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    SubjectRe: [PATCH 3/3] firmware: qcom: scm: Add function to set IOMMU pagetable addressing
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    On 12/8/21 2:34 AM, Marijn Suijten wrote:
    > From: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.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@somainline.org>
    > [Marijn: ported from 5.3 to the unified architecture in 5.11]
    > Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
    > Reviewed-by: Konrad Dybcio <konrad.dybcio@somainline.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,
    >

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