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v3.5.6
 
  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
 24#include <asm/ptrace.h>
 25#include <linux/atomic.h>
 26
 27#include <asm/irq.h>
 28#include <asm/page.h>
 29#include <asm/pgalloc.h>
 30#include <asm/pgtable.h>
 31#include <asm/oplib.h>
 32#include <asm/cacheflush.h>
 33#include <asm/tlbflush.h>
 34#include <asm/cpudata.h>
 
 35#include <asm/leon.h>
 36
 
 37#include "irq.h"
 38
 39volatile unsigned long cpu_callin_map[NR_CPUS] __cpuinitdata = {0,};
 40
 41cpumask_t smp_commenced_mask = CPU_MASK_NONE;
 42
 43const struct sparc32_ipi_ops *sparc32_ipi_ops;
 44
 45/* The only guaranteed locking primitive available on all Sparc
 46 * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically
 47 * places the current byte at the effective address into dest_reg and
 48 * places 0xff there afterwards.  Pretty lame locking primitive
 49 * compared to the Alpha and the Intel no?  Most Sparcs have 'swap'
 50 * instruction which is much better...
 51 */
 52
 53void __cpuinit smp_store_cpu_info(int id)
 54{
 55	int cpu_node;
 56	int mid;
 57
 58	cpu_data(id).udelay_val = loops_per_jiffy;
 59
 60	cpu_find_by_mid(id, &cpu_node);
 61	cpu_data(id).clock_tick = prom_getintdefault(cpu_node,
 62						     "clock-frequency", 0);
 63	cpu_data(id).prom_node = cpu_node;
 64	mid = cpu_get_hwmid(cpu_node);
 65
 66	if (mid < 0) {
 67		printk(KERN_NOTICE "No MID found for CPU%d at node 0x%08d", id, cpu_node);
 68		mid = 0;
 69	}
 70	cpu_data(id).mid = mid;
 71}
 72
 73void __init smp_cpus_done(unsigned int max_cpus)
 74{
 75	extern void smp4m_smp_done(void);
 76	extern void smp4d_smp_done(void);
 77	unsigned long bogosum = 0;
 78	int cpu, num = 0;
 79
 80	for_each_online_cpu(cpu) {
 81		num++;
 82		bogosum += cpu_data(cpu).udelay_val;
 83	}
 84
 85	printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
 86		num, bogosum/(500000/HZ),
 87		(bogosum/(5000/HZ))%100);
 88
 89	switch(sparc_cpu_model) {
 90	case sun4m:
 91		smp4m_smp_done();
 92		break;
 93	case sun4d:
 94		smp4d_smp_done();
 95		break;
 96	case sparc_leon:
 97		leon_smp_done();
 98		break;
 99	case sun4e:
100		printk("SUN4E\n");
101		BUG();
102		break;
103	case sun4u:
104		printk("SUN4U\n");
105		BUG();
106		break;
107	default:
108		printk("UNKNOWN!\n");
109		BUG();
110		break;
111	}
112}
113
114void cpu_panic(void)
115{
116	printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
117	panic("SMP bolixed\n");
118}
119
120struct linux_prom_registers smp_penguin_ctable __cpuinitdata = { 0 };
121
122void smp_send_reschedule(int cpu)
123{
124	/*
125	 * CPU model dependent way of implementing IPI generation targeting
126	 * a single CPU. The trap handler needs only to do trap entry/return
127	 * to call schedule.
128	 */
129	sparc32_ipi_ops->resched(cpu);
130}
131
132void smp_send_stop(void)
133{
134}
135
136void arch_send_call_function_single_ipi(int cpu)
137{
138	/* trigger one IPI single call on one CPU */
139	sparc32_ipi_ops->single(cpu);
140}
141
142void arch_send_call_function_ipi_mask(const struct cpumask *mask)
143{
144	int cpu;
145
146	/* trigger IPI mask call on each CPU */
147	for_each_cpu(cpu, mask)
148		sparc32_ipi_ops->mask_one(cpu);
149}
150
151void smp_resched_interrupt(void)
152{
153	irq_enter();
154	scheduler_ipi();
155	local_cpu_data().irq_resched_count++;
156	irq_exit();
157	/* re-schedule routine called by interrupt return code. */
158}
159
160void smp_call_function_single_interrupt(void)
161{
162	irq_enter();
163	generic_smp_call_function_single_interrupt();
164	local_cpu_data().irq_call_count++;
165	irq_exit();
166}
167
168void smp_call_function_interrupt(void)
169{
170	irq_enter();
171	generic_smp_call_function_interrupt();
172	local_cpu_data().irq_call_count++;
173	irq_exit();
174}
175
176int setup_profiling_timer(unsigned int multiplier)
177{
178	return -EINVAL;
179}
180
181void __init smp_prepare_cpus(unsigned int max_cpus)
182{
183	extern void __init smp4m_boot_cpus(void);
184	extern void __init smp4d_boot_cpus(void);
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 */
229void __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
243void __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
259int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *tidle)
260{
261	extern int __cpuinit smp4m_boot_one_cpu(int, struct task_struct *);
262	extern int __cpuinit smp4d_boot_one_cpu(int, struct task_struct *);
263	int ret=0;
264
265	switch(sparc_cpu_model) {
266	case sun4m:
267		ret = smp4m_boot_one_cpu(cpu, tidle);
268		break;
269	case sun4d:
270		ret = smp4d_boot_one_cpu(cpu, tidle);
271		break;
272	case sparc_leon:
273		ret = leon_boot_one_cpu(cpu, tidle);
274		break;
275	case sun4e:
276		printk("SUN4E\n");
277		BUG();
278		break;
279	case sun4u:
280		printk("SUN4U\n");
281		BUG();
282		break;
283	default:
284		printk("UNKNOWN!\n");
285		BUG();
286		break;
287	}
288
289	if (!ret) {
290		cpumask_set_cpu(cpu, &smp_commenced_mask);
291		while (!cpu_online(cpu))
292			mb();
293	}
294	return ret;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
295}
296
297void smp_bogo(struct seq_file *m)
298{
299	int i;
300	
301	for_each_online_cpu(i) {
302		seq_printf(m,
303			   "Cpu%dBogo\t: %lu.%02lu\n",
304			   i,
305			   cpu_data(i).udelay_val/(500000/HZ),
306			   (cpu_data(i).udelay_val/(5000/HZ))%100);
307	}
308}
309
310void smp_info(struct seq_file *m)
311{
312	int i;
313
314	seq_printf(m, "State:\n");
315	for_each_online_cpu(i)
316		seq_printf(m, "CPU%d\t\t: online\n", i);
317}
v5.9
  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/oplib.h>
 33#include <asm/cacheflush.h>
 34#include <asm/tlbflush.h>
 35#include <asm/cpudata.h>
 36#include <asm/timer.h>
 37#include <asm/leon.h>
 38
 39#include "kernel.h"
 40#include "irq.h"
 41
 42volatile unsigned long cpu_callin_map[NR_CPUS] = {0,};
 43
 44cpumask_t smp_commenced_mask = CPU_MASK_NONE;
 45
 46const struct sparc32_ipi_ops *sparc32_ipi_ops;
 47
 48/* The only guaranteed locking primitive available on all Sparc
 49 * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically
 50 * places the current byte at the effective address into dest_reg and
 51 * places 0xff there afterwards.  Pretty lame locking primitive
 52 * compared to the Alpha and the Intel no?  Most Sparcs have 'swap'
 53 * instruction which is much better...
