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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/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 Lindgren027bc8b02014-09-16 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 Lindgren027bc8b02014-09-16 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
Kees Cook7aaa8222018-05-14 15:50:52 -0700156static int ramoops_read_kmsg_hdr(char *buffer, struct timespec64 *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
Arnd Bergmanne264abea2018-05-30 17:24:52 +0200162 if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu-%c\n%n",
163 (time64_t *)&time->tv_sec, &time->tv_nsec, &data_type,
Kees Cook7aaa8222018-05-14 15:50:52 -0700164 &header_length) == 3) {
Aruna Balakrishnaiah3f8f80f2013-08-16 13:58:00 -0700165 if (data_type == 'C')
166 *compressed = true;
167 else
168 *compressed = false;
Arnd Bergmanne264abea2018-05-30 17:24:52 +0200169 } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu\n%n",
170 (time64_t *)&time->tv_sec, &time->tv_nsec,
Kees Cook7aaa8222018-05-14 15:50:52 -0700171 &header_length) == 2) {
172 *compressed = false;
Aruna Balakrishnaiah3f8f80f2013-08-16 13:58:00 -0700173 } else {
174 time->tv_sec = 0;
175 time->tv_nsec = 0;
176 *compressed = false;
177 }
Ben Zhanga28726b2014-10-30 17:14:21 -0700178 return header_length;
Aruna Balakrishnaiah3f8f80f2013-08-16 13:58:00 -0700179}
180
Mark Salyzynf44f9652015-01-13 14:32:50 -0800181static bool prz_ok(struct persistent_ram_zone *prz)
182{
183 return !!prz && !!(persistent_ram_old_size(prz) +
184 persistent_ram_ecc_string(prz, NULL, 0));
185}
186
Joel Fernandes2fbea822016-10-20 00:34:06 -0700187static ssize_t ftrace_log_combine(struct persistent_ram_zone *dest,
188 struct persistent_ram_zone *src)
189{
190 size_t dest_size, src_size, total, dest_off, src_off;
191 size_t dest_idx = 0, src_idx = 0, merged_idx = 0;
192 void *merged_buf;
193 struct pstore_ftrace_record *drec, *srec, *mrec;
194 size_t record_size = sizeof(struct pstore_ftrace_record);
195
196 dest_off = dest->old_log_size % record_size;
197 dest_size = dest->old_log_size - dest_off;
198
199 src_off = src->old_log_size % record_size;
200 src_size = src->old_log_size - src_off;
201
202 total = dest_size + src_size;
203 merged_buf = kmalloc(total, GFP_KERNEL);
204 if (!merged_buf)
205 return -ENOMEM;
206
207 drec = (struct pstore_ftrace_record *)(dest->old_log + dest_off);
208 srec = (struct pstore_ftrace_record *)(src->old_log + src_off);
209 mrec = (struct pstore_ftrace_record *)(merged_buf);
210
211 while (dest_size > 0 && src_size > 0) {
212 if (pstore_ftrace_read_timestamp(&drec[dest_idx]) <
213 pstore_ftrace_read_timestamp(&srec[src_idx])) {
214 mrec[merged_idx++] = drec[dest_idx++];
215 dest_size -= record_size;
216 } else {
217 mrec[merged_idx++] = srec[src_idx++];
218 src_size -= record_size;
219 }
220 }
221
222 while (dest_size > 0) {
223 mrec[merged_idx++] = drec[dest_idx++];
224 dest_size -= record_size;
225 }
226
227 while (src_size > 0) {
228 mrec[merged_idx++] = srec[src_idx++];
229 src_size -= record_size;
230 }
231
232 kfree(dest->old_log);
233 dest->old_log = merged_buf;
234 dest->old_log_size = total;
235
236 return 0;
237}
238
Kees Cook125cc422017-03-03 22:09:18 -0800239static ssize_t ramoops_pstore_read(struct pstore_record *record)
Kees Cook9ba80d92012-05-03 15:45:02 +1000240{
Joel Fernandes2fbea822016-10-20 00:34:06 -0700241 ssize_t size = 0;
Kees Cook125cc422017-03-03 22:09:18 -0800242 struct ramoops_context *cxt = record->psi->data;
Ben Zhange036bd32015-05-21 09:50:34 -0700243 struct persistent_ram_zone *prz = NULL;
244 int header_length = 0;
Joel Fernandes2fbea822016-10-20 00:34:06 -0700245 bool free_prz = false;
Kees Cook9ba80d92012-05-03 15:45:02 +1000246
Kees Cook125cc422017-03-03 22:09:18 -0800247 /*
248 * Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but
Ben Zhange036bd32015-05-21 09:50:34 -0700249 * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have
250 * valid time stamps, so it is initialized to zero.
251 */
Kees Cook125cc422017-03-03 22:09:18 -0800252 record->time.tv_sec = 0;
253 record->time.tv_nsec = 0;
254 record->compressed = false;
Ben Zhange036bd32015-05-21 09:50:34 -0700255
256 /* Find the next valid persistent_ram_zone for DMESG */
257 while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) {
Kees Cooka5d23b92016-11-11 14:30:11 -0800258 prz = ramoops_get_next_prz(cxt->dprzs, &cxt->dump_read_cnt,
Kees Cook125cc422017-03-03 22:09:18 -0800259 cxt->max_dump_cnt, &record->id,
260 &record->type,
Ben Zhange036bd32015-05-21 09:50:34 -0700261 PSTORE_TYPE_DMESG, 1);
262 if (!prz_ok(prz))
263 continue;
264 header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz),
Kees Cook125cc422017-03-03 22:09:18 -0800265 &record->time,
266 &record->compressed);
Ben Zhange036bd32015-05-21 09:50:34 -0700267 /* Clear and skip this DMESG record if it has no valid header */
268 if (!header_length) {
269 persistent_ram_free_old(prz);
270 persistent_ram_zap(prz);
271 prz = NULL;
272 }
273 }
274
Mark Salyzynf44f9652015-01-13 14:32:50 -0800275 if (!prz_ok(prz))
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700276 prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt,
Kees Cook125cc422017-03-03 22:09:18 -0800277 1, &record->id, &record->type,
278 PSTORE_TYPE_CONSOLE, 0);
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700279
Mark Salyzynf44f9652015-01-13 14:32:50 -0800280 if (!prz_ok(prz))
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800281 prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt,
Kees Cook125cc422017-03-03 22:09:18 -0800282 1, &record->id, &record->type,
283 PSTORE_TYPE_PMSG, 0);
Joel Fernandes2fbea822016-10-20 00:34:06 -0700284
285 /* ftrace is last since it may want to dynamically allocate memory. */
Kees Cook46418412017-02-10 10:15:34 -0800286 if (!prz_ok(prz)) {
Joel Fernandes2fbea822016-10-20 00:34:06 -0700287 if (!(cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)) {
288 prz = ramoops_get_next_prz(cxt->fprzs,
Kees Cook125cc422017-03-03 22:09:18 -0800289 &cxt->ftrace_read_cnt, 1, &record->id,
290 &record->type, PSTORE_TYPE_FTRACE, 0);
Joel Fernandes2fbea822016-10-20 00:34:06 -0700291 } else {
292 /*
293 * Build a new dummy record which combines all the
294 * per-cpu records including metadata and ecc info.
295 */
296 struct persistent_ram_zone *tmp_prz, *prz_next;
297
298 tmp_prz = kzalloc(sizeof(struct persistent_ram_zone),
299 GFP_KERNEL);
300 if (!tmp_prz)
301 return -ENOMEM;
302 free_prz = true;
303
304 while (cxt->ftrace_read_cnt < cxt->max_ftrace_cnt) {
305 prz_next = ramoops_get_next_prz(cxt->fprzs,
306 &cxt->ftrace_read_cnt,
Kees Cook125cc422017-03-03 22:09:18 -0800307 cxt->max_ftrace_cnt,
308 &record->id,
309 &record->type,
310 PSTORE_TYPE_FTRACE, 0);
Joel Fernandes2fbea822016-10-20 00:34:06 -0700311
312 if (!prz_ok(prz_next))
313 continue;
314
315 tmp_prz->ecc_info = prz_next->ecc_info;
316 tmp_prz->corrected_bytes +=
317 prz_next->corrected_bytes;
318 tmp_prz->bad_blocks += prz_next->bad_blocks;
319 size = ftrace_log_combine(tmp_prz, prz_next);
320 if (size)
321 goto out;
322 }
Kees Cook125cc422017-03-03 22:09:18 -0800323 record->id = 0;
Joel Fernandes2fbea822016-10-20 00:34:06 -0700324 prz = tmp_prz;
325 }
326 }
327
328 if (!prz_ok(prz)) {
329 size = 0;
330 goto out;
331 }
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700332
Ben Zhange036bd32015-05-21 09:50:34 -0700333 size = persistent_ram_old_size(prz) - header_length;
Arve Hjønnevågbd08ec32012-12-05 21:19:51 -0800334
335 /* ECC correction notice */
Kees Cook125cc422017-03-03 22:09:18 -0800336 record->ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
Arve Hjønnevågbd08ec32012-12-05 21:19:51 -0800337
Kees Cook125cc422017-03-03 22:09:18 -0800338 record->buf = kmalloc(size + record->ecc_notice_size + 1, GFP_KERNEL);
339 if (record->buf == NULL) {
Joel Fernandes2fbea822016-10-20 00:34:06 -0700340 size = -ENOMEM;
341 goto out;
342 }
Kees Cook9ba80d92012-05-03 15:45:02 +1000343
Kees Cook125cc422017-03-03 22:09:18 -0800344 memcpy(record->buf, (char *)persistent_ram_old(prz) + header_length,
345 size);
Joel Fernandes2fbea822016-10-20 00:34:06 -0700346
Kees Cook125cc422017-03-03 22:09:18 -0800347 persistent_ram_ecc_string(prz, record->buf + size,
348 record->ecc_notice_size + 1);
Arve Hjønnevågbd08ec32012-12-05 21:19:51 -0800349
Joel Fernandes2fbea822016-10-20 00:34:06 -0700350out:
351 if (free_prz) {
352 kfree(prz->old_log);
353 kfree(prz);
354 }
355
Geliang Tang8cfc8dd2016-02-18 22:04:22 +0800356 return size;
Kees Cook9ba80d92012-05-03 15:45:02 +1000357}
358
Aruna Balakrishnaiah3f8f80f2013-08-16 13:58:00 -0700359static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,
Kees Cookc7f3c5952017-05-19 15:29:10 -0700360 struct pstore_record *record)
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700361{
362 char *hdr;
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700363 size_t len;
364
Arnd Bergmanne264abea2018-05-30 17:24:52 +0200365 hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lld.%06lu-%c\n",
366 (time64_t)record->time.tv_sec,
Kees Cookc7f3c5952017-05-19 15:29:10 -0700367 record->time.tv_nsec / 1000,
368 record->compressed ? 'C' : 'D');
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700369 WARN_ON_ONCE(!hdr);
370 len = hdr ? strlen(hdr) : 0;
371 persistent_ram_write(prz, hdr, len);
372 kfree(hdr);
373
374 return len;
375}
376
Kees Cook4c9ec212017-03-05 22:41:10 -0800377static int notrace ramoops_pstore_write(struct pstore_record *record)
Kees Cook9ba80d92012-05-03 15:45:02 +1000378{
Kees Cookb10b4712017-03-05 00:27:54 -0800379 struct ramoops_context *cxt = record->psi->data;
Arve Hjønnevågc6289372012-12-11 17:49:24 -0800380 struct persistent_ram_zone *prz;
Kees Cookb10b4712017-03-05 00:27:54 -0800381 size_t size, hlen;
Kees Cook9ba80d92012-05-03 15:45:02 +1000382
Kees Cookb10b4712017-03-05 00:27:54 -0800383 if (record->type == PSTORE_TYPE_CONSOLE) {
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700384 if (!cxt->cprz)
385 return -ENOMEM;
Kees Cookb10b4712017-03-05 00:27:54 -0800386 persistent_ram_write(cxt->cprz, record->buf, record->size);
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700387 return 0;
Kees Cookb10b4712017-03-05 00:27:54 -0800388 } else if (record->type == PSTORE_TYPE_FTRACE) {
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700389 int zonenum;
390
391 if (!cxt->fprzs)
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700392 return -ENOMEM;
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700393 /*
394 * Choose zone by if we're using per-cpu buffers.
395 */
396 if (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
397 zonenum = smp_processor_id();
398 else
399 zonenum = 0;
400
Kees Cookb10b4712017-03-05 00:27:54 -0800401 persistent_ram_write(cxt->fprzs[zonenum], record->buf,
402 record->size);
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700403 return 0;
Kees Cookb10b4712017-03-05 00:27:54 -0800404 } else if (record->type == PSTORE_TYPE_PMSG) {
Joel Fernandesd8991f52016-10-20 00:34:02 -0700405 pr_warn_ratelimited("PMSG shouldn't call %s\n", __func__);
406 return -EINVAL;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700407 }
408
Kees Cookb10b4712017-03-05 00:27:54 -0800409 if (record->type != PSTORE_TYPE_DMESG)
Kees Cook9ba80d92012-05-03 15:45:02 +1000410 return -EINVAL;
411
Kees Cookb10b4712017-03-05 00:27:54 -0800412 /*
413 * Out of the various dmesg dump types, ramoops is currently designed
Kees Cook9ba80d92012-05-03 15:45:02 +1000414 * to only store crash logs, rather than storing general kernel logs.
415 */
Kees Cookb10b4712017-03-05 00:27:54 -0800416 if (record->reason != KMSG_DUMP_OOPS &&
417 record->reason != KMSG_DUMP_PANIC)
Kees Cook9ba80d92012-05-03 15:45:02 +1000418 return -EINVAL;
Seiji Aguchifc2d5572011-01-12 16:59:29 -0800419
Kees Cook9ba80d92012-05-03 15:45:02 +1000420 /* Skip Oopes when configured to do so. */
Kees Cookb10b4712017-03-05 00:27:54 -0800421 if (record->reason == KMSG_DUMP_OOPS && !cxt->dump_oops)
Kees Cook9ba80d92012-05-03 15:45:02 +1000422 return -EINVAL;
423
Kees Cookb10b4712017-03-05 00:27:54 -0800424 /*
425 * Explicitly only take the first part of any new crash.
Kees Cook9ba80d92012-05-03 15:45:02 +1000426 * If our buffer is larger than kmsg_bytes, this can never happen,
427 * and if our buffer is smaller than kmsg_bytes, we don't want the
428 * report split across multiple records.
429 */
Kees Cookb10b4712017-03-05 00:27:54 -0800430 if (record->part != 1)
Kees Cook9ba80d92012-05-03 15:45:02 +1000431 return -ENOSPC;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700432
Kees Cooka5d23b92016-11-11 14:30:11 -0800433 if (!cxt->dprzs)
Arve Hjønnevågc6289372012-12-11 17:49:24 -0800434 return -ENOSPC;
435
Kees Cooka5d23b92016-11-11 14:30:11 -0800436 prz = cxt->dprzs[cxt->dump_write_cnt];
Arve Hjønnevågc6289372012-12-11 17:49:24 -0800437
Kees Cookb10b4712017-03-05 00:27:54 -0800438 /* Build header and append record contents. */
Kees Cookc7f3c5952017-05-19 15:29:10 -0700439 hlen = ramoops_write_kmsg_hdr(prz, record);
Kees Cookb10b4712017-03-05 00:27:54 -0800440 size = record->size;
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700441 if (size + hlen > prz->buffer_size)
442 size = prz->buffer_size - hlen;
Kees Cookb10b4712017-03-05 00:27:54 -0800443 persistent_ram_write(prz, record->buf, size);
Marco Stornelli56d611a2010-05-26 14:43:54 -0700444
Anton Vorontsovcac2eb72012-05-26 06:20:20 -0700445 cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt;
Kees Cook9ba80d92012-05-03 15:45:02 +1000446
447 return 0;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700448}
449
Kees Cook4c9ec212017-03-05 22:41:10 -0800450static int notrace ramoops_pstore_write_user(struct pstore_record *record,
451 const char __user *buf)
Mark Salyzyn5bf6d1b2016-09-01 08:13:46 -0700452{
Kees Cookfdd03112017-03-05 00:56:38 -0800453 if (record->type == PSTORE_TYPE_PMSG) {
454 struct ramoops_context *cxt = record->psi->data;
Mark Salyzyn5bf6d1b2016-09-01 08:13:46 -0700455
456 if (!cxt->mprz)
457 return -ENOMEM;
Kees Cookfdd03112017-03-05 00:56:38 -0800458 return persistent_ram_write_user(cxt->mprz, buf, record->size);
Mark Salyzyn5bf6d1b2016-09-01 08:13:46 -0700459 }
460
461 return -EINVAL;
462}
463
Kees Cooka61072a2017-03-04 23:31:19 -0800464static int ramoops_pstore_erase(struct pstore_record *record)
Kees Cook9ba80d92012-05-03 15:45:02 +1000465{
Kees Cooka61072a2017-03-04 23:31:19 -0800466 struct ramoops_context *cxt = record->psi->data;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700467 struct persistent_ram_zone *prz;
Kees Cook9ba80d92012-05-03 15:45:02 +1000468
Kees Cooka61072a2017-03-04 23:31:19 -0800469 switch (record->type) {
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700470 case PSTORE_TYPE_DMESG:
Kees Cooka61072a2017-03-04 23:31:19 -0800471 if (record->id >= cxt->max_dump_cnt)
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700472 return -EINVAL;
Kees Cooka61072a2017-03-04 23:31:19 -0800473 prz = cxt->dprzs[record->id];
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700474 break;
475 case PSTORE_TYPE_CONSOLE:
476 prz = cxt->cprz;
477 break;
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700478 case PSTORE_TYPE_FTRACE:
Kees Cooka61072a2017-03-04 23:31:19 -0800479 if (record->id >= cxt->max_ftrace_cnt)
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700480 return -EINVAL;
Kees Cooka61072a2017-03-04 23:31:19 -0800481 prz = cxt->fprzs[record->id];
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700482 break;
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800483 case PSTORE_TYPE_PMSG:
484 prz = cxt->mprz;
485 break;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700486 default:
Kees Cook9ba80d92012-05-03 15:45:02 +1000487 return -EINVAL;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700488 }
Kees Cook9ba80d92012-05-03 15:45:02 +1000489
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700490 persistent_ram_free_old(prz);
491 persistent_ram_zap(prz);
Kees Cook9ba80d92012-05-03 15:45:02 +1000492
493 return 0;
494}
495
496static struct ramoops_context oops_cxt = {
497 .pstore = {
498 .owner = THIS_MODULE,
499 .name = "ramoops",
500 .open = ramoops_pstore_open,
501 .read = ramoops_pstore_read,
Kees Cook4c9ec212017-03-05 22:41:10 -0800502 .write = ramoops_pstore_write,
503 .write_user = ramoops_pstore_write_user,
Kees Cook9ba80d92012-05-03 15:45:02 +1000504 .erase = ramoops_pstore_erase,
505 },
506};
507
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700508static void ramoops_free_przs(struct ramoops_context *cxt)
509{
510 int i;
511
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700512 /* Free dump PRZs */
Kees Cooka5d23b92016-11-11 14:30:11 -0800513 if (cxt->dprzs) {
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700514 for (i = 0; i < cxt->max_dump_cnt; i++)
Kees Cooka5d23b92016-11-11 14:30:11 -0800515 persistent_ram_free(cxt->dprzs[i]);
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700516
Kees Cooka5d23b92016-11-11 14:30:11 -0800517 kfree(cxt->dprzs);
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700518 cxt->max_dump_cnt = 0;
519 }
Sebastian Andrzej Siewior4407de72016-09-08 13:48:05 +0200520
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700521 /* Free ftrace PRZs */
522 if (cxt->fprzs) {
523 for (i = 0; i < cxt->max_ftrace_cnt; i++)
524 persistent_ram_free(cxt->fprzs[i]);
525 kfree(cxt->fprzs);
526 cxt->max_ftrace_cnt = 0;
527 }
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700528}
529
Kees Cookc443a5f2016-11-11 14:05:57 -0800530static int ramoops_init_przs(const char *name,
531 struct device *dev, struct ramoops_context *cxt,
Kees Cookde832092016-11-11 11:48:06 -0800532 struct persistent_ram_zone ***przs,
533 phys_addr_t *paddr, size_t mem_sz,
534 ssize_t record_size,
535 unsigned int *cnt, u32 sig, u32 flags)
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700536{
537 int err = -ENOMEM;
538 int i;
Kees Cookde832092016-11-11 11:48:06 -0800539 size_t zone_sz;
540 struct persistent_ram_zone **prz_ar;
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700541
Kees Cookde832092016-11-11 11:48:06 -0800542 /* Allocate nothing for 0 mem_sz or 0 record_size. */
543 if (mem_sz == 0 || record_size == 0) {
544 *cnt = 0;
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700545 return 0;
Arve Hjønnevågc6289372012-12-11 17:49:24 -0800546 }
547
Kees Cookde832092016-11-11 11:48:06 -0800548 /*
549 * If we have a negative record size, calculate it based on
550 * mem_sz / *cnt. If we have a positive record size, calculate
551 * cnt from mem_sz / record_size.
552 */
553 if (record_size < 0) {
554 if (*cnt == 0)
555 return 0;
556 record_size = mem_sz / *cnt;
Kees Cookc443a5f2016-11-11 14:05:57 -0800557 if (record_size == 0) {
558 dev_err(dev, "%s record size == 0 (%zu / %u)\n",
559 name, mem_sz, *cnt);
Kees Cookde832092016-11-11 11:48:06 -0800560 goto fail;
Kees Cookc443a5f2016-11-11 14:05:57 -0800561 }
Kees Cookde832092016-11-11 11:48:06 -0800562 } else {
563 *cnt = mem_sz / record_size;
Kees Cookc443a5f2016-11-11 14:05:57 -0800564 if (*cnt == 0) {
565 dev_err(dev, "%s record count == 0 (%zu / %zu)\n",
566 name, mem_sz, record_size);
Kees Cookde832092016-11-11 11:48:06 -0800567 goto fail;
Kees Cookc443a5f2016-11-11 14:05:57 -0800568 }
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700569 }
570
Kees Cookde832092016-11-11 11:48:06 -0800571 if (*paddr + mem_sz - cxt->phys_addr > cxt->size) {
Kees Cookc443a5f2016-11-11 14:05:57 -0800572 dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
573 name,
Kees Cookde832092016-11-11 11:48:06 -0800574 mem_sz, (unsigned long long)*paddr,
575 cxt->size, (unsigned long long)cxt->phys_addr);
576 goto fail;
577 }
578
579 zone_sz = mem_sz / *cnt;
Kees Cookc443a5f2016-11-11 14:05:57 -0800580 if (!zone_sz) {
581 dev_err(dev, "%s zone size == 0\n", name);
Kees Cookde832092016-11-11 11:48:06 -0800582 goto fail;
Kees Cookc443a5f2016-11-11 14:05:57 -0800583 }
Kees Cookde832092016-11-11 11:48:06 -0800584
585 prz_ar = kcalloc(*cnt, sizeof(**przs), GFP_KERNEL);
586 if (!prz_ar)
587 goto fail;
588
589 for (i = 0; i < *cnt; i++) {
590 prz_ar[i] = persistent_ram_new(*paddr, zone_sz, sig,
Tony Lindgren027bc8b02014-09-16 13:50:01 -0700591 &cxt->ecc_info,
Kees Cookde832092016-11-11 11:48:06 -0800592 cxt->memtype, flags);
593 if (IS_ERR(prz_ar[i])) {
594 err = PTR_ERR(prz_ar[i]);
Kees Cookc443a5f2016-11-11 14:05:57 -0800595 dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n",
596 name, record_size,
597 (unsigned long long)*paddr, err);
Sebastian Andrzej Siewior4407de72016-09-08 13:48:05 +0200598
599 while (i > 0) {
600 i--;
Kees Cookde832092016-11-11 11:48:06 -0800601 persistent_ram_free(prz_ar[i]);
Sebastian Andrzej Siewior4407de72016-09-08 13:48:05 +0200602 }
Kees Cookde832092016-11-11 11:48:06 -0800603 kfree(prz_ar);
604 goto fail;
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700605 }
Kees Cookde832092016-11-11 11:48:06 -0800606 *paddr += zone_sz;
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700607 }
608
Kees Cookde832092016-11-11 11:48:06 -0800609 *przs = prz_ar;
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700610 return 0;
Kees Cookde832092016-11-11 11:48:06 -0800611
612fail:
613 *cnt = 0;
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700614 return err;
615}
616
Kees Cookc443a5f2016-11-11 14:05:57 -0800617static int ramoops_init_prz(const char *name,
618 struct device *dev, struct ramoops_context *cxt,
Greg Kroah-Hartmanf568f6c2012-12-21 15:02:05 -0800619 struct persistent_ram_zone **prz,
620 phys_addr_t *paddr, size_t sz, u32 sig)
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700621{
622 if (!sz)
623 return 0;
624
Arve Hjønnevågc6289372012-12-11 17:49:24 -0800625 if (*paddr + sz - cxt->phys_addr > cxt->size) {
Kees Cookc443a5f2016-11-11 14:05:57 -0800626 dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
627 name, sz, (unsigned long long)*paddr,
Arve Hjønnevågc6289372012-12-11 17:49:24 -0800628 cxt->size, (unsigned long long)cxt->phys_addr);
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700629 return -ENOMEM;
Arve Hjønnevågc6289372012-12-11 17:49:24 -0800630 }
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700631
Joel Fernandes663deb42016-10-20 00:34:01 -0700632 *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info,
633 cxt->memtype, 0);
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700634 if (IS_ERR(*prz)) {
635 int err = PTR_ERR(*prz);
636
Kees Cookc443a5f2016-11-11 14:05:57 -0800637 dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n",
638 name, sz, (unsigned long long)*paddr, err);
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700639 return err;
640 }
641
642 persistent_ram_zap(*prz);
643
644 *paddr += sz;
645
646 return 0;
647}
648
Greg Hackmann35da6092016-01-07 15:40:56 -0800649static int ramoops_parse_dt_size(struct platform_device *pdev,
650 const char *propname, u32 *value)
651{
652 u32 val32 = 0;
653 int ret;
654
655 ret = of_property_read_u32(pdev->dev.of_node, propname, &val32);
656 if (ret < 0 && ret != -EINVAL) {
657 dev_err(&pdev->dev, "failed to parse property %s: %d\n",
658 propname, ret);
659 return ret;
660 }
661
662 if (val32 > INT_MAX) {
663 dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32);
664 return -EOVERFLOW;
665 }
666
667 *value = val32;
668 return 0;
669}
670
671static int ramoops_parse_dt(struct platform_device *pdev,
672 struct ramoops_platform_data *pdata)
673{
674 struct device_node *of_node = pdev->dev.of_node;
Kees Cook529182e2016-07-29 18:11:32 -0700675 struct resource *res;
Greg Hackmann35da6092016-01-07 15:40:56 -0800676 u32 value;
677 int ret;
678
679 dev_dbg(&pdev->dev, "using Device Tree\n");
680
Kees Cook529182e2016-07-29 18:11:32 -0700681 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
682 if (!res) {
Greg Hackmann35da6092016-01-07 15:40:56 -0800683 dev_err(&pdev->dev,
Kees Cook529182e2016-07-29 18:11:32 -0700684 "failed to locate DT /reserved-memory resource\n");
685 return -EINVAL;
Greg Hackmann35da6092016-01-07 15:40:56 -0800686 }
687
Kees Cook529182e2016-07-29 18:11:32 -0700688 pdata->mem_size = resource_size(res);
689 pdata->mem_address = res->start;
Greg Hackmann35da6092016-01-07 15:40:56 -0800690 pdata->mem_type = of_property_read_bool(of_node, "unbuffered");
691 pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops");
692
693#define parse_size(name, field) { \
694 ret = ramoops_parse_dt_size(pdev, name, &value); \
695 if (ret < 0) \
696 return ret; \
697 field = value; \
698 }
699
700 parse_size("record-size", pdata->record_size);
701 parse_size("console-size", pdata->console_size);
702 parse_size("ftrace-size", pdata->ftrace_size);
703 parse_size("pmsg-size", pdata->pmsg_size);
704 parse_size("ecc-size", pdata->ecc_info.ecc_size);
