arch/x86/kernel/irq_work.c

   1 /*
   2  * x86 specific code for irq_work
   3  *
   4  * Copyright (C) 2010 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/irq_work.h>
   9 #include <linux/hardirq.h>
  10 #include <asm/apic.h>
  11 #include <asm/trace/irq_vectors.h>
  12
  13 static inline void irq_work_entering_irq(void)
  14 {
  15         irq_enter();
  16         ack_APIC_irq();
  17 }
  18
  19 static inline void __smp_irq_work_interrupt(void)
  20 {
  21         inc_irq_stat(apic_irq_work_irqs);
  22         irq_work_run();
  23 }
  24
  25 __visible void smp_irq_work_interrupt(struct pt_regs *regs)
  26 {
  27         irq_work_entering_irq();
  28         __smp_irq_work_interrupt();
  29         exiting_irq();
  30 }
  31
  32 __visible void smp_trace_irq_work_interrupt(struct pt_regs *regs)
  33 {
  34         irq_work_entering_irq();
  35         trace_irq_work_entry(IRQ_WORK_VECTOR);
  36         __smp_irq_work_interrupt();
  37         trace_irq_work_exit(IRQ_WORK_VECTOR);
  38         exiting_irq();
  39 }
  40
  41 void arch_irq_work_raise(void)
  42 {
  43 #ifdef CONFIG_X86_LOCAL_APIC
  44         if (!arch_irq_work_has_interrupt())
  45                 return;
  46
  47         apic->send_IPI_self(IRQ_WORK_VECTOR);
  48         apic_wait_icr_idle();
  49 #endif
  50 }