drm/msm: Add a helper function for in-kernel buffer allocations

Nearly all of the buffer allocations for kernel allocate an buffer object,
virtual address and GPU iova at the same time. Make a helper function to
handle the details.
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
[dropped msm_fbdev conversion to new helper, since it interferes with
display-handover work, where we want to separate allocation and mapping]
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/adreno/a5xx_gpu.c

@@ -284,28 +284,14 @@ static int a5xx_me_init(struct msm_gpu *gpu)
 static struct drm_gem_object *a5xx_ucode_load_bo(struct msm_gpu *gpu,
 		const struct firmware *fw, u64 *iova)
 {
-	struct drm_device *drm = gpu->dev;
 	struct drm_gem_object *bo;
 	void *ptr;
 
-	bo = msm_gem_new_locked(drm, fw->size - 4, MSM_BO_UNCACHED);
-	if (IS_ERR(bo))
-		return bo;
+	ptr = msm_gem_kernel_new_locked(gpu->dev, fw->size - 4,
+		MSM_BO_UNCACHED | MSM_BO_GPU_READONLY, gpu->aspace, &bo, iova);
 
-	ptr = msm_gem_get_vaddr(bo);
-	if (!ptr) {
-		drm_gem_object_unreference(bo);
-		return ERR_PTR(-ENOMEM);
-	}
-
-	if (iova) {
-		int ret = msm_gem_get_iova(bo, gpu->aspace, iova);
-
-		if (ret) {
-			drm_gem_object_unreference(bo);
-			return ERR_PTR(ret);
-		}
-	}
+	if (IS_ERR(ptr))
+		return ERR_CAST(ptr);
 
 	memcpy(ptr, &fw->data[4], fw->size - 4);
 

drivers/gpu/drm/msm/adreno/a5xx_power.c

@@ -294,16 +294,10 @@ void a5xx_gpmu_ucode_init(struct msm_gpu *gpu)
 	 */
 	bosize = (cmds_size + (cmds_size / TYPE4_MAX_PAYLOAD) + 1) << 2;
 
-	a5xx_gpu->gpmu_bo = msm_gem_new_locked(drm, bosize, MSM_BO_UNCACHED);
-	if (IS_ERR(a5xx_gpu->gpmu_bo))
-		goto err;
-
-	if (msm_gem_get_iova(a5xx_gpu->gpmu_bo, gpu->aspace,
-			&a5xx_gpu->gpmu_iova))
-		goto err;
-
-	ptr = msm_gem_get_vaddr(a5xx_gpu->gpmu_bo);
-	if (!ptr)
+	ptr = msm_gem_kernel_new_locked(drm, bosize,
+		MSM_BO_UNCACHED | MSM_BO_GPU_READONLY, gpu->aspace,
+		&a5xx_gpu->gpmu_bo, &a5xx_gpu->gpmu_iova);
+	if (IS_ERR(ptr))
 		goto err;
 
 	while (cmds_size > 0) {

drivers/gpu/drm/msm/adreno/adreno_gpu.c

@@ -391,29 +391,17 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 		return ret;
 	}
 
-	adreno_gpu->memptrs_bo = msm_gem_new(drm, sizeof(*adreno_gpu->memptrs),
-			MSM_BO_UNCACHED);
-	if (IS_ERR(adreno_gpu->memptrs_bo)) {
-		ret = PTR_ERR(adreno_gpu->memptrs_bo);
-		adreno_gpu->memptrs_bo = NULL;
-		dev_err(drm->dev, "could not allocate memptrs: %d\n", ret);
-		return ret;
-	}
+	adreno_gpu->memptrs = msm_gem_kernel_new(drm,
+		sizeof(*adreno_gpu->memptrs), MSM_BO_UNCACHED, gpu->aspace,
+		&adreno_gpu->memptrs_bo, &adreno_gpu->memptrs_iova);
 
-	adreno_gpu->memptrs = msm_gem_get_vaddr(adreno_gpu->memptrs_bo);
 	if (IS_ERR(adreno_gpu->memptrs)) {
-		dev_err(drm->dev, "could not vmap memptrs\n");
-		return -ENOMEM;
-	}
-
-	ret = msm_gem_get_iova(adreno_gpu->memptrs_bo, gpu->aspace,
-			&adreno_gpu->memptrs_iova);
-	if (ret) {
-		dev_err(drm->dev, "could not map memptrs: %d\n", ret);
-		return ret;
+		ret = PTR_ERR(adreno_gpu->memptrs);
+		adreno_gpu->memptrs = NULL;
+		dev_err(drm->dev, "could not allocate memptrs: %d\n", ret);
 	}
 
