1 files changed, 119 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_semaphore.c b/drivers/gpu/drm/radeon/radeon_semaphore.c
new file mode 100644
index 0000000..8dcc20f
--- /dev/null
+++ b/drivers/gpu/drm/radeon/radeon_semaphore.c
@@ -0,0 +1,119 @@
+/*
+ * Copyright 2011 Christian König.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ */
+/*
+ * Authors:
+ *    Christian König <deathsimple@vodafone.de>
+ */
+#include <drm/drmP.h>
+#include "radeon.h"
+
+
+int radeon_semaphore_create(struct radeon_device *rdev,
+			    struct radeon_semaphore **semaphore)
+{
+	int r;
+
+	*semaphore = kmalloc(sizeof(struct radeon_semaphore), GFP_KERNEL);
+	if (*semaphore == NULL) {
+		return -ENOMEM;
+	}
+	r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo,
+			     &(*semaphore)->sa_bo, 8, 8, true);
+	if (r) {
+		kfree(*semaphore);
+		*semaphore = NULL;
+		return r;
+	}
+	(*semaphore)->waiters = 0;
+	(*semaphore)->gpu_addr = radeon_sa_bo_gpu_addr((*semaphore)->sa_bo);
+	*((uint64_t*)radeon_sa_bo_cpu_addr((*semaphore)->sa_bo)) = 0;
+	return 0;
+}
+
+void radeon_semaphore_emit_signal(struct radeon_device *rdev, int ring,
+			          struct radeon_semaphore *semaphore)
+{
+	--semaphore->waiters;
+	radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, false);
+}
+
+void radeon_semaphore_emit_wait(struct radeon_device *rdev, int ring,
+			        struct radeon_semaphore *semaphore)
+{
+	++semaphore->waiters;
+	radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, true);
+}
+
+/* caller must hold ring lock */
+int radeon_semaphore_sync_rings(struct radeon_device *rdev,
+				struct radeon_semaphore *semaphore,
+				int signaler, int waiter)
+{
+	int r;
+
+	/* no need to signal and wait on the same ring */
+	if (signaler == waiter) {
+		return 0;
+	}
+
+	/* prevent GPU deadlocks */
+	if (!rdev->ring[signaler].ready) {
+		dev_err(rdev->dev, "Trying to sync to a disabled ring!");
+		return -EINVAL;
+	}
+
+	r = radeon_ring_alloc(rdev, &rdev->ring[signaler], 8);
+	if (r) {
+		return r;
+	}
+	radeon_semaphore_emit_signal(rdev, signaler, semaphore);
+	radeon_ring_commit(rdev, &rdev->ring[signaler]);
+
+	/* we assume caller has already allocated space on waiters ring */
+	radeon_semaphore_emit_wait(rdev, waiter, semaphore);
+
+	/* for debugging lockup only, used by sysfs debug files */
+	rdev->ring[signaler].last_semaphore_signal_addr = semaphore->gpu_addr;
+	rdev->ring[waiter].last_semaphore_wait_addr = semaphore->gpu_addr;
+
+	return 0;
+}
+
+void radeon_semaphore_free(struct radeon_device *rdev,
+			   struct radeon_semaphore **semaphore,
+			   struct radeon_fence *fence)
+{
+	if (semaphore == NULL || *semaphore == NULL) {
+		return;
+	}
+	if ((*semaphore)->waiters > 0) {
+		dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
+			" hardware lockup imminent!\n", *semaphore);
+	}
+	radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
+	kfree(*semaphore);
+	*semaphore = NULL;
+}