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