RE: [PATCH] mmc: core: Add packed command for eMMC4.5 device

From: Seungwon Jeon
Date: Fri Oct 28 2011 - 01:44:16 EST

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S, Venkatraman <svenkatr@xxxxxx> wrote:
> On Thu, Oct 27, 2011 at 4:24 PM, Seungwon Jeon <tgih.jun@xxxxxxxxxxx> wrote:
> > This patch supports packed command feature of eMMC4.5 Spec.
> > Several reads(or writes) can be grouped in packed command
> > and all data of the individual commands can be sent in one
> > transfer on the bus.
> >
> > Signed-off-by: Seungwon Jeon <tgih.jun@xxxxxxxxxxx>
> > ---
> > drivers/mmc/card/block.c | 349 ++++++++++++++++++++++++++++++++++++++++++++--
> > drivers/mmc/card/queue.c | 48 ++++++-
> > drivers/mmc/card/queue.h | 12 ++
> > drivers/mmc/core/mmc.c | 20 +++
> > include/linux/mmc/card.h | 3 +
> > include/linux/mmc/host.h | 1 +
> > include/linux/mmc/mmc.h | 15 ++
> > 7 files changed, 434 insertions(+), 14 deletions(-)
> >
> > diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
> > index 4fd5723..0258a81 100644
> > --- a/drivers/mmc/card/block.c
> > +++ b/drivers/mmc/card/block.c
> > @@ -45,6 +45,7 @@
> > #include <asm/uaccess.h>
> >
> > #include "queue.h"
> > +#include "../core/mmc_ops.h"
>
> I don't think this is the right way to include files. The core
> directory should be in the include path already.
Ok, I'll make be well-formed.
>
> >
> > MODULE_ALIAS("mmc:block");
> > #ifdef MODULE_PARAM_PREFIX
> > @@ -59,6 +60,10 @@ 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))
> > +
> > static DEFINE_MUTEX(block_mutex);
> >
> > /*
> > @@ -943,7 +948,8 @@ 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 +986,67 @@ 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,
> > @@ -1126,6 +1187,207 @@ 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);
> > + 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;
> > + }
> > +
> > + list_add_tail(&next->queuelist, &mq->mqrq_cur->packed_list);
> > + cur = next;
> > + reqs++;
> > + }
>
> IIRC, blk_fetch_request gets it from the top of the request_queue and
> blk_requeue_request puts it back to the top of the queue
> (request_queue->queue_head). Hence, possibly, this loop will keep
> fetching and requeing the same request repeatedly ?
Right. If fetched request is not packable to previous requests,
then it will be queued to top of request_queue.
>
>
> > +
> > + 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) ? 0x01 : 0x02) << 8) | (0x01 << 0);
> > +
> Too many magic numbers here.
Ok. It will be modified.
>
> > + /*
> > + * 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 ? (1 << 31) : 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 = (0 << 31) | (1 << 30) |
> > + ((rq_data_dir(req) == READ) ? 1 : mqrq->packed_blocks + 1);
>
> .. and here ^^..
>
> > + 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)
> > @@ -1163,15 +1425,33 @@ 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 {
> > + mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
> > + }
> > areq = &mq->mqrq_cur->mmc_active;
> > } else
> > areq = NULL;
> > @@ -1179,6 +1459,7 @@ 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;
> > @@ -1192,10 +1473,32 @@ 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
> > @@ -1254,7 +1557,7 @@ 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.
> > @@ -1267,13 +1570,37 @@ 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/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> > index 3627044..eab01c1 100644
> > --- a/drivers/mmc/core/mmc.c
> > +++ b/drivers/mmc/core/mmc.c
> > @@ -487,6 +487,9 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
> > ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
> > ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
> > ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
> > +
> > + card->ext_csd.max_packed_writes = ext_csd[EXT_CSD_MAX_PACKED_WRITES];
> > + card->ext_csd.max_packed_reads = ext_csd[EXT_CSD_MAX_PACKED_READS];
> > }
> >
> > out:
> > @@ -1072,6 +1075,23 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
> > card->ext_csd.cache_ctrl = err ? 0 : 1;
> > }
> >
> > + if ((host->caps2 & MMC_CAP2_PACKED_CMD) &&
> > + (card->ext_csd.max_packed_writes > 0) &&
> > + (card->ext_csd.max_packed_reads > 0)) {
> > + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> > + EXT_CSD_EXP_EVENTS_CTRL,
> > + EXT_CSD_PACKED_EVENT_EN,
> > + card->ext_csd.generic_cmd6_time);
> > + if (err && err != -EBADMSG)
> > + goto free_card;
> > + if (err) {
> > + pr_warning("%s: Enabling packed event failed\n",
> > + mmc_hostname(card->host));
> > + err = 0;
> > + } else
> > + card->ext_csd.packed_event_en = 1;
> > + }
> > +
> > if (!oldcard)
> > host->card = card;
> >
> > diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> > index 6e04e10..3ffd93f 100644
> > --- a/include/linux/mmc/card.h
> > +++ b/include/linux/mmc/card.h
> > @@ -52,6 +52,9 @@ struct mmc_ext_csd {
> > u8 part_config;
> > u8 cache_ctrl;
> > u8 rst_n_function;
> > + u8 max_packed_writes;
> > + u8 max_packed_reads;
> > + u8 packed_event_en;
> > unsigned int part_time; /* Units: ms */
> > unsigned int sa_timeout; /* Units: 100ns */
> > unsigned int generic_cmd6_time; /* Units: 10ms */
> > diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> > index a3ac9c4..d2e4210 100644
> > --- a/include/linux/mmc/host.h
> > +++ b/include/linux/mmc/host.h
> > @@ -242,6 +242,7 @@ struct mmc_host {
> > #define MMC_CAP2_CACHE_CTRL (1 << 1) /* Allow cache control */
> > #define MMC_CAP2_POWEROFF_NOTIFY (1 << 2) /* Notify poweroff supported */
> > #define MMC_CAP2_NO_MULTI_READ (1 << 3) /* Multiblock reads don't work */
> > +#define MMC_CAP2_PACKED_CMD (1 << 4) /* Allow packed command */
> >
> > mmc_pm_flag_t pm_caps; /* supported pm features */
> > unsigned int power_notify_type;
> > diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
> > index 0e71356..1988780 100644
> > --- a/include/linux/mmc/mmc.h
> > +++ b/include/linux/mmc/mmc.h
> > @@ -138,6 +138,7 @@ static inline bool mmc_op_multi(u32 opcode)
> > #define R1_CURRENT_STATE(x) ((x & 0x00001E00) >> 9) /* sx, b (4 bits) */
> > #define R1_READY_FOR_DATA (1 << 8) /* sx, a */
> > #define R1_SWITCH_ERROR (1 << 7) /* sx, c */
> > +#define R1_EXP_EVENT (1 << 6) /* sr, a */
> > #define R1_APP_CMD (1 << 5) /* sr, c */
> >
> > #define R1_STATE_IDLE 0
> > @@ -273,6 +274,10 @@ struct _mmc_csd {
> > #define EXT_CSD_FLUSH_CACHE 32 /* W */
> > #define EXT_CSD_CACHE_CTRL 33 /* R/W */
> > #define EXT_CSD_POWER_OFF_NOTIFICATION 34 /* R/W */
> > +#define EXT_CSD_PACKED_FAILURE_INDEX 35 /* RO */
> > +#define EXT_CSD_PACKED_CMD_STATUS 36 /* RO */
> > +#define EXT_CSD_EXP_EVENTS_STATUS 54 /* RO, 2 bytes */
> > +#define EXT_CSD_EXP_EVENTS_CTRL 56 /* R/W, 2 bytes */
> > #define EXT_CSD_GP_SIZE_MULT 143 /* R/W */
> > #define EXT_CSD_PARTITION_ATTRIBUTE 156 /* R/W */
> > #define EXT_CSD_PARTITION_SUPPORT 160 /* RO */
> > @@ -313,6 +318,8 @@ struct _mmc_csd {
> > #define EXT_CSD_POWER_OFF_LONG_TIME 247 /* RO */
> > #define EXT_CSD_GENERIC_CMD6_TIME 248 /* RO */
> > #define EXT_CSD_CACHE_SIZE 249 /* RO, 4 bytes */
> > +#define EXT_CSD_MAX_PACKED_WRITES 500 /* RO */
> > +#define EXT_CSD_MAX_PACKED_READS 501 /* RO */
> > #define EXT_CSD_HPI_FEATURES 503 /* RO */
> >
> > /*
> > @@ -364,6 +371,14 @@ struct _mmc_csd {
> > #define EXT_CSD_PWR_CL_4BIT_MASK 0x0F /* 8 bit PWR CLS */
> > #define EXT_CSD_PWR_CL_8BIT_SHIFT 4
> > #define EXT_CSD_PWR_CL_4BIT_SHIFT 0
> > +
> > +#define EXT_CSD_PACKED_EVENT_EN (1<<3)
> > +
> > +#define EXT_CSD_PACKED_FAILURE (1<<3)
> > +
> > +#define EXT_CSD_PACKED_GENERIC_ERROR (1<<0)
> > +#define EXT_CSD_PACKED_INDEXED_ERROR (1<<1)
> > +
> > /*
> > * MMC_SWITCH access modes
> > */
> > --
> > 1.7.2.3
> >
>
> It'd be helpful if you split this patch into several smaller ones for
> easier review.
> Also please copy linux-kernel mailing list for wider review.
split path... I'll consider it, if possible.
Thank you for review.

Best regards,
Seungwon Jeon.

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