[PATCH v3 1/4] drm/ttm: Create pinned list
Christian König
christian.koenig at amd.com
Mon Aug 30 08:58:58 UTC 2021
Am 27.08.21 um 22:39 schrieb Andrey Grodzovsky:
> This list will be used to capture all non VRAM BOs not
> on LRU so when device is hot unplugged we can iterate
> the list and unmap DMA mappings before device is removed.
>
> v2: Reanme function to ttm_bo_move_to_pinned
> v3: Move the pinned list to ttm device
As far as I can see there is not list_del() remaining. So this won't
work correctly.
I suggest to rather rebase on top of the stuff I'm working on for a
while to move the LRU into the resource instead.
Just send out the latest patch set of this with you in CC.
Christian.
>
> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
> Suggested-by: Christian König <christian.koenig at amd.com>
> ---
> drivers/gpu/drm/ttm/ttm_bo.c | 18 ++++++++++++++----
> drivers/gpu/drm/ttm/ttm_device.c | 1 +
> include/drm/ttm/ttm_device.h | 1 +
> 3 files changed, 16 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
> index 1b950b45cf4b..1fedd0eb67ba 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
> @@ -69,7 +69,17 @@ static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
> }
> }
>
> -static void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
> +static inline void ttm_bo_move_to_pinned(struct ttm_buffer_object *bo)
> +{
> + struct ttm_device *bdev = bo->bdev;
> +
> + list_move_tail(&bo->lru, &bdev->pinned);
> +
> + if (bdev->funcs->del_from_lru_notify)
> + bdev->funcs->del_from_lru_notify(bo);
> +}
> +
> +static inline void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
> {
> struct ttm_device *bdev = bo->bdev;
>
> @@ -98,7 +108,7 @@ void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
> dma_resv_assert_held(bo->base.resv);
>
> if (bo->pin_count) {
> - ttm_bo_del_from_lru(bo);
> + ttm_bo_move_to_pinned(bo);
> return;
> }
>
> @@ -339,7 +349,7 @@ static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
> return ret;
> }
>
> - ttm_bo_del_from_lru(bo);
> + ttm_bo_move_to_pinned(bo);
> list_del_init(&bo->ddestroy);
> spin_unlock(&bo->bdev->lru_lock);
> ttm_bo_cleanup_memtype_use(bo);
> @@ -1154,7 +1164,7 @@ int ttm_bo_swapout(struct ttm_buffer_object *bo, struct ttm_operation_ctx *ctx,
> return 0;
> }
>
> - ttm_bo_del_from_lru(bo);
> + ttm_bo_move_to_pinned(bo);
> /* TODO: Cleanup the locking */
> spin_unlock(&bo->bdev->lru_lock);
>
> diff --git a/drivers/gpu/drm/ttm/ttm_device.c b/drivers/gpu/drm/ttm/ttm_device.c
> index 5f31acec3ad7..530a9c36be37 100644
> --- a/drivers/gpu/drm/ttm/ttm_device.c
> +++ b/drivers/gpu/drm/ttm/ttm_device.c
> @@ -208,6 +208,7 @@ int ttm_device_init(struct ttm_device *bdev, struct ttm_device_funcs *funcs,
> INIT_DELAYED_WORK(&bdev->wq, ttm_device_delayed_workqueue);
> spin_lock_init(&bdev->lru_lock);
> INIT_LIST_HEAD(&bdev->ddestroy);
> + INIT_LIST_HEAD(&bdev->pinned);
> bdev->dev_mapping = mapping;
> mutex_lock(&ttm_global_mutex);
> list_add_tail(&bdev->device_list, &glob->device_list);
> diff --git a/include/drm/ttm/ttm_device.h b/include/drm/ttm/ttm_device.h
> index cd592f8e941b..03fb44d061e0 100644
> --- a/include/drm/ttm/ttm_device.h
> +++ b/include/drm/ttm/ttm_device.h
> @@ -265,6 +265,7 @@ struct ttm_device {
> */
> spinlock_t lru_lock;
> struct list_head ddestroy;
> + struct list_head pinned;
>
> /*
> * Protected by load / firstopen / lastclose /unload sync.
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