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prevent switching to CPUs that are not responding to IPI_DDB.

This commit is contained in:
ryo 2019-09-07 09:27:25 +00:00
parent 8deb94283c
commit a9d5e7d35a
1 changed files with 24 additions and 5 deletions
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29
sys/arch/aarch64/aarch64/db_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: db_machdep.c,v 1.18 2019/09/07 09:21:17 ryo Exp $ */
/* $NetBSD: db_machdep.c,v 1.19 2019/09/07 09:27:25 ryo Exp $ */
/*-
* Copyright (c) 2014 The NetBSD Foundation, Inc.
@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: db_machdep.c,v 1.18 2019/09/07 09:21:17 ryo Exp $");
__KERNEL_RCSID(0, "$NetBSD: db_machdep.c,v 1.19 2019/09/07 09:27:25 ryo Exp $");
#ifdef _KERNEL_OPT
#include "opt_compat_netbsd32.h"
@ -868,24 +868,39 @@ db_md_watch_cmd(db_expr_t addr, bool have_addr, db_expr_t count,
volatile struct cpu_info *db_trigger;
volatile struct cpu_info *db_onproc;
volatile struct cpu_info *db_newcpu;
volatile int db_readytoswitch[MAXCPUS];
#ifdef _KERNEL
void
db_md_switch_cpu_cmd(db_expr_t addr, bool have_addr, db_expr_t count,
const char *modif)
{
struct cpu_info *new_ci = NULL;
u_int cpuno = (u_int)addr;
int i;
if (!have_addr || (cpuno >= ncpu)) {
db_printf("cpu: 0..%d\n", ncpu - 1);
membar_consumer();
if (!have_addr) {
for (i = 0; i < ncpu; i++) {
if (db_readytoswitch[i] != 0)
db_printf("cpu%d: ready\n", i);
else
db_printf("cpu%d: not responding\n", i);
}
return;
}
struct cpu_info *new_ci = cpu_lookup(cpuno);
if (cpuno < ncpu)
new_ci = cpu_lookup(cpuno);
if (new_ci == NULL) {
db_printf("cpu %u does not exist", cpuno);
return;
}
if (db_readytoswitch[new_ci->ci_index] == 0) {
db_printf("cpu %u is not responding", cpuno);
return;
}
if (new_ci == curcpu())
return;
@ -940,6 +955,8 @@ kdb_trap(int type, struct trapframe *tf)
db_trigger = ci;
membar_producer();
}
db_readytoswitch[ci->ci_index] = 1;
membar_producer();
#endif
for (;;) {
@ -993,6 +1010,8 @@ kdb_trap(int type, struct trapframe *tf)
__asm __volatile ("sev; sev; sev");
}
db_trigger = NULL;
db_readytoswitch[ci->ci_index] = 0;
membar_producer();
#endif
return 1;