aboutsummaryrefslogtreecommitdiff
path: root/kernel/irq
diff options
context:
space:
mode:
authorIngo Molnar <mingo@elte.hu>2009-01-16 17:46:22 +0100
committerIngo Molnar <mingo@elte.hu>2009-01-16 17:46:22 +0100
commit5a2dd72abdae75ea2960145e0549635ce4e0be96 (patch)
tree44dba0119c75679a17215200f92ab23bdde9efc2 /kernel/irq
parentefdc64f0c792ea744bcc9203f35b908e66d42f41 (diff)
parent7cb36b6ccdca03bd87e8faca7fd920643dd1aec7 (diff)
Merge branch 'linus' into irq/genirq
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/autoprobe.c20
-rw-r--r--kernel/irq/chip.c2
-rw-r--r--kernel/irq/handle.c48
-rw-r--r--kernel/irq/manage.c43
-rw-r--r--kernel/irq/migration.c14
-rw-r--r--kernel/irq/numa_migrate.c7
-rw-r--r--kernel/irq/proc.c57
-rw-r--r--kernel/irq/spurious.c5
8 files changed, 115 insertions, 81 deletions
diff --git a/kernel/irq/autoprobe.c b/kernel/irq/autoprobe.c
index 650ce4102a6..1de9700f416 100644
--- a/kernel/irq/autoprobe.c
+++ b/kernel/irq/autoprobe.c
@@ -10,6 +10,7 @@
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
+#include <linux/async.h>
#include "internals.h"
@@ -34,15 +35,16 @@ unsigned long probe_irq_on(void)
unsigned int status;
int i;
+ /*
+ * quiesce the kernel, or at least the asynchronous portion
+ */
+ async_synchronize_full();
mutex_lock(&probing_active);
/*
* something may have generated an irq long ago and we want to
* flush such a longstanding irq before considering it as spurious.
*/
for_each_irq_desc_reverse(i, desc) {
- if (!desc)
- continue;
-
spin_lock_irq(&desc->lock);
if (!desc->action && !(desc->status & IRQ_NOPROBE)) {
/*
@@ -71,9 +73,6 @@ unsigned long probe_irq_on(void)
* happened in the previous stage, it may have masked itself)
*/
for_each_irq_desc_reverse(i, desc) {
- if (!desc)
- continue;
-
spin_lock_irq(&desc->lock);
if (!desc->action && !(desc->status & IRQ_NOPROBE)) {
desc->status |= IRQ_AUTODETECT | IRQ_WAITING;
@@ -92,9 +91,6 @@ unsigned long probe_irq_on(void)
* Now filter out any obviously spurious interrupts
*/
for_each_irq_desc(i, desc) {
- if (!desc)
- continue;
-
spin_lock_irq(&desc->lock);
status = desc->status;
@@ -133,9 +129,6 @@ unsigned int probe_irq_mask(unsigned long val)
int i;
for_each_irq_desc(i, desc) {
- if (!desc)
- continue;
-
spin_lock_irq(&desc->lock);
status = desc->status;
@@ -178,9 +171,6 @@ int probe_irq_off(unsigned long val)
unsigned int status;
for_each_irq_desc(i, desc) {
- if (!desc)
- continue;
-
spin_lock_irq(&desc->lock);
status = desc->status;
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 0ad02d76a0c..9a7fbb84f56 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -46,7 +46,7 @@ void dynamic_irq_init(unsigned int irq)
desc->irq_count = 0;
desc->irqs_unhandled = 0;
#ifdef CONFIG_SMP
- cpus_setall(desc->affinity);
+ cpumask_setall(&desc->affinity);
#endif
spin_unlock_irqrestore(&desc->lock, flags);
}
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 6492400cb50..c20db0be917 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -56,10 +56,6 @@ void handle_bad_irq(unsigned int irq, struct irq_desc *desc)
int nr_irqs = NR_IRQS;
EXPORT_SYMBOL_GPL(nr_irqs);
-void __init __attribute__((weak)) arch_early_irq_init(void)
-{
-}
-
#ifdef CONFIG_SPARSE_IRQ
static struct irq_desc irq_desc_init = {
.irq = -1,
@@ -90,13 +86,11 @@ void init_kstat_irqs(struct irq_desc *desc, int cpu, int nr)
desc->kstat_irqs = (unsigned int *)ptr;
}
-void __attribute__((weak)) arch_init_chip_data(struct irq_desc *desc, int cpu)
-{
-}
-
static void init_one_irq_desc(int irq, struct irq_desc *desc, int cpu)
{
memcpy(desc, &irq_desc_init, sizeof(struct irq_desc));
+
+ spin_lock_init(&desc->lock);
desc->irq = irq;
#ifdef CONFIG_SMP
desc->cpu = cpu;
@@ -134,7 +128,7 @@ static struct irq_desc irq_desc_legacy[NR_IRQS_LEGACY] __cacheline_aligned_in_sm
/* FIXME: use bootmem alloc ...*/
static unsigned int kstat_irqs_legacy[NR_IRQS_LEGACY][NR_CPUS];
-void __init early_irq_init(void)
+int __init early_irq_init(void)
{
struct irq_desc *desc;
int legacy_count;
@@ -146,6 +140,7 @@ void __init early_irq_init(void)
