Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752004AbaJTRWO (ORCPT ); Mon, 20 Oct 2014 13:22:14 -0400 Received: from service87.mimecast.com ([91.220.42.44]:49188 "EHLO service87.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751347AbaJTRWI convert rfc822-to-8bit (ORCPT ); Mon, 20 Oct 2014 13:22:08 -0400 Date: Mon, 20 Oct 2014 18:21:58 +0100 From: Lorenzo Pieralisi To: Yijing Wang Cc: Bjorn Helgaas , "linux-pci@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "huxinwei@huawei.com" , Wuyun , "linux-arm-kernel@lists.infradead.org" , Russell King , "linux-arch@vger.kernel.org" , "arnab.basu@freescale.com" , "Bharat.Bhushan@freescale.com" , "x86@kernel.org" , Arnd Bergmann , Thomas Gleixner , Konrad Rzeszutek Wilk , "xen-devel@lists.xenproject.org" , Joerg Roedel , "iommu@lists.linux-foundation.org" , "linux-mips@linux-mips.org" , Benjamin Herrenschmidt , "linuxppc-dev@lists.ozlabs.org" , "linux-s390@vger.kernel.org" , Sebastian Ott , Tony Luck , "linux-ia64@vger.kernel.org" , "David S. Miller" , "sparclinux@vger.kernel.org" , Chris Metcalf , Ralf Baechle , Lucas Stach , David Vrabel , Sergei Shtylyov , Michael Ellerman , Thierry Reding , Thomas Petazzoni , Liviu Dudau Subject: Re: [PATCH v3 04/27] arm/MSI: Save MSI chip in pci_sys_data Message-ID: <20141020172158.GA8017@e102568-lin.cambridge.arm.com> References: <1413342435-7876-1-git-send-email-wangyijing@huawei.com> <1413342435-7876-5-git-send-email-wangyijing@huawei.com> MIME-Version: 1.0 In-Reply-To: <1413342435-7876-5-git-send-email-wangyijing@huawei.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-OriginalArrivalTime: 20 Oct 2014 17:22:02.0948 (UTC) FILETIME=[5D268040:01CFEC8A] X-MC-Unique: 114102018220404401 Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: 8BIT Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Oct 15, 2014 at 04:06:52AM +0100, Yijing Wang wrote: > Saving msi chip in pci_sys_data can make pci bus and > devices don't need to know msi chip detail, it also > make pci enumeration code be decoupled from msi chip. > In fact, all pci devices under the same pci hostbridge > share same msi chip. So msi chip should be seen as one > of resources or attributes to be initialized in pci host > bridge driver. Currently, pci hostbridge drivers create > pci_host_bridge in pci_create_root_bus(), and pass arch > specific pci sysdata to core pci scan functions. So pci > arch sysdata is good place to save msi chip. > > Signed-off-by: Yijing Wang > --- > arch/arm/include/asm/mach/pci.h | 6 ++++++ > arch/arm/include/asm/pci.h | 9 +++++++++ > arch/arm/kernel/bios32.c | 3 +++ > drivers/pci/msi.c | 6 ++++++ > include/linux/pci.h | 9 +++++++++ > 5 files changed, 33 insertions(+), 0 deletions(-) > > diff --git a/arch/arm/include/asm/mach/pci.h b/arch/arm/include/asm/mach/pci.h > index 7fc4278..59b0d87 100644 > --- a/arch/arm/include/asm/mach/pci.h > +++ b/arch/arm/include/asm/mach/pci.h > @@ -22,6 +22,9 @@ struct hw_pci { > #ifdef CONFIG_PCI_DOMAINS > int domain; > #endif > +#ifdef CONFIG_PCI_MSI > + struct msi_chip *msi_chip; > +#endif > struct pci_ops *ops; > int nr_controllers; > void **private_data; > @@ -47,6 +50,9 @@ struct pci_sys_data { > #ifdef CONFIG_PCI_DOMAINS > int domain; > #endif > +#ifdef CONFIG_PCI_MSI > + struct msi_chip *msi_chip; > +#endif This struct is defined for ARM only. We are trying to remove dependency on it so that we can have a single driver for ARM32 and ARM64 systems without pcibios dependency. Why can't we add this msi chip data to the host bridge struct instead ? I understand it is all a matter of how to pass the pointer to pci_scan_root_bus(), where the bridge is created. We could initialize the msi chip on the bridge through the bus pointer returned by the pci_scan_root_bus() function. Thanks, Lorenzo > struct list_head node; > int busnr; /* primary bus number */ > u64 mem_offset; /* bus->cpu memory mapping offset */ > diff --git a/arch/arm/include/asm/pci.h b/arch/arm/include/asm/pci.h > index 7e95d85..b562c09 100644 > --- a/arch/arm/include/asm/pci.h > +++ b/arch/arm/include/asm/pci.h > @@ -31,6 +31,15 @@ static inline int pci_proc_domain(struct pci_bus *bus) > } > #endif /* CONFIG_PCI_DOMAINS */ > > +#ifdef CONFIG_PCI_MSI > +static inline struct msi_chip *pci_msi_chip(struct pci_bus *bus) > +{ > + struct pci_sys_data *root = bus->sysdata; > + > + return root->msi_chip; > +} > +#endif > + > /* > * The PCI address space does equal the physical memory address space. > * The networking and block device layers use this boolean for bounce > diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c > index 17a26c1..a19038d 100644 > --- a/arch/arm/kernel/bios32.c > +++ b/arch/arm/kernel/bios32.c > @@ -471,6 +471,9 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw, > #ifdef CONFIG_PCI_DOMAINS > sys->domain = hw->domain; > #endif > +#ifdef CONFIG_PCI_MSI > + sys->msi_chip = hw->msi_chip; > +#endif > sys->busnr = busnr; > sys->swizzle = hw->swizzle; > sys->map_irq = hw->map_irq; > diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c > index 22e413c..f11108c 100644 > --- a/drivers/pci/msi.c > +++ b/drivers/pci/msi.c > @@ -35,6 +35,9 @@ int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc) > struct msi_chip *chip = dev->bus->msi; > int err; > > + if (!chip) > + chip = pci_msi_chip(dev->bus); > + > if (!chip || !chip->setup_irq) > return -EINVAL; > > @@ -50,6 +53,9 @@ void __weak arch_teardown_msi_irq(unsigned int irq) > struct msi_desc *entry = irq_get_msi_desc(irq); > struct msi_chip *chip = entry->dev->bus->msi; > > + if (!chip) > + chip = pci_msi_chip(entry->dev->bus); > + > if (!chip || !chip->teardown_irq) > return; > > diff --git a/include/linux/pci.h b/include/linux/pci.h > index 9cd2721..7a48b40 100644 > --- a/include/linux/pci.h > +++ b/include/linux/pci.h > @@ -1433,6 +1433,15 @@ static inline int pci_get_new_domain_nr(void) { return -ENOSYS; } > > #include > > +/* Just avoid compile error, will be clean up later */ > +#ifdef CONFIG_PCI_MSI > + > +#ifndef pci_msi_chip > +#define pci_msi_chip(bus) NULL > +#endif > + > +#endif > + > /* these helpers provide future and backwards compatibility > * for accessing popular PCI BAR info */ > #define pci_resource_start(dev, bar) ((dev)->resource[(bar)].start) > -- > 1.7.1 > > -- > 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/ > -- 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/