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/**************************************************************************
*
* 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
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* 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
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/*
* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
*/
#ifndef _TTM_BO_DRIVER_H_
#define _TTM_BO_DRIVER_H_
#include <ttm/ttm_bo_api.h>
#include <ttm/ttm_memory.h>
#include <ttm/ttm_module.h>
#include <drm/drm_mm.h>
#include <drm/drm_global.h>
#include <linux/workqueue.h>
#include <linux/fs.h>
#include <linux/spinlock.h>
struct ttm_backend_func {
/**
* struct ttm_backend_func member bind
*
* @ttm: Pointer to a struct ttm_tt.
* @bo_mem: Pointer to a struct ttm_mem_reg describing the
* memory type and location for binding.
*
* Bind the backend pages into the aperture in the location
* indicated by @bo_mem. This function should be able to handle
* differences between aperture and system page sizes.
*/
int (*bind) (struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem);
/**
* struct ttm_backend_func member unbind
*
* @ttm: Pointer to a struct ttm_tt.
*
* Unbind previously bound backend pages. This function should be
* able to handle differences between aperture and system page sizes.
*/
int (*unbind) (struct ttm_tt *ttm);
/**
* struct ttm_backend_func member destroy
*
* @ttm: Pointer to a struct ttm_tt.
*
* Destroy the backend. This will be call back from ttm_tt_destroy so
* don't call ttm_tt_destroy from the callback or infinite loop.
*/
void (*destroy) (struct ttm_tt *ttm);
};
#define TTM_PAGE_FLAG_WRITE (1 << 3)
#define TTM_PAGE_FLAG_SWAPPED (1 << 4)
#define TTM_PAGE_FLAG_PERSISTENT_SWAP (1 << 5)
#define TTM_PAGE_FLAG_ZERO_ALLOC (1 << 6)
#define TTM_PAGE_FLAG_DMA32 (1 << 7)
#define TTM_PAGE_FLAG_SG (1 << 8)
enum ttm_caching_state {
tt_uncached,
tt_wc,
tt_cached
};
/**
* struct ttm_tt
*
* @bdev: Pointer to a struct ttm_bo_device.
* @func: Pointer to a struct ttm_backend_func that describes
* the backend methods.
* @dummy_read_page: Page to map where the ttm_tt page array contains a NULL
* pointer.
* @pages: Array of pages backing the data.
* @num_pages: Number of pages in the page array.
* @bdev: Pointer to the current struct ttm_bo_device.
* @be: Pointer to the ttm backend.
* @swap_storage: Pointer to shmem struct file for swap storage.
* @caching_state: The current caching state of the pages.
* @state: The current binding state of the pages.
*
* 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_bo_device *bdev;
struct ttm_backend_func *func;
struct page *dummy_read_page;
struct page **pages;
uint32_t page_flags;
unsigned long num_pages;
struct sg_table *sg; /* for SG objects via dma-buf */
struct ttm_bo_global *glob;
struct file *swap_storage;
enum ttm_caching_state caching_state;
enum {
tt_bound,
tt_unbound,
tt_unpopulated,
} state;
};
/**
* struct ttm_dma_tt
*
* @ttm: Base ttm_tt struct.
* @dma_address: The DMA (bus) addresses of the pages
* @pages_list: used by some page allocation backend
*
* 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_dma_tt {
struct ttm_tt ttm;
dma_addr_t *dma_address;
struct list_head pages_list;
};
#define TTM_MEMTYPE_FLAG_FIXED (1 << 0) /* Fixed (on-card) PCI memory */
#define TTM_MEMTYPE_FLAG_MAPPABLE (1 << 1) /* Memory mappable */
#define TTM_MEMTYPE_FLAG_CMA (1 << 3) /* Can't map aperture */
struct ttm_mem_type_manager;
struct ttm_mem_type_manager_func {
/**
* struct ttm_mem_type_manager member init
*
* @man: Pointer to a memory type manager.
