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/io.h> |
| 31 | #include <linux/ioport.h> |
Kyungmin Park | c3b92ce | 2010-10-27 15:34:52 -0700 | [diff] [blame] | 32 | #include <linux/platform_device.h> |
Marco Stornelli | 13aefd7 | 2011-07-26 16:08:57 -0700 | [diff] [blame] | 33 | #include <linux/slab.h> |
Anton Vorontsov | 2420303 | 2012-07-17 19:49:37 -0700 | [diff] [blame] | 34 | #include <linux/compiler.h> |
Anton Vorontsov | 1894a25 | 2012-05-16 05:43:08 -0700 | [diff] [blame] | 35 | #include <linux/pstore_ram.h> |
Greg Hackmann | 35da609 | 2016-01-07 15:40:56 -0800 | [diff] [blame] | 36 | #include <linux/of.h> |
| 37 | #include <linux/of_address.h> |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 38 | |
| 39 | #define RAMOOPS_KERNMSG_HDR "====" |
Sergiu Iordache | 3e5c4fa | 2011-07-26 16:08:59 -0700 | [diff] [blame] | 40 | #define MIN_MEM_SIZE 4096UL |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 41 | |
Sergiu Iordache | 3e5c4fa | 2011-07-26 16:08:59 -0700 | [diff] [blame] | 42 | static ulong record_size = MIN_MEM_SIZE; |
| 43 | module_param(record_size, ulong, 0400); |
| 44 | MODULE_PARM_DESC(record_size, |
| 45 | "size of each dump done on oops/panic"); |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 46 | |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 47 | static ulong ramoops_console_size = MIN_MEM_SIZE; |
| 48 | module_param_named(console_size, ramoops_console_size, ulong, 0400); |
| 49 | MODULE_PARM_DESC(console_size, "size of kernel console log"); |
| 50 | |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 51 | static ulong ramoops_ftrace_size = MIN_MEM_SIZE; |
| 52 | module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400); |
| 53 | MODULE_PARM_DESC(ftrace_size, "size of ftrace log"); |
| 54 | |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 55 | static ulong ramoops_pmsg_size = MIN_MEM_SIZE; |
| 56 | module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400); |
| 57 | MODULE_PARM_DESC(pmsg_size, "size of user space message log"); |
| 58 | |
Wiebe, Wladislav (Nokia - DE/Ulm) | 764fd639 | 2015-11-13 12:10:05 +0000 | [diff] [blame] | 59 | static unsigned long long mem_address; |
David Howells | b90fe0c | 2017-04-04 16:54:29 +0100 | [diff] [blame] | 60 | module_param_hw(mem_address, ullong, other, 0400); |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 61 | MODULE_PARM_DESC(mem_address, |
| 62 | "start of reserved RAM used to store oops/panic logs"); |
| 63 | |
| 64 | static ulong mem_size; |
| 65 | module_param(mem_size, ulong, 0400); |
| 66 | MODULE_PARM_DESC(mem_size, |
| 67 | "size of reserved RAM used to store oops/panic logs"); |
| 68 | |
Tony Lindgren | 027bc8b | 2014-09-16 13:50:01 -0700 | [diff] [blame] | 69 | static unsigned int mem_type; |
| 70 | module_param(mem_type, uint, 0600); |
| 71 | MODULE_PARM_DESC(mem_type, |
| 72 | "set to 1 to try to use unbuffered memory (default 0)"); |
| 73 | |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 74 | static int dump_oops = 1; |
| 75 | module_param(dump_oops, int, 0600); |
| 76 | MODULE_PARM_DESC(dump_oops, |
| 77 | "set to 1 to dump oopses, 0 to only dump panics (default 1)"); |
| 78 | |
Anton Vorontsov | 39eb7e97 | 2012-05-17 00:15:34 -0700 | [diff] [blame] | 79 | static int ramoops_ecc; |
| 80 | module_param_named(ecc, ramoops_ecc, int, 0600); |
| 81 | MODULE_PARM_DESC(ramoops_ecc, |
Anton Vorontsov | 5ca5d4e | 2012-07-09 17:03:19 -0700 | [diff] [blame] | 82 | "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 Vorontsov | 39eb7e97 | 2012-05-17 00:15:34 -0700 | [diff] [blame] | 85 | |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 86 | struct ramoops_context { |
Kees Cook | a5d23b9 | 2016-11-11 14:30:11 -0800 | [diff] [blame] | 87 | 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 Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 91 | phys_addr_t phys_addr; |
| 92 | unsigned long size; |
Tony Lindgren | 027bc8b | 2014-09-16 13:50:01 -0700 | [diff] [blame] | 93 | unsigned int memtype; |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 94 | size_t record_size; |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 95 | size_t console_size; |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 96 | size_t ftrace_size; |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 97 | size_t pmsg_size; |
Sergiu Iordache | 6b4d2a2 | 2011-07-26 16:08:58 -0700 | [diff] [blame] | 98 | int dump_oops; |
Joel Fernandes | a1cf53a | 2016-10-20 00:34:04 -0700 | [diff] [blame] | 99 | u32 flags; |
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; |
Joel Fernandes | a1cf53a | 2016-10-20 00:34:04 -0700 | [diff] [blame] | 106 | unsigned int max_ftrace_cnt; |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 107 | unsigned int ftrace_read_cnt; |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 108 | unsigned int pmsg_read_cnt; |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 109 | struct pstore_info pstore; |
| 110 | }; |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 111 | |
Marco Stornelli | 13aefd7 | 2011-07-26 16:08:57 -0700 | [diff] [blame] | 112 | static struct platform_device *dummy; |
| 113 | static struct ramoops_platform_data *dummy_data; |
| 114 | |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 115 | static int ramoops_pstore_open(struct pstore_info *psi) |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 116 | { |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 117 | struct ramoops_context *cxt = psi->data; |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 118 | |
Anton Vorontsov | cac2eb7 | 2012-05-26 06:20:20 -0700 | [diff] [blame] | 119 | cxt->dump_read_cnt = 0; |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 120 | cxt->console_read_cnt = 0; |
Liu ShuoX | 57fd835 | 2014-03-17 11:24:49 +1100 | [diff] [blame] | 121 | cxt->ftrace_read_cnt = 0; |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 122 | cxt->pmsg_read_cnt = 0; |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 123 | return 0; |
| 124 | } |
| 125 | |
Anton Vorontsov | 755d66b | 2012-05-26 06:20:22 -0700 | [diff] [blame] | 126 | static struct persistent_ram_zone * |
| 127 | ramoops_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 Cook | 4641841 | 2017-02-10 10:15:34 -0800 | [diff] [blame] | 135 | /* Give up if we never existed or have hit the end. */ |
| 136 | if (!przs || i >= max) |
Anton Vorontsov | 755d66b | 2012-05-26 06:20:22 -0700 | [diff] [blame] | 137 | return NULL; |
| 138 | |
| 139 | prz = przs[i]; |
Liu ShuoX | b0aa931 | 2014-03-17 13:57:49 -0700 | [diff] [blame] | 140 | if (!prz) |
| 141 | return NULL; |
Anton Vorontsov | 755d66b | 2012-05-26 06:20:22 -0700 | [diff] [blame] | 142 | |
Liu ShuoX | aa9a4a1 | 2014-03-17 11:24:49 +1100 | [diff] [blame] | 143 | /* Update old/shadowed buffer. */ |
| 144 | if (update) |
Anton Vorontsov | 755d66b | 2012-05-26 06:20:22 -0700 | [diff] [blame] | 145 | persistent_ram_save_old(prz); |
Liu ShuoX | aa9a4a1 | 2014-03-17 11:24:49 +1100 | [diff] [blame] | 146 | |
| 147 | if (!persistent_ram_old_size(prz)) |
| 148 | return NULL; |
Anton Vorontsov | 755d66b | 2012-05-26 06:20:22 -0700 | [diff] [blame] | 149 | |
| 150 | *typep = type; |
| 151 | *id = i; |
| 152 | |
| 153 | return prz; |
| 154 | } |
| 155 | |
Ben Zhang | a28726b | 2014-10-30 17:14:21 -0700 | [diff] [blame] | 156 | static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time, |
Aruna Balakrishnaiah | 3f8f80f | 2013-08-16 13:58:00 -0700 | [diff] [blame] | 157 | bool *compressed) |
| 158 | { |
| 159 | char data_type; |
Ben Zhang | a28726b | 2014-10-30 17:14:21 -0700 | [diff] [blame] | 160 | int header_length = 0; |
Aruna Balakrishnaiah | 3f8f80f | 2013-08-16 13:58:00 -0700 | [diff] [blame] | 161 | |
Ben Zhang | a28726b | 2014-10-30 17:14:21 -0700 | [diff] [blame] | 162 | if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n%n", &time->tv_sec, |
| 163 | &time->tv_nsec, &data_type, &header_length) == 3) { |
Aruna Balakrishnaiah | 3f8f80f | 2013-08-16 13:58:00 -0700 | [diff] [blame] | 164 | if (data_type == 'C') |
| 165 | *compressed = true; |
| 166 | else |
| 167 | *compressed = false; |
Ben Zhang | a28726b | 2014-10-30 17:14:21 -0700 | [diff] [blame] | 168 | } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n%n", |
| 169 | &time->tv_sec, &time->tv_nsec, &header_length) == 2) { |
Aruna Balakrishnaiah | 3f8f80f | 2013-08-16 13:58:00 -0700 | [diff] [blame] | 170 | *compressed = false; |
| 171 | } else { |
| 172 | time->tv_sec = 0; |
| 173 | time->tv_nsec = 0; |
| 174 | *compressed = false; |
| 175 | } |
Ben Zhang | a28726b | 2014-10-30 17:14:21 -0700 | [diff] [blame] | 176 | return header_length; |
Aruna Balakrishnaiah | 3f8f80f | 2013-08-16 13:58:00 -0700 | [diff] [blame] | 177 | } |
| 178 | |
Mark Salyzyn | f44f965 | 2015-01-13 14:32:50 -0800 | [diff] [blame] | 179 | static bool prz_ok(struct persistent_ram_zone *prz) |
| 180 | { |
| 181 | return !!prz && !!(persistent_ram_old_size(prz) + |
| 182 | persistent_ram_ecc_string(prz, NULL, 0)); |
| 183 | } |
| 184 | |
Joel Fernandes | 2fbea82 | 2016-10-20 00:34:06 -0700 | [diff] [blame] | 185 | static ssize_t ftrace_log_combine(struct persistent_ram_zone *dest, |
| 186 | struct persistent_ram_zone *src) |
| 187 | { |
| 188 | size_t dest_size, src_size, total, dest_off, src_off; |
| 189 | size_t dest_idx = 0, src_idx = 0, merged_idx = 0; |
| 190 | void *merged_buf; |
| 191 | struct pstore_ftrace_record *drec, *srec, *mrec; |
| 192 | size_t record_size = sizeof(struct pstore_ftrace_record); |
| 193 | |
| 194 | dest_off = dest->old_log_size % record_size; |
| 195 | dest_size = dest->old_log_size - dest_off; |
| 196 | |
| 197 | src_off = src->old_log_size % record_size; |
| 198 | src_size = src->old_log_size - src_off; |
| 199 | |
| 200 | total = dest_size + src_size; |
| 201 | merged_buf = kmalloc(total, GFP_KERNEL); |
| 202 | if (!merged_buf) |
| 203 | return -ENOMEM; |
| 204 | |
| 205 | drec = (struct pstore_ftrace_record *)(dest->old_log + dest_off); |
| 206 | srec = (struct pstore_ftrace_record *)(src->old_log + src_off); |
| 207 | mrec = (struct pstore_ftrace_record *)(merged_buf); |
| 208 | |
| 209 | while (dest_size > 0 && src_size > 0) { |
| 210 | if (pstore_ftrace_read_timestamp(&drec[dest_idx]) < |
| 211 | pstore_ftrace_read_timestamp(&srec[src_idx])) { |
| 212 | mrec[merged_idx++] = drec[dest_idx++]; |
| 213 | dest_size -= record_size; |
| 214 | } else { |
| 215 | mrec[merged_idx++] = srec[src_idx++]; |
| 216 | src_size -= record_size; |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | while (dest_size > 0) { |
| 221 | mrec[merged_idx++] = drec[dest_idx++]; |
| 222 | dest_size -= record_size; |
| 223 | } |
| 224 | |
| 225 | while (src_size > 0) { |
| 226 | mrec[merged_idx++] = srec[src_idx++]; |
| 227 | src_size -= record_size; |
| 228 | } |
| 229 | |
| 230 | kfree(dest->old_log); |
| 231 | dest->old_log = merged_buf; |
| 232 | dest->old_log_size = total; |
| 233 | |
| 234 | return 0; |
| 235 | } |
| 236 | |
Kees Cook | 125cc42 | 2017-03-03 22:09:18 -0800 | [diff] [blame] | 237 | static ssize_t ramoops_pstore_read(struct pstore_record *record) |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 238 | { |
Joel Fernandes | 2fbea82 | 2016-10-20 00:34:06 -0700 | [diff] [blame] | 239 | ssize_t size = 0; |
Kees Cook | 125cc42 | 2017-03-03 22:09:18 -0800 | [diff] [blame] | 240 | struct ramoops_context *cxt = record->psi->data; |
Ben Zhang | e036bd3 | 2015-05-21 09:50:34 -0700 | [diff] [blame] | 241 | struct persistent_ram_zone *prz = NULL; |
| 242 | int header_length = 0; |
Joel Fernandes | 2fbea82 | 2016-10-20 00:34:06 -0700 | [diff] [blame] | 243 | bool free_prz = false; |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 244 | |
Kees Cook | 125cc42 | 2017-03-03 22:09:18 -0800 | [diff] [blame] | 245 | /* |
| 246 | * Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but |
Ben Zhang | e036bd3 | 2015-05-21 09:50:34 -0700 | [diff] [blame] | 247 | * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have |
| 248 | * valid time stamps, so it is initialized to zero. |
| 249 | */ |
Kees Cook | 125cc42 | 2017-03-03 22:09:18 -0800 | [diff] [blame] | 250 | record->time.tv_sec = 0; |
| 251 | record->time.tv_nsec = 0; |
| 252 | record->compressed = false; |
Ben Zhang | e036bd3 | 2015-05-21 09:50:34 -0700 | [diff] [blame] | 253 | |
| 254 | /* Find the next valid persistent_ram_zone for DMESG */ |
| 255 | while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) { |
Kees Cook | a5d23b9 | 2016-11-11 14:30:11 -0800 | [diff] [blame] | 256 | prz = ramoops_get_next_prz(cxt->dprzs, &cxt->dump_read_cnt, |
Kees Cook | 125cc42 | 2017-03-03 22:09:18 -0800 | [diff] [blame] | 257 | cxt->max_dump_cnt, &record->id, |
| 258 | &record->type, |
Ben Zhang | e036bd3 | 2015-05-21 09:50:34 -0700 | [diff] [blame] | 259 | PSTORE_TYPE_DMESG, 1); |
| 260 | if (!prz_ok(prz)) |
| 261 | continue; |
| 262 | header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz), |
Kees Cook | 125cc42 | 2017-03-03 22:09:18 -0800 | [diff] [blame] | 263 | &record->time, |
| 264 | &record->compressed); |
Ben Zhang | e036bd3 | 2015-05-21 09:50:34 -0700 | [diff] [blame] | 265 | /* Clear and skip this DMESG record if it has no valid header */ |
| 266 | if (!header_length) { |
| 267 | persistent_ram_free_old(prz); |
| 268 | persistent_ram_zap(prz); |
| 269 | prz = NULL; |
| 270 | } |
| 271 | } |
| 272 | |
Mark Salyzyn | f44f965 | 2015-01-13 14:32:50 -0800 | [diff] [blame] | 273 | if (!prz_ok(prz)) |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 274 | prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt, |
Kees Cook | 125cc42 | 2017-03-03 22:09:18 -0800 | [diff] [blame] | 275 | 1, &record->id, &record->type, |
| 276 | PSTORE_TYPE_CONSOLE, 0); |
Joel Fernandes | a1cf53a | 2016-10-20 00:34:04 -0700 | [diff] [blame] | 277 | |
Mark Salyzyn | f44f965 | 2015-01-13 14:32:50 -0800 | [diff] [blame] | 278 | if (!prz_ok(prz)) |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 279 | prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt, |
Kees Cook | 125cc42 | 2017-03-03 22:09:18 -0800 | [diff] [blame] | 280 | 1, &record->id, &record->type, |
