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3506ff69c3
The new API is an exact match for the needs of radeon. For some reason radeon tries to remove overlapping ranges from the interval tree, but interval trees (and mmu_interval_notifier_insert()) support overlapping ranges directly. Simply delete all this code. Since this driver is missing a invalidate_range_end callback, but still calls get_user_pages(), it cannot be correct against all races. Link: https://lore.kernel.org/r/20191112202231.3856-8-jgg@ziepe.ca Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
127 lines
3.7 KiB
C
127 lines
3.7 KiB
C
/*
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* Copyright 2014 Advanced Micro Devices, Inc.
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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 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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* 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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*/
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/*
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* Authors:
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* Christian König <christian.koenig@amd.com>
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*/
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#include <linux/firmware.h>
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#include <linux/module.h>
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#include <linux/mmu_notifier.h>
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#include <drm/drm.h>
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#include "radeon.h"
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/**
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* radeon_mn_invalidate - callback to notify about mm change
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*
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* @mn: our notifier
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* @range: the VMA under invalidation
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*
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* We block for all BOs between start and end to be idle and
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* unmap them by move them into system domain again.
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*/
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static bool radeon_mn_invalidate(struct mmu_interval_notifier *mn,
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const struct mmu_notifier_range *range,
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unsigned long cur_seq)
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{
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struct radeon_bo *bo = container_of(mn, struct radeon_bo, notifier);
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struct ttm_operation_ctx ctx = { false, false };
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long r;
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if (!bo->tbo.ttm || bo->tbo.ttm->state != tt_bound)
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return true;
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if (!mmu_notifier_range_blockable(range))
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return false;
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r = radeon_bo_reserve(bo, true);
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if (r) {
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DRM_ERROR("(%ld) failed to reserve user bo\n", r);
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return true;
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}
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r = dma_resv_wait_timeout_rcu(bo->tbo.base.resv, true, false,
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MAX_SCHEDULE_TIMEOUT);
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if (r <= 0)
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DRM_ERROR("(%ld) failed to wait for user bo\n", r);
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radeon_ttm_placement_from_domain(bo, RADEON_GEM_DOMAIN_CPU);
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r = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
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if (r)
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DRM_ERROR("(%ld) failed to validate user bo\n", r);
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radeon_bo_unreserve(bo);
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return true;
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}
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static const struct mmu_interval_notifier_ops radeon_mn_ops = {
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.invalidate = radeon_mn_invalidate,
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};
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/**
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* radeon_mn_register - register a BO for notifier updates
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*
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* @bo: radeon buffer object
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* @addr: userptr addr we should monitor
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*
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* Registers an MMU notifier for the given BO at the specified address.
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* Returns 0 on success, -ERRNO if anything goes wrong.
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*/
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int radeon_mn_register(struct radeon_bo *bo, unsigned long addr)
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{
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int ret;
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ret = mmu_interval_notifier_insert(&bo->notifier, current->mm, addr,
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radeon_bo_size(bo), &radeon_mn_ops);
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if (ret)
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return ret;
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/*
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* FIXME: radeon appears to allow get_user_pages to run during
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* invalidate_range_start/end, which is not a safe way to read the
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* PTEs. It should use the mmu_interval_read_begin() scheme around the
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* get_user_pages to ensure that the PTEs are read properly
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*/
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mmu_interval_read_begin(&bo->notifier);
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return 0;
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}
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/**
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* radeon_mn_unregister - unregister a BO for notifier updates
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*
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* @bo: radeon buffer object
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*
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* Remove any registration of MMU notifier updates from the buffer object.
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*/
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void radeon_mn_unregister(struct radeon_bo *bo)
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{
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if (!bo->notifier.mm)
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return;
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mmu_interval_notifier_remove(&bo->notifier);
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bo->notifier.mm = NULL;
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}
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