S, Venkatraman <svenkatr@xxxxxx> wrote:
> On Thu, Nov 3, 2011 at 7:23 AM, Seungwon Jeon <tgih.jun@xxxxxxxxxxx> wrote:
> > S, Venkatraman <svenkatr@xxxxxx> wrote:
> >> On Wed, Nov 2, 2011 at 1:33 PM, 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 | 355 ++++++++++++++++++++++++++++++++++++++++++++--
> >> > drivers/mmc/card/queue.c | 48 ++++++-
> >> > drivers/mmc/card/queue.h | 12 ++
> >> > include/linux/mmc/core.h | 3 +
> >> > 4 files changed, 404 insertions(+), 14 deletions(-)
> >> >
> >> > diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
> >> > index a1cb21f..6c49656 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);
> >> >
> >> > /*
> >> > @@ -943,7 +950,8 @@ 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);
> >> > @@ -980,12 +988,67 @@ 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_mrq = container_of(areq, struct mmc_queue_req,
> >> > + mmc_active);
> >> > + int err, check, status;
> >> > + u8 ext_csd[512];
> >> > +
> >> > + check = mmc_blk_err_check(card, areq);
> >> > +
> >> > + if (check == MMC_BLK_SUCCESS)
> >> > + return check;
> >> > +
> >> > + if (check == MMC_BLK_PARTIAL) {
> >> > + err = get_card_status(card, &status, 0);
> >> > + if (err)
> >> > + return MMC_BLK_ABORT;
> >> > +
> >> > + if (status & R1_EXP_EVENT) {
> >> > + err = mmc_send_ext_csd(card, ext_csd);
> >> > + if (err)
> >> > + return MMC_BLK_ABORT;
> >> > +
> >> > + if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS + 0] &
> >> > + 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) {
> >> > + /* Make be 0-based */
> >> > + mq_mrq->packed_fail_idx =
> >> > + ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
> >> > + return MMC_BLK_PARTIAL;
> >> > + } else {
> >> > + return MMC_BLK_RETRY;
> >> > + }
> >> > + }
> >> > + } else {
> >> > + return MMC_BLK_RETRY;
> >> > + }
> >> > + }
> >> > +
> >> > + if (check != MMC_BLK_ABORT)
> >> > + return MMC_BLK_RETRY;
> >> > + else
> >> > + return MMC_BLK_ABORT;
> >> > +}
> >> > +
> >> > static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
> >> > struct mmc_card *card,
> >> > int disable_multi,
> >> > @@ -1129,6 +1192,211 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
> >> > mmc_queue_bounce_pre(mqrq);
> >> > }
> >> >
> >> > +static u8 mmc_blk_chk_packable(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 max_packed_rw = 0;
> >> > + u8 reqs = 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;
> >> > + }
> >> > +
> >> > + 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) {
> >> > + next = blk_fetch_request(q);
> >> > + if (!next)
> >> > + break;
> >> > +
> >> > + if (rq_data_dir(cur) != rq_data_dir(next)) {
> >> > + blk_requeue_request(q, next);
> >> > + break;
> >> > + }
> >> > +
> >> > + if (mmc_req_rel_wr(next) &&
> >> > + (md->flags & MMC_BLK_REL_WR) &&
> >> > + !en_rel_wr) {
> >> > + blk_requeue_request(q, next);
> >> > + break;
> >> > + }
> >> > +
> >> > + req_sectors += blk_rq_sectors(next);
> >> > + if (req_sectors > max_blk_count) {
> >> > + blk_requeue_request(q, next);
> >> > + break;
> >> > + }
> >> > +
> >> > + phys_segments += next->nr_phys_segments;
> >> > + if (phys_segments > max_phys_segs) {
> >> > + blk_requeue_request(q, next);
> >> > + break;
> >> > + }
> >> I mentioned this before - if the next request is not packable and requeued,
> >> blk_fetch_request will retrieve it again and this while loop will
> >> never terminate.
> >>
> > If next request is not packable, it is requeued and 'break' terminates this loop.
> > So it not infinite.
>
> Right !! But that doesn't help finding the commands that are packable.
> Ideally, you'd need to pack all neighbouring requests into one packed command.
> The way CFQ works, it is not necessary that the fetch would return all
> outstanding
> requests that are packable (unless you invoke a forced dispatch)
>
> It would be good to see some numbers on the number of pack hits / misses that
> you would encounter with this logic, on a typical usecase.
>
Is it considered only for CFQ scheduler? How about other I/O scheduler?
If all requests are drained from scheduler queue forcedly,
the number of candidate to be packed can be increased.
However we may lose the unique CFQ's strength and MMC D/D may take the CFQ's duty.
Basically, this patch accommodates the origin order requests from I/O scheduler.
> >> > +
> >> > + list_add_tail(&next->queuelist, &mq->mqrq_cur->packed_list);
> >> > + cur = next;
> >> > + reqs++;
> >> > + }
> >> > +
> >> > + if (reqs > 0) {
> >> > + list_add(&req->queuelist, &mq->mqrq_cur->packed_list);
> >> > + return (reqs + 1);
> >> > + }
> >> > +
> >> > +no_packed:
> >> > + mq->mqrq_cur->packed_cmd = MMC_PACKED_NONE;
> >> > + return reqs;
> >> > +}
> >> > +
> >> > +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);
> >> > + /* 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;
> >> > +
> >> > + 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)
> >> > @@ -1166,15 +1434,33 @@ 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_chk_packable(mq, rqc);
> >> > +
> >> > do {
> >> > if (rqc) {
> >> > - mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
> >> > + if (reqs >= 2) {
> >> > + mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur, card, mq, reqs);
> >> > + if (rq_data_dir(rqc) == READ) {
> >> > + areq = &mq->mqrq_cur->mmc_active;
> >> > + mmc_wait_for_req(card->host, areq->mrq);
> >> > + status = mmc_blk_packed_err_check(card, areq);
> >> > + if (status == MMC_BLK_SUCCESS) {
> >> > + mmc_blk_packed_rrq_prep(mq->mqrq_cur, card, mq);
> >> > + } else {
> >> > + goto check_status;
> >> > + }
> >> > + }
> >> > + } else {
> >>
> >> IIUC, the code in mmc_blk_chk_packable
> >> <snip>
> >> if (reqs > 0) {
> >> list_add(&req->queuelist, &mq->mqrq_cur->packed_list);
> >> return (reqs + 1);
> >> </snip>
> >> adds the request to the packed list, and needs to be reversed if it's
> >> decided to not to do a packed request ?
> > Any condition or reason not to do packed request after several requests
> > is added in packed list? I didn't catch your comment exactly.
> >
> What I meant was that the request should be removed from queuelist
> when you decide not to pack.
>
After request is add to packed list, it needs to decide not to pack?
Could you explain that case?
mmc_blk_chk_packable decides whether packing is possible or not.
If possible, it returns non-zero value.
If not, it return zero. Of course, packed_list is empty in this time.
I don't know what you concern.
> >>
> >>
> >> > + mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
> >> > + }
> >> > areq = &mq->mqrq_cur->mmc_active;
> >> > } else
> >> > areq = NULL;
> >> > @@ -1182,6 +1468,7 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> >> > if (!areq)
> >> > return 0;
> >> >
> >> > +check_status:
> >> > mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
> >> > brq = &mq_rq->brq;
> >> > req = mq_rq->req;
> >> > @@ -1195,10 +1482,32 @@ 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);
> >> > + if (idx == i) {
> >> > + /* retry from error index */
> >> > + reqs -= idx;
> >> > + mq_rq->req = prq;
> >> > + ret = 1;
> >> > + break;
> >> > + }
> >> > + list_del_init(&prq->queuelist);
> >> > + spin_lock_irq(&md->lock);
> >> > + ret = __blk_end_request(prq, 0, blk_rq_bytes(prq));
> >> > + spin_unlock_irq(&md->lock);
> >> > + i++;
> >> > + }
> >> > + 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
> >> > @@ -1257,7 +1566,7 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> >> > break;
> >> > }
> >> >
> >> > - if (ret) {
> >> > + if (ret && (mq_rq->packed_cmd == MMC_PACKED_NONE)) {
> >> > /*
> >> > * In case of a incomplete request
> >> > * prepare it again and resend.
> >> > @@ -1270,13 +1579,37 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> >> > return 1;
> >> >
> >> > cmd_abort:
> >> > - spin_lock_irq(&md->lock);
> >> > - 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);
> >> > + 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);
> >> > + blk_requeue_request(mq->queue, prq);
> >> > + } else {
> >> > + list_del_init(&prq->queuelist);
> >> > + }
> >> > + }
> >> > + }
> >> > 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 dcad59c..3a4542e 100644
> >> > --- a/drivers/mmc/card/queue.c
> >> > +++ b/drivers/mmc/card/queue.c
> >> > @@ -172,6 +172,8 @@ 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;
> >> > @@ -372,6 +374,39 @@ 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) {
> >> > + __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
> >> > */
> >> > @@ -382,12 +417,19 @@ 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..5d0131e 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 +27,11 @@ 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;
> >> > };
> >> >
> >> > struct mmc_queue {
> >> > diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
> >> > index 174a844..3c61d5a 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);
> >>
> >> Stray change / doesn't belong to this patch.
> > Do you mean to split this in another patch?
> >
> Yes. In fact all the changes to the header files are independent of
> the implementation, so they belong to a separate patch.
I considered your opinion.
But it seems not big trouble even though being kept.
Thanks.
Seungwon Jeon.
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