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19#include <linux/types.h>
20#include <linux/spinlock.h>
21#include <linux/slab.h>
22
23#include <linux/kernel.h>
24#include <linux/module.h>
25#include <linux/sched.h>
26#include <linux/init.h>
27#include <linux/interrupt.h>
28#include <linux/smp.h>
29#include <linux/kernel_stat.h>
30#include <linux/mm.h>
31#include <linux/err.h>
32#include <linux/delay.h>
33#include <linux/bitops.h>
34#include <linux/ftrace.h>
35
36#include <asm/system.h>
37#include <asm/atomic.h>
38#include <asm/current.h>
39#include <asm/delay.h>
40#include <asm/tlbflush.h>
41
42#include <asm/io.h>
43#include <asm/irq.h>
44#include <asm/mmu_context.h>
45#include <asm/page.h>
46#include <asm/pgtable.h>
47#include <asm/pgalloc.h>
48#include <asm/processor.h>
49#include <asm/ptrace.h>
50#include <asm/unistd.h>
51#include <asm/cacheflush.h>
52
53#undef DEBUG_SMP
54#ifdef DEBUG_SMP
55static int smp_debug_lvl = 0;
56#define smp_debug(lvl, printargs...) \
57 if (lvl >= smp_debug_lvl) \
58 printk(printargs);
59#else
60#define smp_debug(lvl, ...) do { } while(0)
61#endif
62
63DEFINE_SPINLOCK(smp_lock);
64
65volatile struct task_struct *smp_init_current_idle_task;
66
67
68static volatile int cpu_now_booting __cpuinitdata;
69
70static int parisc_max_cpus __cpuinitdata = 1;
71
72DEFINE_PER_CPU(spinlock_t, ipi_lock) = SPIN_LOCK_UNLOCKED;
73
74enum ipi_message_type {
75 IPI_NOP=0,
76 IPI_RESCHEDULE=1,
77 IPI_CALL_FUNC,
78 IPI_CALL_FUNC_SINGLE,
79 IPI_CPU_START,
80 IPI_CPU_STOP,
81 IPI_CPU_TEST
82};
83
84
85
86
87#undef PER_CPU_IRQ_REGION
88#ifdef PER_CPU_IRQ_REGION
89
90
91
92
93static void
94ipi_init(int cpuid)
95{
96#error verify IRQ_OFFSET(IPI_IRQ) is ipi_interrupt() in new IRQ region
97
98 if(cpu_online(cpuid) )
99 {
100 switch_to_idle_task(current);
101 }
102
103 return;
104}
105#endif
106
107
108
109
110
111
112static void
113halt_processor(void)
114{
115
116
117 set_cpu_online(smp_processor_id(), false);
118 local_irq_disable();
119 for (;;)
120 ;
121}
122
123
124irqreturn_t __irq_entry
125ipi_interrupt(int irq, void *dev_id)
126{
127 int this_cpu = smp_processor_id();
128 struct cpuinfo_parisc *p = &per_cpu(cpu_data, this_cpu);
129 unsigned long ops;
130 unsigned long flags;
131
132
133 p->ipi_count++;
134
135 mb();
136
137 for (;;) {
138 spinlock_t *lock = &per_cpu(ipi_lock, this_cpu);
139 spin_lock_irqsave(lock, flags);
140 ops = p->pending_ipi;
141 p->pending_ipi = 0;
142 spin_unlock_irqrestore(lock, flags);
143
144 mb();
145
146 if (!ops)
147 break;
148
149 while (ops) {
150 unsigned long which = ffz(~ops);
151
152 ops &= ~(1 << which);
153
154 switch (which) {
155 case IPI_NOP:
156 smp_debug(100, KERN_DEBUG "CPU%d IPI_NOP\n", this_cpu);
157 break;
158
159 case IPI_RESCHEDULE:
160 smp_debug(100, KERN_DEBUG "CPU%d IPI_RESCHEDULE\n", this_cpu);
161
162
