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d16mr26169646pfq.54.1569908399623; Mon, 30 Sep 2019 22:39:59 -0700 (PDT) Received: from [10.61.2.175] ([122.99.82.10]) by smtp.gmail.com with ESMTPSA id r24sm13374145pfh.69.2019.09.30.22.39.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Sep 2019 22:39:59 -0700 (PDT) Subject: Re: [PATCH 2/3] powerpc/pci: Fix pcibios_setup_device() ordering To: Oliver O'Halloran , linuxppc-dev@lists.ozlabs.org Cc: shawn@anastas.io, linux-pci@vger.kernel.org References: <20190930020848.25767-1-oohall@gmail.com> <20190930020848.25767-3-oohall@gmail.com> From: Alexey Kardashevskiy Autocrypt: addr=aik@ozlabs.ru; keydata= mQINBE+rT0sBEADFEI2UtPRsLLvnRf+tI9nA8T91+jDK3NLkqV+2DKHkTGPP5qzDZpRSH6mD EePO1JqpVuIow/wGud9xaPA5uvuVgRS1q7RU8otD+7VLDFzPRiRE4Jfr2CW89Ox6BF+q5ZPV /pS4v4G9eOrw1v09lEKHB9WtiBVhhxKK1LnUjPEH3ifkOkgW7jFfoYgTdtB3XaXVgYnNPDFo PTBYsJy+wr89XfyHr2Ev7BB3Xaf7qICXdBF8MEVY8t/UFsesg4wFWOuzCfqxFmKEaPDZlTuR tfLAeVpslNfWCi5ybPlowLx6KJqOsI9R2a9o4qRXWGP7IwiMRAC3iiPyk9cknt8ee6EUIxI6 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DG9EMkK8IBXnLulqVk54kf7fE0jT/d8RTtJIA92GzsgdK2rpT1MBKKVffjRFGwN7nQVOzi4T XrB5p+6ML7Bd84xOEGsj/vdaXmz1esuH7BOZAGEZfLRCHJ0GVCSssg== Message-ID: Date: Tue, 1 Oct 2019 15:39:56 +1000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <20190930020848.25767-3-oohall@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On 30/09/2019 12:08, Oliver O'Halloran wrote: > From: Shawn Anastasio > > Move PCI device setup from pcibios_add_device() and pcibios_fixup_bus() to > pcibios_bus_add_device(). This ensures that platform-specific DMA and IOMMU > setup occurs after the device has been registered in sysfs, which is a > requirement for IOMMU group assignment to work > > This fixes IOMMU group assignment for hotplugged devices on pseries, where > the existing behavior results in IOMMU assignment before registration. > > Thanks to Lukas Wunner for the suggestion. > > Signed-off-by: Shawn Anastasio Tested-by: Alexey Kardashevskiy Reviewed-by: Alexey Kardashevskiy > --- > arch/powerpc/kernel/pci-common.c | 25 +++++++++---------------- > 1 file changed, 9 insertions(+), 16 deletions(-) > > diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c > index 1c448cf..b89925ed 100644 > --- a/arch/powerpc/kernel/pci-common.c > +++ b/arch/powerpc/kernel/pci-common.c > @@ -261,12 +261,6 @@ int pcibios_sriov_disable(struct pci_dev *pdev) > > #endif /* CONFIG_PCI_IOV */ > > -void pcibios_bus_add_device(struct pci_dev *pdev) > -{ > - if (ppc_md.pcibios_bus_add_device) > - ppc_md.pcibios_bus_add_device(pdev); > -} > - > static resource_size_t pcibios_io_size(const struct pci_controller *hose) > { > #ifdef CONFIG_PPC64 > @@ -987,15 +981,17 @@ static void pcibios_setup_device(struct pci_dev *dev) > ppc_md.pci_irq_fixup(dev); > } > > -int pcibios_add_device(struct pci_dev *dev) > +void pcibios_bus_add_device(struct pci_dev *pdev) > { > - /* > - * We can only call pcibios_setup_device() after bus setup is complete, > - * since some of the platform specific DMA setup code depends on it. > - */ > - if (dev->bus->is_added) > - pcibios_setup_device(dev); > + /* Perform platform-specific device setup */ > + pcibios_setup_device(pdev); > + > + if (ppc_md.pcibios_bus_add_device) > + ppc_md.pcibios_bus_add_device(pdev); > +} > > +int pcibios_add_device(struct pci_dev *dev) > +{ > #ifdef CONFIG_PCI_IOV > if (ppc_md.pcibios_fixup_sriov) > ppc_md.pcibios_fixup_sriov(dev); > @@ -1037,9 +1033,6 @@ void pcibios_fixup_bus(struct pci_bus *bus) > > /* Now fixup the bus bus */ > pcibios_setup_bus_self(bus); > - > - /* Now fixup devices on that bus */ > - pcibios_setup_bus_devices(bus); > } > EXPORT_SYMBOL(pcibios_fixup_bus); > > -- Alexey