linux.git/kernel/irq/ipi.c, branch v4.6-rc2

genirq: Implement ipi_send_mask/single()

2016-02-25T09:56:57+00:00

Add APIs to send IPIs from driver and arch code.

We have different functions because we allow architecture code to cache the
irq descriptor to avoid lookups. Driver code has to use the irq number and is
subject to more restrictive checks.

[ tglx: Polish the implementation ]

Signed-off-by: Qais Yousef 
Cc: 
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Cc: Qais Yousef 
Link: http://lkml.kernel.org/r/1449580830-23652-12-git-send-email-qais.yousef@imgtec.com
Signed-off-by: Thomas Gleixner

genirq: Add a new function to get IPI reverse mapping

2016-02-25T09:56:56+00:00

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 
Cc: 
Cc: 
Cc: 
Cc: 
Cc: 
Cc: 
Cc: Qais Yousef 
Link: http://lkml.kernel.org/r/1449580830-23652-10-git-send-email-qais.yousef@imgtec.com
Signed-off-by: Thomas Gleixner

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

2016-02-25T09:56:56+00:00

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 
Cc: 
Cc: 
Cc: 
Cc: 
Cc: 
Cc: 
Cc: Qais Yousef 
Link: http://lkml.kernel.org/r/1449580830-23652-9-git-send-email-qais.yousef@imgtec.com
Signed-off-by: Thomas Gleixner