433 lines
10 KiB
C
433 lines
10 KiB
C
/* SPDX-License-Identifier: GPL-2.0 OR MIT */
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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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#define pr_fmt(fmt) "[TTM] " fmt
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#include <linux/sched.h>
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#include <linux/pagemap.h>
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#include <linux/shmem_fs.h>
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#include <linux/file.h>
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#include <drm/drm_cache.h>
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#include <drm/ttm/ttm_bo_driver.h>
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#include "ttm_module.h"
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static struct shrinker mm_shrinker;
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static atomic_long_t swapable_pages;
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/*
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* Allocates a ttm structure for the given BO.
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*/
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int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
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{
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struct ttm_device *bdev = bo->bdev;
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uint32_t page_flags = 0;
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dma_resv_assert_held(bo->base.resv);
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if (bo->ttm)
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return 0;
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switch (bo->type) {
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case ttm_bo_type_device:
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if (zero_alloc)
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page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
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break;
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case ttm_bo_type_kernel:
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break;
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case ttm_bo_type_sg:
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page_flags |= TTM_PAGE_FLAG_SG;
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break;
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default:
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pr_err("Illegal buffer object type\n");
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return -EINVAL;
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}
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bo->ttm = bdev->funcs->ttm_tt_create(bo, page_flags);
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if (unlikely(bo->ttm == NULL))
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return -ENOMEM;
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return 0;
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}
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/*
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* Allocates storage for pointers to the pages that back the ttm.
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*/
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static int ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
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{
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ttm->pages = kvmalloc_array(ttm->num_pages, sizeof(void*),
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GFP_KERNEL | __GFP_ZERO);
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if (!ttm->pages)
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return -ENOMEM;
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return 0;
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}
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static int ttm_dma_tt_alloc_page_directory(struct ttm_tt *ttm)
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{
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ttm->pages = kvmalloc_array(ttm->num_pages,
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sizeof(*ttm->pages) +
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sizeof(*ttm->dma_address),
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GFP_KERNEL | __GFP_ZERO);
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if (!ttm->pages)
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return -ENOMEM;
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ttm->dma_address = (void *)(ttm->pages + ttm->num_pages);
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return 0;
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}
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static int ttm_sg_tt_alloc_page_directory(struct ttm_tt *ttm)
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{
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ttm->dma_address = kvmalloc_array(ttm->num_pages,
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sizeof(*ttm->dma_address),
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GFP_KERNEL | __GFP_ZERO);
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if (!ttm->dma_address)
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return -ENOMEM;
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return 0;
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}
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void ttm_tt_destroy_common(struct ttm_device *bdev, struct ttm_tt *ttm)
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{
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ttm_tt_unpopulate(bdev, ttm);
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if (ttm->swap_storage)
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fput(ttm->swap_storage);
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ttm->swap_storage = NULL;
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}
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EXPORT_SYMBOL(ttm_tt_destroy_common);
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void ttm_tt_destroy(struct ttm_device *bdev, struct ttm_tt *ttm)
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{
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bdev->funcs->ttm_tt_destroy(bdev, ttm);
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}
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static void ttm_tt_init_fields(struct ttm_tt *ttm,
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struct ttm_buffer_object *bo,
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uint32_t page_flags,
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enum ttm_caching caching)
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{
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ttm->num_pages = PAGE_ALIGN(bo->base.size) >> PAGE_SHIFT;
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ttm->caching = ttm_cached;
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ttm->page_flags = page_flags;
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ttm->dma_address = NULL;
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ttm->swap_storage = NULL;
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ttm->sg = bo->sg;
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ttm->caching = caching;
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}
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int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
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uint32_t page_flags, enum ttm_caching caching)
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{
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ttm_tt_init_fields(ttm, bo, page_flags, caching);
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if (ttm_tt_alloc_page_directory(ttm)) {
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pr_err("Failed allocating page table\n");
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return -ENOMEM;
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}
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return 0;
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}
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EXPORT_SYMBOL(ttm_tt_init);
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void ttm_tt_fini(struct ttm_tt *ttm)
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{