| 281 | PSTORE_TYPE_PMSG, 0); |
Joel Fernandes | 2fbea82 | 2016-10-20 00:34:06 -0700 | [diff] [blame] | 282 | |
| 283 | /* ftrace is last since it may want to dynamically allocate memory. */ |
Kees Cook | 4641841 | 2017-02-10 10:15:34 -0800 | [diff] [blame] | 284 | if (!prz_ok(prz)) { |
Joel Fernandes | 2fbea82 | 2016-10-20 00:34:06 -0700 | [diff] [blame] | 285 | if (!(cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)) { |
| 286 | prz = ramoops_get_next_prz(cxt->fprzs, |
Kees Cook | 125cc42 | 2017-03-03 22:09:18 -0800 | [diff] [blame] | 287 | &cxt->ftrace_read_cnt, 1, &record->id, |
| 288 | &record->type, PSTORE_TYPE_FTRACE, 0); |
Joel Fernandes | 2fbea82 | 2016-10-20 00:34:06 -0700 | [diff] [blame] | 289 | } else { |
| 290 | /* |
| 291 | * Build a new dummy record which combines all the |
| 292 | * per-cpu records including metadata and ecc info. |
| 293 | */ |
| 294 | struct persistent_ram_zone *tmp_prz, *prz_next; |
| 295 | |
| 296 | tmp_prz = kzalloc(sizeof(struct persistent_ram_zone), |
| 297 | GFP_KERNEL); |
| 298 | if (!tmp_prz) |
| 299 | return -ENOMEM; |
Kees Cook | 6c22e4a | 2018-12-03 16:39:01 -0800 | [diff] [blame] | 300 | prz = tmp_prz; |
Joel Fernandes | 2fbea82 | 2016-10-20 00:34:06 -0700 | [diff] [blame] | 301 | free_prz = true; |
| 302 | |
| 303 | while (cxt->ftrace_read_cnt < cxt->max_ftrace_cnt) { |
| 304 | prz_next = ramoops_get_next_prz(cxt->fprzs, |
| 305 | &cxt->ftrace_read_cnt, |
Kees Cook | 125cc42 | 2017-03-03 22:09:18 -0800 | [diff] [blame] | 306 | cxt->max_ftrace_cnt, |
| 307 | &record->id, |
| 308 | &record->type, |
| 309 | PSTORE_TYPE_FTRACE, 0); |
Joel Fernandes | 2fbea82 | 2016-10-20 00:34:06 -0700 | [diff] [blame] | 310 | |
| 311 | if (!prz_ok(prz_next)) |
| 312 | continue; |
| 313 | |
| 314 | tmp_prz->ecc_info = prz_next->ecc_info; |
| 315 | tmp_prz->corrected_bytes += |
| 316 | prz_next->corrected_bytes; |
| 317 | tmp_prz->bad_blocks += prz_next->bad_blocks; |
| 318 | size = ftrace_log_combine(tmp_prz, prz_next); |
| 319 | if (size) |
| 320 | goto out; |
| 321 | } |
Kees Cook | 125cc42 | 2017-03-03 22:09:18 -0800 | [diff] [blame] | 322 | record->id = 0; |
Joel Fernandes | 2fbea82 | 2016-10-20 00:34:06 -0700 | [diff] [blame] | 323 | } |
| 324 | } |
| 325 | |
| 326 | if (!prz_ok(prz)) { |
| 327 | size = 0; |
| 328 | goto out; |
| 329 | } |
Anton Vorontsov | 896fc1f | 2012-05-17 00:15:18 -0700 | [diff] [blame] | 330 | |
Ben Zhang | e036bd3 | 2015-05-21 09:50:34 -0700 | [diff] [blame] | 331 | size = persistent_ram_old_size(prz) - header_length; |
Arve Hjønnevåg | bd08ec3 | 2012-12-05 21:19:51 -0800 | [diff] [blame] | 332 | |
| 333 | /* ECC correction notice */ |
Kees Cook | 125cc42 | 2017-03-03 22:09:18 -0800 | [diff] [blame] | 334 | record->ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0); |
Arve Hjønnevåg | bd08ec3 | 2012-12-05 21:19:51 -0800 | [diff] [blame] | 335 | |
Kees Cook | 125cc42 | 2017-03-03 22:09:18 -0800 | [diff] [blame] | 336 | record->buf = kmalloc(size + record->ecc_notice_size + 1, GFP_KERNEL); |
| 337 | if (record->buf == NULL) { |
Joel Fernandes | 2fbea82 | 2016-10-20 00:34:06 -0700 | [diff] [blame] | 338 | size = -ENOMEM; |
| 339 | goto out; |
| 340 | } |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 341 | |
Kees Cook | 125cc42 | 2017-03-03 22:09:18 -0800 | [diff] [blame] | 342 | memcpy(record->buf, (char *)persistent_ram_old(prz) + header_length, |
| 343 | size); |
Joel Fernandes | 2fbea82 | 2016-10-20 00:34:06 -0700 | [diff] [blame] | 344 | |
Kees Cook | 125cc42 | 2017-03-03 22:09:18 -0800 | [diff] [blame] | 345 | persistent_ram_ecc_string(prz, record->buf + size, |
| 346 | record->ecc_notice_size + 1); |
Arve Hjønnevåg | bd08ec3 | 2012-12-05 21:19:51 -0800 | [diff] [blame] | 347 | |
Joel Fernandes | 2fbea82 | 2016-10-20 00:34:06 -0700 | [diff] [blame] | 348 | out: |
| 349 | if (free_prz) { |
| 350 | kfree(prz->old_log); |
| 351 | kfree(prz); |
| 352 | } |
| 353 | |
Geliang Tang | 8cfc8dd | 2016-02-18 22:04:22 +0800 | [diff] [blame] | 354 | return size; |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 355 | } |
| 356 | |
Aruna Balakrishnaiah | 3f8f80f | 2013-08-16 13:58:00 -0700 | [diff] [blame] | 357 | static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz, |
Kees Cook | c7f3c595 | 2017-05-19 15:29:10 -0700 | [diff] [blame] | 358 | struct pstore_record *record) |
Anton Vorontsov | 896fc1f | 2012-05-17 00:15:18 -0700 | [diff] [blame] | 359 | { |
| 360 | char *hdr; |
Anton Vorontsov | 896fc1f | 2012-05-17 00:15:18 -0700 | [diff] [blame] | 361 | size_t len; |
| 362 | |
Aruna Balakrishnaiah | 3f8f80f | 2013-08-16 13:58:00 -0700 | [diff] [blame] | 363 | hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n", |
Kees Cook | c7f3c595 | 2017-05-19 15:29:10 -0700 | [diff] [blame] | 364 | record->time.tv_sec, |
| 365 | record->time.tv_nsec / 1000, |
| 366 | record->compressed ? 'C' : 'D'); |
Anton Vorontsov | 896fc1f | 2012-05-17 00:15:18 -0700 | [diff] [blame] | 367 | WARN_ON_ONCE(!hdr); |
| 368 | len = hdr ? strlen(hdr) : 0; |
| 369 | persistent_ram_write(prz, hdr, len); |
| 370 | kfree(hdr); |
| 371 | |
| 372 | return len; |
| 373 | } |
| 374 | |
Kees Cook | 4c9ec21 | 2017-03-05 22:41:10 -0800 | [diff] [blame] | 375 | static int notrace ramoops_pstore_write(struct pstore_record *record) |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 376 | { |
Kees Cook | b10b471 | 2017-03-05 00:27:54 -0800 | [diff] [blame] | 377 | struct ramoops_context *cxt = record->psi->data; |
Arve Hjønnevåg | c628937 | 2012-12-11 17:49:24 -0800 | [diff] [blame] | 378 | struct persistent_ram_zone *prz; |
Kees Cook | b10b471 | 2017-03-05 00:27:54 -0800 | [diff] [blame] | 379 | size_t size, hlen; |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 380 | |
Kees Cook | b10b471 | 2017-03-05 00:27:54 -0800 | [diff] [blame] | 381 | if (record->type == PSTORE_TYPE_CONSOLE) { |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 382 | if (!cxt->cprz) |
| 383 | return -ENOMEM; |
Kees Cook | b10b471 | 2017-03-05 00:27:54 -0800 | [diff] [blame] | 384 | persistent_ram_write(cxt->cprz, record->buf, record->size); |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 385 | return 0; |
Kees Cook | b10b471 | 2017-03-05 00:27:54 -0800 | [diff] [blame] | 386 | } else if (record->type == PSTORE_TYPE_FTRACE) { |
Joel Fernandes | a1cf53a | 2016-10-20 00:34:04 -0700 | [diff] [blame] | 387 | int zonenum; |
| 388 | |
| 389 | if (!cxt->fprzs) |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 390 | return -ENOMEM; |
Joel Fernandes | a1cf53a | 2016-10-20 00:34:04 -0700 | [diff] [blame] | 391 | /* |
| 392 | * Choose zone by if we're using per-cpu buffers. |
| 393 | */ |
| 394 | if (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) |
| 395 | zonenum = smp_processor_id(); |
| 396 | else |
| 397 | zonenum = 0; |
| 398 | |
Kees Cook | b10b471 | 2017-03-05 00:27:54 -0800 | [diff] [blame] | 399 | persistent_ram_write(cxt->fprzs[zonenum], record->buf, |
| 400 | record->size); |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 401 | return 0; |
Kees Cook | b10b471 | 2017-03-05 00:27:54 -0800 | [diff] [blame] | 402 | } else if (record->type == PSTORE_TYPE_PMSG) { |
Joel Fernandes | d8991f5 | 2016-10-20 00:34:02 -0700 | [diff] [blame] | 403 | pr_warn_ratelimited("PMSG shouldn't call %s\n", __func__); |
| 404 | return -EINVAL; |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 405 | } |
| 406 | |
Kees Cook | b10b471 | 2017-03-05 00:27:54 -0800 | [diff] [blame] | 407 | if (record->type != PSTORE_TYPE_DMESG) |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 408 | return -EINVAL; |
| 409 | |
Kees Cook | b10b471 | 2017-03-05 00:27:54 -0800 | [diff] [blame] | 410 | /* |
| 411 | * Out of the various dmesg dump types, ramoops is currently designed |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 412 | * to only store crash logs, rather than storing general kernel logs. |
| 413 | */ |
Kees Cook | b10b471 | 2017-03-05 00:27:54 -0800 | [diff] [blame] | 414 | if (record->reason != KMSG_DUMP_OOPS && |
| 415 | record->reason != KMSG_DUMP_PANIC) |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 416 | return -EINVAL; |
Seiji Aguchi | fc2d557 | 2011-01-12 16:59:29 -0800 | [diff] [blame] | 417 | |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 418 | /* Skip Oopes when configured to do so. */ |
Kees Cook | b10b471 | 2017-03-05 00:27:54 -0800 | [diff] [blame] | 419 | if (record->reason == KMSG_DUMP_OOPS && !cxt->dump_oops) |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 420 | return -EINVAL; |
| 421 | |
Kees Cook | b10b471 | 2017-03-05 00:27:54 -0800 | [diff] [blame] | 422 | /* |
| 423 | * Explicitly only take the first part of any new crash. |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 424 | * If our buffer is larger than kmsg_bytes, this can never happen, |
| 425 | * and if our buffer is smaller than kmsg_bytes, we don't want the |
| 426 | * report split across multiple records. |
| 427 | */ |
Kees Cook | b10b471 | 2017-03-05 00:27:54 -0800 | [diff] [blame] | 428 | if (record->part != 1) |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 429 | return -ENOSPC; |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 430 | |
Kees Cook | a5d23b9 | 2016-11-11 14:30:11 -0800 | [diff] [blame] | 431 | if (!cxt->dprzs) |
Arve Hjønnevåg | c628937 | 2012-12-11 17:49:24 -0800 | [diff] [blame] | 432 | return -ENOSPC; |
| 433 | |
Kees Cook | a5d23b9 | 2016-11-11 14:30:11 -0800 | [diff] [blame] | 434 | prz = cxt->dprzs[cxt->dump_write_cnt]; |
Arve Hjønnevåg | c628937 | 2012-12-11 17:49:24 -0800 | [diff] [blame] | 435 | |
Aleksandr Yashkin | 45b0a5a | 2019-12-23 18:38:16 +0500 | [diff] [blame] | 436 | /* |
| 437 | * Since this is a new crash dump, we need to reset the buffer in |
| 438 | * case it still has an old dump present. Without this, the new dump |
| 439 | * will get appended, which would seriously confuse anything trying |
| 440 | * to check dump file contents. Specifically, ramoops_read_kmsg_hdr() |
| 441 | * expects to find a dump header in the beginning of buffer data, so |
| 442 | * we must to reset the buffer values, in order to ensure that the |
| 443 | * header will be written to the beginning of the buffer. |
| 444 | */ |
| 445 | persistent_ram_zap(prz); |
| 446 | |
Kees Cook | b10b471 | 2017-03-05 00:27:54 -0800 | [diff] [blame] | 447 | /* Build header and append record contents. */ |
Kees Cook | c7f3c595 | 2017-05-19 15:29:10 -0700 | [diff] [blame] | 448 | hlen = ramoops_write_kmsg_hdr(prz, record); |
Kees Cook | b10b471 | 2017-03-05 00:27:54 -0800 | [diff] [blame] | 449 | size = record->size; |
Anton Vorontsov | 896fc1f | 2012-05-17 00:15:18 -0700 | [diff] [blame] | 450 | if (size + hlen > prz->buffer_size) |
| 451 | size = prz->buffer_size - hlen; |
Kees Cook | b10b471 | 2017-03-05 00:27:54 -0800 | [diff] [blame] | 452 | persistent_ram_write(prz, record->buf, size); |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 453 | |
Anton Vorontsov | cac2eb7 | 2012-05-26 06:20:20 -0700 | [diff] [blame] | 454 | 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] | 455 | |
| 456 | return 0; |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 457 | } |
| 458 | |
Kees Cook | 4c9ec21 | 2017-03-05 22:41:10 -0800 | [diff] [blame] | 459 | static int notrace ramoops_pstore_write_user(struct pstore_record *record, |
| 460 | const char __user *buf) |
Mark Salyzyn | 5bf6d1b | 2016-09-01 08:13:46 -0700 | [diff] [blame] | 461 | { |
Kees Cook | fdd0311 | 2017-03-05 00:56:38 -0800 | [diff] [blame] | 462 | if (record->type == PSTORE_TYPE_PMSG) { |
| 463 | struct ramoops_context *cxt = record->psi->data; |
Mark Salyzyn | 5bf6d1b | 2016-09-01 08:13:46 -0700 | [diff] [blame] | 464 | |
| 465 | if (!cxt->mprz) |
| 466 | return -ENOMEM; |
Kees Cook | fdd0311 | 2017-03-05 00:56:38 -0800 | [diff] [blame] | 467 | return persistent_ram_write_user(cxt->mprz, buf, record->size); |
Mark Salyzyn | 5bf6d1b | 2016-09-01 08:13:46 -0700 | [diff] [blame] | 468 | } |
| 469 | |
| 470 | return -EINVAL; |
| 471 | } |
| 472 | |
Kees Cook | a61072a | 2017-03-04 23:31:19 -0800 | [diff] [blame] | 473 | static int ramoops_pstore_erase(struct pstore_record *record) |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 474 | { |
Kees Cook | a61072a | 2017-03-04 23:31:19 -0800 | [diff] [blame] | 475 | struct ramoops_context *cxt = record->psi->data; |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 476 | struct persistent_ram_zone *prz; |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 477 | |
Kees Cook | a61072a | 2017-03-04 23:31:19 -0800 | [diff] [blame] | 478 | switch (record->type) { |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 479 | case PSTORE_TYPE_DMESG: |
Kees Cook | a61072a | 2017-03-04 23:31:19 -0800 | [diff] [blame] | 480 | if (record->id >= cxt->max_dump_cnt) |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 481 | return -EINVAL; |
Kees Cook | a61072a | 2017-03-04 23:31:19 -0800 | [diff] [blame] | 482 | prz = cxt->dprzs[record->id]; |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 483 | break; |
| 484 | case PSTORE_TYPE_CONSOLE: |
| 485 | prz = cxt->cprz; |
| 486 | break; |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 487 | case PSTORE_TYPE_FTRACE: |
Kees Cook | a61072a | 2017-03-04 23:31:19 -0800 | [diff] [blame] | 488 | if (record->id >= cxt->max_ftrace_cnt) |
Joel Fernandes | a1cf53a | 2016-10-20 00:34:04 -0700 | [diff] [blame] | 489 | return -EINVAL; |
Kees Cook | a61072a | 2017-03-04 23:31:19 -0800 | [diff] [blame] | 490 | prz = cxt->fprzs[record->id]; |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 491 | break; |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 492 | case PSTORE_TYPE_PMSG: |
| 493 | prz = cxt->mprz; |
| 494 | break; |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 495 | default: |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 496 | return -EINVAL; |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 497 | } |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 498 | |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 499 | persistent_ram_free_old(prz); |
