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 | ||
62f08283 | 9 | #include <linux/clockchips.h> |
1da177e4 | 10 | #include <linux/interrupt.h> |
1da177e4 | 11 | #include <linux/profile.h> |
6c81c32f | 12 | #include <linux/delay.h> |
5d83d666 | 13 | #include <linux/sched.h> |
4245e59d | 14 | #include <linux/cpu.h> |
1da177e4 | 15 | |
62f08283 TK |
16 | #include <asm/cacheflush.h> |
17 | #include <asm/switch_to.h> | |
18 | #include <asm/tlbflush.h> | |
19 | #include <asm/timer.h> | |
5d83d666 | 20 | #include <asm/oplib.h> |
1da177e4 | 21 | #include <asm/sbi.h> |
e54f8548 | 22 | #include <asm/mmu.h> |
1da177e4 | 23 | |
e54f8548 | 24 | #include "kernel.h" |
32231a66 | 25 | #include "irq.h" |
1da177e4 | 26 | |
e54f8548 | 27 | #define IRQ_CROSS_CALL 15 |
1da177e4 | 28 | |
e54f8548 | 29 | static volatile int smp_processors_ready; |
1da177e4 | 30 | static int smp_highest_cpu; |
1da177e4 | 31 | |
a638f25a | 32 | static inline unsigned long sun4d_swap(volatile unsigned long *ptr, unsigned long val) |
1da177e4 LT |
33 | { |
34 | __asm__ __volatile__("swap [%1], %0\n\t" : | |
35 | "=&r" (val), "=&r" (ptr) : | |
36 | "0" (val), "1" (ptr)); | |
37 | return val; | |
38 | } | |
39 | ||
55dd23ec | 40 | static void smp4d_ipi_init(void); |
1da177e4 | 41 | |
7b1af32f DM |
42 | static unsigned char cpu_leds[32]; |
43 | ||
44 | static inline void show_leds(int cpuid) | |
45 | { | |
46 | cpuid &= 0x1e; | |
47 | __asm__ __volatile__ ("stba %0, [%1] %2" : : | |
48 | "r" ((cpu_leds[cpuid] << 4) | cpu_leds[cpuid+1]), | |
49 | "r" (ECSR_BASE(cpuid) | BB_LEDS), | |
50 | "i" (ASI_M_CTL)); | |
51 | } | |
52 | ||
2066aadd | 53 | void sun4d_cpu_pre_starting(void *arg) |
1da177e4 | 54 | { |
c68e5d39 | 55 | int cpuid = hard_smp_processor_id(); |
e54f8548 | 56 | |
1da177e4 LT |
57 | /* Show we are alive */ |
58 | cpu_leds[cpuid] = 0x6; | |
59 | show_leds(cpuid); | |
60 | ||
61 | /* Enable level15 interrupt, disable level14 interrupt for now */ | |
62 | cc_set_imsk((cc_get_imsk() & ~0x8000) | 0x4000); | |
f9fd3488 | 63 | } |
1da177e4 | 64 | |
2066aadd | 65 | void sun4d_cpu_pre_online(void *arg) |
f9fd3488 SR |
66 | { |
67 | unsigned long flags; | |
68 | int cpuid; | |
69 | ||
70 | cpuid = hard_smp_processor_id(); | |
1da177e4 | 71 | |
f9fd3488 | 72 | /* Unblock the master CPU _only_ when the scheduler state |
1da177e4 LT |
73 | * of all secondary CPUs will be up-to-date, so after |
74 | * the SMP initialization the master will be just allowed | |
75 | * to call the scheduler code. | |
76 | */ | |
a638f25a | 77 | sun4d_swap((unsigned long *)&cpu_callin_map[cpuid], 1); |
5d83d666 DM |
78 | local_ops->cache_all(); |
79 | local_ops->tlb_all(); | |
e54f8548 | 80 | |
e54f8548 | 81 | while ((unsigned long)current_set[cpuid] < PAGE_OFFSET) |
1da177e4 | 82 | barrier(); |
e54f8548 SR |
83 | |
84 | while (current_set[cpuid]->cpu != cpuid) | |
