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 LT |
16 | #include <asm/tlbflush.h> |
17 | #include <asm/cacheflush.h> | |
1da177e4 | 18 | |
e54f8548 | 19 | #include "kernel.h" |
32231a66 | 20 | #include "irq.h" |
1da177e4 | 21 | |
e54f8548 | 22 | #define IRQ_CROSS_CALL 15 |
1da177e4 | 23 | |
e54f8548 | 24 | static volatile int smp_processors_ready; |
1da177e4 | 25 | static int smp_highest_cpu; |
1da177e4 | 26 | |
a638f25a | 27 | static inline unsigned long sun4d_swap(volatile unsigned long *ptr, unsigned long val) |
1da177e4 LT |
28 | { |
29 | __asm__ __volatile__("swap [%1], %0\n\t" : | |
30 | "=&r" (val), "=&r" (ptr) : | |
31 | "0" (val), "1" (ptr)); | |
32 | return val; | |
33 | } | |
34 | ||
35 | static void smp_setup_percpu_timer(void); | |
1da177e4 | 36 | |
7b1af32f DM |
37 | static unsigned char cpu_leds[32]; |
38 | ||
39 | static inline void show_leds(int cpuid) | |
40 | { | |
41 | cpuid &= 0x1e; | |
42 | __asm__ __volatile__ ("stba %0, [%1] %2" : : | |
43 | "r" ((cpu_leds[cpuid] << 4) | cpu_leds[cpuid+1]), | |
44 | "r" (ECSR_BASE(cpuid) | BB_LEDS), | |
45 | "i" (ASI_M_CTL)); | |
46 | } | |
47 | ||
409832f5 | 48 | void __cpuinit smp4d_callin(void) |
1da177e4 LT |
49 | { |
50 | int cpuid = hard_smp4d_processor_id(); | |
1da177e4 | 51 | unsigned long flags; |
e54f8548 | 52 | |
1da177e4 LT |
53 | /* Show we are alive */ |
54 | cpu_leds[cpuid] = 0x6; | |
55 | show_leds(cpuid); | |
56 | ||
57 | /* Enable level15 interrupt, disable level14 interrupt for now */ | |
58 | cc_set_imsk((cc_get_imsk() & ~0x8000) | 0x4000); | |
59 | ||
60 | local_flush_cache_all(); | |
61 | local_flush_tlb_all(); | |
62 | ||
e545a614 | 63 | notify_cpu_starting(cpuid); |
1da177e4 LT |
64 | /* |
65 | * Unblock the master CPU _only_ when the scheduler state | |
66 | * of all secondary CPUs will be up-to-date, so after | |
67 | * the SMP initialization the master will be just allowed | |
68 | * to call the scheduler code. | |
69 | */ | |
70 | /* Get our local ticker going. */ | |
71 | smp_setup_percpu_timer(); | |
72 | ||
73 | calibrate_delay(); | |
74 | smp_store_cpu_info(cpuid); | |
75 | local_flush_cache_all(); | |
76 | local_flush_tlb_all(); | |
77 | ||
78 | /* Allow master to continue. */ | |
a638f25a | 79 | sun4d_swap((unsigned long *)&cpu_callin_map[cpuid], 1); |
1da177e4 LT |
80 | local_flush_cache_all(); |
81 | local_flush_tlb_all(); | |
e54f8548 | 82 | |
1da177e4 LT |
83 | cpu_probe(); |
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 | |
a54123e2 | 108 | while (!cpu_isset(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 | { | |
1da177e4 LT |
123 | if (boot_cpu_id) |
124 | current_set[0] = NULL; | |
1da177e4 LT |
125 | smp_setup_percpu_timer(); |
126 | local_flush_cache_all(); | |
8b3c848c RB |
127 | } |
128 | ||
b4cff846 | 129 | int __cpuinit smp4d_boot_one_cpu(int i) |
8b3c848c | 130 | { |
e54f8548 SR |
131 | unsigned long *entry = &sun4d_cpu_startup; |
132 | struct task_struct *p; | |
133 | int timeout; | |
134 | int cpu_node; | |
1da177e4 | 135 | |
e54f8548 SR |
136 | cpu_find_by_instance(i, &cpu_node, NULL); |
137 | /* Cook up an idler for this guy. */ | |
138 | p = fork_idle(i); | |
139 | current_set[i] = task_thread_info(p); | |
140 | ||
141 | /* | |
142 | * Initialize the contexts table | |
143 | * Since the call to prom_startcpu() trashes the structure, | |
144 | * we need to re-initialize it for each cpu | |
145 | */ | |
146 | smp_penguin_ctable.which_io = 0; | |
147 | smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys; | |
148 | smp_penguin_ctable.reg_size = 0; | |
149 | ||
150 | /* whirrr, whirrr, whirrrrrrrrr... */ | |
151 | printk(KERN_INFO "Starting CPU %d at %p\n", i, entry); | |
152 | local_flush_cache_all(); | |
