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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 BL02EPF0002992E.mail.protection.outlook.com (10.167.249.59) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9587.10 via Frontend Transport; Fri, 6 Feb 2026 21:50:22 +0000 Received: from ausbcheatha02.xilinx.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; Fri, 6 Feb 2026 15:50:21 -0600 From: Ben Cheatham To: , , , CC: , Subject: [PATCH v8 1/7] libcxl: Add debugfs path to CXL context Date: Fri, 6 Feb 2026 15:50:02 -0600 Message-ID: <20260206215008.8810-2-Benjamin.Cheatham@amd.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260206215008.8810-1-Benjamin.Cheatham@amd.com> References: <20260206215008.8810-1-Benjamin.Cheatham@amd.com> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org 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: BL02EPF0002992E:EE_|SN7PR12MB7252:EE_ X-MS-Office365-Filtering-Correlation-Id: cb95b9ad-c80d-45ae-e37e-08de65c9ba49 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|376014|1800799024|36860700013|30052699003; 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This will be used by poison and procotol error library functions to access the information presented by the filesystem. Reviewed-by: Dave Jiang Signed-off-by: Ben Cheatham --- cxl/lib/libcxl.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/cxl/lib/libcxl.c b/cxl/lib/libcxl.c index 32728de..6b7e92c 100644 --- a/cxl/lib/libcxl.c +++ b/cxl/lib/libcxl.c @@ -8,6 +8,8 @@ #include #include #include +#include +#include #include #include #include @@ -54,6 +56,7 @@ struct cxl_ctx { struct kmod_ctx *kmod_ctx; struct daxctl_ctx *daxctl_ctx; void *private_data; + char *cxl_debugfs; }; static void free_pmem(struct cxl_pmem *pmem) @@ -240,6 +243,38 @@ CXL_EXPORT void *cxl_get_private_data(struct cxl_ctx *ctx) return ctx->private_data; } +static char* get_cxl_debugfs_dir(void) +{ + char *debugfs_dir = NULL; + struct mntent *ent; + FILE *mntf; + + mntf = setmntent("/proc/mounts", "r"); + if (!mntf) + return NULL; + + while ((ent = getmntent(mntf)) != NULL) { + if (!strcmp(ent->mnt_type, "debugfs")) { + /* Magic '5' here is length of "/cxl" + NULL terminator */ + debugfs_dir = calloc(strlen(ent->mnt_dir) + 5, 1); + if (!debugfs_dir) + return NULL; + + strcpy(debugfs_dir, ent->mnt_dir); + strcat(debugfs_dir, "/cxl"); + if (access(debugfs_dir, F_OK) != 0) { + free(debugfs_dir); + debugfs_dir = NULL; + } + + break; + } + } + + endmntent(mntf); + return debugfs_dir; +} + /** * cxl_new - instantiate a new library context * @ctx: context to establish @@ -295,6 +330,7 @@ CXL_EXPORT int cxl_new(struct cxl_ctx **ctx) c->udev = udev; c->udev_queue = udev_queue; c->timeout = 5000; + c->cxl_debugfs = get_cxl_debugfs_dir(); return 0; @@ -350,6 +386,7 @@ 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->cxl_debugfs); free(ctx); } -- 2.52.0