for (i = 0; i < legacy_count; i++) {
desc[i].irq = i;
desc[i].kstat_irqs = kstat_irqs_legacy[i];
+ lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
irq_desc_ptrs[i] = desc + i;
}
@@ -153,7 +148,7 @@ void __init early_irq_init(void)
for (i = legacy_count; i < NR_IRQS; i++)
irq_desc_ptrs[i] = NULL;
- arch_early_irq_init();
+ return arch_early_irq_init();
}
struct irq_desc *irq_to_desc(unsigned int irq)
@@ -203,7 +198,7 @@ out_unlock:
return desc;
}
-#else
+#else /* !CONFIG_SPARSE_IRQ */
struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
[0 ... NR_IRQS-1] = {
@@ -218,7 +213,31 @@ struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
}
};
-#endif
+int __init early_irq_init(void)
+{
+ struct irq_desc *desc;
+ int count;
+ int i;
+
+ desc = irq_desc;
+ count = ARRAY_SIZE(irq_desc);
+
+ for (i = 0; i < count; i++)
+ desc[i].irq = i;
+
+ return arch_early_irq_init();
+}
+
+struct irq_desc *irq_to_desc(unsigned int irq)
+{
+ return (irq < NR_IRQS) ? irq_desc + irq : NULL;
+}
+
+struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu)
+{
+ return irq_to_desc(irq);
+}
+#endif /* !CONFIG_SPARSE_IRQ */
/*
* What should we do if we get a hw irq event on an illegal vector?
@@ -428,9 +447,6 @@ void early_init_irq_lock_class(void)
int i;
for_each_irq_desc(i, desc) {
- if (!desc)
- continue;
-
lockdep_set_class(&desc->lock, &irq_desc_lock_class);
}
}
@@ -439,7 +455,7 @@ void early_init_irq_lock_class(void)
unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
{
struct irq_desc *desc = irq_to_desc(irq);
- return desc->kstat_irqs[cpu];
+ return desc ? desc->kstat_irqs[cpu] : 0;
}
#endif
EXPORT_SYMBOL(kstat_irqs_cpu);
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 46953a06f4a..cd0cd8dcb34 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -16,8 +16,15 @@
#include "internals.h"
#ifdef CONFIG_SMP
+cpumask_var_t irq_default_affinity;
-cpumask_t irq_default_affinity = CPU_MASK_ALL;
+static int init_irq_default_affinity(void)
+{
+ alloc_cpumask_var(&irq_default_affinity, GFP_KERNEL);
+ cpumask_setall(irq_default_affinity);
+ return 0;
+}
+core_initcall(init_irq_default_affinity);
/**
* synchronize_irq - wait for pending IRQ handlers (on other CPUs)
@@ -79,7 +86,7 @@ int irq_can_set_affinity(unsigned int irq)
* @cpumask: cpumask
*
*/
-int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
+int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
{
struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
@@ -91,14 +98,14 @@ int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
#ifdef CONFIG_GENERIC_PENDING_IRQ
if (desc->status & IRQ_MOVE_PCNTXT || desc->status & IRQ_DISABLED) {
- desc->affinity = cpumask;
+ cpumask_copy(&desc->affinity, cpumask);
desc->chip->set_affinity(irq, cpumask);
} else {
desc->status |= IRQ_MOVE_PENDING;
- desc->pending_mask = cpumask;
+ cpumask_copy(&desc->pending_mask, cpumask);
}
#else
- desc->affinity = cpumask;
+ cpumask_copy(&desc->affinity, cpumask);
desc->chip->set_affinity(irq, cpumask);
#endif
desc->status |= IRQ_AFFINITY_SET;
@@ -112,26 +119,24 @@ int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
*/
int do_irq_select_affinity(unsigned int irq, struct irq_desc *desc)
{
- cpumask_t mask;
-
if (!irq_can_set_affinity(irq))
return 0;
- cpus_and(mask, cpu_online_map, irq_default_affinity);
-
/*
* 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;
+ if (cpumask_any_and(&desc->affinity, cpu_online_mask)
+ < nr_cpu_ids)
+ goto set_affinity;
else
desc->status &= ~IRQ_AFFINITY_SET;
}
- desc->affinity = mask;
- desc->chip->set_affinity(irq, mask);
+ cpumask_and(&desc->affinity, cpu_online_mask, irq_default_affinity);
+set_affinity:
+ desc->chip->set_affinity(irq, &desc->affinity);
return 0;
}
@@ -676,6 +681,18 @@ int request_irq(unsigned int irq, irq_handler_t handler,
struct irq_desc *desc;
int retval;
+ /*
+ * handle_IRQ_event() always ignores IRQF_DISABLED except for
+ * the _first_ irqaction (sigh). That can cause oopsing, but
+ * the behavior is classified as "will not fix" so we need to
+ * start nudging drivers away from using that idiom.
