Commit | Line | Data |
---|---|---|
e54f8548 | 1 | /* Sparc SS1000/SC2000 SMP support. |
1da177e4 LT |
2 | * |
3 | * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
4 | * | |
5 | * Based on sun4m's smp.c, which is: | |
6 | * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) | |
7 | */ | |
8 | ||
1da177e4 | 9 | #include <linux/interrupt.h> |
1da177e4 | 10 | #include <linux/profile.h> |
6c81c32f | 11 | #include <linux/delay.h> |
4245e59d | 12 | #include <linux/cpu.h> |
1da177e4 | 13 | |
1da177e4 | 14 | #include <asm/sbi.h> |
e54f8548 | 15 | #include <asm/mmu.h> |
1da177e4 | 16 | #include <asm/tlbflush.h> |
bde4d8b2 | 17 | #include <asm/switch_to.h> |
1da177e4 | 18 | #include <asm/cacheflush.h> |
1da177e4 | 19 | |
e54f8548 | 20 | #include "kernel.h" |
32231a66 | 21 | #include "irq.h" |
1da177e4 | 22 | |
e54f8548 | 23 | #define IRQ_CROSS_CALL 15 |
1da177e4 | 24 | |
e54f8548 | 25 | static volatile int smp_processors_ready; |
1da177e4 | 26 | static int smp_highest_cpu; |
1da177e4 | 27 | |
a638f25a | 28 | static inline unsigned long sun4d_swap(volatile unsigned long *ptr, unsigned long val) |
1da177e4 LT |
29 | { |
30 | __asm__ __volatile__("swap [%1], %0\n\t" : | |
31 | "=&r" (val), "=&r" (ptr) : | |
32 | "0" (val), "1" (ptr)); | |
33 | return val; | |
34 | } | |
35 | ||
55dd23ec | 36 | static void smp4d_ipi_init(void); |
1da177e4 | 37 | static void smp_setup_percpu_timer(void); |
1da177e4 | 38 | |
7b1af32f DM |
39 | static unsigned char cpu_leds[32]; |
40 | ||
41 | static inline void show_leds(int cpuid) | |
42 | { | |
43 | cpuid &= 0x1e; | |
44 | __asm__ __volatile__ ("stba %0, [%1] %2" : : | |
45 | "r" ((cpu_leds[cpuid] << 4) | cpu_leds[cpuid+1]), | |
46 | "r" (ECSR_BASE(cpuid) | BB_LEDS), | |
47 | "i" (ASI_M_CTL)); | |
48 | } | |
49 | ||
409832f5 | 50 | void __cpuinit smp4d_callin(void) |
1da177e4 LT |
51 | { |
52 | int cpuid = hard_smp4d_processor_id(); | |
1da177e4 | 53 | unsigned long flags; |
e54f8548 | 54 | |
1da177e4 LT |
55 | /* Show we are alive */ |
56 | cpu_leds[cpuid] = 0x6; | |
57 | show_leds(cpuid); | |
58 | ||
59 | /* Enable level15 interrupt, disable level14 interrupt for now */ | |
60 | cc_set_imsk((cc_get_imsk() & ~0x8000) | 0x4000); | |
61 | ||
62 | local_flush_cache_all(); | |
63 | local_flush_tlb_all(); | |
64 | ||
e545a614 | 65 | notify_cpu_starting(cpuid); |
1da177e4 LT |
66 | /* |
67 | * Unblock the master CPU _only_ when the scheduler state | |
68 | * of all secondary CPUs will be up-to-date, so after | |
69 | * the SMP initialization the master will be just allowed | |
70 | * to call the scheduler code. | |
71 | */ | |
72 | /* Get our local ticker going. */ | |
73 | smp_setup_percpu_timer(); | |
74 | ||
75 | calibrate_delay(); | |
76 | smp_store_cpu_info(cpuid); | |
77 | local_flush_cache_all(); | |
78 | local_flush_tlb_all(); | |
79 | ||
80 | /* Allow master to continue. */ | |
a638f25a | 81 | sun4d_swap((unsigned long *)&cpu_callin_map[cpuid], 1); |
1da177e4 LT |
82 | local_flush_cache_all(); |
83 | local_flush_tlb_all(); | |
e54f8548 | 84 | |
e54f8548 | 85 | while ((unsigned long)current_set[cpuid] < PAGE_OFFSET) |
