drm/amdgpu: add backend implementation of gpu scheduler (v2)

v2: fix rebase breakage

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

drivers/gpu/drm/amd/amdgpu/Makefile

@@ -85,7 +85,8 @@ amdgpu-y += amdgpu_cgs.o
 
 # GPU scheduler
 amdgpu-y += \
-	../scheduler/gpu_scheduler.o
+	../scheduler/gpu_scheduler.o \
+	amdgpu_sched.o
 
 amdgpu-$(CONFIG_COMPAT) += amdgpu_ioc32.o
 amdgpu-$(CONFIG_VGA_SWITCHEROO) += amdgpu_atpx_handler.o

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -416,6 +416,7 @@ struct amdgpu_user_fence {
 	struct amdgpu_bo 	*bo;
 	/* write-back address offset to bo start */
 	uint32_t                offset;
+	uint64_t                sequence;
 };
 
 int amdgpu_fence_driver_init(struct amdgpu_device *adev);
@@ -859,6 +860,8 @@ enum amdgpu_ring_type {
 	AMDGPU_RING_TYPE_VCE
 };
 
+extern struct amd_sched_backend_ops amdgpu_sched_ops;
+
 struct amdgpu_ring {
 	struct amdgpu_device		*adev;
 	const struct amdgpu_ring_funcs	*funcs;
@@ -1232,6 +1235,11 @@ struct amdgpu_cs_parser {
 
 	/* user fence */
 	struct amdgpu_user_fence uf;
+
+	struct mutex job_lock;
+	struct work_struct job_work;
+	int (*prepare_job)(struct amdgpu_cs_parser *sched_job);
+	int (*run_job)(struct amdgpu_cs_parser *sched_job);
 };
 
 static inline u32 amdgpu_get_ib_value(struct amdgpu_cs_parser *p, uint32_t ib_idx, int idx)

drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c

@@ -905,7 +905,8 @@ void amdgpu_fence_driver_init_ring(struct amdgpu_ring *ring)
 
 	if (amdgpu_enable_scheduler) {
 		ring->scheduler = amd_sched_create((void *)ring->adev,
-						   NULL, ring->idx, 5, 0);
+						   &amdgpu_sched_ops,
+						   ring->idx, 5, 0);
 		if (!ring->scheduler)
 			DRM_ERROR("Failed to create scheduler on ring %d.\n",
 				  ring->idx);

drivers/gpu/drm/amd/amdgpu/amdgpu_sched.c

@@ -0,0 +1,107 @@
+/*
+ * 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 "amdgpu.h"
+
+static int amdgpu_sched_prepare_job(struct amd_gpu_scheduler *sched,
+				    struct amd_context_entity *c_entity,
+				    void *job)
+{
+	int r = 0;
+	struct amdgpu_cs_parser *sched_job = (struct amdgpu_cs_parser *)job;
+	if (sched_job->prepare_job)
+		r = sched_job->prepare_job(sched_job);
+	if (r) {
+		DRM_ERROR("Prepare job error\n");
+		schedule_work(&sched_job->job_work);
+	}
+	return r;
+}
+
+static void amdgpu_sched_run_job(struct amd_gpu_scheduler *sched,
+				 struct amd_context_entity *c_entity,
+				 void *job)
+{
+	int r = 0;
+	struct amdgpu_cs_parser *sched_job = (struct amdgpu_cs_parser *)job;
+
+	mutex_lock(&sched_job->job_lock);
+	r = amdgpu_ib_schedule(sched_job->adev,
+			       sched_job->num_ibs,
+			       sched_job->ibs,
+			       sched_job->filp);
+	if (r)
+		goto err;
+
+	if (sched_job->run_job) {
+		r = sched_job->run_job(sched_job);
+		if (r)
+			goto err;
+	}
+	mutex_unlock(&sched_job->job_lock);
+	return;
+err:
+	DRM_ERROR("Run job error\n");
+	mutex_unlock(&sched_job->job_lock);
+	schedule_work(&sched_job->job_work);
+}
+
+static void amdgpu_sched_process_job(struct amd_gpu_scheduler *sched, void *job)
+{
+	struct amdgpu_cs_parser *sched_job = NULL;
+	struct amdgpu_fence *fence = NULL;
+	struct amdgpu_ring *ring = NULL;
+	struct amdgpu_device *adev = NULL;
+	struct amd_context_entity *c_entity = NULL;
+
+	if (!job)
+		return;
+	sched_job = (struct amdgpu_cs_parser *)job;
+	fence = sched_job->ibs[sched_job->num_ibs - 1].fence;
+	if (!fence)
+		return;
+	ring = fence->ring;
+	adev = ring->adev;
+
+	if (sched_job->ctx) {
+		c_entity = &sched_job->ctx->rings[ring->idx].c_entity;
+		atomic64_set(&c_entity->last_signaled_v_seq,
+			     sched_job->uf.sequence);
+	}
+
+	/* wake up users waiting for time stamp */
+	wake_up_all(&c_entity->wait_queue);
+
+	schedule_work(&sched_job->job_work);
+}
+
+struct amd_sched_backend_ops amdgpu_sched_ops = {
+	.prepare_job = amdgpu_sched_prepare_job,
+	.run_job = amdgpu_sched_run_job,
+	.process_job = amdgpu_sched_process_job
+};
+