genirq: Convert irq_desc.lock to raw_spinlock
[linux-3.10.git] / arch / mips / kernel / irq.c
index 7d93992..8b0b418 100644 (file)
@@ -8,7 +8,6 @@
  * Copyright (C) 1992 Linus Torvalds
  * Copyright (C) 1994 - 2000 Ralf Baechle
  */
-#include <linux/config.h>
 #include <linux/kernel.h>
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/sched.h>
 #include <linux/seq_file.h>
 #include <linux/kallsyms.h>
+#include <linux/kgdb.h>
 
 #include <asm/atomic.h>
 #include <asm/system.h>
 #include <asm/uaccess.h>
 
-/*
- * 'what should we do if we get a hw irq event on an illegal vector'.
- * each architecture has to answer this themselves.
- */
-void ack_bad_irq(unsigned int irq)
+#ifdef CONFIG_KGDB
+int kgdb_early_setup;
+#endif
+
+static unsigned long irq_map[NR_IRQS / BITS_PER_LONG];
+
+int allocate_irqno(void)
 {
-       printk("unexpected IRQ # %d\n", irq);
-}
+       int irq;
 
-atomic_t irq_err_count;
+again:
+       irq = find_first_zero_bit(irq_map, NR_IRQS);
 
-#undef do_IRQ
+       if (irq >= NR_IRQS)
+               return -ENOSPC;
+
+       if (test_and_set_bit(irq, irq_map))
+               goto again;
+
+       return irq;
+}
 
 /*
- * do_IRQ handles all normal device IRQ's (the special
- * SMP cross-CPU interrupts have their own specific
- * handlers).
+ * Allocate the 16 legacy interrupts for i8259 devices.  This happens early
+ * in the kernel initialization so treating allocation failure as BUG() is
+ * ok.
  */
-asmlinkage unsigned int do_IRQ(unsigned int irq, struct pt_regs *regs)
+void __init alloc_legacy_irqno(void)
 {
-       irq_enter();
+       int i;
 
-       __do_IRQ(irq, regs);
+       for (i = 0; i <= 16; i++)
+               BUG_ON(test_and_set_bit(i, irq_map));
+}
 
-       irq_exit();
+void free_irqno(unsigned int irq)
+{
+       smp_mb__before_clear_bit();
+       clear_bit(irq, irq_map);
+       smp_mb__after_clear_bit();
+}
 
-       return 1;
+/*
+ * 'what should we do if we get a hw irq event on an illegal vector'.
+ * each architecture has to answer this themselves.
+ */
+void ack_bad_irq(unsigned int irq)
+{
+       smtc_im_ack_irq(irq);
+       printk("unexpected IRQ # %d\n", irq);
 }
 
+atomic_t irq_err_count;
+
 /*
  * Generic, controller-independent functions:
  */
@@ -68,26 +93,24 @@ int show_interrupts(struct seq_file *p, void *v)
 
        if (i == 0) {
                seq_printf(p, "           ");
-               for (j=0; j<NR_CPUS; j++)
-                       if (cpu_online(j))
-                               seq_printf(p, "CPU%d       ",j);
+               for_each_online_cpu(j)
+                       seq_printf(p, "CPU%d       ", j);
                seq_putc(p, '\n');
        }
 
        if (i < NR_IRQS) {
-               spin_lock_irqsave(&irq_desc[i].lock, flags);
+               raw_spin_lock_irqsave(&irq_desc[i].lock, flags);
                action = irq_desc[i].action;
                if (!action)
                        goto skip;
-               seq_printf(p, "%3d: ",i);
+               seq_printf(p, "%3d: ", i);
 #ifndef CONFIG_SMP
                seq_printf(p, "%10u ", kstat_irqs(i));
 #else
-               for (j = 0; j < NR_CPUS; j++)
-                       if (cpu_online(j))
-                               seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
+               for_each_online_cpu(j)
+                       seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
 #endif
-               seq_printf(p, " %14s", irq_desc[i].handler->typename);
+               seq_printf(p, " %14s", irq_desc[i].chip->name);
                seq_printf(p, "  %s", action->name);
 
                for (action=action->next; action; action = action->next)
@@ -95,7 +118,7 @@ int show_interrupts(struct seq_file *p, void *v)
 
                seq_putc(p, '\n');
 skip:
-               spin_unlock_irqrestore(&irq_desc[i].lock, flags);
+               raw_spin_unlock_irqrestore(&irq_desc[i].lock, flags);
        } else if (i == NR_IRQS) {
                seq_putc(p, '\n');
                seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
@@ -103,38 +126,27 @@ skip:
        return 0;
 }
 
-#ifdef CONFIG_KGDB
-extern void breakpoint(void);
-extern void set_debug_traps(void);
-
-static int kgdb_flag = 1;
-static int __init nokgdb(char *str)
+asmlinkage void spurious_interrupt(void)
 {
-       kgdb_flag = 0;
-       return 1;
+       atomic_inc(&irq_err_count);
 }
-__setup("nokgdb", nokgdb);
-#endif
 
 void __init init_IRQ(void)
 {
        int i;
 
-       for (i = 0; i < NR_IRQS; i++) {
-               irq_desc[i].status  = IRQ_DISABLED;
-               irq_desc[i].action  = NULL;
-               irq_desc[i].depth   = 1;
-               irq_desc[i].handler = &no_irq_type;
-               spin_lock_init(&irq_desc[i].lock);
-       }
+#ifdef CONFIG_KGDB
+       if (kgdb_early_setup)
+               return;
+#endif
+
+       for (i = 0; i < NR_IRQS; i++)
+               set_irq_noprobe(i);
 
        arch_init_irq();
 
 #ifdef CONFIG_KGDB
-       if (kgdb_flag) {
-               printk("Wait for gdb client connection ...\n");
-               set_debug_traps();
-               breakpoint();
-       }
+       if (!kgdb_early_setup)
+               kgdb_early_setup = 1;
 #endif
 }