[PATCH V14 23/24] mmc: block: Remove code no longer needed after the switch to blk-mq

Adrian Hunter
2017-11-21T13:42:49Z

Remove code no longer needed after the switch to blk-mq.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
drivers/mmc/core/block.c | 706 +----------------------------------------------
drivers/mmc/core/block.h | 2 -
drivers/mmc/core/queue.c | 240 +---------------
drivers/mmc/core/queue.h | 15 -
4 files changed, 13 insertions(+), 950 deletions(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index af445e405488..02dbc25d097b 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -1010,239 +1010,6 @@ static int card_busy_detect(struct mmc_card *card, bool hw_busy_detect,
return err;
}

-static int card_busy_detect_err(struct mmc_card *card, bool hw_busy_detect,
- struct request *req, bool *gen_err)
-{
- u32 resp_errs = 0;
- int err;
-
- err = card_busy_detect(card, hw_busy_detect, req, &resp_errs);
- if (resp_errs & R1_ERROR) {
- pr_err("%s: %s: error sending status cmd, status %#x\n",
- req->rq_disk->disk_name, __func__, resp_errs);
- *gen_err = true;
- }
-
- return err;
-}
-
-static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
- struct request *req, bool *gen_err, u32 *stop_status)
-{
- struct mmc_host *host = card->host;
- struct mmc_command cmd = {};
- int err;
- bool use_r1b_resp = rq_data_dir(req) == WRITE;
-
- /*
- * Normally we use R1B responses for WRITE, but in cases where the host
- * has specified a max_busy_timeout we need to validate it. A failure
- * means we need to prevent the host from doing hw busy detection, which
- * is done by converting to a R1 response instead.
- */
- if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
- use_r1b_resp = false;
-
- cmd.opcode = MMC_STOP_TRANSMISSION;
- if (use_r1b_resp) {
- cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
- cmd.busy_timeout = timeout_ms;
- } else {
- cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
- }
-
- err = mmc_wait_for_cmd(host, &cmd, 5);
- if (err)
- return err;
-
- *stop_status = cmd.resp[0];
-
- /* No need to check card status in case of READ. */
- if (rq_data_dir(req) == READ)
- return 0;
-
- if (!mmc_host_is_spi(host) &&
- (*stop_status & R1_ERROR)) {
- pr_err("%s: %s: general error sending stop command, resp %#x\n",
- req->rq_disk->disk_name, __func__, *stop_status);
- *gen_err = true;
- }
-
- return card_busy_detect_err(card, use_r1b_resp, req, gen_err);
-}
-
-#define ERR_NOMEDIUM 3
-#define ERR_RETRY 2
-#define ERR_ABORT 1
-#define ERR_CONTINUE 0
-
-static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
- bool status_valid, u32 status)
-{
- switch (error) {
- case -EILSEQ:
- /* response crc error, retry the r/w cmd */
- pr_err("%s: %s sending %s command, card status %#x\n",
- req->rq_disk->disk_name, "response CRC error",
- name, status);
- return ERR_RETRY;
-
- case -ETIMEDOUT:
- pr_err("%s: %s sending %s command, card status %#x\n",
- req->rq_disk->disk_name, "timed out", name, status);
-
- /* If the status cmd initially failed, retry the r/w cmd */
- if (!status_valid) {
- pr_err("%s: status not valid, retrying timeout\n",
- req->rq_disk->disk_name);
- return ERR_RETRY;
- }
-
- /*
- * If it was a r/w cmd crc error, or illegal command
- * (eg, issued in wrong state) then retry - we should
- * have corrected the state problem above.
- */
- if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND)) {
- pr_err("%s: command error, retrying timeout\n",
- req->rq_disk->disk_name);
- return ERR_RETRY;
- }
-
- /* Otherwise abort the command */
- return ERR_ABORT;
-
- default:
- /* We don't understand the error code the driver gave us */
- pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
- req->rq_disk->disk_name, error, status);
- return ERR_ABORT;
- }
-}
-
-/*
- * Initial r/w and stop cmd error recovery.
- * We don't know whether the card received the r/w cmd or not, so try to
- * restore things back to a sane state. Essentially, we do this as follows:
- * - Obtain card status. If the first attempt to obtain card status fails,
- * the status word will reflect the failed status cmd, not the failed
- * r/w cmd. If we fail to obtain card status, it suggests we can no
- * longer communicate with the card.
- * - Check the card state. If the card received the cmd but there was a
- * transient problem with the response, it might still be in a data transfer
- * mode. Try to send it a stop command. If this fails, we can't recover.
- * - If the r/w cmd failed due to a response CRC error, it was probably
- * transient, so retry the cmd.
- * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
- * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
- * illegal cmd, retry.
- * Otherwise we don't understand what happened, so abort.
- */
-static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
- struct mmc_blk_request *brq, bool *ecc_err, bool *gen_err)
-{
- bool prev_cmd_status_valid = true;
- u32 status, stop_status = 0;
- int err, retry;
-
- if (mmc_card_removed(card))
- return ERR_NOMEDIUM;
-
- /*
- * Try to get card status which indicates both the card state
- * and why there was no response. If the first attempt fails,
- * we can't be sure the returned status is for the r/w command.
- */
- for (retry = 2; retry >= 0; retry--) {
- err = __mmc_send_status(card, &status, 0);
- if (!err)
- break;
-
- /* Re-tune if needed */
- mmc_retune_recheck(card->host);
-
- prev_cmd_status_valid = false;
- pr_err("%s: error %d sending status command, %sing\n",
- req->rq_disk->disk_name, err, retry ? "retry" : "abort");
- }
-
- /* We couldn't get a response from the card. Give up. */
- if (err) {
- /* Check if the card is removed */
- if (mmc_detect_card_removed(card->host))
- return ERR_NOMEDIUM;
- return ERR_ABORT;
- }
-
- /* Flag ECC errors */
- if ((status & R1_CARD_ECC_FAILED) ||
- (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
- (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
- *ecc_err = true;
-
- /* Flag General errors */
- if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
- if ((status & R1_ERROR) ||
- (brq->stop.resp[0] & R1_ERROR)) {
- pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
- req->rq_disk->disk_name, __func__,
- brq->stop.resp[0], status);
- *gen_err = true;
- }
-
- /*
- * Check the current card state. If it is in some data transfer
- * mode, tell it to stop (and hopefully transition back to TRAN.)
- */
- if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
- R1_CURRENT_STATE(status) == R1_STATE_RCV) {
- err = send_stop(card,
- DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
- req, gen_err, &stop_status);
- if (err) {
- pr_err("%s: error %d sending stop command\n",
- req->rq_disk->disk_name, err);
- /*
- * If the stop cmd also timed out, the card is probably
- * not present, so abort. Other errors are bad news too.
- */
- return ERR_ABORT;
- }
-
- if (stop_status & R1_CARD_ECC_FAILED)
- *ecc_err = true;
- }
-
- /* Check for set block count errors */
- if (brq->sbc.error)
- return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
- prev_cmd_status_valid, status);
-
- /* Check for r/w command errors */
- if (brq->cmd.error)
- return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
- prev_cmd_status_valid, status);
-
- /* Data errors */
- if (!brq->stop.error)
- return ERR_CONTINUE;
-
- /* Now for stop errors. These aren't fatal to the transfer. */
- pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
- req->rq_disk->disk_name, brq->stop.error,
- brq->cmd.resp[0], status);
-
- /*
- * Subsitute in our own stop status as this will give the error
- * state which happened during the execution of the r/w command.
- */
- if (stop_status) {
- brq->stop.resp[0] = stop_status;
- brq->stop.error = 0;
- }
- return ERR_CONTINUE;
-}
-
static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
int type)
{
@@ -1277,14 +1044,6 @@ static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
md->reset_done &= ~type;
}

-static void mmc_blk_end_request(struct request *req, blk_status_t error)
-{
- if (req->mq_ctx)
- blk_mq_end_request(req, error);
- else
- blk_end_request_all(req, error);
-}
-
/*
* The non-block commands come back from the block layer after it queued it and
* processed it with all other requests and then they get issued in this
@@ -1346,7 +1105,7 @@ static void mmc_blk_issue_drv_op(struct mmc_queue *mq, struct request *req)
break;
}
mq_rq->drv_op_result = ret;
- mmc_blk_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
+ blk_mq_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
}

static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
@@ -1389,7 +1148,7 @@ static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
else
mmc_blk_reset_success(md, type);
fail:
- mmc_blk_end_request(req, status);
+ blk_mq_end_request(req, status);
}

static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
@@ -1459,7 +1218,7 @@ static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
if (!err)
mmc_blk_reset_success(md, type);
out:
- mmc_blk_end_request(req, status);
+ blk_mq_end_request(req, status);
}

static void mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
@@ -1469,7 +1228,7 @@ static void mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
int ret = 0;

ret = mmc_flush_cache(card);
- mmc_blk_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
+ blk_mq_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
}

/*
@@ -1549,115 +1308,6 @@ static void mmc_blk_eval_resp_error(struct mmc_blk_request *brq)
}
}

-static enum mmc_blk_status mmc_blk_err_check(struct mmc_card *card,
- struct mmc_async_req *areq)
-{
- struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
- areq);
- struct mmc_blk_request *brq = &mq_mrq->brq;
- struct request *req = mmc_queue_req_to_req(mq_mrq);
- int need_retune = card->host->need_retune;
- bool ecc_err = false;
- bool gen_err = false;
-
- /*
- * sbc.error indicates a problem with the set block count
- * command. No data will have been transferred.
- *
- * cmd.error indicates a problem with the r/w command. No
- * data will have been transferred.
- *
- * stop.error indicates a problem with the stop command. Data
- * may have been transferred, or may still be transferring.
- */
-
- mmc_blk_eval_resp_error(brq);
-
- if (brq->sbc.error || brq->cmd.error ||
- brq->stop.error || brq->data.error) {
- switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
- case ERR_RETRY:
- return MMC_BLK_RETRY;
- case ERR_ABORT:
- return MMC_BLK_ABORT;
- case ERR_NOMEDIUM:
- return MMC_BLK_NOMEDIUM;
- case ERR_CONTINUE:
- break;
- }
- }
-
- /*
- * Check for errors relating to the execution of the
- * initial command - such as address errors. No data
- * has been transferred.
- */
- if (brq->cmd.resp[0] & CMD_ERRORS) {
- pr_err("%s: r/w command failed, status = %#x\n",
- req->rq_disk->disk_name, brq->cmd.resp[0]);
- return MMC_BLK_ABORT;
- }
-
- /*
- * Everything else is either success, or a data error of some
- * kind. If it was a write, we may have transitioned to
- * program mode, which we have to wait for it to complete.
- */
- if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
- int err;
-
- /* Check stop command response */
- if (brq->stop.resp[0] & R1_ERROR) {
- pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
- req->rq_disk->disk_name, __func__,
- brq->stop.resp[0]);
- gen_err = true;
- }
-
- err = card_busy_detect_err(card, false, req, &gen_err);
- if (err)
- return MMC_BLK_CMD_ERR;
- }
-
- /* if general error occurs, retry the write operation. */
- if (gen_err) {
- pr_warn("%s: retrying write for general error\n",
- req->rq_disk->disk_name);
- return MMC_BLK_RETRY;
- }
-
- /* Some errors (ECC) are flagged on the next commmand, so check stop, too */
- if (brq->data.error || brq->stop.error) {
- if (need_retune && !brq->retune_retry_done) {
- pr_debug("%s: retrying because a re-tune was needed\n",
- req->rq_disk->disk_name);
- brq->retune_retry_done = 1;
- return MMC_BLK_RETRY;
- }
- pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
- req->rq_disk->disk_name, brq->data.error ?: brq->stop.error,
- (unsigned)blk_rq_pos(req),
- (unsigned)blk_rq_sectors(req),
- brq->cmd.resp[0], brq->stop.resp[0]);
-
- if (rq_data_dir(req) == READ) {
- if (ecc_err)
- return MMC_BLK_ECC_ERR;
- return MMC_BLK_DATA_ERR;
- } else {
- return MMC_BLK_CMD_ERR;
- }
- }
-
- if (!brq->data.bytes_xfered)
- return MMC_BLK_RETRY;
-
- if (blk_rq_bytes(req) != brq->data.bytes_xfered)
- return MMC_BLK_PARTIAL;
-
- return MMC_BLK_SUCCESS;
-}
-
static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq,
int disable_multi, bool *do_rel_wr_p,
bool *do_data_tag_p)
@@ -1773,8 +1423,6 @@ static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq,
brq->data.sg_len = i;
}

- mqrq->areq.mrq = &brq->mrq;
-
if (do_rel_wr_p)
*do_rel_wr_p = do_rel_wr;

