From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753377Ab2AZUwi (ORCPT ); Thu, 26 Jan 2012 15:52:38 -0500 Received: from mail-wi0-f174.google.com ([209.85.212.174]:35334 "EHLO mail-wi0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751958Ab2AZUwg convert rfc822-to-8bit (ORCPT ); Thu, 26 Jan 2012 15:52:36 -0500 MIME-Version: 1.0 In-Reply-To: <002401ccdb20$ad662250$083266f0$%jun@samsung.com> References: <002701ccd728$edab9350$c902b9f0$%jun@samsung.com> <002401ccdb20$ad662250$083266f0$%jun@samsung.com> Date: Fri, 27 Jan 2012 02:22:34 +0530 Message-ID: Subject: Re: [PATCH v3 2/2] mmc: core: Support packed command for eMMC4.5 device From: Saugata Das To: Seungwon Jeon Cc: linux-mmc@vger.kernel.org, Chris Ball , linux-kernel@vger.kernel.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 25 January 2012 10:47, Seungwon Jeon wrote: > Hi, Saugata Das. > > Saugata Das wrote: >> On 20 January 2012 09:36, Seungwon Jeon 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 >> > --- >> >  drivers/mmc/card/block.c   |  469 +++++++++++++++++++++++++++++++++++++++++--- >> >  drivers/mmc/card/queue.c   |   48 +++++- >> >  drivers/mmc/card/queue.h   |   13 ++ >> >  drivers/mmc/core/host.c    |    2 + >> >  drivers/mmc/core/mmc_ops.c |    1 + >> >  include/linux/mmc/core.h   |    3 + >> >  include/linux/mmc/host.h   |    3 + >> >  7 files changed, 512 insertions(+), 27 deletions(-) >> > >> > diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c >> > index 176b78e..77d457e 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); >> > >> >  /* >> > @@ -99,6 +106,7 @@ struct mmc_blk_data { >> >  #define MMC_BLK_WRITE          BIT(1) >> >  #define MMC_BLK_DISCARD                BIT(2) >> >  #define MMC_BLK_SECDISCARD     BIT(3) >> > +#define MMC_BLK_WR_HDR         BIT(4) >> > >> >        /* >> >         * Only set in main mmc_blk_data associated >> > @@ -1028,7 +1036,8 @@ 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); >> > @@ -1053,7 +1062,8 @@ static int mmc_blk_err_check(struct mmc_card *card, >> >                       (unsigned)blk_rq_sectors(req), >> >                       brq->cmd.resp[0], brq->stop.resp[0]); >> > >> > -               if (rq_data_dir(req) == READ) { >> > +               if (rq_data_dir(req) == READ && >> > +                               mq_mrq->packed_cmd != MMC_PACKED_WR_HDR) { >> >                        if (ecc_err) >> >                                return MMC_BLK_ECC_ERR; >> >                        return MMC_BLK_DATA_ERR; >> > @@ -1065,12 +1075,60 @@ 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]; >> > + >> > +       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, >> > @@ -1225,10 +1283,238 @@ 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; >> > + >> > +       mq->mqrq_cur->packed_num = 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; >> > +       } >> >> Is there any reason of not allowing reliable write on packed command ? >> I think, it may get benefit from the packed command since reliable >> writes are typically very small transfer (e.g. meta-data). > In the case where reliable write is requested but enhanced reliable write > is not supported, write access must be partial according to > reliable write sector count. Because even a single request can be split, > packed command is not allowed in this case. Then, can you include the enhanced reliable writes in the packed command ? > >> > + >> > +       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) { >> > +               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; >> > +               return reqs; >> > +       } >> > + >> > +no_packed: >> > +       mq->mqrq_cur->packed_cmd = MMC_PACKED_NONE; >> > +       mq->mqrq_cur->packed_num = 0; >> > +       return 0; >> > +} >> > + >> > +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); >> >> The data tag flag is missed here. I think, we can have a common >> function which sets the CMD23 flags in both >> mmc_blk_packed_hdr_wrq_prep and mmc_blk_rw_rq_prep. This will be >> useful when intergrating the next features (e.g. context id) >> > Oh, you added Data tag feature. I'll apply this next version. > And Adding new function which is related to CMD23 would be good > in different patch not these commit. > >> > +               /* 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; >> > + >> >> We do not need MMC_STOP_TRANSMISSION when we use MMC_SET_BLOCK_COUNT > If transfer is terminated with an error, stop command is required. > MMC_STOP_TRANSMISSION is for this purpose. The mmc_blk_err_check achieves this objective in case of an error. There is no need of this additional command cycle when there is no error. > >> >> > +       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) >> >  { >> > +       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. >> > @@ -1247,13 +1533,65 @@ static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card, >> >                        spin_unlock_irq(&md->lock); >> >                } >> >        } else { >> > -               spin_lock_irq(&md->lock); >> > -               ret = __blk_end_request(req, 0, brq->data.bytes_xfered); >> > -               spin_unlock_irq(&md->lock); >> > +               if (mq_rq->packed_cmd == MMC_PACKED_NONE) { >> > +                       