Revert "intel: We don't need to take the bufmgr lock whilst mapping."

This reverts commit 7ca558494dd3f68f29bb6ca981de9b8f49620b60.

This was pushed ahead of an essential review of bo level locking in
mesa, without which we cannot know whether removing this lock is safe.

1 files changed, 17 insertions, 0 deletions

diff --git a/intel/intel_bufmgr_gem.c b/intel/intel_bufmgr_gem.c
index 9daa89ad..54c82d62 100644
--- a/intel/intel_bufmgr_gem.c
+++ b/intel/intel_bufmgr_gem.c
@@ -927,6 +927,8 @@ static int drm_intel_gem_bo_map(drm_intel_bo *bo, int write_enable)
 	struct drm_i915_gem_set_domain set_domain;
 	int ret;
 
+	pthread_mutex_lock(&bufmgr_gem->lock);
+
 	/* Allow recursive mapping. Mesa may recursively map buffers with
 	 * nested display loops.
 	 */
@@ -950,6 +952,7 @@ static int drm_intel_gem_bo_map(drm_intel_bo *bo, int write_enable)
 				"%s:%d: Error mapping buffer %d (%s): %s .\n",
 				__FILE__, __LINE__, bo_gem->gem_handle,
 				bo_gem->name, strerror(errno));
+			pthread_mutex_unlock(&bufmgr_gem->lock);
 			return ret;
 		}
 		bo_gem->mem_virtual = (void *)(uintptr_t) mmap_arg.addr_ptr;
@@ -974,9 +977,12 @@ static int drm_intel_gem_bo_map(drm_intel_bo *bo, int write_enable)
 		fprintf(stderr, "%s:%d: Error setting to CPU domain %d: %s\n",
 			__FILE__, __LINE__, bo_gem->gem_handle,
 			strerror(errno));
+		pthread_mutex_unlock(&bufmgr_gem->lock);
 		return ret;
 	}
 
+	pthread_mutex_unlock(&bufmgr_gem->lock);
+
 	return 0;
 }
 
@@ -987,6 +993,8 @@ int drm_intel_gem_bo_map_gtt(drm_intel_bo *bo)
 	struct drm_i915_gem_set_domain set_domain;
 	int ret;
 
+	pthread_mutex_lock(&bufmgr_gem->lock);
+
 	/* Get a mapping of the buffer if we haven't before. */
 	if (bo_gem->gtt_virtual == NULL) {
 		struct drm_i915_gem_mmap_gtt mmap_arg;
@@ -1010,6 +1018,7 @@ int drm_intel_gem_bo_map_gtt(drm_intel_bo *bo)
 				__FILE__, __LINE__,
 				bo_gem->gem_handle, bo_gem->name,
 				strerror(errno));
+			pthread_mutex_unlock(&bufmgr_gem->lock);
 			return ret;
 		}
 
@@ -1025,6 +1034,7 @@ int drm_intel_gem_bo_map_gtt(drm_intel_bo *bo)
 				__FILE__, __LINE__,
 				bo_gem->gem_handle, bo_gem->name,
 				strerror(errno));
+			pthread_mutex_unlock(&bufmgr_gem->lock);
 			return ret;
 		}
 	}
@@ -1051,6 +1061,8 @@ int drm_intel_gem_bo_map_gtt(drm_intel_bo *bo)
 			strerror(errno));
 	}
 
+	pthread_mutex_unlock(&bufmgr_gem->lock);
+
 	return ret;
 }
 
@@ -1065,7 +1077,9 @@ int drm_intel_gem_bo_unmap_gtt(drm_intel_bo *bo)
 
 	assert(bo_gem->gtt_virtual != NULL);
 
+	pthread_mutex_lock(&bufmgr_gem->lock);
 	bo->virtual = NULL;
+	pthread_mutex_unlock(&bufmgr_gem->lock);
 
 	return ret;
 }
@@ -1082,6 +1096,8 @@ static int drm_intel_gem_bo_unmap(drm_intel_bo *bo)
 
 	assert(bo_gem->mem_virtual != NULL);
 
+	pthread_mutex_lock(&bufmgr_gem->lock);
+
 	/* Cause a flush to happen if the buffer's pinned for scanout, so the
 	 * results show up in a timely manner.
 	 */
@@ -1094,6 +1110,7 @@ static int drm_intel_gem_bo_unmap(drm_intel_bo *bo)
 	ret = ret == -1 ? -errno : 0;
 
 	bo->virtual = NULL;
+	pthread_mutex_unlock(&bufmgr_gem->lock);
 
 	return ret;
 }