From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754124Ab1CYTjC (ORCPT ); Fri, 25 Mar 2011 15:39:02 -0400 Received: from mail3.caviumnetworks.com ([12.108.191.235]:19555 "EHLO mail3.caviumnetworks.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753023Ab1CYTjA (ORCPT ); Fri, 25 Mar 2011 15:39:00 -0400 From: David Daney To: tglx@linutronix.de, linux-mips@linux-mips.org, ralf@linux-mips.org Cc: linux-kernel@vger.kernel.org, David Daney Subject: [PATCH v3 0/4] Add IRQ chip hooks for taking CPUs on/off line. Date: Fri, 25 Mar 2011 12:38:47 -0700 Message-Id: <1301081931-11240-1-git-send-email-ddaney@caviumnetworks.com> X-Mailer: git-send-email 1.7.2.3 X-OriginalArrivalTime: 25 Mar 2011 19:38:59.0048 (UTC) FILETIME=[49401E80:01CBEB24] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When a CPU is brought on-line, per-CPU interrupts need to be enabled on the new CPU. The local timer and things like perf counters that rely on interrupts don't work if their interrupts are not enabled. Likewise when a CPU is taken off-line, we may need to clean up the interrupts. I solve both of these problems by adding a pair of function pointers to the irq_chip structure, along with some simple helper functions to call them. There are a pair of helper functions, irq_cpu_{on,off}line(), iterate through all irqs calling the chip.irq_cpu_{on,off}line() for each irq. For this iteration to work, we must make sure that all active irqs are in the allocated_irqs set. To do this we call irq_reserve_irq() from irq_set_chip(). My chip.irq_cpu_offline() need to adjust the affinity of some irqs, so I split up irq_set_affinity() in to two parts, one of which I can call with the irq desc lock held. Finally I completely rewrite my irq handling code which uses the changes to the core irq code. David Daney (4): genirq: Reserve the irq when calling irq_set_chip() genirq: Add chip hooks for taking CPUs on/off line. genirq: Split irq_set_affinity() so it can be called with lock held. MIPS: Octeon: Rewrite interrupt handling code. arch/mips/cavium-octeon/octeon-irq.c | 1423 ++++++++++++++---------- arch/mips/cavium-octeon/setup.c | 12 - arch/mips/cavium-octeon/smp.c | 39 +- arch/mips/include/asm/mach-cavium-octeon/irq.h | 243 ++--- arch/mips/include/asm/octeon/octeon.h | 2 + arch/mips/pci/msi-octeon.c | 20 +- include/linux/interrupt.h | 2 + include/linux/irq.h | 8 + kernel/irq/chip.c | 68 ++ kernel/irq/manage.c | 40 +- 10 files changed, 1026 insertions(+), 831 deletions(-) -- 1.7.2.3