[PATCH 1/5] drm/prime: Remove duplicate forward declaration

[PATCH 1/5] drm/prime: Remove duplicate forward declaration

[Thierry Reding]

From: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

struct device is forward-declared twice. Remove the second instance.

Reviewed-by: Chris Wilson <chris-Y6uKTt2uX1cEflXRtASbqLVCufUGDwFn@public.gmane.org>
Signed-off-by: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
 include/drm/drm_prime.h | 2 --
 1 file changed, 2 deletions(-)

diff --git a/include/drm/drm_prime.h b/include/drm/drm_prime.h
index 9cd9e36f77b5..59ccab402e85 100644
--- a/include/drm/drm_prime.h
+++ b/include/drm/drm_prime.h
@@ -59,8 +59,6 @@ struct drm_device;
 struct drm_gem_object;
 struct drm_file;
 
-struct device;
-
 struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
 				     struct drm_gem_object *obj,
 				     int flags);
-- 
2.15.1

[PATCH 2/5] drm/prime: Export more helpers for drivers

[Thierry Reding]

From: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

Export some more of the helpers in order to allow drivers to more fine-
grainedly select which helpers to use. This gives drivers an easy way to
reuse a lot of the code in the helpers while at the same time allowing
them to provide their own implementation for other functions in struct
dma_buf_ops.

Signed-off-by: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
 drivers/gpu/drm/drm_prime.c | 23 +++++++++++++----------
 include/drm/drm_prime.h     | 12 ++++++++++++
 2 files changed, 25 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index 9a17725b0f7a..f9903e6b59f6 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -180,9 +180,8 @@ static int drm_prime_lookup_buf_handle(struct drm_prime_file_private *prime_fpri
 	return -ENOENT;
 }
 
-static int drm_gem_map_attach(struct dma_buf *dma_buf,
-			      struct device *target_dev,
-			      struct dma_buf_attachment *attach)
+int drm_gem_map_attach(struct dma_buf *dma_buf, struct device *target_dev,
+		       struct dma_buf_attachment *attach)
 {
 	struct drm_prime_attachment *prime_attach;
 	struct drm_gem_object *obj = dma_buf->priv;
@@ -200,9 +199,10 @@ static int drm_gem_map_attach(struct dma_buf *dma_buf,
 
 	return dev->driver->gem_prime_pin(obj);
 }
+EXPORT_SYMBOL(drm_gem_map_attach);
 
-static void drm_gem_map_detach(struct dma_buf *dma_buf,
-			       struct dma_buf_attachment *attach)
+void drm_gem_map_detach(struct dma_buf *dma_buf,
+			struct dma_buf_attachment *attach)
 {
 	struct drm_prime_attachment *prime_attach = attach->priv;
 	struct drm_gem_object *obj = dma_buf->priv;
@@ -228,6 +228,7 @@ static void drm_gem_map_detach(struct dma_buf *dma_buf,
 	kfree(prime_attach);
 	attach->priv = NULL;
 }
+EXPORT_SYMBOL(drm_gem_map_detach);
 
 void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpriv,
 					struct dma_buf *dma_buf)
@@ -254,8 +255,8 @@ void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpr
 	}
 }
 
-static struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
-					    enum dma_data_direction dir)
+struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
+				     enum dma_data_direction dir)
 {
 	struct drm_prime_attachment *prime_attach = attach->priv;
 	struct drm_gem_object *obj = attach->dmabuf->priv;
@@ -291,13 +292,15 @@ static struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
 
 	return sgt;
 }
+EXPORT_SYMBOL(drm_gem_map_dma_buf);
 
-static void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
-				  struct sg_table *sgt,
-				  enum dma_data_direction dir)
+void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
+			   struct sg_table *sgt,
+			   enum dma_data_direction dir)
 {
 	/* nothing to be done here */
 }
+EXPORT_SYMBOL(drm_gem_unmap_dma_buf);
 
 /**
  * drm_gem_dmabuf_export - dma_buf export implementation for GEM
diff --git a/include/drm/drm_prime.h b/include/drm/drm_prime.h
index 59ccab402e85..3a9706815773 100644
--- a/include/drm/drm_prime.h
+++ b/include/drm/drm_prime.h
@@ -50,8 +50,10 @@ struct drm_prime_file_private {
 	struct rb_root handles;
 };
 
+enum dma_data_direction;
 struct device;
 