-	return 0;
+	return ret;
 }
 
 void adreno_gpu_cleanup(struct adreno_gpu *adreno_gpu)

drivers/gpu/drm/msm/msm_drv.h

@@ -237,6 +237,12 @@ struct drm_gem_object *msm_gem_new(struct drm_device *dev,
 		uint32_t size, uint32_t flags);
 struct drm_gem_object *msm_gem_new_locked(struct drm_device *dev,
 		uint32_t size, uint32_t flags);
+void *msm_gem_kernel_new(struct drm_device *dev, uint32_t size,
+		uint32_t flags, struct msm_gem_address_space *aspace,
+		struct drm_gem_object **bo, uint64_t *iova);
+void *msm_gem_kernel_new_locked(struct drm_device *dev, uint32_t size,
+		uint32_t flags, struct msm_gem_address_space *aspace,
+		struct drm_gem_object **bo, uint64_t *iova);
 struct drm_gem_object *msm_gem_import(struct drm_device *dev,
 		struct dma_buf *dmabuf, struct sg_table *sgt);
 

drivers/gpu/drm/msm/msm_gem.c

@@ -1024,3 +1024,49 @@ struct drm_gem_object *msm_gem_import(struct drm_device *dev,
 	drm_gem_object_unreference_unlocked(obj);
 	return ERR_PTR(ret);
 }
+
+static void *_msm_gem_kernel_new(struct drm_device *dev, uint32_t size,
+		uint32_t flags, struct msm_gem_address_space *aspace,
+		struct drm_gem_object **bo, uint64_t *iova, bool locked)
+{
+	void *vaddr;
+	struct drm_gem_object *obj = _msm_gem_new(dev, size, flags, locked);
+	int ret;
+
+	if (IS_ERR(obj))
+		return ERR_CAST(obj);
+
+	if (iova) {
+		ret = msm_gem_get_iova(obj, aspace, iova);
+		if (ret) {
+			drm_gem_object_unreference(obj);
+			return ERR_PTR(ret);
+		}
+	}
+
+	vaddr = msm_gem_get_vaddr(obj);
+	if (!vaddr) {
+		msm_gem_put_iova(obj, aspace);
+		drm_gem_object_unreference(obj);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	if (bo)
+		*bo = obj;
+
+	return vaddr;
+}
+
+void *msm_gem_kernel_new(struct drm_device *dev, uint32_t size,
+		uint32_t flags, struct msm_gem_address_space *aspace,
+		struct drm_gem_object **bo, uint64_t *iova)
+{
+	return _msm_gem_kernel_new(dev, size, flags, aspace, bo, iova, false);
+}
+
+void *msm_gem_kernel_new_locked(struct drm_device *dev, uint32_t size,
+		uint32_t flags, struct msm_gem_address_space *aspace,
+		struct drm_gem_object **bo, uint64_t *iova)
+{
+	return _msm_gem_kernel_new(dev, size, flags, aspace, bo, iova, true);
+}

drivers/gpu/drm/msm/msm_ringbuffer.c

@@ -33,16 +33,14 @@ struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int size)
 	}
 
 	ring->gpu = gpu;
-	ring->bo = msm_gem_new(gpu->dev, size, MSM_BO_WC);
-	if (IS_ERR(ring->bo)) {
-		ret = PTR_ERR(ring->bo);
-		ring->bo = NULL;
-		goto fail;
-	}
 
-	ring->start = msm_gem_get_vaddr(ring->bo);
+	/* Pass NULL for the iova pointer - we will map it later */
+	ring->start = msm_gem_kernel_new(gpu->dev, size, MSM_BO_WC,
+		gpu->aspace, &ring->bo, NULL);
+
 	if (IS_ERR(ring->start)) {
 		ret = PTR_ERR(ring->start);
+		ring->start = 0;
 		goto fail;
 	}
 	ring->end   = ring->start + (size / 4);