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0b996fd359
linux/drivers/irqchip
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Marc Zyngier 0b996fd359 irqchip/GIC: Convert to EOImode == 1 
So far, GICv2 has been used with EOImode == 0. The effect of this
mode is to perform the priority drop and the deactivation of the
interrupt at the same time.

While this works perfectly for Linux (we only have a single priority),
it causes issues when an interrupt is forwarded to a guest, and when
we want the guest to perform the EOI itself.

For this case, the GIC architecture provides EOImode == 1, where:
- A write to the EOI register drops the priority of the interrupt
  and leaves it active. Other interrupts at the same priority level
  can now be taken, but the active interrupt cannot be taken again
- A write to the DIR marks the interrupt as inactive, meaning it can
  now be taken again.

We only enable this feature when booted in HYP mode and that
the device-tree reported a suitable CPU interface. Observable behaviour
should remain unchanged.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-and-tested-by: Eric Auger <eric.auger@linaro.org>
Cc: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: <linux-arm-kernel@lists.infradead.org>
Cc: kvmarm@lists.cs.columbia.edu
Cc: Jason Cooper <jason@lakedaemon.net>
Link: http://lkml.kernel.org/r/1440604845-28229-4-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2015-08-27 17:13:49 +02:00
..
exynos-combiner.c drivers/irqchip: Replace pr_warning by pr_warn 2015-07-22 18:37:42 +02:00
irq-armada-370-xp.c irqchip: Use irq_desc_get_xxx() to avoid redundant lookup of irq_desc 2015-07-11 23:14:27 +02:00
irq-atmel-aic5.c irqchip: Appropriate __init annotation for const data 2015-07-27 08:09:38 +02:00
irq-atmel-aic-common.c irqchip: atmel-aic-common: Prevent clobbering of priority when changing IRQ type 2015-01-07 12:41:45 +00:00
irq-atmel-aic-common.h irqchip: atmel-aic: Add irq fixup for RTT block 2014-11-09 04:36:38 +00:00
irq-atmel-aic.c irqchip: Appropriate __init annotation for const data 2015-07-27 08:09:38 +02:00
irq-bcm2835.c irqchip/bcm2835: Add support for being used as a second level controller 2015-08-20 22:38:41 +02:00
irq-bcm2836.c irqchip: Add bcm2836 interrupt controller for Raspberry Pi 2 2015-08-20 22:38:42 +02:00
irq-bcm7038-l1.c irqchip/bcm7038-l1: Consolidate chained IRQ handler install/remove 2015-07-11 23:14:25 +02:00
irq-bcm7120-l2.c irqchip/bcm7120-l2: Fix interrupt status for multiple parent IRQs 2015-07-27 08:09:38 +02:00
irq-brcmstb-l2.c irqchip/brcmstb-l2: Prepare brcmstb_l2_intc_irq_handle for irq argument removal 2015-07-16 22:53:22 +02:00
irq-clps711x.c irqchip: Prepare for local stub header removal 2015-07-11 23:14:23 +02:00
irq-crossbar.c irqchip: Prepare for local stub header removal 2015-07-11 23:14:23 +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 irqchip: Prepare for local stub header removal 2015-07-11 23:14:23 +02:00
irq-gic-common.c irqchip: gic: Simplify gic_configure_irq by using IRQCHIP_SET_TYPE_MASKED 2015-06-05 22:26:33 +02:00
irq-gic-common.h irqchip: gic: Allow interrupt level to be set for PPIs 2015-01-26 11:38:23 +01:00
irq-gic-v2m.c irqchip/GICv2m: Add platform MSI support 2015-07-30 00:14:39 +02:00
irq-gic-v3-its-pci-msi.c irqchip/gicv3-its: Make the PCI/MSI code standalone 2015-07-30 00:14:38 +02:00
irq-gic-v3-its-platform-msi.c irqchip/gicv3-its: Add platform MSI support 2015-07-30 00:14:38 +02:00
irq-gic-v3-its.c irqchip/gicv3-its: Make the PCI/MSI code standalone 2015-07-30 00:14:38 +02:00
irq-gic-v3.c irqchip/GICv3: Don't deactivate interrupts forwarded to a guest 2015-08-27 17:13:49 +02:00
irq-gic.c irqchip/GIC: Convert to EOImode == 1 2015-08-27 17:13:49 +02:00
irq-hip04.c irqchip/gic: Enable SKIP_SET_WAKE and MASK_ON_SUSPEND 2015-07-27 08:09:37 +02:00
irq-i8259.c irqchip/i8259: Prepare i8259_irq_dispatch for irq argument removal 2015-07-31 22:20:04 +02:00
irq-imgpdc.c irqchip/imgpdc: Prepare pdc_intc_perip_isr for irq argument removal 2015-07-16 22:53:22 +02:00
irq-imx-gpcv2.c irqchip/imx-gpcv2: IMX GPCv2 driver for wakeup sources 2015-08-24 21:49:34 +02:00
irq-ingenic.c irqchip: Prepare for local stub header removal 2015-07-11 23:14:23 +02:00
irq-keystone.c irqchip/keystone: Prepare keystone_irq_handler for irq argument removal 2015-07-16 22:53:22 +02:00
irq-metag-ext.c irqchip/metag-ext: Use irq_set_chip_handler_name_locked() 2015-07-12 09:39:11 +02:00
irq-metag.c irqchip/metag: Consolidate chained IRQ handler install/remove 2015-07-11 23:14:26 +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 Merge branch 'linus' into irq/core 2015-07-30 00:13:24 +02:00
irq-mmp.c irqchip/mmp: Prepare icu_mux_irq_demux for irq argument removal 2015-07-16 22:53:22 +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: Prepare for local stub header removal 2015-07-11 23:14:23 +02:00
irq-mxs.c irqchip: Prepare for local stub header removal 2015-07-11 23:14:23 +02:00
irq-nvic.c irqchip: Prepare for local stub header removal 2015-07-11 23:14:23 +02:00
irq-omap-intc.c irqchip: omap-intc: Improve IRQ handler 2015-07-22 18:37:42 +02:00
irq-or1k-pic.c irqchip: Prepare for local stub header removal 2015-07-11 23:14:23 +02:00
irq-orion.c irqchip: Use irq_desc_get_xxx() to avoid redundant lookup of irq_desc 2015-07-11 23:14:27 +02:00
irq-renesas-h8s.c irqchip: Prepare for local stub header removal 2015-07-11 23:14:23 +02:00
irq-renesas-h8300h.c irqchip: Prepare for local stub header removal 2015-07-11 23:14:23 +02:00
irq-renesas-intc-irqpin.c irqchip: Constify irq_domain_ops 2015-05-05 10:45:58 +02:00
irq-renesas-irqc.c irqchip/renesas-irqc: Make use of irq_find_mapping() 2015-07-20 13:19:00 +02:00
irq-s3c24xx.c irqchip/s3c24xx: Prepare s3c_irq_demux for irq argument removal 2015-07-16 22:53:22 +02:00
irq-sa11x0.c Merge branch 'sa1100' into for-next 2015-06-12 21:18:13 +01:00
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: Prepare for local stub header removal 2015-07-11 23:14:23 +02:00
irq-sunxi-nmi.c irqchip: Use irq_desc_get_xxx() to avoid redundant lookup of irq_desc 2015-07-11 23:14:27 +02:00
irq-tb10x.c irqchip/tb10x: Prepare tb10x_irq_cascade for irq argument removal 2015-07-16 22:53:22 +02:00
irq-tegra.c irqchip: Prepare for local stub header removal 2015-07-11 23:14:23 +02:00
irq-versatile-fpga.c irqchip/versatile-fpga: Prepare fpga_irq_handle for irq argument removal 2015-07-16 22:53:23 +02:00
irq-vf610-mscm-ir.c irqchip: Prepare for local stub header removal 2015-07-11 23:14:23 +02:00
irq-vic.c irqchip/vic: Consolidate chained IRQ handler install/remove 2015-07-11 23:14:27 +02:00
irq-vt8500.c irqchip/vt8500: Use irq_set_handler_locked() 2015-07-12 09:37:47 +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: Prepare for local stub header removal 2015-07-11 23:14:23 +02:00
irqchip.c irqchip: Add GICv2 specific ACPI boot support 2015-03-26 15:13:07 +00:00
Kconfig irqchip/imx-gpcv2: IMX GPCv2 driver for wakeup sources 2015-08-24 21:49:34 +02:00
Makefile irqchip/imx-gpcv2: IMX GPCv2 driver for wakeup sources 2015-08-24 21:49:34 +02:00
spear-shirq.c Merge branch 'linus' into irq/core 2015-07-30 00:13:24 +02:00