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 David Mosberger-Tang <davidm@hpl.hp.com> |
| 6 | ** Copyright (C) 2001,2004 Grant Grundler <grundler@parisc-linux.org> |
| 7 | ** |
| 8 | ** Lots of stuff stolen from arch/alpha/kernel/smp.c |
| 9 | ** ...and then parisc stole from arch/ia64/kernel/smp.c. Thanks David! :^) |
| 10 | ** |
| 11 | ** Thanks to John Curry and Ullas Ponnadi. I learned alot from their work. |
| 12 | ** -grant (1/12/2001) |
| 13 | ** |
| 14 | ** This program is free software; you can redistribute it and/or modify |
| 15 | ** it under the terms of the GNU General Public License as published by |
| 16 | ** the Free Software Foundation; either version 2 of the License, or |
| 17 | ** (at your option) any later version. |
| 18 | */ |
| 19 | #undef ENTRY_SYS_CPUS /* syscall support for iCOD-like functionality */ |
| 20 | |
| 21 | #include <linux/autoconf.h> |
| 22 | |
| 23 | #include <linux/types.h> |
| 24 | #include <linux/spinlock.h> |
| 25 | #include <linux/slab.h> |
| 26 | |
| 27 | #include <linux/kernel.h> |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/sched.h> |
| 30 | #include <linux/init.h> |
| 31 | #include <linux/interrupt.h> |
| 32 | #include <linux/smp.h> |
| 33 | #include <linux/kernel_stat.h> |
| 34 | #include <linux/mm.h> |
| 35 | #include <linux/delay.h> |
| 36 | #include <linux/bitops.h> |
| 37 | |
| 38 | #include <asm/system.h> |
| 39 | #include <asm/atomic.h> |
| 40 | #include <asm/current.h> |
| 41 | #include <asm/delay.h> |
| 42 | #include <asm/pgalloc.h> /* for flush_tlb_all() proto/macro */ |
| 43 | |
| 44 | #include <asm/io.h> |
| 45 | #include <asm/irq.h> /* for CPU_IRQ_REGION and friends */ |
| 46 | #include <asm/mmu_context.h> |
| 47 | #include <asm/page.h> |
| 48 | #include <asm/pgtable.h> |
| 49 | #include <asm/pgalloc.h> |
| 50 | #include <asm/processor.h> |
| 51 | #include <asm/ptrace.h> |
| 52 | #include <asm/unistd.h> |
| 53 | #include <asm/cacheflush.h> |
| 54 | |
| 55 | #define kDEBUG 0 |
| 56 | |
| 57 | DEFINE_SPINLOCK(smp_lock); |
| 58 | |
| 59 | volatile struct task_struct *smp_init_current_idle_task; |
| 60 | |
| 61 | static volatile int cpu_now_booting = 0; /* track which CPU is booting */ |
| 62 | |
| 63 | static int parisc_max_cpus = 1; |
| 64 | |
| 65 | /* online cpus are ones that we've managed to bring up completely |
| 66 | * possible cpus are all valid cpu |
| 67 | * present cpus are all detected cpu |
| 68 | * |
| 69 | * On startup we bring up the "possible" cpus. Since we discover |
| 70 | * CPUs later, we add them as hotplug, so the possible cpu mask is |
| 71 | * empty in the beginning. |
| 72 | */ |
| 73 | |
| 74 | cpumask_t cpu_online_map = CPU_MASK_NONE; /* Bitmap of online CPUs */ |
| 75 | cpumask_t cpu_possible_map = CPU_MASK_ALL; /* Bitmap of Present CPUs */ |
| 76 | |
