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/cacheflush.h>
18
19 #include "kernel.h"
20 #include "irq.h"
21
22 #define IRQ_CROSS_CALL 15
23
24 static volatile int smp_processors_ready;
25 static int smp_highest_cpu;
26
sun4d_swap(volatile unsigned long * ptr,unsigned long val)27 static inline unsigned long sun4d_swap(volatile unsigned long *ptr, unsigned long val)
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);
36
37 static unsigned char cpu_leds[32];
38
show_leds(int cpuid)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
smp4d_callin(void)48 void __cpuinit smp4d_callin(void)
49 {
50 int cpuid = hard_smp4d_processor_id();
51 unsigned long flags;
52
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
63 notify_cpu_starting(cpuid);
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. */
79 sun4d_swap((unsigned long *)&cpu_callin_map[cpuid], 1);
80 local_flush_cache_all();
81 local_flush_tlb_all();
82
83 cpu_probe();
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 (!cpu_isset(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 if (boot_cpu_id)
124 current_set[0] = NULL;
125 smp_setup_percpu_timer();
126 local_flush_cache_all();
127 }
128
smp4d_boot_one_cpu(int i)129 int __cpuinit smp4d_boot_one_cpu(int i)
130 {
131 unsigned long *entry = &sun4d_cpu_startup;
132 struct task_struct *p;
133 int timeout;
134 int cpu_node;
135
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 }
164
165 if (!(cpu_callin_map[i])) {
166 printk(KERN_ERR "Processor %d is stuck.\n", i);
167 return -ENODEV;
168
169 }
170 local_flush_cache_all();
171 return 0;
172 }
173
smp4d_smp_done(void)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;
182 for_each_online_cpu(i) {
183 *prev = i;
184 prev = &cpu_data(i).next;
185 }
186 *prev = first;
187 local_flush_cache_all();
188
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. */
smp4d_cross_call(smpfunc_t func,cpumask_t mask,unsigned long arg1,unsigned long arg2,unsigned long arg3,unsigned long arg4)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)
211 {
212 if (smp_processors_ready) {
213 register int high = smp_highest_cpu;
214 unsigned long flags;
215
216 spin_lock_irqsave(&cross_call_lock, flags);
217
218 {
219 /*
220 * If you make changes here, make sure
221 * gcc generates proper code...
222 */
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;
228 register unsigned long a5 asm("i5") = 0;
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 {
240 register int i;
241
242 cpu_clear(smp_processor_id(), mask);
243 cpus_and(mask, cpu_online_map, mask);
244 for (i = 0; i <= high; i++) {
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 {
258 if (!cpu_isset(i, mask))
259 continue;
260 while (!ccall_info.processors_in[i])
261 barrier();
262 } while (++i <= high);
263
264 i = 0;
265 do {
266 if (!cpu_isset(i, mask))
267 continue;
268 while (!ccall_info.processors_out[i])
269 barrier();
270 } while (++i <= high);
271 }
272
273 spin_unlock_irqrestore(&cross_call_lock, flags);
274 }
275 }
276
277 /* Running cross calls. */
smp4d_cross_call_irq(void)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
smp4d_percpu_timer_interrupt(struct pt_regs * regs)288 void smp4d_percpu_timer_interrupt(struct pt_regs *regs)
289 {
290 struct pt_regs *old_regs;
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
295 old_regs = set_irq_regs(regs);
296 bw_get_prof_limit(cpu);
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
307 profile_tick(CPU_PROFILING);
308
309 if (!--prof_counter(cpu)) {
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 }
318 set_irq_regs(old_regs);
319 }
320
smp_setup_percpu_timer(void)321 static void __cpuinit smp_setup_percpu_timer(void)
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
smp4d_blackbox_id(unsigned * addr)329 void __init smp4d_blackbox_id(unsigned *addr)
330 {
331 int rd = *addr & 0x3e000000;
332
333 addr[0] = 0xc0800800 | rd; /* lda [%g0] ASI_M_VIKING_TMP1, reg */
334 addr[1] = 0x01000000; /* nop */
335 addr[2] = 0x01000000; /* nop */
336 }
337
smp4d_blackbox_current(unsigned * addr)338 void __init smp4d_blackbox_current(unsigned *addr)
339 {
340 int rd = *addr & 0x3e000000;
341
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
sun4d_init_smp(void)347 void __init sun4d_init_smp(void)
348 {
349 int i;
350
351 /* Patch ipi15 trap table */
352 t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m);
353
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);
358 BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4d_processor_id, BTFIXUPCALL_NORM);
359
360 for (i = 0; i < NR_CPUS; i++) {
361 ccall_info.processors_in[i] = 1;
362 ccall_info.processors_out[i] = 1;
363 }
364 }
365