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[66.111.4.228]) by smtp.gmail.com with ESMTPSA id h15sm5021904ils.46.2021.08.02.01.15.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Aug 2021 01:15:10 -0700 (PDT) Received: from compute1.internal (compute1.nyi.internal [10.202.2.41]) by mailauth.nyi.internal (Postfix) with ESMTP id 5E57027C0054; Mon, 2 Aug 2021 04:15:09 -0400 (EDT) Received: from mailfrontend2 ([10.202.2.163]) by compute1.internal (MEProxy); Mon, 02 Aug 2021 04:15:09 -0400 X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvtddriedugdduuddtucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhepfffhvffukfhfgggtuggjsehttdertddttddvnecuhfhrohhmpeeuohhquhhn ucfhvghnghcuoegsohhquhhnrdhfvghnghesghhmrghilhdrtghomheqnecuggftrfgrth htvghrnhepveeijedthfeijeefudehhedvveegudegteehgffgtddvuedtveegtedvvdef gedtnecuffhomhgrihhnpehkvghrnhgvlhdrohhrghenucevlhhushhtvghrufhiiigvpe dtnecurfgrrhgrmhepmhgrihhlfhhrohhmpegsohhquhhnodhmvghsmhhtphgruhhthhhp vghrshhonhgrlhhithihqdeiledvgeehtdeigedqudejjeekheehhedvqdgsohhquhhnrd hfvghngheppehgmhgrihhlrdgtohhmsehfihigmhgvrdhnrghmvg X-ME-Proxy: Received: by mail.messagingengine.com (Postfix) with ESMTPA; Mon, 2 Aug 2021 04:15:07 -0400 (EDT) Date: Mon, 2 Aug 2021 16:15:04 +0800 From: Boqun Feng To: Bjorn Helgaas , Arnd Bergmann , Marc Zyngier , Lorenzo Pieralisi Cc: Catalin Marinas , Will Deacon , "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Wei Liu , Dexuan Cui , Rob Herring , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org, Sunil Muthuswamy , Mike Rapoport Subject: Re: [PATCH v6 0/8] PCI: hv: Support host bridge probing on ARM64 Message-ID: References: <20210726180657.142727-1-boqun.feng@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210726180657.142727-1-boqun.feng@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 27, 2021 at 02:06:49AM +0800, Boqun Feng wrote: > Hi, > > This is the v6 for the preparation of virtual PCI support on Hyper-V > ARM64, Previous versions: > > v1: https://lore.kernel.org/lkml/20210319161956.2838291-1-boqun.feng@gmail.com/ > v2: https://lore.kernel.org/lkml/20210503144635.2297386-1-boqun.feng@gmail.com/ > v3: https://lore.kernel.org/lkml/20210609163211.3467449-1-boqun.feng@gmail.com/ > v4: https://lore.kernel.org/lkml/20210714102737.198432-1-boqun.feng@gmail.com/ > v5: https://lore.kernel.org/lkml/20210720134429.511541-1-boqun.feng@gmail.com/ > > Changes since last version: > > * Rebase to 5.14-rc3 > > * Comment fixes as suggested by Bjorn. > > The basic problem we need to resolve is that ARM64 is an arch with > PCI_DOMAINS_GENERIC=y, so the bus sysdata is pci_config_window. However, > Hyper-V PCI provides a paravirtualized PCI interface, so there is no > actual pci_config_window for a PCI host bridge, so no information can be > retrieve from the pci_config_window of a Hyper-V virtual PCI bus. Also > there is no corresponding ACPI device for the Hyper-V PCI root bridge, > which introduces a special case when trying to find the ACPI device from > the sysdata (see patch #3). > > With this patchset, we could enable the virtual PCI on Hyper-V ARM64 > guest with other code under development. > > Comments and suggestions are welcome. > Ping ;-) Regards, Boqun > Regards, > Boqun > > Arnd Bergmann (1): > PCI: hv: Generify PCI probing > > Boqun Feng (7): > PCI: Introduce domain_nr in pci_host_bridge > PCI: Support populating MSI domains of root buses via bridges > arm64: PCI: Restructure pcibios_root_bridge_prepare() > arm64: PCI: Support root bridge preparation for Hyper-V > PCI: hv: Set ->domain_nr of pci_host_bridge at probing time > PCI: hv: Set up MSI domain at bridge probing time > PCI: hv: Turn on the host bridge probing on ARM64 > > arch/arm64/kernel/pci.c | 29 +++++++--- > drivers/pci/controller/pci-hyperv.c | 86 +++++++++++++++++------------ > drivers/pci/probe.c | 12 +++- > include/linux/pci.h | 11 ++++ > 4 files changed, 93 insertions(+), 45 deletions(-) > > -- > 2.32.0 >