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genirq: Add a new generic IPI reservation code to irq core

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Add a generic mechanism to dynamically allocate an IPI. Depending on the
underlying implementation this creates either a single Linux irq or a
consective range of Linux irqs. The Linux irq is used later to send IPIs to
other CPUs.

[ tglx: Massaged the code and removed the 'consecutive mask' restriction for
  	the single IRQ case ]

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/1449580830-23652-9-git-send-email-qais.yousef@imgtec.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Qais Yousef 2015-12-08 13:20:19 +00:00 • committed by Thomas Gleixner
parent ac0a0cd266
commit d17bf24e69
4 changed files with 146 additions and 0 deletions
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3
include/linux/irq.h
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@ -940,4 +940,7 @@ static inline u32 irq_reg_readl(struct irq_chip_generic *gc,
return readl(gc->reg_base + reg_offset);
}
/* Contrary to Linux irqs, for hardware irqs the irq number 0 is valid */
#define INVALID_HWIRQ (~0UL)
#endif /* _LINUX_IRQ_H */