339cffa34e7094e231b966cdfd298bee9b0d436d
[openwrt/openwrt.git] / target / linux / generic / patches-4.4 / 930-crashlog.patch
1 --- /dev/null
2 +++ b/include/linux/crashlog.h
3 @@ -0,0 +1,17 @@
4 +#ifndef __CRASHLOG_H
5 +#define __CRASHLOG_H
6 +
7 +#ifdef CONFIG_CRASHLOG
8 +void crashlog_init_bootmem(struct bootmem_data *bdata);
9 +void crashlog_init_memblock(phys_addr_t addr, phys_addr_t size);
10 +#else
11 +static inline void crashlog_init_bootmem(struct bootmem_data *bdata)
12 +{
13 +}
14 +
15 +static inline void crashlog_init_memblock(phys_addr_t addr, phys_addr_t size)
16 +{
17 +}
18 +#endif
19 +
20 +#endif
21 --- a/init/Kconfig
22 +++ b/init/Kconfig
23 @@ -1296,6 +1296,10 @@ config RELAY
24
25 If unsure, say N.
26
27 +config CRASHLOG
28 + bool "Crash logging"
29 + depends on (!NO_BOOTMEM || HAVE_MEMBLOCK)
30 +
31 config BLK_DEV_INITRD
32 bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
33 depends on BROKEN || !FRV
34 --- a/kernel/Makefile
35 +++ b/kernel/Makefile
36 @@ -103,6 +103,7 @@ obj-$(CONFIG_TORTURE_TEST) += torture.o
37 obj-$(CONFIG_MEMBARRIER) += membarrier.o
38
39 obj-$(CONFIG_HAS_IOMEM) += memremap.o
40 +obj-$(CONFIG_CRASHLOG) += crashlog.o
41
42 $(obj)/configs.o: $(obj)/config_data.h
43
44 --- /dev/null
45 +++ b/kernel/crashlog.c
46 @@ -0,0 +1,193 @@
47 +/*
48 + * Crash information logger
49 + * Copyright (C) 2010 Felix Fietkau <nbd@nbd.name>
50 + *
51 + * Based on ramoops.c
52 + * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
53 + *
54 + * This program is free software; you can redistribute it and/or
55 + * modify it under the terms of the GNU General Public License
56 + * version 2 as published by the Free Software Foundation.
57 + *
58 + * This program is distributed in the hope that it will be useful, but
59 + * WITHOUT ANY WARRANTY; without even the implied warranty of
60 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
61 + * General Public License for more details.
62 + *
63 + * You should have received a copy of the GNU General Public License
64 + * along with this program; if not, write to the Free Software
65 + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
66 + * 02110-1301 USA
67 + *
68 + */
69 +
70 +#include <linux/module.h>
71 +#include <linux/bootmem.h>
72 +#include <linux/memblock.h>
73 +#include <linux/debugfs.h>
74 +#include <linux/crashlog.h>
75 +#include <linux/kmsg_dump.h>
76 +#include <linux/module.h>
77 +#include <linux/pfn.h>
78 +#include <linux/vmalloc.h>
79 +#include <asm/io.h>
80 +
81 +#define CRASHLOG_PAGES 4
82 +#define CRASHLOG_SIZE (CRASHLOG_PAGES * PAGE_SIZE)
83 +#define CRASHLOG_MAGIC 0xa1eedead
84 +
85 +/*
86 + * Start the log at 1M before the end of RAM, as some boot loaders like
87 + * to use the end of the RAM for stack usage and other things
88 + * If this fails, fall back to using the last part.
89 + */
90 +#define CRASHLOG_OFFSET (1024 * 1024)
91 +
92 +struct crashlog_data {
93 + u32 magic;
94 + u32 len;
95 + u8 data[];
96 +};
97 +
98 +static struct debugfs_blob_wrapper crashlog_blob;
99 +static unsigned long crashlog_addr = 0;
100 +static struct crashlog_data *crashlog_buf;
101 +static struct kmsg_dumper dump;
102 +static bool first = true;
103 +
104 +extern struct list_head *crashlog_modules;
105 +
106 +#ifndef CONFIG_NO_BOOTMEM
107 +void __init crashlog_init_bootmem(bootmem_data_t *bdata)
108 +{
109 + unsigned long addr;
110 +
111 + if (crashlog_addr)
112 + return;
113 +
114 + addr = PFN_PHYS(bdata->node_low_pfn) - CRASHLOG_OFFSET;
115 + if (reserve_bootmem(addr, CRASHLOG_SIZE, BOOTMEM_EXCLUSIVE) < 0) {
116 + printk("Crashlog failed to allocate RAM at address 0x%lx\n", addr);
117 + bdata->node_low_pfn -= CRASHLOG_PAGES;
118 + addr = PFN_PHYS(bdata->node_low_pfn);
119 + }
120 + crashlog_addr = addr;
121 +}
122 +#endif
123 +
124 +#ifdef CONFIG_HAVE_MEMBLOCK
125 +void __init_memblock crashlog_init_memblock(phys_addr_t addr, phys_addr_t size)
126 +{
127 + if (crashlog_addr)
128 + return;
129 +
130 + addr += size - CRASHLOG_OFFSET;
131 + if (memblock_reserve(addr, CRASHLOG_SIZE)) {
132 + printk("Crashlog failed to allocate RAM at address 0x%lx\n", (unsigned long) addr);
133 + return;
134 + }
135 +
136 + crashlog_addr = addr;
137 +}
138 +#endif
139 +
140 +static void __init crashlog_copy(void)
141 +{
142 + if (crashlog_buf->magic != CRASHLOG_MAGIC)
143 + return;
144 +
145 + if (!crashlog_buf->len || crashlog_buf->len >
146 + CRASHLOG_SIZE - sizeof(*crashlog_buf))
147 + return;
148 +
149 + crashlog_blob.size = crashlog_buf->len;
150 + crashlog_blob.data = kmemdup(crashlog_buf->data,
151 + crashlog_buf->len, GFP_KERNEL);
152 +
153 + debugfs_create_blob("crashlog", 0700, NULL, &crashlog_blob);
154 +}
155 +
156 +static int get_maxlen(void)
157 +{
158 + return CRASHLOG_SIZE - sizeof(*crashlog_buf) - crashlog_buf->len;
159 +}
160 +
161 +static void crashlog_printf(const char *fmt, ...)
162 +{
163 + va_list args;
164 + int len = get_maxlen();
165 +
166 + if (!len)
167 + return;
168 +
169 + va_start(args, fmt);
170 + crashlog_buf->len += vscnprintf(
171 + &crashlog_buf->data[crashlog_buf->len],
172 + len, fmt, args);
173 + va_end(args);
174 +}
175 +
176 +static void crashlog_do_dump(struct kmsg_dumper *dumper,
177 + enum kmsg_dump_reason reason)
178 +{
179 + struct timeval tv;
180 + struct module *m;
181 + char *buf;
182 + size_t len;
183 +
184 + if (!first)
185 + crashlog_printf("\n===================================\n");
186 +
187 + do_gettimeofday(&tv);
188 + crashlog_printf("Time: %lu.%lu\n",
189 + (long)tv.tv_sec, (long)tv.tv_usec);
190 +
191 + if (first) {
192 + crashlog_printf("Modules:");
193 + list_for_each_entry(m, crashlog_modules, list) {
194 + crashlog_printf("\t%s@%p+%x", m->name,
195 + m->module_core, m->core_size,
196 + m->module_init, m->init_size);
197 + }
198 + crashlog_printf("\n");
199 + first = false;
200 + }
201 +
202 + buf = (char *)&crashlog_buf->data[crashlog_buf->len];
203 +
204 + kmsg_dump_get_buffer(dumper, true, buf, get_maxlen(), &len);
205 +
206 + crashlog_buf->len += len;
207 +}
208 +
209 +
210 +int __init crashlog_init_fs(void)
211 +{
212 + struct page *pages[CRASHLOG_PAGES];
213 + pgprot_t prot;
214 + int i;
215 +
216 + if (!crashlog_addr) {
217 + printk("No memory allocated for crashlog\n");
218 + return -ENOMEM;
219 + }
220 +
221 + printk("Crashlog allocated RAM at address 0x%lx\n", (unsigned long) crashlog_addr);
222 + for (i = 0; i < CRASHLOG_PAGES; i++)
223 + pages[i] = pfn_to_page((crashlog_addr >> PAGE_SHIFT) + i);
224 +
225 + prot = pgprot_writecombine(PAGE_KERNEL);
226 + crashlog_buf = vmap(pages, CRASHLOG_PAGES, VM_MAP, prot);
227 +
228 + crashlog_copy();
229 +
230 + crashlog_buf->magic = CRASHLOG_MAGIC;
231 + crashlog_buf->len = 0;
232 +
233 + dump.max_reason = KMSG_DUMP_OOPS;
234 + dump.dump = crashlog_do_dump;
235 + kmsg_dump_register(&dump);
236 +
237 + return 0;
238 +}
239 +module_init(crashlog_init_fs);
240 --- a/mm/bootmem.c
241 +++ b/mm/bootmem.c
242 @@ -15,6 +15,7 @@
243 #include <linux/export.h>
244 #include <linux/kmemleak.h>
245 #include <linux/range.h>
246 +#include <linux/crashlog.h>
247 #include <linux/memblock.h>
248 #include <linux/bug.h>
249 #include <linux/io.h>
250 @@ -177,6 +178,7 @@ static unsigned long __init free_all_boo
251 if (!bdata->node_bootmem_map)
252 return 0;
253
254 + crashlog_init_bootmem(bdata);
255 map = bdata->node_bootmem_map;
256 start = bdata->node_min_pfn;
257 end = bdata->node_low_pfn;
258 --- a/kernel/module.c
259 +++ b/kernel/module.c
260 @@ -275,6 +275,9 @@ static void mod_update_bounds(struct mod
261 #ifdef CONFIG_KGDB_KDB
262 struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
263 #endif /* CONFIG_KGDB_KDB */
264 +#ifdef CONFIG_CRASHLOG
265 +struct list_head *crashlog_modules = &modules;
266 +#endif
267
268 static void module_assert_mutex(void)
269 {
270 --- a/mm/memblock.c
271 +++ b/mm/memblock.c
272 @@ -19,6 +19,7 @@
273 #include <linux/debugfs.h>
274 #include <linux/seq_file.h>
275 #include <linux/memblock.h>
276 +#include <linux/crashlog.h>
277
278 #include <asm-generic/sections.h>
279 #include <linux/io.h>
280 @@ -541,6 +542,8 @@ int __init_memblock memblock_add_range(s
281 type->regions[0].flags = flags;
282 memblock_set_region_node(&type->regions[0], nid);
283 type->total_size = size;
284 + if (type == &memblock.memory)
285 + crashlog_init_memblock(base, size);
286 return 0;
287 }
288 repeat: