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authorLinus Torvalds <torvalds@linux-foundation.org>2014-04-01 11:22:57 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-01 11:22:57 -0700
commit683b6c6f82a60fabf47012581c2cfbf1b037ab95 (patch)
tree6a3fdf26b98aebf4b0b9eca8d242ba89e0565d8b /kernel
parent1ead65812486cda65093683a99b8907a7242fa93 (diff)
parent1b422ecd27866985b9f35d0d2b5ae6e9122dd4c0 (diff)
downloadlinux-683b6c6f82a60fabf47012581c2cfbf1b037ab95.tar.gz
Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull irq code updates from Thomas Gleixner: "The irq department proudly presents: - Another tree wide sweep of irq infrastructure abuse. Clear winner of the trainwreck engineering contest was: #include "../../../kernel/irq/settings.h" - Tree wide update of irq_set_affinity() callbacks which miss a cpu online check when picking a single cpu out of the affinity mask. - Tree wide consolidation of interrupt statistics. - Updates to the threaded interrupt infrastructure to allow explicit wakeup of the interrupt thread and a variant of synchronize_irq() which synchronizes only the hard interrupt handler. Both are needed to replace the homebrewn thread handling in the mmc/sdhci code. - New irq chip callbacks to allow proper support for GPIO based irqs. The GPIO based interrupts need to request/release GPIO resources from request/free_irq. - A few new ARM interrupt chips. No revolutionary new hardware, just differently wreckaged variations of the scheme. - Small improvments, cleanups and updates all over the place" I was hoping that that trainwreck engineering contest was a April Fools' joke. But no. * 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (68 commits) irqchip: sun7i/sun6i: Disable NMI before registering the handler ARM: sun7i/sun6i: dts: Fix IRQ number for sun6i NMI controller ARM: sun7i/sun6i: irqchip: Update the documentation ARM: sun7i/sun6i: dts: Add NMI irqchip support ARM: sun7i/sun6i: irqchip: Add irqchip driver for NMI controller genirq: Export symbol no_action() arm: omap: Fix typo in ams-delta-fiq.c m68k: atari: Fix the last kernel_stat.h fallout irqchip: sun4i: Simplify sun4i_irq_ack irqchip: sun4i: Use handle_fasteoi_irq for all interrupts genirq: procfs: Make smp_affinity values go+r softirq: Add linux/irq.h to make it compile again m68k: amiga: Add linux/irq.h to make it compile again irqchip: sun4i: Don't ack IRQs > 0, fix acking of IRQ 0 irqchip: sun4i: Fix a comment about mask register initialization irqchip: sun4i: Fix irq 0 not working genirq: Add a new IRQCHIP_EOI_THREADED flag genirq: Document IRQCHIP_ONESHOT_SAFE flag ARM: sunxi: dt: Convert to the new irq controller compatibles irqchip: sunxi: Change compatibles ...
Diffstat (limited to 'kernel')
-rw-r--r--kernel/irq/chip.c48
-rw-r--r--kernel/irq/handle.c5
-rw-r--r--kernel/irq/internals.h9
-rw-r--r--kernel/irq/irqdesc.c5
-rw-r--r--kernel/irq/manage.c129
-rw-r--r--kernel/irq/proc.c8
-rw-r--r--kernel/softirq.c1
7 files changed, 168 insertions, 37 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index dc04c166c54..6397df2d694 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -281,6 +281,19 @@ void unmask_irq(struct irq_desc *desc)
}
}
+void unmask_threaded_irq(struct irq_desc *desc)
+{
+ struct irq_chip *chip = desc->irq_data.chip;
+
+ if (chip->flags & IRQCHIP_EOI_THREADED)
+ chip->irq_eoi(&desc->irq_data);
+
+ if (chip->irq_unmask) {
+ chip->irq_unmask(&desc->irq_data);
+ irq_state_clr_masked(desc);
+ }
+}
+
/*
* handle_nested_irq - Handle a nested irq from a irq thread
* @irq: the interrupt number
@@ -435,6 +448,27 @@ static inline void preflow_handler(struct irq_desc *desc)
static inline void preflow_handler(struct irq_desc *desc) { }
#endif
+static void cond_unmask_eoi_irq(struct irq_desc *desc, struct irq_chip *chip)
+{
+ if (!(desc->istate & IRQS_ONESHOT)) {
+ chip->irq_eoi(&desc->irq_data);
+ return;
+ }
+ /*
+ * We need to unmask in the following cases:
+ * - Oneshot irq which did not wake the thread (caused by a
+ * spurious interrupt or a primary handler handling it
+ * completely).
