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Mon, 15 Jul 2024 12:29:02 -0500 From: To: , , , , , , , , , CC: Alejandro Lucero Subject: [PATCH v2 14/15] cxl: add function for obtaining params from a region Date: Mon, 15 Jul 2024 18:28:34 +0100 Message-ID: <20240715172835.24757-15-alejandro.lucero-palau@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20240715172835.24757-1-alejandro.lucero-palau@amd.com> References: <20240715172835.24757-1-alejandro.lucero-palau@amd.com> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Received-SPF: None (SATLEXMB05.amd.com: alejandro.lucero-palau@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF000023DA:EE_|IA0PR12MB8424:EE_ X-MS-Office365-Filtering-Correlation-Id: de1c62ff-e12e-4af6-6625-08dca4f3a08d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|376014|1800799024|36860700013|921020; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Jul 2024 17:29:05.5991 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: de1c62ff-e12e-4af6-6625-08dca4f3a08d 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=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF000023DA.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB8424 From: Alejandro Lucero A CXL region struct contains the physical address to work with. Add a function for given a opaque cxl region struct returns the params to be used for mapping such memory range. Signed-off-by: Alejandro Lucero --- drivers/cxl/core/region.c | 16 ++++++++++++++++ drivers/cxl/cxl.h | 3 +++ include/linux/cxl_accel_mem.h | 2 ++ 3 files changed, 21 insertions(+) diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index c8fc14ac437e..9ff10923e9fc 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -3345,6 +3345,22 @@ static int devm_cxl_add_dax_region(struct cxl_region *cxlr) return rc; } +int cxl_accel_get_region_params(struct cxl_region *region, + resource_size_t *start, resource_size_t *end) +{ + if (!region) + return -ENODEV; + + if (!region->params.res) { + return -ENODEV; + } + *start = region->params.res->start; + *end = region->params.res->end; + + return 0; +} +EXPORT_SYMBOL_NS_GPL(cxl_accel_get_region_params, CXL); + static int match_root_decoder_by_range(struct device *dev, void *data) { struct range *r1, *r2 = data; diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 1bf3b74ff959..b4c4c4455ef1 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -906,6 +906,9 @@ void cxl_coordinates_combine(struct access_coordinate *out, bool cxl_endpoint_decoder_reset_detected(struct cxl_port *port); int cxl_region_detach(struct cxl_endpoint_decoder *cxled); + +int cxl_accel_get_region_params(struct cxl_region *region, + resource_size_t *start, resource_size_t *end); /* * Unit test builds overrides this to __weak, find the 'strong' version * of these symbols in tools/testing/cxl/. diff --git a/include/linux/cxl_accel_mem.h b/include/linux/cxl_accel_mem.h index a5f9ffc24509..5d715eea6e91 100644 --- a/include/linux/cxl_accel_mem.h +++ b/include/linux/cxl_accel_mem.h @@ -53,4 +53,6 @@ struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd, int ways); int cxl_region_detach(struct cxl_endpoint_decoder *cxled); +int cxl_accel_get_region_params(struct cxl_region *region, + resource_size_t *start, resource_size_t *end); #endif