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Date: Wed, 30 Jun 2021 15:21:55 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Renius Chen <reniuschengl@...il.com>, ulf.hansson@...aro.org
Cc: linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
Ben.Chuang@...esyslogic.com.tw
Subject: Re: [PATCH] [RESEND] mmc: sdhci-pci-gli: Improve Random 4K Read
Performance of GL9763E
On 30/06/21 3:18 pm, Adrian Hunter wrote:
> On 24/06/21 6:25 am, Renius Chen wrote:
>> During a sequence of random 4K read operations, the performance will be
>> reduced due to spending much time on entering/exiting the low power state
>> between requests. We disable the low power state negotiation of GL9763E
>> during a sequence of random 4K read operations to improve the performance
>> and enable it again after the operations have finished.
>>
>> Signed-off-by: Renius Chen <reniuschengl@...il.com>
>> ---
>> drivers/mmc/host/sdhci-pci-gli.c | 86 ++++++++++++++++++++++++++++++++
>> 1 file changed, 86 insertions(+)
>>
>> diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
>> index 302a7579a9b3..0105f728ccc4 100644
>> --- a/drivers/mmc/host/sdhci-pci-gli.c
>> +++ b/drivers/mmc/host/sdhci-pci-gli.c
>> @@ -88,6 +88,9 @@
>> #define PCIE_GLI_9763E_SCR 0x8E0
>> #define GLI_9763E_SCR_AXI_REQ BIT(9)
>>
>> +#define PCIE_GLI_9763E_CFG 0x8A0
>> +#define GLI_9763E_CFG_LPSN_DIS BIT(12)
>> +
>> #define PCIE_GLI_9763E_CFG2 0x8A4
>> #define GLI_9763E_CFG2_L1DLY GENMASK(28, 19)
>> #define GLI_9763E_CFG2_L1DLY_MID 0x54
>> @@ -691,6 +694,86 @@ static void sdhci_gl9763e_dumpregs(struct mmc_host *mmc)
>> sdhci_dumpregs(mmc_priv(mmc));
>> }
>>
>> +static void gl9763e_request(struct mmc_host *mmc, struct mmc_request *mrq)
>> +{
>> + struct sdhci_host *host = mmc_priv(mmc);
>> + struct mmc_command *cmd;
>> + struct sdhci_pci_slot *slot = sdhci_priv(host);
>> + struct pci_dev *pdev = slot->chip->pdev;
>> + u32 value;
>> + static bool start_4k_r;
>> + static int continuous_4k_r;
>
> Please do not use static variables. Instead define a struct for them and
> set .priv_size in sdhci_pci_fixes e.g.
>
> struct sdhci_pci_gli {
> static bool start_4k_r;
> static int continuous_4k_r;
> };
Cut'n'pasted without paying attention. This was meant to be:
struct sdhci_pci_gli {
bool start_4k_r;
int continuous_4k_r;
};
>
> const struct sdhci_pci_fixes sdhci_gl9763e = {
> .quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
> .probe_slot = gli_probe_slot_gl9763e,
> .ops = &sdhci_gl9763e_ops,
> #ifdef CONFIG_PM_SLEEP
> .resume = sdhci_cqhci_gli_resume,
> .suspend = sdhci_cqhci_gli_suspend,
> #endif
> .add_host = gl9763e_add_host,
> .priv_size = sizeof(struct sdhci_pci_gli);
> };
>
> And then you can get a pointer to it:
>
> struct sdhci_pci_gli *sdhci_pci_gli = sdhci_pci_priv(slot);
>
>
>> +
>> + cmd = (mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23)) ? mrq->sbc : mrq->cmd;
>
> mrq->cmd is always the main command, so why look at mrq->sbc?
