Hari Bathini | 41df592 | 2019-09-11 20:20:26 +0530 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | /* |
| 3 | * Firmware-Assisted Dump support on POWER platform (OPAL). |
| 4 | * |
| 5 | * Copyright 2019, Hari Bathini, IBM Corporation. |
| 6 | */ |
| 7 | |
| 8 | #define pr_fmt(fmt) "opal fadump: " fmt |
| 9 | |
| 10 | #include <linux/string.h> |
| 11 | #include <linux/seq_file.h> |
Hari Bathini | 7b1b3b4 | 2019-09-11 20:26:59 +0530 | [diff] [blame] | 12 | #include <linux/of.h> |
Hari Bathini | 41df592 | 2019-09-11 20:20:26 +0530 | [diff] [blame] | 13 | #include <linux/of_fdt.h> |
| 14 | #include <linux/libfdt.h> |
Hari Bathini | 742a265 | 2019-09-11 20:20:57 +0530 | [diff] [blame] | 15 | #include <linux/mm.h> |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 16 | #include <linux/crash_dump.h> |
Hari Bathini | 41df592 | 2019-09-11 20:20:26 +0530 | [diff] [blame] | 17 | |
Hari Bathini | 742a265 | 2019-09-11 20:20:57 +0530 | [diff] [blame] | 18 | #include <asm/page.h> |
Hari Bathini | 41df592 | 2019-09-11 20:20:26 +0530 | [diff] [blame] | 19 | #include <asm/opal.h> |
| 20 | #include <asm/fadump-internal.h> |
| 21 | |
Hari Bathini | 742a265 | 2019-09-11 20:20:57 +0530 | [diff] [blame] | 22 | #include "opal-fadump.h" |
| 23 | |
Hari Bathini | bec5319 | 2019-09-11 20:26:03 +0530 | [diff] [blame] | 24 | |
| 25 | #ifdef CONFIG_PRESERVE_FA_DUMP |
| 26 | /* |
| 27 | * When dump is active but PRESERVE_FA_DUMP is enabled on the kernel, |
| 28 | * ensure crash data is preserved in hope that the subsequent memory |
| 29 | * preserving kernel boot is going to process this crash data. |
| 30 | */ |
| 31 | void __init opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node) |
| 32 | { |
| 33 | const struct opal_fadump_mem_struct *opal_fdm_active; |
| 34 | const __be32 *prop; |
| 35 | unsigned long dn; |
| 36 | u64 addr = 0; |
| 37 | s64 ret; |
| 38 | |
| 39 | dn = of_get_flat_dt_subnode_by_name(node, "dump"); |
| 40 | if (dn == -FDT_ERR_NOTFOUND) |
| 41 | return; |
| 42 | |
| 43 | /* |
| 44 | * Check if dump has been initiated on last reboot. |
| 45 | */ |
| 46 | prop = of_get_flat_dt_prop(dn, "mpipl-boot", NULL); |
| 47 | if (!prop) |
| 48 | return; |
| 49 | |
| 50 | ret = opal_mpipl_query_tag(OPAL_MPIPL_TAG_KERNEL, &addr); |
| 51 | if ((ret != OPAL_SUCCESS) || !addr) { |
| 52 | pr_debug("Could not get Kernel metadata (%lld)\n", ret); |
| 53 | return; |
| 54 | } |
| 55 | |
| 56 | /* |
| 57 | * Preserve memory only if kernel memory regions are registered |
| 58 | * with f/w for MPIPL. |
| 59 | */ |
| 60 | addr = be64_to_cpu(addr); |
| 61 | pr_debug("Kernel metadata addr: %llx\n", addr); |
| 62 | opal_fdm_active = (void *)addr; |
| 63 | if (opal_fdm_active->registered_regions == 0) |
| 64 | return; |
| 65 | |
| 66 | ret = opal_mpipl_query_tag(OPAL_MPIPL_TAG_BOOT_MEM, &addr); |
| 67 | if ((ret != OPAL_SUCCESS) || !addr) { |
| 68 | pr_err("Failed to get boot memory tag (%lld)\n", ret); |
| 69 | return; |
| 70 | } |
| 71 | |
| 72 | /* |
| 73 | * Memory below this address can be used for booting a |
| 74 | * capture kernel or petitboot kernel. Preserve everything |
| 75 | * above this address for processing crashdump. |
| 76 | */ |
| 77 | fadump_conf->boot_mem_top = be64_to_cpu(addr); |
| 78 | pr_debug("Preserve everything above %llx\n", fadump_conf->boot_mem_top); |
| 79 | |
| 80 | pr_info("Firmware-assisted dump is active.\n"); |
| 81 | fadump_conf->dump_active = 1; |
| 82 | } |
| 83 | |
| 84 | #else /* CONFIG_PRESERVE_FA_DUMP */ |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 85 | static const struct opal_fadump_mem_struct *opal_fdm_active; |
Hari Bathini | 5000a17 | 2019-09-11 20:24:50 +0530 | [diff] [blame] | 86 | static const struct opal_mpipl_fadump *opal_cpu_metadata; |
Hari Bathini | 742a265 | 2019-09-11 20:20:57 +0530 | [diff] [blame] | 87 | static struct opal_fadump_mem_struct *opal_fdm; |
| 88 | |
Hari Bathini | 6f713d1 | 2019-09-11 20:26:33 +0530 | [diff] [blame] | 89 | #ifdef CONFIG_OPAL_CORE |
| 90 | extern bool kernel_initiated; |
| 91 | #endif |
| 92 | |
Hari Bathini | a20a8fa | 2019-09-11 20:21:33 +0530 | [diff] [blame] | 93 | static int opal_fadump_unregister(struct fw_dump *fadump_conf); |
| 94 | |
| 95 | static void opal_fadump_update_config(struct fw_dump *fadump_conf, |
| 96 | const struct opal_fadump_mem_struct *fdm) |
| 97 | { |
Hari Bathini | 51bba8e | 2019-09-11 20:21:46 +0530 | [diff] [blame] | 98 | pr_debug("Boot memory regions count: %d\n", fdm->region_cnt); |
| 99 | |
Hari Bathini | a20a8fa | 2019-09-11 20:21:33 +0530 | [diff] [blame] | 100 | /* |
| 101 | * The destination address of the first boot memory region is the |
| 102 | * destination address of boot memory regions. |
| 103 | */ |
| 104 | fadump_conf->boot_mem_dest_addr = fdm->rgn[0].dest; |
| 105 | pr_debug("Destination address of boot memory regions: %#016llx\n", |
| 106 | fadump_conf->boot_mem_dest_addr); |
| 107 | |
| 108 | fadump_conf->fadumphdr_addr = fdm->fadumphdr_addr; |
| 109 | } |
| 110 | |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 111 | /* |
| 112 | * This function is called in the capture kernel to get configuration details |
| 113 | * from metadata setup by the first kernel. |
| 114 | */ |
Nick Child | e5913db | 2021-12-16 17:00:26 -0500 | [diff] [blame] | 115 | static void __init opal_fadump_get_config(struct fw_dump *fadump_conf, |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 116 | const struct opal_fadump_mem_struct *fdm) |
| 117 | { |
Hari Bathini | 7dee93a | 2019-09-11 20:27:39 +0530 | [diff] [blame] | 118 | unsigned long base, size, last_end, hole_size; |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 119 | int i; |
| 120 | |
| 121 | if (!fadump_conf->dump_active) |
| 122 | return; |
| 123 | |
Hari Bathini | 7dee93a | 2019-09-11 20:27:39 +0530 | [diff] [blame] | 124 | last_end = 0; |
| 125 | hole_size = 0; |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 126 | fadump_conf->boot_memory_size = 0; |
| 127 | |
| 128 | pr_debug("Boot memory regions:\n"); |
| 129 | for (i = 0; i < fdm->region_cnt; i++) { |
Hari Bathini | 7dee93a | 2019-09-11 20:27:39 +0530 | [diff] [blame] | 130 | base = fdm->rgn[i].src; |
| 131 | size = fdm->rgn[i].size; |
| 132 | pr_debug("\t[%03d] base: 0x%lx, size: 0x%lx\n", i, base, size); |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 133 | |
Hari Bathini | 7dee93a | 2019-09-11 20:27:39 +0530 | [diff] [blame] | 134 | fadump_conf->boot_mem_addr[i] = base; |
| 135 | fadump_conf->boot_mem_sz[i] = size; |
| 136 | fadump_conf->boot_memory_size += size; |
| 137 | hole_size += (base - last_end); |
| 138 | |
| 139 | last_end = base + size; |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 140 | } |
| 141 | |
| 142 | /* |
| 143 | * Start address of reserve dump area (permanent reservation) for |
| 144 | * re-registering FADump after dump capture. |
| 145 | */ |
| 146 | fadump_conf->reserve_dump_area_start = fdm->rgn[0].dest; |
| 147 | |
Hari Bathini | 6071e8f | 2019-09-11 20:22:32 +0530 | [diff] [blame] | 148 | /* |
| 149 | * Rarely, but it can so happen that system crashes before all |
| 150 | * boot memory regions are registered for MPIPL. In such |
| 151 | * cases, warn that the vmcore may not be accurate and proceed |
| 152 | * anyway as that is the best bet considering free pages, cache |
| 153 | * pages, user pages, etc are usually filtered out. |
| 154 | * |
| 155 | * Hope the memory that could not be preserved only has pages |
| 156 | * that are usually filtered out while saving the vmcore. |
| 157 | */ |
| 158 | if (fdm->region_cnt > fdm->registered_regions) { |
| 159 | pr_warn("Not all memory regions were saved!!!\n"); |
| 160 | pr_warn(" Unsaved memory regions:\n"); |
| 161 | i = fdm->registered_regions; |
| 162 | while (i < fdm->region_cnt) { |
| 163 | pr_warn("\t[%03d] base: 0x%llx, size: 0x%llx\n", |
| 164 | i, fdm->rgn[i].src, fdm->rgn[i].size); |
| 165 | i++; |
| 166 | } |
| 167 | |
| 168 | pr_warn("If the unsaved regions only contain pages that are filtered out (eg. free/user pages), the vmcore should still be usable.\n"); |
| 169 | pr_warn("WARNING: If the unsaved regions contain kernel pages, the vmcore will be corrupted.\n"); |
| 170 | } |
| 171 | |
Hari Bathini | 7dee93a | 2019-09-11 20:27:39 +0530 | [diff] [blame] | 172 | fadump_conf->boot_mem_top = (fadump_conf->boot_memory_size + hole_size); |
| 173 | fadump_conf->boot_mem_regs_cnt = fdm->region_cnt; |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 174 | opal_fadump_update_config(fadump_conf, fdm); |
| 175 | } |
| 176 | |
Hari Bathini | 742a265 | 2019-09-11 20:20:57 +0530 | [diff] [blame] | 177 | /* Initialize kernel metadata */ |
| 178 | static void opal_fadump_init_metadata(struct opal_fadump_mem_struct *fdm) |
| 179 | { |
| 180 | fdm->version = OPAL_FADUMP_VERSION; |
| 181 | fdm->region_cnt = 0; |
| 182 | fdm->registered_regions = 0; |
| 183 | fdm->fadumphdr_addr = 0; |
| 184 | } |
| 185 | |
Hari Bathini | 41df592 | 2019-09-11 20:20:26 +0530 | [diff] [blame] | 186 | static u64 opal_fadump_init_mem_struct(struct fw_dump *fadump_conf) |
| 187 | { |
Hari Bathini | 7dee93a | 2019-09-11 20:27:39 +0530 | [diff] [blame] | 188 | u64 addr = fadump_conf->reserve_dump_area_start; |
| 189 | int i; |
Hari Bathini | 742a265 | 2019-09-11 20:20:57 +0530 | [diff] [blame] | 190 | |
| 191 | opal_fdm = __va(fadump_conf->kernel_metadata); |
| 192 | opal_fadump_init_metadata(opal_fdm); |
| 193 | |
Hari Bathini | 51bba8e | 2019-09-11 20:21:46 +0530 | [diff] [blame] | 194 | /* Boot memory regions */ |
Hari Bathini | 7dee93a | 2019-09-11 20:27:39 +0530 | [diff] [blame] | 195 | for (i = 0; i < fadump_conf->boot_mem_regs_cnt; i++) { |
| 196 | opal_fdm->rgn[i].src = fadump_conf->boot_mem_addr[i]; |
| 197 | opal_fdm->rgn[i].dest = addr; |
| 198 | opal_fdm->rgn[i].size = fadump_conf->boot_mem_sz[i]; |
Hari Bathini | 51bba8e | 2019-09-11 20:21:46 +0530 | [diff] [blame] | 199 | |
| 200 | opal_fdm->region_cnt++; |
Hari Bathini | 7dee93a | 2019-09-11 20:27:39 +0530 | [diff] [blame] | 201 | addr += fadump_conf->boot_mem_sz[i]; |
Hari Bathini | 51bba8e | 2019-09-11 20:21:46 +0530 | [diff] [blame] | 202 | } |
Hari Bathini | 742a265 | 2019-09-11 20:20:57 +0530 | [diff] [blame] | 203 | |
| 204 | /* |
| 205 | * Kernel metadata is passed to f/w and retrieved in capture kerenl. |
| 206 | * So, use it to save fadump header address instead of calculating it. |
| 207 | */ |
| 208 | opal_fdm->fadumphdr_addr = (opal_fdm->rgn[0].dest + |
| 209 | fadump_conf->boot_memory_size); |
| 210 | |
Hari Bathini | a20a8fa | 2019-09-11 20:21:33 +0530 | [diff] [blame] | 211 | opal_fadump_update_config(fadump_conf, opal_fdm); |
| 212 | |
Hari Bathini | 7dee93a | 2019-09-11 20:27:39 +0530 | [diff] [blame] | 213 | return addr; |
Hari Bathini | 742a265 | 2019-09-11 20:20:57 +0530 | [diff] [blame] | 214 | } |
| 215 | |
| 216 | static u64 opal_fadump_get_metadata_size(void) |
| 217 | { |
| 218 | return PAGE_ALIGN(sizeof(struct opal_fadump_mem_struct)); |
| 219 | } |
| 220 | |
| 221 | static int opal_fadump_setup_metadata(struct fw_dump *fadump_conf) |
| 222 | { |
| 223 | int err = 0; |
| 224 | s64 ret; |
| 225 | |
| 226 | /* |
| 227 | * Use the last page(s) in FADump memory reservation for |
| 228 | * kernel metadata. |
| 229 | */ |
| 230 | fadump_conf->kernel_metadata = (fadump_conf->reserve_dump_area_start + |
| 231 | fadump_conf->reserve_dump_area_size - |
| 232 | opal_fadump_get_metadata_size()); |
| 233 | pr_info("Kernel metadata addr: %llx\n", fadump_conf->kernel_metadata); |
| 234 | |
| 235 | /* Initialize kernel metadata before registering the address with f/w */ |
| 236 | opal_fdm = __va(fadump_conf->kernel_metadata); |
| 237 | opal_fadump_init_metadata(opal_fdm); |
| 238 | |
| 239 | /* |
| 240 | * Register metadata address with f/w. Can be retrieved in |
| 241 | * the capture kernel. |
| 242 | */ |
| 243 | ret = opal_mpipl_register_tag(OPAL_MPIPL_TAG_KERNEL, |
| 244 | fadump_conf->kernel_metadata); |
| 245 | if (ret != OPAL_SUCCESS) { |
| 246 | pr_err("Failed to set kernel metadata tag!\n"); |
| 247 | err = -EPERM; |
| 248 | } |
| 249 | |
Hari Bathini | bec5319 | 2019-09-11 20:26:03 +0530 | [diff] [blame] | 250 | /* |
| 251 | * Register boot memory top address with f/w. Should be retrieved |
| 252 | * by a kernel that intends to preserve crash'ed kernel's memory. |
| 253 | */ |
| 254 | ret = opal_mpipl_register_tag(OPAL_MPIPL_TAG_BOOT_MEM, |
Hari Bathini | 7dee93a | 2019-09-11 20:27:39 +0530 | [diff] [blame] | 255 | fadump_conf->boot_mem_top); |
Hari Bathini | bec5319 | 2019-09-11 20:26:03 +0530 | [diff] [blame] | 256 | if (ret != OPAL_SUCCESS) { |
| 257 | pr_err("Failed to set boot memory tag!\n"); |
| 258 | err = -EPERM; |
| 259 | } |
| 260 | |
Hari Bathini | 742a265 | 2019-09-11 20:20:57 +0530 | [diff] [blame] | 261 | return err; |
Hari Bathini | 41df592 | 2019-09-11 20:20:26 +0530 | [diff] [blame] | 262 | } |
| 263 | |
Hari Bathini | 7b1b3b4 | 2019-09-11 20:26:59 +0530 | [diff] [blame] | 264 | static u64 opal_fadump_get_bootmem_min(void) |
| 265 | { |
| 266 | return OPAL_FADUMP_MIN_BOOT_MEM; |
| 267 | } |
| 268 | |
Hari Bathini | 41df592 | 2019-09-11 20:20:26 +0530 | [diff] [blame] | 269 | static int opal_fadump_register(struct fw_dump *fadump_conf) |
| 270 | { |
Hari Bathini | a20a8fa | 2019-09-11 20:21:33 +0530 | [diff] [blame] | 271 | s64 rc = OPAL_PARAMETER; |
| 272 | int i, err = -EIO; |
| 273 | |
| 274 | for (i = 0; i < opal_fdm->region_cnt; i++) { |
| 275 | rc = opal_mpipl_update(OPAL_MPIPL_ADD_RANGE, |
| 276 | opal_fdm->rgn[i].src, |
| 277 | opal_fdm->rgn[i].dest, |
| 278 | opal_fdm->rgn[i].size); |
| 279 | if (rc != OPAL_SUCCESS) |
| 280 | break; |
| 281 | |
| 282 | opal_fdm->registered_regions++; |
| 283 | } |
| 284 | |
| 285 | switch (rc) { |
| 286 | case OPAL_SUCCESS: |
| 287 | pr_info("Registration is successful!\n"); |
| 288 | fadump_conf->dump_registered = 1; |
| 289 | err = 0; |
| 290 | break; |
| 291 | case OPAL_RESOURCE: |
| 292 | /* If MAX regions limit in f/w is hit, warn and proceed. */ |
| 293 | pr_warn("%d regions could not be registered for MPIPL as MAX limit is reached!\n", |
| 294 | (opal_fdm->region_cnt - opal_fdm->registered_regions)); |
| 295 | fadump_conf->dump_registered = 1; |
| 296 | err = 0; |
| 297 | break; |
| 298 | case OPAL_PARAMETER: |
| 299 | pr_err("Failed to register. Parameter Error(%lld).\n", rc); |
| 300 | break; |
| 301 | case OPAL_HARDWARE: |
| 302 | pr_err("Support not available.\n"); |
| 303 | fadump_conf->fadump_supported = 0; |
| 304 | fadump_conf->fadump_enabled = 0; |
| 305 | break; |
| 306 | default: |
| 307 | pr_err("Failed to register. Unknown Error(%lld).\n", rc); |
| 308 | break; |
| 309 | } |
| 310 | |
| 311 | /* |
| 312 | * If some regions were registered before OPAL_MPIPL_ADD_RANGE |
| 313 | * OPAL call failed, unregister all regions. |
| 314 | */ |
| 315 | if ((err < 0) && (opal_fdm->registered_regions > 0)) |
| 316 | opal_fadump_unregister(fadump_conf); |
| 317 | |
| 318 | return err; |
Hari Bathini | 41df592 | 2019-09-11 20:20:26 +0530 | [diff] [blame] | 319 | } |
| 320 | |
| 321 | static int opal_fadump_unregister(struct fw_dump *fadump_conf) |
| 322 | { |
Hari Bathini | a20a8fa | 2019-09-11 20:21:33 +0530 | [diff] [blame] | 323 | s64 rc; |
| 324 | |
| 325 | rc = opal_mpipl_update(OPAL_MPIPL_REMOVE_ALL, 0, 0, 0); |
| 326 | if (rc) { |
| 327 | pr_err("Failed to un-register - unexpected Error(%lld).\n", rc); |
| 328 | return -EIO; |
| 329 | } |
| 330 | |
| 331 | opal_fdm->registered_regions = 0; |
| 332 | fadump_conf->dump_registered = 0; |
| 333 | return 0; |
Hari Bathini | 41df592 | 2019-09-11 20:20:26 +0530 | [diff] [blame] | 334 | } |
| 335 | |
| 336 | static int opal_fadump_invalidate(struct fw_dump *fadump_conf) |
| 337 | { |
Hari Bathini | a4e2e2c | 2019-09-11 20:23:28 +0530 | [diff] [blame] | 338 | s64 rc; |
| 339 | |
| 340 | rc = opal_mpipl_update(OPAL_MPIPL_FREE_PRESERVED_MEMORY, 0, 0, 0); |
| 341 | if (rc) { |
| 342 | pr_err("Failed to invalidate - unexpected Error(%lld).\n", rc); |
| 343 | return -EIO; |
| 344 | } |
| 345 | |
| 346 | fadump_conf->dump_active = 0; |
| 347 | opal_fdm_active = NULL; |
| 348 | return 0; |
Hari Bathini | 41df592 | 2019-09-11 20:20:26 +0530 | [diff] [blame] | 349 | } |
| 350 | |
Hari Bathini | 2790d01 | 2019-09-11 20:21:16 +0530 | [diff] [blame] | 351 | static void opal_fadump_cleanup(struct fw_dump *fadump_conf) |
| 352 | { |
| 353 | s64 ret; |
| 354 | |
| 355 | ret = opal_mpipl_register_tag(OPAL_MPIPL_TAG_KERNEL, 0); |
| 356 | if (ret != OPAL_SUCCESS) |
| 357 | pr_warn("Could not reset (%llu) kernel metadata tag!\n", ret); |
| 358 | } |
| 359 | |
Hari Bathini | 5000a17 | 2019-09-11 20:24:50 +0530 | [diff] [blame] | 360 | /* |
| 361 | * Verify if CPU state data is available. If available, do a bit of sanity |
| 362 | * checking before processing this data. |
| 363 | */ |
| 364 | static bool __init is_opal_fadump_cpu_data_valid(struct fw_dump *fadump_conf) |
| 365 | { |
| 366 | if (!opal_cpu_metadata) |
| 367 | return false; |
| 368 | |
| 369 | fadump_conf->cpu_state_data_version = |
| 370 | be32_to_cpu(opal_cpu_metadata->cpu_data_version); |
| 371 | fadump_conf->cpu_state_entry_size = |
| 372 | be32_to_cpu(opal_cpu_metadata->cpu_data_size); |
| 373 | fadump_conf->cpu_state_dest_vaddr = |
| 374 | (u64)__va(be64_to_cpu(opal_cpu_metadata->region[0].dest)); |
| 375 | fadump_conf->cpu_state_data_size = |
| 376 | be64_to_cpu(opal_cpu_metadata->region[0].size); |
| 377 | |
| 378 | if (fadump_conf->cpu_state_data_version != HDAT_FADUMP_CPU_DATA_VER) { |
| 379 | pr_warn("Supported CPU state data version: %u, found: %d!\n", |
| 380 | HDAT_FADUMP_CPU_DATA_VER, |
| 381 | fadump_conf->cpu_state_data_version); |
| 382 | pr_warn("WARNING: F/W using newer CPU state data format!!\n"); |
| 383 | } |
| 384 | |
| 385 | if ((fadump_conf->cpu_state_dest_vaddr == 0) || |
| 386 | (fadump_conf->cpu_state_entry_size == 0) || |
| 387 | (fadump_conf->cpu_state_entry_size > |
| 388 | fadump_conf->cpu_state_data_size)) { |
| 389 | pr_err("CPU state data is invalid. Ignoring!\n"); |
| 390 | return false; |
| 391 | } |
| 392 | |
| 393 | return true; |
| 394 | } |
| 395 | |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 396 | /* |
| 397 | * Convert CPU state data saved at the time of crash into ELF notes. |
| 398 | * |
Hari Bathini | 5000a17 | 2019-09-11 20:24:50 +0530 | [diff] [blame] | 399 | * While the crashing CPU's register data is saved by the kernel, CPU state |
| 400 | * data for all CPUs is saved by f/w. In CPU state data provided by f/w, |
| 401 | * each register entry is of 16 bytes, a numerical identifier along with |
| 402 | * a GPR/SPR flag in the first 8 bytes and the register value in the next |
| 403 | * 8 bytes. For more details refer to F/W documentation. If this data is |
| 404 | * missing or in unsupported format, append crashing CPU's register data |
| 405 | * saved by the kernel in the PT_NOTE, to have something to work with in |
| 406 | * the vmcore file. |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 407 | */ |
| 408 | static int __init |
| 409 | opal_fadump_build_cpu_notes(struct fw_dump *fadump_conf, |
| 410 | struct fadump_crash_info_header *fdh) |
| 411 | { |
Hari Bathini | 5000a17 | 2019-09-11 20:24:50 +0530 | [diff] [blame] | 412 | u32 thread_pir, size_per_thread, regs_offset, regs_cnt, reg_esize; |
| 413 | struct hdat_fadump_thread_hdr *thdr; |
| 414 | bool is_cpu_data_valid = false; |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 415 | u32 num_cpus = 1, *note_buf; |
Hari Bathini | 5000a17 | 2019-09-11 20:24:50 +0530 | [diff] [blame] | 416 | struct pt_regs regs; |
| 417 | char *bufp; |
| 418 | int rc, i; |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 419 | |
Hari Bathini | 5000a17 | 2019-09-11 20:24:50 +0530 | [diff] [blame] | 420 | if (is_opal_fadump_cpu_data_valid(fadump_conf)) { |
| 421 | size_per_thread = fadump_conf->cpu_state_entry_size; |
| 422 | num_cpus = (fadump_conf->cpu_state_data_size / size_per_thread); |
| 423 | bufp = __va(fadump_conf->cpu_state_dest_vaddr); |
| 424 | is_cpu_data_valid = true; |
| 425 | } |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 426 | |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 427 | rc = fadump_setup_cpu_notes_buf(num_cpus); |
| 428 | if (rc != 0) |
| 429 | return rc; |
| 430 | |
| 431 | note_buf = (u32 *)fadump_conf->cpu_notes_buf_vaddr; |
Hari Bathini | 5000a17 | 2019-09-11 20:24:50 +0530 | [diff] [blame] | 432 | if (!is_cpu_data_valid) |
| 433 | goto out; |
| 434 | |
| 435 | /* |
| 436 | * Offset for register entries, entry size and registers count is |
| 437 | * duplicated in every thread header in keeping with HDAT format. |
| 438 | * Use these values from the first thread header. |
| 439 | */ |
| 440 | thdr = (struct hdat_fadump_thread_hdr *)bufp; |
| 441 | regs_offset = (offsetof(struct hdat_fadump_thread_hdr, offset) + |
| 442 | be32_to_cpu(thdr->offset)); |
| 443 | reg_esize = be32_to_cpu(thdr->esize); |
| 444 | regs_cnt = be32_to_cpu(thdr->ecnt); |
| 445 | |
| 446 | pr_debug("--------CPU State Data------------\n"); |
| 447 | pr_debug("NumCpus : %u\n", num_cpus); |
| 448 | pr_debug("\tOffset: %u, Entry size: %u, Cnt: %u\n", |
| 449 | regs_offset, reg_esize, regs_cnt); |
| 450 | |
| 451 | for (i = 0; i < num_cpus; i++, bufp += size_per_thread) { |
| 452 | thdr = (struct hdat_fadump_thread_hdr *)bufp; |
| 453 | |
| 454 | thread_pir = be32_to_cpu(thdr->pir); |
| 455 | pr_debug("[%04d] PIR: 0x%x, core state: 0x%02x\n", |
| 456 | i, thread_pir, thdr->core_state); |
| 457 | |
| 458 | /* |
| 459 | * If this is kernel initiated crash, crashing_cpu would be set |
| 460 | * appropriately and register data of the crashing CPU saved by |
| 461 | * crashing kernel. Add this saved register data of crashing CPU |
| 462 | * to elf notes and populate the pt_regs for the remaining CPUs |
| 463 | * from register state data provided by firmware. |
| 464 | */ |
| 465 | if (fdh->crashing_cpu == thread_pir) { |
| 466 | note_buf = fadump_regs_to_elf_notes(note_buf, |
| 467 | &fdh->regs); |
| 468 | pr_debug("Crashing CPU PIR: 0x%x - R1 : 0x%lx, NIP : 0x%lx\n", |
| 469 | fdh->crashing_cpu, fdh->regs.gpr[1], |
| 470 | fdh->regs.nip); |
| 471 | continue; |
| 472 | } |
| 473 | |
| 474 | /* |
| 475 | * Register state data of MAX cores is provided by firmware, |
| 476 | * but some of this cores may not be active. So, while |
| 477 | * processing register state data, check core state and |
| 478 | * skip threads that belong to inactive cores. |
| 479 | */ |
| 480 | if (thdr->core_state == HDAT_FADUMP_CORE_INACTIVE) |
| 481 | continue; |
| 482 | |
| 483 | opal_fadump_read_regs((bufp + regs_offset), regs_cnt, |
Hari Bathini | 6f713d1 | 2019-09-11 20:26:33 +0530 | [diff] [blame] | 484 | reg_esize, true, ®s); |
Hari Bathini | 5000a17 | 2019-09-11 20:24:50 +0530 | [diff] [blame] | 485 | note_buf = fadump_regs_to_elf_notes(note_buf, ®s); |
| 486 | pr_debug("CPU PIR: 0x%x - R1 : 0x%lx, NIP : 0x%lx\n", |
| 487 | thread_pir, regs.gpr[1], regs.nip); |
| 488 | } |
| 489 | |
| 490 | out: |
| 491 | /* |
| 492 | * CPU state data is invalid/unsupported. Try appending crashing CPU's |
| 493 | * register data, if it is saved by the kernel. |
| 494 | */ |
| 495 | if (fadump_conf->cpu_notes_buf_vaddr == (u64)note_buf) { |
| 496 | if (fdh->crashing_cpu == FADUMP_CPU_UNKNOWN) { |
| 497 | fadump_free_cpu_notes_buf(); |
| 498 | return -ENODEV; |
| 499 | } |
| 500 | |
| 501 | pr_warn("WARNING: appending only crashing CPU's register data\n"); |
| 502 | note_buf = fadump_regs_to_elf_notes(note_buf, &(fdh->regs)); |
| 503 | } |
| 504 | |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 505 | final_note(note_buf); |
| 506 | |
| 507 | pr_debug("Updating elfcore header (%llx) with cpu notes\n", |
| 508 | fdh->elfcorehdr_addr); |
| 509 | fadump_update_elfcore_header(__va(fdh->elfcorehdr_addr)); |
| 510 | return 0; |
| 511 | } |
| 512 | |
Hari Bathini | 41df592 | 2019-09-11 20:20:26 +0530 | [diff] [blame] | 513 | static int __init opal_fadump_process(struct fw_dump *fadump_conf) |
| 514 | { |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 515 | struct fadump_crash_info_header *fdh; |
| 516 | int rc = -EINVAL; |
| 517 | |
| 518 | if (!opal_fdm_active || !fadump_conf->fadumphdr_addr) |
| 519 | return rc; |
| 520 | |
| 521 | /* Validate the fadump crash info header */ |
| 522 | fdh = __va(fadump_conf->fadumphdr_addr); |
| 523 | if (fdh->magic_number != FADUMP_CRASH_INFO_MAGIC) { |
| 524 | pr_err("Crash info header is not valid.\n"); |
| 525 | return rc; |
| 526 | } |
| 527 | |
Hari Bathini | 6f713d1 | 2019-09-11 20:26:33 +0530 | [diff] [blame] | 528 | #ifdef CONFIG_OPAL_CORE |
| 529 | /* |
| 530 | * If this is a kernel initiated crash, crashing_cpu would be set |
| 531 | * appropriately and register data of the crashing CPU saved by |
| 532 | * crashing kernel. Add this saved register data of crashing CPU |
| 533 | * to elf notes and populate the pt_regs for the remaining CPUs |
| 534 | * from register state data provided by firmware. |
| 535 | */ |
| 536 | if (fdh->crashing_cpu != FADUMP_CPU_UNKNOWN) |
| 537 | kernel_initiated = true; |
| 538 | #endif |
| 539 | |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 540 | rc = opal_fadump_build_cpu_notes(fadump_conf, fdh); |
| 541 | if (rc) |
| 542 | return rc; |
| 543 | |
| 544 | /* |
| 545 | * We are done validating dump info and elfcore header is now ready |
| 546 | * to be exported. set elfcorehdr_addr so that vmcore module will |
| 547 | * export the elfcore header through '/proc/vmcore'. |
| 548 | */ |
| 549 | elfcorehdr_addr = fdh->elfcorehdr_addr; |
| 550 | |
| 551 | return rc; |
Hari Bathini | 41df592 | 2019-09-11 20:20:26 +0530 | [diff] [blame] | 552 | } |
| 553 | |
| 554 | static void opal_fadump_region_show(struct fw_dump *fadump_conf, |
| 555 | struct seq_file *m) |
| 556 | { |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 557 | const struct opal_fadump_mem_struct *fdm_ptr; |
Hari Bathini | 742a265 | 2019-09-11 20:20:57 +0530 | [diff] [blame] | 558 | u64 dumped_bytes = 0; |
| 559 | int i; |
| 560 | |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 561 | if (fadump_conf->dump_active) |
| 562 | fdm_ptr = opal_fdm_active; |
| 563 | else |
| 564 | fdm_ptr = opal_fdm; |
| 565 | |
Hari Bathini | 742a265 | 2019-09-11 20:20:57 +0530 | [diff] [blame] | 566 | for (i = 0; i < fdm_ptr->region_cnt; i++) { |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 567 | /* |
| 568 | * Only regions that are registered for MPIPL |
| 569 | * would have dump data. |
| 570 | */ |
| 571 | if ((fadump_conf->dump_active) && |
| 572 | (i < fdm_ptr->registered_regions)) |
| 573 | dumped_bytes = fdm_ptr->rgn[i].size; |
| 574 | |
Hari Bathini | 742a265 | 2019-09-11 20:20:57 +0530 | [diff] [blame] | 575 | seq_printf(m, "DUMP: Src: %#016llx, Dest: %#016llx, ", |
| 576 | fdm_ptr->rgn[i].src, fdm_ptr->rgn[i].dest); |
| 577 | seq_printf(m, "Size: %#llx, Dumped: %#llx bytes\n", |
| 578 | fdm_ptr->rgn[i].size, dumped_bytes); |
| 579 | } |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 580 | |
| 581 | /* Dump is active. Show reserved area start address. */ |
| 582 | if (fadump_conf->dump_active) { |
| 583 | seq_printf(m, "\nMemory above %#016lx is reserved for saving crash dump\n", |
| 584 | fadump_conf->reserve_dump_area_start); |
| 585 | } |
Hari Bathini | 41df592 | 2019-09-11 20:20:26 +0530 | [diff] [blame] | 586 | } |
| 587 | |
| 588 | static void opal_fadump_trigger(struct fadump_crash_info_header *fdh, |
| 589 | const char *msg) |
| 590 | { |
| 591 | int rc; |
| 592 | |
Hari Bathini | 5000a17 | 2019-09-11 20:24:50 +0530 | [diff] [blame] | 593 | /* |
| 594 | * Unlike on pSeries platform, logical CPU number is not provided |
| 595 | * with architected register state data. So, store the crashing |
| 596 | * CPU's PIR instead to plug the appropriate register data for |
| 597 | * crashing CPU in the vmcore file. |
| 598 | */ |
| 599 | fdh->crashing_cpu = (u32)mfspr(SPRN_PIR); |
| 600 | |
Hari Bathini | 41df592 | 2019-09-11 20:20:26 +0530 | [diff] [blame] | 601 | rc = opal_cec_reboot2(OPAL_REBOOT_MPIPL, msg); |
| 602 | if (rc == OPAL_UNSUPPORTED) { |
| 603 | pr_emerg("Reboot type %d not supported.\n", |
| 604 | OPAL_REBOOT_MPIPL); |
| 605 | } else if (rc == OPAL_HARDWARE) |
| 606 | pr_emerg("No backend support for MPIPL!\n"); |
| 607 | } |
| 608 | |
| 609 | static struct fadump_ops opal_fadump_ops = { |
| 610 | .fadump_init_mem_struct = opal_fadump_init_mem_struct, |
Hari Bathini | 742a265 | 2019-09-11 20:20:57 +0530 | [diff] [blame] | 611 | .fadump_get_metadata_size = opal_fadump_get_metadata_size, |
| 612 | .fadump_setup_metadata = opal_fadump_setup_metadata, |
Hari Bathini | 7b1b3b4 | 2019-09-11 20:26:59 +0530 | [diff] [blame] | 613 | .fadump_get_bootmem_min = opal_fadump_get_bootmem_min, |
Hari Bathini | 41df592 | 2019-09-11 20:20:26 +0530 | [diff] [blame] | 614 | .fadump_register = opal_fadump_register, |
| 615 | .fadump_unregister = opal_fadump_unregister, |
| 616 | .fadump_invalidate = opal_fadump_invalidate, |
Hari Bathini | 2790d01 | 2019-09-11 20:21:16 +0530 | [diff] [blame] | 617 | .fadump_cleanup = opal_fadump_cleanup, |
Hari Bathini | 41df592 | 2019-09-11 20:20:26 +0530 | [diff] [blame] | 618 | .fadump_process = opal_fadump_process, |
| 619 | .fadump_region_show = opal_fadump_region_show, |
| 620 | .fadump_trigger = opal_fadump_trigger, |
| 621 | }; |
| 622 | |
| 623 | void __init opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node) |
| 624 | { |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 625 | const __be32 *prop; |
Hari Bathini | 41df592 | 2019-09-11 20:20:26 +0530 | [diff] [blame] | 626 | unsigned long dn; |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 627 | u64 addr = 0; |
Hari Bathini | 7b1b3b4 | 2019-09-11 20:26:59 +0530 | [diff] [blame] | 628 | int i, len; |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 629 | s64 ret; |
| 630 | |
Hari Bathini | 41df592 | 2019-09-11 20:20:26 +0530 | [diff] [blame] | 631 | /* |
| 632 | * Check if Firmware-Assisted Dump is supported. if yes, check |
| 633 | * if dump has been initiated on last reboot. |
| 634 | */ |
| 635 | dn = of_get_flat_dt_subnode_by_name(node, "dump"); |
| 636 | if (dn == -FDT_ERR_NOTFOUND) { |
| 637 | pr_debug("FADump support is missing!\n"); |
| 638 | return; |
| 639 | } |
| 640 | |
| 641 | if (!of_flat_dt_is_compatible(dn, "ibm,opal-dump")) { |
| 642 | pr_err("Support missing for this f/w version!\n"); |
| 643 | return; |
| 644 | } |
| 645 | |
Hari Bathini | 7b1b3b4 | 2019-09-11 20:26:59 +0530 | [diff] [blame] | 646 | prop = of_get_flat_dt_prop(dn, "fw-load-area", &len); |
| 647 | if (prop) { |
| 648 | /* |
| 649 | * Each f/w load area is an (address,size) pair, |
| 650 | * 2 cells each, totalling 4 cells per range. |
| 651 | */ |
| 652 | for (i = 0; i < len / (sizeof(*prop) * 4); i++) { |
| 653 | u64 base, end; |
| 654 | |
| 655 | base = of_read_number(prop + (i * 4) + 0, 2); |
| 656 | end = base; |
| 657 | end += of_read_number(prop + (i * 4) + 2, 2); |
| 658 | if (end > OPAL_FADUMP_MIN_BOOT_MEM) { |
| 659 | pr_err("F/W load area: 0x%llx-0x%llx\n", |
| 660 | base, end); |
| 661 | pr_err("F/W version not supported!\n"); |
| 662 | return; |
| 663 | } |
| 664 | } |
| 665 | } |
| 666 | |
Hari Bathini | 41df592 | 2019-09-11 20:20:26 +0530 | [diff] [blame] | 667 | fadump_conf->ops = &opal_fadump_ops; |
| 668 | fadump_conf->fadump_supported = 1; |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 669 | |
| 670 | /* |
Hari Bathini | 7dee93a | 2019-09-11 20:27:39 +0530 | [diff] [blame] | 671 | * Firmware supports 32-bit field for size. Align it to PAGE_SIZE |
| 672 | * and request firmware to copy multiple kernel boot memory regions. |
| 673 | */ |
Christophe Leroy | e96d904 | 2020-04-20 18:36:35 +0000 | [diff] [blame] | 674 | fadump_conf->max_copy_size = ALIGN_DOWN(U32_MAX, PAGE_SIZE); |
Hari Bathini | 7dee93a | 2019-09-11 20:27:39 +0530 | [diff] [blame] | 675 | |
| 676 | /* |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 677 | * Check if dump has been initiated on last reboot. |
| 678 | */ |
| 679 | prop = of_get_flat_dt_prop(dn, "mpipl-boot", NULL); |
| 680 | if (!prop) |
| 681 | return; |
| 682 | |
| 683 | ret = opal_mpipl_query_tag(OPAL_MPIPL_TAG_KERNEL, &addr); |
| 684 | if ((ret != OPAL_SUCCESS) || !addr) { |
| 685 | pr_err("Failed to get Kernel metadata (%lld)\n", ret); |
| 686 | return; |
| 687 | } |
| 688 | |
| 689 | addr = be64_to_cpu(addr); |
| 690 | pr_debug("Kernel metadata addr: %llx\n", addr); |
| 691 | |
| 692 | opal_fdm_active = __va(addr); |
| 693 | if (opal_fdm_active->version != OPAL_FADUMP_VERSION) { |
| 694 | pr_warn("Supported kernel metadata version: %u, found: %d!\n", |
| 695 | OPAL_FADUMP_VERSION, opal_fdm_active->version); |
| 696 | pr_warn("WARNING: Kernel metadata format mismatch identified! Core file maybe corrupted..\n"); |
| 697 | } |
| 698 | |
| 699 | /* Kernel regions not registered with f/w for MPIPL */ |
| 700 | if (opal_fdm_active->registered_regions == 0) { |
| 701 | opal_fdm_active = NULL; |
| 702 | return; |
| 703 | } |
| 704 | |
Hari Bathini | 5000a17 | 2019-09-11 20:24:50 +0530 | [diff] [blame] | 705 | ret = opal_mpipl_query_tag(OPAL_MPIPL_TAG_CPU, &addr); |
| 706 | if (addr) { |
| 707 | addr = be64_to_cpu(addr); |
| 708 | pr_debug("CPU metadata addr: %llx\n", addr); |
| 709 | opal_cpu_metadata = __va(addr); |
| 710 | } |
| 711 | |
Hari Bathini | 2a1b06d | 2019-09-11 20:21:59 +0530 | [diff] [blame] | 712 | pr_info("Firmware-assisted dump is active.\n"); |
| 713 | fadump_conf->dump_active = 1; |
| 714 | opal_fadump_get_config(fadump_conf, opal_fdm_active); |
Hari Bathini | 41df592 | 2019-09-11 20:20:26 +0530 | [diff] [blame] | 715 | } |
Hari Bathini | bec5319 | 2019-09-11 20:26:03 +0530 | [diff] [blame] | 716 | #endif /* !CONFIG_PRESERVE_FA_DUMP */ |