linux-kernel - Re: [PATCH v4 5/7] scsi: ufs: ufs-qcom: Switch to the new ICE API

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Date:   Mon, 27 Mar 2023 11:19:34 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Abel Vesa <abel.vesa@...aro.org>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Bart Van Assche <bvanassche@....org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-scsi@...r.kernel.org
Subject: Re: [PATCH v4 5/7] scsi: ufs: ufs-qcom: Switch to the new ICE API

Hi Abel,

On Mon, Mar 27, 2023 at 04:47:32PM +0300, Abel Vesa wrote:
> Now that there is a new dedicated ICE driver, drop the ufs-qcom-ice and
> use the new ICE api provided by the Qualcomm soc driver ice. The platforms
> that already have ICE support will use the API as library since there will
> not be a devicetree node, but instead they have reg range. In this case,
> the of_qcom_ice_get will return an ICE instance created for the consumer's
> device. But if there are platforms that do not have ice reg in the
> consumer devicetree node and instead provide a dedicated ICE devicetree
> node, the of_qcom_ice_get will look up the device based on qcom,ice
> property and will get the ICE instance registered by the probe function
> of the ice driver.
> 
> Signed-off-by: Abel Vesa <abel.vesa@...aro.org>

I am still worried about the ICE clock.  Are you sure it is being managed
correctly?  With your patch, the ICE clock gets enabled in ufs_qcom_ice_resume
and disabled in ufs_qcom_ice_suspend, which hopefully pair up.  But it also gets
enabled in ufs_qcom_ice_enable which isn't paired with anything.  Also, this all
happens at a different time from the existing UFS clocks being enabled/disabled.

I wonder if the ICE clock should be enabled/disabled in ufs_qcom_setup_clocks()
instead of what you are doing currently?

> +static int ufs_qcom_ice_init(struct ufs_qcom_host *host)
> +{
> +	struct ufs_hba *hba = host->hba;
> +	struct device *dev = hba->dev;
> +
> +	host->ice = of_qcom_ice_get(dev);
> +	if (host->ice == ERR_PTR(-EOPNOTSUPP)) {
> +		dev_warn(dev, "Disabling inline encryption support\n");
> +		hba->caps &= ~UFSHCD_CAP_CRYPTO;
> +		host->ice = NULL;
> +	}
> +
> +	if (IS_ERR(host->ice))
> +		return PTR_ERR(host->ice);
> +
> +	return 0;
> +}

This is still sometimes leaving UFSHCD_CAP_CRYPTO set in cases where ICE is
unsupported.

Moving the *setting* of UFSHCD_CAP_CRYPTO into here would fix that.

It is also hard to understand how the -EOPNOTSUPP case differs from the NULL
case.  Can you add a comment?  Or just consider keeping the original behavior,
which did not distinguish between these cases (as long as MASK_CRYPTO_SUPPORT
was set in REG_CONTROLLER_CAPABILITIES, which was checked first).

- Eric