From patchwork Fri Aug 16 14:44:27 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ira Weiny X-Patchwork-Id: 13766477 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 570471C9EBA; Fri, 16 Aug 2024 14:45:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.19 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723819524; cv=none; b=nQR8U3JUTWgjXGw9kiMCpQwkQZL26IgeV6JrI2cA7cq+QDb1ZzuhJcWQPfd7YjpYWINpqBKP8x+zDWw4D10qLNiKP0tWBfFX5b1K9WzTWsoe1jG4WqEp3FjPU95cd3RBSNrFZt2dX2YxiiMmOiPn/kL8oj+IU6NzNiG4Nr7FzZA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723819524; c=relaxed/simple; bh=TT1Kr8PjO9EzFFK+7ZI6aOJhz7Bla3ibNxpdthisd9I=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=JKkcMEgYQPbtxx7lbQYGj3uAWRUK254apce+c3f4fuLl43Ew7uKGfbDSbTFKuac5hUKP/wQWINDSU9N0MRpunQzbOMgmoN4uwtHc5WmapcymEPF1wMx5ghdlyPKoAchEAeV1Yj6FOJBVTGIn6Dy6emK8BuIhNoLIsmWKaG0Ntx0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=QzUZ1Aka; arc=none smtp.client-ip=198.175.65.19 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="QzUZ1Aka" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1723819522; x=1755355522; h=from:date:subject:mime-version:content-transfer-encoding: message-id:references:in-reply-to:to:cc; bh=TT1Kr8PjO9EzFFK+7ZI6aOJhz7Bla3ibNxpdthisd9I=; b=QzUZ1Akalk/lTbNAuTt0p6gaWqfJbOr8jyrwqpLPoLOj1MFENSMzSHQ7 ZH9ctY81j8VTfuxgcVkablBNHk85SnRWP5X/g6G75awVPLD5+vecmXdS5 p6DaoaWs8JyjrmuELKhmgZzpBqpSljffEy2vHzZ+eQGj5Bk9EWTg/3Cy2 HbNuyA6ppOLT0DG8x7RBtB75cuykindbWnCxGukWx8fRQMGxMtMEJ1VWZ oP0+r4xY9pSO/GONzI6lX2NZcRB07DIqf0NCnXqbWweYS6ZUHXtCbyfGz 6g10/qpucdHJMQuc7PFjpphXdf72PtYI9BWas+3Lfek5WeiGj5T0pQu0p A==; X-CSE-ConnectionGUID: lmBQQiMHQWu+Rny+9EqJ9A== X-CSE-MsgGUID: 9jKAaHTwSxCcCFyhNjjEpw== X-IronPort-AV: E=McAfee;i="6700,10204,11166"; a="21973076" X-IronPort-AV: E=Sophos;i="6.10,152,1719903600"; d="scan'208";a="21973076" Received: from orviesa001.jf.intel.com ([10.64.159.141]) by orvoesa111.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Aug 2024 07:45:16 -0700 X-CSE-ConnectionGUID: tUYCTGFkSzaPN9P6zbceww== X-CSE-MsgGUID: dprJ10YzQJileWRUBUkIBw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,152,1719903600"; d="scan'208";a="97205589" Received: from iweiny-mobl.amr.corp.intel.com (HELO localhost) ([10.125.111.52]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Aug 2024 07:45:14 -0700 From: ira.weiny@intel.com Date: Fri, 16 Aug 2024 09:44:27 -0500 Subject: [PATCH v3 19/25] cxl/region/extent: Expose region extent information in sysfs Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240816-dcd-type2-upstream-v3-19-7c9b96cba6d7@intel.com> References: <20240816-dcd-type2-upstream-v3-0-7c9b96cba6d7@intel.com> In-Reply-To: <20240816-dcd-type2-upstream-v3-0-7c9b96cba6d7@intel.com> To: Dave Jiang , Fan Ni , Jonathan Cameron , Navneet Singh , Chris Mason , Josef Bacik , David Sterba , Petr Mladek , Steven Rostedt , Andy Shevchenko , Rasmus Villemoes , Sergey Senozhatsky , Jonathan Corbet , Andrew Morton Cc: Dan Williams , Davidlohr Bueso , Alison Schofield , Vishal Verma , Ira Weiny , linux-btrfs@vger.kernel.org, linux-cxl@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, nvdimm@lists.linux.dev X-Mailer: b4 0.15-dev-37811 X-Developer-Signature: v=1; a=ed25519-sha256; t=1723819456; l=4265; i=ira.weiny@intel.com; s=20221211; h=from:subject:message-id; bh=P6/+fplyb/+ZFSyo0jMPTE6EnFG/uQFiP+mkQTWMlTw=; b=jJ/QAzyqkapSRG4kL6kqyv7V1JLB/WbgPKA6B6ukODICQ1/SWCQ8h15xfdofW4liBTcfefaIg gmpp1pYAv5iCarZOWUqZWJfKimfBxDTV8xbsQMPKGfg3COoln/jHsWX X-Developer-Key: i=ira.weiny@intel.com; a=ed25519; pk=noldbkG+Wp1qXRrrkfY1QJpDf7QsOEthbOT7vm0PqsE= From: Navneet Singh Extent information can be helpful to the user to coordinate memory usage with the external orchestrator and FM. Expose the details of region