RE: [PATCH RESEND v7 2/3] mmc: core: Support packed write command foreMMC4.5 device
From: Seungwon Jeon
Date: Thu Jun 28 2012 - 03:52:13 EST
Saugata Das <saugata.das@xxxxxxxxxx> wrote:
> On 26 June 2012 09:18, Seungwon Jeon <tgih.jun@xxxxxxxxxxx> wrote:
> > Hi Subhash,
> >
> > Subhash Jadavani <subhashj@xxxxxxxxxxxxxx> wrote:
> >> Hi Seungwon,
> >>
> >> Please one comment inline below related to large sector size handling for packed commands.
> >>
> >> Regards,
> >> Subhash
> >>
> >> > -----Original Message-----
> >> > From: linux-mmc-owner@xxxxxxxxxxxxxxx [mailto:linux-mmc-
> >> > owner@xxxxxxxxxxxxxxx] On Behalf Of Seungwon Jeon
> >> > Sent: Monday, June 18, 2012 11:13 AM
> >> > To: linux-mmc@xxxxxxxxxxxxxxx
> >> > Cc: linux-kernel@xxxxxxxxxxxxxxx; 'Chris Ball'; 'Maya Erez'; 'Subhash Jadavani';
> >> > 'S, Venkatraman'
> >> > Subject: [PATCH RESEND v7 2/3] mmc: core: Support packed write command
> >> > for eMMC4.5 device
> >> >
> >> > This patch supports packed write command of eMMC4.5 device.
> >> > Several 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 | 406
> >> > +++++++++++++++++++++++++++++++++++++++++---
> >> > drivers/mmc/card/queue.c | 45 +++++-
> >> > drivers/mmc/card/queue.h | 12 ++
> >> > drivers/mmc/core/mmc_ops.c | 1 +
> >> > include/linux/mmc/core.h | 4 +
> >> > 5 files changed, 441 insertions(+), 27 deletions(-)
> >> >
> >> > diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c index
> >> > 7e3f453..eb99e35 100644
> >> > --- a/drivers/mmc/card/block.c
> >> > +++ b/drivers/mmc/card/block.c
> >> > @@ -58,6 +58,12 @@ 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_WR 0x02
> >> > +
> >> > static DEFINE_MUTEX(block_mutex);
> >> >
> >> > /*
> >> > @@ -123,9 +129,21 @@ enum mmc_blk_status {
> >> > MMC_BLK_NOMEDIUM,
> >> > };
> >> >
> >> > +enum {
> >> > + MMC_PACKED_N_IDX = -1,
> >> > + MMC_PACKED_N_ZERO,
> >> > + MMC_PACKED_N_SINGLE,
> >> > +};
> >> > +
> >> > module_param(perdev_minors, int, 0444);
> >> > MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per
> >> > device");
> >> >
> >> > +static inline void mmc_blk_clear_packed(struct mmc_queue_req *mqrq) {
> >> > + mqrq->packed_cmd = MMC_PACKED_NONE;
> >> > + mqrq->packed_num = MMC_PACKED_N_ZERO;
> >> > +}
> >> > +
> >> > static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk) {
> >> > struct mmc_blk_data *md;
> >> > @@ -1081,12 +1099,61 @@ 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];
> >> > +
> >> > + mq_rq->packed_retries--;
> >> > + 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,
> >> > @@ -1241,10 +1308,197 @@ 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;
> >> > +
> >> > + mmc_blk_clear_packed(mq->mqrq_cur);
> >> > +
> >> > + if (!(md->flags & MMC_BLK_CMD23) ||
> >> > + !card->ext_csd.packed_event_en)
> >> > + goto no_packed;
> >> > +
> >> > + if ((rq_data_dir(cur) == WRITE) &&
> >> > + (card->host->caps2 & MMC_CAP2_PACKED_WR))
> >> > + 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 += cur->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;
> >> > + mq->mqrq_cur->packed_retries = reqs;
> >> > + return reqs;
> >> > + }
> >> > +
> >> > +no_packed:
> >> > + mmc_blk_clear_packed(mq->mqrq_cur);
> >> > + return 0;
> >> > +}
> >> > +
> >> > +static void mmc_blk_packed_hdr_wrq_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;
> >> > + struct request *prq;
> >> > + struct mmc_blk_data *md = mq->data;
> >> > + bool do_rel_wr, do_data_tag;
> >> > + u32 *packed_cmd_hdr = mqrq->packed_cmd_hdr;
> >> > + u8 i = 1;
> >> > +
> >> > + mqrq->packed_cmd = MMC_PACKED_WRITE;
> >> > + mqrq->packed_blocks = 0;
> >> > + mqrq->packed_fail_idx = MMC_PACKED_N_IDX;
> >> > +
> >> > + memset(packed_cmd_hdr, 0, sizeof(mqrq->packed_cmd_hdr));
> >> > + packed_cmd_hdr[0] = (mqrq->packed_num << 16) |
> >> > + (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);
> >> > + do_data_tag = (card->ext_csd.data_tag_unit_size) &&
> >> > + (prq->cmd_flags & REQ_META) &&
> >> > + (rq_data_dir(prq) == WRITE) &&
> >> > + ((brq->data.blocks * brq->data.blksz) >=
> >> > + card->ext_csd.data_tag_unit_size);
> >> > + /* Argument of CMD23 */
> >> > + packed_cmd_hdr[(i * 2)] =
> >> > + (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
> >> > + (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 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 | (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;
> >> > + brq->data.blocks = 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 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.
> >> > @@ -1261,10 +1515,73 @@ static int mmc_blk_cmd_err(struct mmc_blk_data
> >> > *md, struct mmc_card *card,
> >> > ret = blk_end_request(req, 0, blocks << 9);
> >> > }
> >> > } else {
> >> > - ret = blk_end_request(req, 0, brq->data.bytes_xfered);
> >> > + if (mq_rq->packed_cmd == MMC_PACKED_NONE)
> >> > + ret = blk_end_request(req, 0, brq->data.bytes_xfered);
> >> > + }
> >> > + return ret;
> >> > +}
> >> > +
> >> > +static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq) {
> >> > + struct request *prq;
> >> > + int idx = mq_rq->packed_fail_idx, i = 0;
> >> > + int ret = 0;
> >> > +
> >> > + while (!list_empty(&mq_rq->packed_list)) {
> >> > + prq = list_entry_rq(mq_rq->packed_list.next);
> >> > + if (idx == i) {
> >> > + /* retry from error index */
> >> > + mq_rq->packed_num -= idx;
> >> > + mq_rq->req = prq;
> >> > + ret = 1;
> >> > +
> >> > + if (mq_rq->packed_num == MMC_PACKED_N_SINGLE)
> >> > {
> >> > + list_del_init(&prq->queuelist);
> >> > + mmc_blk_clear_packed(mq_rq);
> >> > + }
> >> > + return ret;
> >> > + }
> >> > + list_del_init(&prq->queuelist);
> >> > + blk_end_request(prq, 0, blk_rq_bytes(prq));
> >> > + i++;
> >> > }
> >> > +
> >> > + mmc_blk_clear_packed(mq_rq);
> >> > return ret;
> >> > }
> >> > +static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq) {
> >> > + struct request *prq;
> >> > +
> >> > + while (!list_empty(&mq_rq->packed_list)) {
> >> > + prq = list_entry_rq(mq_rq->packed_list.next);
> >> > + list_del_init(&prq->queuelist);
> >> > + blk_end_request(prq, -EIO, blk_rq_bytes(prq));
> >> > + }
> >> > +
> >> > + mmc_blk_clear_packed(mq_rq);
> >> > +}
> >> > +
> >> > +static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
> >> > + struct mmc_queue_req *mq_rq)
> >> > +{
> >> > + struct request *prq;
> >> > + struct request_queue *q = mq->queue;
> >> > +
> >> > + while (!list_empty(&mq_rq->packed_list)) {
> >> > + prq = list_entry_rq(mq_rq->packed_list.prev);
> >> > + if (prq->queuelist.prev != &mq_rq->packed_list) {
> >> > + list_del_init(&prq->queuelist);
> >> > + spin_lock_irq(q->queue_lock);
> >> > + blk_requeue_request(mq->queue, prq);
> >> > + spin_unlock_irq(q->queue_lock);
> >> > + } else {
> >> > + list_del_init(&prq->queuelist);
> >> > + }
> >> > + }
> >> > +
> >> > + mmc_blk_clear_packed(mq_rq);
> >> > +}
> >> >
> >> > static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> >> > { @@ -1276,23 +1593,35 @@ static int mmc_blk_issue_rw_rq(struct
> >> > mmc_queue *mq, struct request *rqc)
> >> > struct mmc_queue_req *mq_rq;
> >> > struct request *req = rqc;
> >> > struct mmc_async_req *areq;
> >> > + const u8 packed_num = 2;
> >> > + u8 reqs = 0;
> >> >
> >> > if (!rqc && !mq->mqrq_prev->req)
> >> > return 0;
> >> >
> >> > + if (rqc) {
> >> > + /*
> >> > + * When 4KB native sector is enabled, only 8 blocks
> >> > + * multiple read or write is allowed
> >> > + */
> >> > + if ((brq->data.blocks & 0x07) &&
> >>
> >> What will be the value of "brq->data.blocks" here? I don't think this has been even initialized
> here.
