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

From: Ulf Hansson
Date: Fri Dec 03 2021 - 09:33:25 EST

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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.

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

Next message: Arnaud POULIQUEN: "Re: [PATCH v2] rpmsg: virtio: don't let virtio core to validate used length"
Previous message: Suzuki K Poulose: "Re: [PATCH] virtio_vring: Fix maximum DMA mapping size computation"
In reply to: Ricky WU: "[PATCH] mmc: rtsx: improve rw performance"
Next in thread: Ricky WU: "RE: [PATCH] mmc: rtsx: improve rw performance"
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