1da177e4 | 85 | barrier(); |
e54f8548 | 86 | |
1da177e4 LT |
87 | /* Fix idle thread fields. */ |
88 | __asm__ __volatile__("ld [%0], %%g6\n\t" | |
89 | : : "r" (¤t_set[cpuid]) | |
90 | : "memory" /* paranoid */); | |
91 | ||
92 | cpu_leds[cpuid] = 0x9; | |
93 | show_leds(cpuid); | |
e54f8548 | 94 | |
1da177e4 LT |
95 | /* Attach to the address space of init_task. */ |
96 | atomic_inc(&init_mm.mm_count); | |
97 | current->active_mm = &init_mm; | |
98 | ||
5d83d666 DM |
99 | local_ops->cache_all(); |
100 | local_ops->tlb_all(); | |
e54f8548 | 101 | |
fb1fece5 | 102 | while (!cpumask_test_cpu(cpuid, &smp_commenced_mask)) |
1da177e4 LT |
103 | barrier(); |
104 | ||
105 | spin_lock_irqsave(&sun4d_imsk_lock, flags); | |
106 | cc_set_imsk(cc_get_imsk() & ~0x4000); /* Allow PIL 14 as well */ | |
107 | spin_unlock_irqrestore(&sun4d_imsk_lock, flags); | |
108 | } | |
109 | ||
1da177e4 LT |
110 | /* |
111 | * Cycle through the processors asking the PROM to start each one. | |
112 | */ | |
1da177e4 LT |
113 | void __init smp4d_boot_cpus(void) |
114 | { | |
55dd23ec | 115 | smp4d_ipi_init(); |
1da177e4 LT |
116 | if (boot_cpu_id) |
117 | current_set[0] = NULL; | |
5d83d666 | 118 | local_ops->cache_all(); |
8b3c848c RB |
119 | } |
120 | ||
2066aadd | 121 | int smp4d_boot_one_cpu(int i, struct task_struct *idle) |
8b3c848c | 122 | { |
e54f8548 | 123 | unsigned long *entry = &sun4d_cpu_startup; |
e54f8548 SR |
124 | int timeout; |
125 | int cpu_node; | |
1da177e4 | 126 | |
e54f8548 | 127 | cpu_find_by_instance(i, &cpu_node, NULL); |
f0a2bc7e | 128 | current_set[i] = task_thread_info(idle); |
e54f8548 SR |
129 | /* |
130 | * Initialize the contexts table | |
131 | * Since the call to prom_startcpu() trashes the structure, | |
132 | * we need to re-initialize it for each cpu | |
133 | */ | |
134 | smp_penguin_ctable.which_io = 0; | |
135 | smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys; | |
136 | smp_penguin_ctable.reg_size = 0; | |
137 | ||
138 | /* whirrr, whirrr, whirrrrrrrrr... */ | |
139 | printk(KERN_INFO "Starting CPU %d at %p\n", i, entry); | |
5d83d666 | 140 | local_ops->cache_all(); |
e54f8548 SR |
141 | prom_startcpu(cpu_node, |
142 | &smp_penguin_ctable, 0, (char *)entry); | |
143 | ||
144 | printk(KERN_INFO "prom_startcpu returned :)\n"); | |
145 | ||
146 | /* wheee... it's going... */ | |
147 | for (timeout = 0; timeout < 10000; timeout++) { | |
148 | if (cpu_callin_map[i]) | |
149 | break; | |
150 | udelay(200); | |
151 | } | |
1da177e4 | 152 | |
8b3c848c | 153 | if (!(cpu_callin_map[i])) { |
e54f8548 | 154 | printk(KERN_ERR "Processor %d is stuck.\n", i); |
8b3c848c RB |
155 | return -ENODEV; |
156 | ||
1da177e4 | 157 | } |
5d83d666 | 158 | local_ops->cache_all(); |
8b3c848c RB |
159 | return 0; |
160 | } | |
161 | ||
162 | void __init smp4d_smp_done(void) | |
163 | { | |
164 | int i, first; | |
165 | int *prev; | |
166 | ||
167 | /* setup cpu list for irq rotation */ | |
168 | first = 0; | |
169 | prev = &first; | |
ec7c14bd RR |
170 | for_each_online_cpu(i) { |
171 | *prev = i; | |
172 | prev = &cpu_data(i).next; | |
173 | } | |
8b3c848c | 174 | *prev = first; |
5d83d666 | 175 | local_ops->cache_all(); |
1da177e4 | 176 | |
1da177e4 LT |
177 | /* Ok, they are spinning and ready to go. */ |
178 | smp_processors_ready = 1; | |
179 | sun4d_distribute_irqs(); | |
180 | } | |
181 | ||
55dd23ec DH |
182 | /* Memory structure giving interrupt handler information about IPI generated */ |
183 | struct sun4d_ipi_work { | |
184 | int single; | |
185 | int msk; | |
186 | int resched; | |
187 | }; | |
188 | ||
189 | static DEFINE_PER_CPU_SHARED_ALIGNED(struct sun4d_ipi_work, sun4d_ipi_work); | |
190 | ||
191 | /* Initialize IPIs on the SUN4D SMP machine */ | |
192 | static void __init smp4d_ipi_init(void) | |
193 | { | |
194 | int cpu; | |
195 | struct sun4d_ipi_work *work; | |
196 | ||
197 | printk(KERN_INFO "smp4d: setup IPI at IRQ %d\n", SUN4D_IPI_IRQ); | |
198 | ||
199 | for_each_possible_cpu(cpu) { | |
200 | work = &per_cpu(sun4d_ipi_work, cpu); | |
201 | work->single = work->msk = work->resched = 0; | |
202 | } | |
203 | } | |
204 | ||
205 | void sun4d_ipi_interrupt(void) | |
206 | { | |
207 | struct sun4d_ipi_work *work = &__get_cpu_var(sun4d_ipi_work); | |
208 | ||
209 | if (work->single) { | |
210 | work->single = 0; | |
211 | smp_call_function_single_interrupt(); | |
212 | } | |
213 | if (work->msk) { | |
214 | work->msk = 0; | |
215 | smp_call_function_interrupt(); | |
216 | } | |
217 | if (work->resched) { | |
218 | work->resched = 0; | |
219 | smp_resched_interrupt(); | |
220 | } | |
221 | } | |
222 | ||
4ba22b16 SR |
223 | /* +-------+-------------+-----------+------------------------------------+ |
224 | * | bcast | devid | sid | levels mask | | |
225 | * +-------+-------------+-----------+------------------------------------+ | |
226 | * 31 30 23 22 15 14 0 | |
227 | */ | |
228 | #define IGEN_MESSAGE(bcast, devid, sid, levels) \ | |
229 | (((bcast) << 31) | ((devid) << 23) | ((sid) << 15) | (levels)) | |
230 | ||
231 | static void sun4d_send_ipi(int cpu, int level) | |
232 | { | |
233 | cc_set_igen(IGEN_MESSAGE(0, cpu << 3, 6 + ((level >> 1) & 7), 1 << (level - 1))); | |
234 | } | |
235 | ||
236 | static void sun4d_ipi_single(int cpu) | |
55dd23ec DH |
237 | { |
238 | struct sun4d_ipi_work *work = &per_cpu(sun4d_ipi_work, cpu); | |
239 | ||
240 | /* Mark work */ | |
241 | work->single = 1; | |
242 | ||
243 | /* Generate IRQ on the CPU */ | |
244 | sun4d_send_ipi(cpu, SUN4D_IPI_IRQ); | |
245 | } | |
246 | ||
4ba22b16 | 247 | static void sun4d_ipi_mask_one(int cpu) |
55dd23ec DH |
248 | { |
249 | struct sun4d_ipi_work *work = &per_cpu(sun4d_ipi_work, cpu); | |
