mmc: block: Add write packing control
The write packing control will ensure that read requests latency is
not increased due to long write packed commands.
The trigger for enabling the write packing is managing to pack several
write requests. The number of potential packed requests that will trigger
the packing can be configured via sysfs by writing the required value to:
/sys/block/<block_dev_name>/num_wr_reqs_to_start_packing.
The trigger for disabling the write packing is fetching a read request.
(cherry picked from commit 0cc76400d65f0d7b3f2f8f1ece3c8061652a35d7)
Change-Id: I51a44d2673e40e4e404317ddb632a9fb204e9a06
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org>
(cherry picked from commit fd402c28f1571b64f4d695d191778e9dd595806a)
diff --git a/drivers/mmc/card/queue.h b/drivers/mmc/card/queue.h
index 5e04938..93e4b59 100644
--- a/drivers/mmc/card/queue.h
+++ b/drivers/mmc/card/queue.h
@@ -45,6 +45,9 @@
struct mmc_queue_req mqrq[2];
struct mmc_queue_req *mqrq_cur;
struct mmc_queue_req *mqrq_prev;
+ bool wr_packing_enabled;
+ int num_of_potential_packed_wr_reqs;
+ int num_wr_reqs_to_start_packing;
};
extern int mmc_init_queue(struct mmc_queue *, struct mmc_card *, spinlock_t *,