[PATCH 0/3] drm/vram-helper: Various improvements

[PATCH 0/3] drm/vram-helper: Various improvements

[Thomas Zimmermann]

This is a collection of improvements for GEM VRAM helpers. The patches
were part of other patchsets that didn't make it into upstream, but the
changes are nevertheless useful.

Thomas Zimmermann (3):
  drm/vram-helper: Integrate drm_gem_vram_init() into
    drm_gem_vram_create()
  drm/vram-helper: Set object function iff they are not provided by
    driver
  drm/vram-helper: Don't put new BOs into VRAM

 drivers/gpu/drm/drm_gem_vram_helper.c | 88 ++++++++++++---------------
 1 file changed, 38 insertions(+), 50 deletions(-)

--
2.28.0

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[PATCH 1/3] drm/vram-helper: Integrate drm_gem_vram_init() into drm_gem_vram_create()

[Thomas Zimmermann]

The drm_gem_vram_create() function is the only caller of the internal
helper drm_gem_vram_init(). Streamline the code by putting all code into
the create function.

v2:
	* rebased onto latest drm-tip
	* fixed typo in commit message (Sam)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
---
 drivers/gpu/drm/drm_gem_vram_helper.c | 77 ++++++++++-----------------
 1 file changed, 29 insertions(+), 48 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c
index 375c79e23ca5..9fa7f0ec9308 100644
--- a/drivers/gpu/drm/drm_gem_vram_helper.c
+++ b/drivers/gpu/drm/drm_gem_vram_helper.c
@@ -167,52 +167,6 @@ static void drm_gem_vram_placement(struct drm_gem_vram_object *gbo,
 	}
 }
 
-/*
- * Note that on error, drm_gem_vram_init will free the buffer object.
- */
-
-static int drm_gem_vram_init(struct drm_device *dev,
-			     struct drm_gem_vram_object *gbo,
-			     size_t size, unsigned long pg_align)
-{
-	struct drm_vram_mm *vmm = dev->vram_mm;
-	struct ttm_bo_device *bdev;
-	int ret;
-	size_t acc_size;
-
-	if (WARN_ONCE(!vmm, "VRAM MM not initialized")) {
-		kfree(gbo);
-		return -EINVAL;
-	}
-	bdev = &vmm->bdev;
-
-	gbo->bo.base.funcs = &drm_gem_vram_object_funcs;
-
-	ret = drm_gem_object_init(dev, &gbo->bo.base, size);
-	if (ret) {
-		kfree(gbo);
-		return ret;
-	}
-
-	acc_size = ttm_bo_dma_acc_size(bdev, size, sizeof(*gbo));
-
-	gbo->bo.bdev = bdev;
-	drm_gem_vram_placement(gbo, DRM_GEM_VRAM_PL_FLAG_VRAM |
-			       DRM_GEM_VRAM_PL_FLAG_SYSTEM);
-
-	ret = ttm_bo_init(bdev, &gbo->bo, size, ttm_bo_type_device,
-			  &gbo->placement, pg_align, false, acc_size,
-			  NULL, NULL, ttm_buffer_object_destroy);
-	if (ret)
-		/*
-		 * A failing ttm_bo_init will call ttm_buffer_object_destroy
-		 * to release gbo->bo.base and kfree gbo.
-		 */
-		return ret;
-
-	return 0;
-}
-
 /**
  * drm_gem_vram_create() - Creates a VRAM-backed GEM object
  * @dev:		the DRM device
@@ -228,7 +182,13 @@ struct drm_gem_vram_object *drm_gem_vram_create(struct drm_device *dev,
 						unsigned long pg_align)
 {
 	struct drm_gem_vram_object *gbo;
+	struct drm_vram_mm *vmm = dev->vram_mm;
+	struct ttm_bo_device *bdev;
 	int ret;
+	size_t acc_size;
+
+	if (WARN_ONCE(!vmm, "VRAM MM not initialized"))
+		return ERR_PTR(-EINVAL);
 
 	if (dev->driver->gem_create_object) {
 		struct drm_gem_object *gem =
@@ -242,8 +202,29 @@ struct drm_gem_vram_object *drm_gem_vram_create(struct drm_device *dev,
 			return ERR_PTR(-ENOMEM);
 	}
 
-	ret = drm_gem_vram_init(dev, gbo, size, pg_align);
-	if (ret < 0)
+	gbo->bo.base.funcs = &drm_gem_vram_object_funcs;
+
+	ret = drm_gem_object_init(dev, &gbo->bo.base, size);
+	if (ret) {
+		kfree(gbo);
+		return ERR_PTR(ret);
+	}
+
+	bdev = &vmm->bdev;
+	acc_size = ttm_bo_dma_acc_size(bdev, size, sizeof(*gbo));
+
+	gbo->bo.bdev = bdev;
+	drm_gem_vram_placement(gbo, DRM_GEM_VRAM_PL_FLAG_VRAM |
+			       DRM_GEM_VRAM_PL_FLAG_SYSTEM);
+
+	/*
+	 * A failing ttm_bo_init will call ttm_buffer_object_destroy
+	 * to release gbo->bo.base and kfree gbo.
+	 */
+	ret = ttm_bo_init(bdev, &gbo->bo, size, ttm_bo_type_device,
+			  &gbo->placement, pg_align, false, acc_size,
+			  NULL, NULL, ttm_buffer_object_destroy);
+	if (ret)
 		return ERR_PTR(ret);
 
 	return gbo;
-- 
2.28.0

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[PATCH 2/3] drm/vram-helper: Set object function iff they are not provided by driver