250 | ||
251 | /* Mark work */ | |
252 | work->msk = 1; | |
253 | ||
254 | /* Generate IRQ on the CPU */ | |
255 | sun4d_send_ipi(cpu, SUN4D_IPI_IRQ); | |
256 | } | |
257 | ||
4ba22b16 | 258 | static void sun4d_ipi_resched(int cpu) |
55dd23ec DH |
259 | { |
260 | struct sun4d_ipi_work *work = &per_cpu(sun4d_ipi_work, cpu); | |
261 | ||
262 | /* Mark work */ | |
263 | work->resched = 1; | |
264 | ||
265 | /* Generate IRQ on the CPU (any IRQ will cause resched) */ | |
266 | sun4d_send_ipi(cpu, SUN4D_IPI_IRQ); | |
267 | } | |
268 | ||
1da177e4 LT |
269 | static struct smp_funcall { |
270 | smpfunc_t func; | |
271 | unsigned long arg1; | |
272 | unsigned long arg2; | |
273 | unsigned long arg3; | |
274 | unsigned long arg4; | |
275 | unsigned long arg5; | |
276 | unsigned char processors_in[NR_CPUS]; /* Set when ipi entered. */ | |
277 | unsigned char processors_out[NR_CPUS]; /* Set when ipi exited. */ | |
278 | } ccall_info __attribute__((aligned(8))); | |
279 | ||
280 | static DEFINE_SPINLOCK(cross_call_lock); | |
281 | ||
282 | /* Cross calls must be serialized, at least currently. */ | |
4ba22b16 | 283 | static void sun4d_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1, |
66e4f8c0 DM |
284 | unsigned long arg2, unsigned long arg3, |
285 | unsigned long arg4) | |
1da177e4 | 286 | { |
e54f8548 | 287 | if (smp_processors_ready) { |
1da177e4 LT |
288 | register int high = smp_highest_cpu; |
289 | unsigned long flags; | |
290 | ||
291 | spin_lock_irqsave(&cross_call_lock, flags); | |
292 | ||
293 | { | |
e54f8548 SR |
294 | /* |
295 | * If you make changes here, make sure | |
296 | * gcc generates proper code... | |
297 | */ | |
1da177e4 LT |
298 | register smpfunc_t f asm("i0") = func; |
299 | register unsigned long a1 asm("i1") = arg1; | |
300 | register unsigned long a2 asm("i2") = arg2; | |
301 | register unsigned long a3 asm("i3") = arg3; | |
302 | register unsigned long a4 asm("i4") = arg4; | |
66e4f8c0 | 303 | register unsigned long a5 asm("i5") = 0; |
1da177e4 LT |
304 | |
305 | __asm__ __volatile__( | |
306 | "std %0, [%6]\n\t" | |
307 | "std %2, [%6 + 8]\n\t" | |
308 | "std %4, [%6 + 16]\n\t" : : | |
309 | "r"(f), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5), | |
310 | "r" (&ccall_info.func)); | |
311 | } | |
312 | ||
313 | /* Init receive/complete mapping, plus fire the IPI's off. */ | |
314 | { | |
1da177e4 LT |
315 | register int i; |
316 | ||
fb1fece5 KM |
317 | cpumask_clear_cpu(smp_processor_id(), &mask); |
318 | cpumask_and(&mask, cpu_online_mask, &mask); | |
e54f8548 | 319 | for (i = 0; i <= high; i++) { |
fb1fece5 | 320 | if (cpumask_test_cpu(i, &mask)) { |
1da177e4 LT |
321 | ccall_info.processors_in[i] = 0; |
322 | ccall_info.processors_out[i] = 0; | |
323 | sun4d_send_ipi(i, IRQ_CROSS_CALL); | |
324 | } | |
325 | } | |
326 | } | |
327 | ||
328 | { | |
