linux-kernel - [PATCH v3 4/4] drm/udl: simplify gem object mapping.

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Message-Id: <20191211121957.18637-5-kraxel@redhat.com>
Date:   Wed, 11 Dec 2019 13:19:56 +0100
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     tzimmermann@...e.de, gurchetansingh@...omium.org,
        Gerd Hoffmann <kraxel@...hat.com>,
        Dave Airlie <airlied@...hat.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v3 4/4] drm/udl: simplify gem object mapping.

With shmem helpers allowing to update pgprot caching flags via
drm_gem_object_funcs.pgprot we can just use that and ditch our own
implementations of mmap() and vmap().

Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
---
 drivers/gpu/drm/udl/udl_gem.c | 62 ++++-------------------------------
 1 file changed, 7 insertions(+), 55 deletions(-)

diff --git a/drivers/gpu/drm/udl/udl_gem.c b/drivers/gpu/drm/udl/udl_gem.c
index b6e26f98aa0a..b82a4a921f1b 100644
--- a/drivers/gpu/drm/udl/udl_gem.c
+++ b/drivers/gpu/drm/udl/udl_gem.c
@@ -17,61 +17,12 @@
  * GEM object funcs
  */
 
-static int udl_gem_object_mmap(struct drm_gem_object *obj,
-			       struct vm_area_struct *vma)
+static pgprot_t udl_gem_object_pgprot(struct drm_gem_object *obj,
+				      pgprot_t pgprot)
 {
-	int ret;
-
-	ret = drm_gem_shmem_mmap(obj, vma);
-	if (ret)
-		return ret;
-
-	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
 	if (obj->import_attach)
-		vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
-	vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
-
-	return 0;
-}
-
-static void *udl_gem_object_vmap(struct drm_gem_object *obj)
-{
-	struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
-	int ret;
-
-	ret = mutex_lock_interruptible(&shmem->vmap_lock);
-	if (ret)
-		return ERR_PTR(ret);
-
-	if (shmem->vmap_use_count++ > 0)
-		goto out;
-
-	ret = drm_gem_shmem_get_pages(shmem);
-	if (ret)
-		goto err_zero_use;
-
-	if (obj->import_attach)
-		shmem->vaddr = dma_buf_vmap(obj->import_attach->dmabuf);
-	else
-		shmem->vaddr = vmap(shmem->pages, obj->size >> PAGE_SHIFT,
-				    VM_MAP, PAGE_KERNEL);
-
-	if (!shmem->vaddr) {
-		DRM_DEBUG_KMS("Failed to vmap pages\n");
-		ret = -ENOMEM;
-		goto err_put_pages;
-	}
-
-out:
-	mutex_unlock(&shmem->vmap_lock);
-	return shmem->vaddr;
-
-err_put_pages:
-	drm_gem_shmem_put_pages(shmem);
-err_zero_use:
-	shmem->vmap_use_count = 0;
-	mutex_unlock(&shmem->vmap_lock);
-	return ERR_PTR(ret);
+		pgprot = pgprot_writecombine(pgprot);
+	return pgprot;
 }
 
 static const struct drm_gem_object_funcs udl_gem_object_funcs = {
@@ -80,9 +31,10 @@ static const struct drm_gem_object_funcs udl_gem_object_funcs = {
 	.pin = drm_gem_shmem_pin,
 	.unpin = drm_gem_shmem_unpin,
 	.get_sg_table = drm_gem_shmem_get_sg_table,
-	.vmap = udl_gem_object_vmap,
+	.vmap = drm_gem_shmem_vmap,
 	.vunmap = drm_gem_shmem_vunmap,
-	.mmap = udl_gem_object_mmap,
+	.mmap = drm_gem_shmem_mmap,
+	.pgprot = udl_gem_object_pgprot,
 };
 
 /*
-- 
2.18.1