| 500 | persistent_ram_zap(prz); |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 501 | |
| 502 | return 0; |
| 503 | } |
| 504 | |
| 505 | static struct ramoops_context oops_cxt = { |
| 506 | .pstore = { |
| 507 | .owner = THIS_MODULE, |
| 508 | .name = "ramoops", |
| 509 | .open = ramoops_pstore_open, |
| 510 | .read = ramoops_pstore_read, |
Kees Cook | 4c9ec21 | 2017-03-05 22:41:10 -0800 | [diff] [blame] | 511 | .write = ramoops_pstore_write, |
| 512 | .write_user = ramoops_pstore_write_user, |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 513 | .erase = ramoops_pstore_erase, |
| 514 | }, |
| 515 | }; |
| 516 | |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 517 | static void ramoops_free_przs(struct ramoops_context *cxt) |
| 518 | { |
| 519 | int i; |
| 520 | |
Joel Fernandes | a1cf53a | 2016-10-20 00:34:04 -0700 | [diff] [blame] | 521 | /* Free dump PRZs */ |
Kees Cook | a5d23b9 | 2016-11-11 14:30:11 -0800 | [diff] [blame] | 522 | if (cxt->dprzs) { |
Joel Fernandes | a1cf53a | 2016-10-20 00:34:04 -0700 | [diff] [blame] | 523 | for (i = 0; i < cxt->max_dump_cnt; i++) |
Kees Cook | a5d23b9 | 2016-11-11 14:30:11 -0800 | [diff] [blame] | 524 | persistent_ram_free(cxt->dprzs[i]); |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 525 | |
Kees Cook | a5d23b9 | 2016-11-11 14:30:11 -0800 | [diff] [blame] | 526 | kfree(cxt->dprzs); |
Joel Fernandes | a1cf53a | 2016-10-20 00:34:04 -0700 | [diff] [blame] | 527 | cxt->max_dump_cnt = 0; |
| 528 | } |
Sebastian Andrzej Siewior | 4407de7 | 2016-09-08 13:48:05 +0200 | [diff] [blame] | 529 | |
Joel Fernandes | a1cf53a | 2016-10-20 00:34:04 -0700 | [diff] [blame] | 530 | /* Free ftrace PRZs */ |
| 531 | if (cxt->fprzs) { |
| 532 | for (i = 0; i < cxt->max_ftrace_cnt; i++) |
| 533 | persistent_ram_free(cxt->fprzs[i]); |
| 534 | kfree(cxt->fprzs); |
| 535 | cxt->max_ftrace_cnt = 0; |
| 536 | } |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 537 | } |
| 538 | |
Kees Cook | c443a5f | 2016-11-11 14:05:57 -0800 | [diff] [blame] | 539 | static int ramoops_init_przs(const char *name, |
| 540 | struct device *dev, struct ramoops_context *cxt, |
Kees Cook | de83209 | 2016-11-11 11:48:06 -0800 | [diff] [blame] | 541 | struct persistent_ram_zone ***przs, |
| 542 | phys_addr_t *paddr, size_t mem_sz, |
| 543 | ssize_t record_size, |
| 544 | unsigned int *cnt, u32 sig, u32 flags) |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 545 | { |
| 546 | int err = -ENOMEM; |
| 547 | int i; |
Kees Cook | de83209 | 2016-11-11 11:48:06 -0800 | [diff] [blame] | 548 | size_t zone_sz; |
| 549 | struct persistent_ram_zone **prz_ar; |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 550 | |
Kees Cook | de83209 | 2016-11-11 11:48:06 -0800 | [diff] [blame] | 551 | /* Allocate nothing for 0 mem_sz or 0 record_size. */ |
| 552 | if (mem_sz == 0 || record_size == 0) { |
| 553 | *cnt = 0; |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 554 | return 0; |
Arve Hjønnevåg | c628937 | 2012-12-11 17:49:24 -0800 | [diff] [blame] | 555 | } |
| 556 | |
Kees Cook | de83209 | 2016-11-11 11:48:06 -0800 | [diff] [blame] | 557 | /* |
| 558 | * If we have a negative record size, calculate it based on |
| 559 | * mem_sz / *cnt. If we have a positive record size, calculate |
| 560 | * cnt from mem_sz / record_size. |
| 561 | */ |
| 562 | if (record_size < 0) { |
| 563 | if (*cnt == 0) |
| 564 | return 0; |
| 565 | record_size = mem_sz / *cnt; |
Kees Cook | c443a5f | 2016-11-11 14:05:57 -0800 | [diff] [blame] | 566 | if (record_size == 0) { |
| 567 | dev_err(dev, "%s record size == 0 (%zu / %u)\n", |
| 568 | name, mem_sz, *cnt); |
Kees Cook | de83209 | 2016-11-11 11:48:06 -0800 | [diff] [blame] | 569 | goto fail; |
Kees Cook | c443a5f | 2016-11-11 14:05:57 -0800 | [diff] [blame] | 570 | } |
Kees Cook | de83209 | 2016-11-11 11:48:06 -0800 | [diff] [blame] | 571 | } else { |
| 572 | *cnt = mem_sz / record_size; |
Kees Cook | c443a5f | 2016-11-11 14:05:57 -0800 | [diff] [blame] | 573 | if (*cnt == 0) { |
| 574 | dev_err(dev, "%s record count == 0 (%zu / %zu)\n", |
| 575 | name, mem_sz, record_size); |
Kees Cook | de83209 | 2016-11-11 11:48:06 -0800 | [diff] [blame] | 576 | goto fail; |
Kees Cook | c443a5f | 2016-11-11 14:05:57 -0800 | [diff] [blame] | 577 | } |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 578 | } |
| 579 | |
Kees Cook | de83209 | 2016-11-11 11:48:06 -0800 | [diff] [blame] | 580 | if (*paddr + mem_sz - cxt->phys_addr > cxt->size) { |
Kees Cook | c443a5f | 2016-11-11 14:05:57 -0800 | [diff] [blame] | 581 | dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", |
| 582 | name, |
Kees Cook | de83209 | 2016-11-11 11:48:06 -0800 | [diff] [blame] | 583 | mem_sz, (unsigned long long)*paddr, |
| 584 | cxt->size, (unsigned long long)cxt->phys_addr); |
| 585 | goto fail; |
| 586 | } |
| 587 | |
| 588 | zone_sz = mem_sz / *cnt; |
Kees Cook | c443a5f | 2016-11-11 14:05:57 -0800 | [diff] [blame] | 589 | if (!zone_sz) { |
| 590 | dev_err(dev, "%s zone size == 0\n", name); |
Kees Cook | de83209 | 2016-11-11 11:48:06 -0800 | [diff] [blame] | 591 | goto fail; |
Kees Cook | c443a5f | 2016-11-11 14:05:57 -0800 | [diff] [blame] | 592 | } |
Kees Cook | de83209 | 2016-11-11 11:48:06 -0800 | [diff] [blame] | 593 | |
| 594 | prz_ar = kcalloc(*cnt, sizeof(**przs), GFP_KERNEL); |
| 595 | if (!prz_ar) |
| 596 | goto fail; |
| 597 | |
| 598 | for (i = 0; i < *cnt; i++) { |
| 599 | prz_ar[i] = persistent_ram_new(*paddr, zone_sz, sig, |
Tony Lindgren | 027bc8b | 2014-09-16 13:50:01 -0700 | [diff] [blame] | 600 | &cxt->ecc_info, |
Kees Cook | de83209 | 2016-11-11 11:48:06 -0800 | [diff] [blame] | 601 | cxt->memtype, flags); |
| 602 | if (IS_ERR(prz_ar[i])) { |
| 603 | err = PTR_ERR(prz_ar[i]); |
Kees Cook | c443a5f | 2016-11-11 14:05:57 -0800 | [diff] [blame] | 604 | dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n", |
| 605 | name, record_size, |
| 606 | (unsigned long long)*paddr, err); |
Sebastian Andrzej Siewior | 4407de7 | 2016-09-08 13:48:05 +0200 | [diff] [blame] | 607 | |
| 608 | while (i > 0) { |
| 609 | i--; |
Kees Cook | de83209 | 2016-11-11 11:48:06 -0800 | [diff] [blame] | 610 | persistent_ram_free(prz_ar[i]); |
Sebastian Andrzej Siewior | 4407de7 | 2016-09-08 13:48:05 +0200 | [diff] [blame] | 611 | } |
Kees Cook | de83209 | 2016-11-11 11:48:06 -0800 | [diff] [blame] | 612 | kfree(prz_ar); |
| 613 | goto fail; |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 614 | } |
Kees Cook | de83209 | 2016-11-11 11:48:06 -0800 | [diff] [blame] | 615 | *paddr += zone_sz; |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 616 | } |
| 617 | |
Kees Cook | de83209 | 2016-11-11 11:48:06 -0800 | [diff] [blame] | 618 | *przs = prz_ar; |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 619 | return 0; |
Kees Cook | de83209 | 2016-11-11 11:48:06 -0800 | [diff] [blame] | 620 | |
| 621 | fail: |
| 622 | *cnt = 0; |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 623 | return err; |
| 624 | } |
| 625 | |
Kees Cook | c443a5f | 2016-11-11 14:05:57 -0800 | [diff] [blame] | 626 | static int ramoops_init_prz(const char *name, |