329 | register int i; | |
330 | ||
331 | i = 0; | |
332 | do { | |
fb1fece5 | 333 | if (!cpumask_test_cpu(i, &mask)) |
66e4f8c0 | 334 | continue; |
e54f8548 | 335 | while (!ccall_info.processors_in[i]) |
1da177e4 | 336 | barrier(); |
e54f8548 | 337 | } while (++i <= high); |
1da177e4 LT |
338 | |
339 | i = 0; | |
340 | do { | |
fb1fece5 | 341 | if (!cpumask_test_cpu(i, &mask)) |
66e4f8c0 | 342 | continue; |
e54f8548 | 343 | while (!ccall_info.processors_out[i]) |
1da177e4 | 344 | barrier(); |
e54f8548 | 345 | } while (++i <= high); |
1da177e4 LT |
346 | } |
347 | ||
348 | spin_unlock_irqrestore(&cross_call_lock, flags); | |
349 | } | |
350 | } | |
351 | ||
352 | /* Running cross calls. */ | |
353 | void smp4d_cross_call_irq(void) | |
354 | { | |
c68e5d39 | 355 | int i = hard_smp_processor_id(); |
1da177e4 LT |
356 | |
357 | ccall_info.processors_in[i] = 1; | |
358 | ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3, | |
359 | ccall_info.arg4, ccall_info.arg5); | |
360 | ccall_info.processors_out[i] = 1; | |
361 | } | |
362 | ||
1da177e4 LT |
363 | void smp4d_percpu_timer_interrupt(struct pt_regs *regs) |
364 | { | |
0d84438d | 365 | struct pt_regs *old_regs; |
c68e5d39 | 366 | int cpu = hard_smp_processor_id(); |
62f08283 | 367 | struct clock_event_device *ce; |
1da177e4 LT |
368 | static int cpu_tick[NR_CPUS]; |
369 | static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd }; | |
370 | ||
0d84438d | 371 | old_regs = set_irq_regs(regs); |
e54f8548 | 372 | bw_get_prof_limit(cpu); |
1da177e4 LT |
373 | bw_clear_intr_mask(0, 1); /* INTR_TABLE[0] & 1 is Profile IRQ */ |
374 | ||
375 | cpu_tick[cpu]++; | |
376 | if (!(cpu_tick[cpu] & 15)) { | |
377 | if (cpu_tick[cpu] == 0x60) | |
378 | cpu_tick[cpu] = 0; | |
379 | cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4]; | |
380 | show_leds(cpu); | |
381 | } | |
382 | ||
62f08283 | 383 | ce = &per_cpu(sparc32_clockevent, cpu); |
1da177e4 | 384 | |
62f08283 TK |
385 | irq_enter(); |
386 | ce->event_handler(ce); | |
387 | irq_exit(); | |
1da177e4 | 388 | |
0d84438d | 389 | set_irq_regs(old_regs); |
1da177e4 LT |
390 | } |
391 | ||
4ba22b16 SR |
392 | static const struct sparc32_ipi_ops sun4d_ipi_ops = { |
393 | .cross_call = sun4d_cross_call, | |
394 | .resched = sun4d_ipi_resched, | |
395 | .single = sun4d_ipi_single, | |
396 | .mask_one = sun4d_ipi_mask_one, | |
397 | }; | |
398 | ||
1da177e4 LT |
399 | void __init sun4d_init_smp(void) |
400 | { | |
401 | int i; | |
1da177e4 LT |
402 | |
403 | /* Patch ipi15 trap table */ | |
404 | t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m); | |
e54f8548 | 405 | |
4ba22b16 | 406 | sparc32_ipi_ops = &sun4d_ipi_ops; |
e54f8548 | 407 | |
1da177e4 LT |
408 | for (i = 0; i < NR_CPUS; i++) { |
409 | ccall_info.processors_in[i] = 1; | |
410 | ccall_info.processors_out[i] = 1; | |
411 | } | |
412 | } |