drm/exynos: Implement mmap as GEM object function

Moving the driver-specific mmap code into a GEM object function allows
for using DRM helpers for various mmap callbacks.

The respective exynos functions are being removed. The file_operations
structure exynos_drm_driver_fops is now being created by the helper macro
DEFINE_DRM_GEM_FOPS().

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Fixed merge conflict.
Signed-off-by: Inki Dae <inki.dae@samsung.com>

Author: tdz

drivers/gpu/drm/exynos/exynos_drm_drv.c

@@ -102,16 +102,7 @@ static const struct drm_ioctl_desc exynos_ioctls[] = {
 			DRM_RENDER_ALLOW),
 };
 
-static const struct file_operations exynos_drm_driver_fops = {
-	.owner		= THIS_MODULE,
-	.open		= drm_open,
-	.mmap		= exynos_drm_gem_mmap,
-	.poll		= drm_poll,
-	.read		= drm_read,
-	.unlocked_ioctl	= drm_ioctl,
-	.compat_ioctl = drm_compat_ioctl,
-	.release	= drm_release,
-};
+DEFINE_DRM_GEM_FOPS(exynos_drm_driver_fops);
 
 static const struct drm_driver exynos_drm_driver = {
 	.driver_features	= DRIVER_MODESET | DRIVER_GEM
@@ -124,7 +115,7 @@ static const struct drm_driver exynos_drm_driver = {
 	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
 	.gem_prime_import	= exynos_drm_gem_prime_import,
 	.gem_prime_import_sg_table	= exynos_drm_gem_prime_import_sg_table,
-	.gem_prime_mmap		= exynos_drm_gem_prime_mmap,
+	.gem_prime_mmap		= drm_gem_prime_mmap,
 	.ioctls			= exynos_ioctls,
 	.num_ioctls		= ARRAY_SIZE(exynos_ioctls),
 	.fops			= &exynos_drm_driver_fops,

drivers/gpu/drm/exynos/exynos_drm_fbdev.c

@@ -15,6 +15,7 @@
 #include <drm/drm_crtc.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_fourcc.h>
+#include <drm/drm_prime.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/exynos_drm.h>
 
@@ -39,25 +40,8 @@ static int exynos_drm_fb_mmap(struct fb_info *info,
 	struct drm_fb_helper *helper = info->par;
 	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
 	struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
-	unsigned long vm_size;
-	int ret;
-
-	vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
-
-	vm_size = vma->vm_end - vma->vm_start;
-
-	if (vm_size > exynos_gem->size)
-		return -EINVAL;
 
-	ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie,
-			     exynos_gem->dma_addr, exynos_gem->size,
-			     exynos_gem->dma_attrs);
-	if (ret < 0) {
-		DRM_DEV_ERROR(to_dma_dev(helper->dev), "failed to mmap.\n");
-		return ret;
-	}
-
-	return 0;
+	return drm_gem_prime_mmap(&exynos_gem->base, vma);
 }
 
 static const struct fb_ops exynos_drm_fb_ops = {

drivers/gpu/drm/exynos/exynos_drm_gem.c

@@ -20,6 +20,8 @@
 
 MODULE_IMPORT_NS(DMA_BUF);
 
+static int exynos_drm_gem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);
+
 static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem, bool kvmap)
 {
 	struct drm_device *dev = exynos_gem->base.dev;
@@ -138,6 +140,7 @@ static const struct vm_operations_struct exynos_drm_gem_vm_ops = {
 static const struct drm_gem_object_funcs exynos_drm_gem_object_funcs = {
 	.free = exynos_drm_gem_free_object,
 	.get_sg_table = exynos_drm_gem_prime_get_sg_table,
+	.mmap = exynos_drm_gem_mmap,
 	.vm_ops = &exynos_drm_gem_vm_ops,
 };
 
@@ -357,12 +360,16 @@ int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
 	return 0;
 }
 
-static int exynos_drm_gem_mmap_obj(struct drm_gem_object *obj,
-				   struct vm_area_struct *vma)
+static int exynos_drm_gem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
 {
 	struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
 	int ret;
 
+	if (obj->import_attach)
+		return dma_buf_mmap(obj->dma_buf, vma, 0);
+
+	vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
+
 	DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "flags = 0x%x\n",
 			  exynos_gem->flags);
 
@@ -388,26 +395,6 @@ static int exynos_drm_gem_mmap_obj(struct drm_gem_object *obj,
 	return ret;
 }
 
-int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
-{
-	struct drm_gem_object *obj;
-	int ret;
-
-	/* set vm_area_struct. */
-	ret = drm_gem_mmap(filp, vma);
-	if (ret < 0) {
-		DRM_ERROR("failed to mmap.\n");
-		return ret;
-	}
-
-	obj = vma->vm_private_data;
-
-	if (obj->import_attach)
-		return dma_buf_mmap(obj->dma_buf, vma, 0);
-
-	return exynos_drm_gem_mmap_obj(obj, vma);
-}
-
 /* low-level interface prime helpers */
 struct drm_gem_object *exynos_drm_gem_prime_import(struct drm_device *dev,
 					    struct dma_buf *dma_buf)
@@ -469,15 +456,3 @@ exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
 	exynos_gem->sgt = sgt;
 	return &exynos_gem->base;
 }
-
-int exynos_drm_gem_prime_mmap(struct drm_gem_object *obj,
-			      struct vm_area_struct *vma)
-{
-	int ret;
-
-	ret = drm_gem_mmap_obj(obj, obj->size, vma);
-	if (ret < 0)
-		return ret;
-
-	return exynos_drm_gem_mmap_obj(obj, vma);
-}

drivers/gpu/drm/exynos/exynos_drm_gem.h

@@ -96,9 +96,6 @@ int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
 			       struct drm_device *dev,
 			       struct drm_mode_create_dumb *args);
 
-/* set vm_flags and we can change the vm attribute to other one at here. */
-int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
-
 /* low-level interface prime helpers */
 struct drm_gem_object *exynos_drm_gem_prime_import(struct drm_device *dev,
 					    struct dma_buf *dma_buf);
@@ -107,7 +104,5 @@ struct drm_gem_object *
 exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
 				     struct dma_buf_attachment *attach,
 				     struct sg_table *sgt);
-int exynos_drm_gem_prime_mmap(struct drm_gem_object *obj,
-			      struct vm_area_struct *vma);
 
 #endif