Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 1 | /* |
| 2 | * RAM Oops/Panic logger |
| 3 | * |
| 4 | * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com> |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 5 | * Copyright (C) 2011 Kees Cook <keescook@chromium.org> |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 6 | * |
| 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 Stornelli | 0169256 | 2011-07-26 16:08:57 -0700 | [diff] [blame] | 23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 24 | |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 25 | #include <linux/kernel.h> |
James Bottomley | 83c1b31 | 2011-07-29 17:11:32 +0400 | [diff] [blame] | 26 | #include <linux/err.h> |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 27 | #include <linux/module.h> |
Anton Vorontsov | cbe7cbf | 2012-07-17 12:11:12 -0700 | [diff] [blame] | 28 | #include <linux/version.h> |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 29 | #include <linux/pstore.h> |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 30 | #include <linux/time.h> |
| 31 | #include <linux/io.h> |
| 32 | #include <linux/ioport.h> |
Kyungmin Park | c3b92ce | 2010-10-27 15:34:52 -0700 | [diff] [blame] | 33 | #include <linux/platform_device.h> |
Marco Stornelli | 13aefd7 | 2011-07-26 16:08:57 -0700 | [diff] [blame] | 34 | #include <linux/slab.h> |
Anton Vorontsov | 2420303 | 2012-07-17 19:49:37 -0700 | [diff] [blame] | 35 | #include <linux/compiler.h> |
Anton Vorontsov | 1894a25 | 2012-05-16 05:43:08 -0700 | [diff] [blame] | 36 | #include <linux/pstore_ram.h> |
Greg Hackmann | 35da609 | 2016-01-07 15:40:56 -0800 | [diff] [blame] | 37 | #include <linux/of.h> |
| 38 | #include <linux/of_address.h> |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 39 | |
| 40 | #define RAMOOPS_KERNMSG_HDR "====" |
Sergiu Iordache | 3e5c4fa | 2011-07-26 16:08:59 -0700 | [diff] [blame] | 41 | #define MIN_MEM_SIZE 4096UL |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 42 | |
Sergiu Iordache | 3e5c4fa | 2011-07-26 16:08:59 -0700 | [diff] [blame] | 43 | static ulong record_size = MIN_MEM_SIZE; |
| 44 | module_param(record_size, ulong, 0400); |
| 45 | MODULE_PARM_DESC(record_size, |
| 46 | "size of each dump done on oops/panic"); |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 47 | |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 48 | static ulong ramoops_console_size = MIN_MEM_SIZE; |
| 49 | module_param_named(console_size, ramoops_console_size, ulong, 0400); |
| 50 | MODULE_PARM_DESC(console_size, "size of kernel console log"); |
| 51 | |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 52 | static ulong ramoops_ftrace_size = MIN_MEM_SIZE; |
| 53 | module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400); |
| 54 | MODULE_PARM_DESC(ftrace_size, "size of ftrace log"); |
| 55 | |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 56 | static ulong ramoops_pmsg_size = MIN_MEM_SIZE; |
| 57 | module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400); |
| 58 | MODULE_PARM_DESC(pmsg_size, "size of user space message log"); |
| 59 | |
Wiebe, Wladislav (Nokia - DE/Ulm) | 764fd639 | 2015-11-13 12:10:05 +0000 | [diff] [blame] | 60 | static unsigned long long mem_address; |
| 61 | module_param(mem_address, ullong, 0400); |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 62 | MODULE_PARM_DESC(mem_address, |
| 63 | "start of reserved RAM used to store oops/panic logs"); |
| 64 | |
| 65 | static ulong mem_size; |
| 66 | module_param(mem_size, ulong, 0400); |
| 67 | MODULE_PARM_DESC(mem_size, |
| 68 | "size of reserved RAM used to store oops/panic logs"); |
| 69 | |
Tony Lindgren | 027bc8b | 2014-09-16 13:50:01 -0700 | [diff] [blame] | 70 | static unsigned int mem_type; |
| 71 | module_param(mem_type, uint, 0600); |
| 72 | MODULE_PARM_DESC(mem_type, |
| 73 | "set to 1 to try to use unbuffered memory (default 0)"); |
| 74 | |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 75 | static int dump_oops = 1; |
| 76 | module_param(dump_oops, int, 0600); |
| 77 | MODULE_PARM_DESC(dump_oops, |
| 78 | "set to 1 to dump oopses, 0 to only dump panics (default 1)"); |
| 79 | |
Anton Vorontsov | 39eb7e97 | 2012-05-17 00:15:34 -0700 | [diff] [blame] | 80 | static int ramoops_ecc; |
| 81 | module_param_named(ecc, ramoops_ecc, int, 0600); |
| 82 | MODULE_PARM_DESC(ramoops_ecc, |
Anton Vorontsov | 5ca5d4e | 2012-07-09 17:03:19 -0700 | [diff] [blame] | 83 | "if non-zero, the option enables ECC support and specifies " |
| 84 | "ECC buffer size in bytes (1 is a special value, means 16 " |
| 85 | "bytes ECC)"); |
Anton Vorontsov | 39eb7e97 | 2012-05-17 00:15:34 -0700 | [diff] [blame] | 86 | |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 87 | struct ramoops_context { |
Anton Vorontsov | 896fc1f | 2012-05-17 00:15:18 -0700 | [diff] [blame] | 88 | struct persistent_ram_zone **przs; |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 89 | struct persistent_ram_zone *cprz; |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 90 | struct persistent_ram_zone *fprz; |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 91 | struct persistent_ram_zone *mprz; |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 92 | phys_addr_t phys_addr; |
| 93 | unsigned long size; |
Tony Lindgren | 027bc8b | 2014-09-16 13:50:01 -0700 | [diff] [blame] | 94 | unsigned int memtype; |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 95 | size_t record_size; |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 96 | size_t console_size; |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 97 | size_t ftrace_size; |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 98 | size_t pmsg_size; |
Sergiu Iordache | 6b4d2a2 | 2011-07-26 16:08:58 -0700 | [diff] [blame] | 99 | int dump_oops; |
Arve Hjønnevåg | c31ad08 | 2012-05-22 16:33:23 -0700 | [diff] [blame] | 100 | struct persistent_ram_ecc_info ecc_info; |
Anton Vorontsov | cac2eb7 | 2012-05-26 06:20:20 -0700 | [diff] [blame] | 101 | unsigned int max_dump_cnt; |
| 102 | unsigned int dump_write_cnt; |
Liu ShuoX | 57fd835 | 2014-03-17 11:24:49 +1100 | [diff] [blame] | 103 | /* _read_cnt need clear on ramoops_pstore_open */ |
Anton Vorontsov | cac2eb7 | 2012-05-26 06:20:20 -0700 | [diff] [blame] | 104 | unsigned int dump_read_cnt; |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 105 | unsigned int console_read_cnt; |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 106 | unsigned int ftrace_read_cnt; |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 107 | unsigned int pmsg_read_cnt; |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 108 | struct pstore_info pstore; |
| 109 | }; |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 110 | |
Marco Stornelli | 13aefd7 | 2011-07-26 16:08:57 -0700 | [diff] [blame] | 111 | static struct platform_device *dummy; |
| 112 | static struct ramoops_platform_data *dummy_data; |
| 113 | |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 114 | static int ramoops_pstore_open(struct pstore_info *psi) |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 115 | { |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 116 | struct ramoops_context *cxt = psi->data; |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 117 | |
Anton Vorontsov | cac2eb7 | 2012-05-26 06:20:20 -0700 | [diff] [blame] | 118 | cxt->dump_read_cnt = 0; |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 119 | cxt->console_read_cnt = 0; |
Liu ShuoX | 57fd835 | 2014-03-17 11:24:49 +1100 | [diff] [blame] | 120 | cxt->ftrace_read_cnt = 0; |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 121 | cxt->pmsg_read_cnt = 0; |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 122 | return 0; |
| 123 | } |
| 124 | |
Anton Vorontsov | 755d66b | 2012-05-26 06:20:22 -0700 | [diff] [blame] | 125 | static struct persistent_ram_zone * |
| 126 | ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max, |
| 127 | u64 *id, |
| 128 | enum pstore_type_id *typep, enum pstore_type_id type, |
| 129 | bool update) |
| 130 | { |
| 131 | struct persistent_ram_zone *prz; |
| 132 | int i = (*c)++; |
| 133 | |
| 134 | if (i >= max) |
| 135 | return NULL; |
| 136 | |
| 137 | prz = przs[i]; |
Liu ShuoX | b0aa931 | 2014-03-17 13:57:49 -0700 | [diff] [blame] | 138 | if (!prz) |
| 139 | return NULL; |
Anton Vorontsov | 755d66b | 2012-05-26 06:20:22 -0700 | [diff] [blame] | 140 | |
Liu ShuoX | aa9a4a1 | 2014-03-17 11:24:49 +1100 | [diff] [blame] | 141 | /* Update old/shadowed buffer. */ |
| 142 | if (update) |
Anton Vorontsov | 755d66b | 2012-05-26 06:20:22 -0700 | [diff] [blame] | 143 | persistent_ram_save_old(prz); |
Liu ShuoX | aa9a4a1 | 2014-03-17 11:24:49 +1100 | [diff] [blame] | 144 | |
| 145 | if (!persistent_ram_old_size(prz)) |
| 146 | return NULL; |
Anton Vorontsov | 755d66b | 2012-05-26 06:20:22 -0700 | [diff] [blame] | 147 | |
| 148 | *typep = type; |
| 149 | *id = i; |
| 150 | |
| 151 | return prz; |
| 152 | } |
| 153 | |
Ben Zhang | a28726b | 2014-10-30 17:14:21 -0700 | [diff] [blame] | 154 | static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time, |
Aruna Balakrishnaiah | 3f8f80f | 2013-08-16 13:58:00 -0700 | [diff] [blame] | 155 | bool *compressed) |
| 156 | { |
| 157 | char data_type; |
Ben Zhang | a28726b | 2014-10-30 17:14:21 -0700 | [diff] [blame] | 158 | int header_length = 0; |
Aruna Balakrishnaiah | 3f8f80f | 2013-08-16 13:58:00 -0700 | [diff] [blame] | 159 | |
Ben Zhang | a28726b | 2014-10-30 17:14:21 -0700 | [diff] [blame] | 160 | if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n%n", &time->tv_sec, |
| 161 | &time->tv_nsec, &data_type, &header_length) == 3) { |
Aruna Balakrishnaiah | 3f8f80f | 2013-08-16 13:58:00 -0700 | [diff] [blame] | 162 | if (data_type == 'C') |
| 163 | *compressed = true; |
| 164 | else |
| 165 | *compressed = false; |
Ben Zhang | a28726b | 2014-10-30 17:14:21 -0700 | [diff] [blame] | 166 | } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n%n", |
| 167 | &time->tv_sec, &time->tv_nsec, &header_length) == 2) { |
Aruna Balakrishnaiah | 3f8f80f | 2013-08-16 13:58:00 -0700 | [diff] [blame] | 168 | *compressed = false; |
| 169 | } else { |
| 170 | time->tv_sec = 0; |
| 171 | time->tv_nsec = 0; |
| 172 | *compressed = false; |
| 173 | } |
Ben Zhang | a28726b | 2014-10-30 17:14:21 -0700 | [diff] [blame] | 174 | return header_length; |
Aruna Balakrishnaiah | 3f8f80f | 2013-08-16 13:58:00 -0700 | [diff] [blame] | 175 | } |
| 176 | |
Mark Salyzyn | f44f965 | 2015-01-13 14:32:50 -0800 | [diff] [blame] | 177 | static bool prz_ok(struct persistent_ram_zone *prz) |
| 178 | { |
| 179 | return !!prz && !!(persistent_ram_old_size(prz) + |
| 180 | persistent_ram_ecc_string(prz, NULL, 0)); |
| 181 | } |
| 182 | |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 183 | static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type, |
Seiji Aguchi | 755d4fe | 2012-11-26 16:07:44 -0800 | [diff] [blame] | 184 | int *count, struct timespec *time, |
Aruna Balakrishnaiah | 9a4e139 | 2013-08-16 13:53:19 -0700 | [diff] [blame] | 185 | char **buf, bool *compressed, |
Geliang Tang | 8cfc8dd | 2016-02-18 22:04:22 +0800 | [diff] [blame] | 186 | ssize_t *ecc_notice_size, |
Aruna Balakrishnaiah | 9a4e139 | 2013-08-16 13:53:19 -0700 | [diff] [blame] | 187 | struct pstore_info *psi) |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 188 | { |
| 189 | ssize_t size; |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 190 | struct ramoops_context *cxt = psi->data; |
Ben Zhang | e036bd3 | 2015-05-21 09:50:34 -0700 | [diff] [blame] | 191 | struct persistent_ram_zone *prz = NULL; |
| 192 | int header_length = 0; |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 193 | |