+ */
+ if (!irqd_irq_disabled(&desc->irq_data) &&
+ irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot) {
+ chip->irq_eoi(&desc->irq_data);
+ unmask_irq(desc);
+ } else if (!(chip->flags & IRQCHIP_EOI_THREADED)) {
+ chip->irq_eoi(&desc->irq_data);
+ }
+}
+
/**
* handle_fasteoi_irq - irq handler for transparent controllers
* @irq: the interrupt number
@@ -448,6 +482,8 @@ static inline void preflow_handler(struct irq_desc *desc) { }
void
handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
{
+ struct irq_chip *chip = desc->irq_data.chip;
+
raw_spin_lock(&desc->lock);
if (unlikely(irqd_irq_inprogress(&desc->irq_data)))
@@ -473,18 +509,14 @@ handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
preflow_handler(desc);
handle_irq_event(desc);
- if (desc->istate & IRQS_ONESHOT)
- cond_unmask_irq(desc);
+ cond_unmask_eoi_irq(desc, chip);
-out_eoi:
- desc->irq_data.chip->irq_eoi(&desc->irq_data);
-out_unlock:
raw_spin_unlock(&desc->lock);
return;
out:
- if (!(desc->irq_data.chip->flags & IRQCHIP_EOI_IF_HANDLED))
- goto out_eoi;
- goto out_unlock;
+ if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
+ chip->irq_eoi(&desc->irq_data);
+ raw_spin_unlock(&desc->lock);
}
/**
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 131ca176b49..63548027085 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -41,6 +41,7 @@ irqreturn_t no_action(int cpl, void *dev_id)
{
return IRQ_NONE;
}
+EXPORT_SYMBOL_GPL(no_action);
static void warn_no_thread(unsigned int irq, struct irqaction *action)
{
@@ -51,7 +52,7 @@ static void warn_no_thread(unsigned int irq, struct irqaction *action)
"but no thread function available.", irq, action->name);
}
-static void irq_wake_thread(struct irq_desc *desc, struct irqaction *action)
+void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action)
{
/*
* In case the thread crashed and was killed we just pretend that
@@ -157,7 +158,7 @@ handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action)
break;
}
- irq_wake_thread(desc, action);
+ __irq_wake_thread(desc, action);
/* Fall through to add to randomness */
case IRQ_HANDLED:
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index 001fa5bab49..ddf1ffeb79f 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -6,6 +6,7 @@
* of this file for your non core code.
*/
#include <linux/irqdesc.h>
+#include <linux/kernel_stat.h>
#ifdef CONFIG_SPARSE_IRQ
# define IRQ_BITMAP_BITS (NR_IRQS + 8196)
@@ -73,6 +74,7 @@ extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
extern void mask_irq(struct irq_desc *desc);
extern void unmask_irq(struct irq_desc *desc);
+extern void unmask_threaded_irq(struct irq_desc *desc);
extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
@@ -82,6 +84,7 @@ irqreturn_t handle_irq_event(struct irq_desc *desc);
/* Resending of interrupts :*/
void check_irq_resend(struct irq_desc *desc, unsigned int irq);
bool irq_wait_for_poll(struct irq_desc *desc);
+void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);
#ifdef CONFIG_PROC_FS
extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
@@ -179,3 +182,9 @@ static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
{
return d->state_use_accessors & mask;
}
+
+static inline void kstat_incr_irqs_this_cpu(unsigned int irq, struct irq_desc *desc)
+{
+ __this_cpu_inc(*desc->kstat_irqs);
+ __this_cpu_inc(kstat.irqs_sum);
+}
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 8ab8e939029..a7174617616 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -489,6 +489,11 @@ void dynamic_irq_cleanup(unsigned int irq)
raw_spin_unlock_irqrestore(&desc->lock, flags);
}
+void kstat_incr_irq_this_cpu(unsigned int irq)
+{
+ kstat_incr_irqs_this_cpu(irq, irq_to_desc(irq));
+}
+
unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
{
struct irq_desc *desc = irq_to_desc(irq);
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index d3bf660cb57..2486a4c1a71 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -32,24 +32,10 @@ static int __init setup_forced_irqthreads(char *arg)
early_param("threadirqs", setup_forced_irqthreads);
#endif
-/**
- * synchronize_irq - wait for pending IRQ handlers (on other CPUs)
- * @irq: interrupt number to wait for
- *
- * This function waits for any pending IRQ handlers for this interrupt
- * to complete before returning. If you use this function while
- * holding a resource the IRQ handler may need you will deadlock.
