Re: [PATCH 13/16] mmc: queue: issue struct mmc_queue_req items

Bartlomiej Zolnierkiewicz
2017-02-28T18:42:25Z

On Thursday, February 09, 2017 04:34:00 PM Linus Walleij wrote:
> Instead of passing two pointers around and messing and reassigning
> to the left and right, issue mmc_queue_req and dereference
> the queue from the request where needed. The struct mmc_queue_req
> is the thing that has a lifecycle after all: this is what we are
> keepin in out queue. Augment all users to be passed the struct
> mmc_queue_req as well.
>
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
> ---
> drivers/mmc/core/block.c | 88 ++++++++++++++++++++++++------------------------
> drivers/mmc/core/block.h | 5 ++-
> drivers/mmc/core/queue.c | 6 ++--
> 3 files changed, 50 insertions(+), 49 deletions(-)
>
> diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
> index 4952a105780e..628a22b9bf41 100644
> --- a/drivers/mmc/core/block.c
> +++ b/drivers/mmc/core/block.c
> @@ -1151,9 +1151,9 @@ int mmc_access_rpmb(struct mmc_queue *mq)
> return false;
> }
>
> -static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
> +static void mmc_blk_issue_discard_rq(struct mmc_queue_req *mq_rq)
> {
> - struct mmc_blk_data *md = mq->blkdata;
> + struct mmc_blk_data *md = mq_rq->mq->blkdata;
> struct mmc_card *card = md->queue.card;
> unsigned int from, nr, arg;
> int err = 0, type = MMC_BLK_DISCARD;
> @@ -1163,8 +1163,8 @@ static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
> goto fail;
> }
>
> - from = blk_rq_pos(req);
> - nr = blk_rq_sectors(req);
> + from = blk_rq_pos(mq_rq->req);
> + nr = blk_rq_sectors(mq_rq->req);
>
> if (mmc_can_discard(card))
> arg = MMC_DISCARD_ARG;
> @@ -1188,13 +1188,12 @@ static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
> if (!err)
> mmc_blk_reset_success(md, type);
> fail:
> - blk_end_request(req, err, blk_rq_bytes(req));
> + blk_end_request(mq_rq->req, err, blk_rq_bytes(mq_rq->req));
> }
>
> -static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
> - struct request *req)
> +static void mmc_blk_issue_secdiscard_rq(struct mmc_queue_req *mq_rq)
> {
> - struct mmc_blk_data *md = mq->blkdata;
> + struct mmc_blk_data *md = mq_rq->mq->blkdata;
> struct mmc_card *card = md->queue.card;
> unsigned int from, nr, arg;
> int err = 0, type = MMC_BLK_SECDISCARD;
> @@ -1204,8 +1203,8 @@ static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
> goto out;
> }
>
> - from = blk_rq_pos(req);
> - nr = blk_rq_sectors(req);
> + from = blk_rq_pos(mq_rq->req);
> + nr = blk_rq_sectors(mq_rq->req);
>
> if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
> arg = MMC_SECURE_TRIM1_ARG;
> @@ -1253,12 +1252,12 @@ static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
> if (!err)
> mmc_blk_reset_success(md, type);
> out:
> - blk_end_request(req, err, blk_rq_bytes(req));
> + blk_end_request(mq_rq->req, err, blk_rq_bytes(mq_rq->req));
> }
>
> -static void mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
> +static void mmc_blk_issue_flush(struct mmc_queue_req *mq_rq)
> {
> - struct mmc_blk_data *md = mq->blkdata;
> + struct mmc_blk_data *md = mq_rq->mq->blkdata;
> struct mmc_card *card = md->queue.card;
> int ret = 0;
>
> @@ -1266,7 +1265,7 @@ static void mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
> if (ret)
> ret = -EIO;
>
> - blk_end_request_all(req, ret);
> + blk_end_request_all(mq_rq->req, ret);
> }
>
> /*
> @@ -1614,11 +1613,13 @@ static void mmc_blk_rw_cmd_abort(struct mmc_card *card, struct request *req)
> * @mq: the queue with the card and host to restart
> * @req: a new request that want to be started after the current one
> */
> -static void mmc_blk_rw_try_restart(struct mmc_queue *mq)
> +static void mmc_blk_rw_try_restart(struct mmc_queue_req *mq_rq)
> {
> + struct mmc_queue *mq = mq_rq->mq;
> +
> /* Proceed and try to restart the current async request */
> - mmc_blk_rw_rq_prep(mq->mqrq_cur, mq->card, 0, mq);
> - mmc_restart_areq(mq->card->host, &mq->mqrq_cur->areq);
> + mmc_blk_rw_rq_prep(mq_rq, mq->card, 0, mq);
> + mmc_restart_areq(mq->card->host, &mq_rq->areq);
> }
>
> void mmc_blk_rw_done(struct mmc_async_req *areq,
> @@ -1676,11 +1677,11 @@ void mmc_blk_rw_done(struct mmc_async_req *areq,
> req_pending = mmc_blk_rw_cmd_err(md, card, brq, old_req, req_pending);
> if (mmc_blk_reset(md, host, type)) {
> mmc_blk_rw_cmd_abort(card, old_req);
> - mmc_blk_rw_try_restart(mq);
> + mmc_blk_rw_try_restart(mq_rq);
> return;
> }
> if (!req_pending) {
> - mmc_blk_rw_try_restart(mq);
> + mmc_blk_rw_try_restart(mq_rq);
> return;
> }
> break;
> @@ -1693,7 +1694,7 @@ void mmc_blk_rw_done(struct mmc_async_req *areq,
> if (!mmc_blk_reset(md, host, type))
> break;
> mmc_blk_rw_cmd_abort(card, old_req);
> - mmc_blk_rw_try_restart(mq);
> + mmc_blk_rw_try_restart(mq_rq);
> return;
> case MMC_BLK_DATA_ERR: {
> int err;
> @@ -1702,7 +1703,7 @@ void mmc_blk_rw_done(struct mmc_async_req *areq,
> break;
> if (err == -ENODEV) {
> mmc_blk_rw_cmd_abort(card, old_req);
> - mmc_blk_rw_try_restart(mq);
> + mmc_blk_rw_try_restart(mq_rq);
> return;
> }
> /* Fall through */
> @@ -1723,19 +1724,19 @@ void mmc_blk_rw_done(struct mmc_async_req *areq,
> req_pending = blk_end_request(old_req, -EIO,
> brq->data.blksz);
> if (!req_pending) {
> - mmc_blk_rw_try_restart(mq);
> + mmc_blk_rw_try_restart(mq_rq);
> return;
> }
> break;
> case MMC_BLK_NOMEDIUM:
> mmc_blk_rw_cmd_abort(card, old_req);
> - mmc_blk_rw_try_restart(mq);
> + mmc_blk_rw_try_restart(mq_rq);
> return;
> default:
> pr_err("%s: Unhandled return value (%d)",
> old_req->rq_disk->disk_name, status);
> mmc_blk_rw_cmd_abort(card, old_req);
> - mmc_blk_rw_try_restart(mq);
> + mmc_blk_rw_try_restart(mq_rq);
> return;
> }
>
> @@ -1747,15 +1748,16 @@ void mmc_blk_rw_done(struct mmc_async_req *areq,
> mmc_blk_rw_rq_prep(mq_rq, card,
> disable_multi, mq);
> mq_rq->brq.retune_retry_done = retune_retry_done;
> - mmc_restart_areq(host, &mq->mqrq_cur->areq);
> + mmc_restart_areq(host, &mq_rq->areq);
> }
> }
>
> -static void mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *new_req)
> +static void mmc_blk_issue_rw_rq(struct mmc_queue_req *mq_rq)
> {
> + struct mmc_queue *mq = mq_rq->mq;
> struct mmc_card *card = mq->card;
>
> - if (!new_req) {
> + if (!mq_rq->req) {
> pr_err("%s: NULL request!\n", __func__);
> return;
> }
> @@ -1765,54 +1767,52 @@ static void mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *new_req)
> * multiple read or write is allowed
> */
> if (mmc_large_sector(card) &&
> - !IS_ALIGNED(blk_rq_sectors(new_req), 8)) {
> + !IS_ALIGNED(blk_rq_sectors(mq_rq->req), 8)) {
> pr_err("%s: Transfer size is not 4KB sector size aligned\n",
> - new_req->rq_disk->disk_name);
> - mmc_blk_rw_cmd_abort(card, new_req);
> + mq_rq->req->rq_disk->disk_name);
> + mmc_blk_rw_cmd_abort(card, mq_rq->req);
> return;
> }
>
> - mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
> - mmc_start_areq(card->host, &mq->mqrq_cur->areq);
> + mmc_blk_rw_rq_prep(mq_rq, card, 0, mq);
> + mmc_start_areq(card->host, &mq_rq->areq);
> }
>
> -void mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
> +void mmc_blk_issue_rq(struct mmc_queue_req *mq_rq)
> {
> int ret;
> - struct mmc_blk_data *md = mq->blkdata;
> + struct mmc_blk_data *md = mq_rq->mq->blkdata;
> struct mmc_card *card = md->queue.card;
>
> ret = mmc_blk_part_switch(card, md);
> if (ret) {
> - if (req) {

dropping of req checking should belong to some earlier patch

> - blk_end_request_all(req, -EIO);
> - }
> + blk_end_request_all(mq_rq->req, -EIO);
> return;
> }
>
> - if (req && req_op(req) == REQ_OP_DISCARD) {
> + if (req_op(mq_rq->req) == REQ_OP_DISCARD) {

ditto

> /* complete ongoing async transfer before issuing discard */
> if (card->host->areq) {
> wait_for_completion(&card->host->areq->complete);
> card->host->areq = NULL;
> }
> - mmc_blk_issue_discard_rq(mq, req);
> - } else if (req && req_op(req) == REQ_OP_SECURE_ERASE) {

ditto

> + mmc_blk_issue_discard_rq(mq_rq);
> + } else if (req_op(mq_rq->req) == REQ_OP_SECURE_ERASE) {
> /* complete ongoing async transfer before issuing secure erase*/
> if (card->host->areq) {
> wait_for_completion(&card->host->areq->complete);
> card->host->areq = NULL;
> }
> - mmc_blk_issue_secdiscard_rq(mq, req);
> - } else if (req && req_op(req) == REQ_OP_FLUSH) {
> + mmc_blk_issue_secdiscard_rq(mq_rq);
> + } else if (req_op(mq_rq->req) == REQ_OP_FLUSH) {

ditto

> /* complete ongoing async transfer before issuing flush */
> if (card->host->areq) {
> wait_for_completion(&card->host->areq->complete);
> card->host->areq = NULL;
> }
> - mmc_blk_issue_flush(mq, req);
> + mmc_blk_issue_flush(mq_rq);
> } else {
> - mmc_blk_issue_rw_rq(mq, req);
> + mmc_blk_issue_rw_rq(mq_rq);
> }
> }
>
> diff --git a/drivers/mmc/core/block.h b/drivers/mmc/core/block.h
> index b4b489911599..0326fa5d8217 100644
> --- a/drivers/mmc/core/block.h
> +++ b/drivers/mmc/core/block.h
> @@ -3,10 +3,9 @@
>
> struct mmc_async_req;
> enum mmc_blk_status;
> -struct mmc_queue;
> -struct request;
> +struct mmc_queue_req;
>
> void mmc_blk_rw_done(struct mmc_async_req *areq, enum mmc_blk_status status);
> -void mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req);
> +void mmc_blk_issue_rq(struct mmc_queue_req *mq_rq);
>
> #endif
> diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c
> index c9f28de7b0f4..c4e1ced55796 100644
> --- a/drivers/mmc/core/queue.c
> +++ b/drivers/mmc/core/queue.c
> @@ -54,6 +54,7 @@ static int mmc_queue_thread(void *d)
> struct mmc_queue *mq = d;
> struct request_queue *q = mq->queue;
> bool claimed_host = false;
> + struct mmc_queue_req *mq_rq;
>
> current->flags |= PF_MEMALLOC;
>
> @@ -65,7 +66,8 @@ static int mmc_queue_thread(void *d)
> set_current_state(TASK_INTERRUPTIBLE);
> req = blk_fetch_request(q);
> mq->asleep = false;
> - mq->mqrq_cur->req = req;
> + mq_rq = mq->mqrq_cur;
> + mq_rq->req = req;
> spin_unlock_irq(q->queue_lock);
>
> if (req) {
> @@ -74,7 +76,7 @@ static int mmc_queue_thread(void *d)
> if (!claimed_host)
> mmc_get_card(mq->card);
> set_current_state(TASK_RUNNING);
> - mmc_blk_issue_rq(mq, req);
> + mmc_blk_issue_rq(mq_rq);
> cond_resched();
> /*
> * Current request becomes previous request

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics