From: Abbas Raza <Abbas_Raza@xxxxxxxxxx>
Idea behind this patch is to skip all the regular block io operations
for RPMB partitions because these are not regular partitions and require
a different command sequence for reading and writing. RPMB partitions
should only be accessed via ioctl. Without this patch we see following
issues with some eMMC devices
dd if=/dev/mmcblk1rpmb of=/dev/null bs=1 count=1
[ 124.185513] mmcblk1rpmb: error -110 transferring data, sector 0, nr 32, cmd response 0x900, card status 0xb00
[ 124.195506] mmcblk1rpmb: retrying using single block read
[ 124.201035] mmcblk1rpmb: timed out sending r/w cmd command, card status 0x400900
[ 124.208559] mmcblk1rpmb: timed out sending r/w cmd command, card status 0x400900
[ 124.216049] mmcblk1rpmb: timed out sending r/w cmd command, card status 0x400900
[ 124.223567] mmcblk1rpmb: timed out sending r/w cmd command, card status 0x400900
[ 124.231087] mmcblk1rpmb: timed out sending r/w cmd command, card status 0x400900
[ 124.238600] mmcblk1rpmb: timed out sending r/w cmd command, card status 0x400900
[ 124.246012] end_request: I/O error, dev mmcblk1rpmb, sector 0
[ 124.251773] Buffer I/O error on device mmcblk1rpmb, logical block 0
[ 124.258065] end_request: I/O error, dev mmcblk1rpmb, sector 8
[ 124.263822] Buffer I/O error on device mmcblk1rpmb, logical block 1
[ 124.270102] end_request: I/O error, dev mmcblk1rpmb, sector 16
[ 124.275944] Buffer I/O error on device mmcblk1rpmb, logical block 2
[ 124.282222] end_request: I/O error, dev mmcblk1rpmb, sector 24
[ 124.288064] Buffer I/O error on device mmcblk1rpmb, logical block 3
[ 129.717711] mmcblk1rpmb: error -110 transferring data, sector 0, nr 8, cmd response 0x900, card status 0xb00
[ 129.727590] mmcblk1rpmb: retrying using single block read
[ 129.733088] mmcblk1rpmb: timed out sending r/w cmd command, card status 0x400900
[ 129.740605] mmcblk1rpmb: timed out sending r/w cmd command, card status 0x400900
[ 129.748121] mmcblk1rpmb: timed out sending r/w cmd command, card status 0x400900
[ 129.755612] mmcblk1rpmb: timed out sending r/w cmd command, card status 0x400900
[ 129.763125] mmcblk1rpmb: timed out sending r/w cmd command, card status 0x400900
[ 129.770639] mmcblk1rpmb: timed out sending r/w cmd command, card status 0x400900
[ 129.778073] end_request: I/O error, dev mmcblk1rpmb, sector 0
[ 129.783834] Buffer I/O error on device mmcblk1rpmb, logical block 0
dd: /dev/mmcblk1rpmb: Input/output error
Cc: Loic Pallardy <loic.pallardy@xxxxxxxxxxxxxx>
Cc: Chris Ball <cjb@xxxxxxxxxx>
Signed-off-by: Abbas Raza <Abbas_Raza@xxxxxxxxxx>
---
drivers/mmc/card/block.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index a376ad1..93fbe66 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -1489,6 +1489,13 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
/* claim host only for the first request */
mmc_claim_host(card->host);
+ if (md->area_type & MMC_BLK_DATA_AREA_RPMB) {
+ if (req)
+ blk_end_request_all(req, 0);
+ ret = 0;
+ goto out;
+ }
+
ret = mmc_blk_part_switch(card, md);
if (ret) {
if (req) {
--
1.8.3.2
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