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Linux/arch/sparc/kernel/smp_32.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /* smp.c: Sparc SMP support.
  3  *
  4  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
  5  * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
  6  * Copyright (C) 2004 Keith M Wesolowski (wesolows@foobazco.org)
  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/fs.h>
 21 #include <linux/seq_file.h>
 22 #include <linux/cache.h>
 23 #include <linux/delay.h>
 24 #include <linux/profile.h>
 25 #include <linux/cpu.h>
 26 
 27 #include <asm/ptrace.h>
 28 #include <linux/atomic.h>
 29 
 30 #include <asm/irq.h>
 31 #include <asm/page.h>
 32 #include <asm/pgalloc.h>
 33 #include <asm/pgtable.h>
 34 #include <asm/oplib.h>
 35 #include <asm/cacheflush.h>
 36 #include <asm/tlbflush.h>
 37 #include <asm/cpudata.h>
 38 #include <asm/timer.h>
 39 #include <asm/leon.h>
 40 
 41 #include "kernel.h"
 42 #include "irq.h"
 43 
 44 volatile unsigned long cpu_callin_map[NR_CPUS] = {0,};
 45 
 46 cpumask_t smp_commenced_mask = CPU_MASK_NONE;
 47 
 48 const struct sparc32_ipi_ops *sparc32_ipi_ops;
 49 
 50 /* The only guaranteed locking primitive available on all Sparc
 51  * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically
 52  * places the current byte at the effective address into dest_reg and
 53  * places 0xff there afterwards.  Pretty lame locking primitive
 54  * compared to the Alpha and the Intel no?  Most Sparcs have 'swap'
 55  * instruction which is much better...
 56  */
 57 
 58 void smp_store_cpu_info(int id)
 59 {
 60         int cpu_node;
 61         int mid;
 62 
 63         cpu_data(id).udelay_val = loops_per_jiffy;
 64 
 65         cpu_find_by_mid(id, &cpu_node);
 66         cpu_data(id).clock_tick = prom_getintdefault(cpu_node,
 67                                                      "clock-frequency", 0);
 68         cpu_data(id).prom_node = cpu_node;
 69         mid = cpu_get_hwmid(cpu_node);
 70 
 71         if (mid < 0) {
 72                 printk(KERN_NOTICE "No MID found for CPU%d at node 0x%08x", id, cpu_node);
 73                 mid = 0;
 74         }
 75         cpu_data(id).mid = mid;
 76 }
 77 
 78 void __init smp_cpus_done(unsigned int max_cpus)
 79 {
 80         unsigned long bogosum = 0;
 81         int cpu, num = 0;
 82 
 83         for_each_online_cpu(cpu) {
 84                 num++;
 85                 bogosum += cpu_data(cpu).udelay_val;
 86         }
 87 
 88         printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
 89                 num, bogosum/(500000/HZ),
 90                 (bogosum/(5000/HZ))%100);
 91 
 92         switch(sparc_cpu_model) {
 93         case sun4m:
 94                 smp4m_smp_done();
 95                 break;
 96         case sun4d:
 97                 smp4d_smp_done();
 98                 break;
 99         case sparc_leon:
100                 leon_smp_done();
101                 break;
102         case sun4e:
103                 printk("SUN4E\n");
104                 BUG();
105                 break;
106         case sun4u:
107                 printk("SUN4U\n");
108                 BUG();
109                 break;
110         default:
111                 printk("UNKNOWN!\n");
112                 BUG();
113                 break;
114         }
115 }
116 
117 void cpu_panic(void)
118 {
119         printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
120         panic("SMP bolixed\n");
121 }
122 
123 struct linux_prom_registers smp_penguin_ctable = { 0 };
124 
125 void smp_send_reschedule(int cpu)
126 {
127         /*
128          * CPU model dependent way of implementing IPI generation targeting
129          * a single CPU. The trap handler needs only to do trap entry/return
130          * to call schedule.
131          */
132         sparc32_ipi_ops->resched(cpu);
133 }
134 
135 void smp_send_stop(void)
136 {
137 }
138 
139 void arch_send_call_function_single_ipi(int cpu)
140 {
141         /* trigger one IPI single call on one CPU */
142         sparc32_ipi_ops->single(cpu);
143 }
144 
145 void arch_send_call_function_ipi_mask(const struct cpumask *mask)
146 {
147         int cpu;
148 
149         /* trigger IPI mask call on each CPU */
150         for_each_cpu(cpu, mask)
151                 sparc32_ipi_ops->mask_one(cpu);
152 }
153 
154 void smp_resched_interrupt(void)
155 {
156         irq_enter();
157         scheduler_ipi();
158         local_cpu_data().irq_resched_count++;
159         irq_exit();
160         /* re-schedule routine called by interrupt return code. */
161 }
162 
163 void smp_call_function_single_interrupt(void)
164 {
165         irq_enter();
166         generic_smp_call_function_single_interrupt();
167         local_cpu_data().irq_call_count++;
168         irq_exit();
169 }
170 
171 void smp_call_function_interrupt(void)
172 {
173         irq_enter();
174         generic_smp_call_function_interrupt();
175         local_cpu_data().irq_call_count++;
176         irq_exit();
177 }
178 
179 int setup_profiling_timer(unsigned int multiplier)
180 {
181         return -EINVAL;
182 }
183 
184 void __init smp_prepare_cpus(unsigned int max_cpus)
185 {
186         int i, cpuid, extra;
187 
188         printk("Entering SMP Mode...\n");
189 
190         extra = 0;
191         for (i = 0; !cpu_find_by_instance(i, NULL, &cpuid); i++) {
192                 if (cpuid >= NR_CPUS)
193                         extra++;
194         }
195         /* i = number of cpus */
196         if (extra && max_cpus > i - extra)
197                 printk("Warning: NR_CPUS is too low to start all cpus\n");
198 
199         smp_store_cpu_info(boot_cpu_id);
200 
201         switch(sparc_cpu_model) {
202         case sun4m:
203                 smp4m_boot_cpus();
204                 break;
205         case sun4d:
206                 smp4d_boot_cpus();
207                 break;
208         case sparc_leon:
209                 leon_boot_cpus();
210                 break;
211         case sun4e:
212                 printk("SUN4E\n");
213                 BUG();
214                 break;
215         case sun4u:
216                 printk("SUN4U\n");
217                 BUG();
218                 break;
219         default:
220                 printk("UNKNOWN!\n");
221                 BUG();
222                 break;
223         }
224 }
225 
226 /* Set this up early so that things like the scheduler can init
227  * properly.  We use the same cpu mask for both the present and
228  * possible cpu map.
