Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright (C) 2011 The ChromiumOS Authors. All rights reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 14 | */ |
| 15 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 16 | #include <assert.h> |
Kyösti Mälkki | b766b1c | 2013-09-07 17:26:08 +0300 | [diff] [blame] | 17 | #include <stddef.h> |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 18 | #include <stdint.h> |
| 19 | #include <console/console.h> |
| 20 | #include <cbmem.h> |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 21 | #include <symbols.h> |
Aaron Durbin | 2daadf8 | 2015-05-01 16:48:54 -0500 | [diff] [blame] | 22 | #include <timer.h> |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 23 | #include <timestamp.h> |
Stefan Reinauer | fd4f413 | 2013-06-19 12:25:44 -0700 | [diff] [blame] | 24 | #include <arch/early_variables.h> |
Aaron Durbin | 2daadf8 | 2015-05-01 16:48:54 -0500 | [diff] [blame] | 25 | #include <rules.h> |
Kyösti Mälkki | 5a5c886 | 2014-01-26 14:41:54 +0200 | [diff] [blame] | 26 | #include <smp/node.h> |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 27 | |
Julius Werner | 69d20c4 | 2016-02-08 19:48:11 -0800 | [diff] [blame] | 28 | #define MAX_TIMESTAMPS 84 |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 29 | |
Julius Werner | 69d20c4 | 2016-02-08 19:48:11 -0800 | [diff] [blame] | 30 | #define MAX_BSS_TIMESTAMP_CACHE 16 |
Kyösti Mälkki | b766b1c | 2013-09-07 17:26:08 +0300 | [diff] [blame] | 31 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 32 | struct __attribute__((__packed__)) timestamp_cache { |
Aaron Durbin | bd1499d | 2015-07-10 01:51:14 -0500 | [diff] [blame] | 33 | uint32_t cache_state; |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 34 | struct timestamp_table table; |
| 35 | /* The struct timestamp_table has a 0 length array as its last field. |
| 36 | * The following 'entries' array serves as the storage space for the |
Julius Werner | 69d20c4 | 2016-02-08 19:48:11 -0800 | [diff] [blame] | 37 | * cache when allocated in the BSS. */ |
| 38 | struct timestamp_entry entries[MAX_BSS_TIMESTAMP_CACHE]; |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 39 | }; |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 40 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 41 | #if (IS_ENABLED(CONFIG_HAS_PRECBMEM_TIMESTAMP_REGION) && defined(__PRE_RAM__)) |
| 42 | #define USE_TIMESTAMP_REGION 1 |
| 43 | #else |
| 44 | #define USE_TIMESTAMP_REGION 0 |
| 45 | #endif |
| 46 | |
| 47 | /* The cache location will sit in BSS when in ramstage. */ |
| 48 | #define TIMESTAMP_CACHE_IN_BSS ENV_RAMSTAGE |
| 49 | |
| 50 | #define HAS_CBMEM (ENV_ROMSTAGE || ENV_RAMSTAGE) |
| 51 | |
| 52 | /* Storage of cache entries during ramstage prior to cbmem coming online. */ |
| 53 | static struct timestamp_cache timestamp_cache; |
| 54 | |
| 55 | enum { |
| 56 | TIMESTAMP_CACHE_UNINITIALIZED = 0, |
| 57 | TIMESTAMP_CACHE_INITIALIZED, |
| 58 | TIMESTAMP_CACHE_NOT_NEEDED, |
| 59 | }; |
| 60 | |
| 61 | static void timestamp_cache_init(struct timestamp_cache *ts_cache, |
| 62 | uint64_t base) |
| 63 | { |
| 64 | ts_cache->table.num_entries = 0; |