| 77 | EXPORT_SYMBOL(cpu_online_map); |
| 78 | EXPORT_SYMBOL(cpu_possible_map); |
| 79 | |
| 80 | |
| 81 | struct smp_call_struct { |
| 82 | void (*func) (void *info); |
| 83 | void *info; |
| 84 | long wait; |
| 85 | atomic_t unstarted_count; |
| 86 | atomic_t unfinished_count; |
| 87 | }; |
| 88 | static volatile struct smp_call_struct *smp_call_function_data; |
| 89 | |
| 90 | enum ipi_message_type { |
| 91 | IPI_NOP=0, |
| 92 | IPI_RESCHEDULE=1, |
| 93 | IPI_CALL_FUNC, |
| 94 | IPI_CPU_START, |
| 95 | IPI_CPU_STOP, |
| 96 | IPI_CPU_TEST |
| 97 | }; |
| 98 | |
| 99 | |
| 100 | /********** SMP inter processor interrupt and communication routines */ |
| 101 | |
| 102 | #undef PER_CPU_IRQ_REGION |
| 103 | #ifdef PER_CPU_IRQ_REGION |
| 104 | /* XXX REVISIT Ignore for now. |
| 105 | ** *May* need this "hook" to register IPI handler |
| 106 | ** once we have perCPU ExtIntr switch tables. |
| 107 | */ |
| 108 | static void |
| 109 | ipi_init(int cpuid) |
| 110 | { |
| 111 | |
| 112 | /* If CPU is present ... */ |
| 113 | #ifdef ENTRY_SYS_CPUS |
| 114 | /* *and* running (not stopped) ... */ |
| 115 | #error iCOD support wants state checked here. |
| 116 | #endif |
| 117 | |
| 118 | #error verify IRQ_OFFSET(IPI_IRQ) is ipi_interrupt() in new IRQ region |
| 119 | |
| 120 | if(cpu_online(cpuid) ) |
| 121 | { |
| 122 | switch_to_idle_task(current); |
| 123 | } |
| 124 | |
| 125 | return; |
| 126 | } |
| 127 | #endif |
| 128 | |
| 129 | |
| 130 | /* |
| 131 | ** Yoink this CPU from the runnable list... |
| 132 | ** |
| 133 | */ |
| 134 | static void |
| 135 | halt_processor(void) |
| 136 | { |
| 137 | #ifdef ENTRY_SYS_CPUS |
| 138 | #error halt_processor() needs rework |
| 139 | /* |
| 140 | ** o migrate I/O interrupts off this CPU. |
| 141 | ** o leave IPI enabled - __cli() will disable IPI. |
| 142 | ** o leave CPU in online map - just change the state |
| 143 | */ |
| 144 | cpu_data[this_cpu].state = STATE_STOPPED; |
| 145 | mark_bh(IPI_BH); |
| 146 | #else |
| 147 | /* REVISIT : redirect I/O Interrupts to another CPU? */ |
| 148 | /* REVISIT : does PM *know* this CPU isn't available? */ |
| 149 | cpu_clear(smp_processor_id(), cpu_online_map); |
| 150 | local_irq_disable(); |
| 151 | for (;;) |
| 152 | ; |
| 153 | #endif |
| 154 | } |
| 155 | |
| 156 | |
| 157 | irqreturn_t |
| 158 | ipi_interrupt(int irq, void *dev_id, struct pt_regs *regs) |
| 159 | { |
| 160 | int this_cpu = smp_processor_id(); |
| 161 | struct cpuinfo_parisc *p = &cpu_data[this_cpu]; |
| 162 | unsigned long ops; |
| 163 | unsigned long flags; |
| 164 | |
| 165 | /* Count this now; we may make a call that never returns. */ |
| 166 | p->ipi_count++; |
| 167 | |
| 168 | mb(); /* Order interrupt and bit testing. */ |
| 169 | |
| 170 | for (;;) { |
| 171 | spin_lock_irqsave(&(p->lock),flags); |
| 172 | ops = p->pending_ipi; |
| 173 | p->pending_ipi = 0; |
| 174 | spin_unlock_irqrestore(&(p->lock),flags); |
| 175 | |
| 176 | mb(); /* Order bit clearing and data access. */ |
| 177 | |
| 178 | if (!ops) |
| 179 | break; |
| 180 | |
| 181 | while (ops) { |
| 182 | unsigned long which = ffz(~ops); |
| 183 | |
| 184 | switch (which) { |
| 185 | case IPI_RESCHEDULE: |
| 186 | #if (kDEBUG>=100) |
| 187 | printk(KERN_DEBUG "CPU%d IPI_RESCHEDULE\n",this_cpu); |
| 188 | #endif /* kDEBUG */ |
| 189 | ops &= ~(1 << IPI_RESCHEDULE); |
| 190 | /* |
| 191 | * Reschedule callback. Everything to be |
| 192 | * done is done by the interrupt return path. |
| 193 | */ |
| 194 | break; |
| 195 | |
| 196 | case IPI_CALL_FUNC: |
| 197 | #if (kDEBUG>=100) |
| 198 | printk(KERN_DEBUG "CPU%d IPI_CALL_FUNC\n",this_cpu); |
| 199 | #endif /* kDEBUG */ |
| 200 | ops &= ~(1 << IPI_CALL_FUNC); |
| 201 | { |
| 202 | volatile struct smp_call_struct *data; |
| 203 | void (*func)(void *info); |
| 204 | void *info; |
| 205 | int wait; |
| 206 | |
| 207 | data = smp_call_function_data; |
| 208 | func = data->func; |
| 209 | info = data->info; |
| 210 | wait = data->wait; |
| 211 | |
| 212 | mb(); |
| 213 | atomic_dec ((atomic_t *)&data->unstarted_count); |
| 214 | |
| 215 | /* At this point, *data can't |
| 216 | * be relied upon. |
| 217 | */ |
| 218 | |
| 219 | (*func)(info); |
| 220 | |
| 221 | /* Notify the sending CPU that the |
| 222 | * task is done. |
| 223 | */ |
| 224 | mb(); |
| 225 | if (wait) |
| 226 | atomic_dec ((atomic_t *)&data->unfinished_count); |
| 227 | } |
| 228 | break; |
| 229 | |
| 230 | case IPI_CPU_START: |
| 231 | #if (kDEBUG>=100) |
| 232 | printk(KERN_DEBUG "CPU%d IPI_CPU_START\n",this_cpu); |
| 233 | #endif /* kDEBUG */ |
| 234 | ops &= ~(1 << IPI_CPU_START); |
| 235 | #ifdef ENTRY_SYS_CPUS |
| 236 | p->state = STATE_RUNNING; |
| 237 | #endif |
| 238 | break; |
| 239 | |
| 240 | case IPI_CPU_STOP: |
| 241 | #if (kDEBUG>=100) |
| 242 | printk(KERN_DEBUG "CPU%d IPI_CPU_STOP\n",this_cpu); |
| 243 | #endif /* kDEBUG */ |
| 244 | ops &= ~(1 << IPI_CPU_STOP); |
| 245 | #ifdef ENTRY_SYS_CPUS |
| 246 | #else |
| 247 | halt_processor(); |
| 248 | #endif |
| 249 | break; |
| 250 | |
| 251 | case IPI_CPU_TEST: |
| 252 | #if (kDEBUG>=100) |
| 253 | printk(KERN_DEBUG "CPU%d is alive!\n",this_cpu); |
| 254 | #endif /* kDEBUG */ |
| 255 | ops &= ~(1 << IPI_CPU_TEST); |
| 256 | break; |
| 257 | |
| 258 | default: |
| 259 | printk(KERN_CRIT "Unknown IPI num on CPU%d: %lu\n", |
| 260 | this_cpu, which); |
| 261 | ops &= ~(1 << which); |
| 262 | return IRQ_NONE; |
| 263 | } /* Switch */ |
| 264 | } /* while (ops) */ |
| 265 | } |
| 266 | return IRQ_HANDLED; |
| 267 | } |
| 268 | |
| 269 | |
| 270 | static inline void |
| 271 | ipi_send(int cpu, enum ipi_message_type op) |
| 272 | { |
| 273 | struct cpuinfo_parisc *p = &cpu_data[cpu]; |
| 274 | unsigned long flags; |
| 275 | |
| 276 | spin_lock_irqsave(&(p->lock),flags); |
| 277 | p->pending_ipi |= 1 << op; |
| 278 | gsc_writel(IPI_IRQ - CPU_IRQ_BASE, cpu_data[cpu].hpa); |
| 279 | spin_unlock_irqrestore(&(p->lock),flags); |
| 280 | } |
| 281 | |
| 282 | |
| 283 | static inline void |
| 284 | send_IPI_single(int dest_cpu, enum ipi_message_type op) |
| 285 | { |
| 286 | if (dest_cpu == NO_PROC_ID) { |
| 287 | BUG(); |
| 288 | return; |
| 289 | } |
| 290 | |
| 291 | ipi_send(dest_cpu, op); |
| 292 | } |
| 293 | |
| 294 | static inline void |
| 295 | send_IPI_allbutself(enum ipi_message_type op) |
| 296 | { |
| 297 | int i; |
| 298 | |
| 299 | for (i = 0; i < NR_CPUS; i++) { |
| 300 | if (cpu_online(i) && i != smp_processor_id()) |
| 301 | send_IPI_single(i, op); |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | |
| 306 | inline void |
| 307 | smp_send_stop(void) { send_IPI_allbutself(IPI_CPU_STOP); } |
| 308 | |
| 309 | static inline void |
| 310 | smp_send_start(void) { send_IPI_allbutself(IPI_CPU_START); } |
| 311 | |
| 312 | void |
| 313 | smp_send_reschedule(int cpu) { send_IPI_single(cpu, IPI_RESCHEDULE); } |
| 314 | |
| 315 | |
| 316 | /** |
| 317 | * Run a function on all other CPUs. |
| 318 | * <func> The function to run. This must be fast and non-blocking. |
| 319 | * <info> An arbitrary pointer to pass to the function. |
| 320 | * <retry> If true, keep retrying until ready. |
| 321 | * <wait> If true, wait until function has completed on other CPUs. |
| 322 | * [RETURNS] 0 on success, else a negative status code. |
| 323 | * |
| 324 | * Does not return until remote CPUs are nearly ready to execute <func> |
| 325 | * or have executed. |
| 326 | */ |
| 327 | |
| 328 | int |
| 329 | smp_call_function (void (*func) (void *info), void *info, int retry, int wait) |
| 330 | { |
| 331 | struct smp_call_struct data; |
| 332 | unsigned long timeout; |
| 333 | static DEFINE_SPINLOCK(lock); |
| 334 | int retries = 0; |
| 335 | |
| 336 | if (num_online_cpus() < 2) |
| 337 | return 0; |
| 338 | |
| 339 | /* Can deadlock when called with interrupts disabled */ |
| 340 | WARN_ON(irqs_disabled()); |
| 341 | |
| 342 | data.func = func; |
| 343 | data.info = info; |
| 344 | data.wait = wait; |
| 345 | atomic_set(&data.unstarted_count, num_online_cpus() - 1); |
| 346 | atomic_set(&data.unfinished_count, num_online_cpus() - 1); |
| 347 | |
| 348 | if (retry) { |
| 349 | spin_lock (&lock); |
| 350 | while (smp_call_function_data != 0) |
| 351 | barrier(); |
| 352 | } |
| 353 | else { |
| 354 | spin_lock (&lock); |
| 355 | if (smp_call_function_data) { |
| 356 | spin_unlock (&lock); |
| 357 | return -EBUSY; |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | smp_call_function_data = &data; |
| 362 | spin_unlock (&lock); |
| 363 | |
