Add command queue initialization support. This is
applicable for emmc devices supporting cmd-queueing.
Signed-off-by: Asutosh Das <asutoshd@xxxxxxxxxxxxxx>
Signed-off-by: Konstantin Dorfman <kdorfman@xxxxxxxxxxxxxx>
---
drivers/mmc/card/queue.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++
drivers/mmc/card/queue.h | 6 ++++
include/linux/mmc/card.h | 2 ++
include/linux/mmc/host.h | 1 +
4 files changed, 83 insertions(+)
diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index 3e049c1..c99e385 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -403,6 +403,80 @@ void mmc_packed_clean(struct mmc_queue *mq)
mqrq_prev->packed = NULL;
}
+static void mmc_cmdq_softirq_done(struct request *rq)
+{
+ struct mmc_queue *mq = rq->q->queuedata;
+
+ mq->cmdq_complete_fn(rq);
+}
+
+int mmc_cmdq_init(struct mmc_queue *mq, struct mmc_card *card)
+{
+ int i, ret = 0;
+ /* one slot is reserved for dcmd requests */
+ int q_depth = card->ext_csd.cmdq_depth - 1;
+
+ card->cmdq_init = false;
+ if (!(card->host->caps2 & MMC_CAP2_CMD_QUEUE)) {
+ ret = -ENOTSUPP;
+ goto out;
+ }
+
+ mq->mqrq_cmdq = kzalloc(
+ sizeof(struct mmc_queue_req) * q_depth, GFP_KERNEL);
+ if (!mq->mqrq_cmdq) {
+ pr_warn("%s: unable to allocate mqrq's for q_depth %d\n",
+ mmc_card_name(card), q_depth);
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ for (i = 0; i < q_depth; i++) {
+ /* TODO: reduce the sg allocation by delaying them */
+ mq->mqrq_cmdq[i].sg = mmc_alloc_sg(card->host->max_segs, &ret);
+ if (ret) {
+ pr_warn("%s: unable to allocate cmdq sg of size %d\n",
+ mmc_card_name(card),
+ card->host->max_segs);
+ goto free_mqrq_sg;
+ }
+ }
+
+ ret = blk_queue_init_tags(mq->queue, q_depth, NULL);
+ if (ret) {
+ pr_warn("%s: unable to allocate cmdq tags %d\n",
+ mmc_card_name(card), q_depth);
+ goto free_mqrq_sg;
+ }
+
+ blk_queue_softirq_done(mq->queue, mmc_cmdq_softirq_done);
+ card->cmdq_init = true;
+ goto out;
+
+free_mqrq_sg:
+ for (i = 0; i < q_depth; i++)
+ kfree(mq->mqrq_cmdq[i].sg);
+ kfree(mq->mqrq_cmdq);
+ mq->mqrq_cmdq = NULL;
+out:
+ return ret;
+}
+
+void mmc_cmdq_clean(struct mmc_queue *mq, struct mmc_card *card)
+{
+ int i;
+ int q_depth = card->ext_csd.cmdq_depth - 1;
+
+ blk_free_tags(mq->queue->queue_tags);
+ mq->queue->queue_tags = NULL;
+ blk_queue_free_tags(mq->queue);
+
+ for (i = 0; i < q_depth; i++)
+ kfree(mq->mqrq_cmdq[i].sg);
+ kfree(mq->mqrq_cmdq);
+ mq->mqrq_cmdq = NULL;
+}
+
/**
* mmc_queue_suspend - suspend a MMC request queue
* @mq: MMC queue to suspend
diff --git a/drivers/mmc/card/queue.h b/drivers/mmc/card/queue.h
index 5752d50..36a8d64 100644
--- a/drivers/mmc/card/queue.h
+++ b/drivers/mmc/card/queue.h
@@ -52,11 +52,14 @@ struct mmc_queue {
#define MMC_QUEUE_NEW_REQUEST (1 << 1)
int (*issue_fn)(struct mmc_queue *, struct request *);
+ int (*cmdq_issue_fn)(struct mmc_queue *, struct request *);
+ void (*cmdq_complete_fn)(struct request *);
void *data;
struct request_queue *queue;
struct mmc_queue_req mqrq[2];
struct mmc_queue_req *mqrq_cur;
struct mmc_queue_req *mqrq_prev;
+ struct mmc_queue_req *mqrq_cmdq;
};
extern int mmc_init_queue(struct mmc_queue *, struct mmc_card *, spinlock_t *,
@@ -73,4 +76,7 @@ extern void mmc_queue_bounce_post(struct mmc_queue_req *);
extern int mmc_packed_init(struct mmc_queue *, struct mmc_card *);
extern void mmc_packed_clean(struct mmc_queue *);
+extern int mmc_cmdq_init(struct mmc_queue *mq, struct mmc_card *card);
+extern void mmc_cmdq_clean(struct mmc_queue *mq, struct mmc_card *card);
+
#endif
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index b87a27c..41f368d 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -309,6 +309,7 @@ struct mmc_card {
struct dentry *debugfs_root;
struct mmc_part part[MMC_NUM_PHY_PARTITION]; /* physical partitions */
unsigned int nr_parts;
+ bool cmdq_init; /* cmdq init done */
};
/*
@@ -545,4 +546,5 @@ extern void mmc_unregister_driver(struct mmc_driver *);
extern void mmc_fixup_device(struct mmc_card *card,
const struct mmc_fixup *table);
+extern void mmc_blk_cmdq_req_done(struct mmc_request *mrq);
#endif /* LINUX_MMC_CARD_H */
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index cb61ea4..f0edb36 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -278,6 +278,7 @@ struct mmc_host {
#define MMC_CAP2_PACKED_CMD (MMC_CAP2_PACKED_RD | \
MMC_CAP2_PACKED_WR)
#define MMC_CAP2_NO_PRESCAN_POWERUP (1 << 14) /* Don't power up before scan */
+#define MMC_CAP2_CMD_QUEUE (1 << 15) /* support eMMC command queue */
mmc_pm_flag_t pm_caps; /* supported pm features */
--
1.8.2.1
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a Linux Foundation Collaborative Project
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