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1/*2 * Copyright 2014 Advanced Micro Devices, Inc.3 * All Rights Reserved.4 *5 * Permission is hereby granted, free of charge, to any person obtaining a6 * copy of this software and associated documentation files (the7 * "Software"), to deal in the Software without restriction, including8 * without limitation the rights to use, copy, modify, merge, publish,9 * distribute, sub license, and/or sell copies of the Software, and to10 * permit persons to whom the Software is furnished to do so, subject to11 * the following conditions:12 *13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,15 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL16 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,17 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR18 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE19 * USE OR OTHER DEALINGS IN THE SOFTWARE.20 *21 * The above copyright notice and this permission notice (including the22 * next paragraph) shall be included in all copies or substantial portions23 * of the Software.24 *25 */26/*27 * Authors:28 * Christian König <christian.koenig@amd.com>29 */30 31#include <linux/firmware.h>32#include <linux/module.h>33#include <linux/mmu_notifier.h>34 35#include <drm/drm.h>36 37#include "radeon.h"38 39/**40 * radeon_mn_invalidate - callback to notify about mm change41 *42 * @mn: our notifier43 * @range: the VMA under invalidation44 * @cur_seq: Value to pass to mmu_interval_set_seq()45 *46 * We block for all BOs between start and end to be idle and47 * unmap them by move them into system domain again.48 */49static bool radeon_mn_invalidate(struct mmu_interval_notifier *mn,50 const struct mmu_notifier_range *range,51 unsigned long cur_seq)52{53 struct radeon_bo *bo = container_of(mn, struct radeon_bo, notifier);54 struct ttm_operation_ctx ctx = { false, false };55 long r;56 57 if (!bo->tbo.ttm || !radeon_ttm_tt_is_bound(bo->tbo.bdev, bo->tbo.ttm))58 return true;59 60 if (!mmu_notifier_range_blockable(range))61 return false;62 63 r = radeon_bo_reserve(bo, true);64 if (r) {65 DRM_ERROR("(%ld) failed to reserve user bo\n", r);66 return true;67 }68 69 r = dma_resv_wait_timeout(bo->tbo.base.resv, DMA_RESV_USAGE_BOOKKEEP,70 false, MAX_SCHEDULE_TIMEOUT);71 if (r <= 0)72 DRM_ERROR("(%ld) failed to wait for user bo\n", r);73 74 radeon_ttm_placement_from_domain(bo, RADEON_GEM_DOMAIN_CPU);75 r = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);76 if (r)77 DRM_ERROR("(%ld) failed to validate user bo\n", r);78 79 radeon_bo_unreserve(bo);80 return true;81}82 83static const struct mmu_interval_notifier_ops radeon_mn_ops = {84 .invalidate = radeon_mn_invalidate,85};86 87/**88 * radeon_mn_register - register a BO for notifier updates89 *90 * @bo: radeon buffer object91 * @addr: userptr addr we should monitor92 *93 * Registers an MMU notifier for the given BO at the specified address.94 * Returns 0 on success, -ERRNO if anything goes wrong.95 */96int radeon_mn_register(struct radeon_bo *bo, unsigned long addr)97{98 int ret;99 100 ret = mmu_interval_notifier_insert(&bo->notifier, current->mm, addr,101 radeon_bo_size(bo), &radeon_mn_ops);102 if (ret)103 return ret;104 105 /*106 * FIXME: radeon appears to allow get_user_pages to run during107 * invalidate_range_start/end, which is not a safe way to read the108 * PTEs. It should use the mmu_interval_read_begin() scheme around the109 * get_user_pages to ensure that the PTEs are read properly110 */111 mmu_interval_read_begin(&bo->notifier);112 return 0;113}114 115/**116 * radeon_mn_unregister - unregister a BO for notifier updates117 *118 * @bo: radeon buffer object119 *120 * Remove any registration of MMU notifier updates from the buffer object.121 */122void radeon_mn_unregister(struct radeon_bo *bo)123{124 if (!bo->notifier.mm)125 return;126 mmu_interval_notifier_remove(&bo->notifier);127 bo->notifier.mm = NULL;128}129