Ben Zhang | e036bd3 | 2015-05-21 09:50:34 -0700 | [diff] [blame] | 194 | /* Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but |
| 195 | * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have |
| 196 | * valid time stamps, so it is initialized to zero. |
| 197 | */ |
| 198 | time->tv_sec = 0; |
| 199 | time->tv_nsec = 0; |
| 200 | *compressed = false; |
| 201 | |
| 202 | /* Find the next valid persistent_ram_zone for DMESG */ |
| 203 | while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) { |
| 204 | prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt, |
| 205 | cxt->max_dump_cnt, id, type, |
| 206 | PSTORE_TYPE_DMESG, 1); |
| 207 | if (!prz_ok(prz)) |
| 208 | continue; |
| 209 | header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz), |
| 210 | time, compressed); |
| 211 | /* Clear and skip this DMESG record if it has no valid header */ |
| 212 | if (!header_length) { |
| 213 | persistent_ram_free_old(prz); |
| 214 | persistent_ram_zap(prz); |
| 215 | prz = NULL; |
| 216 | } |
| 217 | } |
| 218 | |
Mark Salyzyn | f44f965 | 2015-01-13 14:32:50 -0800 | [diff] [blame] | 219 | if (!prz_ok(prz)) |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 220 | prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt, |
| 221 | 1, id, type, PSTORE_TYPE_CONSOLE, 0); |
Mark Salyzyn | f44f965 | 2015-01-13 14:32:50 -0800 | [diff] [blame] | 222 | if (!prz_ok(prz)) |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 223 | prz = ramoops_get_next_prz(&cxt->fprz, &cxt->ftrace_read_cnt, |
| 224 | 1, id, type, PSTORE_TYPE_FTRACE, 0); |
Mark Salyzyn | f44f965 | 2015-01-13 14:32:50 -0800 | [diff] [blame] | 225 | if (!prz_ok(prz)) |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 226 | prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt, |
| 227 | 1, id, type, PSTORE_TYPE_PMSG, 0); |
| 228 | if (!prz_ok(prz)) |
Anton Vorontsov | 755d66b | 2012-05-26 06:20:22 -0700 | [diff] [blame] | 229 | return 0; |
Anton Vorontsov | 896fc1f | 2012-05-17 00:15:18 -0700 | [diff] [blame] | 230 | |
Ben Zhang | e036bd3 | 2015-05-21 09:50:34 -0700 | [diff] [blame] | 231 | size = persistent_ram_old_size(prz) - header_length; |
Arve Hjønnevåg | bd08ec3 | 2012-12-05 21:19:51 -0800 | [diff] [blame] | 232 | |
| 233 | /* ECC correction notice */ |
Geliang Tang | 8cfc8dd | 2016-02-18 22:04:22 +0800 | [diff] [blame] | 234 | *ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0); |
Arve Hjønnevåg | bd08ec3 | 2012-12-05 21:19:51 -0800 | [diff] [blame] | 235 | |
Geliang Tang | 8cfc8dd | 2016-02-18 22:04:22 +0800 | [diff] [blame] | 236 | *buf = kmalloc(size + *ecc_notice_size + 1, GFP_KERNEL); |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 237 | if (*buf == NULL) |
| 238 | return -ENOMEM; |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 239 | |
Ben Zhang | a28726b | 2014-10-30 17:14:21 -0700 | [diff] [blame] | 240 | memcpy(*buf, (char *)persistent_ram_old(prz) + header_length, size); |
Geliang Tang | 8cfc8dd | 2016-02-18 22:04:22 +0800 | [diff] [blame] | 241 | persistent_ram_ecc_string(prz, *buf + size, *ecc_notice_size + 1); |
Arve Hjønnevåg | bd08ec3 | 2012-12-05 21:19:51 -0800 | [diff] [blame] | 242 | |
Geliang Tang | 8cfc8dd | 2016-02-18 22:04:22 +0800 | [diff] [blame] | 243 | return size; |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 244 | } |
| 245 | |
Aruna Balakrishnaiah | 3f8f80f | 2013-08-16 13:58:00 -0700 | [diff] [blame] | 246 | static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz, |
| 247 | bool compressed) |
Anton Vorontsov | 896fc1f | 2012-05-17 00:15:18 -0700 | [diff] [blame] | 248 | { |
| 249 | char *hdr; |
Kees Cook | 1e817fb | 2012-11-19 10:26:16 -0800 | [diff] [blame] | 250 | struct timespec timestamp; |
Anton Vorontsov | 896fc1f | 2012-05-17 00:15:18 -0700 | [diff] [blame] | 251 | size_t len; |
| 252 | |
Kees Cook | 1e817fb | 2012-11-19 10:26:16 -0800 | [diff] [blame] | 253 | /* Report zeroed timestamp if called before timekeeping has resumed. */ |
| 254 | if (__getnstimeofday(×tamp)) { |
| 255 | timestamp.tv_sec = 0; |
| 256 | timestamp.tv_nsec = 0; |
| 257 | } |
Aruna Balakrishnaiah | 3f8f80f | 2013-08-16 13:58:00 -0700 | [diff] [blame] | 258 | hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n", |
| 259 | (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000), |
| 260 | compressed ? 'C' : 'D'); |
Anton Vorontsov | 896fc1f | 2012-05-17 00:15:18 -0700 | [diff] [blame] | 261 | WARN_ON_ONCE(!hdr); |
| 262 | len = hdr ? strlen(hdr) : 0; |
| 263 | persistent_ram_write(prz, hdr, len); |
| 264 | kfree(hdr); |
| 265 | |
| 266 | return len; |
| 267 | } |
| 268 | |
Anton Vorontsov | 2420303 | 2012-07-17 19:49:37 -0700 | [diff] [blame] | 269 | static int notrace ramoops_pstore_write_buf(enum pstore_type_id type, |
| 270 | enum kmsg_dump_reason reason, |
| 271 | u64 *id, unsigned int part, |
Aruna Balakrishnaiah | 6bbbca7 | 2013-06-27 14:02:56 +0530 | [diff] [blame] | 272 | const char *buf, |
Aruna Balakrishnaiah | b3b515b | 2013-08-16 13:52:47 -0700 | [diff] [blame] | 273 | bool compressed, size_t size, |
Anton Vorontsov | 2420303 | 2012-07-17 19:49:37 -0700 | [diff] [blame] | 274 | struct pstore_info *psi) |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 275 | { |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 276 | struct ramoops_context *cxt = psi->data; |
Arve Hjønnevåg | c628937 | 2012-12-11 17:49:24 -0800 | [diff] [blame] | 277 | struct persistent_ram_zone *prz; |
Anton Vorontsov | 896fc1f | 2012-05-17 00:15:18 -0700 | [diff] [blame] | 278 | size_t hlen; |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 279 | |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 280 | if (type == PSTORE_TYPE_CONSOLE) { |
| 281 | if (!cxt->cprz) |
| 282 | return -ENOMEM; |
Anton Vorontsov | c2b7113 | 2012-07-09 17:10:43 -0700 | [diff] [blame] | 283 | persistent_ram_write(cxt->cprz, buf, size); |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 284 | return 0; |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 285 | } else if (type == PSTORE_TYPE_FTRACE) { |
| 286 | if (!cxt->fprz) |
| 287 | return -ENOMEM; |
| 288 | persistent_ram_write(cxt->fprz, buf, size); |
| 289 | return 0; |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 290 | } else if (type == PSTORE_TYPE_PMSG) { |
| 291 | if (!cxt->mprz) |
| 292 | return -ENOMEM; |
| 293 | persistent_ram_write(cxt->mprz, buf, size); |
| 294 | return 0; |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 295 | } |
| 296 | |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 297 | if (type != PSTORE_TYPE_DMESG) |
| 298 | return -EINVAL; |
| 299 | |
| 300 | /* Out of the various dmesg dump types, ramoops is currently designed |
| 301 | * to only store crash logs, rather than storing general kernel logs. |
| 302 | */ |
Seiji Aguchi | fc2d557 | 2011-01-12 16:59:29 -0800 | [diff] [blame] | 303 | if (reason != KMSG_DUMP_OOPS && |
WANG Cong | a3dd332 | 2012-01-12 17:20:11 -0800 | [diff] [blame] | 304 | reason != KMSG_DUMP_PANIC) |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 305 | return -EINVAL; |
Seiji Aguchi | fc2d557 | 2011-01-12 16:59:29 -0800 | [diff] [blame] | 306 | |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 307 | /* Skip Oopes when configured to do so. */ |
Sergiu Iordache | 6b4d2a2 | 2011-07-26 16:08:58 -0700 | [diff] [blame] | 308 | if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops) |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 309 | return -EINVAL; |
| 310 | |
| 311 | /* Explicitly only take the first part of any new crash. |
| 312 | * If our buffer is larger than kmsg_bytes, this can never happen, |
| 313 | * and if our buffer is smaller than kmsg_bytes, we don't want the |
| 314 | * report split across multiple records. |
| 315 | */ |
| 316 | if (part != 1) |
| 317 | return -ENOSPC; |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 318 | |
Arve Hjønnevåg | c628937 | 2012-12-11 17:49:24 -0800 | [diff] [blame] | 319 | if (!cxt->przs) |
| 320 | return -ENOSPC; |
| 321 | |
| 322 | prz = cxt->przs[cxt->dump_write_cnt]; |
| 323 | |
Aleksandr Yashkin | b42bb8c | 2020-01-07 10:25:16 -0800 | [diff] [blame] | 324 | /* |
| 325 | * Since this is a new crash dump, we need to reset the buffer in |
| 326 | * case it still has an old dump present. Without this, the new dump |
| 327 | * will get appended, which would seriously confuse anything trying |
| 328 | * to check dump file contents. Specifically, ramoops_read_kmsg_hdr() |
| 329 | * expects to find a dump header in the beginning of buffer data, so |
| 330 | * we must to reset the buffer values, in order to ensure that the |
| 331 | * header will be written to the beginning of the buffer. |
| 332 | */ |
| 333 | persistent_ram_zap(prz); |
| 334 | |
Aruna Balakrishnaiah | 3f8f80f | 2013-08-16 13:58:00 -0700 | [diff] [blame] | 335 | hlen = ramoops_write_kmsg_hdr(prz, compressed); |
Anton Vorontsov | 896fc1f | 2012-05-17 00:15:18 -0700 | [diff] [blame] | 336 | if (size + hlen > prz->buffer_size) |
| 337 | size = prz->buffer_size - hlen; |
Anton Vorontsov | c2b7113 | 2012-07-09 17:10:43 -0700 | [diff] [blame] | 338 | persistent_ram_write(prz, buf, size); |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 339 | |
Anton Vorontsov | cac2eb7 | 2012-05-26 06:20:20 -0700 | [diff] [blame] | 340 | cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt; |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 341 | |
| 342 | return 0; |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 343 | } |
| 344 | |
Mark Salyzyn | 5bf6d1b | 2016-09-01 08:13:46 -0700 | [diff] [blame] | 345 | static int notrace ramoops_pstore_write_buf_user(enum pstore_type_id type, |
| 346 | enum kmsg_dump_reason reason, |
| 347 | u64 *id, unsigned int part, |
| 348 | const char __user *buf, |
| 349 | bool compressed, size_t size, |
| 350 | struct pstore_info *psi) |
| 351 | { |
| 352 | if (type == PSTORE_TYPE_PMSG) { |
| 353 | struct ramoops_context *cxt = psi->data; |
| 354 | |
| 355 | if (!cxt->mprz) |
| 356 | return -ENOMEM; |
| 357 | return persistent_ram_write_user(cxt->mprz, buf, size); |
| 358 | } |
| 359 | |
| 360 | return -EINVAL; |
| 361 | } |
| 362 | |
Seiji Aguchi | 755d4fe | 2012-11-26 16:07:44 -0800 | [diff] [blame] | 363 | static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count, |
Seiji Aguchi | a9efd39 | 2012-11-14 20:27:28 +0000 | [diff] [blame] | 364 | struct timespec time, struct pstore_info *psi) |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 365 | { |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 366 | struct ramoops_context *cxt = psi->data; |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 367 | struct persistent_ram_zone *prz; |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 368 | |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 369 | switch (type) { |
| 370 | case PSTORE_TYPE_DMESG: |
| 371 | if (id >= cxt->max_dump_cnt) |
| 372 | return -EINVAL; |
| 373 | prz = cxt->przs[id]; |
| 374 | break; |
| 375 | case PSTORE_TYPE_CONSOLE: |
| 376 | prz = cxt->cprz; |
| 377 | break; |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 378 | case PSTORE_TYPE_FTRACE: |
| 379 | prz = cxt->fprz; |
| 380 | break; |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 381 | case PSTORE_TYPE_PMSG: |
| 382 | prz = cxt->mprz; |
| 383 | break; |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 384 | default: |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 385 | return -EINVAL; |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 386 | } |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 387 | |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 388 | persistent_ram_free_old(prz); |
| 389 | persistent_ram_zap(prz); |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 390 | |
