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/*
* Copyright 2020 Advanced Micro Devices, Inc.
*
* 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, sublicense,
* 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 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 NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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: Christian König
*/
#ifndef _TTM_DEVICE_H_
#define _TTM_DEVICE_H_
#include <linux/types.h>
#include <linux/workqueue.h>
#include <drm/ttm/ttm_resource.h>
#include <drm/ttm/ttm_pool.h>
struct ttm_device;
struct ttm_placement;
struct ttm_buffer_object;
struct ttm_operation_ctx;
/**
* struct ttm_global - Buffer object driver global data.
*/
extern struct ttm_global {
/**
* @dummy_read_page: Pointer to a dummy page used for mapping requests
* of unpopulated pages. Constant after init.
*/
struct page *dummy_read_page;
/**
* @device_list: List of buffer object devices. Protected by
* ttm_global_mutex.
*/
struct list_head device_list;
/**
* @bo_count: Number of buffer objects allocated by devices.
*/
atomic_t bo_count;
} ttm_glob;
struct ttm_device_funcs {
/**
* ttm_tt_create
*
* @bo: The buffer object to create the ttm for.
* @page_flags: Page flags as identified by TTM_TT_FLAG_XX flags.
*
* Create a struct ttm_tt to back data with system memory pages.
* No pages are actually allocated.
* Returns:
* NULL: Out of memory.
*/
struct ttm_tt *(*ttm_tt_create)(struct ttm_buffer_object *bo,
uint32_t page_flags);
/**
* ttm_tt_populate
*
* @ttm: The struct ttm_tt to contain the backing pages.
*
* Allocate all backing pages
* Returns:
* -ENOMEM: Out of memory.
*/
int (*ttm_tt_populate)(struct ttm_device *bdev,
struct ttm_tt *ttm,
struct ttm_operation_ctx *ctx);
/**
* ttm_tt_unpopulate
*
* @ttm: The struct ttm_tt to contain the backing pages.
*
* Free all backing page
*/
void (*ttm_tt_unpopulate)(struct ttm_device *bdev,
struct ttm_tt *ttm);
/**
* ttm_tt_destroy
*
* @bdev: Pointer to a ttm device
* @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 (*ttm_tt_destroy)(struct ttm_device *bdev, struct ttm_tt *ttm);
/**
* struct ttm_bo_driver member eviction_valuable
*
* @bo: the buffer object to be evicted
* @place: placement we need room for
*
* Check with the driver if it is valuable to evict a BO to make room
* for a certain placement.
*/
bool (*eviction_valuable)(struct ttm_buffer_object *bo,
const struct ttm_place *place);
/**
* struct ttm_bo_driver member evict_flags:
*
* @bo: the buffer object to be evicted
*
* Return the bo flags for a buffer which is not mapped to the hardware.
* These will be placed in proposed_flags so that when the move is
* finished, they'll end up in bo->mem.flags
* This should not cause multihop evictions, and the core will warn
* if one is proposed.
*/
void (*evict_flags)(struct ttm_buffer_object *bo,
struct ttm_placement *placement);
/**
* struct ttm_bo_driver member move:
*
* @bo: the buffer to move
* @evict: whether this motion is evicting the buffer from
* the graphics address space
* @ctx: context for this move with parameters
* @new_mem: the new memory region receiving the buffer
* @hop: placement for driver directed intermediate hop
*
* Move a buffer between two memory regions.
* Returns errno -EMULTIHOP if driver requests a hop
*/
int (*move)(struct ttm_buffer_object *bo, bool evict,
struct ttm_operation_ctx *ctx,
struct ttm_resource *new_mem,
struct ttm_place *hop);
/**
* Hook to notify driver about a resource delete.
*/
void (*delete_mem_notify)(struct ttm_buffer_object *bo);
/**
* notify the driver that we're about to swap out this bo
*/
void (*swap_notify)(struct ttm_buffer_object *bo);
/**
* Driver callback on when mapping io memory (for bo_move_memcpy
* for instance). TTM will take care to call io_mem_free whenever
* the mapping is not use anymore. io_mem_reserve & io_mem_free
* are balanced.
*/
int (*io_mem_reserve)(struct ttm_device *bdev,
struct ttm_resource *mem);
void (*io_mem_free)(struct ttm_device *bdev,
struct ttm_resource *mem);
/**
* Return the pfn for a given page_offset inside the BO.
*
* @bo: the BO to look up the pfn for
* @page_offset: the offset to look up
*/
unsigned long (*io_mem_pfn)(struct ttm_buffer_object *bo,
unsigned long page_offset);
/**
* Read/write memory buffers for ptrace access
*
* @bo: the BO to access
* @offset: the offset from the start of the BO
* @buf: pointer to source/destination buffer
* @len: number of bytes to copy
* @write: whether to read (0) from or write (non-0) to BO
*
* If successful, this function should return the number of
* bytes copied, -EIO otherwise. If the number of bytes
* returned is < len, the function may be called again with
* the remainder of the buffer to copy.
*/
int (*access_memory)(struct ttm_buffer_object *bo, unsigned long offset,
void *buf, int len, int write);
/**
* Notify the driver that we're about to release a BO
*
* @bo: BO that is about to be released
*
* Gives the driver a chance to do any cleanup, including
* adding fences that may force a delayed delete
*/
void (*release_notify)(struct ttm_buffer_object *bo);
};
/**
* struct ttm_device - Buffer object driver device-specific data.
*/
struct ttm_device {
/**
* @device_list: Our entry in the global device list.
* Constant after bo device init
*/
struct list_head device_list;
/**
* @funcs: Function table for the device.
* Constant after bo device init
*/
const struct ttm_device_funcs *funcs;
/**
* @sysman: Resource manager for the system domain.
* Access via ttm_manager_type.
*/
struct ttm_resource_manager sysman;
/**
* @man_drv: An array of resource_managers, one per resource type.
*/
struct ttm_resource_manager *man_drv[TTM_NUM_MEM_TYPES];
/**
* @vma_manager: Address space manager for finding BOs to mmap.
*/
struct drm_vma_offset_manager *vma_manager;
/**
* @pool: page pool for the device.
*/
struct ttm_pool pool;
/**
* @lru_lock: Protection for the per manager LRU and ddestroy lists.
*/
spinlock_t lru_lock;
/**
* @pinned: Buffer objects which are pinned and so not on any LRU list.
*/
struct list_head pinned;
/**
* @dev_mapping: A pointer to the struct address_space for invalidating
* CPU mappings on buffer move. Protected by load/unload sync.
*/
struct address_space *dev_mapping;
/**
* @wq: Work queue structure for the delayed delete workqueue.
*/
struct workqueue_struct *wq;
};
int ttm_global_swapout(struct ttm_operation_ctx *ctx, gfp_t gfp_flags);
int ttm_device_swapout(struct ttm_device *bdev, struct ttm_operation_ctx *ctx,
gfp_t gfp_flags);
static inline struct ttm_resource_manager *
ttm_manager_type(struct ttm_device *bdev, int mem_type)
{
BUILD_BUG_ON(__builtin_constant_p(mem_type)
&& mem_type >= TTM_NUM_MEM_TYPES);
return bdev->man_drv[mem_type];
}
static inline void ttm_set_driver_manager(struct ttm_device *bdev, int type,
struct ttm_resource_manager *manager)
{
BUILD_BUG_ON(__builtin_constant_p(type) && type >= TTM_NUM_MEM_TYPES);
bdev->man_drv[type] = manager;
}
int ttm_device_init(struct ttm_device *bdev, const struct ttm_device_funcs *funcs,
struct device *dev, struct address_space *mapping,
struct drm_vma_offset_manager *vma_manager,
bool use_dma_alloc, bool use_dma32);
void ttm_device_fini(struct ttm_device *bdev);
void ttm_device_clear_dma_mappings(struct ttm_device *bdev);
#endif