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drm/ttm: add some kernel-doc for TTM_TT_FLAG_*
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. v2(Christian): - Add a note that FLAG_SWAPPED shouldn't need to be touched by drivers. - Mention what FLAG_POPULATED does. Signed-off-by: Matthew Auld <matthew.auld@intel.com> Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com> Cc: Christian König <christian.koenig@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210929132629.353541-2-matthew.auld@intel.com Signed-off-by: Christian König <christian.koenig@amd.com>
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@ -38,35 +38,57 @@ struct ttm_resource;
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struct ttm_buffer_object;
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struct ttm_operation_ctx;
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/**
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* struct ttm_tt - This is a structure holding the pages, caching- and aperture
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* binding status for a buffer object that isn't backed by fixed (VRAM / AGP)
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* memory.
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*/
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struct ttm_tt {
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/** @pages: Array of pages backing the data. */
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struct page **pages;
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/**
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* @page_flags: The page flags.
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*
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* Supported values:
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*
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* TTM_TT_FLAG_SWAPPED: Set by TTM when the pages have been unpopulated
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* and swapped out by TTM. Calling ttm_tt_populate() will then swap the
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* pages back in, and unset the flag. Drivers should in general never
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* need to touch this.
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*
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* TTM_TT_FLAG_ZERO_ALLOC: Set if the pages will be zeroed on
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* allocation.
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*
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* TTM_TT_FLAG_EXTERNAL: Set if the underlying pages were allocated
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* externally, like with dma-buf or userptr. This effectively disables
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* TTM swapping out such pages. Also important is to prevent TTM from
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* ever directly mapping these pages.
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*
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* Note that enum ttm_bo_type.ttm_bo_type_sg objects will always enable
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* this flag.
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*
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* TTM_TT_FLAG_PRIV_POPULATED: TTM internal only. DO NOT USE. This is
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* set by TTM after ttm_tt_populate() has successfully returned, and is
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* then unset when TTM calls ttm_tt_unpopulate().
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*/
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#define TTM_TT_FLAG_SWAPPED (1 << 0)
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#define TTM_TT_FLAG_ZERO_ALLOC (1 << 1)
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#define TTM_TT_FLAG_EXTERNAL (1 << 2)
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#define TTM_TT_FLAG_PRIV_POPULATED (1 << 31)
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/**
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* struct ttm_tt
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*
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* @pages: Array of pages backing the data.
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* @page_flags: see TTM_TT_FLAG_*
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* @num_pages: Number of pages in the page array.
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* @sg: for SG objects via dma-buf
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* @dma_address: The DMA (bus) addresses of the pages
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* @swap_storage: Pointer to shmem struct file for swap storage.
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* @pages_list: used by some page allocation backend
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* @caching: The current caching state of the pages, see enum ttm_caching.
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*
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* This is a structure holding the pages, caching- and aperture binding
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* status for a buffer object that isn't backed by fixed (VRAM / AGP)
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* memory.
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*/
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struct ttm_tt {
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struct page **pages;
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uint32_t page_flags;
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/** @num_pages: Number of pages in the page array. */
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uint32_t num_pages;
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/** @sg: for SG objects via dma-buf. */
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struct sg_table *sg;
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/** @dma_address: The DMA (bus) addresses of the pages. */
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dma_addr_t *dma_address;
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/** @swap_storage: Pointer to shmem struct file for swap storage. */
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struct file *swap_storage;
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/**
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* @caching: The current caching state of the pages, see enum
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* ttm_caching.
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*/
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enum ttm_caching caching;
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};
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