Release 4.18 drivers/gpu/drm/v3d/v3d_sched.c
// SPDX-License-Identifier: GPL-2.0+
/* Copyright (C) 2018 Broadcom */
/**
* DOC: Broadcom V3D scheduling
*
* The shared DRM GPU scheduler is used to coordinate submitting jobs
* to the hardware. Each DRM fd (roughly a client process) gets its
* own scheduler entity, which will process jobs in order. The GPU
* scheduler will round-robin between clients to submit the next job.
*
* For simplicity, and in order to keep latency low for interactive
* jobs when bulk background jobs are queued up, we submit a new job
* to the HW only when it has completed the last one, instead of
* filling up the CT[01]Q FIFOs with jobs. Similarly, we use
* v3d_job_dependency() to manage the dependency between bin and
* render, instead of having the clients submit jobs with using the
* HW's semaphores to interlock between them.
*/
#include <linux/kthread.h>
#include "v3d_drv.h"
#include "v3d_regs.h"
#include "v3d_trace.h"
static struct v3d_job *
to_v3d_job(struct drm_sched_job *sched_job)
{
return container_of(sched_job, struct v3d_job, base);
}
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static void
v3d_job_free(struct drm_sched_job *sched_job)
{
struct v3d_job *job = to_v3d_job(sched_job);
v3d_exec_put(job->exec);
}
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/**
* Returns the fences that the bin job depends on, one by one.
* v3d_job_run() won't be called until all of them have been signaled.
*/
static struct dma_fence *
v3d_job_dependency(struct drm_sched_job *sched_job,
struct drm_sched_entity *s_entity)
{
struct v3d_job *job = to_v3d_job(sched_job);
struct v3d_exec_info *exec = job->exec;
enum v3d_queue q = job == &exec->bin ? V3D_BIN : V3D_RENDER;
struct dma_fence *fence;
fence = job->in_fence;
if (fence) {
job->in_fence = NULL;
return fence;
}
if (q == V3D_RENDER) {
/* If we had a bin job, the render job definitely depends on
* it. We first have to wait for bin to be scheduled, so that
* its done_fence is created.
*/
fence = exec->bin_done_fence;
if (fence) {
exec->bin_done_fence = NULL;
return fence;
}
}
/* XXX: Wait on a fence for switching the GMP if necessary,
* and then do so.
*/
return fence;
}
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static struct dma_fence *v3d_job_run(struct drm_sched_job *sched_job)
{
struct v3d_job *job = to_v3d_job(sched_job);
struct v3d_exec_info *exec = job->exec;
enum v3d_queue q = job == &exec->bin ? V3D_BIN : V3D_RENDER;
struct v3d_dev *v3d = exec->v3d;
struct drm_device *dev = &v3d->drm;
struct dma_fence *fence;
unsigned long irqflags;
if (unlikely(job->base.s_fence->finished.error))
return NULL;
/* Lock required around bin_job update vs
* v3d_overflow_mem_work().
*/
spin_lock_irqsave(&v3d->job_lock, irqflags);
if (q == V3D_BIN) {
v3d->bin_job = job->exec;
/* Clear out the overflow allocation, so we don't
* reuse the overflow attached to a previous job.
*/
V3D_CORE_WRITE(0, V3D_PTB_BPOS, 0);
} else {
v3d->render_job = job->exec;
}
spin_unlock_irqrestore(&v3d->job_lock, irqflags);
/* Can we avoid this flush when q==RENDER? We need to be
* careful of scheduling, though -- imagine job0 rendering to
* texture and job1 reading, and them being executed as bin0,
* bin1, render0, render1, so that render1's flush at bin time
* wasn't enough.
*/
v3d_invalidate_caches(v3d);
fence = v3d_fence_create(v3d, q);
if (!fence)
return fence;
if (job->done_fence)
dma_fence_put(job->done_fence);
job->done_fence = dma_fence_get(fence);
trace_v3d_submit_cl(dev, q == V3D_RENDER, to_v3d_fence(fence)->seqno,
job->start, job->end);
if (q == V3D_BIN) {
if (exec->qma) {
V3D_CORE_WRITE(0, V3D_CLE_CT0QMA, exec->qma);
V3D_CORE_WRITE(0, V3D_CLE_CT0QMS, exec->qms);
}
if (exec->qts) {
V3D_CORE_WRITE(0, V3D_CLE_CT0QTS,
V3D_CLE_CT0QTS_ENABLE |
exec->qts);
}
} else {
/* XXX: Set the QCFG */
}
/* Set the current and end address of the control list.
* Writing the end register is what starts the job.
*/
V3D_CORE_WRITE(0, V3D_CLE_CTNQBA(q), job->start);
V3D_CORE_WRITE(0, V3D_CLE_CTNQEA(q), job->end);
return fence;
}
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static void
v3d_job_timedout(struct drm_sched_job *sched_job)
{
struct v3d_job *job = to_v3d_job(sched_job);
struct v3d_exec_info *exec = job->exec;
struct v3d_dev *v3d = exec->v3d;
enum v3d_queue q;
mutex_lock(&v3d->reset_lock);
/* block scheduler */
for (q = 0; q < V3D_MAX_QUEUES; q++) {
struct drm_gpu_scheduler *sched = &v3d->queue[q].sched;
kthread_park(sched->thread);
drm_sched_hw_job_reset(sched, (sched_job->sched == sched ?
sched_job : NULL));
}
/* get the GPU back into the init state */
v3d_reset(v3d);
/* Unblock schedulers and restart their jobs. */
for (q = 0; q < V3D_MAX_QUEUES; q++) {
drm_sched_job_recovery(&v3d->queue[q].sched);
kthread_unpark(v3d->queue[q].sched.thread);
}
mutex_unlock(&v3d->reset_lock);
}
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static const struct drm_sched_backend_ops v3d_sched_ops = {
.dependency = v3d_job_dependency,
.run_job = v3d_job_run,
.timedout_job = v3d_job_timedout,
.free_job = v3d_job_free
};
int
v3d_sched_init(struct v3d_dev *v3d)
{
int hw_jobs_limit = 1;
int job_hang_limit = 0;
int hang_limit_ms = 500;
int ret;
ret = drm_sched_init(&v3d->queue[V3D_BIN].sched,
&v3d_sched_ops,
hw_jobs_limit, job_hang_limit,
msecs_to_jiffies(hang_limit_ms),
"v3d_bin");
if (ret) {
dev_err(v3d->dev, "Failed to create bin scheduler: %d.", ret);
return ret;
}
ret = drm_sched_init(&v3d->queue[V3D_RENDER].sched,
&v3d_sched_ops,
hw_jobs_limit, job_hang_limit,
msecs_to_jiffies(hang_limit_ms),
"v3d_render");
if (ret) {
dev_err(v3d->dev, "Failed to create render scheduler: %d.",
ret);
drm_sched_fini(&v3d->queue[V3D_BIN].sched);
return ret;
}
return 0;
}
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void
v3d_sched_fini(struct v3d_dev *v3d)
{
enum v3d_queue q;
for (q = 0; q < V3D_MAX_QUEUES; q++)
drm_sched_fini(&v3d->queue[q].sched);
}
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