This RFC series attempts to implement a generic IPI layer for reserving and sending IPIs. It is based on the discussion in these links https://lkml.org/lkml/2015/8/26/713 https://lkml.org/lkml/2015/9/29/875 In summary. We need a generic IPI layer to allow driver code to send IPIs to coprocessor without caring about implementation details of the underlying controller. Also it will help in making SMP IPI support more generic. The goal is to have a mechanism to dynamically reserve an IPI to destination CPUs and provide a single virq to send an IPI to any of these CPUs using generic irq_send_ipi() API. This v2 addresses the comments from v1 and implements a simpler mapping mechanism and moves the irq_send_ipi() to be part of irqchip instead of irqdomain. The implementation falls more natural and fits into place now (hopefully). So hopefully next series would be non RFC. The only thing I haven't addressed is whether we want to make request_percpu_irq() enable a coprocessor or defer that to the coprocessor itself. This series is based on Linus tree. I couldn't compile test it because MIPS compilation was broken due to other reasons. I expect some brokeness because of the introduction of struct irq_common_data which is not present on the 4.1 tree I was testing my code on before porting it to Linus tip. I will fix these issues and introduce proper accessors for accessing struct ipi_mask given that the concept is approved. I hope my commit messages aren't too terse. Credit goes to Thomas for spec'ing and outlining the proper way to get this new API in. Qais Yousef (14): irq: add new IRQ_DOMAIN_FLAGS_IPI irq: add GENERIC_IRQ_IPI Kconfig symbol irq: add new struct ipi_mask irq: add a new irq_send_ipi() to irq_chip irq: add struct ipi_mask to irq_data irq: add struct ipi_mapping and its helper functions irq: add a new generic IPI reservation code to irq core irq: implement irq_send_ipi MIPS: add support for 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 a IPI hierarchy domain irqchip: mips-gic: implement the new irq_send_ipi irqchip: mips-gic: remove IPI init code 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-gic.c | 64 ----------- arch/mips/kernel/smp-mt.c | 2 +- arch/mips/kernel/smp.c | 117 ++++++++++++++++++++ drivers/irqchip/Kconfig | 2 + drivers/irqchip/irq-mips-gic.c | 225 ++++++++++++++++++++++++--------------- include/linux/irq.h | 43 ++++++++ include/linux/irqchip/mips-gic.h | 3 - include/linux/irqdomain.h | 19 ++++ kernel/irq/Kconfig | 4 + kernel/irq/irqdomain.c | 84 +++++++++++++++ kernel/irq/manage.c | 103 ++++++++++++++++++ 16 files changed, 517 insertions(+), 169 deletions(-) delete mode 100644 arch/mips/kernel/smp-gic.c -- 2.1.0