1da177e4 | 86 | barrier(); |
e54f8548 SR |
87 | |
88 | while (current_set[cpuid]->cpu != cpuid) | |
1da177e4 | 89 | barrier(); |
e54f8548 | 90 | |
1da177e4 LT |
91 | /* Fix idle thread fields. */ |
92 | __asm__ __volatile__("ld [%0], %%g6\n\t" | |
93 | : : "r" (¤t_set[cpuid]) | |
94 | : "memory" /* paranoid */); | |
95 | ||
96 | cpu_leds[cpuid] = 0x9; | |
97 | show_leds(cpuid); | |
e54f8548 | 98 | |
1da177e4 LT |
99 | /* Attach to the address space of init_task. */ |
100 | atomic_inc(&init_mm.mm_count); | |
101 | current->active_mm = &init_mm; | |
102 | ||
103 | local_flush_cache_all(); | |
104 | local_flush_tlb_all(); | |
e54f8548 | 105 | |
1da177e4 | 106 | local_irq_enable(); /* We don't allow PIL 14 yet */ |
e54f8548 | 107 | |
fb1fece5 | 108 | while (!cpumask_test_cpu(cpuid, &smp_commenced_mask)) |
1da177e4 LT |
109 | barrier(); |
110 | ||
111 | spin_lock_irqsave(&sun4d_imsk_lock, flags); | |
112 | cc_set_imsk(cc_get_imsk() & ~0x4000); /* Allow PIL 14 as well */ | |
113 | spin_unlock_irqrestore(&sun4d_imsk_lock, flags); | |
fe73971c | 114 | set_cpu_online(cpuid, true); |
8b3c848c | 115 | |
1da177e4 LT |
116 | } |
117 | ||
1da177e4 LT |
118 | /* |
119 | * Cycle through the processors asking the PROM to start each one. | |
120 | */ | |
1da177e4 LT |
121 | void __init smp4d_boot_cpus(void) |
122 | { | |
55dd23ec | 123 | smp4d_ipi_init(); |
1da177e4 LT |
124 | if (boot_cpu_id) |
125 | current_set[0] = NULL; | |
1da177e4 LT |
126 | smp_setup_percpu_timer(); |
127 | local_flush_cache_all(); | |
8b3c848c RB |
128 | } |
129 | ||
f0a2bc7e | 130 | int __cpuinit smp4d_boot_one_cpu(int i, struct task_struct *idle) |
8b3c848c | 131 | { |
e54f8548 | 132 | unsigned long *entry = &sun4d_cpu_startup; |
e54f8548 SR |
133 | int timeout; |
134 | int cpu_node; | |
1da177e4 | 135 | |
e54f8548 | 136 | cpu_find_by_instance(i, &cpu_node, NULL); |
f0a2bc7e | 137 | current_set[i] = task_thread_info(idle); |
e54f8548 SR |
138 | /* |
139 | * Initialize the contexts table | |
140 | * Since the call to prom_startcpu() trashes the structure, | |
141 | * we need to re-initialize it for each cpu | |
142 | */ | |
143 | smp_penguin_ctable.which_io = 0; | |
144 | smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys; | |
145 | smp_penguin_ctable.reg_size = 0; | |
146 | ||
147 | /* whirrr, whirrr, whirrrrrrrrr... */ | |
148 | printk(KERN_INFO "Starting CPU %d at %p\n", i, entry); | |
149 | local_flush_cache_all(); | |
150 | prom_startcpu(cpu_node, | |
151 | &smp_penguin_ctable, 0, (char *)entry); | |
152 | ||
153 | printk(KERN_INFO "prom_startcpu returned :)\n"); | |
154 | ||
155 | /* wheee... it's going... */ | |
156 | for (timeout = 0; timeout < 10000; timeout++) { | |
157 | if (cpu_callin_map[i]) | |
158 | break; | |
159 | udelay(200); | |
160 | } | |
1da177e4 | 161 | |
8b3c848c | 162 | if (!(cpu_callin_map[i])) { |
e54f8548 | 163 | printk(KERN_ERR "Processor %d is stuck.\n", i); |
8b3c848c RB |
164 | return -ENODEV; |
165 | ||
1da177e4 LT |
166 | } |
167 | local_flush_cache_all(); | |
8b3c848c RB |
168 | return 0; |
169 | } | |
170 | ||
171 | void __init smp4d_smp_done(void) | |
172 | { | |
173 | int i, first; | |
174 | int *prev; | |
175 | ||
176 | /* setup cpu list for irq rotation */ | |
177 | first = 0; | |
178 | prev = &first; | |
ec7c14bd RR |
179 | for_each_online_cpu(i) { |
180 | *prev = i; | |
181 | prev = &cpu_data(i).next; | |
182 | } | |
8b3c848c RB |
183 | *prev = first; |
184 | local_flush_cache_all(); | |
1da177e4 | 185 | |
1da177e4 LT |
186 | /* Ok, they are spinning and ready to go. */ |
187 | smp_processors_ready = 1; | |
188 | sun4d_distribute_irqs(); | |
189 | } | |
190 | ||
55dd23ec DH |
191 | /* Memory structure giving interrupt handler information about IPI generated */ |
192 | struct sun4d_ipi_work { | |
193 | int single; | |
194 | int msk; | |
195 | int resched; | |
196 | }; | |
197 | ||
198 | static DEFINE_PER_CPU_SHARED_ALIGNED(struct sun4d_ipi_work, sun4d_ipi_work); | |
199 | ||
200 | /* Initialize IPIs on the SUN4D SMP machine */ | |
201 | static void __init smp4d_ipi_init(void) | |
202 | { | |
203 | int cpu; | |
204 | struct sun4d_ipi_work *work; | |
205 | ||
206 | printk(KERN_INFO "smp4d: setup IPI at IRQ %d\n", SUN4D_IPI_IRQ); | |
207 | ||
208 | for_each_possible_cpu(cpu) { | |
209 | work = &per_cpu(sun4d_ipi_work, cpu); | |
210 | work->single = work->msk = work->resched = 0; | |
211 | } | |
212 | } | |
213 | ||
214 | void sun4d_ipi_interrupt(void) | |
215 | { | |
216 | struct sun4d_ipi_work *work = &__get_cpu_var(sun4d_ipi_work); | |
217 | ||
218 | if (work->single) { | |
219 | work->single = 0; | |
220 | smp_call_function_single_interrupt(); | |
221 | } | |
222 | if (work->msk) { | |
223 | work->msk = 0; | |
224 | smp_call_function_interrupt(); | |
225 | } | |
226 | if (work->resched) { | |
227 | work->resched = 0; | |
228 | smp_resched_interrupt(); | |
229 | } | |
230 | } | |
231 | ||
232 | static void smp4d_ipi_single(int cpu) | |
233 | { | |
234 | struct sun4d_ipi_work *work = &per_cpu(sun4d_ipi_work, cpu); | |
235 | ||
236 | /* Mark work */ | |
237 | work->single = 1; | |
238 | ||
239 | /* Generate IRQ on the CPU */ | |
240 | sun4d_send_ipi(cpu, SUN4D_IPI_IRQ); | |
241 | } | |
242 | ||
243 | static void smp4d_ipi_mask_one(int cpu) | |
244 | { | |
245 | struct sun4d_ipi_work *work = &per_cpu(sun4d_ipi_work, cpu); | |
246 | ||
247 | /* Mark work */ | |
248 | work->msk = 1; | |
249 | ||
250 | /* Generate IRQ on the CPU */ | |
251 | sun4d_send_ipi(cpu, SUN4D_IPI_IRQ); | |
252 | } | |
253 | ||
254 | static void smp4d_ipi_resched(int cpu) | |
255 | { | |
256 | struct sun4d_ipi_work *work = &per_cpu(sun4d_ipi_work, cpu); | |
257 | ||
258 | /* Mark work */ | |
259 | work->resched = 1; | |
260 | ||
261 | /* Generate IRQ on the CPU (any IRQ will cause resched) */ | |
262 | sun4d_send_ipi(cpu, SUN4D_IPI_IRQ); | |
263 | } | |
264 | ||
1da177e4 LT |
265 | static struct smp_funcall { |
266 | smpfunc_t func; | |
267 | unsigned long arg1; | |
268 | unsigned long arg2; | |
269 | unsigned long arg3; | |
270 | unsigned long arg4; | |
271 | unsigned long arg5; | |
272 | unsigned char processors_in[NR_CPUS]; /* Set when ipi entered. */ | |
