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Message-ID: <241c5b1d-de4a-5127-461f-8b885cca1668@allwinnertech.com>
Date: Tue, 31 Jan 2023 21:10:08 +0800
From: Michael Wu <michael@...winnertech.com>
To: Wenchao Chen <wenchao.chen666@...il.com>
Cc: adrian.hunter@...el.com, riteshh@...eaurora.org,
asutoshd@...eaurora.org, ulf.hansson@...aro.org,
chaotian.jing@...iatek.com, matthias.bgg@...il.com,
kdasu.kdev@...il.com, alcooperx@...il.com, f.fainelli@...il.com,
haibo.chen@....com, shawnguo@...nel.org, agross@...nel.org,
andersson@...nel.org, michal.simek@...inx.com,
thierry.reding@...il.com, jonathanh@...dia.com,
bcm-kernel-feedback-list@...adcom.com, kernel@...gutronix.de,
festevam@...il.com, linux-imx@....com, konrad.dybcio@...aro.org,
linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
linux-tegra@...r.kernel.org
Subject: Re: [PATCH] mmc:mmc-cqhci:support interrupt coalescing
Dear Wenchao，
At present, I am working on the hook function .cqe_enable that the
ICCTH of CQIC is set, and it work well in my test. Actually I want to
confirm why the community does not support this feature. I think it is
necessary to reduce the number of interrupts caused by IO and reducing
interrupt context switching.
On 2023/1/31 11:09, Wenchao Chen wrote:
> On Mon, Jan 30, 2023 at 2:49 PM Michael Wu <michael@...winnertech.com> wrote:
>>
>> Support interrupt coalescing to reduce the frequency of mmc interrupts
>>
>
> Hi Michael
> The CQIS register does not have any configuration.
> Usually ICCTH needs to be enabled.
>
>> Signed-off-by: Michael Wu <michael@...winnertech.com>
>> ---
>> drivers/mmc/host/cqhci-core.c | 20 +++++++++++++++-----
>> drivers/mmc/host/cqhci.h | 5 ++++-
>> drivers/mmc/host/mtk-sd.c | 2 +-
>> drivers/mmc/host/sdhci-brcmstb.c | 2 +-
>> drivers/mmc/host/sdhci-esdhc-imx.c | 2 +-
>> drivers/mmc/host/sdhci-msm.c | 2 +-
>> drivers/mmc/host/sdhci-of-arasan.c | 2 +-
>> drivers/mmc/host/sdhci-pci-core.c | 2 +-
>> drivers/mmc/host/sdhci-pci-gli.c | 2 +-
>> drivers/mmc/host/sdhci-tegra.c | 2 +-
>> drivers/mmc/host/sdhci_am654.c | 2 +-
>> 11 files changed, 28 insertions(+), 15 deletions(-)
>>
>> diff --git a/drivers/mmc/host/cqhci-core.c b/drivers/mmc/host/cqhci-core.c
>> index b3d7d6d8d654..f9cdf9f04bfc 100644
>> --- a/drivers/mmc/host/cqhci-core.c
>> +++ b/drivers/mmc/host/cqhci-core.c
>> @@ -420,7 +420,7 @@ static void cqhci_disable(struct mmc_host *mmc)
>> }
>>
>> static void cqhci_prep_task_desc(struct mmc_request *mrq,
>> - struct cqhci_host *cq_host, int tag)
>> + struct cqhci_host *cq_host, int tag, int intr)
>> {
>> __le64 *task_desc = (__le64 __force *)get_desc(cq_host, tag);
>> u32 req_flags = mrq->data->flags;
>> @@ -428,7 +428,7 @@ static void cqhci_prep_task_desc(struct mmc_request *mrq,
>>
>> desc0 = CQHCI_VALID(1) |
>> CQHCI_END(1) |
>> - CQHCI_INT(1) |
>> + CQHCI_INT(intr) |
>> CQHCI_ACT(0x5) |
>> CQHCI_FORCED_PROG(!!(req_flags & MMC_DATA_FORCED_PRG)) |
>> CQHCI_DATA_TAG(!!(req_flags & MMC_DATA_DAT_TAG)) |
>> @@ -621,7 +621,7 @@ static int cqhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
>> }
>>
>> if (mrq->data) {
>> - cqhci_prep_task_desc(mrq, cq_host, tag);
>> + cqhci_prep_task_desc(mrq, cq_host, tag, (cq_host->intr_clsc ? 0 : 1));
>>
>> err = cqhci_prep_tran_desc(mrq, cq_host, tag);
>> if (err) {
>> @@ -812,7 +812,7 @@ static void cqhci_finish_mrq(struct mmc_host *mmc, unsigned int tag)
>> irqreturn_t cqhci_irq(struct mmc_host *mmc, u32 intmask, int cmd_error,
>> int data_error)
>> {
>> - u32 status;
>> + u32 status, rval;
>> unsigned long tag = 0, comp_status;
>> struct cqhci_host *cq_host = mmc->cqe_private;
>>
>> @@ -856,6 +856,15 @@ irqreturn_t cqhci_irq(struct mmc_host *mmc, u32 intmask, int cmd_error,
>> spin_unlock(&cq_host->lock);
>> }
>>
>> + if (cq_host->intr_clsc) {
>> + rval = cqhci_readl(cq_host, CQHCI_IC);
>> + rval |= CQHCI_IC_RESET;
>> + cqhci_writel(cq_host, rval, CQHCI_IC);
>> + rval = cqhci_readl(cq_host, CQHCI_IC);
>> + rval &= (~CQHCI_IC_RESET);
>> + cqhci_writel(cq_host, rval, CQHCI_IC);
>> + }
>> +
>> if (status & CQHCI_IS_TCL)
>> wake_up(&cq_host->wait_queue);
>>
>> @@ -1172,11 +1181,12 @@ static unsigned int cqhci_ver_minor(struct cqhci_host *cq_host)
>> }
>>
>> int cqhci_init(struct cqhci_host *cq_host, struct mmc_host *mmc,
>> - bool dma64)
>> + bool dma64, bool intr_clsc)
>> {
>> int err;
>>
>> cq_host->dma64 = dma64;
>> + cq_host->intr_clsc = intr_clsc;
>> cq_host->mmc = mmc;
>> cq_host->mmc->cqe_private = cq_host;
>>
>> diff --git a/drivers/mmc/host/cqhci.h b/drivers/mmc/host/cqhci.h
>> index ba9387ed90eb..acf90773c30a 100644
>> --- a/drivers/mmc/host/cqhci.h
>> +++ b/drivers/mmc/host/cqhci.h
>> @@ -227,6 +227,9 @@ struct cqhci_host {
>>
>> /* 64 bit DMA */
>> bool dma64;
>> +
>> + /* interrupt coalescing*/
>> + bool intr_clsc;
>> int num_slots;
>> int qcnt;
>>
>> @@ -312,7 +315,7 @@ struct platform_device;
>>
>> irqreturn_t cqhci_irq(struct mmc_host *mmc, u32 intmask, int cmd_error,
>> int data_error);
>> -int cqhci_init(struct cqhci_host *cq_host, struct mmc_host *mmc, bool dma64);
>> +int cqhci_init(struct cqhci_host *cq_host, struct mmc_host *mmc, bool dma64, bool intr_clsc);
>> struct cqhci_host *cqhci_pltfm_init(struct platform_device *pdev);
>> int cqhci_deactivate(struct mmc_host *mmc);
>> static inline int cqhci_suspend(struct mmc_host *mmc)
>> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
>> index edade0e54a0c..2c18f954d4b8 100644
>> --- a/drivers/mmc/host/mtk-sd.c
>> +++ b/drivers/mmc/host/mtk-sd.c
>> @@ -2796,7 +2796,7 @@ static int msdc_drv_probe(struct platform_device *pdev)
>> host->cq_host->caps |= CQHCI_TASK_DESC_SZ_128;
>> host->cq_host->mmio = host->base + 0x800;
>> host->cq_host->ops = &msdc_cmdq_ops;
>> - ret = cqhci_init(host->cq_host, mmc, true);
>> + ret = cqhci_init(host->cq_host, mmc, true, false);
>> if (ret)
>> goto host_free;
>> mmc->max_segs = 128;
>> diff --git a/drivers/mmc/host/sdhci-brcmstb.c b/drivers/mmc/host/sdhci-brcmstb.c
>> index f2cf3d70db79..4aeaeddbbf25 100644
>> --- a/drivers/mmc/host/sdhci-brcmstb.c
>> +++ b/drivers/mmc/host/sdhci-brcmstb.c
>> @@ -231,7 +231,7 @@ static int sdhci_brcmstb_add_host(struct sdhci_host *host,
>> cq_host->caps |= CQHCI_TASK_DESC_SZ_128;
>> }
>>
>> - ret = cqhci_init(cq_host, host->mmc, dma64);
>> + ret = cqhci_init(cq_host, host->mmc, dma64, false);
>> if (ret)
>> goto cleanup;
>>
>> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
>> index 9e73c34b6401..7aef7abe71f1 100644
>> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
>> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
>> @@ -1712,7 +1712,7 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
>> cq_host->mmio = host->ioaddr + ESDHC_CQHCI_ADDR_OFFSET;
>> cq_host->ops = &esdhc_cqhci_ops;
>>
>> - err = cqhci_init(cq_host, host->mmc, false);
>> + err = cqhci_init(cq_host, host->mmc, false, false);
>> if (err)
>> goto disable_ahb_clk;
>> }
>> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
>> index 4ac8651d0b29..b6549d1e43ec 100644
>> --- a/drivers/mmc/host/sdhci-msm.c
>> +++ b/drivers/mmc/host/sdhci-msm.c
>> @@ -2153,7 +2153,7 @@ static int sdhci_msm_cqe_add_host(struct sdhci_host *host,
>> if (ret)
>> goto cleanup;
>>
>> - ret = cqhci_init(cq_host, host->mmc, dma64);
>> + ret = cqhci_init(cq_host, host->mmc, dma64, false);
>> if (ret) {
>> dev_err(&pdev->dev, "%s: CQE init: failed (%d)\n",
>> mmc_hostname(host->mmc), ret);
>> diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
>> index 89c431a34c43..811f8686532d 100644
>> --- a/drivers/mmc/host/sdhci-of-arasan.c
>> +++ b/drivers/mmc/host/sdhci-of-arasan.c
>> @@ -1610,7 +1610,7 @@ static int sdhci_arasan_add_host(struct sdhci_arasan_data *sdhci_arasan)
>> if (dma64)
>> cq_host->caps |= CQHCI_TASK_DESC_SZ_128;
>>
>> - ret = cqhci_init(cq_host, host->mmc, dma64);
>> + ret = cqhci_init(cq_host, host->mmc, dma64, false);
>> if (ret)
>> goto cleanup;
>>
>> diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
>> index c359f867df0a..6f6cae6355a7 100644
>> --- a/drivers/mmc/host/sdhci-pci-core.c
>> +++ b/drivers/mmc/host/sdhci-pci-core.c
>> @@ -964,7 +964,7 @@ static int glk_emmc_add_host(struct sdhci_pci_slot *slot)
>> if (dma64)
>> cq_host->caps |= CQHCI_TASK_DESC_SZ_128;
>>
>> - ret = cqhci_init(cq_host, host->mmc, dma64);
>> + ret = cqhci_init(cq_host, host->mmc, dma64, false);
>> if (ret)
>> goto cleanup;
>>
>> diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
>> index 633a8ee8f8c5..6917ba339aa9 100644
>> --- a/drivers/mmc/host/sdhci-pci-gli.c
>> +++ b/drivers/mmc/host/sdhci-pci-gli.c
>> @@ -908,7 +908,7 @@ static int gl9763e_add_host(struct sdhci_pci_slot *slot)
>> if (dma64)
>> cq_host->caps |= CQHCI_TASK_DESC_SZ_128;
>>
>> - ret = cqhci_init(cq_host, host->mmc, dma64);
>> + ret = cqhci_init(cq_host, host->mmc, dma64, false);
>> if (ret)
>> goto cleanup;
>>
>> diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
>> index bff084f178c9..f98a468e8f43 100644
>> --- a/drivers/mmc/host/sdhci-tegra.c
>> +++ b/drivers/mmc/host/sdhci-tegra.c
>> @@ -1620,7 +1620,7 @@ static int sdhci_tegra_add_host(struct sdhci_host *host)
>> if (dma64)
>> cq_host->caps |= CQHCI_TASK_DESC_SZ_128;
>>
>> - ret = cqhci_init(cq_host, host->mmc, dma64);
>> + ret = cqhci_init(cq_host, host->mmc, dma64, false);
>> if (ret)
>> goto cleanup;
>>
>> diff --git a/drivers/mmc/host/sdhci_am654.c b/drivers/mmc/host/sdhci_am654.c
>> index 7ef828942df3..8e7fbee70e16 100644
>> --- a/drivers/mmc/host/sdhci_am654.c
>> +++ b/drivers/mmc/host/sdhci_am654.c
>> @@ -568,7 +568,7 @@ static int sdhci_am654_cqe_add_host(struct sdhci_host *host)
>>
>> host->mmc->caps2 |= MMC_CAP2_CQE;
>>
>> - return cqhci_init(cq_host, host->mmc, 1);
>> + return cqhci_init(cq_host, host->mmc, 1, false);
>> }
>>
>> static int sdhci_am654_get_otap_delay(struct sdhci_host *host,
>> --
>> 2.29.0
>>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
--
Regards,
Michael Wu
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