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Message-ID: <20081129194158.GA26305@elte.hu>
Date: Sat, 29 Nov 2008 20:41:58 +0100
From: Ingo Molnar <mingo@...e.hu>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>,
Thomas Gleixner <tglx@...utronix.de>
Subject: [git pull] irq fixes
Linus,
Please pull the latest irq-fixes-for-linus git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git irq-fixes-for-linus
Thanks,
Ingo
------------------>
Ingo Molnar (1):
irq: fix typo
Mark Nelson (1):
genirq: __irq_set_trigger: change pr_warning to pr_debug
Randy Dunlap (1):
irq.h: fix missing/extra kernel-doc
Thomas Gleixner (3):
genirq: keep affinities set from userspace across free/request_irq()
genirq: fix the affinity setting in setup_irq
x86: apic honour irq affinity which was set in early boot
arch/x86/kernel/io_apic.c | 26 ++++++++++++++---
include/linux/irq.h | 11 ++-----
kernel/irq/internals.h | 2 +
kernel/irq/manage.c | 68 +++++++++++++++++++++++++++++++++++----------
kernel/irq/migration.c | 11 -------
kernel/irq/proc.c | 2 +-
6 files changed, 80 insertions(+), 40 deletions(-)
diff --git a/arch/x86/kernel/io_apic.c b/arch/x86/kernel/io_apic.c
index c9513e1..8e2ed9c 100644
--- a/arch/x86/kernel/io_apic.c
+++ b/arch/x86/kernel/io_apic.c
@@ -3775,7 +3775,9 @@ int acpi_get_override_irq(int bus_irq, int *trigger, int *polarity)
void __init setup_ioapic_dest(void)
{
int pin, ioapic, irq, irq_entry;
+ struct irq_desc *desc;
struct irq_cfg *cfg;
+ cpumask_t mask;
if (skip_ioapic_setup == 1)
return;
@@ -3792,16 +3794,30 @@ void __init setup_ioapic_dest(void)
* cpu is online.
*/
cfg = irq_cfg(irq);
- if (!cfg->vector)
+ if (!cfg->vector) {
setup_IO_APIC_irq(ioapic, pin, irq,
irq_trigger(irq_entry),
irq_polarity(irq_entry));
+ continue;
+
+ }
+
+ /*
+ * Honour affinities which have been set in early boot
+ */
+ desc = irq_to_desc(irq);
+ if (desc->status &
+ (IRQ_NO_BALANCING | IRQ_AFFINITY_SET))
+ mask = desc->affinity;
+ else
+ mask = TARGET_CPUS;
+
#ifdef CONFIG_INTR_REMAP
- else if (intr_remapping_enabled)
- set_ir_ioapic_affinity_irq(irq, TARGET_CPUS);
-#endif
+ if (intr_remapping_enabled)
+ set_ir_ioapic_affinity_irq(irq, mask);
else
- set_ioapic_affinity_irq(irq, TARGET_CPUS);
+#endif
+ set_ioapic_affinity_irq(irq, mask);
}
}
diff --git a/include/linux/irq.h b/include/linux/irq.h
index d058c57..3dddfa7 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -63,7 +63,8 @@ typedef void (*irq_flow_handler_t)(unsigned int irq,
#define IRQ_MOVE_PENDING 0x00200000 /* need to re-target IRQ destination */
#define IRQ_NO_BALANCING 0x00400000 /* IRQ is excluded from balancing */
#define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */
-#define IRQ_MOVE_PCNTXT 0x01000000 /* IRQ migration from process context */
+#define IRQ_MOVE_PCNTXT 0x01000000 /* IRQ migration from process context */
+#define IRQ_AFFINITY_SET 0x02000000 /* IRQ affinity was set from userspace*/
#ifdef CONFIG_IRQ_PER_CPU
# define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
@@ -130,7 +131,7 @@ struct irq_chip {
/**
* struct irq_desc - interrupt descriptor
- *
+ * @irq: interrupt number for this descriptor
* @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()]
* @chip: low level interrupt hardware access
* @msi_desc: MSI descriptor
@@ -149,7 +150,6 @@ struct irq_chip {
* @cpu: cpu index useful for balancing
* @pending_mask: pending rebalanced interrupts
* @dir: /proc/irq/ procfs entry
- * @affinity_entry: /proc/irq/smp_affinity procfs entry on SMP
* @name: flow handler name for /proc/interrupts output
*/
struct irq_desc {
@@ -210,7 +210,6 @@ extern int setup_irq(unsigned int irq, struct irqaction *new);
#ifdef CONFIG_GENERIC_PENDING_IRQ
-void set_pending_irq(unsigned int irq, cpumask_t mask);
void move_native_irq(int irq);
void move_masked_irq(int irq);
@@ -228,10 +227,6 @@ static inline void move_masked_irq(int irq)
{
}
-static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
-{
-}
-
#endif /* CONFIG_GENERIC_PENDING_IRQ */
#else /* CONFIG_SMP */
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index c9767e6..64c1c72 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -25,6 +25,8 @@ static inline void unregister_handler_proc(unsigned int irq,
struct irqaction *action) { }
#endif
+extern int irq_select_affinity_usr(unsigned int irq);
+
/*
* Debugging printout:
*/
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index c498a1b..801addd 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -82,24 +82,27 @@ int irq_can_set_affinity(unsigned int irq)
int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
{
struct irq_desc *desc = irq_to_desc(irq);
+ unsigned long flags;
if (!desc->chip->set_affinity)
return -EINVAL;
+ spin_lock_irqsave(&desc->lock, flags);
+
#ifdef CONFIG_GENERIC_PENDING_IRQ
if (desc->status & IRQ_MOVE_PCNTXT || desc->status & IRQ_DISABLED) {
- unsigned long flags;
-
- spin_lock_irqsave(&desc->lock, flags);
desc->affinity = cpumask;
desc->chip->set_affinity(irq, cpumask);
- spin_unlock_irqrestore(&desc->lock, flags);
- } else
- set_pending_irq(irq, cpumask);
+ } else {
+ desc->status |= IRQ_MOVE_PENDING;
+ desc->pending_mask = cpumask;
+ }
#else
desc->affinity = cpumask;
desc->chip->set_affinity(irq, cpumask);
#endif
+ desc->status |= IRQ_AFFINITY_SET;
+ spin_unlock_irqrestore(&desc->lock, flags);
return 0;
}
@@ -107,24 +110,59 @@ int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
/*
* Generic version of the affinity autoselector.
