[PATCH 20/44] drm/amdkfd: invalidate tables on page retry fault
Felix Kuehling
Felix.Kuehling at amd.com
Mon Mar 22 10:58:36 UTC 2021
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 at amd.com>
Signed-off-by: Philip Yang <Philip.Yang at amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com>
---
drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 6 +-
drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 71 +++++++++++++++++++-----
drivers/gpu/drm/amd/amdkfd/kfd_svm.h | 4 +-
3 files changed, 64 insertions(+), 17 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
index 1243cf02f872..8ce3ff56a0ce 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
@@ -789,7 +789,11 @@ static vm_fault_t svm_migrate_to_ram(struct vm_fault *vmf)
list_for_each_entry_safe(prange, next, &update_list, update_list) {
enum svm_work_list_ops op;
- op = SVM_OP_UPDATE_RANGE_NOTIFIER;
+ /* xnack on, update mapping on GPUs with ACCESS_IN_PLACE */
+ if (p->xnack_enabled && prange == pmigrate)
+ op = SVM_OP_UPDATE_RANGE_NOTIFIER_AND_MAP;
+ else
+ op = SVM_OP_UPDATE_RANGE_NOTIFIER;
svm_range_add_list_work(&p->svms, prange, mm, op);
list_del_init(&prange->update_list);
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
index 69241ed4a377..fb8ca844d9bd 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -1006,6 +1006,13 @@ svm_range_split_by_granularity(struct kfd_process *p, struct mm_struct *mm,
*pmigrate = new;
+ /* xnack on, update mapping on GPUs with ACCESS_IN_PLACE */
+ if (p->xnack_enabled && (*pmigrate)->work_item.op == SVM_OP_ADD_RANGE) {
+ (*pmigrate)->work_item.op = SVM_OP_ADD_RANGE_AND_MAP;
+ pr_debug("change prange 0x%p [0x%lx 0x%lx] op %d\n",
+ *pmigrate, (*pmigrate)->start, (*pmigrate)->last,
+ SVM_OP_ADD_RANGE_AND_MAP);
+ }
return 0;
}
@@ -1407,25 +1414,38 @@ 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 invalid, evicted_ranges;
+ struct kfd_process *p;
int r = 0;
- invalid = atomic_inc_return(&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 invalid, evicted_ranges;
+
+ invalid = atomic_inc_return(&prange->invalid);
+ evicted_ranges = atomic_inc_return(&svms->evicted_ranges);
+ if (evicted_ranges != 1)
+ return r;
- 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));
+ 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 {
+ pr_debug("invalidate unmap svms 0x%p [0x%lx 0x%lx] from GPUs\n",
+ prange->svms, start, last);
+ svm_range_unmap_from_gpus(prange, start, last);
+ }
return r;
}
@@ -1621,6 +1641,7 @@ static void
svm_range_handle_list_op(struct svm_range_list *svms, struct svm_range *prange)
{
struct mm_struct *mm = prange->work_item.mm;
+ int r;
switch (prange->work_item.op) {
case SVM_OP_NULL:
@@ -1639,12 +1660,32 @@ 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);
+
+ r = svm_range_map_to_gpus(prange, true);
+ if (r)
+ pr_debug("failed %d map 0x%p [0x%lx 0x%lx]\n",
+ r, svms, prange->start, prange->last);
+ 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);
+ r = svm_range_map_to_gpus(prange, true);
+ if (r)
+ pr_debug("failed %d map 0x%p [0x%lx 0x%lx]\n",
+ r, svms, prange->start, prange->last);
+ break;
default:
WARN_ONCE(1, "Unknown prange 0x%p work op %d\n", prange,
prange->work_item.op);
@@ -2235,7 +2276,7 @@ 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 e6b737889bb3..3f945a601546 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.h
@@ -43,7 +43,9 @@ 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 {
--
2.31.0
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