[src/trunk]: src/sys/external/bsd/drm2/linux reservation_object_get_excl_rcu

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

details:   https://anonhg.NetBSD.org/src/rev/499b1f204037
branches:  trunk
changeset: 1027948:499b1f204037
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Sun Dec 19 01:20:22 2021 +0000

description:
reservation_object_get_excl_rcu

diffstat:

 sys/external/bsd/drm2/include/linux/reservation.h |   5 +++-
 sys/external/bsd/drm2/linux/linux_reservation.c   |  24 +++++++++++++++++++++-
 2 files changed, 26 insertions(+), 3 deletions(-)

diffs (71 lines):

diff -r 1d21e429477c -r 499b1f204037 sys/external/bsd/drm2/include/linux/reservation.h
--- a/sys/external/bsd/drm2/include/linux/reservation.h Sun Dec 19 01:20:15 2021 +0000
+++ b/sys/external/bsd/drm2/include/linux/reservation.h Sun Dec 19 01:20:22 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: reservation.h,v 1.9 2021/12/19 00:28:37 riastradh Exp $        */
+/*     $NetBSD: reservation.h,v 1.10 2021/12/19 01:20:22 riastradh Exp $       */
 
 /*-
  * Copyright (c) 2018 The NetBSD Foundation, Inc.
@@ -65,6 +65,7 @@
 #define        reservation_object_add_shared_fence     linux_reservation_object_add_shared_fence
 #define        reservation_object_fini                 linux_reservation_object_fini
 #define        reservation_object_get_excl             linux_reservation_object_get_excl
+#define        reservation_object_get_excl_rcu         linux_reservation_object_get_excl_rcu
 #define        reservation_object_get_fences_rcu       linux_reservation_object_get_fences_rcu
 #define        reservation_object_get_list             linux_reservation_object_get_list
 #define        reservation_object_held                 linux_reservation_object_held
@@ -93,6 +94,8 @@
 void   reservation_object_add_shared_fence(struct reservation_object *,
            struct dma_fence *);
 
+struct dma_fence *
+       reservation_object_get_excl_rcu(struct reservation_object *);
 int    reservation_object_get_fences_rcu(struct reservation_object *,
            struct dma_fence **, unsigned *, struct dma_fence ***);
 
diff -r 1d21e429477c -r 499b1f204037 sys/external/bsd/drm2/linux/linux_reservation.c
--- a/sys/external/bsd/drm2/linux/linux_reservation.c   Sun Dec 19 01:20:15 2021 +0000
+++ b/sys/external/bsd/drm2/linux/linux_reservation.c   Sun Dec 19 01:20:22 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: linux_reservation.c,v 1.15 2021/12/19 00:31:43 riastradh Exp $ */
+/*     $NetBSD: linux_reservation.c,v 1.16 2021/12/19 01:20:22 riastradh Exp $ */
 
 /*-
  * Copyright (c) 2018 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_reservation.c,v 1.15 2021/12/19 00:31:43 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: linux_reservation.c,v 1.16 2021/12/19 01:20:22 riastradh Exp $");
 
 #include <sys/param.h>
 #include <sys/poll.h>
@@ -474,6 +474,26 @@
                dma_fence_put(replace);
 }
 
+/*
+ * reservation_object_get_excl_rcu(robj)
+ *
+ *     Note: Caller need not call this from an RCU read section.
+ */
+struct dma_fence *
+reservation_object_get_excl_rcu(struct reservation_object *robj)
+{
+       struct dma_fence *fence;
+
+       rcu_read_lock();
+       fence = dma_fence_get_rcu_safe(&robj->robj_fence);
+       rcu_read_unlock();
+
+       return fence;
+}
+
+/*
+ * reservation_object_get_fences_rcu(robj, fencep, nsharedp, sharedp)
+ */
 int
 reservation_object_get_fences_rcu(struct reservation_object *robj,
     struct dma_fence **fencep, unsigned *nsharedp, struct dma_fence ***sharedp)