163
164
165 break;
166
167 case IPI_CALL_FUNC:
168 smp_debug(100, KERN_DEBUG "CPU%d IPI_CALL_FUNC\n", this_cpu);
169 generic_smp_call_function_interrupt();
170 break;
171
172 case IPI_CALL_FUNC_SINGLE:
173 smp_debug(100, KERN_DEBUG "CPU%d IPI_CALL_FUNC_SINGLE\n", this_cpu);
174 generic_smp_call_function_single_interrupt();
175 break;
176
177 case IPI_CPU_START:
178 smp_debug(100, KERN_DEBUG "CPU%d IPI_CPU_START\n", this_cpu);
179 break;
180
181 case IPI_CPU_STOP:
182 smp_debug(100, KERN_DEBUG "CPU%d IPI_CPU_STOP\n", this_cpu);
183 halt_processor();
184 break;
185
186 case IPI_CPU_TEST:
187 smp_debug(100, KERN_DEBUG "CPU%d is alive!\n", this_cpu);
188 break;
189
190 default:
191 printk(KERN_CRIT "Unknown IPI num on CPU%d: %lu\n",
192 this_cpu, which);
193 return IRQ_NONE;
194 }
195
196 local_irq_enable();
197 local_irq_disable();
198 }
199 }
200 return IRQ_HANDLED;
201}
202
203
204static inline void
205ipi_send(int cpu, enum ipi_message_type op)
206{
207 struct cpuinfo_parisc *p = &per_cpu(cpu_data, cpu);
208 spinlock_t *lock = &per_cpu(ipi_lock, cpu);
209 unsigned long flags;
210
211 spin_lock_irqsave(lock, flags);
212 p->pending_ipi |= 1 << op;
213 gsc_writel(IPI_IRQ - CPU_IRQ_BASE, p->hpa);
214 spin_unlock_irqrestore(lock, flags);
215}
216
217static void
218send_IPI_mask(const struct cpumask *mask, enum ipi_message_type op)
219{
220 int cpu;
221
222 for_each_cpu(cpu, mask)
223 ipi_send(cpu, op);
224}
225
226static inline void
227send_IPI_single(int dest_cpu, enum ipi_message_type op)
228{
229 BUG_ON(dest_cpu == NO_PROC_ID);
230
231 ipi_send(dest_cpu, op);
232}
233
234static inline void
235send_IPI_allbutself(enum ipi_message_type op)
236{
237 int i;
238
239 for_each_online_cpu(i) {
240 if (i != smp_processor_id())
241 send_IPI_single(i, op);
242 }
243}
244
245
246inline void
247smp_send_stop(void) { send_IPI_allbutself(IPI_CPU_STOP); }
248
249static inline void
250smp_send_start(void) { send_IPI_allbutself(IPI_CPU_START); }
251
252void
253smp_send_reschedule(int cpu) { send_IPI_single(cpu, IPI_RESCHEDULE); }
254
255void
256smp_send_all_nop(void)
257{
258 send_IPI_allbutself(IPI_NOP);
259}
260
261void arch_send_call_function_ipi_mask(const struct cpumask *mask)
262{
263 send_IPI_mask(mask, IPI_CALL_FUNC);
264}
265
266void arch_send_call_function_single_ipi(int cpu)
267{
268 send_IPI_single(cpu, IPI_CALL_FUNC_SINGLE);
269}
270
271
272
273
274
275
276void
277smp_flush_tlb_all(void)
278{
279 on_each_cpu(flush_tlb_all_local, NULL, 1);
280}
281
282
283
284
285static void __init
286smp_cpu_init(int cpunum)
287{
288 extern int init_per_cpu(int);
289 extern void init_IRQ(void);
290 extern void start_cpu_itimer(void);
291
292
293 (void) init_per_cpu(cpunum);
294
295 disable_sr_hashing();
296
297 mb();
298
299
300 if (cpu_isset(cpunum, cpu_online_map))
301 {
302 extern void machine_halt(void);
