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56d611a0 MS |
1 | /* |
2 | * RAM Oops/Panic logger | |
3 | * | |
4 | * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * version 2 as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
18 | * 02110-1301 USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <linux/kernel.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/kmsg_dump.h> | |
25 | #include <linux/time.h> | |
26 | #include <linux/io.h> | |
27 | #include <linux/ioport.h> | |
c3b92ce9 KP |
28 | #include <linux/platform_device.h> |
29 | #include <linux/ramoops.h> | |
56d611a0 MS |
30 | |
31 | #define RAMOOPS_KERNMSG_HDR "====" | |
56d611a0 | 32 | |
264b795f | 33 | #define RECORD_SIZE 4096UL |
56d611a0 MS |
34 | |
35 | static ulong mem_address; | |
36 | module_param(mem_address, ulong, 0400); | |
37 | MODULE_PARM_DESC(mem_address, | |
38 | "start of reserved RAM used to store oops/panic logs"); | |
39 | ||
40 | static ulong mem_size; | |
41 | module_param(mem_size, ulong, 0400); | |
42 | MODULE_PARM_DESC(mem_size, | |
43 | "size of reserved RAM used to store oops/panic logs"); | |
44 | ||
45 | static int dump_oops = 1; | |
46 | module_param(dump_oops, int, 0600); | |
47 | MODULE_PARM_DESC(dump_oops, | |
48 | "set to 1 to dump oopses, 0 to only dump panics (default 1)"); | |
49 | ||
50 | static struct ramoops_context { | |
51 | struct kmsg_dumper dump; | |
52 | void *virt_addr; | |
53 | phys_addr_t phys_addr; | |
54 | unsigned long size; | |
55 | int count; | |
56 | int max_count; | |
57 | } oops_cxt; | |
58 | ||
59 | static void ramoops_do_dump(struct kmsg_dumper *dumper, | |
60 | enum kmsg_dump_reason reason, const char *s1, unsigned long l1, | |
61 | const char *s2, unsigned long l2) | |
62 | { | |
63 | struct ramoops_context *cxt = container_of(dumper, | |
64 | struct ramoops_context, dump); | |
65 | unsigned long s1_start, s2_start; | |
66 | unsigned long l1_cpy, l2_cpy; | |
1873bb81 AD |
67 | int res, hdr_size; |
68 | char *buf, *buf_orig; | |
56d611a0 MS |
69 | struct timeval timestamp; |
70 | ||
fc2d557c SA |
71 | if (reason != KMSG_DUMP_OOPS && |
72 | reason != KMSG_DUMP_PANIC && | |
73 | reason != KMSG_DUMP_KEXEC) | |
74 | return; | |
75 | ||
56d611a0 MS |
76 | /* Only dump oopses if dump_oops is set */ |
77 | if (reason == KMSG_DUMP_OOPS && !dump_oops) | |
78 | return; | |
79 | ||
264b795f | 80 | buf = cxt->virt_addr + (cxt->count * RECORD_SIZE); |
1873bb81 AD |
81 | buf_orig = buf; |
82 | ||
56d611a0 MS |
83 | memset(buf, '\0', RECORD_SIZE); |
84 | res = sprintf(buf, "%s", RAMOOPS_KERNMSG_HDR); | |
85 | buf += res; | |
86 | do_gettimeofday(×tamp); | |
87 | res = sprintf(buf, "%lu.%lu\n", (long)timestamp.tv_sec, (long)timestamp.tv_usec); | |
88 | buf += res; | |
89 | ||
1873bb81 | 90 | hdr_size = buf - buf_orig; |
264b795f AM |
91 | l2_cpy = min(l2, RECORD_SIZE - hdr_size); |
92 | l1_cpy = min(l1, RECORD_SIZE - hdr_size - l2_cpy); | |
56d611a0 MS |
93 | |
94 | s2_start = l2 - l2_cpy; | |
95 | s1_start = l1 - l1_cpy; | |
96 | ||
97 | memcpy(buf, s1 + s1_start, l1_cpy); | |
98 | memcpy(buf + l1_cpy, s2 + s2_start, l2_cpy); | |
