blob: 11c7a171c0a15a0c7ae4b4ad281f7e89028d1b64 [file] [log] [blame]
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/io.h>
31#include <linux/ioport.h>
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -070032#include <linux/platform_device.h>
Marco Stornelli13aefd72011-07-26 16:08:57 -070033#include <linux/slab.h>
Anton Vorontsov24203032012-07-17 19:49:37 -070034#include <linux/compiler.h>
Anton Vorontsov1894a252012-05-16 05:43:08 -070035#include <linux/pstore_ram.h>
Greg Hackmann35da6092016-01-07 15:40:56 -080036#include <linux/of.h>
37#include <linux/of_address.h>
Marco Stornelli56d611a2010-05-26 14:43:54 -070038
39#define RAMOOPS_KERNMSG_HDR "===="
Sergiu Iordache3e5c4fa2011-07-26 16:08:59 -070040#define MIN_MEM_SIZE 4096UL
Marco Stornelli56d611a2010-05-26 14:43:54 -070041
Sergiu Iordache3e5c4fa2011-07-26 16:08:59 -070042static ulong record_size = MIN_MEM_SIZE;
43module_param(record_size, ulong, 0400);
44MODULE_PARM_DESC(record_size,
45 "size of each dump done on oops/panic");
Marco Stornelli56d611a2010-05-26 14:43:54 -070046
Anton Vorontsovb5d38e92012-05-26 06:20:23 -070047static ulong ramoops_console_size = MIN_MEM_SIZE;
48module_param_named(console_size, ramoops_console_size, ulong, 0400);
49MODULE_PARM_DESC(console_size, "size of kernel console log");
50
Anton Vorontsova694d1b2012-07-09 17:10:44 -070051static ulong ramoops_ftrace_size = MIN_MEM_SIZE;
52module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400);
53MODULE_PARM_DESC(ftrace_size, "size of ftrace log");
54
Mark Salyzyn9d5438f2015-01-16 16:01:10 -080055static ulong ramoops_pmsg_size = MIN_MEM_SIZE;
56module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400);
57MODULE_PARM_DESC(pmsg_size, "size of user space message log");
58
Wiebe, Wladislav (Nokia - DE/Ulm)764fd6392015-11-13 12:10:05 +000059static unsigned long long mem_address;
David Howellsb90fe0c2017-04-04 16:54:29 +010060module_param_hw(mem_address, ullong, other, 0400);
Marco Stornelli56d611a2010-05-26 14:43:54 -070061MODULE_PARM_DESC(mem_address,
62 "start of reserved RAM used to store oops/panic logs");
63
64static ulong mem_size;
65module_param(mem_size, ulong, 0400);
66MODULE_PARM_DESC(mem_size,
67 "size of reserved RAM used to store oops/panic logs");
68
Tony Lindgren027bc8b2014-09-16 13:50:01 -070069static unsigned int mem_type;
70module_param(mem_type, uint, 0600);
71MODULE_PARM_DESC(mem_type,
72 "set to 1 to try to use unbuffered memory (default 0)");
73
Marco Stornelli56d611a2010-05-26 14:43:54 -070074static int dump_oops = 1;
75module_param(dump_oops, int, 0600);
76MODULE_PARM_DESC(dump_oops,
77 "set to 1 to dump oopses, 0 to only dump panics (default 1)");
78
Anton Vorontsov39eb7e972012-05-17 00:15:34 -070079static int ramoops_ecc;
80module_param_named(ecc, ramoops_ecc, int, 0600);
81MODULE_PARM_DESC(ramoops_ecc,
Anton Vorontsov5ca5d4e2012-07-09 17:03:19 -070082 "if non-zero, the option enables ECC support and specifies "
83 "ECC buffer size in bytes (1 is a special value, means 16 "
84 "bytes ECC)");
Anton Vorontsov39eb7e972012-05-17 00:15:34 -070085
Kees Cook9ba80d92012-05-03 15:45:02 +100086struct ramoops_context {
Kees Cooka5d23b92016-11-11 14:30:11 -080087 struct persistent_ram_zone **dprzs; /* Oops dump zones */
88 struct persistent_ram_zone *cprz; /* Console zone */
89 struct persistent_ram_zone **fprzs; /* Ftrace zones */
90 struct persistent_ram_zone *mprz; /* PMSG zone */
Marco Stornelli56d611a2010-05-26 14:43:54 -070091 phys_addr_t phys_addr;
92 unsigned long size;
Tony Lindgren027bc8b2014-09-16 13:50:01 -070093 unsigned int memtype;
Kees Cook9ba80d92012-05-03 15:45:02 +100094 size_t record_size;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -070095 size_t console_size;
Anton Vorontsova694d1b2012-07-09 17:10:44 -070096 size_t ftrace_size;
Mark Salyzyn9d5438f2015-01-16 16:01:10 -080097 size_t pmsg_size;
Sergiu Iordache6b4d2a22011-07-26 16:08:58 -070098 int dump_oops;
Joel Fernandesa1cf53a2016-10-20 00:34:04 -070099 u32 flags;
Arve Hjønnevågc31ad082012-05-22 16:33:23 -0700100 struct persistent_ram_ecc_info ecc_info;
Anton Vorontsovcac2eb72012-05-26 06:20:20 -0700101 unsigned int max_dump_cnt;
102 unsigned int dump_write_cnt;
Liu ShuoX57fd8352014-03-17 11:24:49 +1100103 /* _read_cnt need clear on ramoops_pstore_open */
Anton Vorontsovcac2eb72012-05-26 06:20:20 -0700104 unsigned int dump_read_cnt;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700105 unsigned int console_read_cnt;
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700106 unsigned int max_ftrace_cnt;
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700107 unsigned int ftrace_read_cnt;
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800108 unsigned int pmsg_read_cnt;
Kees Cook9ba80d92012-05-03 15:45:02 +1000109 struct pstore_info pstore;
110};
Marco Stornelli56d611a2010-05-26 14:43:54 -0700111
Marco Stornelli13aefd72011-07-26 16:08:57 -0700112static struct platform_device *dummy;
113static struct ramoops_platform_data *dummy_data;
114
Kees Cook9ba80d92012-05-03 15:45:02 +1000115static int ramoops_pstore_open(struct pstore_info *psi)
Marco Stornelli56d611a2010-05-26 14:43:54 -0700116{
Kees Cook9ba80d92012-05-03 15:45:02 +1000117 struct ramoops_context *cxt = psi->data;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700118
Anton Vorontsovcac2eb72012-05-26 06:20:20 -0700119 cxt->dump_read_cnt = 0;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700120 cxt->console_read_cnt = 0;
Liu ShuoX57fd8352014-03-17 11:24:49 +1100121 cxt->ftrace_read_cnt = 0;
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800122 cxt->pmsg_read_cnt = 0;
Kees Cook9ba80d92012-05-03 15:45:02 +1000123 return 0;
124}
125
Anton Vorontsov755d66b2012-05-26 06:20:22 -0700126static struct persistent_ram_zone *
127ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
128 u64 *id,
129 enum pstore_type_id *typep, enum pstore_type_id type,
130 bool update)
131{
132 struct persistent_ram_zone *prz;
133 int i = (*c)++;
134
Kees Cook46418412017-02-10 10:15:34 -0800135 /* Give up if we never existed or have hit the end. */
136 if (!przs || i >= max)
Anton Vorontsov755d66b2012-05-26 06:20:22 -0700137 return NULL;
138
139 prz = przs[i];
Liu ShuoXb0aa9312014-03-17 13:57:49 -0700140 if (!prz)
141 return NULL;
Anton Vorontsov755d66b2012-05-26 06:20:22 -0700142
Liu ShuoXaa9a4a12014-03-17 11:24:49 +1100143 /* Update old/shadowed buffer. */
144 if (update)
Anton Vorontsov755d66b2012-05-26 06:20:22 -0700145 persistent_ram_save_old(prz);
Liu ShuoXaa9a4a12014-03-17 11:24:49 +1100146
147 if (!persistent_ram_old_size(prz))
148 return NULL;
Anton Vorontsov755d66b2012-05-26 06:20:22 -0700149
150 *typep = type;
151 *id = i;
152
153 return prz;
154}
155
Ben Zhanga28726b2014-10-30 17:14:21 -0700156static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time,
Aruna Balakrishnaiah3f8f80f2013-08-16 13:58:00 -0700157 bool *compressed)
158{
159 char data_type;
Ben Zhanga28726b2014-10-30 17:14:21 -0700160 int header_length = 0;
Aruna Balakrishnaiah3f8f80f2013-08-16 13:58:00 -0700161
Ben Zhanga28726b2014-10-30 17:14:21 -0700162 if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n%n", &time->tv_sec,
163 &time->tv_nsec, &data_type, &header_length) == 3) {
Aruna Balakrishnaiah3f8f80f2013-08-16 13:58:00 -0700164 if (data_type == 'C')
165 *compressed = true;
166 else
167 *compressed = false;
Ben Zhanga28726b2014-10-30 17:14:21 -0700168 } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n%n",
169 &time->tv_sec, &time->tv_nsec, &header_length) == 2) {
Aruna Balakrishnaiah3f8f80f2013-08-16 13:58:00 -0700170 *compressed = false;
171 } else {
172 time->tv_sec = 0;
173 time->tv_nsec = 0;
174 *compressed = false;
175 }
Ben Zhanga28726b2014-10-30 17:14:21 -0700176 return header_length;
Aruna Balakrishnaiah3f8f80f2013-08-16 13:58:00 -0700177}
178
Mark Salyzynf44f9652015-01-13 14:32:50 -0800179static bool prz_ok(struct persistent_ram_zone *prz)
180{
181 return !!prz && !!(persistent_ram_old_size(prz) +
182 persistent_ram_ecc_string(prz, NULL, 0));
183}
184
Joel Fernandes2fbea822016-10-20 00:34:06 -0700185static ssize_t ftrace_log_combine(struct persistent_ram_zone *dest,
186 struct persistent_ram_zone *src)
187{
188 size_t dest_size, src_size, total, dest_off, src_off;
189 size_t dest_idx = 0, src_idx = 0, merged_idx = 0;
190 void *merged_buf;
191 struct pstore_ftrace_record *drec, *srec, *mrec;
192 size_t record_size = sizeof(struct pstore_ftrace_record);
193
194 dest_off = dest->old_log_size % record_size;
195 dest_size = dest->old_log_size - dest_off;
196
197 src_off = src->old_log_size % record_size;
198 src_size = src->old_log_size - src_off;
199
200 total = dest_size + src_size;
201 merged_buf = kmalloc(total, GFP_KERNEL);
202 if (!merged_buf)
203 return -ENOMEM;
204
205 drec = (struct pstore_ftrace_record *)(dest->old_log + dest_off);
206 srec = (struct pstore_ftrace_record *)(src->old_log + src_off);
207 mrec = (struct pstore_ftrace_record *)(merged_buf);
208
209 while (dest_size > 0 && src_size > 0) {
210 if (pstore_ftrace_read_timestamp(&drec[dest_idx]) <
211 pstore_ftrace_read_timestamp(&srec[src_idx])) {
212 mrec[merged_idx++] = drec[dest_idx++];
213 dest_size -= record_size;
214 } else {
215 mrec[merged_idx++] = srec[src_idx++];
216 src_size -= record_size;
217 }
218 }
219
220 while (dest_size > 0) {
221 mrec[merged_idx++] = drec[dest_idx++];
222 dest_size -= record_size;
223 }
224
225 while (src_size > 0) {
226 mrec[merged_idx++] = srec[src_idx++];
227 src_size -= record_size;
228 }
229
230 kfree(dest->old_log);
231 dest->old_log = merged_buf;
232 dest->old_log_size = total;
233
234 return 0;
235}
236
Kees Cook125cc422017-03-03 22:09:18 -0800237static ssize_t ramoops_pstore_read(struct pstore_record *record)
Kees Cook9ba80d92012-05-03 15:45:02 +1000238{
Joel Fernandes2fbea822016-10-20 00:34:06 -0700239 ssize_t size = 0;
Kees Cook125cc422017-03-03 22:09:18 -0800240 struct ramoops_context *cxt = record->psi->data;
Ben Zhange036bd32015-05-21 09:50:34 -0700241 struct persistent_ram_zone *prz = NULL;
242 int header_length = 0;
Joel Fernandes2fbea822016-10-20 00:34:06 -0700243 bool free_prz = false;
Kees Cook9ba80d92012-05-03 15:45:02 +1000244
Kees Cook125cc422017-03-03 22:09:18 -0800245 /*
246 * Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but
Ben Zhange036bd32015-05-21 09:50:34 -0700247 * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have
248 * valid time stamps, so it is initialized to zero.
249 */
Kees Cook125cc422017-03-03 22:09:18 -0800250 record->time.tv_sec = 0;
251 record->time.tv_nsec = 0;
252 record->compressed = false;
Ben Zhange036bd32015-05-21 09:50:34 -0700253
254 /* Find the next valid persistent_ram_zone for DMESG */
255 while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) {
Kees Cooka5d23b92016-11-11 14:30:11 -0800256 prz = ramoops_get_next_prz(cxt->dprzs, &cxt->dump_read_cnt,
Kees Cook125cc422017-03-03 22:09:18 -0800257 cxt->max_dump_cnt, &record->id,
258 &record->type,
Ben Zhange036bd32015-05-21 09:50:34 -0700259 PSTORE_TYPE_DMESG, 1);
260 if (!prz_ok(prz))
261 continue;
262 header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz),
Kees Cook125cc422017-03-03 22:09:18 -0800263 &record->time,
264 &record->compressed);
Ben Zhange036bd32015-05-21 09:50:34 -0700265 /* Clear and skip this DMESG record if it has no valid header */
266 if (!header_length) {
267 persistent_ram_free_old(prz);
268 persistent_ram_zap(prz);
269 prz = NULL;
270 }
271 }
272
Mark Salyzynf44f9652015-01-13 14:32:50 -0800273 if (!prz_ok(prz))
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700274 prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt,
Kees Cook125cc422017-03-03 22:09:18 -0800275 1, &record->id, &record->type,
276 PSTORE_TYPE_CONSOLE, 0);
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700277
Mark Salyzynf44f9652015-01-13 14:32:50 -0800278 if (!prz_ok(prz))
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800279 prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt,
Kees Cook125cc422017-03-03 22:09:18 -0800280 1, &record->id, &record->type,
281 PSTORE_TYPE_PMSG, 0);
Joel Fernandes2fbea822016-10-20 00:34:06 -0700282
283 /* ftrace is last since it may want to dynamically allocate memory. */
Kees Cook46418412017-02-10 10:15:34 -0800284 if (!prz_ok(prz)) {
Joel Fernandes2fbea822016-10-20 00:34:06 -0700285 if (!(cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)) {
286 prz = ramoops_get_next_prz(cxt->fprzs,
Kees Cook125cc422017-03-03 22:09:18 -0800287 &cxt->ftrace_read_cnt, 1, &record->id,
288 &record->type, PSTORE_TYPE_FTRACE, 0);
Joel Fernandes2fbea822016-10-20 00:34:06 -0700289 } else {
290 /*
291 * Build a new dummy record which combines all the
292 * per-cpu records including metadata and ecc info.
293 */
294 struct persistent_ram_zone *tmp_prz, *prz_next;
295
296 tmp_prz = kzalloc(sizeof(struct persistent_ram_zone),
297 GFP_KERNEL);
298 if (!tmp_prz)
299 return -ENOMEM;
Kees Cook6c22e4a2018-12-03 16:39:01 -0800300 prz = tmp_prz;
Joel Fernandes2fbea822016-10-20 00:34:06 -0700301 free_prz = true;
302
303 while (cxt->ftrace_read_cnt < cxt->max_ftrace_cnt) {
304 prz_next = ramoops_get_next_prz(cxt->fprzs,
305 &cxt->ftrace_read_cnt,
Kees Cook125cc422017-03-03 22:09:18 -0800306 cxt->max_ftrace_cnt,
307 &record->id,
308 &record->type,
309 PSTORE_TYPE_FTRACE, 0);
Joel Fernandes2fbea822016-10-20 00:34:06 -0700310
311 if (!prz_ok(prz_next))
312 continue;
313
314 tmp_prz->ecc_info = prz_next->ecc_info;
315 tmp_prz->corrected_bytes +=
316 prz_next->corrected_bytes;
317 tmp_prz->bad_blocks += prz_next->bad_blocks;
318 size = ftrace_log_combine(tmp_prz, prz_next);
319 if (size)
320 goto out;
321 }
Kees Cook125cc422017-03-03 22:09:18 -0800322 record->id = 0;
Joel Fernandes2fbea822016-10-20 00:34:06 -0700323 }
324 }
325
326 if (!prz_ok(prz)) {
327 size = 0;
328 goto out;
329 }
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700330
Ben Zhange036bd32015-05-21 09:50:34 -0700331 size = persistent_ram_old_size(prz) - header_length;
Arve Hjønnevågbd08ec32012-12-05 21:19:51 -0800332
333 /* ECC correction notice */
Kees Cook125cc422017-03-03 22:09:18 -0800334 record->ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
Arve Hjønnevågbd08ec32012-12-05 21:19:51 -0800335
Kees Cook125cc422017-03-03 22:09:18 -0800336 record->buf = kmalloc(size + record->ecc_notice_size + 1, GFP_KERNEL);
337 if (record->buf == NULL) {
Joel Fernandes2fbea822016-10-20 00:34:06 -0700338 size = -ENOMEM;
339 goto out;
340 }
Kees Cook9ba80d92012-05-03 15:45:02 +1000341
Kees Cook125cc422017-03-03 22:09:18 -0800342 memcpy(record->buf, (char *)persistent_ram_old(prz) + header_length,
343 size);
Joel Fernandes2fbea822016-10-20 00:34:06 -0700344
Kees Cook125cc422017-03-03 22:09:18 -0800345 persistent_ram_ecc_string(prz, record->buf + size,
346 record->ecc_notice_size + 1);
Arve Hjønnevågbd08ec32012-12-05 21:19:51 -0800347
Joel Fernandes2fbea822016-10-20 00:34:06 -0700348out:
349 if (free_prz) {
350 kfree(prz->old_log);
351 kfree(prz);
352 }
353
Geliang Tang8cfc8dd2016-02-18 22:04:22 +0800354 return size;
Kees Cook9ba80d92012-05-03 15:45:02 +1000355}
356
Aruna Balakrishnaiah3f8f80f2013-08-16 13:58:00 -0700357static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,
Kees Cookc7f3c5952017-05-19 15:29:10 -0700358 struct pstore_record *record)
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700359{
360 char *hdr;
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700361 size_t len;
362
Aruna Balakrishnaiah3f8f80f2013-08-16 13:58:00 -0700363 hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n",
Kees Cookc7f3c5952017-05-19 15:29:10 -0700364 record->time.tv_sec,
365 record->time.tv_nsec / 1000,
366 record->compressed ? 'C' : 'D');
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700367 WARN_ON_ONCE(!hdr);
368 len = hdr ? strlen(hdr) : 0;
369 persistent_ram_write(prz, hdr, len);
370 kfree(hdr);
371
372 return len;
373}
374
Kees Cook4c9ec212017-03-05 22:41:10 -0800375static int notrace ramoops_pstore_write(struct pstore_record *record)
Kees Cook9ba80d92012-05-03 15:45:02 +1000376{
Kees Cookb10b4712017-03-05 00:27:54 -0800377 struct ramoops_context *cxt = record->psi->data;
Arve Hjønnevågc6289372012-12-11 17:49:24 -0800378 struct persistent_ram_zone *prz;
Kees Cookb10b4712017-03-05 00:27:54 -0800379 size_t size, hlen;
Kees Cook9ba80d92012-05-03 15:45:02 +1000380
Kees Cookb10b4712017-03-05 00:27:54 -0800381 if (record->type == PSTORE_TYPE_CONSOLE) {
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700382 if (!cxt->cprz)
383 return -ENOMEM;
Kees Cookb10b4712017-03-05 00:27:54 -0800384 persistent_ram_write(cxt->cprz, record->buf, record->size);
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700385 return 0;
Kees Cookb10b4712017-03-05 00:27:54 -0800386 } else if (record->type == PSTORE_TYPE_FTRACE) {
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700387 int zonenum;
388
389 if (!cxt->fprzs)
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700390 return -ENOMEM;
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700391 /*
392 * Choose zone by if we're using per-cpu buffers.
393 */
394 if (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
395 zonenum = smp_processor_id();
396 else
397 zonenum = 0;
398
Kees Cookb10b4712017-03-05 00:27:54 -0800399 persistent_ram_write(cxt->fprzs[zonenum], record->buf,
400 record->size);
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700401 return 0;
Kees Cookb10b4712017-03-05 00:27:54 -0800402 } else if (record->type == PSTORE_TYPE_PMSG) {
Joel Fernandesd8991f52016-10-20 00:34:02 -0700403 pr_warn_ratelimited("PMSG shouldn't call %s\n", __func__);
404 return -EINVAL;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700405 }
406
Kees Cookb10b4712017-03-05 00:27:54 -0800407 if (record->type != PSTORE_TYPE_DMESG)
Kees Cook9ba80d92012-05-03 15:45:02 +1000408 return -EINVAL;
409
Kees Cookb10b4712017-03-05 00:27:54 -0800410 /*
411 * Out of the various dmesg dump types, ramoops is currently designed
Kees Cook9ba80d92012-05-03 15:45:02 +1000412 * to only store crash logs, rather than storing general kernel logs.
413 */
Kees Cookb10b4712017-03-05 00:27:54 -0800414 if (record->reason != KMSG_DUMP_OOPS &&
415 record->reason != KMSG_DUMP_PANIC)
Kees Cook9ba80d92012-05-03 15:45:02 +1000416 return -EINVAL;
Seiji Aguchifc2d5572011-01-12 16:59:29 -0800417
Kees Cook9ba80d92012-05-03 15:45:02 +1000418 /* Skip Oopes when configured to do so. */
Kees Cookb10b4712017-03-05 00:27:54 -0800419 if (record->reason == KMSG_DUMP_OOPS && !cxt->dump_oops)
Kees Cook9ba80d92012-05-03 15:45:02 +1000420 return -EINVAL;
421
Kees Cookb10b4712017-03-05 00:27:54 -0800422 /*
423 * Explicitly only take the first part of any new crash.
Kees Cook9ba80d92012-05-03 15:45:02 +1000424 * If our buffer is larger than kmsg_bytes, this can never happen,
425 * and if our buffer is smaller than kmsg_bytes, we don't want the
426 * report split across multiple records.
427 */
Kees Cookb10b4712017-03-05 00:27:54 -0800428 if (record->part != 1)
Kees Cook9ba80d92012-05-03 15:45:02 +1000429 return -ENOSPC;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700430
Kees Cooka5d23b92016-11-11 14:30:11 -0800431 if (!cxt->dprzs)
Arve Hjønnevågc6289372012-12-11 17:49:24 -0800432 return -ENOSPC;
433
Kees Cooka5d23b92016-11-11 14:30:11 -0800434 prz = cxt->dprzs[cxt->dump_write_cnt];
Arve Hjønnevågc6289372012-12-11 17:49:24 -0800435
Aleksandr Yashkin45b0a5a2019-12-23 18:38:16 +0500436 /*
437 * Since this is a new crash dump, we need to reset the buffer in
438 * case it still has an old dump present. Without this, the new dump
439 * will get appended, which would seriously confuse anything trying
440 * to check dump file contents. Specifically, ramoops_read_kmsg_hdr()
441 * expects to find a dump header in the beginning of buffer data, so
442 * we must to reset the buffer values, in order to ensure that the
443 * header will be written to the beginning of the buffer.
444 */
445 persistent_ram_zap(prz);
446
Kees Cookb10b4712017-03-05 00:27:54 -0800447 /* Build header and append record contents. */
Kees Cookc7f3c5952017-05-19 15:29:10 -0700448 hlen = ramoops_write_kmsg_hdr(prz, record);
Kees Cookb10b4712017-03-05 00:27:54 -0800449 size = record->size;
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700450 if (size + hlen > prz->buffer_size)
451 size = prz->buffer_size - hlen;
Kees Cookb10b4712017-03-05 00:27:54 -0800452 persistent_ram_write(prz, record->buf, size);
Marco Stornelli56d611a2010-05-26 14:43:54 -0700453
Anton Vorontsovcac2eb72012-05-26 06:20:20 -0700454 cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt;
Kees Cook9ba80d92012-05-03 15:45:02 +1000455
456 return 0;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700457}
458
Kees Cook4c9ec212017-03-05 22:41:10 -0800459static int notrace ramoops_pstore_write_user(struct pstore_record *record,
460 const char __user *buf)
Mark Salyzyn5bf6d1b2016-09-01 08:13:46 -0700461{
Kees Cookfdd03112017-03-05 00:56:38 -0800462 if (record->type == PSTORE_TYPE_PMSG) {
463 struct ramoops_context *cxt = record->psi->data;
Mark Salyzyn5bf6d1b2016-09-01 08:13:46 -0700464
465 if (!cxt->mprz)
466 return -ENOMEM;
Kees Cookfdd03112017-03-05 00:56:38 -0800467 return persistent_ram_write_user(cxt->mprz, buf, record->size);
Mark Salyzyn5bf6d1b2016-09-01 08:13:46 -0700468 }
469
470 return -EINVAL;
471}
472
Kees Cooka61072a2017-03-04 23:31:19 -0800473static int ramoops_pstore_erase(struct pstore_record *record)
Kees Cook9ba80d92012-05-03 15:45:02 +1000474{
Kees Cooka61072a2017-03-04 23:31:19 -0800475 struct ramoops_context *cxt = record->psi->data;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700476 struct persistent_ram_zone *prz;
Kees Cook9ba80d92012-05-03 15:45:02 +1000477
Kees Cooka61072a2017-03-04 23:31:19 -0800478 switch (record->type) {
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700479 case PSTORE_TYPE_DMESG:
Kees Cooka61072a2017-03-04 23:31:19 -0800480 if (record->id >= cxt->max_dump_cnt)
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700481 return -EINVAL;
Kees Cooka61072a2017-03-04 23:31:19 -0800482 prz = cxt->dprzs[record->id];
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700483 break;
484 case PSTORE_TYPE_CONSOLE:
485 prz = cxt->cprz;
486 break;
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700487 case PSTORE_TYPE_FTRACE:
Kees Cooka61072a2017-03-04 23:31:19 -0800488 if (record->id >= cxt->max_ftrace_cnt)
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700489 return -EINVAL;
