From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757447Ab1CYBG7 (ORCPT ); Thu, 24 Mar 2011 21:06:59 -0400 Received: from mail3.caviumnetworks.com ([12.108.191.235]:11486 "EHLO mail3.caviumnetworks.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755356Ab1CYBGy (ORCPT ); Thu, 24 Mar 2011 21:06:54 -0400 From: David Daney To: tglx@linutronix.de, linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org, David Daney Subject: [PATCH v2 1/3] genirq: Add chip hooks for taking CPUs on/off line. Date: Thu, 24 Mar 2011 18:06:36 -0700 Message-Id: <1301015198-25535-2-git-send-email-ddaney@caviumnetworks.com> X-Mailer: git-send-email 1.7.2.3 In-Reply-To: <1301015198-25535-1-git-send-email-ddaney@caviumnetworks.com> References: <1301015198-25535-1-git-send-email-ddaney@caviumnetworks.com> X-OriginalArrivalTime: 25 Mar 2011 01:06:54.0358 (UTC) FILETIME=[EE3C6B60:01CBEA88] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: David Daney --- include/linux/irq.h | 8 ++++++ kernel/irq/chip.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 70 insertions(+), 0 deletions(-) diff --git a/include/linux/irq.h b/include/linux/irq.h index 1d3577f..f517b25 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -270,6 +270,8 @@ static inline bool irqd_can_move_in_process_context(struct irq_data *d) * @irq_set_wake: enable/disable power-management wake-on of an IRQ * @irq_bus_lock: function to lock access to slow bus (i2c) chips * @irq_bus_sync_unlock:function to sync and unlock slow bus (i2c) chips + * @irq_cpu_online: configure an interrupt source for a secondary CPU + * @irq_cpu_offline: un-configure an interrupt source for a secondary CPU * @flags: chip specific flags * * @release: release function solely used by UML @@ -317,6 +319,9 @@ struct irq_chip { void (*irq_bus_lock)(struct irq_data *data); void (*irq_bus_sync_unlock)(struct irq_data *data); + void (*irq_cpu_online)(struct irq_data *data, bool enabled); + void (*irq_cpu_offline)(struct irq_data *data, bool enabled); + unsigned long flags; /* Currently used only by UML, might disappear one day.*/ @@ -360,6 +365,9 @@ struct irqaction; extern int setup_irq(unsigned int irq, struct irqaction *new); extern void remove_irq(unsigned int irq, struct irqaction *act); +extern void irq_cpu_online(void); +extern void irq_cpu_offline(void); + #ifdef CONFIG_GENERIC_HARDIRQS #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_PENDING_IRQ) diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index c9c0601..d122acb 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -689,3 +689,65 @@ void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set) irq_put_desc_unlock(desc, flags); } + +/** + * irq_cpu_online - Invoke all irq_cpu_online functions. + * + * Iterate through all irqs and invoke the chip.irq_cpu_online() + * for each. + */ +void irq_cpu_online(void) +{ + struct irq_desc *desc; + struct irq_chip *chip; + unsigned int irq; + unsigned long flags; + + for (irq = 0; irq < nr_irqs; irq++) { + desc = irq_to_desc(irq); + if (!desc) + continue; + + raw_spin_lock_irqsave(&desc->lock, flags); + + chip = irq_data_get_irq_chip(&desc->irq_data); + + if (chip && chip->irq_cpu_online) { + bool enabled = !(desc->istate & IRQS_DISABLED); + chip->irq_cpu_online(&desc->irq_data, enabled); + } + + raw_spin_unlock_irqrestore(&desc->lock, flags); + } +} + +/** + * irq_cpu_offline - Invoke all irq_cpu_offline functions. + * + * Iterate through all irqs and invoke the chip.irq_cpu_offline() + * for each. + */ +void irq_cpu_offline(void) +{ + struct irq_desc *desc; + struct irq_chip *chip; + unsigned int irq; + unsigned long flags; + + for (irq = 0; irq < nr_irqs; irq++) { + desc = irq_to_desc(irq); + if (!desc) + continue; + + raw_spin_lock_irqsave(&desc->lock, flags); + + chip = irq_data_get_irq_chip(&desc->irq_data); + + if (chip && chip->irq_cpu_offline) { + bool enabled = !(desc->istate & IRQS_DISABLED); + chip->irq_cpu_offline(&desc->irq_data, enabled); + } + + raw_spin_unlock_irqrestore(&desc->lock, flags); + } +} -- 1.7.2.3