[PATCH 3/6] drm/cma-helper: Use the dma_*_attr API variant

[Rob Herring]

In preparation to allow DRM CMA users to adjust the DMA_ATTR_* flags,
convert the CMA helper code to use the dma_*_attr APIs instead of the
dma_*_wc variants.

Only the DMA_ATTR_WRITE_COMBINE and DMA_ATTR_NO_WARN attributes are set
in this commit, so there's no functional change.

Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Cc: Maxime Ripard <mripard at kernel.org>
Cc: Sean Paul <sean at poorly.run>
Cc: David Airlie <airlied at linux.ie>
Cc: Daniel Vetter <daniel at ffwll.ch>
Signed-off-by: Rob Herring <robh at kernel.org>
---
 drivers/gpu/drm/drm_gem_cma_helper.c | 20 ++++++++++++--------
 include/drm/drm_gem_cma_helper.h     |  1 +
 2 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c b/drivers/gpu/drm/drm_gem_cma_helper.c
index 12e98fb28229..4cebfe01e6ea 100644
--- a/drivers/gpu/drm/drm_gem_cma_helper.c
+++ b/drivers/gpu/drm/drm_gem_cma_helper.c
@@ -70,6 +70,7 @@ __drm_gem_cma_create(struct drm_device *drm, size_t size)
 		goto error;
 	}

+	cma_obj->dma_attrs |= DMA_ATTR_NO_WARN | DMA_ATTR_WRITE_COMBINE;
 	return cma_obj;

 error:
@@ -102,8 +103,9 @@ struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm,
 	if (IS_ERR(cma_obj))
 		return cma_obj;

-	cma_obj->vaddr = dma_alloc_wc(drm->dev, size, &cma_obj->paddr,
-				      GFP_KERNEL | __GFP_NOWARN);
+	cma_obj->vaddr = dma_alloc_attrs(drm->dev, size, &cma_obj->paddr,
+					 GFP_KERNEL | __GFP_NOWARN,
+					 cma_obj->dma_attrs);
 	if (!cma_obj->vaddr) {
 		dev_dbg(drm->dev, "failed to allocate buffer with size %zu\n",
 			size);
@@ -184,8 +186,9 @@ void drm_gem_cma_free_object(struct drm_gem_object *gem_obj)
 			dma_buf_vunmap(gem_obj->import_attach->dmabuf, cma_obj->vaddr);
 		drm_prime_gem_destroy(gem_obj, cma_obj->sgt);
 	} else if (cma_obj->vaddr) {
-		dma_free_wc(gem_obj->dev->dev, cma_obj->base.size,
-			    cma_obj->vaddr, cma_obj->paddr);
+		dma_free_attrs(gem_obj->dev->dev, cma_obj->base.size,
+			       cma_obj->vaddr, cma_obj->paddr,
+			       cma_obj->dma_attrs);
 	}

 	drm_gem_object_release(gem_obj);
@@ -279,8 +282,9 @@ static int drm_gem_cma_mmap_obj(struct drm_gem_cma_object *cma_obj,
 	vma->vm_flags &= ~VM_PFNMAP;
 	vma->vm_pgoff = 0;

-	ret = dma_mmap_wc(cma_obj->base.dev->dev, vma, cma_obj->vaddr,
-			  cma_obj->paddr, vma->vm_end - vma->vm_start);
+	ret = dma_mmap_attrs(cma_obj->base.dev->dev, vma, cma_obj->vaddr,
+			     cma_obj->paddr, vma->vm_end - vma->vm_start,
+			     cma_obj->dma_attrs);
 	if (ret)
 		drm_gem_vm_close(vma);

@@ -434,8 +438,8 @@ struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj)
 	if (!sgt)
 		return ERR_PTR(-ENOMEM);

-	ret = dma_get_sgtable(obj->dev->dev, sgt, cma_obj->vaddr,
-			      cma_obj->paddr, obj->size);
+	ret = dma_get_sgtable_attrs(obj->dev->dev, sgt, cma_obj->vaddr,
+			      cma_obj->paddr, obj->size, cma_obj->dma_attrs);
 	if (ret < 0)
 		goto out;

diff --git a/include/drm/drm_gem_cma_helper.h b/include/drm/drm_gem_cma_helper.h
index 947ac95eb24a..d042213c3595 100644
--- a/include/drm/drm_gem_cma_helper.h
+++ b/include/drm/drm_gem_cma_helper.h
@@ -24,6 +24,7 @@ struct drm_gem_cma_object {

 	/* For objects with DMA memory allocated by GEM CMA */
 	void *vaddr;
+	unsigned long dma_attrs;
 };

 #define to_drm_gem_cma_obj(gem_obj) \
--
2.20.1