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Date: Wed, 29 Aug 2018 14:31:14 +0200
From: Hans Holmberg <hans.ml.holmberg@...tronix.com>
To: Matias Bjorling <mb@...htnvm.io>
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
Javier Gonzales <javier@...xlabs.com>,
Hans Holmberg <hans.holmberg@...xlabs.com>
Subject: [PATCH 1/4] lightnvm: pblk: add trace events for chunk states
From: Hans Holmberg <hans.holmberg@...xlabs.com>
Introduce trace points for tracking chunk states in pblk - this is
useful for inspection of the entire state of the drive, and real handy
for both fw and pblk debugging.
Signed-off-by: Hans Holmberg <hans.holmberg@...xlabs.com>
---
drivers/lightnvm/pblk-core.c | 35 +++++++++++++++++++++++++++-
drivers/lightnvm/pblk-init.c | 4 ++++
drivers/lightnvm/pblk-trace.h | 53 +++++++++++++++++++++++++++++++++++++++++++
drivers/lightnvm/pblk-write.c | 10 ++++++--
drivers/lightnvm/pblk.h | 8 +++++++
5 files changed, 107 insertions(+), 3 deletions(-)
create mode 100644 drivers/lightnvm/pblk-trace.h
diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
index f7bff3ae52ac..4da37e29bb06 100644
--- a/drivers/lightnvm/pblk-core.c
+++ b/drivers/lightnvm/pblk-core.c
@@ -16,7 +16,10 @@
*
*/
+#define CREATE_TRACE_POINTS
+
#include "pblk.h"
+#include "pblk-trace.h"
static void pblk_line_mark_bb(struct work_struct *work)
{
@@ -93,6 +96,9 @@ static void __pblk_end_io_erase(struct pblk *pblk, struct nvm_rq *rqd)
chunk->state = NVM_CHK_ST_FREE;
}
+ trace_pblk_chunk_state(pblk_disk_name(pblk), &rqd->ppa_addr,
+ chunk->state);
+
atomic_dec(&pblk->inflight_io);
}
@@ -477,9 +483,30 @@ int pblk_submit_io(struct pblk *pblk, struct nvm_rq *rqd)
return nvm_submit_io(dev, rqd);
}
+void pblk_check_chunk_state_update(struct pblk *pblk, struct nvm_rq *rqd)
+{
+ struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
+
+ int i;
+
+ for (i = 0; i < rqd->nr_ppas; i++) {
+ struct ppa_addr *ppa = &ppa_list[i];
+ struct nvm_chk_meta *chunk = pblk_dev_ppa_to_chunk(pblk, *ppa);
+ u64 caddr = pblk_dev_ppa_to_chunk_addr(pblk, *ppa);
+
+ if (caddr == 0)
+ trace_pblk_chunk_state(pblk_disk_name(pblk),
+ ppa, NVM_CHK_ST_OPEN);
+ else if (caddr == chunk->cnlb)
+ trace_pblk_chunk_state(pblk_disk_name(pblk),
+ ppa, NVM_CHK_ST_CLOSED);
+ }
+}
+
int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd)
{
struct nvm_tgt_dev *dev = pblk->dev;
+ int ret;
atomic_inc(&pblk->inflight_io);
@@ -488,7 +515,13 @@ int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd)
return NVM_IO_ERR;
#endif
- return nvm_submit_io_sync(dev, rqd);
+ ret = nvm_submit_io_sync(dev, rqd);
+
+ if (trace_pblk_chunk_state_enabled() && !ret &&
+ rqd->opcode == NVM_OP_PWRITE)
+ pblk_check_chunk_state_update(pblk, rqd);
+
+ return ret;
}
static void pblk_bio_map_addr_endio(struct bio *bio)
diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
index 0be64220b5d8..3f8bae9be852 100644
--- a/drivers/lightnvm/pblk-init.c
+++ b/drivers/lightnvm/pblk-init.c
@@ -19,6 +19,7 @@
*/
#include "pblk.h"
+#include "pblk-trace.h"
static unsigned int write_buffer_size;
@@ -650,6 +651,9 @@ static int pblk_setup_line_meta_chk(struct pblk *pblk, struct pblk_line *line,
chunk->cnlb = chunk_meta->cnlb;
chunk->wp = chunk_meta->wp;
+ trace_pblk_chunk_state(pblk_disk_name(pblk), &ppa,
+ chunk->state);
+
if (chunk->type & NVM_CHK_TP_SZ_SPEC) {
WARN_ONCE(1, "pblk: custom-sized chunks unsupported\n");
continue;
diff --git a/drivers/lightnvm/pblk-trace.h b/drivers/lightnvm/pblk-trace.h
new file mode 100644
