drm/nouveau: use prime helpers

Simplify the Nouveau prime implementation by using the default behavior provided
by drm_gem_prime_import and drm_gem_prime_export.

v2: Rename functions to nouveau_gem_prime_get_sg_table and
nouveau_gem_prime_import_sg_table.
Signed-off-by: Aaron Plattner <aplattner@nvidia.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: David Airlie <airlied@linux.ie>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/nouveau/nouveau_bo.h

@@ -33,7 +33,6 @@ struct nouveau_bo {
 	int pin_refcnt;
 
 	struct ttm_bo_kmap_obj dma_buf_vmap;
-	int vmapping_count;
 };
 
 static inline struct nouveau_bo *

drivers/gpu/drm/nouveau/nouveau_drm.c

@@ -650,8 +650,13 @@ driver = {
 
 	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
-	.gem_prime_export = nouveau_gem_prime_export,
-	.gem_prime_import = nouveau_gem_prime_import,
+	.gem_prime_export = drm_gem_prime_export,
+	.gem_prime_import = drm_gem_prime_import,
+	.gem_prime_pin = nouveau_gem_prime_pin,
+	.gem_prime_get_sg_table = nouveau_gem_prime_get_sg_table,
+	.gem_prime_import_sg_table = nouveau_gem_prime_import_sg_table,
+	.gem_prime_vmap = nouveau_gem_prime_vmap,
+	.gem_prime_vunmap = nouveau_gem_prime_vunmap,
 
 	.gem_init_object = nouveau_gem_object_new,
 	.gem_free_object = nouveau_gem_object_del,

drivers/gpu/drm/nouveau/nouveau_gem.c

@@ -24,8 +24,6 @@
  *
  */
 
-#include <linux/dma-buf.h>
-
 #include <subdev/fb.h>
 
 #include "nouveau_drm.h"

drivers/gpu/drm/nouveau/nouveau_gem.h

@@ -35,9 +35,11 @@ extern int nouveau_gem_ioctl_cpu_fini(struct drm_device *, void *,
 extern int nouveau_gem_ioctl_info(struct drm_device *, void *,
 				  struct drm_file *);
 
-extern struct dma_buf *nouveau_gem_prime_export(struct drm_device *dev,
-				struct drm_gem_object *obj, int flags);
-extern struct drm_gem_object *nouveau_gem_prime_import(struct drm_device *dev,
-				struct dma_buf *dma_buf);
+extern int nouveau_gem_prime_pin(struct drm_gem_object *);
+extern struct sg_table *nouveau_gem_prime_get_sg_table(struct drm_gem_object *);
+extern struct drm_gem_object *nouveau_gem_prime_import_sg_table(
+	struct drm_device *, size_t size, struct sg_table *);
+extern void *nouveau_gem_prime_vmap(struct drm_gem_object *);
+extern void nouveau_gem_prime_vunmap(struct drm_gem_object *, void *);
 
 #endif

drivers/gpu/drm/nouveau/nouveau_prime.c

@@ -22,126 +22,42 @@
  * Authors: Dave Airlie
  */
 
-#include <linux/dma-buf.h>
-
 #include <drm/drmP.h>
 
 #include "nouveau_drm.h"
 #include "nouveau_gem.h"
 
-static struct sg_table *nouveau_gem_map_dma_buf(struct dma_buf_attachment *attachment,
-					  enum dma_data_direction dir)
+struct sg_table *nouveau_gem_prime_get_sg_table(struct drm_gem_object *obj)
 {
-	struct nouveau_bo *nvbo = attachment->dmabuf->priv;
-	struct drm_device *dev = nvbo->gem->dev;
+	struct nouveau_bo *nvbo = nouveau_gem_object(obj);
 	int npages = nvbo->bo.num_pages;
-	struct sg_table *sg;
-	int nents;
-
-	mutex_lock(&dev->struct_mutex);
-	sg = drm_prime_pages_to_sg(nvbo->bo.ttm->pages, npages);
-	nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir);
-	mutex_unlock(&dev->struct_mutex);
-	return sg;
-}
-
-static void nouveau_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
-				      struct sg_table *sg, enum dma_data_direction dir)
-{
-	dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir);
-	sg_free_table(sg);
-	kfree(sg);
-}
-
-static void nouveau_gem_dmabuf_release(struct dma_buf *dma_buf)
-{
-	struct nouveau_bo *nvbo = dma_buf->priv;
-
-	if (nvbo->gem->export_dma_buf == dma_buf) {
-		nvbo->gem->export_dma_buf = NULL;
-		drm_gem_object_unreference_unlocked(nvbo->gem);
-	}
-}
-
-static void *nouveau_gem_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num)
-{
-	return NULL;
-}
-
-static void nouveau_gem_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
-{
 
-}
-static void *nouveau_gem_kmap(struct dma_buf *dma_buf, unsigned long page_num)
-{
-	return NULL;
+	return drm_prime_pages_to_sg(nvbo->bo.ttm->pages, npages);
 }
 
-static void nouveau_gem_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
+void *nouveau_gem_prime_vmap(struct drm_gem_object *obj)
 {
-
-}
-
-static int nouveau_gem_prime_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
-{
-	return -EINVAL;
-}
-
-static void *nouveau_gem_prime_vmap(struct dma_buf *dma_buf)
-{
-	struct nouveau_bo *nvbo = dma_buf->priv;
-	struct drm_device *dev = nvbo->gem->dev;
+	struct nouveau_bo *nvbo = nouveau_gem_object(obj);
 	int ret;
 
-	mutex_lock(&dev->struct_mutex);
-	if (nvbo->vmapping_count) {
-		nvbo->vmapping_count++;
-		goto out_unlock;
-	}
-
 	ret = ttm_bo_kmap(&nvbo->bo, 0, nvbo->bo.num_pages,
 			  &nvbo->dma_buf_vmap);
-	if (ret) {
-		mutex_unlock(&dev->struct_mutex);
+	if (ret)
 		return ERR_PTR(ret);
-	}
-	nvbo->vmapping_count = 1;
-out_unlock:
-	mutex_unlock(&dev->struct_mutex);
+
 	return nvbo->dma_buf_vmap.virtual;
 }
 
-static void nouveau_gem_prime_vunmap(struct dma_buf *dma_buf, void *vaddr)
+void nouveau_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
 {
-	struct nouveau_bo *nvbo = dma_buf->priv;
-	struct drm_device *dev = nvbo->gem->dev;
+	struct nouveau_bo *nvbo = nouveau_gem_object(obj);
 
-	mutex_lock(&dev->struct_mutex);
-	nvbo->vmapping_count--;
-	if (nvbo->vmapping_count == 0) {
-		ttm_bo_kunmap(&nvbo->dma_buf_vmap);
-	}
-	mutex_unlock(&dev->struct_mutex);
+	ttm_bo_kunmap(&nvbo->dma_buf_vmap);
 }
 
-static const struct dma_buf_ops nouveau_dmabuf_ops =  {
-	.map_dma_buf = nouveau_gem_map_dma_buf,
-	.unmap_dma_buf = nouveau_gem_unmap_dma_buf,
-	.release = nouveau_gem_dmabuf_release,
-	.kmap = nouveau_gem_kmap,
-	.kmap_atomic = nouveau_gem_kmap_atomic,
-	.kunmap = nouveau_gem_kunmap,
-	.kunmap_atomic = nouveau_gem_kunmap_atomic,
-	.mmap = nouveau_gem_prime_mmap,
-	.vmap = nouveau_gem_prime_vmap,
-	.vunmap = nouveau_gem_prime_vunmap,
-};
-
-static int
-nouveau_prime_new(struct drm_device *dev,
-		  size_t size,
-		  struct sg_table *sg,
-		  struct nouveau_bo **pnvbo)
+struct drm_gem_object *nouveau_gem_prime_import_sg_table(struct drm_device *dev,
+							 size_t size,
+							 struct sg_table *sg)
 {
 	struct nouveau_bo *nvbo;
 	u32 flags = 0;
@@ -150,24 +66,22 @@ nouveau_prime_new(struct drm_device *dev,
 	flags = TTM_PL_FLAG_TT;
 
 	ret = nouveau_bo_new(dev, size, 0, flags, 0, 0,
-			     sg, pnvbo);
+			     sg, &nvbo);
 	if (ret)
-		return ret;
-	nvbo = *pnvbo;
+		return ERR_PTR(ret);
 
 	nvbo->valid_domains = NOUVEAU_GEM_DOMAIN_GART;
 	nvbo->gem = drm_gem_object_alloc(dev, nvbo->bo.mem.size);
 	if (!nvbo->gem) {
-		nouveau_bo_ref(NULL, pnvbo);
-		return -ENOMEM;
+		nouveau_bo_ref(NULL, &nvbo);
+		return ERR_PTR(-ENOMEM);
 	}
 
 	nvbo->gem->driver_private = nvbo;
-	return 0;
+	return nvbo->gem;
 }
 
-struct dma_buf *nouveau_gem_prime_export(struct drm_device *dev,
-				struct drm_gem_object *obj, int flags)
+int nouveau_gem_prime_pin(struct drm_gem_object *obj)
 {
 	struct nouveau_bo *nvbo = nouveau_gem_object(obj);
 	int ret = 0;
@@ -175,52 +89,7 @@ struct dma_buf *nouveau_gem_prime_export(struct drm_device *dev,
 	/* pin buffer into GTT */
 	ret = nouveau_bo_pin(nvbo, TTM_PL_FLAG_TT);
 	if (ret)
-		return ERR_PTR(-EINVAL);
-
-	return dma_buf_export(nvbo, &nouveau_dmabuf_ops, obj->size, flags);
-}
-
-struct drm_gem_object *nouveau_gem_prime_import(struct drm_device *dev,
-				struct dma_buf *dma_buf)
-{
-	struct dma_buf_attachment *attach;
-	struct sg_table *sg;
-	struct nouveau_bo *nvbo;
-	int ret;
-
-	if (dma_buf->ops == &nouveau_dmabuf_ops) {
-		nvbo = dma_buf->priv;
-		if (nvbo->gem) {
-			if (nvbo->gem->dev == dev) {
-				drm_gem_object_reference(nvbo->gem);
-				dma_buf_put(dma_buf);
-				return nvbo->gem;
-			}
-		}
-	}
-	/* need to attach */
-	attach = dma_buf_attach(dma_buf, dev->dev);
-	if (IS_ERR(attach))
-		return ERR_PTR(PTR_ERR(attach));
-
-	sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
-	if (IS_ERR(sg)) {
-		ret = PTR_ERR(sg);
-		goto fail_detach;
-	}
-
-	ret = nouveau_prime_new(dev, dma_buf->size, sg, &nvbo);
-	if (ret)
-		goto fail_unmap;
-
-	nvbo->gem->import_attach = attach;
-
-	return nvbo->gem;
+		return -EINVAL;
 
-fail_unmap:
-	dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
-fail_detach:
-	dma_buf_detach(dma_buf, attach);
-	return ERR_PTR(ret);
+	return 0;
 }
-