/*
* Copyright 2014 Advanced Micro Devices, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
*/
/*
* Authors:
* Christian König <christian.koenig@amd.com>
*/
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/mmu_notifier.h>
#include <drm/drmP.h>
#include <drm/drm.h>
#include "radeon.h"
struct radeon_mn {
/* constant after initialisation */
struct radeon_device *rdev;
struct mm_struct *mm;
struct mmu_notifier mn;
/* only used on destruction */
struct work_struct work;
/* protected by rdev->mn_lock */
struct hlist_node node;
/* objects protected by lock */
struct mutex lock;
struct rb_root objects;
};
/**
* radeon_mn_destroy - destroy the rmn
*
* @work: previously sheduled work item
*
* Lazy destroys the notifier from a work item
*/
static void radeon_mn_destroy(struct work_struct *work)
{
struct radeon_mn *rmn = container_of(work, struct radeon_mn, work);
struct radeon_device *rdev = rmn->rdev;
struct radeon_bo *bo, *next;
mutex_lock(&rdev->mn_lock);
mutex_lock(&rmn->lock);
hash_del(&rmn->node);
rbtree_postorder_for_each_entry_safe(bo, next, &rmn->objects, mn_it.rb) {
interval_tree_remove(&bo->mn_it, &rmn->objects);
bo->mn = NULL;
}
mutex_unlock(&rmn->lock);
mutex_unlock(&rdev->mn_lock);
mmu_notifier_unregister(&rmn->mn, rmn->mm);
kfree(rmn);
}
/**
* radeon_mn_release - callback to notify about mm destruction
*
* @mn: our notifier
* @mn: the mm this callback is about
*
* Shedule a work item to lazy destroy our notifier.
*/
static void radeon_mn_release(struct mmu_notifier *mn,
struct mm_struct *mm)
{
struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn);
INIT_WORK(&rmn->work, radeon_mn_destroy);
schedule_work(&rmn->work);
}
/**
* radeon_mn_invalidate_range_start - callback to notify about mm change
*
* @mn: our notifier
* @mn: the mm this callback is about
* @start: start of updated range
* @end: end of updated range
*
* We block for all BOs between start and end to be idle and
* unmap them by move them into system domain again.
*/
static void radeon_mn_invalidate_range_start(struct mmu_notifier *mn,
struct mm_struct *mm,
unsigned long start,
unsigned long end)
{
struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn);
struct interval_tree_node *it;
/* notification is exclusive, but interval is inclusive */
end -= 1;
mutex_lock(&rmn->lock);
it = interval_tree_iter_first(&rmn->objects, start, end);
while (it) {
struct radeon_bo *bo;
struct fence *fence;
int r;
bo = container_of(it, struct radeon_bo, mn_it);
it = interval_tree_iter_next(it, start, end);
r = radeon_bo_reserve(bo, true);
if (r) {
DRM_ERROR("(%d) failed to reserve user bo\n", r);
continue;
}
fence = reservation_object_get_excl(bo->tbo.resv);
if (fence) {
r = radeon_fence_wait((struct radeon_fence *)fence, false);
if (r)
DRM_ERROR("(%d) failed to wait for user bo\n", r);
}
radeon_ttm_placement_from_domain(bo, RADEON_GEM_DOMAIN_CPU);
r = ttm_bo_validate(&bo->tbo, &bo->placement, false, false);
if (r)
DRM_ERROR("(%d) failed to validate user bo\n", r);
radeon_bo_unreserve(bo);
}
mutex_unlock(&rmn->lock);
}
static const struct mmu_notifier_ops radeon_mn_ops = {
.release = radeon_mn_release,
.invalidate_range_start = radeon_mn_invalidate_range_start,
};
/**
* radeon_mn_get - create notifier context
*
* @rdev: radeon device pointer
*
* Creates a notifier context for current->mm.
*/
static struct radeon_mn *radeon_mn_get(struct radeon_device *rdev)
{
struct mm_struct *mm = current->mm;
struct radeon_mn *rmn;
int r;
down_write(&mm->mmap_sem);
mutex_lock(&rdev->mn_lock);
hash_for_each_possible(rdev->mn_hash, rmn, node, (unsigned long)mm)
if (rmn->mm == mm)
goto release_locks;
rmn = kzalloc(sizeof(*rmn), GFP_KERNEL);
if (!rmn) {
rmn = ERR_PTR(-ENOMEM);
goto release_locks;
}
rmn->rdev = rdev;
rmn->mm = mm;
rmn->mn.ops = &radeon_mn_ops;
mutex_init(&rmn->lock);
rmn->objects = RB_ROOT;
r = __mmu_notifier_register(&rmn->mn, mm);
if (r)
goto free_rmn;
hash_add(rdev->mn_hash, &rmn->node, (unsigned long)mm);
release_locks:
mutex_unlock(&rdev->mn_lock);
up_write(&mm->mmap_sem);
return rmn;
free_rmn:
mutex_unlock(&rdev->mn_lock);
up_write(&mm->mmap_sem);
kfree(rmn);
return ERR_PTR(r);
}
/**
* radeon_mn_register - register a BO for notifier updates
*
* @bo: radeon buffer object
* @addr: userptr addr we should monitor
*
* Registers an MMU notifier for the given BO at the specified address.
* Returns 0 on success, -ERRNO if anything goes wrong.
*/
int radeon_mn_register(struct radeon_bo *bo, unsigned long addr)
{
unsigned long end = addr + radeon_bo_size(bo) - 1;
struct radeon_device *rdev = bo->rdev;
struct radeon_mn *rmn;
struct interval_tree_node *it;
rmn = radeon_mn_get(rdev);
if (IS_ERR(rmn))
return PTR_ERR(rmn);
mutex_lock(&rmn->lock);
it = interval_tree_iter_first(&rmn->objects, addr, end);
if (it) {
mutex_unlock(&rmn->lock);
return -EEXIST;
}
bo->mn = rmn;
bo->mn_it.start = addr;
bo->mn_it.last = end;
interval_tree_insert(&bo->mn_it, &rmn->objects);
mutex_unlock(&rmn->lock);
return 0;
}
/**
* radeon_mn_unregister - unregister a BO for notifier updates
*
* @bo: radeon buffer object
*
* Remove any registration of MMU notifier updates from the buffer object.
*/
void radeon_mn_unregister(struct radeon_bo *bo)
{
struct radeon_device *rdev = bo->rdev;
struct radeon_mn *rmn;
mutex_lock(&rdev->mn_lock);
rmn = bo->mn;
if (rmn == NULL) {
mutex_unlock(&rdev->mn_lock);
return;
}
mutex_lock(&rmn->lock);
interval_tree_remove(&bo->mn_it, &rmn->objects);
bo->mn = NULL;
mutex_unlock(&rmn->lock);
mutex_unlock(&rdev->mn_lock);
}
