[PATCH 5.15 073/196] drm/i915/ttm: tweak priority hint selection

[Greg Kroah-Hartman]

From: Matthew Auld <matthew.auld@xxxxxxxxx>

commit 0bdc0a0699929c814a8aecd55d2accb8c11beae2 upstream.

For some reason we are selecting PRIO_HAS_PAGES when we don't have
mm.pages, and vice versa.

v2(Thomas):
  - Add missing fixes tag

Fixes: 213d50927763 ("drm/i915/ttm: Introduce a TTM i915 gem object backend")
Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx>
Cc: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
Reviewed-by: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20220209111652.468762-1-matthew.auld@xxxxxxxxx
(cherry picked from commit ba2c5d15022a565da187d90e2fe44768e33e5034)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/gem/i915_gem_ttm.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
@@ -759,11 +759,9 @@ static void i915_ttm_adjust_lru(struct d
 	if (obj->mm.madv != I915_MADV_WILLNEED) {
 		bo->priority = I915_TTM_PRIO_PURGE;
 	} else if (!i915_gem_object_has_pages(obj)) {
-		if (bo->priority < I915_TTM_PRIO_HAS_PAGES)
-			bo->priority = I915_TTM_PRIO_HAS_PAGES;
+		bo->priority = I915_TTM_PRIO_NO_PAGES;
 	} else {
-		if (bo->priority > I915_TTM_PRIO_NO_PAGES)
-			bo->priority = I915_TTM_PRIO_NO_PAGES;
+		bo->priority = I915_TTM_PRIO_HAS_PAGES;
 	}
 
 	ttm_bo_move_to_lru_tail(bo, bo->resource, NULL);