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Marco Stornelli56d611a2010-05-26 14:43:54 -07001/*
2 * RAM Oops/Panic logger
3 *
4 * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
Kees Cook9ba80d92012-05-03 15:45:02 +10005 * Copyright (C) 2011 Kees Cook <keescook@chromium.org>
Marco Stornelli56d611a2010-05-26 14:43:54 -07006 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * version 2 as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
19 * 02110-1301 USA
20 *
21 */
22
Marco Stornelli01692562011-07-26 16:08:57 -070023#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
Marco Stornelli56d611a2010-05-26 14:43:54 -070025#include <linux/kernel.h>
James Bottomley83c1b312011-07-29 17:11:32 +040026#include <linux/err.h>
Marco Stornelli56d611a2010-05-26 14:43:54 -070027#include <linux/module.h>
Anton Vorontsovcbe7cbf2012-07-17 12:11:12 -070028#include <linux/version.h>
Kees Cook9ba80d92012-05-03 15:45:02 +100029#include <linux/pstore.h>
Marco Stornelli56d611a2010-05-26 14:43:54 -070030#include <linux/time.h>
31#include <linux/io.h>
32#include <linux/ioport.h>
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -070033#include <linux/platform_device.h>
Marco Stornelli13aefd72011-07-26 16:08:57 -070034#include <linux/slab.h>
Anton Vorontsov24203032012-07-17 19:49:37 -070035#include <linux/compiler.h>
Anton Vorontsov1894a252012-05-16 05:43:08 -070036#include <linux/pstore_ram.h>
Marco Stornelli56d611a2010-05-26 14:43:54 -070037
38#define RAMOOPS_KERNMSG_HDR "===="
Sergiu Iordache3e5c4fa2011-07-26 16:08:59 -070039#define MIN_MEM_SIZE 4096UL
Marco Stornelli56d611a2010-05-26 14:43:54 -070040
Sergiu Iordache3e5c4fa2011-07-26 16:08:59 -070041static ulong record_size = MIN_MEM_SIZE;
42module_param(record_size, ulong, 0400);
43MODULE_PARM_DESC(record_size,
44 "size of each dump done on oops/panic");
Marco Stornelli56d611a2010-05-26 14:43:54 -070045
Anton Vorontsovb5d38e92012-05-26 06:20:23 -070046static ulong ramoops_console_size = MIN_MEM_SIZE;
47module_param_named(console_size, ramoops_console_size, ulong, 0400);
48MODULE_PARM_DESC(console_size, "size of kernel console log");
49
Anton Vorontsova694d1b2012-07-09 17:10:44 -070050static ulong ramoops_ftrace_size = MIN_MEM_SIZE;
51module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400);
52MODULE_PARM_DESC(ftrace_size, "size of ftrace log");
53
Mark Salyzyn9d5438f2015-01-16 16:01:10 -080054static ulong ramoops_pmsg_size = MIN_MEM_SIZE;
55module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400);
56MODULE_PARM_DESC(pmsg_size, "size of user space message log");
57
Marco Stornelli56d611a2010-05-26 14:43:54 -070058static ulong mem_address;
59module_param(mem_address, ulong, 0400);
60MODULE_PARM_DESC(mem_address,
61 "start of reserved RAM used to store oops/panic logs");
62
63static ulong mem_size;
64module_param(mem_size, ulong, 0400);
65MODULE_PARM_DESC(mem_size,
66 "size of reserved RAM used to store oops/panic logs");
67
Tony Lindgren027bc8b2014-09-16 13:50:01 -070068static unsigned int mem_type;
69module_param(mem_type, uint, 0600);
70MODULE_PARM_DESC(mem_type,
71 "set to 1 to try to use unbuffered memory (default 0)");
72
Marco Stornelli56d611a2010-05-26 14:43:54 -070073static int dump_oops = 1;
74module_param(dump_oops, int, 0600);
75MODULE_PARM_DESC(dump_oops,
76 "set to 1 to dump oopses, 0 to only dump panics (default 1)");
77
Anton Vorontsov39eb7e972012-05-17 00:15:34 -070078static int ramoops_ecc;
79module_param_named(ecc, ramoops_ecc, int, 0600);
80MODULE_PARM_DESC(ramoops_ecc,
Anton Vorontsov5ca5d4e2012-07-09 17:03:19 -070081 "if non-zero, the option enables ECC support and specifies "
82 "ECC buffer size in bytes (1 is a special value, means 16 "
