commit f9c101523da75cd483b95f04c21242bb83960d93
author Javier González <jg@lightnvm.io> Mon Jun 26 11:57:20 2017 +0200
committer Jens Axboe <axboe@kernel.dk> Mon Jun 26 16:27:39 2017 -0600
tree a6d20ae407bb1768d844bab613f165617d7ddff3
parent 0880a9aa2d91ff5131ecd0902a758afe760b9c1c

lightnvm: pblk: issue multiplane reads if possible

If a read request is sequential and its size aligns with a
multi-plane page size, use the multi-plane hint to process the I/O in
parallel in the controller.

Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <matias@cnexlabs.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/lightnvm/pblk-recovery.c

diff --git a/drivers/lightnvm/pblk-recovery.c b/drivers/lightnvm/pblk-recovery.c
index 7b0ace2..b9f2b40 100644
--- a/drivers/lightnvm/pblk-recovery.c
+++ b/drivers/lightnvm/pblk-recovery.c
@@ -257,7 +257,6 @@ static int pblk_recov_read_oob(struct pblk *pblk, struct pblk_line *line,
 
 	rqd->bio = bio;
 	rqd->opcode = NVM_OP_PREAD;
-	rqd->flags = pblk_set_read_mode(pblk);
 	rqd->meta_list = meta_list;
 	rqd->nr_ppas = rq_ppas;
 	rqd->ppa_list = ppa_list;
@@ -266,6 +265,11 @@ static int pblk_recov_read_oob(struct pblk *pblk, struct pblk_line *line,
 	rqd->end_io = pblk_end_io_sync;
 	rqd->private = &wait;
 
+	if (pblk_io_aligned(pblk, rq_ppas))
+		rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
+	else
+		rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
+
 	for (i = 0; i < rqd->nr_ppas; ) {
 		struct ppa_addr ppa;
 		int pos;
@@ -473,7 +477,6 @@ static int pblk_recov_scan_all_oob(struct pblk *pblk, struct pblk_line *line,
 
 	rqd->bio = bio;
 	rqd->opcode = NVM_OP_PREAD;
-	rqd->flags = pblk_set_read_mode(pblk);
 	rqd->meta_list = meta_list;
 	rqd->nr_ppas = rq_ppas;
 	rqd->ppa_list = ppa_list;
@@ -482,6 +485,11 @@ static int pblk_recov_scan_all_oob(struct pblk *pblk, struct pblk_line *line,
 	rqd->end_io = pblk_end_io_sync;
 	rqd->private = &wait;
 
+	if (pblk_io_aligned(pblk, rq_ppas))
+		rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
+	else
+		rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
+
 	for (i = 0; i < rqd->nr_ppas; ) {
 		struct ppa_addr ppa;
 		int pos;
@@ -607,7 +615,6 @@ static int pblk_recov_scan_oob(struct pblk *pblk, struct pblk_line *line,
 
 	rqd->bio = bio;
 	rqd->opcode = NVM_OP_PREAD;
-	rqd->flags = pblk_set_read_mode(pblk);
 	rqd->meta_list = meta_list;
 	rqd->nr_ppas = rq_ppas;
 	rqd->ppa_list = ppa_list;
@@ -616,6 +623,11 @@ static int pblk_recov_scan_oob(struct pblk *pblk, struct pblk_line *line,
 	rqd->end_io = pblk_end_io_sync;
 	rqd->private = &wait;
 
+	if (pblk_io_aligned(pblk, rq_ppas))
+		rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
+	else
+		rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
+
 	for (i = 0; i < rqd->nr_ppas; ) {
 		struct ppa_addr ppa;
 		int pos;