]> git.openfabrics.org - ~shefty/rdma-dev.git/blob - arch/alpha/kernel/smp.c
a41ad90a97a692b039a2e8dbee2f57aa4b1a3300
[~shefty/rdma-dev.git] / arch / alpha / kernel / smp.c
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>
19 #include <linux/err.h>
20 #include <linux/threads.h>
21 #include <linux/smp.h>
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>
30 #include <linux/cpu.h>
31
32 #include <asm/hwrpb.h>
33 #include <asm/ptrace.h>
34 #include <linux/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];
56 EXPORT_SYMBOL(cpu_data);
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,
66         IPI_CALL_FUNC_SINGLE,
67         IPI_CPU_STOP,
68 };
69
70 /* Set to a secondary's cpuid when it comes online.  */
71 static int smp_secondary_alive __devinitdata = 0;
72
73 int smp_num_probed;             /* Internal processor count */
74 int smp_num_cpus = 1;           /* Number that came online.  */
75 EXPORT_SYMBOL(smp_num_cpus);
76
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  */
119 void __cpuinit
120 smp_callin(void)
121 {
122         int cpuid = hard_smp_processor_id();
123
124         if (cpu_online(cpuid)) {
125                 printk("??, cpu 0x%x already present??\n", cpuid);
126                 BUG();
127         }
128         set_cpu_online(cpuid, true);
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
149         /* inform the notifiers about the new cpu */
150         notify_cpu_starting(cpuid);
151
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         preempt_disable();
170         /* Do nothing.  */
171         cpu_idle();
172 }
173
174 /* Wait until hwrpb->txrdy is clear for cpu.  Return -1 on timeout.  */
175 static int __devinit
176 wait_for_txrdy (unsigned long cpumask)
177 {
178         unsigned long timeout;
179
180         if (!(hwrpb->txrdy & cpumask))
181                 return 0;
182
183         timeout = jiffies + 10*HZ;
184         while (time_before(jiffies, timeout)) {
185                 if (!(hwrpb->txrdy & cpumask))
186                         return 0;
187                 udelay(10);
188                 barrier();
189         }
190
191         return -1;
192 }
193
194 /*
195  * Send a message to a secondary's console.  "START" is one such
196  * interesting message.  ;-)
197  */
198 static void __cpuinit
199 send_secondary_console_msg(char *str, int cpuid)
200 {
201         struct percpu_struct *cpu;
202         register char *cp1, *cp2;
203         unsigned long cpumask;
204         size_t len;
205
206         cpu = (struct percpu_struct *)
207                 ((char*)hwrpb
208                  + hwrpb->processor_offset
209                  + cpuid * hwrpb->processor_size);
210
211         cpumask = (1UL << cpuid);
212         if (wait_for_txrdy(cpumask))
213                 goto timeout;
214
215         cp2 = str;
216         len = strlen(cp2);
217         *(unsigned int *)&cpu->ipc_buffer[0] = len;
218         cp1 = (char *) &cpu->ipc_buffer[1];
219         memcpy(cp1, cp2, len);
220
221         /* atomic test and set */
222         wmb();
223         set_bit(cpuid, &hwrpb->rxrdy);
224
225         if (wait_for_txrdy(cpumask))
226                 goto timeout;
227         return;
228
229  timeout:
230         printk("Processor %x not ready\n", cpuid);
231 }
232
233 /*
234  * A secondary console wants to send a message.  Receive it.
235  */
236 static void
237 recv_secondary_console_msg(void)
238 {
239         int mycpu, i, cnt;
240         unsigned long txrdy = hwrpb->txrdy;
241         char *cp1, *cp2, buf[80];
242         struct percpu_struct *cpu;
243
244         DBGS(("recv_secondary_console_msg: TXRDY 0x%lx.\n", txrdy));
245
246         mycpu = hard_smp_processor_id();
247
248         for (i = 0; i < NR_CPUS; i++) {
249                 if (!(txrdy & (1UL << i)))
250                         continue;
251
252                 DBGS(("recv_secondary_console_msg: "
253                       "TXRDY contains CPU %d.\n", i));
254
255                 cpu = (struct percpu_struct *)
256                   ((char*)hwrpb
257                    + hwrpb->processor_offset
258                    + i * hwrpb->processor_size);
259
260                 DBGS(("recv_secondary_console_msg: on %d from %d"
261                       " HALT_REASON 0x%lx FLAGS 0x%lx\n",
262                       mycpu, i, cpu->halt_reason, cpu->flags));
263
264                 cnt = cpu->ipc_buffer[0] >> 32;
265                 if (cnt <= 0 || cnt >= 80)
266                         strcpy(buf, "<<< BOGUS MSG >>>");
267                 else {
268                         cp1 = (char *) &cpu->ipc_buffer[11];
269                         cp2 = buf;
270                         strcpy(cp2, cp1);
271                         
272                         while ((cp2 = strchr(cp2, '\r')) != 0) {
273                                 *cp2 = ' ';
274                                 if (cp2[1] == '\n')
275                                         cp2[1] = ' ';
276                         }
277                 }
278
279                 DBGS((KERN_INFO "recv_secondary_console_msg: on %d "
280                       "message is '%s'\n", mycpu, buf));
281         }
282
283         hwrpb->txrdy = 0;
284 }
285
286 /*
287  * Convince the console to have a secondary cpu begin execution.
288  */
289 static int __cpuinit
290 secondary_cpu_start(int cpuid, struct task_struct *idle)
291 {
292         struct percpu_struct *cpu;
293         struct pcb_struct *hwpcb, *ipcb;
294         unsigned long timeout;
295           
296         cpu = (struct percpu_struct *)
297                 ((char*)hwrpb
298                  + hwrpb->processor_offset
299                  + cpuid * hwrpb->processor_size);
300         hwpcb = (struct pcb_struct *) cpu->hwpcb;
301         ipcb = &task_thread_info(idle)->pcb;
302
303         /* Initialize the CPU's HWPCB to something just good enough for
304            us to get started.  Immediately after starting, we'll swpctx
305            to the target idle task's pcb.  Reuse the stack in the mean
306            time.  Precalculate the target PCBB.  */
307         hwpcb->ksp = (unsigned long)ipcb + sizeof(union thread_union) - 16;
308         hwpcb->usp = 0;
309         hwpcb->ptbr = ipcb->ptbr;
310         hwpcb->pcc = 0;
311         hwpcb->asn = 0;
312         hwpcb->unique = virt_to_phys(ipcb);
313         hwpcb->flags = ipcb->flags;
314         hwpcb->res1 = hwpcb->res2 = 0;
315
316 #if 0
317         DBGS(("KSP 0x%lx PTBR 0x%lx VPTBR 0x%lx UNIQUE 0x%lx\n",
318               hwpcb->ksp, hwpcb->ptbr, hwrpb->vptb, hwpcb->unique));
319 #endif
320         DBGS(("Starting secondary cpu %d: state 0x%lx pal_flags 0x%lx\n",
321               cpuid, idle->state, ipcb->flags));
322
323         /* Setup HWRPB fields that SRM uses to activate secondary CPU */
324         hwrpb->CPU_restart = __smp_callin;
325         hwrpb->CPU_restart_data = (unsigned long) __smp_callin;
326
327         /* Recalculate and update the HWRPB checksum */
328         hwrpb_update_checksum(hwrpb);
329
330         /*
331          * Send a "start" command to the specified processor.
332          */
333
334         /* SRM III 3.4.1.3 */
335         cpu->flags |= 0x22;     /* turn on Context Valid and Restart Capable */
336         cpu->flags &= ~1;       /* turn off Bootstrap In Progress */
337         wmb();
338
339         send_secondary_console_msg("START\r\n", cpuid);
340
341         /* Wait 10 seconds for an ACK from the console.  */
342         timeout = jiffies + 10*HZ;
343         while (time_before(jiffies, timeout)) {
344                 if (cpu->flags & 1)
345                         goto started;
346                 udelay(10);
347                 barrier();
348         }
349         printk(KERN_ERR "SMP: Processor %d failed to start.\n", cpuid);
350         return -1;
351
352  started:
353         DBGS(("secondary_cpu_start: SUCCESS for CPU %d!!!\n", cpuid));
354         return 0;
355 }
356
357 /*
358  * Bring one cpu online.
359  */
360 static int __cpuinit
361 smp_boot_one_cpu(int cpuid, struct task_struct *idle)
362 {
363         unsigned long timeout;
364
365         /* Signal the secondary to wait a moment.  */
366         smp_secondary_alive = -1;
367
368         /* Whirrr, whirrr, whirrrrrrrrr... */
369         if (secondary_cpu_start(cpuid, idle))
370                 return -1;
371
372         /* Notify the secondary CPU it can run calibrate_delay.  */
373         mb();
374         smp_secondary_alive = 0;
375
376         /* We've been acked by the console; wait one second for
377            the task to start up for real.  */
378         timeout = jiffies + 1*HZ;
379         while (time_before(jiffies, timeout)) {
380                 if (smp_secondary_alive == 1)
381                         goto alive;
382                 udelay(10);
383                 barrier();
384         }
385
386         /* We failed to boot the CPU.  */
387
388         printk(KERN_ERR "SMP: Processor %d is stuck.\n", cpuid);
389         return -1;
390
391  alive:
392         /* Another "Red Snapper". */
393         return 0;
394 }
395
396 /*
397  * Called from setup_arch.  Detect an SMP system and which processors
398  * are present.
399  */
400 void __init
401 setup_smp(void)
402 {
403         struct percpu_struct *cpubase, *cpu;
404         unsigned long i;
405
406         if (boot_cpuid != 0) {
407                 printk(KERN_WARNING "SMP: Booting off cpu %d instead of 0?\n",
408                        boot_cpuid);
409         }
410
411         if (hwrpb->nr_processors > 1) {
412                 int boot_cpu_palrev;
413
414                 DBGS(("setup_smp: nr_processors %ld\n",
415                       hwrpb->nr_processors));
416
417                 cpubase = (struct percpu_struct *)
418                         ((char*)hwrpb + hwrpb->processor_offset);
419                 boot_cpu_palrev = cpubase->pal_revision;
420
421                 for (i = 0; i < hwrpb->nr_processors; i++) {
422                         cpu = (struct percpu_struct *)
423                                 ((char *)cpubase + i*hwrpb->processor_size);
424                         if ((cpu->flags & 0x1cc) == 0x1cc) {
425                                 smp_num_probed++;
426                                 set_cpu_possible(i, true);
427                                 set_cpu_present(i, true);
428                                 cpu->pal_revision = boot_cpu_palrev;
429                         }
430
431                         DBGS(("setup_smp: CPU %d: flags 0x%lx type 0x%lx\n",
432                               i, cpu->flags, cpu->type));
433                         DBGS(("setup_smp: CPU %d: PAL rev 0x%lx\n",
434                               i, cpu->pal_revision));
435                 }
436         } else {
437                 smp_num_probed = 1;
438         }
439
440         printk(KERN_INFO "SMP: %d CPUs probed -- cpu_present_mask = %lx\n",
441                smp_num_probed, cpumask_bits(cpu_present_mask)[0]);
442 }
443
444 /*
445  * Called by smp_init prepare the secondaries
446  */
447 void __init
448 smp_prepare_cpus(unsigned int max_cpus)
449 {
450         /* Take care of some initial bookkeeping.  */
451         memset(ipi_data, 0, sizeof(ipi_data));
452
453         current_thread_info()->cpu = boot_cpuid;
454
455         smp_store_cpu_info(boot_cpuid);
456         smp_setup_percpu_timer(boot_cpuid);
457
458         /* Nothing to do on a UP box, or when told not to.  */
459         if (smp_num_probed == 1 || max_cpus == 0) {
460                 init_cpu_possible(cpumask_of(boot_cpuid));
461                 init_cpu_present(cpumask_of(boot_cpuid));
462                 printk(KERN_INFO "SMP mode deactivated.\n");
463                 return;
464         }
465
466         printk(KERN_INFO "SMP starting up secondaries.\n");
467
468         smp_num_cpus = smp_num_probed;
469 }
470
471 void __devinit
472 smp_prepare_boot_cpu(void)
473 {
474 }
475
476 int __cpuinit
477 __cpu_up(unsigned int cpu, struct task_struct *tidle)
478 {
479         smp_boot_one_cpu(cpu, tidle);
480
481         return cpu_online(cpu) ? 0 : -ENOSYS;
482 }
483
484 void __init
485 smp_cpus_done(unsigned int max_cpus)
486 {
487         int cpu;
488         unsigned long bogosum = 0;
489
490         for(cpu = 0; cpu < NR_CPUS; cpu++) 
491                 if (cpu_online(cpu))
492                         bogosum += cpu_data[cpu].loops_per_jiffy;
493         
494         printk(KERN_INFO "SMP: Total of %d processors activated "
495                "(%lu.%02lu BogoMIPS).\n",
496                num_online_cpus(), 
497                (bogosum + 2500) / (500000/HZ),
498                ((bogosum + 2500) / (5000/HZ)) % 100);
499 }
500
501 \f
502 void
503 smp_percpu_timer_interrupt(struct pt_regs *regs)
504 {
505         struct pt_regs *old_regs;
506         int cpu = smp_processor_id();
507         unsigned long user = user_mode(regs);
508         struct cpuinfo_alpha *data = &cpu_data[cpu];
509
510         old_regs = set_irq_regs(regs);
511
512         /* Record kernel PC.  */
513         profile_tick(CPU_PROFILING);
514
515         if (!--data->prof_counter) {
516                 /* We need to make like a normal interrupt -- otherwise
517                    timer interrupts ignore the global interrupt lock,
518                    which would be a Bad Thing.  */
519                 irq_enter();
520
521                 update_process_times(user);
522
523                 data->prof_counter = data->prof_multiplier;
524
525                 irq_exit();
526         }
527         set_irq_regs(old_regs);
528 }
529