273 | unsigned char processors_out[NR_CPUS]; /* Set when ipi exited. */ | |
274 | } ccall_info __attribute__((aligned(8))); | |
275 | ||
276 | static DEFINE_SPINLOCK(cross_call_lock); | |
277 | ||
278 | /* Cross calls must be serialized, at least currently. */ | |
66e4f8c0 DM |
279 | static void smp4d_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1, |
280 | unsigned long arg2, unsigned long arg3, | |
281 | unsigned long arg4) | |
1da177e4 | 282 | { |
e54f8548 | 283 | if (smp_processors_ready) { |
1da177e4 LT |
284 | register int high = smp_highest_cpu; |
285 | unsigned long flags; | |
286 | ||
287 | spin_lock_irqsave(&cross_call_lock, flags); | |
288 | ||
289 | { | |
e54f8548 SR |
290 | /* |
291 | * If you make changes here, make sure | |
292 | * gcc generates proper code... | |
293 | */ | |
1da177e4 LT |
294 | register smpfunc_t f asm("i0") = func; |
295 | register unsigned long a1 asm("i1") = arg1; | |
296 | register unsigned long a2 asm("i2") = arg2; | |
297 | register unsigned long a3 asm("i3") = arg3; | |
298 | register unsigned long a4 asm("i4") = arg4; | |
66e4f8c0 | 299 | register unsigned long a5 asm("i5") = 0; |
1da177e4 LT |
300 | |
301 | __asm__ __volatile__( | |
302 | "std %0, [%6]\n\t" | |
303 | "std %2, [%6 + 8]\n\t" | |
304 | "std %4, [%6 + 16]\n\t" : : | |
305 | "r"(f), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5), | |
306 | "r" (&ccall_info.func)); | |
307 | } | |
308 | ||
309 | /* Init receive/complete mapping, plus fire the IPI's off. */ | |
310 | { | |
1da177e4 LT |
311 | register int i; |
312 | ||
fb1fece5 KM |
313 | cpumask_clear_cpu(smp_processor_id(), &mask); |
314 | cpumask_and(&mask, cpu_online_mask, &mask); | |
e54f8548 | 315 | for (i = 0; i <= high; i++) { |
fb1fece5 | 316 | if (cpumask_test_cpu(i, &mask)) { |
1da177e4 LT |
317 | ccall_info.processors_in[i] = 0; |
318 | ccall_info.processors_out[i] = 0; | |
319 | sun4d_send_ipi(i, IRQ_CROSS_CALL); | |
320 | } | |
321 | } | |
322 | } | |
323 | ||
324 | { | |
325 | register int i; | |
326 | ||
327 | i = 0; | |
328 | do { | |
fb1fece5 | 329 | if (!cpumask_test_cpu(i, &mask)) |
66e4f8c0 | 330 | continue; |
e54f8548 | 331 | while (!ccall_info.processors_in[i]) |
1da177e4 | 332 | barrier(); |
e54f8548 | 333 | } while (++i <= high); |
1da177e4 LT |
334 | |
335 | i = 0; | |
336 | do { | |
fb1fece5 | 337 | if (!cpumask_test_cpu(i, &mask)) |
66e4f8c0 | 338 | continue; |
e54f8548 | 339 | while (!ccall_info.processors_out[i]) |
1da177e4 | 340 | barrier(); |
e54f8548 | 341 | } while (++i <= high); |
1da177e4 LT |
342 | } |
343 | ||
344 | spin_unlock_irqrestore(&cross_call_lock, flags); | |
345 | } | |
346 | } | |
347 | ||
348 | /* Running cross calls. */ | |
349 | void smp4d_cross_call_irq(void) | |
350 | { | |
351 | int i = hard_smp4d_processor_id(); | |
352 | ||
353 | ccall_info.processors_in[i] = 1; | |
354 | ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3, | |
355 | ccall_info.arg4, ccall_info.arg5); | |
356 | ccall_info.processors_out[i] = 1; | |
357 | } | |
358 | ||
1da177e4 LT |
359 | void smp4d_percpu_timer_interrupt(struct pt_regs *regs) |
