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Wysocki" , Len Brown , =?utf-8?q?Roger_Pau_Monn=C3=A9?= CC: , , , , "Stewart Hildebrand" , Huang Rui , Jiqian Chen , Huang Rui Subject: [RFC KERNEL PATCH v4 3/3] PCI/sysfs: Add gsi sysfs for pci_dev Date: Fri, 5 Jan 2024 14:22:17 +0800 Message-ID: <20240105062217.349645-4-Jiqian.Chen@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240105062217.349645-1-Jiqian.Chen@amd.com> References: <20240105062217.349645-1-Jiqian.Chen@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS2PEPF0000343B:EE_|IA0PR12MB7507:EE_ X-MS-Office365-Filtering-Correlation-Id: 7a331728-29ab-46e1-0d3b-08dc0db6bf8b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(4636009)(376002)(396003)(136003)(39860400002)(346002)(230922051799003)(186009)(82310400011)(64100799003)(451199024)(1800799012)(40470700004)(36840700001)(46966006)(2616005)(336012)(426003)(16526019)(26005)(1076003)(7696005)(6666004)(86362001)(83380400001)(4326008)(316002)(54906003)(110136005)(8676002)(8936002)(7416002)(2906002)(36756003)(5660300002)(478600001)(70206006)(70586007)(82740400003)(81166007)(356005)(47076005)(36860700001)(41300700001)(40460700003)(40480700001)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Jan 2024 06:22:52.7600 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7a331728-29ab-46e1-0d3b-08dc0db6bf8b X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS2PEPF0000343B.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB7507 There is a need for some scenarios to use gsi sysfs. For example, when xen passthrough a device to dumU, it will use gsi to map pirq, but currently userspace can't get gsi number. So, add gsi sysfs for that and for other potential scenarios. Co-developed-by: Huang Rui Signed-off-by: Jiqian Chen --- drivers/acpi/pci_irq.c | 1 + drivers/pci/pci-sysfs.c | 11 +++++++++++ include/linux/pci.h | 2 ++ 3 files changed, 14 insertions(+) diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c index 630fe0a34bc6..739a58755df2 100644 --- a/drivers/acpi/pci_irq.c +++ b/drivers/acpi/pci_irq.c @@ -449,6 +449,7 @@ int acpi_pci_irq_enable(struct pci_dev *dev) kfree(entry); return 0; } + dev->gsi = gsi; rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity); if (rc < 0) { diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 2321fdfefd7d..c51df88d079e 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -71,6 +71,16 @@ static ssize_t irq_show(struct device *dev, } static DEVICE_ATTR_RO(irq); +static ssize_t gsi_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct pci_dev *pdev = to_pci_dev(dev); + + return sysfs_emit(buf, "%u\n", pdev->gsi); +} +static DEVICE_ATTR_RO(gsi); + static ssize_t broken_parity_status_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -596,6 +606,7 @@ static struct attribute *pci_dev_attrs[] = { &dev_attr_revision.attr, &dev_attr_class.attr, &dev_attr_irq.attr, + &dev_attr_gsi.attr, &dev_attr_local_cpus.attr, &dev_attr_local_cpulist.attr, &dev_attr_modalias.attr, diff --git a/include/linux/pci.h b/include/linux/pci.h index dea043bc1e38..0618d4a87a50 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -529,6 +529,8 @@ struct pci_dev { /* These methods index pci_reset_fn_methods[] */ u8 reset_methods[PCI_NUM_RESET_METHODS]; /* In priority order */ + + unsigned int gsi; }; static inline struct pci_dev *pci_physfn(struct pci_dev *dev)