| 627 | struct device *dev, struct ramoops_context *cxt, |
Greg Kroah-Hartman | f568f6c | 2012-12-21 15:02:05 -0800 | [diff] [blame] | 628 | struct persistent_ram_zone **prz, |
| 629 | phys_addr_t *paddr, size_t sz, u32 sig) |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 630 | { |
| 631 | if (!sz) |
| 632 | return 0; |
| 633 | |
Arve Hjønnevåg | c628937 | 2012-12-11 17:49:24 -0800 | [diff] [blame] | 634 | if (*paddr + sz - cxt->phys_addr > cxt->size) { |
Kees Cook | c443a5f | 2016-11-11 14:05:57 -0800 | [diff] [blame] | 635 | dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n", |
| 636 | name, sz, (unsigned long long)*paddr, |
Arve Hjønnevåg | c628937 | 2012-12-11 17:49:24 -0800 | [diff] [blame] | 637 | cxt->size, (unsigned long long)cxt->phys_addr); |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 638 | return -ENOMEM; |
Arve Hjønnevåg | c628937 | 2012-12-11 17:49:24 -0800 | [diff] [blame] | 639 | } |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 640 | |
Joel Fernandes | 663deb4 | 2016-10-20 00:34:01 -0700 | [diff] [blame] | 641 | *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, |
| 642 | cxt->memtype, 0); |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 643 | if (IS_ERR(*prz)) { |
| 644 | int err = PTR_ERR(*prz); |
| 645 | |
Kees Cook | c443a5f | 2016-11-11 14:05:57 -0800 | [diff] [blame] | 646 | dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n", |
| 647 | name, sz, (unsigned long long)*paddr, err); |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 648 | return err; |
| 649 | } |
| 650 | |
| 651 | persistent_ram_zap(*prz); |
| 652 | |
| 653 | *paddr += sz; |
| 654 | |
| 655 | return 0; |
| 656 | } |
| 657 | |
Greg Hackmann | 35da609 | 2016-01-07 15:40:56 -0800 | [diff] [blame] | 658 | static int ramoops_parse_dt_size(struct platform_device *pdev, |
| 659 | const char *propname, u32 *value) |
| 660 | { |
| 661 | u32 val32 = 0; |
| 662 | int ret; |
| 663 | |
| 664 | ret = of_property_read_u32(pdev->dev.of_node, propname, &val32); |
| 665 | if (ret < 0 && ret != -EINVAL) { |
| 666 | dev_err(&pdev->dev, "failed to parse property %s: %d\n", |
| 667 | propname, ret); |
| 668 | return ret; |
| 669 | } |
| 670 | |
| 671 | if (val32 > INT_MAX) { |
| 672 | dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32); |
| 673 | return -EOVERFLOW; |
| 674 | } |
| 675 | |
| 676 | *value = val32; |
| 677 | return 0; |
| 678 | } |
| 679 | |
| 680 | static int ramoops_parse_dt(struct platform_device *pdev, |
| 681 | struct ramoops_platform_data *pdata) |
| 682 | { |
| 683 | struct device_node *of_node = pdev->dev.of_node; |
Kees Cook | 529182e | 2016-07-29 18:11:32 -0700 | [diff] [blame] | 684 | struct resource *res; |
Greg Hackmann | 35da609 | 2016-01-07 15:40:56 -0800 | [diff] [blame] | 685 | u32 value; |
| 686 | int ret; |
| 687 | |
| 688 | dev_dbg(&pdev->dev, "using Device Tree\n"); |
| 689 | |
Kees Cook | 529182e | 2016-07-29 18:11:32 -0700 | [diff] [blame] | 690 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 691 | if (!res) { |
Greg Hackmann | 35da609 | 2016-01-07 15:40:56 -0800 | [diff] [blame] | 692 | dev_err(&pdev->dev, |
Kees Cook | 529182e | 2016-07-29 18:11:32 -0700 | [diff] [blame] | 693 | "failed to locate DT /reserved-memory resource\n"); |
| 694 | return -EINVAL; |
Greg Hackmann | 35da609 | 2016-01-07 15:40:56 -0800 | [diff] [blame] | 695 | } |
| 696 | |
Kees Cook | 529182e | 2016-07-29 18:11:32 -0700 | [diff] [blame] | 697 | pdata->mem_size = resource_size(res); |
| 698 | pdata->mem_address = res->start; |
Greg Hackmann | 35da609 | 2016-01-07 15:40:56 -0800 | [diff] [blame] | 699 | pdata->mem_type = of_property_read_bool(of_node, "unbuffered"); |
| 700 | pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops"); |
| 701 | |
| 702 | #define parse_size(name, field) { \ |
| 703 | ret = ramoops_parse_dt_size(pdev, name, &value); \ |
| 704 | if (ret < 0) \ |
| 705 | return ret; \ |
| 706 | field = value; \ |
| 707 | } |
| 708 | |
| 709 | parse_size("record-size", pdata->record_size); |
| 710 | parse_size("console-size", pdata->console_size); |
| 711 | parse_size("ftrace-size", pdata->ftrace_size); |
| 712 | parse_size("pmsg-size", pdata->pmsg_size); |
| 713 | parse_size("ecc-size", pdata->ecc_info.ecc_size); |
Joel Fernandes | a1cf53a | 2016-10-20 00:34:04 -0700 | [diff] [blame] | 714 | parse_size("flags", pdata->flags); |
Greg Hackmann | 35da609 | 2016-01-07 15:40:56 -0800 | [diff] [blame] | 715 | |
| 716 | #undef parse_size |
| 717 | |
| 718 | return 0; |
| 719 | } |
| 720 | |
Greg Kroah-Hartman | f568f6c | 2012-12-21 15:02:05 -0800 | [diff] [blame] | 721 | static int ramoops_probe(struct platform_device *pdev) |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 722 | { |
Anton Vorontsov | 896fc1f | 2012-05-17 00:15:18 -0700 | [diff] [blame] | 723 | struct device *dev = &pdev->dev; |
Greg Hackmann | 35da609 | 2016-01-07 15:40:56 -0800 | [diff] [blame] | 724 | struct ramoops_platform_data *pdata = dev->platform_data; |
Kees Cook | 96188b1 | 2019-01-20 14:33:34 -0800 | [diff] [blame] | 725 | struct ramoops_platform_data pdata_local; |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 726 | struct ramoops_context *cxt = &oops_cxt; |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 727 | size_t dump_mem_sz; |
| 728 | phys_addr_t paddr; |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 729 | int err = -EINVAL; |
| 730 | |
Greg Hackmann | 35da609 | 2016-01-07 15:40:56 -0800 | [diff] [blame] | 731 | if (dev_of_node(dev) && !pdata) { |
Kees Cook | 96188b1 | 2019-01-20 14:33:34 -0800 | [diff] [blame] | 732 | pdata = &pdata_local; |
| 733 | memset(pdata, 0, sizeof(*pdata)); |
Greg Hackmann | 35da609 | 2016-01-07 15:40:56 -0800 | [diff] [blame] | 734 | |
| 735 | err = ramoops_parse_dt(pdev, pdata); |
| 736 | if (err < 0) |
| 737 | goto fail_out; |
| 738 | } |
| 739 | |
Kees Cook | fc46d4e | 2016-11-15 16:29:40 -0800 | [diff] [blame] | 740 | /* |
| 741 | * Only a single ramoops area allowed at a time, so fail extra |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 742 | * probes. |
| 743 | */ |
Kees Cook | fc46d4e | 2016-11-15 16:29:40 -0800 | [diff] [blame] | 744 | if (cxt->max_dump_cnt) { |
| 745 | pr_err("already initialized\n"); |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 746 | goto fail_out; |
Kees Cook | fc46d4e | 2016-11-15 16:29:40 -0800 | [diff] [blame] | 747 | } |
| 748 | |
| 749 | /* Make sure we didn't get bogus platform data pointer. */ |
| 750 | if (!pdata) { |
| 751 | pr_err("NULL platform data\n"); |
| 752 | goto fail_out; |
| 753 | } |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 754 | |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 755 | if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size && |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 756 | !pdata->ftrace_size && !pdata->pmsg_size)) { |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 757 | pr_err("The memory size and the record/console size must be " |
