RE: [PATCH] mmc: rtsx: improve rw performance

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> -----Original Message-----
> From: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
> Sent: Friday, December 3, 2021 10:33 PM
> To: Ricky WU <ricky_wu@xxxxxxxxxxx>
> Cc: gregkh@xxxxxxxxxxxxxxxxxxx; tommyhebb@xxxxxxxxx;
> linux-mmc@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH] mmc: rtsx: improve rw performance
> 
> On Fri, 3 Dec 2021 at 11:43, Ricky WU <ricky_wu@xxxxxxxxxxx> wrote:
> >
> > sd_check_seq() to distinguish sequential rw or normal rw if this data
> > is sequential call to sd_rw_sequential()
> 
> Can you please extend this commit message? This doesn't answer why or what
> this change really does, please try to do that, as to help me to review this.
> 

This patch is for improving sequential read/write performance.
Before this, whether CMD is muti-RW or single-RW the driver do the same flow.
This patch distinguishes the two and do different flow to get more performance
on sequential RW.
sd_check_seq() to distinguish sequential RW (CMD 18/25) or normal RW (CMD 17/24)
if the data is sequential call to sd_rw_sequential()

> Kind regards
> Uffe
> 
> >
> > Signed-off-by: Ricky Wu <ricky_wu@xxxxxxxxxxx>
> > ---
> >  drivers/mmc/host/rtsx_pci_sdmmc.c | 185
> > +++++++++++++++++++++++++++++-
> >  1 file changed, 180 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/mmc/host/rtsx_pci_sdmmc.c
> > b/drivers/mmc/host/rtsx_pci_sdmmc.c
> > index 58cfaffa3c2d..9eb433b1f6f8 100644
> > --- a/drivers/mmc/host/rtsx_pci_sdmmc.c
> > +++ b/drivers/mmc/host/rtsx_pci_sdmmc.c
> > @@ -22,6 +22,8 @@
> >  #include <asm/unaligned.h>
> >  #include <linux/pm_runtime.h>
> >
> > +enum RW_MODE   {NORMAL_RW, SEQ_RW};
> > +
> >  struct realtek_pci_sdmmc {
> >         struct platform_device  *pdev;
> >         struct rtsx_pcr         *pcr;
> > @@ -31,6 +33,7 @@ struct realtek_pci_sdmmc {
> >
> >         struct work_struct      work;
> >         struct mutex            host_mutex;
> > +       struct delayed_work             rw_idle_work;
> >
> >         u8                      ssc_depth;
> >         unsigned int            clock;
> > @@ -46,6 +49,12 @@ struct realtek_pci_sdmmc {
> >         s32                     cookie;
> >         int                     cookie_sg_count;
> >         bool                    using_cookie;
> > +
> > +       enum RW_MODE            rw_mode;
> > +       u8              prev_dir;
> > +       u8              cur_dir;
> > +       u64             prev_sec_addr;
> > +       u32             prev_sec_cnt;
> >  };
> >
> >  static int sdmmc_init_sd_express(struct mmc_host *mmc, struct mmc_ios
> > *ios); @@ -226,6 +235,14 @@ static void sd_send_cmd_get_rsp(struct
> realtek_pci_sdmmc *host,
> >         dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD %d, arg =
> 0x%08x\n",
> >                         __func__, cmd_idx, arg);
> >
> > +       if (cmd_idx == MMC_SEND_STATUS && host->rw_mode ==
> SEQ_RW) {
> > +               cmd->resp[0] = R1_READY_FOR_DATA |
> (R1_STATE_TRAN << 9);
> > +               goto out;
> > +       }
> > +
> > +       if (!mmc_op_multi(cmd->opcode))
> > +               host->rw_mode = NORMAL_RW;
> > +
> >         rsp_type = sd_response_type(cmd);
> >         if (rsp_type < 0)
> >                 goto out;
> > @@ -542,6 +559,93 @@ static int sd_write_long_data(struct
> realtek_pci_sdmmc *host,
> >         return 0;
> >  }
> >
> > +static int sd_rw_sequential(struct realtek_pci_sdmmc *host, struct
> > +mmc_request *mrq) {
> > +       struct rtsx_pcr *pcr = host->pcr;
> > +       struct mmc_host *mmc = host->mmc;
> > +       struct mmc_card *card = mmc->card;
> > +       struct mmc_data *data = mrq->data;
> > +       int uhs = mmc_card_uhs(card);
> > +       u8 cfg2;
> > +       int err;
> > +       size_t data_len = data->blksz * data->blocks;
> > +
> > +       cfg2 = SD_NO_CALCULATE_CRC7 | SD_CHECK_CRC16 |
> > +               SD_NO_WAIT_BUSY_END | SD_NO_CHECK_CRC7 |
> SD_RSP_LEN_0;
> > +
> > +       if (!uhs)
> > +               cfg2 |= SD_NO_CHECK_WAIT_CRC_TO;
> > +
> > +       rtsx_pci_init_cmd(pcr);
> > +       sd_cmd_set_data_len(pcr, data->blocks, data->blksz);
> > +       rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, IRQSTAT0,
