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Wed, 16 Sep 2026 11:36:07 -0700 From: To: , , , , , , , , , , , , , , , , , , , , CC: , , , , , , , , , , , Subject: [PATCH v5 01/27] cxl/regs: Split the BAR block request and ioremap helpers Date: Thu, 17 Sep 2026 00:05:14 +0530 Message-ID: <20260916183540.3813685-2-mhonap@nvidia.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260916183540.3813685-1-mhonap@nvidia.com> References: <20260916183540.3813685-1-mhonap@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: rnnvmail202.nvidia.com (10.129.68.7) To rnnvmail202.nvidia.com (10.129.68.7) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV8PEPF0000006B:EE_|SJ2PR12MB7867:EE_ X-MS-Office365-Filtering-Correlation-Id: b7341e51-9c2c-4f89-0d65-08df142177e4 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|7416014|82310400026|36860700016|23010399003|376014|921020|10067099003|56012099006|11063799006|18002099003|22082099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: +z6Lrj9Msi/vLkU8DyAVcHeSotCKSqotQK7peVn7yXq/B3hn0/buuBepQcxHcuKAI7KipWufu9zIPPFF/p6Xqd+CbBY2BIbAnSn64mQHzhrY2WsGEnbwJnaPxLbb0kicWUPtUbNoOZaDBdCe3HjoJCVDbIW3Fi4kC9YADPkYKKIcJtyT8ms7/JV4n0TqSV4WlGXXfZRKSN/flsD/XKGRXGxzgNTZop1U0ymeZBt9ks0E080v48RO5DNZhlWTotTIV9NX9HhrlrMrqzrZYEf/ngHiC1hYYmRUTLQCYfWDN7EMArcjrXuSAPCtUxvKxrIz1E1UA1xbJvvQelS7VYstlo8sm3PJ4k/ZbF4VKWgEdWzI2MVefv24Eky9lPeza1C/3uYnG3Q+i08Rui4pUBjMFG5HzeqA5/aDGMUG6WzyCMP8vy1DezduW7L0YVuias0j X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Sep 2026 18:36:48.5972 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b7341e51-9c2c-4f89-0d65-08df142177e4 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: LV8PEPF0000006B.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB7867 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 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 989e79383b99..d79550dbb484 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); -- 2.25.1