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@xxxxxxxxxxxxxxxx>
---
drivers/firmware/qcom/qcom_scm.c | 19 +++++++++++++++++++
drivers/firmware/qcom/qcom_scm.h | 1 +
include/linux/firmware/qcom/qcom_scm.h | 1 +
3 files changed, 21 insertions(+)
diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
index 10986cb11ec0..bd633c57b6e8 100644
--- a/drivers/firmware/qcom/qcom_scm.c
+++ b/drivers/firmware/qcom/qcom_scm.c
@@ -903,6 +903,25 @@ 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)
+
+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..23ec8ee5e49f 100644
--- a/include/linux/firmware/qcom/qcom_scm.h
+++ b/include/linux/firmware/qcom/qcom_scm.h
@@ -85,6 +85,7 @@ 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);
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
