From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751352AbaKKQLO (ORCPT ); Tue, 11 Nov 2014 11:11:14 -0500 Received: from mga09.intel.com ([134.134.136.24]:12720 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751097AbaKKQLN (ORCPT ); Tue, 11 Nov 2014 11:11:13 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.07,362,1413270000"; d="scan'208";a="635125271" Message-ID: <546234FA.3060501@linux.intel.com> Date: Wed, 12 Nov 2014 00:10:34 +0800 From: Jiang Liu Organization: Intel User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 MIME-Version: 1.0 To: Marc Zyngier , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Thomas Gleixner CC: Bjorn Helgaas , Yingjoe Chen , Will Deacon , Catalin marinas , Mark Rutland Subject: Re: [PATCH 00/15] arm64: PCI/MSI: GICv3 ITS support (stacked domain edition) References: <1415720893-13371-1-git-send-email-marc.zyngier@arm.com> In-Reply-To: <1415720893-13371-1-git-send-email-marc.zyngier@arm.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Marc, Sorry for the late notification. I have heavily reworked the interfaces for MSI irqdomain support based on review comments. Please refer to https://lkml.org/lkml/2014/11/9/88, please give your comments on the new interfaces:) Regards! Gerry On 2014/11/11 23:47, Marc Zyngier wrote: > The GICv3 architecture provides a way to implement support for > MSI/MSI-X using a specific block called the ITS (Interrupt Translation > Service). > > The ITS can be accurately described as "page tables for > interrupts". If you think this sounds scary, you're spot on. It uses a > set of opaque memory tables that are manipulated through commands > (software almost never touches the tables directly). In order to make > it slightly easier to digest, the code has been split into (mostly) > logical units. > > To make things more fun, this relies on Jiang Liu's stacked domain > patch series [1]. In order to make this work, the first three patches > introduce support for stacked MSI domain on arm64 (the first patch is > just a version of a existing patch by Yingjoe Chen, and is only > included here for reference; the following two are the actual > implementation). > > I'd welcome some guidance of this stacked domain support, as this goes > into a slightly different direction compared to what we've had on > 32bit ARM so far (using the setup_irq/teardown_irq methods). > > This has been tested on arm64 with an FVP model, and is based on > 3.18-rc4 + Jiang's p2v5 series + a number of arm64-specific PCI > patches. The whole thing is available at: > > git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git irq/stacked-its > > M. > > [1]: http://lwn.net/Articles/619388/ > > Marc Zyngier (15): > genirq: Add a few more helper funtions to support stacked irq_chip > PCI/MSI: genirq: allow architecture-specific override of flow handler > arm64: MSI: Add support for stacked MSI domain > irqchip: GICv3: Convert to domain hierarchy > irqchip: GICv3: rework redistributor structure > irqchip: GICv3: ITS command queue > irqchip: GICv3: ITS: irqchip implementation > irqchip: GICv3: ITS: LPI allocator > irqchip: GICv3: ITS: tables allocators > irqchip: GICv3: ITS: device allocation and configuration > irqchip: GICv3: ITS: MSI support > irqchip: GICv3: ITS: DT probing and initialization > irqchip: GICv3: ITS: plug ITS init into main GICv3 code > irqchip: GICv3: ITS: enable compilation of the ITS driver > irqchip: GICv3: Binding updates for ITS > > Documentation/devicetree/bindings/arm/gic-v3.txt | 39 + > arch/arm64/Kconfig | 1 + > arch/arm64/include/asm/msi.h | 26 + > arch/arm64/kernel/Makefile | 1 + > arch/arm64/kernel/msi.c | 80 ++ > drivers/irqchip/Kconfig | 5 + > drivers/irqchip/Makefile | 1 + > drivers/irqchip/irq-gic-v3-its.c | 1343 ++++++++++++++++++++++ > drivers/irqchip/irq-gic-v3.c | 163 ++- > drivers/pci/msi.c | 7 +- > include/linux/irq.h | 6 + > include/linux/irqchip/arm-gic-v3.h | 128 +++ > kernel/irq/chip.c | 31 + > 13 files changed, 1790 insertions(+), 41 deletions(-) > create mode 100644 arch/arm64/include/asm/msi.h > create mode 100644 arch/arm64/kernel/msi.c > create mode 100644 drivers/irqchip/irq-gic-v3-its.c >