530 int
531 setup_profiling_timer(unsigned int multiplier)
532 {
533         return -EINVAL;
534 }
535
536 \f
537 static void
538 send_ipi_message(const struct cpumask *to_whom, enum ipi_message_type operation)
539 {
540         int i;
541
542         mb();
543         for_each_cpu(i, to_whom)
544                 set_bit(operation, &ipi_data[i].bits);
545
546         mb();
547         for_each_cpu(i, to_whom)
548                 wripir(i);
549 }
550
551 void
552 handle_ipi(struct pt_regs *regs)
553 {
554         int this_cpu = smp_processor_id();
555         unsigned long *pending_ipis = &ipi_data[this_cpu].bits;
556         unsigned long ops;
557
558 #if 0
559         DBGS(("handle_ipi: on CPU %d ops 0x%lx PC 0x%lx\n",
560               this_cpu, *pending_ipis, regs->pc));
561 #endif
562
563         mb();   /* Order interrupt and bit testing. */
564         while ((ops = xchg(pending_ipis, 0)) != 0) {
565           mb(); /* Order bit clearing and data access. */
566           do {
567                 unsigned long which;
568
569                 which = ops & -ops;
570                 ops &= ~which;
571                 which = __ffs(which);
572
573                 switch (which) {
574                 case IPI_RESCHEDULE:
575                         scheduler_ipi();
576                         break;
577
578                 case IPI_CALL_FUNC:
579                         generic_smp_call_function_interrupt();
580                         break;
581
582                 case IPI_CALL_FUNC_SINGLE:
583                         generic_smp_call_function_single_interrupt();
584                         break;
585
586                 case IPI_CPU_STOP:
587                         halt();
588
589                 default:
590                         printk(KERN_CRIT "Unknown IPI on CPU %d: %lu\n",
591                                this_cpu, which);
592                         break;
593                 }
594           } while (ops);
595
596           mb(); /* Order data access and bit testing. */
597         }
598
599         cpu_data[this_cpu].ipi_count++;
600
601         if (hwrpb->txrdy)
602                 recv_secondary_console_msg();
603 }
604
605 void
606 smp_send_reschedule(int cpu)
607 {
608 #ifdef DEBUG_IPI_MSG
609         if (cpu == hard_smp_processor_id())
610                 printk(KERN_WARNING
611                        "smp_send_reschedule: Sending IPI to self.\n");
612 #endif
613         send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE);
614 }
615
616 void
617 smp_send_stop(void)
618 {
619         cpumask_t to_whom;
620         cpumask_copy(&to_whom, cpu_possible_mask);
621         cpumask_clear_cpu(smp_processor_id(), &to_whom);
622 #ifdef DEBUG_IPI_MSG
623         if (hard_smp_processor_id() != boot_cpu_id)
624                 printk(KERN_WARNING "smp_send_stop: Not on boot cpu.\n");
625 #endif
626         send_ipi_message(&to_whom, IPI_CPU_STOP);
627 }
628
629 void arch_send_call_function_ipi_mask(const struct cpumask *mask)
630 {
631         send_ipi_message(mask, IPI_CALL_FUNC);
632 }
633
634 void arch_send_call_function_single_ipi(int cpu)
635 {
636         send_ipi_message(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
637 }
638
639 static void
640 ipi_imb(void *ignored)
641 {
642         imb();
643 }
644
645 void
646 smp_imb(void)
647 {
648         /* Must wait other processors to flush their icache before continue. */
649         if (on_each_cpu(ipi_imb, NULL, 1))
650                 printk(KERN_CRIT "smp_imb: timed out\n");
651 }
652 EXPORT_SYMBOL(smp_imb);
653
654 static void
655 ipi_flush_tlb_all(void *ignored)
656 {
657         tbia();
658 }
659
660 void
661 flush_tlb_all(void)
662 {
663         /* Although we don't have any data to pass, we do want to
664            synchronize with the other processors.  */
665         if (on_each_cpu(ipi_flush_tlb_all, NULL, 1)) {
666                 printk(KERN_CRIT "flush_tlb_all: timed out\n");
667         }
668 }
669
670 #define asn_locked() (cpu_data[smp_processor_id()].asn_lock)
671
672 static void
673 ipi_flush_tlb_mm(void *x)
674 {
675         struct mm_struct *mm = (struct mm_struct *) x;
676         if (mm == current->active_mm && !asn_locked())
677                 flush_tlb_current(mm);
678         else
679                 flush_tlb_other(mm);
680 }
681
682 void
683 flush_tlb_mm(struct mm_struct *mm)
684 {
685         preempt_disable();
686
687         if (mm == current->active_mm) {
688                 flush_tlb_current(mm);
689                 if (atomic_read(&mm->mm_users) <= 1) {
690                         int cpu, this_cpu = smp_processor_id();
691                         for (cpu = 0; cpu < NR_CPUS; cpu++) {
692                                 if (!cpu_online(cpu) || cpu == this_cpu)
693                                         continue;
694                                 if (mm->context[cpu])
695                                         mm->context[cpu] = 0;
696                         }
697                         preempt_enable();
698                         return;
699                 }
700         }
701
702         if (smp_call_function(ipi_flush_tlb_mm, mm, 1)) {
703                 printk(KERN_CRIT "flush_tlb_mm: timed out\n");
704         }
705
706         preempt_enable();
707 }
708 EXPORT_SYMBOL(flush_tlb_mm);
709
710 struct flush_tlb_page_struct {
711         struct vm_area_struct *vma;
712         struct mm_struct *mm;
713         unsigned long addr;
714 };
715
716 static void
717 ipi_flush_tlb_page(void *x)
718 {
719         struct flush_tlb_page_struct *data = (struct flush_tlb_page_struct *)x;
720         struct mm_struct * mm = data->mm;
721
722         if (mm == current->active_mm && !asn_locked())
723                 flush_tlb_current_page(mm, data->vma, data->addr);
724         else
725                 flush_tlb_other(mm);
726 }
727
728 void
729 flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
730 {
731         struct flush_tlb_page_struct data;
732         struct mm_struct *mm = vma->vm_mm;
733
734         preempt_disable();
735
736         if (mm == current->active_mm) {
737                 flush_tlb_current_page(mm, vma, addr);
738                 if (atomic_read(&mm->mm_users) <= 1) {
739                         int cpu, this_cpu = smp_processor_id();
740                         for (cpu = 0; cpu < NR_CPUS; cpu++) {
741                                 if (!cpu_online(cpu) || cpu == this_cpu)
742                                         continue;
743                                 if (mm->context[cpu])
744                                         mm->context[cpu] = 0;
745                         }
746                         preempt_enable();
747                         return;
748                 }
749         }
750
751         data.vma = vma;
752         data.mm = mm;
753         data.addr = addr;
754
755         if (smp_call_function(ipi_flush_tlb_page, &data, 1)) {
756                 printk(KERN_CRIT "flush_tlb_page: timed out\n");
757         }
758
759         preempt_enable();
760 }
761 EXPORT_SYMBOL(flush_tlb_page);
762
763 void
764 flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
765 {
766         /* On the Alpha we always flush the whole user tlb.  */
767         flush_tlb_mm(vma->vm_mm);
768 }
769 EXPORT_SYMBOL(flush_tlb_range);
770
771 static void
772 ipi_flush_icache_page(void *x)
773 {
774         struct mm_struct *mm = (struct mm_struct *) x;
775         if (mm == current->active_mm && !asn_locked())
776                 __load_new_mm_context(mm);
777         else
778                 flush_tlb_other(mm);
779 }
780
781 void
782 flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
783                         unsigned long addr, int len)
784 {
785         struct mm_struct *mm = vma->vm_mm;
786
787         if ((vma->vm_flags & VM_EXEC) == 0)
788                 return;
789
790         preempt_disable();
791
792         if (mm == current->active_mm) {
793                 __load_new_mm_context(mm);
794                 if (atomic_read(&mm->mm_users) <= 1) {
795                         int cpu, this_cpu = smp_processor_id();
796                         for (cpu = 0; cpu < NR_CPUS; cpu++) {
797                                 if (!cpu_online(cpu) || cpu == this_cpu)
798                                         continue;
799                                 if (mm->context[cpu])
800                                         mm->context[cpu] = 0;
801                         }
802                         preempt_enable();
803                         return;
804                 }
805         }
806
807         if (smp_call_function(ipi_flush_icache_page, mm, 1)) {
808                 printk(KERN_CRIT "flush_icache_page: timed out\n");
809         }
810
811         preempt_enable();
812 }