[PATCH v2 1/2] firmware: qcom: scm: Introduce CP_SMMU_APERTURE_ID

[Rob Clark]

On Sun, Nov 10, 2024 at 9:31 AM Bjorn Andersson
<bjorn.andersson at oss.qualcomm.com> wrote:
>
> The QCOM_SCM_SVC_MP service provides QCOM_SCM_MP_CP_SMMU_APERTURE_ID,
> which is used to trigger the mapping of register banks into the SMMU
> context for per-processes page tables to function (in case this isn't
> statically setup by firmware).
>
> This is necessary on e.g. QCS6490 Rb3Gen2, in order to avoid "CP | AHB
> bus error"-errors from the GPU.
>
> Introduce a function to allow the msm driver to invoke this call.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson at oss.qualcomm.com>

Reviewed-by: Rob Clark <robdclark at gmail.com>

> ---
>  drivers/firmware/qcom/qcom_scm.c       | 26 ++++++++++++++++++++++++++
>  drivers/firmware/qcom/qcom_scm.h       |  1 +
>  include/linux/firmware/qcom/qcom_scm.h |  2 ++
>  3 files changed, 29 insertions(+)
>
> diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
> index 95815e64e1e6..72bf87ddcd96 100644
> --- a/drivers/firmware/qcom/qcom_scm.c
> +++ b/drivers/firmware/qcom/qcom_scm.c
> @@ -904,6 +904,32 @@ int qcom_scm_restore_sec_cfg(u32 device_id, u32 spare)
>  }
>  EXPORT_SYMBOL_GPL(qcom_scm_restore_sec_cfg);
>
> +#define QCOM_SCM_CP_APERTURE_CONTEXT_MASK      GENMASK(7, 0)
> +
> +bool qcom_scm_set_gpu_smmu_aperture_is_available(void)
> +{
> +       return __qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_MP,
> +                                           QCOM_SCM_MP_CP_SMMU_APERTURE_ID);
> +}
> +EXPORT_SYMBOL_GPL(qcom_scm_set_gpu_smmu_aperture_is_available);
> +
> +int qcom_scm_set_gpu_smmu_aperture(unsigned int context_bank)
> +{
> +       struct qcom_scm_desc desc = {
> +               .svc = QCOM_SCM_SVC_MP,
> +               .cmd = QCOM_SCM_MP_CP_SMMU_APERTURE_ID,
> +               .arginfo = QCOM_SCM_ARGS(4),
> +               .args[0] = 0xffff0000 | FIELD_PREP(QCOM_SCM_CP_APERTURE_CONTEXT_MASK, context_bank),
> +               .args[1] = 0xffffffff,
> +               .args[2] = 0xffffffff,
> +               .args[3] = 0xffffffff,
> +               .owner = ARM_SMCCC_OWNER_SIP
> +       };
> +
> +       return qcom_scm_call(__scm->dev, &desc, NULL);
> +}
> +EXPORT_SYMBOL_GPL(qcom_scm_set_gpu_smmu_aperture);
> +
>  int qcom_scm_iommu_secure_ptbl_size(u32 spare, size_t *size)
>  {
>         struct qcom_scm_desc desc = {
> diff --git a/drivers/firmware/qcom/qcom_scm.h b/drivers/firmware/qcom/qcom_scm.h
> index 685b8f59e7a6..e36b2f67607f 100644
> --- a/drivers/firmware/qcom/qcom_scm.h
> +++ b/drivers/firmware/qcom/qcom_scm.h
> @@ -116,6 +116,7 @@ struct qcom_tzmem_pool *qcom_scm_get_tzmem_pool(void);
>  #define QCOM_SCM_MP_IOMMU_SET_CP_POOL_SIZE     0x05
>  #define QCOM_SCM_MP_VIDEO_VAR                  0x08
>  #define QCOM_SCM_MP_ASSIGN                     0x16
> +#define QCOM_SCM_MP_CP_SMMU_APERTURE_ID                0x1b
>  #define QCOM_SCM_MP_SHM_BRIDGE_ENABLE          0x1c
>  #define QCOM_SCM_MP_SHM_BRIDGE_DELETE          0x1d
>  #define QCOM_SCM_MP_SHM_BRIDGE_CREATE          0x1e
> diff --git a/include/linux/firmware/qcom/qcom_scm.h b/include/linux/firmware/qcom/qcom_scm.h
> index 9f14976399ab..4621aec0328c 100644
> --- a/include/linux/firmware/qcom/qcom_scm.h
> +++ b/include/linux/firmware/qcom/qcom_scm.h
> @@ -85,6 +85,8 @@ int qcom_scm_io_writel(phys_addr_t addr, unsigned int val);
>
>  bool qcom_scm_restore_sec_cfg_available(void);
>  int qcom_scm_restore_sec_cfg(u32 device_id, u32 spare);
> +int qcom_scm_set_gpu_smmu_aperture(unsigned int context_bank);
> +bool qcom_scm_set_gpu_smmu_aperture_is_available(void);
>  int qcom_scm_iommu_secure_ptbl_size(u32 spare, size_t *size);
>  int qcom_scm_iommu_secure_ptbl_init(u64 addr, u32 size, u32 spare);
>  int qcom_scm_iommu_set_cp_pool_size(u32 spare, u32 size);
>
> --
> 2.45.2
>