Julius Werner | 69d20c4 | 2016-02-08 19:48:11 -0800 | [diff] [blame] | 65 | ts_cache->table.max_entries = MAX_BSS_TIMESTAMP_CACHE; |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 66 | ts_cache->table.base_time = base; |
| 67 | ts_cache->cache_state = TIMESTAMP_CACHE_INITIALIZED; |
Julius Werner | 69d20c4 | 2016-02-08 19:48:11 -0800 | [diff] [blame] | 68 | |
| 69 | if (USE_TIMESTAMP_REGION) |
| 70 | ts_cache->table.max_entries = (_timestamp_size - |
| 71 | offsetof(struct timestamp_cache, entries)) |
| 72 | / sizeof(struct timestamp_entry); |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 73 | } |
| 74 | |
| 75 | static struct timestamp_cache *timestamp_cache_get(void) |
| 76 | { |
| 77 | struct timestamp_cache *ts_cache = NULL; |
| 78 | |
| 79 | if (TIMESTAMP_CACHE_IN_BSS) { |
| 80 | ts_cache = ×tamp_cache; |
| 81 | } else if (USE_TIMESTAMP_REGION) { |
| 82 | if (_timestamp_size < sizeof(*ts_cache)) |
| 83 | BUG(); |
| 84 | ts_cache = car_get_var_ptr((void *)_timestamp); |
| 85 | } |
| 86 | |
| 87 | if (ts_cache && ts_cache->cache_state == TIMESTAMP_CACHE_UNINITIALIZED) |
| 88 | timestamp_cache_init(ts_cache, 0); |
| 89 | |
| 90 | return ts_cache; |
| 91 | } |
| 92 | |
| 93 | static struct timestamp_table *timestamp_alloc_cbmem_table(void) |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 94 | { |
| 95 | struct timestamp_table* tst; |
| 96 | |
| 97 | tst = cbmem_add(CBMEM_ID_TIMESTAMP, |
| 98 | sizeof(struct timestamp_table) + |
| 99 | MAX_TIMESTAMPS * sizeof(struct timestamp_entry)); |
| 100 | |
Kyösti Mälkki | e034417 | 2015-05-26 06:23:02 +0300 | [diff] [blame] | 101 | if (!tst) |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 102 | return NULL; |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 103 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 104 | tst->base_time = 0; |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 105 | tst->max_entries = MAX_TIMESTAMPS; |
| 106 | tst->num_entries = 0; |
Kyösti Mälkki | b766b1c | 2013-09-07 17:26:08 +0300 | [diff] [blame] | 107 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 108 | return tst; |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 109 | } |
| 110 | |
Aaron Durbin | 2daadf8 | 2015-05-01 16:48:54 -0500 | [diff] [blame] | 111 | /* Determine if one should proceed into timestamp code. This is for protecting |
| 112 | * systems that have multiple processors running in romstage -- namely AMD |
| 113 | * based x86 platforms. */ |
| 114 | static int timestamp_should_run(void) |
| 115 | { |
| 116 | /* Only check boot_cpu() in other stages than ramstage on x86. */ |
| 117 | if ((!ENV_RAMSTAGE && IS_ENABLED(CONFIG_ARCH_X86)) && !boot_cpu()) |
| 118 | return 0; |
| 119 | |
| 120 | return 1; |
| 121 | } |
| 122 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 123 | static struct timestamp_table *timestamp_table_get(void) |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 124 | { |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 125 | MAYBE_STATIC struct timestamp_table *ts_table = NULL; |
| 126 | struct timestamp_cache *ts_cache; |
