1 /* leon_smp.c: Sparc-Leon SMP support.
2 *
3 * based on sun4m_smp.c
4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
6 * Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
7 */
8
9 #include <asm/head.h>
10
11 #include <linux/kernel.h>
12 #include <linux/sched.h>
13 #include <linux/threads.h>
14 #include <linux/smp.h>
15 #include <linux/interrupt.h>
16 #include <linux/kernel_stat.h>
17 #include <linux/of.h>
18 #include <linux/init.h>
19 #include <linux/spinlock.h>
20 #include <linux/mm.h>
21 #include <linux/swap.h>
22 #include <linux/profile.h>
23 #include <linux/pm.h>
24 #include <linux/delay.h>
25 #include <linux/gfp.h>
26 #include <linux/cpu.h>
27
28 #include <asm/cacheflush.h>
29 #include <asm/tlbflush.h>
30
31 #include <asm/ptrace.h>
32 #include <linux/atomic.h>
33 #include <asm/irq_regs.h>
34 #include <asm/traps.h>
35
36 #include <asm/delay.h>
37 #include <asm/irq.h>
38 #include <asm/page.h>
39 #include <asm/pgalloc.h>
40 #include <asm/pgtable.h>
41 #include <asm/oplib.h>
42 #include <asm/cpudata.h>
43 #include <asm/asi.h>
44 #include <asm/leon.h>
45 #include <asm/leon_amba.h>
46
47 #include "kernel.h"
48
49 #ifdef CONFIG_SPARC_LEON
50
51 #include "irq.h"
52
53 extern ctxd_t *srmmu_ctx_table_phys;
54 static int smp_processors_ready;
55 extern volatile unsigned long cpu_callin_map[NR_CPUS];
56 extern cpumask_t smp_commenced_mask;
57 void __init leon_configure_cache_smp(void);
58 static void leon_ipi_init(void);
59
60 /* IRQ number of LEON IPIs */
61 int leon_ipi_irq = LEON3_IRQ_IPI_DEFAULT;
62
do_swap(volatile unsigned long * ptr,unsigned long val)63 static inline unsigned long do_swap(volatile unsigned long *ptr,
64 unsigned long val)
65 {
66 __asm__ __volatile__("swapa [%2] %3, %0\n\t" : "=&r"(val)
67 : "0"(val), "r"(ptr), "i"(ASI_LEON_DCACHE_MISS)
68 : "memory");
69 return val;
70 }
71
72 static void smp_setup_percpu_timer(void);
73
leon_callin(void)74 void __cpuinit leon_callin(void)
75 {
76 int cpuid = hard_smpleon_processor_id();
77
78 local_flush_cache_all();
79 local_flush_tlb_all();
80 leon_configure_cache_smp();
81
82 notify_cpu_starting(cpuid);
83
84 /* Get our local ticker going. */
85 smp_setup_percpu_timer();
86
87 calibrate_delay();
88 smp_store_cpu_info(cpuid);
89
90 local_flush_cache_all();
91 local_flush_tlb_all();
92
93 /*
94 * Unblock the master CPU _only_ when the scheduler state
95 * of all secondary CPUs will be up-to-date, so after
96 * the SMP initialization the master will be just allowed
97 * to call the scheduler code.
98 * Allow master to continue.
99 */
100 do_swap(&cpu_callin_map[cpuid], 1);
101
102 local_flush_cache_all();
103 local_flush_tlb_all();
104
105 /* Fix idle thread fields. */
106 __asm__ __volatile__("ld [%0], %%g6\n\t" : : "r"(¤t_set[cpuid])
107 : "memory" /* paranoid */);
108
109 /* Attach to the address space of init_task. */
110 atomic_inc(&init_mm.mm_count);
111 current->active_mm = &init_mm;
112
113 while (!cpumask_test_cpu(cpuid, &smp_commenced_mask))
114 mb();
115
116 local_irq_enable();
117 set_cpu_online(cpuid, true);
118 }
119
120 /*
121 * Cycle through the processors asking the PROM to start each one.