spin_lock_irq(&md->lock); >> > +                       ret = __blk_end_request(req, 0, brq->data.bytes_xfered); >> > +                       spin_unlock_irq(&md->lock); >> > +               } >> >        } >> >        return ret; >> >  } >> > >> > +static int mmc_blk_chk_hdr_err(struct mmc_queue *mq, int status) >> > +{ >> > +       struct mmc_blk_data *md = mq->data; >> > +       struct mmc_card *card = md->queue.card; >> > +       int type = MMC_BLK_WR_HDR, err = 0; >> > + >> > +       switch (status) { >> > +       case MMC_BLK_PARTIAL: >> > +       case MMC_BLK_RETRY: >> > +               err = 0; >> > +               break; >> > +       case MMC_BLK_CMD_ERR: >> > +       case MMC_BLK_ABORT: >> > +       case MMC_BLK_DATA_ERR: >> > +       case MMC_BLK_ECC_ERR: >> > +               err = mmc_blk_reset(md, card->host, type); >> > +               if (!err) >> > +                       mmc_blk_reset_success(md, type); >> > +               break; >> > +       } >> > + >> > +       return err; >> > +} >> > + >> > +static int mmc_blk_issue_packed_rd(struct mmc_queue *mq, >> > +               struct mmc_queue_req *mq_rq) >> > +{ >> > +       struct mmc_blk_data *md = mq->data; >> > +       struct mmc_card *card = md->queue.card; >> > +       int status, ret = -EIO, retry = 2; >> > + >> > +       do { >> > +               mmc_start_req(card->host, NULL, (int *) &status); >> > +               if (status) { >> > +                       ret = mmc_blk_chk_hdr_err(mq, status); >> > +                       if (ret) >> > +                               break; >> > +                       mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq, mq_rq->packed_num); >> > +                       mmc_start_req(card->host, &mq_rq->mmc_active, NULL); >> > +               } else { >> > +                       mmc_blk_packed_rrq_prep(mq_rq, card, mq); >> > +                       mmc_start_req(card->host, &mq_rq->mmc_active, NULL); >> > +                       ret = 0; >> > +                       break; >> > +               } >> > +       } while (retry-- > 0); >> > + >> > +       return ret; >> > +} >> > + >> >  static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc) >> >  { >> >        struct mmc_blk_data *md = mq->data; >> > @@ -1262,21 +1600,32 @@ 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_prep_packed_list(mq, rqc); >> > + >> >        do { >> >                if (rqc) { >> > -                       mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq); >> > +                       if (reqs >= card->host->packed_min) >> > +                               mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur, card, mq, reqs); >> > +                       else >> > +                               mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq); >> >                        areq = &mq->mqrq_cur->mmc_active; >> >                } else >> >                        areq = NULL; >> >                areq = mmc_start_req(card->host, areq, (int *) &status); >> > -               if (!areq) >> > -                       return 0; >> > +               if (!areq) { >> > +                       if (mq->mqrq_cur->packed_cmd == MMC_PACKED_WR_HDR) >> > +                               goto snd_packed_rd; >> >> How the condition, when (areq is not NULL) and >> (mq->mqrq_cur->packed_cmd = MMC_PACKED_WR_HDR) handled ? > That case(areq == NULL && mq->mqrq_cur->packed_cmd == MMC_PACKED_WR_HDR) > will be handled with escape from do~while. > snd_packed_rd: >        if (mq->mqrq_cur->packed_cmd == MMC_PACKED_WR_HDR) { >                if (mmc_blk_issue_packed_rd(mq, mq->mqrq_cur)) >                        goto start_new_req; >        } > >> >> > +                       else >> > +                               return 0; >> > +               } >> > >> >                mq_rq = container_of(areq, struct mmc_queue_req, mmc_active); >> >                brq = &mq_rq->brq; >> > @@ -1291,10 +1640,38 @@ 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); >> > +                                       list_del_init(&prq->queuelist); >> > +                                       if (idx == i) { >> >> I think, in case of no error (packed_fail_idx=0) and when (i=0), this >> above "if" condition will satisfy and subsequently wrongly retry. > packed_failed_idx is '-1' not '0' with no error. > >> >> > +                                               /* retry from error index */ >> > +                                               mq_rq->packed_num -= idx; >> > +                                               if (mq_rq->packed_num == 1) { >> > +                                                       mq_rq->packed_cmd = MMC_PACKED_NONE; >> > +                                                       mq_rq->packed_num = 0; >> > +                                               } >> > +                                               mq_rq->req = prq; >> > +                                               ret = 1; >> > +                                               break; >> > +                                       } >> > +                                       spin_lock_irq(&md->lock); >> > +                                       ret = __blk_end_request(prq, 0, blk_rq_bytes(prq)); >> > +                                       