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drm/xe: Update PT layer with better error handling

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Update PT layer so if a memory allocation for a PTE fails the error can
be propagated to the user without requiring the VM to be killed.

v5:
 - change return value invalidation_fence_init to void (Matthew Auld)
v7:
 - Invert i,j usage in two places (Matthew Auld)
 - s/0/NULL (Matthew Auld)
 - Don't ignore return value of xe_pt_new_shared (Matthew Auld)
 - Don't check for NULL in xe_pt_entry (Matthew Auld)

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240704041652.272920-7-matthew.brost@intel.com
This commit is contained in:
Matthew Brost 2024-07-03 21:16:51 -07:00
parent 282e6f846d
commit a708f6501c
1 changed files with 168 additions and 66 deletions
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234
drivers/gpu/drm/xe/xe_pt.c
View File

@ -846,19 +846,27 @@ xe_vm_populate_pgtable(struct xe_migrate_pt_update *pt_update, struct xe_tile *t
}
}
static void xe_pt_abort_bind(struct xe_vma *vma,
struct xe_vm_pgtable_update *entries,
u32 num_entries)
static void xe_pt_cancel_bind(struct xe_vma *vma,
struct xe_vm_pgtable_update *entries,
u32 num_entries)
{
u32 i, j;
for (i = 0; i < num_entries; i++) {
if (!entries[i].pt_entries)
struct xe_pt *pt = entries[i].pt;
if (!pt)
continue;
for (j = 0; j < entries[i].qwords; j++)
xe_pt_destroy(entries[i].pt_entries[j].pt, xe_vma_vm(vma)->flags, NULL);
if (pt->level) {
for (j = 0; j < entries[i].qwords; j++)
xe_pt_destroy(entries[i].pt_entries[j].pt,
xe_vma_vm(vma)->flags, NULL);
}
kfree(entries[i].pt_entries);
entries[i].pt_entries = NULL;
entries[i].qwords = 0;
}
}
@ -874,10 +882,61 @@ static void xe_pt_commit_locks_assert(struct xe_vma *vma)
xe_vm_assert_held(vm);
}
static void xe_pt_commit_bind(struct xe_vma *vma,
struct xe_vm_pgtable_update *entries,
u32 num_entries, bool rebind,
struct llist_head *deferred)
static void xe_pt_commit(struct xe_vma *vma,
struct xe_vm_pgtable_update *entries,
u32 num_entries, struct llist_head *deferred)
{
u32 i, j;
xe_pt_commit_locks_assert(vma);
for (i = 0; i < num_entries; i++) {
struct xe_pt *pt = entries[i].pt;
if (!pt->level)
continue;
for (j = 0; j < entries[i].qwords; j++) {
struct xe_pt *oldpte = entries[i].pt_entries[j].pt;
xe_pt_destroy(oldpte, xe_vma_vm(vma)->flags, deferred);
}
}
}
static void xe_pt_abort_bind(struct xe_vma *vma,
struct xe_vm_pgtable_update *entries,
u32 num_entries, bool rebind)
{
int i, j;
xe_pt_commit_locks_assert(vma);
for (i = num_entries - 1; i >= 0; --i) {
struct xe_pt *pt = entries[i].pt;
struct xe_pt_dir *pt_dir;
if (!rebind)
pt->num_live -= entries[i].qwords;
if (!pt->level)
continue;
pt_dir = as_xe_pt_dir(pt);
for (j = 0; j < entries[i].qwords; j++) {
u32 j_ = j + entries[i].ofs;
struct xe_pt *newpte = xe_pt_entry(pt_dir, j_);
struct xe_pt *oldpte = entries[i].pt_entries[j].pt;
pt_dir->children[j_] = oldpte ? &oldpte->base : 0;
xe_pt_destroy(newpte, xe_vma_vm(vma)->flags, NULL);
}
}
}
static void xe_pt_commit_prepare_bind(struct xe_vma *vma,
struct xe_vm_pgtable_update *entries,
u32 num_entries, bool rebind)
{
u32 i, j;
@ -897,12 +956,13 @@ static void xe_pt_commit_bind(struct xe_vma *vma,
for (j = 0; j < entries[i].qwords; j++) {
u32 j_ = j + entries[i].ofs;
struct xe_pt *newpte = entries[i].pt_entries[j].pt;
struct xe_pt *oldpte = NULL;
if (xe_pt_entry(pt_dir, j_))
xe_pt_destroy(xe_pt_entry(pt_dir, j_),
xe_vma_vm(vma)->flags, deferred);
oldpte = xe_pt_entry(pt_dir, j_);
pt_dir->children[j_] = &newpte->base;
entries[i].pt_entries[j].pt = oldpte;
}
}
}
@ -926,8 +986,6 @@ xe_pt_prepare_bind(struct xe_tile *tile, struct xe_vma *vma,
err = xe_pt_stage_bind(tile, vma, entries, num_entries);
if (!err)
xe_tile_assert(tile, *num_entries);
else /* abort! */
xe_pt_abort_bind(vma, entries, *num_entries);
return err;
}
@ -1305,10 +1363,10 @@ static void invalidation_fence_work_func(struct work_struct *w)
ifence->end, ifence->asid);
}
static int invalidation_fence_init(struct xe_gt *gt,
struct invalidation_fence *ifence,
struct dma_fence *fence,
u64 start, u64 end, u32 asid)
static void invalidation_fence_init(struct xe_gt *gt,
struct invalidation_fence *ifence,
struct dma_fence *fence,
u64 start, u64 end, u32 asid)
{
int ret;
@ -1340,8 +1398,6 @@ static int invalidation_fence_init(struct xe_gt *gt,
}
xe_gt_assert(gt, !ret || ret == -ENOENT);
return ret && ret != -ENOENT ? ret : 0;
}
struct xe_pt_stage_unbind_walk {
@ -1426,6 +1482,7 @@ xe_pt_stage_unbind_post_descend(struct xe_ptw *parent, pgoff_t offset,
struct xe_pt *xe_child = container_of(*child, typeof(*xe_child), base);
pgoff_t end_offset;
u64 size = 1ull << walk->shifts[--level];
int err;
if (!IS_ALIGNED(addr, size))
addr = xe_walk->modified_start;
@ -1441,7 +1498,10 @@ xe_pt_stage_unbind_post_descend(struct xe_ptw *parent, pgoff_t offset,
&end_offset))
return 0;
(void)xe_pt_new_shared(&xe_walk->wupd, xe_child, offset, false);
err = xe_pt_new_shared(&xe_walk->wupd, xe_child, offset, true);
if (err)
return err;
xe_walk->wupd.updates[level].update->qwords = end_offset - offset;
return 0;
@ -1509,32 +1569,54 @@ xe_migrate_clear_pgtable_callback(struct xe_migrate_pt_update *pt_update,
memset64(ptr, empty, num_qwords);
}
static void
xe_pt_commit_unbind(struct xe_vma *vma,
struct xe_vm_pgtable_update *entries, u32 num_entries,
struct llist_head *deferred)
static void xe_pt_abort_unbind(struct xe_vma *vma,
struct xe_vm_pgtable_update *entries,
u32 num_entries)
{
u32 j;
int i, j;
xe_pt_commit_locks_assert(vma);
for (j = 0; j < num_entries; ++j) {
struct xe_vm_pgtable_update *entry = &entries[j];
for (i = num_entries - 1; i >= 0; --i) {
struct xe_vm_pgtable_update *entry = &entries[i];
struct xe_pt *pt = entry->pt;
struct xe_pt_dir *pt_dir = as_xe_pt_dir(pt);
pt->num_live += entry->qwords;
if (!pt->level)
continue;
for (j = entry->ofs; j < entry->ofs + entry->qwords; j++)
pt_dir->children[i] =
entries[i].pt_entries[j - entry->ofs].pt ?
&entries[i].pt_entries[j - entry->ofs].pt->base : NULL;
}
}
static void
xe_pt_commit_prepare_unbind(struct xe_vma *vma,
struct xe_vm_pgtable_update *entries,
u32 num_entries)
{
int i, j;
xe_pt_commit_locks_assert(vma);
for (i = 0; i < num_entries; ++i) {
struct xe_vm_pgtable_update *entry = &entries[i];
struct xe_pt *pt = entry->pt;
struct xe_pt_dir *pt_dir;
pt->num_live -= entry->qwords;
if (pt->level) {
struct xe_pt_dir *pt_dir = as_xe_pt_dir(pt);
u32 i;
if (!pt->level)
continue;
for (i = entry->ofs; i < entry->ofs + entry->qwords;
i++) {
if (xe_pt_entry(pt_dir, i))
xe_pt_destroy(xe_pt_entry(pt_dir, i),
xe_vma_vm(vma)->flags, deferred);
pt_dir->children[i] = NULL;
}
pt_dir = as_xe_pt_dir(pt);
for (j = entry->ofs; j < entry->ofs + entry->qwords; j++) {
entry->pt_entries[j - entry->ofs].pt =
xe_pt_entry(pt_dir, j);
pt_dir->children[j] = NULL;
}
}
}
@ -1580,7 +1662,6 @@ static int bind_op_prepare(struct xe_vm *vm, struct xe_tile *tile,
{
u32 current_op = pt_update_ops->current_op;
struct xe_vm_pgtable_update_op *pt_op = &pt_update_ops->ops[current_op];
struct llist_head *deferred = &pt_update_ops->deferred;
int err;
xe_bo_assert_held(xe_vma_bo(vma));
@ -1628,11 +1709,12 @@ static int bind_op_prepare(struct xe_vm *vm, struct xe_tile *tile,
/* We bump also if batch_invalidate_tlb is true */
vm->tlb_flush_seqno++;
/* FIXME: Don't commit right away */
vma->tile_staged |= BIT(tile->id);
pt_op->vma = vma;
xe_pt_commit_bind(vma, pt_op->entries, pt_op->num_entries,
pt_op->rebind, deferred);
xe_pt_commit_prepare_bind(vma, pt_op->entries,
pt_op->num_entries, pt_op->rebind);
} else {
xe_pt_cancel_bind(vma, pt_op->entries, pt_op->num_entries);
}
return err;
@ -1644,7 +1726,6 @@ static int unbind_op_prepare(struct xe_tile *tile,
{
u32 current_op = pt_update_ops->current_op;
struct xe_vm_pgtable_update_op *pt_op = &pt_update_ops->ops[current_op];
struct llist_head *deferred = &pt_update_ops->deferred;
int err;
if (!((vma->tile_present | vma->tile_staged) & BIT(tile->id)))
@ -1680,9 +1761,7 @@ static int unbind_op_prepare(struct xe_tile *tile,
pt_update_ops->needs_userptr_lock |= xe_vma_is_userptr(vma);
pt_update_ops->needs_invalidation = true;
/* FIXME: Don't commit right away */
xe_pt_commit_unbind(vma, pt_op->entries, pt_op->num_entries,
deferred);
xe_pt_commit_prepare_unbind(vma, pt_op->entries, pt_op->num_entries);
return 0;
}
@ -1903,7 +1982,7 @@ xe_pt_update_ops_run(struct xe_tile *tile, struct xe_vma_ops *vops)
struct invalidation_fence *ifence = NULL;
struct xe_range_fence *rfence;
struct xe_vma_op *op;
int err = 0;
int err = 0, i;
struct xe_migrate_pt_update update = {
.ops = pt_update_ops->needs_userptr_lock ?
&userptr_migrate_ops :
@ -1923,8 +2002,10 @@ xe_pt_update_ops_run(struct xe_tile *tile, struct xe_vma_ops *vops)
if (pt_update_ops->needs_invalidation) {
ifence = kzalloc(sizeof(*ifence), GFP_KERNEL);
if (!ifence)
return ERR_PTR(-ENOMEM);
if (!ifence) {
err = -ENOMEM;
goto kill_vm_tile1;
}
}
rfence = kzalloc(sizeof(*rfence), GFP_KERNEL);
@ -1939,6 +2020,15 @@ xe_pt_update_ops_run(struct xe_tile *tile, struct xe_vma_ops *vops)
goto free_rfence;
}
/* Point of no return - VM killed if failure after this */
for (i = 0; i < pt_update_ops->current_op; ++i) {
struct xe_vm_pgtable_update_op *pt_op = &pt_update_ops->ops[i];
xe_pt_commit(pt_op->vma, pt_op->entries,
pt_op->num_entries, &pt_update_ops->deferred);
pt_op->vma = NULL; /* skip in xe_pt_update_ops_abort */
}
if (xe_range_fence_insert(&vm->rftree[tile->id], rfence,
&xe_range_fence_kfree_ops,
pt_update_ops->start,
@ -1947,12 +2037,9 @@ xe_pt_update_ops_run(struct xe_tile *tile, struct xe_vma_ops *vops)
/* tlb invalidation must be done before signaling rebind */
if (ifence) {
err = invalidation_fence_init(tile->primary_gt, ifence, fence,
pt_update_ops->start,
pt_update_ops->last,
vm->usm.asid);
if (err)
goto put_fence;
invalidation_fence_init(tile->primary_gt, ifence, fence,
pt_update_ops->start,
pt_update_ops->last, vm->usm.asid);
fence = &ifence->base.base;
}
@ -1969,14 +2056,13 @@ xe_pt_update_ops_run(struct xe_tile *tile, struct xe_vma_ops *vops)
return fence;
put_fence:
if (pt_update_ops->needs_userptr_lock)
up_read(&vm->userptr.notifier_lock);
dma_fence_put(fence);
free_rfence:
kfree(rfence);
free_ifence:
kfree(ifence);
kill_vm_tile1:
if (err != -EAGAIN && tile->id)
xe_vm_kill(vops->vm, false);
return ERR_PTR(err);
}
@ -1997,12 +2083,10 @@ void xe_pt_update_ops_fini(struct xe_tile *tile, struct xe_vma_ops *vops)
lockdep_assert_held(&vops->vm->lock);
xe_vm_assert_held(vops->vm);
/* FIXME: Not 100% correct */
for (i = 0; i < pt_update_ops->num_ops; ++i) {
for (i = 0; i < pt_update_ops->current_op; ++i) {
struct xe_vm_pgtable_update_op *pt_op = &pt_update_ops->ops[i];
if (pt_op->bind)
xe_pt_free_bind(pt_op->entries, pt_op->num_entries);
xe_pt_free_bind(pt_op->entries, pt_op->num_entries);
}
xe_bo_put_commit(&vops->pt_update_ops[tile->id].deferred);
}
@ -2016,10 +2100,28 @@ void xe_pt_update_ops_fini(struct xe_tile *tile, struct xe_vma_ops *vops)
*/
void xe_pt_update_ops_abort(struct xe_tile *tile, struct xe_vma_ops *vops)
{
struct xe_vm_pgtable_update_ops *pt_update_ops =
&vops->pt_update_ops[tile->id];
int i;
lockdep_assert_held(&vops->vm->lock);
xe_vm_assert_held(vops->vm);
/* FIXME: Just kill VM for now + cleanup PTs */
for (i = pt_update_ops->num_ops - 1; i >= 0; --i) {
struct xe_vm_pgtable_update_op *pt_op =
&pt_update_ops->ops[i];
if (!pt_op->vma || i >= pt_update_ops->current_op)
continue;
if (pt_op->bind)
xe_pt_abort_bind(pt_op->vma, pt_op->entries,
pt_op->num_entries,
pt_op->rebind);
else
xe_pt_abort_unbind(pt_op->vma, pt_op->entries,
pt_op->num_entries);
}
xe_bo_put_commit(&vops->pt_update_ops[tile->id].deferred);
xe_vm_kill(vops->vm, false);
}