Commit | Line | Data |
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1da177e4 LT |
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> | |
4e950f6f | 19 | #include <linux/err.h> |
1da177e4 LT |
20 | #include <linux/threads.h> |
21 | #include <linux/smp.h> | |
1da177e4 LT |
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> | |
574f34ce | 30 | #include <linux/cpu.h> |
1da177e4 LT |
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]; | |
cff52daf | 56 | EXPORT_SYMBOL(cpu_data); |
1da177e4 LT |
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, | |
c524a1d8 | 66 | IPI_CALL_FUNC_SINGLE, |
1da177e4 LT |
67 | IPI_CPU_STOP, |
68 | }; | |
69 | ||
70 | /* Set to a secondary's cpuid when it comes online. */ | |
cc040a8a | 71 | static int smp_secondary_alive __devinitdata = 0; |
1da177e4 | 72 | |
1da177e4 LT |
73 | int smp_num_probed; /* Internal processor count */ |
74 | int smp_num_cpus = 1; /* Number that came online. */ | |
cff52daf | 75 | EXPORT_SYMBOL(smp_num_cpus); |
1da177e4 | 76 | |
1da177e4 LT |
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 | */ | |
7d6a8a1c | 119 | void __cpuinit |
1da177e4 LT |
120 | smp_callin(void) |
121 | { | |
122 | int cpuid = hard_smp_processor_id(); | |
123 | ||
1371be0f | 124 | if (cpu_online(cpuid)) { |
1da177e4 LT |
125 | printk("??, cpu 0x%x already present??\n", cpuid); |
126 | BUG(); | |
127 | } | |
1371be0f | 128 | set_cpu_online(cpuid, true); |
1da177e4 LT |
129 | |
130 | /* Turn on machine checks. */ | |
131 | wrmces(7); | |
132 | ||
133 | /* Set trap vectors. */ | |
134 | trap_init(); | |
135 | ||
136 | /* Set interrupt vector. */ | |
137 | wrent(entInt, 0); | |
138 | ||
139 | /* Get our local ticker going. */ | |
140 | smp_setup_percpu_timer(cpuid); | |
141 | ||
142 | /* Call platform-specific callin, if specified */ | |
143 | if (alpha_mv.smp_callin) alpha_mv.smp_callin(); | |
144 | ||
145 | /* All kernel threads share the same mm context. */ | |
146 | atomic_inc(&init_mm.mm_count); | |
147 | current->active_mm = &init_mm; | |
148 | ||
e545a614 MS |
149 | /* inform the notifiers about the new cpu */ |
150 | notify_cpu_starting(cpuid); | |
151 | ||
1da177e4 LT |
152 | /* Must have completely accurate bogos. */ |
153 | local_irq_enable(); | |
154 | ||
155 | /* Wait boot CPU to stop with irq enabled before running | |
156 | calibrate_delay. */ | |
157 | wait_boot_cpu_to_stop(cpuid); | |
158 | mb(); | |
159 | calibrate_delay(); | |
160 | ||
161 | smp_store_cpu_info(cpuid); | |
162 | /* Allow master to continue only after we written loops_per_jiffy. */ | |
163 | wmb(); | |
164 | smp_secondary_alive = 1; | |
165 | ||
166 | DBGS(("smp_callin: commencing CPU %d current %p active_mm %p\n", | |
167 | cpuid, current, current->active_mm)); | |
168 | ||
169 | /* Do nothing. */ | |
170 | cpu_idle(); | |
171 | } | |
172 | ||
173 | /* Wait until hwrpb->txrdy is clear for cpu. Return -1 on timeout. */ | |