+struct dma_buf_attachment;
 struct dma_buf_export_info;
 struct dma_buf;
 
@@ -59,6 +61,16 @@ struct drm_device;
 struct drm_gem_object;
 struct drm_file;
 
+int drm_gem_map_attach(struct dma_buf *dma_buf, struct device *target_dev,
+		       struct dma_buf_attachment *attach);
+void drm_gem_map_detach(struct dma_buf *dma_buf,
+			struct dma_buf_attachment *attach);
+struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
+				     enum dma_data_direction dir);
+void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
+			   struct sg_table *sgt,
+			   enum dma_data_direction dir);
+
 struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
 				     struct drm_gem_object *obj,
 				     int flags);
-- 
2.15.1

[PATCH 3/5] drm/nouveau: Provide custom struct dma_buf_ops

[Thierry Reding]

From: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

Instead of relying on the DRM PRIME helpers to provide all of the
DMA-BUF operations, provide a custom version of struct dma_buf_ops to
allow additional functionality to be implemented.

Signed-off-by: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
 drivers/gpu/drm/nouveau/nouveau_drm.c   |   9 +-
 drivers/gpu/drm/nouveau/nouveau_gem.h   |  15 +--
 drivers/gpu/drm/nouveau/nouveau_prime.c | 157 +++++++++++++++++++++++++-------
 3 files changed, 135 insertions(+), 46 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
index 56fe261b6268..3ce2f02e9e58 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -1081,15 +1081,12 @@ driver_stub = {
 
 	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
-	.gem_prime_export = drm_gem_prime_export,
-	.gem_prime_import = drm_gem_prime_import,
+	.gem_prime_export = nouveau_gem_prime_export,
+	.gem_prime_import = nouveau_gem_prime_import,
 	.gem_prime_pin = nouveau_gem_prime_pin,
-	.gem_prime_res_obj = nouveau_gem_prime_res_obj,
 	.gem_prime_unpin = nouveau_gem_prime_unpin,
+	.gem_prime_res_obj = nouveau_gem_prime_res_obj,
 	.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_free_object_unlocked = nouveau_gem_object_del,
 	.gem_open_object = nouveau_gem_object_open,
diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.h b/drivers/gpu/drm/nouveau/nouveau_gem.h
index fe39998f65cc..eb55c1eb1d9f 100644
--- a/drivers/gpu/drm/nouveau/nouveau_gem.h
+++ b/drivers/gpu/drm/nouveau/nouveau_gem.h
@@ -32,13 +32,14 @@ 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 int nouveau_gem_prime_pin(struct drm_gem_object *);
+struct dma_buf *nouveau_gem_prime_export(struct drm_device *dev,
+					 struct drm_gem_object *obj,
+					 int flags);
+struct drm_gem_object *nouveau_gem_prime_import(struct drm_device *drm,
+						struct dma_buf *buf);
+int nouveau_gem_prime_pin(struct drm_gem_object *obj);
+void nouveau_gem_prime_unpin(struct drm_gem_object *obj);
 struct reservation_object *nouveau_gem_prime_res_obj(struct drm_gem_object *);
-extern void nouveau_gem_prime_unpin(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 *, struct dma_buf_attachment *, struct sg_table *);
-extern void *nouveau_gem_prime_vmap(struct drm_gem_object *);
-extern void nouveau_gem_prime_vunmap(struct drm_gem_object *, void *);
+struct sg_table *nouveau_gem_prime_get_sg_table(struct drm_gem_object *obj);
 
 #endif
diff --git a/drivers/gpu/drm/nouveau/nouveau_prime.c b/drivers/gpu/drm/nouveau/nouveau_prime.c
index 1fefc93af1d7..63cf4aca2d8e 100644
--- a/drivers/gpu/drm/nouveau/nouveau_prime.c
+++ b/drivers/gpu/drm/nouveau/nouveau_prime.c
@@ -23,69 +23,152 @@
  */
 
 #include <drm/drmP.h>
+#include <drm/drm_legacy.h>
 #include <linux/dma-buf.h>
 
 #include "nouveau_drv.h"
 #include "nouveau_gem.h"
 
-struct sg_table *nouveau_gem_prime_get_sg_table(struct drm_gem_object *obj)
+static void *nouveau_gem_prime_kmap_atomic(struct dma_buf *buf,
+					   unsigned long page)
 {
-	struct nouveau_bo *nvbo = nouveau_gem_object(obj);
-	int npages = nvbo->bo.num_pages;
+	return NULL;
+}
 
-	return drm_prime_pages_to_sg(nvbo->bo.ttm->pages, npages);
+static void nouveau_gem_prime_kunmap_atomic(struct dma_buf *buf,
+					    unsigned long page, void *addr)
+{
 }
 
-void *nouveau_gem_prime_vmap(struct drm_gem_object *obj)
+static void *nouveau_gem_prime_kmap(struct dma_buf *buf, unsigned long page)
 {
-	struct nouveau_bo *nvbo = nouveau_gem_object(obj);
+	return NULL;
+}
+
+static void nouveau_gem_prime_kunmap(struct dma_buf *buf, unsigned long page,
+				     void *addr)
+{
+}
+
+static void *nouveau_gem_prime_vmap(struct dma_buf *buf)
+{
+	struct nouveau_bo *bo = nouveau_gem_object(buf->priv);
 	int ret;
 
-	ret = ttm_bo_kmap(&nvbo->bo, 0, nvbo->bo.num_pages,
-			  &nvbo->dma_buf_vmap);
+	ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->dma_buf_vmap);
 	if (ret)
 		return ERR_PTR(ret);
 
-	return nvbo->dma_buf_vmap.virtual;
+	return bo->dma_buf_vmap.virtual;
 }
 
-void nouveau_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
+static void nouveau_gem_prime_vunmap(struct dma_buf *buf, void *vaddr)
 {
-	struct nouveau_bo *nvbo = nouveau_gem_object(obj);
+	struct nouveau_bo *bo = nouveau_gem_object(buf->priv);
+
+	ttm_bo_kunmap(&bo->dma_buf_vmap);
+}
+
+static const struct dma_buf_ops nouveau_gem_prime_dmabuf_ops = {
+	.attach = drm_gem_map_attach,
+	.detach = drm_gem_map_detach,
+	.map_dma_buf = drm_gem_map_dma_buf,
+	.unmap_dma_buf = drm_gem_unmap_dma_buf,
+	.release = drm_gem_dmabuf_release,
+	.map_atomic = nouveau_gem_prime_kmap_atomic,
+	.unmap_atomic = nouveau_gem_prime_kunmap_atomic,
+	.map = nouveau_gem_prime_kmap,
+	.unmap = nouveau_gem_prime_kunmap,
+	.vmap = nouveau_gem_prime_vmap,
+	.vunmap = nouveau_gem_prime_vunmap,
+};
+
+struct dma_buf *nouveau_gem_prime_export(struct drm_device *dev,
+					 struct drm_gem_object *obj,
+					 int flags)
+{
+	DEFINE_DMA_BUF_EXPORT_INFO(info);
+
+	info.exp_name = KBUILD_MODNAME;
+	info.owner = dev->driver->fops->owner;
+	info.ops = &nouveau_gem_prime_dmabuf_ops;
+	info.size = obj->size;
+	info.flags = flags;
+	info.priv = obj;
+
+	if (dev->driver->gem_prime_res_obj)
+		info.resv = dev->driver->gem_prime_res_obj(obj);
 
-	ttm_bo_kunmap(&nvbo->dma_buf_vmap);
+	return drm_gem_dmabuf_export(dev, &info);
 }
 
-struct drm_gem_object *nouveau_gem_prime_import_sg_table(struct drm_device *dev,
-							 struct dma_buf_attachment *attach,
-							 struct sg_table *sg)
+struct drm_gem_object *nouveau_gem_prime_import(struct drm_device *dev,
+						struct dma_buf *buf)
 {
 	struct nouveau_drm *drm = nouveau_drm(dev);
-	struct nouveau_bo *nvbo;
-	struct reservation_object *robj = attach->dmabuf->resv;
-	u32 flags = 0;
+	struct dma_buf_attachment *attach;
+	struct drm_gem_object *obj;
+	u32 flags = TTM_PL_FLAG_TT;
+	struct nouveau_bo *bo;
+	struct sg_table *sgt;
 	int ret;
 
-	flags = TTM_PL_FLAG_TT;
+	if (buf->ops == &nouveau_gem_prime_dmabuf_ops) {
+		obj = buf->priv;
+
+		if (obj->dev == dev) {
+			/*
+			 * Importing a DMA-BUF exported from our own GEM
+			 * increases the reference count on the GEM itself
+			 * instead of the f_count of the DMA-BUF.
+			 */
+			drm_gem_object_get(obj);
+			return obj;
+		}
+	}
 
-	ww_mutex_lock(&robj->lock, NULL);
-	ret = nouveau_bo_new(&drm->client, attach->dmabuf->size, 0, flags, 0, 0,
-			     sg, robj, &nvbo);
-	ww_mutex_unlock(&robj->lock);
-	if (ret)
-		return ERR_PTR(ret);
+	attach = dma_buf_attach(buf, dev->dev);
+	if (IS_ERR(attach))
+		return ERR_CAST(attach);
 
-	nvbo->valid_domains = NOUVEAU_GEM_DOMAIN_GART;
+	get_dma_buf(buf);
 
-	/* Initialize the embedded gem-object. We return a single gem-reference
-	 * to the caller, instead of a normal nouveau_bo ttm reference. */
-	ret = drm_gem_object_init(dev, &nvbo->gem, nvbo->bo.mem.size);
-	if (ret) {
-		nouveau_bo_ref(NULL, &nvbo);
-		return ERR_PTR(-ENOMEM);
+	sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
+	if (IS_ERR(sgt)) {
+		ret = PTR_ERR(sgt);
+		goto detach;
 	}
 
-	return &nvbo->gem;
+	ww_mutex_lock(&attach->dmabuf->resv->lock, NULL);
+	ret = nouveau_bo_new(&drm->client, attach->dmabuf->size, 0, flags, 0,
+			     0, sgt, attach->dmabuf->resv, &bo);
+	ww_mutex_unlock(&attach->dmabuf->resv->lock);
+	if (ret)
+		goto unmap;
+
+	bo->valid_domains = NOUVEAU_GEM_DOMAIN_GART;
+
+	/*
+	 * Initialize the embedded GEM object. We return a single GEM reference
+	 * to the caller, instead of a normal nouveau_bo TTM reference.
+	 */
+	ret = drm_gem_object_init(dev, &bo->gem, bo->bo.mem.size);
+	if (ret)
+		goto unref;
+
+	bo->gem.import_attach = attach;
+
+	return &bo->gem;
+
+unref:
+	nouveau_bo_ref(NULL, &bo);
+unmap:
+	dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL);
+detach:
+	dma_buf_detach(buf, attach);
+	dma_buf_put(buf);
+
+	return ERR_PTR(ret);
 }
 
 int nouveau_gem_prime_pin(struct drm_gem_object *obj)
@@ -114,3 +197,11 @@ struct reservation_object *nouveau_gem_prime_res_obj(struct drm_gem_object *obj)
 
 	return nvbo->bo.resv;
 }
+
+struct sg_table *nouveau_gem_prime_get_sg_table(struct drm_gem_object *obj)
+{
+	struct nouveau_bo *nvbo = nouveau_gem_object(obj);
+	int npages = nvbo->bo.num_pages;
+
+	return drm_prime_pages_to_sg(nvbo->bo.ttm->pages, npages);
+}
-- 
2.15.1

[PATCH 4/5] drm/nouveau: prime: Implement mmap()

[Thierry Reding]

From: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

Provide an implementation of mmap() for PRIME exported buffers. This
allows userspace to map these buffers and access them using the CPU.

Signed-off-by: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
 drivers/gpu/drm/nouveau/nouveau_prime.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/drivers/gpu/drm/nouveau/nouveau_prime.c b/drivers/gpu/drm/nouveau/nouveau_prime.c
index 63cf4aca2d8e..5d885d7cb059 100644
--- a/drivers/gpu/drm/nouveau/nouveau_prime.c
+++ b/drivers/gpu/drm/nouveau/nouveau_prime.c
@@ -50,6 +50,37 @@ static void nouveau_gem_prime_kunmap(struct dma_buf *buf, unsigned long page,
 {
 }
 