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700705 parse_size("flags", pdata->flags);
Greg Hackmann35da6092016-01-07 15:40:56 -0800706
707#undef parse_size
708
709 return 0;
710}
711
Greg Kroah-Hartmanf568f6c2012-12-21 15:02:05 -0800712static int ramoops_probe(struct platform_device *pdev)
Marco Stornelli56d611a2010-05-26 14:43:54 -0700713{
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700714 struct device *dev = &pdev->dev;
Greg Hackmann35da6092016-01-07 15:40:56 -0800715 struct ramoops_platform_data *pdata = dev->platform_data;
Kees Cook483ac8e2019-01-20 14:33:34 -0800716 struct ramoops_platform_data pdata_local;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700717 struct ramoops_context *cxt = &oops_cxt;
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700718 size_t dump_mem_sz;
719 phys_addr_t paddr;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700720 int err = -EINVAL;
721
Greg Hackmann35da6092016-01-07 15:40:56 -0800722 if (dev_of_node(dev) && !pdata) {
Kees Cook483ac8e2019-01-20 14:33:34 -0800723 pdata = &pdata_local;
724 memset(pdata, 0, sizeof(*pdata));
Greg Hackmann35da6092016-01-07 15:40:56 -0800725
726 err = ramoops_parse_dt(pdev, pdata);
727 if (err < 0)
728 goto fail_out;
729 }
730
Kees Cookfc46d4e2016-11-15 16:29:40 -0800731 /*
732 * Only a single ramoops area allowed at a time, so fail extra
Kees Cook9ba80d92012-05-03 15:45:02 +1000733 * probes.
734 */
Kees Cookfc46d4e2016-11-15 16:29:40 -0800735 if (cxt->max_dump_cnt) {
736 pr_err("already initialized\n");
Kees Cook9ba80d92012-05-03 15:45:02 +1000737 goto fail_out;
Kees Cookfc46d4e2016-11-15 16:29:40 -0800738 }
739
740 /* Make sure we didn't get bogus platform data pointer. */
741 if (!pdata) {
742 pr_err("NULL platform data\n");
743 goto fail_out;
744 }
Kees Cook9ba80d92012-05-03 15:45:02 +1000745
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700746 if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size &&
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800747 !pdata->ftrace_size && !pdata->pmsg_size)) {
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700748 pr_err("The memory size and the record/console size must be "
Sergiu Iordache3e5c4fa2011-07-26 16:08:59 -0700749 "non-zero\n");
Kees Cook9ba80d92012-05-03 15:45:02 +1000750 goto fail_out;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700751 }
752
Maxime Bizon3bd11cf2013-08-30 18:06:41 +0200753 if (pdata->record_size && !is_power_of_2(pdata->record_size))
Maxime Bizonb042e472012-10-22 11:19:28 +0200754 pdata->record_size = rounddown_pow_of_two(pdata->record_size);
Maxime Bizon3bd11cf2013-08-30 18:06:41 +0200755 if (pdata->console_size && !is_power_of_2(pdata->console_size))
Maxime Bizonb042e472012-10-22 11:19:28 +0200756 pdata->console_size = rounddown_pow_of_two(pdata->console_size);
Maxime Bizon3bd11cf2013-08-30 18:06:41 +0200757 if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size))
Maxime Bizonb042e472012-10-22 11:19:28 +0200758 pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size);
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800759 if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size))
760 pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size);
Marco Stornelli56d611a2010-05-26 14:43:54 -0700761
Marco Stornelli13aefd72011-07-26 16:08:57 -0700762 cxt->size = pdata->mem_size;
763 cxt->phys_addr = pdata->mem_address;
Tony Lindgren027bc8b02014-09-16 13:50:01 -0700764 cxt->memtype = pdata->mem_type;
Sergiu Iordache3e5c4fa2011-07-26 16:08:59 -0700765 cxt->record_size = pdata->record_size;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700766 cxt->console_size = pdata->console_size;
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700767 cxt->ftrace_size = pdata->ftrace_size;
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800768 cxt->pmsg_size = pdata->pmsg_size;
Sergiu Iordache6b4d2a22011-07-26 16:08:58 -0700769 cxt->dump_oops = pdata->dump_oops;
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700770 cxt->flags = pdata->flags;
Arve Hjønnevågc31ad082012-05-22 16:33:23 -0700771 cxt->ecc_info = pdata->ecc_info;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700772
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700773 paddr = cxt->phys_addr;
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700774
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800775 dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size
776 - cxt->pmsg_size;
Kees Cooka5d23b92016-11-11 14:30:11 -0800777 err = ramoops_init_przs("dump", dev, cxt, &cxt->dprzs, &paddr,
Kees Cookc443a5f2016-11-11 14:05:57 -0800778 dump_mem_sz, cxt->record_size,
779 &cxt->max_dump_cnt, 0, 0);
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700780 if (err)
781 goto fail_out;
782
Kees Cookc443a5f2016-11-11 14:05:57 -0800783 err = ramoops_init_prz("console", dev, cxt, &cxt->cprz, &paddr,
Anton Vorontsovcbe7cbf2012-07-17 12:11:12 -0700784 cxt->console_size, 0);
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700785 if (err)
786 goto fail_init_cprz;
787
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700788 cxt->max_ftrace_cnt = (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
789 ? nr_cpu_ids
790 : 1;
Kees Cookc443a5f2016-11-11 14:05:57 -0800791 err = ramoops_init_przs("ftrace", dev, cxt, &cxt->fprzs, &paddr,
792 cxt->ftrace_size, -1,
793 &cxt->max_ftrace_cnt, LINUX_VERSION_CODE,
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700794 (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
795 ? PRZ_FLAG_NO_LOCK : 0);
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700796 if (err)
797 goto fail_init_fprz;
798
Kees Cookc443a5f2016-11-11 14:05:57 -0800799 err = ramoops_init_prz("pmsg", dev, cxt, &cxt->mprz, &paddr,
800 cxt->pmsg_size, 0);
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800801 if (err)
802 goto fail_init_mprz;
803
Kees Cook9ba80d92012-05-03 15:45:02 +1000804 cxt->pstore.data = cxt;
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700805 /*
Kees Cookce469db2018-11-01 16:17:22 -0700806 * Since bufsize is only used for dmesg crash dumps, it
807 * must match the size of the dprz record (after PRZ header
808 * and ECC bytes have been accounted for).
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700809 */
Kees Cookce469db2018-11-01 16:17:22 -0700810 cxt->pstore.bufsize = cxt->dprzs[0]->buffer_size;
811 cxt->pstore.buf = kzalloc(cxt->pstore.bufsize, GFP_KERNEL);
Kees Cook9ba80d92012-05-03 15:45:02 +1000812 if (!cxt->pstore.buf) {
Kees Cookce469db2018-11-01 16:17:22 -0700813 pr_err("cannot allocate pstore crash dump buffer\n");
Wei Yongjun47110b82013-05-07 19:39:20 +0800814 err = -ENOMEM;
Kees Cook9ba80d92012-05-03 15:45:02 +1000815 goto fail_clear;
816 }
Geliang Tangf88baf62016-08-30 20:24:42 +0800817 spin_lock_init(&cxt->pstore.buf_lock);
Kees Cook9ba80d92012-05-03 15:45:02 +1000818
Namhyung Kim79d955a2016-07-28 00:08:26 +0900819 cxt->pstore.flags = PSTORE_FLAGS_DMESG;
820 if (cxt->console_size)
821 cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE;
822 if (cxt->ftrace_size)
823 cxt->pstore.flags |= PSTORE_FLAGS_FTRACE;
824 if (cxt->pmsg_size)
825 cxt->pstore.flags |= PSTORE_FLAGS_PMSG;
Namhyung Kimc950fd62016-07-28 00:08:25 +0900826
Kees Cook9ba80d92012-05-03 15:45:02 +1000827 err = pstore_register(&cxt->pstore);
Marco Stornelli56d611a2010-05-26 14:43:54 -0700828 if (err) {
Kees Cook9ba80d92012-05-03 15:45:02 +1000829 pr_err("registering with pstore failed\n");
Anton Vorontsov896fc1f2012-05-17 00:15:18 -0700830 goto fail_buf;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700831 }
832
Kees Cookc7552012012-01-12 17:20:59 -0800833 /*
834 * Update the module parameter variables as well so they are visible
835 * through /sys/module/ramoops/parameters/
836 */
837 mem_size = pdata->mem_size;
838 mem_address = pdata->mem_address;
839 record_size = pdata->record_size;
840 dump_oops = pdata->dump_oops;
Wang Long62f269e2015-03-09 07:39:07 +0000841 ramoops_console_size = pdata->console_size;
842 ramoops_pmsg_size = pdata->pmsg_size;
843 ramoops_ftrace_size = pdata->ftrace_size;
Kees Cookc7552012012-01-12 17:20:59 -0800844
Arve Hjønnevågc31ad082012-05-22 16:33:23 -0700845 pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n",
Randy Dunlapd109a672012-05-03 15:45:03 +1000846 cxt->size, (unsigned long long)cxt->phys_addr,
Arve Hjønnevågc31ad082012-05-22 16:33:23 -0700847 cxt->ecc_info.ecc_size, cxt->ecc_info.block_size);
Kees Cook9ba80d92012-05-03 15:45:02 +1000848
Marco Stornelli56d611a2010-05-26 14:43:54 -0700849 return 0;
850
Kees Cook9ba80d92012-05-03 15:45:02 +1000851fail_buf:
852 kfree(cxt->pstore.buf);
853fail_clear:
854 cxt->pstore.bufsize = 0;
Hiraku Toyookae976e562016-07-25 12:56:55 +0900855 persistent_ram_free(cxt->mprz);
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800856fail_init_mprz:
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700857fail_init_fprz:
Hiraku Toyookae976e562016-07-25 12:56:55 +0900858 persistent_ram_free(cxt->cprz);
Anton Vorontsovb5d38e92012-05-26 06:20:23 -0700859fail_init_cprz:
Anton Vorontsovf4c5d242012-05-26 06:20:21 -0700860 ramoops_free_przs(cxt);
Kees Cook9ba80d92012-05-03 15:45:02 +1000861fail_out:
Marco Stornelli56d611a2010-05-26 14:43:54 -0700862 return err;
863}
864
Geliang Tangee1d2672015-10-20 00:39:03 -0700865static int ramoops_remove(struct platform_device *pdev)
Marco Stornelli56d611a2010-05-26 14:43:54 -0700866{
867 struct ramoops_context *cxt = &oops_cxt;
868
Geliang Tangee1d2672015-10-20 00:39:03 -0700869 pstore_unregister(&cxt->pstore);
Kees Cook9ba80d92012-05-03 15:45:02 +1000870
Kees Cook9ba80d92012-05-03 15:45:02 +1000871 kfree(cxt->pstore.buf);
872 cxt->pstore.bufsize = 0;
873
Geliang Tangee1d2672015-10-20 00:39:03 -0700874 persistent_ram_free(cxt->mprz);
Geliang Tangee1d2672015-10-20 00:39:03 -0700875 persistent_ram_free(cxt->cprz);
876 ramoops_free_przs(cxt);
877
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700878 return 0;
Marco Stornelli56d611a2010-05-26 14:43:54 -0700879}
880
Greg Hackmann35da6092016-01-07 15:40:56 -0800881static const struct of_device_id dt_match[] = {
882 { .compatible = "ramoops" },
883 {}
884};
885