extents by creating the following sysfs entries. /sys/bus/cxl/devices/dax_regionX/extentX.Y /sys/bus/cxl/devices/dax_regionX/extentX.Y/offset /sys/bus/cxl/devices/dax_regionX/extentX.Y/length /sys/bus/cxl/devices/dax_regionX/extentX.Y/tag Signed-off-by: Navneet Singh Co-developed-by: Ira Weiny Signed-off-by: Ira Weiny Reviewed-by: Jonathan Cameron Reviewed-by: Fan Ni --- Changes: [iweiny: split this out] [Jonathan: add documentation for extent sysfs] [Jonathan/djbw: s/label/tag] [Jonathan/djbw: treat tag as uuid] [djbw: use __ATTRIBUTE_GROUPS] [djbw: make tag invisible if it is empty] [djbw/iweiny: use conventional id names for extents; extentX.Y] --- Documentation/ABI/testing/sysfs-bus-cxl | 13 ++++++++ drivers/cxl/core/extent.c | 58 +++++++++++++++++++++++++++++++++ 2 files changed, 71 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-cxl b/Documentation/ABI/testing/sysfs-bus-cxl index 3a5ee88e551b..e97e6a73c960 100644 --- a/Documentation/ABI/testing/sysfs-bus-cxl +++ b/Documentation/ABI/testing/sysfs-bus-cxl @@ -599,3 +599,16 @@ Description: See Documentation/ABI/stable/sysfs-devices-node. access0 provides the number to the closest initiator and access1 provides the number to the closest CPU. + +What: /sys/bus/cxl/devices/dax_regionX/extentX.Y/offset + /sys/bus/cxl/devices/dax_regionX/extentX.Y/length + /sys/bus/cxl/devices/dax_regionX/extentX.Y/tag +Date: October, 2024 +KernelVersion: v6.12 +Contact: linux-cxl@vger.kernel.org +Description: + (RO) [For Dynamic Capacity regions only] Extent offset and + length within the region. Users can use the extent information + to create DAX devices on specific extents. This is done by + creating and destroying DAX devices in specific sequences and + looking at the mappings created. diff --git a/drivers/cxl/core/extent.c b/drivers/cxl/core/extent.c index 34456594cdc3..d7d526a51e2b 100644 --- a/drivers/cxl/core/extent.c +++ b/drivers/cxl/core/extent.c @@ -6,6 +6,63 @@ #include "core.h" +static ssize_t offset_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct region_extent *region_extent = to_region_extent(dev); + + return sysfs_emit(buf, "%#llx\n", region_extent->hpa_range.start); +} +static DEVICE_ATTR_RO(offset); + +static ssize_t length_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct region_extent *region_extent = to_region_extent(dev); + u64 length = range_len(®ion_extent->hpa_range); + + return sysfs_emit(buf, "%#llx\n", length); +} +static DEVICE_ATTR_RO(length); + +static ssize_t tag_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct region_extent *region_extent = to_region_extent(dev); + + return sysfs_emit(buf, "%pUb\n", ®ion_extent->tag); +} +static DEVICE_ATTR_RO(tag); + +static struct attribute *region_extent_attrs[] = { + &dev_attr_offset.attr, + &dev_attr_length.attr, + &dev_attr_tag.attr, + NULL, +}; + +static uuid_t empty_tag = { 0 }; + +static umode_t region_extent_visible(struct kobject *kobj, + struct attribute *a, int n) +{ + struct device *dev = kobj_to_dev(kobj); + struct region_extent *region_extent = to_region_extent(dev); + + if (a == &dev_attr_tag.attr && + uuid_equal(®ion_extent->tag, &empty_tag)) + return 0; + + return a->mode; +} + +static const struct attribute_group region_extent_attribute_group = { + .attrs = region_extent_attrs, + .is_visible = region_extent_visible, +}; + +__ATTRIBUTE_GROUPS(region_extent_attribute); + static void cxled_release_extent(struct cxl_endpoint_decoder *cxled, struct cxled_extent *ed_extent) { @@ -44,6 +101,7 @@ static void region_extent_release(struct device *dev) static const struct device_type region_extent_type = { .name = "extent", .release = region_extent_release, + .groups = region_extent_attribute_groups, }; bool is_region_extent(struct device *dev)