[v2 31/31] drm/xe/svm: Migration from sram to vram for system allocator

[Oak Zeng]

If applicable, migrate a vma from sram to vram for system allocator.
Traditional userptr is not migrated. Only userptr created during
fault (aka userptr splitted from system allocator vma) can be
migrated.

FIXME: The migration should be conditional on user memory attributes
setting. Add this logic when memory attributes are supported

Signed-off-by: Oak Zeng <oak.zeng at intel.com>
---
 drivers/gpu/drm/xe/xe_gt_pagefault.c | 9 ++++++++-
 drivers/gpu/drm/xe/xe_vm.c           | 4 ----
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_gt_pagefault.c b/drivers/gpu/drm/xe/xe_gt_pagefault.c
index 668984f0769e..c6ba00049964 100644
--- a/drivers/gpu/drm/xe/xe_gt_pagefault.c
+++ b/drivers/gpu/drm/xe/xe_gt_pagefault.c
@@ -20,6 +20,7 @@
 #include "xe_guc_ct.h"
 #include "xe_migrate.h"
 #include "xe_trace.h"
+#include "xe_svm.h"
 #include "xe_vm.h"
 
 struct pagefault {
@@ -209,12 +210,18 @@ static int handle_pagefault(struct xe_gt *gt, struct pagefault *pf)
 
 	if (xe_vma_is_userptr(vma) && write_locked) {
 		struct xe_userptr_vma *uvma = to_userptr_vma(vma);
+		struct xe_userptr *userptr = &uvma->userptr;
 
 		spin_lock(&vm->userptr.invalidated_lock);
-		list_del_init(&uvma->userptr.invalidate_link);
+		list_del_init(&userptr->invalidate_link);
 		spin_unlock(&vm->userptr.invalidated_lock);
 
+		mmap_read_lock(userptr->notifier.mm);
+		/**FIXME: Add migration policy here*/
+		if (xe_vma_is_fault_userptr(vma))
+			xe_svm_migrate_vma_to_vram(vm, vma, tile);
 		ret = xe_vma_userptr_pin_pages(uvma);
+		mmap_read_unlock(userptr->notifier.mm);
 		if (ret)
 			goto unlock_vm;
 
diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index 498b36469d00..8a58fe144a02 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -71,16 +71,12 @@ int xe_vma_userptr_pin_pages(struct xe_userptr_vma *uvma)
 	struct xe_vma *vma = &uvma->vma;
 	struct xe_vm *vm = xe_vma_vm(vma);
 	struct xe_device *xe = vm->xe;
-	struct xe_userptr *userptr;
 	int ret;
 
 	lockdep_assert_held(&vm->lock);
 	xe_assert(xe, xe_vma_is_userptr(vma));
 
-	userptr = &uvma->userptr;
-	mmap_read_lock(userptr->notifier.mm);
 	ret = xe_userptr_populate_range(uvma);
-	mmap_read_unlock(userptr->notifier.mm);
 
 	return ret;
 }
-- 
2.26.3