153 | prom_startcpu(cpu_node, | |
154 | &smp_penguin_ctable, 0, (char *)entry); | |
155 | ||
156 | printk(KERN_INFO "prom_startcpu returned :)\n"); | |
157 | ||
158 | /* wheee... it's going... */ | |
159 | for (timeout = 0; timeout < 10000; timeout++) { | |
160 | if (cpu_callin_map[i]) | |
161 | break; | |
162 | udelay(200); | |
163 | } | |
1da177e4 | 164 | |
8b3c848c | 165 | if (!(cpu_callin_map[i])) { |
e54f8548 | 166 | printk(KERN_ERR "Processor %d is stuck.\n", i); |
8b3c848c RB |
167 | return -ENODEV; |
168 | ||
1da177e4 LT |
169 | } |
170 | local_flush_cache_all(); | |
8b3c848c RB |
171 | return 0; |
172 | } | |
173 | ||
174 | void __init smp4d_smp_done(void) | |
175 | { | |
176 | int i, first; | |
177 | int *prev; | |
178 | ||
179 | /* setup cpu list for irq rotation */ | |
180 | first = 0; | |
181 | prev = &first; | |
ec7c14bd RR |
182 | for_each_online_cpu(i) { |
183 | *prev = i; | |
184 | prev = &cpu_data(i).next; | |
185 | } | |
8b3c848c RB |
186 | *prev = first; |
187 | local_flush_cache_all(); | |
1da177e4 | 188 | |
1da177e4 LT |
189 | /* Ok, they are spinning and ready to go. */ |
190 | smp_processors_ready = 1; | |
191 | sun4d_distribute_irqs(); | |
192 | } | |
193 | ||
194 | static struct smp_funcall { | |
195 | smpfunc_t func; | |
196 | unsigned long arg1; | |
197 | unsigned long arg2; | |
198 | unsigned long arg3; | |
199 | unsigned long arg4; | |
200 | unsigned long arg5; | |
201 | unsigned char processors_in[NR_CPUS]; /* Set when ipi entered. */ | |
202 | unsigned char processors_out[NR_CPUS]; /* Set when ipi exited. */ | |
203 | } ccall_info __attribute__((aligned(8))); | |
204 | ||
205 | static DEFINE_SPINLOCK(cross_call_lock); | |
206 | ||
207 | /* Cross calls must be serialized, at least currently. */ | |
66e4f8c0 DM |
208 | static void smp4d_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1, |
209 | unsigned long arg2, unsigned long arg3, | |
210 | unsigned long arg4) | |
1da177e4 | 211 | { |
e54f8548 | 212 | if (smp_processors_ready) { |
1da177e4 LT |
213 | register int high = smp_highest_cpu; |
214 | unsigned long flags; | |
215 | ||
216 | spin_lock_irqsave(&cross_call_lock, flags); | |
217 | ||
218 | { | |
e54f8548 SR |
219 | /* |
220 | * If you make changes here, make sure | |
221 | * gcc generates proper code... | |
222 | */ | |
1da177e4 LT |
223 | register smpfunc_t f asm("i0") = func; |
224 | register unsigned long a1 asm("i1") = arg1; | |
225 | register unsigned long a2 asm("i2") = arg2; | |
226 | register unsigned long a3 asm("i3") = arg3; | |
227 | register unsigned long a4 asm("i4") = arg4; | |
66e4f8c0 | 228 | register unsigned long a5 asm("i5") = 0; |
1da177e4 LT |
229 | |
230 | __asm__ __volatile__( | |
231 | "std %0, [%6]\n\t" | |
232 | "std %2, [%6 + 8]\n\t" | |
233 | "std %4, [%6 + 16]\n\t" : : | |
234 | "r"(f), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5), | |
235 | "r" (&ccall_info.func)); | |
236 | } | |
237 | ||
238 | /* Init receive/complete mapping, plus fire the IPI's off. */ | |
239 | { | |
1da177e4 LT |
240 | register int i; |
241 | ||
66e4f8c0 DM |
242 | cpu_clear(smp_processor_id(), mask); |
243 | cpus_and(mask, cpu_online_map, mask); | |
e54f8548 | 244 | for (i = 0; i <= high; i++) { |
1da177e4 LT |
245 | if (cpu_isset(i, mask)) { |
246 | ccall_info.processors_in[i] = 0; | |
247 | ccall_info.processors_out[i] = 0; | |
248 | sun4d_send_ipi(i, IRQ_CROSS_CALL); | |
249 | } | |
250 | } | |
251 | } | |
252 | ||
253 | { | |
254 | register int i; | |
255 | ||
256 | i = 0; | |
257 | do { | |
66e4f8c0 DM |
258 | if (!cpu_isset(i, mask)) |
259 | continue; | |
e54f8548 | 260 | while (!ccall_info.processors_in[i]) |
1da177e4 | 261 | barrier(); |
e54f8548 | 262 | } while (++i <= high); |
1da177e4 LT |
263 | |
264 | i = 0; | |
265 | do { | |
66e4f8c0 DM |
266 | if (!cpu_isset(i, mask)) |
267 | continue; | |
e54f8548 | 268 | while (!ccall_info.processors_out[i]) |
1da177e4 | 269 | barrier(); |
e54f8548 | 270 | } while (++i <= high); |
1da177e4 LT |
271 | } |
272 | ||
273 | spin_unlock_irqrestore(&cross_call_lock, flags); | |
274 | } | |
275 | } | |
276 | ||
277 | /* Running cross calls. */ | |
278 | void smp4d_cross_call_irq(void) | |
279 | { | |
280 | int i = hard_smp4d_processor_id(); | |
281 | ||
282 | ccall_info.processors_in[i] = 1; | |
283 | ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3, | |
284 | ccall_info.arg4, ccall_info.arg5); | |
285 | ccall_info.processors_out[i] = 1; | |
286 | } | |
287 | ||
1da177e4 LT |
288 | void smp4d_percpu_timer_interrupt(struct pt_regs *regs) |
289 | { | |
0d84438d | 290 | struct pt_regs *old_regs; |
1da177e4 LT |
291 | int cpu = hard_smp4d_processor_id(); |
292 | static int cpu_tick[NR_CPUS]; | |
293 | static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd }; | |
294 | ||
0d84438d | 295 | old_regs = set_irq_regs(regs); |
e54f8548 | 296 | bw_get_prof_limit(cpu); |
1da177e4 LT |
297 | bw_clear_intr_mask(0, 1); /* INTR_TABLE[0] & 1 is Profile IRQ */ |
298 | ||
299 | cpu_tick[cpu]++; | |
300 | if (!(cpu_tick[cpu] & 15)) { | |
301 | if (cpu_tick[cpu] == 0x60) | |
302 | cpu_tick[cpu] = 0; | |
303 | cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4]; | |
304 | show_leds(cpu); | |
305 | } | |
306 | ||
0d84438d | 307 | profile_tick(CPU_PROFILING); |
1da177e4 | 308 | |
e54f8548 | 309 | if (!--prof_counter(cpu)) { |
1da177e4 LT |
310 | int user = user_mode(regs); |
311 | ||
312 | irq_enter(); | |
313 | update_process_times(user); | |
314 | irq_exit(); | |
315 | ||
316 | prof_counter(cpu) = prof_multiplier(cpu); | |
317 | } | |
0d84438d | 318 | set_irq_regs(old_regs); |
1da177e4 LT |
319 | } |
320 | ||
409832f5 | 321 | static void __cpuinit smp_setup_percpu_timer(void) |
1da177e4 LT |
322 | { |
323 | int cpu = hard_smp4d_processor_id(); | |
324 | ||
325 | prof_counter(cpu) = prof_multiplier(cpu) = 1; | |
326 | load_profile_irq(cpu, lvl14_resolution); | |
327 | } | |
328 | ||
329 | void __init smp4d_blackbox_id(unsigned *addr) | |
330 | { | |
331 | int rd = *addr & 0x3e000000; | |
e54f8548 | 332 | |
1da177e4 | 333 | addr[0] = 0xc0800800 | rd; /* lda [%g0] ASI_M_VIKING_TMP1, reg */ |
e54f8548 SR |
334 | addr[1] = 0x01000000; /* nop */ |
335 | addr[2] = 0x01000000; /* nop */ | |
1da177e4 LT |
336 | } |
337 | ||
338 | void __init smp4d_blackbox_current(unsigned *addr) | |
339 | { | |
340 | int rd = *addr & 0x3e000000; | |
e54f8548 | 341 | |
1da177e4 LT |
342 | addr[0] = 0xc0800800 | rd; /* lda [%g0] ASI_M_VIKING_TMP1, reg */ |
343 | addr[2] = 0x81282002 | rd | (rd >> 11); /* sll reg, 2, reg */ | |
344 | addr[4] = 0x01000000; /* nop */ | |
345 | } | |
346 | ||
347 | void __init sun4d_init_smp(void) | |
348 | { | |
349 | int i; | |
1da177e4 LT |
350 | |
351 | /* Patch ipi15 trap table */ | |
352 | t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m); | |
e54f8548 | 353 | |
1da177e4 LT |
354 | /* And set btfixup... */ |
355 | BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4d_blackbox_id); | |
356 | BTFIXUPSET_BLACKBOX(load_current, smp4d_blackbox_current); | |
357 | BTFIXUPSET_CALL(smp_cross_call, smp4d_cross_call, BTFIXUPCALL_NORM); | |
1da177e4 | 358 | BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4d_processor_id, BTFIXUPCALL_NORM); |
e54f8548 | 359 | |
1da177e4 LT |
360 | for (i = 0; i < NR_CPUS; i++) { |
361 | ccall_info.processors_in[i] = 1; | |
362 | ccall_info.processors_out[i] = 1; | |
363 | } | |
364 | } |