[PATCH 4/8] drm/ttm: enable TTM device object kerneldoc

[Alex Deucher]

On Tue, Sep 7, 2021 at 4:01 AM Christian König
<ckoenig.leichtzumerken at gmail.com> wrote:
>
> Fix the remaining warnings, switch to inline structure documentation
> and finally enable this.
>
> Signed-off-by: Christian König <christian.koenig at amd.com>
> Reviewed-by: Matthew Auld <matthew.auld at intel.com>
> ---
>  Documentation/gpu/drm-mm.rst |  9 +++++
>  include/drm/ttm/ttm_device.h | 73 +++++++++++++++++++++---------------
>  2 files changed, 51 insertions(+), 31 deletions(-)
>
> diff --git a/Documentation/gpu/drm-mm.rst b/Documentation/gpu/drm-mm.rst
> index f22c9f9a2c0e..3da81b7b4e71 100644
> --- a/Documentation/gpu/drm-mm.rst
> +++ b/Documentation/gpu/drm-mm.rst
> @@ -34,6 +34,15 @@ The Translation Table Manager (TTM)
>  .. kernel-doc:: include/drm/ttm/ttm_caching.h
>     :internal:
>
> +TTM device object reference
> +---------------------------
> +
> +.. kernel-doc:: include/drm/ttm/ttm_device.h
> +   :internal:
> +
> +.. kernel-doc:: drivers/gpu/drm/ttm/ttm_device.c
> +   :export:
> +
>  The Graphics Execution Manager (GEM)
>  ====================================
>
> diff --git a/include/drm/ttm/ttm_device.h b/include/drm/ttm/ttm_device.h
> index 07d722950d5b..0b31ec731e66 100644
> --- a/include/drm/ttm/ttm_device.h
> +++ b/include/drm/ttm/ttm_device.h
> @@ -39,31 +39,23 @@ struct ttm_operation_ctx;
>
>  /**
>   * struct ttm_global - Buffer object driver global data.
> - *
> - * @dummy_read_page: Pointer to a dummy page used for mapping requests
> - * of unpopulated pages.
> - * @shrink: A shrink callback object used for buffer object swap.
> - * @device_list_mutex: Mutex protecting the device list.
> - * This mutex is held while traversing the device list for pm options.
> - * @lru_lock: Spinlock protecting the bo subsystem lru lists.
> - * @device_list: List of buffer object devices.
> - * @swap_lru: Lru list of buffer objects used for swapping.
>   */
>  extern struct ttm_global {
>
>         /**
> -        * Constant after init.
> +        * @dummy_read_page: Pointer to a dummy page used for mapping requests
> +        * of unpopulated pages. Constant after init.
>          */
> -
>         struct page *dummy_read_page;
>
>         /**
> -        * Protected by ttm_global_mutex.
> +        * @device_list: List of buffer object devices. Protected by
> +        * ttm_global_mutex.
>          */
>         struct list_head device_list;
>
>         /**
> -        * Internal protection.
> +        * @bo_count: Number of buffer objects allocated by devices.
>          */
>         atomic_t bo_count;
>  } ttm_glob;
> @@ -230,50 +222,69 @@ struct ttm_device_funcs {
>
>  /**
>   * struct ttm_device - Buffer object driver device-specific data.
> - *
> - * @device_list: Our entry in the global device list.
> - * @funcs: Function table for the device.
> - * @sysman: Resource manager for the system domain.
> - * @man_drv: An array of resource_managers.
> - * @vma_manager: Address space manager.
> - * @pool: page pool for the device.
> - * @dev_mapping: A pointer to the struct address_space representing the
> - * device address space.
> - * @wq: Work queue structure for the delayed delete workqueue.
>   */
>  struct ttm_device {
> -       /*
> +       /**
> +        * @device_list: Our entry in the global device list.
>          * Constant after bo device init
>          */
>         struct list_head device_list;
> +
> +       /**
> +        * @funcs: Function table for the device.
> +        * Constant after bo device init
> +        */
>         struct ttm_device_funcs *funcs;
>
> -       /*
> +       /**
> +        * @sysman: Resource manager for the system domain.
>          * Access via ttm_manager_type.
>          */
>         struct ttm_resource_manager sysman;
> +
> +       /**
> +        * @man_drv: An array of resource_managers.

Might want to provide some detail as to why there are multiple
resources managers.  E.g., one per pool.

> +        */
>         struct ttm_resource_manager *man_drv[TTM_NUM_MEM_TYPES];
>
>         /*
>          * Protected by internal locks.
>          */
> +
> +       /**
> +        * @vma_manager: Address space manager for finding BOs to mmap.
> +        */
>         struct drm_vma_offset_manager *vma_manager;
> +
> +       /**
> +        * @pool: page pool for the device.
> +        */
>         struct ttm_pool pool;
>
> -       /*
> -        * Protection for the per manager LRU and ddestroy lists.
> +       /**
> +        * @lru_lock: Protection for the per manager LRU and ddestroy lists.
>          */
>         spinlock_t lru_lock;
> +
> +       /**
> +        * @ddestroy: Destroyed but not yet cleaned up buffer objects.
> +        */
>         struct list_head ddestroy;
> +
> +       /**
> +        * @pinned: Buffer object which are pinned and so not on any LRU list.

objects

> +        */
>         struct list_head pinned;
>
> -       /*
> -        * Protected by load / firstopen / lastclose /unload sync.
> +       /**
> +        * @dev_mapping: A pointer to the struct address_space for invalidating
> +        * CPU mappings on buffer move. Protected by load/unload sync.
>          */
>         struct address_space *dev_mapping;
>
> -       /*
> -        * Internal protection.
> +       /**
> +        * @wq: Work queue structure for the delayed delete workqueue. Has
> +        * internal protection.

What does internal protection imply here?

>          */
>         struct delayed_work wq;
>  };
> --
> 2.25.1
>