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Subject[RFC Patch V1 0/9] Simplify initialization of IR on x86 platforms
Date
This is a following-on patch set to simplify initialization of interrupt
remapping subsystem on x86 platforms. Please refer to
https://lkml.org/lkml/2014/12/5/114
for the whole story.

With this patch set applied, there are three steps to initialize IR on x86:
1) "Detect" stage to detect ACPI table for IR at early booting stage
2) "Prepare" stage to allocate resources for IR
3) "Enable" stage to program hardware device to enable IR

Patch 1-3 clean up the code to initialize IR and X2APIC on x86
Patch 4-5 kill the irq_remapping_supported() and related code
Patch 6-9 clean up IR code further.

It's based on tip/x86/apic branch and could be pulled from:
https://github.com/jiangliu/linux.git irq_remapping_v1

It has been tested on Intel platform with X2APIC enabled and disabled.
It also passes Fengguang's 0day test suite. Tests on AMD platform are
welcomed!

Jiang Liu (9):
x86, apic: Kill useless variable x2apic_enabled in function
enable_IR_x2apic()
x86, apic: Correctly detect X2APIC status in function enable_IR()
x86, apic: Refine enable_IR_x2apic() and related functions
iommu/vt-d: Prepare for killing function irq_remapping_supported()
iommu/irq_remapping: Kill function irq_remapping_supported() and
related code
iommu/irq_remapping: Refine function irq_remapping_prepare() for
maintenance
iommu/irq_remapping: Change variable disable_irq_remap to be static
iommu/irq_remapping: Normailize the way to detect whether IR is
enabled
iommu/irq_remapping: Kill unused function irq_remapping_print_chip()

arch/x86/include/asm/irq_remapping.h | 4 --
arch/x86/kernel/apic/apic.c | 89 +++++++++++++++-------------------
drivers/iommu/amd_iommu.c | 1 -
drivers/iommu/amd_iommu_init.c | 10 +---
drivers/iommu/amd_iommu_proto.h | 1 -
drivers/iommu/intel_irq_remapping.c | 59 ++++++++--------------
drivers/iommu/irq_remapping.c | 74 +++++++++-------------------
drivers/iommu/irq_remapping.h | 5 --
8 files changed, 84 insertions(+), 159 deletions(-)

--
1.7.10.4



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