122 */
123
124 extern struct linux_prom_registers smp_penguin_ctable;
125
leon_configure_cache_smp(void)126 void __init leon_configure_cache_smp(void)
127 {
128 unsigned long cfg = sparc_leon3_get_dcachecfg();
129 int me = smp_processor_id();
130
131 if (ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg) > 4) {
132 printk(KERN_INFO "Note: SMP with snooping only works on 4k cache, found %dk(0x%x) on cpu %d, disabling caches\n",
133 (unsigned int)ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg),
134 (unsigned int)cfg, (unsigned int)me);
135 sparc_leon3_disable_cache();
136 } else {
137 if (cfg & ASI_LEON3_SYSCTRL_CFG_SNOOPING) {
138 sparc_leon3_enable_snooping();
139 } else {
140 printk(KERN_INFO "Note: You have to enable snooping in the vhdl model cpu %d, disabling caches\n",
141 me);
142 sparc_leon3_disable_cache();
143 }
144 }
145
146 local_flush_cache_all();
147 local_flush_tlb_all();
148 }
149
leon_smp_setbroadcast(unsigned int mask)150 void leon_smp_setbroadcast(unsigned int mask)
151 {
152 int broadcast =
153 ((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
154 LEON3_IRQMPSTATUS_BROADCAST) & 1);
155 if (!broadcast) {
156 prom_printf("######## !!!! The irqmp-ctrl must have broadcast enabled, smp wont work !!!!! ####### nr cpus: %d\n",
157 leon_smp_nrcpus());
158 if (leon_smp_nrcpus() > 1) {
159 BUG();
160 } else {
161 prom_printf("continue anyway\n");
162 return;
163 }
164 }
165 LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpbroadcast), mask);
166 }
167
leon_smp_getbroadcast(void)168 unsigned int leon_smp_getbroadcast(void)
169 {
170 unsigned int mask;
171 mask = LEON_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpbroadcast));
172 return mask;
173 }
174
leon_smp_nrcpus(void)175 int leon_smp_nrcpus(void)
176 {
177 int nrcpu =
178 ((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
179 LEON3_IRQMPSTATUS_CPUNR) & 0xf) + 1;
180 return nrcpu;
181 }
182
leon_boot_cpus(void)183 void __init leon_boot_cpus(void)
184 {
185 int nrcpu = leon_smp_nrcpus();
186 int me = smp_processor_id();
187
188 /* Setup IPI */
189 leon_ipi_init();
190
191 printk(KERN_INFO "%d:(%d:%d) cpus mpirq at 0x%x\n", (unsigned int)me,
192 (unsigned int)nrcpu, (unsigned int)NR_CPUS,
193 (unsigned int)&(leon3_irqctrl_regs->mpstatus));
194
195 leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, me);
196 leon_enable_irq_cpu(LEON3_IRQ_TICKER, me);
197 leon_enable_irq_cpu(leon_ipi_irq, me);
198
199 leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER);
200
201 leon_configure_cache_smp();
202 smp_setup_percpu_timer();
203 local_flush_cache_all();
204
205 }
206
leon_boot_one_cpu(int i)207 int __cpuinit leon_boot_one_cpu(int i)
208 {
209
210 struct task_struct *p;
211 int timeout;
212
213 /* Cook up an idler for this guy. */
214 p = fork_idle(i);
215
216 current_set[i] = task_thread_info(p);
217
218 /* See trampoline.S:leon_smp_cpu_startup for details...
219 * Initialize the contexts table
220 * Since the call to prom_startcpu() trashes the structure,
221 * we need to re-initialize it for each cpu
222 */
223 smp_penguin_ctable.which_io = 0;
224 smp_penguin_ctable.phys_addr = (unsigned int)srmmu_ctx_table_phys;
225 smp_penguin_ctable.reg_size = 0;
226
227 /* whirrr, whirrr, whirrrrrrrrr... */
228 printk(KERN_INFO "Starting CPU %d : (irqmp: 0x%x)\n", (unsigned int)i,
229 (unsigned int)&leon3_irqctrl_regs->mpstatus);
230 local_flush_cache_all();
231
232 /* Make sure all IRQs are of from the start for this new CPU */
233 LEON_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[i], 0);
234
235 /* Wake one CPU */
236 LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpstatus), 1 << i);
237
238 /* wheee... it's going... */
239 for (timeout = 0; timeout < 10000; timeout++) {
240 if (cpu_callin_map[i])
241 break;
242 udelay(200);
243 }
244 printk(KERN_INFO "Started CPU %d\n", (unsigned int)i);
245
246 if (!(cpu_callin_map[i])) {
247 printk(KERN_ERR "Processor %d is stuck.\n", i);
248 return -ENODEV;
249 } else {
250 leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, i);
251 leon_enable_irq_cpu(LEON3_IRQ_TICKER, i);
252 leon_enable_irq_cpu(leon_ipi_irq, i);
253 }
254
255 local_flush_cache_all();
256 return 0;
257 }
258
leon_smp_done(void)259 void __init leon_smp_done(void)
260 {
261
262 int i, first;
263 int *prev;
264
265 /* setup cpu list for irq rotation */
266 first = 0;
267 prev = &first;
268 for (i = 0; i < NR_CPUS; i++) {
269 if (cpu_online(i)) {
270 *prev = i;
271 prev = &cpu_data(i).next;
272 }
273 }
274 *prev = first;
275 local_flush_cache_all();
276
277 /* Free unneeded trap tables */
278 if (!cpu_present(1)) {
279 ClearPageReserved(virt_to_page(&trapbase_cpu1));
280 init_page_count(virt_to_page(&trapbase_cpu1));
281 free_page((unsigned long)&trapbase_cpu1);
282 totalram_pages++;
283 num_physpages++;
284 }
285 if (!cpu_present(2)) {
286 ClearPageReserved(virt_to_page(&trapbase_cpu2));
287 init_page_count(virt_to_page(&trapbase_cpu2));
288 free_page((unsigned long)&trapbase_cpu2);
289 totalram_pages++;
290 num_physpages++;
291 }
292 if (!cpu_present(3)) {
293 ClearPageReserved(virt_to_page(&trapbase_cpu3));
294 init_page_count(virt_to_page(&trapbase_cpu3));
295 free_page((unsigned long)&trapbase_cpu3);
296 totalram_pages++;
297 num_physpages++;
298 }
299 /* Ok, they are spinning and ready to go. */
300 smp_processors_ready = 1;
301
302 }
303
leon_irq_rotate(int cpu)304 void leon_irq_rotate(int cpu)
305 {
306 }
307
308 struct leon_ipi_work {
309 int single;
310 int msk;
311 int resched;
312 };
313
314 static DEFINE_PER_CPU_SHARED_ALIGNED(struct leon_ipi_work, leon_ipi_work);
315
316 /* Initialize IPIs on the LEON, in order to save IRQ resources only one IRQ
317 * is used for all three types of IPIs.
