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Message-Id: <1498471049-25505-12-git-send-email-javier@cnexlabs.com>
Date: Mon, 26 Jun 2017 11:57:20 +0200
From: "Javier González" <jg@...htnvm.io>
To: mb@...htnvm.io, axboe@...com
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
Javier González <javier@...xlabs.com>,
Matias Bjørling <matias@...xlabs.com>
Subject: [PATCH 11/20] 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@...xlabs.com>
Signed-off-by: Matias Bjørling <matias@...xlabs.com>
---
drivers/lightnvm/pblk-core.c | 12 +++++++-----
drivers/lightnvm/pblk-read.c | 11 +++++++++--
drivers/lightnvm/pblk-recovery.c | 18 +++++++++++++++---
drivers/lightnvm/pblk.h | 22 ++++++++++++++++++++--
4 files changed, 51 insertions(+), 12 deletions(-)
diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
index beae1618483f..29565f89a85e 100644
--- a/drivers/lightnvm/pblk-core.c
+++ b/drivers/lightnvm/pblk-core.c
@@ -564,7 +564,6 @@ static int pblk_line_submit_emeta_io(struct pblk *pblk, struct pblk_line *line,
int id = line->id;
int rq_ppas, rq_len;
int cmd_op, bio_op;
- int flags;
int i, j;
int ret;
DECLARE_COMPLETION_ONSTACK(wait);
@@ -572,11 +571,9 @@ static int pblk_line_submit_emeta_io(struct pblk *pblk, struct pblk_line *line,
if (dir == WRITE) {
bio_op = REQ_OP_WRITE;
cmd_op = NVM_OP_PWRITE;
- flags = pblk_set_progr_mode(pblk, WRITE);
} else if (dir == READ) {
bio_op = REQ_OP_READ;
cmd_op = NVM_OP_PREAD;
- flags = pblk_set_read_mode(pblk);
} else
return -EINVAL;
@@ -601,7 +598,6 @@ static int pblk_line_submit_emeta_io(struct pblk *pblk, struct pblk_line *line,
rqd.bio = bio;
rqd.opcode = cmd_op;
- rqd.flags = flags;
rqd.nr_ppas = rq_ppas;
rqd.ppa_list = ppa_list;
rqd.dma_ppa_list = dma_ppa_list;
@@ -609,6 +605,7 @@ static int pblk_line_submit_emeta_io(struct pblk *pblk, struct pblk_line *line,
rqd.private = &wait;
if (dir == WRITE) {
+ rqd.flags = pblk_set_progr_mode(pblk, WRITE);
for (i = 0; i < rqd.nr_ppas; ) {
spin_lock(&line->lock);
paddr = __pblk_alloc_page(pblk, line, min);
@@ -621,6 +618,11 @@ static int pblk_line_submit_emeta_io(struct pblk *pblk, struct pblk_line *line,
for (i = 0; i < rqd.nr_ppas; ) {
struct ppa_addr ppa = addr_to_gen_ppa(pblk, paddr, id);
int pos = pblk_dev_ppa_to_pos(geo, ppa);
+ int read_type = PBLK_READ_RANDOM;
+
+ if (pblk_io_aligned(pblk, rq_ppas))
+ read_type = PBLK_READ_SEQUENTIAL;
+ rqd.flags = pblk_set_read_mode(pblk, read_type);
while (test_bit(pos, line->blk_bitmap)) {
paddr += min;
@@ -717,7 +719,7 @@ static int pblk_line_submit_smeta_io(struct pblk *pblk, struct pblk_line *line,
} else if (dir == READ) {
bio_op = REQ_OP_READ;
cmd_op = NVM_OP_PREAD;
- flags = pblk_set_read_mode(pblk);
+ flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
} else
return -EINVAL;
diff --git a/drivers/lightnvm/pblk-read.c b/drivers/lightnvm/pblk-read.c
index cea958e96fc3..d6499cdb7d33 100644
--- a/drivers/lightnvm/pblk-read.c
+++ b/drivers/lightnvm/pblk-read.c
@@ -88,6 +88,11 @@ static void pblk_read_ppalist_rq(struct pblk *pblk, struct nvm_rq *rqd,
bio_advance(bio, PBLK_EXPOSED_PAGE_SIZE);
}
+ if (pblk_io_aligned(pblk, nr_secs))
+ rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL);
+ else
+ rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
+
#ifdef CONFIG_NVM_DEBUG
atomic_long_add(nr_secs, &pblk->inflight_reads);
#endif
@@ -97,8 +102,6 @@ static int pblk_submit_read_io(struct pblk *pblk, struct nvm_rq *rqd)
{
int err;
- rqd->flags = pblk_set_read_mode(pblk);
-
err = pblk_submit_io(pblk, rqd);
if (err)
return NVM_IO_ERR;
@@ -177,6 +180,7 @@ static int pblk_fill_partial_read_bio(struct pblk *pblk, struct nvm_rq *rqd,
rqd->bio = new_bio;
rqd->nr_ppas = nr_holes;
+ rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
rqd->end_io = NULL;
if (unlikely(nr_secs > 1 && nr_holes == 1)) {
@@ -290,6 +294,8 @@ static void pblk_read_rq(struct pblk *pblk, struct nvm_rq *rqd,
} else {
rqd->ppa_addr = ppa;
}
+
+ rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
}
int pblk_submit_read(struct pblk *pblk, struct bio *bio)
@@ -497,6 +503,7 @@ int pblk_submit_read_gc(struct pblk *pblk, u64 *lba_list, void *data,
rqd.end_io = pblk_end_io_sync;
rqd.private = &wait;
rqd.nr_ppas = *secs_to_gc;
+ rqd.flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM);
rqd.bio = bio;
ret = pblk_submit_read_io(pblk, &rqd);
diff --git a/drivers/lightnvm/pblk-recovery.c b/drivers/lightnvm/pblk-recovery.c
index 7b0ace2f4957..b9f2b40bd5a7 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;
diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h
index 407d15c69fb4..eb8515fd9044 100644
--- a/drivers/lightnvm/pblk.h
+++ b/drivers/lightnvm/pblk.h
@@ -1074,9 +1074,27 @@ static inline int pblk_set_progr_mode(struct pblk *pblk, int type)
return flags;
}
-static inline int pblk_set_read_mode(struct pblk *pblk)
+enum {
+ PBLK_READ_RANDOM = 0,
+ PBLK_READ_SEQUENTIAL = 1,
+};
+
+static inline int pblk_set_read_mode(struct pblk *pblk, int type)
{
- return NVM_IO_SNGL_ACCESS | NVM_IO_SUSPEND | NVM_IO_SCRAMBLE_ENABLE;
+ struct nvm_tgt_dev *dev = pblk->dev;
+ struct nvm_geo *geo = &dev->geo;
+ int flags;
+
+ flags = NVM_IO_SUSPEND | NVM_IO_SCRAMBLE_ENABLE;
+ if (type == PBLK_READ_SEQUENTIAL)
+ flags |= geo->plane_mode >> 1;
+
+ return flags;
+}
+
+static inline int pblk_io_aligned(struct pblk *pblk, int nr_secs)
+{
+ return !(nr_secs % pblk->min_write_pgs);
}
#ifdef CONFIG_NVM_DEBUG
--
2.7.4
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