83 "bytes ECC)");
Anton Vorontsov39eb7e972012-05-17 00:15:34 -070084
Kees Cook9ba80d92012-05-03 15:45:02 +100085struct ramoops_context {
Anton Vorontsov896fc1f2012-05-17 00:15:18 -070086 struct persistent_ram_zone **przs;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -070087 struct persistent_ram_zone *cprz;
Anton Vorontsova694d1b2012-07-09 17:10:44 -070088 struct persistent_ram_zone *fprz;
Mark Salyzyn9d5438f2015-01-16 16:01:10 -080089 struct persistent_ram_zone *mprz;
Marco Stornelli56d611a2010-05-26 14:43:54 -070090 phys_addr_t phys_addr;
91 unsigned long size;
Tony Lindgren027bc8b2014-09-16 13:50:01 -070092 unsigned int memtype;
Kees Cook9ba80d92012-05-03 15:45:02 +100093 size_t record_size;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -070094 size_t console_size;
Anton Vorontsova694d1b2012-07-09 17:10:44 -070095 size_t ftrace_size;
Mark Salyzyn9d5438f2015-01-16 16:01:10 -080096 size_t pmsg_size;
Sergiu Iordache6b4d2a22011-07-26 16:08:58 -070097 int dump_oops;
Arve Hjønnevågc31ad082012-05-22 16:33:23 -070098 struct persistent_ram_ecc_info ecc_info;
Anton Vorontsovcac2eb72012-05-26 06:20:20 -070099 unsigned int max_dump_cnt;
100 unsigned int dump_write_cnt;
Liu ShuoX57fd8352014-03-17 11:24:49 +1100101 /* _read_cnt need clear on ramoops_pstore_open */
Anton Vorontsovcac2eb72012-05-26 06:20:20 -0700102 unsigned int dump_read_cnt;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700103 unsigned int console_read_cnt;
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700104 unsigned int ftrace_read_cnt;
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800105 unsigned int pmsg_read_cnt;
Kees Cook9ba80d92012-05-03 15:45:02 +1000106 struct pstore_info pstore;
107};
Marco Stornelli56d611a2010-05-26 14:43:54 -0700108
Marco Stornelli13aefd72011-07-26 16:08:57 -0700109static struct platform_device *dummy;
110static struct ramoops_platform_data *dummy_data;
111
Kees Cook9ba80d92012-05-03 15:45:02 +1000112static int ramoops_pstore_open(struct pstore_info *psi)
Marco Stornelli56d611a2010-05-26 14:43:54 -0700113{
Kees Cook9ba80d92012-05-03 15:45:02 +1000114 struct ramoops_context *cxt = psi->data;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700115
Anton Vorontsovcac2eb72012-05-26 06:20:20 -0700116 cxt->dump_read_cnt = 0;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700117 cxt->console_read_cnt = 0;
Liu ShuoX57fd8352014-03-17 11:24:49 +1100118 cxt->ftrace_read_cnt = 0;
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800119 cxt->pmsg_read_cnt = 0;
Kees Cook9ba80d92012-05-03 15:45:02 +1000120 return 0;
121}
122
Anton Vorontsov755d66b2012-05-26 06:20:22 -0700123static struct persistent_ram_zone *
124ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
125 u64 *id,
126 enum pstore_type_id *typep, enum pstore_type_id type,
127 bool update)
128{
129 struct persistent_ram_zone *prz;
130 int i = (*c)++;
131
132 if (i >= max)
133 return NULL;
134
135 prz = przs[i];
Liu ShuoXb0aa9312014-03-17 13:57:49 -0700136 if (!prz)
137 return NULL;
Anton Vorontsov755d66b2012-05-26 06:20:22 -0700138
Liu ShuoXaa9a4a12014-03-17 11:24:49 +1100139 /* Update old/shadowed buffer. */
140 if (update)
Anton Vorontsov755d66b2012-05-26 06:20:22 -0700141 persistent_ram_save_old(prz);
Liu ShuoXaa9a4a12014-03-17 11:24:49 +1100142
143 if (!persistent_ram_old_size(prz))
144 return NULL;
Anton Vorontsov755d66b2012-05-26 06:20:22 -0700145
146 *typep = type;
147 *id = i;
148
149 return prz;
150}
151
Ben Zhanga28726b2014-10-30 17:14:21 -0700152static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time,
Aruna Balakrishnaiah3f8f80f2013-08-16 13:58:00 -0700153 bool *compressed)
154{
155 char data_type;
