drm/radeon: Remove tests for -ERESTART from the TTM code.

Also sets affected TTM calls up to not wait interruptible, since
that would cause an in-kernel spin until the TTM call succeeds, since
the Radeon code does not return to user-space when a signal is received.

Modifies interruptible fence waits to return -ERESTARTSYS rather than
-EBUSY when interrupted by a signal, since that's the (yet undocumented)
semantics required by the TTM sync object hooks.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

2 files changed, 14 insertions, 29 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_fence.c b/drivers/gpu/drm/radeon/radeon_fence.c
index 2ac31633d72c..78743cd70433 100644
--- a/drivers/gpu/drm/radeon/radeon_fence.c
+++ b/drivers/gpu/drm/radeon/radeon_fence.c
@@ -197,9 +197,8 @@ retry:
                 r = wait_event_interruptible_timeout(rdev->fence_drv.queue,
                                 radeon_fence_signaled(fence), timeout);
                 radeon_irq_kms_sw_irq_put(rdev);
-                if (unlikely(r == -ERESTARTSYS)) {
-                        return -EBUSY;
-                }
+                if (unlikely(r != 0))
+                        return r;
         } else {
                 radeon_irq_kms_sw_irq_get(rdev);
                 r = wait_event_timeout(rdev->fence_drv.queue,
diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index d9b239bce12a..ca172adfddb1 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -121,16 +121,15 @@ int radeon_bo_create(struct radeon_device *rdev, struct drm_gem_object *gobj,
         INIT_LIST_HEAD(&bo->list);
 
         flags = radeon_ttm_flags_from_domain(domain);
-retry:
+        /* Kernel allocation are uninterruptible */
         r = ttm_buffer_object_init(&rdev->mman.bdev, &bo->tbo, size, type,
-                                        flags, 0, 0, true, NULL, size,
+                                        flags, 0, 0, !kernel, NULL, size,
                                         &radeon_ttm_bo_destroy);
         if (unlikely(r != 0)) {
-                if (r == -ERESTART)
-                        goto retry;
-                /* ttm call radeon_ttm_object_object_destroy if error happen */
-                dev_err(rdev->dev, "object_init failed for (%ld, 0x%08X)\n",
-                        size, flags);
+                if (r != -ERESTARTSYS)
+                        dev_err(rdev->dev,
+                                "object_init failed for (%ld, 0x%08X)\n",
+                                size, flags);
                 return r;
         }
         *bo_ptr = bo;
@@ -200,18 +199,14 @@ int radeon_bo_pin(struct radeon_bo *bo, u32 domain, u64 *gpu_addr)
         radeon_ttm_placement_from_domain(bo, domain);
         for (i = 0; i < bo->placement.num_placement; i++)
                 bo->placements[i] |= TTM_PL_FLAG_NO_EVICT;
-retry:
-        r = ttm_buffer_object_validate(&bo->tbo, &bo->placement, true, false);
+        r = ttm_buffer_object_validate(&bo->tbo, &bo->placement, false, false);
         if (likely(r == 0)) {
                 bo->pin_count = 1;
                 if (gpu_addr != NULL)
                         *gpu_addr = radeon_bo_gpu_offset(bo);
         }
-        if (unlikely(r != 0)) {
-                if (r == -ERESTART)
-                        goto retry;
+        if (unlikely(r != 0))
                 dev_err(bo->rdev->dev, "%p pin failed\n", bo);
-        }
         return r;
 }
 
@@ -228,15 +223,10 @@ int radeon_bo_unpin(struct radeon_bo *bo)
                 return 0;
         for (i = 0; i < bo->placement.num_placement; i++)
                 bo->placements[i] &= ~TTM_PL_FLAG_NO_EVICT;
-retry:
-        r = ttm_buffer_object_validate(&bo->tbo, &bo->placement, true, false);
-        if (unlikely(r != 0)) {
-                if (r == -ERESTART)
-                        goto retry;
+        r = ttm_buffer_object_validate(&bo->tbo, &bo->placement, false, false);
+        if (unlikely(r != 0))
                 dev_err(bo->rdev->dev, "%p validate failed for unpin\n", bo);
-                return r;
-        }
-        return 0;
+        return r;
 }
 
 int radeon_bo_evict_vram(struct radeon_device *rdev)
@@ -346,15 +336,11 @@ int radeon_bo_list_validate(struct list_head *head, void *fence)
                                 radeon_ttm_placement_from_domain(bo,
                                                                 lobj->rdomain);
                         }
-retry:
                         r = ttm_buffer_object_validate(&bo->tbo,
                                                 &bo->placement,
                                                 true, false);
-                        if (unlikely(r)) {
-                                if (r == -ERESTART)
-                                        goto retry;
+                        if (unlikely(r))
                                 return r;
-                        }
                 }
                 lobj->gpu_offset = radeon_bo_gpu_offset(bo);
                 lobj->tiling_flags = bo->tiling_flags;