cc040a8a | 174 | static int __devinit |
1da177e4 LT |
175 | wait_for_txrdy (unsigned long cpumask) |
176 | { | |
177 | unsigned long timeout; | |
178 | ||
179 | if (!(hwrpb->txrdy & cpumask)) | |
180 | return 0; | |
181 | ||
182 | timeout = jiffies + 10*HZ; | |
183 | while (time_before(jiffies, timeout)) { | |
184 | if (!(hwrpb->txrdy & cpumask)) | |
185 | return 0; | |
186 | udelay(10); | |
187 | barrier(); | |
188 | } | |
189 | ||
190 | return -1; | |
191 | } | |
192 | ||
193 | /* | |
194 | * Send a message to a secondary's console. "START" is one such | |
195 | * interesting message. ;-) | |
196 | */ | |
7d6a8a1c | 197 | static void __cpuinit |
1da177e4 LT |
198 | send_secondary_console_msg(char *str, int cpuid) |
199 | { | |
200 | struct percpu_struct *cpu; | |
201 | register char *cp1, *cp2; | |
202 | unsigned long cpumask; | |
203 | size_t len; | |
204 | ||
205 | cpu = (struct percpu_struct *) | |
206 | ((char*)hwrpb | |
207 | + hwrpb->processor_offset | |
208 | + cpuid * hwrpb->processor_size); | |
209 | ||
210 | cpumask = (1UL << cpuid); | |
211 | if (wait_for_txrdy(cpumask)) | |
212 | goto timeout; | |
213 | ||
214 | cp2 = str; | |
215 | len = strlen(cp2); | |
216 | *(unsigned int *)&cpu->ipc_buffer[0] = len; | |
217 | cp1 = (char *) &cpu->ipc_buffer[1]; | |
218 | memcpy(cp1, cp2, len); | |
219 | ||
220 | /* atomic test and set */ | |
221 | wmb(); | |
222 | set_bit(cpuid, &hwrpb->rxrdy); | |
223 | ||
224 | if (wait_for_txrdy(cpumask)) | |
225 | goto timeout; | |
226 | return; | |
227 | ||
228 | timeout: | |
229 | printk("Processor %x not ready\n", cpuid); | |
230 | } | |
231 | ||
232 | /* | |
233 | * A secondary console wants to send a message. Receive it. | |
234 | */ | |
235 | static void | |
236 | recv_secondary_console_msg(void) | |
237 | { | |
238 | int mycpu, i, cnt; | |
239 | unsigned long txrdy = hwrpb->txrdy; | |
240 | char *cp1, *cp2, buf[80]; | |
241 | struct percpu_struct *cpu; | |
242 | ||
243 | DBGS(("recv_secondary_console_msg: TXRDY 0x%lx.\n", txrdy)); | |
244 | ||
245 | mycpu = hard_smp_processor_id(); | |
246 | ||
247 | for (i = 0; i < NR_CPUS; i++) { | |
248 | if (!(txrdy & (1UL << i))) | |
249 | continue; | |
250 | ||
251 | DBGS(("recv_secondary_console_msg: " | |
252 | "TXRDY contains CPU %d.\n", i)); | |
253 | ||
254 | cpu = (struct percpu_struct *) | |
255 | ((char*)hwrpb | |
256 | + hwrpb->processor_offset | |
257 | + i * hwrpb->processor_size); | |
258 | ||
259 | DBGS(("recv_secondary_console_msg: on %d from %d" | |
260 | " HALT_REASON 0x%lx FLAGS 0x%lx\n", | |
261 | mycpu, i, cpu->halt_reason, cpu->flags)); | |
262 | ||
263 | cnt = cpu->ipc_buffer[0] >> 32; | |
264 | if (cnt <= 0 || cnt >= 80) | |
265 | strcpy(buf, "<<< BOGUS MSG >>>"); | |
266 | else { | |
267 | cp1 = (char *) &cpu->ipc_buffer[11]; | |
268 | cp2 = buf; | |
269 | strcpy(cp2, cp1); | |
270 | ||
271 | while ((cp2 = strchr(cp2, '\r')) != 0) { | |
272 | *cp2 = ' '; | |
273 | if (cp2[1] == '\n') | |
274 | cp2[1] = ' '; | |
275 | } | |
276 | } | |
277 | ||
278 | DBGS((KERN_INFO "recv_secondary_console_msg: on %d " | |
279 | "message is '%s'\n", mycpu, buf)); | |
280 | } | |
281 | ||
282 | hwrpb->txrdy = 0; | |
283 | } | |
284 | ||
285 | /* | |
286 | * Convince the console to have a secondary cpu begin execution. | |
287 | */ | |
7d6a8a1c | 288 | static int __cpuinit |
1da177e4 LT |
289 | secondary_cpu_start(int cpuid, struct task_struct *idle) |
290 | { | |
291 | struct percpu_struct *cpu; | |
292 | struct pcb_struct *hwpcb, *ipcb; | |
293 | unsigned long timeout; | |
294 | ||
295 | cpu = (struct percpu_struct *) | |
296 | ((char*)hwrpb | |
297 | + hwrpb->processor_offset | |
298 | + cpuid * hwrpb->processor_size); | |
299 | hwpcb = (struct pcb_struct *) cpu->hwpcb; | |
37bfbaf9 | 300 | ipcb = &task_thread_info(idle)->pcb; |
1da177e4 LT |
301 | |
302 | /* Initialize the CPU's HWPCB to something just good enough for | |
303 | us to get started. Immediately after starting, we'll swpctx | |
304 | to the target idle task's pcb. Reuse the stack in the mean | |
305 | time. Precalculate the target PCBB. */ | |
306 | hwpcb->ksp = (unsigned long)ipcb + sizeof(union thread_union) - 16; | |
307 | hwpcb->usp = 0; | |
308 | hwpcb->ptbr = ipcb->ptbr; | |
309 | hwpcb->pcc = 0; | |
310 | hwpcb->asn = 0; | |
311 | hwpcb->unique = virt_to_phys(ipcb); | |
312 | hwpcb->flags = ipcb->flags; | |
313 | hwpcb->res1 = hwpcb->res2 = 0; | |
314 | ||
315 | #if 0 | |
316 | DBGS(("KSP 0x%lx PTBR 0x%lx VPTBR 0x%lx UNIQUE 0x%lx\n", | |
317 | hwpcb->ksp, hwpcb->ptbr, hwrpb->vptb, hwpcb->unique)); | |
318 | #endif | |
319 | DBGS(("Starting secondary cpu %d: state 0x%lx pal_flags 0x%lx\n", | |
320 | cpuid, idle->state, ipcb->flags)); | |
321 | ||
322 | /* Setup HWRPB fields that SRM uses to activate secondary CPU */ | |
323 | hwrpb->CPU_restart = __smp_callin; | |
324 | hwrpb->CPU_restart_data = (unsigned long) __smp_callin; | |
325 | ||
326 | /* Recalculate and update the HWRPB checksum */ | |
327 | hwrpb_update_checksum(hwrpb); | |
328 | ||
329 | /* | |
330 | * Send a "start" command to the specified processor. | |
331 | */ | |
332 | ||
333 | /* SRM III 3.4.1.3 */ | |
334 | cpu->flags |= 0x22; /* turn on Context Valid and Restart Capable */ | |
335 | cpu->flags &= ~1; /* turn off Bootstrap In Progress */ | |
336 | wmb(); | |
337 | ||
338 | send_secondary_console_msg("START\r\n", cpuid); | |
339 | ||
340 | /* Wait 10 seconds for an ACK from the console. */ | |
341 | timeout = jiffies + 10*HZ; | |
342 | while (time_before(jiffies, timeout)) { | |
343 | if (cpu->flags & 1) | |
344 | goto started; | |
345 | udelay(10); | |
346 | barrier(); | |
347 | } | |
348 | printk(KERN_ERR "SMP: Processor %d failed to start.\n", cpuid); | |
349 | return -1; | |
350 | ||
351 | started: | |
352 | DBGS(("secondary_cpu_start: SUCCESS for CPU %d!!!\n", cpuid)); | |
353 | return 0; | |
354 | } | |
