258 lines
8.2 KiB
C
258 lines
8.2 KiB
C
/**************************************************************************
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*
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* Copyright (c) 2006-2009 Vmware, Inc., Palo Alto, CA., USA
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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#ifndef _TTM_TT_H_
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#define _TTM_TT_H_
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#include <linux/pagemap.h>
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#include <linux/types.h>
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#include <drm/ttm/ttm_caching.h>
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#include <drm/ttm/ttm_kmap_iter.h>
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struct ttm_device;
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struct ttm_tt;
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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_EXTERNAL_MAPPABLE: Same behaviour as
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* TTM_TT_FLAG_EXTERNAL, but with the reduced restriction that it is
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* still valid to use TTM to map the pages directly. This is useful when
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* implementing a ttm_tt backend which still allocates driver owned
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* pages underneath(say with shmem).
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*
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* Note that since this also implies TTM_TT_FLAG_EXTERNAL, the usage
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* here should always be:
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*
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* page_flags = TTM_TT_FLAG_EXTERNAL |
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* TTM_TT_FLAG_EXTERNAL_MAPPABLE;
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*
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* TTM_TT_FLAG_DECRYPTED: The mapped ttm pages should be marked as
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* not encrypted. The framework will try to match what the dma layer
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* is doing, but note that it is a little fragile because ttm page
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* fault handling abuses the DMA api a bit and dma_map_attrs can't be
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* used to assure pgprot always matches.
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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 BIT(0)
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#define TTM_TT_FLAG_ZERO_ALLOC BIT(1)
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#define TTM_TT_FLAG_EXTERNAL BIT(2)
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#define TTM_TT_FLAG_EXTERNAL_MAPPABLE BIT(3)
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#define TTM_TT_FLAG_DECRYPTED BIT(4)
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#define TTM_TT_FLAG_PRIV_POPULATED BIT(5)
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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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/**
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* struct ttm_kmap_iter_tt - Specialization of a mappig iterator for a tt.
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* @base: Embedded struct ttm_kmap_iter providing the usage interface
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* @tt: Cached struct ttm_tt.
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* @prot: Cached page protection for mapping.
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*/
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struct ttm_kmap_iter_tt {
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struct ttm_kmap_iter base;
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struct ttm_tt *tt;
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pgprot_t prot;
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};
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static inline bool ttm_tt_is_populated(struct ttm_tt *tt)
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{
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return tt->page_flags & TTM_TT_FLAG_PRIV_POPULATED;
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}
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/**
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* ttm_tt_create
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*
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* @bo: pointer to a struct ttm_buffer_object
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* @zero_alloc: true if allocated pages needs to be zeroed
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*
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* Make sure we have a TTM structure allocated for the given BO.
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* No pages are actually allocated.
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*/
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int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc);
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/**
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* ttm_tt_init
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*
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* @ttm: The struct ttm_tt.
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* @bo: The buffer object we create the ttm for.
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* @page_flags: Page flags as identified by TTM_TT_FLAG_XX flags.
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* @caching: the desired caching state of the pages
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* @extra_pages: Extra pages needed for the driver.
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*
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* Create a struct ttm_tt to back data with system memory pages.
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* No pages are actually allocated.
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* Returns:
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* NULL: Out of memory.
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*/
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int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
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uint32_t page_flags, enum ttm_caching caching,
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unsigned long extra_pages);
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int ttm_sg_tt_init(struct ttm_tt *ttm_dma, struct ttm_buffer_object *bo,
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uint32_t page_flags, enum ttm_caching caching);
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/**
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* ttm_tt_fini
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*
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* @ttm: the ttm_tt structure.
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*
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* Free memory of ttm_tt structure
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*/
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void ttm_tt_fini(struct ttm_tt *ttm);
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/**
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* ttm_tt_destroy:
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*
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* @bdev: the ttm_device this object belongs to
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* @ttm: The struct ttm_tt.
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*
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* Unbind, unpopulate and destroy common struct ttm_tt.
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*/
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void ttm_tt_destroy(struct ttm_device *bdev, struct ttm_tt *ttm);
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/**
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* ttm_tt_swapin:
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*
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* @ttm: The struct ttm_tt.
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*
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* Swap in a previously swap out ttm_tt.
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*/
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int ttm_tt_swapin(struct ttm_tt *ttm);
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int ttm_tt_swapout(struct ttm_device *bdev, struct ttm_tt *ttm,
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gfp_t gfp_flags);
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/**
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* ttm_tt_populate - allocate pages for a ttm
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*
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* @bdev: the ttm_device this object belongs to
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* @ttm: Pointer to the ttm_tt structure
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* @ctx: operation context for populating the tt object.
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*
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* Calls the driver method to allocate pages for a ttm
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*/
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int ttm_tt_populate(struct ttm_device *bdev, struct ttm_tt *ttm,
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struct ttm_operation_ctx *ctx);
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/**
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* ttm_tt_unpopulate - free pages from a ttm
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*
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* @bdev: the ttm_device this object belongs to
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* @ttm: Pointer to the ttm_tt structure
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*
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* Calls the driver method to free all pages from a ttm
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*/
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void ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm);
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/**
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* ttm_tt_mark_for_clear - Mark pages for clearing on populate.
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*
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* @ttm: Pointer to the ttm_tt structure
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*
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* Marks pages for clearing so that the next time the page vector is
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* populated, the pages will be cleared.
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*/
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static inline void ttm_tt_mark_for_clear(struct ttm_tt *ttm)
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{
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ttm->page_flags |= TTM_TT_FLAG_ZERO_ALLOC;
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}
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void ttm_tt_mgr_init(unsigned long num_pages, unsigned long num_dma32_pages);
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struct ttm_kmap_iter *ttm_kmap_iter_tt_init(struct ttm_kmap_iter_tt *iter_tt,
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struct ttm_tt *tt);
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unsigned long ttm_tt_pages_limit(void);
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#if IS_ENABLED(CONFIG_AGP)
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#include <linux/agp_backend.h>
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/**
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* ttm_agp_tt_create
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*
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* @bo: Buffer object we allocate the ttm for.
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* @bridge: The agp bridge this device is sitting on.
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* @page_flags: Page flags as identified by TTM_TT_FLAG_XX flags.
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*
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*
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* Create a TTM backend that uses the indicated AGP bridge as an aperture
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* for TT memory. This function uses the linux agpgart interface to
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* bind and unbind memory backing a ttm_tt.
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*/
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struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo,
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struct agp_bridge_data *bridge,
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uint32_t page_flags);
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int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_resource *bo_mem);
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void ttm_agp_unbind(struct ttm_tt *ttm);
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void ttm_agp_destroy(struct ttm_tt *ttm);
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bool ttm_agp_is_bound(struct ttm_tt *ttm);
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#endif
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#endif
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