aboutsummaryrefslogtreecommitdiffstats
path: root/lib/nmi_backtrace.c
blob: 88d3d32e59236bc1127d88c781bc014d70920652 (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
/*
 *  NMI backtrace support
 *
 * Gratuitously copied from arch/x86/kernel/apic/hw_nmi.c by Russell King,
 * with the following header:
 *
 *  HW NMI watchdog support
 *
 *  started by Don Zickus, Copyright (C) 2010 Red Hat, Inc.
 *
 *  Arch specific calls to support NMI watchdog
 *
 *  Bits copied from original nmi.c file
 */
#include <linux/cpumask.h>
#include <linux/delay.h>
#include <linux/kprobes.h>
#include <linux/nmi.h>
#include <linux/seq_buf.h>

#ifdef arch_trigger_all_cpu_backtrace
/* For reliability, we're prepared to waste bits here. */
static DECLARE_BITMAP(backtrace_mask, NR_CPUS) __read_mostly;
static cpumask_t printtrace_mask;

#define NMI_BUF_SIZE		4096

struct nmi_seq_buf {
	unsigned char		buffer[NMI_BUF_SIZE];
	struct seq_buf		seq;
};

/* Safe printing in NMI context */
static DEFINE_PER_CPU(struct nmi_seq_buf, nmi_print_seq);

/* "in progress" flag of arch_trigger_all_cpu_backtrace */
static unsigned long backtrace_flag;

static void print_seq_line(struct nmi_seq_buf *s, int start, int end)
{
	const char *buf = s->buffer + start;

	printk("%.*s", (end - start) + 1, buf);
}

void nmi_trigger_all_cpu_backtrace(bool include_self,
				   void (*raise)(cpumask_t *mask))
{
	struct nmi_seq_buf *s;
	int i, cpu, this_cpu = get_cpu();

	if (test_and_set_bit(0, &backtrace_flag)) {
		/*
		 * If there is already a trigger_all_cpu_backtrace() in progress
		 * (backtrace_flag == 1), don't output double cpu dump infos.
		 */
		put_cpu();
		return;
	}

	cpumask_copy(to_cpumask(backtrace_mask), cpu_online_mask);
	if (!include_self)
		cpumask_clear_cpu(this_cpu, to_cpumask(backtrace_mask));

	cpumask_copy(&printtrace_mask, to_cpumask(backtrace_mask));

	/*
	 * Set up per_cpu seq_buf buffers that the NMIs running on the other
	 * CPUs will write to.
	 */
	for_each_cpu(cpu, to_cpumask(backtrace_mask)) {
		s = &per_cpu(nmi_print_seq, cpu);
		seq_buf_init(&s->seq, s->buffer, NMI_BUF_SIZE);
	}

	if (!cpumask_empty(to_cpumask(backtrace_mask))) {
		pr_info("Sending NMI to %s CPUs:\n",
			(include_self ? "all" : "other"));
		raise(to_cpumask(backtrace_mask));
	}

	/* Wait for up to 10 seconds for all CPUs to do the backtrace */
	for (i = 0; i < 10 * 1000; i++) {
		if (cpumask_empty(to_cpumask(backtrace_mask)))
			break;
		mdelay(1);
		touch_softlockup_watchdog();
	}

	/*
	 * Now that all the NMIs have triggered, we can dump out their
	 * back traces safely to the console.
	 */
	for_each_cpu(cpu, &printtrace_mask) {
		int len, last_i = 0;

		s = &per_cpu(nmi_print_seq, cpu);
		len = seq_buf_used(&s->seq);
		if (!len)
			continue;

		/* Print line by line. */
		for (i = 0; i < len; i++) {
			if (s->buffer[i] == '\n') {
				print_seq_line(s, last_i, i);
				last_i = i + 1;
			}
		}
		/* Check if there was a partial line. */
		if (last_i < len) {
			print_seq_line(s, last_i, len - 1);
			pr_cont("\n");
		}
	}

	clear_bit(0, &backtrace_flag);
	smp_mb__after_atomic();
	put_cpu();
}

/*
 * It is not safe to call printk() directly from NMI handlers.
 * It may be fine if the NMI detected a lock up and we have no choice
 * but to do so, but doing a NMI on all other CPUs to get a back trace
 * can be done with a sysrq-l. We don't want that to lock up, which
 * can happen if the NMI interrupts a printk in progress.
 *
 * Instead, we redirect the vprintk() to this nmi_vprintk() that writes
 * the content into a per cpu seq_buf buffer. Then when the NMIs are
 * all done, we can safely dump the contents of the seq_buf to a printk()
 * from a non NMI context.
 */
static int nmi_vprintk(const char *fmt, va_list args)
{
	struct nmi_seq_buf *s = this_cpu_ptr(&nmi_print_seq);
	unsigned int len = seq_buf_used(&s->seq);

	seq_buf_vprintf(&s->seq, fmt, args);
	return seq_buf_used(&s->seq) - len;
}

bool nmi_cpu_backtrace(struct pt_regs *regs)
{
	int cpu = smp_processor_id();

	if (cpumask_test_cpu(cpu, to_cpumask(backtrace_mask))) {
		printk_func_t printk_func_save = this_cpu_read(printk_func);

		/* Replace printk to write into the NMI seq */
		this_cpu_write(printk_func, nmi_vprintk);
		pr_warn("NMI backtrace for cpu %d\n", cpu);
		show_regs(regs);
		this_cpu_write(printk_func, printk_func_save);

		cpumask_clear_cpu(cpu, to_cpumask(backtrace_mask));
		return true;
	}

	return false;
}
NOKPROBE_SYMBOL(nmi_cpu_backtrace);
#endif

Privacy Policy