355 | ||
356 | /* | |
357 | * Bring one cpu online. | |
358 | */ | |
ed5f6561 | 359 | static int __cpuinit |
1da177e4 LT |
360 | smp_boot_one_cpu(int cpuid) |
361 | { | |
362 | struct task_struct *idle; | |
363 | unsigned long timeout; | |
364 | ||
365 | /* Cook up an idler for this guy. Note that the address we | |
366 | give to kernel_thread is irrelevant -- it's going to start | |
367 | where HWRPB.CPU_restart says to start. But this gets all | |
368 | the other task-y sort of data structures set up like we | |
369 | wish. We can't use kernel_thread since we must avoid | |
370 | rescheduling the child. */ | |
371 | idle = fork_idle(cpuid); | |
372 | if (IS_ERR(idle)) | |
373 | panic("failed fork for CPU %d", cpuid); | |
374 | ||
375 | DBGS(("smp_boot_one_cpu: CPU %d state 0x%lx flags 0x%lx\n", | |
376 | cpuid, idle->state, idle->flags)); | |
377 | ||
378 | /* Signal the secondary to wait a moment. */ | |
379 | smp_secondary_alive = -1; | |
380 | ||
381 | /* Whirrr, whirrr, whirrrrrrrrr... */ | |
382 | if (secondary_cpu_start(cpuid, idle)) | |
383 | return -1; | |
384 | ||
385 | /* Notify the secondary CPU it can run calibrate_delay. */ | |
386 | mb(); | |
387 | smp_secondary_alive = 0; | |
388 | ||
389 | /* We've been acked by the console; wait one second for | |
390 | the task to start up for real. */ | |
391 | timeout = jiffies + 1*HZ; | |
392 | while (time_before(jiffies, timeout)) { | |
393 | if (smp_secondary_alive == 1) | |
394 | goto alive; | |
395 | udelay(10); | |
396 | barrier(); | |
397 | } | |
398 | ||
399 | /* We failed to boot the CPU. */ | |
400 | ||
401 | printk(KERN_ERR "SMP: Processor %d is stuck.\n", cpuid); | |
402 | return -1; | |
403 | ||
404 | alive: | |
405 | /* Another "Red Snapper". */ | |
406 | return 0; | |
407 | } | |
408 | ||
409 | /* | |
410 | * Called from setup_arch. Detect an SMP system and which processors | |
411 | * are present. | |
412 | */ | |
413 | void __init | |
414 | setup_smp(void) | |
415 | { | |
416 | struct percpu_struct *cpubase, *cpu; | |
417 | unsigned long i; | |
418 | ||
419 | if (boot_cpuid != 0) { | |
420 | printk(KERN_WARNING "SMP: Booting off cpu %d instead of 0?\n", | |
421 | boot_cpuid); | |
422 | } | |
423 | ||
424 | if (hwrpb->nr_processors > 1) { | |
425 | int boot_cpu_palrev; | |
426 | ||
427 | DBGS(("setup_smp: nr_processors %ld\n", | |
428 | hwrpb->nr_processors)); | |
429 | ||
430 | cpubase = (struct percpu_struct *) | |
431 | ((char*)hwrpb + hwrpb->processor_offset); | |
432 | boot_cpu_palrev = cpubase->pal_revision; | |
433 | ||
434 | for (i = 0; i < hwrpb->nr_processors; i++) { | |
435 | cpu = (struct percpu_struct *) | |
436 | ((char *)cpubase + i*hwrpb->processor_size); | |
437 | if ((cpu->flags & 0x1cc) == 0x1cc) { | |
438 | smp_num_probed++; | |
1371be0f RR |
439 | set_cpu_possible(i, true); |
440 | set_cpu_present(i, true); | |
1da177e4 LT |
441 | cpu->pal_revision = boot_cpu_palrev; |
442 | } | |
