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Wed, 8 May 2024 10:41:57 -0700 From: Vidya Sagar To: , , , , , , , CC: , , , , , , , , , , Subject: [PATCH V7 2/4] PCI: of: Add of_pci_preserve_config() for per-host bridge support Date: Wed, 8 May 2024 23:11:36 +0530 Message-ID: <20240508174138.3630283-3-vidyas@nvidia.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240508174138.3630283-1-vidyas@nvidia.com> References: <20240508174138.3630283-1-vidyas@nvidia.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NVConfidentiality: public X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS1PEPF00017099:EE_|PH8PR12MB6866:EE_ X-MS-Office365-Filtering-Correlation-Id: 90f46134-1f9d-4ce1-aa6e-08dc6f86350e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230031|1800799015|7416005|36860700004|82310400017|376005; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.161; CTRY:US; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:mail.nvidia.com; PTR:dc6edge2.nvidia.com; CAT:NONE; SFS:(13230031)(1800799015)(7416005)(36860700004)(82310400017)(376005); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 May 2024 17:42:18.4659 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 90f46134-1f9d-4ce1-aa6e-08dc6f86350e X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.117.161]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DS1PEPF00017099.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR12MB6866 Add of_pci_preserve_config() to look for the "linux,pci-probe-only" property under a specified node. If it's not found there, look under "of_chosen" in addition. If the caller didn't specify a node, look under "of_chosen". With a future patch, this will support "linux,pci-probe-only" on a per host bridge basis based on the presence of the property in the respective PCI host bridge DT node. Implement of_pci_check_probe_only() using of_pci_preserve_config(). Signed-off-by: Vidya Sagar --- drivers/pci/of.c | 54 ++++++++++++++++++++++++++++++++++++++--------- drivers/pci/pci.h | 7 ++++++ 2 files changed, 51 insertions(+), 10 deletions(-) diff --git a/drivers/pci/of.c b/drivers/pci/of.c index 51e3dd0ea5ab..d21c0bed36f3 100644 --- a/drivers/pci/of.c +++ b/drivers/pci/of.c @@ -234,27 +234,61 @@ int of_get_pci_domain_nr(struct device_node *node) EXPORT_SYMBOL_GPL(of_get_pci_domain_nr); /** - * of_pci_check_probe_only - Setup probe only mode if linux,pci-probe-only - * is present and valid + * of_pci_preserve_config - Return true if the boot configuration needs to + * be preserved + * @node: Device tree node. + * + * This function looks for "linux,pci-probe-only" property for a given + * PCI controller's node and returns true if found. It will also look in the + * chosen node if the property is not found in the given controller's node. + * Having this property ensures that the kernel doesn't reconfigure the + * BARs and bridge windows that are already done by the platform firmware. + * + * Return: true if the property exists false otherwise. */ -void of_pci_check_probe_only(void) +bool of_pci_preserve_config(struct device_node *node) { - u32 val; + u32 val = 0; int ret; - ret = of_property_read_u32(of_chosen, "linux,pci-probe-only", &val); + if (!node) { + pr_warn("device node is NULL, trying with of_chosen\n"); + node = of_chosen; + } + +retry: + ret = of_property_read_u32(node, "linux,pci-probe-only", &val); if (ret) { - if (ret == -ENODATA || ret == -EOVERFLOW) - pr_warn("linux,pci-probe-only without valid value, ignoring\n"); - return; + if (ret == -ENODATA || ret == -EOVERFLOW) { + pr_warn("Incorrect value for linux,pci-probe-only in %pOF, ignoring\n", + node); + return false; + } + if (ret == -EINVAL) { + if (node == of_chosen) + return false; + + node = of_chosen; + goto retry; + } } if (val) + return true; + else + return false; +} + +/** + * of_pci_check_probe_only - Setup probe only mode if linux,pci-probe-only + * is present and valid + */ +void of_pci_check_probe_only(void) +{ + if (of_pci_preserve_config(of_chosen)) pci_add_flags(PCI_PROBE_ONLY); else pci_clear_flags(PCI_PROBE_ONLY); - - pr_info("PROBE_ONLY %s\n", val ? "enabled" : "disabled"); } EXPORT_SYMBOL_GPL(of_pci_check_probe_only); diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 180d3907b543..feedbedd65df 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -650,6 +650,7 @@ int of_pci_get_max_link_speed(struct device_node *node); u32 of_pci_get_slot_power_limit(struct device_node *node, u8 *slot_power_limit_value, u8 *slot_power_limit_scale); +bool of_pci_preserve_config(struct device_node *node); int pci_set_of_node(struct pci_dev *dev); void pci_release_of_node(struct pci_dev *dev); void pci_set_bus_of_node(struct pci_bus *bus); @@ -688,6 +689,12 @@ of_pci_get_slot_power_limit(struct device_node *node, return 0; } +static inline bool +of_pci_preserve_config(struct device_node *node) +{ + return false; +} + static inline int pci_set_of_node(struct pci_dev *dev) { return 0; } static inline void pci_release_of_node(struct pci_dev *dev) { } static inline void pci_set_bus_of_node(struct pci_bus *bus) { }