[Thomas Zimmermann]

Don't override the GEM object functions unconditionally. If the driver
sets the GEM functions, VRAM helpers will not set them. The idea has been
taken from SHMEM helpers.

v2:
	* updated the commit message (Sam)
	* document the new feature for drm_gem_vram_create()

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/drm_gem_vram_helper.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c
index 9fa7f0ec9308..11315b9e8c03 100644
--- a/drivers/gpu/drm/drm_gem_vram_helper.c
+++ b/drivers/gpu/drm/drm_gem_vram_helper.c
@@ -173,6 +173,12 @@ static void drm_gem_vram_placement(struct drm_gem_vram_object *gbo,
  * @size:		the buffer size in bytes
  * @pg_align:		the buffer's alignment in multiples of the page size
  *
+ * GEM objects are allocated by calling struct drm_driver.gem_create_object,
+ * if set. Otherwise kzalloc() will be used. Drivers can set their own GEM
+ * object functions in struct drm_driver.gem_create_object. If no functions
+ * are set, the new GEM object will use the default functions from GEM VRAM
+ * helpers.
+ *
  * Returns:
  * A new instance of &struct drm_gem_vram_object on success, or
  * an ERR_PTR()-encoded error code otherwise.
@@ -182,6 +188,7 @@ struct drm_gem_vram_object *drm_gem_vram_create(struct drm_device *dev,
 						unsigned long pg_align)
 {
 	struct drm_gem_vram_object *gbo;
+	struct drm_gem_object *gem;
 	struct drm_vram_mm *vmm = dev->vram_mm;
 	struct ttm_bo_device *bdev;
 	int ret;
@@ -191,8 +198,7 @@ struct drm_gem_vram_object *drm_gem_vram_create(struct drm_device *dev,
 		return ERR_PTR(-EINVAL);
 
 	if (dev->driver->gem_create_object) {
-		struct drm_gem_object *gem =
-			dev->driver->gem_create_object(dev, size);
+		gem = dev->driver->gem_create_object(dev, size);
 		if (!gem)
 			return ERR_PTR(-ENOMEM);
 		gbo = drm_gem_vram_of_gem(gem);
@@ -200,11 +206,13 @@ struct drm_gem_vram_object *drm_gem_vram_create(struct drm_device *dev,
 		gbo = kzalloc(sizeof(*gbo), GFP_KERNEL);
 		if (!gbo)
 			return ERR_PTR(-ENOMEM);
+		gem = &gbo->bo.base;
 	}
 
-	gbo->bo.base.funcs = &drm_gem_vram_object_funcs;
+	if (!gem->funcs)
+		gem->funcs = &drm_gem_vram_object_funcs;
 
-	ret = drm_gem_object_init(dev, &gbo->bo.base, size);
+	ret = drm_gem_object_init(dev, gem, size);
 	if (ret) {
 		kfree(gbo);
 		return ERR_PTR(ret);
-- 
2.28.0

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[PATCH 3/3] drm/vram-helper: Don't put new BOs into VRAM

[Thomas Zimmermann]

Most drivers that use VRAM helpers have only a few MiB of framebuffer
memory available. To reduce fragmentation, new BOs are now put into
system memory by default. Only pin operations are allowed to move BOs
into VRAM.

v2:
	* rebased onto latest drm-tip

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/drm_gem_vram_helper.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c
index 11315b9e8c03..9d85790e0c07 100644
--- a/drivers/gpu/drm/drm_gem_vram_helper.c
+++ b/drivers/gpu/drm/drm_gem_vram_helper.c
@@ -222,8 +222,7 @@ struct drm_gem_vram_object *drm_gem_vram_create(struct drm_device *dev,
 	acc_size = ttm_bo_dma_acc_size(bdev, size, sizeof(*gbo));
 
 	gbo->bo.bdev = bdev;
-	drm_gem_vram_placement(gbo, DRM_GEM_VRAM_PL_FLAG_VRAM |
-			       DRM_GEM_VRAM_PL_FLAG_SYSTEM);
+	drm_gem_vram_placement(gbo, DRM_GEM_VRAM_PL_FLAG_SYSTEM);
 
 	/*
 	 * A failing ttm_bo_init will call ttm_buffer_object_destroy
-- 
2.28.0

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Re: [PATCH 0/3] drm/vram-helper: Various improvements

[Daniel Vetter]

On Tue, Sep 22, 2020 at 04:56:57PM +0200, Thomas Zimmermann wrote:
> This is a collection of improvements for GEM VRAM helpers. The patches
> were part of other patchsets that didn't make it into upstream, but the
> changes are nevertheless useful.

On the series:

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

> 
> Thomas Zimmermann (3):
>   drm/vram-helper: Integrate drm_gem_vram_init() into
>     drm_gem_vram_create()
>   drm/vram-helper: Set object function iff they are not provided by
>     driver
>   drm/vram-helper: Don't put new BOs into VRAM
> 
>  drivers/gpu/drm/drm_gem_vram_helper.c | 88 ++++++++++++---------------
>  1 file changed, 38 insertions(+), 50 deletions(-)
> 
> --
> 2.28.0
> 

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