>
>> +
>> + if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK) {
>> + if (cmd->data->blocks == 8) {
>> + continuous_4k_r++;
>> +
>> + if ((!start_4k_r) && (continuous_4k_r >= 3)) {
>> + pci_read_config_dword(pdev, PCIE_GLI_9763E_VHS, &value);
>> + value &= ~GLI_9763E_VHS_REV;
>> + value |= FIELD_PREP(GLI_9763E_VHS_REV, GLI_9763E_VHS_REV_W);
>> + pci_write_config_dword(pdev, PCIE_GLI_9763E_VHS, value);
>> +
>> + pci_read_config_dword(pdev, PCIE_GLI_9763E_CFG, &value);
>> + value |= GLI_9763E_CFG_LPSN_DIS;
>> + pci_write_config_dword(pdev, PCIE_GLI_9763E_CFG, value);
>> +
>> + pci_read_config_dword(pdev, PCIE_GLI_9763E_VHS, &value);
>> + value &= ~GLI_9763E_VHS_REV;
>> + value |= FIELD_PREP(GLI_9763E_VHS_REV, GLI_9763E_VHS_REV_R);
>> + pci_write_config_dword(pdev, PCIE_GLI_9763E_VHS, value);
>> +
>> + start_4k_r = true;
>> + }
>> + } else {
>> + continuous_4k_r = 0;
>> +
>> + if (start_4k_r) {
>> + pci_read_config_dword(pdev, PCIE_GLI_9763E_VHS, &value);
>> + value &= ~GLI_9763E_VHS_REV;
>> + value |= FIELD_PREP(GLI_9763E_VHS_REV, GLI_9763E_VHS_REV_W);
>> + pci_write_config_dword(pdev, PCIE_GLI_9763E_VHS, value);
>> +
>> + pci_read_config_dword(pdev, PCIE_GLI_9763E_CFG, &value);
>> + value &= ~GLI_9763E_CFG_LPSN_DIS;
>> + pci_write_config_dword(pdev, PCIE_GLI_9763E_CFG, value);
>> +
>> + pci_read_config_dword(pdev, PCIE_GLI_9763E_VHS, &value);
>> + value &= ~GLI_9763E_VHS_REV;
>> + value |= FIELD_PREP(GLI_9763E_VHS_REV, GLI_9763E_VHS_REV_R);
>> + pci_write_config_dword(pdev, PCIE_GLI_9763E_VHS, value);
>> +
>> + start_4k_r = false;
>> + }
>> + }
>> + } else {
>> + continuous_4k_r = 0;
>> +
>> + if (start_4k_r) {
>> + pci_read_config_dword(pdev, PCIE_GLI_9763E_VHS, &value);
>> + value &= ~GLI_9763E_VHS_REV;
>> + value |= FIELD_PREP(GLI_9763E_VHS_REV, GLI_9763E_VHS_REV_W);
>> + pci_write_config_dword(pdev, PCIE_GLI_9763E_VHS, value);
>> +
>> + pci_read_config_dword(pdev, PCIE_GLI_9763E_CFG, &value);
>> + value &= ~GLI_9763E_CFG_LPSN_DIS;
>> + pci_write_config_dword(pdev, PCIE_GLI_9763E_CFG, value);
>> +
>> + pci_read_config_dword(pdev, PCIE_GLI_9763E_VHS, &value);
>> + value &= ~GLI_9763E_VHS_REV;
>> + value |= FIELD_PREP(GLI_9763E_VHS_REV, GLI_9763E_VHS_REV_R);
>> + pci_write_config_dword(pdev, PCIE_GLI_9763E_VHS, value);
>> +
>> + start_4k_r = false;
>> + }
>
> The code chunk above is the same as the previous and almost
> the same as the one before that. Please make a separate function
>
>> + }
>> +
>> + sdhci_request(mmc, mrq);
>> +}
>> +
>> +
>> static void sdhci_gl9763e_cqe_pre_enable(struct mmc_host *mmc)
>> {
>> struct cqhci_host *cq_host = mmc->cqe_private;
>> @@ -848,6 +931,9 @@ static int gli_probe_slot_gl9763e(struct sdhci_pci_slot *slot)
>> gli_pcie_enable_msi(slot);
>> host->mmc_host_ops.hs400_enhanced_strobe =
>> gl9763e_hs400_enhanced_strobe;
>> +
>> + host->mmc_host_ops.request = gl9763e_request;
>> +
>> gli_set_gl9763e(slot);
>> sdhci_enable_v4_mode(host);
>>
>>
>
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