*/
-int irq_select_affinity(unsigned int irq)
+int do_irq_select_affinity(unsigned int irq, struct irq_desc *desc)
{
cpumask_t mask;
- struct irq_desc *desc;
if (!irq_can_set_affinity(irq))
return 0;
cpus_and(mask, cpu_online_map, irq_default_affinity);
- desc = irq_to_desc(irq);
+ /*
+ * Preserve an userspace affinity setup, but make sure that
+ * one of the targets is online.
+ */
+ if (desc->status & (IRQ_AFFINITY_SET | IRQ_NO_BALANCING)) {
+ if (cpus_intersects(desc->affinity, cpu_online_map))
+ mask = desc->affinity;
+ else
+ desc->status &= ~IRQ_AFFINITY_SET;
+ }
+
desc->affinity = mask;
desc->chip->set_affinity(irq, mask);
return 0;
}
+#else
+static inline int do_irq_select_affinity(unsigned int irq, struct irq_desc *d)
+{
+ return irq_select_affinity(irq);
+}
#endif
+/*
+ * Called when affinity is set via /proc/irq
+ */
+int irq_select_affinity_usr(unsigned int irq)
+{
+ struct irq_desc *desc = irq_to_desc(irq);
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&desc->lock, flags);
+ ret = do_irq_select_affinity(irq, desc);
+ spin_unlock_irqrestore(&desc->lock, flags);
+
+ return ret;
+}
+
+#else
+static inline int do_irq_select_affinity(int irq, struct irq_desc *desc)
+{
+ return 0;
+}
#endif
/**
@@ -327,7 +365,7 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
* IRQF_TRIGGER_* but the PIC does not support multiple
* flow-types?
*/
- pr_warning("No set_type function for IRQ %d (%s)\n", irq,
+ pr_debug("No set_type function for IRQ %d (%s)\n", irq,
chip ? (chip->name ? : "unknown") : "unknown");
return 0;
}
@@ -445,8 +483,12 @@ __setup_irq(unsigned int irq, struct irq_desc * desc, struct irqaction *new)
/* Undo nested disables: */
desc->depth = 1;
+ /* Exclude IRQ from balancing if requested */
+ if (new->flags & IRQF_NOBALANCING)
+ desc->status |= IRQ_NO_BALANCING;
+
/* Set default affinity mask once everything is setup */
- irq_select_affinity(irq);
+ do_irq_select_affinity(irq, desc);
} else if ((new->flags & IRQF_TRIGGER_MASK)
&& (new->flags & IRQF_TRIGGER_MASK)
@@ -459,10 +501,6 @@ __setup_irq(unsigned int irq, struct irq_desc * desc, struct irqaction *new)
*p = new;
- /* Exclude IRQ from balancing */
- if (new->flags & IRQF_NOBALANCING)
- desc->status |= IRQ_NO_BALANCING;
-
/* Reset broken irq detection when installing new handler */
desc->irq_count = 0;
desc->irqs_unhandled = 0;
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index 90b920d..9db681d 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -1,17 +1,6 @@
#include <linux/irq.h>
-void set_pending_irq(unsigned int irq, cpumask_t mask)
-{
- struct irq_desc *desc = irq_to_desc(irq);
- unsigned long flags;
-
- spin_lock_irqsave(&desc->lock, flags);
- desc->status |= IRQ_MOVE_PENDING;
- desc->pending_mask = mask;
- spin_unlock_irqrestore(&desc->lock, flags);
-}
-
void move_masked_irq(int irq)
{
struct irq_desc *desc = irq_to_desc(irq);
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index 4d161c7..d257e7d 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -62,7 +62,7 @@ static ssize_t irq_affinity_proc_write(struct file *file,
if (!cpus_intersects(new_value, cpu_online_map))
/* Special case for empty set - allow the architecture
code to set default SMP affinity. */
- return irq_select_affinity(irq) ? -EINVAL : count;
+ return irq_select_affinity_usr(irq) ? -EINVAL : count;
irq_set_affinity(irq, new_value);
--
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