336 lines
10 KiB
C
336 lines
10 KiB
C
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/**************************************************************************
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*
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* Copyright (c) 2006-2009 Vmware, Inc., Palo Alto, CA., USA
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* All Rights Reserved.
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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
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* 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 NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/*
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* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
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*/
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#ifndef _TTM_BO_DRIVER_H_
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#define _TTM_BO_DRIVER_H_
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#include <drm/drm_mm.h>
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#include <drm/drm_vma_manager.h>
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#include <linux/workqueue.h>
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#include <linux/fs.h>
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#include <linux/spinlock.h>
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#include <linux/dma-resv.h>
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#include <drm/ttm/ttm_device.h>
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#include "ttm_bo_api.h"
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#include "ttm_kmap_iter.h"
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#include "ttm_placement.h"
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#include "ttm_tt.h"
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#include "ttm_pool.h"
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/**
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* struct ttm_lru_bulk_move_pos
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*
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* @first: first BO in the bulk move range
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* @last: last BO in the bulk move range
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*
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* Positions for a lru bulk move.
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*/
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struct ttm_lru_bulk_move_pos {
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struct ttm_buffer_object *first;
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struct ttm_buffer_object *last;
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};
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/**
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* struct ttm_lru_bulk_move
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*
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* @tt: first/last lru entry for BOs in the TT domain
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* @vram: first/last lru entry for BOs in the VRAM domain
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* @swap: first/last lru entry for BOs on the swap list
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*
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* Helper structure for bulk moves on the LRU list.
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*/
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struct ttm_lru_bulk_move {
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struct ttm_lru_bulk_move_pos tt[TTM_MAX_BO_PRIORITY];
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struct ttm_lru_bulk_move_pos vram[TTM_MAX_BO_PRIORITY];
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};
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/*
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* ttm_bo.c
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*/
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/**
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* ttm_bo_mem_space
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*
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* @bo: Pointer to a struct ttm_buffer_object. the data of which
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* we want to allocate space for.
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* @proposed_placement: Proposed new placement for the buffer object.
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* @mem: A struct ttm_resource.
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* @interruptible: Sleep interruptible when sliping.
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* @no_wait_gpu: Return immediately if the GPU is busy.
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*
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* Allocate memory space for the buffer object pointed to by @bo, using
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* the placement flags in @mem, potentially evicting other idle buffer objects.
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* This function may sleep while waiting for space to become available.
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* Returns:
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* -EBUSY: No space available (only if no_wait == 1).
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* -ENOMEM: Could not allocate memory for the buffer object, either due to
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* fragmentation or concurrent allocators.
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* -ERESTARTSYS: An interruptible sleep was interrupted by a signal.
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*/
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int ttm_bo_mem_space(struct ttm_buffer_object *bo,
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struct ttm_placement *placement,
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struct ttm_resource **mem,
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struct ttm_operation_ctx *ctx);
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/**
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* ttm_bo_unmap_virtual
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*
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* @bo: tear down the virtual mappings for this BO
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*/
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void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo);
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/**
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* ttm_bo_reserve:
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*
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* @bo: A pointer to a struct ttm_buffer_object.
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* @interruptible: Sleep interruptible if waiting.
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* @no_wait: Don't sleep while trying to reserve, rather return -EBUSY.
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* @ticket: ticket used to acquire the ww_mutex.
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*
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* Locks a buffer object for validation. (Or prevents other processes from
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* locking it for validation), while taking a number of measures to prevent
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* deadlocks.
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*
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* Returns:
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* -EDEADLK: The reservation may cause a deadlock.
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* Release all buffer reservations, wait for @bo to become unreserved and
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* try again.
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* -ERESTARTSYS: A wait for the buffer to become unreserved was interrupted by
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* a signal. Release all buffer reservations and return to user-space.
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* -EBUSY: The function needed to sleep, but @no_wait was true
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* -EALREADY: Bo already reserved using @ticket. This error code will only
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* be returned if @use_ticket is set to true.
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*/
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static inline int ttm_bo_reserve(struct ttm_buffer_object *bo,
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bool interruptible, bool no_wait,
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struct ww_acquire_ctx *ticket)
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{
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int ret = 0;
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if (no_wait) {
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bool success;
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if (WARN_ON(ticket))
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return -EBUSY;
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success = dma_resv_trylock(bo->base.resv);
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return success ? 0 : -EBUSY;
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}
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if (interruptible)
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ret = dma_resv_lock_interruptible(bo->base.resv, ticket);
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else
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ret = dma_resv_lock(bo->base.resv, ticket);
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if (ret == -EINTR)
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return -ERESTARTSYS;
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return ret;
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}
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/**
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* ttm_bo_reserve_slowpath:
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* @bo: A pointer to a struct ttm_buffer_object.
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* @interruptible: Sleep interruptible if waiting.
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* @sequence: Set (@bo)->sequence to this value after lock
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*
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* This is called after ttm_bo_reserve returns -EAGAIN and we backed off
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* from all our other reservations. Because there are no other reservations
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* held by us, this function cannot deadlock any more.
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*/
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static inline int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
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bool interruptible,
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struct ww_acquire_ctx *ticket)
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{
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if (interruptible) {
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int ret = dma_resv_lock_slow_interruptible(bo->base.resv,
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ticket);
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if (ret == -EINTR)
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ret = -ERESTARTSYS;
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return ret;
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}
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dma_resv_lock_slow(bo->base.resv, ticket);
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return 0;
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}
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static inline void
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ttm_bo_move_to_lru_tail_unlocked(struct ttm_buffer_object *bo)
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{
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spin_lock(&bo->bdev->lru_lock);
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ttm_bo_move_to_lru_tail(bo, bo->resource, NULL);
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spin_unlock(&bo->bdev->lru_lock);
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}
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static inline void ttm_bo_assign_mem(struct ttm_buffer_object *bo,
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struct ttm_resource *new_mem)
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{
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WARN_ON(bo->resource);
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bo->resource = new_mem;
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}
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/**
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* ttm_bo_move_null = assign memory for a buffer object.
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* @bo: The bo to assign the memory to
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* @new_mem: The memory to be assigned.
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*
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* Assign the memory from new_mem to the memory of the buffer object bo.
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*/
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static inline void ttm_bo_move_null(struct ttm_buffer_object *bo,
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struct ttm_resource *new_mem)
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{
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ttm_resource_free(bo, &bo->resource);
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ttm_bo_assign_mem(bo, new_mem);
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}
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/**
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* ttm_bo_unreserve
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*
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* @bo: A pointer to a struct ttm_buffer_object.
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*
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* Unreserve a previous reservation of @bo.
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*/
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static inline void ttm_bo_unreserve(struct ttm_buffer_object *bo)
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{
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ttm_bo_move_to_lru_tail_unlocked(bo);
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dma_resv_unlock(bo->base.resv);
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}
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/*
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* ttm_bo_util.c
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*/
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int ttm_mem_io_reserve(struct ttm_device *bdev,
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struct ttm_resource *mem);
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void ttm_mem_io_free(struct ttm_device *bdev,
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struct ttm_resource *mem);
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/**
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* ttm_bo_move_memcpy
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*
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* @bo: A pointer to a struct ttm_buffer_object.
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* @interruptible: Sleep interruptible if waiting.
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* @no_wait_gpu: Return immediately if the GPU is busy.
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* @new_mem: struct ttm_resource indicating where to move.
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*
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* Fallback move function for a mappable buffer object in mappable memory.
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* The function will, if successful,
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* free any old aperture space, and set (@new_mem)->mm_node to NULL,
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* and update the (@bo)->mem placement flags. If unsuccessful, the old
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* data remains untouched, and it's up to the caller to free the
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* memory space indicated by @new_mem.
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* Returns:
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* !0: Failure.
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*/
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int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
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struct ttm_operation_ctx *ctx,
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struct ttm_resource *new_mem);
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/**
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* ttm_bo_move_accel_cleanup.
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*
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* @bo: A pointer to a struct ttm_buffer_object.
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* @fence: A fence object that signals when moving is complete.
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* @evict: This is an evict move. Don't return until the buffer is idle.
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* @pipeline: evictions are to be pipelined.
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* @new_mem: struct ttm_resource indicating where to move.
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*
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* Accelerated move function to be called when an accelerated move
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* has been scheduled. The function will create a new temporary buffer object
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* representing the old placement, and put the sync object on both buffer
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* objects. After that the newly created buffer object is unref'd to be
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* destroyed when the move is complete. This will help pipeline
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* buffer moves.
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*/
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int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
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struct dma_fence *fence, bool evict,
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bool pipeline,
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struct ttm_resource *new_mem);
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/**
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* ttm_bo_move_accel_cleanup.
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*
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* @bo: A pointer to a struct ttm_buffer_object.
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* @new_mem: struct ttm_resource indicating where to move.
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*
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* Special case of ttm_bo_move_accel_cleanup where the bo is guaranteed
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* by the caller to be idle. Typically used after memcpy buffer moves.
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*/
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static inline void ttm_bo_move_sync_cleanup(struct ttm_buffer_object *bo,
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struct ttm_resource *new_mem)
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{
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int ret = ttm_bo_move_accel_cleanup(bo, NULL, true, false, new_mem);
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WARN_ON(ret);
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}
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/**
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* ttm_bo_pipeline_gutting.
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*
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* @bo: A pointer to a struct ttm_buffer_object.
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*
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* Pipelined gutting a BO of its backing store.
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*/
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int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo);
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/**
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* ttm_io_prot
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*
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* bo: ttm buffer object
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* res: ttm resource object
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* @tmp: Page protection flag for a normal, cached mapping.
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*
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* Utility function that returns the pgprot_t that should be used for
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* setting up a PTE with the caching model indicated by @c_state.
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*/
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pgprot_t ttm_io_prot(struct ttm_buffer_object *bo, struct ttm_resource *res,
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pgprot_t tmp);
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/**
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* ttm_bo_tt_bind
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*
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* Bind the object tt to a memory resource.
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*/
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int ttm_bo_tt_bind(struct ttm_buffer_object *bo, struct ttm_resource *mem);
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/**
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* ttm_bo_tt_destroy.
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*/
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void ttm_bo_tt_destroy(struct ttm_buffer_object *bo);
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void ttm_move_memcpy(bool clear,
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u32 num_pages,
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struct ttm_kmap_iter *dst_iter,
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struct ttm_kmap_iter *src_iter);
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struct ttm_kmap_iter *
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ttm_kmap_iter_iomap_init(struct ttm_kmap_iter_iomap *iter_io,
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struct io_mapping *iomap,
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struct sg_table *st,
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resource_size_t start);
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#endif
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