index 000000000000..d985b729428f
--- /dev/null
+++ b/drivers/lightnvm/pblk-trace.h
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM pblk
+
+#if !defined(_TRACE_PBLK_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_PBLK_H
+
+#include <linux/tracepoint.h>
+
+struct ppa_addr;
+
+#define show_chunk_flags(state) __print_flags(state, "", \
+ { NVM_CHK_ST_FREE, "FREE", }, \
+ { NVM_CHK_ST_CLOSED, "CLOSED", }, \
+ { NVM_CHK_ST_OPEN, "OPEN", }, \
+ { NVM_CHK_ST_OFFLINE, "OFFLINE", })
+
+TRACE_EVENT(pblk_chunk_state,
+
+ TP_PROTO(const char *name, struct ppa_addr *ppa, int state),
+
+ TP_ARGS(name, ppa, state),
+
+ TP_STRUCT__entry(
+ __string(name, name)
+ __field(u64, ppa)
+ __field(int, state);
+ ),
+
+ TP_fast_assign(
+ __assign_str(name, name);
+ __entry->ppa = ppa->ppa;
+ __entry->state = state;
+ ),
+
+ TP_printk("dev=%s grp=%llu pu=%llu chk=%llu state=%s", __get_str(name),
+ (u64)(((struct ppa_addr *)(&__entry->ppa))->m.grp),
+ (u64)(((struct ppa_addr *)(&__entry->ppa))->m.pu),
+ (u64)(((struct ppa_addr *)(&__entry->ppa))->m.chk),
+ show_chunk_flags((int)__entry->state))
+
+);
+
+
+#endif /* !defined(_TRACE_PBLK_H) || defined(TRACE_HEADER_MULTI_READ) */
+
+/* This part must be outside protection */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH ../../../drivers/lightnvm
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE pblk-trace
+#include <trace/define_trace.h>
diff --git a/drivers/lightnvm/pblk-write.c b/drivers/lightnvm/pblk-write.c
index 8aa4b9ee5092..bb656cbd5d3e 100644
--- a/drivers/lightnvm/pblk-write.c
+++ b/drivers/lightnvm/pblk-write.c
@@ -16,6 +16,7 @@
*/
#include "pblk.h"
+#include "pblk-trace.h"
static unsigned long pblk_end_w_bio(struct pblk *pblk, struct nvm_rq *rqd,
struct pblk_c_ctx *c_ctx)
@@ -278,11 +279,13 @@ static void pblk_end_io_write(struct nvm_rq *rqd)
if (rqd->error) {
pblk_end_w_fail(pblk, rqd);
return;
- }
+ } else {
+ if (trace_pblk_chunk_state_enabled())
+ pblk_check_chunk_state_update(pblk, rqd);
#ifdef CONFIG_NVM_PBLK_DEBUG
- else
WARN_ONCE(rqd->bio->bi_status, "pblk: corrupted write error\n");
#endif
+ }
pblk_complete_write(pblk, rqd, c_ctx);
atomic_dec(&pblk->inflight_io);
@@ -303,6 +306,9 @@ static void pblk_end_io_write_meta(struct nvm_rq *rqd)
pblk_log_write_err(pblk, rqd);
pblk_err(pblk, "metadata I/O failed. Line %d\n", line->id);
line->w_err_gc->has_write_err = 1;
+ } else {
+ if (trace_pblk_chunk_state_enabled())
+ pblk_check_chunk_state_update(pblk, rqd);
}
sync = atomic_add_return(rqd->nr_ppas, &emeta->sync);
diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h
index 1bdac22e7897..ed17db2cae2c 100644
--- a/drivers/lightnvm/pblk.h
+++ b/drivers/lightnvm/pblk.h
@@ -785,6 +785,7 @@ void pblk_log_read_err(struct pblk *pblk, struct nvm_rq *rqd);
int pblk_submit_io(struct pblk *pblk, struct nvm_rq *rqd);
int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd);
int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line);
+void pblk_check_chunk_state_update(struct pblk *pblk, struct nvm_rq *rqd);
struct bio *pblk_bio_map_addr(struct pblk *pblk, void *data,
unsigned int nr_secs, unsigned int len,
int alloc_type, gfp_t gfp_mask);
@@ -1440,4 +1441,11 @@ static inline void pblk_setup_uuid(struct pblk *pblk)
uuid_le_gen(&uuid);
memcpy(pblk->instance_uuid, uuid.b, 16);
}
+
+static inline char *pblk_disk_name(struct pblk *pblk)
+{
+ struct gendisk *disk = pblk->disk;
+
+ return disk->disk_name;
+}
#endif /* PBLK_H_ */
--
2.7.4
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