[src/trunk]: src/sys/external/bsd/drm2/dist/drm/i915 Guess what uvm criterion...

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/2446f3356fe6
branches:  trunk
changeset: 366175:2446f3356fe6
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Mon Aug 27 13:41:37 2018 +0000

description:
Guess what uvm criterion means we should discard backing pages.

diffstat:

 sys/external/bsd/drm2/dist/drm/i915/i915_gem.c |  11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)

diffs (39 lines):

diff -r 988fb32b5105 -r 2446f3356fe6 sys/external/bsd/drm2/dist/drm/i915/i915_gem.c
--- a/sys/external/bsd/drm2/dist/drm/i915/i915_gem.c    Mon Aug 27 13:41:23 2018 +0000
+++ b/sys/external/bsd/drm2/dist/drm/i915/i915_gem.c    Mon Aug 27 13:41:37 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: i915_gem.c,v 1.47 2018/08/27 13:40:28 riastradh Exp $  */
+/*     $NetBSD: i915_gem.c,v 1.48 2018/08/27 13:41:37 riastradh Exp $  */
 
 /*
  * Copyright © 2008-2015 Intel Corporation
@@ -28,7 +28,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: i915_gem.c,v 1.47 2018/08/27 13:40:28 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: i915_gem.c,v 1.48 2018/08/27 13:41:37 riastradh Exp $");
 
 #ifdef __NetBSD__
 #if 0                          /* XXX uvmhist option?  */
@@ -5025,9 +5025,6 @@
 
 static bool discard_backing_storage(struct drm_i915_gem_object *obj)
 {
-#ifdef __NetBSD__
-       panic("XXX");
-#else
        /* If we are the last user of the backing storage (be it shmemfs
         * pages or stolen etc), we know that the pages are going to be
         * immediately released. In this case, we can then skip copying
@@ -5047,6 +5044,10 @@
         * acquiring such a reference whilst we are in the middle of
         * freeing the object.
         */
+#ifdef __NetBSD__
+       /* XXX This number might be a fencepost.  */
+       return obj->base.filp->uo_refs == 1;
+#else
        return atomic_long_read(&obj->base.filp->f_count) == 1;
 #endif
 }