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if (ttm->pages)
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kvfree(ttm->pages);
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else
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kvfree(ttm->dma_address);
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ttm->pages = NULL;
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ttm->dma_address = NULL;
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}
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EXPORT_SYMBOL(ttm_tt_fini);
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int ttm_sg_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
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uint32_t page_flags, enum ttm_caching caching)
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{
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int ret;
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ttm_tt_init_fields(ttm, bo, page_flags, caching);
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if (page_flags & TTM_PAGE_FLAG_SG)
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ret = ttm_sg_tt_alloc_page_directory(ttm);
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else
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ret = ttm_dma_tt_alloc_page_directory(ttm);
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if (ret) {
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pr_err("Failed allocating page table\n");
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return -ENOMEM;
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}
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return 0;
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}
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EXPORT_SYMBOL(ttm_sg_tt_init);
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int ttm_tt_swapin(struct ttm_tt *ttm)
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{
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struct address_space *swap_space;
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struct file *swap_storage;
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struct page *from_page;
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struct page *to_page;
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gfp_t gfp_mask;
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int i, ret;
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swap_storage = ttm->swap_storage;
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BUG_ON(swap_storage == NULL);
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swap_space = swap_storage->f_mapping;
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gfp_mask = mapping_gfp_mask(swap_space);
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for (i = 0; i < ttm->num_pages; ++i) {
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from_page = shmem_read_mapping_page_gfp(swap_space, i,
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gfp_mask);
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if (IS_ERR(from_page)) {
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ret = PTR_ERR(from_page);
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goto out_err;
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}
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to_page = ttm->pages[i];
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if (unlikely(to_page == NULL)) {
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ret = -ENOMEM;
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goto out_err;
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}
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copy_highpage(to_page, from_page);
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put_page(from_page);
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}
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fput(swap_storage);
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ttm->swap_storage = NULL;
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ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
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return 0;
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out_err:
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return ret;
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}
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/**
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* ttm_tt_swapout - swap out tt object
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*
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* @bdev: TTM device structure.
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* @ttm: The struct ttm_tt.
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* @gfp_flags: Flags to use for memory allocation.
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*
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* Swapout a TT object to a shmem_file, return number of pages swapped out or
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* negative error code.
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*/
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int ttm_tt_swapout(struct ttm_device *bdev, struct ttm_tt *ttm,
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gfp_t gfp_flags)
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{
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loff_t size = (loff_t)ttm->num_pages << PAGE_SHIFT;
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struct address_space *swap_space;
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struct file *swap_storage;
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struct page *from_page;
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struct page *to_page;
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int i, ret;
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swap_storage = shmem_file_setup("ttm swap", size, 0);
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if (IS_ERR(swap_storage)) {
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pr_err("Failed allocating swap storage\n");
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return PTR_ERR(swap_storage);
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}
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swap_space = swap_storage->f_mapping;
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gfp_flags &= mapping_gfp_mask(swap_space);
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for (i = 0; i < ttm->num_pages; ++i) {
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from_page = ttm->pages[i];
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if (unlikely(from_page == NULL))
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continue;
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to_page = shmem_read_mapping_page_gfp(swap_space, i, gfp_flags);
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if (IS_ERR(to_page)) {
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ret = PTR_ERR(to_page);
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goto out_err;
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}
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copy_highpage(to_page, from_page);
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set_page_dirty(to_page);
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mark_page_accessed(to_page);
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put_page(to_page);
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}
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ttm_tt_unpopulate(bdev, ttm);
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ttm->swap_storage = swap_storage;
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ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
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return ttm->num_pages;
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out_err:
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fput(swap_storage);
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return ret;
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}
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static void ttm_tt_add_mapping(struct ttm_device *bdev, struct ttm_tt *ttm)
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{
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pgoff_t i;
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if (ttm->page_flags & TTM_PAGE_FLAG_SG)
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return;
