From nobody Wed Nov 27 23:43:04 2024 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (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 EA7A918CBFD; Mon, 7 Oct 2024 23:17:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.8 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728343037; cv=none; b=Kmt2rD5Ay8C6osqlG4gB2NNyw4xCV5KwgWbyx8h27/b0EOB+31tGY61jy/Y9K08b4uDVYCl+wz9yimc9ovG7mt1iP6xDMBFbY2rZvSH/to3rUWWXGwNvtUWxdSCaJ5OpRuix/VfhcLLALwMSmqu7R7ZZ8vHBoeXfjTRZ/E1kGlI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728343037; c=relaxed/simple; bh=I0ZAbMgV2otcNfQh3EcfteK8gPIcaI9eNkGtF2GytF8=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=DV2ovEe9KMvial+KArVBVa0xRjaR3XJcGYHfCVSQIwW7cPlZ/by1pmGf9bEaXSfMQae7cIijNOQqAwxaXNubESKhs6F6OwVmGu5LgedkKUCMYEEBa1yzcLBEcYOAKMEQ61jUnmWw/sAI6XhxEnzBKivrNOD0G43J4JP4qLCPwY0= 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=dH3xG4V7; arc=none smtp.client-ip=192.198.163.8 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="dH3xG4V7" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1728343034; x=1759879034; h=from:date:subject:mime-version:content-transfer-encoding: message-id:references:in-reply-to:to:cc; bh=I0ZAbMgV2otcNfQh3EcfteK8gPIcaI9eNkGtF2GytF8=; b=dH3xG4V7Z4Amcnm7MeLv5BLlKNWn/G0dBNg/pNEWWSDJG5o2kGOWOkgC WNsmvSg6aAM7h6pYzQjh6LsAXjSv8PrEvof/+evXPoinpSQDgXWi4tO4/ uni9tSmt9uuB38WCMigwCO8Yy/xe2rMU0HGi+dOfqUn/iyuT2EbdLtUkG dM1arQYmzVidkkzrcta8mMxQo/LYgy7GyOavU8IqvTrb2vYw8UMe3dAgs bGFSFWhVY7l2vk+C4A4U3dUQYj6nWqUmv3W5Hb97IJhI5lnHRc+OIp6ag 8B0V/UJv6YsSvbQkURBKAdYLgBZU9YkfyrX/9tTJ5s/AL+IEl9HdXZnzt A==; X-CSE-ConnectionGUID: 9fUSxqshSU2UZamZ/+s6Hw== X-CSE-MsgGUID: IE9ck48fTdOchxLfYdZVBA== X-IronPort-AV: E=McAfee;i="6700,10204,11218"; a="45036918" X-IronPort-AV: E=Sophos;i="6.11,185,1725346800"; d="scan'208";a="45036918" Received: from fmviesa007.fm.intel.com ([10.60.135.147]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Oct 2024 16:16:53 -0700 X-CSE-ConnectionGUID: CMDbu9WvTCqYAyvmDgwVAg== X-CSE-MsgGUID: /Ps28Cl+QHWnJPvToRt7jg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,185,1725346800"; d="scan'208";a="75309111" Received: from ldmartin-desk2.corp.intel.com (HELO localhost) ([10.125.110.112]) by fmviesa007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Oct 2024 16:16:50 -0700 From: ira.weiny@intel.com Date: Mon, 07 Oct 2024 18:16:19 -0500 Subject: [PATCH v4 13/28] cxl/mem: Expose DCD partition capabilities in sysfs Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241007-dcd-type2-upstream-v4-13-c261ee6eeded@intel.com> References: <20241007-dcd-type2-upstream-v4-0-c261ee6eeded@intel.com> In-Reply-To: <20241007-dcd-type2-upstream-v4-0-c261ee6eeded@intel.com> To: Dave Jiang , Fan Ni , Jonathan Cameron , Navneet Singh , 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-doc@vger.kernel.org, nvdimm@lists.linux.dev, linux-kernel@vger.kernel.org X-Mailer: b4 0.15-dev-37811 X-Developer-Signature: v=1; a=ed25519-sha256; t=1728342968; l=8416; i=ira.weiny@intel.com; s=20221211; h=from:subject:message-id; bh=rasv04aJpGFTO/AOxfFKRee4+yO+8zO1yJogVVWRuYs=; b=S/XMtvpR6yhSciT7hPThkBKdCqDXaqdl65AK+jNTymooTIcTmVu9rZ7bmxoBtk8fR8TpPqbIQ 2nM4pwbyReTBp9c7oMy1pvgfDuw/6e3Wih9ryjRUsne4m9neNF+sS3z X-Developer-Key: i=ira.weiny@intel.com; a=ed25519; pk=noldbkG+Wp1qXRrrkfY1QJpDf7QsOEthbOT7vm0PqsE= From: Navneet Singh To properly configure CXL regions on Dynamic Capacity Devices (DCD), user space will need to know the details of the DC partitions available. Expose dynamic capacity capabilities through sysfs. Signed-off-by: Navneet Singh Co-developed-by: Ira Weiny Signed-off-by: Ira Weiny