Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757104Ab3JRSyO (ORCPT ); Fri, 18 Oct 2013 14:54:14 -0400 Received: from relay1.sgi.com ([192.48.179.29]:36541 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756800Ab3JRSxh (ORCPT ); Fri, 18 Oct 2013 14:53:37 -0400 Message-Id: <20131018185334.819508479@asylum.americas.sgi.com> References: <20131018185334.272062791@asylum.americas.sgi.com> User-Agent: quilt/0.46-1 Date: Fri, 18 Oct 2013 13:53:37 -0500 From: Mike Travis To: Ingo Molnar , Jason Wessel , Peter Zijlstra , Paul Mackerras , Arnaldo Carvalho de Melo , "H. Peter Anvin" , Thomas Gleixner , Andrew Morton Cc: Hedi Berriche , x86@kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 3/3] PATCH: UV/NMI/KGDB/KDB Fix UV NMI handler when KDB not configed. Content-Disposition: inline; filename=uv-fix-use-kgdb.patch Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3927 Lines: 118 Fix UV call into kgdb to depend only on whether KGDB is defined and not both KGDB and KDB. This allows the power nmi command to use the gdb remote connection if enabled. Note new action of 'kgdb' needs to be set as well to indicate user wants to wait for gdb to be connected. If it's set to 'kdb' then an error message is displayed if KDB is not configured. Note that if both KGDB and KDB are enabled, then the action of 'kgdb' or 'kdb' has no affect on which is used. See the KGDB documention for further information. Signed-off-by: Mike Travis Reviewed-by: Hedi Berriche --- arch/x86/platform/uv/uv_nmi.c | 57 +++++++++++++++++++++++++++++++----------- 1 file changed, 43 insertions(+), 14 deletions(-) --- linux.orig/arch/x86/platform/uv/uv_nmi.c +++ linux/arch/x86/platform/uv/uv_nmi.c @@ -155,7 +155,8 @@ module_param_named(retry_count, uv_nmi_r * "dump" - dump process stack for each cpu * "ips" - dump IP info for each cpu * "kdump" - do crash dump - * "kdb" - enter KDB/KGDB (default) + * "kdb" - enter KDB (default) + * "kgdb" - enter KGDB */ static char uv_nmi_action[8] = "kdb"; module_param_string(action, uv_nmi_action, sizeof(uv_nmi_action), 0644); @@ -544,18 +545,46 @@ static inline void uv_nmi_kdump(int cpu, } #endif /* !CONFIG_KEXEC */ +#ifdef CONFIG_KGDB #ifdef CONFIG_KGDB_KDB -/* Call KDB from NMI handler */ -static void uv_call_kdb(int cpu, struct pt_regs *regs, int master) +static inline int uv_nmi_kgdb_reason(void) { - int ret; + if (uv_nmi_action_is("kdb")) + return KDB_REASON_SYSTEM_NMI; + return 0; +} +#else /* !CONFIG_KGDB_KDB */ +static inline int uv_nmi_kgdb_reason(void) +{ + if (uv_nmi_action_is("kgdb")) + return 0; + pr_err("UV: NMI error: KDB is not enabled in this kernel\n"); + return -1; +} +#endif /* CONFIG_KGDB_KDB */ + +/* + * Call KGDB/KDB from NMI handler + * + * Note that if both KGDB and KDB are configured, then the action of 'kgdb' or + * 'kdb' has no affect on which is used. See the KGDB documention for further + * information. + */ +static void uv_call_kgdb_kdb(int cpu, struct pt_regs *regs, int master) +{ if (master) { + int reason = uv_nmi_kgdb_reason(); + int ret; + + if (reason < 0) + return; + /* call KGDB NMI handler as MASTER */ - ret = kgdb_nmicallin(cpu, X86_TRAP_NMI, regs, - KDB_REASON_SYSTEM_NMI, &uv_nmi_slave_continue); + ret = kgdb_nmicallin(cpu, X86_TRAP_NMI, regs, reason, + &uv_nmi_slave_continue); if (ret) { - pr_alert("KDB returned error, is kgdboc set?\n"); + pr_alert("KGDB returned error, is kgdboc set?\n"); atomic_set(&uv_nmi_slave_continue, SLAVE_EXIT); } } else { @@ -574,12 +603,12 @@ static void uv_call_kdb(int cpu, struct uv_nmi_sync_exit(master); } -#else /* !CONFIG_KGDB_KDB */ -static inline void uv_call_kdb(int cpu, struct pt_regs *regs, int master) +#else /* !CONFIG_KGDB */ +static inline void uv_call_kgdb_kdb(int cpu, struct pt_regs *regs, int master) { - pr_err("UV: NMI error: KGDB/KDB is not enabled in this kernel\n"); + pr_err("UV: NMI error: KGDB is not enabled in this kernel\n"); } -#endif /* !CONFIG_KGDB_KDB */ +#endif /* !CONFIG_KGDB */ /* * UV NMI handler @@ -617,9 +646,9 @@ int uv_handle_nmi(unsigned int reason, s if (uv_nmi_action_is("ips") || uv_nmi_action_is("dump")) uv_nmi_dump_state(cpu, regs, master); - /* Call KDB if enabled */ - else if (uv_nmi_action_is("kdb")) - uv_call_kdb(cpu, regs, master); + /* Call KGDB/KDB if enabled */ + else if (uv_nmi_action_is("kdb") || uv_nmi_action_is("kgdb")) + uv_call_kgdb_kdb(cpu, regs, master); /* Clear per_cpu "in nmi" flag */ atomic_set(&uv_cpu_nmi.state, UV_NMI_STATE_OUT); -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/