linux-kernel - [PATCH 1/2] firmware: qcom_scm: Add memory protect virtual address ranges

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Message-Id: <20200709115829.8194-2-stanimir.varbanov@linaro.org>
Date:   Thu,  9 Jul 2020 14:58:28 +0300
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Elliot Berman <eberman@...eaurora.org>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>
Subject: [PATCH 1/2] firmware: qcom_scm: Add memory protect virtual address ranges

This adds a new SCM memprotect command to set virtual address ranges.

Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
---
 drivers/firmware/qcom_scm.c | 24 ++++++++++++++++++++++++
 drivers/firmware/qcom_scm.h |  1 +
 include/linux/qcom_scm.h    |  8 +++++++-
 3 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index 0e7233a20f34..a73870255c2e 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -864,6 +864,30 @@ int qcom_scm_assign_mem(phys_addr_t mem_addr, size_t mem_sz,
 }
 EXPORT_SYMBOL(qcom_scm_assign_mem);
 
+int qcom_scm_mem_protect_video_var(u32 cp_start, u32 cp_size,
+				   u32 cp_nonpixel_start,
+				   u32 cp_nonpixel_size)
+{
+	int ret;
+	struct qcom_scm_desc desc = {
+		.svc = QCOM_SCM_SVC_MP,
+		.cmd = QCOM_SCM_MP_VIDEO_VAR,
+		.arginfo = QCOM_SCM_ARGS(4, QCOM_SCM_VAL, QCOM_SCM_VAL,
+					 QCOM_SCM_VAL, QCOM_SCM_VAL),
+		.args[0] = cp_start,
+		.args[1] = cp_size,
+		.args[2] = cp_nonpixel_start,
+		.args[3] = cp_nonpixel_size,
+		.owner = ARM_SMCCC_OWNER_SIP,
+	};
+	struct qcom_scm_res res;
+
+	ret = qcom_scm_call(__scm->dev, &desc, &res);
+
+	return ret ? : res.result[0];
+}
+EXPORT_SYMBOL(qcom_scm_mem_protect_video_var);
+
 /**
  * qcom_scm_ocmem_lock_available() - is OCMEM lock/unlock interface available
  */
diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h
index d9ed670da222..14da834ac593 100644
--- a/drivers/firmware/qcom_scm.h
+++ b/drivers/firmware/qcom_scm.h
@@ -97,6 +97,7 @@ extern int scm_legacy_call(struct device *dev, const struct qcom_scm_desc *desc,
 #define QCOM_SCM_MP_RESTORE_SEC_CFG		0x02
 #define QCOM_SCM_MP_IOMMU_SECURE_PTBL_SIZE	0x03
 #define QCOM_SCM_MP_IOMMU_SECURE_PTBL_INIT	0x04
+#define QCOM_SCM_MP_VIDEO_VAR			0x08
 #define QCOM_SCM_MP_ASSIGN			0x16
 
 #define QCOM_SCM_SVC_OCMEM		0x0f
diff --git a/include/linux/qcom_scm.h b/include/linux/qcom_scm.h
index 3d6a24697761..19b5188d17f4 100644
--- a/include/linux/qcom_scm.h
+++ b/include/linux/qcom_scm.h
@@ -81,7 +81,9 @@ extern int qcom_scm_assign_mem(phys_addr_t mem_addr, size_t mem_sz,
 			       unsigned int *src,
 			       const struct qcom_scm_vmperm *newvm,
 			       unsigned int dest_cnt);
-
+extern int qcom_scm_mem_protect_video_var(u32 cp_start, u32 cp_size,
+					  u32 cp_nonpixel_start,
+					  u32 cp_nonpixel_size);
 extern bool qcom_scm_ocmem_lock_available(void);
 extern int qcom_scm_ocmem_lock(enum qcom_scm_ocmem_client id, u32 offset,
 			       u32 size, u32 mode);
@@ -131,6 +133,10 @@ static inline int qcom_scm_iommu_secure_ptbl_init(u64 addr, u32 size, u32 spare)
 static inline int qcom_scm_assign_mem(phys_addr_t mem_addr, size_t mem_sz,
 		unsigned int *src, const struct qcom_scm_vmperm *newvm,
 		unsigned int dest_cnt) { return -ENODEV; }
+extern inline int qcom_scm_mem_protect_video_var(u32 cp_start, u32 cp_size,
+						 u32 cp_nonpixel_start,
+						 u32 cp_nonpixel_size)
+		{ return -ENODEV; }
 
 static inline bool qcom_scm_ocmem_lock_available(void) { return false; }
 static inline int qcom_scm_ocmem_lock(enum qcom_scm_ocmem_client id, u32 offset,
-- 
2.17.1