Message ID | 1585126506-18635-6-git-send-email-liaoweixiong@allwinnertech.com |
---|---|
State | Not Applicable |
Delegated to: | Miquel Raynal |
Headers | show |
Series | pstore: mtd: support crash log to block and mtd device | expand |
Hi Kees Cook, A bad subject on patch 5 and patch 6 that "blkoops" should be "pstore/zone". I will fix it in the next version. On 2020/3/25 PM 4:55, WeiXiong Liao wrote: > Support recorder for console. To enable console recorder, just make > console_size be greater than 0 and a multiple of 4096. > > Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com> > --- > fs/pstore/Kconfig | 12 ++++++++ > fs/pstore/pstore_blk.c | 12 +++++++- > fs/pstore/pstore_zone.c | 70 +++++++++++++++++++++++++++++++++++++++++---- > include/linux/pstore_zone.h | 4 ++- > 4 files changed, 91 insertions(+), 7 deletions(-) > > diff --git a/fs/pstore/Kconfig b/fs/pstore/Kconfig > index 8cead860dcfc..bf90de48ad3c 100644 > --- a/fs/pstore/Kconfig > +++ b/fs/pstore/Kconfig > @@ -225,6 +225,18 @@ config PSTORE_BLK_PMSG_SIZE > NOTE that, both Kconfig and module parameters can configure > pstore/blk, but module parameters have priority over Kconfig. > > +config PSTORE_BLK_CONSOLE_SIZE > + int "Size in Kbytes of console to store" > + depends on PSTORE_BLK > + depends on PSTORE_CONSOLE > + default 64 > + help > + This just sets size of console (console_size) for pstore/blk. The > + size is in KB and must be a multiple of 4. > + > + NOTE that, both Kconfig and module parameters can configure > + pstore/blk, but module parameters have priority over Kconfig. > + > config PSTORE_BLK_DUMP_OOPS > bool "dump oops" > depends on PSTORE_BLK > diff --git a/fs/pstore/pstore_blk.c b/fs/pstore/pstore_blk.c > index 85cd9f2335be..2b513acaa18f 100644 > --- a/fs/pstore/pstore_blk.c > +++ b/fs/pstore/pstore_blk.c > @@ -26,6 +26,14 @@ > module_param(pmsg_size, long, 0400); > MODULE_PARM_DESC(pmsg_size, "pmsg size in kbytes"); > > +#if IS_ENABLED(CONFIG_PSTORE_CONSOLE) > +static long console_size = CONFIG_PSTORE_BLK_CONSOLE_SIZE; > +#else > +static long console_size = -1; > +#endif > +module_param(console_size, long, 0400); > +MODULE_PARM_DESC(console_size, "console size in kbytes"); > + > static int dump_oops = CONFIG_PSTORE_BLK_DUMP_OOPS; > module_param(dump_oops, int, 0400); > MODULE_PARM_DESC(total_size, "whether dump oops"); > @@ -81,7 +89,8 @@ > * whole disk). > * On success, the number of bytes should be returned, others > * means error. > - * @write: The same as @read. > + * @write: The same as @read, but the following error number: > + * -EBUSY means try to write again later. > * @panic_write:The write operation only used for panic case. It's optional > * if you do not care panic log. The parameters and return value > * are the same as @read. > @@ -131,6 +140,7 @@ static int psblk_register_do(struct psblk_device *dev) > > verify_size(oops_size, 4096, dev->flags & PSTORE_FLAGS_DMESG); > verify_size(pmsg_size, 4096, dev->flags & PSTORE_FLAGS_PMSG); > + verify_size(console_size, 4096, dev->flags & PSTORE_FLAGS_CONSOLE); > #undef verify_size > dump_oops = dump_oops <= 0 ? 0 : 1; > > diff --git a/fs/pstore/pstore_zone.c b/fs/pstore/pstore_zone.c > index 444bce7f9ac3..e1e84505b046 100644 > --- a/fs/pstore/pstore_zone.c > +++ b/fs/pstore/pstore_zone.c > @@ -87,10 +87,12 @@ struct psz_zone { > * > * @opszs: oops/panic storage zones > * @ppsz: pmsg storage zone > + * @cpsz: console storage zone > * @oops_max_cnt: max count of @opszs > * @oops_read_cnt: counter to read oops zone > * @oops_write_cnt: counter to write > * @pmsg_read_cnt: counter to read pmsg zone > + * @console_read_cnt: counter to read console zone > * @oops_counter: counter to oops > * @panic_counter: counter to panic > * @recovered: whether finish recovering data from storage > @@ -102,10 +104,12 @@ struct psz_zone { > struct psz_context { > struct psz_zone **opszs; > struct psz_zone *ppsz; > + struct psz_zone *cpsz; > unsigned int oops_max_cnt; > unsigned int oops_read_cnt; > unsigned int oops_write_cnt; > unsigned int pmsg_read_cnt; > + unsigned int console_read_cnt; > /* > * the counter should be recovered when recover. > * It records the oops/panic times after burning rather than booting. > @@ -125,6 +129,9 @@ struct psz_context { > }; > static struct psz_context psz_cxt; > > +static void psz_flush_all_dirty_zones(struct work_struct *> +static DECLARE_WORK(psz_cleaner, psz_flush_all_dirty_zones); I think it's better to use delayed work. static DECLARE_DELAYED_WORK(psz_cleaner, psz_flush_all_dirty_zones); > + > /** > * enum psz_flush_mode - flush mode for psz_zone_write() > * > @@ -235,6 +242,9 @@ static int psz_zone_write(struct psz_zone *zone, > return 0; > dirty: > atomic_set(&zone->dirty, true); > + /* flush dirty zones nicely */ > + if (wcnt == -EBUSY && !is_on_panic()) > + schedule_work(&psz_cleaner); Change to: schedule_delayed_work(&psz_cleaner, msecs_to_jiffies(500)); delay for 500ms to merge more log of console and reduce calling times. > return -EBUSY; > } > > @@ -291,6 +301,15 @@ static int psz_move_zone(struct psz_zone *old, struct psz_zone *new) > return 0; > } > > +static void psz_flush_all_dirty_zones(struct work_struct *work) > +{ > + struct psz_context *cxt = &psz_cxt; > + > + psz_flush_dirty_zone(cxt->ppsz); > + psz_flush_dirty_zone(cxt->cpsz); > + psz_flush_dirty_zones(cxt->opszs, cxt->oops_max_cnt); > +} If flush dirty failed, I think it should try again later. int ret = 0; ret |= psz_flush_dirty_zone(cxt->ppsz); ret |= psz_flush_dirty_zone(cxt->cpsz); ret |= psz_flush_dirty_zones(cxt->opszs, cxt->oops_max_cnt); if (ret) schedule_delayed_work(&psz_cleaner, msecs_to_jiffies(1000)); I will fix it in the next version. > + > static int psz_recover_oops_data(struct psz_context *cxt) > { > struct psz_info *info = cxt->psz_info; > @@ -546,6 +565,10 @@ static inline int psz_recovery(struct psz_context *cxt) > if (ret) > goto recover_fail; > > + ret = psz_recover_zone(cxt, cxt->cpsz); > + if (ret) > + goto recover_fail; > + > pr_debug("recover end!\n"); > atomic_set(&cxt->recovered, 1); > return 0; > @@ -561,6 +584,7 @@ static int psz_pstore_open(struct pstore_info *psi) > > cxt->oops_read_cnt = 0; > cxt->pmsg_read_cnt = 0; > + cxt->console_read_cnt = 0; > return 0; > } > > @@ -625,8 +649,9 @@ static int psz_pstore_erase(struct pstore_record *record) > return psz_oops_erase(cxt, cxt->opszs[record->id], record); > case PSTORE_TYPE_PMSG: > return psz_record_erase(cxt, cxt->ppsz); > - default: > - return -EINVAL; > + case PSTORE_TYPE_CONSOLE: > + return psz_record_erase(cxt, cxt->cpsz); > + default: return -EINVAL; > } > } > > @@ -767,9 +792,18 @@ static int notrace psz_pstore_write(struct pstore_record *record) > record->reason == KMSG_DUMP_PANIC) > atomic_set(&cxt->on_panic, 1); > > + /* > + * if on panic, do not write except panic records > + * Fix case that panic_write prints log which wakes up console recorder. > + */ > + if (is_on_panic() && record->type != PSTORE_TYPE_DMESG) > + return -EBUSY; > + > switch (record->type) { > case PSTORE_TYPE_DMESG: > return psz_oops_write(cxt, record); > + case PSTORE_TYPE_CONSOLE: > + return psz_record_write(cxt->cpsz, record); > case PSTORE_TYPE_PMSG: > return psz_record_write(cxt->ppsz, record); > default: > @@ -794,6 +828,13 @@ static struct psz_zone *psz_read_next_zone(struct psz_context *cxt) > return zone; > } > > + if (cxt->console_read_cnt == 0) { > + cxt->console_read_cnt++; > + zone = cxt->cpsz; > + if (psz_old_ok(zone)) > + return zone; > + } > + > return NULL; > } > > @@ -903,6 +944,8 @@ static ssize_t psz_pstore_read(struct pstore_record *record) > readop = psz_oops_read; > record->id = cxt->oops_read_cnt - 1; > break; > + case PSTORE_TYPE_CONSOLE: > + fallthrough; > case PSTORE_TYPE_PMSG: > readop = psz_record_read; > break; > @@ -1050,6 +1093,8 @@ static void psz_free_all_zones(struct psz_context *cxt) > psz_free_zones(&cxt->opszs, &cxt->oops_max_cnt); > if (cxt->ppsz) > psz_free_zone(&cxt->ppsz); > + if (cxt->cpsz) > + psz_free_zone(&cxt->cpsz); > } > > static int psz_alloc_zones(struct psz_context *cxt) > @@ -1066,6 +1111,14 @@ static int psz_alloc_zones(struct psz_context *cxt) > goto free_out; > } > > + off_size += info->console_size; > + cxt->cpsz = psz_init_zone(PSTORE_TYPE_CONSOLE, &off, > + info->console_size); > + if (IS_ERR(cxt->cpsz)) { > + err = PTR_ERR(cxt->cpsz); > + goto free_out; > + } > + > cxt->opszs = psz_init_zones(PSTORE_TYPE_DMESG, &off, > info->total_size - off_size, > info->oops_size, &cxt->oops_max_cnt); > @@ -1100,7 +1153,7 @@ int psz_register(struct psz_info *info) > return -EINVAL; > } > > - if (!info->oops_size && !info->pmsg_size) { > + if (!info->oops_size && !info->pmsg_size && !info->console_size) { > pr_warn("at least one of the records be non-zero\n"); > return -EINVAL; > } > @@ -1128,6 +1181,7 @@ int psz_register(struct psz_info *info) > check_size(total_size, 4096); > check_size(oops_size, SECTOR_SIZE); > check_size(pmsg_size, SECTOR_SIZE); > + check_size(console_size, SECTOR_SIZE); > > #undef check_size > > @@ -1160,6 +1214,7 @@ int psz_register(struct psz_info *info) > pr_debug("\ttotal size : %ld Bytes\n", info->total_size); > pr_debug("\toops size : %ld Bytes\n", info->oops_size); > pr_debug("\tpmsg size : %ld Bytes\n", info->pmsg_size); > + pr_debug("\tconsole size : %ld Bytes\n", info->console_size); > > err = psz_alloc_zones(cxt); > if (err) { > @@ -1181,11 +1236,14 @@ int psz_register(struct psz_info *info) > cxt->pstore.flags |= PSTORE_FLAGS_DMESG; > if (info->pmsg_size) > cxt->pstore.flags |= PSTORE_FLAGS_PMSG; > + if (info->console_size) > + cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE; > > - pr_info("Registered %s as pszone backend for%s%s%s\n", info->name, > + pr_info("Registered %s as pszone backend for%s%s%s%s\n", info->name, > cxt->opszs && cxt->psz_info->dump_oops ? " Oops" : "", > cxt->opszs && cxt->psz_info->panic_write ? " Panic" : "", > - cxt->ppsz ? " Pmsg" : ""); > + cxt->ppsz ? " Pmsg" : "", > + cxt->cpsz ? " Console" : ""); > > err = pstore_register(&cxt->pstore); > if (err) { > @@ -1219,6 +1277,8 @@ void psz_unregister(struct psz_info *info) > { > struct psz_context *cxt = &psz_cxt; > > + flush_work(&psz_cleaner); I think it should try to flush dirty zones before unregister. psz_flush_all_dirty_zones(NULL); flush_delayed_work(&psz_cleaner); > + > pstore_unregister(&cxt->pstore); > kfree(cxt->pstore.buf); > cxt->pstore.bufsize = 0; > diff --git a/include/linux/pstore_zone.h b/include/linux/pstore_zone.h > index 85e159d8f935..8a1838633010 100644 > --- a/include/linux/pstore_zone.h > +++ b/include/linux/pstore_zone.h > @@ -17,12 +17,13 @@ > * @oops_size: The size of oops/panic zone. Zero means disabled, otherwise, > * it must be multiple of SECTOR_SIZE(512 Bytes). > * @pmsg_size: The size of pmsg zone which is the same as @oops_size. > + * @console_size:The size of console zone which is the same as @oops_size. > * @dump_oops: Whether to dump oops log. > * @read: The general read operation. Both of the function parameters > * @size and @offset are relative value to storage. > * On success, the number of bytes should be returned, others > * means error. > - * @write: The same as @read. > + * @write: The same as @read, but -EBUSY means try to write again later. > * @panic_write:The write operation only used for panic case. It's optional > * if you do not care panic log. The parameters and return value > * are the same as @read. > @@ -34,6 +35,7 @@ struct psz_info { > unsigned long total_size; > unsigned long oops_size; > unsigned long pmsg_size; > + unsigned long console_size; > int dump_oops; > psz_read_op read; > psz_write_op write; >
diff --git a/fs/pstore/Kconfig b/fs/pstore/Kconfig index 8cead860dcfc..bf90de48ad3c 100644 --- a/fs/pstore/Kconfig +++ b/fs/pstore/Kconfig @@ -225,6 +225,18 @@ config PSTORE_BLK_PMSG_SIZE NOTE that, both Kconfig and module parameters can configure pstore/blk, but module parameters have priority over Kconfig. +config PSTORE_BLK_CONSOLE_SIZE + int "Size in Kbytes of console to store" + depends on PSTORE_BLK + depends on PSTORE_CONSOLE + default 64 + help + This just sets size of console (console_size) for pstore/blk. The + size is in KB and must be a multiple of 4. + + NOTE that, both Kconfig and module parameters can configure + pstore/blk, but module parameters have priority over Kconfig. + config PSTORE_BLK_DUMP_OOPS bool "dump oops" depends on PSTORE_BLK diff --git a/fs/pstore/pstore_blk.c b/fs/pstore/pstore_blk.c index 85cd9f2335be..2b513acaa18f 100644 --- a/fs/pstore/pstore_blk.c +++ b/fs/pstore/pstore_blk.c @@ -26,6 +26,14 @@ module_param(pmsg_size, long, 0400); MODULE_PARM_DESC(pmsg_size, "pmsg size in kbytes"); +#if IS_ENABLED(CONFIG_PSTORE_CONSOLE) +static long console_size = CONFIG_PSTORE_BLK_CONSOLE_SIZE; +#else +static long console_size = -1; +#endif +module_param(console_size, long, 0400); +MODULE_PARM_DESC(console_size, "console size in kbytes"); + static int dump_oops = CONFIG_PSTORE_BLK_DUMP_OOPS; module_param(dump_oops, int, 0400); MODULE_PARM_DESC(total_size, "whether dump oops"); @@ -81,7 +89,8 @@ * whole disk). * On success, the number of bytes should be returned, others * means error. - * @write: The same as @read. + * @write: The same as @read, but the following error number: + * -EBUSY means try to write again later. * @panic_write:The write operation only used for panic case. It's optional * if you do not care panic log. The parameters and return value * are the same as @read. @@ -131,6 +140,7 @@ static int psblk_register_do(struct psblk_device *dev) verify_size(oops_size, 4096, dev->flags & PSTORE_FLAGS_DMESG); verify_size(pmsg_size, 4096, dev->flags & PSTORE_FLAGS_PMSG); + verify_size(console_size, 4096, dev->flags & PSTORE_FLAGS_CONSOLE); #undef verify_size dump_oops = dump_oops <= 0 ? 0 : 1; diff --git a/fs/pstore/pstore_zone.c b/fs/pstore/pstore_zone.c index 444bce7f9ac3..e1e84505b046 100644 --- a/fs/pstore/pstore_zone.c +++ b/fs/pstore/pstore_zone.c @@ -87,10 +87,12 @@ struct psz_zone { * * @opszs: oops/panic storage zones * @ppsz: pmsg storage zone + * @cpsz: console storage zone * @oops_max_cnt: max count of @opszs * @oops_read_cnt: counter to read oops zone * @oops_write_cnt: counter to write * @pmsg_read_cnt: counter to read pmsg zone + * @console_read_cnt: counter to read console zone * @oops_counter: counter to oops * @panic_counter: counter to