summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kernel/crash.c
blob: 5f248e3fdf821abfc71a3041a3569762c2d4807d (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
/*
 * Architecture specific (PPC64) functions for kexec based crash dumps.
 *
 * Copyright (C) 2005, IBM Corp.
 *
 * Created by: Haren Myneni
 *
 * This source code is licensed under the GNU General Public License,
 * Version 2.  See the file COPYING for more details.
 *
 */

#undef DEBUG

#include <linux/kernel.h>
#include <linux/smp.h>
#include <linux/reboot.h>
#include <linux/kexec.h>
#include <linux/bootmem.h>
#include <linux/crash_dump.h>
#include <linux/delay.h>
#include <linux/elf.h>
#include <linux/elfcore.h>
#include <linux/init.h>
#include <linux/types.h>

#include <asm/processor.h>
#include <asm/machdep.h>
#include <asm/kdump.h>
#include <asm/lmb.h>
#include <asm/firmware.h>
#include <asm/smp.h>

#ifdef DEBUG
#include <asm/udbg.h>
#define DBG(fmt...) udbg_printf(fmt)
#else
#define DBG(fmt...)
#endif

/* This keeps a track of which one is crashing cpu. */
int crashing_cpu = -1;

static u32 *append_elf_note(u32 *buf, char *name, unsigned type, void *data,
							       size_t data_len)
{
	struct elf_note note;

	note.n_namesz = strlen(name) + 1;
	note.n_descsz = data_len;
	note.n_type   = type;
	memcpy(buf, &note, sizeof(note));
	buf += (sizeof(note) +3)/4;
	memcpy(buf, name, note.n_namesz);
	buf += (note.n_namesz + 3)/4;
	memcpy(buf, data, note.n_descsz);
	buf += (note.n_descsz + 3)/4;

	return buf;
}

static void final_note(u32 *buf)
{
	struct elf_note note;

	note.n_namesz = 0;
	note.n_descsz = 0;
	note.n_type   = 0;
	memcpy(buf, &note, sizeof(note));
}

static void crash_save_this_cpu(struct pt_regs *regs, int cpu)
{
	struct elf_prstatus prstatus;
	u32 *buf;

	if ((cpu < 0) || (cpu >= NR_CPUS))
		return;

	/* Using ELF notes here is opportunistic.
	 * I need a well defined structure format
	 * for the data I pass, and I need tags
	 * on the data to indicate what information I have
	 * squirrelled away.  ELF notes happen to provide
	 * all of that that no need to invent something new.
	 */
	buf = &crash_notes[cpu][0];
	memset(&prstatus, 0, sizeof(prstatus));
	prstatus.pr_pid = current->pid;
	elf_core_copy_regs(&prstatus.pr_reg, regs);
	buf = append_elf_note(buf, "CORE", NT_PRSTATUS, &prstatus,
			sizeof(prstatus));
	final_note(buf);
}

/* FIXME Merge this with xmon_save_regs ?? */
static inline void crash_get_current_regs(struct pt_regs *regs)
{
	unsigned long tmp1, tmp2;

	__asm__ __volatile__ (
		"std    0,0(%2)\n"
		"std    1,8(%2)\n"
		"std    2,16(%2)\n"
		"std    3,24(%2)\n"
		"std    4,32(%2)\n"
		"std    5,40(%2)\n"
		"std    6,48(%2)\n"
		"std    7,56(%2)\n"
		"std    8,64(%2)\n"
		"std    9,72(%2)\n"
		"std    10,80(%2)\n"
		"std    11,88(%2)\n"
		"std    12,96(%2)\n"
		"std    13,104(%2)\n"
		"std    14,112(%2)\n"
		"std    15,120(%2)\n"
		"std    16,128(%2)\n"
		"std    17,136(%2)\n"
		"std    18,144(%2)\n"
		"std    19,152(%2)\n"
		"std    20,160(%2)\n"
		"std    21,168(%2)\n"
		"std    22,176(%2)\n"
		"std    23,184(%2)\n"
		"std    24,192(%2)\n"
		"std    25,200(%2)\n"
		"std    26,208(%2)\n"
		"std    27,216(%2)\n"
		"std    28,224(%2)\n"
		"std    29,232(%2)\n"
		"std    30,240(%2)\n"
		"std    31,248(%2)\n"
		"mfmsr  %0\n"
		"std    %0, 264(%2)\n"
		"mfctr  %0\n"
		"std    %0, 280(%2)\n"
		"mflr   %0\n"
		"std    %0, 288(%2)\n"
		"bl     1f\n"
	"1:      mflr   %1\n"
		"std    %1, 256(%2)\n"
		"mtlr   %0\n"
		"mfxer  %0\n"
		"std    %0, 296(%2)\n"
		: "=&r" (tmp1), "=&r" (tmp2)
		: "b" (regs));
}