| 364 | /* Send a message to all other CPUs and wait for them to respond */ |
| 365 | send_IPI_allbutself(IPI_CALL_FUNC); |
| 366 | |
| 367 | retry: |
| 368 | /* Wait for response */ |
| 369 | timeout = jiffies + HZ; |
| 370 | while ( (atomic_read (&data.unstarted_count) > 0) && |
| 371 | time_before (jiffies, timeout) ) |
| 372 | barrier (); |
| 373 | |
| 374 | if (atomic_read (&data.unstarted_count) > 0) { |
| 375 | printk(KERN_CRIT "SMP CALL FUNCTION TIMED OUT! (cpu=%d), try %d\n", |
| 376 | smp_processor_id(), ++retries); |
| 377 | goto retry; |
| 378 | } |
| 379 | /* We either got one or timed out. Release the lock */ |
| 380 | |
| 381 | mb(); |
| 382 | smp_call_function_data = NULL; |
| 383 | |
| 384 | while (wait && atomic_read (&data.unfinished_count) > 0) |
| 385 | barrier (); |
| 386 | |
| 387 | return 0; |
| 388 | } |
| 389 | |
| 390 | EXPORT_SYMBOL(smp_call_function); |
| 391 | |
| 392 | /* |
| 393 | * Flush all other CPU's tlb and then mine. Do this with on_each_cpu() |
| 394 | * as we want to ensure all TLB's flushed before proceeding. |
| 395 | */ |
| 396 | |
| 397 | extern void flush_tlb_all_local(void); |
| 398 | |
| 399 | void |
| 400 | smp_flush_tlb_all(void) |
| 401 | { |
| 402 | on_each_cpu((void (*)(void *))flush_tlb_all_local, NULL, 1, 1); |
| 403 | } |
| 404 | |
| 405 | |
| 406 | void |
| 407 | smp_do_timer(struct pt_regs *regs) |
| 408 | { |
| 409 | int cpu = smp_processor_id(); |
| 410 | struct cpuinfo_parisc *data = &cpu_data[cpu]; |
| 411 | |
| 412 | if (!--data->prof_counter) { |
| 413 | data->prof_counter = data->prof_multiplier; |
| 414 | update_process_times(user_mode(regs)); |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | /* |
| 419 | * Called by secondaries to update state and initialize CPU registers. |
| 420 | */ |
| 421 | static void __init |
| 422 | smp_cpu_init(int cpunum) |
| 423 | { |
| 424 | extern int init_per_cpu(int); /* arch/parisc/kernel/setup.c */ |
| 425 | extern void init_IRQ(void); /* arch/parisc/kernel/irq.c */ |
| 426 | |
| 427 | /* Set modes and Enable floating point coprocessor */ |
| 428 | (void) init_per_cpu(cpunum); |
| 429 | |
| 430 | disable_sr_hashing(); |
| 431 | |
| 432 | mb(); |
| 433 | |
| 434 | /* Well, support 2.4 linux scheme as well. */ |
| 435 | if (cpu_test_and_set(cpunum, cpu_online_map)) |
| 436 | { |
| 437 | extern void machine_halt(void); /* arch/parisc.../process.c */ |
| 438 | |
| 439 | printk(KERN_CRIT "CPU#%d already initialized!\n", cpunum); |
| 440 | machine_halt(); |
| 441 | } |
| 442 | |
| 443 | /* Initialise the idle task for this CPU */ |
| 444 | atomic_inc(&init_mm.mm_count); |
| 445 | current->active_mm = &init_mm; |
| 446 | if(current->mm) |
| 447 | BUG(); |
| 448 | enter_lazy_tlb(&init_mm, current); |
| 449 | |
| 450 | init_IRQ(); /* make sure no IRQ's are enabled or pending */ |
| 451 | } |
| 452 | |
| 453 | |