Sergiu Iordache | 3e5c4fa | 2011-07-26 16:08:59 -0700 | [diff] [blame] | 758 | "non-zero\n"); |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 759 | goto fail_out; |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 760 | } |
| 761 | |
Maxime Bizon | 3bd11cf | 2013-08-30 18:06:41 +0200 | [diff] [blame] | 762 | if (pdata->record_size && !is_power_of_2(pdata->record_size)) |
Maxime Bizon | b042e47 | 2012-10-22 11:19:28 +0200 | [diff] [blame] | 763 | pdata->record_size = rounddown_pow_of_two(pdata->record_size); |
Maxime Bizon | 3bd11cf | 2013-08-30 18:06:41 +0200 | [diff] [blame] | 764 | if (pdata->console_size && !is_power_of_2(pdata->console_size)) |
Maxime Bizon | b042e47 | 2012-10-22 11:19:28 +0200 | [diff] [blame] | 765 | pdata->console_size = rounddown_pow_of_two(pdata->console_size); |
Maxime Bizon | 3bd11cf | 2013-08-30 18:06:41 +0200 | [diff] [blame] | 766 | if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size)) |
Maxime Bizon | b042e47 | 2012-10-22 11:19:28 +0200 | [diff] [blame] | 767 | pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 768 | if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size)) |
| 769 | pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size); |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 770 | |
Marco Stornelli | 13aefd7 | 2011-07-26 16:08:57 -0700 | [diff] [blame] | 771 | cxt->size = pdata->mem_size; |
| 772 | cxt->phys_addr = pdata->mem_address; |
Tony Lindgren | 027bc8b | 2014-09-16 13:50:01 -0700 | [diff] [blame] | 773 | cxt->memtype = pdata->mem_type; |
Sergiu Iordache | 3e5c4fa | 2011-07-26 16:08:59 -0700 | [diff] [blame] | 774 | cxt->record_size = pdata->record_size; |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 775 | cxt->console_size = pdata->console_size; |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 776 | cxt->ftrace_size = pdata->ftrace_size; |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 777 | cxt->pmsg_size = pdata->pmsg_size; |
Sergiu Iordache | 6b4d2a2 | 2011-07-26 16:08:58 -0700 | [diff] [blame] | 778 | cxt->dump_oops = pdata->dump_oops; |
Joel Fernandes | a1cf53a | 2016-10-20 00:34:04 -0700 | [diff] [blame] | 779 | cxt->flags = pdata->flags; |
Arve Hjønnevåg | c31ad08 | 2012-05-22 16:33:23 -0700 | [diff] [blame] | 780 | cxt->ecc_info = pdata->ecc_info; |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 781 | |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 782 | paddr = cxt->phys_addr; |
Anton Vorontsov | 896fc1f | 2012-05-17 00:15:18 -0700 | [diff] [blame] | 783 | |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 784 | dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size |
| 785 | - cxt->pmsg_size; |
Kees Cook | a5d23b9 | 2016-11-11 14:30:11 -0800 | [diff] [blame] | 786 | err = ramoops_init_przs("dump", dev, cxt, &cxt->dprzs, &paddr, |
Kees Cook | c443a5f | 2016-11-11 14:05:57 -0800 | [diff] [blame] | 787 | dump_mem_sz, cxt->record_size, |
| 788 | &cxt->max_dump_cnt, 0, 0); |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 789 | if (err) |
| 790 | goto fail_out; |
| 791 | |
Kees Cook | c443a5f | 2016-11-11 14:05:57 -0800 | [diff] [blame] | 792 | err = ramoops_init_prz("console", dev, cxt, &cxt->cprz, &paddr, |
Anton Vorontsov | cbe7cbf | 2012-07-17 12:11:12 -0700 | [diff] [blame] | 793 | cxt->console_size, 0); |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 794 | if (err) |
| 795 | goto fail_init_cprz; |
| 796 | |
Joel Fernandes | a1cf53a | 2016-10-20 00:34:04 -0700 | [diff] [blame] | 797 | cxt->max_ftrace_cnt = (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) |
| 798 | ? nr_cpu_ids |
| 799 | : 1; |
Kees Cook | c443a5f | 2016-11-11 14:05:57 -0800 | [diff] [blame] | 800 | err = ramoops_init_przs("ftrace", dev, cxt, &cxt->fprzs, &paddr, |
| 801 | cxt->ftrace_size, -1, |
| 802 | &cxt->max_ftrace_cnt, LINUX_VERSION_CODE, |
Joel Fernandes | a1cf53a | 2016-10-20 00:34:04 -0700 | [diff] [blame] | 803 | (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU) |
| 804 | ? PRZ_FLAG_NO_LOCK : 0); |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 805 | if (err) |
| 806 | goto fail_init_fprz; |
| 807 | |
Kees Cook | c443a5f | 2016-11-11 14:05:57 -0800 | [diff] [blame] | 808 | err = ramoops_init_prz("pmsg", dev, cxt, &cxt->mprz, &paddr, |
| 809 | cxt->pmsg_size, 0); |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 810 | if (err) |
| 811 | goto fail_init_mprz; |
| 812 | |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 813 | cxt->pstore.data = cxt; |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 814 | /* |
Kees Cook | 08ae2e8 | 2019-05-30 23:37:29 -0700 | [diff] [blame] | 815 | * Prepare frontend flags based on which areas are initialized. |
| 816 | * For ramoops_init_przs() cases, the "max count" variable tells |
| 817 | * if there are regions present. For ramoops_init_prz() cases, |
| 818 | * the single region size is how to check. |
| 819 | */ |
| 820 | cxt->pstore.flags = 0; |
| 821 | if (cxt->max_dump_cnt) |
| 822 | cxt->pstore.flags |= PSTORE_FLAGS_DMESG; |
| 823 | if (cxt->console_size) |
| 824 | cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE; |
| 825 | if (cxt->max_ftrace_cnt) |
| 826 | cxt->pstore.flags |= PSTORE_FLAGS_FTRACE; |
| 827 | if (cxt->pmsg_size) |
| 828 | cxt->pstore.flags |= PSTORE_FLAGS_PMSG; |
| 829 | |
| 830 | /* |
Kees Cook | b718d6b | 2018-11-01 16:17:22 -0700 | [diff] [blame] | 831 | * Since bufsize is only used for dmesg crash dumps, it |
| 832 | * must match the size of the dprz record (after PRZ header |
| 833 | * and ECC bytes have been accounted for). |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 834 | */ |
Kees Cook | 08ae2e8 | 2019-05-30 23:37:29 -0700 | [diff] [blame] | 835 | if (cxt->pstore.flags & PSTORE_FLAGS_DMESG) { |
| 836 | cxt->pstore.bufsize = cxt->dprzs[0]->buffer_size; |
| 837 | cxt->pstore.buf = kzalloc(cxt->pstore.bufsize, GFP_KERNEL); |
| 838 | if (!cxt->pstore.buf) { |
| 839 | pr_err("cannot allocate pstore crash dump buffer\n"); |
| 840 | err = -ENOMEM; |
| 841 | goto fail_clear; |
| 842 | } |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 843 | } |
| 844 | |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 845 | err = pstore_register(&cxt->pstore); |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 846 | if (err) { |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 847 | pr_err("registering with pstore failed\n"); |
Anton Vorontsov | 896fc1f | 2012-05-17 00:15:18 -0700 | [diff] [blame] | 848 | goto fail_buf; |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 849 | } |
| 850 | |
Kees Cook | c755201 | 2012-01-12 17:20:59 -0800 | [diff] [blame] | 851 | /* |
| 852 | * Update the module parameter variables as well so they are visible |
| 853 | * through /sys/module/ramoops/parameters/ |
| 854 | */ |
| 855 | mem_size = pdata->mem_size; |
| 856 | mem_address = pdata->mem_address; |
| 857 | record_size = pdata->record_size; |
| 858 | dump_oops = pdata->dump_oops; |
Wang Long | 62f269e | 2015-03-09 07:39:07 +0000 | [diff] [blame] | 859 | ramoops_console_size = pdata->console_size; |
| 860 | ramoops_pmsg_size = pdata->pmsg_size; |
| 861 | ramoops_ftrace_size = pdata->ftrace_size; |
Kees Cook | c755201 | 2012-01-12 17:20:59 -0800 | [diff] [blame] | 862 | |
Arve Hjønnevåg | c31ad08 | 2012-05-22 16:33:23 -0700 | [diff] [blame] | 863 | pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n", |
Randy Dunlap | d109a67 | 2012-05-03 15:45:03 +1000 | [diff] [blame] | 864 | cxt->size, (unsigned long long)cxt->phys_addr, |
Arve Hjønnevåg | c31ad08 | 2012-05-22 16:33:23 -0700 | [diff] [blame] | 865 | cxt->ecc_info.ecc_size, cxt->ecc_info.block_size); |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 866 | |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 867 | return 0; |
| 868 | |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 869 | fail_buf: |
| 870 | kfree(cxt->pstore.buf); |
| 871 | fail_clear: |
| 872 | cxt->pstore.bufsize = 0; |
Hiraku Toyooka | e976e56 | 2016-07-25 12:56:55 +0900 | [diff] [blame] | 873 | persistent_ram_free(cxt->mprz); |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 874 | fail_init_mprz: |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 875 | fail_init_fprz: |
Hiraku Toyooka | e976e56 | 2016-07-25 12:56:55 +0900 | [diff] [blame] | 876 | persistent_ram_free(cxt->cprz); |
Anton Vorontsov | b5d38e9 | 2012-05-26 06:20:23 -0700 | [diff] [blame] | 877 | fail_init_cprz: |
Anton Vorontsov | f4c5d24 | 2012-05-26 06:20:21 -0700 | [diff] [blame] | 878 | ramoops_free_przs(cxt); |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 879 | fail_out: |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 880 | return err; |
| 881 | } |
| 882 | |
Geliang Tang | ee1d267 | 2015-10-20 00:39:03 -0700 | [diff] [blame] | 883 | static int ramoops_remove(struct platform_device *pdev) |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 884 | { |
| 885 | struct ramoops_context *cxt = &oops_cxt; |
| 886 | |
Geliang Tang | ee1d267 | 2015-10-20 00:39:03 -0700 | [diff] [blame] | 887 | pstore_unregister(&cxt->pstore); |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 888 | |
Kees Cook | 9ba80d9 | 2012-05-03 15:45:02 +1000 | [diff] [blame] | 889 | kfree(cxt->pstore.buf); |
| 890 | cxt->pstore.bufsize = 0; |
| 891 | |
Geliang Tang | ee1d267 | 2015-10-20 00:39:03 -0700 | [diff] [blame] | 892 | persistent_ram_free(cxt->mprz); |
Geliang Tang | ee1d267 | 2015-10-20 00:39:03 -0700 | [diff] [blame] | 893 | persistent_ram_free(cxt->cprz); |
| 894 | ramoops_free_przs(cxt); |
| 895 | |
Kyungmin Park | c3b92ce | 2010-10-27 15:34:52 -0700 | [diff] [blame] | 896 | return 0; |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 897 | } |
| 898 | |
Greg Hackmann | 35da609 | 2016-01-07 15:40:56 -0800 | [diff] [blame] | 899 | static const struct of_device_id dt_match[] = { |
| 900 | { .compatible = "ramoops" }, |
| 901 | {} |
| 902 | }; |
| 903 | |
Kyungmin Park | c3b92ce | 2010-10-27 15:34:52 -0700 | [diff] [blame] | 904 | static struct platform_driver ramoops_driver = { |
Anton Vorontsov | 924d371 | 2012-06-18 19:15:50 -0700 | [diff] [blame] | 905 | .probe = ramoops_probe, |
Geliang Tang | ee1d267 | 2015-10-20 00:39:03 -0700 | [diff] [blame] | 906 | .remove = ramoops_remove, |
Kyungmin Park | c3b92ce | 2010-10-27 15:34:52 -0700 | [diff] [blame] | 907 | .driver = { |
Greg Hackmann | 35da609 | 2016-01-07 15:40:56 -0800 | [diff] [blame] | 908 | .name = "ramoops", |
| 909 | .of_match_table = dt_match, |
Kyungmin Park | c3b92ce | 2010-10-27 15:34:52 -0700 | [diff] [blame] | 910 | }, |
| 911 | }; |
| 912 | |
Anton Vorontsov | 924d371 | 2012-06-18 19:15:50 -0700 | [diff] [blame] | 913 | static void ramoops_register_dummy(void) |
Kyungmin Park | c3b92ce | 2010-10-27 15:34:52 -0700 | [diff] [blame] | 914 | { |
Anton Vorontsov | 924d371 | 2012-06-18 19:15:50 -0700 | [diff] [blame] | 915 | if (!mem_size) |
| 916 | return; |
Marco Stornelli | 13aefd7 | 2011-07-26 16:08:57 -0700 | [diff] [blame] | 917 | |
Anton Vorontsov | 924d371 | 2012-06-18 19:15:50 -0700 | [diff] [blame] | 918 | pr_info("using module parameters\n"); |
| 919 | |
| 920 | dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL); |
| 921 | if (!dummy_data) { |
| 922 | pr_info("could not allocate pdata\n"); |
| 923 | return; |
Marco Stornelli | 13aefd7 | 2011-07-26 16:08:57 -0700 | [diff] [blame] | 924 | } |
| 925 | |
Anton Vorontsov | 924d371 | 2012-06-18 19:15:50 -0700 | [diff] [blame] | 926 | dummy_data->mem_size = mem_size; |
| 927 | dummy_data->mem_address = mem_address; |
Wang Long | 0785505 | 2015-05-21 09:52:29 -0700 | [diff] [blame] | 928 | dummy_data->mem_type = mem_type; |
Anton Vorontsov | 924d371 | 2012-06-18 19:15:50 -0700 | [diff] [blame] | 929 | dummy_data->record_size = record_size; |
| 930 | dummy_data->console_size = ramoops_console_size; |
Anton Vorontsov | a694d1b | 2012-07-09 17:10:44 -0700 | [diff] [blame] | 931 | dummy_data->ftrace_size = ramoops_ftrace_size; |
Mark Salyzyn | 9d5438f | 2015-01-16 16:01:10 -0800 | [diff] [blame] | 932 | dummy_data->pmsg_size = ramoops_pmsg_size; |
Anton Vorontsov | 924d371 | 2012-06-18 19:15:50 -0700 | [diff] [blame] | 933 | dummy_data->dump_oops = dump_oops; |
Joel Fernandes | a1cf53a | 2016-10-20 00:34:04 -0700 | [diff] [blame] | 934 | dummy_data->flags = RAMOOPS_FLAG_FTRACE_PER_CPU; |
| 935 | |
Anton Vorontsov | 5ca5d4e | 2012-07-09 17:03:19 -0700 | [diff] [blame] | 936 | /* |
| 937 | * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC |
| 938 | * (using 1 byte for ECC isn't much of use anyway). |
| 939 | */ |
Arve Hjønnevåg | c31ad08 | 2012-05-22 16:33:23 -0700 | [diff] [blame] | 940 | dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc; |
Anton Vorontsov | 924d371 | 2012-06-18 19:15:50 -0700 | [diff] [blame] | 941 | |
| 942 | dummy = platform_device_register_data(NULL, "ramoops", -1, |
| 943 | dummy_data, sizeof(struct ramoops_platform_data)); |
| 944 | if (IS_ERR(dummy)) { |
| 945 | pr_info("could not create platform device: %ld\n", |
| 946 | PTR_ERR(dummy)); |
| 947 | } |
Kyungmin Park | c3b92ce | 2010-10-27 15:34:52 -0700 | [diff] [blame] | 948 | } |
| 949 | |
Anton Vorontsov | 924d371 | 2012-06-18 19:15:50 -0700 | [diff] [blame] | 950 | static int __init ramoops_init(void) |
| 951 | { |
| 952 | ramoops_register_dummy(); |
| 953 | return platform_driver_register(&ramoops_driver); |
| 954 | } |
| 955 | postcore_initcall(ramoops_init); |
| 956 | |
Kyungmin Park | c3b92ce | 2010-10-27 15:34:52 -0700 | [diff] [blame] | 957 | static void __exit ramoops_exit(void) |
| 958 | { |
| 959 | platform_driver_unregister(&ramoops_driver); |
Jovi Zhang | b4a871b | 2012-08-20 14:58:26 +0800 | [diff] [blame] | 960 | platform_device_unregister(dummy); |
Marco Stornelli | 13aefd7 | 2011-07-26 16:08:57 -0700 | [diff] [blame] | 961 | kfree(dummy_data); |
Kyungmin Park | c3b92ce | 2010-10-27 15:34:52 -0700 | [diff] [blame] | 962 | } |
Marco Stornelli | 56d611a | 2010-05-26 14:43:54 -0700 | [diff] [blame] | 963 | module_exit(ramoops_exit); |
| 964 | |
| 965 | MODULE_LICENSE("GPL"); |
| 966 | MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>"); |
| 967 | MODULE_DESCRIPTION("RAM Oops/Panic logger/driver"); |