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https://kernel.googlesource.com/pub/scm/linux/kernel/git/stable/linux-stable.git
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pstore/zone,blk: Add ftrace frontend support
Support backend for ftrace. To enable ftrace backend, just make ftrace_size be greater than 0 and a multiple of 4096. Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com> Link: https://lore.kernel.org/lkml/20200511233229.27745-6-keescook@chromium.org/ Co-developed-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Colin Ian King <colin.king@canonical.com> Link: https://lore.kernel.org/lkml/20200512170719.221514-1-colin.king@canonical.com Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
WeiXiong Liao
Kees Cook
parent
cc9c4d1b55
commit
34327e9fd2
@ -248,3 +248,15 @@ config PSTORE_BLK_CONSOLE_SIZE
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NOTE that, both Kconfig and module parameters can configure
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pstore/blk, but module parameters have priority over Kconfig.
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config PSTORE_BLK_FTRACE_SIZE
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int "Size in Kbytes of ftrace log to store"
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depends on PSTORE_BLK
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depends on PSTORE_FTRACE
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default 64
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help
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This just sets size of ftrace log (ftrace_size) for pstore/blk. The
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size is in KB and must be a multiple of 4.
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NOTE that, both Kconfig and module parameters can configure
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pstore/blk, but module parameters have priority over Kconfig.
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@ -43,6 +43,14 @@ static long console_size = -1;
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module_param(console_size, long, 0400);
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MODULE_PARM_DESC(console_size, "console size in kbytes");
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#if IS_ENABLED(CONFIG_PSTORE_FTRACE)
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static long ftrace_size = CONFIG_PSTORE_BLK_FTRACE_SIZE;
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#else
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static long ftrace_size = -1;
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#endif
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module_param(ftrace_size, long, 0400);
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MODULE_PARM_DESC(ftrace_size, "ftrace size in kbytes");
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/*
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* blkdev - the block device to use for pstore storage
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*
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@ -152,6 +160,7 @@ static int psblk_register_do(struct pstore_device_info *dev)
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verify_size(kmsg_size, 4096, dev->flags & PSTORE_FLAGS_DMESG);
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verify_size(pmsg_size, 4096, dev->flags & PSTORE_FLAGS_PMSG);
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verify_size(console_size, 4096, dev->flags & PSTORE_FLAGS_CONSOLE);
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verify_size(ftrace_size, 4096, dev->flags & PSTORE_FLAGS_FTRACE);
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#undef verify_size
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pstore_zone_info->total_size = dev->total_size;
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114
fs/pstore/zone.c
114
fs/pstore/zone.c
@ -92,11 +92,14 @@ struct pstore_zone {
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* @kpszs: kmsg dump storage zones
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* @ppsz: pmsg storage zone
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* @cpsz: console storage zone
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* @fpszs: ftrace storage zones
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* @kmsg_max_cnt: max count of @kpszs
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* @kmsg_read_cnt: counter of total read kmsg dumps
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* @kmsg_write_cnt: counter of total kmsg dump writes
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* @pmsg_read_cnt: counter of total read pmsg zone
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* @console_read_cnt: counter of total read console zone
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* @ftrace_max_cnt: max count of @fpszs
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* @ftrace_read_cnt: counter of max read ftrace zone
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* @oops_counter: counter of oops dumps
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* @panic_counter: counter of panic dumps
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* @recovered: whether finished recovering data from storage
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@ -109,11 +112,14 @@ struct psz_context {
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struct pstore_zone **kpszs;
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struct pstore_zone *ppsz;
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struct pstore_zone *cpsz;
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struct pstore_zone **fpszs;
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unsigned int kmsg_max_cnt;
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unsigned int kmsg_read_cnt;
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unsigned int kmsg_write_cnt;
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unsigned int pmsg_read_cnt;
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unsigned int console_read_cnt;
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unsigned int ftrace_max_cnt;
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unsigned int ftrace_read_cnt;
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/*
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* These counters should be calculated during recovery.
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* It records the oops/panic times after crashes rather than boots.