| 454 | /* |
| 455 | * Slaves start using C here. Indirectly called from smp_slave_stext. |
| 456 | * Do what start_kernel() and main() do for boot strap processor (aka monarch) |
| 457 | */ |
| 458 | void __init smp_callin(void) |
| 459 | { |
| 460 | int slave_id = cpu_now_booting; |
| 461 | #if 0 |
| 462 | void *istack; |
| 463 | #endif |
| 464 | |
| 465 | smp_cpu_init(slave_id); |
| 466 | |
| 467 | #if 0 /* NOT WORKING YET - see entry.S */ |
| 468 | istack = (void *)__get_free_pages(GFP_KERNEL,ISTACK_ORDER); |
| 469 | if (istack == NULL) { |
| 470 | printk(KERN_CRIT "Failed to allocate interrupt stack for cpu %d\n",slave_id); |
| 471 | BUG(); |
| 472 | } |
| 473 | mtctl(istack,31); |
| 474 | #endif |
| 475 | |
| 476 | flush_cache_all_local(); /* start with known state */ |
| 477 | flush_tlb_all_local(); |
| 478 | |
| 479 | local_irq_enable(); /* Interrupts have been off until now */ |
| 480 | |
| 481 | cpu_idle(); /* Wait for timer to schedule some work */ |
| 482 | |
| 483 | /* NOTREACHED */ |
| 484 | panic("smp_callin() AAAAaaaaahhhh....\n"); |
| 485 | } |
| 486 | |
| 487 | /* |
| 488 | * Bring one cpu online. |
| 489 | */ |
| 490 | int __init smp_boot_one_cpu(int cpuid) |
| 491 | { |
| 492 | struct task_struct *idle; |
| 493 | long timeout; |
| 494 | |
| 495 | /* |
| 496 | * Create an idle task for this CPU. Note the address wed* give |
| 497 | * to kernel_thread is irrelevant -- it's going to start |
| 498 | * where OS_BOOT_RENDEVZ vector in SAL says to start. But |
| 499 | * this gets all the other task-y sort of data structures set |
| 500 | * up like we wish. We need to pull the just created idle task |
| 501 | * off the run queue and stuff it into the init_tasks[] array. |
| 502 | * Sheesh . . . |
| 503 | */ |
| 504 | |
| 505 | idle = fork_idle(cpuid); |
| 506 | if (IS_ERR(idle)) |
| 507 | panic("SMP: fork failed for CPU:%d", cpuid); |
| 508 | |
| 509 | idle->thread_info->cpu = cpuid; |
| 510 | |
| 511 | /* Let _start know what logical CPU we're booting |
| 512 | ** (offset into init_tasks[],cpu_data[]) |
| 513 | */ |
| 514 | cpu_now_booting = cpuid; |
| 515 | |
| 516 | /* |
| 517 | ** boot strap code needs to know the task address since |
| 518 | ** it also contains the process stack. |
| 519 | */ |
| 520 | smp_init_current_idle_task = idle ; |
| 521 | mb(); |
| 522 | |
| 523 | printk("Releasing cpu %d now, hpa=%lx\n", cpuid, cpu_data[cpuid].hpa); |
| 524 | |
| 525 | /* |
| 526 | ** This gets PDC to release the CPU from a very tight loop. |
| 527 | ** |
| 528 | ** From the PA-RISC 2.0 Firmware Architecture Reference Specification: |
| 529 | ** "The MEM_RENDEZ vector specifies the location of OS_RENDEZ which |
| 530 | ** is executed after receiving the rendezvous signal (an interrupt to |
| 531 | ** EIR{0}). MEM_RENDEZ is valid only when it is nonzero and the |
