From patchwork Fri Jan 18 02:33:06 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 10769329 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 60F496C5 for ; Fri, 18 Jan 2019 02:45:46 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4A47A2EFB4 for ; Fri, 18 Jan 2019 02:45:46 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3D21B2EFBB; Fri, 18 Jan 2019 02:45:46 +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 C940F2EFB4 for ; Fri, 18 Jan 2019 02:45:45 +0000 (UTC) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id B4351211B85E7; Thu, 17 Jan 2019 18:45:45 -0800 (PST) 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=192.55.52.136; helo=mga12.intel.com; envelope-from=dan.j.williams@intel.com; receiver=linux-nvdimm@lists.01.org Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) (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 2CCE3211B509C for ; Thu, 17 Jan 2019 18:45:44 -0800 (PST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Jan 2019 18:45:43 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,489,1539673200"; d="scan'208";a="117598244" Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.54.39.16]) by fmsmga008.fm.intel.com with ESMTP; 17 Jan 2019 18:45:43 -0800 Subject: [daxctl PATCH v3 1/3] daxctl: Support the /sys/bus/dax ABI From: Dan Williams To: vishal.l.verma@intel.com Date: Thu, 17 Jan 2019 18:33:06 -0800 Message-ID: <154777878668.2060068.4181003086210283179.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <154777878104.2060068.1465998507656988115.stgit@dwillia2-desk3.amr.corp.intel.com> References: <154777878104.2060068.1465998507656988115.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-2-gc94f 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: linux-nvdimm@lists.01.org Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" X-Virus-Scanned: ClamAV using ClamSMTP The kernel is implementing a '/sys/bus/dax' ABI to allow for alternate device-DAX drivers to be bound to device instances. In support of this conversion, teach the libdaxctl subsystem-layout-specific code to parse the new layout. For backwards compatibility the implementation transparently and optionally supports either '/sys/bus/dax' or '/sys/class/dax'. Signed-off-by: Dan Williams --- daxctl/lib/libdaxctl-private.h | 11 ++++++ daxctl/lib/libdaxctl.c | 70 +++++++++++++++++++++++++++++----------- util/sysfs.c | 2 + 3 files changed, 62 insertions(+), 21 deletions(-) diff --git a/daxctl/lib/libdaxctl-private.h b/daxctl/lib/libdaxctl-private.h index f7667324026f..4a462e7245d2 100644 --- a/daxctl/lib/libdaxctl-private.h +++ b/daxctl/lib/libdaxctl-private.h @@ -15,6 +15,17 @@ #define DAXCTL_EXPORT __attribute__ ((visibility("default"))) +enum dax_subsystem { + DAX_UNKNOWN, + DAX_CLASS, + DAX_BUS, +}; + +static const char *dax_subsystems[] = { + [DAX_CLASS] = "/sys/class/dax", + [DAX_BUS] = "/sys/bus/dax/devices", +}; + /** * struct daxctl_region - container for dax_devices */ diff --git a/daxctl/lib/libdaxctl.c b/daxctl/lib/libdaxctl.c index 22f4210a7ea0..c2e3a52d6c7c 100644 --- a/daxctl/lib/libdaxctl.c +++ b/daxctl/lib/libdaxctl.c @@ -444,26 +444,38 @@ static void dax_devices_init(struct daxctl_region *region) { struct daxctl_ctx *ctx = daxctl_region_get_ctx(region); char daxdev_fmt[50]; - char *region_path; + size_t i; if (region->devices_init) return; region->devices_init = 1; sprintf(daxdev_fmt, "dax%d.", region->id); - if (asprintf(®ion_path, "%s/dax", region->region_path) < 0) { - dbg(ctx, "region path alloc fail\n"); - return; + for (i = 0; i < ARRAY_SIZE(dax_subsystems); i++) { + char *region_path; + + if (i == DAX_BUS) + region_path = region->region_path; + else if (i == DAX_CLASS) { + if (asprintf(®ion_path, "%s/dax", + region->region_path) < 0) { + dbg(ctx, "region path alloc fail\n"); + continue; + } + } else + continue; + sysfs_device_parse(ctx, region_path, daxdev_fmt, region, + add_dax_dev); + if (i == DAX_CLASS) + free(region_path); } - sysfs_device_parse(ctx, region_path, daxdev_fmt, region, add_dax_dev); - free(region_path); } -static char *dax_region_path(const char *base, const char *device) +static char *dax_region_path(const char *device, enum dax_subsystem subsys) { char *path, *region_path, *c; - if (asprintf(&path, "%s/%s", base, device) < 0) + if (asprintf(&path, "%s/%s", dax_subsystems[subsys], device) < 0) return NULL; /* dax_region must be the instance's direct parent */ @@ -472,7 +484,11 @@ static char *dax_region_path(const char *base, const char *device) if (!region_path) return NULL; - /* 'region_path' is now regionX/dax/daxX.Y', trim back to regionX */ + /* + * 'region_path' is now regionX/dax/daxX.Y' (DAX_CLASS), or + * regionX/daxX.Y (DAX_BUS), trim it back to the regionX + * component + */ c = strrchr(region_path, '/'); if (!c) { free(region_path); @@ -480,6 +496,9 @@ static char *dax_region_path(const char *base, const char *device) } *c = '\0'; + if (subsys == DAX_BUS) + return region_path; + c = strrchr(region_path, '/'); if (!c) { free(region_path); @@ -490,20 +509,15 @@ static char *dax_region_path(const char *base, const char *device) return region_path; } -static void dax_regions_init(struct daxctl_ctx *ctx) +static void __dax_regions_init(struct daxctl_ctx *ctx, enum dax_subsystem subsys) { - const char *base = "/sys/class/dax"; struct dirent *de; - DIR *dir; + DIR *dir = NULL; - if (ctx->regions_init) - return; - - ctx->regions_init = 1; - - dir = opendir(base); + dir = opendir(dax_subsystems[subsys]); if (!dir) { - dbg(ctx, "no dax regions found\n"); + dbg(ctx, "no dax regions found via: %s\n", + dax_subsystems[subsys]); return; } @@ -516,7 +530,7 @@ static void dax_regions_init(struct daxctl_ctx *ctx) continue; if (sscanf(de->d_name, "dax%d.%d", ®ion_id, &id) != 2) continue; - dev_path = dax_region_path(base, de->d_name); + dev_path = dax_region_path(de->d_name, subsys); if (!dev_path) { err(ctx, "dax region path allocation failure\n"); continue; @@ -529,6 +543,22 @@ static void dax_regions_init(struct daxctl_ctx *ctx) closedir(dir); } +static void dax_regions_init(struct daxctl_ctx *ctx) +{ + size_t i; + + if (ctx->regions_init) + return; + + ctx->regions_init = 1; + + for (i = 0; i < ARRAY_SIZE(dax_subsystems); i++) { + if (i == DAX_UNKNOWN) + continue; + __dax_regions_init(ctx, i); + } +} + DAXCTL_EXPORT struct daxctl_dev *daxctl_dev_get_first(struct daxctl_region *region) { dax_devices_init(region); diff --git a/util/sysfs.c b/util/sysfs.c index 0440fd0f49a3..9f7bc1f4930f 100644 --- a/util/sysfs.c +++ b/util/sysfs.c @@ -91,7 +91,7 @@ int __sysfs_device_parse(struct log_ctx *ctx, const char *base_path, struct dirent *de; DIR *dir; - log_dbg(ctx, "base: %s dev: %s\n", base_path, dev_name); + log_dbg(ctx, "base: '%s' dev: '%s'\n", base_path, dev_name); dir = opendir(base_path); if (!dir) { log_dbg(ctx, "no \"%s\" devices found\n", dev_name);