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for (i = 0; i < ttm->num_pages; ++i)
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ttm->pages[i]->mapping = bdev->dev_mapping;
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atomic_long_add(ttm->num_pages, &swapable_pages);
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}
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int ttm_tt_populate(struct ttm_device *bdev,
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struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
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{
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int ret;
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if (!ttm)
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return -EINVAL;
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if (ttm_tt_is_populated(ttm))
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return 0;
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if (bdev->funcs->ttm_tt_populate)
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ret = bdev->funcs->ttm_tt_populate(bdev, ttm, ctx);
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else
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ret = ttm_pool_alloc(&bdev->pool, ttm, ctx);
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if (ret)
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return ret;
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ttm_tt_add_mapping(bdev, ttm);
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ttm->page_flags |= TTM_PAGE_FLAG_PRIV_POPULATED;
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if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
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ret = ttm_tt_swapin(ttm);
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if (unlikely(ret != 0)) {
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ttm_tt_unpopulate(bdev, ttm);
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return ret;
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}
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}
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return 0;
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}
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EXPORT_SYMBOL(ttm_tt_populate);
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static void ttm_tt_clear_mapping(struct ttm_tt *ttm)
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{
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pgoff_t i;
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struct page **page = ttm->pages;
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if (ttm->page_flags & TTM_PAGE_FLAG_SG)
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return;
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for (i = 0; i < ttm->num_pages; ++i) {
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(*page)->mapping = NULL;
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(*page++)->index = 0;
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}
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atomic_long_sub(ttm->num_pages, &swapable_pages);
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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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if (!ttm_tt_is_populated(ttm))
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return;
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ttm_tt_clear_mapping(ttm);
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if (bdev->funcs->ttm_tt_unpopulate)
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bdev->funcs->ttm_tt_unpopulate(bdev, ttm);
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else
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ttm_pool_free(&bdev->pool, ttm);
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ttm->page_flags &= ~TTM_PAGE_FLAG_PRIV_POPULATED;
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}
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/* As long as pages are available make sure to release at least one */
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static unsigned long ttm_tt_shrinker_scan(struct shrinker *shrink,
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struct shrink_control *sc)
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{
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struct ttm_operation_ctx ctx = {
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.no_wait_gpu = false
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};
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int ret;
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ret = ttm_bo_swapout(&ctx, GFP_NOFS);
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return ret < 0 ? SHRINK_EMPTY : ret;
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}
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/* Return the number of pages available or SHRINK_EMPTY if we have none */
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static unsigned long ttm_tt_shrinker_count(struct shrinker *shrink,
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struct shrink_control *sc)
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{
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unsigned long num_pages;
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num_pages = atomic_long_read(&swapable_pages);
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return num_pages ? num_pages : SHRINK_EMPTY;
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}
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#ifdef CONFIG_DEBUG_FS
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/* Test the shrinker functions and dump the result */
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static int ttm_tt_debugfs_shrink_show(struct seq_file *m, void *data)
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{
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struct shrink_control sc = { .gfp_mask = GFP_KERNEL };
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fs_reclaim_acquire(GFP_KERNEL);
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seq_printf(m, "%lu/%lu\n", ttm_tt_shrinker_count(&mm_shrinker, &sc),
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ttm_tt_shrinker_scan(&mm_shrinker, &sc));
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fs_reclaim_release(GFP_KERNEL);
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(ttm_tt_debugfs_shrink);
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#endif
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/**
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* ttm_tt_mgr_init - register with the MM shrinker
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*
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* Register with the MM shrinker for swapping out BOs.
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*/
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int ttm_tt_mgr_init(void)
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{
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#ifdef CONFIG_DEBUG_FS
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debugfs_create_file("tt_shrink", 0400, ttm_debugfs_root, NULL,
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&ttm_tt_debugfs_shrink_fops);
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#endif
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mm_shrinker.count_objects = ttm_tt_shrinker_count;
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mm_shrinker.scan_objects = ttm_tt_shrinker_scan;
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mm_shrinker.seeks = 1;
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return register_shrinker(&mm_shrinker);
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}
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/**
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* ttm_tt_mgr_fini - unregister our MM shrinker
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*
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* Unregisters the MM shrinker.
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*/
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void ttm_tt_mgr_fini(void)
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{
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unregister_shrinker(&mm_shrinker);
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}
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