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@ -314,6 +320,8 @@ static void psz_flush_all_dirty_zones(struct work_struct *work)
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ret |= psz_flush_dirty_zone(cxt->cpsz);
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if (cxt->kpszs)
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ret |= psz_flush_dirty_zones(cxt->kpszs, cxt->kmsg_max_cnt);
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if (cxt->fpszs)
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ret |= psz_flush_dirty_zones(cxt->fpszs, cxt->ftrace_max_cnt);
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if (ret && cxt->pstore_zone_info)
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schedule_delayed_work(&psz_cleaner, msecs_to_jiffies(1000));
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}
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@ -550,6 +558,31 @@ free_oldbuf:
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return ret;
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}
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static int psz_recover_zones(struct psz_context *cxt,
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struct pstore_zone **zones, unsigned int cnt)
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{
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int ret;
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unsigned int i;
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struct pstore_zone *zone;
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if (!zones)
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return 0;
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for (i = 0; i < cnt; i++) {
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zone = zones[i];
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if (unlikely(!zone))
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continue;
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ret = psz_recover_zone(cxt, zone);
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if (ret)
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goto recover_fail;
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}
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return 0;
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recover_fail:
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pr_debug("recover %s[%u] failed\n", zone->name, i);
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return ret;
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}
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/**
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* psz_recovery() - recover data from storage
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* @cxt: the context of pstore/zone
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@ -574,6 +607,10 @@ static inline int psz_recovery(struct psz_context *cxt)
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goto out;
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ret = psz_recover_zone(cxt, cxt->cpsz);
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if (ret)
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goto out;
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ret = psz_recover_zones(cxt, cxt->fpszs, cxt->ftrace_max_cnt);
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out:
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if (unlikely(ret))
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@ -592,6 +629,7 @@ static int psz_pstore_open(struct pstore_info *psi)
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cxt->kmsg_read_cnt = 0;
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cxt->pmsg_read_cnt = 0;
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cxt->console_read_cnt = 0;
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cxt->ftrace_read_cnt = 0;
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return 0;
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}
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@ -658,6 +696,10 @@ static int psz_pstore_erase(struct pstore_record *record)
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return psz_record_erase(cxt, cxt->ppsz);
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case PSTORE_TYPE_CONSOLE:
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return psz_record_erase(cxt, cxt->cpsz);
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case PSTORE_TYPE_FTRACE:
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if (record->id >= cxt->ftrace_max_cnt)
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return -EINVAL;
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return psz_record_erase(cxt, cxt->fpszs[record->id]);
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default: return -EINVAL;
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}
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}
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@ -802,6 +844,13 @@ static int notrace psz_pstore_write(struct pstore_record *record)
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return psz_record_write(cxt->cpsz, record);
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case PSTORE_TYPE_PMSG:
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return psz_record_write(cxt->ppsz, record);
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case PSTORE_TYPE_FTRACE: {
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int zonenum = smp_processor_id();
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if (!cxt->fpszs)
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return -ENOSPC;
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return psz_record_write(cxt->fpszs[zonenum], record);
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}
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default:
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return -EINVAL;
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}
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@ -817,6 +866,14 @@ static struct pstore_zone *psz_read_next_zone(struct psz_context *cxt)
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return zone;
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}
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if (cxt->ftrace_read_cnt < cxt->ftrace_max_cnt)
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/*
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* No need psz_old_ok(). Let psz_ftrace_read() do so for
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* combination. psz_ftrace_read() should traverse over
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* all zones in case of some zone without data.
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*/
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return cxt->fpszs[cxt->ftrace_read_cnt++];
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if (cxt->pmsg_read_cnt == 0) {
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cxt->pmsg_read_cnt++;
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zone = cxt->ppsz;
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@ -891,6 +948,38 @@ static ssize_t psz_kmsg_read(struct pstore_zone *zone,
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return size + hlen;
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}
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/* try to combine all ftrace zones */
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static ssize_t psz_ftrace_read(struct pstore_zone *zone,
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struct pstore_record *record)
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{
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struct psz_context *cxt;
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struct psz_buffer *buf;
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int ret;
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if (!zone || !record)
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return -ENOSPC;
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if (!psz_old_ok(zone))
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goto out;
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buf = (struct psz_buffer *)zone->oldbuf;
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if (!buf)
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return -ENOMSG;
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ret = pstore_ftrace_combine_log(&record->buf, &record->size,
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(char *)buf->data, atomic_read(&buf->datalen));
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if (unlikely(ret))
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return ret;
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out:
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cxt = record->psi->data;
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if (cxt->ftrace_read_cnt < cxt->ftrace_max_cnt)
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/* then, read next ftrace zone */
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return -ENOMSG;
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record->id = 0;
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return record->size ? record->size : -ENOMSG;
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}
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static ssize_t psz_record_read(struct pstore_zone *zone,
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struct pstore_record *record)
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{
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@ -941,6 +1030,9 @@ next_zone:
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readop = psz_kmsg_read;
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record->id = cxt->kmsg_read_cnt - 1;
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break;
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case PSTORE_TYPE_FTRACE:
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readop = psz_ftrace_read;
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break;
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case PSTORE_TYPE_CONSOLE:
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fallthrough;
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case PSTORE_TYPE_PMSG:
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@ -1005,6 +1097,8 @@ static void psz_free_all_zones(struct psz_context *cxt)
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psz_free_zone(&cxt->ppsz);
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if (cxt->cpsz)
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psz_free_zone(&cxt->cpsz);
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if (cxt->fpszs)
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psz_free_zones(&cxt->fpszs, &cxt->ftrace_max_cnt);
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}
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static struct pstore_zone *psz_init_zone(enum pstore_type_id type,
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@ -1115,6 +1209,17 @@ static int psz_alloc_zones(struct psz_context *cxt)
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goto free_out;
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}
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off_size += info->ftrace_size;
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cxt->fpszs = psz_init_zones(PSTORE_TYPE_FTRACE, &off,
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info->ftrace_size,
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info->ftrace_size / nr_cpu_ids,
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&cxt->ftrace_max_cnt);
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if (IS_ERR(cxt->fpszs)) {
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err = PTR_ERR(cxt->fpszs);
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cxt->fpszs = NULL;
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goto free_out;
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}
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cxt->kpszs = psz_init_zones(PSTORE_TYPE_DMESG, &off,
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info->total_size - off_size,
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info->kmsg_size, &cxt->kmsg_max_cnt);
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@ -1149,7 +1254,8 @@ int register_pstore_zone(struct pstore_zone_info *info)
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return -EINVAL;
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}
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if (!info->kmsg_size && !info->pmsg_size && !info->console_size) {
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if (!info->kmsg_size && !info->pmsg_size && !info->console_size &&
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!info->ftrace_size) {
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pr_warn("at least one record size must be non-zero\n");
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return -EINVAL;
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}
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@ -1173,6 +1279,7 @@ int register_pstore_zone(struct pstore_zone_info *info)
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check_size(kmsg_size, SECTOR_SIZE);
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check_size(pmsg_size, SECTOR_SIZE);
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check_size(console_size, SECTOR_SIZE);
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check_size(ftrace_size, SECTOR_SIZE);
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#undef check_size
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@ -1200,6 +1307,7 @@ int register_pstore_zone(struct pstore_zone_info *info)
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pr_debug("\tkmsg size : %ld Bytes\n", info->kmsg_size);
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pr_debug("\tpmsg size : %ld Bytes\n", info->pmsg_size);
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pr_debug("\tconsole size : %ld Bytes\n", info->console_size);
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pr_debug("\tftrace size : %ld Bytes\n", info->ftrace_size);
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err = psz_alloc_zones(cxt);
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if (err) {
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@ -1237,6 +1345,10 @@ int register_pstore_zone(struct pstore_zone_info *info)
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cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE;
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pr_cont(" console");
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}
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if (info->ftrace_size) {
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cxt->pstore.flags |= PSTORE_FLAGS_FTRACE;
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pr_cont(" ftrace");
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}
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pr_cont("\n");
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err = pstore_register(&cxt->pstore);
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@ -19,6 +19,7 @@ typedef ssize_t (*pstore_zone_write_op)(const char *, size_t, loff_t);
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* @max_reason: Maximum kmsg dump reason to store.
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* @pmsg_size: The size of pmsg zone which is the same as @kmsg_size.
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* @console_size:The size of console zone which is the same as @kmsg_size.
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* @ftrace_size:The size of ftrace zone which is the same as @kmsg_size.
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* @read: The general read operation. Both of the function parameters
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* @size and @offset are relative value to storage.
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* On success, the number of bytes should be returned, others
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@ -37,6 +38,7 @@ struct pstore_zone_info {
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int max_reason;
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unsigned long pmsg_size;
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unsigned long console_size;
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unsigned long ftrace_size;
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pstore_zone_read_op read;
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pstore_zone_write_op write;
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pstore_zone_write_op panic_write;
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