Messages in this thread | | | From | Marc Zyngier <> | Subject | [PATCH v3 0/3] genirq: handling GIC per-cpu interrupts | Date | Fri, 23 Sep 2011 17:03:05 +0100 |
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The current GIC per-cpu interrupts (aka PPIs) suffer from a number of problems:
- They use a completely separate scheme to handle the interrupts, mostly because the PPI concept doesn't really match the kernel view of an interrupt. - PPIs can only be used by the timer code, unless we add more low-level assembly code. - The local timer code can only be used by devices generating PPIs, and not SPIs. - At least one platform (msm) has started implementing its own alternative scheme. - Some low-level code gets duplicated, as usual...
The proposed solution is to handle the PPIs using the same path as SPIs. A new core API is added to deal with per-cpu interrupts in a less awkward way. The local timer code is updated to reflect these changes.
The core API changes are based on an initial idea by Thomas Gleixner.
Tested on ARM Versatile Express (Cortex A15), ARM RealView PB11MP, OMAP4 (Panda) and Tegra (Harmony). Patch series against next-20110923.
From v2: - Fixed !GENERIC_HARDIRQS build - Fixed request_percpu_irq documentation
From v1: - General tidy-up after Thomas' review. I've kept the config option for the time being until we can sort out the anonymous union problem.
Marc Zyngier (3): genirq: add support for per-cpu dev_id interrupts ARM: gic: consolidate PPI handling ARM: gic, local timers: use the request_percpu_irq() interface
arch/arm/common/Kconfig | 1 + arch/arm/common/gic.c | 38 +++- arch/arm/include/asm/entry-macro-multi.S | 7 - arch/arm/include/asm/hardirq.h | 3 - arch/arm/include/asm/hardware/entry-macro-gic.S | 19 +-- arch/arm/include/asm/hardware/gic.h | 1 - arch/arm/include/asm/localtimer.h | 19 +- arch/arm/include/asm/smp.h | 5 - arch/arm/include/asm/smp_twd.h | 2 +- arch/arm/kernel/irq.c | 3 - arch/arm/kernel/smp.c | 33 +---- arch/arm/kernel/smp_twd.c | 47 +++++- arch/arm/mach-exynos4/include/mach/entry-macro.S | 6 +- arch/arm/mach-exynos4/mct.c | 5 - arch/arm/mach-msm/board-msm8x60.c | 11 - arch/arm/mach-msm/include/mach/entry-macro-qgic.S | 73 +------- arch/arm/mach-msm/timer.c | 69 ++++--- arch/arm/mach-omap2/include/mach/entry-macro.S | 14 +-- arch/arm/mach-shmobile/entry-intc.S | 3 - arch/arm/mach-shmobile/include/mach/entry-macro.S | 3 - include/linux/interrupt.h | 40 +++- include/linux/irq.h | 16 ++- include/linux/irqdesc.h | 1 + kernel/irq/Kconfig | 4 + kernel/irq/chip.c | 54 ++++++ kernel/irq/internals.h | 2 + kernel/irq/irqdesc.c | 25 +++ kernel/irq/manage.c | 206 ++++++++++++++++++++- kernel/irq/settings.h | 7 + 29 files changed, 468 insertions(+), 249 deletions(-)
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