443 | ||
444 | DBGS(("setup_smp: CPU %d: flags 0x%lx type 0x%lx\n", | |
445 | i, cpu->flags, cpu->type)); | |
446 | DBGS(("setup_smp: CPU %d: PAL rev 0x%lx\n", | |
447 | i, cpu->pal_revision)); | |
448 | } | |
449 | } else { | |
450 | smp_num_probed = 1; | |
1da177e4 | 451 | } |
1da177e4 | 452 | |
c7d2d28b IK |
453 | printk(KERN_INFO "SMP: %d CPUs probed -- cpu_present_map = %lx\n", |
454 | smp_num_probed, cpu_present_map.bits[0]); | |
1da177e4 LT |
455 | } |
456 | ||
457 | /* | |
458 | * Called by smp_init prepare the secondaries | |
459 | */ | |
460 | void __init | |
461 | smp_prepare_cpus(unsigned int max_cpus) | |
462 | { | |
1da177e4 LT |
463 | /* Take care of some initial bookkeeping. */ |
464 | memset(ipi_data, 0, sizeof(ipi_data)); | |
465 | ||
466 | current_thread_info()->cpu = boot_cpuid; | |
467 | ||
468 | smp_store_cpu_info(boot_cpuid); | |
469 | smp_setup_percpu_timer(boot_cpuid); | |
470 | ||
471 | /* Nothing to do on a UP box, or when told not to. */ | |
472 | if (smp_num_probed == 1 || max_cpus == 0) { | |
1371be0f RR |
473 | init_cpu_possible(cpumask_of(boot_cpuid)); |
474 | init_cpu_present(cpumask_of(boot_cpuid)); | |
1da177e4 LT |
475 | printk(KERN_INFO "SMP mode deactivated.\n"); |
476 | return; | |
477 | } | |
478 | ||
479 | printk(KERN_INFO "SMP starting up secondaries.\n"); | |
480 | ||
328c2a8a | 481 | smp_num_cpus = smp_num_probed; |
1da177e4 LT |
482 | } |
483 | ||
484 | void __devinit | |
485 | smp_prepare_boot_cpu(void) | |
486 | { | |
1da177e4 LT |
487 | } |
488 | ||
ed5f6561 | 489 | int __cpuinit |
1da177e4 LT |
490 | __cpu_up(unsigned int cpu) |
491 | { | |
492 | smp_boot_one_cpu(cpu); | |
493 | ||
494 | return cpu_online(cpu) ? 0 : -ENOSYS; | |
495 | } | |
496 | ||
497 | void __init | |
498 | smp_cpus_done(unsigned int max_cpus) | |
499 | { | |
500 | int cpu; | |
501 | unsigned long bogosum = 0; | |
502 | ||
503 | for(cpu = 0; cpu < NR_CPUS; cpu++) | |
504 | if (cpu_online(cpu)) | |
505 | bogosum += cpu_data[cpu].loops_per_jiffy; | |
506 | ||
507 | printk(KERN_INFO "SMP: Total of %d processors activated " | |
508 | "(%lu.%02lu BogoMIPS).\n", | |
509 | num_online_cpus(), | |
510 | (bogosum + 2500) / (500000/HZ), | |
511 | ((bogosum + 2500) / (5000/HZ)) % 100); | |
512 | } | |
513 | ||
514 | \f | |
515 | void | |
516 | smp_percpu_timer_interrupt(struct pt_regs *regs) | |
517 | { | |
8774cb81 | 518 | struct pt_regs *old_regs; |
1da177e4 LT |
519 | int cpu = smp_processor_id(); |
520 | unsigned long user = user_mode(regs); | |
521 | struct cpuinfo_alpha *data = &cpu_data[cpu]; | |
522 | ||
8774cb81 AV |
523 | old_regs = set_irq_regs(regs); |
524 | ||
1da177e4 | 525 | /* Record kernel PC. */ |
8774cb81 | 526 | profile_tick(CPU_PROFILING); |
1da177e4 LT |
527 | |
528 | if (!--data->prof_counter) { | |
529 | /* We need to make like a normal interrupt -- otherwise | |
530 | timer interrupts ignore the global interrupt lock, | |
