Module Name: src
Committed By: riastradh
Date: Tue Dec 3 15:21:00 UTC 2019
Modified Files:
src/sys/arch/arm/arm: arm_machdep.c
src/sys/arch/mips/mips: cpu_subr.c
src/sys/arch/sparc/sparc: intr.c
src/sys/arch/sparc64/sparc64: machdep.c
src/sys/arch/usermode/dev: cpu.c
src/sys/arch/x86/x86: pmap.c x86_machdep.c
src/sys/kern: kern_lock.c subr_pool.c
Log Message:
Use __insn_barrier to enforce ordering in l_ncsw loops.
(Only need ordering observable by interruption, not by other CPUs.)
To generate a diff of this commit:
cvs rdiff -u -r1.57 -r1.58 src/sys/arch/arm/arm/arm_machdep.c
cvs rdiff -u -r1.39 -r1.40 src/sys/arch/mips/mips/cpu_subr.c
cvs rdiff -u -r1.122 -r1.123 src/sys/arch/sparc/sparc/intr.c
cvs rdiff -u -r1.294 -r1.295 src/sys/arch/sparc64/sparc64/machdep.c
cvs rdiff -u -r1.82 -r1.83 src/sys/arch/usermode/dev/cpu.c
cvs rdiff -u -r1.341 -r1.342 src/sys/arch/x86/x86/pmap.c
cvs rdiff -u -r1.132 -r1.133 src/sys/arch/x86/x86/x86_machdep.c
cvs rdiff -u -r1.163 -r1.164 src/sys/kern/kern_lock.c
cvs rdiff -u -r1.262 -r1.263 src/sys/kern/subr_pool.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/arch/arm/arm/arm_machdep.c
diff -u src/sys/arch/arm/arm/arm_machdep.c:1.57 src/sys/arch/arm/arm/arm_machdep.c:1.58
--- src/sys/arch/arm/arm/arm_machdep.c:1.57 Sun Dec 1 14:52:13 2019
+++ src/sys/arch/arm/arm/arm_machdep.c Tue Dec 3 15:20:59 2019
@@ -1,4 +1,4 @@
-/* $NetBSD: arm_machdep.c,v 1.57 2019/12/01 14:52:13 ad Exp $ */
+/* $NetBSD: arm_machdep.c,v 1.58 2019/12/03 15:20:59 riastradh Exp $ */
/*
* Copyright (c) 2001 Wasabi Systems, Inc.
@@ -80,7 +80,7 @@
#include <sys/param.h>
-__KERNEL_RCSID(0, "$NetBSD: arm_machdep.c,v 1.57 2019/12/01 14:52:13 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: arm_machdep.c,v 1.58 2019/12/03 15:20:59 riastradh Exp $");
#include <sys/exec.h>
#include <sys/proc.h>
@@ -270,10 +270,12 @@ cpu_intr_p(void)
l = curlwp;
do {
ncsw = l->l_ncsw;
+ __insn_barrier();
idepth = l->l_cpu->ci_intr_depth;
#ifdef __HAVE_PIC_FAST_SOFTINTS
cpl = ci->ci_cpl;
#endif
+ __insn_barrier();
} while (__predict_false(ncsw != l->l_ncsw));
#ifdef __HAVE_PIC_FAST_SOFTINTS
Index: src/sys/arch/mips/mips/cpu_subr.c
diff -u src/sys/arch/mips/mips/cpu_subr.c:1.39 src/sys/arch/mips/mips/cpu_subr.c:1.40