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700886static struct platform_driver ramoops_driver = {
Anton Vorontsov924d3712012-06-18 19:15:50 -0700887 .probe = ramoops_probe,
Geliang Tangee1d2672015-10-20 00:39:03 -0700888 .remove = ramoops_remove,
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700889 .driver = {
Greg Hackmann35da6092016-01-07 15:40:56 -0800890 .name = "ramoops",
891 .of_match_table = dt_match,
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700892 },
893};
894
Kees Cookbac6f6c2018-09-28 15:17:50 -0700895static inline void ramoops_unregister_dummy(void)
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700896{
Kees Cookbac6f6c2018-09-28 15:17:50 -0700897 platform_device_unregister(dummy);
898 dummy = NULL;
899
900 kfree(dummy_data);
901 dummy_data = NULL;
902}
903
904static void __init ramoops_register_dummy(void)
905{
906 /*
907 * Prepare a dummy platform data structure to carry the module
908 * parameters. If mem_size isn't set, then there are no module
909 * parameters, and we can skip this.
910 */
Anton Vorontsov924d3712012-06-18 19:15:50 -0700911 if (!mem_size)
912 return;
Marco Stornelli13aefd72011-07-26 16:08:57 -0700913
Anton Vorontsov924d3712012-06-18 19:15:50 -0700914 pr_info("using module parameters\n");
915
916 dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL);
917 if (!dummy_data) {
918 pr_info("could not allocate pdata\n");
919 return;
Marco Stornelli13aefd72011-07-26 16:08:57 -0700920 }
921
Anton Vorontsov924d3712012-06-18 19:15:50 -0700922 dummy_data->mem_size = mem_size;
923 dummy_data->mem_address = mem_address;
Wang Long07855052015-05-21 09:52:29 -0700924 dummy_data->mem_type = mem_type;
Anton Vorontsov924d3712012-06-18 19:15:50 -0700925 dummy_data->record_size = record_size;
926 dummy_data->console_size = ramoops_console_size;
Anton Vorontsova694d1b2012-07-09 17:10:44 -0700927 dummy_data->ftrace_size = ramoops_ftrace_size;
Mark Salyzyn9d5438f2015-01-16 16:01:10 -0800928 dummy_data->pmsg_size = ramoops_pmsg_size;
Anton Vorontsov924d3712012-06-18 19:15:50 -0700929 dummy_data->dump_oops = dump_oops;
Joel Fernandesa1cf53a2016-10-20 00:34:04 -0700930 dummy_data->flags = RAMOOPS_FLAG_FTRACE_PER_CPU;
931
Anton Vorontsov5ca5d4e2012-07-09 17:03:19 -0700932 /*
933 * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC
934 * (using 1 byte for ECC isn't much of use anyway).
935 */
Arve Hjønnevågc31ad082012-05-22 16:33:23 -0700936 dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc;
Anton Vorontsov924d3712012-06-18 19:15:50 -0700937
938 dummy = platform_device_register_data(NULL, "ramoops", -1,
939 dummy_data, sizeof(struct ramoops_platform_data));
940 if (IS_ERR(dummy)) {
941 pr_info("could not create platform device: %ld\n",
942 PTR_ERR(dummy));
Kees Cookbac6f6c2018-09-28 15:17:50 -0700943 dummy = NULL;
944 ramoops_unregister_dummy();
Anton Vorontsov924d3712012-06-18 19:15:50 -0700945 }
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700946}
947
Anton Vorontsov924d3712012-06-18 19:15:50 -0700948static int __init ramoops_init(void)
949{
Kees Cookbac6f6c2018-09-28 15:17:50 -0700950 int ret;
951
Anton Vorontsov924d3712012-06-18 19:15:50 -0700952 ramoops_register_dummy();
Kees Cookbac6f6c2018-09-28 15:17:50 -0700953 ret = platform_driver_register(&ramoops_driver);
954 if (ret != 0)
955 ramoops_unregister_dummy();
956
957 return ret;
Anton Vorontsov924d3712012-06-18 19:15:50 -0700958}
Geliang Tangcb3bee02018-03-09 18:51:07 +0800959late_initcall(ramoops_init);
Anton Vorontsov924d3712012-06-18 19:15:50 -0700960
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700961static void __exit ramoops_exit(void)
962{
963 platform_driver_unregister(&ramoops_driver);
Kees Cookbac6f6c2018-09-28 15:17:50 -0700964 ramoops_unregister_dummy();
Kyungmin Parkc3b92ce2010-10-27 15:34:52 -0700965}
Marco Stornelli56d611a2010-05-26 14:43:54 -0700966module_exit(ramoops_exit);
967
968MODULE_LICENSE("GPL");
969MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>");
970MODULE_DESCRIPTION("RAM Oops/Panic logger/driver");