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/clockchips.h>
10 #include <linux/interrupt.h>
11 #include <linux/profile.h>
12 #include <linux/delay.h>
13 #include <linux/sched.h>
14 #include <linux/cpu.h>
15
16 #include <asm/cacheflush.h>
17 #include <asm/switch_to.h>
18 #include <asm/tlbflush.h>
19 #include <asm/timer.h>
20 #include <asm/oplib.h>
21 #include <asm/sbi.h>
22 #include <asm/mmu.h>
23
24 #include "kernel.h"
25 #include "irq.h"
26
27 #define IRQ_CROSS_CALL 15
28
29 static volatile int smp_processors_ready;
30 static int smp_highest_cpu;
31
sun4d_swap(volatile unsigned long * ptr,unsigned long val)32 static inline unsigned long sun4d_swap(volatile unsigned long *ptr, unsigned long val)
33 {
34 __asm__ __volatile__("swap [%1], %0\n\t" :
35 "=&r" (val), "=&r" (ptr) :
36 "0" (val), "1" (ptr));
37 return val;
38 }
39
40 static void smp4d_ipi_init(void);
41
42 static unsigned char cpu_leds[32];
43
show_leds(int cpuid)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
sun4d_cpu_pre_starting(void * arg)53 void sun4d_cpu_pre_starting(void *arg)
54 {
55 int cpuid = hard_smp_processor_id();
56
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);
63 }
64
sun4d_cpu_pre_online(void * arg)65 void sun4d_cpu_pre_online(void *arg)
66 {
67 unsigned long flags;
68 int cpuid;
69
70 cpuid = hard_smp_processor_id();
71
72 /* Unblock the master CPU _only_ when the scheduler state
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 */
77 sun4d_swap((unsigned long *)&cpu_callin_map[cpuid], 1);
78 local_ops->cache_all();
79 local_ops->tlb_all();
80
81 while ((unsigned long)current_set[cpuid] < PAGE_OFFSET)
82 barrier();
83
84 while (current_set[cpuid]->cpu != cpuid)
85 barrier();
86
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);
94
95 /* Attach to the address space of init_task. */
96 atomic_inc(&init_mm.mm_count);
97 current->active_mm = &init_mm;
98
99 local_ops->cache_all();
100 local_ops->tlb_all();
101
102 while (!cpumask_test_cpu(cpuid, &smp_commenced_mask))
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
110 /*
111 * Cycle through the processors asking the PROM to start each one.
112 */
smp4d_boot_cpus(void)113 void __init smp4d_boot_cpus(void)
114 {
115 smp4d_ipi_init();
116 if (boot_cpu_id)
117 current_set[0] = NULL;
118 local_ops->cache_all();
119 }
120
smp4d_boot_one_cpu(int i,struct task_struct * idle)121 int smp4d_boot_one_cpu(int i, struct task_struct *idle)
122 {
123 unsigned long *entry = &sun4d_cpu_startup;
124 int timeout;
125 int cpu_node;
126
127 cpu_find_by_instance(i, &cpu_node, NULL);
128 current_set[i] = task_thread_info(idle);
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);
140 local_ops->cache_all();
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 }
152
153 if (!(cpu_callin_map[i])) {
154 printk(KERN_ERR "Processor %d is stuck.\n", i);
155 return -ENODEV;
156
157 }
158 local_ops->cache_all();
159 return 0;
160 }
161
smp4d_smp_done(void)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;
170 for_each_online_cpu(i) {
171 *prev = i;
172 prev = &cpu_data(i).next;
173 }
174 *prev = first;
175 local_ops->cache_all();
176
177 /* Ok, they are spinning and ready to go. */
178 smp_processors_ready = 1;
179 sun4d_distribute_irqs();
180 }
181
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 */
smp4d_ipi_init(void)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
sun4d_ipi_interrupt(void)205 void sun4d_ipi_interrupt(void)
206 {
207 struct sun4d_ipi_work *work = this_cpu_ptr(&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
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
sun4d_send_ipi(int cpu,int level)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
sun4d_ipi_single(int cpu)236 static void sun4d_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
sun4d_ipi_mask_one(int cpu)247 static void sun4d_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
sun4d_ipi_resched(int cpu)258 static void sun4d_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. */
sun4d_cross_call(smpfunc_t func,cpumask_t mask,unsigned long arg1,unsigned long arg2,unsigned long arg3,unsigned long arg4)283 static void sun4d_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_smp_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_smp_processor_id();
367 struct clock_event_device *ce;
368 static int cpu_tick[NR_CPUS];
369 static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd };
370
371 old_regs = set_irq_regs(regs);
372 bw_get_prof_limit(cpu);
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
383 ce = &per_cpu(sparc32_clockevent, cpu);
384
385 irq_enter();
386 ce->event_handler(ce);
387 irq_exit();
388
389 set_irq_regs(old_regs);
390 }
391
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
sun4d_init_smp(void)399 void __init sun4d_init_smp(void)
400 {
401 int i;
402
403 /* Patch ipi15 trap table */
404 t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m);
405
406 sparc32_ipi_ops = &sun4d_ipi_ops;
407
408 for (i = 0; i < NR_CPUS; i++) {
409 ccall_info.processors_in[i] = 1;
410 ccall_info.processors_out[i] = 1;
411 }
412 }
413