* @p_size: Implementation dependent, but typically the size of the
* range to be managed in pages.
*
* Called to initialize a private range manager. The function is
* expected to initialize the man::priv member.
* Returns 0 on success, negative error code on failure.
*/
int (*init)(struct ttm_mem_type_manager *man, unsigned long p_size);
/**
* struct ttm_mem_type_manager member takedown
*
* @man: Pointer to a memory type manager.
*
* Called to undo the setup done in init. All allocated resources
* should be freed.
*/
int (*takedown)(struct ttm_mem_type_manager *man);
/**
* struct ttm_mem_type_manager member get_node
*
* @man: Pointer to a memory type manager.
* @bo: Pointer to the buffer object we're allocating space for.
* @placement: Placement details.
* @mem: Pointer to a struct ttm_mem_reg to be filled in.
*
* This function should allocate space in the memory type managed
* by @man. Placement details if
* applicable are given by @placement. If successful,
* @mem::mm_node should be set to a non-null value, and
* @mem::start should be set to a value identifying the beginning
* of the range allocated, and the function should return zero.
* If the memory region accommodate the buffer object, @mem::mm_node
* should be set to NULL, and the function should return 0.
* If a system error occurred, preventing the request to be fulfilled,
* the function should return a negative error code.
*
* Note that @mem::mm_node will only be dereferenced by
* struct ttm_mem_type_manager functions and optionally by the driver,
* which has knowledge of the underlying type.
*
* This function may not be called from within atomic context, so
* an implementation can and must use either a mutex or a spinlock to
* protect any data structures managing the space.
*/
int (*get_node)(struct ttm_mem_type_manager *man,
struct ttm_buffer_object *bo,
struct ttm_placement *placement,
struct ttm_mem_reg *mem);
/**
* struct ttm_mem_type_manager member put_node
*
* @man: Pointer to a memory type manager.
* @mem: Pointer to a struct ttm_mem_reg to be filled in.
*
* This function frees memory type resources previously allocated
* and that are identified by @mem::mm_node and @mem::start. May not
* be called from within atomic context.
*/
void (*put_node)(struct ttm_mem_type_manager *man,
struct ttm_mem_reg *mem);
/**
* struct ttm_mem_type_manager member debug
*
* @man: Pointer to a memory type manager.
* @prefix: Prefix to be used in printout to identify the caller.
*
* This function is called to print out the state of the memory
* type manager to aid debugging of out-of-memory conditions.
* It may not be called from within atomic context.
*/
void (*debug)(struct ttm_mem_type_manager *man, const char *prefix);
};
/**
* struct ttm_mem_type_manager
*
* @has_type: The memory type has been initialized.
* @use_type: The memory type is enabled.
* @flags: TTM_MEMTYPE_XX flags identifying the traits of the memory
* managed by this memory type.
* @gpu_offset: If used, the GPU offset of the first managed page of
* fixed memory or the first managed location in an aperture.
* @size: Size of the managed region.
* @available_caching: A mask of available caching types, TTM_PL_FLAG_XX,
* as defined in ttm_placement_common.h
* @default_caching: The default caching policy used for a buffer object
* placed in this memory type if the user doesn't provide one.
* @func: structure pointer implementing the range manager. See above
* @priv: Driver private closure for @func.
* @io_reserve_mutex: Mutex optionally protecting shared io_reserve structures
* @use_io_reserve_lru: Use an lru list to try to unreserve io_mem_regions
* reserved by the TTM vm system.
* @io_reserve_lru: Optional lru list for unreserving io mem regions.
* @io_reserve_fastpath: Only use bdev::driver::io_mem_reserve to obtain
* static information. bdev::driver::io_mem_free is never used.
* @lru: The lru list for this memory type.
*
* This structure is used to identify and manage memory types for a device.
* It's set up by the ttm_bo_driver::init_mem_type method.
*/
struct ttm_mem_type_manager {
struct ttm_bo_device *bdev;
/*
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