318 */
leon_ipi_init(void)319 static void __init leon_ipi_init(void)
320 {
321 int cpu, len;
322 struct leon_ipi_work *work;
323 struct property *pp;
324 struct device_node *rootnp;
325 struct tt_entry *trap_table;
326 unsigned long flags;
327
328 /* Find IPI IRQ or stick with default value */
329 rootnp = of_find_node_by_path("/ambapp0");
330 if (rootnp) {
331 pp = of_find_property(rootnp, "ipi_num", &len);
332 if (pp && (*(int *)pp->value))
333 leon_ipi_irq = *(int *)pp->value;
334 }
335 printk(KERN_INFO "leon: SMP IPIs at IRQ %d\n", leon_ipi_irq);
336
337 /* Adjust so that we jump directly to smpleon_ipi */
338 local_irq_save(flags);
339 trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (leon_ipi_irq - 1)];
340 trap_table->inst_three += smpleon_ipi - real_irq_entry;
341 local_flush_cache_all();
342 local_irq_restore(flags);
343
344 for_each_possible_cpu(cpu) {
345 work = &per_cpu(leon_ipi_work, cpu);
346 work->single = work->msk = work->resched = 0;
347 }
348 }
349
leon_ipi_single(int cpu)350 static void leon_ipi_single(int cpu)
351 {
352 struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);
353
354 /* Mark work */
355 work->single = 1;
356
357 /* Generate IRQ on the CPU */
358 set_cpu_int(cpu, leon_ipi_irq);
359 }
360
leon_ipi_mask_one(int cpu)361 static void leon_ipi_mask_one(int cpu)
362 {
363 struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);
364
365 /* Mark work */
366 work->msk = 1;
367
368 /* Generate IRQ on the CPU */
369 set_cpu_int(cpu, leon_ipi_irq);
370 }
371
leon_ipi_resched(int cpu)372 static void leon_ipi_resched(int cpu)
373 {
374 struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);
375
376 /* Mark work */
377 work->resched = 1;
378
379 /* Generate IRQ on the CPU (any IRQ will cause resched) */
380 set_cpu_int(cpu, leon_ipi_irq);
381 }
382
leonsmp_ipi_interrupt(void)383 void leonsmp_ipi_interrupt(void)
384 {
385 struct leon_ipi_work *work = &__get_cpu_var(leon_ipi_work);
386
387 if (work->single) {
388 work->single = 0;
389 smp_call_function_single_interrupt();
390 }
391 if (work->msk) {
392 work->msk = 0;
393 smp_call_function_interrupt();
394 }
395 if (work->resched) {
396 work->resched = 0;
397 smp_resched_interrupt();
398 }
399 }
400
401 static struct smp_funcall {
402 smpfunc_t func;
403 unsigned long arg1;
404 unsigned long arg2;
405 unsigned long arg3;
406 unsigned long arg4;
407 unsigned long arg5;
408 unsigned long processors_in[NR_CPUS]; /* Set when ipi entered. */
409 unsigned long processors_out[NR_CPUS]; /* Set when ipi exited. */
410 } ccall_info;
411
412 static DEFINE_SPINLOCK(cross_call_lock);
413
414 /* Cross calls must be serialized, at least currently. */
leon_cross_call(smpfunc_t func,cpumask_t mask,unsigned long arg1,unsigned long arg2,unsigned long arg3,unsigned long arg4)415 static void leon_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
416 unsigned long arg2, unsigned long arg3,
417 unsigned long arg4)
418 {
419 if (smp_processors_ready) {
420 register int high = NR_CPUS - 1;
421 unsigned long flags;
422
423 spin_lock_irqsave(&cross_call_lock, flags);
424
425 {
426 /* If you make changes here, make sure gcc generates proper code... */
427 register smpfunc_t f asm("i0") = func;
428 register unsigned long a1 asm("i1") = arg1;
429 register unsigned long a2 asm("i2") = arg2;
430 register unsigned long a3 asm("i3") = arg3;
431 register unsigned long a4 asm("i4") = arg4;
432 register unsigned long a5 asm("i5") = 0;
433
434 __asm__ __volatile__("std %0, [%6]\n\t"
435 "std %2, [%6 + 8]\n\t"
436 "std %4, [%6 + 16]\n\t" : :
437 "r"(f), "r"(a1), "r"(a2), "r"(a3),
438 "r"(a4), "r"(a5),
439 "r"(&ccall_info.func));
440 }
441
442 /* Init receive/complete mapping, plus fire the IPI's off. */
443 {
444 register int i;
445
446 cpumask_clear_cpu(smp_processor_id(), &mask);
447 cpumask_and(&mask, cpu_online_mask, &mask);
448 for (i = 0; i <= high; i++) {
449 if (cpumask_test_cpu(i, &mask)) {
450 ccall_info.processors_in[i] = 0;
451 ccall_info.processors_out[i] = 0;
452 set_cpu_int(i, LEON3_IRQ_CROSS_CALL);
453
454 }
455 }
456 }
457
458 {
459 register int i;
460
461 i = 0;
462 do {
463 if (!cpumask_test_cpu(i, &mask))
464 continue;
465
466 while (!ccall_info.processors_in[i])
467 barrier();
468 } while (++i <= high);
469
470 i = 0;
471 do {
472 if (!cpumask_test_cpu(i, &mask))
473 continue;
474
475 while (!ccall_info.processors_out[i])
476 barrier();
477 } while (++i <= high);
478 }
479
480 spin_unlock_irqrestore(&cross_call_lock, flags);
481 }
482 }
483
484 /* Running cross calls. */
leon_cross_call_irq(void)485 void leon_cross_call_irq(void)
486 {
487 int i = smp_processor_id();
488
489 ccall_info.processors_in[i] = 1;
490 ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
491 ccall_info.arg4, ccall_info.arg5);
492 ccall_info.processors_out[i] = 1;
493 }
494
leon_percpu_timer_interrupt(int irq,void * unused)495 irqreturn_t leon_percpu_timer_interrupt(int irq, void *unused)
496 {
497 int cpu = smp_processor_id();
498
499 leon_clear_profile_irq(cpu);
500
501 profile_tick(CPU_PROFILING);
502
503 if (!--prof_counter(cpu)) {
504 int user = user_mode(get_irq_regs());
505
506 update_process_times(user);
507
508 prof_counter(cpu) = prof_multiplier(cpu);
509 }
510
511 return IRQ_HANDLED;
512 }
513
smp_setup_percpu_timer(void)514 static void __init smp_setup_percpu_timer(void)
515 {
516 int cpu = smp_processor_id();
517
518 prof_counter(cpu) = prof_multiplier(cpu) = 1;
519 }
520
leon_blackbox_id(unsigned * addr)521 void __init leon_blackbox_id(unsigned *addr)
522 {
523 int rd = *addr & 0x3e000000;
524 int rs1 = rd >> 11;
525
526 /* patch places where ___b_hard_smp_processor_id appears */
527 addr[0] = 0x81444000 | rd; /* rd %asr17, reg */
528 addr[1] = 0x8130201c | rd | rs1; /* srl reg, 0x1c, reg */
529 addr[2] = 0x01000000; /* nop */
530 }
531
leon_blackbox_current(unsigned * addr)532 void __init leon_blackbox_current(unsigned *addr)
533 {
534 int rd = *addr & 0x3e000000;
535 int rs1 = rd >> 11;
536
537 /* patch LOAD_CURRENT macro where ___b_load_current appears */
538 addr[0] = 0x81444000 | rd; /* rd %asr17, reg */
539 addr[2] = 0x8130201c | rd | rs1; /* srl reg, 0x1c, reg */
540 addr[4] = 0x81282002 | rd | rs1; /* sll reg, 0x2, reg */
541
542 }
543
leon_init_smp(void)544 void __init leon_init_smp(void)
545 {
546 /* Patch ipi15 trap table */
547 t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_leon - linux_trap_ipi15_sun4m);
548
549 BTFIXUPSET_BLACKBOX(hard_smp_processor_id, leon_blackbox_id);
550 BTFIXUPSET_BLACKBOX(load_current, leon_blackbox_current);
551 BTFIXUPSET_CALL(smp_cross_call, leon_cross_call, BTFIXUPCALL_NORM);
552 BTFIXUPSET_CALL(__hard_smp_processor_id, __leon_processor_id,
553 BTFIXUPCALL_NORM);
554 BTFIXUPSET_CALL(smp_ipi_resched, leon_ipi_resched, BTFIXUPCALL_NORM);
555 BTFIXUPSET_CALL(smp_ipi_single, leon_ipi_single, BTFIXUPCALL_NORM);
556 BTFIXUPSET_CALL(smp_ipi_mask_one, leon_ipi_mask_one, BTFIXUPCALL_NORM);
557 }
558
559 #endif /* CONFIG_SPARC_LEON */
560