| 455 | |
| 456 | /* |
| 457 | * Called by smp_init prepare the secondaries |
| 458 | */ |
| 459 | void __init |
| 460 | smp_prepare_cpus(unsigned int max_cpus) |
| 461 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | /* Take care of some initial bookkeeping. */ |
| 463 | memset(ipi_data, 0, sizeof(ipi_data)); |
| 464 | |
| 465 | current_thread_info()->cpu = boot_cpuid; |
| 466 | |
| 467 | smp_store_cpu_info(boot_cpuid); |
| 468 | smp_setup_percpu_timer(boot_cpuid); |
| 469 | |
| 470 | /* Nothing to do on a UP box, or when told not to. */ |
| 471 | if (smp_num_probed == 1 || max_cpus == 0) { |
Rusty Russell | 98a79d6 | 2008-12-13 21:19:41 +1030 | [diff] [blame] | 472 | cpu_possible_map = cpumask_of_cpu(boot_cpuid); |
Ivan Kokshaysky | c7d2d28 | 2006-06-04 02:51:34 -0700 | [diff] [blame] | 473 | cpu_present_map = cpumask_of_cpu(boot_cpuid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | printk(KERN_INFO "SMP mode deactivated.\n"); |
| 475 | return; |
| 476 | } |
| 477 | |
| 478 | printk(KERN_INFO "SMP starting up secondaries.\n"); |
| 479 | |
Ivan Kokshaysky | 328c2a8 | 2006-02-08 11:55:06 +0300 | [diff] [blame] | 480 | smp_num_cpus = smp_num_probed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | } |
| 482 | |
| 483 | void __devinit |
| 484 | smp_prepare_boot_cpu(void) |
| 485 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | } |
| 487 | |
Al Viro | ed5f656 | 2007-07-26 17:34:19 +0100 | [diff] [blame] | 488 | int __cpuinit |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | __cpu_up(unsigned int cpu) |
| 490 | { |
| 491 | smp_boot_one_cpu(cpu); |
| 492 | |
| 493 | return cpu_online(cpu) ? 0 : -ENOSYS; |
| 494 | } |
| 495 | |
| 496 | void __init |
| 497 | smp_cpus_done(unsigned int max_cpus) |
| 498 | { |
| 499 | int cpu; |
| 500 | unsigned long bogosum = 0; |
| 501 | |
| 502 | for(cpu = 0; cpu < NR_CPUS; cpu++) |
| 503 | if (cpu_online(cpu)) |
| 504 | bogosum += cpu_data[cpu].loops_per_jiffy; |
| 505 | |
| 506 | printk(KERN_INFO "SMP: Total of %d processors activated " |
| 507 | "(%lu.%02lu BogoMIPS).\n", |
| 508 | num_online_cpus(), |
| 509 | (bogosum + 2500) / (500000/HZ), |
| 510 | ((bogosum + 2500) / (5000/HZ)) % 100); |
| 511 | } |
| 512 | |
| 513 | |
| 514 | void |
| 515 | smp_percpu_timer_interrupt(struct pt_regs *regs) |
| 516 | { |
Al Viro | 8774cb8 | 2006-10-07 14:17:31 +0100 | [diff] [blame] | 517 | struct pt_regs *old_regs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | int cpu = smp_processor_id(); |
| 519 | unsigned long user = user_mode(regs); |
| 520 | struct cpuinfo_alpha *data = &cpu_data[cpu]; |
| 521 | |
Al Viro | 8774cb8 | 2006-10-07 14:17:31 +0100 | [diff] [blame] | 522 | old_regs = set_irq_regs(regs); |
| 523 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | /* Record kernel PC. */ |
Al Viro | 8774cb8 | 2006-10-07 14:17:31 +0100 | [diff] [blame] | 525 | profile_tick(CPU_PROFILING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | |
| 527 | if (!--data->prof_counter) { |
| 528 | /* We need to make like a normal interrupt -- otherwise |
| 529 | timer interrupts ignore the global interrupt lock, |
| 530 | which would be a Bad Thing. */ |
| 531 | irq_enter(); |
| 532 | |
| 533 | update_process_times(user); |
| 534 | |
| 535 | data->prof_counter = data->prof_multiplier; |
| 536 | |
| 537 | irq_exit(); |
| 538 | } |