| 532 | ** contents of memory are valid." |
| 533 | */ |
| 534 | gsc_writel(TIMER_IRQ - CPU_IRQ_BASE, cpu_data[cpuid].hpa); |
| 535 | mb(); |
| 536 | |
| 537 | /* |
| 538 | * OK, wait a bit for that CPU to finish staggering about. |
| 539 | * Slave will set a bit when it reaches smp_cpu_init(). |
| 540 | * Once the "monarch CPU" sees the bit change, it can move on. |
| 541 | */ |
| 542 | for (timeout = 0; timeout < 10000; timeout++) { |
| 543 | if(cpu_online(cpuid)) { |
| 544 | /* Which implies Slave has started up */ |
| 545 | cpu_now_booting = 0; |
| 546 | smp_init_current_idle_task = NULL; |
| 547 | goto alive ; |
| 548 | } |
| 549 | udelay(100); |
| 550 | barrier(); |
| 551 | } |
| 552 | |
| 553 | put_task_struct(idle); |
| 554 | idle = NULL; |
| 555 | |
| 556 | printk(KERN_CRIT "SMP: CPU:%d is stuck.\n", cpuid); |
| 557 | return -1; |
| 558 | |
| 559 | alive: |
| 560 | /* Remember the Slave data */ |
| 561 | #if (kDEBUG>=100) |
| 562 | printk(KERN_DEBUG "SMP: CPU:%d came alive after %ld _us\n", |
| 563 | cpuid, timeout * 100); |
| 564 | #endif /* kDEBUG */ |
| 565 | #ifdef ENTRY_SYS_CPUS |
| 566 | cpu_data[cpuid].state = STATE_RUNNING; |
| 567 | #endif |
| 568 | return 0; |
| 569 | } |
| 570 | |
| 571 | void __devinit smp_prepare_boot_cpu(void) |
| 572 | { |
| 573 | int bootstrap_processor=cpu_data[0].cpuid; /* CPU ID of BSP */ |
| 574 | |
| 575 | #ifdef ENTRY_SYS_CPUS |
| 576 | cpu_data[0].state = STATE_RUNNING; |
| 577 | #endif |
| 578 | |
| 579 | /* Setup BSP mappings */ |
| 580 | printk("SMP: bootstrap CPU ID is %d\n",bootstrap_processor); |
| 581 | |
| 582 | cpu_set(bootstrap_processor, cpu_online_map); |
| 583 | cpu_set(bootstrap_processor, cpu_present_map); |
| 584 | } |
| 585 | |
| 586 | |
| 587 | |
| 588 | /* |
| 589 | ** inventory.c:do_inventory() hasn't yet been run and thus we |
| 590 | ** don't 'discover' the additional CPU's until later. |
| 591 | */ |
| 592 | void __init smp_prepare_cpus(unsigned int max_cpus) |
| 593 | { |
| 594 | cpus_clear(cpu_present_map); |
| 595 | cpu_set(0, cpu_present_map); |
| 596 | |
| 597 | parisc_max_cpus = max_cpus; |
| 598 | if (!max_cpus) |
| 599 | printk(KERN_INFO "SMP mode deactivated.\n"); |
| 600 | } |
| 601 | |
| 602 | |
| 603 | void smp_cpus_done(unsigned int cpu_max) |
| 604 | { |
| 605 | return; |
| 606 | } |
| 607 | |
| 608 | |
| 609 | int __devinit __cpu_up(unsigned int cpu) |
| 610 | { |
| 611 | if (cpu != 0 && cpu < parisc_max_cpus) |
| 612 | smp_boot_one_cpu(cpu); |
| 613 | |
| 614 | return cpu_online(cpu) ? 0 : -ENOSYS; |
| 615 | } |
| 616 | |
| 617 | |
| 618 | |
| 619 | #ifdef ENTRY_SYS_CPUS |
| 620 | /* Code goes along with: |
| 621 | ** entry.s: ENTRY_NAME(sys_cpus) / * 215, for cpu stat * / |
| 622 | */ |
| 623 | int sys_cpus(int argc, char **argv) |
| 624 | { |
| 625 | int i,j=0; |
| 626 | extern int current_pid(int cpu); |
| 627 | |
| 628 | if( argc > 2 ) { |
| 629 | printk("sys_cpus:Only one argument supported\n"); |
| 630 | return (-1); |
| 631 | } |
| 632 | if ( argc == 1 ){ |
| 633 | |
| 634 | #ifdef DUMP_MORE_STATE |
| 635 | for(i=0; i<NR_CPUS; i++) { |
| 636 | int cpus_per_line = 4; |
| 637 | if(cpu_online(i)) { |
| 638 | if (j++ % cpus_per_line) |
| 639 | printk(" %3d",i); |
| 640 | else |
| 641 | printk("\n %3d",i); |
| 642 | } |
| 643 | } |
| 644 | printk("\n"); |
| 645 | #else |
| 646 | printk("\n 0\n"); |
| 647 | #endif |
| 648 | } else if((argc==2) && !(strcmp(argv[1],"-l"))) { |
| 649 | printk("\nCPUSTATE TASK CPUNUM CPUID HARDCPU(HPA)\n"); |
| 650 | #ifdef DUMP_MORE_STATE |
| 651 | for(i=0;i<NR_CPUS;i++) { |
| 652 | if (!cpu_online(i)) |
| 653 | continue; |
| 654 | if (cpu_data[i].cpuid != NO_PROC_ID) { |
| 655 | switch(cpu_data[i].state) { |
| 656 | case STATE_RENDEZVOUS: |
| 657 | printk("RENDEZVS "); |
| 658 | break; |
| 659 | case STATE_RUNNING: |
| 660 | printk((current_pid(i)!=0) ? "RUNNING " : "IDLING "); |
| 661 | break; |
| 662 | case STATE_STOPPED: |
| 663 | printk("STOPPED "); |
| 664 | break; |
| 665 | case STATE_HALTED: |
| 666 | printk("HALTED "); |
| 667 | break; |
| 668 | default: |
| 669 | printk("%08x?", cpu_data[i].state); |
| 670 | break; |
| 671 | } |
| 672 | if(cpu_online(i)) { |
| 673 | printk(" %4d",current_pid(i)); |
| 674 | } |
| 675 | printk(" %6d",cpu_number_map(i)); |
| 676 | printk(" %5d",i); |
| 677 | printk(" 0x%lx\n",cpu_data[i].hpa); |
| 678 | } |
| 679 | } |
| 680 | #else |
| 681 | printk("\n%s %4d 0 0 --------", |
| 682 | (current->pid)?"RUNNING ": "IDLING ",current->pid); |
| 683 | #endif |
| 684 | } else if ((argc==2) && !(strcmp(argv[1],"-s"))) { |
| 685 | #ifdef DUMP_MORE_STATE |
| 686 | printk("\nCPUSTATE CPUID\n"); |
| 687 | for (i=0;i<NR_CPUS;i++) { |
| 688 | if (!cpu_online(i)) |
| 689 | continue; |
| 690 | if (cpu_data[i].cpuid != NO_PROC_ID) { |
| 691 | switch(cpu_data[i].state) { |
| 692 | case STATE_RENDEZVOUS: |
| 693 | printk("RENDEZVS");break; |
| 694 | case STATE_RUNNING: |
| 695 | printk((current_pid(i)!=0) ? "RUNNING " : "IDLING"); |
| 696 | break; |
| 697 | case STATE_STOPPED: |
| 698 | printk("STOPPED ");break; |
| 699 | case STATE_HALTED: |
| 700 | printk("HALTED ");break; |
| 701 | default: |
| 702 | } |
| 703 | printk(" %5d\n",i); |
| 704 | } |
| 705 | } |
| 706 | #else |
| 707 | printk("\n%s CPU0",(current->pid==0)?"RUNNING ":"IDLING "); |
| 708 | #endif |
| 709 | } else { |
| 710 | printk("sys_cpus:Unknown request\n"); |
| 711 | return (-1); |
| 712 | } |
| 713 | return 0; |
| 714 | } |
| 715 | #endif /* ENTRY_SYS_CPUS */ |
| 716 | |
| 717 | #ifdef CONFIG_PROC_FS |
| 718 | int __init |
| 719 | setup_profiling_timer(unsigned int multiplier) |
| 720 | { |
| 721 | return -EINVAL; |
| 722 | } |
| 723 | #endif |