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drm/amdkfd: inc counter on child ranges with xnack off

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During GPU page table invalidation with xnack off, new ranges
split may occur concurrently in the same prange. Creating a new
child per split. Each child should also increment its
invalid counter, to assure GPU page table updates in these
ranges.

Signed-off-by: Alex Sierra <alex.sierra@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Sierra 2021-06-29 11:40:47 -05:00 committed by Alex Deucher
parent 1d40ef902d
commit 9e4a91cd9e
1 changed files with 14 additions and 2 deletions
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16
drivers/gpu/drm/amd/amdkfd/kfd_svm.c
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@ -1590,6 +1590,7 @@ svm_range_evict(struct svm_range *prange, struct mm_struct *mm,
unsigned long start, unsigned long last)
{
struct svm_range_list *svms = prange->svms;
struct svm_range *pchild;
struct kfd_process *p;
int r = 0;
@ -1601,7 +1602,19 @@ svm_range_evict(struct svm_range *prange, struct mm_struct *mm,
if (!p->xnack_enabled) {
int evicted_ranges;
atomic_inc(&prange->invalid);
list_for_each_entry(pchild, &prange->child_list, child_list) {
mutex_lock_nested(&pchild->lock, 1);
if (pchild->start <= last && pchild->last >= start) {
pr_debug("increment pchild invalid [0x%lx 0x%lx]\n",
pchild->start, pchild->last);
atomic_inc(&pchild->invalid);
}
mutex_unlock(&pchild->lock);
}
if (prange->start <= last && prange->last >= start)
atomic_inc(&prange->invalid);
evicted_ranges = atomic_inc_return(&svms->evicted_ranges);
if (evicted_ranges != 1)
return r;
@ -1618,7 +1631,6 @@ svm_range_evict(struct svm_range *prange, struct mm_struct *mm,
schedule_delayed_work(&svms->restore_work,
msecs_to_jiffies(AMDGPU_SVM_RANGE_RESTORE_DELAY_MS));
} else {
struct svm_range *pchild;
unsigned long s, l;
pr_debug("invalidate unmap svms 0x%p [0x%lx 0x%lx] from GPUs\n",