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Fri, 16 Oct 2026 09:19:04 -0700 From: To: , , , , , , , , , , , , , , , , , , , , CC: , , , , , , , , , , , , Jonathan Cameron Subject: [PATCH v6 01/31] cxl/regs: Split the BAR block request and ioremap helpers Date: Fri, 16 Oct 2026 21:48:08 +0530 Message-ID: <20261016161839.2765592-2-mhonap@nvidia.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261016161839.2765592-1-mhonap@nvidia.com> References: <20261016161839.2765592-1-mhonap@nvidia.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: rnnvmail201.nvidia.com (10.129.68.8) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN7PEPF000000A6:EE_|MW6PR12MB8915:EE_ X-MS-Office365-Filtering-Correlation-Id: e13a7b98-56a9-4d39-ae48-08df2ba1472f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|23010399003|82310400026|1800799024|7416014|376014|22082099003|10067099003|18002099003|921020|11063799006|56012099006; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: HowUvtEJ7i9vE6Gwmh2q/+X6FJnW61lf2wXfQr2n46ZsS6GgxhRrA5UBO8sPtweOhy7Nf9T8CHcCIhtTM5kwUEBKeMAjFC9Gk2oCEyzBWUhriPuz4Di7H+1Si60mxo1v9Qitr3TWhNHbk31WWj1ZSzWoBPl6HL7D3aWdpI7Ut2mltmaBW2reJoqhoKgld5JBuiWgV12kj4ODVUkvGieCm60NEQqUPdWa1/L50jzlLt5RNd4XCfZ/3ivkJuvV3liXhWtvzyCnTDvnhRGr0t2th5dBNTsEAzmelrkceievdHmQIFpxwqU34iFMPXXTG6X9FG1wxrar5cB+GjkPMcHjWrY01oT1jNhhkDGJEskh+U6DF6j2vj0ijx8P9qZIa+GeHoAe2Bww0+LVOi+/J+tzuZ9G+obCpUExdOx7uUGZFGW17gYVyqIi1urOHGRXlO4B X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Oct 2026 16:19:39.2031 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e13a7b98-56a9-4d39-ae48-08df2ba1472f 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: BN7PEPF000000A6.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW6PR12MB8915 From: Manish Honap devm_cxl_iomap_block() claims a register block with devm_request_mem_region() and then maps it with devm_ioremap(). A driver that already owns the parent BAR needs to skip the sub-block request while still mapping it, so the request and the map must be callable independently. Split them into devm_cxl_request_block() and devm_cxl_ioremap_block(). devm_cxl_iomap_block() keeps calling both in turn, so there is no functional change. Assisted-by: LLM Reviewed-by: Jonathan Cameron Signed-off-by: Manish Honap --- drivers/cxl/core/regs.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/drivers/cxl/core/regs.c b/drivers/cxl/core/regs.c index ba1f942d20e1..9235520b2f4e 100644 --- a/drivers/cxl/core/regs.c +++ b/drivers/cxl/core/regs.c @@ -177,6 +177,20 @@ void cxl_probe_device_regs(struct device *dev, void __iomem *base, } EXPORT_SYMBOL_NS_GPL(cxl_probe_device_regs, "CXL"); +static struct resource *devm_cxl_request_block(struct device *dev, + resource_size_t addr, + resource_size_t length) +{ + return devm_request_mem_region(dev, addr, length, dev_name(dev)); +} + +static void __iomem *devm_cxl_ioremap_block(struct device *dev, + resource_size_t addr, + resource_size_t length) +{ + return devm_ioremap(dev, addr, length); +} + void __iomem *devm_cxl_iomap_block(struct device *dev, resource_size_t addr, resource_size_t length) { @@ -186,7 +200,7 @@ void __iomem *devm_cxl_iomap_block(struct device *dev, resource_size_t addr, if (WARN_ON_ONCE(addr == CXL_RESOURCE_NONE)) return NULL; - res = devm_request_mem_region(dev, addr, length, dev_name(dev)); + res = devm_cxl_request_block(dev, addr, length); if (!res) { resource_size_t end = addr + length - 1; @@ -194,7 +208,7 @@ void __iomem *devm_cxl_iomap_block(struct device *dev, resource_size_t addr, return NULL; } - ret_val = devm_ioremap(dev, addr, length); + ret_val = devm_cxl_ioremap_block(dev, addr, length); if (!ret_val) dev_err(dev, "Failed to map region %pr\n", res); -- 2.53.0