[src/trunk]: src/sys/external/bsd/ena-com ena: Fix rmb/wmb/mb to match Linux ...

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

details:   https://anonhg.NetBSD.org/src/rev/976398e2046e
branches:  trunk
changeset: 365127:976398e2046e
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Sat Apr 09 12:49:36 2022 +0000

description:
ena: Fix rmb/wmb/mb to match Linux on x86 and aarch64.

This is not right but it's not worse than it was before.

diffstat:

 sys/external/bsd/ena-com/ena_plat.h |  17 ++++++++++++++++-
 1 files changed, 16 insertions(+), 1 deletions(-)

diffs (36 lines):

diff -r dd250dfda4cd -r 976398e2046e sys/external/bsd/ena-com/ena_plat.h
--- a/sys/external/bsd/ena-com/ena_plat.h       Sat Apr 09 12:07:37 2022 +0000
+++ b/sys/external/bsd/ena-com/ena_plat.h       Sat Apr 09 12:49:36 2022 +0000
@@ -38,7 +38,7 @@
 #if 0
 __FBSDID("$FreeBSD: head/sys/contrib/ena-com/ena_plat.h 333453 2018-05-10 09:25:51Z mw $");
 #endif
-__KERNEL_RCSID(0, "$NetBSD: ena_plat.h,v 1.7 2021/07/19 21:16:33 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ena_plat.h,v 1.8 2022/04/09 12:49:36 riastradh Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -378,8 +378,23 @@
 
 #include "ena_defs/ena_includes.h"
 
+/*
+ * XXX This is not really right.  Need to adjust the driver to use
+ * bus_space_barrier or bus_dmamap_sync.
+ */
+#if defined(__i386__) || defined(__x86_64__)
+#include <x86/cpufunc.h>
+#define        rmb()           x86_lfence()
+#define        wmb()           x86_sfence()
+#define        mb()            x86_mfence()
+#elif defined(__aarch64__)
+#define        rmb()           __asm __volatile("dsb ld" ::: "memory")
+#define        wmb()           __asm __volatile("dsb st" ::: "memory")
+#define        mb()            __asm __volatile("dsb sy" ::: "memory")
+#else
 #define        rmb()           membar_enter()
 #define        wmb()           membar_exit()
 #define        mb()            membar_sync()
+#endif
 
 #endif /* ENA_PLAT_H_ */