genirq: Add a new function to get IPI reverse mapping

When dealing with coprocessors we need to find out the actual hwirqs values to
pass on to the firmware so that it knows what it needs to use to receive IPIs
from and send IPIs to Linux cpus.

[ tglx: Fixed the single hwirq IPI case. The hardware irq number does not
  	change due to the cpu number ]

Signed-off-by: Qais Yousef <qais.yousef@imgtec.com>
Cc: <jason@lakedaemon.net>
Cc: <marc.zyngier@arm.com>
Cc: <jiang.liu@linux.intel.com>
Cc: <ralf@linux-mips.org>
Cc: <linux-mips@linux-mips.org>
Cc: <lisa.parratt@imgtec.com>
Cc: Qais Yousef <qsyousef@gmail.com>
Link: http://lkml.kernel.org/r/1449580830-23652-10-git-send-email-qais.yousef@imgtec.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/irq.h b/include/linux/irq.h
index 95f4f66f95f3..10273dce058a 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -942,5 +942,6 @@ static inline u32 irq_reg_readl(struct irq_chip_generic *gc,
 
 /* Contrary to Linux irqs, for hardware irqs the irq number 0 is valid */
 #define INVALID_HWIRQ   (~0UL)
+irq_hw_number_t ipi_get_hwirq(unsigned int irq, unsigned int cpu);
 
 #endif /* _LINUX_IRQ_H */