[PATCH v4 00/19] Implement generic IPI support mechanism

[Qais Yousef]

This series adds support for a generic IPI mechanism that can be used by both
arch and drivers to send IPIs to other CPUs.

v4 is rebased on tip of irq/core and fixes a bug in ipi_send_single() where we
were passing the basevirq irq_data instead of the irq_data for the target cpu.

v3 removed the use of struct ipi_mask and moved to using cpumask only.
The assumption is that the user would need to set NR_CPUS to a suitable value to
cater for coprocessors outside linux SMP range.

We use irq_common_data affinity to store the ipi_mask too. Maybe we need to
separate them later, but I think it can be done safely later if the need arises.

This is boot tested on Malta platform.

Note that of_irq_find_parent() was moved to be static and could cause this patch
series not to compile. The issue was reported and a fix to undo that change
is in the pipeline (in the DT tree I guess).

Thanks,
Qais

Qais Yousef (19):
  genirq: Add new IRQ_DOMAIN_FLAGS_IPI
  genirq: Add DOMAIN_BUS_IPI
  genirq: Add GENERIC_IRQ_IPI Kconfig symbol
  genirq: Add struct ipi_mapping and its helper functions
  genirq: Add ipi_offset to irq_common_data
  genirq: Add an extra comment about the use of affinity in
    irq_common_data
  genirq: Make irq_domain_alloc_descs() non static
  genirq: Add a new generic IPI reservation code to irq core
  genirq: Add a new function to get IPI reverse mapping
  genirq: Add a new irq_send_ipi() to irq_chip
  genirq: Implement ipi_send_{mask, single}()
  irqchip/mips-gic: Add a IPI hierarchy domain
  irqchip/mips-gic: Add device hierarchy domain
  irqchip/mips-gic: Use gic_vpes instead of NR_CPUS
  irqchip/mips-gic: Clear percpu_masks correctly when mapping
  MIPS: Add generic SMP IPI support
  MIPS: Make smp CMP, CPS and MT use the new generic IPI functions
  MIPS: Delete smp-gic.c
  irqchip/mips-gic: Add new DT property to reserve IPIs

 .../bindings/interrupt-controller/mips-gic.txt     |   7 +
 arch/mips/Kconfig                                  |   6 -
 arch/mips/include/asm/smp-ops.h                    |   5 +-
 arch/mips/kernel/Makefile                          |   1 -
 arch/mips/kernel/smp-cmp.c                         |   4 +-
 arch/mips/kernel/smp-cps.c                         |   4 +-
 arch/mips/kernel/smp-mt.c                          |   2 +-
 arch/mips/kernel/smp.c                             | 136 +++++++
 drivers/irqchip/Kconfig                            |   2 +
 drivers/irqchip/irq-mips-gic.c                     | 354 ++++++++++++-----
 include/linux/irq.h                                |  61 ++-
 include/linux/irqchip/mips-gic.h                   |   3 -
 include/linux/irqdomain.h                          |  45 +++
 kernel/irq/Kconfig                                 |   4 +
 kernel/irq/Makefile                                |   1 +
 kernel/irq/ipi.c                                   | 441 +++++++++++++++++++++
 kernel/irq/irqdomain.c                             |   6 +-
 17 files changed, 969 insertions(+), 113 deletions(-)
 create mode 100644 kernel/irq/ipi.c

-- 
2.1.0

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