Al Viro | 8774cb8 | 2006-10-07 14:17:31 +0100 | [diff] [blame] | 539 | set_irq_regs(old_regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | } |
| 541 | |
Al Viro | ed5f656 | 2007-07-26 17:34:19 +0100 | [diff] [blame] | 542 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | setup_profiling_timer(unsigned int multiplier) |
| 544 | { |
| 545 | return -EINVAL; |
| 546 | } |
| 547 | |
| 548 | |
| 549 | static void |
| 550 | send_ipi_message(cpumask_t to_whom, enum ipi_message_type operation) |
| 551 | { |
| 552 | int i; |
| 553 | |
| 554 | mb(); |
| 555 | for_each_cpu_mask(i, to_whom) |
| 556 | set_bit(operation, &ipi_data[i].bits); |
| 557 | |
| 558 | mb(); |
| 559 | for_each_cpu_mask(i, to_whom) |
| 560 | wripir(i); |
| 561 | } |
| 562 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | void |
| 564 | handle_ipi(struct pt_regs *regs) |
| 565 | { |
| 566 | int this_cpu = smp_processor_id(); |
| 567 | unsigned long *pending_ipis = &ipi_data[this_cpu].bits; |
| 568 | unsigned long ops; |
| 569 | |
| 570 | #if 0 |
| 571 | DBGS(("handle_ipi: on CPU %d ops 0x%lx PC 0x%lx\n", |
| 572 | this_cpu, *pending_ipis, regs->pc)); |
| 573 | #endif |
| 574 | |
| 575 | mb(); /* Order interrupt and bit testing. */ |
| 576 | while ((ops = xchg(pending_ipis, 0)) != 0) { |
| 577 | mb(); /* Order bit clearing and data access. */ |
| 578 | do { |
| 579 | unsigned long which; |
| 580 | |
| 581 | which = ops & -ops; |
| 582 | ops &= ~which; |
| 583 | which = __ffs(which); |
| 584 | |
| 585 | switch (which) { |
| 586 | case IPI_RESCHEDULE: |
| 587 | /* Reschedule callback. Everything to be done |
| 588 | is done by the interrupt return path. */ |
| 589 | break; |
| 590 | |
| 591 | case IPI_CALL_FUNC: |
Jens Axboe | c524a1d | 2008-06-10 20:47:29 +0200 | [diff] [blame] | 592 | generic_smp_call_function_interrupt(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | break; |
Jens Axboe | c524a1d | 2008-06-10 20:47:29 +0200 | [diff] [blame] | 594 | |
| 595 | case IPI_CALL_FUNC_SINGLE: |
| 596 | generic_smp_call_function_single_interrupt(); |
| 597 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | |
| 599 | case IPI_CPU_STOP: |
| 600 | halt(); |
| 601 | |
| 602 | default: |
| 603 | printk(KERN_CRIT "Unknown IPI on CPU %d: %lu\n", |
| 604 | this_cpu, which); |
| 605 | break; |
| 606 | } |
| 607 | } while (ops); |
| 608 | |
| 609 | mb(); /* Order data access and bit testing. */ |
| 610 | } |
| 611 | |
| 612 | cpu_data[this_cpu].ipi_count++; |
| 613 | |
| 614 | if (hwrpb->txrdy) |
| 615 | recv_secondary_console_msg(); |
| 616 | } |
| 617 | |
| 618 | void |
| 619 | smp_send_reschedule(int cpu) |
| 620 | { |
| 621 | #ifdef DEBUG_IPI_MSG |
| 622 | if (cpu == hard_smp_processor_id()) |
| 623 | printk(KERN_WARNING |
| 624 | "smp_send_reschedule: Sending IPI to self.\n"); |
| 625 | #endif |
| 626 | send_ipi_message(cpumask_of_cpu(cpu), IPI_RESCHEDULE); |
| 627 | } |
| 628 | |
| 629 | void |
| 630 | smp_send_stop(void) |
| 631 | { |
| 632 | cpumask_t to_whom = cpu_possible_map; |
| 633 | cpu_clear(smp_processor_id(), to_whom); |
| 634 | #ifdef DEBUG_IPI_MSG |
| 635 | if (hard_smp_processor_id() != boot_cpu_id) |
| 636 | printk(KERN_WARNING "smp_send_stop: Not on boot cpu.\n"); |
| 637 | #endif |
| 638 | send_ipi_message(to_whom, IPI_CPU_STOP); |
| 639 | } |
| 640 | |
Jens Axboe | c524a1d | 2008-06-10 20:47:29 +0200 | [diff] [blame] | 641 | void arch_send_call_function_ipi(cpumask_t mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | { |
Jens Axboe | c524a1d | 2008-06-10 20:47:29 +0200 | [diff] [blame] | 643 | send_ipi_message(mask, IPI_CALL_FUNC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | } |
| 645 | |
Jens Axboe | c524a1d | 2008-06-10 20:47:29 +0200 | [diff] [blame] | 646 | void arch_send_call_function_single_ipi(int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | { |
Jens Axboe | c524a1d | 2008-06-10 20:47:29 +0200 | [diff] [blame] | 648 | send_ipi_message(cpumask_of_cpu(cpu), IPI_CALL_FUNC_SINGLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | } |
| 650 | |
| 651 | static void |
| 652 | ipi_imb(void *ignored) |
| 653 | { |
| 654 | imb(); |
| 655 | } |
| 656 | |
| 657 | void |
| 658 | smp_imb(void) |
| 659 | { |
| 660 | /* Must wait other processors to flush their icache before continue. */ |
Jens Axboe | 15c8b6c | 2008-05-09 09:39:44 +0200 | [diff] [blame] | 661 | if (on_each_cpu(ipi_imb, NULL, 1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | printk(KERN_CRIT "smp_imb: timed out\n"); |
| 663 | } |
Al Viro | cff52da | 2006-10-11 17:40:22 +0100 | [diff] [blame] | 664 | EXPORT_SYMBOL(smp_imb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | |
| 666 | static void |
| 667 | ipi_flush_tlb_all(void *ignored) |
| 668 | { |
| 669 | tbia(); |
| 670 | } |
| 671 | |
| 672 | void |
| 673 | flush_tlb_all(void) |
| 674 | { |
| 675 | /* Although we don't have any data to pass, we do want to |
| 676 | synchronize with the other processors. */ |
Jens Axboe | 15c8b6c | 2008-05-09 09:39:44 +0200 | [diff] [blame] | 677 | if (on_each_cpu(ipi_flush_tlb_all, NULL, 1)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | printk(KERN_CRIT "flush_tlb_all: timed out\n"); |
| 679 | } |
| 680 | } |
| 681 | |
| 682 | #define asn_locked() (cpu_data[smp_processor_id()].asn_lock) |
| 683 | |
| 684 | static void |
| 685 | ipi_flush_tlb_mm(void *x) |
| 686 | { |
| 687 | struct mm_struct *mm = (struct mm_struct *) x; |
| 688 | if (mm == current->active_mm && !asn_locked()) |
| 689 | flush_tlb_current(mm); |
| 690 | else |
| 691 | flush_tlb_other(mm); |
| 692 | } |
| 693 | |
| 694 | void |
| 695 | flush_tlb_mm(struct mm_struct *mm) |
| 696 | { |
| 697 | preempt_disable(); |
| 698 | |
| 699 | if (mm == current->active_mm) { |
| 700 | flush_tlb_current(mm); |
| 701 | if (atomic_read(&mm->mm_users) <= 1) { |
| 702 | int cpu, this_cpu = smp_processor_id(); |
| 703 | for (cpu = 0; cpu < NR_CPUS; cpu++) { |
| 704 | if (!cpu_online(cpu) || cpu == this_cpu) |
| 705 | continue; |
| 706 | if (mm->context[cpu]) |
| 707 | mm->context[cpu] = 0; |
| 708 | } |
| 709 | preempt_enable(); |
| 710 | return; |
| 711 | } |
| 712 | } |
| 713 | |
Jens Axboe | 8691e5a | 2008-06-06 11:18:06 +0200 | [diff] [blame] | 714 | if (smp_call_function(ipi_flush_tlb_mm, mm, 1)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | printk(KERN_CRIT "flush_tlb_mm: timed out\n"); |
| 716 | } |
| 717 | |
| 718 | preempt_enable(); |
| 719 | } |
Al Viro | cff52da | 2006-10-11 17:40:22 +0100 | [diff] [blame] | 720 | EXPORT_SYMBOL(flush_tlb_mm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | |
| 722 | struct flush_tlb_page_struct { |
| 723 | struct vm_area_struct *vma; |
| 724 | struct mm_struct *mm; |
| 725 | unsigned long addr; |
| 726 | }; |
| 727 | |
