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>

1 files changed, 20 insertions, 2 deletions

diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h
index 50f30434718f..6dc58d360077 100644
--- a/drivers/lightnvm/pblk.h
+++ b/drivers/lightnvm/pblk.h
@@ -1075,9 +1075,27 @@ 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)
+{
+        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 NVM_IO_SNGL_ACCESS | NVM_IO_SUSPEND | NVM_IO_SCRAMBLE_ENABLE;
+        return !(nr_secs % pblk->min_write_pgs);
 }
 
 #ifdef CONFIG_NVM_DEBUG