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Diffstat (limited to 'fs/pstore/zone.c')
-rw-r--r--fs/pstore/zone.c114
1 files changed, 113 insertions, 1 deletions
diff --git a/fs/pstore/zone.c b/fs/pstore/zone.c
index ee0b64da410d..2d9f452360bb 100644
--- a/fs/pstore/zone.c
+++ b/fs/pstore/zone.c
@@ -92,11 +92,14 @@ struct pstore_zone {
* @kpszs: kmsg dump storage zones
* @ppsz: pmsg storage zone
* @cpsz: console storage zone
+ * @fpszs: ftrace storage zones
* @kmsg_max_cnt: max count of @kpszs
* @kmsg_read_cnt: counter of total read kmsg dumps
* @kmsg_write_cnt: counter of total kmsg dump writes
* @pmsg_read_cnt: counter of total read pmsg zone
* @console_read_cnt: counter of total read console zone
+ * @ftrace_max_cnt: max count of @fpszs
+ * @ftrace_read_cnt: counter of max read ftrace zone
* @oops_counter: counter of oops dumps
* @panic_counter: counter of panic dumps
* @recovered: whether finished recovering data from storage
@@ -109,11 +112,14 @@ struct psz_context {
struct pstore_zone **kpszs;
struct pstore_zone *ppsz;
struct pstore_zone *cpsz;
+ struct pstore_zone **fpszs;
unsigned int kmsg_max_cnt;
unsigned int kmsg_read_cnt;
unsigned int kmsg_write_cnt;
unsigned int pmsg_read_cnt;
unsigned int console_read_cnt;
+ unsigned int ftrace_max_cnt;
+ unsigned int ftrace_read_cnt;
/*
* These counters should be calculated during recovery.
* It records the oops/panic times after crashes rather than boots.
@@ -314,6 +320,8 @@ static void psz_flush_all_dirty_zones(struct work_struct *work)
ret |= psz_flush_dirty_zone(cxt->cpsz);
if (cxt->kpszs)
ret |= psz_flush_dirty_zones(cxt->kpszs, cxt->kmsg_max_cnt);
+ if (cxt->fpszs)
+ ret |= psz_flush_dirty_zones(cxt->fpszs, cxt->ftrace_max_cnt);
if (ret && cxt->pstore_zone_info)
schedule_delayed_work(&psz_cleaner, msecs_to_jiffies(1000));
}
@@ -550,6 +558,31 @@ free_oldbuf:
return ret;
}
+static int psz_recover_zones(struct psz_context *cxt,
+ struct pstore_zone **zones, unsigned int cnt)
+{
+ int ret;
+ unsigned int i;
+ struct pstore_zone *zone;
+
+ if (!zones)
+ return 0;
+
+ for (i = 0; i < cnt; i++) {
+ zone = zones[i];
+ if (unlikely(!zone))
+ continue;
+ ret = psz_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;
+}
+
/**
* psz_recovery() - recover data from storage
* @cxt: the context of pstore/zone
@@ -574,6 +607,10 @@ static inline int psz_recovery(struct psz_context *cxt)
goto out;
ret = psz_recover_zone(cxt, cxt->cpsz);
+ if (ret)
+ goto out;
+
+ ret = psz_recover_zones(cxt, cxt->fpszs, cxt->ftrace_max_cnt);
out:
if (unlikely(ret))
@@ -592,6 +629,7 @@ static int psz_pstore_open(struct pstore_info *psi)
cxt->kmsg_read_cnt = 0;
cxt->pmsg_read_cnt = 0;
cxt->console_read_cnt = 0;
+ cxt->ftrace_read_cnt = 0;
return 0;
}
@@ -658,6 +696,10 @@ static int psz_pstore_erase(struct pstore_record *record)
return psz_record_erase(cxt, cxt->ppsz);
case PSTORE_TYPE_CONSOLE:
return psz_record_erase(cxt, cxt->cpsz);
+ case PSTORE_TYPE_FTRACE:
+ if (record->id >= cxt->ftrace_max_cnt)
+ return -EINVAL;
+ return psz_record_erase(cxt, cxt->fpszs[record->id]);
default: return -EINVAL;
}
}
@@ -802,6 +844,13 @@ static int notrace psz_pstore_write(struct pstore_record *record)
return psz_record_write(cxt->cpsz, record);
case PSTORE_TYPE_PMSG:
return psz_record_write(cxt->ppsz, record);
+ case PSTORE_TYPE_FTRACE: {
+ int zonenum = smp_processor_id();
+
+ if (!cxt->fpszs)
+ return -ENOSPC;
+ return psz_record_write(cxt->fpszs[zonenum], record);
+ }
default:
return -EINVAL;
}
@@ -817,6 +866,14 @@ static struct pstore_zone *psz_read_next_zone(struct psz_context *cxt)
return zone;
}
+ if (cxt->ftrace_read_cnt < cxt->ftrace_max_cnt)
+ /*
+ * No need psz_old_ok(). Let psz_ftrace_read() do so for
+ * combination. psz_ftrace_read() should traverse over
+ * all zones in case of some zone without data.
