drm/v3d: Add a CPU job submission

Create a new type of job, a CPU job. A CPU job is a type of job that
performs operations that requires CPU intervention. The overall idea is
to use user extensions to enable different types of CPU job, allowing the
CPU job to perform different operations according to the type of user
extension. The user extension ID identify the type of CPU job that must
be dealt.

Having a CPU job is interesting for synchronization purposes as a CPU
job has a queue like any other V3D job and can be synchoronized by the
multisync extension.

Signed-off-by: Melissa Wen <mwen@igalia.com>
Co-developed-by: Maíra Canal <mcanal@igalia.com>
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231130164420.932823-9-mcanal@igalia.com

1 files changed, 57 insertions, 0 deletions

diff --git a/drivers/gpu/drm/v3d/v3d_sched.c b/drivers/gpu/drm/v3d/v3d_sched.c
index fccbea2a5f2e..c89e92fc614c 100644
--- a/drivers/gpu/drm/v3d/v3d_sched.c
+++ b/drivers/gpu/drm/v3d/v3d_sched.c
@@ -55,6 +55,12 @@ to_csd_job(struct drm_sched_job *sched_job)
 	return container_of(sched_job, struct v3d_csd_job, base.base);
 }
 
+static struct v3d_cpu_job *
+to_cpu_job(struct drm_sched_job *sched_job)
+{
+	return container_of(sched_job, struct v3d_cpu_job, base.base);
+}
+
 static void
 v3d_sched_job_free(struct drm_sched_job *sched_job)
 {
@@ -262,6 +268,42 @@ v3d_csd_job_run(struct drm_sched_job *sched_job)
 	return fence;
 }
 
+static const v3d_cpu_job_fn cpu_job_function[] = { };
+
+static struct dma_fence *
+v3d_cpu_job_run(struct drm_sched_job *sched_job)
+{
+	struct v3d_cpu_job *job = to_cpu_job(sched_job);
+	struct v3d_dev *v3d = job->base.v3d;
+	struct v3d_file_priv *file = job->base.file->driver_priv;
+	u64 runtime;
+
+	v3d->cpu_job = job;
+
+	if (job->job_type >= ARRAY_SIZE(cpu_job_function)) {
+		DRM_DEBUG_DRIVER("Unknown CPU job: %d\n", job->job_type);
+		return NULL;
+	}
+
+	file->start_ns[V3D_CPU] = local_clock();
+	v3d->queue[V3D_CPU].start_ns = file->start_ns[V3D_CPU];
+
+	cpu_job_function[job->job_type](job);
+
+	runtime = local_clock() - file->start_ns[V3D_CPU];
+
+	file->enabled_ns[V3D_CPU] += runtime;
+	v3d->queue[V3D_CPU].enabled_ns += runtime;
+
+	file->jobs_sent[V3D_CPU]++;
+	v3d->queue[V3D_CPU].jobs_sent++;
+
+	file->start_ns[V3D_CPU] = 0;
+	v3d->queue[V3D_CPU].start_ns = 0;
+
+	return NULL;
+}
+
 static struct dma_fence *
 v3d_cache_clean_job_run(struct drm_sched_job *sched_job)
 {
@@ -416,6 +458,12 @@ static const struct drm_sched_backend_ops v3d_cache_clean_sched_ops = {
 	.free_job = v3d_sched_job_free
 };
 
+static const struct drm_sched_backend_ops v3d_cpu_sched_ops = {
+	.run_job = v3d_cpu_job_run,
+	.timedout_job = v3d_generic_job_timedout,
+	.free_job = v3d_sched_job_free
+};
+
 int
 v3d_sched_init(struct v3d_dev *v3d)
 {
@@ -471,6 +519,15 @@ v3d_sched_init(struct v3d_dev *v3d)
 			goto fail;
 	}
 
+	ret = drm_sched_init(&v3d->queue[V3D_CPU].sched,
+			     &v3d_cpu_sched_ops, NULL,
+			     DRM_SCHED_PRIORITY_COUNT,
+			     1, job_hang_limit,
+			     msecs_to_jiffies(hang_limit_ms), NULL,
+			     NULL, "v3d_cpu", v3d->drm.dev);
+	if (ret)
+		goto fail;
+
 	return 0;
 
 fail: