1 /* leon_smp.c: Sparc-Leon SMP support.
2 *
3 * based on sun4m_smp.c
4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
6 * Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
7 */
8
9 #include <asm/head.h>
10
11 #include <linux/kernel.h>
12 #include <linux/sched.h>
13 #include <linux/threads.h>
14 #include <linux/smp.h>
15 #include <linux/interrupt.h>
16 #include <linux/kernel_stat.h>
17 #include <linux/init.h>
18 #include <linux/spinlock.h>
19 #include <linux/mm.h>
20 #include <linux/swap.h>
21 #include <linux/profile.h>
22 #include <linux/pm.h>
23 #include <linux/delay.h>
24 #include <linux/gfp.h>
25
26 #include <asm/cacheflush.h>
27 #include <asm/tlbflush.h>
28
29 #include <asm/ptrace.h>
30 #include <asm/atomic.h>
31 #include <asm/irq_regs.h>
32
33 #include <asm/delay.h>
34 #include <asm/irq.h>
35 #include <asm/page.h>
36 #include <asm/pgalloc.h>
37 #include <asm/pgtable.h>
38 #include <asm/oplib.h>
39 #include <asm/cpudata.h>
40 #include <asm/asi.h>
41 #include <asm/leon.h>
42 #include <asm/leon_amba.h>
43
44 #include "kernel.h"
45
46 #ifdef CONFIG_SPARC_LEON
47
48 #include "irq.h"
49
50 extern ctxd_t *srmmu_ctx_table_phys;
51 static int smp_processors_ready;
52 extern volatile unsigned long cpu_callin_map[NR_CPUS];
53 extern unsigned char boot_cpu_id;
54 extern cpumask_t smp_commenced_mask;
55 void __init leon_configure_cache_smp(void);
56
do_swap(volatile unsigned long * ptr,unsigned long val)57 static inline unsigned long do_swap(volatile unsigned long *ptr,
58 unsigned long val)
59 {
60 __asm__ __volatile__("swapa [%2] %3, %0\n\t" : "=&r"(val)
61 : "0"(val), "r"(ptr), "i"(ASI_LEON_DCACHE_MISS)
62 : "memory");
63 return val;
64 }
65
66 static void smp_setup_percpu_timer(void);
67
leon_callin(void)68 void __cpuinit leon_callin(void)
69 {
70 int cpuid = hard_smpleon_processor_id();
71
72 local_flush_cache_all();
73 local_flush_tlb_all();
74 leon_configure_cache_smp();
75
76 /* Get our local ticker going. */
77 smp_setup_percpu_timer();
78
79 calibrate_delay();
80 smp_store_cpu_info(cpuid);
81
82 local_flush_cache_all();
83 local_flush_tlb_all();
84
85 /*
86 * Unblock the master CPU _only_ when the scheduler state
87 * of all secondary CPUs will be up-to-date, so after
88 * the SMP initialization the master will be just allowed
89 * to call the scheduler code.
90 * Allow master to continue.
91 */
92 do_swap(&cpu_callin_map[cpuid], 1);
93
94 local_flush_cache_all();
95 local_flush_tlb_all();
96
97 cpu_probe();
98
99 /* Fix idle thread fields. */
100 __asm__ __volatile__("ld [%0], %%g6\n\t" : : "r"(¤t_set[cpuid])
101 : "memory" /* paranoid */);
102
103 /* Attach to the address space of init_task. */
104 atomic_inc(&init_mm.mm_count);
105 current->active_mm = &init_mm;
106
107 while (!cpu_isset(cpuid, smp_commenced_mask))
108 mb();
109
110 local_irq_enable();
111 cpu_set(cpuid, cpu_online_map);
112 }
113
114 /*
115 * Cycle through the processors asking the PROM to start each one.