| 391 | return 0; |
| 392 | } |
| 393 | |
| 394 | static struct ramoops_context oops_cxt = { |
| 395 | .pstore = { |
| 396 | .owner = THIS_MODULE, |
| 397 | .name = "ramoops", |
| 398 | .open = ramoops_pstore_open, |
| 399 | .read = ramoops_pstore_read, |
Anton Vorontsov | c2b7113 | 2012-07-09 17:10:43 -0700 | [diff] [blame] | 400 | .write_buf = ramoops_pstore_write_buf, |
Mark Salyzyn | 5bf6d1b | 2016-09-01 08:13:46 -0700 | [diff] [blame] | 401 | .write_buf_user = ramoops_pstore_write_buf_user, |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 402 | .erase = ramoops_pstore_erase, |
| 403 | }, |
| 404 | }; |
| 405 | |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 406 | static void ramoops_free_przs(struct ramoops_context *cxt) |
| 407 | { |
| 408 | int i; |
| 409 | |
| 410 | if (!cxt->przs) |
| 411 | return; |
| 412 | |
Sebastian Andrzej Siewior | 4407de7 | 2016-09-08 13:48:05 +0200 | [diff] [blame] | 413 | for (i = 0; i < cxt->max_dump_cnt; i++) |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 414 | persistent_ram_free(cxt->przs[i]); |
Sebastian Andrzej Siewior | 4407de7 | 2016-09-08 13:48:05 +0200 | [diff] [blame] | 415 | |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 416 | kfree(cxt->przs); |
Sebastian Andrzej Siewior | 4407de7 | 2016-09-08 13:48:05 +0200 | [diff] [blame] | 417 | cxt->max_dump_cnt = 0; |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 418 | } |
| 419 | |
Greg Kroah-Hartman | f568f6c | 2012-12-21 15:02:05 -0800 | [diff] [blame] | 420 | static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt, |
| 421 | phys_addr_t *paddr, size_t dump_mem_sz) |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 422 | { |
| 423 | int err = -ENOMEM; |
| 424 | int i; |
| 425 | |
| 426 | if (!cxt->record_size) |
| 427 | return 0; |
| 428 | |
Arve Hjønnevåg | c628937 | 2012-12-11 17:49:24 -0800 | [diff] [blame] | 429 | if (*paddr + dump_mem_sz - cxt->phys_addr > cxt->size) { |
| 430 | dev_err(dev, "no room for dumps\n"); |
| 431 | return -ENOMEM; |
| 432 | } |
| 433 | |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 434 | cxt->max_dump_cnt = dump_mem_sz / cxt->record_size; |
| 435 | if (!cxt->max_dump_cnt) |
| 436 | return -ENOMEM; |
| 437 | |
| 438 | cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt, |
| 439 | GFP_KERNEL); |
| 440 | if (!cxt->przs) { |
| 441 | dev_err(dev, "failed to initialize a prz array for dumps\n"); |
Sebastian Andrzej Siewior | 4407de7 | 2016-09-08 13:48:05 +0200 | [diff] [blame] | 442 | goto fail_mem; |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 443 | } |
| 444 | |
| 445 | for (i = 0; i < cxt->max_dump_cnt; i++) { |
long.wanglong | 07239fc | 2015-05-21 09:47:22 -0700 | [diff] [blame] | 446 | cxt->przs[i] = persistent_ram_new(*paddr, cxt->record_size, 0, |
Tony Lindgren | 027bc8b | 2014-09-16 13:50:01 -0700 | [diff] [blame] | 447 | &cxt->ecc_info, |
Joel Fernandes | 46930803 | 2016-10-20 00:34:01 -0700 | [diff] [blame] | 448 | cxt->memtype, 0); |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 449 | if (IS_ERR(cxt->przs[i])) { |
| 450 | err = PTR_ERR(cxt->przs[i]); |
| 451 | dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", |
long.wanglong | 07239fc | 2015-05-21 09:47:22 -0700 | [diff] [blame] | 452 | cxt->record_size, (unsigned long long)*paddr, err); |
Sebastian Andrzej Siewior | 4407de7 | 2016-09-08 13:48:05 +0200 | [diff] [blame] | 453 | |
| 454 | while (i > 0) { |
| 455 | i--; |
| 456 | persistent_ram_free(cxt->przs[i]); |
| 457 | } |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 458 | goto fail_prz; |
| 459 | } |
long.wanglong | 07239fc | 2015-05-21 09:47:22 -0700 | [diff] [blame] | 460 | *paddr += cxt->record_size; |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 461 | } |
| 462 | |
| 463 | return 0; |
| 464 | fail_prz: |
Sebastian Andrzej Siewior | 4407de7 | 2016-09-08 13:48:05 +0200 | [diff] [blame] | 465 | kfree(cxt->przs); |
| 466 | fail_mem: |
| 467 | cxt->max_dump_cnt = 0; |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 468 | return err; |
| 469 | } |
| 470 | |
Greg Kroah-Hartman | f568f6c | 2012-12-21 15:02:05 -0800 | [diff] [blame] | 471 | static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt, |
| 472 | struct persistent_ram_zone **prz, |
| 473 | phys_addr_t *paddr, size_t sz, u32 sig) |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 474 | { |
| 475 | if (!sz) |
| 476 | return 0; |
| 477 | |
Arve Hjønnevåg | c628937 | 2012-12-11 17:49:24 -0800 | [diff] [blame] | 478 | if (*paddr + sz - cxt->phys_addr > cxt->size) { |
| 479 | dev_err(dev, "no room for mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", |
| 480 | sz, (unsigned long long)*paddr, |
| 481 | cxt->size, (unsigned long long)cxt->phys_addr); |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 482 | return -ENOMEM; |
Arve Hjønnevåg | c628937 | 2012-12-11 17:49:24 -0800 | [diff] [blame] | 483 | } |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 484 | |
Joel Fernandes | 46930803 | 2016-10-20 00:34:01 -0700 | [diff] [blame] | 485 | *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, |
| 486 | cxt->memtype, 0); |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 487 | if (IS_ERR(*prz)) { |
| 488 | int err = PTR_ERR(*prz); |
| 489 | |
| 490 | dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n", |
| 491 | sz, (unsigned long long)*paddr, err); |
| 492 | return err; |
| 493 | } |
| 494 | |
| 495 | persistent_ram_zap(*prz); |
| 496 | |
| 497 | *paddr += sz; |
| 498 | |
| 499 | return 0; |
| 500 | } |
| 501 | |
Greg Hackmann | 35da609 | 2016-01-07 15:40:56 -0800 | [diff] [blame] | 502 | static int ramoops_parse_dt_size(struct platform_device *pdev, |
| 503 | const char *propname, u32 *value) |
| 504 | { |
| 505 | u32 val32 = 0; |
| 506 | int ret; |
| 507 | |
| 508 | ret = of_property_read_u32(pdev->dev.of_node, propname, &val32); |
| 509 | if (ret < 0 && ret != -EINVAL) { |
| 510 | dev_err(&pdev->dev, "failed to parse property %s: %d\n", |
| 511 | propname, ret); |
| 512 | return ret; |
| 513 | } |
| 514 | |
| 515 | if (val32 > INT_MAX) { |
| 516 | dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32); |
| 517 | return -EOVERFLOW; |
| 518 | } |
| 519 | |
| 520 | *value = val32; |
| 521 | return 0; |
| 522 | } |
| 523 | |
| 524 | static int ramoops_parse_dt(struct platform_device *pdev, |
| 525 | struct ramoops_platform_data *pdata) |
| 526 | { |
| 527 | struct device_node *of_node = pdev->dev.of_node; |
Kees Cook | 529182e | 2016-07-29 18:11:32 -0700 | [diff] [blame] | 528 | struct resource *res; |
Greg Hackmann | 35da609 | 2016-01-07 15:40:56 -0800 | [diff] [blame] | 529 | u32 value; |
| 530 | int ret; |
| 531 | |
| 532 | dev_dbg(&pdev->dev, "using Device Tree\n"); |
| 533 | |
Kees Cook | 529182e | 2016-07-29 18:11:32 -0700 | [diff] [blame] | 534 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 535 | if (!res) { |
Greg Hackmann | 35da609 | 2016-01-07 15:40:56 -0800 | [diff] [blame] | 536 | dev_err(&pdev->dev, |
Kees Cook | 529182e | 2016-07-29 18:11:32 -0700 | [diff] [blame] | 537 | "failed to locate DT /reserved-memory resource\n"); |
| 538 | return -EINVAL; |
Greg Hackmann | 35da609 | 2016-01-07 15:40:56 -0800 | [diff] [blame] | 539 | } |
| 540 | |
Kees Cook | 529182e | 2016-07-29 18:11:32 -0700 | [diff] [blame] | 541 | pdata->mem_size = resource_size(res); |
| 542 | pdata->mem_address = res->start; |
Greg Hackmann | 35da609 | 2016-01-07 15:40:56 -0800 | [diff] [blame] | 543 | pdata->mem_type = of_property_read_bool(of_node, "unbuffered"); |
| 544 | pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops"); |
| 545 | |
| 546 | #define parse_size(name, field) { \ |
| 547 | ret = ramoops_parse_dt_size(pdev, name, &value); \ |
| 548 | if (ret < 0) \ |
| 549 | return ret; \ |
| 550 | field = value; \ |
| 551 | } |
| 552 | |
| 553 | parse_size("record-size", pdata->record_size); |
| 554 | parse_size("console-size", pdata->console_size); |
| 555 | parse_size("ftrace-size", pdata->ftrace_size); |
| 556 | parse_size("pmsg-size", pdata->pmsg_size); |
| 557 | parse_size("ecc-size", pdata->ecc_info.ecc_size); |
| 558 | |
| 559 | #undef parse_size |
| 560 | |
| 561 | return 0; |
| 562 | } |
| 563 | |
Greg Kroah-Hartman | f568f6c | 2012-12-21 15:02:05 -0800 | [diff] [blame] | 564 | static int ramoops_probe(struct platform_device *pdev) |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 565 | { |
Anton Vorontsov | 896fc1f | 2012-05-17 00:15:18 -0700 | [diff] [blame] | 566 | struct device *dev = &pdev->dev; |
Greg Hackmann | 35da609 | 2016-01-07 15:40:56 -0800 | [diff] [blame] | 567 | struct ramoops_platform_data *pdata = dev->platform_data; |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 568 | struct ramoops_context *cxt = &oops_cxt; |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 569 | size_t dump_mem_sz; |
| 570 | phys_addr_t paddr; |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 571 | int err = -EINVAL; |
| 572 | |
Greg Hackmann | 35da609 | 2016-01-07 15:40:56 -0800 | [diff] [blame] | 573 | if (dev_of_node(dev) && !pdata) { |
| 574 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); |
| 575 | if (!pdata) { |
| 576 | err = -ENOMEM; |
| 577 | goto fail_out; |
| 578 | } |
| 579 | |
| 580 | err = ramoops_parse_dt(pdev, pdata); |
| 581 | if (err < 0) |
| 582 | goto fail_out; |
| 583 | } |
| 584 | |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 585 | /* Only a single ramoops area allowed at a time, so fail extra |
| 586 | * probes. |
| 587 | */ |
Anton Vorontsov | cac2eb7 | 2012-05-26 06:20:20 -0700 | [diff] [blame] | 588 | if (cxt->max_dump_cnt) |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 589 | goto fail_out; |
| 590 | |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 591 | if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size && |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 592 | !pdata->ftrace_size && !pdata->pmsg_size)) { |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 593 | pr_err("The memory size and the record/console size must be " |
Sergiu Iordache | 3e5c4fa | 2011-07-26 16:08:59 -0700 | [diff] [blame] | 594 | "non-zero\n"); |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 595 | goto fail_out; |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 596 | } |
| 597 | |
Maxime Bizon | 3bd11cf | 2013-08-30 18:06:41 +0200 | [diff] [blame] | 598 | if (pdata->record_size && !is_power_of_2(pdata->record_size)) |
Maxime Bizon | b042e47 | 2012-10-22 11:19:28 +0200 | [diff] [blame] | 599 | pdata->record_size = rounddown_pow_of_two(pdata->record_size); |
Maxime Bizon | 3bd11cf | 2013-08-30 18:06:41 +0200 | [diff] [blame] | 600 | if (pdata->console_size && !is_power_of_2(pdata->console_size)) |
Maxime Bizon | b042e47 | 2012-10-22 11:19:28 +0200 | [diff] [blame] | 601 | pdata->console_size = rounddown_pow_of_two(pdata->console_size); |
Maxime Bizon | 3bd11cf | 2013-08-30 18:06:41 +0200 | [diff] [blame] | 602 | if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size)) |
Maxime Bizon | b042e47 | 2012-10-22 11:19:28 +0200 | [diff] [blame] | 603 | pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 604 | if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size)) |
| 605 | pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size); |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 606 | |
Marco Stornelli | 13aefd7 | 2011-07-26 16:08:57 -0700 | [diff] [blame] | 607 | cxt->size = pdata->mem_size; |
| 608 | cxt->phys_addr = pdata->mem_address; |
Tony Lindgren | 027bc8b | 2014-09-16 13:50:01 -0700 | [diff] [blame] | 609 | cxt->memtype = pdata->mem_type; |
Sergiu Iordache | 3e5c4fa | 2011-07-26 16:08:59 -0700 | [diff] [blame] | 610 | cxt->record_size = pdata->record_size; |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 611 | cxt->console_size = pdata->console_size; |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 612 | cxt->ftrace_size = pdata->ftrace_size; |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 613 | cxt->pmsg_size = pdata->pmsg_size; |
Sergiu Iordache | 6b4d2a2 | 2011-07-26 16:08:58 -0700 | [diff] [blame] | 614 | cxt->dump_oops = pdata->dump_oops; |
Arve Hjønnevåg | c31ad08 | 2012-05-22 16:33:23 -0700 | [diff] [blame] | 615 | cxt->ecc_info = pdata->ecc_info; |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 616 | |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 617 | paddr = cxt->phys_addr; |
Anton Vorontsov | 896fc1f | 2012-05-17 00:15:18 -0700 | [diff] [blame] | 618 | |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 619 | dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size |
| 620 | - cxt->pmsg_size; |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 621 | err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz); |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 622 | if (err) |
| 623 | goto fail_out; |
| 624 | |
Anton Vorontsov | cbe7cbf | 2012-07-17 12:11:12 -0700 | [diff] [blame] | 625 | err = ramoops_init_prz(dev, cxt, &cxt->cprz, &paddr, |
| 626 | cxt->console_size, 0); |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 627 | if (err) |
| 628 | goto fail_init_cprz; |
| 629 | |
Anton Vorontsov | cbe7cbf | 2012-07-17 12:11:12 -0700 | [diff] [blame] | 630 | err = ramoops_init_prz(dev, cxt, &cxt->fprz, &paddr, cxt->ftrace_size, |
| 631 | LINUX_VERSION_CODE); |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 632 | if (err) |
| 633 | goto fail_init_fprz; |
| 634 | |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 635 | err = ramoops_init_prz(dev, cxt, &cxt->mprz, &paddr, cxt->pmsg_size, 0); |
| 636 | if (err) |
| 637 | goto fail_init_mprz; |
| 638 | |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 639 | cxt->pstore.data = cxt; |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 640 | /* |
Anton Vorontsov | a384f641 | 2012-07-19 15:47:11 -0700 | [diff] [blame] | 641 | * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we |
| 642 | * have to handle dumps, we must have at least record_size buffer. And |
| 643 | * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be |
| 644 | * ZERO_SIZE_PTR). |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 645 | */ |
Anton Vorontsov | a384f641 | 2012-07-19 15:47:11 -0700 | [diff] [blame] | 646 | if (cxt->console_size) |
| 647 | cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */ |
| 648 | cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize); |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 649 | cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL); |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 650 | if (!cxt->pstore.buf) { |
| 651 | pr_err("cannot allocate pstore buffer\n"); |
Wei Yongjun | 47110b8 | 2013-05-07 19:39:20 +0800 | [diff] [blame] | 652 | err = -ENOMEM; |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 653 | goto fail_clear; |
| 654 | } |
Geliang Tang | f88baf6 | 2016-08-30 20:24:42 +0800 | [diff] [blame] | 655 | spin_lock_init(&cxt->pstore.buf_lock); |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 656 | |
Namhyung Kim | 79d955a | 2016-07-28 00:08:26 +0900 | [diff] [blame] | 657 | cxt->pstore.flags = PSTORE_FLAGS_DMESG; |
| 658 | if (cxt->console_size) |
| 659 | cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE; |
| 660 | if (cxt->ftrace_size) |
| 661 | cxt->pstore.flags |= PSTORE_FLAGS_FTRACE; |
| 662 | if (cxt->pmsg_size) |
| 663 | cxt->pstore.flags |= PSTORE_FLAGS_PMSG; |
Namhyung Kim | c950fd6 | 2016-07-28 00:08:25 +0900 | [diff] [blame] | 664 | |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 665 | err = pstore_register(&cxt->pstore); |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 666 | if (err) { |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 667 | pr_err("registering with pstore failed\n"); |
Anton Vorontsov | 896fc1f | 2012-05-17 00:15:18 -0700 | [diff] [blame] | 668 | goto fail_buf; |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 669 | } |
| 670 | |
Kees Cook | c755201 | 2012-01-12 17:20:59 -0800 | [diff] [blame] | 671 | /* |
| 672 | * Update the module parameter variables as well so they are visible |
| 673 | * through /sys/module/ramoops/parameters/ |
| 674 | */ |
| 675 | mem_size = pdata->mem_size; |
| 676 | mem_address = pdata->mem_address; |
| 677 | record_size = pdata->record_size; |
| 678 | dump_oops = pdata->dump_oops; |
Wang Long | 62f269e | 2015-03-09 07:39:07 +0000 | [diff] [blame] | 679 | ramoops_console_size = pdata->console_size; |
| 680 | ramoops_pmsg_size = pdata->pmsg_size; |
| 681 | ramoops_ftrace_size = pdata->ftrace_size; |
Kees Cook | c755201 | 2012-01-12 17:20:59 -0800 | [diff] [blame] | 682 | |
Arve Hjønnevåg | c31ad08 | 2012-05-22 16:33:23 -0700 | [diff] [blame] | 683 | pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n", |
Randy Dunlap | d109a67 | 2012-05-03 15:45:03 +1000 | [diff] [blame] | 684 | cxt->size, (unsigned long long)cxt->phys_addr, |
Arve Hjønnevåg | c31ad08 | 2012-05-22 16:33:23 -0700 | [diff] [blame] | 685 | cxt->ecc_info.ecc_size, cxt->ecc_info.block_size); |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 686 | |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 687 | return 0; |
| 688 | |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 689 | fail_buf: |
| 690 | kfree(cxt->pstore.buf); |
| 691 | fail_clear: |
| 692 | cxt->pstore.bufsize = 0; |
Hiraku Toyooka | e976e56 | 2016-07-25 12:56:55 +0900 | [diff] [blame] | 693 | persistent_ram_free(cxt->mprz); |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 694 | fail_init_mprz: |
Hiraku Toyooka | e976e56 | 2016-07-25 12:56:55 +0900 | [diff] [blame] | 695 | persistent_ram_free(cxt->fprz); |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 696 | fail_init_fprz: |
Hiraku Toyooka | e976e56 | 2016-07-25 12:56:55 +0900 | [diff] [blame] | 697 | persistent_ram_free(cxt->cprz); |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 698 | fail_init_cprz: |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 699 | ramoops_free_przs(cxt); |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 700 | fail_out: |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 701 | return err; |
| 702 | } |
| 703 | |
Geliang Tang | ee1d267 | 2015-10-20 00:39:03 -0700 | [diff] [blame] | 704 | static int ramoops_remove(struct platform_device *pdev) |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 705 | { |
| 706 | struct ramoops_context *cxt = &oops_cxt; |
| 707 | |
Geliang Tang | ee1d267 | 2015-10-20 00:39:03 -0700 | [diff] [blame] | 708 | pstore_unregister(&cxt->pstore); |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 709 | |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 710 | kfree(cxt->pstore.buf); |
| 711 | cxt->pstore.bufsize = 0; |
| 712 | |
Geliang Tang | ee1d267 | 2015-10-20 00:39:03 -0700 | [diff] [blame] | 713 | persistent_ram_free(cxt->mprz); |
| 714 | persistent_ram_free(cxt->fprz); |
| 715 | persistent_ram_free(cxt->cprz); |
| 716 | ramoops_free_przs(cxt); |
| 717 | |
Kyungmin Park | c3b92ce | 2010-10-27 15:34:52 -0700 | [diff] [blame] | 718 | return 0; |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 719 | } |
| 720 | |
Greg Hackmann | 35da609 | 2016-01-07 15:40:56 -0800 | [diff] [blame] | 721 | static const struct of_device_id dt_match[] = { |
| 722 | { .compatible = "ramoops" }, |
| 723 | {} |
| 724 | }; |
| 725 | |
Kyungmin Park | c3b92ce | 2010-10-27 15:34:52 -0700 | [diff] [blame] | 726 | static struct platform_driver ramoops_driver = { |
Anton Vorontsov | 924d371 | 2012-06-18 19:15:50 -0700 | [diff] [blame] | 727 | .probe = ramoops_probe, |
Geliang Tang | ee1d267 | 2015-10-20 00:39:03 -0700 | [diff] [blame] | 728 | .remove = ramoops_remove, |
Kyungmin Park | c3b92ce | 2010-10-27 15:34:52 -0700 | [diff] [blame] | 729 | .driver = { |
Greg Hackmann | 35da609 | 2016-01-07 15:40:56 -0800 | [diff] [blame] | 730 | .name = "ramoops", |
| 731 | .of_match_table = dt_match, |
Kyungmin Park | c3b92ce | 2010-10-27 15:34:52 -0700 | [diff] [blame] | 732 | }, |
| 733 | }; |
| 734 | |
Anton Vorontsov | 924d371 | 2012-06-18 19:15:50 -0700 | [diff] [blame] | 735 | static void ramoops_register_dummy(void) |
Kyungmin Park | c3b92ce | 2010-10-27 15:34:52 -0700 | [diff] [blame] | 736 | { |
Anton Vorontsov | 924d371 | 2012-06-18 19:15:50 -0700 | [diff] [blame] | 737 | if (!mem_size) |
| 738 | return; |
Marco Stornelli | 13aefd7 | 2011-07-26 16:08:57 -0700 | [diff] [blame] | 739 | |
Anton Vorontsov | 924d371 | 2012-06-18 19:15:50 -0700 | [diff] [blame] | 740 | pr_info("using module parameters\n"); |
| 741 | |
| 742 | dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL); |
| 743 | if (!dummy_data) { |
| 744 | pr_info("could not allocate pdata\n"); |
| 745 | return; |
Marco Stornelli | 13aefd7 | 2011-07-26 16:08:57 -0700 | [diff] [blame] | 746 | } |
| 747 | |
Anton Vorontsov | 924d371 | 2012-06-18 19:15:50 -0700 | [diff] [blame] | 748 | dummy_data->mem_size = mem_size; |
| 749 | dummy_data->mem_address = mem_address; |
Wang Long | 0785505 | 2015-05-21 09:52:29 -0700 | [diff] [blame] | 750 | dummy_data->mem_type = mem_type; |
Anton Vorontsov | 924d371 | 2012-06-18 19:15:50 -0700 | [diff] [blame] | 751 | dummy_data->record_size = record_size; |
| 752 | dummy_data->console_size = ramoops_console_size; |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 753 | dummy_data->ftrace_size = ramoops_ftrace_size; |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 754 | dummy_data->pmsg_size = ramoops_pmsg_size; |
Anton Vorontsov | 924d371 | 2012-06-18 19:15:50 -0700 | [diff] [blame] | 755 | dummy_data->dump_oops = dump_oops; |
Anton Vorontsov | 5ca5d4e | 2012-07-09 17:03:19 -0700 | [diff] [blame] | 756 | /* |
| 757 | * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC |
| 758 | * (using 1 byte for ECC isn't much of use anyway). |
| 759 | */ |
Arve Hjønnevåg | c31ad08 | 2012-05-22 16:33:23 -0700 | [diff] [blame] | 760 | dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc; |
Anton Vorontsov | 924d371 | 2012-06-18 19:15:50 -0700 | [diff] [blame] | 761 | |
| 762 | dummy = platform_device_register_data(NULL, "ramoops", -1, |
| 763 | dummy_data, sizeof(struct ramoops_platform_data)); |
| 764 | if (IS_ERR(dummy)) { |
| 765 | pr_info("could not create platform device: %ld\n", |
| 766 | PTR_ERR(dummy)); |
| 767 | } |
Kyungmin Park | c3b92ce | 2010-10-27 15:34:52 -0700 | [diff] [blame] | 768 | } |
| 769 | |
Anton Vorontsov | 924d371 | 2012-06-18 19:15:50 -0700 | [diff] [blame] | 770 | static int __init ramoops_init(void) |
| 771 | { |
| 772 | ramoops_register_dummy(); |
| 773 | return platform_driver_register(&ramoops_driver); |
| 774 | } |
| 775 | postcore_initcall(ramoops_init); |
| 776 | |
Kyungmin Park | c3b92ce | 2010-10-27 15:34:52 -0700 | [diff] [blame] | 777 | static void __exit ramoops_exit(void) |
| 778 | { |
| 779 | platform_driver_unregister(&ramoops_driver); |
Jovi Zhang | b4a871b | 2012-08-20 14:58:26 +0800 | [diff] [blame] | 780 | platform_device_unregister(dummy); |
Marco Stornelli | 13aefd7 | 2011-07-26 16:08:57 -0700 | [diff] [blame] | 781 | kfree(dummy_data); |
Kyungmin Park | c3b92ce | 2010-10-27 15:34:52 -0700 | [diff] [blame] | 782 | } |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 783 | module_exit(ramoops_exit); |
| 784 | |
| 785 | MODULE_LICENSE("GPL"); |
| 786 | MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>"); |
| 787 | MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); |