[PATCH v3 2/4] drm/shmem: add support for per object caching flags.

[Gerd Hoffmann <kraxel@redhat.com>]

Use drm_gem_pgprot_wc() as pgprot callback in drm_gem_shmem_funcs.
Use drm_gem_pgprot() to update pgprot caching flags.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/drm_gem_shmem_helper.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index a421a2eed48a..2a662ed77115 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -33,6 +33,7 @@ static const struct drm_gem_object_funcs drm_gem_shmem_funcs = {
 	.vmap = drm_gem_shmem_vmap,
 	.vunmap = drm_gem_shmem_vunmap,
 	.mmap = drm_gem_shmem_mmap,
+	.pgprot = drm_gem_pgprot_wc,
 };
 
 /**
@@ -258,7 +259,7 @@ static void *drm_gem_shmem_vmap_locked(struct drm_gem_shmem_object *shmem)
 		shmem->vaddr = dma_buf_vmap(obj->import_attach->dmabuf);
 	else
 		shmem->vaddr = vmap(shmem->pages, obj->size >> PAGE_SHIFT,
-				    VM_MAP, pgprot_writecombine(PAGE_KERNEL));
+				    VM_MAP, drm_gem_pgprot(obj, PAGE_KERNEL));
 
 	if (!shmem->vaddr) {
 		DRM_DEBUG_KMS("Failed to vmap pages\n");
@@ -540,7 +541,8 @@ int drm_gem_shmem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
 	}
 
 	vma->vm_flags |= VM_MIXEDMAP | VM_DONTEXPAND;
-	vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+	vma->vm_page_prot = drm_gem_pgprot(obj, vma->vm_page_prot);
 	vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
 	vma->vm_ops = &drm_gem_shmem_vm_ops;
 
-- 
2.18.1