mmc: block: Add blk-mq support
Define and use a blk-mq queue. Discards and flushes are processed
synchronously, but reads and writes asynchronously. In order to support
slow DMA unmapping, DMA unmapping is not done until after the next request
is started. That means the request is not completed until then. If there is
no next request then the completion is done by queued work.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/mmc/core/queue.h b/drivers/mmc/core/queue.h
index 547b457..ce92498 100644
--- a/drivers/mmc/core/queue.h
+++ b/drivers/mmc/core/queue.h
@@ -8,6 +8,19 @@
#include <linux/mmc/core.h>
#include <linux/mmc/host.h>
+enum mmc_issued {
+ MMC_REQ_STARTED,
+ MMC_REQ_BUSY,
+ MMC_REQ_FAILED_TO_START,
+ MMC_REQ_FINISHED,
+};
+
+enum mmc_issue_type {
+ MMC_ISSUE_SYNC,
+ MMC_ISSUE_ASYNC,
+ MMC_ISSUE_MAX,
+};
+
static inline struct mmc_queue_req *req_to_mmc_queue_req(struct request *rq)
{
return blk_mq_rq_to_pdu(rq);
@@ -57,12 +70,15 @@ struct mmc_queue_req {
int drv_op_result;
void *drv_op_data;
unsigned int ioc_count;
+ int retries;
};
struct mmc_queue {
struct mmc_card *card;
struct task_struct *thread;
struct semaphore thread_sem;
+ struct mmc_ctx ctx;
+ struct blk_mq_tag_set tag_set;
bool suspended;
bool asleep;
struct mmc_blk_data *blkdata;
@@ -74,6 +90,14 @@ struct mmc_queue {
* associated mmc_queue_req data.
*/
int qcnt;
+
+ int in_flight[MMC_ISSUE_MAX];
+ bool rw_wait;
+ bool waiting;
+ wait_queue_head_t wait;
+ struct request *complete_req;
+ struct mutex complete_lock;
+ struct work_struct complete_work;
};
extern int mmc_init_queue(struct mmc_queue *, struct mmc_card *, spinlock_t *,
@@ -84,4 +108,12 @@ extern void mmc_queue_resume(struct mmc_queue *);
extern unsigned int mmc_queue_map_sg(struct mmc_queue *,
struct mmc_queue_req *);
+enum mmc_issue_type mmc_issue_type(struct mmc_queue *mq, struct request *req);
+
+static inline int mmc_tot_in_flight(struct mmc_queue *mq)
+{
+ return mq->in_flight[MMC_ISSUE_SYNC] +
+ mq->in_flight[MMC_ISSUE_ASYNC];
+}
+
#endif