> > +                       DMA_DONE_INT, DMA_DONE_INT);
> > +       rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC3,
> > +               0xFF, (u8)(data_len >> 24));
> > +       rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC2,
> > +               0xFF, (u8)(data_len >> 16));
> > +       rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC1,
> > +               0xFF, (u8)(data_len >> 8));
> > +       rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMATC0, 0xFF,
> > + (u8)data_len);
> > +
> > +       if (host->cur_dir == DMA_DIR_FROM_CARD)
> > +               rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMACTL,
> > +                       0x03 | DMA_PACK_SIZE_MASK,
> > +                       DMA_DIR_FROM_CARD | DMA_EN |
> DMA_512);
> > +       else
> > +               rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, DMACTL,
> > +                       0x03 | DMA_PACK_SIZE_MASK,
> > +                       DMA_DIR_TO_CARD | DMA_EN | DMA_512);
> > +
> > +       rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_DATA_SOURCE,
> > +                       0x01, RING_BUFFER);
> > +       rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_CFG2, 0xFF, cfg2);
> > +
> > +       if (host->cur_dir == DMA_DIR_FROM_CARD)
> > +               rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_TRANSFER,
> 0xFF,
> > +                               SD_TRANSFER_START |
> SD_TM_AUTO_READ_3);
> > +       else
> > +               rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_TRANSFER,
> 0xFF,
> > +                               SD_TRANSFER_START |
> > + SD_TM_AUTO_WRITE_3);
> > +
> > +       rtsx_pci_add_cmd(pcr, CHECK_REG_CMD, SD_TRANSFER,
> > +                       SD_TRANSFER_END, SD_TRANSFER_END);
> > +       rtsx_pci_send_cmd_no_wait(pcr);
> > +
> > +       if (host->cur_dir == DMA_DIR_FROM_CARD)
> > +               err = rtsx_pci_dma_transfer(pcr, data->sg,
> host->sg_count, 1, 10000);
> > +       else
> > +               err = rtsx_pci_dma_transfer(pcr, data->sg,
> > + host->sg_count, 0, 10000);
> > +
> > +       if (err < 0) {
> > +               sd_clear_error(host);
> > +               return err;
> > +       }
> > +
> > +       return 0;
> > +}
> > +
> > +static int sd_stop_sequential(struct realtek_pci_sdmmc *host, struct
> > +mmc_request *mrq) {
> > +       struct rtsx_pcr *pcr = host->pcr;
> > +       struct mmc_command *cmd;
> > +
> > +       cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
> > +
> > +       cmd->opcode = MMC_STOP_TRANSMISSION;
> > +       cmd->arg = 0;
> > +       cmd->busy_timeout = 0;
> > +       if (host->cur_dir == DMA_DIR_FROM_CARD)
> > +               cmd->flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
> MMC_CMD_AC;
> > +       else
> > +               cmd->flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
> MMC_CMD_AC;
> > +       sd_send_cmd_get_rsp(host, cmd);
> > +       udelay(50);
> > +       rtsx_pci_write_register(pcr, RBCTL, RB_FLUSH, RB_FLUSH);
> > +       kfree(cmd);
> > +       return 0;
> > +}
> > +
> >  static inline void sd_enable_initial_mode(struct realtek_pci_sdmmc
> > *host)  {
> >         rtsx_pci_write_register(host->pcr, SD_CFG1, @@ -796,6 +900,45
> > @@ static inline int sd_rw_cmd(struct mmc_command *cmd)
> >                 (cmd->opcode == MMC_WRITE_BLOCK);  }
> >
> > +static void sd_rw_idle_work(struct work_struct *work) {
> > +       struct delayed_work *dwork = to_delayed_work(work);
> > +       struct realtek_pci_sdmmc *host = container_of(dwork,
> > +                       struct realtek_pci_sdmmc, rw_idle_work);
> > +       struct mmc_command *cmd;
> > +
> > +       cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
> > +
> > +       cmd->opcode = MMC_STOP_TRANSMISSION;
> > +       cmd->arg = 0;
> > +       cmd->busy_timeout = 0;
> > +       if (host->cur_dir == DMA_DIR_FROM_CARD)
> > +               cmd->flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
> MMC_CMD_AC;
> > +       else
> > +               cmd->flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
> > + MMC_CMD_AC;
> > +
> > +       sd_send_cmd_get_rsp(host, cmd);
> > +       host->rw_mode = NORMAL_RW;
> > +       kfree(cmd);
> > +}
> > +
> > +static int sd_check_seq(struct realtek_pci_sdmmc *host, struct
> > +mmc_request *mrq) {
> > +       struct mmc_command *cmd = mrq->cmd;
> > +       struct mmc_data *data = mrq->data;
> > +
> > +       if (!mmc_op_multi(cmd->opcode))
> > +               return 0;
> > +
> > +       if (host->prev_dir != host->cur_dir)
> > +               return 0;
> > +
> > +       if ((host->prev_sec_addr + host->prev_sec_cnt) != data->blk_addr)
> > +               return 0;
> > +
> > +       return 1;
> > +}
> > +
> >  static void sd_request(struct work_struct *work)  {
> >         struct realtek_pci_sdmmc *host = container_of(work, @@ -841,12
> > +984,36 @@ static void sd_request(struct work_struct *work)
> >         if (!data_size) {
> >                 sd_send_cmd_get_rsp(host, cmd);
> >         } else if (sd_rw_cmd(cmd) || sdio_extblock_cmd(cmd, data)) {
> > -               cmd->error = sd_rw_multi(host, mrq);
> > -               if (!host->using_cookie)
> > -                       sdmmc_post_req(host->mmc, host->mrq, 0);
> > +               /* Check seq function*/
> > +               if (data->flags & MMC_DATA_READ)
> > +                       host->cur_dir = DMA_DIR_FROM_CARD;
> > +               else
> > +                       host->cur_dir = DMA_DIR_TO_CARD;
> > +
> > +               if (host->rw_mode == SEQ_RW) {
> > +                       cancel_delayed_work(&host->rw_idle_work);
> > +                       if (!sd_check_seq(host, mrq)) {
> > +                               sd_stop_sequential(host, mrq);
> > +                               host->rw_mode = NORMAL_RW;
> > +                       }
> > +               }
> > +
> > +               if (host->rw_mode == SEQ_RW)
> > +                       cmd->error = sd_rw_sequential(host, mrq);
> > +               else {
> > +                       if (mmc_op_multi(cmd->opcode))
> > +                               host->rw_mode = SEQ_RW;
> > +                       cmd->error = sd_rw_multi(host, mrq);
> > +                       if (!host->using_cookie)
> > +                               sdmmc_post_req(host->mmc,
> host->mrq, 0);
> > +               }
> > +
> > +               if (cmd->error)
> > +                       host->rw_mode = NORMAL_RW;
> > +
> > +               if (mmc_op_multi(cmd->opcode) && host->rw_mode ==
> SEQ_RW)
> > +                       mod_delayed_work(system_wq,
> > + &host->rw_idle_work, msecs_to_jiffies(150));
> >
> > -               if (mmc_op_multi(cmd->opcode) && mrq->stop)
> > -                       sd_send_cmd_get_rsp(host, mrq->stop);
> >         } else {
> >                 sd_normal_rw(host, mrq);
> >         }
> > @@ -867,6 +1034,11 @@ static void sd_request(struct work_struct *work)
> >         }
> >
> >         mutex_lock(&host->host_mutex);
> > +       if (sd_rw_cmd(cmd) || sdio_extblock_cmd(cmd, data)) {
> > +               host->prev_dir = host->cur_dir;
> > +               host->prev_sec_addr = data->blk_addr;
> > +               host->prev_sec_cnt = data->blocks;
> > +       }
> >         host->mrq = NULL;
> >         mutex_unlock(&host->host_mutex);
> >
> > @@ -1457,6 +1629,7 @@ static void rtsx_pci_sdmmc_card_event(struct
> platform_device *pdev)
> >         struct realtek_pci_sdmmc *host = platform_get_drvdata(pdev);
> >
> >         host->cookie = -1;
> > +       host->rw_mode = NORMAL_RW;
> >         mmc_detect_change(host->mmc, 0);  }
> >
> > @@ -1487,6 +1660,7 @@ static int rtsx_pci_sdmmc_drv_probe(struct
> platform_device *pdev)
> >         host->cookie = -1;
> >         host->power_state = SDMMC_POWER_OFF;
> >         INIT_WORK(&host->work, sd_request);
> > +       INIT_DELAYED_WORK(&host->rw_idle_work, sd_rw_idle_work);
> >         platform_set_drvdata(pdev, host);
> >         pcr->slots[RTSX_SD_CARD].p_dev = pdev;
> >         pcr->slots[RTSX_SD_CARD].card_event =
> > rtsx_pci_sdmmc_card_event; @@ -1526,6 +1700,7 @@ static int
> rtsx_pci_sdmmc_drv_remove(struct platform_device *pdev)
> >                 pm_runtime_disable(&pdev->dev);
> >         }
> >
> > +       cancel_delayed_work_sync(&host->rw_idle_work);
> >         cancel_work_sync(&host->work);
> >
> >         mutex_lock(&host->host_mutex);
> > --
> > 2.25.1
> ------Please consider the environment before printing this e-mail.




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