Ben Zhanga28726b2014-10-30 17:14:21 -0700156 int header_length = 0;
Aruna Balakrishnaiah3f8f80f2013-08-16 13:58:00 -0700157
Ben Zhanga28726b2014-10-30 17:14:21 -0700158 if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n%n", &time->tv_sec,
159 &time->tv_nsec, &data_type, &header_length) == 3) {
Aruna Balakrishnaiah3f8f80f2013-08-16 13:58:00 -0700160 if (data_type == 'C')
161 *compressed = true;
162 else
163 *compressed = false;
Ben Zhanga28726b2014-10-30 17:14:21 -0700164 } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n%n",
165 &time->tv_sec, &time->tv_nsec, &header_length) == 2) {
Aruna Balakrishnaiah3f8f80f2013-08-16 13:58:00 -0700166 *compressed = false;
167 } else {
168 time->tv_sec = 0;
169 time->tv_nsec = 0;
170 *compressed = false;
171 }
Ben Zhanga28726b2014-10-30 17:14:21 -0700172 return header_length;
Aruna Balakrishnaiah3f8f80f2013-08-16 13:58:00 -0700173}
174
Mark Salyzynf44f9652015-01-13 14:32:50 -0800175static bool prz_ok(struct persistent_ram_zone *prz)
176{
177 return !!prz && !!(persistent_ram_old_size(prz) +
178 persistent_ram_ecc_string(prz, NULL, 0));
179}
180
Kees Cook9ba80d92012-05-03 15:45:02 +1000181static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
Seiji Aguchi755d4fe2012-11-26 16:07:44 -0800182 int *count, struct timespec *time,
Aruna Balakrishnaiah9a4e1392013-08-16 13:53:19 -0700183 char **buf, bool *compressed,
184 struct pstore_info *psi)
Kees Cook9ba80d92012-05-03 15:45:02 +1000185{
186 ssize_t size;
Arve Hjønnevågbd08ec32012-12-05 21:19:51 -0800187 ssize_t ecc_notice_size;
Kees Cook9ba80d92012-05-03 15:45:02 +1000188 struct ramoops_context *cxt = psi->data;
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700189 struct persistent_ram_zone *prz;
Ben Zhanga28726b2014-10-30 17:14:21 -0700190 int header_length;
Kees Cook9ba80d92012-05-03 15:45:02 +1000191
Anton Vorontsov755d66b2012-05-26 06:20:22 -0700192 prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt,
193 cxt->max_dump_cnt, id, type,
194 PSTORE_TYPE_DMESG, 1);
Mark Salyzynf44f9652015-01-13 14:32:50 -0800195 if (!prz_ok(prz))
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700196 prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt,
197 1, id, type, PSTORE_TYPE_CONSOLE, 0);
Mark Salyzynf44f9652015-01-13 14:32:50 -0800198 if (!prz_ok(prz))
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700199 prz = ramoops_get_next_prz(&cxt->fprz, &cxt->ftrace_read_cnt,
200 1, id, type, PSTORE_TYPE_FTRACE, 0);
Mark Salyzynf44f9652015-01-13 14:32:50 -0800201 if (!prz_ok(prz))
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800202 prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt,
203 1, id, type, PSTORE_TYPE_PMSG, 0);
204 if (!prz_ok(prz))
Anton Vorontsov755d66b2012-05-26 06:20:22 -0700205 return 0;
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700206
Ben Zhanga28726b2014-10-30 17:14:21 -0700207 if (!persistent_ram_old(prz))
208 return 0;
209
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700210 size = persistent_ram_old_size(prz);
Ben Zhanga28726b2014-10-30 17:14:21 -0700211 header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz), time,
212 compressed);
213 size -= header_length;
Arve Hjønnevågbd08ec32012-12-05 21:19:51 -0800214
215 /* ECC correction notice */
216 ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
217
218 *buf = kmalloc(size + ecc_notice_size + 1, GFP_KERNEL);
Kees Cook9ba80d92012-05-03 15:45:02 +1000219 if (*buf == NULL)
220 return -ENOMEM;
Kees Cook9ba80d92012-05-03 15:45:02 +1000221
Ben Zhanga28726b2014-10-30 17:14:21 -0700222 memcpy(*buf, (char *)persistent_ram_old(prz) + header_length, size);
Arve Hjønnevågbd08ec32012-12-05 21:19:51 -0800223 persistent_ram_ecc_string(prz, *buf + size, ecc_notice_size + 1);
224
225 return size + ecc_notice_size;
Kees Cook9ba80d92012-05-03 15:45:02 +1000226}
227
Aruna Balakrishnaiah3f8f80f2013-08-16 13:58:00 -0700228static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,
229 bool compressed)
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700230{
231 char *hdr;
Kees Cook1e817fb2012-11-19 10:26:16 -0800232 struct timespec timestamp;
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700233 size_t len;
234
Kees Cook1e817fb2012-11-19 10:26:16 -0800235 /* Report zeroed timestamp if called before timekeeping has resumed. */
236 if (__getnstimeofday(&timestamp)) {
237 timestamp.tv_sec = 0;
238 timestamp.tv_nsec = 0;
239 }
Aruna Balakrishnaiah3f8f80f2013-08-16 13:58:00 -0700240 hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n",
241 (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000),
242 compressed ? 'C' : 'D');
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700243 WARN_ON_ONCE(!hdr);
244 len = hdr ? strlen(hdr) : 0;
245 persistent_ram_write(prz, hdr, len);
246 kfree(hdr);
247
248 return len;
249}
250
Anton Vorontsov24203032012-07-17 19:49:37 -0700251static int notrace ramoops_pstore_write_buf(enum pstore_type_id type,
252 enum kmsg_dump_reason reason,
253 u64 *id, unsigned int part,
Aruna Balakrishnaiah6bbbca72013-06-27 14:02:56 +0530254 const char *buf,
Aruna Balakrishnaiahb3b515b2013-08-16 13:52:47 -0700255 bool compressed, size_t size,
Anton Vorontsov24203032012-07-17 19:49:37 -0700256 struct pstore_info *psi)
Kees Cook9ba80d92012-05-03 15:45:02 +1000257{
Kees Cook9ba80d92012-05-03 15:45:02 +1000258 struct ramoops_context *cxt = psi->data;
Arve Hjønnevågc6289372012-12-11 17:49:24 -0800259 struct persistent_ram_zone *prz;
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700260 size_t hlen;
Kees Cook9ba80d92012-05-03 15:45:02 +1000261
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700262 if (type == PSTORE_TYPE_CONSOLE) {
263 if (!cxt->cprz)
264 return -ENOMEM;
Anton Vorontsovc2b71132012-07-09 17:10:43 -0700265 persistent_ram_write(cxt->cprz, buf, size);
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700266 return 0;
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700267 } else if (type == PSTORE_TYPE_FTRACE) {
268 if (!cxt->fprz)
269 return -ENOMEM;
270 persistent_ram_write(cxt->fprz, buf, size);
271 return 0;
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800272 } else if (type == PSTORE_TYPE_PMSG) {
273 if (!cxt->mprz)
274 return -ENOMEM;
275 persistent_ram_write(cxt->mprz, buf, size);
276 return 0;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700277 }
278
Kees Cook9ba80d92012-05-03 15:45:02 +1000279 if (type != PSTORE_TYPE_DMESG)
280 return -EINVAL;
281
282 /* Out of the various dmesg dump types, ramoops is currently designed
283 * to only store crash logs, rather than storing general kernel logs.
284 */
Seiji Aguchifc2d5572011-01-12 16:59:29 -0800285 if (reason != KMSG_DUMP_OOPS &&
WANG Conga3dd3322012-01-12 17:20:11 -0800286 reason != KMSG_DUMP_PANIC)
Kees Cook9ba80d92012-05-03 15:45:02 +1000287 return -EINVAL;
Seiji Aguchifc2d5572011-01-12 16:59:29 -0800288
Kees Cook9ba80d92012-05-03 15:45:02 +1000289 /* Skip Oopes when configured to do so. */
Sergiu Iordache6b4d2a22011-07-26 16:08:58 -0700290 if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops)
Kees Cook9ba80d92012-05-03 15:45:02 +1000291 return -EINVAL;
292
293 /* Explicitly only take the first part of any new crash.
294 * If our buffer is larger than kmsg_bytes, this can never happen,
295 * and if our buffer is smaller than kmsg_bytes, we don't want the
296 * report split across multiple records.
297 */
298 if (part != 1)
299 return -ENOSPC;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700300
Arve Hjønnevågc6289372012-12-11 17:49:24 -0800301 if (!cxt->przs)
302 return -ENOSPC;
303
304 prz = cxt->przs[cxt->dump_write_cnt];
305
Aruna Balakrishnaiah3f8f80f2013-08-16 13:58:00 -0700306 hlen = ramoops_write_kmsg_hdr(prz, compressed);
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700307 if (size + hlen > prz->buffer_size)
308 size = prz->buffer_size - hlen;
Anton Vorontsovc2b71132012-07-09 17:10:43 -0700309 persistent_ram_write(prz, buf, size);
Marco Stornelli56d611a2010-05-26 14:43:54 -0700310
Anton Vorontsovcac2eb72012-05-26 06:20:20 -0700311 cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt;
Kees Cook9ba80d92012-05-03 15:45:02 +1000312
313 return 0;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700314}
315
Seiji Aguchi755d4fe2012-11-26 16:07:44 -0800316static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count,
Seiji Aguchia9efd392012-11-14 20:27:28 +0000317 struct timespec time, struct pstore_info *psi)
Kees Cook9ba80d92012-05-03 15:45:02 +1000318{
Kees Cook9ba80d92012-05-03 15:45:02 +1000319 struct ramoops_context *cxt = psi->data;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700320 struct persistent_ram_zone *prz;
Kees Cook9ba80d92012-05-03 15:45:02 +1000321
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700322 switch (type) {
323 case PSTORE_TYPE_DMESG:
324 if (id >= cxt->max_dump_cnt)
325 return -EINVAL;
326 prz = cxt->przs[id];
327 break;
328 case PSTORE_TYPE_CONSOLE:
329 prz = cxt->cprz;
330 break;
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700331 case PSTORE_TYPE_FTRACE:
332 prz = cxt->fprz;
333 break;
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800334 case PSTORE_TYPE_PMSG:
335 prz = cxt->mprz;
336 break;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700337 default:
Kees Cook9ba80d92012-05-03 15:45:02 +1000338 return -EINVAL;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700339 }
Kees Cook9ba80d92012-05-03 15:45:02 +1000340
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700341 persistent_ram_free_old(prz);
342 persistent_ram_zap(prz);
Kees Cook9ba80d92012-05-03 15:45:02 +1000343
344 return 0;
345}
346
347static struct ramoops_context oops_cxt = {
348 .pstore = {
349 .owner = THIS_MODULE,
350 .name = "ramoops",
351 .open = ramoops_pstore_open,
352 .read = ramoops_pstore_read,
Anton Vorontsovc2b71132012-07-09 17:10:43 -0700353 .write_buf = ramoops_pstore_write_buf,
Kees Cook9ba80d92012-05-03 15:45:02 +1000354 .erase = ramoops_pstore_erase,
355 },
356};
357
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700358static void ramoops_free_przs(struct ramoops_context *cxt)
359{
360 int i;
361
Liu ShuoX34f0ec82014-03-17 14:07:00 -0700362 cxt->max_dump_cnt = 0;
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700363 if (!cxt->przs)
364 return;
365
Anton Vorontsov90b58d92012-06-18 19:15:51 -0700366 for (i = 0; !IS_ERR_OR_NULL(cxt->przs[i]); i++)
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700367 persistent_ram_free(cxt->przs[i]);
368 kfree(cxt->przs);
369}
370
Greg Kroah-Hartmanf568f6c2012-12-21 15:02:05 -0800371static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt,
372 phys_addr_t *paddr, size_t dump_mem_sz)
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700373{
374 int err = -ENOMEM;
375 int i;
376
377 if (!cxt->record_size)
378 return 0;
379
Arve Hjønnevågc6289372012-12-11 17:49:24 -0800380 if (*paddr + dump_mem_sz - cxt->phys_addr > cxt->size) {
381 dev_err(dev, "no room for dumps\n");
382 return -ENOMEM;
383 }
384
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700385 cxt->max_dump_cnt = dump_mem_sz / cxt->record_size;
386 if (!cxt->max_dump_cnt)
387 return -ENOMEM;
388
389 cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt,
390 GFP_KERNEL);
391 if (!cxt->przs) {
392 dev_err(dev, "failed to initialize a prz array for dumps\n");
Liu ShuoX34f0ec82014-03-17 14:07:00 -0700393 goto fail_prz;
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700394 }
395
396 for (i = 0; i < cxt->max_dump_cnt; i++) {
397 size_t sz = cxt->record_size;
398
Arve Hjønnevågc31ad082012-05-22 16:33:23 -0700399 cxt->przs[i] = persistent_ram_new(*paddr, sz, 0,
Tony Lindgren027bc8b2014-09-16 13:50:01 -0700400 &cxt->ecc_info,
401 cxt->memtype);
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700402 if (IS_ERR(cxt->przs[i])) {
403 err = PTR_ERR(cxt->przs[i]);
404 dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
405 sz, (unsigned long long)*paddr, err);
406 goto fail_prz;
407 }
408 *paddr += sz;
409 }
410
411 return 0;
412fail_prz:
413 ramoops_free_przs(cxt);
414 return err;
415}
416
Greg Kroah-Hartmanf568f6c2012-12-21 15:02:05 -0800417static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt,
418 struct persistent_ram_zone **prz,
419 phys_addr_t *paddr, size_t sz, u32 sig)
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700420{
421 if (!sz)
422 return 0;
423
Arve Hjønnevågc6289372012-12-11 17:49:24 -0800424 if (*paddr + sz - cxt->phys_addr > cxt->size) {
425 dev_err(dev, "no room for mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
426 sz, (unsigned long long)*paddr,
427 cxt->size, (unsigned long long)cxt->phys_addr);
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700428 return -ENOMEM;
Arve Hjønnevågc6289372012-12-11 17:49:24 -0800429 }
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700430
Tony Lindgren027bc8b2014-09-16 13:50:01 -0700431 *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, cxt->memtype);
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700432 if (IS_ERR(*prz)) {
433 int err = PTR_ERR(*prz);
434
435 dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
436 sz, (unsigned long long)*paddr, err);
437 return err;
438 }
439
440 persistent_ram_zap(*prz);
441
442 *paddr += sz;
443
444 return 0;
445}
446
Greg Kroah-Hartmanf568f6c2012-12-21 15:02:05 -0800447static int ramoops_probe(struct platform_device *pdev)
Marco Stornelli56d611a2010-05-26 14:43:54 -0700448{
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700449 struct device *dev = &pdev->dev;
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700450 struct ramoops_platform_data *pdata = pdev->dev.platform_data;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700451 struct ramoops_context *cxt = &oops_cxt;
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700452 size_t dump_mem_sz;
453 phys_addr_t paddr;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700454 int err = -EINVAL;
455
Kees Cook9ba80d92012-05-03 15:45:02 +1000456 /* Only a single ramoops area allowed at a time, so fail extra
457 * probes.
458 */
Anton Vorontsovcac2eb72012-05-26 06:20:20 -0700459 if (cxt->max_dump_cnt)
Kees Cook9ba80d92012-05-03 15:45:02 +1000460 goto fail_out;
461
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700462 if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size &&
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800463 !pdata->ftrace_size && !pdata->pmsg_size)) {
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700464 pr_err("The memory size and the record/console size must be "
Sergiu Iordache3e5c4fa2011-07-26 16:08:59 -0700465 "non-zero\n");
Kees Cook9ba80d92012-05-03 15:45:02 +1000466 goto fail_out;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700467 }
468
Maxime Bizon3bd11cf2013-08-30 18:06:41 +0200469 if (pdata->record_size && !is_power_of_2(pdata->record_size))
Maxime Bizonb042e472012-10-22 11:19:28 +0200470 pdata->record_size = rounddown_pow_of_two(pdata->record_size);
Maxime Bizon3bd11cf2013-08-30 18:06:41 +0200471 if (pdata->console_size && !is_power_of_2(pdata->console_size))
Maxime Bizonb042e472012-10-22 11:19:28 +0200472 pdata->console_size = rounddown_pow_of_two(pdata->console_size);
Maxime Bizon3bd11cf2013-08-30 18:06:41 +0200473 if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size))
Maxime Bizonb042e472012-10-22 11:19:28 +0200474 pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size);
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800475 if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size))
476 pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size);
Marco Stornelli56d611a2010-05-26 14:43:54 -0700477
Marco Stornelli13aefd72011-07-26 16:08:57 -0700478 cxt->size = pdata->mem_size;
479 cxt->phys_addr = pdata->mem_address;
Tony Lindgren027bc8b2014-09-16 13:50:01 -0700480 cxt->memtype = pdata->mem_type;
Sergiu Iordache3e5c4fa2011-07-26 16:08:59 -0700481 cxt->record_size = pdata->record_size;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700482 cxt->console_size = pdata->console_size;
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700483 cxt->ftrace_size = pdata->ftrace_size;
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800484 cxt->pmsg_size = pdata->pmsg_size;
Sergiu Iordache6b4d2a22011-07-26 16:08:58 -0700485 cxt->dump_oops = pdata->dump_oops;
Arve Hjønnevågc31ad082012-05-22 16:33:23 -0700486 cxt->ecc_info = pdata->ecc_info;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700487
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700488 paddr = cxt->phys_addr;
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700489
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800490 dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size
491 - cxt->pmsg_size;
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700492 err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz);
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700493 if (err)
494 goto fail_out;
495
Anton Vorontsovcbe7cbf2012-07-17 12:11:12 -0700496 err = ramoops_init_prz(dev, cxt, &cxt->cprz, &paddr,
497 cxt->console_size, 0);
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700498 if (err)
499 goto fail_init_cprz;
500
Anton Vorontsovcbe7cbf2012-07-17 12:11:12 -0700501 err = ramoops_init_prz(dev, cxt, &cxt->fprz, &paddr, cxt->ftrace_size,
502 LINUX_VERSION_CODE);
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700503 if (err)
504 goto fail_init_fprz;
505
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800506 err = ramoops_init_prz(dev, cxt, &cxt->mprz, &paddr, cxt->pmsg_size, 0);
507 if (err)
508 goto fail_init_mprz;
509
Kees Cook9ba80d92012-05-03 15:45:02 +1000510 cxt->pstore.data = cxt;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700511 /*
Anton Vorontsova384f6412012-07-19 15:47:11 -0700512 * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we
513 * have to handle dumps, we must have at least record_size buffer. And
514 * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be
515 * ZERO_SIZE_PTR).
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700516 */
Anton Vorontsova384f6412012-07-19 15:47:11 -0700517 if (cxt->console_size)
518 cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */
519 cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize);
Kees Cook9ba80d92012-05-03 15:45:02 +1000520 cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL);
521 spin_lock_init(&cxt->pstore.buf_lock);
522 if (!cxt->pstore.buf) {
523 pr_err("cannot allocate pstore buffer\n");
Wei Yongjun47110b82013-05-07 19:39:20 +0800524 err = -ENOMEM;
Kees Cook9ba80d92012-05-03 15:45:02 +1000525 goto fail_clear;
526 }
527
Kees Cook9ba80d92012-05-03 15:45:02 +1000528 err = pstore_register(&cxt->pstore);
Marco Stornelli56d611a2010-05-26 14:43:54 -0700529 if (err) {
Kees Cook9ba80d92012-05-03 15:45:02 +1000530 pr_err("registering with pstore failed\n");
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700531 goto fail_buf;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700532 }
533
Kees Cookc7552012012-01-12 17:20:59 -0800534 /*
535 * Update the module parameter variables as well so they are visible
536 * through /sys/module/ramoops/parameters/
537 */
538 mem_size = pdata->mem_size;
539 mem_address = pdata->mem_address;
540 record_size = pdata->record_size;
541 dump_oops = pdata->dump_oops;
Wang Long62f269e2015-03-09 07:39:07 +0000542 ramoops_console_size = pdata->console_size;
543 ramoops_pmsg_size = pdata->pmsg_size;
544 ramoops_ftrace_size = pdata->ftrace_size;
Kees Cookc7552012012-01-12 17:20:59 -0800545
Arve Hjønnevågc31ad082012-05-22 16:33:23 -0700546 pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n",
Randy Dunlapd109a672012-05-03 15:45:03 +1000547 cxt->size, (unsigned long long)cxt->phys_addr,
Arve Hjønnevågc31ad082012-05-22 16:33:23 -0700548 cxt->ecc_info.ecc_size, cxt->ecc_info.block_size);
Kees Cook9ba80d92012-05-03 15:45:02 +1000549
Marco Stornelli56d611a2010-05-26 14:43:54 -0700550 return 0;
551
Kees Cook9ba80d92012-05-03 15:45:02 +1000552fail_buf:
553 kfree(cxt->pstore.buf);
554fail_clear:
555 cxt->pstore.bufsize = 0;
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800556 kfree(cxt->mprz);
557fail_init_mprz:
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700558 kfree(cxt->fprz);
559fail_init_fprz:
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700560 kfree(cxt->cprz);
561fail_init_cprz:
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700562 ramoops_free_przs(cxt);
Kees Cook9ba80d92012-05-03 15:45:02 +1000563fail_out:
Marco Stornelli56d611a2010-05-26 14:43:54 -0700564 return err;
565}
566
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700567static int __exit ramoops_remove(struct platform_device *pdev)
Marco Stornelli56d611a2010-05-26 14:43:54 -0700568{
Kees Cook9ba80d92012-05-03 15:45:02 +1000569#if 0
570 /* TODO(kees): We cannot unload ramoops since pstore doesn't support
571 * unregistering yet.
