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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2017 Etnaviv Project
*/
#include <linux/kthread.h>
#include "etnaviv_drv.h"
#include "etnaviv_dump.h"
#include "etnaviv_gem.h"
#include "etnaviv_gpu.h"
#include "etnaviv_sched.h"
#include "state.xml.h"
static int etnaviv_job_hang_limit = 0;
module_param_named(job_hang_limit, etnaviv_job_hang_limit, int , 0444);
static int etnaviv_hw_jobs_limit = 4;
module_param_named(hw_job_limit, etnaviv_hw_jobs_limit, int , 0444);
static struct dma_fence *
etnaviv_sched_dependency(struct drm_sched_job *sched_job,
struct drm_sched_entity *entity)
{
struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
struct dma_fence *fence;
int i;
if (unlikely(submit->in_fence)) {
fence = submit->in_fence;
submit->in_fence = NULL;
if (!dma_fence_is_signaled(fence))
return fence;
dma_fence_put(fence);
}
for (i = 0; i < submit->nr_bos; i++) {
struct etnaviv_gem_submit_bo *bo = &submit->bos[i];
int j;
if (bo->excl) {
fence = bo->excl;
bo->excl = NULL;
if (!dma_fence_is_signaled(fence))
return fence;
dma_fence_put(fence);
}
for (j = 0; j < bo->nr_shared; j++) {
if (!bo->shared[j])
continue;
fence = bo->shared[j];
bo->shared[j] = NULL;
if (!dma_fence_is_signaled(fence))
return fence;
dma_fence_put(fence);
}
kfree(bo->shared);
bo->nr_shared = 0;
bo->shared = NULL;
}
return NULL;
}
static struct dma_fence *etnaviv_sched_run_job(struct drm_sched_job *sched_job)
{
struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
struct dma_fence *fence = NULL;
if (likely(!sched_job->s_fence->finished.error))
fence = etnaviv_gpu_submit(submit);
else
dev_dbg(submit->gpu->dev, "skipping bad job\n");
return fence;
}
static void etnaviv_sched_timedout_job(struct drm_sched_job *sched_job)
{
struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
struct etnaviv_gpu *gpu = submit->gpu;
u32 dma_addr;
int change;
/*
* If the GPU managed to complete this jobs fence, the timout is
* spurious. Bail out.
*/
if (fence_completed(gpu, submit->out_fence->seqno))
return;
/*
* If the GPU is still making forward progress on the front-end (which
* should never loop) we shift out the timeout to give it a chance to
* finish the job.
*/
dma_addr = gpu_read(gpu, VIVS_FE_DMA_ADDRESS);
change = dma_addr - gpu->hangcheck_dma_addr;
if (change < 0 || change > 16) {
gpu->hangcheck_dma_addr = dma_addr;
schedule_delayed_work(&sched_job->sched->work_tdr,
sched_job->sched->timeout);
return;
}
/* block scheduler */
kthread_park(gpu->sched.thread);
drm_sched_hw_job_reset(&gpu->sched, sched_job);
/* get the GPU back into the init state */
etnaviv_core_dump(gpu);
etnaviv_gpu_recover_hang(gpu);
/* restart scheduler after GPU is usable again */
drm_sched_job_recovery(&gpu->sched);
kthread_unpark(gpu->sched.thread);
}
static void etnaviv_sched_free_job(struct drm_sched_job *sched_job)
{
struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
etnaviv_submit_put(submit);
}
static const struct drm_sched_backend_ops etnaviv_sched_ops = {
.dependency = etnaviv_sched_dependency,
.run_job = etnaviv_sched_run_job,
.timedout_job = etnaviv_sched_timedout_job,
.free_job = etnaviv_sched_free_job,
};
int etnaviv_sched_push_job(struct drm_sched_entity *sched_entity,
struct etnaviv_gem_submit *submit)
{
int ret = 0;
/*
* Hold the fence lock across the whole operation to avoid jobs being
* pushed out of order with regard to their sched fence seqnos as
* allocated in drm_sched_job_init.
*/
mutex_lock(&submit->gpu->fence_lock);
ret = drm_sched_job_init(&submit->sched_job, sched_entity,
submit->cmdbuf.ctx);
if (ret)
goto out_unlock;
submit->out_fence = dma_fence_get(&submit->sched_job.s_fence->finished);
submit->out_fence_id = idr_alloc_cyclic(&submit->gpu->fence_idr,
submit->out_fence, 0,
INT_MAX, GFP_KERNEL);
if (submit->out_fence_id < 0) {
ret = -ENOMEM;
goto out_unlock;
}
/* the scheduler holds on to the job now */
kref_get(&submit->refcount);
drm_sched_entity_push_job(&submit->sched_job, sched_entity);
out_unlock:
mutex_unlock(&submit->gpu->fence_lock);
return ret;
}
int etnaviv_sched_init(struct etnaviv_gpu *gpu)
{
int ret;
ret = drm_sched_init(&gpu->sched, &etnaviv_sched_ops,
etnaviv_hw_jobs_limit, etnaviv_job_hang_limit,
msecs_to_jiffies(500), dev_name(gpu->dev));
if (ret)
return ret;
return 0;
}
void etnaviv_sched_fini(struct etnaviv_gpu *gpu)
{
drm_sched_fini(&gpu->sched);
}
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