+ */
+ return cxt->fpszs[cxt->ftrace_read_cnt++];
+
if (cxt->pmsg_read_cnt == 0) {
cxt->pmsg_read_cnt++;
zone = cxt->ppsz;
@@ -891,6 +948,38 @@ static ssize_t psz_kmsg_read(struct pstore_zone *zone,
return size + hlen;
}
+/* try to combine all ftrace zones */
+static ssize_t psz_ftrace_read(struct pstore_zone *zone,
+ struct pstore_record *record)
+{
+ struct psz_context *cxt;
+ struct psz_buffer *buf;
+ int ret;
+
+ if (!zone || !record)
+ return -ENOSPC;
+
+ if (!psz_old_ok(zone))
+ goto out;
+
+ buf = (struct psz_buffer *)zone->oldbuf;
+ if (!buf)
+ return -ENOMSG;
+
+ ret = pstore_ftrace_combine_log(&record->buf, &record->size,
+ (char *)buf->data, atomic_read(&buf->datalen));
+ if (unlikely(ret))
+ return ret;
+
+out:
+ cxt = record->psi->data;
+ if (cxt->ftrace_read_cnt < cxt->ftrace_max_cnt)
+ /* then, read next ftrace zone */
+ return -ENOMSG;
+ record->id = 0;
+ return record->size ? record->size : -ENOMSG;
+}
+
static ssize_t psz_record_read(struct pstore_zone *zone,
struct pstore_record *record)
{
@@ -941,6 +1030,9 @@ next_zone:
readop = psz_kmsg_read;
record->id = cxt->kmsg_read_cnt - 1;
break;
+ case PSTORE_TYPE_FTRACE:
+ readop = psz_ftrace_read;
+ break;
case PSTORE_TYPE_CONSOLE:
fallthrough;
case PSTORE_TYPE_PMSG:
@@ -1005,6 +1097,8 @@ static void psz_free_all_zones(struct psz_context *cxt)
psz_free_zone(&cxt->ppsz);
if (cxt->cpsz)
psz_free_zone(&cxt->cpsz);
+ if (cxt->fpszs)
+ psz_free_zones(&cxt->fpszs, &cxt->ftrace_max_cnt);
}
static struct pstore_zone *psz_init_zone(enum pstore_type_id type,
@@ -1115,6 +1209,17 @@ static int psz_alloc_zones(struct psz_context *cxt)
goto free_out;
}
+ off_size += info->ftrace_size;
+ cxt->fpszs = psz_init_zones(PSTORE_TYPE_FTRACE, &off,
+ info->ftrace_size,
+ info->ftrace_size / nr_cpu_ids,
+ &cxt->ftrace_max_cnt);
+ if (IS_ERR(cxt->fpszs)) {
+ err = PTR_ERR(cxt->fpszs);
+ cxt->fpszs = NULL;
+ goto free_out;
+ }
+
cxt->kpszs = psz_init_zones(PSTORE_TYPE_DMESG, &off,
info->total_size - off_size,
info->kmsg_size, &cxt->kmsg_max_cnt);
@@ -1149,7 +1254,8 @@ int register_pstore_zone(struct pstore_zone_info *info)
return -EINVAL;
}
- if (!info->kmsg_size && !info->pmsg_size && !info->console_size) {
+ if (!info->kmsg_size && !info->pmsg_size && !info->console_size &&
+ !info->ftrace_size) {
pr_warn("at least one record size must be non-zero\n");
return -EINVAL;
}
@@ -1173,6 +1279,7 @@ int register_pstore_zone(struct pstore_zone_info *info)
check_size(kmsg_size, SECTOR_SIZE);
check_size(pmsg_size, SECTOR_SIZE);
check_size(console_size, SECTOR_SIZE);
+ check_size(ftrace_size, SECTOR_SIZE);
#undef check_size
@@ -1200,6 +1307,7 @@ int register_pstore_zone(struct pstore_zone_info *info)
pr_debug("\tkmsg size : %ld Bytes\n", info->kmsg_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 = psz_alloc_zones(cxt);
if (err) {
@@ -1237,6 +1345,10 @@ int register_pstore_zone(struct pstore_zone_info *info)
cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE;
pr_cont(" console");
}
+ if (info->ftrace_size) {
+ cxt->pstore.flags |= PSTORE_FLAGS_FTRACE;
+ pr_cont(" ftrace");
+ }
pr_cont("\n");
err = pstore_register(&cxt->pstore);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-25 15:58:18 +0000