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* 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/drm.h>
#include "radeon.h"
struct radeon_mn {
struct mmu_notifier mn;
/* objects protected by lock */
struct mutex lock;
struct rb_root_cached objects;
};
struct radeon_mn_node {
struct interval_tree_node it;
struct list_head bos;
};
/**
* 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 int radeon_mn_invalidate_range_start(struct mmu_notifier *mn,
const struct mmu_notifier_range *range)
{
struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn);
struct ttm_operation_ctx ctx = { false, false };
struct interval_tree_node *it;
unsigned long end;
int ret = 0;
/* notification is exclusive, but interval is inclusive */
end = range->end - 1;
/* TODO we should be able to split locking for interval tree and
* the tear down.
*/
if (mmu_notifier_range_blockable(range))
mutex_lock(&rmn->lock);
else if (!mutex_trylock(&rmn->lock))
return -EAGAIN;
it = interval_tree_iter_first(&rmn->objects, range->start, end);
while (it) {
struct radeon_mn_node *node;
struct radeon_bo *bo;
long r;
if (!mmu_notifier_range_blockable(range)) {
ret = -EAGAIN;
goto out_unlock;
}
node = container_of(it, struct radeon_mn_node, it);
it = interval_tree_iter_next(it, range->start, end);
list_for_each_entry(bo, &node->bos, mn_list) {
if (!bo->tbo.ttm || bo->tbo.ttm->state != tt_bound)
continue;
r = radeon_bo_reserve(bo, true);
if (r) {
DRM_ERROR("(%ld) failed to reserve user bo\n", r);
continue;
}
r = dma_resv_wait_timeout_rcu(bo->tbo.base.resv,
true, false, MAX_SCHEDULE_TIMEOUT);
if (r <= 0)
DRM_ERROR("(%ld) 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, &ctx);
if (r)
DRM_ERROR("(%ld) failed to validate user bo\n", r);
radeon_bo_unreserve(bo);
}
}
out_unlock:
mutex_unlock(&rmn->lock);
return ret;
}
static void radeon_mn_release(struct mmu_notifier *mn, struct mm_struct *mm)
{
struct mmu_notifier_range range = {
.mm = mm,
.start = 0,
.end = ULONG_MAX,
.flags = 0,
.event = MMU_NOTIFY_UNMAP,
};
radeon_mn_invalidate_range_start(mn, &range);
}
static struct mmu_notifier *radeon_mn_alloc_notifier(struct mm_struct *mm)
{
struct radeon_mn *rmn;
rmn = kzalloc(sizeof(*rmn), GFP_KERNEL);
if (!rmn)
return ERR_PTR(-ENOMEM);
mutex_init(&rmn->lock);
rmn->objects = RB_ROOT_CACHED;
return &rmn->mn;
}
static void radeon_mn_free_notifier(struct mmu_notifier *mn)
{
kfree(container_of(mn, struct radeon_mn, mn));
}
static const struct mmu_notifier_ops radeon_mn_ops = {
.release = radeon_mn_release,
.invalidate_range_start = radeon_mn_invalidate_range_start,
.alloc_notifier = radeon_mn_alloc_notifier,
.free_notifier = radeon_mn_free_notifier,
};
/**
* 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 mmu_notifier *mn;
struct radeon_mn *rmn;
struct radeon_mn_node *node = NULL;
struct list_head bos;
struct interval_tree_node *it;
mn = mmu_notifier_get(&radeon_mn_ops, current->mm);
if (IS_ERR(mn))
return PTR_ERR(mn);
rmn = container_of(mn, struct radeon_mn, mn);
INIT_LIST_HEAD(&bos);
mutex_lock(&rmn->lock);
while ((it = interval_tree_iter_first(&rmn->objects, addr, end))) {
kfree(node);
node = container_of(it, struct radeon_mn_node, it);
interval_tree_remove(&node->it, &rmn->objects);
addr = min(it->start, addr);
end = max(it->last, end);
list_splice(&node->bos, &bos);
}
if (!node) {
node = kmalloc(sizeof(struct radeon_mn_node), GFP_KERNEL);
if (!node) {
mutex_unlock(&rmn->lock);
return -ENOMEM;
}
}
bo->mn = rmn;
node->it.start = addr;
node->it.last = end;
INIT_LIST_HEAD(&node->bos);
list_splice(&bos, &node->bos);
list_add(&bo->mn_list, &node->bos);
interval_tree_insert(&node->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_mn *rmn = bo->mn;
struct list_head *head;
if (!rmn)
return;
mutex_lock(&rmn->lock);
/* save the next list entry for later */
head = bo->mn_list.next;
list_del(&bo->mn_list);
if (list_empty(head)) {
struct radeon_mn_node *node;
node = container_of(head, struct radeon_mn_node, bos);
interval_tree_remove(&node->it, &rmn->objects);
kfree(node);
}
mutex_unlock(&rmn->lock);
mmu_notifier_put(&rmn->mn);
bo->mn = NULL;
}
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