Kyösti Mälkki | b766b1c | 2013-09-07 17:26:08 +0300 | [diff] [blame] | 127 | |
Aaron Durbin | 2daadf8 | 2015-05-01 16:48:54 -0500 | [diff] [blame] | 128 | if (!timestamp_should_run()) |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 129 | return NULL; |
Kyösti Mälkki | f56ff90 | 2013-09-08 13:10:28 +0300 | [diff] [blame] | 130 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 131 | if (ts_table != NULL) |
| 132 | return ts_table; |
| 133 | |
| 134 | ts_cache = timestamp_cache_get(); |
| 135 | |
| 136 | if (ts_cache == NULL) { |
| 137 | if (HAS_CBMEM) |
| 138 | ts_table = cbmem_find(CBMEM_ID_TIMESTAMP); |
| 139 | return ts_table; |
| 140 | } |
| 141 | |
| 142 | /* Cache is required. */ |
| 143 | if (ts_cache->cache_state != TIMESTAMP_CACHE_NOT_NEEDED) |
| 144 | return &ts_cache->table; |
| 145 | |
| 146 | /* Cache shouldn't be used but there's no backing store. */ |
| 147 | if (!HAS_CBMEM) |
| 148 | return NULL; |
| 149 | |
| 150 | ts_table = cbmem_find(CBMEM_ID_TIMESTAMP); |
| 151 | |
| 152 | return ts_table; |
| 153 | } |
| 154 | |
| 155 | static void timestamp_add_table_entry(struct timestamp_table *ts_table, |
| 156 | enum timestamp_id id, uint64_t ts_time) |
| 157 | { |
| 158 | struct timestamp_entry *tse; |
| 159 | |
Ben Gardner | f5fd4c9 | 2015-11-20 13:25:25 -0600 | [diff] [blame] | 160 | if (ts_table->num_entries >= ts_table->max_entries) |
Kyösti Mälkki | b766b1c | 2013-09-07 17:26:08 +0300 | [diff] [blame] | 161 | return; |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 162 | |
| 163 | tse = &ts_table->entries[ts_table->num_entries++]; |
| 164 | tse->entry_id = id; |
Stefan Reinauer | 3a6550d | 2013-08-01 13:31:44 -0700 | [diff] [blame] | 165 | tse->entry_stamp = ts_time - ts_table->base_time; |
Ben Gardner | f5fd4c9 | 2015-11-20 13:25:25 -0600 | [diff] [blame] | 166 | |
| 167 | if (ts_table->num_entries == ts_table->max_entries) |
| 168 | printk(BIOS_ERR, "ERROR: Timestamp table full\n"); |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 169 | } |
| 170 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 171 | void timestamp_add(enum timestamp_id id, uint64_t ts_time) |
| 172 | { |
| 173 | struct timestamp_table *ts_table; |
| 174 | |
| 175 | ts_table = timestamp_table_get(); |
| 176 | |
| 177 | if (!ts_table) { |
| 178 | printk(BIOS_ERR, "ERROR: No timestamp table found\n"); |
| 179 | return; |
| 180 | } |
| 181 | |
| 182 | timestamp_add_table_entry(ts_table, id, ts_time); |
| 183 | } |
| 184 | |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 185 | void timestamp_add_now(enum timestamp_id id) |
| 186 | { |
Stefan Reinauer | 3a6550d | 2013-08-01 13:31:44 -0700 | [diff] [blame] | 187 | timestamp_add(id, timestamp_get()); |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 188 | } |
Stefan Reinauer | 4221a19 | 2012-10-15 15:23:20 -0700 | [diff] [blame] | 189 | |
Stefan Reinauer | 3a6550d | 2013-08-01 13:31:44 -0700 | [diff] [blame] | 190 | void timestamp_init(uint64_t base) |
Kyösti Mälkki | b766b1c | 2013-09-07 17:26:08 +0300 | [diff] [blame] | 191 | { |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 192 | struct timestamp_cache *ts_cache; |
| 193 | |
Aaron Durbin | 2daadf8 | 2015-05-01 16:48:54 -0500 | [diff] [blame] | 194 | if (!timestamp_should_run()) |
Kyösti Mälkki | f56ff90 | 2013-09-08 13:10:28 +0300 | [diff] [blame] | 195 | return; |
| 196 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 197 | ts_cache = timestamp_cache_get(); |
Kyösti Mälkki | b766b1c | 2013-09-07 17:26:08 +0300 | [diff] [blame] | 198 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 199 | if (!ts_cache) { |
| 200 | printk(BIOS_ERR, "ERROR: No timestamp cache to init\n"); |
Kyösti Mälkki | b766b1c | 2013-09-07 17:26:08 +0300 | [diff] [blame] | 201 | return; |
| 202 | } |
Kyösti Mälkki | b766b1c | 2013-09-07 17:26:08 +0300 | [diff] [blame] | 203 | |
Aaron Durbin | bd1499d | 2015-07-10 01:51:14 -0500 | [diff] [blame] | 204 | /* In the EARLY_CBMEM_INIT case timestamps could have already been |
| 205 | * recovered. In those circumstances honor the cache which sits in BSS |
| 206 | * as it has already been initialized. */ |
Aaron Durbin | 2a983bd | 2015-07-11 13:36:01 -0500 | [diff] [blame] | 207 | if (ENV_RAMSTAGE && IS_ENABLED(CONFIG_EARLY_CBMEM_INIT) && |
Aaron Durbin | bd1499d | 2015-07-10 01:51:14 -0500 | [diff] [blame] | 208 | ts_cache->cache_state != TIMESTAMP_CACHE_UNINITIALIZED) |
| 209 | return; |
| 210 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 211 | timestamp_cache_init(ts_cache, base); |
Kyösti Mälkki | b766b1c | 2013-09-07 17:26:08 +0300 | [diff] [blame] | 212 | } |
| 213 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 214 | static void timestamp_sync_cache_to_cbmem(int is_recovery) |
Kyösti Mälkki | b766b1c | 2013-09-07 17:26:08 +0300 | [diff] [blame] | 215 | { |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 216 | uint32_t i; |
| 217 | struct timestamp_cache *ts_cache; |
| 218 | struct timestamp_table *ts_cache_table; |
| 219 | struct timestamp_table *ts_cbmem_table = NULL; |
| 220 | |
Aaron Durbin | 2daadf8 | 2015-05-01 16:48:54 -0500 | [diff] [blame] | 221 | if (!timestamp_should_run()) |
Kyösti Mälkki | f56ff90 | 2013-09-08 13:10:28 +0300 | [diff] [blame] | 222 | return; |
| 223 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 224 | ts_cache = timestamp_cache_get(); |
| 225 | |
| 226 | /* No timestamp cache found */ |
| 227 | if (ts_cache == NULL) { |
| 228 | printk(BIOS_ERR, "ERROR: No timestamp cache found\n"); |
| 229 | return; |
| 230 | } |
| 231 | |
| 232 | ts_cache_table = &ts_cache->table; |
| 233 | |
| 234 | /* cbmem is being recovered. */ |
| 235 | if (is_recovery) { |
| 236 | /* x86 resume path expects timestamps to be reset. */ |
| 237 | if (IS_ENABLED(CONFIG_ARCH_ROMSTAGE_X86_32) && ENV_ROMSTAGE) |
| 238 | ts_cbmem_table = timestamp_alloc_cbmem_table(); |
| 239 | else { |
| 240 | /* Find existing table in cbmem. */ |
| 241 | ts_cbmem_table = cbmem_find(CBMEM_ID_TIMESTAMP); |
| 242 | /* No existing timestamp table. */ |
| 243 | if (ts_cbmem_table == NULL) |
| 244 | ts_cbmem_table = timestamp_alloc_cbmem_table(); |
| 245 | } |
| 246 | } else |
| 247 | /* First time sync. Add new table. */ |
| 248 | ts_cbmem_table = timestamp_alloc_cbmem_table(); |
| 249 | |
| 250 | if (ts_cbmem_table == NULL) { |
| 251 | printk(BIOS_ERR, "ERROR: No timestamp table allocated\n"); |
| 252 | return; |
| 253 | } |
| 254 | |
| 255 | /* |
| 256 | * There's no need to worry about the base_time fields being out of |
| 257 | * sync because the following configurations are used/supported: |
| 258 | * |
| 259 | * 1. CONFIG_HAS_PRECBMEM_TIMESTAMP_REGION is enabled. This |
| 260 | * implies CONFIG_EARLY_CBMEM_INIT so once cbmem comes |
| 261 | * online we sync the timestamps to the cbmem storage while |
| 262 | * running in romstage. In ramstage the cbmem area is |
| 263 | * recovered and utilized. |
| 264 | * |
| 265 | * 2. CONFIG_LATE_CBMEM_INIT (!CONFIG_EARLY_CBMEM_INIT) is |
| 266 | * being used. That means the only cache that exists is |
| 267 | * in ramstage. Once cbmem comes online in ramstage those |
| 268 | * values are sync'd over. |
| 269 | * |
| 270 | * Any other combinations will result in inconsistent base_time |
| 271 | * values including bizarre timestamp values. |
| 272 | */ |
| 273 | for (i = 0; i < ts_cache_table->num_entries; i++) { |
| 274 | struct timestamp_entry *tse = &ts_cache_table->entries[i]; |
| 275 | timestamp_add_table_entry(ts_cbmem_table, tse->entry_id, |
| 276 | tse->entry_stamp); |
| 277 | } |
| 278 | |
| 279 | /* Freshly added cbmem table has base_time 0. Inherit cache base_time */ |
| 280 | if (ts_cbmem_table->base_time == 0) |
| 281 | ts_cbmem_table->base_time = ts_cache_table->base_time; |
| 282 | |
Aaron Durbin | c49014e | 2015-08-30 21:19:55 -0500 | [diff] [blame] | 283 | /* Seed the timestamp tick frequency in ramstage. */ |
| 284 | if (ENV_RAMSTAGE) |
| 285 | ts_cbmem_table->tick_freq_mhz = timestamp_tick_freq_mhz(); |
| 286 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 287 | /* Cache no longer required. */ |
| 288 | ts_cache_table->num_entries = 0; |
| 289 | ts_cache->cache_state = TIMESTAMP_CACHE_NOT_NEEDED; |
Kyösti Mälkki | 3d45c40 | 2013-09-07 20:26:36 +0300 | [diff] [blame] | 290 | } |
Kyösti Mälkki | cbf5bdf | 2013-09-10 00:07:21 +0300 | [diff] [blame] | 291 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 292 | ROMSTAGE_CBMEM_INIT_HOOK(timestamp_sync_cache_to_cbmem) |
| 293 | RAMSTAGE_CBMEM_INIT_HOOK(timestamp_sync_cache_to_cbmem) |
Aaron Durbin | 9e80e27 | 2015-05-01 16:48:54 -0500 | [diff] [blame] | 294 | |
| 295 | /* Provide default timestamp implementation using monotonic timer. */ |
| 296 | uint64_t __attribute__((weak)) timestamp_get(void) |
| 297 | { |
| 298 | struct mono_time t1, t2; |
| 299 | |
Aaron Durbin | 7aafe53 | 2015-05-07 11:32:30 -0500 | [diff] [blame] | 300 | if (!IS_ENABLED(CONFIG_HAVE_MONOTONIC_TIMER)) |
| 301 | return 0; |
| 302 | |
Aaron Durbin | 9e80e27 | 2015-05-01 16:48:54 -0500 | [diff] [blame] | 303 | mono_time_set_usecs(&t1, 0); |
| 304 | timer_monotonic_get(&t2); |
| 305 | |
| 306 | return mono_time_diff_microseconds(&t1, &t2); |
| 307 | } |
Aaron Durbin | c49014e | 2015-08-30 21:19:55 -0500 | [diff] [blame] | 308 | |
| 309 | /* Like timestamp_get() above this matches up with microsecond granularity. */ |
| 310 | int __attribute__((weak)) timestamp_tick_freq_mhz(void) |
| 311 | { |
| 312 | return 1; |
| 313 | } |