@@ -1978,8 +1626,6 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
brq->mrq.sbc = &brq->sbc;
}
-
- mqrq->areq.err_check = mmc_blk_err_check;
}

#define MMC_MAX_RETRIES 5
@@ -2561,350 +2207,6 @@ enum mmc_issued mmc_blk_mq_issue_rq(struct mmc_queue *mq, struct request *req)
}
}

-static bool mmc_blk_rw_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
- struct mmc_blk_request *brq, struct request *req,
- bool old_req_pending)
-{
- bool req_pending;
-
- /*
- * If this is an SD card and we're writing, we can first
- * mark the known good sectors as ok.
- *
- * If the card is not SD, we can still ok written sectors
- * as reported by the controller (which might be less than
- * the real number of written sectors, but never more).
- */
- if (mmc_card_sd(card)) {
- u32 blocks;
- int err;
-
- err = mmc_sd_num_wr_blocks(card, &blocks);
- if (err)
- req_pending = old_req_pending;
- else
- req_pending = blk_end_request(req, BLK_STS_OK, blocks << 9);
- } else {
- req_pending = blk_end_request(req, BLK_STS_OK, brq->data.bytes_xfered);
- }
- return req_pending;
-}
-
-static void mmc_blk_rw_cmd_abort(struct mmc_queue *mq, struct mmc_card *card,
- struct request *req,
- struct mmc_queue_req *mqrq)
-{
- if (mmc_card_removed(card))
- req->rq_flags |= RQF_QUIET;
- while (blk_end_request(req, BLK_STS_IOERR, blk_rq_cur_bytes(req)));
- mq->qcnt--;
-}
-
-/**
- * mmc_blk_rw_try_restart() - tries to restart the current async request
- * @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, struct request *req,
- struct mmc_queue_req *mqrq)
-{
- if (!req)
- return;
-
- /*
- * If the card was removed, just cancel everything and return.
- */
- if (mmc_card_removed(mq->card)) {
- req->rq_flags |= RQF_QUIET;
- blk_end_request_all(req, BLK_STS_IOERR);
- mq->qcnt--; /* FIXME: just set to 0? */
- return;
- }
- /* Else proceed and try to restart the current async request */
- mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq);
- mmc_start_areq(mq->card->host, &mqrq->areq, NULL);
-}
-
-static void mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *new_req)
-{
- struct mmc_blk_data *md = mq->blkdata;
- struct mmc_card *card = md->queue.card;
- struct mmc_blk_request *brq;
- int disable_multi = 0, retry = 0, type, retune_retry_done = 0;
- enum mmc_blk_status status;
- struct mmc_queue_req *mqrq_cur = NULL;
- struct mmc_queue_req *mq_rq;
- struct request *old_req;
- struct mmc_async_req *new_areq;
- struct mmc_async_req *old_areq;
- bool req_pending = true;
-
- if (new_req) {
- mqrq_cur = req_to_mmc_queue_req(new_req);
- mq->qcnt++;
- }
-
- if (!mq->qcnt)
- return;
-
- do {
- if (new_req) {
- /*
- * When 4KB native sector is enabled, only 8 blocks
- * multiple read or write is allowed
- */
- if (mmc_large_sector(card) &&
- !IS_ALIGNED(blk_rq_sectors(new_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(mq, card, new_req, mqrq_cur);
- return;
- }
-
- mmc_blk_rw_rq_prep(mqrq_cur, card, 0, mq);
- new_areq = &mqrq_cur->areq;
- } else
- new_areq = NULL;
-
- old_areq = mmc_start_areq(card->host, new_areq, &status);
- if (!old_areq) {
- /*
- * We have just put the first request into the pipeline
- * and there is nothing more to do until it is
- * complete.
- */
- return;
- }
-
- /*
- * An asynchronous request has been completed and we proceed
- * to handle the result of it.
- */
- mq_rq = container_of(old_areq, struct mmc_queue_req, areq);
- brq = &mq_rq->brq;
- old_req = mmc_queue_req_to_req(mq_rq);
- type = rq_data_dir(old_req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
-
- switch (status) {
- case MMC_BLK_SUCCESS:
- case MMC_BLK_PARTIAL:
- /*
- * Reset success, and accept bytes_xfered. For
- * MMC_BLK_PARTIAL re-submit the remaining request. For
- * MMC_BLK_SUCCESS error out the remaining request (it
- * could not be re-submitted anyway if a next request
- * had already begun).
- */
- mmc_blk_reset_success(md, type);
-
- req_pending = blk_end_request(old_req, BLK_STS_OK,
- brq->data.bytes_xfered);
- /*
- * If the blk_end_request function returns non-zero even
- * though all data has been transferred and no errors
- * were returned by the host controller, it's a bug.
- */
- if (status == MMC_BLK_SUCCESS && req_pending) {
- pr_err("%s BUG rq_tot %d d_xfer %d\n",
- __func__, blk_rq_bytes(old_req),
- brq->data.bytes_xfered);
- mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
- return;
- }
- break;
- case MMC_BLK_CMD_ERR:
- /*
- * For SD cards, get bytes written, but do not accept
- * bytes_xfered if that fails. For MMC cards accept
- * bytes_xfered. Then try to reset. If reset fails then
- * error out the remaining request, otherwise retry
- * once (N.B mmc_blk_reset() will not succeed twice in a
- * row).
- */
- req_pending = mmc_blk_rw_cmd_err(md, card, brq, old_req, req_pending);
- if (mmc_blk_reset(md, card->host, type)) {
- if (req_pending)
- mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
- else
- mq->qcnt--;
- mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
- return;
- }
- if (!req_pending) {
- mq->qcnt--;
- mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
- return;
- }
- break;
- case MMC_BLK_RETRY:
- /*
- * Do not accept bytes_xfered, but retry up to 5 times,
- * otherwise same as abort.
- */
- retune_retry_done = brq->retune_retry_done;
- if (retry++ < 5)
- break;
- /* Fall through */
- case MMC_BLK_ABORT:
- /*
- * Do not accept bytes_xfered, but try to reset. If
- * reset succeeds, try once more, otherwise error out
- * the request.
- */
- if (!mmc_blk_reset(md, card->host, type))
- break;
- mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
- mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
- return;
- case MMC_BLK_DATA_ERR: {
- int err;
-
- /*
- * Do not accept bytes_xfered, but try to reset. If
- * reset succeeds, try once more. If reset fails with
- * ENODEV which means the partition is wrong, then error
- * out the request. Otherwise attempt to read one sector
- * at a time.
- */
- err = mmc_blk_reset(md, card->host, type);
- if (!err)
- break;
- if (err == -ENODEV) {
- mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
- mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
- return;
- }
- /* Fall through */
- }
- case MMC_BLK_ECC_ERR:
- /*
- * Do not accept bytes_xfered. If reading more than one
- * sector, try reading one sector at a time.
- */
- if (brq->data.blocks > 1) {
- /* Redo read one sector at a time */
- pr_warn("%s: retrying using single block read\n",
- old_req->rq_disk->disk_name);
- disable_multi = 1;
- break;
- }
- /*
- * After an error, we redo I/O one sector at a
- * time, so we only reach here after trying to
- * read a single sector.
- */
- req_pending = blk_end_request(old_req, BLK_STS_IOERR,
- brq->data.blksz);
- if (!req_pending) {
- mq->qcnt--;
- mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
- return;
- }
- break;
- case MMC_BLK_NOMEDIUM:
- /* Do not accept bytes_xfered. Error out the request */
- mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
- mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
- return;
- default:
- /* Do not accept bytes_xfered. Error out the request */
- pr_err("%s: Unhandled return value (%d)",
- old_req->rq_disk->disk_name, status);
- mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
- mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
- return;
- }
-
- if (req_pending) {
- /*
- * In case of a incomplete request
- * prepare it again and resend.
- */
- mmc_blk_rw_rq_prep(mq_rq, card,
- disable_multi, mq);
- mmc_start_areq(card->host,
- &mq_rq->areq, NULL);
- mq_rq->brq.retune_retry_done = retune_retry_done;
- }
- } while (req_pending);
-
- mq->qcnt--;
-}
-
-void mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
-{
- int ret;
- struct mmc_blk_data *md = mq->blkdata;
- struct mmc_card *card = md->queue.card;
-
- if (req && !mq->qcnt)
- /* claim host only for the first request */
- mmc_get_card(card, NULL);
-
- ret = mmc_blk_part_switch(card, md->part_type);
- if (ret) {
- if (req) {
- blk_end_request_all(req, BLK_STS_IOERR);
- }
- goto out;
- }
-
- if (req) {
- switch (req_op(req)) {
- case REQ_OP_DRV_IN:
- case REQ_OP_DRV_OUT:
- /*
- * Complete ongoing async transfer before issuing
- * ioctl()s
- */
- if (mq->qcnt)
- mmc_blk_issue_rw_rq(mq, NULL);
- mmc_blk_issue_drv_op(mq, req);
- break;
- case REQ_OP_DISCARD:
- /*
- * Complete ongoing async transfer before issuing
- * discard.
- */
- if (mq->qcnt)
- mmc_blk_issue_rw_rq(mq, NULL);
- mmc_blk_issue_discard_rq(mq, req);
- break;
- case REQ_OP_SECURE_ERASE:
- /*
- * Complete ongoing async transfer before issuing
- * secure erase.
- */
- if (mq->qcnt)
- mmc_blk_issue_rw_rq(mq, NULL);
- mmc_blk_issue_secdiscard_rq(mq, req);
- break;
- case REQ_OP_FLUSH:
- /*
- * Complete ongoing async transfer before issuing
- * flush.
- */
- if (mq->qcnt)
- mmc_blk_issue_rw_rq(mq, NULL);
- mmc_blk_issue_flush(mq, req);
- break;
- default:
- /* Normal request, just issue it */
- mmc_blk_issue_rw_rq(mq, req);
- card->host->context_info.is_waiting_last_req = false;
- break;
- }
- } else {
- /* No request, flushing the pipeline with NULL */
- mmc_blk_issue_rw_rq(mq, NULL);
- card->host->context_info.is_waiting_last_req = false;
- }
-
-out:
- if (!mq->qcnt)
- mmc_put_card(card, NULL);
-}
-
static inline int mmc_blk_readonly(struct mmc_card *card)
{
return mmc_card_readonly(card) ||
diff --git a/drivers/mmc/core/block.h b/drivers/mmc/core/block.h
index b126418fd163..31153f656f41 100644
--- a/drivers/mmc/core/block.h
+++ b/drivers/mmc/core/block.h
@@ -5,8 +5,6 @@
struct mmc_queue;
struct request;

