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SubjectRe: [PATCH 2/2] mmc: core: Support packed command for eMMC4.5 device
On Thu, Nov 3, 2011 at 7:23 AM, Seungwon Jeon <tgih.jun@samsung.com> wrote:
> S, Venkatraman <svenkatr@ti.com> wrote:
>> On Wed, Nov 2, 2011 at 1:33 PM, Seungwon Jeon <tgih.jun@samsung.com> 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@samsung.com>
>> > ---
>> >  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.

>> > +
>> > +               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.

>>
>>
>> > +                               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.
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