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Linux/arch/sparc/kernel/smp_32.c

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  1 /* smp.c: Sparc SMP support.
  2  *
  3  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
  4  * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
  5  * Copyright (C) 2004 Keith M Wesolowski (wesolows@foobazco.org)
  6  */
  7 
  8 #include <asm/head.h>
  9 
 10 #include <linux/kernel.h>
 11 #include <linux/sched.h>
 12 #include <linux/threads.h>
 13 #include <linux/smp.h>
 14 #include <linux/interrupt.h>
 15 #include <linux/kernel_stat.h>
 16 #include <linux/init.h>
 17 #include <linux/spinlock.h>
 18 #include <linux/mm.h>
 19 #include <linux/fs.h>
 20 #include <linux/seq_file.h>
 21 #include <linux/cache.h>
 22 #include <linux/delay.h>
 23 #include <linux/profile.h>
 24 #include <linux/cpu.h>
 25 
 26 #include <asm/ptrace.h>
 27 #include <linux/atomic.h>
 28 
 29 #include <asm/irq.h>
 30 #include <asm/page.h>
 31 #include <asm/pgalloc.h>
 32 #include <asm/pgtable.h>
 33 #include <asm/oplib.h>
 34 #include <asm/cacheflush.h>
 35 #include <asm/tlbflush.h>
 36 #include <asm/cpudata.h>
 37 #include <asm/timer.h>
 38 #include <asm/leon.h>
 39 
 40 #include "kernel.h"
 41 #include "irq.h"
 42 
 43 volatile unsigned long cpu_callin_map[NR_CPUS] = {0,};
 44 
 45 cpumask_t smp_commenced_mask = CPU_MASK_NONE;
 46 
 47 const struct sparc32_ipi_ops *sparc32_ipi_ops;
 48 
 49 /* The only guaranteed locking primitive available on all Sparc
 50  * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically
 51  * places the current byte at the effective address into dest_reg and
 52  * places 0xff there afterwards.  Pretty lame locking primitive
 53  * compared to the Alpha and the Intel no?  Most Sparcs have 'swap'
 54  * instruction which is much better...
 55  */
 56 
 57 void smp_store_cpu_info(int id)
 58 {
 59         int cpu_node;
 60         int mid;
 61 
 62         cpu_data(id).udelay_val = loops_per_jiffy;
 63 
 64         cpu_find_by_mid(id, &cpu_node);
 65         cpu_data(id).clock_tick = prom_getintdefault(cpu_node,
 66                                                      "clock-frequency", 0);
 67         cpu_data(id).prom_node = cpu_node;
 68         mid = cpu_get_hwmid(cpu_node);
 69 
 70         if (mid < 0) {
 71                 printk(KERN_NOTICE "No MID found for CPU%d at node 0x%08x", id, cpu_node);
 72                 mid = 0;
 73         }
 74         cpu_data(id).mid = mid;
 75 }
 76 
 77 void __init smp_cpus_done(unsigned int max_cpus)
 78 {
 79         unsigned long bogosum = 0;
 80         int cpu, num = 0;
 81 
 82         for_each_online_cpu(cpu) {
 83                 num++;
 84                 bogosum += cpu_data(cpu).udelay_val;
 85         }
 86 
 87         printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
 88                 num, bogosum/(500000/HZ),
 89                 (bogosum/(5000/HZ))%100);
 90 
 91         switch(sparc_cpu_model) {
 92         case sun4m:
 93                 smp4m_smp_done();
 94                 break;
 95         case sun4d:
 96                 smp4d_smp_done();
 97                 break;
 98         case sparc_leon:
 99                 leon_smp_done();
100                 break;
101         case sun4e:
102                 printk("SUN4E\n");
103                 BUG();
104                 break;
105         case sun4u:
106                 printk("SUN4U\n");
107                 BUG();
108                 break;
109         default:
110                 printk("UNKNOWN!\n");
111                 BUG();
112                 break;
113         }
114 }
115 
116 void cpu_panic(void)
117 {
118         printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
119         panic("SMP bolixed\n");
120 }
121 
122 struct linux_prom_registers smp_penguin_ctable = { 0 };
123 
124 void smp_send_reschedule(int cpu)
125 {
126         /*
127          * CPU model dependent way of implementing IPI generation targeting
128          * a single CPU. The trap handler needs only to do trap entry/return
129          * to call schedule.
130          */
131         sparc32_ipi_ops->resched(cpu);
132 }
133 
134 void smp_send_stop(void)
135 {
136 }
137 
138 void arch_send_call_function_single_ipi(int cpu)
139 {
140         /* trigger one IPI single call on one CPU */
141         sparc32_ipi_ops->single(cpu);
142 }
143 
144 void arch_send_call_function_ipi_mask(const struct cpumask *mask)
145 {
146         int cpu;
147 
148         /* trigger IPI mask call on each CPU */
149         for_each_cpu(cpu, mask)
150                 sparc32_ipi_ops->mask_one(cpu);
151 }
152 
153 void smp_resched_interrupt(void)
154 {
155         irq_enter();
156         scheduler_ipi();
157         local_cpu_data().irq_resched_count++;
158         irq_exit();
159         /* re-schedule routine called by interrupt return code. */
160 }
161 
162 void smp_call_function_single_interrupt(void)
163 {
164         irq_enter();
165         generic_smp_call_function_single_interrupt();
166         local_cpu_data().irq_call_count++;
167         irq_exit();
168 }
169 
170 void smp_call_function_interrupt(void)
171 {
172         irq_enter();
173         generic_smp_call_function_interrupt();
174         local_cpu_data().irq_call_count++;
175         irq_exit();
176 }
177 
178 int setup_profiling_timer(unsigned int multiplier)
179 {
180         return -EINVAL;
181 }
182 
183 void __init smp_prepare_cpus(unsigned int max_cpus)
184 {
185         int i, cpuid, extra;
186 
187         printk("Entering SMP Mode...\n");
188 
189         extra = 0;
190         for (i = 0; !cpu_find_by_instance(i, NULL, &cpuid); i++) {
191                 if (cpuid >= NR_CPUS)
192                         extra++;
193         }
194         /* i = number of cpus */
195         if (extra && max_cpus > i - extra)
196                 printk("Warning: NR_CPUS is too low to start all cpus\n");
197 
198         smp_store_cpu_info(boot_cpu_id);
199 
200         switch(sparc_cpu_model) {
201         case sun4m:
202                 smp4m_boot_cpus();
203                 break;
204         case sun4d:
205                 smp4d_boot_cpus();
206                 break;
207         case sparc_leon:
208                 leon_boot_cpus();
209                 break;
210         case sun4e:
211                 printk("SUN4E\n");
212                 BUG();
213                 break;
214         case sun4u:
215                 printk("SUN4U\n");
216                 BUG();
217                 break;
218         default:
219                 printk("UNKNOWN!\n");
220                 BUG();
221                 break;
222         }
223 }
224 
225 /* Set this up early so that things like the scheduler can init
226  * properly.  We use the same cpu mask for both the present and
227  * possible cpu map.
228  */
229 void __init smp_setup_cpu_possible_map(void)
230 {
231         int instance, mid;
232 
233         instance = 0;
234         while (!cpu_find_by_instance(instance, NULL, &mid)) {
235                 if (mid < NR_CPUS) {
236                         set_cpu_possible(mid, true);
237                         set_cpu_present(mid, true);
238                 }
239                 instance++;
240         }
241 }
242 
243 void __init smp_prepare_boot_cpu(void)
244 {
245         int cpuid = hard_smp_processor_id();
246 
247         if (cpuid >= NR_CPUS) {
248                 prom_printf("Serious problem, boot cpu id >= NR_CPUS\n");
249                 prom_halt();
250         }
251         if (cpuid != 0)
252                 printk("boot cpu id != 0, this could work but is untested\n");
253 
254         current_thread_info()->cpu = cpuid;
255         set_cpu_online(cpuid, true);
256         set_cpu_possible(cpuid, true);
257 }
258 
259 int __cpu_up(unsigned int cpu, struct task_struct *tidle)
260 {
261         int ret=0;
262 
263         switch(sparc_cpu_model) {
264         case sun4m:
265                 ret = smp4m_boot_one_cpu(cpu, tidle);
266                 break;
267         case sun4d:
268                 ret = smp4d_boot_one_cpu(cpu, tidle);
269                 break;
270         case sparc_leon:
271                 ret = leon_boot_one_cpu(cpu, tidle);
272                 break;
273         case sun4e:
274                 printk("SUN4E\n");
275                 BUG();
276                 break;
277         case sun4u:
278                 printk("SUN4U\n");
279                 BUG();
280                 break;
281         default:
282                 printk("UNKNOWN!\n");
283                 BUG();
284                 break;
285         }
286 
287         if (!ret) {
288                 cpumask_set_cpu(cpu, &smp_commenced_mask);
289                 while (!cpu_online(cpu))
290                         mb();
291         }
292         return ret;
293 }
294 
295 static void arch_cpu_pre_starting(void *arg)
296 {
297         local_ops->cache_all();
298         local_ops->tlb_all();
299 
300         switch(sparc_cpu_model) {
301         case sun4m:
302                 sun4m_cpu_pre_starting(arg);
303                 break;
304         case sun4d:
305                 sun4d_cpu_pre_starting(arg);
306                 break;
307         case sparc_leon:
308                 leon_cpu_pre_starting(arg);
309                 break;
310         default:
311                 BUG();
312         }
313 }
314 
315 static void arch_cpu_pre_online(void *arg)
316 {
317         unsigned int cpuid = hard_smp_processor_id();
318 
319         register_percpu_ce(cpuid);
320 
321         calibrate_delay();
322         smp_store_cpu_info(cpuid);
323 
324         local_ops->cache_all();
325         local_ops->tlb_all();
326 
327         switch(sparc_cpu_model) {
328         case sun4m:
329                 sun4m_cpu_pre_online(arg);
330                 break;
331         case sun4d:
332                 sun4d_cpu_pre_online(arg);
333                 break;
334         case sparc_leon:
335                 leon_cpu_pre_online(arg);
336                 break;
337         default:
338                 BUG();
339         }
340 }
341 
342 static void sparc_start_secondary(void *arg)
343 {
344         unsigned int cpu;
345 
346         /*
347          * SMP booting is extremely fragile in some architectures. So run
348          * the cpu initialization code first before anything else.
349          */
350         arch_cpu_pre_starting(arg);
351 
352         preempt_disable();
353         cpu = smp_processor_id();
354 
355         /* Invoke the CPU_STARTING notifier callbacks */
356         notify_cpu_starting(cpu);
357 
358         arch_cpu_pre_online(arg);
359 
360         /* Set the CPU in the cpu_online_mask */
361         set_cpu_online(cpu, true);
362 
363         /* Enable local interrupts now */
364         local_irq_enable();
365 
366         wmb();
367         cpu_startup_entry(CPUHP_ONLINE);
368 
369         /* We should never reach here! */
370         BUG();
371 }
372 
373 void smp_callin(void)
374 {
375         sparc_start_secondary(NULL);
376 }
377 
378 void smp_bogo(struct seq_file *m)
379 {
380         int i;
381         
382         for_each_online_cpu(i) {
383                 seq_printf(m,
384                            "Cpu%dBogo\t: %lu.%02lu\n",
385                            i,
386                            cpu_data(i).udelay_val/(500000/HZ),
387                            (cpu_data(i).udelay_val/(5000/HZ))%100);
388         }
389 }
390 
391 void smp_info(struct seq_file *m)
392 {
393         int i;
394 
395         seq_printf(m, "State:\n");
396         for_each_online_cpu(i)
397                 seq_printf(m, "CPU%d\t\t: online\n", i);
398 }
399 

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