-void mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req);
-
void mmc_blk_cqe_recovery(struct mmc_queue *mq);

enum mmc_issued;
diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c
index 148a13d9adf0..aa591015412a 100644
--- a/drivers/mmc/core/queue.c
+++ b/drivers/mmc/core/queue.c
@@ -24,22 +24,6 @@
#include "card.h"
#include "host.h"

-/*
- * Prepare a MMC request. This just filters out odd stuff.
- */
-static int mmc_prep_request(struct request_queue *q, struct request *req)
-{
- struct mmc_queue *mq = q->queuedata;
-
- if (mq && mmc_card_removed(mq->card))
- return BLKPREP_KILL;
-
- req->rq_flags |= RQF_DONTPREP;
- req_to_mmc_queue_req(req)->retries = 0;
-
- return BLKPREP_OK;
-}
-
static inline bool mmc_cqe_dcmd_busy(struct mmc_queue *mq)
{
/* Allow only 1 DCMD at a time */
@@ -181,86 +165,6 @@ static void mmc_mq_recovery_handler(struct work_struct *work)
blk_mq_run_hw_queues(q, true);
}

-static int mmc_queue_thread(void *d)
-{
- struct mmc_queue *mq = d;
- struct request_queue *q = mq->queue;
- struct mmc_context_info *cntx = &mq->card->host->context_info;
-
- current->flags |= PF_MEMALLOC;
-
- down(&mq->thread_sem);
- do {
- struct request *req;
-
- spin_lock_irq(q->queue_lock);
- set_current_state(TASK_INTERRUPTIBLE);
- req = blk_fetch_request(q);
- mq->asleep = false;
- cntx->is_waiting_last_req = false;
- cntx->is_new_req = false;
- if (!req) {
- /*
- * Dispatch queue is empty so set flags for
- * mmc_request_fn() to wake us up.
- */
- if (mq->qcnt)
- cntx->is_waiting_last_req = true;
- else
- mq->asleep = true;
- }
- spin_unlock_irq(q->queue_lock);
-
- if (req || mq->qcnt) {
- set_current_state(TASK_RUNNING);
- mmc_blk_issue_rq(mq, req);
- cond_resched();
- } else {
- if (kthread_should_stop()) {
- set_current_state(TASK_RUNNING);
- break;
- }
- up(&mq->thread_sem);
- schedule();
- down(&mq->thread_sem);
- }
- } while (1);
- up(&mq->thread_sem);
-
- return 0;
-}
-
-/*
- * Generic MMC request handler. This is called for any queue on a
- * particular host. When the host is not busy, we look for a request
- * on any queue on this host, and attempt to issue it. This may
- * not be the queue we were asked to process.
- */
-static void mmc_request_fn(struct request_queue *q)
-{
- struct mmc_queue *mq = q->queuedata;
- struct request *req;
- struct mmc_context_info *cntx;
-
- if (!mq) {
- while ((req = blk_fetch_request(q)) != NULL) {
- req->rq_flags |= RQF_QUIET;
- __blk_end_request_all(req, BLK_STS_IOERR);
- }
- return;
- }
-
- cntx = &mq->card->host->context_info;
-
- if (cntx->is_waiting_last_req) {
- cntx->is_new_req = true;
- wake_up_interruptible(&cntx->wait);
- }
-
- if (mq->asleep)
- wake_up_process(mq->thread);
-}
-
static struct scatterlist *mmc_alloc_sg(int sg_len, gfp_t gfp)
{
struct scatterlist *sg;
@@ -311,12 +215,6 @@ static int __mmc_init_request(struct mmc_queue *mq, struct request *req,
return 0;
}

-static int mmc_init_request(struct request_queue *q, struct request *req,
- gfp_t gfp)
-{
- return __mmc_init_request(q->queuedata, req, gfp);
-}
-
static void mmc_exit_request(struct request_queue *q, struct request *req)
{
struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
@@ -465,9 +363,6 @@ static void mmc_setup_queue(struct mmc_queue *mq, struct mmc_card *card)
blk_queue_max_segments(mq->queue, host->max_segs);
blk_queue_max_segment_size(mq->queue, host->max_seg_size);

- /* Initialize thread_sem even if it is not used */
- sema_init(&mq->thread_sem, 1);
-
INIT_WORK(&mq->recovery_work, mmc_mq_recovery_handler);
INIT_WORK(&mq->complete_work, mmc_blk_mq_complete_work);

@@ -550,51 +445,15 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
spinlock_t *lock, const char *subname)
{
struct mmc_host *host = card->host;
- int ret = -ENOMEM;

mq->card = card;

mq->use_cqe = host->cqe_enabled;

- if (mq->use_cqe || mmc_host_use_blk_mq(host))
- return mmc_mq_init(mq, card, lock);
-
- mq->queue = blk_alloc_queue(GFP_KERNEL);
- if (!mq->queue)
- return -ENOMEM;
- mq->queue->queue_lock = lock;
- mq->queue->request_fn = mmc_request_fn;
- mq->queue->init_rq_fn = mmc_init_request;
- mq->queue->exit_rq_fn = mmc_exit_request;
- mq->queue->cmd_size = sizeof(struct mmc_queue_req);
- mq->queue->queuedata = mq;
- mq->qcnt = 0;
- ret = blk_init_allocated_queue(mq->queue);
- if (ret) {
- blk_cleanup_queue(mq->queue);
- return ret;
- }
-
- blk_queue_prep_rq(mq->queue, mmc_prep_request);
-
- mmc_setup_queue(mq, card);
-
- mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd/%d%s",
- host->index, subname ? subname : "");
-
- if (IS_ERR(mq->thread)) {
- ret = PTR_ERR(mq->thread);
- goto cleanup_queue;
- }
-
- return 0;
-
-cleanup_queue:
- blk_cleanup_queue(mq->queue);
- return ret;
+ return mmc_mq_init(mq, card, lock);
}

-static void mmc_mq_queue_suspend(struct mmc_queue *mq)
+void mmc_queue_suspend(struct mmc_queue *mq)
{
blk_mq_quiesce_queue(mq->queue);

@@ -606,71 +465,22 @@ static void mmc_mq_queue_suspend(struct mmc_queue *mq)
mmc_release_host(mq->card->host);
}

-static void mmc_mq_queue_resume(struct mmc_queue *mq)
+void mmc_queue_resume(struct mmc_queue *mq)
{
blk_mq_unquiesce_queue(mq->queue);
}

-static void __mmc_queue_suspend(struct mmc_queue *mq)
-{
- struct request_queue *q = mq->queue;
- unsigned long flags;
-
- if (!mq->suspended) {
- mq->suspended |= true;
-
- spin_lock_irqsave(q->queue_lock, flags);
- blk_stop_queue(q);
- spin_unlock_irqrestore(q->queue_lock, flags);
-
- down(&mq->thread_sem);
- }
-}
-
-static void __mmc_queue_resume(struct mmc_queue *mq)
-{
- struct request_queue *q = mq->queue;
- unsigned long flags;
-
- if (mq->suspended) {
- mq->suspended = false;
-
- up(&mq->thread_sem);
-
- spin_lock_irqsave(q->queue_lock, flags);
- blk_start_queue(q);
- spin_unlock_irqrestore(q->queue_lock, flags);
- }
-}
-
void mmc_cleanup_queue(struct mmc_queue *mq)
{
struct request_queue *q = mq->queue;
- unsigned long flags;

- if (q->mq_ops) {
- /*
- * The legacy code handled the possibility of being suspended,
- * so do that here too.
- */
- if (blk_queue_quiesced(q))
- blk_mq_unquiesce_queue(q);
- goto out_cleanup;
- }
-
- /* Make sure the queue isn't suspended, as that will deadlock */
- mmc_queue_resume(mq);
-
- /* Then terminate our worker thread */
- kthread_stop(mq->thread);
-
- /* Empty the queue */
- spin_lock_irqsave(q->queue_lock, flags);
- q->queuedata = NULL;
- blk_start_queue(q);
- spin_unlock_irqrestore(q->queue_lock, flags);
+ /*
+ * The legacy code handled the possibility of being suspended,
+ * so do that here too.
+ */
+ if (blk_queue_quiesced(q))
+ blk_mq_unquiesce_queue(q);

-out_cleanup:
blk_cleanup_queue(q);

/*
@@ -683,38 +493,6 @@ void mmc_cleanup_queue(struct mmc_queue *mq)
mq->card = NULL;
}

-/**
- * mmc_queue_suspend - suspend a MMC request queue
- * @mq: MMC queue to suspend
- *
- * Stop the block request queue, and wait for our thread to
- * complete any outstanding requests. This ensures that we
- * won't suspend while a request is being processed.
- */
-void mmc_queue_suspend(struct mmc_queue *mq)
-{
- struct request_queue *q = mq->queue;
-
- if (q->mq_ops)
- mmc_mq_queue_suspend(mq);
- else
- __mmc_queue_suspend(mq);
-}
-
-/**
- * mmc_queue_resume - resume a previously suspended MMC request queue
- * @mq: MMC queue to resume
- */
-void mmc_queue_resume(struct mmc_queue *mq)
-{
- struct request_queue *q = mq->queue;
-
- if (q->mq_ops)
- mmc_mq_queue_resume(mq);
- else
- __mmc_queue_resume(mq);
-}
-
/*
* Prepare the sg list(s) to be handed of to the host driver
*/
diff --git a/drivers/mmc/core/queue.h b/drivers/mmc/core/queue.h
index c4271fa54f1a..9214b1cdc8ab 100644
--- a/drivers/mmc/core/queue.h
+++ b/drivers/mmc/core/queue.h
@@ -34,7 +34,6 @@ static inline struct request *mmc_queue_req_to_req(struct mmc_queue_req *mqr)
return blk_mq_rq_from_pdu(mqr);
}

-struct task_struct;
struct mmc_blk_data;
struct mmc_blk_ioc_data;

@@ -44,7 +43,6 @@ struct mmc_blk_request {
struct mmc_command cmd;
struct mmc_command stop;
struct mmc_data data;
- int retune_retry_done;
};

/**
@@ -66,7 +64,6 @@ enum mmc_drv_op {
struct mmc_queue_req {
struct mmc_blk_request brq;
struct scatterlist *sg;
- struct mmc_async_req areq;
enum mmc_drv_op drv_op;
int drv_op_result;
void *drv_op_data;
@@ -76,22 +73,10 @@ struct mmc_queue_req {

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;
struct request_queue *queue;
- /*
- * FIXME: this counter is not a very reliable way of keeping
- * track of how many requests that are ongoing. Switch to just
- * letting the block core keep track of requests and per-request
- * associated mmc_queue_req data.
- */
- int qcnt;
-
int in_flight[MMC_ISSUE_MAX];
unsigned int cqe_busy;
#define MMC_CQE_DCMD_BUSY BIT(0)
--
1.9.1