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 a 6 * copy of this software and associated documentation files (the 7 * "Software"), to deal in the Software without restriction, including 8 * without limitation the rights to use, copy, modify, merge, publish, 9 * distribute, sub license, and/or sell copies of the Software, and to 10 * permit persons to whom the Software is furnished to do so, subject to 11 * the following conditions: 12 * 13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 15 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 16 * 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 OR 18 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 19 * USE OR OTHER DEALINGS IN THE SOFTWARE. 20 * 21 * The above copyright notice and this permission notice (including the 22 * next paragraph) shall be included in all copies or substantial portions 23 * 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 change 41 * 42 * @mn: our notifier 43 * @range: the VMA under invalidation 44 * @cur_seq: Value to pass to mmu_interval_set_seq() 45 * 46 * We block for all BOs between start and end to be idle and 47 * unmap them by move them into system domain again. 48 */ 49 static 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 83 static 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 updates 89 * 90 * @bo: radeon buffer object 91 * @addr: userptr addr we should monitor 92 * 93 * Registers an MMU notifier for the given BO at the specified address. 94 * Returns 0 on success, -ERRNO if anything goes wrong. 95 */ 96 int 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 during 107 * invalidate_range_start/end, which is not a safe way to read the 108 * PTEs. It should use the mmu_interval_read_begin() scheme around the 109 * get_user_pages to ensure that the PTEs are read properly 110 */ 111 mmu_interval_read_begin(&bo->notifier); 112 return 0; 113 } 114 115 /** 116 * radeon_mn_unregister - unregister a BO for notifier updates 117 * 118 * @bo: radeon buffer object 119 * 120 * Remove any registration of MMU notifier updates from the buffer object. 121 */ 122 void 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