+ */
+ if ((irqflags & (IRQF_SHARED|IRQF_DISABLED))
+ == (IRQF_SHARED|IRQF_DISABLED))
+ pr_warning("IRQ %d/%s: IRQF_DISABLED is not "
+ "guaranteed on shared IRQs\n",
+ irq, devname);
+
#ifdef CONFIG_LOCKDEP
/*
* Lockdep wants atomic interrupt handlers:
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index 9db681d9581..bd72329e630 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -4,7 +4,6 @@
void move_masked_irq(int irq)
{
struct irq_desc *desc = irq_to_desc(irq);
- cpumask_t tmp;
if (likely(!(desc->status & IRQ_MOVE_PENDING)))
return;
@@ -19,7 +18,7 @@ void move_masked_irq(int irq)
desc->status &= ~IRQ_MOVE_PENDING;
- if (unlikely(cpus_empty(desc->pending_mask)))
+ if (unlikely(cpumask_empty(&desc->pending_mask)))
return;
if (!desc->chip->set_affinity)
@@ -27,8 +26,6 @@ void move_masked_irq(int irq)
assert_spin_locked(&desc->lock);
- cpus_and(tmp, desc->pending_mask, cpu_online_map);
-
/*
* If there was a valid mask to work with, please
* do the disable, re-program, enable sequence.
@@ -41,10 +38,13 @@ void move_masked_irq(int irq)
* For correct operation this depends on the caller
* masking the irqs.
*/
- if (likely(!cpus_empty(tmp))) {
- desc->chip->set_affinity(irq,tmp);
+ if (likely(cpumask_any_and(&desc->pending_mask, cpu_online_mask)
+ < nr_cpu_ids)) {
+ cpumask_and(&desc->affinity,
+ &desc->pending_mask, cpu_online_mask);
+ desc->chip->set_affinity(irq, &desc->affinity);
}
- cpus_clear(desc->pending_mask);
+ cpumask_clear(&desc->pending_mask);
}
void move_native_irq(int irq)
diff --git a/kernel/irq/numa_migrate.c b/kernel/irq/numa_migrate.c
index 089c3746358..ecf765c6a77 100644
--- a/kernel/irq/numa_migrate.c
+++ b/kernel/irq/numa_migrate.c
@@ -42,6 +42,7 @@ static void init_copy_one_irq_desc(int irq, struct irq_desc *old_desc,
struct irq_desc *desc, int cpu)
{
memcpy(desc, old_desc, sizeof(struct irq_desc));
+ spin_lock_init(&desc->lock);
desc->cpu = cpu;
lockdep_set_class(&desc->lock, &irq_desc_lock_class);
init_copy_kstat_irqs(old_desc, desc, cpu, nr_cpu_ids);
@@ -74,10 +75,8 @@ static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
node = cpu_to_node(cpu);
desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node);
- printk(KERN_DEBUG " move irq_desc for %d to cpu %d node %d\n",
- irq, cpu, node);
if (!desc) {
- printk(KERN_ERR "can not get new irq_desc for moving\n");
+ printk(KERN_ERR "irq %d: can not get new irq_desc for migration.\n", irq);
/* still use old one */
desc = old_desc;
goto out_unlock;
@@ -106,8 +105,6 @@ struct irq_desc *move_irq_desc(struct irq_desc *desc, int cpu)
return desc;
old_cpu = desc->cpu;
- printk(KERN_DEBUG
- "try to move irq_desc from cpu %d to %d\n", old_cpu, cpu);
if (old_cpu != cpu) {
node = cpu_to_node(cpu);
old_node = cpu_to_node(old_cpu);
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index f6b3440f05b..aae3f742bce 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -20,7 +20,7 @@ static struct proc_dir_entry *root_irq_dir;
static int irq_affinity_proc_show(struct seq_file *m, void *v)
{
struct irq_desc *desc = irq_to_desc((long)m->private);
- cpumask_t *mask = &desc->affinity;
+ const struct cpumask *mask = &desc->affinity;
#ifdef CONFIG_GENERIC_PENDING_IRQ
if (desc->status & IRQ_MOVE_PENDING)
@@ -40,33 +40,42 @@ static ssize_t irq_affinity_proc_write(struct file *file,
const char __user *buffer, size_t count, loff_t *pos)
{
unsigned int irq = (int)(long)PDE(file->f_path.dentry->d_inode)->data;
- cpumask_t new_value;
+ cpumask_var_t new_value;
int err;
if (!irq_to_desc(irq)->chip->set_affinity || no_irq_affinity ||
irq_balancing_disabled(irq))
return -EIO;
+ if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
+ return -ENOMEM;
+
err = cpumask_parse_user(buffer, count, new_value);
if (err)
- return err;
+ goto free_cpumask;
- if (!is_affinity_mask_valid(new_value))
- return -EINVAL;
+ if (!is_affinity_mask_valid(new_value)) {
+ err = -EINVAL;
+ goto free_cpumask;
+ }
/*
* Do not allow disabling IRQs completely - it's a too easy
* way to make the system unusable accidentally :-) At least
* one online CPU still has to be targeted.
*/
- if (!cpus_intersects(new_value, cpu_online_map))
+ if (!cpumask_intersects(new_value, cpu_online_mask)) {
/* Special case for empty set - allow the architecture
code to set default SMP affinity. */
- return irq_select_affinity_usr(irq) ? -EINVAL : count;
-
- irq_set_affinity(irq, new_value);
+ err = irq_select_affinity_usr(irq) ? -EINVAL : count;
+ } else {
+ irq_set_affinity(irq, new_value);
+ err = count;
+ }
- return count;
+free_cpumask:
+ free_cpumask_var(new_value);
+ return err;
}
static int irq_affinity_proc_open(struct inode *inode, struct file *file)
@@ -84,7 +93,7 @@ static const struct file_operations irq_affinity_proc_fops = {
static int default_affinity_show(struct seq_file *m, void *v)
{
- seq_cpumask(m, &irq_default_affinity);
+ seq_cpumask(m, irq_default_affinity);
seq_putc(m, '\n');
return 0;
}
@@ -92,27 +101,37 @@ static int default_affinity_show(struct seq_file *m, void *v)
static ssize_t default_affinity_write(struct file *file,
const char __user *buffer, size_t count, loff_t *ppos)
{
- cpumask_t new_value;
+ cpumask_var_t new_value;
int err;
+ if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
+ return -ENOMEM;
+
err = cpumask_parse_user(buffer, count, new_value);
if (err)
- return err;
+ goto out;
- if (!is_affinity_mask_valid(new_value))
- return -EINVAL;
+ if (!is_affinity_mask_valid(new_value)) {
+ err = -EINVAL;
+ goto out;
+ }
/*
* Do not allow disabling IRQs completely - it's a too easy
* way to make the system unusable accidentally :-) At least
* one online CPU still has to be targeted.
*/
- if (!cpus_intersects(new_value, cpu_online_map))
- return -EINVAL;
+ if (!cpumask_intersects(new_value, cpu_online_mask)) {
+ err = -EINVAL;
+ goto out;
+ }
- irq_default_affinity = new_value;
+ cpumask_copy(irq_default_affinity, new_value);
+ err = count;
- return count;
+out:
+ free_cpumask_var(new_value);
+ return err;
}
static int default_affinity_open(struct inode *inode, struct file *file)
diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c
index 3738107531f..dd364c11e56 100644
--- a/kernel/irq/spurious.c
+++ b/kernel/irq/spurious.c
@@ -91,9 +91,6 @@ static int misrouted_irq(int irq)
int i, ok = 0;
for_each_irq_desc(i, desc) {
- if (!desc)
- continue;
-
if (!i)
continue;
@@ -115,8 +112,6 @@ static void poll_spurious_irqs(unsigned long dummy)
for_each_irq_desc(i, desc) {
unsigned int status;
- if (!desc)
- continue;
if (!i)
continue;