linux-kernel - [34/38] drm/radeon: fall back to GTT if bo creation/validation in VRAM fails.

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Date:	Fri, 06 Aug 2010 11:30:55 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Michel DÃ€nzer <daenzer@...are.com>,
	Dave Airlie <airlied@...hat.com>
Subject: [34/38] drm/radeon: fall back to GTT if bo creation/validation in VRAM fails.

2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Michel Dänzer <daenzer@...are.com>

commit e376573f7267390f4e1bdc552564b6fb913bce76 upstream.

This fixes a problem where on low VRAM cards we'd run out of space for validation.

[airlied: Tested on my M7, Thinkpad T42, compiz works with no problems.]

Signed-off-by: Michel Dänzer <daenzer@...are.com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/gpu/drm/radeon/radeon_object.c |   27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -110,6 +110,7 @@ int radeon_bo_create(struct radeon_devic
 	bo->surface_reg = -1;
 	INIT_LIST_HEAD(&bo->list);
 
+retry:
 	radeon_ttm_placement_from_domain(bo, domain);
 	/* Kernel allocation are uninterruptible */
 	mutex_lock(&rdev->vram_mutex);
@@ -118,10 +119,15 @@ int radeon_bo_create(struct radeon_devic
 			&radeon_ttm_bo_destroy);
 	mutex_unlock(&rdev->vram_mutex);
 	if (unlikely(r != 0)) {
-		if (r != -ERESTARTSYS)
+		if (r != -ERESTARTSYS) {
+			if (domain == RADEON_GEM_DOMAIN_VRAM) {
+				domain |= RADEON_GEM_DOMAIN_GTT;
+				goto retry;
+			}
 			dev_err(rdev->dev,
 				"object_init failed for (%lu, 0x%08X)\n",
 				size, domain);
+		}
 		return r;
 	}
 	*bo_ptr = bo;
@@ -321,6 +327,7 @@ int radeon_bo_list_validate(struct list_
 {
 	struct radeon_bo_list *lobj;
 	struct radeon_bo *bo;
+	u32 domain;
 	int r;
 
 	list_for_each_entry(lobj, head, list) {
@@ -333,17 +340,19 @@ int radeon_bo_list_validate(struct list_
 	list_for_each_entry(lobj, head, list) {
 		bo = lobj->bo;
 		if (!bo->pin_count) {
-			if (lobj->wdomain) {
-				radeon_ttm_placement_from_domain(bo,
-								lobj->wdomain);
-			} else {
-				radeon_ttm_placement_from_domain(bo,
-								lobj->rdomain);
-			}
+			domain = lobj->wdomain ? lobj->wdomain : lobj->rdomain;
+
+		retry:
+			radeon_ttm_placement_from_domain(bo, domain);
 			r = ttm_bo_validate(&bo->tbo, &bo->placement,
 						true, false, false);
-			if (unlikely(r))
+			if (unlikely(r)) {
+				if (r != -ERESTARTSYS && domain == RADEON_GEM_DOMAIN_VRAM) {
+					domain |= RADEON_GEM_DOMAIN_GTT;
+					goto retry;
+				}
 				return r;
+			}
 		}
 		lobj->gpu_offset = radeon_bo_gpu_offset(bo);
 		lobj->tiling_flags = bo->tiling_flags;


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