GPU page tables are invalidated by unmapping prange directly at the mmu notifier, when page fault retry is enabled through amdgpu_noretry global parameter. The restore page table is performed at the page fault handler.
If xnack is on, we update GPU mappings after migration to avoid unnecessary GPUVM faults.
Signed-off-by: Alex Sierra alex.sierra@amd.com Signed-off-by: Philip Yang Philip.Yang@amd.com Reviewed-by: Felix Kuehling Felix.Kuehling@amd.com Signed-off-by: Felix Kuehling Felix.Kuehling@amd.com --- drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 6 +- drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 77 +++++++++++++++++++----- drivers/gpu/drm/amd/amdkfd/kfd_svm.h | 4 +- 3 files changed, 70 insertions(+), 17 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c index c47a673ef24e..5e0fec5dbcd6 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c @@ -808,7 +808,11 @@ static vm_fault_t svm_migrate_to_ram(struct vm_fault *vmf) pr_debug("failed %d migrate 0x%p [0x%lx 0x%lx] to ram\n", r, prange, prange->start, prange->last);
- op = SVM_OP_UPDATE_RANGE_NOTIFIER; + /* xnack on, update mapping on GPUs with ACCESS_IN_PLACE */ + if (p->xnack_enabled && parent == prange) + op = SVM_OP_UPDATE_RANGE_NOTIFIER_AND_MAP; + else + op = SVM_OP_UPDATE_RANGE_NOTIFIER; svm_range_add_list_work(&p->svms, parent, mm, op); schedule_deferred_list_work(&p->svms);
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c index 5211e7dcf0f8..4e3156d891a2 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c @@ -912,6 +912,13 @@ svm_range_split_by_granularity(struct kfd_process *p, struct mm_struct *mm, svm_range_add_child(parent, mm, tail, SVM_OP_ADD_RANGE); }
+ /* xnack on, update mapping on GPUs with ACCESS_IN_PLACE */ + if (p->xnack_enabled && prange->work_item.op == SVM_OP_ADD_RANGE) { + prange->work_item.op = SVM_OP_ADD_RANGE_AND_MAP; + pr_debug("change prange 0x%p [0x%lx 0x%lx] op %d\n", + prange, prange->start, prange->last, + SVM_OP_ADD_RANGE_AND_MAP); + } return 0; }
@@ -1452,25 +1459,52 @@ svm_range_evict(struct svm_range *prange, struct mm_struct *mm, unsigned long start, unsigned long last) { struct svm_range_list *svms = prange->svms; - int evicted_ranges; + struct kfd_process *p; int r = 0;
- atomic_inc(&prange->invalid); - evicted_ranges = atomic_inc_return(&svms->evicted_ranges); - if (evicted_ranges != 1) - return r; + p = container_of(svms, struct kfd_process, svms);
- pr_debug("evicting svms 0x%p range [0x%lx 0x%lx]\n", - prange->svms, prange->start, prange->last); + pr_debug("invalidate svms 0x%p prange [0x%lx 0x%lx] [0x%lx 0x%lx]\n", + svms, prange->start, prange->last, start, last);
- /* First eviction, stop the queues */ - r = kgd2kfd_quiesce_mm(mm); - if (r) - pr_debug("failed to quiesce KFD\n"); + if (!p->xnack_enabled) { + int evicted_ranges;
- pr_debug("schedule to restore svm %p ranges\n", svms); - schedule_delayed_work(&svms->restore_work, - msecs_to_jiffies(AMDGPU_SVM_RANGE_RESTORE_DELAY_MS)); + atomic_inc(&prange->invalid); + evicted_ranges = atomic_inc_return(&svms->evicted_ranges); + if (evicted_ranges != 1) + return r; + + pr_debug("evicting svms 0x%p range [0x%lx 0x%lx]\n", + prange->svms, prange->start, prange->last); + + /* First eviction, stop the queues */ + r = kgd2kfd_quiesce_mm(mm); + if (r) + pr_debug("failed to quiesce KFD\n"); + + pr_debug("schedule to restore svm %p ranges\n", svms); + 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", + prange->svms, start, last); + list_for_each_entry(pchild, &prange->child_list, child_list) { + mutex_lock_nested(&pchild->lock, 1); + s = max(start, pchild->start); + l = min(last, pchild->last); + if (l >= s) + svm_range_unmap_from_gpus(pchild, s, l); + mutex_unlock(&pchild->lock); + } + s = max(start, prange->start); + l = min(last, prange->last); + if (l >= s) + svm_range_unmap_from_gpus(prange, s, l); + }
return r; } @@ -1673,12 +1707,25 @@ svm_range_handle_list_op(struct svm_range_list *svms, struct svm_range *prange) svms, prange, prange->start, prange->last); svm_range_update_notifier_and_interval_tree(mm, prange); break; + case SVM_OP_UPDATE_RANGE_NOTIFIER_AND_MAP: + pr_debug("update and map 0x%p prange 0x%p [0x%lx 0x%lx]\n", + svms, prange, prange->start, prange->last); + svm_range_update_notifier_and_interval_tree(mm, prange); + /* TODO: implement deferred validation and mapping */ + break; case SVM_OP_ADD_RANGE: pr_debug("add 0x%p prange 0x%p [0x%lx 0x%lx]\n", svms, prange, prange->start, prange->last); svm_range_add_to_svms(prange); svm_range_add_notifier_locked(mm, prange); break; + case SVM_OP_ADD_RANGE_AND_MAP: + pr_debug("add and map 0x%p prange 0x%p [0x%lx 0x%lx]\n", svms, + prange, prange->start, prange->last); + svm_range_add_to_svms(prange); + svm_range_add_notifier_locked(mm, prange); + /* TODO: implement deferred validation and mapping */ + break; default: WARN_ONCE(1, "Unknown prange 0x%p work op %d\n", prange, prange->work_item.op); @@ -2301,7 +2348,7 @@ svm_range_set_attr(struct kfd_process *p, uint64_t start, uint64_t size, if (r) goto out_unlock_range;
- if (migrated) { + if (migrated && !p->xnack_enabled) { pr_debug("restore_work will update mappings of GPUs\n"); mutex_unlock(&prange->migrate_mutex); continue; diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.h b/drivers/gpu/drm/amd/amdkfd/kfd_svm.h index 37cfa1689c4f..d88926d2855f 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.h +++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.h @@ -44,7 +44,9 @@ enum svm_work_list_ops { SVM_OP_NULL, SVM_OP_UNMAP_RANGE, SVM_OP_UPDATE_RANGE_NOTIFIER, - SVM_OP_ADD_RANGE + SVM_OP_UPDATE_RANGE_NOTIFIER_AND_MAP, + SVM_OP_ADD_RANGE, + SVM_OP_ADD_RANGE_AND_MAP };
struct svm_work_list_item {