From 6291e7153a173f85bbdb13bf0c72fa11b5d74bc0 Mon Sep 17 00:00:00 2001 From: Micky Ching Date: Fri, 6 Jun 2014 15:05:45 +0800 Subject: [PATCH] mmc: rtsx: add support for async request Add support for non-blocking request, pre_req() runs dma_map_sg() and post_req() runs dma_unmap_sg(). This patch can increase card read/write speed, especially for high speed card and slow speed CPU. Test on intel i3(800MHz - 2.3GHz) performance mode(2.3GHz), SD card clock 208MHz run dd if=/dev/mmcblk0 of=/dev/null bs=64k count=1024 before: 67108864 bytes (67 MB) copied, 0.85427 s, 78.6 MB/s after: 67108864 bytes (67 MB) copied, 0.74799 s, 89.7 MB/s Signed-off-by: Micky Ching Acked-by: Ulf Hansson Signed-off-by: Lee Jones --- drivers/mmc/host/rtsx_pci_sdmmc.c | 133 ++++++++++++++++++++++++++++-- 1 file changed, 127 insertions(+), 6 deletions(-) diff --git a/drivers/mmc/host/rtsx_pci_sdmmc.c b/drivers/mmc/host/rtsx_pci_sdmmc.c index 0d519649b575..dfde4a210238 100644 --- a/drivers/mmc/host/rtsx_pci_sdmmc.c +++ b/drivers/mmc/host/rtsx_pci_sdmmc.c @@ -24,6 +24,7 @@ #include #include #include +#include #include #include #include @@ -36,7 +37,10 @@ struct realtek_pci_sdmmc { struct rtsx_pcr *pcr; struct mmc_host *mmc; struct mmc_request *mrq; + struct workqueue_struct *workq; +#define SDMMC_WORKQ_NAME "rtsx_pci_sdmmc_workq" + struct work_struct work; struct mutex host_mutex; u8 ssc_depth; @@ -48,6 +52,11 @@ struct realtek_pci_sdmmc { int power_state; #define SDMMC_POWER_ON 1 #define SDMMC_POWER_OFF 0 + + unsigned int sg_count; + s32 cookie; + unsigned int cookie_sg_count; + bool using_cookie; }; static inline struct device *sdmmc_dev(struct realtek_pci_sdmmc *host) @@ -86,6 +95,77 @@ static void sd_print_debug_regs(struct realtek_pci_sdmmc *host) #define sd_print_debug_regs(host) #endif /* DEBUG */ +/* + * sd_pre_dma_transfer - do dma_map_sg() or using cookie + * + * @pre: if called in pre_req() + * return: + * 0 - do dma_map_sg() + * 1 - using cookie + */ +static int sd_pre_dma_transfer(struct realtek_pci_sdmmc *host, + struct mmc_data *data, bool pre) +{ + struct rtsx_pcr *pcr = host->pcr; + int read = data->flags & MMC_DATA_READ; + int count = 0; + int using_cookie = 0; + + if (!pre && data->host_cookie && data->host_cookie != host->cookie) { + dev_err(sdmmc_dev(host), + "error: data->host_cookie = %d, host->cookie = %d\n", + data->host_cookie, host->cookie); + data->host_cookie = 0; + } + + if (pre || data->host_cookie != host->cookie) { + count = rtsx_pci_dma_map_sg(pcr, data->sg, data->sg_len, read); + } else { + count = host->cookie_sg_count; + using_cookie = 1; + } + + if (pre) { + host->cookie_sg_count = count; + if (++host->cookie < 0) + host->cookie = 1; + data->host_cookie = host->cookie; + } else { + host->sg_count = count; + } + + return using_cookie; +} + +static void sdmmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq, + bool is_first_req) +{ + struct realtek_pci_sdmmc *host = mmc_priv(mmc); + struct mmc_data *data = mrq->data; + + if (data->host_cookie) { + dev_err(sdmmc_dev(host), + "error: reset data->host_cookie = %d\n", + data->host_cookie); + data->host_cookie = 0; + } + + sd_pre_dma_transfer(host, data, true); + dev_dbg(sdmmc_dev(host), "pre dma sg: %d\n", host->cookie_sg_count); +} + +static void sdmmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq, + int err) +{ + struct realtek_pci_sdmmc *host = mmc_priv(mmc); + struct rtsx_pcr *pcr = host->pcr; + struct mmc_data *data = mrq->data; + int read = data->flags & MMC_DATA_READ; + + rtsx_pci_dma_unmap_sg(pcr, data->sg, data->sg_len, read); + data->host_cookie = 0; +} + static int sd_read_data(struct realtek_pci_sdmmc *host, u8 *cmd, u16 byte_cnt, u8 *buf, int buf_len, int timeout) { @@ -415,7 +495,7 @@ static int sd_rw_multi(struct realtek_pci_sdmmc *host, struct mmc_request *mrq) rtsx_pci_send_cmd_no_wait(pcr); - err = rtsx_pci_transfer_data(pcr, data->sg, data->sg_len, read, 10000); + err = rtsx_pci_dma_transfer(pcr, data->sg, host->sg_count, read, 10000); if (err < 0) { sd_clear_error(host); return err; @@ -640,12 +720,24 @@ static int sd_tuning_rx(struct realtek_pci_sdmmc *host, u8 opcode) return 0; } -static void sdmmc_request(struct mmc_host *mmc, struct mmc_request *mrq) +static inline int sd_rw_cmd(struct mmc_command *cmd) { - struct realtek_pci_sdmmc *host = mmc_priv(mmc); + return mmc_op_multi(cmd->opcode) || + (cmd->opcode == MMC_READ_SINGLE_BLOCK) || + (cmd->opcode == MMC_WRITE_BLOCK); +} + +static void sd_request(struct work_struct *work) +{ + struct realtek_pci_sdmmc *host = container_of(work, + struct realtek_pci_sdmmc, work); struct rtsx_pcr *pcr = host->pcr; + + struct mmc_host *mmc = host->mmc; + struct mmc_request *mrq = host->mrq; struct mmc_command *cmd = mrq->cmd; struct mmc_data *data = mrq->data; + unsigned int data_size = 0; int err; @@ -677,13 +769,13 @@ static void sdmmc_request(struct mmc_host *mmc, struct mmc_request *mrq) if (mrq->data) data_size = data->blocks * data->blksz; - if (!data_size || mmc_op_multi(cmd->opcode) || - (cmd->opcode == MMC_READ_SINGLE_BLOCK) || - (cmd->opcode == MMC_WRITE_BLOCK)) { + if (!data_size || sd_rw_cmd(cmd)) { sd_send_cmd_get_rsp(host, cmd); if (!cmd->error && data_size) { sd_rw_multi(host, mrq); + if (!host->using_cookie) + sdmmc_post_req(host->mmc, host->mrq, 0); if (mmc_op_multi(cmd->opcode) && mrq->stop) sd_send_cmd_get_rsp(host, mrq->stop); @@ -712,6 +804,21 @@ finish: mmc_request_done(mmc, mrq); } +static void sdmmc_request(struct mmc_host *mmc, struct mmc_request *mrq) +{ + struct realtek_pci_sdmmc *host = mmc_priv(mmc); + struct mmc_data *data = mrq->data; + + mutex_lock(&host->host_mutex); + host->mrq = mrq; + mutex_unlock(&host->host_mutex); + + if (sd_rw_cmd(mrq->cmd)) + host->using_cookie = sd_pre_dma_transfer(host, data, false); + + queue_work(host->workq, &host->work); +} + static int sd_set_bus_width(struct realtek_pci_sdmmc *host, unsigned char bus_width) { @@ -1146,6 +1253,8 @@ out: } static const struct mmc_host_ops realtek_pci_sdmmc_ops = { + .pre_req = sdmmc_pre_req, + .post_req = sdmmc_post_req, .request = sdmmc_request, .set_ios = sdmmc_set_ios, .get_ro = sdmmc_get_ro, @@ -1224,10 +1333,16 @@ static int rtsx_pci_sdmmc_drv_probe(struct platform_device *pdev) return -ENOMEM; host = mmc_priv(mmc); + host->workq = create_singlethread_workqueue(SDMMC_WORKQ_NAME); + if (!host->workq) { + mmc_free_host(mmc); + return -ENOMEM; + } host->pcr = pcr; host->mmc = mmc; host->pdev = pdev; host->power_state = SDMMC_POWER_OFF; + INIT_WORK(&host->work, sd_request); 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; @@ -1255,6 +1370,8 @@ static int rtsx_pci_sdmmc_drv_remove(struct platform_device *pdev) pcr->slots[RTSX_SD_CARD].card_event = NULL; mmc = host->mmc; + cancel_work_sync(&host->work); + mutex_lock(&host->host_mutex); if (host->mrq) { dev_dbg(&(pdev->dev), @@ -1273,6 +1390,10 @@ static int rtsx_pci_sdmmc_drv_remove(struct platform_device *pdev) mmc_remove_host(mmc); host->eject = true; + flush_workqueue(host->workq); + destroy_workqueue(host->workq); + host->workq = NULL; + mmc_free_host(mmc); dev_dbg(&(pdev->dev), -- 2.30.2