linux-kernel - [PATCH RFT 1/2] firmware: qcom: scm: Introduce CP_SMMU_APERTURE

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Message-Id: <20241002-adreno-smmu-aparture-v1-1-e9a63c9ccef5@oss.qualcomm.com>
Date: Wed, 02 Oct 2024 20:01:32 -0700
From: Bjorn Andersson <bjorn.andersson@....qualcomm.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        Bjorn Andersson <bjorn.andersson@....qualcomm.com>
Subject: [PATCH RFT 1/2] firmware: qcom: scm: Introduce CP_SMMU_APERTURE_ID

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@....qualcomm.com>
---
 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