- *
- * This function may be called - with care - from IRQ context.
- */
-void synchronize_irq(unsigned int irq)
+static void __synchronize_hardirq(struct irq_desc *desc)
{
- struct irq_desc *desc = irq_to_desc(irq);
bool inprogress;
- if (!desc)
- return;
-
do {
unsigned long flags;
@@ -67,12 +53,56 @@ void synchronize_irq(unsigned int irq)
/* Oops, that failed? */
} while (inprogress);
+}
- /*
- * We made sure that no hardirq handler is running. Now verify
- * that no threaded handlers are active.
- */
- wait_event(desc->wait_for_threads, !atomic_read(&desc->threads_active));
+/**
+ * synchronize_hardirq - wait for pending hard IRQ handlers (on other CPUs)
+ * @irq: interrupt number to wait for
+ *
+ * This function waits for any pending hard IRQ handlers for this
+ * interrupt to complete before returning. If you use this
+ * function while holding a resource the IRQ handler may need you
+ * will deadlock. It does not take associated threaded handlers
+ * into account.
+ *
+ * Do not use this for shutdown scenarios where you must be sure
+ * that all parts (hardirq and threaded handler) have completed.
+ *
+ * This function may be called - with care - from IRQ context.
+ */
+void synchronize_hardirq(unsigned int irq)
+{
+ struct irq_desc *desc = irq_to_desc(irq);
+
+ if (desc)
+ __synchronize_hardirq(desc);
+}
+EXPORT_SYMBOL(synchronize_hardirq);
+
+/**
+ * synchronize_irq - wait for pending IRQ handlers (on other CPUs)
+ * @irq: interrupt number to wait for
+ *
+ * This function waits for any pending IRQ handlers for this interrupt
+ * to complete before returning. If you use this function while
+ * holding a resource the IRQ handler may need you will deadlock.
+ *
+ * This function may be called - with care - from IRQ context.
+ */
+void synchronize_irq(unsigned int irq)
+{
+ struct irq_desc *desc = irq_to_desc(irq);
+
+ if (desc) {
+ __synchronize_hardirq(desc);
+ /*
+ * We made sure that no hardirq handler is
+ * running. Now verify that no threaded handlers are
+ * active.
+ */
+ wait_event(desc->wait_for_threads,
+ !atomic_read(&desc->threads_active));
+ }
}
EXPORT_SYMBOL(synchronize_irq);
@@ -718,7 +748,7 @@ again:
if (!desc->threads_oneshot && !irqd_irq_disabled(&desc->irq_data) &&
irqd_irq_masked(&desc->irq_data))
- unmask_irq(desc);
+ unmask_threaded_irq(desc);
out_unlock:
raw_spin_unlock_irq(&desc->lock);
@@ -727,7 +757,7 @@ out_unlock:
#ifdef CONFIG_SMP
/*
- * Check whether we need to chasnge the affinity of the interrupt thread.
+ * Check whether we need to change the affinity of the interrupt thread.
*/
static void
irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action)
@@ -880,6 +910,33 @@ static int irq_thread(void *data)
return 0;
}
+/**
+ * irq_wake_thread - wake the irq thread for the action identified by dev_id
+ * @irq: Interrupt line
+ * @dev_id: Device identity for which the thread should be woken
+ *
+ */
+void irq_wake_thread(unsigned int irq, void *dev_id)
+{
+ struct irq_desc *desc = irq_to_desc(irq);
+ struct irqaction *action;
+ unsigned long flags;
+
+ if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc)))
+ return;
+
+ raw_spin_lock_irqsave(&desc->lock, flags);
+ for (action = desc->action; action; action = action->next) {
+ if (action->dev_id == dev_id) {
+ if (action->thread)
+ __irq_wake_thread(desc, action);
+ break;
+ }
+ }
+ raw_spin_unlock_irqrestore(&desc->lock, flags);
+}
+EXPORT_SYMBOL_GPL(irq_wake_thread);
+
static void irq_setup_forced_threading(struct irqaction *new)
{
if (!force_irqthreads)
@@ -896,6 +953,23 @@ static void irq_setup_forced_threading(struct irqaction *new)
}
}
+static int irq_request_resources(struct irq_desc *desc)
+{
+ struct irq_data *d = &desc->irq_data;
+ struct irq_chip *c = d->chip;
+
+ return c->irq_request_resources ? c->irq_request_resources(d) : 0;
+}
+
+static void irq_release_resources(struct irq_desc *desc)
+{
+ struct irq_data *d = &desc->irq_data;
+ struct irq_chip *c = d->chip;
+
+ if (c->irq_release_resources)
+ c->irq_release_resources(d);
+}
+
/*
* Internal function to register an irqaction - typically used to
* allocate special interrupts that are part of the architecture.
@@ -1091,6 +1165,13 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
}
if (!shared) {
+ ret = irq_request_resources(desc);
+ if (ret) {
+ pr_err("Failed to request resources for %s (irq %d) on irqchip %s\n",
+ new->name, irq, desc->irq_data.chip->name);
+ goto out_mask;
+ }
+
init_waitqueue_head(&desc->wait_for_threads);
/* Setup the type (level, edge polarity) if configured: */
@@ -1261,8 +1342,10 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
*action_ptr = action->next;
/* If this was the last handler, shut down the IRQ line: */
- if (!desc->action)
+ if (!desc->action) {
irq_shutdown(desc);
+ irq_release_resources(desc);
+ }
#ifdef CONFIG_SMP
/* make sure affinity_hint is cleaned up */
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index 36f6ee181b0..ac1ba2f1103 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -324,15 +324,15 @@ void register_irq_proc(unsigned int irq, struct irq_desc *desc)
#ifdef CONFIG_SMP
/* create /proc/irq/<irq>/smp_affinity */
- proc_create_data("smp_affinity", 0600, desc->dir,
+ proc_create_data("smp_affinity", 0644, desc->dir,
&irq_affinity_proc_fops, (void *)(long)irq);
/* create /proc/irq/<irq>/affinity_hint */
- proc_create_data("affinity_hint", 0400, desc->dir,
+ proc_create_data("affinity_hint", 0444, desc->dir,
&irq_affinity_hint_proc_fops, (void *)(long)irq);
/* create /proc/irq/<irq>/smp_affinity_list */
- proc_create_data("smp_affinity_list", 0600, desc->dir,
+ proc_create_data("smp_affinity_list", 0644, desc->dir,
&irq_affinity_list_proc_fops, (void *)(long)irq);
proc_create_data("node", 0444, desc->dir,
@@ -372,7 +372,7 @@ void unregister_handler_proc(unsigned int irq, struct irqaction *action)
static void register_default_affinity_proc(void)
{
#ifdef CONFIG_SMP
- proc_create("irq/default_smp_affinity", 0600, NULL,
+ proc_create("irq/default_smp_affinity", 0644, NULL,
&default_affinity_proc_fops);
#endif
}
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 490fcbb1dc5..b50990a5bea 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -25,6 +25,7 @@
#include <linux/smp.h>
#include <linux/smpboot.h>
#include <linux/tick.h>
+#include <linux/irq.h>
#define CREATE_TRACE_POINTS
#include <trace/events/irq.h>