Reviewed-by: Jonathan Cameron --- Changes: [iweiny: Change .../memX/dc/* to .../memX/dcY/*] [iweiny: add read only and shareable attributes from DSMAS] [djiang: Split sysfs docs] [iweiny: Adjust sysfs doc dates] [iweiny: Add qos details] --- Documentation/ABI/testing/sysfs-bus-cxl | 45 ++++++++++++ drivers/cxl/core/memdev.c | 126 ++++++++++++++++++++++++++++= ++++ 2 files changed, 171 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-cxl b/Documentation/ABI/te= sting/sysfs-bus-cxl index 3f5627a1210a..b865eefdb74c 100644 --- a/Documentation/ABI/testing/sysfs-bus-cxl +++ b/Documentation/ABI/testing/sysfs-bus-cxl @@ -54,6 +54,51 @@ Description: identically named field in the Identify Memory Device Output Payload in the CXL-2.0 specification. =20 +What: /sys/bus/cxl/devices/memX/dcY/size +Date: December, 2024 +KernelVersion: v6.13 +Contact: linux-cxl@vger.kernel.org +Description: + (RO) Dynamic Capacity (DC) region information. Devices only + export dcY if DCD partition Y is supported. + dcY/size is the size of each of those partitions. + +What: /sys/bus/cxl/devices/memX/dcY/read_only +Date: December, 2024 +KernelVersion: v6.13 +Contact: linux-cxl@vger.kernel.org +Description: + (RO) Dynamic Capacity (DC) region information. Devices only + export dcY if DCD partition Y is supported. + dcY/read_only indicates true if the region is exported + read_only from the device. + +What: /sys/bus/cxl/devices/memX/dcY/shareable +Date: December, 2024 +KernelVersion: v6.13 +Contact: linux-cxl@vger.kernel.org +Description: + (RO) Dynamic Capacity (DC) region information. Devices only + export dcY if DCD partition Y is supported. + dcY/shareable indicates true if the region is exported + shareable from the device. + +What: /sys/bus/cxl/devices/memX/dcY/qos_class +Date: December, 2024 +KernelVersion: v6.13 +Contact: linux-cxl@vger.kernel.org +Description: + (RO) Dynamic Capacity (DC) region information. Devices only + export dcY if DCD partition Y is supported. For CXL host + platforms that support "QoS Telemmetry" this attribute conveys + a comma delimited list of platform specific cookies that + identifies a QoS performance class for the persistent partition + of the CXL mem device. These class-ids can be compared against + a similar "qos_class" published for a root decoder. While it is + not required that the endpoints map their local memory-class to + a matching platform class, mismatches are not recommended and + there are platform specific performance related side-effects + that may result. First class-id is displayed. =20 What: /sys/bus/cxl/devices/memX/pmem/qos_class Date: May, 2023 diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c index 84fefb76dafa..2565b10a769c 100644 --- a/drivers/cxl/core/memdev.c +++ b/drivers/cxl/core/memdev.c @@ -2,6 +2,7 @@ /* Copyright(c) 2020 Intel Corporation. */ =20 #include +#include #include #include #include @@ -449,6 +450,123 @@ static struct attribute *cxl_memdev_security_attribut= es[] =3D { NULL, }; =20 +static ssize_t show_size_dcN(struct cxl_memdev *cxlmd, char *buf, int pos) +{ + struct cxl_memdev_state *mds =3D to_cxl_memdev_state(cxlmd->cxlds); + + return sysfs_emit(buf, "%#llx\n", mds->dc_region[pos].decode_len); +} + +static ssize_t show_read_only_dcN(struct cxl_memdev *cxlmd, char *buf, int= pos) +{ + struct cxl_memdev_state *mds =3D to_cxl_memdev_state(cxlmd->cxlds); + + return sysfs_emit(buf, "%s\n", + str_false_true(mds->dc_region[pos].read_only)); +} + +static ssize_t show_shareable_dcN(struct cxl_memdev *cxlmd, char *buf, int= pos) +{ + struct cxl_memdev_state *mds =3D to_cxl_memdev_state(cxlmd->cxlds); + + return sysfs_emit(buf, "%s\n", + str_false_true(mds->dc_region[pos].shareable)); +} + +static ssize_t show_qos_class_dcN(struct cxl_memdev *cxlmd, char *buf, int= pos) +{ + struct cxl_memdev_state *mds =3D to_cxl_memdev_state(cxlmd->cxlds); + + return sysfs_emit(buf, "%d\n", mds->dc_perf[pos].qos_class); +} + +#define CXL_MEMDEV_DC_ATTR_GROUP(n) \ +static ssize_t dc##n##_size_show(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ \ + return show_size_dcN(to_cxl_memdev(dev), buf, (n)); \ +} \ +struct device_attribute dc##n##_size =3D { \ + .attr =3D { .name =3D "size", .mode =3D 0444 }, \ + .show =3D dc##n##_size_show, \ +}; \ +static ssize_t dc##n##_read_only_show(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ \ + return show_read_only_dcN(to_cxl_memdev(dev), buf, (n)); \ +} \ +struct device_attribute dc##n##_read_only =3D { \ + .attr =3D { .name =3D "read_only", .mode =3D 0444 }, \ + .show =3D dc##n##_read_only_show, \ +}; \ +static ssize_t dc##n##_shareable_show(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ \ + return show_shareable_dcN(to_cxl_memdev(dev), buf, (n)); \ +} \ +struct device_attribute dc##n##_shareable =3D { \ + .attr =3D { .name =3D "shareable", .mode =3D 0444 }, \ + .show =3D dc##n##_shareable_show, \ +}; \ +static ssize_t dc##n##_qos_class_show(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ \ + return show_qos_class_dcN(to_cxl_memdev(dev), buf, (n)); \ +} \ +struct device_attribute dc##n##_qos_class =3D { \ + .attr =3D { .name =3D "qos_class", .mode =3D 0444 }, \ + .show =3D dc##n##_qos_class_show, \ +}; \ +static struct attribute *cxl_memdev_dc##n##_attributes[] =3D { \ + &dc##n##_size.attr, \ + &dc##n##_read_only.attr, \ + &dc##n##_shareable.attr, \ + &dc##n##_qos_class.attr, \ + NULL, \ +}; \ +static umode_t cxl_memdev_dc##n##_attr_visible(struct kobject *kobj, \ + struct attribute *a, \ + int pos) \ +{ \ + struct device *dev =3D kobj_to_dev(kobj); \ + struct cxl_memdev *cxlmd =3D to_cxl_memdev(dev); \ + struct cxl_memdev_state *mds =3D to_cxl_memdev_state(cxlmd->cxlds); \ + \ + /* Not a memory device */ \ + if (!mds) \ + return 0; \ + return a->mode; \ +} \ +static umode_t cxl_memdev_dc##n##_group_visible(struct kobject *kobj) \ +{ \ + struct device *dev =3D kobj_to_dev(kobj); \ + struct cxl_memdev *cxlmd =3D to_cxl_memdev(dev); \ + struct cxl_memdev_state *mds =3D to_cxl_memdev_state(cxlmd->cxlds); \ + \ + /* Not a memory device or partition not supported */ \ + if (!mds || n >=3D mds->nr_dc_region) \ + return false; \ + return true; \ +} \ +DEFINE_SYSFS_GROUP_VISIBLE(cxl_memdev_dc##n); \ +static struct attribute_group cxl_memdev_dc##n##_group =3D { \ + .name =3D "dc"#n, \ + .attrs =3D cxl_memdev_dc##n##_attributes, \ + .is_visible =3D SYSFS_GROUP_VISIBLE(cxl_memdev_dc##n), \ +} +CXL_MEMDEV_DC_ATTR_GROUP(0); +CXL_MEMDEV_DC_ATTR_GROUP(1); +CXL_MEMDEV_DC_ATTR_GROUP(2); +CXL_MEMDEV_DC_ATTR_GROUP(3); +CXL_MEMDEV_DC_ATTR_GROUP(4); +CXL_MEMDEV_DC_ATTR_GROUP(5); +CXL_MEMDEV_DC_ATTR_GROUP(6); +CXL_MEMDEV_DC_ATTR_GROUP(7); + static umode_t cxl_memdev_visible(struct kobject *kobj, struct attribute *= a, int n) { @@ -525,6 +643,14 @@ static struct attribute_group cxl_memdev_security_attr= ibute_group =3D { }; =20 static const struct attribute_group *cxl_memdev_attribute_groups[] =3D { + &cxl_memdev_dc0_group, + &cxl_memdev_dc1_group, + &cxl_memdev_dc2_group, + &cxl_memdev_dc3_group, + &cxl_memdev_dc4_group, + &cxl_memdev_dc5_group, + &cxl_memdev_dc6_group, + &cxl_memdev_dc7_group, &cxl_memdev_attribute_group, &cxl_memdev_ram_attribute_group, &cxl_memdev_pmem_attribute_group, --=20 2.46.0