[PATCH v6 04/12] drm/panfrost: Handle error when allocating AS number

[Adrián Larumbe]

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

Reviewed-by: Steven Price <steven.pr...@arm.com>
Reviewed-by: Boris Brezillon <boris.brezil...@collabora.com>
Signed-off-by: Adrián Larumbe <adrian.laru...@collabora.com>
---
 drivers/gpu/drm/panfrost/panfrost_job.c     | 6 +++++-
 drivers/gpu/drm/panfrost/panfrost_mmu.c     | 5 +++--
 drivers/gpu/drm/panfrost/panfrost_mmu.h     | 2 +-
 drivers/gpu/drm/panfrost/panfrost_perfcnt.c | 8 ++++++--
 4 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c 
b/drivers/gpu/drm/panfrost/panfrost_job.c
index 0722f297d142..d53e9db945ad 100644
--- a/drivers/gpu/drm/panfrost/panfrost_job.c
+++ b/drivers/gpu/drm/panfrost/panfrost_job.c
@@ -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);
 
diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c 
b/drivers/gpu/drm/panfrost/panfrost_mmu.c
index 1d696eeea2fa..cf272b167feb 100644
--- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
+++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c
@@ -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 +300,8 @@ 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))
+                       return -EBUSY;
 
                list_del_init(&lru_mmu->list);
                as = lru_mmu->as;
diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.h 
b/drivers/gpu/drm/panfrost/panfrost_mmu.h
index 022a9a74a114..e6e6966a0cca 100644
--- a/drivers/gpu/drm/panfrost/panfrost_mmu.h
+++ b/drivers/gpu/drm/panfrost/panfrost_mmu.h
@@ -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);
diff --git a/drivers/gpu/drm/panfrost/panfrost_perfcnt.c 
b/drivers/gpu/drm/panfrost/panfrost_perfcnt.c
index 718eb44b40f8..7020c0192e18 100644
--- a/drivers/gpu/drm/panfrost/panfrost_perfcnt.c
+++ b/drivers/gpu/drm/panfrost/panfrost_perfcnt.c
@@ -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:
-- 
2.51.0