From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161622AbcE3Nh4 (ORCPT ); Mon, 30 May 2016 09:37:56 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:32658 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751137AbcE3Nhy (ORCPT ); Mon, 30 May 2016 09:37:54 -0400 Message-Id: <201605301337.u4UDY3Pl026684@mx0a-001b2d01.pphosted.com> X-IBM-Helo: d23dlp01.au.ibm.com X-IBM-MailFrom: xyjxie@linux.vnet.ibm.com X-IBM-RcptTo: kvm@vger.kernel.org;linux-kernel@vger.kernel.org;linux-pci@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, alistair@popple.id.au, ruscur@russell.cc, kevin.tian@intel.com, David.Laight@ACULAB.COM Subject: [PATCH v2 2/6] PCI: Set PCI_BUS_FLAGS_MSI_REMAP if MSI controller enables IRQ remapping Date: Mon, 30 May 2016 21:32:09 +0800 X-Mailer: git-send-email 1.7.1 In-Reply-To: <1464615133-12050-1-git-send-email-xyjxie@linux.vnet.ibm.com> References: <1464615133-12050-1-git-send-email-xyjxie@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16053013-0028-0000-0000-0000018B4708 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16053013-0029-0000-0000-000045D699A0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-05-30_07:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=7 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1604210000 definitions=main-1605300165 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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] https://www.mail-archive.com/linux-kernel%40vger.kernel.org/msg1138820.html Signed-off-by: Yongji Xie --- drivers/pci/msi.c | 15 +++++++++++++++ drivers/pci/probe.c | 3 +++ include/linux/msi.h | 5 ++++- 3 files changed, 22 insertions(+), 1 deletion(-) diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index a080f44..dbdb5c3 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -1134,6 +1134,21 @@ void *msi_desc_to_pci_sysdata(struct msi_desc *desc) } EXPORT_SYMBOL_GPL(msi_desc_to_pci_sysdata); +int pci_bus_msi_isolated(struct pci_bus *bus, struct irq_domain *domain) +{ +#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN + struct msi_domain_info *info; + + if (!domain) + return 0; + + info = msi_get_domain_info(domain); + if (info->flags & MSI_FLAG_IRQ_REMAPPING) + return 1; +#endif + return 0; +} + #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 8004f67..2b9e3ba 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -713,6 +713,9 @@ static void pci_set_bus_msi_domain(struct pci_bus *bus) if (!d) d = pci_host_bridge_msi_domain(b); + if (b == bus && pci_bus_msi_isolated(bus, d)) + bus->bus_flags |= PCI_BUS_FLAGS_MSI_REMAP; + dev_set_msi_domain(&bus->dev, d); } diff --git a/include/linux/msi.h b/include/linux/msi.h index 08441b1..04cc749 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); @@ -164,6 +166,8 @@ 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); +int pci_bus_msi_isolated(struct pci_bus *bus, struct irq_domain *domain); + struct msi_controller { struct module *owner; struct device *dev; @@ -182,7 +186,6 @@ struct msi_controller { #include #include -struct irq_domain; struct irq_domain_ops; struct irq_chip; struct device_node; -- 1.7.9.5