Release 4.17 drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
/*
* 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 <linux/interval_tree.h>
#include <drm/drmP.h>
#include <drm/drm.h>
#include "amdgpu.h"
struct amdgpu_mn {
/* constant after initialisation */
struct amdgpu_device *adev;
struct mm_struct *mm;
struct mmu_notifier mn;
/* only used on destruction */
struct work_struct work;
/* protected by adev->mn_lock */
struct hlist_node node;
/* objects protected by lock */
struct rw_semaphore lock;
struct rb_root_cached objects;
struct mutex read_lock;
atomic_t recursion;
};
struct amdgpu_mn_node {
struct interval_tree_node it;
struct list_head bos;
};
/**
* amdgpu_mn_destroy - destroy the rmn
*
* @work: previously sheduled work item
*
* Lazy destroys the notifier from a work item
*/
static void amdgpu_mn_destroy(struct work_struct *work)
{
struct amdgpu_mn *rmn = container_of(work, struct amdgpu_mn, work);
struct amdgpu_device *adev = rmn->adev;
struct amdgpu_mn_node *node, *next_node;
struct amdgpu_bo *bo, *next_bo;
mutex_lock(&adev->mn_lock);
down_write(&rmn->lock);
hash_del(&rmn->node);
rbtree_postorder_for_each_entry_safe(node, next_node,
&rmn->objects.rb_root, it.rb) {
list_for_each_entry_safe(bo, next_bo, &node->bos, mn_list) {
bo->mn = NULL;
list_del_init(&bo->mn_list);
}
kfree(node);
}
up_write(&rmn->lock);
mutex_unlock(&adev->mn_lock);
mmu_notifier_unregister_no_release(&rmn->mn, rmn->mm);
kfree(rmn);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Deucher | 131 | 86.75% | 1 | 14.29% |
| Felix Kuehling | 13 | 8.61% | 2 | 28.57% |
| Christian König | 6 | 3.97% | 3 | 42.86% |
| Davidlohr Bueso A | 1 | 0.66% | 1 | 14.29% |
| Total | 151 | 100.00% | 7 | 100.00% |
/**
* amdgpu_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 amdgpu_mn_release(struct mmu_notifier *mn,
struct mm_struct *mm)
{
struct amdgpu_mn *rmn = container_of(mn, struct amdgpu_mn, mn);
INIT_WORK(&rmn->work, amdgpu_mn_destroy);
schedule_work(&rmn->work);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Deucher | 49 | 100.00% | 1 | 100.00% |
| Total | 49 | 100.00% | 1 | 100.00% |
/**
* amdgpu_mn_lock - take the write side lock for this mn
*/
void amdgpu_mn_lock(struct amdgpu_mn *mn)
{
if (mn)
down_write(&mn->lock);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Christian König | 22 | 100.00% | 1 | 100.00% |
| Total | 22 | 100.00% | 1 | 100.00% |
/**
* amdgpu_mn_unlock - drop the write side lock for this mn
*/
void amdgpu_mn_unlock(struct amdgpu_mn *mn)
{
if (mn)
up_write(&mn->lock);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Christian König | 22 | 100.00% | 1 | 100.00% |
| Total | 22 | 100.00% | 1 | 100.00% |
/**
* amdgpu_mn_read_lock - take the rmn read lock
*
* @rmn: our notifier
*
* Take the rmn read side lock.
*/
static void amdgpu_mn_read_lock(struct amdgpu_mn *rmn)
{
mutex_lock(&rmn->read_lock);
if (atomic_inc_return(&rmn->recursion) == 1)
down_read_non_owner(&rmn->lock);
mutex_unlock(&rmn->read_lock);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Christian König | 47 | 100.00% | 1 | 100.00% |
| Total | 47 | 100.00% | 1 | 100.00% |
/**
* amdgpu_mn_read_unlock - drop the rmn read lock
*
* @rmn: our notifier
*
* Drop the rmn read side lock.
*/
static void amdgpu_mn_read_unlock(struct amdgpu_mn *rmn)
{
if (atomic_dec_return(&rmn->recursion) == 0)
up_read_non_owner(&rmn->lock);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Christian König | 31 | 100.00% | 1 | 100.00% |
| Total | 31 | 100.00% | 1 | 100.00% |
/**
* amdgpu_mn_invalidate_node - unmap all BOs of a node
*
* @node: the node with the BOs to unmap
*
* We block for all BOs and unmap them by move them
* into system domain again.
*/
static void amdgpu_mn_invalidate_node(struct amdgpu_mn_node *node,
unsigned long start,
unsigned long end)
{
struct amdgpu_bo *bo;
long r;
list_for_each_entry(bo, &node->bos, mn_list) {
if (!amdgpu_ttm_tt_affect_userptr(bo->tbo.ttm, start, end))
continue;
r = reservation_object_wait_timeout_rcu(bo->tbo.resv,
true, false, MAX_SCHEDULE_TIMEOUT);
if (r <= 0)
DRM_ERROR("(%ld) failed to wait for user bo\n", r);
amdgpu_ttm_tt_mark_user_pages(bo->tbo.ttm);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Deucher | 66 | 70.97% | 1 | 16.67% |
| Christian König | 23 | 24.73% | 4 | 66.67% |
| Jack Xiao | 4 | 4.30% | 1 | 16.67% |
| Total | 93 | 100.00% | 6 | 100.00% |
/**
* amdgpu_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 amdgpu_mn_invalidate_range_start(struct mmu_notifier *mn,
struct mm_struct *mm,
unsigned long start,
unsigned long end)
{
struct amdgpu_mn *rmn = container_of(mn, struct amdgpu_mn, mn);
struct interval_tree_node *it;
/* notification is exclusive, but interval is inclusive */
end -= 1;
amdgpu_mn_read_lock(rmn);
it = interval_tree_iter_first(&rmn->objects, start, end);
while (it) {
struct amdgpu_mn_node *node;
node = container_of(it, struct amdgpu_mn_node, it);
it = interval_tree_iter_next(it, start, end);
amdgpu_mn_invalidate_node(node, start, end);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Christian König | 111 | 100.00% | 2 | 100.00% |
| Total | 111 | 100.00% | 2 | 100.00% |
/**
* amdgpu_mn_invalidate_range_end - 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
*
* Release the lock again to allow new command submissions.
*/
static void amdgpu_mn_invalidate_range_end(struct mmu_notifier *mn,
struct mm_struct *mm,
unsigned long start,
unsigned long end)
{
struct amdgpu_mn *rmn = container_of(mn, struct amdgpu_mn, mn);
amdgpu_mn_read_unlock(rmn);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Christian König | 43 | 97.73% | 2 | 66.67% |
| Alex Deucher | 1 | 2.27% | 1 | 33.33% |
| Total | 44 | 100.00% | 3 | 100.00% |
static const struct mmu_notifier_ops amdgpu_mn_ops = {
.release = amdgpu_mn_release,
.invalidate_range_start = amdgpu_mn_invalidate_range_start,
.invalidate_range_end = amdgpu_mn_invalidate_range_end,
};
/**
* amdgpu_mn_get - create notifier context
*
* @adev: amdgpu device pointer
*
* Creates a notifier context for current->mm.
*/
struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev)
{
struct mm_struct *mm = current->mm;
struct amdgpu_mn *rmn;
int r;
mutex_lock(&adev->mn_lock);
if (down_write_killable(&mm->mmap_sem)) {
mutex_unlock(&adev->mn_lock);
return ERR_PTR(-EINTR);
}
hash_for_each_possible(adev->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->adev = adev;
rmn->mm = mm;
rmn->mn.ops = &amdgpu_mn_ops;
init_rwsem(&rmn->lock);
rmn->objects = RB_ROOT_CACHED;
mutex_init(&rmn->read_lock);
atomic_set(&rmn->recursion, 0);
r = __mmu_notifier_register(&rmn->mn, mm);
if (r)
goto free_rmn;
hash_add(adev->mn_hash, &rmn->node, (unsigned long)mm);
release_locks:
up_write(&mm->mmap_sem);
mutex_unlock(&adev->mn_lock);
return rmn;
free_rmn:
up_write(&mm->mmap_sem);
mutex_unlock(&adev->mn_lock);
kfree(rmn);
return ERR_PTR(r);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Deucher | 192 | 75.00% | 1 | 14.29% |
| Christian König | 26 | 10.16% | 3 | 42.86% |
| Michal Hocko | 20 | 7.81% | 1 | 14.29% |
| Felix Kuehling | 17 | 6.64% | 1 | 14.29% |
| Davidlohr Bueso A | 1 | 0.39% | 1 | 14.29% |
| Total | 256 | 100.00% | 7 | 100.00% |
/**
* amdgpu_mn_register - register a BO for notifier updates
*
* @bo: amdgpu 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 amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
{
unsigned long end = addr + amdgpu_bo_size(bo) - 1;
struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
struct amdgpu_mn *rmn;
struct amdgpu_mn_node *node = NULL;
struct list_head bos;
struct interval_tree_node *it;
rmn = amdgpu_mn_get(adev);
if (IS_ERR(rmn))
return PTR_ERR(rmn);
INIT_LIST_HEAD(&bos);
down_write(&rmn->lock);
while ((it = interval_tree_iter_first(&rmn->objects, addr, end))) {
kfree(node);
node = container_of(it, struct amdgpu_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 amdgpu_mn_node), GFP_KERNEL);
if (!node) {
up_write(&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);
up_write(&rmn->lock);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Deucher | 284 | 95.95% | 1 | 25.00% |
| Christian König | 12 | 4.05% | 3 | 75.00% |
| Total | 296 | 100.00% | 4 | 100.00% |
/**
* amdgpu_mn_unregister - unregister a BO for notifier updates
*
* @bo: amdgpu buffer object
*
* Remove any registration of MMU notifier updates from the buffer object.
*/
void amdgpu_mn_unregister(struct amdgpu_bo *bo)
{
struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
struct amdgpu_mn *rmn;
struct list_head *head;
mutex_lock(&adev->mn_lock);
rmn = bo->mn;
if (rmn == NULL) {
mutex_unlock(&adev->mn_lock);
return;
}
down_write(&rmn->lock);
/* save the next list entry for later */
head = bo->mn_list.next;
bo->mn = NULL;
list_del_init(&bo->mn_list);
if (list_empty(head)) {
struct amdgpu_mn_node *node;
node = container_of(head, struct amdgpu_mn_node, bos);
interval_tree_remove(&node->it, &rmn->objects);
kfree(node);
}
up_write(&rmn->lock);
mutex_unlock(&adev->mn_lock);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Deucher | 110 | 70.51% | 1 | 14.29% |
| Felix Kuehling | 33 | 21.15% | 2 | 28.57% |
| Christian König | 13 | 8.33% | 4 | 57.14% |
| Total | 156 | 100.00% | 7 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Deucher | 922 | 66.09% | 1 | 5.56% |
| Christian König | 383 | 27.46% | 11 | 61.11% |
| Felix Kuehling | 63 | 4.52% | 3 | 16.67% |
| Michal Hocko | 20 | 1.43% | 1 | 5.56% |
| Jack Xiao | 4 | 0.29% | 1 | 5.56% |
| Davidlohr Bueso A | 3 | 0.22% | 1 | 5.56% |
| Total | 1395 | 100.00% | 18 | 100.00% |
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