/* We may have saved_regs from where the error came from
 * or it is NULL if via a direct panic().
 */
static void crash_save_self(struct pt_regs *saved_regs)
{
	struct pt_regs regs;
	int cpu;

	cpu = smp_processor_id();
	if (saved_regs)
		memcpy(&regs, saved_regs, sizeof(regs));
	else
		crash_get_current_regs(&regs);
	crash_save_this_cpu(&regs, cpu);
}

#ifdef CONFIG_SMP
static atomic_t waiting_for_crash_ipi;

void crash_ipi_callback(struct pt_regs *regs)
{
	int cpu = smp_processor_id();

	if (cpu == crashing_cpu)
		return;

	if (!cpu_online(cpu))
		return;

	if (ppc_md.kexec_cpu_down)
		ppc_md.kexec_cpu_down(1, 1);

	local_irq_disable();

	crash_save_this_cpu(regs, cpu);
	atomic_dec(&waiting_for_crash_ipi);
	kexec_smp_wait();
	/* NOTREACHED */
}

static void crash_kexec_prepare_cpus(void)
{
	unsigned int msecs;

	atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);

	crash_send_ipi(crash_ipi_callback);
	smp_wmb();

	/*
	 * FIXME: Until we will have the way to stop other CPUSs reliabally,
	 * the crash CPU will send an IPI and wait for other CPUs to
	 * respond. If not, proceed the kexec boot even though we failed to
	 * capture other CPU states.
	 */
	msecs = 1000000;
	while ((atomic_read(&waiting_for_crash_ipi) > 0) && (--msecs > 0)) {
		barrier();
		mdelay(1);
	}

	/* Would it be better to replace the trap vector here? */

	/*
	 * FIXME: In case if we do not get all CPUs, one possibility: ask the
	 * user to do soft reset such that we get all.
	 * IPI handler is already set by the panic cpu initially. Therefore,
	 * all cpus could invoke this handler from die() and the panic CPU
	 * will call machine_kexec() directly from this handler to do
	 * kexec boot.
	 */
	if (atomic_read(&waiting_for_crash_ipi))
		printk(KERN_ALERT "done waiting: %d cpus not responding\n",
			atomic_read(&waiting_for_crash_ipi));
	/* Leave the IPI callback set */
}
#else
static void crash_kexec_prepare_cpus(void)
{
	/*
	 * move the secondarys to us so that we can copy
	 * the new kernel 0-0x100 safely
	 *
	 * do this if kexec in setup.c ?
	 */
	smp_release_cpus();
}

#endif

void default_machine_crash_shutdown(struct pt_regs *regs)
{
	/*
	 * This function is only called after the system
	 * has paniced or is otherwise in a critical state.
	 * The minimum amount of code to allow a kexec'd kernel
	 * to run successfully needs to happen here.
	 *
	 * In practice this means stopping other cpus in
	 * an SMP system.
	 * The kernel is broken so disable interrupts.
	 */
	local_irq_disable();

	if (ppc_md.kexec_cpu_down)
		ppc_md.kexec_cpu_down(1, 0);

	/*
	 * Make a note of crashing cpu. Will be used in machine_kexec
	 * such that another IPI will not be sent.
	 */
	crashing_cpu = smp_processor_id();
	crash_kexec_prepare_cpus();
	crash_save_self(regs);
}
OpenPOWER on IntegriCloud