From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932330Ab1BJXiM (ORCPT ); Thu, 10 Feb 2011 18:38:12 -0500 Received: from www.tglx.de ([62.245.132.106]:44415 "EHLO www.tglx.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932305Ab1BJXiH (ORCPT ); Thu, 10 Feb 2011 18:38:07 -0500 Message-Id: <20110210223259.609792276@linutronix.de> User-Agent: quilt/0.48-1 Date: Thu, 10 Feb 2011 23:37:59 -0000 From: Thomas Gleixner To: LKML Cc: Ingo Molnar , Peter Zijlstra Subject: [patch 55/75] genirq: Mirror IRQ_PER_CPU and IRQ_NO_BALANCING in irq_data.state References: <20110210222908.661199947@linutronix.de> Content-Disposition: inline; filename=genirq-mirror-percpu-in-irq-data-state.patch Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org That's the right data structure to look at for arch code. Accessor functions are provided. irqd_is_per_cpu(irqdata); irqd_can_balance(irqdata); Coders who access them directly will be tracked down and slapped with stinking trouts. Signed-off-by: Thomas Gleixner --- include/linux/irq.h | 16 +++++++++++++++- kernel/irq/chip.c | 15 +++++++++------ kernel/irq/internals.h | 11 +++++++++++ kernel/irq/manage.c | 16 ++++++++++------ kernel/irq/migration.c | 2 +- kernel/irq/settings.h | 36 ++++++++++++++++++++++++++++++++++++ kernel/irq/spurious.c | 3 ++- 7 files changed, 84 insertions(+), 15 deletions(-) Index: linux-2.6-tip/include/linux/irq.h =================================================================== --- linux-2.6-tip.orig/include/linux/irq.h +++ linux-2.6-tip/include/linux/irq.h @@ -130,10 +130,14 @@ struct irq_data { * Bit masks for irq_data.state * * IRQD_SETAFFINITY_PENDING - Affinity setting is pending + * IRQD_NO_BALANCING - Balancing disabled for this IRQ + * IRQD_PER_CPU - Interrupt is per cpu */ enum { /* Bit 0 - 7 reserved for TYPE will use later */ - IRQD_SETAFFINITY_PENDING = (1 << 8), + IRQD_SETAFFINITY_PENDING = (1 << 8), + IRQD_NO_BALANCING = (1 << 10), + IRQD_PER_CPU = (1 << 11), }; static inline bool irqd_is_setaffinity_pending(struct irq_data *d) @@ -141,6 +145,16 @@ static inline bool irqd_is_setaffinity_p return d->state_use_accessors & IRQD_SETAFFINITY_PENDING; } +static inline bool irqd_is_per_cpu(struct irq_data *d) +{ + return d->state_use_accessors & IRQD_PER_CPU; +} + +static inline bool irqd_can_balance(struct irq_data *d) +{ + return !(d->state_use_accessors & (IRQD_PER_CPU | IRQD_NO_BALANCING)); +} + /** * struct irq_chip - hardware interrupt chip descriptor * Index: linux-2.6-tip/kernel/irq/chip.c =================================================================== --- linux-2.6-tip.orig/kernel/irq/chip.c +++ linux-2.6-tip/kernel/irq/chip.c @@ -732,12 +732,15 @@ void irq_modify_status(unsigned int irq, if (!desc) return; - /* Sanitize flags */ - set &= IRQF_MODIFY_MASK; - clr &= IRQF_MODIFY_MASK; - raw_spin_lock_irqsave(&desc->lock, flags); - desc->status &= ~clr; - desc->status |= set; + + irq_settings_clr_and_set(desc, clr, set); + + irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU); + if (irq_settings_has_no_balance_set(desc)) + irqd_set(&desc->irq_data, IRQD_NO_BALANCING); + if (irq_settings_is_per_cpu(desc)) + irqd_set(&desc->irq_data, IRQD_PER_CPU); + raw_spin_unlock_irqrestore(&desc->lock, flags); } Index: linux-2.6-tip/kernel/irq/internals.h =================================================================== --- linux-2.6-tip.orig/kernel/irq/internals.h +++ linux-2.6-tip/kernel/irq/internals.h @@ -137,3 +137,14 @@ static inline void irqd_clr_move_pending d->state_use_accessors &= ~IRQD_SETAFFINITY_PENDING; irq_compat_clr_move_pending(irq_data_to_desc(d)); } + +static inline void irqd_clear(struct irq_data *d, unsigned int mask) +{ + d->state_use_accessors &= ~mask; +} + +static inline void irqd_set(struct irq_data *d, unsigned int mask) +{ + d->state_use_accessors |= mask; +} + Index: linux-2.6-tip/kernel/irq/manage.c =================================================================== --- linux-2.6-tip.orig/kernel/irq/manage.c +++ linux-2.6-tip/kernel/irq/manage.c @@ -73,8 +73,8 @@ int irq_can_set_affinity(unsigned int ir { struct irq_desc *desc = irq_to_desc(irq); - if ((desc->status & (IRQ_PER_CPU | IRQ_NO_BALANCING)) || - !desc->irq_data.chip || !desc->irq_data.chip->irq_set_affinity) + if (!irqd_can_balance(&desc->irq_data) || !desc->irq_data.chip || + !desc->irq_data.chip->irq_set_affinity) return 0; return 1; @@ -903,8 +903,10 @@ __setup_irq(unsigned int irq, struct irq IRQS_INPROGRESS | IRQS_ONESHOT | \ IRQS_WAITING); - if (new->flags & IRQF_PERCPU) - desc->status |= IRQ_PER_CPU; + if (new->flags & IRQF_PERCPU) { + irqd_set(&desc->irq_data, IRQD_PER_CPU); + irq_settings_set_per_cpu(desc); + } if (new->flags & IRQF_ONESHOT) desc->istate |= IRQS_ONESHOT; @@ -916,8 +918,10 @@ __setup_irq(unsigned int irq, struct irq desc->depth = 1; /* Exclude IRQ from balancing if requested */ - if (new->flags & IRQF_NOBALANCING) - desc->status |= IRQ_NO_BALANCING; + if (new->flags & IRQF_NOBALANCING) { + irq_settings_set_no_balancing(desc); + irqd_set(&desc->irq_data, IRQD_NO_BALANCING); + } /* Set default affinity mask once everything is setup */ setup_affinity(irq, desc, mask); Index: linux-2.6-tip/kernel/irq/migration.c =================================================================== --- linux-2.6-tip.orig/kernel/irq/migration.c +++ linux-2.6-tip/kernel/irq/migration.c @@ -15,7 +15,7 @@ void move_masked_irq(int irq) /* * Paranoia: cpu-local interrupts shouldn't be calling in here anyway. */ - if (desc->status & (IRQ_PER_CPU | IRQ_NO_BALANCING)) { + if (!irqd_can_balance(&desc->irq_data)) { WARN_ON(1); return; } Index: linux-2.6-tip/kernel/irq/settings.h =================================================================== --- linux-2.6-tip.orig/kernel/irq/settings.h +++ linux-2.6-tip/kernel/irq/settings.h @@ -4,6 +4,9 @@ */ enum { _IRQ_DEFAULT_INIT_FLAGS = IRQ_DEFAULT_INIT_FLAGS, + _IRQ_PER_CPU = IRQ_PER_CPU, + _IRQ_NO_BALANCING = IRQ_NO_BALANCING, + _IRQF_MODIFY_MASK = IRQF_MODIFY_MASK, }; #undef IRQ_INPROGRESS @@ -22,3 +25,36 @@ enum { #define IRQ_WAKEUP GOT_YOU_MORON #undef IRQ_MOVE_PENDING #define IRQ_MOVE_PENDING GOT_YOU_MORON +#undef IRQ_PER_CPU +#define IRQ_PER_CPU GOT_YOU_MORON +#undef IRQ_NO_BALANCING +#define IRQ_NO_BALANCING GOT_YOU_MORON +#undef IRQF_MODIFY_MASK +#define IRQF_MODIFY_MASK GOT_YOU_MORON + +static inline void +irq_settings_clr_and_set(struct irq_desc *desc, u32 clr, u32 set) +{ + desc->status &= ~(clr & _IRQF_MODIFY_MASK); + desc->status |= (set & _IRQF_MODIFY_MASK); +} + +static inline bool irq_settings_is_per_cpu(struct irq_desc *desc) +{ + return desc->status & _IRQ_PER_CPU; +} + +static inline void irq_settings_set_per_cpu(struct irq_desc *desc) +{ + desc->status |= _IRQ_PER_CPU; +} + +static inline void irq_settings_set_no_balancing(struct irq_desc *desc) +{ + desc->status |= _IRQ_NO_BALANCING; +} + +static inline bool irq_settings_has_no_balance_set(struct irq_desc *desc) +{ + return desc->status & _IRQ_NO_BALANCING; +} Index: linux-2.6-tip/kernel/irq/spurious.c =================================================================== --- linux-2.6-tip.orig/kernel/irq/spurious.c +++ linux-2.6-tip/kernel/irq/spurious.c @@ -68,7 +68,8 @@ static int try_one_irq(int irq, struct i raw_spin_lock(&desc->lock); /* PER_CPU and nested thread interrupts are never polled */ - if ((desc->status & IRQ_PER_CPU) || (desc->istate & IRQS_NESTED_THREAD)) + if (irq_settings_is_per_cpu(desc) || + (desc->istate & IRQS_NESTED_THREAD)) goto out; /*