116 */
117
118 extern struct linux_prom_registers smp_penguin_ctable;
119
leon_configure_cache_smp(void)120 void __init leon_configure_cache_smp(void)
121 {
122 unsigned long cfg = sparc_leon3_get_dcachecfg();
123 int me = smp_processor_id();
124
125 if (ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg) > 4) {
126 printk(KERN_INFO "Note: SMP with snooping only works on 4k cache, found %dk(0x%x) on cpu %d, disabling caches\n",
127 (unsigned int)ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg),
128 (unsigned int)cfg, (unsigned int)me);
129 sparc_leon3_disable_cache();
130 } else {
131 if (cfg & ASI_LEON3_SYSCTRL_CFG_SNOOPING) {
132 sparc_leon3_enable_snooping();
133 } else {
134 printk(KERN_INFO "Note: You have to enable snooping in the vhdl model cpu %d, disabling caches\n",
135 me);
136 sparc_leon3_disable_cache();
137 }
138 }
139
140 local_flush_cache_all();
141 local_flush_tlb_all();
142 }
143
leon_smp_setbroadcast(unsigned int mask)144 void leon_smp_setbroadcast(unsigned int mask)
145 {
146 int broadcast =
147 ((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
148 LEON3_IRQMPSTATUS_BROADCAST) & 1);
149 if (!broadcast) {
150 prom_printf("######## !!!! The irqmp-ctrl must have broadcast enabled, smp wont work !!!!! ####### nr cpus: %d\n",
151 leon_smp_nrcpus());
152 if (leon_smp_nrcpus() > 1) {
153 BUG();
154 } else {
155 prom_printf("continue anyway\n");
156 return;
157 }
158 }
159 LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpbroadcast), mask);
160 }
161
leon_smp_getbroadcast(void)162 unsigned int leon_smp_getbroadcast(void)
163 {
164 unsigned int mask;
165 mask = LEON_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpbroadcast));
166 return mask;
167 }
168
leon_smp_nrcpus(void)169 int leon_smp_nrcpus(void)
170 {
171 int nrcpu =
172 ((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
173 LEON3_IRQMPSTATUS_CPUNR) & 0xf) + 1;
174 return nrcpu;
175 }
176
leon_boot_cpus(void)177 void __init leon_boot_cpus(void)
178 {
179 int nrcpu = leon_smp_nrcpus();
180 int me = smp_processor_id();
181
182 printk(KERN_INFO "%d:(%d:%d) cpus mpirq at 0x%x\n", (unsigned int)me,
183 (unsigned int)nrcpu, (unsigned int)NR_CPUS,
184 (unsigned int)&(leon3_irqctrl_regs->mpstatus));
185
186 leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, me);
187 leon_enable_irq_cpu(LEON3_IRQ_TICKER, me);
188 leon_enable_irq_cpu(LEON3_IRQ_RESCHEDULE, me);
189
190 leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER);
191
192 leon_configure_cache_smp();
193 smp_setup_percpu_timer();
194 local_flush_cache_all();
195
196 }
197
leon_boot_one_cpu(int i)198 int __cpuinit leon_boot_one_cpu(int i)
199 {
200
201 struct task_struct *p;
202 int timeout;
203
204 /* Cook up an idler for this guy. */
205 p = fork_idle(i);
206
207 current_set[i] = task_thread_info(p);
208
209 /* See trampoline.S:leon_smp_cpu_startup for details...
210 * Initialize the contexts table
211 * Since the call to prom_startcpu() trashes the structure,
212 * we need to re-initialize it for each cpu
213 */
214 smp_penguin_ctable.which_io = 0;
215 smp_penguin_ctable.phys_addr = (unsigned int)srmmu_ctx_table_phys;
216 smp_penguin_ctable.reg_size = 0;
217
218 /* whirrr, whirrr, whirrrrrrrrr... */
219 printk(KERN_INFO "Starting CPU %d : (irqmp: 0x%x)\n", (unsigned int)i,
220 (unsigned int)&leon3_irqctrl_regs->mpstatus);
221 local_flush_cache_all();
222
223 LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpstatus), 1 << i);
224
225 /* wheee... it's going... */
226 for (timeout = 0; timeout < 10000; timeout++) {
227 if (cpu_callin_map[i])
228 break;
229 udelay(200);
230 }
231 printk(KERN_INFO "Started CPU %d\n", (unsigned int)i);
232
233 if (!(cpu_callin_map[i])) {
234 printk(KERN_ERR "Processor %d is stuck.\n", i);
235 return -ENODEV;
236 } else {
237 leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, i);
238 leon_enable_irq_cpu(LEON3_IRQ_TICKER, i);
239 leon_enable_irq_cpu(LEON3_IRQ_RESCHEDULE, i);
240 }
241
242 local_flush_cache_all();
243 return 0;
244 }
245
leon_smp_done(void)246 void __init leon_smp_done(void)
247 {
248
249 int i, first;
250 int *prev;
251
252 /* setup cpu list for irq rotation */
253 first = 0;
254 prev = &first;
255 for (i = 0; i < NR_CPUS; i++) {
256 if (cpu_online(i)) {
257 *prev = i;
258 prev = &cpu_data(i).next;
259 }
260 }
261 *prev = first;
262 local_flush_cache_all();
263
264 /* Free unneeded trap tables */
265 if (!cpu_isset(1, cpu_present_map)) {
266 ClearPageReserved(virt_to_page(&trapbase_cpu1));
267 init_page_count(virt_to_page(&trapbase_cpu1));
268 free_page((unsigned long)&trapbase_cpu1);
269 totalram_pages++;
270 num_physpages++;
271 }
272 if (!cpu_isset(2, cpu_present_map)) {
273 ClearPageReserved(virt_to_page(&trapbase_cpu2));
274 init_page_count(virt_to_page(&trapbase_cpu2));
275 free_page((unsigned long)&trapbase_cpu2);
276 totalram_pages++;
277 num_physpages++;
278 }
279 if (!cpu_isset(3, cpu_present_map)) {
280 ClearPageReserved(virt_to_page(&trapbase_cpu3));
281 init_page_count(virt_to_page(&trapbase_cpu3));
282 free_page((unsigned long)&trapbase_cpu3);
283 totalram_pages++;
284 num_physpages++;
285 }
286 /* Ok, they are spinning and ready to go. */
287 smp_processors_ready = 1;
288
289 }
290
leon_irq_rotate(int cpu)291 void leon_irq_rotate(int cpu)
292 {
293 }
294
295 static struct smp_funcall {
296 smpfunc_t func;
297 unsigned long arg1;
298 unsigned long arg2;
299 unsigned long arg3;
300 unsigned long arg4;
301 unsigned long arg5;
302 unsigned long processors_in[NR_CPUS]; /* Set when ipi entered. */
303 unsigned long processors_out[NR_CPUS]; /* Set when ipi exited. */
304 } ccall_info;
305
306 static DEFINE_SPINLOCK(cross_call_lock);
307
308 /* Cross calls must be serialized, at least currently. */
leon_cross_call(smpfunc_t func,cpumask_t mask,unsigned long arg1,unsigned long arg2,unsigned long arg3,unsigned long arg4)309 static void leon_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
310 unsigned long arg2, unsigned long arg3,
311 unsigned long arg4)
312 {
313 if (smp_processors_ready) {
314 register int high = NR_CPUS - 1;
315 unsigned long flags;
316
317 spin_lock_irqsave(&cross_call_lock, flags);
318
319 {
320 /* If you make changes here, make sure gcc generates proper code... */
321 register smpfunc_t f asm("i0") = func;
322 register unsigned long a1 asm("i1") = arg1;
323 register unsigned long a2 asm("i2") = arg2;
324 register unsigned long a3 asm("i3") = arg3;
325 register unsigned long a4 asm("i4") = arg4;
326 register unsigned long a5 asm("i5") = 0;
327
328 __asm__ __volatile__("std %0, [%6]\n\t"
329 "std %2, [%6 + 8]\n\t"
330 "std %4, [%6 + 16]\n\t" : :
331 "r"(f), "r"(a1), "r"(a2), "r"(a3),
332 "r"(a4), "r"(a5),
333 "r"(&ccall_info.func));
334 }
335
336 /* Init receive/complete mapping, plus fire the IPI's off. */
337 {
338 register int i;
339
340 cpu_clear(smp_processor_id(), mask);
341 cpus_and(mask, cpu_online_map, mask);
342 for (i = 0; i <= high; i++) {
343 if (cpu_isset(i, mask)) {
344 ccall_info.processors_in[i] = 0;
345 ccall_info.processors_out[i] = 0;
346 set_cpu_int(i, LEON3_IRQ_CROSS_CALL);
347
348 }
349 }
350 }
351
352 {
353 register int i;
354
355 i = 0;
356 do {
357 if (!cpu_isset(i, mask))
358 continue;
359
360 while (!ccall_info.processors_in[i])
361 barrier();
362 } while (++i <= high);
363
364 i = 0;
365 do {
366 if (!cpu_isset(i, mask))
367 continue;
368
369 while (!ccall_info.processors_out[i])
370 barrier();
371 } while (++i <= high);
372 }
373
374 spin_unlock_irqrestore(&cross_call_lock, flags);
375 }
376 }
377
378 /* Running cross calls. */
leon_cross_call_irq(void)379 void leon_cross_call_irq(void)
380 {
381 int i = smp_processor_id();
382
383 ccall_info.processors_in[i] = 1;
384 ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
385 ccall_info.arg4, ccall_info.arg5);
386 ccall_info.processors_out[i] = 1;
387 }
388
leon_percpu_timer_interrupt(struct pt_regs * regs)389 void leon_percpu_timer_interrupt(struct pt_regs *regs)
390 {
391 struct pt_regs *old_regs;
392 int cpu = smp_processor_id();
393
394 old_regs = set_irq_regs(regs);
395
396 leon_clear_profile_irq(cpu);
397
398 profile_tick(CPU_PROFILING);
399
400 if (!--prof_counter(cpu)) {
401 int user = user_mode(regs);
402
403 irq_enter();
404 update_process_times(user);
405 irq_exit();
406
407 prof_counter(cpu) = prof_multiplier(cpu);
408 }
409 set_irq_regs(old_regs);
410 }
411
smp_setup_percpu_timer(void)412 static void __init smp_setup_percpu_timer(void)
413 {
414 int cpu = smp_processor_id();
415
416 prof_counter(cpu) = prof_multiplier(cpu) = 1;
417 }
418
leon_blackbox_id(unsigned * addr)419 void __init leon_blackbox_id(unsigned *addr)
420 {
421 int rd = *addr & 0x3e000000;
422 int rs1 = rd >> 11;
423
424 /* patch places where ___b_hard_smp_processor_id appears */
425 addr[0] = 0x81444000 | rd; /* rd %asr17, reg */
426 addr[1] = 0x8130201c | rd | rs1; /* srl reg, 0x1c, reg */
427 addr[2] = 0x01000000; /* nop */
428 }
429
leon_blackbox_current(unsigned * addr)430 void __init leon_blackbox_current(unsigned *addr)
431 {
432 int rd = *addr & 0x3e000000;
433 int rs1 = rd >> 11;
434
435 /* patch LOAD_CURRENT macro where ___b_load_current appears */
436 addr[0] = 0x81444000 | rd; /* rd %asr17, reg */
437 addr[2] = 0x8130201c | rd | rs1; /* srl reg, 0x1c, reg */
438 addr[4] = 0x81282002 | rd | rs1; /* sll reg, 0x2, reg */
439
440 }
441
leon_init_smp(void)442 void __init leon_init_smp(void)
443 {
444 /* Patch ipi15 trap table */
445 t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_leon - linux_trap_ipi15_sun4m);
446
447 BTFIXUPSET_BLACKBOX(hard_smp_processor_id, leon_blackbox_id);
448 BTFIXUPSET_BLACKBOX(load_current, leon_blackbox_current);
449 BTFIXUPSET_CALL(smp_cross_call, leon_cross_call, BTFIXUPCALL_NORM);
450 BTFIXUPSET_CALL(__hard_smp_processor_id, __leon_processor_id,
451 BTFIXUPCALL_NORM);
452 }
453
454 #endif /* CONFIG_SPARC_LEON */
455