99 | ||
100 | cxt->count = (cxt->count + 1) % cxt->max_count; | |
101 | } | |
102 | ||
c3b92ce9 | 103 | static int __init ramoops_probe(struct platform_device *pdev) |
56d611a0 | 104 | { |
c3b92ce9 | 105 | struct ramoops_platform_data *pdata = pdev->dev.platform_data; |
56d611a0 MS |
106 | struct ramoops_context *cxt = &oops_cxt; |
107 | int err = -EINVAL; | |
108 | ||
c3b92ce9 KP |
109 | if (pdata) { |
110 | mem_size = pdata->mem_size; | |
111 | mem_address = pdata->mem_address; | |
112 | } | |
113 | ||
56d611a0 MS |
114 | if (!mem_size) { |
115 | printk(KERN_ERR "ramoops: invalid size specification"); | |
116 | goto fail3; | |
117 | } | |
118 | ||
119 | rounddown_pow_of_two(mem_size); | |
120 | ||
121 | if (mem_size < RECORD_SIZE) { | |
122 | printk(KERN_ERR "ramoops: size too small"); | |
123 | goto fail3; | |
124 | } | |
125 | ||
126 | cxt->max_count = mem_size / RECORD_SIZE; | |
127 | cxt->count = 0; | |
128 | cxt->size = mem_size; | |
129 | cxt->phys_addr = mem_address; | |
130 | ||
131 | if (!request_mem_region(cxt->phys_addr, cxt->size, "ramoops")) { | |
132 | printk(KERN_ERR "ramoops: request mem region failed"); | |
133 | err = -EINVAL; | |
134 | goto fail3; | |
135 | } | |
136 | ||
137 | cxt->virt_addr = ioremap(cxt->phys_addr, cxt->size); | |
138 | if (!cxt->virt_addr) { | |
139 | printk(KERN_ERR "ramoops: ioremap failed"); | |
140 | goto fail2; | |
141 | } | |
142 | ||
143 | cxt->dump.dump = ramoops_do_dump; | |
144 | err = kmsg_dump_register(&cxt->dump); | |
145 | if (err) { | |
146 | printk(KERN_ERR "ramoops: registering kmsg dumper failed"); | |
147 | goto fail1; | |
148 | } | |
149 | ||
150 | return 0; | |
151 | ||
152 | fail1: | |
153 | iounmap(cxt->virt_addr); | |
154 | fail2: | |
155 | release_mem_region(cxt->phys_addr, cxt->size); | |
156 | fail3: | |
157 | return err; | |
158 | } | |
159 | ||
c3b92ce9 | 160 | static int __exit ramoops_remove(struct platform_device *pdev) |
56d611a0 MS |
161 | { |
162 | struct ramoops_context *cxt = &oops_cxt; | |
163 | ||
164 | if (kmsg_dump_unregister(&cxt->dump) < 0) | |
165 | printk(KERN_WARNING "ramoops: could not unregister kmsg_dumper"); | |
166 | ||
167 | iounmap(cxt->virt_addr); | |
168 | release_mem_region(cxt->phys_addr, cxt->size); | |
c3b92ce9 | 169 | return 0; |
56d611a0 MS |
170 | } |
171 | ||
c3b92ce9 KP |
172 | static struct platform_driver ramoops_driver = { |
173 | .remove = __exit_p(ramoops_remove), | |
174 | .driver = { | |
175 | .name = "ramoops", | |
176 | .owner = THIS_MODULE, | |
177 | }, | |
178 | }; | |
179 | ||
180 | static int __init ramoops_init(void) | |
181 | { | |
182 | return platform_driver_probe(&ramoops_driver, ramoops_probe); | |
183 | } | |
184 | ||
185 | static void __exit ramoops_exit(void) | |
186 | { | |
187 | platform_driver_unregister(&ramoops_driver); | |
188 | } | |
56d611a0 MS |
189 | |
190 | module_init(ramoops_init); | |
191 | module_exit(ramoops_exit); | |
192 | ||
193 | MODULE_LICENSE("GPL"); | |
194 | MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>"); | |
195 | MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); |