360 | { | |
0d84438d | 361 | struct pt_regs *old_regs; |
1da177e4 LT |
362 | int cpu = hard_smp4d_processor_id(); |
363 | static int cpu_tick[NR_CPUS]; | |
364 | static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd }; | |
365 | ||
0d84438d | 366 | old_regs = set_irq_regs(regs); |
e54f8548 | 367 | bw_get_prof_limit(cpu); |
1da177e4 LT |
368 | bw_clear_intr_mask(0, 1); /* INTR_TABLE[0] & 1 is Profile IRQ */ |
369 | ||
370 | cpu_tick[cpu]++; | |
371 | if (!(cpu_tick[cpu] & 15)) { | |
372 | if (cpu_tick[cpu] == 0x60) | |
373 | cpu_tick[cpu] = 0; | |
374 | cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4]; | |
375 | show_leds(cpu); | |
376 | } | |
377 | ||
0d84438d | 378 | profile_tick(CPU_PROFILING); |
1da177e4 | 379 | |
e54f8548 | 380 | if (!--prof_counter(cpu)) { |
1da177e4 LT |
381 | int user = user_mode(regs); |
382 | ||
383 | irq_enter(); | |
384 | update_process_times(user); | |
385 | irq_exit(); | |
386 | ||
387 | prof_counter(cpu) = prof_multiplier(cpu); | |
388 | } | |
0d84438d | 389 | set_irq_regs(old_regs); |
1da177e4 LT |
390 | } |
391 | ||
409832f5 | 392 | static void __cpuinit smp_setup_percpu_timer(void) |
1da177e4 LT |
393 | { |
394 | int cpu = hard_smp4d_processor_id(); | |
395 | ||
396 | prof_counter(cpu) = prof_multiplier(cpu) = 1; | |
397 | load_profile_irq(cpu, lvl14_resolution); | |
398 | } | |
399 | ||
400 | void __init smp4d_blackbox_id(unsigned *addr) | |
401 | { | |
402 | int rd = *addr & 0x3e000000; | |
e54f8548 | 403 | |
1da177e4 | 404 | addr[0] = 0xc0800800 | rd; /* lda [%g0] ASI_M_VIKING_TMP1, reg */ |
e54f8548 SR |
405 | addr[1] = 0x01000000; /* nop */ |
406 | addr[2] = 0x01000000; /* nop */ | |
1da177e4 LT |
407 | } |
408 | ||
409 | void __init smp4d_blackbox_current(unsigned *addr) | |
410 | { | |
411 | int rd = *addr & 0x3e000000; | |
e54f8548 | 412 | |
1da177e4 LT |
413 | addr[0] = 0xc0800800 | rd; /* lda [%g0] ASI_M_VIKING_TMP1, reg */ |
414 | addr[2] = 0x81282002 | rd | (rd >> 11); /* sll reg, 2, reg */ | |
415 | addr[4] = 0x01000000; /* nop */ | |
416 | } | |
417 | ||
418 | void __init sun4d_init_smp(void) | |
419 | { | |
420 | int i; | |
1da177e4 LT |
421 | |
422 | /* Patch ipi15 trap table */ | |
423 | t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m); | |
e54f8548 | 424 | |
1da177e4 LT |
425 | /* And set btfixup... */ |
426 | BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4d_blackbox_id); | |
427 | BTFIXUPSET_BLACKBOX(load_current, smp4d_blackbox_current); | |
428 | BTFIXUPSET_CALL(smp_cross_call, smp4d_cross_call, BTFIXUPCALL_NORM); | |
1da177e4 | 429 | BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4d_processor_id, BTFIXUPCALL_NORM); |
55dd23ec DH |
430 | BTFIXUPSET_CALL(smp_ipi_resched, smp4d_ipi_resched, BTFIXUPCALL_NORM); |
431 | BTFIXUPSET_CALL(smp_ipi_single, smp4d_ipi_single, BTFIXUPCALL_NORM); | |
432 | BTFIXUPSET_CALL(smp_ipi_mask_one, smp4d_ipi_mask_one, BTFIXUPCALL_NORM); | |
e54f8548 | 433 | |
1da177e4 LT |
434 | for (i = 0; i < NR_CPUS; i++) { |
435 | ccall_info.processors_in[i] = 1; | |
436 | ccall_info.processors_out[i] = 1; | |
437 | } | |
438 | } |