1 /* Sparc SS1000/SC2000 SMP support.
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
9 #include <linux/interrupt.h>
10 #include <linux/profile.h>
11 #include <linux/delay.h>
12 #include <linux/cpu.h>
13
14 #include <asm/sbi.h>
15 #include <asm/mmu.h>
16 #include <asm/tlbflush.h>
17 #include <asm/switch_to.h>
18 #include <asm/cacheflush.h>
19
20 #include "kernel.h"
21 #include "irq.h"
22
23 #define IRQ_CROSS_CALL 15
24
25 static volatile int smp_processors_ready;
26 static int smp_highest_cpu;
27
sun4d_swap(volatile unsigned long * ptr,unsigned long val)28 static inline unsigned long sun4d_swap(volatile unsigned long *ptr, unsigned long val)
29 {
30 __asm__ __volatile__("swap [%1], %0\n\t" :
31 "=&r" (val), "=&r" (ptr) :
32 "0" (val), "1" (ptr));
33 return val;
34 }
35
36 static void smp4d_ipi_init(void);
37 static void smp_setup_percpu_timer(void);
38
39 static unsigned char cpu_leds[32];
40
show_leds(int cpuid)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
smp4d_callin(void)50 void __cpuinit smp4d_callin(void)
51 {
52 int cpuid = hard_smp4d_processor_id();
53 unsigned long flags;
54
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
65 notify_cpu_starting(cpuid);
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. */
81 sun4d_swap((unsigned long *)&cpu_callin_map[cpuid], 1);
82 local_flush_cache_all();
83 local_flush_tlb_all();
84
85 while ((unsigned long)current_set[cpuid] < PAGE_OFFSET)
86 barrier();
87
88 while (current_set[cpuid]->cpu != cpuid)
89 barrier();
90
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);
98
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();
105
106 local_irq_enable(); /* We don't allow PIL 14 yet */
107
108 while (!cpumask_test_cpu(cpuid, &smp_commenced_mask))
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);
114 set_cpu_online(cpuid, true);
115
116 }
117
118 /*
119 * Cycle through the processors asking the PROM to start each one.
120 */
smp4d_boot_cpus(void)121 void __init smp4d_boot_cpus(void)
122 {
123 smp4d_ipi_init();
124 if (boot_cpu_id)
125 current_set[0] = NULL;
126 smp_setup_percpu_timer();
127 local_flush_cache_all();
128 }
129
smp4d_boot_one_cpu(int i)130 int __cpuinit smp4d_boot_one_cpu(int i)
131 {
132 unsigned long *entry = &sun4d_cpu_startup;
133 struct task_struct *p;
134 int timeout;
135 int cpu_node;
136
137 cpu_find_by_instance(i, &cpu_node, NULL);
138 /* Cook up an idler for this guy. */
139 p = fork_idle(i);
140 current_set[i] = task_thread_info(p);
141
142 /*
143 * Initialize the contexts table
144 * Since the call to prom_startcpu() trashes the structure,
145 * we need to re-initialize it for each cpu
146 */
147 smp_penguin_ctable.which_io = 0;
148 smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
149 smp_penguin_ctable.reg_size = 0;
150
151 /* whirrr, whirrr, whirrrrrrrrr... */
152 printk(KERN_INFO "Starting CPU %d at %p\n", i, entry);
153 local_flush_cache_all();
154 prom_startcpu(cpu_node,
155 &smp_penguin_ctable, 0, (char *)entry);
156
157 printk(KERN_INFO "prom_startcpu returned :)\n");
158
159 /* wheee... it's going... */
160 for (timeout = 0; timeout < 10000; timeout++) {
161 if (cpu_callin_map[i])
162 break;
163 udelay(200);
164 }
165
166 if (!(cpu_callin_map[i])) {
167 printk(KERN_ERR "Processor %d is stuck.\n", i);
168 return -ENODEV;
169
170 }
171 local_flush_cache_all();
172 return 0;
173 }
174
smp4d_smp_done(void)175 void __init smp4d_smp_done(void)
176 {
177 int i, first;
178 int *prev;
179
180 /* setup cpu list for irq rotation */
181 first = 0;
182 prev = &first;
183 for_each_online_cpu(i) {
184 *prev = i;
185 prev = &cpu_data(i).next;
186 }
187 *prev = first;
188 local_flush_cache_all();
189
190 /* Ok, they are spinning and ready to go. */
191 smp_processors_ready = 1;
192 sun4d_distribute_irqs();
193 }
194
195 /* Memory structure giving interrupt handler information about IPI generated */
196 struct sun4d_ipi_work {
197 int single;
198 int msk;
199 int resched;
200 };
201
202 static DEFINE_PER_CPU_SHARED_ALIGNED(struct sun4d_ipi_work, sun4d_ipi_work);
203
204 /* Initialize IPIs on the SUN4D SMP machine */
smp4d_ipi_init(void)205 static void __init smp4d_ipi_init(void)
206 {
207 int cpu;
208 struct sun4d_ipi_work *work;
209
210 printk(KERN_INFO "smp4d: setup IPI at IRQ %d\n", SUN4D_IPI_IRQ);
211
212 for_each_possible_cpu(cpu) {
213 work = &per_cpu(sun4d_ipi_work, cpu);
214 work->single = work->msk = work->resched = 0;
215 }
216 }
217
sun4d_ipi_interrupt(void)218 void sun4d_ipi_interrupt(void)
219 {
220 struct sun4d_ipi_work *work = &__get_cpu_var(sun4d_ipi_work);
221
222 if (work->single) {
223 work->single = 0;
224 smp_call_function_single_interrupt();
225 }
226 if (work->msk) {
227 work->msk = 0;
228 smp_call_function_interrupt();
229 }
230 if (work->resched) {
231 work->resched = 0;
232 smp_resched_interrupt();
233 }
234 }
235
smp4d_ipi_single(int cpu)236 static void smp4d_ipi_single(int cpu)
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
smp4d_ipi_mask_one(int cpu)247 static void smp4d_ipi_mask_one(int cpu)
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
smp4d_ipi_resched(int cpu)258 static void smp4d_ipi_resched(int cpu)
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
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. */
smp4d_cross_call(smpfunc_t func,cpumask_t mask,unsigned long arg1,unsigned long arg2,unsigned long arg3,unsigned long arg4)283 static void smp4d_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
284 unsigned long arg2, unsigned long arg3,
285 unsigned long arg4)
286 {
287 if (smp_processors_ready) {
288 register int high = smp_highest_cpu;
289 unsigned long flags;
290
291 spin_lock_irqsave(&cross_call_lock, flags);
292
293 {
294 /*
295 * If you make changes here, make sure
296 * gcc generates proper code...
