/**************************************************************************
*
* Copyright (c) 2006-2009 Vmware, Inc., Palo Alto, CA., USA
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
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* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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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 {
/** @pages: Array of pages backing the data. */
struct page **pages;
/**
* @page_flags: The page flags.
*
* Supported values:
*
* TTM_TT_FLAG_SWAPPED: Set by TTM when the pages have been unpopulated
* and swapped out by TTM. Calling ttm_tt_populate() will then swap the
* pages back in, and unset the flag. Drivers should in general never
* need to touch this.
*
* TTM_TT_FLAG_ZERO_ALLOC: Set if the pages will be zeroed on
* allocation.
*
* TTM_TT_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_TT_FLAG_EXTERNAL_MAPPABLE: Same behaviour as
* TTM_TT_FLAG_EXTERNAL, but with the reduced restriction that it is
* still valid to use TTM to map the pages directly. This is useful when
* implementing a ttm_tt backend which still allocates driver owned
* pages underneath(say with shmem).
*
* Note that since this also implies TTM_TT_FLAG_EXTERNAL, the usage
* here should always be:
*
* page_flags = TTM_TT_FLAG_EXTERNAL |
* TTM_TT_FLAG_EXTERNAL_MAPPABLE;
*
* TTM_TT_FLAG_DECRYPTED: The mapped ttm pages should be marked as
* not encrypted. The framework will try to match what the dma layer
* is doing, but note that it is a little fragile because ttm page
* fault handling abuses the DMA api a bit and dma_map_attrs can't be
* used to assure pgprot always matches.
*
* TTM_TT_FLAG_PRIV_POPULATED: TTM internal only. DO NOT USE. This is
* set by TTM after ttm_tt_populate() has successfully returned, and is
* then unset when TTM calls ttm_tt_unpopulate().
*/
#define TTM_TT_FLAG_SWAPPED BIT(0)
#define TTM_TT_FLAG_ZERO_ALLOC BIT(1)
#define TTM_TT_FLAG_EXTERNAL BIT(2)
#define TTM_TT_FLAG_EXTERNAL_MAPPABLE BIT(3)
#define TTM_TT_FLAG_DECRYPTED BIT(4)
#define TTM_TT_FLAG_PRIV_POPULATED BIT(5)
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;
};
/**
* 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 {
struct ttm_kmap_iter base;
struct ttm_tt *tt;
pgprot_t prot;
};
static inline bool ttm_tt_is_populated(struct ttm_tt *tt)
{
return tt->page_flags & TTM_TT_FLAG_PRIV_POPULATED;
}
/**
* 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)
{
ttm->page_flags |= TTM_TT_FLAG_ZERO_ALLOC;
}
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
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