303
304 printk(KERN_CRIT "CPU#%d already initialized!\n", cpunum);
305 machine_halt();
306 }
307 set_cpu_online(cpunum, true);
308
309
310 atomic_inc(&init_mm.mm_count);
311 current->active_mm = &init_mm;
312 BUG_ON(current->mm);
313 enter_lazy_tlb(&init_mm, current);
314
315 init_IRQ();
316 start_cpu_itimer();
317}
318
319
320
321
322
323
324void __init smp_callin(void)
325{
326 int slave_id = cpu_now_booting;
327
328 smp_cpu_init(slave_id);
329 preempt_disable();
330
331 flush_cache_all_local();
332 flush_tlb_all_local(NULL);
333
334 local_irq_enable();
335
336 cpu_idle();
337
338
339 panic("smp_callin() AAAAaaaaahhhh....\n");
340}
341
342
343
344
345int __cpuinit smp_boot_one_cpu(int cpuid)
346{
347 const struct cpuinfo_parisc *p = &per_cpu(cpu_data, cpuid);
348 struct task_struct *idle;
349 long timeout;
350
351
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353
354
355
356
357
358
359
360
361 idle = fork_idle(cpuid);
362 if (IS_ERR(idle))
363 panic("SMP: fork failed for CPU:%d", cpuid);
364
365 task_thread_info(idle)->cpu = cpuid;
366
367
368
369
370 cpu_now_booting = cpuid;
371
372
373
374
375
376 smp_init_current_idle_task = idle ;
377 mb();
378
379 printk(KERN_INFO "Releasing cpu %d now, hpa=%lx\n", cpuid, p->hpa);
380
381
382
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384
385
386
387
388
389
390 gsc_writel(TIMER_IRQ - CPU_IRQ_BASE, p->hpa);
391 mb();
392
393
394
395
396
397
398 for (timeout = 0; timeout < 10000; timeout++) {
399 if(cpu_online(cpuid)) {
400
401 cpu_now_booting = 0;
402 smp_init_current_idle_task = NULL;
403 goto alive ;
404 }
405 udelay(100);
406 barrier();
407 }
408
409 put_task_struct(idle);
410 idle = NULL;
411
412 printk(KERN_CRIT "SMP: CPU:%d is stuck.\n", cpuid);
413 return -1;
414
415alive:
416
417 smp_debug(100, KERN_DEBUG "SMP: CPU:%d came alive after %ld _us\n",
418 cpuid, timeout * 100);
419 return 0;
420}
421
422void __init smp_prepare_boot_cpu(void)
423{
424 int bootstrap_processor = per_cpu(cpu_data, 0).cpuid;
425
426
427 printk(KERN_INFO "SMP: bootstrap CPU ID is %d\n", bootstrap_processor);
428
429 set_cpu_online(bootstrap_processor, true);
430 set_cpu_present(bootstrap_processor, true);
431}
432
433
434
435
436
437
438
439void __init smp_prepare_cpus(unsigned int max_cpus)
440{
441 init_cpu_present(cpumask_of(0));
442
443 parisc_max_cpus = max_cpus;
444 if (!max_cpus)
445 printk(KERN_INFO "SMP mode deactivated.\n");
446}
447
448
449void smp_cpus_done(unsigned int cpu_max)
450{
451 return;
452}
453
454
455int __cpuinit __cpu_up(unsigned int cpu)
456{
457 if (cpu != 0 && cpu < parisc_max_cpus)
458 smp_boot_one_cpu(cpu);
459
460 return cpu_online(cpu) ? 0 : -ENOSYS;
461}
462
463#ifdef CONFIG_PROC_FS
464int __init
465setup_profiling_timer(unsigned int multiplier)
466{
467 return -EINVAL;
468}
469#endif
470