+static inline u64 nouveau_bo_mmap_offset(struct nouveau_bo *bo)
+{
+	return drm_vma_node_offset_addr(&bo->bo.vma_node) >> PAGE_SHIFT;
+}
+
+static int nouveau_gem_prime_mmap(struct dma_buf *buf,
+				  struct vm_area_struct *vma)
+{
+	struct nouveau_bo *bo = nouveau_gem_object(buf->priv);
+	struct drm_gem_object *obj = buf->priv;
+	int ret;
+
+	/* check for valid size */
+	if (obj->size < vma->vm_end - vma->vm_start)
+		return -EINVAL;
+
+	vma->vm_pgoff += nouveau_bo_mmap_offset(bo);
+
+	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
+		return drm_legacy_mmap(vma->vm_file, vma);
+
+	ret = drm_vma_node_allow(&obj->vma_node, vma->vm_file->private_data);
+	if (ret)
+		return ret;
+
+	ret = ttm_bo_mmap(vma->vm_file, vma, bo->bo.bdev);
+	drm_vma_node_revoke(&obj->vma_node, vma->vm_file->private_data);
+
+	return ret;
+}
+
 static void *nouveau_gem_prime_vmap(struct dma_buf *buf)
 {
 	struct nouveau_bo *bo = nouveau_gem_object(buf->priv);
@@ -79,6 +110,7 @@ static const struct dma_buf_ops nouveau_gem_prime_dmabuf_ops = {
 	.unmap_atomic = nouveau_gem_prime_kunmap_atomic,
 	.map = nouveau_gem_prime_kmap,
 	.unmap = nouveau_gem_prime_kunmap,
+	.mmap = nouveau_gem_prime_mmap,
 	.vmap = nouveau_gem_prime_vmap,
 	.vunmap = nouveau_gem_prime_vunmap,
 };
-- 
2.15.1

[PATCH 5/5] drm/nouveau: prime: Implement cache maintenance

[Thierry Reding]

From: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

Implement the ->begin_cpu_access() and ->end_cpu_access() callbacks to
allow userspace to invalidate the cache before accessing a buffer that
is exported using PRIME and flush the cache after modifying the buffer
through its userspace mapping.

Signed-off-by: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
 drivers/gpu/drm/nouveau/nouveau_prime.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/gpu/drm/nouveau/nouveau_prime.c b/drivers/gpu/drm/nouveau/nouveau_prime.c
index 5d885d7cb059..a3a586ce864c 100644
--- a/drivers/gpu/drm/nouveau/nouveau_prime.c
+++ b/drivers/gpu/drm/nouveau/nouveau_prime.c
@@ -29,6 +29,26 @@
 #include "nouveau_drv.h"
 #include "nouveau_gem.h"
 
+static int nouveau_gem_prime_begin_cpu_access(struct dma_buf *buf,
+					      enum dma_data_direction direction)
+{
+	struct nouveau_bo *bo = nouveau_gem_object(buf->priv);
+
+	nouveau_bo_sync_for_cpu(bo);
+
+	return 0;
+}
+
+static int nouveau_gem_prime_end_cpu_access(struct dma_buf *buf,
+					    enum dma_data_direction direction)
+{
+	struct nouveau_bo *bo = nouveau_gem_object(buf->priv);
+
+	nouveau_bo_sync_for_device(bo);
+
+	return 0;
+}
+
 static void *nouveau_gem_prime_kmap_atomic(struct dma_buf *buf,
 					   unsigned long page)
 {
@@ -106,6 +126,8 @@ static const struct dma_buf_ops nouveau_gem_prime_dmabuf_ops = {
 	.map_dma_buf = drm_gem_map_dma_buf,
 	.unmap_dma_buf = drm_gem_unmap_dma_buf,
 	.release = drm_gem_dmabuf_release,
+	.begin_cpu_access = nouveau_gem_prime_begin_cpu_access,
+	.end_cpu_access = nouveau_gem_prime_end_cpu_access,
 	.map_atomic = nouveau_gem_prime_kmap_atomic,
 	.unmap_atomic = nouveau_gem_prime_kunmap_atomic,
 	.map = nouveau_gem_prime_kmap,
-- 
2.15.1

Re: [Nouveau] [PATCH 2/5] drm/prime: Export more helpers for drivers

[Daniel Vetter]

On Thu, Jan 11, 2018 at 10:44:17PM +0100, Thierry Reding wrote:
> From: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> 
> Export some more of the helpers in order to allow drivers to more fine-
> grainedly select which helpers to use. This gives drivers an easy way to
> reuse a lot of the code in the helpers while at the same time allowing
> them to provide their own implementation for other functions in struct
> dma_buf_ops.
> 
> Signed-off-by: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

Same request as with the amd one: Pls supply a bit of kerneldoc and maybe
polished intro section. Otherwise lgtm.
-Daniel

> ---
>  drivers/gpu/drm/drm_prime.c | 23 +++++++++++++----------
>  include/drm/drm_prime.h     | 12 ++++++++++++
>  2 files changed, 25 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
> index 9a17725b0f7a..f9903e6b59f6 100644
> --- a/drivers/gpu/drm/drm_prime.c
> +++ b/drivers/gpu/drm/drm_prime.c
> @@ -180,9 +180,8 @@ static int drm_prime_lookup_buf_handle(struct drm_prime_file_private *prime_fpri
>  	return -ENOENT;
>  }
>  
> -static int drm_gem_map_attach(struct dma_buf *dma_buf,
> -			      struct device *target_dev,
> -			      struct dma_buf_attachment *attach)
> +int drm_gem_map_attach(struct dma_buf *dma_buf, struct device *target_dev,
> +		       struct dma_buf_attachment *attach)
>  {
>  	struct drm_prime_attachment *prime_attach;
>  	struct drm_gem_object *obj = dma_buf->priv;
> @@ -200,9 +199,10 @@ static int drm_gem_map_attach(struct dma_buf *dma_buf,
>  
>  	return dev->driver->gem_prime_pin(obj);
>  }
> +EXPORT_SYMBOL(drm_gem_map_attach);
>  
> -static void drm_gem_map_detach(struct dma_buf *dma_buf,
> -			       struct dma_buf_attachment *attach)
> +void drm_gem_map_detach(struct dma_buf *dma_buf,
> +			struct dma_buf_attachment *attach)
>  {
>  	struct drm_prime_attachment *prime_attach = attach->priv;
>  	struct drm_gem_object *obj = dma_buf->priv;
> @@ -228,6 +228,7 @@ static void drm_gem_map_detach(struct dma_buf *dma_buf,
>  	kfree(prime_attach);
>  	attach->priv = NULL;
>  }
> +EXPORT_SYMBOL(drm_gem_map_detach);
>  
>  void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpriv,
>  					struct dma_buf *dma_buf)
> @@ -254,8 +255,8 @@ void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpr
>  	}
>  }
>  
> -static struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
> -					    enum dma_data_direction dir)
> +struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
> +				     enum dma_data_direction dir)
>  {
>  	struct drm_prime_attachment *prime_attach = attach->priv;
>  	struct drm_gem_object *obj = attach->dmabuf->priv;
> @@ -291,13 +292,15 @@ static struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
>  
>  	return sgt;
>  }
> +EXPORT_SYMBOL(drm_gem_map_dma_buf);
>  
> -static void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
> -				  struct sg_table *sgt,
> -				  enum dma_data_direction dir)
> +void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
> +			   struct sg_table *sgt,
> +			   enum dma_data_direction dir)
>  {
>  	/* nothing to be done here */
>  }
> +EXPORT_SYMBOL(drm_gem_unmap_dma_buf);
>  
>  /**
>   * drm_gem_dmabuf_export - dma_buf export implementation for GEM
> diff --git a/include/drm/drm_prime.h b/include/drm/drm_prime.h
> index 59ccab402e85..3a9706815773 100644
> --- a/include/drm/drm_prime.h
> +++ b/include/drm/drm_prime.h
> @@ -50,8 +50,10 @@ struct drm_prime_file_private {
>  	struct rb_root handles;
>  };
>  
> +enum dma_data_direction;
>  struct device;
>  
> +struct dma_buf_attachment;
>  struct dma_buf_export_info;
>  struct dma_buf;
>  
> @@ -59,6 +61,16 @@ struct drm_device;
>  struct drm_gem_object;
>  struct drm_file;
>  
> +int drm_gem_map_attach(struct dma_buf *dma_buf, struct device *target_dev,
> +		       struct dma_buf_attachment *attach);
> +void drm_gem_map_detach(struct dma_buf *dma_buf,
> +			struct dma_buf_attachment *attach);
> +struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
> +				     enum dma_data_direction dir);
> +void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
> +			   struct sg_table *sgt,
> +			   enum dma_data_direction dir);
> +
>  struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
>  				     struct drm_gem_object *obj,
>  				     int flags);
> -- 
> 2.15.1
> 
> _______________________________________________
> Nouveau mailing list
> Nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
> https://lists.freedesktop.org/mailman/listinfo/nouveau

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch