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Linux/arch/metag/kernel/smp.c

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  1 /*
  2  *  Copyright (C) 2009,2010,2011 Imagination Technologies Ltd.
  3  *
  4  *  Copyright (C) 2002 ARM Limited, All Rights Reserved.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 #include <linux/atomic.h>
 11 #include <linux/completion.h>
 12 #include <linux/delay.h>
 13 #include <linux/init.h>
 14 #include <linux/spinlock.h>
 15 #include <linux/sched.h>
 16 #include <linux/interrupt.h>
 17 #include <linux/cache.h>
 18 #include <linux/profile.h>
 19 #include <linux/errno.h>
 20 #include <linux/mm.h>
 21 #include <linux/err.h>
 22 #include <linux/cpu.h>
 23 #include <linux/smp.h>
 24 #include <linux/seq_file.h>
 25 #include <linux/irq.h>
 26 #include <linux/bootmem.h>
 27 
 28 #include <asm/cacheflush.h>
 29 #include <asm/cachepart.h>
 30 #include <asm/core_reg.h>
 31 #include <asm/cpu.h>
 32 #include <asm/global_lock.h>
 33 #include <asm/metag_mem.h>
 34 #include <asm/mmu_context.h>
 35 #include <asm/pgtable.h>
 36 #include <asm/pgalloc.h>
 37 #include <asm/processor.h>
 38 #include <asm/setup.h>
 39 #include <asm/tlbflush.h>
 40 #include <asm/hwthread.h>
 41 #include <asm/traps.h>
 42 
 43 #define SYSC_DCPART(n)  (SYSC_DCPART0 + SYSC_xCPARTn_STRIDE * (n))
 44 #define SYSC_ICPART(n)  (SYSC_ICPART0 + SYSC_xCPARTn_STRIDE * (n))
 45 
 46 DECLARE_PER_CPU(PTBI, pTBI);
 47 
 48 void *secondary_data_stack;
 49 
 50 /*
 51  * structures for inter-processor calls
 52  * - A collection of single bit ipi messages.
 53  */
 54 struct ipi_data {
 55         spinlock_t lock;
 56         unsigned long ipi_count;
 57         unsigned long bits;
 58 };
 59 
 60 static DEFINE_PER_CPU(struct ipi_data, ipi_data) = {
 61         .lock   = __SPIN_LOCK_UNLOCKED(ipi_data.lock),
 62 };
 63 
 64 static DEFINE_SPINLOCK(boot_lock);
 65 
 66 static DECLARE_COMPLETION(cpu_running);
 67 
 68 /*
 69  * "thread" is assumed to be a valid Meta hardware thread ID.
 70  */
 71 static int boot_secondary(unsigned int thread, struct task_struct *idle)
 72 {
 73         u32 val;
 74 
 75         /*
 76          * set synchronisation state between this boot processor
 77          * and the secondary one
 78          */
 79         spin_lock(&boot_lock);
 80 
 81         core_reg_write(TXUPC_ID, 0, thread, (unsigned int)secondary_startup);
 82         core_reg_write(TXUPC_ID, 1, thread, 0);
 83 
 84         /*
 85          * Give the thread privilege (PSTAT) and clear potentially problematic
 86          * bits in the process (namely ISTAT, CBMarker, CBMarkerI, LSM_STEP).
 87          */
 88         core_reg_write(TXUCT_ID, TXSTATUS_REGNUM, thread, TXSTATUS_PSTAT_BIT);
 89 
 90         /* Clear the minim enable bit. */
 91         val = core_reg_read(TXUCT_ID, TXPRIVEXT_REGNUM, thread);
 92         core_reg_write(TXUCT_ID, TXPRIVEXT_REGNUM, thread, val & ~0x80);
 93 
 94         /*
 95          * set the ThreadEnable bit (0x1) in the TXENABLE register
 96          * for the specified thread - off it goes!
 97          */
 98         val = core_reg_read(TXUCT_ID, TXENABLE_REGNUM, thread);
 99         core_reg_write(TXUCT_ID, TXENABLE_REGNUM, thread, val | 0x1);
100 
101         /*
102          * now the secondary core is starting up let it run its
103          * calibrations, then wait for it to finish
104          */
105         spin_unlock(&boot_lock);
106 
107         return 0;
108 }
109 
110 /**
111  * describe_cachepart_change: describe a change to cache partitions.
112  * @thread:     Hardware thread number.
113  * @label:      Label of cache type, e.g. "dcache" or "icache".
114  * @sz:         Total size of the cache.
115  * @old:        Old cache partition configuration (*CPART* register).
116  * @new:        New cache partition configuration (*CPART* register).
117  *
118  * If the cache partition has changed, prints a message to the log describing
119  * those changes.
120  */
121 static void describe_cachepart_change(unsigned int thread, const char *label,
122                                       unsigned int sz, unsigned int old,
123                                       unsigned int new)
124 {
125         unsigned int lor1, land1, gor1, gand1;
126         unsigned int lor2, land2, gor2, gand2;
127         unsigned int diff = old ^ new;
128 
129         if (!diff)
130                 return;
131 
132         pr_info("Thread %d: %s partition changed:", thread, label);
133         if (diff & (SYSC_xCPARTL_OR_BITS | SYSC_xCPARTL_AND_BITS)) {
134                 lor1   = (old & SYSC_xCPARTL_OR_BITS)  >> SYSC_xCPARTL_OR_S;
135                 lor2   = (new & SYSC_xCPARTL_OR_BITS)  >> SYSC_xCPARTL_OR_S;
136                 land1  = (old & SYSC_xCPARTL_AND_BITS) >> SYSC_xCPARTL_AND_S;
137                 land2  = (new & SYSC_xCPARTL_AND_BITS) >> SYSC_xCPARTL_AND_S;
138                 pr_cont(" L:%#x+%#x->%#x+%#x",
139                         (lor1 * sz) >> 4,
140                         ((land1 + 1) * sz) >> 4,
141                         (lor2 * sz) >> 4,
142                         ((land2 + 1) * sz) >> 4);
143         }
144         if (diff & (SYSC_xCPARTG_OR_BITS | SYSC_xCPARTG_AND_BITS)) {
145                 gor1   = (old & SYSC_xCPARTG_OR_BITS)  >> SYSC_xCPARTG_OR_S;
146                 gor2   = (new & SYSC_xCPARTG_OR_BITS)  >> SYSC_xCPARTG_OR_S;
147                 gand1  = (old & SYSC_xCPARTG_AND_BITS) >> SYSC_xCPARTG_AND_S;
148                 gand2  = (new & SYSC_xCPARTG_AND_BITS) >> SYSC_xCPARTG_AND_S;
149                 pr_cont(" G:%#x+%#x->%#x+%#x",
150                         (gor1 * sz) >> 4,
151                         ((gand1 + 1) * sz) >> 4,
152                         (gor2 * sz) >> 4,
153                         ((gand2 + 1) * sz) >> 4);
154         }
155         if (diff & SYSC_CWRMODE_BIT)
156                 pr_cont(" %sWR",
157                         (new & SYSC_CWRMODE_BIT) ? "+" : "-");
158         if (diff & SYSC_DCPART_GCON_BIT)
159                 pr_cont(" %sGCOn",
160                         (new & SYSC_DCPART_GCON_BIT) ? "+" : "-");
161         pr_cont("\n");
162 }
163 
164 /**
165  * setup_smp_cache: ensure cache coherency for new SMP thread.
166  * @thread:     New hardware thread number.
167  *
168  * Ensures that coherency is enabled and that the threads share the same cache
169  * partitions.
170  */
171 static void setup_smp_cache(unsigned int thread)
172 {
173         unsigned int this_thread, lflags;
174         unsigned int dcsz, dcpart_this, dcpart_old, dcpart_new;
175         unsigned int icsz, icpart_old, icpart_new;
176 
177         /*
178          * Copy over the current thread's cache partition configuration to the
179          * new thread so that they share cache partitions.
180          */
181         __global_lock2(lflags);
182         this_thread = hard_processor_id();
183         /* Share dcache partition */
184         dcpart_this = metag_in32(SYSC_DCPART(this_thread));
185         dcpart_old = metag_in32(SYSC_DCPART(thread));
186         dcpart_new = dcpart_this;
187 #if PAGE_OFFSET < LINGLOBAL_BASE
188         /*
189          * For the local data cache to be coherent the threads must also have
190          * GCOn enabled.
191          */
192         dcpart_new |= SYSC_DCPART_GCON_BIT;
193         metag_out32(dcpart_new, SYSC_DCPART(this_thread));
194 #endif
195         metag_out32(dcpart_new, SYSC_DCPART(thread));
196         /* Share icache partition too */
197         icpart_new = metag_in32(SYSC_ICPART(this_thread));
198         icpart_old = metag_in32(SYSC_ICPART(thread));
199         metag_out32(icpart_new, SYSC_ICPART(thread));
200         __global_unlock2(lflags);
201 
202         /*
203          * Log if the cache partitions were altered so the user is aware of any
204          * potential unintentional cache wastage.
205          */
206         dcsz = get_dcache_size();
207         icsz = get_dcache_size();
208         describe_cachepart_change(this_thread, "dcache", dcsz,
209                                   dcpart_this, dcpart_new);
210         describe_cachepart_change(thread, "dcache", dcsz,
211                                   dcpart_old, dcpart_new);
212         describe_cachepart_change(thread, "icache", icsz,
213                                   icpart_old, icpart_new);
214 }
215 
216 int __cpu_up(unsigned int cpu, struct task_struct *idle)
217 {
218         unsigned int thread = cpu_2_hwthread_id[cpu];
219         int ret;
220 
221         load_pgd(swapper_pg_dir, thread);
222 
223         flush_tlb_all();
224 
225         setup_smp_cache(thread);
226 
227         /*
228          * Tell the secondary CPU where to find its idle thread's stack.
229          */
230         secondary_data_stack = task_stack_page(idle);
231 
232         wmb();
233 
234         /*
235          * Now bring the CPU into our world.
236          */
237         ret = boot_secondary(thread, idle);
238         if (ret == 0) {
239                 /*
240                  * CPU was successfully started, wait for it
241                  * to come online or time out.
242                  */
243                 wait_for_completion_timeout(&cpu_running,
244                                             msecs_to_jiffies(1000));
245 
246                 if (!cpu_online(cpu))
247                         ret = -EIO;
248         }
249 
250         secondary_data_stack = NULL;
251 
252         if (ret) {
253                 pr_crit("CPU%u: processor failed to boot\n", cpu);
254 
255                 /*
256                  * FIXME: We need to clean up the new idle thread. --rmk
257                  */
258         }
259 
260         return ret;
261 }
262 
263 #ifdef CONFIG_HOTPLUG_CPU
264 static DECLARE_COMPLETION(cpu_killed);
265 
266 /*
267  * __cpu_disable runs on the processor to be shutdown.
268  */
269 int __cpu_disable(void)
270 {
271         unsigned int cpu = smp_processor_id();
272 
273         /*
274          * Take this CPU offline.  Once we clear this, we can't return,
275          * and we must not schedule until we're ready to give up the cpu.
276          */
277         set_cpu_online(cpu, false);
278 
279         /*
280          * OK - migrate IRQs away from this CPU
281          */
282         migrate_irqs();
283 
284         /*
285          * Flush user cache and TLB mappings, and then remove this CPU
286          * from the vm mask set of all processes.
287          */
288         flush_cache_all();
289         local_flush_tlb_all();
290 
291         clear_tasks_mm_cpumask(cpu);
292 
293         return 0;
294 }
295 
296 /*
297  * called on the thread which is asking for a CPU to be shutdown -
298  * waits until shutdown has completed, or it is timed out.
299  */
300 void __cpu_die(unsigned int cpu)
301 {
302         if (!wait_for_completion_timeout(&cpu_killed, msecs_to_jiffies(1)))
303                 pr_err("CPU%u: unable to kill\n", cpu);
304 }
305 
306 /*
307  * Called from the idle thread for the CPU which has been shutdown.
308  *
309  * Note that we do not return from this function. If this cpu is
310  * brought online again it will need to run secondary_startup().
311  */
312 void cpu_die(void)
313 {
314         local_irq_disable();
315         idle_task_exit();
316 
317         complete(&cpu_killed);
318 
319         asm ("XOR       TXENABLE, D0Re0,D0Re0\n");
320 }
321 #endif /* CONFIG_HOTPLUG_CPU */
322 
323 /*
324  * Called by both boot and secondaries to move global data into
325  * per-processor storage.
326  */
327 void smp_store_cpu_info(unsigned int cpuid)
328 {
329         struct cpuinfo_metag *cpu_info = &per_cpu(cpu_data, cpuid);
330 
331         cpu_info->loops_per_jiffy = loops_per_jiffy;
332 }
333 
334 /*
335  * This is the secondary CPU boot entry.  We're using this CPUs
336  * idle thread stack and the global page tables.
337  */
338 asmlinkage void secondary_start_kernel(void)
339 {
340         struct mm_struct *mm = &init_mm;
341         unsigned int cpu = smp_processor_id();
342 
343         /*
344          * All kernel threads share the same mm context; grab a
345          * reference and switch to it.
346          */
347         atomic_inc(&mm->mm_users);
348         atomic_inc(&mm->mm_count);
349         current->active_mm = mm;
350         cpumask_set_cpu(cpu, mm_cpumask(mm));
351         enter_lazy_tlb(mm, current);
352         local_flush_tlb_all();
353 
354         /*
355          * TODO: Some day it might be useful for each Linux CPU to
356          * have its own TBI structure. That would allow each Linux CPU
357          * to run different interrupt handlers for the same IRQ
358          * number.
359          *
360          * For now, simply copying the pointer to the boot CPU's TBI
361          * structure is sufficient because we always want to run the
362          * same interrupt handler whatever CPU takes the interrupt.
363          */
364         per_cpu(pTBI, cpu) = __TBI(TBID_ISTAT_BIT);
365 
366         if (!per_cpu(pTBI, cpu))
367                 panic("No TBI found!");
368 
369         per_cpu_trap_init(cpu);
370 
371         preempt_disable();
372 
373         setup_priv();
374 
375         notify_cpu_starting(cpu);
376 
377         pr_info("CPU%u (thread %u): Booted secondary processor\n",
378                 cpu, cpu_2_hwthread_id[cpu]);
379 
380         calibrate_delay();
381         smp_store_cpu_info(cpu);
382 
383         /*
384          * OK, now it's safe to let the boot CPU continue
385          */
386         set_cpu_online(cpu, true);
387         complete(&cpu_running);
388 
389         /*
390          * Enable local interrupts.
391          */
392         tbi_startup_interrupt(TBID_SIGNUM_TRT);
393         local_irq_enable();
394 
395         /*
396          * OK, it's off to the idle thread for us
397          */
398         cpu_startup_entry(CPUHP_ONLINE);
399 }
400 
401 void __init smp_cpus_done(unsigned int max_cpus)
402 {
403         int cpu;
404         unsigned long bogosum = 0;
405 
406         for_each_online_cpu(cpu)
407                 bogosum += per_cpu(cpu_data, cpu).loops_per_jiffy;
408 
409         pr_info("SMP: Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
410                 num_online_cpus(),
411                 bogosum / (500000/HZ),
412                 (bogosum / (5000/HZ)) % 100);
413 }
414 
415 void __init smp_prepare_cpus(unsigned int max_cpus)
416 {
417         unsigned int cpu = smp_processor_id();
418 
419         init_new_context(current, &init_mm);
420         current_thread_info()->cpu = cpu;
421 
422         smp_store_cpu_info(cpu);
423         init_cpu_present(cpu_possible_mask);
424 }
425 
426 void __init smp_prepare_boot_cpu(void)
427 {
428         unsigned int cpu = smp_processor_id();
429 
430         per_cpu(pTBI, cpu) = __TBI(TBID_ISTAT_BIT);
431 
432         if (!per_cpu(pTBI, cpu))
433                 panic("No TBI found!");
434 }
435 
436 static void smp_cross_call(cpumask_t callmap, enum ipi_msg_type msg);
437 
438 static void send_ipi_message(const struct cpumask *mask, enum ipi_msg_type msg)
439 {
440         unsigned long flags;
441         unsigned int cpu;
442         cpumask_t map;
443 
444         cpumask_clear(&map);
445         local_irq_save(flags);
446 
447         for_each_cpu(cpu, mask) {
448                 struct ipi_data *ipi = &per_cpu(ipi_data, cpu);
449 
450                 spin_lock(&ipi->lock);
451 
452                 /*
453                  * KICK interrupts are queued in hardware so we'll get
454                  * multiple interrupts if we call smp_cross_call()
455                  * multiple times for one msg. The problem is that we
456                  * only have one bit for each message - we can't queue
457                  * them in software.
458                  *
459                  * The first time through ipi_handler() we'll clear
460                  * the msg bit, having done all the work. But when we
461                  * return we'll get _another_ interrupt (and another,
462                  * and another until we've handled all the queued
463                  * KICKs). Running ipi_handler() when there's no work
464                  * to do is bad because that's how kick handler
465                  * chaining detects who the KICK was intended for.
466                  * See arch/metag/kernel/kick.c for more details.
467                  *
468                  * So only add 'cpu' to 'map' if we haven't already
469                  * queued a KICK interrupt for 'msg'.
470                  */
471                 if (!(ipi->bits & (1 << msg))) {
472                         ipi->bits |= 1 << msg;
473                         cpumask_set_cpu(cpu, &map);
474                 }
475 
476                 spin_unlock(&ipi->lock);
477         }
478 
479         /*
480          * Call the platform specific cross-CPU call function.
481          */
482         smp_cross_call(map, msg);
483 
484         local_irq_restore(flags);
485 }
486 
487 void arch_send_call_function_ipi_mask(const struct cpumask *mask)
488 {
489         send_ipi_message(mask, IPI_CALL_FUNC);
490 }
491 
492 void arch_send_call_function_single_ipi(int cpu)
493 {
494         send_ipi_message(cpumask_of(cpu), IPI_CALL_FUNC);
495 }
496 
497 void show_ipi_list(struct seq_file *p)
498 {
499         unsigned int cpu;
500 
501         seq_puts(p, "IPI:");
502 
503         for_each_present_cpu(cpu)
504                 seq_printf(p, " %10lu", per_cpu(ipi_data, cpu).ipi_count);
505 
506         seq_putc(p, '\n');
507 }
508 
509 static DEFINE_SPINLOCK(stop_lock);
510 
511 /*
512  * Main handler for inter-processor interrupts
513  *
514  * For Meta, the ipimask now only identifies a single
515  * category of IPI (Bit 1 IPIs have been replaced by a
516  * different mechanism):
517  *
518  *  Bit 0 - Inter-processor function call
519  */
520 static int do_IPI(void)
521 {
522         unsigned int cpu = smp_processor_id();
523         struct ipi_data *ipi = &per_cpu(ipi_data, cpu);
524         unsigned long msgs, nextmsg;
525         int handled = 0;
526 
527         ipi->ipi_count++;
528 
529         spin_lock(&ipi->lock);
530         msgs = ipi->bits;
531         nextmsg = msgs & -msgs;
532         ipi->bits &= ~nextmsg;
533         spin_unlock(&ipi->lock);
534 
535         if (nextmsg) {
536                 handled = 1;
537 
538                 nextmsg = ffz(~nextmsg);
539                 switch (nextmsg) {
540                 case IPI_RESCHEDULE:
541                         scheduler_ipi();
542                         break;
543 
544                 case IPI_CALL_FUNC:
545                         generic_smp_call_function_interrupt();
546                         break;
547 
548                 default:
549                         pr_crit("CPU%u: Unknown IPI message 0x%lx\n",
550                                 cpu, nextmsg);
551                         break;
552                 }
553         }
554 
555         return handled;
556 }
557 
558 void smp_send_reschedule(int cpu)
559 {
560         send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE);
561 }
562 
563 static void stop_this_cpu(void *data)
564 {
565         unsigned int cpu = smp_processor_id();
566 
567         if (system_state == SYSTEM_BOOTING ||
568             system_state == SYSTEM_RUNNING) {
569                 spin_lock(&stop_lock);
570                 pr_crit("CPU%u: stopping\n", cpu);
571                 dump_stack();
572                 spin_unlock(&stop_lock);
573         }
574 
575         set_cpu_online(cpu, false);
576 
577         local_irq_disable();
578 
579         hard_processor_halt(HALT_OK);
580 }
581 
582 void smp_send_stop(void)
583 {
584         smp_call_function(stop_this_cpu, NULL, 0);
585 }
586 
587 /*
588  * not supported here
589  */
590 int setup_profiling_timer(unsigned int multiplier)
591 {
592         return -EINVAL;
593 }
594 
595 /*
596  * We use KICKs for inter-processor interrupts.
597  *
598  * For every CPU in "callmap" the IPI data must already have been
599  * stored in that CPU's "ipi_data" member prior to calling this
600  * function.
601  */
602 static void kick_raise_softirq(cpumask_t callmap, unsigned int irq)
603 {
604         int cpu;
605 
606         for_each_cpu(cpu, &callmap) {
607                 unsigned int thread;
608 
609                 thread = cpu_2_hwthread_id[cpu];
610 
611                 BUG_ON(thread == BAD_HWTHREAD_ID);
612 
613                 metag_out32(1, T0KICKI + (thread * TnXKICK_STRIDE));
614         }
615 }
616 
617 static TBIRES ipi_handler(TBIRES State, int SigNum, int Triggers,
618                    int Inst, PTBI pTBI, int *handled)
619 {
620         *handled = do_IPI();
621 
622         return State;
623 }
624 
625 static struct kick_irq_handler ipi_irq = {
626         .func = ipi_handler,
627 };
628 
629 static void smp_cross_call(cpumask_t callmap, enum ipi_msg_type msg)
630 {
631         kick_raise_softirq(callmap, 1);
632 }
633 
634 static inline unsigned int get_core_count(void)
635 {
636         int i;
637         unsigned int ret = 0;
638 
639         for (i = 0; i < CONFIG_NR_CPUS; i++) {
640                 if (core_reg_read(TXUCT_ID, TXENABLE_REGNUM, i))
641                         ret++;
642         }
643 
644         return ret;
645 }
646 
647 /*
648  * Initialise the CPU possible map early - this describes the CPUs
649  * which may be present or become present in the system.
650  */
651 void __init smp_init_cpus(void)
652 {
653         unsigned int i, ncores = get_core_count();
654 
655         /* If no hwthread_map early param was set use default mapping */
656         for (i = 0; i < NR_CPUS; i++)
657                 if (cpu_2_hwthread_id[i] == BAD_HWTHREAD_ID) {
658                         cpu_2_hwthread_id[i] = i;
659                         hwthread_id_2_cpu[i] = i;
660                 }
661 
662         for (i = 0; i < ncores; i++)
663                 set_cpu_possible(i, true);
664 
665         kick_register_func(&ipi_irq);
666 }
667 

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