linux-kernel - Re: [PATCH 3/3] firmware: qcom: scm: Add function to set IOMMU pagetable addressing

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Date:   Wed, 8 Dec 2021 07:30:36 -0600
From:   Alex Elder <elder@...aro.org>
To:     Marijn Suijten <marijn.suijten@...ainline.org>,
        phone-devel@...r.kernel.org, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     ~postmarketos/upstreaming@...ts.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Martin Botka <martin.botka@...ainline.org>,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        Pavel Dubrova <pashadubrova@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Arnd Bergmann <arnd@...db.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thara Gopinath <thara.gopinath@...aro.org>,
        Elliot Berman <eberman@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] firmware: qcom: scm: Add function to set IOMMU
 pagetable addressing

On 12/8/21 2:34 AM, Marijn Suijten wrote:
> From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
> 
> Add a function to change the IOMMU pagetable addressing to
> AArch32 LPAE or AArch64. If doing that, then this must be
> done for each IOMMU context (not necessarily at the same time).
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
> [Marijn: ported from 5.3 to the unified architecture in 5.11]
> Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>
> Reviewed-by: Konrad Dybcio <konrad.dybcio@...ainline.org>

Are there no users of this function?	-Alex

> ---
>   drivers/firmware/qcom_scm.c | 16 ++++++++++++++++
>   drivers/firmware/qcom_scm.h |  1 +
>   include/linux/qcom_scm.h    |  1 +
>   3 files changed, 18 insertions(+)
> 
> diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
> index d5a9ba15e2ba..6f7096120023 100644
> --- a/drivers/firmware/qcom_scm.c
> +++ b/drivers/firmware/qcom_scm.c
> @@ -1140,6 +1140,22 @@ int qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt, u32 *resp)
>   }
>   EXPORT_SYMBOL(qcom_scm_hdcp_req);
>   
> +int qcom_scm_iommu_set_pt_format(u32 sec_id, u32 ctx_num, u32 pt_fmt)
> +{
> +	struct qcom_scm_desc desc = {
> +		.svc = QCOM_SCM_SVC_SMMU_PROGRAM,
> +		.cmd = QCOM_SCM_SMMU_PT_FORMAT,
> +		.arginfo = QCOM_SCM_ARGS(3),
> +		.args[0] = sec_id,
> +		.args[1] = ctx_num,
> +		.args[2] = pt_fmt, /* 0: LPAE AArch32 - 1: AArch64 */
> +		.owner = ARM_SMCCC_OWNER_SIP,
> +	};
> +
> +	return qcom_scm_call(__scm->dev, &desc, NULL);
> +}
> +EXPORT_SYMBOL(qcom_scm_iommu_set_pt_format);
> +
>   int qcom_scm_qsmmu500_wait_safe_toggle(bool en)
>   {
>   	struct qcom_scm_desc desc = {
> diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h
> index bb627941702b..a348f2c214e5 100644
> --- a/drivers/firmware/qcom_scm.h
> +++ b/drivers/firmware/qcom_scm.h
> @@ -120,6 +120,7 @@ extern int scm_legacy_call(struct device *dev, const struct qcom_scm_desc *desc,
>   #define QCOM_SCM_LMH_LIMIT_DCVSH		0x10
>   
>   #define QCOM_SCM_SVC_SMMU_PROGRAM		0x15
> +#define QCOM_SCM_SMMU_PT_FORMAT			0x01
>   #define QCOM_SCM_SMMU_CONFIG_ERRATA1		0x03
>   #define QCOM_SCM_SMMU_CONFIG_ERRATA1_CLIENT_ALL	0x02
>   
> diff --git a/include/linux/qcom_scm.h b/include/linux/qcom_scm.h
> index 8a065f8660c1..ca4a88d7cbdc 100644
> --- a/include/linux/qcom_scm.h
> +++ b/include/linux/qcom_scm.h
> @@ -108,6 +108,7 @@ extern bool qcom_scm_hdcp_available(void);
>   extern int qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt,
>   			     u32 *resp);
>   
> +extern int qcom_scm_iommu_set_pt_format(u32 sec_id, u32 ctx_num, u32 pt_fmt);
>   extern int qcom_scm_qsmmu500_wait_safe_toggle(bool en);
>   
>   extern int qcom_scm_lmh_dcvsh(u32 payload_fn, u32 payload_reg, u32 payload_val,
>