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9e2c986cb4
linux/drivers/irqchip
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Marc Zyngier 9e2c986cb4 irqchip: Add per-cpu interrupt partitioning library 
We've unfortunately started seeing a situation where percpu interrupts
are partitioned in the system: one arbitrary set of CPUs has an
interrupt connected to a type of device, while another disjoint
set of CPUs has the same interrupt connected to another type of device.

This makes it impossible to have a device driver requesting this interrupt
using the current percpu-interrupt abstraction, as the same interrupt number
is now potentially claimed by at least two drivers, and we forbid interrupt
sharing on per-cpu interrupt.

A solution to this is to turn things upside down. Let's assume that our
system describes all the possible partitions for a given interrupt, and
give each of them a unique identifier. It is then possible to create
a namespace where the affinity identifier itself is a form of interrupt
number. At this point, it becomes easy to implement a set of partitions
as a cascaded irqchip, each affinity identifier being the HW irq.

This allows us to keep a number of nice properties:
- Each partition results in a separate percpu-interrupt (with a restrictied
  affinity), which keeps drivers happy.
- Because the underlying interrupt is still per-cpu, the overhead of
  the indirection can be kept pretty minimal.
- The core code can ignore most of that crap.

For that purpose, we implement a small library that deals with some of
the boilerplate code, relying on platform-specific drivers to provide
a description of the affinity sets and a set of callbacks.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Rob Herring <robh+dt@kernel.org>
Link: http://lkml.kernel.org/r/1460365075-7316-4-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2016-05-02 13:42:51 +02:00
..
alphascale_asm9260-icoll.h irqchip/mxs: Add Alphascale ASM9260 support 2015-10-14 09:37:47 +02:00
exynos-combiner.c irqdomain: Use irq_domain_get_of_node() instead of direct field access 2015-10-13 19:01:23 +02:00
irq-alpine-msi.c irqchip/irq-alpine-msi: Release the correct domain on error 2016-03-11 10:06:55 +01:00
irq-armada-370-xp.c irqchip/armada-370-xp: Allow allocation of multiple MSIs 2016-02-16 17:36:16 +00:00
irq-ath79-cpu.c irqchip/ath79-cpu: Move the CPU IRQ driver from arch/mips/ath79/ 2016-02-17 13:47:19 +00:00
irq-ath79-misc.c irqchip/ath79-misc: Move the MISC driver from arch/mips/ath79/ 2016-02-17 13:44:31 +00:00
irq-atmel-aic5.c irqchip/atmel-aic: Remove duplicate bit operation 2016-02-08 15:03:42 +01:00
irq-atmel-aic-common.c irqchip/atmel-aic: Change return type of aic_common_set_priority() 2016-02-08 15:03:42 +01:00
irq-atmel-aic-common.h irqchip/atmel-aic: Change return type of aic_common_set_priority() 2016-02-08 15:03:42 +01:00
irq-atmel-aic.c irqchip/atmel-aic: Change return type of aic_common_set_priority() 2016-02-08 15:03:42 +01:00
irq-bcm2835.c irqchip: Kill off set_irq_flags usage 2015-09-16 16:53:38 +02:00
irq-bcm2836.c irqchip/bcm2836: Drop extra memory barrier in SMP boot. 2016-02-18 01:53:10 +00:00
irq-bcm6345-l1.c irqchips/bmips: Add bcm6345-l1 interrupt controller 2016-02-08 15:03:42 +01:00
irq-bcm7038-l1.c genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
irq-bcm7120-l2.c genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
irq-brcmstb-l2.c genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
irq-clps711x.c irqchip: Kill off set_irq_flags usage 2015-09-16 16:53:38 +02:00
irq-crossbar.c irqchip: Convert all alloc/xlate users from of_node to fwnode 2015-10-13 19:01:23 +02:00
irq-digicolor.c irqchip: Prepare for local stub header removal 2015-07-11 23:14:23 +02:00
irq-dw-apb-ictl.c genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
irq-gic-common.c irqchip/gic: Make sure all interrupts are deactivated at boot 2015-11-17 14:25:58 +01:00
irq-gic-common.h irqchip/gicv3-its: Add HW revision detection and configuration 2015-09-29 10:10:53 +02:00
irq-gic-realview.c irqchip/gic/realview: Support more RealView DCC variants 2016-03-09 09:38:05 +00:00
irq-gic-v2m.c irqchip/gic: Return IRQ_SET_MASK_OK_DONE in the set_affinity method 2016-02-19 15:42:29 +00:00
irq-gic-v3-its-pci-msi.c irqchip/gic-v3-its: Add handling of PCI requester id. 2015-10-16 13:07:13 +01:00
irq-gic-v3-its-platform-msi.c irqchip/gic-v3-its: Parse new version of msi-parent property 2015-10-16 13:07:15 +01:00
irq-gic-v3-its.c irqchip/gic-v3-its: Mark its_init() and its children as __init 2016-03-09 02:44:03 +00:00
