summaryrefslogtreecommitdiffstats
path: root/arch/sparc/kernel/smp_32.c
blob: 76ce290c67cfd2f17df8b1bcb05b984c3bdceff6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
// SPDX-License-Identifier: GPL-2.0
/* smp.c: Sparc SMP support.
 *
 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 2004 Keith M Wesolowski (wesolows@foobazco.org)
 */

#include <asm/head.h>

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/threads.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/cache.h>
#include <linux/delay.h>
#include <linux/profile.h>
#include <linux/cpu.h>

#include <asm/ptrace.h>
#include <linux/atomic.h>

#include <asm/irq.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/oplib.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <asm/cpudata.h>
#include <asm/timer.h>
#include <asm/leon.h>

#include "kernel.h"
#include "irq.h"

volatile unsigned long cpu_callin_map[NR_CPUS] = {0,};

cpumask_t smp_commenced_mask = CPU_MASK_NONE;

const struct sparc32_ipi_ops *sparc32_ipi_ops;

/* The only guaranteed locking primitive available on all Sparc
 * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically
 * places the current byte at the effective address into dest_reg and
 * places 0xff there afterwards.  Pretty lame locking primitive
 * compared to the Alpha and the Intel no?  Most Sparcs have 'swap'
 * instruction which is much better...
 */

void smp_store_cpu_info(int id)
{
	int cpu_node;
	int mid;

	cpu_data(id).udelay_val = loops_per_jiffy;

	cpu_find_by_mid(id, &cpu_node);
	cpu_data(id).clock_tick = prom_getintdefault(cpu_node,
						     "clock-frequency", 0);
	cpu_data(id).prom_node = cpu_node;
	mid = cpu_get_hwmid(cpu_node);

	if (mid < 0) {
		printk(KERN_NOTICE "No MID found for CPU%d at node 0x%08x", id, cpu_node);
		mid = 0;
	}
	cpu_data(id).mid = mid;
}

void __init smp_cpus_done(unsigned int max_cpus)
{
	unsigned long bogosum = 0;
	int cpu, num = 0;

	for_each_online_cpu(cpu) {
		num++;
		bogosum += cpu_data(cpu).udelay_val;
	}

	printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
		num, bogosum/(500000/HZ),
		(bogosum/(5000/HZ))%100);

	switch(sparc_cpu_model) {
	case sun4m:
		smp4m_smp_done();
		break;
	case sun4d:
		smp4d_smp_done();
		break;
	case sparc_leon:
		leon_smp_done();
		break;
	case sun4e:
		printk("SUN4E\n");
		BUG();
		break;
	case sun4u:
		printk("SUN4U\n");
		BUG();
		break;
	default:
		printk("UNKNOWN!\n");
		BUG();
		break;
	}
}

void cpu_panic(void)
{
	printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
	panic("SMP bolixed\n");
}

struct linux_prom_registers smp_penguin_ctable = { 0 };

void smp_send_reschedule(int cpu)
{
	/*
	 * CPU model dependent way of implementing IPI generation targeting
	 * a single CPU. The trap handler needs only to do trap entry/return
	 * to call schedule.
	 */
	sparc32_ipi_ops->resched(cpu);
}

void smp_send_stop(void)
{
}

void arch_send_call_function_single_ipi(int cpu)
{
	/* trigger one IPI single call on one CPU */
	sparc32_ipi_ops->single(cpu);
}

void arch_send_call_function_ipi_mask(const struct cpumask *mask)
{
	int cpu;

	/* trigger IPI mask call on each CPU */
	for_each_cpu(cpu, mask)
		sparc32_ipi_ops->mask_one(cpu);
}

void smp_resched_interrupt(void)
{
	irq_enter();
	scheduler_ipi();
	local_cpu_data().irq_resched_count++;
	irq_exit();
	/* re-schedule routine called by interrupt return code. */
}

void smp_call_function_single_interrupt(void)
{
	irq_enter();
	generic_smp_call_function_single_interrupt();
	local_cpu_data().irq_call_count++;
	irq_exit();
}

void smp_call_function_interrupt(void)
{
	irq_enter();
	generic_smp_call_function_interrupt();
	local_cpu_data().irq_call_count++;
	irq_exit();
}

int setup_profiling_timer(unsigned int multiplier)
{
	return -EINVAL;
}

void __init smp_prepare_cpus(unsigned int max_cpus)
{
	int i, cpuid, extra;

	printk("Entering SMP Mode...\n");

	extra = 0;
	for (i = 0; !cpu_find_by_instance(i, NULL, &cpuid); i++) {
		if (cpuid >= NR_CPUS)
			extra++;
	}
	/* i = number of cpus */
	if (extra && max_cpus > i - extra)
		printk("Warning: NR_CPUS is too low to start all cpus\n");

	smp_store_cpu_info(boot_cpu_id);

	switch(sparc_cpu_model) {
	case sun4m:
		smp4m_boot_cpus();
		break;
	case sun4d:
		smp4d_boot_cpus();
		break;
	case sparc_leon:
		leon_boot_cpus();
		break;
	case sun4e:
		printk("SUN4E\n");
		BUG();
		break;
	case sun4u:
		printk("SUN4U\n");
		BUG();
		break;
	default:
		printk("UNKNOWN!\n");
		BUG();
		break;
	}
}

/* Set this up early so that things like the scheduler can init
 * properly.  We use the same cpu mask for both the present and
 * possible cpu map.
 */
void __init smp_setup_cpu_possible_map(void)
{
	int instance, mid;

	instance = 0;
	while (!cpu_find_by_instance(instance, NULL, &mid)) {
		if (mid < NR_CPUS) {
			set_cpu_possible(mid, true);
			set_cpu_present(mid, true);
		}
		instance++;
	}
}

void __init smp_prepare_boot_cpu(void)
{
	int cpuid = hard_smp_processor_id();

	if (cpuid >= NR_CPUS) {
		prom_printf("Serious problem, boot cpu id >= NR_CPUS\n");
		prom_halt();
	}
	if (cpuid != 0)
		printk("boot cpu id != 0, this could work but is untested\n");

	current_thread_info()->cpu = cpuid;
	set_cpu_online(cpuid, true);
	set_cpu_possible(cpuid, true);
}

int __cpu_up(unsigned int cpu, struct task_struct *tidle)
{
	int ret=0;

	switch(sparc_cpu_model) {
	case sun4m:
		ret = smp4m_boot_one_cpu(cpu, tidle);
		break;
	case sun4d:
		ret = smp4d_boot_one_cpu(cpu, tidle);
		break;
	case sparc_leon:
		ret = leon_boot_one_cpu(cpu, tidle);
		break;
	case sun4e:
		printk("SUN4E\n");
		BUG();
		break;
	case sun4u:
		printk("SUN4U\n");
		BUG();
		break;
	default:
		printk("UNKNOWN!\n");
		BUG();
		break;
	}

	if (!ret) {
		cpumask_set_cpu(cpu, &smp_commenced_mask);
		while (!cpu_online(cpu))
			mb();
	}
	return ret;
}

static void arch_cpu_pre_starting(void *arg)
{
	local_ops->cache_all();
	local_ops->tlb_all();

	switch(sparc_cpu_model) {
	case sun4m:
		sun4m_cpu_pre_starting(arg);
		break;
	case sun4d:
		sun4d_cpu_pre_starting(arg);
		break;
	case sparc_leon:
		leon_cpu_pre_starting(arg);
		break;
	default:
		BUG();
	}
}

static void arch_cpu_pre_online(void *arg)
{
	unsigned int cpuid = hard_smp_processor_id();

	register_percpu_ce(cpuid);

	calibrate_delay();
	smp_store_cpu_info(cpuid);

	local_ops->cache_all();
	local_ops->tlb_all();

	switch(sparc_cpu_model) {
	case sun4m:
		sun4m_cpu_pre_online(arg);
		break;
	case sun4d:
		sun4d_cpu_pre_online(arg);
		break;
	case sparc_leon:
		leon_cpu_pre_online(arg);
		break;
	default:
		BUG();
	}
}

static void sparc_start_secondary(void *arg)
{
	unsigned int cpu;

	/*
	 * SMP booting is extremely fragile in some architectures. So run
	 * the cpu initialization code first before anything else.
	 */
	arch_cpu_pre_starting(arg);

	preempt_disable();
	cpu = smp_processor_id();

	notify_cpu_starting(cpu);
	arch_cpu_pre_online(arg);

	/* Set the CPU in the cpu_online_mask */
	set_cpu_online(cpu, true);

	/* Enable local interrupts now */
	local_irq_enable();

	wmb();
	cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);

	/* We should never reach here! */
	BUG();
}

void smp_callin(void)
{
	sparc_start_secondary(NULL);
}

void smp_bogo(struct seq_file *m)
{
	int i;
	
	for_each_online_cpu(i) {
		seq_printf(m,
			   "Cpu%dBogo\t: %lu.%02lu\n",
			   i,
			   cpu_data(i).udelay_val/(500000/HZ),
			   (cpu_data(i).udelay_val/(5000/HZ))%100);
	}
}

void smp_info(struct seq_file *m)
{
	int i;

	seq_printf(m, "State:\n");
	for_each_online_cpu(i)
		seq_printf(m, "CPU%d\t\t: online\n", i);
}