RE: [PATCH RESEND v7 2/3] mmc: core: Support packed write command foreMMC4.5 device
From: Seungwon Jeon
Date: Mon Jun 25 2012 - 23:48:30 EST
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.
> 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
>
> --
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