From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755970AbcKJWnt (ORCPT ); Thu, 10 Nov 2016 17:43:49 -0500 Received: from userp1040.oracle.com ([156.151.31.81]:44749 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934434AbcKJWnq (ORCPT ); Thu, 10 Nov 2016 17:43:46 -0500 From: Vijay Kumar To: davem@davemloft.net, sparclinux@vger.kernel.org Cc: karl.volz@oracle.com, rob.gardner@oracle.com, linux-kernel@vger.kernel.org Subject: [PATCH 2/4] sparc64: Migrate hvcons irq to panicked cpu Date: Thu, 10 Nov 2016 14:43:34 -0800 Message-Id: <1478817816-98939-2-git-send-email-vijay.ac.kumar@oracle.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1478817816-98939-1-git-send-email-vijay.ac.kumar@oracle.com> References: <1478817816-98939-1-git-send-email-vijay.ac.kumar@oracle.com> X-Source-IP: userv0022.oracle.com [156.151.31.74] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On panic, all other CPUs are stopped except the one which had hit panic. To keep console alive, we need to migrate hvcons irq to panicked CPU. Signed-off-by: Vijay Kumar --- arch/sparc/include/asm/setup.h | 1 + arch/sparc/kernel/smp_64.c | 6 +++++- drivers/tty/serial/sunhv.c | 6 ++++++ 3 files changed, 12 insertions(+), 1 deletions(-) diff --git a/arch/sparc/include/asm/setup.h b/arch/sparc/include/asm/setup.h index 29d64b1..41691a5 100644 --- a/arch/sparc/include/asm/setup.h +++ b/arch/sparc/include/asm/setup.h @@ -61,6 +61,7 @@ extern atomic_t dcpage_flushes_xcall; extern int sysctl_tsb_ratio; #endif +void sunhv_migrate_hvcons_irq(int cpu); void sun_do_break(void); extern int stop_a_enabled; extern int scons_pwroff; diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c index 14138ad..52dc4b7 100644 --- a/arch/sparc/kernel/smp_64.c +++ b/arch/sparc/kernel/smp_64.c @@ -1444,8 +1444,12 @@ void smp_send_stop(void) int cpu; if (tlb_type == hypervisor) { + int this_cpu = smp_processor_id(); + + sunhv_migrate_hvcons_irq(this_cpu); + for_each_online_cpu(cpu) { - if (cpu == smp_processor_id()) + if (cpu == this_cpu) continue; set_cpu_online(cpu, false); diff --git a/drivers/tty/serial/sunhv.c b/drivers/tty/serial/sunhv.c index 4e603d0..59828d8 100644 --- a/drivers/tty/serial/sunhv.c +++ b/drivers/tty/serial/sunhv.c @@ -398,6 +398,12 @@ static struct uart_driver sunhv_reg = { static struct uart_port *sunhv_port; +void sunhv_migrate_hvcons_irq(int cpu) +{ + /* Migrate hvcons irq to param cpu */ + irq_force_affinity(sunhv_port->irq, cpumask_of(cpu)); +} + /* Copy 's' into the con_write_page, decoding "\n" into * "\r\n" along the way. We have to return two lengths * because the caller needs to know how much to advance -- 1.7.1