irq-gic-v3.c irqchip/gic-v3: Always return IRQ_SET_MASK_OK_DONE in gic_set_affinity 2016-03-09 09:37:37 +00:00
irq-gic.c Merge branch 'linus' into irq/core, to pick up fixes 2016-03-08 12:26:07 +01:00
irq-hip04.c irqdomain: Use irq_domain_get_of_node() instead of direct field access 2015-10-13 19:01:23 +02:00
irq-i8259.c irqchip/i8259: Convert to use irq_set_chained_handler_and_data 2015-10-01 16:32:54 +02:00
irq-imgpdc.c genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
irq-imx-gpcv2.c irqchip: Convert all alloc/xlate users from of_node to fwnode 2015-10-13 19:01:23 +02:00
irq-ingenic.c irqchip: Prepare for local stub header removal 2015-07-11 23:14:23 +02:00
irq-keystone.c irqchip: Kill off set_irq_flags usage 2015-09-16 16:53:38 +02:00
irq-mbigen.c irqchip/mbigen: Handle multiple device nodes in a mbigen module 2016-03-21 11:24:11 +01:00
irq-metag-ext.c genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
irq-metag.c genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
irq-mips-cpu.c irqchip: Prepare for local stub header removal 2015-07-11 23:14:23 +02:00
irq-mips-gic.c irqchip/mips-gic: Don't overrun pcpu_masks array 2016-04-21 21:04:29 +02:00
irq-mmp.c irqchip: Kill off set_irq_flags usage 2015-09-16 16:53:38 +02:00
irq-moxart.c irqchip: Prepare for local stub header removal 2015-07-11 23:14:23 +02:00
irq-mtk-sysirq.c irqchip: Convert all alloc/xlate users from of_node to fwnode 2015-10-13 19:01:23 +02:00
irq-mvebu-odmi.c irqchip/gic: Return IRQ_SET_MASK_OK_DONE in the set_affinity method 2016-02-19 15:42:29 +00:00
irq-mxs.c irqchip/mxs: Fix error check of of_io_request_and_map() 2016-03-10 16:03:30 +01:00
irq-nvic.c irqchip: Convert all alloc/xlate users from of_node to fwnode 2015-10-13 19:01:23 +02:00
irq-omap-intc.c irqchip/omap-intc: Add support for spurious irq handling 2016-01-06 11:35:13 +01:00
irq-or1k-pic.c irqchip: Prepare for local stub header removal 2015-07-11 23:14:23 +02:00
irq-orion.c genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
irq-partition-percpu.c irqchip: Add per-cpu interrupt partitioning library 2016-05-02 13:42:51 +02:00
irq-pic32-evic.c IRQCHIP: irq-pic32-evic: Add support for PIC32 interrupt controller 2016-01-24 02:52:20 +01:00
irq-renesas-h8s.c irqchip: renesas-h8s: Replace ctrl_outw/ctrl_inw with writew/readw 2016-01-20 22:44:13 +09:00
irq-renesas-h8300h.c h8300: Rename ctlr_out/in[bwl] to raw_read/write[bwl] 2015-12-15 10:12:03 +01:00
irq-renesas-intc-irqpin.c irqchip/renesas-intc-irqpin: Improve clock error handling and reporting 2015-11-24 16:54:19 +00:00
irq-renesas-irqc.c irqchip/renesas-irqc: Move over to nested generic chip 2015-09-29 20:41:00 +02:00
irq-s3c24xx.c irqchip/s3c24xx: Mark init_eint as __maybe_unused 2016-01-26 16:00:14 +01:00
irq-sa11x0.c ARM: kill off set_irq_flags usage 2015-07-28 13:58:13 +02:00
irq-sirfsoc.c irqchip: Prepare for local stub header removal 2015-07-11 23:14:23 +02:00
irq-st.c irqchip: st: Supply new driver for STi based devices 2015-03-03 19:48:53 +00:00
irq-sun4i.c irqchip/sun4i: Fix compilation outside of arch/arm 2016-02-02 15:46:40 +01:00
irq-sunxi-nmi.c irqchip/sunxi-nmi: Fix error check of of_io_request_and_map() 2016-03-10 16:03:30 +01:00
irq-tango.c irqchip/tango: Add support for Sigma Designs SMP86xx/SMP87xx interrupt controller 2016-02-18 01:18:14 +00:00
irq-tb10x.c genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
irq-tegra.c irqchip/tegra: Switch to use irq_domain_free_irqs_common 2016-03-20 20:08:28 +01:00
irq-ts4800.c irqchip/ts4800: Make ts4800_ic_ops static const 2016-02-18 02:09:18 +00:00
irq-versatile-fpga.c irqchip/versatile-fpga: Fix PCI IRQ mapping on Versatile PB 2015-12-01 22:50:16 +01:00
irq-vf610-mscm-ir.c irqchip: Convert all alloc/xlate users from of_node to fwnode 2015-10-13 19:01:23 +02:00
irq-vic.c irqchip: Kill off set_irq_flags usage 2015-09-16 16:53:38 +02:00
irq-vt8500.c irqchip: Kill off set_irq_flags usage 2015-09-16 16:53:38 +02:00
irq-xtensa-mx.c irqchip: Prepare for local stub header removal 2015-07-11 23:14:23 +02:00
irq-xtensa-pic.c irqchip: Prepare for local stub header removal 2015-07-11 23:14:23 +02:00
irq-zevio.c irqchip/zevio: Use irq_data_get_chip_type() helper 2015-12-30 18:29:02 +01:00
irqchip.c irqchip / GIC: Convert the GIC driver to ACPI probing 2015-10-01 02:18:38 +02:00
Kconfig irqchip: Add per-cpu interrupt partitioning library 2016-05-02 13:42:51 +02:00
Makefile irqchip: Add per-cpu interrupt partitioning library 2016-05-02 13:42:51 +02:00
spear-shirq.c irqchip: Kill off set_irq_flags usage 2015-09-16 16:53:38 +02:00