Kees Cooka61072a2017-03-04 23:31:19 -0800490 prz = cxt->fprzs[record->id];
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700491 break;
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800492 case PSTORE_TYPE_PMSG:
493 prz = cxt->mprz;
494 break;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700495 default:
Kees Cook9ba80d92012-05-03 15:45:02 +1000496 return -EINVAL;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700497 }
Kees Cook9ba80d92012-05-03 15:45:02 +1000498
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700499 persistent_ram_free_old(prz);
500 persistent_ram_zap(prz);
Kees Cook9ba80d92012-05-03 15:45:02 +1000501
502 return 0;
503}
504
505static struct ramoops_context oops_cxt = {
506 .pstore = {
507 .owner = THIS_MODULE,
508 .name = "ramoops",
509 .open = ramoops_pstore_open,
510 .read = ramoops_pstore_read,
Kees Cook4c9ec212017-03-05 22:41:10 -0800511 .write = ramoops_pstore_write,
512 .write_user = ramoops_pstore_write_user,
Kees Cook9ba80d92012-05-03 15:45:02 +1000513 .erase = ramoops_pstore_erase,
514 },
515};
516
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700517static void ramoops_free_przs(struct ramoops_context *cxt)
518{
519 int i;
520
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700521 /* Free dump PRZs */
Kees Cooka5d23b92016-11-11 14:30:11 -0800522 if (cxt->dprzs) {
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700523 for (i = 0; i < cxt->max_dump_cnt; i++)
Kees Cooka5d23b92016-11-11 14:30:11 -0800524 persistent_ram_free(cxt->dprzs[i]);
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700525
Kees Cooka5d23b92016-11-11 14:30:11 -0800526 kfree(cxt->dprzs);
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700527 cxt->max_dump_cnt = 0;
528 }
Sebastian Andrzej Siewior4407de72016-09-08 13:48:05 +0200529
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700530 /* Free ftrace PRZs */
531 if (cxt->fprzs) {
532 for (i = 0; i < cxt->max_ftrace_cnt; i++)
533 persistent_ram_free(cxt->fprzs[i]);
534 kfree(cxt->fprzs);
535 cxt->max_ftrace_cnt = 0;
536 }
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700537}
538
Kees Cookc443a5f2016-11-11 14:05:57 -0800539static int ramoops_init_przs(const char *name,
540 struct device *dev, struct ramoops_context *cxt,
Kees Cookde832092016-11-11 11:48:06 -0800541 struct persistent_ram_zone ***przs,
542 phys_addr_t *paddr, size_t mem_sz,
543 ssize_t record_size,
544 unsigned int *cnt, u32 sig, u32 flags)
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700545{
546 int err = -ENOMEM;
547 int i;
Kees Cookde832092016-11-11 11:48:06 -0800548 size_t zone_sz;
549 struct persistent_ram_zone **prz_ar;
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700550
Kees Cookde832092016-11-11 11:48:06 -0800551 /* Allocate nothing for 0 mem_sz or 0 record_size. */
552 if (mem_sz == 0 || record_size == 0) {
553 *cnt = 0;
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700554 return 0;
Arve Hjønnevågc6289372012-12-11 17:49:24 -0800555 }
556
Kees Cookde832092016-11-11 11:48:06 -0800557 /*
558 * If we have a negative record size, calculate it based on
559 * mem_sz / *cnt. If we have a positive record size, calculate
560 * cnt from mem_sz / record_size.
561 */
562 if (record_size < 0) {
563 if (*cnt == 0)
564 return 0;
565 record_size = mem_sz / *cnt;
Kees Cookc443a5f2016-11-11 14:05:57 -0800566 if (record_size == 0) {
567 dev_err(dev, "%s record size == 0 (%zu / %u)\n",
568 name, mem_sz, *cnt);
Kees Cookde832092016-11-11 11:48:06 -0800569 goto fail;
Kees Cookc443a5f2016-11-11 14:05:57 -0800570 }
Kees Cookde832092016-11-11 11:48:06 -0800571 } else {
572 *cnt = mem_sz / record_size;
Kees Cookc443a5f2016-11-11 14:05:57 -0800573 if (*cnt == 0) {
574 dev_err(dev, "%s record count == 0 (%zu / %zu)\n",
575 name, mem_sz, record_size);
Kees Cookde832092016-11-11 11:48:06 -0800576 goto fail;
Kees Cookc443a5f2016-11-11 14:05:57 -0800577 }
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700578 }
579
Kees Cookde832092016-11-11 11:48:06 -0800580 if (*paddr + mem_sz - cxt->phys_addr > cxt->size) {
Kees Cookc443a5f2016-11-11 14:05:57 -0800581 dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
582 name,
Kees Cookde832092016-11-11 11:48:06 -0800583 mem_sz, (unsigned long long)*paddr,
584 cxt->size, (unsigned long long)cxt->phys_addr);
585 goto fail;
586 }
587
588 zone_sz = mem_sz / *cnt;
Kees Cookc443a5f2016-11-11 14:05:57 -0800589 if (!zone_sz) {
590 dev_err(dev, "%s zone size == 0\n", name);
Kees Cookde832092016-11-11 11:48:06 -0800591 goto fail;
Kees Cookc443a5f2016-11-11 14:05:57 -0800592 }
Kees Cookde832092016-11-11 11:48:06 -0800593
594 prz_ar = kcalloc(*cnt, sizeof(**przs), GFP_KERNEL);
595 if (!prz_ar)
596 goto fail;
597
598 for (i = 0; i < *cnt; i++) {
599 prz_ar[i] = persistent_ram_new(*paddr, zone_sz, sig,
Tony Lindgren027bc8b2014-09-16 13:50:01 -0700600 &cxt->ecc_info,
Kees Cookde832092016-11-11 11:48:06 -0800601 cxt->memtype, flags);
602 if (IS_ERR(prz_ar[i])) {
603 err = PTR_ERR(prz_ar[i]);
Kees Cookc443a5f2016-11-11 14:05:57 -0800604 dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n",
605 name, record_size,
606 (unsigned long long)*paddr, err);
Sebastian Andrzej Siewior4407de72016-09-08 13:48:05 +0200607
608 while (i > 0) {
609 i--;
Kees Cookde832092016-11-11 11:48:06 -0800610 persistent_ram_free(prz_ar[i]);
Sebastian Andrzej Siewior4407de72016-09-08 13:48:05 +0200611 }
Kees Cookde832092016-11-11 11:48:06 -0800612 kfree(prz_ar);
613 goto fail;
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700614 }
Kees Cookde832092016-11-11 11:48:06 -0800615 *paddr += zone_sz;
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700616 }
617
Kees Cookde832092016-11-11 11:48:06 -0800618 *przs = prz_ar;
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700619 return 0;
Kees Cookde832092016-11-11 11:48:06 -0800620
621fail:
622 *cnt = 0;
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700623 return err;
624}
625
Kees Cookc443a5f2016-11-11 14:05:57 -0800626static int ramoops_init_prz(const char *name,
627 struct device *dev, struct ramoops_context *cxt,
Greg Kroah-Hartmanf568f6c2012-12-21 15:02:05 -0800628 struct persistent_ram_zone **prz,
629 phys_addr_t *paddr, size_t sz, u32 sig)
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700630{
631 if (!sz)
632 return 0;
633
Arve Hjønnevågc6289372012-12-11 17:49:24 -0800634 if (*paddr + sz - cxt->phys_addr > cxt->size) {
Kees Cookc443a5f2016-11-11 14:05:57 -0800635 dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
636 name, sz, (unsigned long long)*paddr,
Arve Hjønnevågc6289372012-12-11 17:49:24 -0800637 cxt->size, (unsigned long long)cxt->phys_addr);
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700638 return -ENOMEM;
Arve Hjønnevågc6289372012-12-11 17:49:24 -0800639 }
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700640
Joel Fernandes663deb42016-10-20 00:34:01 -0700641 *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info,
642 cxt->memtype, 0);
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700643 if (IS_ERR(*prz)) {
644 int err = PTR_ERR(*prz);
645
Kees Cookc443a5f2016-11-11 14:05:57 -0800646 dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n",
647 name, sz, (unsigned long long)*paddr, err);
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700648 return err;
649 }
650
651 persistent_ram_zap(*prz);
652
653 *paddr += sz;
654
655 return 0;
656}
657
Greg Hackmann35da6092016-01-07 15:40:56 -0800658static int ramoops_parse_dt_size(struct platform_device *pdev,
659 const char *propname, u32 *value)
660{
661 u32 val32 = 0;
662 int ret;
663
664 ret = of_property_read_u32(pdev->dev.of_node, propname, &val32);
665 if (ret < 0 && ret != -EINVAL) {
666 dev_err(&pdev->dev, "failed to parse property %s: %d\n",
667 propname, ret);
668 return ret;
669 }
670
671 if (val32 > INT_MAX) {
672 dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32);
673 return -EOVERFLOW;
674 }
675
676 *value = val32;
677 return 0;
678}
679
680static int ramoops_parse_dt(struct platform_device *pdev,
681 struct ramoops_platform_data *pdata)
682{
683 struct device_node *of_node = pdev->dev.of_node;
Kees Cook529182e2016-07-29 18:11:32 -0700684 struct resource *res;
Greg Hackmann35da6092016-01-07 15:40:56 -0800685 u32 value;
686 int ret;
687
688 dev_dbg(&pdev->dev, "using Device Tree\n");
689
Kees Cook529182e2016-07-29 18:11:32 -0700690 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
691 if (!res) {
Greg Hackmann35da6092016-01-07 15:40:56 -0800692 dev_err(&pdev->dev,
Kees Cook529182e2016-07-29 18:11:32 -0700693 "failed to locate DT /reserved-memory resource\n");
694 return -EINVAL;
Greg Hackmann35da6092016-01-07 15:40:56 -0800695 }
696
Kees Cook529182e2016-07-29 18:11:32 -0700697 pdata->mem_size = resource_size(res);
698 pdata->mem_address = res->start;
Greg Hackmann35da6092016-01-07 15:40:56 -0800699 pdata->mem_type = of_property_read_bool(of_node, "unbuffered");
700 pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops");
701
702#define parse_size(name, field) { \
703 ret = ramoops_parse_dt_size(pdev, name, &value); \
704 if (ret < 0) \
705 return ret; \
706 field = value; \
707 }
708
709 parse_size("record-size", pdata->record_size);
710 parse_size("console-size", pdata->console_size);
711 parse_size("ftrace-size", pdata->ftrace_size);
712 parse_size("pmsg-size", pdata->pmsg_size);
713 parse_size("ecc-size", pdata->ecc_info.ecc_size);
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700714 parse_size("flags", pdata->flags);
Greg Hackmann35da6092016-01-07 15:40:56 -0800715
716#undef parse_size
717
718 return 0;
719}
720
Greg Kroah-Hartmanf568f6c2012-12-21 15:02:05 -0800721static int ramoops_probe(struct platform_device *pdev)
Marco Stornelli56d611a2010-05-26 14:43:54 -0700722{
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700723 struct device *dev = &pdev->dev;
Greg Hackmann35da6092016-01-07 15:40:56 -0800724 struct ramoops_platform_data *pdata = dev->platform_data;
Kees Cook96188b12019-01-20 14:33:34 -0800725 struct ramoops_platform_data pdata_local;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700726 struct ramoops_context *cxt = &oops_cxt;
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700727 size_t dump_mem_sz;
728 phys_addr_t paddr;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700729 int err = -EINVAL;
730
Greg Hackmann35da6092016-01-07 15:40:56 -0800731 if (dev_of_node(dev) && !pdata) {
Kees Cook96188b12019-01-20 14:33:34 -0800732 pdata = &pdata_local;
733 memset(pdata, 0, sizeof(*pdata));
Greg Hackmann35da6092016-01-07 15:40:56 -0800734
735 err = ramoops_parse_dt(pdev, pdata);
736 if (err < 0)
737 goto fail_out;
738 }
739
Kees Cookfc46d4e2016-11-15 16:29:40 -0800740 /*
741 * Only a single ramoops area allowed at a time, so fail extra
Kees Cook9ba80d92012-05-03 15:45:02 +1000742 * probes.
743 */
Kees Cookfc46d4e2016-11-15 16:29:40 -0800744 if (cxt->max_dump_cnt) {
745 pr_err("already initialized\n");
Kees Cook9ba80d92012-05-03 15:45:02 +1000746 goto fail_out;
Kees Cookfc46d4e2016-11-15 16:29:40 -0800747 }
748
749 /* Make sure we didn't get bogus platform data pointer. */
750 if (!pdata) {
751 pr_err("NULL platform data\n");
752 goto fail_out;
753 }
Kees Cook9ba80d92012-05-03 15:45:02 +1000754
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700755 if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size &&
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800756 !pdata->ftrace_size && !pdata->pmsg_size)) {
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700757 pr_err("The memory size and the record/console size must be "
Sergiu Iordache3e5c4fa2011-07-26 16:08:59 -0700758 "non-zero\n");
Kees Cook9ba80d92012-05-03 15:45:02 +1000759 goto fail_out;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700760 }
761
Maxime Bizon3bd11cf2013-08-30 18:06:41 +0200762 if (pdata->record_size && !is_power_of_2(pdata->record_size))
Maxime Bizonb042e472012-10-22 11:19:28 +0200763 pdata->record_size = rounddown_pow_of_two(pdata->record_size);
Maxime Bizon3bd11cf2013-08-30 18:06:41 +0200764 if (pdata->console_size && !is_power_of_2(pdata->console_size))
Maxime Bizonb042e472012-10-22 11:19:28 +0200765 pdata->console_size = rounddown_pow_of_two(pdata->console_size);
Maxime Bizon3bd11cf2013-08-30 18:06:41 +0200766 if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size))
Maxime Bizonb042e472012-10-22 11:19:28 +0200767 pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size);
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800768 if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size))
769 pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size);
Marco Stornelli56d611a2010-05-26 14:43:54 -0700770
Marco Stornelli13aefd72011-07-26 16:08:57 -0700771 cxt->size = pdata->mem_size;
772 cxt->phys_addr = pdata->mem_address;
Tony Lindgren027bc8b2014-09-16 13:50:01 -0700773 cxt->memtype = pdata->mem_type;
Sergiu Iordache3e5c4fa2011-07-26 16:08:59 -0700774 cxt->record_size = pdata->record_size;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700775 cxt->console_size = pdata->console_size;
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700776 cxt->ftrace_size = pdata->ftrace_size;
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800777 cxt->pmsg_size = pdata->pmsg_size;
Sergiu Iordache6b4d2a22011-07-26 16:08:58 -0700778 cxt->dump_oops = pdata->dump_oops;
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700779 cxt->flags = pdata->flags;
Arve Hjønnevågc31ad082012-05-22 16:33:23 -0700780 cxt->ecc_info = pdata->ecc_info;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700781
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700782 paddr = cxt->phys_addr;
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700783
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800784 dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size
785 - cxt->pmsg_size;
Kees Cooka5d23b92016-11-11 14:30:11 -0800786 err = ramoops_init_przs("dump", dev, cxt, &cxt->dprzs, &paddr,
Kees Cookc443a5f2016-11-11 14:05:57 -0800787 dump_mem_sz, cxt->record_size,
788 &cxt->max_dump_cnt, 0, 0);
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700789 if (err)
790 goto fail_out;
791
Kees Cookc443a5f2016-11-11 14:05:57 -0800792 err = ramoops_init_prz("console", dev, cxt, &cxt->cprz, &paddr,
Anton Vorontsovcbe7cbf2012-07-17 12:11:12 -0700793 cxt->console_size, 0);
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700794 if (err)
795 goto fail_init_cprz;
796
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700797 cxt->max_ftrace_cnt = (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
798 ? nr_cpu_ids
799 : 1;
Kees Cookc443a5f2016-11-11 14:05:57 -0800800 err = ramoops_init_przs("ftrace", dev, cxt, &cxt->fprzs, &paddr,
801 cxt->ftrace_size, -1,
802 &cxt->max_ftrace_cnt, LINUX_VERSION_CODE,
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700803 (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
804 ? PRZ_FLAG_NO_LOCK : 0);
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700805 if (err)
806 goto fail_init_fprz;
807
Kees Cookc443a5f2016-11-11 14:05:57 -0800808 err = ramoops_init_prz("pmsg", dev, cxt, &cxt->mprz, &paddr,
809 cxt->pmsg_size, 0);
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800810 if (err)
811 goto fail_init_mprz;
812
Kees Cook9ba80d92012-05-03 15:45:02 +1000813 cxt->pstore.data = cxt;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700814 /*
Kees Cook08ae2e82019-05-30 23:37:29 -0700815 * Prepare frontend flags based on which areas are initialized.
816 * For ramoops_init_przs() cases, the "max count" variable tells
817 * if there are regions present. For ramoops_init_prz() cases,
818 * the single region size is how to check.
819 */
820 cxt->pstore.flags = 0;
821 if (cxt->max_dump_cnt)
822 cxt->pstore.flags |= PSTORE_FLAGS_DMESG;
823 if (cxt->console_size)
824 cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE;
825 if (cxt->max_ftrace_cnt)
826 cxt->pstore.flags |= PSTORE_FLAGS_FTRACE;
827 if (cxt->pmsg_size)
828 cxt->pstore.flags |= PSTORE_FLAGS_PMSG;
829
830 /*
Kees Cookb718d6b2018-11-01 16:17:22 -0700831 * Since bufsize is only used for dmesg crash dumps, it
832 * must match the size of the dprz record (after PRZ header
833 * and ECC bytes have been accounted for).
