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

Qais Yousef
2015-12-08T13:20:55Z

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

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2.1.0