--- src/sys/arch/mips/mips/cpu_subr.c:1.39 Mon Dec 2 23:22:43 2019
+++ src/sys/arch/mips/mips/cpu_subr.c Tue Dec 3 15:20:59 2019
@@ -1,4 +1,4 @@
-/* $NetBSD: cpu_subr.c,v 1.39 2019/12/02 23:22:43 ad Exp $ */
+/* $NetBSD: cpu_subr.c,v 1.40 2019/12/03 15:20:59 riastradh Exp $ */
/*-
* Copyright (c) 2010, 2019 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: cpu_subr.c,v 1.39 2019/12/02 23:22:43 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: cpu_subr.c,v 1.40 2019/12/03 15:20:59 riastradh Exp $");
#include "opt_cputype.h"
#include "opt_ddb.h"
@@ -610,7 +610,9 @@ cpu_intr_p(void)
l = curlwp;
do {
ncsw = l->l_ncsw;
+ __insn_barrier();
idepth = l->l_cpu->ci_idepth;
+ __insn_barrier();
} while (__predict_false(ncsw != l->l_ncsw));
return idepth != 0;
Index: src/sys/arch/sparc/sparc/intr.c
diff -u src/sys/arch/sparc/sparc/intr.c:1.122 src/sys/arch/sparc/sparc/intr.c:1.123
--- src/sys/arch/sparc/sparc/intr.c:1.122 Sun Dec 1 14:52:14 2019
+++ src/sys/arch/sparc/sparc/intr.c Tue Dec 3 15:20:59 2019
@@ -1,4 +1,4 @@
-/* $NetBSD: intr.c,v 1.122 2019/12/01 14:52:14 ad Exp $ */
+/* $NetBSD: intr.c,v 1.123 2019/12/03 15:20:59 riastradh Exp $ */
/*
* Copyright (c) 1992, 1993
@@ -41,7 +41,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: intr.c,v 1.122 2019/12/01 14:52:14 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: intr.c,v 1.123 2019/12/03 15:20:59 riastradh Exp $");
#include "opt_multiprocessor.h"
#include "opt_sparc_arch.h"
@@ -896,7 +896,9 @@ cpu_intr_p(void)
l = curlwp;
do {
ncsw = l->l_ncsw;
+ __insn_barrier();
idepth = l->l_cpu->ci_idepth;
+ __insn_barrier();
} while (__predict_false(ncsw != l->l_ncsw));
return idepth != 0;
Index: src/sys/arch/sparc64/sparc64/machdep.c
diff -u src/sys/arch/sparc64/sparc64/machdep.c:1.294 src/sys/arch/sparc64/sparc64/machdep.c:1.295
--- src/sys/arch/sparc64/sparc64/machdep.c:1.294 Sun Dec 1 14:52:14 2019
+++ src/sys/arch/sparc64/sparc64/machdep.c Tue Dec 3 15:20:59 2019
@@ -1,4 +1,4 @@
-/* $NetBSD: machdep.c,v 1.294 2019/12/01 14:52:14 ad Exp $ */
+/* $NetBSD: machdep.c,v 1.295 2019/12/03 15:20:59 riastradh Exp $ */
/*-
* Copyright (c) 1996, 1997, 1998, 2019 The NetBSD Foundation, Inc.
@@ -71,7 +71,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.294 2019/12/01 14:52:14 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.295 2019/12/03 15:20:59 riastradh Exp $");
#include "opt_ddb.h"
#include "opt_multiprocessor.h"
@@ -2661,7 +2661,9 @@ cpu_intr_p(void)
l = curlwp;
do {
ncsw = l->l_ncsw;
+ __insn_barrier();
idepth = l->l_cpu->ci_idepth;
+ __insn_barrier();
} while (__predict_false(ncsw != l->l_ncsw));
return idepth >= 0;
Index: src/sys/arch/usermode/dev/cpu.c
diff -u src/sys/arch/usermode/dev/cpu.c:1.82 src/sys/arch/usermode/dev/cpu.c:1.83
--- src/sys/arch/usermode/dev/cpu.c:1.82 Sun Dec 1 14:52:14 2019
+++ src/sys/arch/usermode/dev/cpu.c Tue Dec 3 15:20:59 2019
@@ -1,4 +1,4 @@
-/* $NetBSD: cpu.c,v 1.82 2019/12/01 14:52:14 ad Exp $ */
+/* $NetBSD: cpu.c,v 1.83 2019/12/03 15:20:59 riastradh Exp $ */
/*-
* Copyright (c) 2007 Jared D. McNeill <[email protected]>
@@ -30,7 +30,7 @@
#include "opt_hz.h"
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: cpu.c,v 1.82 2019/12/01 14:52:14 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: cpu.c,v 1.83 2019/12/03 15:20:59 riastradh Exp $");
#include <sys/param.h>
#include <sys/conf.h>
@@ -535,7 +535,9 @@ cpu_intr_p(void)
l = curlwp;
do {
ncsw = l->l_ncsw;
+ __insn_barrier();
idepth = l->l_cpu->ci_idepth;
+ __insn_barrier();
} while (__predict_false(ncsw != l->l_ncsw));
return idepth >= 0;
Index: src/sys/arch/x86/x86/pmap.c
diff -u src/sys/arch/x86/x86/pmap.c:1.341 src/sys/arch/x86/x86/pmap.c:1.342
--- src/sys/arch/x86/x86/pmap.c:1.341 Sat Nov 16 10:19:29 2019
+++ src/sys/arch/x86/x86/pmap.c Tue Dec 3 15:20:59 2019
@@ -1,4 +1,4 @@
-/* $NetBSD: pmap.c,v 1.341 2019/11/16 10:19:29 maxv Exp $ */
+/* $NetBSD: pmap.c,v 1.342 2019/12/03 15:20:59 riastradh Exp $ */
/*
* Copyright (c) 2008, 2010, 2016, 2017 The NetBSD Foundation, Inc.
@@ -130,7 +130,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.341 2019/11/16 10:19:29 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.342 2019/12/03 15:20:59 riastradh Exp $");
#include "opt_user_ldt.h"
#include "opt_lockdebug.h"
@@ -2893,6 +2893,7 @@ pmap_load(void)
}
l = ci->ci_curlwp;
ncsw = l->l_ncsw;
+ __insn_barrier();
/* should be able to take ipis. */
KASSERT(ci->ci_ilevel < IPL_HIGH);
@@ -2974,6 +2975,7 @@ pmap_load(void)
*/
pmap_destroy(oldpmap);
+ __insn_barrier();
if (l->l_ncsw != ncsw) {
goto retry;
}
Index: src/sys/arch/x86/x86/x86_machdep.c
diff -u src/sys/arch/x86/x86/x86_machdep.c:1.132 src/sys/arch/x86/x86/x86_machdep.c:1.133
--- src/sys/arch/x86/x86/x86_machdep.c:1.132 Tue Dec 3 11:50:45 2019
+++ src/sys/arch/x86/x86/x86_machdep.c Tue Dec 3 15:20:59 2019
@@ -1,4 +1,4 @@
-/* $NetBSD: x86_machdep.c,v 1.132 2019/12/03 11:50:45 hannken Exp $ */
+/* $NetBSD: x86_machdep.c,v 1.133 2019/12/03 15:20:59 riastradh Exp $ */
/*-
* Copyright (c) 2002, 2006, 2007 YAMAMOTO Takashi,
@@ -31,7 +31,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: x86_machdep.c,v 1.132 2019/12/03 11:50:45 hannken Exp $");
+__KERNEL_RCSID(0, "$NetBSD: x86_machdep.c,v 1.133 2019/12/03 15:20:59 riastradh Exp $");
#include "opt_modular.h"
#include "opt_physmem.h"
@@ -350,7 +350,7 @@ bool
cpu_intr_p(void)
{
uint64_t ncsw;
- volatile int idepth;
+ int idepth;
lwp_t *l;
l = curlwp;
@@ -360,7 +360,9 @@ cpu_intr_p(void)
}
do {
ncsw = l->l_ncsw;
+ __insn_barrier();
idepth = l->l_cpu->ci_idepth;
+ __insn_barrier();
} while (__predict_false(ncsw != l->l_ncsw));
return idepth >= 0;
Index: src/sys/kern/kern_lock.c
diff -u src/sys/kern/kern_lock.c:1.163 src/sys/kern/kern_lock.c:1.164
--- src/sys/kern/kern_lock.c:1.163 Thu May 9 05:00:31 2019
+++ src/sys/kern/kern_lock.c Tue Dec 3 15:20:59 2019
@@ -1,4 +1,4 @@
-/* $NetBSD: kern_lock.c,v 1.163 2019/05/09 05:00:31 ozaki-r Exp $ */
+/* $NetBSD: kern_lock.c,v 1.164 2019/12/03 15:20:59 riastradh Exp $ */
/*-
* Copyright (c) 2002, 2006, 2007, 2008, 2009 The NetBSD Foundation, Inc.
