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authorKonstantin Dorfman <kdorfman@codeaurora.org>2013-01-14 14:28:17 -0500
committerChris Ball <cjb@laptop.org>2013-02-11 13:28:49 -0500
commit2220eedfd7aea69008173a224975e10284fbe854 (patch)
tree71906c2638d2e0052b15a40e71310f6984f3ee8f /include/linux/mmc/card.h
parent369d321ed1baa7748e770aaaae4d8effad699633 (diff)
mmc: fix async request mechanism for sequential read scenarios
When current request is running on the bus and if next request fetched by mmcqd is NULL, mmc context (mmcqd thread) gets blocked until the current request completes. This means that if new request comes in while the mmcqd thread is blocked, this new request can not be prepared in parallel to current ongoing request. This may result in delaying the new request execution and increase it's latency. This change allows to wake up the MMC thread on new request arrival. Now once the MMC thread is woken up, a new request can be fetched and prepared in parallel to the current running request which means this new request can be started immediately after the current running request completes. With this change read throughput is improved by 16%. Signed-off-by: Konstantin Dorfman <kdorfman@codeaurora.org> Reviewed-by: Seungwon Jeon <tgih.jun@samsung.com> Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'include/linux/mmc/card.h')
-rw-r--r--include/linux/mmc/card.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 5c69315d60cc..be2500a49925 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -187,6 +187,18 @@ struct sdio_func_tuple;
#define SDIO_MAX_FUNCS 7
+enum mmc_blk_status {
+ MMC_BLK_SUCCESS = 0,
+ MMC_BLK_PARTIAL,
+ MMC_BLK_CMD_ERR,
+ MMC_BLK_RETRY,
+ MMC_BLK_ABORT,
+ MMC_BLK_DATA_ERR,
+ MMC_BLK_ECC_ERR,
+ MMC_BLK_NOMEDIUM,
+ MMC_BLK_NEW_REQUEST,
+};
+
/* The number of MMC physical partitions. These consist of:
* boot partitions (2), general purpose partitions (4) in MMC v4.4.
*/