drm/v3d: Don't run jobs that have errors flagged in its fence

commit 80cbee810e4e13cdbd3ae9654e9ecddf17f3e828 upstream.

The V3D driver still relies on `drm_sched_increase_karma()` and
`drm_sched_resubmit_jobs()` for resubmissions when a timeout occurs.
The function `drm_sched_increase_karma()` marks the job as guilty, while
`drm_sched_resubmit_jobs()` sets an error (-ECANCELED) in the DMA fence of
that guilty job.

Because of this, we must check whether the job’s DMA fence has been
flagged with an error before executing the job. Otherwise, the same guilty
job may be resubmitted indefinitely, causing repeated GPU resets.

This patch adds a check for an error on the job's fence to prevent running
a guilty job that was previously flagged when the GPU timed out.

Note that the CPU and CACHE_CLEAN queues do not require this check, as
their jobs are executed synchronously once the DRM scheduler starts them.

Cc: stable@vger.kernel.org
Fixes: d223f98f0209 ("drm/v3d: Add support for compute shader dispatch.")
Fixes: 1584f16ca96e ("drm/v3d: Add support for submitting jobs to the TFU.")
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250313-v3d-gpu-reset-fixes-v4-1-c1e780d8e096@igalia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/v3d/v3d_sched.c b/drivers/gpu/drm/v3d/v3d_sched.c
index 4f935f1d50a943d20934d84a7a565edf972b2d2f..3066cfdb054cc0860b3d6feb61e7d488fc8c5418 100644 (file)
--- a/drivers/gpu/drm/v3d/v3d_sched.c
+++ b/drivers/gpu/drm/v3d/v3d_sched.c
@@ -319,11 +319,15 @@ v3d_tfu_job_run(struct drm_sched_job *sched_job)
        struct drm_device *dev = &v3d->drm;
        struct dma_fence *fence;
 
+       if (unlikely(job->base.base.s_fence->finished.error))
+               return NULL;
+
+       v3d->tfu_job = job;
+
        fence = v3d_fence_create(v3d, V3D_TFU);
        if (IS_ERR(fence))
                return NULL;
 
-       v3d->tfu_job = job;
        if (job->base.irq_fence)
                dma_fence_put(job->base.irq_fence);
        job->base.irq_fence = dma_fence_get(fence);
@@ -361,6 +365,9 @@ v3d_csd_job_run(struct drm_sched_job *sched_job)
        struct dma_fence *fence;
        int i, csd_cfg0_reg;
 
+       if (unlikely(job->base.base.s_fence->finished.error))
+               return NULL;
+
        v3d->csd_job = job;
 
        v3d_invalidate_caches(v3d);