On 27 January 2012 12:25, Seungwon Jeon <tgih.jun@xxxxxxxxxxx> wrote:
> Saugata Das <saugata.das@xxxxxxxxxx> wrote:
>> On 25 January 2012 10:47, Seungwon Jeon <tgih.jun@xxxxxxxxxxx> wrote:
>> > Hi, Saugata Das.
>> >
>> > Saugata Das <saugata.das@xxxxxxxxxx> wrote:
>> >> On 20 January 2012 09:36, Seungwon Jeon <tgih.jun@xxxxxxxxxxx> wrote:
>> >> > This patch supports packed command of eMMC4.5 device.
>> >> > Several reads(or writes) can be grouped in packed command
>> >> > and all data of the individual commands can be sent in a
>> >> > single transfer on the bus.
>> >> >
>> >> > Signed-off-by: Seungwon Jeon <tgih.jun@xxxxxxxxxxx>
>> >> > ---
>> >> > drivers/mmc/card/block.c | 469 +++++++++++++++++++++++++++++++++++++++++---
>> >> > drivers/mmc/card/queue.c | 48 +++++-
>> >> > drivers/mmc/card/queue.h | 13 ++
>> >> > drivers/mmc/core/host.c | 2 +
>> >> > drivers/mmc/core/mmc_ops.c | 1 +
>> >> > include/linux/mmc/core.h | 3 +
>> >> > include/linux/mmc/host.h | 3 +
>> >> > 7 files changed, 512 insertions(+), 27 deletions(-)
>> >> >
>> >> > diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
>> >> > index 176b78e..77d457e 100644
>> >> > --- a/drivers/mmc/card/block.c
>> >> > +++ b/drivers/mmc/card/block.c
>> >> > @@ -59,6 +59,13 @@ MODULE_ALIAS("mmc:block");
>> >> > #define INAND_CMD38_ARG_SECTRIM1 0x81
>> >> > #define INAND_CMD38_ARG_SECTRIM2 0x88
>> >> >
>> >> > +#define mmc_req_rel_wr(req) (((req->cmd_flags & REQ_FUA) || \
>> >> > + (req->cmd_flags & REQ_META)) && \
>> >> > + (rq_data_dir(req) == WRITE))
>> >> > +#define PACKED_CMD_VER 0x01
>> >> > +#define PACKED_CMD_RD 0x01
>> >> > +#define PACKED_CMD_WR 0x02
>> >> > +
>> >> > static DEFINE_MUTEX(block_mutex);
>> >> >
>> >> > /*
>> >> > @@ -99,6 +106,7 @@ struct mmc_blk_data {
>> >> > #define MMC_BLK_WRITE BIT(1)
>> >> > #define MMC_BLK_DISCARD BIT(2)
>> >> > #define MMC_BLK_SECDISCARD BIT(3)
>> >> > +#define MMC_BLK_WR_HDR BIT(4)
>> >> >
>> >> > /*
>> >> > * Only set in main mmc_blk_data associated
>> >> > @@ -1028,7 +1036,8 @@ static int mmc_blk_err_check(struct mmc_card *card,
>> >> > * 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) {
>> >> > + if ((!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) ||
>> >> > + (mq_mrq->packed_cmd == MMC_PACKED_WR_HDR)) {
>> >> > u32 status;
>> >> > do {
>> >> > int err = get_card_status(card, &status, 5);
>> >> > @@ -1053,7 +1062,8 @@ static int mmc_blk_err_check(struct mmc_card *card,
>> >> > (unsigned)blk_rq_sectors(req),
>> >> > brq->cmd.resp[0], brq->stop.resp[0]);
>> >> >
>> >> > - if (rq_data_dir(req) == READ) {
>> >> > + if (rq_data_dir(req) == READ &&
>> >> > + mq_mrq->packed_cmd != MMC_PACKED_WR_HDR) {
>> >> > if (ecc_err)
>> >> > return MMC_BLK_ECC_ERR;
>> >> > return MMC_BLK_DATA_ERR;
>> >> > @@ -1065,12 +1075,60 @@ static int mmc_blk_err_check(struct mmc_card *card,
>> >> > if (!brq->data.bytes_xfered)
>> >> > return MMC_BLK_RETRY;
>> >> >
>> >> > + if (mq_mrq->packed_cmd != MMC_PACKED_NONE) {
>> >> > + if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
>> >> > + return MMC_BLK_PARTIAL;
>> >> > + else
>> >> > + return MMC_BLK_SUCCESS;
>> >> > + }
>> >> > +
>> >> > if (blk_rq_bytes(req) != brq->data.bytes_xfered)
>> >> > return MMC_BLK_PARTIAL;
>> >> >
>> >> > return MMC_BLK_SUCCESS;
>> >> > }
>> >> >
>> >> > +static int mmc_blk_packed_err_check(struct mmc_card *card,
>> >> > + struct mmc_async_req *areq)
>> >> > +{
>> >> > + struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
>> >> > + mmc_active);
>> >> > + struct request *req = mq_rq->req;
>> >> > + int err, check, status;
>> >> > + u8 ext_csd[512];
>> >> > +
>> >> > + check = mmc_blk_err_check(card, areq);
>> >> > + err = get_card_status(card, &status, 0);
>> >> > + if (err) {
>> >> > + pr_err("%s: error %d sending status command\n",
>> >> > + req->rq_disk->disk_name, err);
>> >> > + return MMC_BLK_ABORT;
>> >> > + }
>> >> > +
>> >> > + if (status & R1_EXP_EVENT) {
>> >> > + err = mmc_send_ext_csd(card, ext_csd);
>> >> > + if (err) {
>> >> > + pr_err("%s: error %d sending ext_csd\n",
>> >> > + req->rq_disk->disk_name, err);
>> >> > + return MMC_BLK_ABORT;
>> >> > + }
>> >> > +
>> >> > + if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
>> >> > + EXT_CSD_PACKED_FAILURE) &&
>> >> > + (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
>> >> > + EXT_CSD_PACKED_GENERIC_ERROR)) {
>> >> > + if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
>> >> > + EXT_CSD_PACKED_INDEXED_ERROR) {
>> >> > + mq_rq->packed_fail_idx =
>> >> > + ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
>> >> > + return MMC_BLK_PARTIAL;
>> >> > + }
>> >> > + }
>> >> > + }
>> >> > +
>> >> > + return check;
>> >> > +}
>> >> > +
>> >> > static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
>> >> > struct mmc_card *card,
>> >> > int disable_multi,
>> >> > @@ -1225,10 +1283,238 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
>> >> > mmc_queue_bounce_pre(mqrq);
>> >> > }
>> >> >
>> >> > +static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
>> >> > +{
>> >> > + struct request_queue *q = mq->queue;
>> >> > + struct mmc_card *card = mq->card;
>> >> > + struct request *cur = req, *next = NULL;
>> >> > + struct mmc_blk_data *md = mq->data;
>> >> > + bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
>> >> > + unsigned int req_sectors = 0, phys_segments = 0;
>> >> > + unsigned int max_blk_count, max_phys_segs;
>> >> > + u8 put_back = 0;
>> >> > + u8 max_packed_rw = 0;
>> >> > + u8 reqs = 0;
>> >> > +
>> >> > + mq->mqrq_cur->packed_num = 0;
>> >> > +
>> >> > + if (!(md->flags & MMC_BLK_CMD23) ||
>> >> > + !card->ext_csd.packed_event_en)
>> >> > + goto no_packed;
>> >> > +
>> >> > + if (rq_data_dir(cur) == READ)
>> >> > + max_packed_rw = card->ext_csd.max_packed_reads;
>> >> > + else
>> >> > + max_packed_rw = card->ext_csd.max_packed_writes;
>> >> > +
>> >> > + if (max_packed_rw == 0)
>> >> > + goto no_packed;
>> >> > +
>> >> > + if (mmc_req_rel_wr(cur) &&
>> >> > + (md->flags & MMC_BLK_REL_WR) &&
>> >> > + !en_rel_wr) {
>> >> > + goto no_packed;
>> >> > + }
>> >>
>> >> Is there any reason of not allowing reliable write on packed command ?
>> >> I think, it may get benefit from the packed command since reliable
>> >> writes are typically very small transfer (e.g. meta-data).
>> > In the case where reliable write is requested but enhanced reliable write
>> > is not supported, write access must be partial according to
>> > reliable write sector count. Because even a single request can be split,
>> > packed command is not allowed in this case.
>>
>> Then, can you include the enhanced reliable writes in the packed command ?
> Yes, enhanced reliable writes will be packed.
>
Thanks. I missed the "!en_rel_wr" in the condition.
>>
>> >
>> >> > +
>> >> > + max_blk_count = min(card->host->max_blk_count,
>> >> > + card->host->max_req_size >> 9);
>> >> > + if (unlikely(max_blk_count > 0xffff))
>> >> > + max_blk_count = 0xffff;
>> >> > +
>> >> > + max_phys_segs = queue_max_segments(q);
>> >> > + req_sectors += blk_rq_sectors(cur);
>> >> > + phys_segments += req->nr_phys_segments;
>> >> > +
>> >> > + if (rq_data_dir(cur) == WRITE) {
>> >> > + req_sectors++;
>> >> > + phys_segments++;
>> >> > + }
>> >> > +
>> >> > + while (reqs < max_packed_rw - 1) {
>> >> > + spin_lock_irq(q->queue_lock);
>> >> > + next = blk_fetch_request(q);
>> >> > + spin_unlock_irq(q->queue_lock);
>> >> > + if (!next)
>> >> > + break;
>> >> > +
>> >> > + if (next->cmd_flags & REQ_DISCARD ||
>> >> > + next->cmd_flags & REQ_FLUSH) {
>> >> > + put_back = 1;
>> >> > + break;
>> >> > + }
>> >> > +
>> >> > + if (rq_data_dir(cur) != rq_data_dir(next)) {
>> >> > + put_back = 1;
>> >> > + break;
>> >> > + }
>> >> > +
>> >> > + if (mmc_req_rel_wr(next) &&
>> >> > + (md->flags & MMC_BLK_REL_WR) &&
>> >> > + !en_rel_wr) {
>> >> > + put_back = 1;
>> >> > + break;
>> >> > + }
>> >> > +
>> >> > + req_sectors += blk_rq_sectors(next);
>> >> > + if (req_sectors > max_blk_count) {
>> >> > + put_back = 1;
>> >> > + break;
>> >> > + }
>> >> > +
>> >> > + phys_segments += next->nr_phys_segments;
>> >> > + if (phys_segments > max_phys_segs) {
>> >> > + put_back = 1;
>> >> > + break;
>> >> > + }
>> >> > +
>> >> > + list_add_tail(&next->queuelist, &mq->mqrq_cur->packed_list);
>> >> > + cur = next;
>> >> > + reqs++;
>> >> > + }
>> >> > +
>> >> > + if (put_back) {
>> >> > + spin_lock_irq(q->queue_lock);
>> >> > + blk_requeue_request(q, next);
>> >> > + spin_unlock_irq(q->queue_lock);
>> >> > + }
>> >> > +
>> >> > + if (reqs > 0) {
>> >> > + list_add(&req->queuelist, &mq->mqrq_cur->packed_list);
>> >> > + mq->mqrq_cur->packed_num = ++reqs;
>> >> > + return reqs;
>> >> > + }
>> >> > +
>> >> > +no_packed:
>> >> > + mq->mqrq_cur->packed_cmd = MMC_PACKED_NONE;
>> >> > + mq->mqrq_cur->packed_num = 0;
>> >> > + return 0;
>> >> > +}
>> >> > +
>> >> > +static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
>> >> > + struct mmc_card *card,
>> >> > + struct mmc_queue *mq,
>> >> > + u8 reqs)
>> >> > +{
>> >> > + struct mmc_blk_request *brq = &mqrq->brq;
>> >> > + struct request *req = mqrq->req;
>> >> > + struct request *prq;
>> >> > + struct mmc_blk_data *md = mq->data;
>> >> > + bool do_rel_wr;
>> >> > + u32 *packed_cmd_hdr = mqrq->packed_cmd_hdr;
>> >> > + u8 i = 1;
>> >> > +
>> >> > + mqrq->packed_cmd = (rq_data_dir(req) == READ) ?
>> >> > + MMC_PACKED_WR_HDR : MMC_PACKED_WRITE;
>> >> > + mqrq->packed_blocks = 0;
>> >> > + mqrq->packed_fail_idx = -1;
>> >> > +
>> >> > + memset(packed_cmd_hdr, 0, sizeof(mqrq->packed_cmd_hdr));
>> >> > + packed_cmd_hdr[0] = (reqs << 16) |
>> >> > + (((rq_data_dir(req) == READ) ?
>> >> > + PACKED_CMD_RD : PACKED_CMD_WR) << 8) |
>> >> > + PACKED_CMD_VER;
>> >> > +
>> >> > + /*
>> >> > + * Argument for each entry of packed group
>> >> > + */
>> >> > + list_for_each_entry(prq, &mqrq->packed_list, queuelist) {
>> >> > + do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
>> >> > + /* Argument of CMD23*/
>> >> > + packed_cmd_hdr[(i * 2)] = (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
>> >> > + blk_rq_sectors(prq);
>> >>
>> >> The data tag flag is missed here. I think, we can have a common
>> >> function which sets the CMD23 flags in both
>> >> mmc_blk_packed_hdr_wrq_prep and mmc_blk_rw_rq_prep. This will be
>> >> useful when intergrating the next features (e.g. context id)
>> >>
>> > Oh, you added Data tag feature. I'll apply this next version.
>> > And Adding new function which is related to CMD23 would be good
>> > in different patch not these commit.
>> >
>> >> > + /* Argument of CMD18 or CMD25 */
>> >> > + packed_cmd_hdr[((i * 2)) + 1] = mmc_card_blockaddr(card) ?
>> >> > + blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
>> >> > + mqrq->packed_blocks += blk_rq_sectors(prq);
>> >> > + i++;
>> >> > + }
>> >> > +
>> >> > + memset(brq, 0, sizeof(struct mmc_blk_request));
>> >> > + brq->mrq.cmd = &brq->cmd;
>> >> > + brq->mrq.data = &brq->data;
>> >> > + brq->mrq.sbc = &brq->sbc;
>> >> > + brq->mrq.stop = &brq->stop;
>> >> > +
>> >> > + brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
>> >> > + brq->sbc.arg = MMC_CMD23_ARG_PACKED |
>> >> > + ((rq_data_dir(req) == READ) ? 1 : mqrq->packed_blocks + 1);
>> >> > + brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
>> >> > +
>> >> > + brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
>> >> > + brq->cmd.arg = blk_rq_pos(req);
>> >> > + if (!mmc_card_blockaddr(card))
>> >> > + brq->cmd.arg <<= 9;
>> >> > + brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
>> >> > +
>> >> > + brq->data.blksz = 512;
>> >> > + /*
>> >> > + * Write separately the packd command header only for packed read.
>> >> > + * In case of packed write, header is sent with blocks of data.
>> >> > + */
>> >> > + brq->data.blocks = (rq_data_dir(req) == READ) ?
>> >> > + 1 : mqrq->packed_blocks + 1;
>> >> > + brq->data.flags |= MMC_DATA_WRITE;
>> >> > +
>> >> > + brq->stop.opcode = MMC_STOP_TRANSMISSION;
>> >> > + brq->stop.arg = 0;
>> >> > + brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
>> >> > +
>> >>
>> >> We do not need MMC_STOP_TRANSMISSION when we use MMC_SET_BLOCK_COUNT
>> > If transfer is terminated with an error, stop command is required.
>> > MMC_STOP_TRANSMISSION is for this purpose.
>>
>> The mmc_blk_err_check achieves this objective in case of an error.
>> There is no need of this additional command cycle when there is no
>> error.
> If an error doesn't happen, stop command is not issued.
> Could you explain about additional command cycle more?
>
I understand your remark after checking the implementation of sdhci.c.
No problem of additional command cycle here.
> Thanks.
> Seungwon Jeon.
>>
>> >
>> >>
>> >> > + mmc_set_data_timeout(&brq->data, card);
>> >> > +
>> >> > + brq->data.sg = mqrq->sg;
>> >> > + brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
>> >> > +
>> >> > + mqrq->mmc_active.mrq = &brq->mrq;
>> >> > + mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
>> >> > +
>> >> > + mmc_queue_bounce_pre(mqrq);
>> >> > +}
>> >> > +
>> >> > +static void mmc_blk_packed_rrq_prep(struct mmc_queue_req *mqrq,
>> >> > + struct mmc_card *card,
>> >> > + struct mmc_queue *mq)
>> >> > +{
>> >> > + struct mmc_blk_request *brq = &mqrq->brq;
>> >> > + struct request *req = mqrq->req;
>> >> > +
>> >> > + mqrq->packed_cmd = MMC_PACKED_READ;
>> >> > +
>> >> > + memset(brq, 0, sizeof(struct mmc_blk_request));
>> >> > + brq->mrq.cmd = &brq->cmd;
>> >> > + brq->mrq.data = &brq->data;
>> >> > + brq->mrq.stop = &brq->stop;
>> >> > +
>> >> > + brq->cmd.opcode = MMC_READ_MULTIPLE_BLOCK;
>> >> > + brq->cmd.arg = blk_rq_pos(req);
>> >> > + if (!mmc_card_blockaddr(card))
>> >> > + brq->cmd.arg <<= 9;
>> >> > + brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
>> >> > + brq->data.blksz = 512;
>> >> > + brq->data.blocks = mqrq->packed_blocks;
>> >> > + brq->data.flags |= MMC_DATA_READ;
>> >> > +
>> >> > + brq->stop.opcode = MMC_STOP_TRANSMISSION;
>> >> > + brq->stop.arg = 0;
>> >> > + brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
>> >> > +
>> >> > + mmc_set_data_timeout(&brq->data, card);
>> >> > +
>> >> > + brq->data.sg = mqrq->sg;
>> >> > + brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
>> >> > +
>> >> > + mqrq->mmc_active.mrq = &brq->mrq;
>> >> > + mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
>> >> > +
>> >> > + mmc_queue_bounce_pre(mqrq);
>> >> > +}
>> >> > +
>> >> > static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
>> >> > struct mmc_blk_request *brq, struct request *req,
>> >> > int ret)
>> >> > {
>> >> > + struct mmc_queue_req *mq_rq;
>> >> > + mq_rq = container_of(brq, struct mmc_queue_req, brq);
>> >> > +
>> >> > /*
>> >> > * If this is an SD card and we're writing, we can first
>> >> > * mark the known good sectors as ok.
>> >> > @@ -1247,13 +1533,65 @@ static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
>> >> > spin_unlock_irq(&md->lock);
>> >> > }
>> >> > } else {
>> >> > - spin_lock_irq(&md->lock);
>> >> > - ret = __blk_end_request(req, 0, brq->data.bytes_xfered);
>> >> > - spin_unlock_irq(&md->lock);
>> >> > + if (mq_rq->packed_cmd == MMC_PACKED_NONE) {
>> >> > + spin_lock_irq(&md->lock);
>> >> > + ret = __blk_end_request(req, 0, brq->data.bytes_xfered);
>> >> > + spin_unlock_irq(&md->lock);
>> >> > + }
>> >> > }
>> >> > return ret;
>> >> > }
>> >> >
>> >> > +static int mmc_blk_chk_hdr_err(struct mmc_queue *mq, int status)
>> >> > +{
>> >> > + struct mmc_blk_data *md = mq->data;
>> >> > + struct mmc_card *card = md->queue.card;
>> >> > + int type = MMC_BLK_WR_HDR, err = 0;
>> >> > +
>> >> > + switch (status) {
>> >> > + case MMC_BLK_PARTIAL:
>> >> > + case MMC_BLK_RETRY:
>> >> > + err = 0;
>> >> > + break;
>> >> > + case MMC_BLK_CMD_ERR:
>> >> > + case MMC_BLK_ABORT:
>> >> > + case MMC_BLK_DATA_ERR:
>> >> > + case MMC_BLK_ECC_ERR:
>> >> > + err = mmc_blk_reset(md, card->host, type);
>> >> > + if (!err)
>> >> > + mmc_blk_reset_success(md, type);
>> >> > + break;
>> >> > + }
>> >> > +
>> >> > + return err;
>> >> > +}
>> >> > +
>> >> > +static int mmc_blk_issue_packed_rd(struct mmc_queue *mq,
>> >> > + struct mmc_queue_req *mq_rq)
>> >> > +{
>> >> > + struct mmc_blk_data *md = mq->data;
>> >> > + struct mmc_card *card = md->queue.card;
>> >> > + int status, ret = -EIO, retry = 2;
>> >> > +
>> >> > + do {
>> >> > + mmc_start_req(card->host, NULL, (int *) &status);
>> >> > + if (status) {
>> >> > + ret = mmc_blk_chk_hdr_err(mq, status);
>> >> > + if (ret)
>> >> > + break;
>> >> > + mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq, mq_rq->packed_num);
>> >> > + mmc_start_req(card->host, &mq_rq->mmc_active, NULL);
>> >> > + } else {
>> >> > + mmc_blk_packed_rrq_prep(mq_rq, card, mq);
>> >> > + mmc_start_req(card->host, &mq_rq->mmc_active, NULL);
>> >> > + ret = 0;
>> >> > + break;
>> >> > + }
>> >> > + } while (retry-- > 0);
>> >> > +
>> >> > + return ret;
>> >> > +}
>> >> > +
>> >> > static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
>> >> > {
>> >> > struct mmc_blk_data *md = mq->data;
>> >> > @@ -1262,21 +1600,32 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
>> >> > int ret = 1, disable_multi = 0, retry = 0, type;
>> >> > enum mmc_blk_status status;
>> >> > struct mmc_queue_req *mq_rq;
>> >> > - struct request *req;
>> >> > + struct request *req, *prq;
>> >> > struct mmc_async_req *areq;
>> >> > + u8 reqs = 0;
>> >> >
>> >> > if (!rqc && !mq->mqrq_prev->req)
>> >> > return 0;
>> >> >
>> >> > + if (rqc)
>> >> > + reqs = mmc_blk_prep_packed_list(mq, rqc);
>> >> > +
>> >> > do {
>> >> > if (rqc) {
>> >> > - mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
>> >> > + if (reqs >= card->host->packed_min)
>> >> > + mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur, card, mq, reqs);
>> >> > + else
>> >> > + mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
>> >> > areq = &mq->mqrq_cur->mmc_active;
>> >> > } else
>> >> > areq = NULL;
>> >> > areq = mmc_start_req(card->host, areq, (int *) &status);
>> >> > - if (!areq)
>> >> > - return 0;
>> >> > + if (!areq) {
>> >> > + if (mq->mqrq_cur->packed_cmd == MMC_PACKED_WR_HDR)
>> >> > + goto snd_packed_rd;
>> >>
>> >> How the condition, when (areq is not NULL) and
>> >> (mq->mqrq_cur->packed_cmd = MMC_PACKED_WR_HDR) handled ?
>> > That case(areq == NULL && mq->mqrq_cur->packed_cmd == MMC_PACKED_WR_HDR)
>> > will be handled with escape from do~while.
>> > snd_packed_rd:
>> > if (mq->mqrq_cur->packed_cmd == MMC_PACKED_WR_HDR) {
>> > if (mmc_blk_issue_packed_rd(mq, mq->mqrq_cur))
>> > goto start_new_req;
>> > }
>> >
>> >>
>> >> > + else
>> >> > + return 0;
>> >> > + }
>> >> >
>> >> > mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
>> >> > brq = &mq_rq->brq;
>> >> > @@ -1291,10 +1640,38 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
>> >> > * A block was successfully transferred.
>> >> > */
>> >> > mmc_blk_reset_success(md, type);
>> >> > - spin_lock_irq(&md->lock);
>> >> > - ret = __blk_end_request(req, 0,
>> >> > +
>> >> > + if (mq_rq->packed_cmd != MMC_PACKED_NONE) {
>> >> > + int idx = mq_rq->packed_fail_idx, i = 0;
>> >> > + while (!list_empty(&mq_rq->packed_list)) {
>> >> > + prq = list_entry_rq(mq_rq->packed_list.next);
>> >> > + list_del_init(&prq->queuelist);
>> >> > + if (idx == i) {
>> >>
>> >> I think, in case of no error (packed_fail_idx=0) and when (i=0), this
>> >> above "if" condition will satisfy and subsequently wrongly retry.
>> > packed_failed_idx is '-1' not '0' with no error.
>> >
>> >>
>> >> > + /* retry from error index */
>> >> > + mq_rq->packed_num -= idx;
>> >> > + if (mq_rq->packed_num == 1) {
>> >> > + mq_rq->packed_cmd = MMC_PACKED_NONE;
>> >> > + mq_rq->packed_num = 0;
>> >> > + }
>> >> > + mq_rq->req = prq;
>> >> > + ret = 1;
>> >> > + break;
>> >> > + }
>> >> > + spin_lock_irq(&md->lock);
>> >> > + ret = __blk_end_request(prq, 0, blk_rq_bytes(prq));
>> >> > + spin_unlock_irq(&md->lock);
>> >> > + i++;
>> >> > + }
>> >> > + if (idx == -1)
>> >> > + mq_rq->packed_num = 0;
>> >> > + break;
>> >> > + } else {
>> >> > + spin_lock_irq(&md->lock);
>> >> > + ret = __blk_end_request(req, 0,
>> >> > brq->data.bytes_xfered);
>> >> > - spin_unlock_irq(&md->lock);
>> >> > + spin_unlock_irq(&md->lock);
>> >> > + }
>> >> > +
>> >> > /*
>> >> > * If the blk_end_request function returns non-zero even
>> >> > * though all data has been transferred and no errors
>> >> > @@ -1329,6 +1706,8 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
>> >> > break;
>> >> > if (err == -ENODEV)
>> >> > goto cmd_abort;
>> >> > + if (mq_rq->packed_cmd != MMC_PACKED_NONE)
>> >> > + break;
>> >> > /* Fall through */
>> >> > }
>> >> > case MMC_BLK_ECC_ERR:
>> >> > @@ -1356,27 +1735,69 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
>> >> > }
>> >> >
>> >> > if (ret) {
>> >> > - /*
>> >> > - * In case of a incomplete request
>> >> > - * prepare it again and resend.
>> >> > - */
>> >> > - mmc_blk_rw_rq_prep(mq_rq, card, disable_multi, mq);
>> >> > - mmc_start_req(card->host, &mq_rq->mmc_active, NULL);
>> >> > + if (mq_rq->packed_cmd == MMC_PACKED_NONE) {
>> >> > + /*
>> >> > + * In case of a incomplete request
>> >> > + * prepare it again and resend.
>> >> > + */
>> >> > + mmc_blk_rw_rq_prep(mq_rq, card, disable_multi, mq);
>> >> > + mmc_start_req(card->host, &mq_rq->mmc_active, NULL);
>> >> > + } else {
>> >> > + mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq, mq_rq->packed_num);
>> >> > + mmc_start_req(card->host, &mq_rq->mmc_active, NULL);
>> >> > + if (mq_rq->packed_cmd == MMC_PACKED_WR_HDR) {
>> >> > + if (mmc_blk_issue_packed_rd(mq, mq_rq))
>> >> > + goto cmd_abort;
>> >> > + }
>> >> > + }
>> >> > }
>> >> > } while (ret);
>> >> >
>> >> > +snd_packed_rd:
>> >> > + if (mq->mqrq_cur->packed_cmd == MMC_PACKED_WR_HDR) {
>> >> > + if (mmc_blk_issue_packed_rd(mq, mq->mqrq_cur))
>> >> > + goto start_new_req;
>> >> > + }
>> >> > return 1;
>> >> >
>> >> > cmd_abort:
>> >> > - spin_lock_irq(&md->lock);
>> >> > - if (mmc_card_removed(card))
>> >> > - req->cmd_flags |= REQ_QUIET;
>> >> > - while (ret)
>> >> > - ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
>> >> > - spin_unlock_irq(&md->lock);
>> >> > + if (mq_rq->packed_cmd == MMC_PACKED_NONE) {
>> >> > + spin_lock_irq(&md->lock);
>> >> > + if (mmc_card_removed(card))
>> >> > + req->cmd_flags |= REQ_QUIET;
>> >> > + while (ret)
>> >> > + ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
>> >> > + spin_unlock_irq(&md->lock);
>> >> > + } else {
>> >> > + while (!list_empty(&mq_rq->packed_list)) {
>> >> > + prq = list_entry_rq(mq_rq->packed_list.next);
>> >> > + list_del_init(&prq->queuelist);
>> >> > + spin_lock_irq(&md->lock);
>> >> > + __blk_end_request(prq, -EIO, blk_rq_bytes(prq));
>> >> > + spin_unlock_irq(&md->lock);
>> >> > + }
>> >> > + }
>> >> >
>> >> > start_new_req:
>> >> > if (rqc) {
>> >> > + /*
>> >> > + * If current request is packed, it need to put back.
>> >> > + */
>> >> > + if (mq->mqrq_cur->packed_cmd != MMC_PACKED_NONE) {
>> >> > + while (!list_empty(&mq->mqrq_cur->packed_list)) {
>> >> > + prq = list_entry_rq(mq->mqrq_cur->packed_list.prev);
>> >> > + if (prq->queuelist.prev != &mq->mqrq_cur->packed_list) {
>> >> > + list_del_init(&prq->queuelist);
>> >> > + spin_lock_irq(mq->queue->queue_lock);
>> >> > + blk_requeue_request(mq->queue, prq);
>> >> > + spin_unlock_irq(mq->queue->queue_lock);
>> >> > + } else {
>> >> > + list_del_init(&prq->queuelist);
>> >> > + }
>> >> > + }
>> >> > + mq->mqrq_cur->packed_cmd = MMC_PACKED_NONE;
>> >> > + mq->mqrq_cur->packed_num = 0;
>> >> > + }
>> >> > mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
>> >> > mmc_start_req(card->host, &mq->mqrq_cur->mmc_active, NULL);
>> >> > }
>> >> > diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
>> >> > index 2517547..af7aee5 100644
>> >> > --- a/drivers/mmc/card/queue.c
>> >> > +++ b/drivers/mmc/card/queue.c
>> >> > @@ -177,6 +177,8 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
>> >> >
>> >> > memset(&mq->mqrq_cur, 0, sizeof(mq->mqrq_cur));
>> >> > memset(&mq->mqrq_prev, 0, sizeof(mq->mqrq_prev));
>> >> > + INIT_LIST_HEAD(&mqrq_cur->packed_list);
>> >> > + INIT_LIST_HEAD(&mqrq_prev->packed_list);
>> >> > mq->mqrq_cur = mqrq_cur;
>> >> > mq->mqrq_prev = mqrq_prev;
>> >> > mq->queue->queuedata = mq;
>> >> > @@ -377,6 +379,39 @@ void mmc_queue_resume(struct mmc_queue *mq)
>> >> > }
>> >> > }
>> >> >
>> >> > +static unsigned int mmc_queue_packed_map_sg(struct mmc_queue *mq,
>> >> > + struct mmc_queue_req *mqrq,
>> >> > + struct scatterlist *sg)
>> >> > +{
>> >> > + struct scatterlist *__sg;
>> >> > + unsigned int sg_len = 0;
>> >> > + struct request *req;
>> >> > + enum mmc_packed_cmd cmd;
>> >> > +
>> >> > + cmd = mqrq->packed_cmd;
>> >> > +
>> >> > + if (cmd == MMC_PACKED_WR_HDR || cmd == MMC_PACKED_WRITE) {
>> >>
>> >> Why we do not need to handle MMC_PACKED_READ case ?
>> > This conditions is for the packed header.
>> > MMC_PACKED_READ is related with MMC_PACKED_WR_HDR.
>> >
>> > Thanks.
>> > Seungwon Jeon.
>> >>
>> >> > + __sg = sg;
>> >> > + sg_set_buf(__sg, mqrq->packed_cmd_hdr,
>> >> > + sizeof(mqrq->packed_cmd_hdr));
>> >> > + sg_len++;
>> >> > + if (cmd == MMC_PACKED_WR_HDR) {
>> >> > + sg_mark_end(__sg);
>> >> > + return sg_len;
>> >> > + }
>> >> > + __sg->page_link &= ~0x02;
>> >> > + }
>> >> > +
>> >> > + __sg = sg + sg_len;
>> >> > + list_for_each_entry(req, &mqrq->packed_list, queuelist) {
>> >> > + sg_len += blk_rq_map_sg(mq->queue, req, __sg);
>> >> > + __sg = sg + (sg_len - 1);
>> >> > + (__sg++)->page_link &= ~0x02;
>> >> > + }
>> >> > + sg_mark_end(sg + (sg_len - 1));
>> >> > + return sg_len;
>> >> > +}
>> >> > +
>> >> > /*
>> >> > * Prepare the sg list(s) to be handed of to the host driver
>> >> > */
>> >> > @@ -387,12 +422,19 @@ unsigned int mmc_queue_map_sg(struct mmc_queue *mq, struct mmc_queue_req
>> *mqrq)
>> >> > struct scatterlist *sg;
>> >> > int i;
>> >> >
>> >> > - if (!mqrq->bounce_buf)
>> >> > - return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
>> >> > + if (!mqrq->bounce_buf) {
>> >> > + if (!list_empty(&mqrq->packed_list))
>> >> > + return mmc_queue_packed_map_sg(mq, mqrq, mqrq->sg);
>> >> > + else
>> >> > + return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
>> >> > + }
>> >> >
>> >> > BUG_ON(!mqrq->bounce_sg);
>> >> >
>> >> > - sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg);
>> >> > + if (!list_empty(&mqrq->packed_list))
>> >> > + sg_len = mmc_queue_packed_map_sg(mq, mqrq, mqrq->bounce_sg);
>> >> > + else
>> >> > + sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg);
>> >> >
>> >> > mqrq->bounce_sg_len = sg_len;
>> >> >
>> >> > diff --git a/drivers/mmc/card/queue.h b/drivers/mmc/card/queue.h
>> >> > index d2a1eb4..be58b3c 100644
>> >> > --- a/drivers/mmc/card/queue.h
>> >> > +++ b/drivers/mmc/card/queue.h
>> >> > @@ -12,6 +12,13 @@ struct mmc_blk_request {
>> >> > struct mmc_data data;
>> >> > };
>> >> >
>> >> > +enum mmc_packed_cmd {
>> >> > + MMC_PACKED_NONE = 0,
>> >> > + MMC_PACKED_WR_HDR,
>> >> > + MMC_PACKED_WRITE,
>> >> > + MMC_PACKED_READ,
>> >> > +};
>> >> > +
>> >> > struct mmc_queue_req {
>> >> > struct request *req;
>> >> > struct mmc_blk_request brq;
>> >> > @@ -20,6 +27,12 @@ struct mmc_queue_req {
>> >> > struct scatterlist *bounce_sg;
>> >> > unsigned int bounce_sg_len;
>> >> > struct mmc_async_req mmc_active;
>> >> > + struct list_head packed_list;
>> >> > + u32 packed_cmd_hdr[128];
>> >> > + unsigned int packed_blocks;
>> >> > + enum mmc_packed_cmd packed_cmd;
>> >> > + int packed_fail_idx;
>> >> > + u8 packed_num;
>> >> > };
>> >> >
>> >> > struct mmc_queue {
>> >> > diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
>> >> > index 30055f2..10350ce 100644
>> >> > --- a/drivers/mmc/core/host.c
>> >> > +++ b/drivers/mmc/core/host.c
>> >> > @@ -346,6 +346,8 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
>> >> > host->max_blk_size = 512;
>> >> > host->max_blk_count = PAGE_CACHE_SIZE / 512;
>> >> >
>> >> > + host->packed_min = 2;
>> >> > +
>> >> > return host;
>> >> >
>> >> > free:
>> >> > diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
>> >> > index 4d41fa9..1e17bd7 100644
>> >> > --- a/drivers/mmc/core/mmc_ops.c
>> >> > +++ b/drivers/mmc/core/mmc_ops.c
>> >> > @@ -335,6 +335,7 @@ int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
>> >> > return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD,
>> >> > ext_csd, 512);
>> >> > }
>> >> > +EXPORT_SYMBOL_GPL(mmc_send_ext_csd);
>> >> >
>> >> > int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
>> >> > {
>> >> > diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
>> >> > index 87a976c..07a4149 100644
>> >> > --- a/include/linux/mmc/core.h
>> >> > +++ b/include/linux/mmc/core.h
>> >> > @@ -18,6 +18,8 @@ struct mmc_request;
>> >> > struct mmc_command {
>> >> > u32 opcode;
>> >> > u32 arg;
>> >> > +#define MMC_CMD23_ARG_REL_WR (1 << 31)
>> >> > +#define MMC_CMD23_ARG_PACKED ((0 << 31) | (1 << 30))
>> >> > u32 resp[4];
>> >> > unsigned int flags; /* expected response type */
>> >> > #define MMC_RSP_PRESENT (1 << 0)
>> >> > @@ -143,6 +145,7 @@ extern int mmc_app_cmd(struct mmc_host *, struct mmc_card *);
>> >> > extern int mmc_wait_for_app_cmd(struct mmc_host *, struct mmc_card *,
>> >> > struct mmc_command *, int);
>> >> > extern int mmc_switch(struct mmc_card *, u8, u8, u8, unsigned int);
>> >> > +extern int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd);
>> >> >
>> >> > #define MMC_ERASE_ARG 0x00000000
>> >> > #define MMC_SECURE_ERASE_ARG 0x80000000
>> >> > diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
>> >> > index e22f541..8984259 100644
>> >> > --- a/include/linux/mmc/host.h
>> >> > +++ b/include/linux/mmc/host.h
>> >> > @@ -286,6 +286,9 @@ struct mmc_host {
>> >> > unsigned int max_blk_count; /* maximum number of blocks in one req */
>> >> > unsigned int max_discard_to; /* max. discard timeout in ms */
>> >> >
>> >> > + u8 packed_min; /* minimum number of packed entries */
>> >> > +
>> >> > +
>> >> > /* private data */
>> >> > spinlock_t lock; /* lock for claim and bus ops */
>> >> >
>> >> > --
>> >> > 1.7.0.4
>> >> >
>> >> >
>> >> > --
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>> >> > the body of a message to majordomo@xxxxxxxxxxxxxxx
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>> >
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