Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932195AbaLIM6E (ORCPT ); Tue, 9 Dec 2014 07:58:04 -0500 Received: from mga02.intel.com ([134.134.136.20]:54110 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932145AbaLIM6D (ORCPT ); Tue, 9 Dec 2014 07:58:03 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.07,544,1413270000"; d="scan'208";a="650904981" Message-ID: <5486F1D7.9090401@linux.intel.com> Date: Tue, 09 Dec 2014 20:57:59 +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 , Bjorn Helgaas , Thomas Gleixner CC: linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Will Deacon , Yijing Wang , Suravee Suthikulpanit Subject: Re: [PATCH 2/6] PCI/MSI: add hooks to populate the msi_domain field References: <1418069543-21969-1-git-send-email-marc.zyngier@arm.com> <1418069543-21969-3-git-send-email-marc.zyngier@arm.com> In-Reply-To: <1418069543-21969-3-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 On 2014/12/9 4:12, Marc Zyngier wrote: > In order to be able to populate the device msi_domain field, > add the necesary hooks to propagate the PHB msi_domain across > secondary busses to devices. > > So far, nobody populates the initial msi_domain. > > Signed-off-by: Marc Zyngier > --- > drivers/pci/probe.c | 24 ++++++++++++++++++++++++ > include/linux/pci.h | 1 + > 2 files changed, 25 insertions(+) > > diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c > index c8ca98c..d1009a2 100644 > --- a/drivers/pci/probe.c > +++ b/drivers/pci/probe.c > @@ -670,6 +670,20 @@ static void pci_set_bus_speed(struct pci_bus *bus) > } > } > > +void __weak pcibios_set_phb_msi_domain(struct pci_bus *bus) > +{ > +} > + > +static void pci_set_bus_msi_domain(struct pci_bus *bus) > +{ > + struct pci_dev *bridge = bus->self; > + > + if (!bridge) > + pcibios_set_phb_msi_domain(bus); > + else > + dev_set_msi_domain(&bus->dev, dev_get_msi_domain(&bridge->dev)); > +} > + > static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, > struct pci_dev *bridge, int busnr) > { > @@ -723,6 +737,7 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, > bridge->subordinate = child; > > add_dev: > + pci_set_bus_msi_domain(child); > ret = device_register(&child->dev); > WARN_ON(ret < 0); > > @@ -1517,6 +1532,11 @@ static void pci_init_capabilities(struct pci_dev *dev) > pci_enable_acs(dev); > } > > +static void pci_set_msi_domain(struct pci_dev *dev) > +{ > + dev_set_msi_domain(&dev->dev, dev_get_msi_domain(&dev->bus->dev)); > +} > + Hi Marc, The default implementation of pci_set_msi_domain() conflicts with interrupt mapping based on x86 Intel VT-d:( If pci_set_msi_domain() is weak, thing gets perfect. Regards! Gerry > void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) > { > int ret; > @@ -1546,6 +1566,9 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) > /* Initialize various capabilities */ > pci_init_capabilities(dev); > > + /* Setup MSI irq domain */ > + pci_set_msi_domain(dev); > + > /* > * Add the device to our list of discovered devices > * and the bus list for fixup functions, etc. > @@ -1947,6 +1970,7 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus, > b->bridge = get_device(&bridge->dev); > device_enable_async_suspend(b->bridge); > pci_set_bus_of_node(b); > + pci_set_bus_msi_domain(b); > > if (!parent) > set_dev_node(b->bridge, pcibus_to_node(b)); > diff --git a/include/linux/pci.h b/include/linux/pci.h > index a523cee..3266764 100644 > --- a/include/linux/pci.h > +++ b/include/linux/pci.h > @@ -1637,6 +1637,7 @@ int pcibios_set_pcie_reset_state(struct pci_dev *dev, > int pcibios_add_device(struct pci_dev *dev); > void pcibios_release_device(struct pci_dev *dev); > void pcibios_penalize_isa_irq(int irq, int active); > +void pcibios_set_phb_msi_domain(struct pci_bus *bus); > > #ifdef CONFIG_HIBERNATE_CALLBACKS > extern struct dev_pm_ops pcibios_pm_ops; > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/