 54 */
 55
 56void smp_store_cpu_info(int id)
 57{
 58	int cpu_node;
 59	int mid;
 60
 61	cpu_data(id).udelay_val = loops_per_jiffy;
 62
 63	cpu_find_by_mid(id, &cpu_node);
 64	cpu_data(id).clock_tick = prom_getintdefault(cpu_node,
 65						     "clock-frequency", 0);
 66	cpu_data(id).prom_node = cpu_node;
 67	mid = cpu_get_hwmid(cpu_node);
 68
 69	if (mid < 0) {
 70		printk(KERN_NOTICE "No MID found for CPU%d at node 0x%08x", id, cpu_node);
 71		mid = 0;
 72	}
 73	cpu_data(id).mid = mid;
 74}
 75
 76void __init smp_cpus_done(unsigned int max_cpus)
 77{
 
 
 78	unsigned long bogosum = 0;
 79	int cpu, num = 0;
 80
 81	for_each_online_cpu(cpu) {
 82		num++;
 83		bogosum += cpu_data(cpu).udelay_val;
 84	}
 85
 86	printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
 87		num, bogosum/(500000/HZ),
 88		(bogosum/(5000/HZ))%100);
 89
 90	switch(sparc_cpu_model) {
 91	case sun4m:
 92		smp4m_smp_done();
 93		break;
 94	case sun4d:
 95		smp4d_smp_done();
 96		break;
 97	case sparc_leon:
 98		leon_smp_done();
 99		break;
100	case sun4e:
101		printk("SUN4E\n");
102		BUG();
103		break;
104	case sun4u:
105		printk("SUN4U\n");
106		BUG();
107		break;
108	default:
109		printk("UNKNOWN!\n");
110		BUG();
111		break;
112	}
113}
114
115void cpu_panic(void)
116{
117	printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
118	panic("SMP bolixed\n");
119}
120
121struct linux_prom_registers smp_penguin_ctable = { 0 };
122
123void smp_send_reschedule(int cpu)
124{
125	/*
126	 * CPU model dependent way of implementing IPI generation targeting
127	 * a single CPU. The trap handler needs only to do trap entry/return
128	 * to call schedule.
129	 */
130	sparc32_ipi_ops->resched(cpu);
131}
132
133void smp_send_stop(void)
134{
135}
136
137void arch_send_call_function_single_ipi(int cpu)
138{
139	/* trigger one IPI single call on one CPU */
140	sparc32_ipi_ops->single(cpu);
141}
142
143void arch_send_call_function_ipi_mask(const struct cpumask *mask)
144{
145	int cpu;
146
147	/* trigger IPI mask call on each CPU */
148	for_each_cpu(cpu, mask)
149		sparc32_ipi_ops->mask_one(cpu);
150}
151
152void smp_resched_interrupt(void)
153{
154	irq_enter();
155	scheduler_ipi();
156	local_cpu_data().irq_resched_count++;
157	irq_exit();
158	/* re-schedule routine called by interrupt return code. */
159}
160
161void smp_call_function_single_interrupt(void)
162{
163	irq_enter();
164	generic_smp_call_function_single_interrupt();
165	local_cpu_data().irq_call_count++;
166	irq_exit();
167}
168
169void smp_call_function_interrupt(void)
170{
171	irq_enter();
172	generic_smp_call_function_interrupt();
173	local_cpu_data().irq_call_count++;
174	irq_exit();
175}
176
177int setup_profiling_timer(unsigned int multiplier)
178{
179	return -EINVAL;
180}
181
182void __init smp_prepare_cpus(unsigned int max_cpus)
183{
 
 
184	int i, cpuid, extra;
185
186	printk("Entering SMP Mode...\n");
187
188	extra = 0;
189	for (i = 0; !cpu_find_by_instance(i, NULL, &cpuid); i++) {
190		if (cpuid >= NR_CPUS)
191			extra++;
192	}
193	/* i = number of cpus */
194	if (extra && max_cpus > i - extra)
195		printk("Warning: NR_CPUS is too low to start all cpus\n");
196
197	smp_store_cpu_info(boot_cpu_id);
198
199	switch(sparc_cpu_model) {
200	case sun4m:
201		smp4m_boot_cpus();
202		break;
203	case sun4d:
204		smp4d_boot_cpus();
205		break;
206	case sparc_leon:
207		leon_boot_cpus();
208		break;
209	case sun4e:
210		printk("SUN4E\n");
211		BUG();
212		break;
213	case sun4u:
214		printk("SUN4U\n");
215		BUG();
216		break;
217	default:
218		printk("UNKNOWN!\n");
219		BUG();
220		break;
221	}
222}
223
224/* Set this up early so that things like the scheduler can init
225 * properly.  We use the same cpu mask for both the present and
226 * possible cpu map.
227 */
228void __init smp_setup_cpu_possible_map(void)
229{
230	int instance, mid;
231
232	instance = 0;
233	while (!cpu_find_by_instance(instance, NULL, &mid)) {
234		if (mid < NR_CPUS) {
235			set_cpu_possible(mid, true);
236			set_cpu_present(mid, true);
237		}
238		instance++;
239	}
240}
241
242void __init smp_prepare_boot_cpu(void)
243{
244	int cpuid = hard_smp_processor_id();
245
246	if (cpuid >= NR_CPUS) {
247		prom_printf("Serious problem, boot cpu id >= NR_CPUS\n");
248		prom_halt();
249	}
250	if (cpuid != 0)
251		printk("boot cpu id != 0, this could work but is untested\n");
252
253	current_thread_info()->cpu = cpuid;
254	set_cpu_online(cpuid, true);
255	set_cpu_possible(cpuid, true);
256}
257
258int __cpu_up(unsigned int cpu, struct task_struct *tidle)
259{
 
 
260	int ret=0;
261
262	switch(sparc_cpu_model) {
263	case sun4m:
264		ret = smp4m_boot_one_cpu(cpu, tidle);
265		break;
266	case sun4d:
267		ret = smp4d_boot_one_cpu(cpu, tidle);
268		break;
269	case sparc_leon:
270		ret = leon_boot_one_cpu(cpu, tidle);
271		break;
272	case sun4e:
273		printk("SUN4E\n");
274		BUG();
275		break;
276	case sun4u:
277		printk("SUN4U\n");
278		BUG();
279		break;
280	default:
281		printk("UNKNOWN!\n");
282		BUG();
283		break;
284	}
285
286	if (!ret) {
287		cpumask_set_cpu(cpu, &smp_commenced_mask);
288		while (!cpu_online(cpu))
289			mb();
290	}
291	return ret;
292}
293
294static void arch_cpu_pre_starting(void *arg)
295{
296	local_ops->cache_all();
297	local_ops->tlb_all();
298
299	switch(sparc_cpu_model) {
300	case sun4m:
301		sun4m_cpu_pre_starting(arg);
302		break;
303	case sun4d:
304		sun4d_cpu_pre_starting(arg);
305		break;
306	case sparc_leon:
307		leon_cpu_pre_starting(arg);
308		break;
309	default:
310		BUG();
311	}
312}
313
314static void arch_cpu_pre_online(void *arg)
315{
316	unsigned int cpuid = hard_smp_processor_id();
317
318	register_percpu_ce(cpuid);
319
320	calibrate_delay();
321	smp_store_cpu_info(cpuid);
322
323	local_ops->cache_all();
324	local_ops->tlb_all();
325
326	switch(sparc_cpu_model) {
327	case sun4m:
328		sun4m_cpu_pre_online(arg);
329		break;
330	case sun4d:
331		sun4d_cpu_pre_online(arg);
332		break;
333	case sparc_leon:
334		leon_cpu_pre_online(arg);
335		break;
336	default:
337		BUG();
338	}
339}
340
341static void sparc_start_secondary(void *arg)
342{
343	unsigned int cpu;
344
345	/*
346	 * SMP booting is extremely fragile in some architectures. So run
347	 * the cpu initialization code first before anything else.
348	 */
349	arch_cpu_pre_starting(arg);
350
351	preempt_disable();
352	cpu = smp_processor_id();
353
354	notify_cpu_starting(cpu);
355	arch_cpu_pre_online(arg);
356
357	/* Set the CPU in the cpu_online_mask */
358	set_cpu_online(cpu, true);
359
360	/* Enable local interrupts now */
361	local_irq_enable();
362
363	wmb();
364	cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
365
366	/* We should never reach here! */
367	BUG();
368}
369
370void smp_callin(void)
371{
372	sparc_start_secondary(NULL);
373}
374
375void smp_bogo(struct seq_file *m)
376{
377	int i;
378	
379	for_each_online_cpu(i) {
380		seq_printf(m,
381			   "Cpu%dBogo\t: %lu.%02lu\n",
382			   i,
383			   cpu_data(i).udelay_val/(500000/HZ),
384			   (cpu_data(i).udelay_val/(5000/HZ))%100);
385	}
386}
387
388void smp_info(struct seq_file *m)
389{
390	int i;
391
392	seq_printf(m, "State:\n");
393	for_each_online_cpu(i)
394		seq_printf(m, "CPU%d\t\t: online\n", i);
395}