summaryrefslogtreecommitdiffstats
path: root/arch/riscv/kernel/smp.c
blob: ea028d9e0d2424e8f58148db4bdb6700acfa7bef (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * SMP initialisation and IPI support
 * Based on arch/arm64/kernel/smp.c
 *
 * Copyright (C) 2012 ARM Ltd.
 * Copyright (C) 2015 Regents of the University of California
 * Copyright (C) 2017 SiFive
 */

#include <linux/cpu.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/profile.h>
#include <linux/smp.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/delay.h>
#include <linux/irq_work.h>

#include <asm/sbi.h>
#include <asm/tlbflush.h>
#include <asm/cacheflush.h>

enum ipi_message_type {
	IPI_RESCHEDULE,
	IPI_CALL_FUNC,
	IPI_CPU_STOP,
	IPI_IRQ_WORK,
	IPI_MAX
};

unsigned long __cpuid_to_hartid_map[NR_CPUS] = {
	[0 ... NR_CPUS-1] = INVALID_HARTID
};

void __init smp_setup_processor_id(void)
{
	cpuid_to_hartid_map(0) = boot_cpu_hartid;
}

/* A collection of single bit ipi messages.  */
static struct {
	unsigned long stats[IPI_MAX] ____cacheline_aligned;
	unsigned long bits ____cacheline_aligned;
} ipi_data[NR_CPUS] __cacheline_aligned;

int riscv_hartid_to_cpuid(int hartid)
{
	int i;

	for (i = 0; i < NR_CPUS; i++)
		if (cpuid_to_hartid_map(i) == hartid)
			return i;

	pr_err("Couldn't find cpu id for hartid [%d]\n", hartid);
	return i;
}

void riscv_cpuid_to_hartid_mask(const struct cpumask *in, struct cpumask *out)
{
	int cpu;

	cpumask_clear(out);
	for_each_cpu(cpu, in)
		cpumask_set_cpu(cpuid_to_hartid_map(cpu), out);
}
EXPORT_SYMBOL_GPL(riscv_cpuid_to_hartid_mask);

bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
{
	return phys_id == cpuid_to_hartid_map(cpu);
}

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

static void ipi_stop(void)
{
	set_cpu_online(smp_processor_id(), false);
	while (1)
		wait_for_interrupt();
}

static struct riscv_ipi_ops *ipi_ops;

void riscv_set_ipi_ops(struct riscv_ipi_ops *ops)
{
	ipi_ops = ops;
}
EXPORT_SYMBOL_GPL(riscv_set_ipi_ops);

void riscv_clear_ipi(void)
{
	if (ipi_ops && ipi_ops->ipi_clear)
		ipi_ops->ipi_clear();

	csr_clear(CSR_IP, IE_SIE);
}
EXPORT_SYMBOL_GPL(riscv_clear_ipi);

static void send_ipi_mask(const struct cpumask *mask, enum ipi_message_type op)
{
	int cpu;

	smp_mb__before_atomic();
	for_each_cpu(cpu, mask)
		set_bit(op, &ipi_data[cpu].bits);
	smp_mb__after_atomic();

	if (ipi_ops && ipi_ops->ipi_inject)
		ipi_ops->ipi_inject(mask);
	else
		pr_warn("SMP: IPI inject method not available\n");
}

static void send_ipi_single(int cpu, enum ipi_message_type op)
{
	smp_mb__before_atomic();
	set_bit(op, &ipi_data[cpu].bits);
	smp_mb__after_atomic();

	if (ipi_ops && ipi_ops->ipi_inject)
		ipi_ops->ipi_inject(cpumask_of(cpu));
	else
		pr_warn("SMP: IPI inject method not available\n");
}

#ifdef CONFIG_IRQ_WORK
void arch_irq_work_raise(void)
{
	send_ipi_single(smp_processor_id(), IPI_IRQ_WORK);
}
#endif

void handle_IPI(struct pt_regs *regs)
{
	struct pt_regs *old_regs = set_irq_regs(regs);
	unsigned long *pending_ipis = &ipi_data[smp_processor_id()].bits;
	unsigned long *stats = ipi_data[smp_processor_id()].stats;

	irq_enter();

	riscv_clear_ipi();

	while (true) {
		unsigned long ops;

		/* Order bit clearing and data access. */
		mb();

		ops = xchg(pending_ipis, 0);
		if (ops == 0)
			goto done;

		if (ops & (1 << IPI_RESCHEDULE)) {
			stats[IPI_RESCHEDULE]++;
			scheduler_ipi();
		}

		if (ops & (1 << IPI_CALL_FUNC)) {
			stats[IPI_CALL_FUNC]++;
			generic_smp_call_function_interrupt();
		}

		if (ops & (1 << IPI_CPU_STOP)) {
			stats[IPI_CPU_STOP]++;
			ipi_stop();
		}

		if (ops & (1 << IPI_IRQ_WORK)) {
			stats[IPI_IRQ_WORK]++;
			irq_work_run();
		}

		BUG_ON((ops >> IPI_MAX) != 0);

		/* Order data access and bit testing. */
		mb();
	}

done:
	irq_exit();
	set_irq_regs(old_regs);
}

static const char * const ipi_names[] = {
	[IPI_RESCHEDULE]	= "Rescheduling interrupts",
	[IPI_CALL_FUNC]		= "Function call interrupts",
	[IPI_CPU_STOP]		= "CPU stop interrupts",
	[IPI_IRQ_WORK]		= "IRQ work interrupts",
};

void show_ipi_stats(struct seq_file *p, int prec)
{
	unsigned int cpu, i;

	for (i = 0; i < IPI_MAX; i++) {
		seq_printf(p, "%*s%u:%s", prec - 1, "IPI", i,
			   prec >= 4 ? " " : "");
		for_each_online_cpu(cpu)
			seq_printf(p, "%10lu ", ipi_data[cpu].stats[i]);
		seq_printf(p, " %s\n", ipi_names[i]);
	}
}

void arch_send_call_function_ipi_mask(struct cpumask *mask)
{
	send_ipi_mask(mask, IPI_CALL_FUNC);
}

void arch_send_call_function_single_ipi(int cpu)
{
	send_ipi_single(cpu, IPI_CALL_FUNC);
}

void smp_send_stop(void)
{
	unsigned long timeout;

	if (num_online_cpus() > 1) {
		cpumask_t mask;

		cpumask_copy(&mask, cpu_online_mask);
		cpumask_clear_cpu(smp_processor_id(), &mask);

		if (system_state <= SYSTEM_RUNNING)
			pr_crit("SMP: stopping secondary CPUs\n");
		send_ipi_mask(&mask, IPI_CPU_STOP);
	}

	/* Wait up to one second for other CPUs to stop */
	timeout = USEC_PER_SEC;
	while (num_online_cpus() > 1 && timeout--)
		udelay(1);

	if (num_online_cpus() > 1)
		pr_warn("SMP: failed to stop secondary CPUs %*pbl\n",
			   cpumask_pr_args(cpu_online_mask));
}

void smp_send_reschedule(int cpu)
{
	send_ipi_single(cpu, IPI_RESCHEDULE);
}
EXPORT_SYMBOL_GPL(smp_send_reschedule);