From patchwork Wed Sep 17 16:10:18 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Thompson X-Patchwork-Id: 4925301 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 894989F2EC for ; Wed, 17 Sep 2014 16:12:27 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 5391320179 for ; Wed, 17 Sep 2014 16:13:43 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 281572010F for ; Wed, 17 Sep 2014 16:13:42 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XUHpP-0005KM-RJ; Wed, 17 Sep 2014 16:11:35 +0000 Received: from mail-pa0-f43.google.com ([209.85.220.43]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XUHof-0004aN-De for linux-arm-kernel@lists.infradead.org; Wed, 17 Sep 2014 16:10:50 +0000 Received: by mail-pa0-f43.google.com with SMTP id fa1so2510550pad.2 for ; Wed, 17 Sep 2014 09:10:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=9tC8tvG7ca6ffCBOwY/8TEbqxKW5mv9noX3sayeZ6KQ=; b=VJ292xhoKVzPgXDswBBjRTDgbPaZpaaEZoaV/jWNvNWAWNIeH6Tr/fGyEeQSXnN3xd QfrapQpSO2QVSRSxlqNdtwUeNy+EvJVpmhTG+CXpAgz6fZZ1z/76VxXbnci7udauMOie ucUDfvKyfMUxjl78oNvZjKT5sMdcusW8P87EMZodGOmAOzVWhVygtCgxCyQ3Hm/nlHyy VsILci6MtSOgBCjrdsQQIpPdGMxJFaORCUWA3C/nzv0JPD7H1qamjc3n/uQ7aCuvkeyp bjWRWJSANnNrUDcxnoYFoIxIHUoX+7quX6onZrCOUpHfnStnywWQv83Upe1u/7Uk+9Vb ipEA== X-Gm-Message-State: ALoCoQnxe0xXq/5jYLVTclKYSNM/I3RpU5NG6QdPbcN3ISjqCVgm0BaMRdWYtBZp2oDlX/p9Nk2G X-Received: by 10.66.66.229 with SMTP id i5mr26433667pat.131.1410970229325; Wed, 17 Sep 2014 09:10:29 -0700 (PDT) Received: from harvey.bri.st.com ([38.126.120.10]) by mx.google.com with ESMTPSA id pd7sm17841758pac.33.2014.09.17.09.10.28 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 17 Sep 2014 09:10:28 -0700 (PDT) From: Daniel Thompson To: Russell King Subject: [PATCH 3.17-rc4 v7 6/6] arm: smp: Handle ipi_cpu_backtrace() using FIQ (if available) Date: Wed, 17 Sep 2014 09:10:18 -0700 Message-Id: <1410970218-28847-7-git-send-email-daniel.thompson@linaro.org> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1410970218-28847-1-git-send-email-daniel.thompson@linaro.org> References: <1410970218-28847-1-git-send-email-daniel.thompson@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140917_091049_536515_86375404 X-CRM114-Status: GOOD ( 12.19 ) X-Spam-Score: -0.9 (/) Cc: Daniel Thompson , linaro-kernel@lists.linaro.org, patches@linaro.org, linux-kernel@vger.kernel.org, John Stultz , Thomas Gleixner , Sumit Semwal , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Previous changes have introduced a replacement default FIQ handler and an implementation of arch_trigger_all_cpu_backtrace for ARM but these are currently independant. This patch plumbs together these features making it possible, on platforms that support it, to trigger backtrace using FIQ. Signed-off-by: Daniel Thompson --- arch/arm/include/asm/smp.h | 3 +++ arch/arm/kernel/smp.c | 4 +++- arch/arm/kernel/traps.c | 3 +++ 3 files changed, 9 insertions(+), 1 deletion(-) diff --git a/arch/arm/include/asm/smp.h b/arch/arm/include/asm/smp.h index 2ec765c..0580270 100644 --- a/arch/arm/include/asm/smp.h +++ b/arch/arm/include/asm/smp.h @@ -18,6 +18,8 @@ # error " included in non-SMP build" #endif +#define SMP_IPI_FIQ_MASK 0x0100 + #define raw_smp_processor_id() (current_thread_info()->cpu) struct seq_file; @@ -85,6 +87,7 @@ extern void arch_send_call_function_single_ipi(int cpu); extern void arch_send_call_function_ipi_mask(const struct cpumask *mask); extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask); +extern void ipi_cpu_backtrace(struct pt_regs *regs); extern int register_ipi_completion(struct completion *completion, int cpu); struct smp_operations { diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 94959f9..7a79d11 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -543,7 +543,7 @@ static void ipi_cpu_stop(unsigned int cpu) cpu_relax(); } -static void ipi_cpu_backtrace(struct pt_regs *regs) +void ipi_cpu_backtrace(struct pt_regs *regs) { int cpu = smp_processor_id(); @@ -584,6 +584,8 @@ void handle_IPI(int ipinr, struct pt_regs *regs) unsigned int cpu = smp_processor_id(); struct pt_regs *old_regs = set_irq_regs(regs); + BUILD_BUG_ON(SMP_IPI_FIQ_MASK != BIT(IPI_CPU_BACKTRACE)); + if ((unsigned)ipinr < NR_IPI) { trace_ipi_entry(ipi_types[ipinr]); __inc_irq_stat(cpu, ipi_irqs[ipinr]); diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index 92c4ea1..40b1de7 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -483,6 +483,9 @@ asmlinkage void __exception_irq_entry handle_fiq_as_nmi(struct pt_regs *regs) #ifdef CONFIG_ARM_GIC gic_handle_fiq_ipi(); #endif +#ifdef CONFIG_SMP + ipi_cpu_backtrace(regs); +#endif nmi_exit();