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Received: from DU0PR04MB9417.eurprd04.prod.outlook.com (2603:10a6:10:358::11) by DUZPR04MB9846.eurprd04.prod.outlook.com (2603:10a6:10:4db::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6652.27; Sat, 12 Aug 2023 12:16:49 +0000 Received: from DU0PR04MB9417.eurprd04.prod.outlook.com ([fe80::5d6a:ec53:f2a8:5b97]) by DU0PR04MB9417.eurprd04.prod.outlook.com ([fe80::5d6a:ec53:f2a8:5b97%6]) with mapi id 15.20.6652.025; Sat, 12 Aug 2023 12:16:49 +0000 From: "Peng Fan (OSS)" To: bhelgaas@google.com, pali@kernel.org Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Peng Fan Subject: [PATCH] pci: introduce static_nr to indicate domain_nr from which IDA Date: Sat, 12 Aug 2023 20:21:28 +0800 Message-Id: <20230812122128.3409733-1-peng.fan@oss.nxp.com> X-Mailer: git-send-email 2.37.1 X-ClientProxiedBy: SG2PR04CA0198.apcprd04.prod.outlook.com (2603:1096:4:14::36) To DU0PR04MB9417.eurprd04.prod.outlook.com (2603:10a6:10:358::11) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DU0PR04MB9417:EE_|DUZPR04MB9846:EE_ X-MS-Office365-Filtering-Correlation-Id: 8d4caa33-60df-4c1c-91bf-08db9b2e00dc X-MS-Exchange-SharedMailbox-RoutingAgent-Processed: True X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Then of_pci_bus_release_domain_nr will actually use the dynamic IDA, even if the IDA was allocated in static IDA. Introduce a static_nr field in pci_bus to indicate the IDA is in dynamic or static IDA to address the upper issue. Fixes: c14f7ccc9f5d ("PCI: Assign PCI domain IDs by ida_alloc()") Signed-off-by: Peng Fan --- drivers/pci/pci.c | 22 ++++++++++++++-------- include/linux/pci.h | 1 + 2 files changed, 15 insertions(+), 8 deletions(-) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 60230da957e0..5c98502bcda6 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -6881,10 +6881,10 @@ static void of_pci_reserve_static_domain_nr(void) } } -static int of_pci_bus_find_domain_nr(struct device *parent) +static int of_pci_bus_find_domain_nr(struct pci_bus *bus, struct device *parent) { static bool static_domains_reserved = false; - int domain_nr; + int domain_nr, ret; /* On the first call scan device tree for static allocations. */ if (!static_domains_reserved) { @@ -6892,6 +6892,8 @@ static int of_pci_bus_find_domain_nr(struct device *parent) static_domains_reserved = true; } + bus->static_nr = 0; + if (parent) { /* * If domain is in DT, allocate it in static IDA. This @@ -6899,10 +6901,14 @@ static int of_pci_bus_find_domain_nr(struct device *parent) * in DT. */ domain_nr = of_get_pci_domain_nr(parent->of_node); - if (domain_nr >= 0) - return ida_alloc_range(&pci_domain_nr_static_ida, - domain_nr, domain_nr, - GFP_KERNEL); + if (domain_nr >= 0) { + ret = ida_alloc_range(&pci_domain_nr_static_ida, + domain_nr, domain_nr, GFP_KERNEL); + if (ret >= 0) + bus->static_nr = 1; + + return ret; + } } /* @@ -6920,7 +6926,7 @@ static void of_pci_bus_release_domain_nr(struct pci_bus *bus, struct device *par return; /* Release domain from IDA where it was allocated. */ - if (of_get_pci_domain_nr(parent->of_node) == bus->domain_nr) + if (bus->static_nr) ida_free(&pci_domain_nr_static_ida, bus->domain_nr); else ida_free(&pci_domain_nr_dynamic_ida, bus->domain_nr); @@ -6928,7 +6934,7 @@ static void of_pci_bus_release_domain_nr(struct pci_bus *bus, struct device *par int pci_bus_find_domain_nr(struct pci_bus *bus, struct device *parent) { - return acpi_disabled ? of_pci_bus_find_domain_nr(parent) : + return acpi_disabled ? of_pci_bus_find_domain_nr(bus, parent) : acpi_pci_bus_find_domain_nr(bus); } diff --git a/include/linux/pci.h b/include/linux/pci.h index eeb2e6f6130f..6dd16e069ab8 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -665,6 +665,7 @@ struct pci_bus { unsigned char cur_bus_speed; /* enum pci_bus_speed */ #ifdef CONFIG_PCI_DOMAINS_GENERIC int domain_nr; + unsigned int static_nr:1; #endif char name[48];