diff mbox series

[v2,01/22] drm/i915/stolen: make the object creation interface consistent

Message ID 20191003192444.10113-2-matthew.auld@intel.com (mailing list archive)
State New, archived
Headers show
Series LMEM basics | expand

Commit Message

Matthew Auld Oct. 3, 2019, 7:24 p.m. UTC 
From: CQ Tang <cq.tang@intel.com>

Our other backends return an actual error value upon failure. Do the
same for stolen objects, which currently just return NULL on failure.

Signed-off-by: CQ Tang <cq.tang@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/display/intel_display.c |  2 +-
 drivers/gpu/drm/i915/display/intel_fbdev.c   |  4 +--
 drivers/gpu/drm/i915/display/intel_overlay.c |  2 +-
 drivers/gpu/drm/i915/gem/i915_gem_stolen.c   | 36 +++++++++++---------
 drivers/gpu/drm/i915/gt/intel_gt.c           |  2 +-
 drivers/gpu/drm/i915/gt/intel_rc6.c          |  4 +--
 drivers/gpu/drm/i915/gt/intel_ringbuffer.c   |  2 +-
 7 files changed, 28 insertions(+), 24 deletions(-)

Comments

Chris Wilson Oct. 3, 2019, 7:29 p.m. UTC | #1 
Quoting Matthew Auld (2019-10-03 20:24:23)
> diff --git a/drivers/gpu/drm/i915/gt/intel_rc6.c b/drivers/gpu/drm/i915/gt/intel_rc6.c
> index d6167dd592e9..dcf189f26624 100644
> --- a/drivers/gpu/drm/i915/gt/intel_rc6.c
> +++ b/drivers/gpu/drm/i915/gt/intel_rc6.c
> @@ -299,7 +299,7 @@ static int vlv_rc6_init(struct intel_rc6 *rc6)
>                                                                       pcbr_offset,
>                                                                       I915_GTT_OFFSET_NONE,
>                                                                       pctx_size);
> -               if (!pctx)
> +               if (IS_ERR(pctx))
>                         return -ENOMEM;
>  
>                 goto out;
> @@ -316,7 +316,7 @@ static int vlv_rc6_init(struct intel_rc6 *rc6)
>          * memory, or any other relevant ranges.
>          */
>         pctx = i915_gem_object_create_stolen(i915, pctx_size);
> -       if (!pctx) {
> +       if (IS_ERR(pctx)) {
>                 DRM_DEBUG("not enough stolen space for PCTX, disabling\n");
>                 return -ENOMEM;

You might as well make use of the actual error now that you know it.

With that minor tweak,
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
-Chris
diff mbox series

Patch

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index c3ac5a5c5185..3a7e324fab26 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -3071,7 +3071,7 @@  intel_alloc_initial_plane_obj(struct intel_crtc *crtc,
 							     base_aligned,
 							     size_aligned);
 	mutex_unlock(&dev->struct_mutex);
-	if (!obj)
+	if (IS_ERR(obj))
 		return false;
 
 	switch (plane_config->tiling) {
diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
index 68338669f054..8e31f254b0d9 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
@@ -141,10 +141,10 @@  static int intelfb_alloc(struct drm_fb_helper *helper,
 	/* If the FB is too big, just don't use it since fbdev is not very
 	 * important and we should probably use that space with FBC or other
 	 * features. */
-	obj = NULL;
+	obj = ERR_PTR(-ENODEV);
 	if (size * 2 < dev_priv->stolen_usable_size)
 		obj = i915_gem_object_create_stolen(dev_priv, size);
-	if (obj == NULL)
+	if (IS_ERR(obj))
 		obj = i915_gem_object_create_shmem(dev_priv, size);
 	if (IS_ERR(obj)) {
 		DRM_ERROR("failed to allocate framebuffer\n");
diff --git a/drivers/gpu/drm/i915/display/intel_overlay.c b/drivers/gpu/drm/i915/display/intel_overlay.c
index 5efef9babadb..fb4e2047efdb 100644
--- a/drivers/gpu/drm/i915/display/intel_overlay.c
+++ b/drivers/gpu/drm/i915/display/intel_overlay.c
@@ -1306,7 +1306,7 @@  static int get_registers(struct intel_overlay *overlay, bool use_phys)
 	mutex_lock(&i915->drm.struct_mutex);
 
 	obj = i915_gem_object_create_stolen(i915, PAGE_SIZE);
-	if (obj == NULL)
+	if (IS_ERR(obj))
 		obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
 	if (IS_ERR(obj)) {
 		err = PTR_ERR(obj);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
index bfbc3e3daf92..3dd295bb61f6 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
@@ -585,28 +585,32 @@  i915_gem_object_create_stolen(struct drm_i915_private *dev_priv,
 	int ret;
 
 	if (!drm_mm_initialized(&dev_priv->mm.stolen))
-		return NULL;
+		return ERR_PTR(-ENODEV);
 
 	if (size == 0)
-		return NULL;
+		return ERR_PTR(-EINVAL);
 
 	stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 	if (!stolen)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 
 	ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
-	if (ret) {
-		kfree(stolen);
-		return NULL;
-	}
+	if (ret)
+		goto err_free;
 
 	obj = _i915_gem_object_create_stolen(dev_priv, stolen);
-	if (obj)
-		return obj;
+	if (obj == NULL) {
+		ret = -ENOMEM;
+		goto err_remove;
+	}
 
+	return obj;
+
+err_remove:
 	i915_gem_stolen_remove_node(dev_priv, stolen);
+err_free:
 	kfree(stolen);
-	return NULL;
+	return ERR_PTR(ret);
 }
 
 struct drm_i915_gem_object *
@@ -622,7 +626,7 @@  i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv
 	int ret;
 
 	if (!drm_mm_initialized(&dev_priv->mm.stolen))
-		return NULL;
+		return ERR_PTR(-ENODEV);
 
 	lockdep_assert_held(&dev_priv->drm.struct_mutex);
 
@@ -633,11 +637,11 @@  i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv
 	if (WARN_ON(size == 0) ||
 	    WARN_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)) ||
 	    WARN_ON(!IS_ALIGNED(stolen_offset, I915_GTT_MIN_ALIGNMENT)))
-		return NULL;
+		return ERR_PTR(-EINVAL);
 
 	stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 	if (!stolen)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 
 	stolen->start = stolen_offset;
 	stolen->size = size;
@@ -647,7 +651,7 @@  i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv
 	if (ret) {
 		DRM_DEBUG_DRIVER("failed to allocate stolen space\n");
 		kfree(stolen);
-		return NULL;
+		return ERR_PTR(ret);
 	}
 
 	obj = _i915_gem_object_create_stolen(dev_priv, stolen);
@@ -655,7 +659,7 @@  i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv
 		DRM_DEBUG_DRIVER("failed to allocate stolen object\n");
 		i915_gem_stolen_remove_node(dev_priv, stolen);
 		kfree(stolen);
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 	}
 
 	/* Some objects just need physical mem from stolen space */
@@ -704,5 +708,5 @@  i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv
 	i915_gem_object_unpin_pages(obj);
 err:
 	i915_gem_object_put(obj);
-	return NULL;
+	return ERR_PTR(ret);
 }
diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index 0e5909ee0657..b45ac5c643de 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -331,7 +331,7 @@  static int intel_gt_init_scratch(struct intel_gt *gt, unsigned int size)
 	int ret;
 
 	obj = i915_gem_object_create_stolen(i915, size);
-	if (!obj)
+	if (IS_ERR(obj))
 		obj = i915_gem_object_create_internal(i915, size);
 	if (IS_ERR(obj)) {
 		DRM_ERROR("Failed to allocate scratch page\n");
diff --git a/drivers/gpu/drm/i915/gt/intel_rc6.c b/drivers/gpu/drm/i915/gt/intel_rc6.c
index d6167dd592e9..dcf189f26624 100644
--- a/drivers/gpu/drm/i915/gt/intel_rc6.c
+++ b/drivers/gpu/drm/i915/gt/intel_rc6.c
@@ -299,7 +299,7 @@  static int vlv_rc6_init(struct intel_rc6 *rc6)
 								      pcbr_offset,
 								      I915_GTT_OFFSET_NONE,
 								      pctx_size);
-		if (!pctx)
+		if (IS_ERR(pctx))
 			return -ENOMEM;
 
 		goto out;
@@ -316,7 +316,7 @@  static int vlv_rc6_init(struct intel_rc6 *rc6)
 	 * memory, or any other relevant ranges.
 	 */
 	pctx = i915_gem_object_create_stolen(i915, pctx_size);
-	if (!pctx) {
+	if (IS_ERR(pctx)) {
 		DRM_DEBUG("not enough stolen space for PCTX, disabling\n");
 		return -ENOMEM;
 	}
diff --git a/drivers/gpu/drm/i915/gt/intel_ringbuffer.c b/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
index 0747b8c9f768..e220c09c6f32 100644
--- a/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
@@ -1274,7 +1274,7 @@  static struct i915_vma *create_ring_vma(struct i915_ggtt *ggtt, int size)
 	struct i915_vma *vma;
 
 	obj = i915_gem_object_create_stolen(i915, size);
-	if (!obj)
+	if (IS_ERR(obj))
 		obj = i915_gem_object_create_internal(i915, size);
 	if (IS_ERR(obj))
 		return ERR_CAST(obj);