drm/amd: add scheduler fence implementation (v2)

scheduler fence is based on kernel fence framework.

v2: squash in Christian's build fix

Signed-off-by: Chunming Zhou <david1.zhou@amd.com>
Reviewed-by: Christian K?nig <christian.koenig@amd.com>

1 files changed, 112 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/scheduler/sched_fence.c b/drivers/gpu/drm/amd/scheduler/sched_fence.c
new file mode 100644
index 000000000000..d580a357c547
--- /dev/null
+++ b/drivers/gpu/drm/amd/scheduler/sched_fence.c
@@ -0,0 +1,112 @@
+/*
+ * Copyright 2015 Advanced Micro Devices, Inc.
+ *
+ * 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, sublicense,
+ * 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 above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
+ *
+ *
+ */
+#include <linux/kthread.h>
+#include <linux/wait.h>
+#include <linux/sched.h>
+#include <drm/drmP.h>
+#include "gpu_scheduler.h"
+
+static void amd_sched_fence_wait_cb(struct fence *f, struct fence_cb *cb)
+{
+	struct amd_sched_fence *fence =
+		container_of(cb, struct amd_sched_fence, cb);
+	list_del_init(&fence->list);
+	fence_put(&fence->base);
+}
+
+struct amd_sched_fence *amd_sched_fence_create(
+	struct amd_sched_entity *s_entity)
+{
+	struct amd_sched_fence *fence = NULL;
+	fence = kzalloc(sizeof(struct amd_sched_fence), GFP_KERNEL);
+	if (fence == NULL)
+		return NULL;
+	fence->v_seq = atomic64_inc_return(&s_entity->last_queued_v_seq);
+	fence->entity = s_entity;
+	spin_lock_init(&fence->lock);
+	fence_init(&fence->base, &amd_sched_fence_ops,
+		&fence->lock,
+		s_entity->fence_context,
+		fence->v_seq);
+	fence_get(&fence->base);
+	list_add_tail(&fence->list, &s_entity->fence_list);
+	if (fence_add_callback(&fence->base,&fence->cb,
+			       amd_sched_fence_wait_cb)) {
+		fence_put(&fence->base);
+		kfree(fence);
+		return NULL;
+	}
+	return fence;
+}
+
+bool amd_sched_check_ts(struct amd_sched_entity *s_entity, uint64_t v_seq)
+{
+	return atomic64_read(&s_entity->last_signaled_v_seq) >= v_seq ? true : false;
+}
+
+void amd_sched_fence_signal(struct amd_sched_fence *fence)
+{
+	if (amd_sched_check_ts(fence->entity, fence->v_seq)) {
+		int ret = fence_signal_locked(&fence->base);
+		if (!ret)
+			FENCE_TRACE(&fence->base, "signaled from irq context\n");
+		else
+			FENCE_TRACE(&fence->base, "was already signaled\n");
+	} else
+		WARN(true, "fence process dismattch with job!\n");
+}
+
+static const char *amd_sched_fence_get_driver_name(struct fence *fence)
+{
+	return "amd_sched";
+}
+
+static const char *amd_sched_fence_get_timeline_name(struct fence *f)
+{
+	struct amd_sched_fence *fence = to_amd_sched_fence(f);
+	return (const char *)fence->entity->name;
+}
+
+static bool amd_sched_fence_enable_signaling(struct fence *f)
+{
+	struct amd_sched_fence *fence = to_amd_sched_fence(f);
+
+	return !amd_sched_check_ts(fence->entity, fence->v_seq);
+}
+
+static bool amd_sched_fence_is_signaled(struct fence *f)
+{
+	struct amd_sched_fence *fence = to_amd_sched_fence(f);
+
+	return amd_sched_check_ts(fence->entity, fence->v_seq);
+}
+
+const struct fence_ops amd_sched_fence_ops = {
+	.get_driver_name = amd_sched_fence_get_driver_name,
+	.get_timeline_name = amd_sched_fence_get_timeline_name,
+	.enable_signaling = amd_sched_fence_enable_signaling,
+	.signaled = amd_sched_fence_is_signaled,
+	.wait = fence_default_wait,
+	.release = NULL,
+};