On Tue, Dec 9, 2014 at 5:04 PM, Haibo Chen <haibo.chen@xxxxxxxxxxxxx> wrote:
> This patch is based on the patches by Per Forlin, Tony Lin and Ryan QIAN.
>
> This patch complete the API 'post_req' and 'pre_req' in sdhci host side,
>
> Test Env:
> 1. i.MX6Q-SABREAUTO board, CPU @ 996MHz, use ADMA in uSDHC controller.
> 2. Test command:
> $ echo 1 > /proc/sys/vm/drop_caches
> write to sd card:
> $ dd if=/dev/zero of=/dev/mmcblk0 bs=1M count=2000 conv=fsync
> read the sd card:
> $ dd if=/dev/mmcblk0 of=/dev/null bs=1M count=2000
>
> 3. TOSHIBA 16GB SD3.0 card, running at 4 bit, SDR104 @ 198MHZ
> Performance with and without this patch:
> -------------------------------------------------
> | | read speed | write speed |
> |------------------------------------------------
> | with this patch | ~76.7 MB/s | ~23.3 MB/s |
> |------------------------------------------------
> |without this patch | ~60.5 MB/s | ~22.5 MB/s |
> -------------------------------------------------
>
> 4. SanDisk 8GB SD3.0 card, running at 4 bit, DDR50 @ 50MHZ
> Performance with and without this patch:
> -------------------------------------------------
> | | read speed | write speed |
> |------------------------------------------------
> | with this patch | ~40.5 MB/s | ~15.6 MB/s |
> |------------------------------------------------
> |without this patch | ~36.1 MB/s | ~14.1 MB/s |
> -------------------------------------------------
>
> 5. Kingston 8GB SD2.0 card, running at 4 bit, High-speed @ 50MHZ
> Performance with and without this patch:
> -------------------------------------------------
> | | read speed | write speed |
> |------------------------------------------------
> | with this patch | ~22.7 MB/s | ~8.2 MB/s |
> |------------------------------------------------
> |without this patch | ~21.3 MB/s | ~8.0 MB/s |
> -------------------------------------------------
>
> 6. About eMMC, Sandisk 8GB eMMC on i.MX6DL-sabresd board, CPU @ 792MHZ,
> eMMC running at 8 bit, DDR52 @ 52MHZ.
> Performance with and without this patch:
> -------------------------------------------------
> | | read speed | write speed |
> |------------------------------------------------
> | with this patch | ~37.3 MB/s | ~10.5 MB/s |
> |------------------------------------------------
> |without this patch | ~33.4 MB/s | ~10.5 MB/s |
> -------------------------------------------------
>
> Signed-off-by: Haibo Chen <haibo.chen@xxxxxxxxxxxxx>
Can someone else test and see if can get the same performance improvement?
Regards
Dong Aisheng
> ---
> drivers/mmc/host/sdhci.c | 100 ++++++++++++++++++++++++++++++++++++++++------
> include/linux/mmc/sdhci.h | 6 +++
> 2 files changed, 94 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index ada1a3e..50f8a4f 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -55,6 +55,9 @@ static void sdhci_finish_command(struct sdhci_host *);
> static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode);
> static void sdhci_tuning_timer(unsigned long data);
> static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable);
> +static int sdhci_pre_dma_transfer(struct sdhci_host *host,
> + struct mmc_data *data,
> + struct sdhci_host_next *next);
>
> #ifdef CONFIG_PM_RUNTIME
> static int sdhci_runtime_pm_get(struct sdhci_host *host);
> @@ -494,9 +497,8 @@ static int sdhci_adma_table_pre(struct sdhci_host *host,
> goto fail;
> BUG_ON(host->align_addr & 0x3);
>
> - host->sg_count = dma_map_sg(mmc_dev(host->mmc),
> - data->sg, data->sg_len, direction);
> - if (host->sg_count == 0)
> + host->sg_count = sdhci_pre_dma_transfer(host, data, NULL);
> + if (host->sg_count < 0)
> goto unmap_align;
>
> desc = host->adma_desc;
> @@ -633,8 +635,9 @@ static void sdhci_adma_table_post(struct sdhci_host *host,
> }
> }
>
> - dma_unmap_sg(mmc_dev(host->mmc), data->sg,
> - data->sg_len, direction);
> + if (!data->host_cookie)
> + dma_unmap_sg(mmc_dev(host->mmc), data->sg,
> + data->sg_len, direction);
> }
>
> static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd)
> @@ -826,11 +829,7 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
> } else {
> int sg_cnt;
>
> - sg_cnt = dma_map_sg(mmc_dev(host->mmc),
> - data->sg, data->sg_len,
> - (data->flags & MMC_DATA_READ) ?
> - DMA_FROM_DEVICE :
> - DMA_TO_DEVICE);
> + sg_cnt = sdhci_pre_dma_transfer(host, data, NULL);
> if (sg_cnt == 0) {
> /*
> * This only happens when someone fed
> @@ -934,8 +933,10 @@ static void sdhci_finish_data(struct sdhci_host *host)
> if (host->flags & SDHCI_USE_ADMA)
> sdhci_adma_table_post(host, data);
> else {
> - dma_unmap_sg(mmc_dev(host->mmc), data->sg,
> - data->sg_len, (data->flags & MMC_DATA_READ) ?
> + if (!data->host_cookie)
> + dma_unmap_sg(mmc_dev(host->mmc),
> + data->sg, data->sg_len,
> + (data->flags & MMC_DATA_READ) ?
> DMA_FROM_DEVICE : DMA_TO_DEVICE);
> }
> }
> @@ -2068,6 +2069,78 @@ static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
> }
> }
>
> +static void sdhci_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
> + int err)
> +{
> + struct sdhci_host *host = mmc_priv(mmc);
> + struct mmc_data *data = mrq->data;
> +
> + if (host->flags & SDHCI_REQ_USE_DMA) {
> + if (data->host_cookie)
> + dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
> + data->flags & MMC_DATA_WRITE ?
> + DMA_TO_DEVICE : DMA_FROM_DEVICE);
> + mrq->data->host_cookie = 0;
> + }
> +}
> +
> +static int sdhci_pre_dma_transfer(struct sdhci_host *host,
> + struct mmc_data *data,
> + struct sdhci_host_next *next)
> +{
> + int sg_count;
> +
> + if (!next && data->host_cookie &&
> + data->host_cookie != host->next_data.cookie) {
> + pr_debug(DRIVER_NAME "[%s] invalid cookie: data->host_cookie %d"
> + " host->next_data.cookie %d\n",
> + __func__, data->host_cookie, host->next_data.cookie);
> + data->host_cookie = 0;
> + }
> +
> + /* Check if next job is already prepared */
> + if (next ||
> + (!next && data->host_cookie != host->next_data.cookie)) {
> + sg_count = dma_map_sg(mmc_dev(host->mmc), data->sg,
> + data->sg_len,
> + data->flags & MMC_DATA_WRITE ?
> + DMA_TO_DEVICE : DMA_FROM_DEVICE);
> +
> + } else {
> + sg_count = host->next_data.sg_count;
> + host->next_data.sg_count = 0;
> + }
> +
> +
> + if (sg_count == 0)
> + return -EINVAL;
> +
> + if (next) {
> + next->sg_count = sg_count;
> + data->host_cookie = ++next->cookie < 0 ? 1 : next->cookie;
> + } else
> + host->sg_count = sg_count;
> +
> + return sg_count;
> +}
> +
> +static void sdhci_pre_req(struct mmc_host *mmc, struct mmc_request *mrq,
> + bool is_first_req)
> +{
> + struct sdhci_host *host = mmc_priv(mmc);
> +
> + if (mrq->data->host_cookie) {
> + mrq->data->host_cookie = 0;
> + return;
> + }
> +
> + if (host->flags & SDHCI_REQ_USE_DMA)
> + if (sdhci_pre_dma_transfer(host,
> + mrq->data,
> + &host->next_data) < 0)
> + mrq->data->host_cookie = 0;
> +}
> +
> static void sdhci_card_event(struct mmc_host *mmc)
> {
> struct sdhci_host *host = mmc_priv(mmc);
> @@ -2098,6 +2171,8 @@ static void sdhci_card_event(struct mmc_host *mmc)
>
> static const struct mmc_host_ops sdhci_ops = {
> .request = sdhci_request,
> + .post_req = sdhci_post_req,
> + .pre_req = sdhci_pre_req,
> .set_ios = sdhci_set_ios,
> .get_cd = sdhci_get_cd,
> .get_ro = sdhci_get_ro,
> @@ -2919,6 +2994,7 @@ int sdhci_add_host(struct sdhci_host *host)
> host->max_clk = host->ops->get_max_clock(host);
> }
>
> + host->next_data.cookie = 1;
> /*
> * In case of Host Controller v3.00, find out whether clock
> * multiplier is supported.
> diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
> index dba793e..47b5d82 100644
> --- a/include/linux/mmc/sdhci.h
> +++ b/include/linux/mmc/sdhci.h
> @@ -17,6 +17,11 @@
> #include <linux/io.h>
> #include <linux/mmc/host.h>
>
> +struct sdhci_host_next {
> + unsigned int sg_count;
> + s32 cookie;
> +};
> +
> struct sdhci_host {
> /* Data set by hardware interface driver */
> const char *hw_name; /* Hardware bus name */
> @@ -188,6 +193,7 @@ struct sdhci_host {
> #define SDHCI_TUNING_MODE_1 0
> struct timer_list tuning_timer; /* Timer for tuning */
>
> + struct sdhci_host_next next_data;
> unsigned long private[0] ____cacheline_aligned;
> };
> #endif /* LINUX_MMC_SDHCI_H */
> --
> 1.9.1
>
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