297 */
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;
303 register unsigned long a5 asm("i5") = 0;
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 {
315 register int i;
316
317 cpumask_clear_cpu(smp_processor_id(), &mask);
318 cpumask_and(&mask, cpu_online_mask, &mask);
319 for (i = 0; i <= high; i++) {
320 if (cpumask_test_cpu(i, &mask)) {
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 {
333 if (!cpumask_test_cpu(i, &mask))
334 continue;
335 while (!ccall_info.processors_in[i])
336 barrier();
337 } while (++i <= high);
338
339 i = 0;
340 do {
341 if (!cpumask_test_cpu(i, &mask))
342 continue;
343 while (!ccall_info.processors_out[i])
344 barrier();
345 } while (++i <= high);
346 }
347
348 spin_unlock_irqrestore(&cross_call_lock, flags);
349 }
350 }
351
352 /* Running cross calls. */
smp4d_cross_call_irq(void)353 void smp4d_cross_call_irq(void)
354 {
355 int i = hard_smp4d_processor_id();
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
smp4d_percpu_timer_interrupt(struct pt_regs * regs)363 void smp4d_percpu_timer_interrupt(struct pt_regs *regs)
364 {
365 struct pt_regs *old_regs;
366 int cpu = hard_smp4d_processor_id();
367 static int cpu_tick[NR_CPUS];
368 static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd };
369
370 old_regs = set_irq_regs(regs);
371 bw_get_prof_limit(cpu);
372 bw_clear_intr_mask(0, 1); /* INTR_TABLE[0] & 1 is Profile IRQ */
373
374 cpu_tick[cpu]++;
375 if (!(cpu_tick[cpu] & 15)) {
376 if (cpu_tick[cpu] == 0x60)
377 cpu_tick[cpu] = 0;
378 cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4];
379 show_leds(cpu);
380 }
381
382 profile_tick(CPU_PROFILING);
383
384 if (!--prof_counter(cpu)) {
385 int user = user_mode(regs);
386
387 irq_enter();
388 update_process_times(user);
389 irq_exit();
390
391 prof_counter(cpu) = prof_multiplier(cpu);
392 }
393 set_irq_regs(old_regs);
394 }
395
smp_setup_percpu_timer(void)396 static void __cpuinit smp_setup_percpu_timer(void)
397 {
398 int cpu = hard_smp4d_processor_id();
399
400 prof_counter(cpu) = prof_multiplier(cpu) = 1;
401 load_profile_irq(cpu, lvl14_resolution);
402 }
403
smp4d_blackbox_id(unsigned * addr)404 void __init smp4d_blackbox_id(unsigned *addr)
405 {
406 int rd = *addr & 0x3e000000;
407
408 addr[0] = 0xc0800800 | rd; /* lda [%g0] ASI_M_VIKING_TMP1, reg */
409 addr[1] = 0x01000000; /* nop */
410 addr[2] = 0x01000000; /* nop */
411 }
412
smp4d_blackbox_current(unsigned * addr)413 void __init smp4d_blackbox_current(unsigned *addr)
414 {
415 int rd = *addr & 0x3e000000;
416
417 addr[0] = 0xc0800800 | rd; /* lda [%g0] ASI_M_VIKING_TMP1, reg */
418 addr[2] = 0x81282002 | rd | (rd >> 11); /* sll reg, 2, reg */
419 addr[4] = 0x01000000; /* nop */
420 }
421
sun4d_init_smp(void)422 void __init sun4d_init_smp(void)
423 {
424 int i;
425
426 /* Patch ipi15 trap table */
427 t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m);
428
429 /* And set btfixup... */
430 BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4d_blackbox_id);
431 BTFIXUPSET_BLACKBOX(load_current, smp4d_blackbox_current);
432 BTFIXUPSET_CALL(smp_cross_call, smp4d_cross_call, BTFIXUPCALL_NORM);
433 BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4d_processor_id, BTFIXUPCALL_NORM);
434 BTFIXUPSET_CALL(smp_ipi_resched, smp4d_ipi_resched, BTFIXUPCALL_NORM);
435 BTFIXUPSET_CALL(smp_ipi_single, smp4d_ipi_single, BTFIXUPCALL_NORM);
436 BTFIXUPSET_CALL(smp_ipi_mask_one, smp4d_ipi_mask_one, BTFIXUPCALL_NORM);
437
438 for (i = 0; i < NR_CPUS; i++) {
439 ccall_info.processors_in[i] = 1;
440 ccall_info.processors_out[i] = 1;
441 }
442 }
443