229  */
230 void __init smp_setup_cpu_possible_map(void)
231 {
232         int instance, mid;
233 
234         instance = 0;
235         while (!cpu_find_by_instance(instance, NULL, &mid)) {
236                 if (mid < NR_CPUS) {
237                         set_cpu_possible(mid, true);
238                         set_cpu_present(mid, true);
239                 }
240                 instance++;
241         }
242 }
243 
244 void __init smp_prepare_boot_cpu(void)
245 {
246         int cpuid = hard_smp_processor_id();
247 
248         if (cpuid >= NR_CPUS) {
249                 prom_printf("Serious problem, boot cpu id >= NR_CPUS\n");
250                 prom_halt();
251         }
252         if (cpuid != 0)
253                 printk("boot cpu id != 0, this could work but is untested\n");
254 
255         current_thread_info()->cpu = cpuid;
256         set_cpu_online(cpuid, true);
257         set_cpu_possible(cpuid, true);
258 }
259 
260 int __cpu_up(unsigned int cpu, struct task_struct *tidle)
261 {
262         int ret=0;
263 
264         switch(sparc_cpu_model) {
265         case sun4m:
266                 ret = smp4m_boot_one_cpu(cpu, tidle);
267                 break;
268         case sun4d:
269                 ret = smp4d_boot_one_cpu(cpu, tidle);
270                 break;
271         case sparc_leon:
272                 ret = leon_boot_one_cpu(cpu, tidle);
273                 break;
274         case sun4e:
275                 printk("SUN4E\n");
276                 BUG();
277                 break;
278         case sun4u:
279                 printk("SUN4U\n");
280                 BUG();
281                 break;
282         default:
283                 printk("UNKNOWN!\n");
284                 BUG();
285                 break;
286         }
287 
288         if (!ret) {
289                 cpumask_set_cpu(cpu, &smp_commenced_mask);
290                 while (!cpu_online(cpu))
291                         mb();
292         }
293         return ret;
294 }
295 
296 static void arch_cpu_pre_starting(void *arg)
297 {
298         local_ops->cache_all();
299         local_ops->tlb_all();
300 
301         switch(sparc_cpu_model) {
302         case sun4m:
303                 sun4m_cpu_pre_starting(arg);
304                 break;
305         case sun4d:
306                 sun4d_cpu_pre_starting(arg);
307                 break;
308         case sparc_leon:
309                 leon_cpu_pre_starting(arg);
310                 break;
311         default:
312                 BUG();
313         }
314 }
315 
316 static void arch_cpu_pre_online(void *arg)
317 {
318         unsigned int cpuid = hard_smp_processor_id();
319 
320         register_percpu_ce(cpuid);
321 
322         calibrate_delay();
323         smp_store_cpu_info(cpuid);
324 
325         local_ops->cache_all();
326         local_ops->tlb_all();
327 
328         switch(sparc_cpu_model) {
329         case sun4m:
330                 sun4m_cpu_pre_online(arg);
331                 break;
332         case sun4d:
333                 sun4d_cpu_pre_online(arg);
334                 break;
335         case sparc_leon:
336                 leon_cpu_pre_online(arg);
337                 break;
338         default:
339                 BUG();
340         }
341 }
342 
343 static void sparc_start_secondary(void *arg)
344 {
345         unsigned int cpu;
346 
347         /*
348          * SMP booting is extremely fragile in some architectures. So run
349          * the cpu initialization code first before anything else.
350          */
351         arch_cpu_pre_starting(arg);
352 
353         preempt_disable();
354         cpu = smp_processor_id();
355 
356         notify_cpu_starting(cpu);
357         arch_cpu_pre_online(arg);
358 
359         /* Set the CPU in the cpu_online_mask */
360         set_cpu_online(cpu, true);
361 
362         /* Enable local interrupts now */
363         local_irq_enable();
364 
365         wmb();
366         cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
367 
368         /* We should never reach here! */
369         BUG();
370 }
371 
372 void smp_callin(void)
373 {
374         sparc_start_secondary(NULL);
375 }
376 
377 void smp_bogo(struct seq_file *m)
378 {
379         int i;
380         
381         for_each_online_cpu(i) {
382                 seq_printf(m,
383                            "Cpu%dBogo\t: %lu.%02lu\n",
384                            i,
385                            cpu_data(i).udelay_val/(500000/HZ),
386                            (cpu_data(i).udelay_val/(5000/HZ))%100);
387         }
388 }
389 
390 void smp_info(struct seq_file *m)
391 {
392         int i;
393 
394         seq_printf(m, "State:\n");
395         for_each_online_cpu(i)
396                 seq_printf(m, "CPU%d\t\t: online\n", i);
397 }
398 

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