ttm_tt.h | Explore in Territory

/**************************************************************************
 *
 * Copyright (c) 2006-2009 Vmware, Inc., Palo Alto, CA., USA
 * All Rights Reserved.
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 * The above copyright notice and this permission notice (including the
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#ifndef _TTM_TT_H_
#define _TTM_TT_H_

#include <linux/pagemap.h>
#include <linux/types.h>
#include <drm/ttm/ttm_caching.h>
#include <drm/ttm/ttm_kmap_iter.h>

struct ttm_device;
struct ttm_tt;
struct ttm_resource;
struct ttm_buffer_object;
struct ttm_operation_ctx;

/**
 * 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 { … };

/**
 * struct ttm_kmap_iter_tt - Specialization of a mappig iterator for a tt.
 * @base: Embedded struct ttm_kmap_iter providing the usage interface
 * @tt: Cached struct ttm_tt.
 * @prot: Cached page protection for mapping.
 */
struct ttm_kmap_iter_tt { … };

static inline bool ttm_tt_is_populated(struct ttm_tt *tt)
{ … }

/**
 * ttm_tt_create
 *
 * @bo: pointer to a struct ttm_buffer_object
 * @zero_alloc: true if allocated pages needs to be zeroed
 *
 * Make sure we have a TTM structure allocated for the given BO.
 * No pages are actually allocated.
 */
int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc);

/**
 * ttm_tt_init
 *
 * @ttm: The struct ttm_tt.
 * @bo: The buffer object we create the ttm for.
 * @page_flags: Page flags as identified by TTM_TT_FLAG_XX flags.
 * @caching: the desired caching state of the pages
 * @extra_pages: Extra pages needed for the driver.
 *
 * Create a struct ttm_tt to back data with system memory pages.
 * No pages are actually allocated.
 * Returns:
 * NULL: Out of memory.
 */
int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
		uint32_t page_flags, enum ttm_caching caching,
		unsigned long extra_pages);
int ttm_sg_tt_init(struct ttm_tt *ttm_dma, struct ttm_buffer_object *bo,
		   uint32_t page_flags, enum ttm_caching caching);

/**
 * ttm_tt_fini
 *
 * @ttm: the ttm_tt structure.
 *
 * Free memory of ttm_tt structure
 */
void ttm_tt_fini(struct ttm_tt *ttm);

/**
 * ttm_tt_destroy:
 *
 * @bdev: the ttm_device this object belongs to
 * @ttm: The struct ttm_tt.
 *
 * Unbind, unpopulate and destroy common struct ttm_tt.
 */
void ttm_tt_destroy(struct ttm_device *bdev, struct ttm_tt *ttm);

/**
 * ttm_tt_swapin:
 *
 * @ttm: The struct ttm_tt.
 *
 * Swap in a previously swap out ttm_tt.
 */
int ttm_tt_swapin(struct ttm_tt *ttm);
int ttm_tt_swapout(struct ttm_device *bdev, struct ttm_tt *ttm,
		   gfp_t gfp_flags);

/**
 * ttm_tt_populate - allocate pages for a ttm
 *
 * @bdev: the ttm_device this object belongs to
 * @ttm: Pointer to the ttm_tt structure
 * @ctx: operation context for populating the tt object.
 *
 * Calls the driver method to allocate pages for a ttm
 */
int ttm_tt_populate(struct ttm_device *bdev, struct ttm_tt *ttm,
		    struct ttm_operation_ctx *ctx);

/**
 * ttm_tt_unpopulate - free pages from a ttm
 *
 * @bdev: the ttm_device this object belongs to
 * @ttm: Pointer to the ttm_tt structure
 *
 * Calls the driver method to free all pages from a ttm
 */
void ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm);

/**
 * ttm_tt_mark_for_clear - Mark pages for clearing on populate.
 *
 * @ttm: Pointer to the ttm_tt structure
 *
 * Marks pages for clearing so that the next time the page vector is
 * populated, the pages will be cleared.
 */
static inline void ttm_tt_mark_for_clear(struct ttm_tt *ttm)
{ … }

void ttm_tt_mgr_init(unsigned long num_pages, unsigned long num_dma32_pages);

struct ttm_kmap_iter *ttm_kmap_iter_tt_init(struct ttm_kmap_iter_tt *iter_tt,
					    struct ttm_tt *tt);
unsigned long ttm_tt_pages_limit(void);
#if IS_ENABLED(CONFIG_AGP)
#include <linux/agp_backend.h>

/**
 * ttm_agp_tt_create
 *
 * @bo: Buffer object we allocate the ttm for.
 * @bridge: The agp bridge this device is sitting on.
 * @page_flags: Page flags as identified by TTM_TT_FLAG_XX flags.
 *
 *
 * Create a TTM backend that uses the indicated AGP bridge as an aperture
 * for TT memory. This function uses the linux agpgart interface to
 * bind and unbind memory backing a ttm_tt.
 */
struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo,
				 struct agp_bridge_data *bridge,
				 uint32_t page_flags);
int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_resource *bo_mem);
void ttm_agp_unbind(struct ttm_tt *ttm);
void ttm_agp_destroy(struct ttm_tt *ttm);
bool ttm_agp_is_bound(struct ttm_tt *ttm);
#endif

#endif
linux/include/drm/ttm/ttm_tt.h
