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client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by CO1PEPF000042A7.mail.protection.outlook.com (10.167.243.36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9388.8 via Frontend Transport; Tue, 9 Dec 2025 17:14:36 +0000 Received: from ausbcheatha02.amd.com (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17; Tue, 9 Dec 2025 11:14:30 -0600 From: Ben Cheatham To: CC: , , , Subject: [PATCH v4 1/7] libcxl: Add debugfs path to CXL context Date: Tue, 9 Dec 2025 11:13:58 -0600 Message-ID: <20251209171404.64412-2-Benjamin.Cheatham@amd.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251209171404.64412-1-Benjamin.Cheatham@amd.com> References: <20251209171404.64412-1-Benjamin.Cheatham@amd.com> Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: satlexmb08.amd.com (10.181.42.217) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000042A7:EE_|CH0PR12MB8550:EE_ X-MS-Office365-Filtering-Correlation-Id: c8c7e5b7-3e87-4721-7b7c-08de37466ded X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|30052699003|1800799024|82310400026|36860700013|376014; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Dec 2025 17:14:36.3372 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c8c7e5b7-3e87-4721-7b7c-08de37466ded 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=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1PEPF000042A7.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH0PR12MB8550 Find the CXL debugfs mount point and add it to the CXL library context. This will be used by poison and procotol error library functions to access the information presented by the filesystem. Signed-off-by: Ben Cheatham --- cxl/lib/libcxl.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/cxl/lib/libcxl.c b/cxl/lib/libcxl.c index cafde1c..3718b76 100644 --- a/cxl/lib/libcxl.c +++ b/cxl/lib/libcxl.c @@ -54,6 +54,7 @@ struct cxl_ctx { struct kmod_ctx *kmod_ctx; struct daxctl_ctx *daxctl_ctx; void *private_data; + const char *debugfs; }; static void free_pmem(struct cxl_pmem *pmem) @@ -240,6 +241,43 @@ CXL_EXPORT void *cxl_get_private_data(struct cxl_ctx *ctx) return ctx->private_data; } +static const char *get_debugfs_dir(void) +{ + char *dev, *dir, *type, *debugfs_dir = NULL; + char line[PATH_MAX + 256 + 1]; + FILE *fp; + + fp = fopen("/proc/mounts", "r"); + if (!fp) + return debugfs_dir; + + while (fgets(line, sizeof(line), fp)) { + dev = strtok(line, " \t"); + if (!dev) + break; + + dir = strtok(NULL, " \t"); + if (!dir) + break; + + type = strtok(NULL, " \t"); + if (!type) + break; + + if (!strcmp(type, "debugfs")) { + debugfs_dir = calloc(strlen(dir) + 1, 1); + if (!debugfs_dir) + break; + + strcpy(debugfs_dir, dir); + break; + } + } + + fclose(fp); + return debugfs_dir; +} + /** * cxl_new - instantiate a new library context * @ctx: context to establish @@ -295,6 +333,7 @@ CXL_EXPORT int cxl_new(struct cxl_ctx **ctx) c->udev = udev; c->udev_queue = udev_queue; c->timeout = 5000; + c->debugfs = get_debugfs_dir(); return 0; @@ -350,6 +389,7 @@ CXL_EXPORT void cxl_unref(struct cxl_ctx *ctx) kmod_unref(ctx->kmod_ctx); daxctl_unref(ctx->daxctl_ctx); info(ctx, "context %p released\n", ctx); + free((void *)ctx->debugfs); free(ctx); } -- 2.51.1