From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jiang Liu Subject: [RFC Patch V1 0/9] Simplify initialization of IR on x86 platforms Date: Wed, 10 Dec 2014 14:47:42 +0800 Message-ID: <1418194071-13785-1-git-send-email-jiang.liu@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: "H. Peter Anvin" , Thomas Gleixner , Joerg Roedel , David Woodhouse , Borislav Petkov Cc: x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, Tony Luck , Jiang Liu , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: iommu@lists.linux-foundation.org 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