| 728 | static void |
| 729 | ipi_flush_tlb_page(void *x) |
| 730 | { |
| 731 | struct flush_tlb_page_struct *data = (struct flush_tlb_page_struct *)x; |
| 732 | struct mm_struct * mm = data->mm; |
| 733 | |
| 734 | if (mm == current->active_mm && !asn_locked()) |
| 735 | flush_tlb_current_page(mm, data->vma, data->addr); |
| 736 | else |
| 737 | flush_tlb_other(mm); |
| 738 | } |
| 739 | |
| 740 | void |
| 741 | flush_tlb_page(struct vm_area_struct *vma, unsigned long addr) |
| 742 | { |
| 743 | struct flush_tlb_page_struct data; |
| 744 | struct mm_struct *mm = vma->vm_mm; |
| 745 | |
| 746 | preempt_disable(); |
| 747 | |
| 748 | if (mm == current->active_mm) { |
| 749 | flush_tlb_current_page(mm, vma, addr); |
| 750 | if (atomic_read(&mm->mm_users) <= 1) { |
| 751 | int cpu, this_cpu = smp_processor_id(); |
| 752 | for (cpu = 0; cpu < NR_CPUS; cpu++) { |
| 753 | if (!cpu_online(cpu) || cpu == this_cpu) |
| 754 | continue; |
| 755 | if (mm->context[cpu]) |
| 756 | mm->context[cpu] = 0; |
| 757 | } |
| 758 | preempt_enable(); |
| 759 | return; |
| 760 | } |
| 761 | } |
| 762 | |
| 763 | data.vma = vma; |
| 764 | data.mm = mm; |
| 765 | data.addr = addr; |
| 766 | |
Jens Axboe | 8691e5a | 2008-06-06 11:18:06 +0200 | [diff] [blame] | 767 | if (smp_call_function(ipi_flush_tlb_page, &data, 1)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | printk(KERN_CRIT "flush_tlb_page: timed out\n"); |
| 769 | } |
| 770 | |
| 771 | preempt_enable(); |
| 772 | } |
Al Viro | cff52da | 2006-10-11 17:40:22 +0100 | [diff] [blame] | 773 | EXPORT_SYMBOL(flush_tlb_page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | |
| 775 | void |
| 776 | flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) |
| 777 | { |
| 778 | /* On the Alpha we always flush the whole user tlb. */ |
| 779 | flush_tlb_mm(vma->vm_mm); |
| 780 | } |
Al Viro | cff52da | 2006-10-11 17:40:22 +0100 | [diff] [blame] | 781 | EXPORT_SYMBOL(flush_tlb_range); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | |
| 783 | static void |
| 784 | ipi_flush_icache_page(void *x) |
| 785 | { |
| 786 | struct mm_struct *mm = (struct mm_struct *) x; |
| 787 | if (mm == current->active_mm && !asn_locked()) |
| 788 | __load_new_mm_context(mm); |
| 789 | else |
| 790 | flush_tlb_other(mm); |
| 791 | } |
| 792 | |
| 793 | void |
| 794 | flush_icache_user_range(struct vm_area_struct *vma, struct page *page, |
| 795 | unsigned long addr, int len) |
| 796 | { |
| 797 | struct mm_struct *mm = vma->vm_mm; |
| 798 | |
| 799 | if ((vma->vm_flags & VM_EXEC) == 0) |
| 800 | return; |
| 801 | |
| 802 | preempt_disable(); |
| 803 | |
| 804 | if (mm == current->active_mm) { |
| 805 | __load_new_mm_context(mm); |
| 806 | if (atomic_read(&mm->mm_users) <= 1) { |
| 807 | int cpu, this_cpu = smp_processor_id(); |
| 808 | for (cpu = 0; cpu < NR_CPUS; cpu++) { |
| 809 | if (!cpu_online(cpu) || cpu == this_cpu) |
| 810 | continue; |
| 811 | if (mm->context[cpu]) |
| 812 | mm->context[cpu] = 0; |
| 813 | } |
| 814 | preempt_enable(); |
| 815 | return; |
| 816 | } |
| 817 | } |
| 818 | |
Jens Axboe | 8691e5a | 2008-06-06 11:18:06 +0200 | [diff] [blame] | 819 | if (smp_call_function(ipi_flush_icache_page, mm, 1)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | printk(KERN_CRIT "flush_icache_page: timed out\n"); |
| 821 | } |
| 822 | |
| 823 | preempt_enable(); |
| 824 | } |