Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752937AbcD0Mqa (ORCPT ); Wed, 27 Apr 2016 08:46:30 -0400 Received: from e28smtp04.in.ibm.com ([125.16.236.4]:57078 "EHLO e28smtp04.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752833AbcD0Mq2 (ORCPT ); Wed, 27 Apr 2016 08:46:28 -0400 X-IBM-Helo: d28relay02.in.ibm.com X-IBM-MailFrom: xyjxie@linux.vnet.ibm.com X-IBM-RcptTo: linux-pci@vger.kernel.org;linux-kernel@vger.kernel.org;kvm@vger.kernel.org From: Yongji Xie To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, iommu@lists.linux-foundation.org Cc: alex.williamson@redhat.com, bhelgaas@google.com, aik@ozlabs.ru, benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au, joro@8bytes.org, warrier@linux.vnet.ibm.com, zhong@linux.vnet.ibm.com, nikunj@linux.vnet.ibm.com, eric.auger@linaro.org, will.deacon@arm.com, gwshan@linux.vnet.ibm.com, David.Laight@ACULAB.COM, alistair@popple.id.au, ruscur@russell.cc, Yongji Xie Subject: [PATCH 3/5] PCI: Set PCI_BUS_FLAGS_MSI_REMAP if MSI controller supports IRQ remapping Date: Wed, 27 Apr 2016 20:43:28 +0800 Message-Id: <1461761010-5452-4-git-send-email-xyjxie@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1461761010-5452-1-git-send-email-xyjxie@linux.vnet.ibm.com> References: <1461761010-5452-1-git-send-email-xyjxie@linux.vnet.ibm.com> X-TM-AS-MML: disable x-cbid: 16042712-0013-0000-0000-00000C014271 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2590 Lines: 87 On ARM HW the capability of IRQ remapping is abstracted on MSI controller side. MSI_FLAG_IRQ_REMAPPING is used to advertise this [1]. To have a universal flag to test this capability for different archs on PCI side, we set PCI_BUS_FLAGS_MSI_REMAP for PCI buses when MSI_FLAG_IRQ_REMAPPING is set. [1] http://www.spinics.net/lists/kvm/msg130256.html Signed-off-by: Yongji Xie --- drivers/pci/msi.c | 12 ++++++++++++ drivers/pci/probe.c | 3 +++ include/linux/msi.h | 6 +++++- 3 files changed, 20 insertions(+), 1 deletion(-) diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index a080f44..1661cdf 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -1134,6 +1134,18 @@ void *msi_desc_to_pci_sysdata(struct msi_desc *desc) } EXPORT_SYMBOL_GPL(msi_desc_to_pci_sysdata); +void pci_bus_check_msi_remapping(struct pci_bus *bus, + struct irq_domain *domain) +{ +#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN + struct msi_domain_info *info; + + info = msi_get_domain_info(domain); + if (info->flags & MSI_FLAG_IRQ_REMAPPING) + bus->bus_flags |= PCI_BUS_FLAGS_MSI_REMAP; +#endif +} + #ifdef CONFIG_PCI_MSI_IRQ_DOMAIN /** * pci_msi_domain_write_msg - Helper to write MSI message to PCI config space diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 6d7ab9b..25cf1b1 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -696,6 +696,9 @@ static void pci_set_bus_msi_domain(struct pci_bus *bus) if (!d) d = pci_host_bridge_msi_domain(b); + if (d && b == bus) + pci_bus_check_msi_remapping(bus, d); + dev_set_msi_domain(&bus->dev, d); } diff --git a/include/linux/msi.h b/include/linux/msi.h index 03eda72..b4c649e 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -15,6 +15,8 @@ extern int pci_msi_ignore_mask; struct irq_data; struct msi_desc; struct pci_dev; +struct pci_bus; +struct irq_domain; struct platform_msi_priv_data; void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg); void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg); @@ -155,6 +157,9 @@ void arch_restore_msi_irqs(struct pci_dev *dev); void default_teardown_msi_irqs(struct pci_dev *dev); void default_restore_msi_irqs(struct pci_dev *dev); +void pci_bus_check_msi_remapping(struct pci_bus *bus, + struct irq_domain *domain); + struct msi_controller { struct module *owner; struct device *dev; @@ -173,7 +178,6 @@ struct msi_controller { #include #include -struct irq_domain; struct irq_domain_ops; struct irq_chip; struct device_node; -- 1.7.9.5