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pstore/zone,blk: Add support for pmsg frontend
Add pmsg support to pstore/blk (through pstore/zone). To enable, pmsg_size must be greater than 0 and a multiple of 4096. Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com> Link: https://lore.kernel.org/lkml/20200511233229.27745-4-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/20200512171932.222102-1-colin.king@canonical.com Co-developed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
WeiXiong Liao
Kees Cook
parent
17639f67c1
commit
0dc068265a
@ -224,3 +224,15 @@ config PSTORE_BLK_MAX_REASON
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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_PMSG_SIZE
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int "Size in Kbytes of pmsg to store"
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depends on PSTORE_BLK
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depends on PSTORE_PMSG
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default 64
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help
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This just sets size of pmsg (pmsg_size) for pstore/blk. The size is
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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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@ -27,6 +27,14 @@ module_param(max_reason, int, 0400);
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MODULE_PARM_DESC(max_reason,
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"maximum reason for kmsg dump (default 2: Oops and Panic)");
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#if IS_ENABLED(CONFIG_PSTORE_PMSG)
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static long pmsg_size = CONFIG_PSTORE_BLK_PMSG_SIZE;
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#else
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static long pmsg_size = -1;
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#endif
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module_param(pmsg_size, long, 0400);
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MODULE_PARM_DESC(pmsg_size, "pmsg 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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@ -133,6 +141,7 @@ static int psblk_register_do(struct pstore_device_info *dev)
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}
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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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#undef verify_size
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pstore_zone_info->total_size = dev->total_size;
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268
fs/pstore/zone.c
268
fs/pstore/zone.c
@ -27,12 +27,14 @@
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*
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* @sig: signature to indicate header (PSZ_SIG xor PSZONE-type value)
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* @datalen: length of data in @data
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* @start: offset into @data where the beginning of the stored bytes begin
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* @data: zone data.
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*/
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struct psz_buffer {
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#define PSZ_SIG (0x43474244) /* DBGC */
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uint32_t sig;
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atomic_t datalen;
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atomic_t start;
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uint8_t data[];
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};
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@ -88,9 +90,11 @@ struct pstore_zone {
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* struct psz_context - all about running state of pstore/zone
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*
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* @kpszs: kmsg dump storage zones
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* @ppsz: pmsg storage zone
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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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* @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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@ -101,9 +105,11 @@ struct pstore_zone {
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*/
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struct psz_context {
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struct pstore_zone **kpszs;
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struct pstore_zone *ppsz;
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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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/*
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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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@ -143,15 +149,20 @@ static inline int buffer_datalen(struct pstore_zone *zone)
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return atomic_read(&zone->buffer->datalen);
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}
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static inline int buffer_start(struct pstore_zone *zone)
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{
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return atomic_read(&zone->buffer->start);
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}
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static inline bool is_on_panic(void)
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{
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return atomic_read(&pstore_zone_cxt.on_panic);
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}
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static ssize_t psz_zone_read(struct pstore_zone *zone, char *buf,
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static ssize_t psz_zone_read_buffer(struct pstore_zone *zone, char *buf,
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size_t len, unsigned long off)
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{
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if (!buf || !zone->buffer)
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if (!buf || !zone || !zone->buffer)
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return -EINVAL;
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if (off > zone->buffer_size)
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return -EINVAL;
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@ -160,6 +171,18 @@ static ssize_t psz_zone_read(struct pstore_zone *zone, char *buf,
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return len;
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}
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static int psz_zone_read_oldbuf(struct pstore_zone *zone, char *buf,
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size_t len, unsigned long off)
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{
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if (!buf || !zone || !zone->oldbuf)
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return -EINVAL;
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if (off > zone->buffer_size)
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return -EINVAL;
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len = min_t(size_t, len, zone->buffer_size - off);
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memcpy(buf, zone->oldbuf->data + off, len);
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return 0;
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}
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static int psz_zone_write(struct pstore_zone *zone,
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enum psz_flush_mode flush_mode, const char *buf,
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size_t len, unsigned long off)
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@ -415,6 +438,93 @@ recover_fail:
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return ret;
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}
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static int psz_recover_zone(struct psz_context *cxt, struct pstore_zone *zone)
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{
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struct pstore_zone_info *info = cxt->pstore_zone_info;
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struct psz_buffer *oldbuf, tmpbuf;
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int ret = 0;
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char *buf;
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ssize_t rcnt, len, start, off;
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if (!zone || zone->oldbuf)
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return 0;
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if (is_on_panic()) {
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/* save data as much as possible */
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psz_flush_dirty_zone(zone);
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return 0;
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}
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if (unlikely(!info->read))
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return -EINVAL;
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len = sizeof(struct psz_buffer);
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rcnt = info->read((char *)&tmpbuf, len, zone->off);
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if (rcnt != len) {
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pr_debug("read zone %s failed\n", zone->name);
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return (int)rcnt < 0 ? (int)rcnt : -EIO;
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}
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if (tmpbuf.sig != zone->buffer->sig) {
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pr_debug("no valid data in zone %s\n", zone->name);
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return 0;
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}
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if (zone->buffer_size < atomic_read(&tmpbuf.datalen) ||
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zone->buffer_size < atomic_read(&tmpbuf.start)) {
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pr_info("found overtop zone: %s: off %lld, size %zu\n",
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zone->name, zone->off, zone->buffer_size);
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/* just keep going */
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return 0;
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}
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if (!atomic_read(&tmpbuf.datalen)) {
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pr_debug("found erased zone: %s: off %lld, size %zu, datalen %d\n",
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zone->name, zone->off, zone->buffer_size,
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atomic_read(&tmpbuf.datalen));
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return 0;
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}
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pr_debug("found nice zone: %s: off %lld, size %zu, datalen %d\n",
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zone->name, zone->off, zone->buffer_size,
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atomic_read(&tmpbuf.datalen));
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len = atomic_read(&tmpbuf.datalen) + sizeof(*oldbuf);
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oldbuf = kzalloc(len, GFP_KERNEL);
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if (!oldbuf)
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return -ENOMEM;
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memcpy(oldbuf, &tmpbuf, sizeof(*oldbuf));
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buf = (char *)oldbuf + sizeof(*oldbuf);
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len = atomic_read(&oldbuf->datalen);
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start = atomic_read(&oldbuf->start);
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off = zone->off + sizeof(*oldbuf);
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/* get part of data */
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rcnt = info->read(buf, len - start, off + start);
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if (rcnt != len - start) {
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pr_err("read zone %s failed\n", zone->name);
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ret = (int)rcnt < 0 ? (int)rcnt : -EIO;
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goto free_oldbuf;
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}
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/* get the rest of data */
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rcnt = info->read(buf + len - start, start, off);
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if (rcnt != start) {
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pr_err("read zone %s failed\n", zone->name);
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ret = (int)rcnt < 0 ? (int)rcnt : -EIO;
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goto free_oldbuf;
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}
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zone->oldbuf = oldbuf;
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psz_flush_dirty_zone(zone);
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return 0;
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free_oldbuf:
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kfree(oldbuf);
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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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@ -431,7 +541,12 @@ static inline int psz_recovery(struct psz_context *cxt)
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return 0;
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ret = psz_kmsg_recover(cxt);
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if (ret)
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goto out;
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ret = psz_recover_zone(cxt, cxt->ppsz);
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out:
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if (unlikely(ret))
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pr_err("recover failed\n");
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else {
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@ -446,9 +561,17 @@ static int psz_pstore_open(struct pstore_info *psi)
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struct psz_context *cxt = psi->data;
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cxt->kmsg_read_cnt = 0;
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cxt->pmsg_read_cnt = 0;
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return 0;
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}
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static inline bool psz_old_ok(struct pstore_zone *zone)
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{
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if (zone && zone->oldbuf && atomic_read(&zone->oldbuf->datalen))
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return true;
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return false;
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}
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static inline bool psz_ok(struct pstore_zone *zone)
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{
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if (zone && zone->buffer && buffer_datalen(zone))
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@ -473,6 +596,25 @@ static inline int psz_kmsg_erase(struct psz_context *cxt,
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return psz_zone_write(zone, FLUSH_META, NULL, 0, 0);
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}
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static inline int psz_record_erase(struct psz_context *cxt,
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struct pstore_zone *zone)
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{
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if (unlikely(!psz_old_ok(zone)))
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return 0;
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kfree(zone->oldbuf);
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zone->oldbuf = NULL;
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/*
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* if there are new data in zone buffer, that means the old data
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* are already invalid. It is no need to flush 0 (erase) to
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* block device.
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*/
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if (!buffer_datalen(zone))
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return psz_zone_write(zone, FLUSH_META, NULL, 0, 0);
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psz_flush_dirty_zone(zone);
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return 0;
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}
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static int psz_pstore_erase(struct pstore_record *record)
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{
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struct psz_context *cxt = record->psi->data;
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@ -482,6 +624,8 @@ static int psz_pstore_erase(struct pstore_record *record)
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if (record->id >= cxt->kmsg_max_cnt)
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return -EINVAL;
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return psz_kmsg_erase(cxt, cxt->kpszs[record->id], record);
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case PSTORE_TYPE_PMSG:
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return psz_record_erase(cxt, cxt->ppsz);
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default:
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return -EINVAL;
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}
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@ -555,6 +699,55 @@ static int notrace psz_kmsg_write(struct psz_context *cxt,
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return 0;
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}
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static int notrace psz_record_write(struct pstore_zone *zone,
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struct pstore_record *record)
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{
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size_t start, rem;
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bool is_full_data = false;
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char *buf;
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int cnt;
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if (!zone || !record)
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return -ENOSPC;
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if (atomic_read(&zone->buffer->datalen) >= zone->buffer_size)
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is_full_data = true;
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cnt = record->size;
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buf = record->buf;
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if (unlikely(cnt > zone->buffer_size)) {
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buf += cnt - zone->buffer_size;
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cnt = zone->buffer_size;
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}
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start = buffer_start(zone);
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rem = zone->buffer_size - start;
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if (unlikely(rem < cnt)) {
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psz_zone_write(zone, FLUSH_PART, buf, rem, start);
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buf += rem;
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cnt -= rem;
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start = 0;
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is_full_data = true;
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}
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atomic_set(&zone->buffer->start, cnt + start);
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psz_zone_write(zone, FLUSH_PART, buf, cnt, start);
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/**
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* psz_zone_write will set datalen as start + cnt.
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* It work if actual data length lesser than buffer size.
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* If data length greater than buffer size, pmsg will rewrite to
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* beginning of zone, which make buffer->datalen wrongly.
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* So we should reset datalen as buffer size once actual data length
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* greater than buffer size.
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*/
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if (is_full_data) {
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atomic_set(&zone->buffer->datalen, zone->buffer_size);
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psz_zone_write(zone, FLUSH_META, NULL, 0, 0);
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}
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return 0;
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}
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static int notrace psz_pstore_write(struct pstore_record *record)
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{
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struct psz_context *cxt = record->psi->data;
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@ -566,6 +759,8 @@ static int notrace psz_pstore_write(struct pstore_record *record)
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switch (record->type) {
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case PSTORE_TYPE_DMESG:
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return psz_kmsg_write(cxt, record);
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case PSTORE_TYPE_PMSG:
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return psz_record_write(cxt->ppsz, record);
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default:
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return -EINVAL;
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}
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@ -581,6 +776,13 @@ 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->pmsg_read_cnt == 0) {
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cxt->pmsg_read_cnt++;
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zone = cxt->ppsz;
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if (psz_old_ok(zone))
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return zone;
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}
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return NULL;
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}
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@ -631,7 +833,7 @@ static ssize_t psz_kmsg_read(struct pstore_zone *zone,
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return -ENOMEM;
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}
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size = psz_zone_read(zone, record->buf + hlen, size,
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size = psz_zone_read_buffer(zone, record->buf + hlen, size,
