From patchwork Fri Nov 28 16:16:14 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Thompson X-Patchwork-Id: 5404901 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 2AB09BEEA8 for ; Fri, 28 Nov 2014 16:21:24 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 4087F2013A for ; Fri, 28 Nov 2014 16:21:23 +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 6E52B2016C for ; Fri, 28 Nov 2014 16:21:22 +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 1XuOGL-0007Rw-6y; Fri, 28 Nov 2014 16:19:17 +0000 Received: from mail-wg0-f49.google.com ([74.125.82.49]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XuOES-0006ZH-7q for linux-arm-kernel@lists.infradead.org; Fri, 28 Nov 2014 16:17:21 +0000 Received: by mail-wg0-f49.google.com with SMTP id n12so972561wgh.36 for ; Fri, 28 Nov 2014 08:16:58 -0800 (PST) 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=DgDi6pdiRE8xxlXMH2+tk85Fjj57DmPow/ZhalaO1mE=; b=BOmXYwD/tBb1s7hU2ZVbm8SF8wq2b+XBF+uNCMDcKoYHWGcHDWp5B7knI6l0fC9JQH zLKQYri7K32NVbkS1TTyvnDxCWNG5cudrCnVgsRmntC1dvgLzcqKsasxYy+20v1wwmgh dtwPrE7hx6BbIX6UliywGgAXK0P7k6xBVbWkhp71sfdltI3n5/rqLR36njnVlJhZlDGT dx7CzWAKUMQf8IplmPZybdfEnq8WAZJweZCgLC3scwxgDmtWHZwZdtWURw/kaByNo+Qx wu4M/V+llYSPBCpsL1c+xSEbOzlMmdemymDY3JzIQRwdwFlLP3P3hw7BAighUbGkn+6L JHig== X-Gm-Message-State: ALoCoQkA8mantez8R50jLNhkcctKdbO23VApAvfTu0fO4B4f+4nVBkcVWV5DR3y2OqcCRYobawSw X-Received: by 10.194.190.19 with SMTP id gm19mr70465032wjc.51.1417191418445; Fri, 28 Nov 2014 08:16:58 -0800 (PST) Received: from sundance.lan (cpc4-aztw19-0-0-cust157.18-1.cable.virginm.net. [82.33.25.158]) by mx.google.com with ESMTPSA id js5sm29576588wid.11.2014.11.28.08.16.56 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 28 Nov 2014 08:16:57 -0800 (PST) From: Daniel Thompson To: Thomas Gleixner , Jason Cooper Subject: [PATCH 3.18-rc4 v12 5/5] arm: smp: Handle ipi_cpu_backtrace() using FIQ (if available) Date: Fri, 28 Nov 2014 16:16:14 +0000 Message-Id: <1417191374-26719-6-git-send-email-daniel.thompson@linaro.org> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1417191374-26719-1-git-send-email-daniel.thompson@linaro.org> References: <1415968543-29469-1-git-send-email-daniel.thompson@linaro.org> <1417191374-26719-1-git-send-email-daniel.thompson@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20141128_081720_477365_9464E3BD X-CRM114-Status: GOOD ( 12.01 ) X-Spam-Score: -0.7 (/) Cc: Daniel Thompson , linaro-kernel@lists.linaro.org, Russell King , patches@linaro.org, Stephen Boyd , linux-kernel@vger.kernel.org, Daniel Drake , Dmitry Pervushin , Dirk Behme , John Stultz , Tim Sander , 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_LOW, T_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 both a replacement default FIQ handler and an implementation of arch_trigger_all_cpu_backtrace for ARM but these are currently independent of each other. 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 18f5a554134f..b076584ac0fa 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; @@ -79,6 +81,7 @@ 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 14c594a12bef..e923843562d9 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -539,7 +539,7 @@ 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(); @@ -580,6 +580,8 @@ 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 4dc45b38e56e..9eb05be9526e 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();