gpu: nvgpu: isolate common & hal falcon_copy_from|to_dmem|imem functions

nvgpu_falcon_copy_from|to_dmem|imem should validate copy parameters. And
gk20a_falcon_copy_from|to_dmem|imem is supposed to be hal API that will
copy the data.

JIRA NVGPU-1459

Change-Id: I2648721f42cffd30d29058818af26d4ad47c7277
Signed-off-by: Sagar Kamble <skamble@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2015592
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-misra <svc-mobile-misra@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Mahantesh Kumbar <mkumbar@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/gpu/nvgpu/common/falcon/falcon.c

@@ -281,6 +281,45 @@ int nvgpu_falcon_copy_to_emem(struct nvgpu_falcon *flcn,
 	return status;
 }
 
+static int falcon_memcpy_params_check(struct nvgpu_falcon *flcn,
+		u32 offset, u32 size, enum falcon_mem_type mem_type)
+{
+	struct nvgpu_falcon_ops *flcn_ops = &flcn->flcn_ops;
+	struct gk20a *g = flcn->g;
+	u32 mem_size = 0;
+	int ret = -EINVAL;
+
+	if (size == 0U) {
+		nvgpu_err(g, "size is zero");
+		goto exit;
+	}
+
+	if ((offset & 0x3U) != 0U) {
+		nvgpu_err(g, "offset (0x%08x) not 4-byte aligned", offset);
+		goto exit;
+	}
+
+	if (flcn_ops->get_mem_size == NULL) {
+		nvgpu_warn(flcn->g, "Invalid op on falcon 0x%x ",
+			flcn->flcn_id);
+		goto exit;
+	}
+
+	mem_size = flcn_ops->get_mem_size(flcn, mem_type);
+	if (!(offset <= mem_size && (offset + size) <= mem_size)) {
+		nvgpu_err(g, "flcn-id 0x%x, copy overflow ",
+			flcn->flcn_id);
+		nvgpu_err(g, "total size 0x%x, offset 0x%x, copy size 0x%x",
+			mem_size, offset, size);
+		goto exit;
+	}
+
+	ret = 0;
+
+exit:
+	return ret;
+}
+
 int nvgpu_falcon_copy_from_dmem(struct nvgpu_falcon *flcn,
 	u32 src, u8 *dst, u32 size, u8 port)
 {
@@ -288,20 +327,27 @@ int nvgpu_falcon_copy_from_dmem(struct nvgpu_falcon *flcn,
 	int status = -EINVAL;
 
 	if (flcn == NULL) {
-		return -EINVAL;
+		goto exit;
 	}
 
 	flcn_ops = &flcn->flcn_ops;
 
-	if (flcn_ops->copy_from_dmem != NULL) {
+	if (flcn_ops->copy_from_dmem == NULL) {
+		nvgpu_warn(flcn->g, "Invalid op on falcon 0x%x ",
+			flcn->flcn_id);
+		goto exit;
+	}
+
+	if (falcon_memcpy_params_check(flcn, src, size, MEM_DMEM) != 0) {
+		nvgpu_err(flcn->g, "incorrect parameters");
+		goto exit;
+	}
+
 	nvgpu_mutex_acquire(&flcn->copy_lock);
 	status = flcn_ops->copy_from_dmem(flcn, src, dst, size, port);
 	nvgpu_mutex_release(&flcn->copy_lock);
-	} else {
-		nvgpu_warn(flcn->g, "Invalid op on falcon 0x%x ",
-			flcn->flcn_id);
-	}
 
+exit:
 	return status;
 }
 
@@ -312,20 +358,27 @@ int nvgpu_falcon_copy_to_dmem(struct nvgpu_falcon *flcn,
 	int status = -EINVAL;
 
 	if (flcn == NULL) {
-		return -EINVAL;
+		goto exit;
 	}
 
 	flcn_ops = &flcn->flcn_ops;
 
-	if (flcn_ops->copy_to_dmem != NULL) {
+	if (flcn_ops->copy_to_dmem == NULL) {
+		nvgpu_warn(flcn->g, "Invalid op on falcon 0x%x ",
+			flcn->flcn_id);
+		goto exit;
+	}
+
+	if (falcon_memcpy_params_check(flcn, dst, size, MEM_DMEM) != 0) {
+		nvgpu_err(flcn->g, "incorrect parameters");
+		goto exit;
+	}
+
 	nvgpu_mutex_acquire(&flcn->copy_lock);
 	status = flcn_ops->copy_to_dmem(flcn, dst, src, size, port);
 	nvgpu_mutex_release(&flcn->copy_lock);
-	} else {
-		nvgpu_warn(flcn->g, "Invalid op on falcon 0x%x ",
-			flcn->flcn_id);
-	}
 
+exit:
 	return status;
 }
 
@@ -336,20 +389,27 @@ int nvgpu_falcon_copy_from_imem(struct nvgpu_falcon *flcn,
 	int status = -EINVAL;
 
 	if (flcn == NULL) {
-		return -EINVAL;
+		goto exit;
 	}
 
 	flcn_ops = &flcn->flcn_ops;
 
-	if (flcn_ops->copy_from_imem != NULL) {
+	if (flcn_ops->copy_from_imem == NULL) {
+		nvgpu_warn(flcn->g, "Invalid op on falcon 0x%x ",
+			flcn->flcn_id);
+		goto exit;
+	}
+
+	if (falcon_memcpy_params_check(flcn, src, size, MEM_IMEM) != 0) {
+		nvgpu_err(flcn->g, "incorrect parameters");
+		goto exit;
+	}
+
 	nvgpu_mutex_acquire(&flcn->copy_lock);
 	status = flcn_ops->copy_from_imem(flcn, src, dst, size, port);
 	nvgpu_mutex_release(&flcn->copy_lock);
-	} else {
-		nvgpu_warn(flcn->g, "Invalid op on falcon 0x%x ",
-			flcn->flcn_id);
-	}
 
+exit:
 	return status;
 }
 
@@ -360,21 +420,28 @@ int nvgpu_falcon_copy_to_imem(struct nvgpu_falcon *flcn,
 	int status = -EINVAL;
 
 	if (flcn == NULL) {
-		return -EINVAL;
+		goto exit;
 	}
 
 	flcn_ops = &flcn->flcn_ops;
 
-	if (flcn_ops->copy_to_imem != NULL) {
+	if (flcn_ops->copy_to_imem == NULL) {
+		nvgpu_warn(flcn->g, "Invalid op on falcon 0x%x ",
+			flcn->flcn_id);
+		goto exit;
+	}
+
+	if (falcon_memcpy_params_check(flcn, dst, size, MEM_IMEM) != 0) {
+		nvgpu_err(flcn->g, "incorrect parameters");
+		goto exit;
+	}
+
 	nvgpu_mutex_acquire(&flcn->copy_lock);
 	status = flcn_ops->copy_to_imem(flcn, dst, src, size, port,
 				sec, tag);
 	nvgpu_mutex_release(&flcn->copy_lock);
-	} else {
-		nvgpu_warn(flcn->g, "Invalid op on falcon 0x%x ",
-			flcn->flcn_id);
-	}
 
+exit:
 	return status;
 }
 

drivers/gpu/nvgpu/common/falcon/falcon_gk20a.c

@@ -148,34 +148,6 @@ static u32 gk20a_falcon_get_mem_size(struct nvgpu_falcon *flcn,
 	return mem_size;
 }
 
-static int falcon_mem_overflow_check(struct nvgpu_falcon *flcn,
-		u32 offset, u32 size, enum falcon_mem_type mem_type)
-{
-	struct gk20a *g = flcn->g;
-	u32 mem_size = 0;
-
-	if (size == 0U) {
-		nvgpu_err(g, "size is zero");
-		return -EINVAL;
-	}
-
-	if ((offset & 0x3U) != 0U) {
-		nvgpu_err(g, "offset (0x%08x) not 4-byte aligned", offset);
-		return -EINVAL;
-	}
-
-	mem_size = gk20a_falcon_get_mem_size(flcn, mem_type);
-	if (!(offset <= mem_size && (offset + size) <= mem_size)) {
-		nvgpu_err(g, "flcn-id 0x%x, copy overflow ",
-			flcn->flcn_id);
-		nvgpu_err(g, "total size 0x%x, offset 0x%x, copy size 0x%x",
-			mem_size, offset, size);
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
 static int gk20a_falcon_copy_from_dmem(struct nvgpu_falcon *flcn,
 		u32 src, u8 *dst, u32 size, u8 port)
 {
@@ -187,11 +159,6 @@ static int gk20a_falcon_copy_from_dmem(struct nvgpu_falcon *flcn,
 
 	nvgpu_log_fn(g, " src dmem offset - %x, size - %x", src, size);
 
-	if (falcon_mem_overflow_check(flcn, src, size, MEM_DMEM) != 0) {
-		nvgpu_err(g, "incorrect parameters");
-		return -EINVAL;
-	}
-
 	words = size >> 2;
 	bytes = size & 0x3U;
 
@@ -229,11 +196,6 @@ static int gk20a_falcon_copy_to_dmem(struct nvgpu_falcon *flcn,
 
 	nvgpu_log_fn(g, "dest dmem offset - %x, size - %x", dst, size);
 
-	if (falcon_mem_overflow_check(flcn, dst, size, MEM_DMEM) != 0) {
-		nvgpu_err(g, "incorrect parameters");
-		return -EINVAL;
-	}
-
 	words = size >> 2;
 	bytes = size & 0x3U;
 
@@ -283,11 +245,6 @@ static int gk20a_falcon_copy_from_imem(struct nvgpu_falcon *flcn, u32 src,
 
 	nvgpu_log_info(g, "download %d bytes from 0x%x", size, src);
 
-	if (falcon_mem_overflow_check(flcn, src, size, MEM_IMEM) != 0) {
-		nvgpu_err(g, "incorrect parameters");
-		return -EINVAL;
-	}
-
 	words = size >> 2;
 	bytes = size & 0x3U;
 	blk = src >> 8;
@@ -327,11 +284,6 @@ static int gk20a_falcon_copy_to_imem(struct nvgpu_falcon *flcn, u32 dst,
 
 	nvgpu_log_info(g, "upload %d bytes to 0x%x", size, dst);
 
-	if (falcon_mem_overflow_check(flcn, dst, size, MEM_IMEM) != 0) {
-		nvgpu_err(g, "incorrect parameters");
-		return -EINVAL;
-	}
-
 	words = size >> 2;
 	blk = dst >> 8;