spin_unlock_irq(&md->lock); >> > +                                       i++; >> > +                               } >> > +                               if (idx == -1) >> > +                                       mq_rq->packed_num = 0; >> > +                               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 >> > @@ -1329,6 +1706,8 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc) >> >                                break; >> >                        if (err == -ENODEV) >> >                                goto cmd_abort; >> > +                       if (mq_rq->packed_cmd != MMC_PACKED_NONE) >> > +                               break; >> >                        /* Fall through */ >> >                } >> >                case MMC_BLK_ECC_ERR: >> > @@ -1356,27 +1735,69 @@ 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 { >> > +                               mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq, mq_rq->packed_num); >> > +                               mmc_start_req(card->host, &mq_rq->mmc_active, NULL); >> > +                               if (mq_rq->packed_cmd == MMC_PACKED_WR_HDR) { >> > +                                       if (mmc_blk_issue_packed_rd(mq, mq_rq)) >> > +                                               goto cmd_abort; >> > +                               } >> > +                       } >> >                } >> >        } while (ret); >> > >> > +snd_packed_rd: >> > +       if (mq->mqrq_cur->packed_cmd == MMC_PACKED_WR_HDR) { >> > +               if (mmc_blk_issue_packed_rd(mq, mq->mqrq_cur)) >> > +                       goto start_new_req; >> > +       } >> >        return 1; >> > >> >  cmd_abort: >> > -       spin_lock_irq(&md->lock); >> > -       if (mmc_card_removed(card)) >> > -               req->cmd_flags |= REQ_QUIET; >> > -       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); >> > +               if (mmc_card_removed(card)) >> > +                       req->cmd_flags |= REQ_QUIET; >> > +               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); >> > +                                       spin_lock_irq(mq->queue->queue_lock); >> > +                                       blk_requeue_request(mq->queue, prq); >> > +                                       spin_unlock_irq(mq->queue->queue_lock); >> > +                               } else { >> > +                                       list_del_init(&prq->queuelist); >> > +                               } >> > +                       } >> > +                       mq->mqrq_cur->packed_cmd = MMC_PACKED_NONE; >> > +                       mq->mqrq_cur->packed_num = 0; >> > +               } >> >                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 2517547..af7aee5 100644 >> > --- a/drivers/mmc/card/queue.c >> > +++ b/drivers/mmc/card/queue.c >> > @@ -177,6 +177,8 @@ 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; >> > @@ -377,6 +379,39 @@ 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) { >> >> Why we do not need to handle MMC_PACKED_READ case ? > This conditions is for the packed header. > MMC_PACKED_READ is related with MMC_PACKED_WR_HDR. > > Thanks. > Seungwon Jeon. >> >> > +               __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 >> >  */ >> > @@ -387,12 +422,19 @@ 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..be58b3c 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 +27,12 @@ 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; >> > +       u8              packed_num; >> >  }; >> > >> >  struct mmc_queue { >> > diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c >> > index 30055f2..10350ce 100644 >> > --- a/drivers/mmc/core/host.c >> > +++ b/drivers/mmc/core/host.c >> > @@ -346,6 +346,8 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev) >> >        host->max_blk_size = 512; >> >        host->max_blk_count = PAGE_CACHE_SIZE / 512; >> > >> > +       host->packed_min = 2; >> > + >> >        return host; >> > >> >  free: >> > diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c >> > index 4d41fa9..1e17bd7 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 87a976c..07a4149 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); >> > >> >  #define MMC_ERASE_ARG          0x00000000 >> >  #define MMC_SECURE_ERASE_ARG   0x80000000 >> > diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h >> > index e22f541..8984259 100644 >> > --- a/include/linux/mmc/host.h >> > +++ b/include/linux/mmc/host.h >> > @@ -286,6 +286,9 @@ struct mmc_host { >> >        unsigned int            max_blk_count;  /* maximum number of blocks in one req */ >> >        unsigned int            max_discard_to; /* max. discard timeout in ms */ >> > >> > +       u8                      packed_min;     /* minimum number of packed entries */ >> > + >> > + >> >        /* private data */ >> >        spinlock_t              lock;           /* lock for claim and bus ops */ >> > >> > -- >> > 1.7.0.4 >> > >> > >> > -- >> > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in >> > the body of a message to majordomo@vger.kernel.org >> > 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@vger.kernel.org >> More majordomo info at  http://vger.kernel.org/majordomo-info.html >