panic * @recovered: whether finish recovering data from storage @@ -102,10 +104,12 @@ struct psz_zone { struct psz_context { struct psz_zone **opszs; struct psz_zone *ppsz; + struct psz_zone *cpsz; unsigned int oops_max_cnt; unsigned int oops_read_cnt; unsigned int oops_write_cnt; unsigned int pmsg_read_cnt; + unsigned int console_read_cnt; /* * the counter should be recovered when recover. * It records the oops/panic times after burning rather than booting. @@ -125,6 +129,9 @@ struct psz_context { }; static struct psz_context psz_cxt; +static void psz_flush_all_dirty_zones(struct work_struct *); +static DECLARE_WORK(psz_cleaner, psz_flush_all_dirty_zones); + /** * enum psz_flush_mode - flush mode for psz_zone_write() * @@ -235,6 +242,9 @@ static int psz_zone_write(struct psz_zone *zone, return 0; dirty: atomic_set(&zone->dirty, true); + /* flush dirty zones nicely */ + if (wcnt == -EBUSY && !is_on_panic()) + schedule_work(&psz_cleaner); return -EBUSY; } @@ -291,6 +301,15 @@ static int psz_move_zone(struct psz_zone *old, struct psz_zone *new) return 0; } +static void psz_flush_all_dirty_zones(struct work_struct *work) +{ + struct psz_context *cxt = &psz_cxt; + + psz_flush_dirty_zone(cxt->ppsz); + psz_flush_dirty_zone(cxt->cpsz); + psz_flush_dirty_zones(cxt->opszs, cxt->oops_max_cnt); +} + static int psz_recover_oops_data(struct psz_context *cxt) { struct psz_info *info = cxt->psz_info; @@ -546,6 +565,10 @@ static inline int psz_recovery(struct psz_context *cxt) if (ret) goto recover_fail; + ret = psz_recover_zone(cxt, cxt->cpsz); + if (ret) + goto recover_fail; + pr_debug("recover end!\n"); atomic_set(&cxt->recovered, 1); return 0; @@ -561,6 +584,7 @@ static int psz_pstore_open(struct pstore_info *psi) cxt->oops_read_cnt = 0; cxt->pmsg_read_cnt = 0; + cxt->console_read_cnt = 0; return 0; } @@ -625,8 +649,9 @@ static int psz_pstore_erase(struct pstore_record *record) return psz_oops_erase(cxt, cxt->opszs[record->id], record); case PSTORE_TYPE_PMSG: return psz_record_erase(cxt, cxt->ppsz); - default: - return -EINVAL; + case PSTORE_TYPE_CONSOLE: + return psz_record_erase(cxt, cxt->cpsz); + default: return -EINVAL; } } @@ -767,9 +792,18 @@ static int notrace psz_pstore_write(struct pstore_record *record) record->reason == KMSG_DUMP_PANIC) atomic_set(&cxt->on_panic, 1); + /* + * if on panic, do not write except panic records + * Fix case that panic_write prints log which wakes up console recorder. + */ + if (is_on_panic() && record->type != PSTORE_TYPE_DMESG) + return -EBUSY; + switch (record->type) { case PSTORE_TYPE_DMESG: return psz_oops_write(cxt, record); + case PSTORE_TYPE_CONSOLE: + return psz_record_write(cxt->cpsz, record); case PSTORE_TYPE_PMSG: return psz_record_write(cxt->ppsz, record); default: @@ -794,6 +828,13 @@ static struct psz_zone *psz_read_next_zone(struct psz_context *cxt) return zone; } + if (cxt->console_read_cnt == 0) { + cxt->console_read_cnt++; + zone = cxt->cpsz; + if (psz_old_ok(zone)) + return zone; + } + return NULL; } @@ -903,6 +944,8 @@ static ssize_t psz_pstore_read(struct pstore_record *record) readop = psz_oops_read; record->id = cxt->oops_read_cnt - 1; break; + case PSTORE_TYPE_CONSOLE: + fallthrough; case PSTORE_TYPE_PMSG: readop = psz_record_read; break; @@ -1050,6 +1093,8 @@ static void psz_free_all_zones(struct psz_context *cxt) psz_free_zones(&cxt->opszs, &cxt->oops_max_cnt); if (cxt->ppsz) psz_free_zone(&cxt->ppsz); + if (cxt->cpsz) + psz_free_zone(&cxt->cpsz); } static int psz_alloc_zones(struct psz_context *cxt) @@ -1066,6 +1111,14 @@ static int psz_alloc_zones(struct psz_context *cxt) goto free_out; } + off_size += info->console_size; + cxt->cpsz = psz_init_zone(PSTORE_TYPE_CONSOLE, &off, + info->console_size); + if (IS_ERR(cxt->cpsz)) { + err = PTR_ERR(cxt->cpsz); + goto free_out; + } + cxt->opszs = psz_init_zones(PSTORE_TYPE_DMESG, &off, info->total_size - off_size, info->oops_size, &cxt->oops_max_cnt); @@ -1100,7 +1153,7 @@ int psz_register(struct psz_info *info) return -EINVAL; } - if (!info->oops_size && !info->pmsg_size) { + if (!info->oops_size && !info->pmsg_size && !info->console_size) { pr_warn("at least one of the records be non-zero\n"); return -EINVAL; } @@ -1128,6 +1181,7 @@ int psz_register(struct psz_info *info) check_size(total_size, 4096); check_size(oops_size, SECTOR_SIZE); check_size(pmsg_size, SECTOR_SIZE); + check_size(console_size, SECTOR_SIZE); #undef check_size @@ -1160,6 +1214,7 @@ int psz_register(struct psz_info *info) pr_debug("\ttotal size : %ld Bytes\n", info->total_size); pr_debug("\toops size : %ld Bytes\n", info->oops_size); pr_debug("\tpmsg size : %ld Bytes\n", info->pmsg_size); + pr_debug("\tconsole size : %ld Bytes\n", info->console_size); err = psz_alloc_zones(cxt); if (err) { @@ -1181,11 +1236,14 @@ int psz_register(struct psz_info *info) cxt->pstore.flags |= PSTORE_FLAGS_DMESG; if (info->pmsg_size) cxt->pstore.flags |= PSTORE_FLAGS_PMSG; + if (info->console_size) + cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE; - pr_info("Registered %s as pszone backend for%s%s%s\n", info->name, + pr_info("Registered %s as pszone backend for%s%s%s%s\n", info->name, cxt->opszs && cxt->psz_info->dump_oops ? " Oops" : "", cxt->opszs && cxt->psz_info->panic_write ? " Panic" : "", - cxt->ppsz ? " Pmsg" : ""); + cxt->ppsz ? " Pmsg" : "", + cxt->cpsz ? " Console" : ""); err = pstore_register(&cxt->pstore); if (err) { @@ -1219,6 +1277,8 @@ void psz_unregister(struct psz_info *info) { struct psz_context *cxt = &psz_cxt; + flush_work(&psz_cleaner); + pstore_unregister(&cxt->pstore); kfree(cxt->pstore.buf); cxt->pstore.bufsize = 0; diff --git a/include/linux/pstore_zone.h b/include/linux/pstore_zone.h index 85e159d8f935..8a1838633010 100644 --- a/include/linux/pstore_zone.h +++ b/include/linux/pstore_zone.h @@ -17,12 +17,13 @@ * @oops_size: The size of oops/panic zone. Zero means disabled, otherwise, * it must be multiple of SECTOR_SIZE(512 Bytes). * @pmsg_size: The size of pmsg zone which is the same as @oops_size. + * @console_size:The size of console zone which is the same as @oops_size. * @dump_oops: Whether to dump oops log. * @read: The general read operation. Both of the function parameters * @size and @offset are relative value to storage. * On success, the number of bytes should be returned, others * means error. - * @write: The same as @read. + * @write: The same as @read, but -EBUSY means try to write again later. * @panic_write:The write operation only used for panic case. It's optional * if you do not care panic log. The parameters and return value * are the same as @read. @@ -34,6 +35,7 @@ struct psz_info { unsigned long total_size; unsigned long oops_size; unsigned long pmsg_size; + unsigned long console_size; int dump_oops; psz_read_op read; psz_write_op write;
Support recorder for console. To enable console recorder, just make console_size be greater than 0 and a multiple of 4096. Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com> --- fs/pstore/Kconfig | 12 ++++++++ fs/pstore/pstore_blk.c | 12 +++++++- fs/pstore/pstore_zone.c | 70 +++++++++++++++++++++++++++++++++++++++++---- include/linux/pstore_zone.h | 4 ++- 4 files changed, 91 insertions(+), 7 deletions(-)