[PATCH 10/26] drm/radeon: add try_free callback to the SA

[Christian König]

To prevent deadlocks under extreme conditions.

Signed-off-by: Christian König <deathsimple at vodafone.de>
---
 drivers/gpu/drm/radeon/radeon.h        |    1 +
 drivers/gpu/drm/radeon/radeon_gart.c   |    2 +-
 drivers/gpu/drm/radeon/radeon_object.h |    3 ++-
 drivers/gpu/drm/radeon/radeon_ring.c   |    2 +-
 drivers/gpu/drm/radeon/radeon_sa.c     |   15 ++++++++++++---
 5 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index e71dc67..4f7e941 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -389,6 +389,7 @@ struct radeon_sa_manager {
 	uint64_t		gpu_addr;
 	void			*cpu_ptr;
 	uint32_t		domain;
+	void			(*try_free)(struct radeon_device *);
 };
 
 /* sub-allocation buffer */
diff --git a/drivers/gpu/drm/radeon/radeon_gart.c b/drivers/gpu/drm/radeon/radeon_gart.c
index 7af4ff9..fba3884 100644
--- a/drivers/gpu/drm/radeon/radeon_gart.c
+++ b/drivers/gpu/drm/radeon/radeon_gart.c
@@ -291,7 +291,7 @@ int radeon_vm_manager_init(struct radeon_device *rdev)
 	/* mark first vm as always in use, it's the system one */
 	r = radeon_sa_bo_manager_init(rdev, &rdev->vm_manager.sa_manager,
 				      rdev->vm_manager.max_pfn * 8,
-				      RADEON_GEM_DOMAIN_VRAM);
+				      RADEON_GEM_DOMAIN_VRAM, NULL);
 	if (r) {
 		dev_err(rdev->dev, "failed to allocate vm bo (%dKB)\n",
 			(rdev->vm_manager.max_pfn * 8) >> 10);
diff --git a/drivers/gpu/drm/radeon/radeon_object.h b/drivers/gpu/drm/radeon/radeon_object.h
index 85f33d9..08505ed 100644
--- a/drivers/gpu/drm/radeon/radeon_object.h
+++ b/drivers/gpu/drm/radeon/radeon_object.h
@@ -148,7 +148,8 @@ extern struct radeon_bo_va *radeon_bo_va(struct radeon_bo *rbo,
  */
 extern int radeon_sa_bo_manager_init(struct radeon_device *rdev,
 				     struct radeon_sa_manager *sa_manager,
-				     unsigned size, u32 domain);
+				     unsigned size, u32 domain,
+				     void (*try_free)(struct radeon_device *rdev));
 extern void radeon_sa_bo_manager_fini(struct radeon_device *rdev,
 				      struct radeon_sa_manager *sa_manager);
 extern int radeon_sa_bo_manager_start(struct radeon_device *rdev,
diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c
index ccee74f..ae28129 100644
--- a/drivers/gpu/drm/radeon/radeon_ring.c
+++ b/drivers/gpu/drm/radeon/radeon_ring.c
@@ -216,7 +216,7 @@ int radeon_ib_pool_init(struct radeon_device *rdev)
 
 	r = radeon_sa_bo_manager_init(rdev, &rdev->ib_pool.sa_manager,
 				      RADEON_IB_POOL_SIZE*64*1024,
-				      RADEON_GEM_DOMAIN_GTT);
+				      RADEON_GEM_DOMAIN_GTT, NULL);
 	if (r) {
 		return r;
 	}
diff --git a/drivers/gpu/drm/radeon/radeon_sa.c b/drivers/gpu/drm/radeon/radeon_sa.c
index 92ab7b4..9d3e70a 100644
--- a/drivers/gpu/drm/radeon/radeon_sa.c
+++ b/drivers/gpu/drm/radeon/radeon_sa.c
@@ -34,7 +34,8 @@
 
 int radeon_sa_bo_manager_init(struct radeon_device *rdev,
 			      struct radeon_sa_manager *sa_manager,
-			      unsigned size, u32 domain)
+			      unsigned size, u32 domain,
+			      void (*try_free)(struct radeon_device *rdev))
 {
 	int r;
 
@@ -43,6 +44,7 @@ int radeon_sa_bo_manager_init(struct radeon_device *rdev,
 	sa_manager->size = size;
 	sa_manager->biggest_hole = &sa_manager->sa_bo;
 	sa_manager->domain = domain;
+	sa_manager->try_free = try_free;
 	INIT_LIST_HEAD(&sa_manager->sa_bo);
 
 	r = radeon_bo_create(rdev, size, RADEON_GPU_PAGE_SIZE, true,
@@ -224,8 +226,15 @@ int radeon_sa_bo_new(struct radeon_device *rdev,
 		}
 
 		if (block) {
-			/* failed to find something big enough, wait
-			   for the biggest hole to increase in size */
+			/* failed to find something big enough */
+			if (sa_manager->try_free) {
+				/* try to free something */
+				spin_unlock_irq(&sa_manager->queue.lock);
+				sa_manager->try_free(rdev);
+				spin_lock_irq(&sa_manager->queue.lock);
+			}
+
+			/* and wait for the biggest hole to increase in size */
 			r = wait_event_interruptible_locked_irq(sa_manager->queue,
 				radeon_sa_bo_min_free(sa_manager, align) >= size
 			);
-- 
1.7.5.4