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sizeof(struct psz_kmsg_header));
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if (unlikely(size < 0)) {
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kfree(record->buf);
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@ -641,6 +843,32 @@ 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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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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size_t len;
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struct psz_buffer *buf;
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if (!zone || !record)
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return -ENOSPC;
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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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len = atomic_read(&buf->datalen);
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record->buf = kmalloc(len, GFP_KERNEL);
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if (!record->buf)
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return -ENOMEM;
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if (unlikely(psz_zone_read_oldbuf(zone, record->buf, len, 0))) {
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kfree(record->buf);
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return -ENOMSG;
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}
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return len;
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}
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static ssize_t psz_pstore_read(struct pstore_record *record)
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{
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struct psz_context *cxt = record->psi->data;
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@ -665,6 +893,9 @@ 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_PMSG:
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readop = psz_record_read;
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break;
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default:
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goto next_zone;
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}
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@ -720,6 +951,8 @@ static void psz_free_all_zones(struct psz_context *cxt)
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{
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if (cxt->kpszs)
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psz_free_zones(&cxt->kpszs, &cxt->kmsg_max_cnt);
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if (cxt->ppsz)
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psz_free_zone(&cxt->ppsz);
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}
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static struct pstore_zone *psz_init_zone(enum pstore_type_id type,
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@ -753,8 +986,10 @@ static struct pstore_zone *psz_init_zone(enum pstore_type_id type,
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zone->type = type;
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zone->buffer_size = size - sizeof(struct psz_buffer);
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zone->buffer->sig = type ^ PSZ_SIG;
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zone->oldbuf = NULL;
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atomic_set(&zone->dirty, 0);
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atomic_set(&zone->buffer->datalen, 0);
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atomic_set(&zone->buffer->start, 0);
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*off += size;
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@ -809,19 +1044,28 @@ static int psz_alloc_zones(struct psz_context *cxt)
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struct pstore_zone_info *info = cxt->pstore_zone_info;
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loff_t off = 0;
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int err;
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size_t size;
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size_t off_size = 0;
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size = info->total_size;
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cxt->kpszs = psz_init_zones(PSTORE_TYPE_DMESG, &off, size,
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off_size += info->pmsg_size;
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cxt->ppsz = psz_init_zone(PSTORE_TYPE_PMSG, &off, info->pmsg_size);
|
||||
if (IS_ERR(cxt->ppsz)) {
|
||||
err = PTR_ERR(cxt->ppsz);
|
||||
cxt->ppsz = 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);
|
||||
if (IS_ERR(cxt->kpszs)) {
|
||||
err = PTR_ERR(cxt->kpszs);
|
||||
cxt->kpszs = NULL;
|
||||
goto fail_out;
|
||||
goto free_out;
|
||||
}
|
||||
|
||||
return 0;
|
||||
fail_out:
|
||||
free_out:
|
||||
psz_free_all_zones(cxt);
|
||||
return err;
|
||||
}
|
||||
|
||||
@ -844,7 +1088,7 @@ int register_pstore_zone(struct pstore_zone_info *info)
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (!info->kmsg_size) {
|
||||
if (!info->kmsg_size && !info->pmsg_size) {
|
||||
pr_warn("at least one record size must be non-zero\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
@ -866,6 +1110,7 @@ int register_pstore_zone(struct pstore_zone_info *info)
|
||||
|
||||
check_size(total_size, 4096);
|
||||
check_size(kmsg_size, SECTOR_SIZE);
|
||||
check_size(pmsg_size, SECTOR_SIZE);
|
||||
|
||||
#undef check_size
|
||||
|
||||
@ -891,6 +1136,7 @@ int register_pstore_zone(struct pstore_zone_info *info)
|
||||
pr_debug("register %s with properties:\n", info->name);
|
||||
pr_debug("\ttotal size : %ld Bytes\n", info->total_size);
|
||||
pr_debug("\tkmsg size : %ld Bytes\n", info->kmsg_size);
|
||||
pr_debug("\tpmsg size : %ld Bytes\n", info->pmsg_size);
|
||||
|
||||
err = psz_alloc_zones(cxt);
|
||||
if (err) {
|
||||
@ -920,6 +1166,10 @@ int register_pstore_zone(struct pstore_zone_info *info)
|
||||
pr_cont(",panic_write");
|
||||
pr_cont(")");
|
||||
}
|
||||
if (info->pmsg_size) {
|
||||
cxt->pstore.flags |= PSTORE_FLAGS_PMSG;
|
||||
pr_cont(" pmsg");
|
||||
}
|
||||
pr_cont("\n");
|
||||
|
||||
err = pstore_register(&cxt->pstore);
|
||||
|
||||
@ -17,6 +17,7 @@ typedef ssize_t (*pstore_zone_write_op)(const char *, size_t, loff_t);
|
||||
* @kmsg_size: The size of oops/panic zone. Zero means disabled, otherwise,
|
||||
* it must be multiple of SECTOR_SIZE(512 Bytes).
|
||||
* @max_reason: Maximum kmsg dump reason to store.
|
||||
* @pmsg_size: The size of pmsg zone which is the same as @kmsg_size.
|
||||
* @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
|
||||
@ -33,6 +34,7 @@ struct pstore_zone_info {
|
||||
unsigned long total_size;
|
||||
unsigned long kmsg_size;
|
||||
int max_reason;
|
||||
unsigned long pmsg_size;
|
||||
pstore_zone_read_op read;
|
||||
pstore_zone_write_op write;
|
||||
pstore_zone_write_op panic_write;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user