531 | which would be a Bad Thing. */ | |
532 | irq_enter(); | |
533 | ||
534 | update_process_times(user); | |
535 | ||
536 | data->prof_counter = data->prof_multiplier; | |
537 | ||
538 | irq_exit(); | |
539 | } | |
8774cb81 | 540 | set_irq_regs(old_regs); |
1da177e4 LT |
541 | } |
542 | ||
ed5f6561 | 543 | int |
1da177e4 LT |
544 | setup_profiling_timer(unsigned int multiplier) |
545 | { | |
546 | return -EINVAL; | |
547 | } | |
548 | ||
549 | \f | |
550 | static void | |
551 | send_ipi_message(cpumask_t to_whom, enum ipi_message_type operation) | |
552 | { | |
553 | int i; | |
554 | ||
555 | mb(); | |
556 | for_each_cpu_mask(i, to_whom) | |
557 | set_bit(operation, &ipi_data[i].bits); | |
558 | ||
559 | mb(); | |
560 | for_each_cpu_mask(i, to_whom) | |
561 | wripir(i); | |
562 | } | |
563 | ||
1da177e4 LT |
564 | void |
565 | handle_ipi(struct pt_regs *regs) | |
566 | { | |
567 | int this_cpu = smp_processor_id(); | |
568 | unsigned long *pending_ipis = &ipi_data[this_cpu].bits; | |
569 | unsigned long ops; | |
570 | ||
571 | #if 0 | |
572 | DBGS(("handle_ipi: on CPU %d ops 0x%lx PC 0x%lx\n", | |
573 | this_cpu, *pending_ipis, regs->pc)); | |
574 | #endif | |
575 | ||
576 | mb(); /* Order interrupt and bit testing. */ | |
577 | while ((ops = xchg(pending_ipis, 0)) != 0) { | |
578 | mb(); /* Order bit clearing and data access. */ | |
579 | do { | |
580 | unsigned long which; | |
581 | ||
582 | which = ops & -ops; | |
583 | ops &= ~which; | |
584 | which = __ffs(which); | |
585 | ||
586 | switch (which) { | |
587 | case IPI_RESCHEDULE: | |
588 | /* Reschedule callback. Everything to be done | |
589 | is done by the interrupt return path. */ | |
590 | break; | |
591 | ||
592 | case IPI_CALL_FUNC: | |
c524a1d8 JA |
593 | generic_smp_call_function_interrupt(); |
594 | break; | |
595 | ||
596 | case IPI_CALL_FUNC_SINGLE: | |
597 | generic_smp_call_function_single_interrupt(); | |
1da177e4 | 598 | break; |
1da177e4 LT |
599 | |
600 | case IPI_CPU_STOP: | |
601 | halt(); | |
602 | ||
603 | default: | |
604 | printk(KERN_CRIT "Unknown IPI on CPU %d: %lu\n", | |
605 | this_cpu, which); | |
606 | break; | |
607 | } | |
608 | } while (ops); | |
609 | ||
610 | mb(); /* Order data access and bit testing. */ | |
611 | } | |
612 | ||
613 | cpu_data[this_cpu].ipi_count++; | |
614 | ||
615 | if (hwrpb->txrdy) | |
616 | recv_secondary_console_msg(); | |
617 | } | |
618 | ||
619 | void | |
620 | smp_send_reschedule(int cpu) | |
621 | { | |
622 | #ifdef DEBUG_IPI_MSG | |
623 | if (cpu == hard_smp_processor_id()) | |
624 | printk(KERN_WARNING | |
625 | "smp_send_reschedule: Sending IPI to self.\n"); | |
626 | #endif | |
627 | send_ipi_message(cpumask_of_cpu(cpu), IPI_RESCHEDULE); | |
628 | } | |
629 | ||
630 | void | |
631 | smp_send_stop(void) | |
632 | { | |
633 | cpumask_t to_whom = cpu_possible_map; | |
634 | cpu_clear(smp_processor_id(), to_whom); | |
635 | #ifdef DEBUG_IPI_MSG | |
636 | if (hard_smp_processor_id() != boot_cpu_id) | |
637 | printk(KERN_WARNING "smp_send_stop: Not on boot cpu.\n"); | |
638 | #endif | |
639 | send_ipi_message(to_whom, IPI_CPU_STOP); | |
640 | } | |
641 | ||
c524a1d8 | 642 | void arch_send_call_function_ipi(cpumask_t mask) |
1da177e4 | 643 | { |
c524a1d8 | 644 | send_ipi_message(mask, IPI_CALL_FUNC); |
1da177e4 LT |
645 | } |
646 | ||
c524a1d8 | 647 | void arch_send_call_function_single_ipi(int cpu) |
1da177e4 | 648 | { |
c524a1d8 | 649 | send_ipi_message(cpumask_of_cpu(cpu), IPI_CALL_FUNC_SINGLE); |
1da177e4 LT |
650 | } |
651 | ||
652 | static void | |
653 | ipi_imb(void *ignored) | |
654 | { | |
655 | imb(); | |
656 | } | |
657 | ||
658 | void | |
659 | smp_imb(void) | |
660 | { | |
661 | /* Must wait other processors to flush their icache before continue. */ | |
15c8b6c1 | 662 | if (on_each_cpu(ipi_imb, NULL, 1)) |
1da177e4 LT |
663 | printk(KERN_CRIT "smp_imb: timed out\n"); |
664 | } | |
cff52daf | 665 | EXPORT_SYMBOL(smp_imb); |
1da177e4 LT |
666 | |
667 | static void | |
668 | ipi_flush_tlb_all(void *ignored) | |
669 | { | |
670 | tbia(); | |
671 | } | |
672 | ||
673 | void | |
674 | flush_tlb_all(void) | |
675 | { | |
676 | /* Although we don't have any data to pass, we do want to | |
677 | synchronize with the other processors. */ | |
15c8b6c1 | 678 | if (on_each_cpu(ipi_flush_tlb_all, NULL, 1)) { |
1da177e4 LT |
679 | printk(KERN_CRIT "flush_tlb_all: timed out\n"); |
680 | } | |
681 | } | |
682 | ||
683 | #define asn_locked() (cpu_data[smp_processor_id()].asn_lock) | |
684 | ||
685 | static void | |
686 | ipi_flush_tlb_mm(void *x) | |
687 | { | |
688 | struct mm_struct *mm = (struct mm_struct *) x; | |
689 | if (mm == current->active_mm && !asn_locked()) | |
690 | flush_tlb_current(mm); | |
691 | else | |
692 | flush_tlb_other(mm); | |
693 | } | |
694 | ||
695 | void | |
696 | flush_tlb_mm(struct mm_struct *mm) | |
697 | { | |
698 | preempt_disable(); | |
699 | ||
700 | if (mm == current->active_mm) { | |
701 | flush_tlb_current(mm); | |
702 | if (atomic_read(&mm->mm_users) <= 1) { | |
703 | int cpu, this_cpu = smp_processor_id(); | |
704 | for (cpu = 0; cpu < NR_CPUS; cpu++) { | |
705 | if (!cpu_online(cpu) || cpu == this_cpu) | |
706 | continue; | |
707 | if (mm->context[cpu]) | |
708 | mm->context[cpu] = 0; | |
709 | } | |
710 | preempt_enable(); | |
711 | return; | |
712 | } | |
713 | } | |
714 | ||
8691e5a8 | 715 | if (smp_call_function(ipi_flush_tlb_mm, mm, 1)) { |
1da177e4 LT |
716 | printk(KERN_CRIT "flush_tlb_mm: timed out\n"); |
717 | } | |
718 | ||
719 | preempt_enable(); | |
720 | } | |
cff52daf | 721 | EXPORT_SYMBOL(flush_tlb_mm); |
1da177e4 LT |
722 | |
723 | struct flush_tlb_page_struct { | |
724 | struct vm_area_struct *vma; | |
725 | struct mm_struct *mm; | |
726 | unsigned long addr; | |
727 | }; | |
728 | ||
729 | static void | |
730 | ipi_flush_tlb_page(void *x) | |
731 | { | |
732 | struct flush_tlb_page_struct *data = (struct flush_tlb_page_struct *)x; | |
733 | struct mm_struct * mm = data->mm; | |
734 | ||
735 | if (mm == current->active_mm && !asn_locked()) | |
736 | flush_tlb_current_page(mm, data->vma, data->addr); | |
737 | else | |
738 | flush_tlb_other(mm); | |
739 | } | |
740 | ||
741 | void | |
742 | flush_tlb_page(struct vm_area_struct *vma, unsigned long addr) | |
743 | { | |
744 | struct flush_tlb_page_struct data; | |
745 | struct mm_struct *mm = vma->vm_mm; | |
746 | ||
747 | preempt_disable(); | |
748 | ||
749 | if (mm == current->active_mm) { | |
750 | flush_tlb_current_page(mm, vma, addr); | |
751 | if (atomic_read(&mm->mm_users) <= 1) { | |
752 | int cpu, this_cpu = smp_processor_id(); | |
753 | for (cpu = 0; cpu < NR_CPUS; cpu++) { | |
754 | if (!cpu_online(cpu) || cpu == this_cpu) | |
755 | continue; | |
756 | if (mm->context[cpu]) | |
757 | mm->context[cpu] = 0; | |
758 | } | |
759 | preempt_enable(); | |
760 | return; | |
761 | } | |
762 | } | |
763 | ||
764 | data.vma = vma; | |
765 | data.mm = mm; | |
766 | data.addr = addr; | |
767 | ||
8691e5a8 | 768 | if (smp_call_function(ipi_flush_tlb_page, &data, 1)) { |
1da177e4 LT |
769 | printk(KERN_CRIT "flush_tlb_page: timed out\n"); |
770 | } | |
771 | ||
772 | preempt_enable(); | |
773 | } | |
cff52daf | 774 | EXPORT_SYMBOL(flush_tlb_page); |
1da177e4 LT |
775 | |
776 | void | |
777 | flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) | |
778 | { | |
779 | /* On the Alpha we always flush the whole user tlb. */ | |
780 | flush_tlb_mm(vma->vm_mm); | |
781 | } | |
cff52daf | 782 | EXPORT_SYMBOL(flush_tlb_range); |
1da177e4 LT |
783 | |
784 | static void | |
785 | ipi_flush_icache_page(void *x) | |
786 | { | |
787 | struct mm_struct *mm = (struct mm_struct *) x; | |
788 | if (mm == current->active_mm && !asn_locked()) | |
789 | __load_new_mm_context(mm); | |
790 | else | |
791 | flush_tlb_other(mm); | |
792 | } | |
793 | ||
794 | void | |
795 | flush_icache_user_range(struct vm_area_struct *vma, struct page *page, | |
796 | unsigned long addr, int len) | |
797 | { | |
798 | struct mm_struct *mm = vma->vm_mm; | |
799 | ||
800 | if ((vma->vm_flags & VM_EXEC) == 0) | |
801 | return; | |
802 | ||
803 | preempt_disable(); | |
804 | ||
805 | if (mm == current->active_mm) { | |
806 | __load_new_mm_context(mm); | |
807 | if (atomic_read(&mm->mm_users) <= 1) { | |
808 | int cpu, this_cpu = smp_processor_id(); | |
809 | for (cpu = 0; cpu < NR_CPUS; cpu++) { | |
810 | if (!cpu_online(cpu) || cpu == this_cpu) | |
811 | continue; | |
812 | if (mm->context[cpu]) | |
813 | mm->context[cpu] = 0; | |
814 | } | |
815 | preempt_enable(); | |
816 | return; | |
817 | } | |
818 | } | |
819 | ||
8691e5a8 | 820 | if (smp_call_function(ipi_flush_icache_page, mm, 1)) { |
1da177e4 LT |
821 | printk(KERN_CRIT "flush_icache_page: timed out\n"); |
822 | } | |
823 | ||
824 | preempt_enable(); | |
825 | } |