@@ -31,7 +31,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_lock.c,v 1.163 2019/05/09 05:00:31 ozaki-r Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_lock.c,v 1.164 2019/12/03 15:20:59 riastradh Exp $");
#include <sys/param.h>
#include <sys/proc.h>
@@ -75,7 +75,9 @@ assert_sleepable(void)
*/
do {
pctr = lwp_pctr();
+ __insn_barrier();
idle = CURCPU_IDLE_P();
+ __insn_barrier();
} while (pctr != lwp_pctr());
reason = NULL;
Index: src/sys/kern/subr_pool.c
diff -u src/sys/kern/subr_pool.c:1.262 src/sys/kern/subr_pool.c:1.263
--- src/sys/kern/subr_pool.c:1.262 Thu Nov 14 16:23:53 2019
+++ src/sys/kern/subr_pool.c Tue Dec 3 15:20:59 2019
@@ -1,4 +1,4 @@
-/* $NetBSD: subr_pool.c,v 1.262 2019/11/14 16:23:53 maxv Exp $ */
+/* $NetBSD: subr_pool.c,v 1.263 2019/12/03 15:20:59 riastradh Exp $ */
/*
* Copyright (c) 1997, 1999, 2000, 2002, 2007, 2008, 2010, 2014, 2015, 2018
@@ -33,7 +33,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: subr_pool.c,v 1.262 2019/11/14 16:23:53 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: subr_pool.c,v 1.263 2019/12/03 15:20:59 riastradh Exp $");
#ifdef _KERNEL_OPT
#include "opt_ddb.h"
@@ -2460,6 +2460,7 @@ pool_cache_get_slow(pool_cache_cpu_t *cc
*/
if (__predict_false(!mutex_tryenter(&pc->pc_lock))) {
ncsw = curlwp->l_ncsw;
+ __insn_barrier();
mutex_enter(&pc->pc_lock);
pc->pc_contended++;
@@ -2468,6 +2469,7 @@ pool_cache_get_slow(pool_cache_cpu_t *cc
* our view of the per-CPU data is invalid:
* retry.
*/
+ __insn_barrier();
if (curlwp->l_ncsw != ncsw) {
mutex_exit(&pc->pc_lock);
return true;
@@ -2625,6 +2627,7 @@ pool_cache_put_slow(pool_cache_cpu_t *cc
pcg = NULL;
cc->cc_misses++;
ncsw = l->l_ncsw;
+ __insn_barrier();
/*
* If there are no empty groups in the cache then allocate one
@@ -2638,6 +2641,7 @@ pool_cache_put_slow(pool_cache_cpu_t *cc
* If pool_get() blocked, then our view of
* the per-CPU data is invalid: retry.
*/
+ __insn_barrier();
if (__predict_false(l->l_ncsw != ncsw)) {
if (pcg != NULL) {
pool_put(pc->pc_pcgpool, pcg);
@@ -2659,6 +2663,7 @@ pool_cache_put_slow(pool_cache_cpu_t *cc
* If we context switched while locking, then our view of
* the per-CPU data is invalid: retry.
*/
+ __insn_barrier();
if (__predict_false(l->l_ncsw != ncsw)) {
mutex_exit(&pc->pc_lock);
if (pcg != NULL) {
