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drm/panfrost: Handle error when allocating AS number

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If we reach the beginning of the LRU AS list, then return an error.

Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com>
Link: https://lore.kernel.org/r/20251019145225.3621989-5-adrian.larumbe@collabora.com
Signed-off-by: Steven Price <steven.price@arm.com>
This commit is contained in:
Adrián Larumbe
2025-10-19 15:52:09 +01:00
committed by Steven Price
parent 616c5b6fe3
commit f45f73c68c
4 changed files with 17 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/gpu/drm/panfrost/panfrost_job.c
View File

@@ -217,7 +217,11 @@ static int panfrost_job_hw_submit(struct panfrost_job *job, int js)
goto err_hwsubmit;
}
cfg = panfrost_mmu_as_get(pfdev, job->mmu);
ret = panfrost_mmu_as_get(pfdev, job->mmu);
if (ret < 0)
goto err_hwsubmit;
cfg = ret;
panfrost_devfreq_record_busy(&pfdev->pfdevfreq);

7
drivers/gpu/drm/panfrost/panfrost_mmu.c
View File

@@ -258,7 +258,7 @@ static int panfrost_mmu_cfg_init(struct panfrost_mmu *mmu,
}
}
u32 panfrost_mmu_as_get(struct panfrost_device *pfdev, struct panfrost_mmu *mmu)
int panfrost_mmu_as_get(struct panfrost_device *pfdev, struct panfrost_mmu *mmu)
{
int as;
@@ -300,7 +300,10 @@ u32 panfrost_mmu_as_get(struct panfrost_device *pfdev, struct panfrost_mmu *mmu)
if (!atomic_read(&lru_mmu->as_count))
break;
}
WARN_ON(&lru_mmu->list == &pfdev->as_lru_list);
if (WARN_ON(&lru_mmu->list == &pfdev->as_lru_list)) {
as = -EBUSY;
goto out;
}
list_del_init(&lru_mmu->list);
as = lru_mmu->as;

2
drivers/gpu/drm/panfrost/panfrost_mmu.h
View File

@@ -16,7 +16,7 @@ void panfrost_mmu_fini(struct panfrost_device *pfdev);
void panfrost_mmu_reset(struct panfrost_device *pfdev);
void panfrost_mmu_suspend_irq(struct panfrost_device *pfdev);
u32 panfrost_mmu_as_get(struct panfrost_device *pfdev, struct panfrost_mmu *mmu);
int panfrost_mmu_as_get(struct panfrost_device *pfdev, struct panfrost_mmu *mmu);
void panfrost_mmu_as_put(struct panfrost_device *pfdev, struct panfrost_mmu *mmu);
struct panfrost_mmu *panfrost_mmu_ctx_get(struct panfrost_mmu *mmu);

8
drivers/gpu/drm/panfrost/panfrost_perfcnt.c
View File

@@ -130,9 +130,11 @@ static int panfrost_perfcnt_enable_locked(struct panfrost_device *pfdev,
goto err_vunmap;
}
perfcnt->user = user;
ret = panfrost_mmu_as_get(pfdev, perfcnt->mapping->mmu);
if (ret < 0)
goto err_vunmap;
as = panfrost_mmu_as_get(pfdev, perfcnt->mapping->mmu);
as = ret;
cfg = GPU_PERFCNT_CFG_AS(as) |
GPU_PERFCNT_CFG_MODE(GPU_PERFCNT_CFG_MODE_MANUAL);
@@ -164,6 +166,8 @@ static int panfrost_perfcnt_enable_locked(struct panfrost_device *pfdev,
/* The BO ref is retained by the mapping. */
drm_gem_object_put(&bo->base);
perfcnt->user = user;
return 0;
err_vunmap: