void hyperv_vector_handler(struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
entering_irq();
inc_irq_stat(irq_hv_callback_count);
if (vmbus_handler)
vmbus_handler();
exiting_irq();
set_irq_regs(old_regs);
}
void hyperv_vector_handler(struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
entering_irq();
inc_irq_stat(irq_hv_callback_count);
if (vmbus_handler)
vmbus_handler();
if (ms_hyperv.hints & HV_X64_DEPRECATING_AEOI_RECOMMENDED)
ack_APIC_irq();
exiting_irq();
set_irq_regs(old_regs);
}
/*
* do_IRQ handles all normal device IRQ's (the special
* SMP cross-CPU interrupts have their own specific
* handlers).
*/
__visible unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
struct irq_desc * desc;
/* high bit used in ret_from_ code */
unsigned vector = ~regs->orig_ax;
/*
* NB: Unlike exception entries, IRQ entries do not reliably
* handle context tracking in the low-level entry code. This is
* because syscall entries execute briefly with IRQs on before
* updating context tracking state, so we can take an IRQ from
* kernel mode with CONTEXT_USER. The low-level entry code only
* updates the context if we came from user mode, so we won't
* switch to CONTEXT_KERNEL. We'll fix that once the syscall
* code is cleaned up enough that we can cleanly defer enabling
* IRQs.
*/
entering_irq();
/* entering_irq() tells RCU that we're not quiescent. Check it. */
RCU_LOCKDEP_WARN(!rcu_is_watching(), "IRQ failed to wake up RCU");
desc = __this_cpu_read(vector_irq[vector]);
if (!handle_irq(desc, regs)) {
ack_APIC_irq();
if (desc != VECTOR_RETRIGGERED) {
pr_emerg_ratelimited("%s: %d.%d No irq handler for vector\n",
__func__, smp_processor_id(),
vector);
} else {
__this_cpu_write(vector_irq[vector], VECTOR_UNUSED);
}
}
exiting_irq();
set_irq_regs(old_regs);
return 1;
}