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drm/amdkfd: optimize svm range evict

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It is to avoid unnecessary queue eviction when range
is not mapped to gpu.

Signed-off-by: Eric Huang <jinhuieric.huang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Eric Huang 2022-06-30 14:49:39 -04:00 committed by Alex Deucher
parent 1f374171fd
commit f72fc9bd22
1 changed files with 9 additions and 1 deletions
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10
drivers/gpu/drm/amd/amdkfd/kfd_svm.c
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@ -1778,8 +1778,12 @@ svm_range_evict(struct svm_range *prange, struct mm_struct *mm,
if (!p->xnack_enabled ||
(prange->flags & KFD_IOCTL_SVM_FLAG_GPU_ALWAYS_MAPPED)) {
int evicted_ranges;
bool mapped = prange->mapped_to_gpu;
list_for_each_entry(pchild, &prange->child_list, child_list) {
if (!pchild->mapped_to_gpu)
continue;
mapped = true;
mutex_lock_nested(&pchild->lock, 1);
if (pchild->start <= last && pchild->last >= start) {
pr_debug("increment pchild invalid [0x%lx 0x%lx]\n",
@ -1789,6 +1793,9 @@ svm_range_evict(struct svm_range *prange, struct mm_struct *mm,
mutex_unlock(&pchild->lock);
}
if (!mapped)
return r;
if (prange->start <= last && prange->last >= start)
atomic_inc(&prange->invalid);
@ -3345,7 +3352,8 @@ svm_range_set_attr(struct kfd_process *p, struct mm_struct *mm,
goto out_unlock_range;
if (migrated && (!p->xnack_enabled ||
(prange->flags & KFD_IOCTL_SVM_FLAG_GPU_ALWAYS_MAPPED))) {
(prange->flags & KFD_IOCTL_SVM_FLAG_GPU_ALWAYS_MAPPED)) &&
prange->mapped_to_gpu) {
pr_debug("restore_work will update mappings of GPUs\n");
mutex_unlock(&prange->migrate_mutex);
continue;