[PATCH v3 05/12] drm/ttm: add some kernel-doc for TTM_PAGE_FLAG_*

[Matthew Auld]

Move it to inline kernel-doc, otherwise we can't add empty lines it
seems. Also drop the kernel-doc for pages_list, which doesn't seem to
exist, and get rid of all the strange holes.

Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Cc: Thomas Hellström <thomas.hellstrom at linux.intel.com>
Cc: Christian König <christian.koenig at amd.com>
---
 include/drm/ttm/ttm_tt.h | 57 ++++++++++++++++++++++++++--------------
 1 file changed, 38 insertions(+), 19 deletions(-)

diff --git a/include/drm/ttm/ttm_tt.h b/include/drm/ttm/ttm_tt.h
index a6c284c21e72..7f54a83c95ef 100644
--- a/include/drm/ttm/ttm_tt.h
+++ b/include/drm/ttm/ttm_tt.h
@@ -38,35 +38,54 @@ struct ttm_resource;
 struct ttm_buffer_object;
 struct ttm_operation_ctx;
 
-#define TTM_PAGE_FLAG_SWAPPED		(1 << 4)
-#define TTM_PAGE_FLAG_ZERO_ALLOC	(1 << 6)
-#define TTM_PAGE_FLAG_EXTERNAL		(1 << 8)
-
-#define TTM_PAGE_FLAG_PRIV_POPULATED  (1 << 31)
-
 /**
- * struct ttm_tt
- *
- * @pages: Array of pages backing the data.
- * @page_flags: see TTM_PAGE_FLAG_*
- * @num_pages: Number of pages in the page array.
- * @sg: for SG objects via dma-buf
- * @dma_address: The DMA (bus) addresses of the pages
- * @swap_storage: Pointer to shmem struct file for swap storage.
- * @pages_list: used by some page allocation backend
- * @caching: The current caching state of the pages, see enum ttm_caching.
- *
- * This is a structure holding the pages, caching- and aperture binding
- * status for a buffer object that isn't backed by fixed (VRAM / AGP)
+ * struct ttm_tt - This is a structure holding the pages, caching- and aperture
+ * binding status for a buffer object that isn't backed by fixed (VRAM / AGP)
  * memory.
  */
 struct ttm_tt {
+	/** @pages: Array of pages backing the data. */
 	struct page **pages;
+	/**
+	 * @page_flags: The page flags.
+	 *
+	 * Supported values:
+	 *
+	 * TTM_PAGE_FLAG_SWAPPED: Set if the pages have been swapped out.
+	 * Calling ttm_tt_populate() will swap the pages back in, and unset the
+	 * flag.
+	 *
+	 * TTM_PAGE_FLAG_ZERO_ALLOC: Set if the pages will be zeroed on
+	 * allocation.
+	 *
+	 * TTM_PAGE_FLAG_EXTERNAL: Set if the underlying pages were allocated
+	 * externally, like with dma-buf or userptr. This effectively disables
+	 * TTM swapping out such pages.  Also important is to prevent TTM from
+	 * ever directly mapping these pages.
+	 *
+	 * Note that enum ttm_bo_type.ttm_bo_type_sg objects will always enable
+	 * this flag.
+	 *
+	 * TTM_PAGE_FLAG_PRIV_POPULATED: TTM internal only. DO NOT USE.
+	 */
+#define TTM_PAGE_FLAG_SWAPPED		(1 << 0)
+#define TTM_PAGE_FLAG_ZERO_ALLOC	(1 << 1)
+#define TTM_PAGE_FLAG_EXTERNAL		(1 << 2)
+
+#define TTM_PAGE_FLAG_PRIV_POPULATED	(1 << 31)
 	uint32_t page_flags;
+	/** @num_pages: Number of pages in the page array. */
 	uint32_t num_pages;
+	/** @sg: for SG objects via dma-buf. */
 	struct sg_table *sg;
+	/** @dma_address: The DMA (bus) addresses of the pages. */
 	dma_addr_t *dma_address;
+	/** @swap_storage: Pointer to shmem struct file for swap storage. */
 	struct file *swap_storage;
+	/**
+	 * @caching: The current caching state of the pages, see enum
+	 * ttm_caching.
+	 */
 	enum ttm_caching caching;
 };
 
-- 
2.26.3