> > Right, "brq->data.blocks" doesn't have the value.
> > This have been already introduced in "mmc: block: Allow disabling 512B sector size emulation"
> > but it seems to have the same problem. I'll fix this for next version.
>
> Thanks for pointing it out.
>
> Should I submit the correction for this part separately (changing
> (brq->data.blocks & 0x07) to (blk_rq_sectors(req) & 0x07) ?
Course you can. I'm waiting.
Thanks,
Seungwon Jeon
>
>
> >
> >> Also this is what specification (6.6.30.2 Native 4KB sector behavior) mandates for large sector
> size
> >> native:
> >> - Sector counts shall be multiples of 8 (4KB), e.g. in SET_BLOCK_COUNT (CMD23), and
> >> CORRECTLY_PRG_SECTORS_NUM field in EXT_CSD
> >> - Arguments for read commands (CMD17/18) and write commands (CMD24/25) shall always be aligned
> >> to 8 (4KB)
> >>
> >> So for each entry (which is for each request) in packed command header, you need to make sure that
> >> sector count is in multiple of 8 for CMD23 argument and also CMD18/CMD25 arguments (sector address)
> >> must be 4KB aligned.
> > I'll also apply this.
> >
> > Best regard,
> > Seungwon Jeon
> >>
> >> Regards,
> >> Subhash
> >>
> >> > + (card->ext_csd.data_sector_size == 4096)) {
> >> > + pr_err("%s: Transfer size is not 4KB sector size
> >> > aligned\n",
> >> > + req->rq_disk->disk_name);
> >> > + mq_rq = mq->mqrq_cur;
> >> > + goto cmd_abort;
> >> > + }
> >> > +
> >> > + reqs = mmc_blk_prep_packed_list(mq, rqc);
> >> > + }
> >> > +
> >> > do {
> >> > if (rqc) {
> >> > - /*
> >> > - * When 4KB native sector is enabled, only 8 blocks
> >> > - * multiple read or write is allowed
> >> > - */
> >> > - if ((brq->data.blocks & 0x07) &&
> >> > - (card->ext_csd.data_sector_size == 4096)) {
> >> > - pr_err("%s: Transfer size is not 4KB sector size
> >> > aligned\n",
> >> > - req->rq_disk->disk_name);
> >> > - goto cmd_abort;
> >> > - }
> >> > - mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
> >> > + if (reqs >= packed_num)
> >> > + mmc_blk_packed_hdr_wrq_prep(mq-
> >> > >mqrq_cur,
> >> > + card, mq);
> >> > + else
> >> > + mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0,
> >> > mq);
> >> > areq = &mq->mqrq_cur->mmc_active;
> >> > } else
> >> > areq = NULL;
> >> > @@ -1313,8 +1642,15 @@ 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);
> >> > - ret = blk_end_request(req, 0,
> >> > +
> >> > + if (mq_rq->packed_cmd != MMC_PACKED_NONE) {
> >> > + ret = mmc_blk_end_packed_req(mq_rq);
> >> > + break;
> >> > + } else {
> >> > + ret = blk_end_request(req, 0,
> >> > brq->data.bytes_xfered);
> >> > + }
> >> > +
> >> > /*
> >> > * If the blk_end_request function returns non-zero
> >> > even
> >> > * though all data has been transferred and no errors
> >> > @@ -1347,7 +1683,8 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue
> >> > *mq, struct request *rqc)
> >> > err = mmc_blk_reset(md, card->host, type);
> >> > if (!err)
> >> > break;
> >> > - if (err == -ENODEV)
> >> > + if (err == -ENODEV ||
> >> > + mq_rq->packed_cmd !=
> >> > MMC_PACKED_NONE)
> >> > goto cmd_abort;
> >> > /* Fall through */
> >> > }
> >> > @@ -1374,25 +1711,46 @@ 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 {
> >> > + if (!mq_rq->packed_retries)
> >> > + goto cmd_abort;
> >> > + mmc_blk_packed_hdr_wrq_prep(mq_rq, card,
> >> > mq);
> >> > + mmc_start_req(card->host,
> >> > + &mq_rq->mmc_active, NULL);
> >> > + }
> >> > }
> >> > } while (ret);
> >> >
> >> > return 1;
> >> >
> >> > cmd_abort:
> >> > - if (mmc_card_removed(card))
> >> > - req->cmd_flags |= REQ_QUIET;
> >> > - while (ret)
> >> > - ret = blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
> >> > + if (mq_rq->packed_cmd == MMC_PACKED_NONE) {
> >> > + if (mmc_card_removed(card))
> >> > + req->cmd_flags |= REQ_QUIET;
> >> > + while (ret)
> >> > + ret = blk_end_request(req, -EIO,
> >> > + blk_rq_cur_bytes(req));
> >> > + } else {
> >> > + mmc_blk_abort_packed_req(mq_rq);
> >> > + }
> >> >
> >> > start_new_req:
> >> > if (rqc) {
> >> > + /*
> >> > + * If current request is packed, it needs to put back.
> >> > + */
> >> > + if (mq->mqrq_cur->packed_cmd != MMC_PACKED_NONE)
> >> > + mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
> >> > +
> >> > 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
> >> > e360a97..165d85a 100644
> >> > --- a/drivers/mmc/card/queue.c
> >> > +++ b/drivers/mmc/card/queue.c
> >> > @@ -175,6 +175,9 @@ int mmc_init_queue(struct mmc_queue *mq, struct
> >> > mmc_card *card,
> >> > if (!mq->queue)
> >> > return -ENOMEM;
> >> >
> >> > + 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;
> >> > @@ -375,6 +378,35 @@ 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_WRITE) {
> >> > + __sg = sg;
> >> > + sg_set_buf(__sg, mqrq->packed_cmd_hdr,
> >> > + sizeof(mqrq->packed_cmd_hdr));
> >> > + 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
> >> > */
> >> > @@ -385,12 +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..5e04938 100644
> >> > --- a/drivers/mmc/card/queue.h
> >> > +++ b/drivers/mmc/card/queue.h
> >> > @@ -12,6 +12,11 @@ struct mmc_blk_request {
> >> > struct mmc_data data;
> >> > };
> >> >
> >> > +enum mmc_packed_cmd {
> >> > + MMC_PACKED_NONE = 0,
> >> > + MMC_PACKED_WRITE,
> >> > +};
> >> > +
> >> > struct mmc_queue_req {
> >> > struct request *req;
> >> > struct mmc_blk_request brq;
> >> > @@ -20,6 +25,13 @@ 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_retries;
> >> > + int packed_fail_idx;
> >> > + u8 packed_num;
> >> > };
> >> >
> >> > struct mmc_queue {
> >> > diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
> >> > index 69370f4..2a2fed8 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
> >> > 1b431c7..d787037 100644
> >> > --- a/include/linux/mmc/core.h
> >> > +++ b/include/linux/mmc/core.h
> >> > @@ -18,6 +18,9 @@ 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))
> >> > +#define MMC_CMD23_ARG_TAG_REQ (1 << 29)
> >> > u32 resp[4];
> >> > unsigned int flags; /* expected response type */
> >> > #define MMC_RSP_PRESENT (1 << 0)
> >> > @@ -143,6 +146,7 @@ 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
> >> > --
> >> > 1.7.0.4
> >> >
> >> >
> >> > --
> >> > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
> >> > the body of a message to majordomo@xxxxxxxxxxxxxxx
> >> > More majordomo info at http://vger.kernel.org/majordomo-info.html
> >>
> >> --
> >> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
> >> the body of a message to majordomo@xxxxxxxxxxxxxxx
> >> More majordomo info at http://vger.kernel.org/majordomo-info.html
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
> > the body of a message to majordomo@xxxxxxxxxxxxxxx
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
> --
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