342 lines
8.2 KiB
C
342 lines
8.2 KiB
C
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/*
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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/drmP.h>
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#include <drm/drm.h>
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#include "radeon.h"
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struct radeon_mn {
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/* constant after initialisation */
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struct radeon_device *rdev;
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struct mm_struct *mm;
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struct mmu_notifier mn;
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/* only used on destruction */
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struct work_struct work;
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/* protected by rdev->mn_lock */
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struct hlist_node node;
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/* objects protected by lock */
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struct mutex lock;
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struct rb_root_cached objects;
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};
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struct radeon_mn_node {
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struct interval_tree_node it;
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struct list_head bos;
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};
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/**
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* radeon_mn_destroy - destroy the rmn
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*
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* @work: previously sheduled work item
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*
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* Lazy destroys the notifier from a work item
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*/
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static void radeon_mn_destroy(struct work_struct *work)
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{
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struct radeon_mn *rmn = container_of(work, struct radeon_mn, work);
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struct radeon_device *rdev = rmn->rdev;
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struct radeon_mn_node *node, *next_node;
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struct radeon_bo *bo, *next_bo;
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mutex_lock(&rdev->mn_lock);
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mutex_lock(&rmn->lock);
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hash_del(&rmn->node);
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rbtree_postorder_for_each_entry_safe(node, next_node,
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&rmn->objects.rb_root, it.rb) {
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interval_tree_remove(&node->it, &rmn->objects);
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list_for_each_entry_safe(bo, next_bo, &node->bos, mn_list) {
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bo->mn = NULL;
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list_del_init(&bo->mn_list);
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}
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kfree(node);
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}
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mutex_unlock(&rmn->lock);
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mutex_unlock(&rdev->mn_lock);
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mmu_notifier_unregister(&rmn->mn, rmn->mm);
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kfree(rmn);
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}
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/**
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* radeon_mn_release - callback to notify about mm destruction
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*
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* @mn: our notifier
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* @mn: the mm this callback is about
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*
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* Shedule a work item to lazy destroy our notifier.
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*/
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static void radeon_mn_release(struct mmu_notifier *mn,
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struct mm_struct *mm)
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{
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struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn);
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INIT_WORK(&rmn->work, radeon_mn_destroy);
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schedule_work(&rmn->work);
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}
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/**
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* radeon_mn_invalidate_range_start - callback to notify about mm change
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*
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* @mn: our notifier
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* @mn: the mm this callback is about
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* @start: start of updated range
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* @end: end of updated range
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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 int radeon_mn_invalidate_range_start(struct mmu_notifier *mn,
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struct mm_struct *mm,
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unsigned long start,
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unsigned long end,
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bool blockable)
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{
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struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn);
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struct ttm_operation_ctx ctx = { false, false };
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struct interval_tree_node *it;
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int ret = 0;
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/* notification is exclusive, but interval is inclusive */
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end -= 1;
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/* TODO we should be able to split locking for interval tree and
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* the tear down.
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*/
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if (blockable)
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mutex_lock(&rmn->lock);
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else if (!mutex_trylock(&rmn->lock))
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return -EAGAIN;
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it = interval_tree_iter_first(&rmn->objects, start, end);
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while (it) {
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struct radeon_mn_node *node;
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struct radeon_bo *bo;
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long r;
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if (!blockable) {
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ret = -EAGAIN;
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goto out_unlock;
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}
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node = container_of(it, struct radeon_mn_node, it);
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it = interval_tree_iter_next(it, start, end);
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list_for_each_entry(bo, &node->bos, mn_list) {
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if (!bo->tbo.ttm || bo->tbo.ttm->state != tt_bound)
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continue;
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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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continue;
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}
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r = reservation_object_wait_timeout_rcu(bo->tbo.resv,
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true, false, 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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}
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}
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out_unlock:
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mutex_unlock(&rmn->lock);
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return ret;
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}
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static const struct mmu_notifier_ops radeon_mn_ops = {
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.release = radeon_mn_release,
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.invalidate_range_start = radeon_mn_invalidate_range_start,
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};
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/**
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* radeon_mn_get - create notifier context
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*
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* @rdev: radeon device pointer
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*
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* Creates a notifier context for current->mm.
