diff mbox series

[RFC,4/6] lightnvm: pblk: Add pblk_submit_io_sem

Message ID 20180917052939.4776-5-hlitz@ucsc.edu (mailing list archive)
State New, archived
Headers show
Series lightnvm: pblk: Introduce RAIL to enforce low tail read latency | expand

Commit Message

Heiner Litz Sept. 17, 2018, 5:29 a.m. UTC 
In preparation of supporting RAIL, add a new API pblk_submit_io_sem which
takes the lun semaphore before submitting the asynchronous request.

Signed-off-by: Heiner Litz <hlitz@ucsc.edu>
---
 drivers/lightnvm/pblk-core.c | 11 +++++++++++
 drivers/lightnvm/pblk.h      |  1 +
 2 files changed, 12 insertions(+)
diff mbox series

Patch

diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
index 2e40666fdf80..a31bf359f905 100644
--- a/drivers/lightnvm/pblk-core.c
+++ b/drivers/lightnvm/pblk-core.c
@@ -492,6 +492,17 @@  int pblk_submit_io(struct pblk *pblk, struct nvm_rq *rqd)
 	return nvm_submit_io(dev, rqd);
 }
 
+int pblk_submit_io_sem(struct pblk *pblk, struct nvm_rq *rqd)
+{
+	struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
+	int ret;
+
+	pblk_down_chunk(pblk, ppa_list[0]);
+	ret = pblk_submit_io(pblk, rqd);
+
+	return ret;
+}
+
 void pblk_check_chunk_state_update(struct pblk *pblk, struct nvm_rq *rqd)
 {
 	struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h
index 64d9c206ec52..bd88784e51d9 100644
--- a/drivers/lightnvm/pblk.h
+++ b/drivers/lightnvm/pblk.h
@@ -797,6 +797,7 @@  struct nvm_chk_meta *pblk_chunk_get_off(struct pblk *pblk,
 void pblk_log_write_err(struct pblk *pblk, struct nvm_rq *rqd);
 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_sem(struct pblk *pblk, struct nvm_rq *rqd);
 int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd);
 int pblk_submit_io_sync_sem(struct pblk *pblk, struct nvm_rq *rqd);
 int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line);