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Miller" , Rob Herring , Greg Kroah-Hartman , Jonathan Cameron , WeiXiong Liao Subject: [PATCH v2 05/11] pstore/blk: blkoops: support ftrace recorder Date: Fri, 7 Feb 2020 20:25:49 +0800 Message-Id: <1581078355-19647-6-git-send-email-liaoweixiong@allwinnertech.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1581078355-19647-1-git-send-email-liaoweixiong@allwinnertech.com> References: <1581078355-19647-1-git-send-email-liaoweixiong@allwinnertech.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200207_042610_911672_E144B078 X-CRM114-Status: GOOD ( 17.97 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org Support recorder for ftrace. To enable ftrace recorder, just make ftrace_size be greater than 0 and a multiple of 4096. Signed-off-by: WeiXiong Liao --- fs/pstore/Kconfig | 12 ++++++++ fs/pstore/blkoops.c | 11 +++++++ fs/pstore/blkzone.c | 75 ++++++++++++++++++++++++++++++++++++++++++++-- include/linux/pstore_blk.h | 4 +++ 4 files changed, 99 insertions(+), 3 deletions(-) diff --git a/fs/pstore/Kconfig b/fs/pstore/Kconfig index 5f0a42823028..308a0a4c5ee5 100644 --- a/fs/pstore/Kconfig +++ b/fs/pstore/Kconfig @@ -210,6 +210,18 @@ config PSTORE_BLKOOPS_CONSOLE_SIZE NOTE that, both kconfig and module parameters can configure blkoops, but module parameters have priority over kconfig. +config PSTORE_BLKOOPS_FTRACE_SIZE + int "ftrace size in kbytes for blkoops" + depends on PSTORE_BLKOOPS + depends on PSTORE_FTRACE + default 64 + help + This just sets size of ftrace (ftrace_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 blkoops, + but module parameters have priority over kconfig. + config PSTORE_BLKOOPS_BLKDEV string "block device for blkoops" depends on PSTORE_BLKOOPS diff --git a/fs/pstore/blkoops.c b/fs/pstore/blkoops.c index 05990bc3b168..c76bab671b0b 100644 --- a/fs/pstore/blkoops.c +++ b/fs/pstore/blkoops.c @@ -24,6 +24,10 @@ module_param(console_size, long, 0400); MODULE_PARM_DESC(console_size, "console size in kbytes"); +static long ftrace_size = -1; +module_param(ftrace_size, long, 0400); +MODULE_PARM_DESC(ftrace_size, "ftrace size in kbytes"); + static int dump_oops = -1; module_param(dump_oops, int, 0400); MODULE_PARM_DESC(total_size, "whether dump oops"); @@ -80,6 +84,12 @@ #define DEFAULT_CONSOLE_SIZE 0 #endif +#ifdef CONFIG_PSTORE_BLKOOPS_FTRACE_SIZE +#define DEFAULT_FTRACE_SIZE CONFIG_PSTORE_BLKOOPS_FTRACE_SIZE +#else +#define DEFAULT_FTRACE_SIZE 0 +#endif + #ifdef CONFIG_PSTORE_BLKOOPS_DUMP_OOPS #define DEFAULT_DUMP_OOPS CONFIG_PSTORE_BLKOOPS_DUMP_OOPS #else @@ -135,6 +145,7 @@ int blkoops_register_device(struct blkoops_device *bo_dev) verify_size(dmesg_size, DEFAULT_DMESG_SIZE, 4096); verify_size(pmsg_size, DEFAULT_PMSG_SIZE, 4096); verify_size(console_size, DEFAULT_CONSOLE_SIZE, 4096); + verify_size(ftrace_size, DEFAULT_FTRACE_SIZE, 4096); #undef verify_size dump_oops = !!(dump_oops < 0 ? DEFAULT_DUMP_OOPS : dump_oops); diff --git a/fs/pstore/blkzone.c b/fs/pstore/blkzone.c index 9a7e9b06ccf7..442e5a5bbfda 100644 --- a/fs/pstore/blkzone.c +++ b/fs/pstore/blkzone.c @@ -89,10 +89,13 @@ struct blkz_context { struct blkz_zone **dbzs; /* dmesg block zones */ struct blkz_zone *pbz; /* Pmsg block zone */ struct blkz_zone *cbz; /* console block zone */ + struct blkz_zone **fbzs; /* Ftrace zones */ unsigned int dmesg_max_cnt; unsigned int dmesg_read_cnt; unsigned int pmsg_read_cnt; unsigned int console_read_cnt; + unsigned int ftrace_max_cnt; + unsigned int ftrace_read_cnt; unsigned int dmesg_write_cnt; /* * the counter should be recovered when recover. @@ -281,6 +284,7 @@ static void blkz_flush_all_dirty_zones(struct work_struct *work) blkz_flush_dirty_zone(cxt->pbz); blkz_flush_dirty_zone(cxt->cbz); blkz_flush_dirty_zones(cxt->dbzs, cxt->dmesg_max_cnt); + blkz_flush_dirty_zones(cxt->fbzs, cxt->ftrace_max_cnt); } static int blkz_recover_dmesg_data(struct blkz_context *cxt) @@ -497,6 +501,31 @@ static int blkz_recover_zone(struct blkz_context *cxt, struct blkz_zone *zone) return ret; } +static int blkz_recover_zones(struct blkz_context *cxt, + struct blkz_zone **zones, unsigned int cnt) +{ + int ret; + unsigned int i; + struct blkz_zone *zone; + + if (!zones) + return 0; + + for (i = 0; i < cnt; i++) { + zone = zones[i]; + if (unlikely(!zone)) + continue; + ret = blkz_recover_zone(cxt, zone); + if (ret) + goto recover_fail; + } + + return 0; +recover_fail: + pr_debug("recover %s[%u] failed\n", zone->name, i); + return ret; +} + static inline int blkz_recovery(struct blkz_context *cxt) { int ret = -EBUSY; @@ -516,6 +545,10 @@ static inline int blkz_recovery(struct blkz_context *cxt) if (ret) goto recover_fail; + ret = blkz_recover_zones(cxt, cxt->fbzs, cxt->ftrace_max_cnt); + if (ret) + goto recover_fail; + pr_debug("recover end!\n"); atomic_set(&cxt->recovered, 1); return 0; @@ -532,6 +565,7 @@ static int blkz_pstore_open(struct pstore_info *psi) cxt->dmesg_read_cnt = 0; cxt->pmsg_read_cnt = 0; cxt->console_read_cnt = 0; + cxt->ftrace_read_cnt = 0; return 0; } @@ -589,6 +623,8 @@ static int blkz_pstore_erase(struct pstore_record *record) return blkz_record_erase(cxt, cxt->pbz); case PSTORE_TYPE_CONSOLE: return blkz_record_erase(cxt, cxt->cbz); + case PSTORE_TYPE_FTRACE: + return blkz_record_erase(cxt, cxt->fbzs[record->id]); default: return -EINVAL; } } @@ -743,6 +779,13 @@ static int notrace blkz_pstore_write(struct pstore_record *record) return blkz_record_write(cxt, cxt->cbz, record); case PSTORE_TYPE_PMSG: return blkz_record_write(cxt, cxt->pbz, record); + case PSTORE_TYPE_FTRACE: { + int zonenum = smp_processor_id(); + + if (!cxt->fbzs) + return -ENOSPC; + return blkz_record_write(cxt, cxt->fbzs[zonenum], record); + } default: return -EINVAL; } @@ -759,6 +802,12 @@ static struct blkz_zone *blkz_read_next_zone(struct blkz_context *cxt) return zone; } + while (cxt->ftrace_read_cnt < cxt->ftrace_max_cnt) { + zone = cxt->fbzs[cxt->ftrace_read_cnt++]; + if (blkz_old_ok(zone)) + return zone; + } + if (cxt->pmsg_read_cnt == 0) { cxt->pmsg_read_cnt++; zone = cxt->pbz; @@ -881,6 +930,9 @@ static ssize_t blkz_pstore_read(struct pstore_record *record) readop = blkz_dmesg_read; record->id = cxt->dmesg_read_cnt - 1; break; + case PSTORE_TYPE_FTRACE: + record->id = cxt->ftrace_read_cnt - 1; + /* fallthrough */ case PSTORE_TYPE_CONSOLE: /* fallthrough */ case PSTORE_TYPE_PMSG: @@ -1046,15 +1098,27 @@ static int blkz_cut_zones(struct blkz_context *cxt) goto free_pmsg; } + off_size += info->ftrace_size; + cxt->fbzs = blkz_init_zones(PSTORE_TYPE_FTRACE, &off, + info->ftrace_size, + info->ftrace_size / nr_cpu_ids, + &cxt->ftrace_max_cnt); + if (IS_ERR(cxt->fbzs)) { + err = PTR_ERR(cxt->fbzs); + goto free_console; + } + cxt->dbzs = blkz_init_zones(PSTORE_TYPE_DMESG, &off, info->total_size - off_size, info->dmesg_size, &cxt->dmesg_max_cnt); if (IS_ERR(cxt->dbzs)) { err = PTR_ERR(cxt->dbzs); - goto free_console; + goto free_ftrace; } return 0; +free_ftrace: + blkz_free_zones(&cxt->fbzs, &cxt->ftrace_max_cnt); free_console: blkz_free_zone(&cxt->cbz); free_pmsg: @@ -1103,6 +1167,7 @@ int blkz_register(struct blkz_info *info) check_size(dmesg_size, SECTOR_SIZE); check_size(pmsg_size, SECTOR_SIZE); check_size(console_size, SECTOR_SIZE); + check_size(ftrace_size, SECTOR_SIZE); #undef check_size @@ -1136,6 +1201,7 @@ int blkz_register(struct blkz_info *info) pr_debug("\tdmesg size : %ld Bytes\n", info->dmesg_size); pr_debug("\tpmsg size : %ld Bytes\n", info->pmsg_size); pr_debug("\tconsole size : %ld Bytes\n", info->console_size); + pr_debug("\tftrace size : %ld Bytes\n", info->ftrace_size); err = blkz_cut_zones(cxt); if (err) { @@ -1159,13 +1225,16 @@ int blkz_register(struct blkz_info *info) cxt->pstore.flags |= PSTORE_FLAGS_PMSG; if (info->console_size) cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE; + if (info->ftrace_size) + cxt->pstore.flags |= PSTORE_FLAGS_FTRACE; - pr_info("Registered %s as blkzone backend for %s%s%s%s\n", + pr_info("Registered %s as blkzone backend for %s%s%s%s%s\n", info->name, cxt->dbzs && cxt->bzinfo->dump_oops ? "Oops " : "", cxt->dbzs && cxt->bzinfo->panic_write ? "Panic " : "", cxt->pbz ? "Pmsg " : "", - cxt->cbz ? "Console" : ""); + cxt->cbz ? "Console " : "", + cxt->fbzs ? "Ftrace" : ""); err = pstore_register(&cxt->pstore); if (err) { diff --git a/include/linux/pstore_blk.h b/include/linux/pstore_blk.h index 546375e04419..77704c1b404a 100644 --- a/include/linux/pstore_blk.h +++ b/include/linux/pstore_blk.h @@ -25,6 +25,9 @@ * @console_size: * The size of zone for console. Zero means disabled, othewise, it must * be multiple of SECTOR_SIZE(512). + * @ftrace_size: + * The size of zone for ftrace. Zero means disabled, othewise, it must + * be multiple of SECTOR_SIZE(512). * @dump_oops: * Dump oops and panic log or only panic. * @read, @write: @@ -60,6 +63,7 @@ struct blkz_info { unsigned long dmesg_size; unsigned long pmsg_size; unsigned long console_size; + unsigned long ftrace_size; int dump_oops; blkz_read_op read; blkz_write_op write; -- 1.9.1 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/