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*/
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static struct radeon_mn *radeon_mn_get(struct radeon_device *rdev)
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{
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struct mm_struct *mm = current->mm;
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struct radeon_mn *rmn;
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int r;
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if (down_write_killable(&mm->mmap_sem))
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return ERR_PTR(-EINTR);
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mutex_lock(&rdev->mn_lock);
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hash_for_each_possible(rdev->mn_hash, rmn, node, (unsigned long)mm)
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if (rmn->mm == mm)
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goto release_locks;
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rmn = kzalloc(sizeof(*rmn), GFP_KERNEL);
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if (!rmn) {
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rmn = ERR_PTR(-ENOMEM);
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goto release_locks;
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}
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rmn->rdev = rdev;
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rmn->mm = mm;
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rmn->mn.ops = &radeon_mn_ops;
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mutex_init(&rmn->lock);
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rmn->objects = RB_ROOT_CACHED;
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r = __mmu_notifier_register(&rmn->mn, mm);
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if (r)
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goto free_rmn;
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hash_add(rdev->mn_hash, &rmn->node, (unsigned long)mm);
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release_locks:
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mutex_unlock(&rdev->mn_lock);
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up_write(&mm->mmap_sem);
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return rmn;
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free_rmn:
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mutex_unlock(&rdev->mn_lock);
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up_write(&mm->mmap_sem);
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kfree(rmn);
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return ERR_PTR(r);
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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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unsigned long end = addr + radeon_bo_size(bo) - 1;
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struct radeon_device *rdev = bo->rdev;
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struct radeon_mn *rmn;
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struct radeon_mn_node *node = NULL;
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struct list_head bos;
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struct interval_tree_node *it;
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rmn = radeon_mn_get(rdev);
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if (IS_ERR(rmn))
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return PTR_ERR(rmn);
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INIT_LIST_HEAD(&bos);
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mutex_lock(&rmn->lock);
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while ((it = interval_tree_iter_first(&rmn->objects, addr, end))) {
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kfree(node);
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node = container_of(it, struct radeon_mn_node, it);
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interval_tree_remove(&node->it, &rmn->objects);
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addr = min(it->start, addr);
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end = max(it->last, end);
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list_splice(&node->bos, &bos);
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}
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if (!node) {
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node = kmalloc(sizeof(struct radeon_mn_node), GFP_KERNEL);
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if (!node) {
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mutex_unlock(&rmn->lock);
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return -ENOMEM;
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}
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}
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bo->mn = rmn;
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node->it.start = addr;
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node->it.last = end;
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INIT_LIST_HEAD(&node->bos);
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list_splice(&bos, &node->bos);
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list_add(&bo->mn_list, &node->bos);
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interval_tree_insert(&node->it, &rmn->objects);
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mutex_unlock(&rmn->lock);
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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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struct radeon_device *rdev = bo->rdev;
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struct radeon_mn *rmn;
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struct list_head *head;
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mutex_lock(&rdev->mn_lock);
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rmn = bo->mn;
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if (rmn == NULL) {
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mutex_unlock(&rdev->mn_lock);
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return;
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}
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mutex_lock(&rmn->lock);
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/* save the next list entry for later */
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head = bo->mn_list.next;
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bo->mn = NULL;
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list_del(&bo->mn_list);
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if (list_empty(head)) {
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struct radeon_mn_node *node;
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node = container_of(head, struct radeon_mn_node, bos);
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interval_tree_remove(&node->it, &rmn->objects);
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kfree(node);
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}
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mutex_unlock(&rmn->lock);
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mutex_unlock(&rdev->mn_lock);
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}
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