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authorIngo Molnar <mingo@elte.hu>2009-09-07 08:19:51 +0200
committerIngo Molnar <mingo@elte.hu>2009-09-07 08:19:51 +0200
commita1922ed661ab2c1637d0b10cde933bd9cd33d965 (patch)
tree0f1777542b385ebefd30b3586d830fd8ed6fda5b /arch/blackfin/kernel/irqchip.c
parent75e33751ca8bbb72dd6f1a74d2810ddc8cbe4bdf (diff)
parentd28daf923ac5e4a0d7cecebae56f3e339189366b (diff)
downloadlinux-2.6.38-lt-ux500-a1922ed661ab2c1637d0b10cde933bd9cd33d965.tar.gz
Merge branch 'tracing/core' into tracing/hw-breakpoints
Conflicts: arch/Kconfig kernel/trace/trace.h Merge reason: resolve the conflicts, plus adopt to the new ring-buffer APIs. Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/blackfin/kernel/irqchip.c')
-rw-r--r--arch/blackfin/kernel/irqchip.c114
1 files changed, 47 insertions, 67 deletions
diff --git a/arch/blackfin/kernel/irqchip.c b/arch/blackfin/kernel/irqchip.c
index 6e31e935bb3..4b5fd36187d 100644
--- a/arch/blackfin/kernel/irqchip.c
+++ b/arch/blackfin/kernel/irqchip.c
@@ -38,38 +38,15 @@
#include <asm/pda.h>
static atomic_t irq_err_count;
-static spinlock_t irq_controller_lock;
-
-/*
- * Dummy mask/unmask handler
- */
-void dummy_mask_unmask_irq(unsigned int irq)
-{
-}
-
void ack_bad_irq(unsigned int irq)
{
atomic_inc(&irq_err_count);
printk(KERN_ERR "IRQ: spurious interrupt %d\n", irq);
}
-static struct irq_chip bad_chip = {
- .ack = dummy_mask_unmask_irq,
- .mask = dummy_mask_unmask_irq,
- .unmask = dummy_mask_unmask_irq,
-};
-
-static int bad_stats;
static struct irq_desc bad_irq_desc = {
- .status = IRQ_DISABLED,
- .chip = &bad_chip,
.handle_irq = handle_bad_irq,
- .depth = 1,
.lock = __SPIN_LOCK_UNLOCKED(irq_desc->lock),
- .kstat_irqs = &bad_stats,
-#ifdef CONFIG_SMP
- .affinity = CPU_MASK_ALL
-#endif
};
#ifdef CONFIG_CPUMASK_OFFSTACK
@@ -77,6 +54,7 @@ static struct irq_desc bad_irq_desc = {
#error "Blackfin architecture does not support CONFIG_CPUMASK_OFFSTACK."
#endif
+#ifdef CONFIG_PROC_FS
int show_interrupts(struct seq_file *p, void *v)
{
int i = *(loff_t *) v, j;
@@ -108,50 +86,29 @@ int show_interrupts(struct seq_file *p, void *v)
}
return 0;
}
-
-/*
- * do_IRQ handles all hardware IRQs. Decoded IRQs should not
- * come via this function. Instead, they should provide their
- * own 'handler'
- */
-#ifdef CONFIG_DO_IRQ_L1
-__attribute__((l1_text))
-#endif
-asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
-{
- struct pt_regs *old_regs;
- struct irq_desc *desc = irq_desc + irq;
-#ifndef CONFIG_IPIPE
- unsigned short pending, other_ints;
#endif
- old_regs = set_irq_regs(regs);
- /*
- * Some hardware gives randomly wrong interrupts. Rather
- * than crashing, do something sensible.
- */
- if (irq >= NR_IRQS)
- desc = &bad_irq_desc;
-
- irq_enter();
#ifdef CONFIG_DEBUG_STACKOVERFLOW
+static void check_stack_overflow(int irq)
+{
/* Debugging check for stack overflow: is there less than STACK_WARN free? */
- {
- long sp;
-
- sp = __get_SP() & (THREAD_SIZE-1);
+ long sp = __get_SP() & (THREAD_SIZE - 1);
- if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
- dump_stack();
- printk(KERN_EMERG "%s: possible stack overflow while handling irq %i "
- " only %ld bytes free\n",
- __func__, irq, sp - sizeof(struct thread_info));
- }
+ if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
+ dump_stack();
+ pr_emerg("irq%i: possible stack overflow only %ld bytes free\n",
+ irq, sp - sizeof(struct thread_info));
}
+}
+#else
+static inline void check_stack_overflow(int irq) { }
#endif
- generic_handle_irq(irq);
#ifndef CONFIG_IPIPE
+static void maybe_lower_to_irq14(void)
+{
+ unsigned short pending, other_ints;
+
/*
* If we're the only interrupt running (ignoring IRQ15 which
* is for syscalls), lower our priority to IRQ14 so that
@@ -165,7 +122,38 @@ asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
other_ints = pending & (pending - 1);
if (other_ints == 0)
lower_to_irq14();
-#endif /* !CONFIG_IPIPE */
+}
+#else
+static inline void maybe_lower_to_irq14(void) { }
+#endif
+
+/*
+ * do_IRQ handles all hardware IRQs. Decoded IRQs should not
+ * come via this function. Instead, they should provide their
+ * own 'handler'
+ */
+#ifdef CONFIG_DO_IRQ_L1
+__attribute__((l1_text))
+#endif
+asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
+{
+ struct pt_regs *old_regs = set_irq_regs(regs);
+
+ irq_enter();
+
+ check_stack_overflow(irq);
+
+ /*
+ * Some hardware gives randomly wrong interrupts. Rather
+ * than crashing, do something sensible.
+ */
+ if (irq >= NR_IRQS)
+ handle_bad_irq(irq, &bad_irq_desc);
+ else
+ generic_handle_irq(irq);
+
+ maybe_lower_to_irq14();
+
irq_exit();
set_irq_regs(old_regs);
@@ -173,14 +161,6 @@ asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
void __init init_IRQ(void)
{
- struct irq_desc *desc;
- int irq;
-
- spin_lock_init(&irq_controller_lock);
- for (irq = 0, desc = irq_desc; irq < NR_IRQS; irq++, desc++) {
- *desc = bad_irq_desc;
- }
-
init_arch_irq();
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND