[src/trunk]: src/sys/arch/arm/cortex Enable caching of ITS tables when possible

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

details:   https://anonhg.NetBSD.org/src/rev/e21509032c8d
branches:  trunk
changeset: 452363:e21509032c8d
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sun Jun 30 10:10:19 2019 +0000

description:
Enable caching of ITS tables when possible

diffstat:

 sys/arch/arm/cortex/gicv3_its.c |  17 +++++++++++++----
 1 files changed, 13 insertions(+), 4 deletions(-)

diffs (48 lines):

diff -r 69770a0a4b78 -r e21509032c8d sys/arch/arm/cortex/gicv3_its.c
--- a/sys/arch/arm/cortex/gicv3_its.c   Sun Jun 30 08:49:21 2019 +0000
+++ b/sys/arch/arm/cortex/gicv3_its.c   Sun Jun 30 10:10:19 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: gicv3_its.c,v 1.19 2019/06/29 16:48:07 jmcneill Exp $ */
+/* $NetBSD: gicv3_its.c,v 1.20 2019/06/30 10:10:19 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2018 The NetBSD Foundation, Inc.
@@ -32,7 +32,7 @@
 #define _INTR_PRIVATE
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: gicv3_its.c,v 1.19 2019/06/29 16:48:07 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: gicv3_its.c,v 1.20 2019/06/30 10:10:19 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/kmem.h>
@@ -627,7 +627,8 @@
 
        /* devbits and innercache defaults */
        u_int devbits = __SHIFTOUT(typer, GITS_TYPER_Devbits) + 1;
-       u_int innercache = GITS_Cache_NORMAL_NC;
+       u_int innercache = GITS_Cache_NORMAL_WA_WB;
+       u_int share = GITS_Shareability_IS;
 
        uint32_t iidr = gits_read_4(its, GITS_IIDR);
        const uint32_t ctx =
@@ -697,10 +698,18 @@
                baser &= ~GITS_BASER_InnerCache;
                baser |= __SHIFTIN(innercache, GITS_BASER_InnerCache);
                baser &= ~GITS_BASER_Shareability;
-               baser |= __SHIFTIN(GITS_Shareability_NS, GITS_BASER_Shareability);
+               baser |= __SHIFTIN(share, GITS_BASER_Shareability);
                baser |= GITS_BASER_Valid;
 
                gits_write_8(its, GITS_BASERn(tab), baser);
+
+               baser = gits_read_8(its, GITS_BASERn(tab));
+               if (__SHIFTOUT(baser, GITS_BASER_Shareability) == GITS_Shareability_NS) {
+                       baser &= ~GITS_BASER_InnerCache;
+                       baser |= __SHIFTIN(GITS_Cache_NORMAL_NC, GITS_BASER_InnerCache);
+
+                       gits_write_8(its, GITS_BASERn(tab), baser);
+               }
        }
 }