572 */
Marco Stornelli56d611a2010-05-26 14:43:54 -0700573 struct ramoops_context *cxt = &oops_cxt;
574
Marco Stornelli56d611a2010-05-26 14:43:54 -0700575 iounmap(cxt->virt_addr);
576 release_mem_region(cxt->phys_addr, cxt->size);
Anton Vorontsovcac2eb72012-05-26 06:20:20 -0700577 cxt->max_dump_cnt = 0;
Kees Cook9ba80d92012-05-03 15:45:02 +1000578
579 /* TODO(kees): When pstore supports unregistering, call it here. */
580 kfree(cxt->pstore.buf);
581 cxt->pstore.bufsize = 0;
582
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700583 return 0;
Kees Cook9ba80d92012-05-03 15:45:02 +1000584#endif
585 return -EBUSY;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700586}
587
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700588static struct platform_driver ramoops_driver = {
Anton Vorontsov924d3712012-06-18 19:15:50 -0700589 .probe = ramoops_probe,
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700590 .remove = __exit_p(ramoops_remove),
591 .driver = {
592 .name = "ramoops",
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700593 },
594};
595
Anton Vorontsov924d3712012-06-18 19:15:50 -0700596static void ramoops_register_dummy(void)
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700597{
Anton Vorontsov924d3712012-06-18 19:15:50 -0700598 if (!mem_size)
599 return;
Marco Stornelli13aefd72011-07-26 16:08:57 -0700600
Anton Vorontsov924d3712012-06-18 19:15:50 -0700601 pr_info("using module parameters\n");
602
603 dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL);
604 if (!dummy_data) {
605 pr_info("could not allocate pdata\n");
606 return;
Marco Stornelli13aefd72011-07-26 16:08:57 -0700607 }
608
Anton Vorontsov924d3712012-06-18 19:15:50 -0700609 dummy_data->mem_size = mem_size;
610 dummy_data->mem_address = mem_address;
Tony Lindgren027bc8b2014-09-16 13:50:01 -0700611 dummy_data->mem_type = 0;
Anton Vorontsov924d3712012-06-18 19:15:50 -0700612 dummy_data->record_size = record_size;
613 dummy_data->console_size = ramoops_console_size;
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700614 dummy_data->ftrace_size = ramoops_ftrace_size;
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800615 dummy_data->pmsg_size = ramoops_pmsg_size;
Anton Vorontsov924d3712012-06-18 19:15:50 -0700616 dummy_data->dump_oops = dump_oops;
Anton Vorontsov5ca5d4e2012-07-09 17:03:19 -0700617 /*
618 * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC
619 * (using 1 byte for ECC isn't much of use anyway).
620 */
Arve Hjønnevågc31ad082012-05-22 16:33:23 -0700621 dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc;
Anton Vorontsov924d3712012-06-18 19:15:50 -0700622
623 dummy = platform_device_register_data(NULL, "ramoops", -1,
624 dummy_data, sizeof(struct ramoops_platform_data));
625 if (IS_ERR(dummy)) {
626 pr_info("could not create platform device: %ld\n",
627 PTR_ERR(dummy));
628 }
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700629}
630
Anton Vorontsov924d3712012-06-18 19:15:50 -0700631static int __init ramoops_init(void)
632{
633 ramoops_register_dummy();
634 return platform_driver_register(&ramoops_driver);
635}
636postcore_initcall(ramoops_init);
637
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700638static void __exit ramoops_exit(void)
639{
640 platform_driver_unregister(&ramoops_driver);
Jovi Zhangb4a871b2012-08-20 14:58:26 +0800641 platform_device_unregister(dummy);
Marco Stornelli13aefd72011-07-26 16:08:57 -0700642 kfree(dummy_data);
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700643}
Marco Stornelli56d611a2010-05-26 14:43:54 -0700644module_exit(ramoops_exit);
645
646MODULE_LICENSE("GPL");
647MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>");
648MODULE_DESCRIPTION("RAM Oops/Panic logger/driver");