[PATCH v2 23/29] drm/xe: Add BO flags required for SVM

[Matthew Brost]

Add XE_BO_FLAG_SYSTEM_ALLOC to indicate BO is tied to SVM range.

Add XE_BO_FLAG_SKIP_CLEAR to indicate BO does not need to cleared.

v2:
 - Take VM ref for system allocator BOs

Signed-off-by: Matthew Brost <matthew.brost at intel.com>
---
 drivers/gpu/drm/xe/xe_bo.c | 15 +++++++++------
 drivers/gpu/drm/xe/xe_bo.h |  2 ++
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_bo.c b/drivers/gpu/drm/xe/xe_bo.c
index a02d63e322ae..dbd03383878e 100644
--- a/drivers/gpu/drm/xe/xe_bo.c
+++ b/drivers/gpu/drm/xe/xe_bo.c
@@ -685,8 +685,9 @@ static int xe_bo_move(struct ttm_buffer_object *ttm_bo, bool evict,
 	move_lacks_source = !old_mem || (handle_system_ccs ? (!bo->ccs_cleared) :
 					 (!mem_type_is_vram(old_mem_type) && !tt_has_data));
 
-	needs_clear = (ttm && ttm->page_flags & TTM_TT_FLAG_ZERO_ALLOC) ||
-		(!ttm && ttm_bo->type == ttm_bo_type_device);
+	needs_clear = !(bo->flags & XE_BO_FLAG_SKIP_CLEAR) &&
+		((ttm && ttm->page_flags & TTM_TT_FLAG_ZERO_ALLOC) ||
+		(!ttm && ttm_bo->type == ttm_bo_type_device));
 
 	if (new_mem->mem_type == XE_PL_TT) {
 		ret = xe_tt_map_sg(ttm);
@@ -1145,7 +1146,7 @@ static void xe_ttm_bo_destroy(struct ttm_buffer_object *ttm_bo)
 		xe_drm_client_remove_bo(bo);
 #endif
 
-	if (bo->vm && xe_bo_is_user(bo))
+	if (bo->vm && (xe_bo_is_user(bo) || bo->flags & XE_BO_FLAG_SYSTEM_ALLOC))
 		xe_vm_put(bo->vm);
 
 	mutex_lock(&xe->mem_access.vram_userfault.lock);
@@ -1301,7 +1302,8 @@ struct xe_bo *___xe_bo_create_locked(struct xe_device *xe, struct xe_bo *bo,
 	int err;
 
 	/* Only kernel objects should set GT */
-	xe_assert(xe, !tile || type == ttm_bo_type_kernel);
+	xe_assert(xe, !tile || type == ttm_bo_type_kernel ||
+		  flags & XE_BO_FLAG_SYSTEM_ALLOC);
 
 	if (XE_WARN_ON(!size)) {
 		xe_bo_free(bo);
@@ -1493,7 +1495,7 @@ __xe_bo_create_locked(struct xe_device *xe,
 	 * by having all the vm's bo refereferences released at vm close
 	 * time.
 	 */
-	if (vm && xe_bo_is_user(bo))
+	if (vm && (xe_bo_is_user(bo) || bo->flags & XE_BO_FLAG_SYSTEM_ALLOC))
 		xe_vm_get(vm);
 	bo->vm = vm;
 
@@ -2333,7 +2335,8 @@ bool xe_bo_needs_ccs_pages(struct xe_bo *bo)
 	 * can't be used since there's no CCS storage associated with
 	 * non-VRAM addresses.
 	 */
-	if (IS_DGFX(xe) && (bo->flags & XE_BO_FLAG_SYSTEM))
+	if (IS_DGFX(xe) && ((bo->flags & XE_BO_FLAG_SYSTEM) ||
+	    (bo->flags & XE_BO_FLAG_SYSTEM_ALLOC)))
 		return false;
 
 	return true;
diff --git a/drivers/gpu/drm/xe/xe_bo.h b/drivers/gpu/drm/xe/xe_bo.h
index 7fa44a0138b0..caf0459d16ad 100644
--- a/drivers/gpu/drm/xe/xe_bo.h
+++ b/drivers/gpu/drm/xe/xe_bo.h
@@ -39,6 +39,8 @@
 #define XE_BO_FLAG_NEEDS_64K		BIT(15)
 #define XE_BO_FLAG_NEEDS_2M		BIT(16)
 #define XE_BO_FLAG_GGTT_INVALIDATE	BIT(17)
+#define XE_BO_FLAG_SYSTEM_ALLOC		BIT(18)
+#define XE_BO_FLAG_SKIP_CLEAR		BIT(19)
 /* this one is trigger internally only */
 #define XE_BO_FLAG_INTERNAL_TEST	BIT(30)
 #define XE_BO_FLAG_INTERNAL_64K		BIT(31)
-- 
2.34.1