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Date: Fri, 06 Sep 2013 17:05:23 +0900
From: Jaehoon Chung <jh80.chung@...sung.com>
To: undisclosed-recipients:;
Cc: linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: sdhci: add support for pre_req and post_req
Hi, Chanho.
I remembered Shawn Guo had posted this patch.
Do you resend it?
Best Regards,
Jaehoon Chung
On 09/06/2013 03:01 PM, Chanho Min wrote:
> This patch supports non-blocking mmc request function for the sdchi driver.
> (commit: aa8b683a7d392271ed349c6ab9f36b8c313794b7)
>
> pre_req() runs dma_map_sg(), post_req() runs dma_unmap_sg. If not calling
> pre_req() before sdhci_request(), dma_map_sg will be issued before
> starting the transfer. It is optional to use pre_req(). If issuing
> pre_req(), post_req() must be called as well.
>
> benchmark results:
> ARM CA9 1GHz, UHS DDR50 mode
>
> Before:
> dd if=/dev/mmcblk0p15 of=/dev/null bs=64k count=1024
> 67108864 bytes (64.0MB) copied, 1.188846 seconds, 53.8MB/s
>
> After:
> dd if=/dev/mmcblk0p15 of=/dev/null bs=64k count=1024
> 67108864 bytes (64.0MB) copied, 0.993098 seconds, 64.4MB/s
>
> Signed-off-by: Chanho Min <chanho.min@....com>
> ---
> drivers/mmc/host/sdhci.c | 96 +++++++++++++++++++++++++++++++++++++++------
> include/linux/mmc/sdhci.h | 6 +++
> 2 files changed, 90 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 2ea429c..0465a9a 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -465,6 +465,42 @@ static void sdhci_set_adma_desc(u8 *desc, u32 addr, int len, unsigned cmd)
> dataddr[0] = cpu_to_le32(addr);
> }
>
> +static int sdhci_pre_dma_transfer(struct sdhci_host *host,
> + struct mmc_data *data,
> + struct sdhci_next *next)
> +{
> + int sg_count = 0;
> +
> + if (!next && data->host_cookie &&
> + data->host_cookie != host->next_data.cookie) {
> + pr_warn("[%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_READ) ?
> + DMA_FROM_DEVICE :
> + DMA_TO_DEVICE);
> + } else {
> + sg_count = host->next_data.sg_count;
> + host->next_data.sg_count = 0;
> + }
> +
> + 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 int sdhci_adma_table_pre(struct sdhci_host *host,
> struct mmc_data *data)
> {
> @@ -502,8 +538,8 @@ 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);
> + host->sg_count = sdhci_pre_dma_transfer(host, data, NULL);
> +
> if (host->sg_count == 0)
> goto unmap_align;
>
> @@ -643,9 +679,10 @@ 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)
> @@ -824,12 +861,8 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
> }
> } else {
> int sg_cnt;
> + sg_cnt = sdhci_pre_dma_transfer(host, data, NULL);
>
> - 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);
> if (sg_cnt == 0) {
> /*
> * This only happens when someone fed
> @@ -928,9 +961,12 @@ 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);
> + }
> }
> }
>
> @@ -2066,8 +2102,42 @@ static void sdhci_card_event(struct mmc_host *mmc)
> spin_unlock_irqrestore(&host->lock, flags);
> }
>
> +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) {
> + dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
> + (data->flags & MMC_DATA_READ) ?
> + DMA_FROM_DEVICE :
> + DMA_TO_DEVICE);
> + data->host_cookie = 0;
> + }
> +}
> +
> +static void sdhci_pre_req(struct mmc_host *mmc, struct mmc_request *mrq,
> + bool is_first_req)
> +{
> + struct sdhci_host *host = mmc_priv(mmc);
> + struct mmc_data *data = mrq->data;
> +
> + if (mrq->data->host_cookie) {
> + mrq->data->host_cookie = 0;
> + return;
> + }
> +
> + if (host->flags & SDHCI_REQ_USE_DMA) {
> + if (!sdhci_pre_dma_transfer(host, data, &host->next_data))
> + mrq->data->host_cookie = 0;
> + }
> +}
> +
> 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,
> @@ -3204,6 +3274,8 @@ int sdhci_add_host(struct sdhci_host *host)
> }
> #endif
>
> + host->next_data.cookie = 1;
> +
> mmiowb();
>
> mmc_add_host(mmc);
> diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
> index b838ffc..220a515 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_next {
> + unsigned int sg_count;
> + s32 cookie;
> +};
> +
> struct sdhci_host {
> /* Data set by hardware interface driver */
> const char *hw_name; /* Hardware bus name */
> @@ -177,5 +182,6 @@ struct sdhci_host {
> struct timer_list tuning_timer; /* Timer for tuning */
>
> unsigned long private[0] ____cacheline_aligned;
> + struct sdhci_next next_data;
> };
> #endif /* LINUX_MMC_SDHCI_H */
>
--
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