From patchwork Thu May 16 22:40:49 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Verma, Vishal L" X-Patchwork-Id: 10947111 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3FC3F924 for ; Thu, 16 May 2019 22:41:08 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2EA5D28CCD for ; Thu, 16 May 2019 22:41:08 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2332C28CD2; Thu, 16 May 2019 22:41:08 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id BB5C828CCD for ; Thu, 16 May 2019 22:41:07 +0000 (UTC) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id CDB442126CFA4; Thu, 16 May 2019 15:41:05 -0700 (PDT) X-Original-To: linux-nvdimm@lists.01.org Delivered-To: linux-nvdimm@lists.01.org Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=134.134.136.20; helo=mga02.intel.com; envelope-from=vishal.l.verma@intel.com; receiver=linux-nvdimm@lists.01.org Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id B02A02125ADC4 for ; Thu, 16 May 2019 15:41:02 -0700 (PDT) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 16 May 2019 15:41:02 -0700 X-ExtLoop1: 1 Received: from vverma7-desk1.lm.intel.com ([10.232.112.185]) by FMSMGA003.fm.intel.com with ESMTP; 16 May 2019 15:41:02 -0700 From: Vishal Verma To: Subject: [ndctl PATCH v3 06/10] libdaxctl: add an interface to get the mode for a dax device Date: Thu, 16 May 2019 16:40:49 -0600 Message-Id: <20190516224053.3655-7-vishal.l.verma@intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190516224053.3655-1-vishal.l.verma@intel.com> References: <20190516224053.3655-1-vishal.l.verma@intel.com> MIME-Version: 1.0 X-BeenThere: linux-nvdimm@lists.01.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Linux-nvdimm developer list." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Dave Hansen , Pavel Tatashin Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" X-Virus-Scanned: ClamAV using ClamSMTP In preparation for a reconfigure-device command, add an interface to retrieve the 'mode' of a dax device. This will allow the reconfigure-device command (and via daxctl_dev_to_json()), also daxctl-list) to print the mode on device listings via a list command or immediately after a mode change. Cc: Dave Hansen Cc: Dan Williams Signed-off-by: Vishal Verma --- daxctl/lib/libdaxctl.c | 41 ++++++++++++++++++++++++++++++++++++++++ daxctl/lib/libdaxctl.sym | 1 + daxctl/libdaxctl.h | 1 + util/json.c | 14 ++++++++++++++ 4 files changed, 57 insertions(+) diff --git a/daxctl/lib/libdaxctl.c b/daxctl/lib/libdaxctl.c index aab2364..5c85328 100644 --- a/daxctl/lib/libdaxctl.c +++ b/daxctl/lib/libdaxctl.c @@ -12,6 +12,8 @@ */ #include #include +#include +#include #include #include #include @@ -840,6 +842,45 @@ DAXCTL_EXPORT int daxctl_dev_disable(struct daxctl_dev *dev) return 0; } +DAXCTL_EXPORT enum daxctl_dev_mode daxctl_dev_get_mode(struct daxctl_dev *dev) +{ + const char *devname = daxctl_dev_get_devname(dev); + struct daxctl_ctx *ctx = daxctl_dev_get_ctx(dev); + int rc = DAXCTL_DEV_MODE_UNKNOWN; + char path[200]; + const int len = sizeof(path); + char *mod_path, *mod_base; + + if (!daxctl_dev_is_enabled(dev)) + return rc; + + /* dax-class model only has conventional devdax devices */ + if (ctx->subsys != DAX_BUS) + return DAXCTL_DEV_MODE_DEVDAX; + + if (snprintf(path, len, "%s/driver/module", dev->dev_path) >= len) { + err(ctx, "%s: buffer too small!\n", devname); + return -ENXIO; + } + + mod_path = realpath(path, NULL); + if (!mod_path) { + rc = -errno; + err(ctx, "%s: unable to determine module: %s\n", devname, + strerror(errno)); + return rc; + } + + mod_base = basename(mod_path); + if (strcmp(mod_base, dax_modules[DAXCTL_DEV_MODE_RAM]) == 0) + rc = DAXCTL_DEV_MODE_RAM; + else if (strcmp(mod_base, dax_modules[DAXCTL_DEV_MODE_DEVDAX]) == 0) + rc = DAXCTL_DEV_MODE_DEVDAX; + + free(mod_path); + return rc; +} + DAXCTL_EXPORT struct daxctl_ctx *daxctl_dev_get_ctx(struct daxctl_dev *dev) { return dev->region->ctx; diff --git a/daxctl/lib/libdaxctl.sym b/daxctl/lib/libdaxctl.sym index cc47ed6..d53976d 100644 --- a/daxctl/lib/libdaxctl.sym +++ b/daxctl/lib/libdaxctl.sym @@ -62,4 +62,5 @@ global: daxctl_dev_online_node; daxctl_dev_offline_node; daxctl_dev_node_is_online; + daxctl_dev_get_mode; } LIBDAXCTL_5; diff --git a/daxctl/libdaxctl.h b/daxctl/libdaxctl.h index db0d4ea..4f9088f 100644 --- a/daxctl/libdaxctl.h +++ b/daxctl/libdaxctl.h @@ -76,6 +76,7 @@ int daxctl_dev_enable_ram(struct daxctl_dev *dev); int daxctl_dev_online_node(struct daxctl_dev *dev); int daxctl_dev_offline_node(struct daxctl_dev *dev); int daxctl_dev_node_is_online(struct daxctl_dev *dev); +enum daxctl_dev_mode daxctl_dev_get_mode(struct daxctl_dev *dev); #define daxctl_dev_foreach(region, dev) \ for (dev = daxctl_dev_get_first(region); \ diff --git a/util/json.c b/util/json.c index b7ce719..4f13222 100644 --- a/util/json.c +++ b/util/json.c @@ -271,6 +271,7 @@ struct json_object *util_daxctl_dev_to_json(struct daxctl_dev *dev, { const char *devname = daxctl_dev_get_devname(dev); struct json_object *jdev, *jobj; + enum daxctl_dev_mode mode; int node; jdev = json_object_new_object(); @@ -292,6 +293,19 @@ struct json_object *util_daxctl_dev_to_json(struct daxctl_dev *dev, json_object_object_add(jdev, "numa_node", jobj); } + mode = daxctl_dev_get_mode(dev); + if (mode > 0) { + jobj = NULL; + if (mode == DAXCTL_DEV_MODE_RAM) + jobj = json_object_new_string("system-ram"); + else if (mode == DAXCTL_DEV_MODE_DEVDAX) + jobj = json_object_new_string("devdax"); + else + jobj = json_object_new_string("unknown"); + if (jobj) + json_object_object_add(jdev, "mode", jobj); + } + return jdev; }