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700834 */
Kees Cook08ae2e82019-05-30 23:37:29 -0700835 if (cxt->pstore.flags & PSTORE_FLAGS_DMESG) {
836 cxt->pstore.bufsize = cxt->dprzs[0]->buffer_size;
837 cxt->pstore.buf = kzalloc(cxt->pstore.bufsize, GFP_KERNEL);
838 if (!cxt->pstore.buf) {
839 pr_err("cannot allocate pstore crash dump buffer\n");
840 err = -ENOMEM;
841 goto fail_clear;
842 }
Kees Cook9ba80d92012-05-03 15:45:02 +1000843 }
844
Kees Cook9ba80d92012-05-03 15:45:02 +1000845 err = pstore_register(&cxt->pstore);
Marco Stornelli56d611a2010-05-26 14:43:54 -0700846 if (err) {
Kees Cook9ba80d92012-05-03 15:45:02 +1000847 pr_err("registering with pstore failed\n");
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700848 goto fail_buf;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700849 }
850
Kees Cookc7552012012-01-12 17:20:59 -0800851 /*
852 * Update the module parameter variables as well so they are visible
853 * through /sys/module/ramoops/parameters/
854 */
855 mem_size = pdata->mem_size;
856 mem_address = pdata->mem_address;
857 record_size = pdata->record_size;
858 dump_oops = pdata->dump_oops;
Wang Long62f269e2015-03-09 07:39:07 +0000859 ramoops_console_size = pdata->console_size;
860 ramoops_pmsg_size = pdata->pmsg_size;
861 ramoops_ftrace_size = pdata->ftrace_size;
Kees Cookc7552012012-01-12 17:20:59 -0800862
Arve Hjønnevågc31ad082012-05-22 16:33:23 -0700863 pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n",
Randy Dunlapd109a672012-05-03 15:45:03 +1000864 cxt->size, (unsigned long long)cxt->phys_addr,
Arve Hjønnevågc31ad082012-05-22 16:33:23 -0700865 cxt->ecc_info.ecc_size, cxt->ecc_info.block_size);
Kees Cook9ba80d92012-05-03 15:45:02 +1000866
Marco Stornelli56d611a2010-05-26 14:43:54 -0700867 return 0;
868
Kees Cook9ba80d92012-05-03 15:45:02 +1000869fail_buf:
870 kfree(cxt->pstore.buf);
871fail_clear:
872 cxt->pstore.bufsize = 0;
Hiraku Toyookae976e562016-07-25 12:56:55 +0900873 persistent_ram_free(cxt->mprz);
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800874fail_init_mprz:
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700875fail_init_fprz:
Hiraku Toyookae976e562016-07-25 12:56:55 +0900876 persistent_ram_free(cxt->cprz);
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700877fail_init_cprz:
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700878 ramoops_free_przs(cxt);
Kees Cook9ba80d92012-05-03 15:45:02 +1000879fail_out:
Marco Stornelli56d611a2010-05-26 14:43:54 -0700880 return err;
881}
882
Geliang Tangee1d2672015-10-20 00:39:03 -0700883static int ramoops_remove(struct platform_device *pdev)
Marco Stornelli56d611a2010-05-26 14:43:54 -0700884{
885 struct ramoops_context *cxt = &oops_cxt;
886
Geliang Tangee1d2672015-10-20 00:39:03 -0700887 pstore_unregister(&cxt->pstore);
Kees Cook9ba80d92012-05-03 15:45:02 +1000888
Kees Cook9ba80d92012-05-03 15:45:02 +1000889 kfree(cxt->pstore.buf);
890 cxt->pstore.bufsize = 0;
891
Geliang Tangee1d2672015-10-20 00:39:03 -0700892 persistent_ram_free(cxt->mprz);
Geliang Tangee1d2672015-10-20 00:39:03 -0700893 persistent_ram_free(cxt->cprz);
894 ramoops_free_przs(cxt);
895
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700896 return 0;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700897}
898
Greg Hackmann35da6092016-01-07 15:40:56 -0800899static const struct of_device_id dt_match[] = {
900 { .compatible = "ramoops" },
901 {}
902};
903
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700904static struct platform_driver ramoops_driver = {
Anton Vorontsov924d3712012-06-18 19:15:50 -0700905 .probe = ramoops_probe,
Geliang Tangee1d2672015-10-20 00:39:03 -0700906 .remove = ramoops_remove,
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700907 .driver = {
Greg Hackmann35da6092016-01-07 15:40:56 -0800908 .name = "ramoops",
909 .of_match_table = dt_match,
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700910 },
911};
912
Anton Vorontsov924d3712012-06-18 19:15:50 -0700913static void ramoops_register_dummy(void)
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700914{
Anton Vorontsov924d3712012-06-18 19:15:50 -0700915 if (!mem_size)
916 return;
Marco Stornelli13aefd72011-07-26 16:08:57 -0700917
Anton Vorontsov924d3712012-06-18 19:15:50 -0700918 pr_info("using module parameters\n");
919
920 dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL);
921 if (!dummy_data) {
922 pr_info("could not allocate pdata\n");
923 return;
Marco Stornelli13aefd72011-07-26 16:08:57 -0700924 }
925
Anton Vorontsov924d3712012-06-18 19:15:50 -0700926 dummy_data->mem_size = mem_size;
927 dummy_data->mem_address = mem_address;
Wang Long07855052015-05-21 09:52:29 -0700928 dummy_data->mem_type = mem_type;
Anton Vorontsov924d3712012-06-18 19:15:50 -0700929 dummy_data->record_size = record_size;
930 dummy_data->console_size = ramoops_console_size;
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700931 dummy_data->ftrace_size = ramoops_ftrace_size;
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800932 dummy_data->pmsg_size = ramoops_pmsg_size;
Anton Vorontsov924d3712012-06-18 19:15:50 -0700933 dummy_data->dump_oops = dump_oops;
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700934 dummy_data->flags = RAMOOPS_FLAG_FTRACE_PER_CPU;
935
Anton Vorontsov5ca5d4e2012-07-09 17:03:19 -0700936 /*
937 * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC
938 * (using 1 byte for ECC isn't much of use anyway).
939 */
Arve Hjønnevågc31ad082012-05-22 16:33:23 -0700940 dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc;
Anton Vorontsov924d3712012-06-18 19:15:50 -0700941
942 dummy = platform_device_register_data(NULL, "ramoops", -1,
943 dummy_data, sizeof(struct ramoops_platform_data));
944 if (IS_ERR(dummy)) {
945 pr_info("could not create platform device: %ld\n",
946 PTR_ERR(dummy));
947 }
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700948}
949
Anton Vorontsov924d3712012-06-18 19:15:50 -0700950static int __init ramoops_init(void)
951{
952 ramoops_register_dummy();
953 return platform_driver_register(&ramoops_driver);
954}
955postcore_initcall(ramoops_init);
956
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700957static void __exit ramoops_exit(void)
958{
959 platform_driver_unregister(&ramoops_driver);
Jovi Zhangb4a871b2012-08-20 14:58:26 +0800960 platform_device_unregister(dummy);
Marco Stornelli13aefd72011-07-26 16:08:57 -0700961 kfree(dummy_data);
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700962}
Marco Stornelli56d611a2010-05-26 14:43:54 -0700963module_exit(ramoops_exit);
964
965MODULE_LICENSE("GPL");
966MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>");
967MODULE_DESCRIPTION("RAM Oops/Panic logger/driver");