From patchwork Mon Jan 24 00:31:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 12721284 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 474E7C433F5 for ; Mon, 24 Jan 2022 00:31:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240617AbiAXAbT (ORCPT ); Sun, 23 Jan 2022 19:31:19 -0500 Received: from mga03.intel.com ([134.134.136.65]:62345 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235522AbiAXAbT (ORCPT ); Sun, 23 Jan 2022 19:31:19 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1642984279; x=1674520279; h=subject:from:to:cc:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=c0l8SZblXwv0B6ZZUTJUC6Gddvs4JIEh2lg9YgBwkvE=; b=ll+BFWJ+CpvRmH+g0DdzgAAGbGqahDBz7P+832NG0LbMTNX1RN9RQFoY 2YmaQJUmAmlI1gXPgA8JKNBjAVAwurw37OfAF+7WNsx77REg6FXmXpQs0 kS9amhYJ6Ec90KVL0t4oWaU43drn0KcVItWbWLYJbNP5lfGJjcbM68FC1 mTcp9Y3lMdYMvra8s7fO4P7SSkUQyvvlstHTWW5Zx3y13SV3wux958prq Qj2FuB5fEAmEAFeeDgl/ax1IIp8OR+xqVI4xEahK9+IKjjHhS4irbyLqM F0f3yTlfXHcwQOAuA5Cee8EMGMwPbSwdXsToav+kL23SDq5dMdOPlTo2C g==; X-IronPort-AV: E=McAfee;i="6200,9189,10236"; a="245879416" X-IronPort-AV: E=Sophos;i="5.88,311,1635231600"; d="scan'208";a="245879416" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Jan 2022 16:31:19 -0800 X-IronPort-AV: E=Sophos;i="5.88,311,1635231600"; d="scan'208";a="695240319" Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.54.39.25]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Jan 2022 16:31:19 -0800 Subject: [PATCH v3 30/40] cxl/pci: Emit device serial number From: Dan Williams To: linux-cxl@vger.kernel.org Cc: linux-pci@vger.kernel.org, nvdimm@lists.linux.dev Date: Sun, 23 Jan 2022 16:31:19 -0800 Message-ID: <164298427918.3018233.8524862534398549106.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <164298411792.3018233.7493009997525360044.stgit@dwillia2-desk3.amr.corp.intel.com> References: <164298411792.3018233.7493009997525360044.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-3-g996c MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Per the CXL specification (8.1.12.2 Memory Device PCIe Capabilities and Extended Capabilities) the Device Serial Number capability is mandatory. Emit it for user tooling to identify devices. Signed-off-by: Dan Williams Reviewed-by: Jonathan Cameron --- Documentation/ABI/testing/sysfs-bus-cxl | 9 +++++++++ drivers/cxl/core/memdev.c | 11 +++++++++++ drivers/cxl/cxlmem.h | 2 ++ drivers/cxl/pci.c | 1 + tools/testing/cxl/test/mem.c | 1 + 5 files changed, 24 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-cxl b/Documentation/ABI/testing/sysfs-bus-cxl index 6d8cbf3355b5..87c0e5e65322 100644 --- a/Documentation/ABI/testing/sysfs-bus-cxl +++ b/Documentation/ABI/testing/sysfs-bus-cxl @@ -25,6 +25,15 @@ Description: identically named field in the Identify Memory Device Output Payload in the CXL-2.0 specification. +What: /sys/bus/cxl/devices/memX/serial +Date: January, 2022 +KernelVersion: v5.18 +Contact: linux-cxl@vger.kernel.org +Description: + (RO) 64-bit serial number per the PCIe Device Serial Number + capability. Mandatory for CXL devices, see CXL 2.0 8.1.12.2 + Memory Device PCIe Capabilities and Extended Capabilities. + What: /sys/bus/cxl/devices/*/devtype Date: June, 2021 KernelVersion: v5.14 diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c index 61029cb7ac62..1e574b052583 100644 --- a/drivers/cxl/core/memdev.c +++ b/drivers/cxl/core/memdev.c @@ -89,7 +89,18 @@ static ssize_t pmem_size_show(struct device *dev, struct device_attribute *attr, static struct device_attribute dev_attr_pmem_size = __ATTR(size, 0444, pmem_size_show, NULL); +static ssize_t serial_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct cxl_memdev *cxlmd = to_cxl_memdev(dev); + struct cxl_dev_state *cxlds = cxlmd->cxlds; + + return sysfs_emit(buf, "%#llx\n", cxlds->serial); +} +static DEVICE_ATTR_RO(serial); + static struct attribute *cxl_memdev_attributes[] = { + &dev_attr_serial.attr, &dev_attr_firmware_version.attr, &dev_attr_payload_max.attr, &dev_attr_label_storage_size.attr, diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h index e70838e5dc17..0ba0cf8dcdbc 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -131,6 +131,7 @@ struct cxl_endpoint_dvsec_info { * @next_persistent_bytes: persistent capacity change pending device reset * @component_reg_phys: register base of component registers * @info: Cached DVSEC information about the device. + * @serial: PCIe Device Serial Number * @mbox_send: @dev specific transport for transmitting mailbox commands * @wait_media_ready: @dev specific method to await media ready * @@ -164,6 +165,7 @@ struct cxl_dev_state { resource_size_t component_reg_phys; struct cxl_endpoint_dvsec_info info; + u64 serial; int (*mbox_send)(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *cmd); int (*wait_media_ready)(struct cxl_dev_state *cxlds); diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c index 513cb0e2a70a..9252e1f4b18c 100644 --- a/drivers/cxl/pci.c +++ b/drivers/cxl/pci.c @@ -557,6 +557,7 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) if (IS_ERR(cxlds)) return PTR_ERR(cxlds); + cxlds->serial = pci_get_dsn(pdev); cxlds->cxl_dvsec = pci_find_dvsec_capability( pdev, PCI_DVSEC_VENDOR_ID_CXL, CXL_DVSEC); if (!cxlds->cxl_dvsec) { diff --git a/tools/testing/cxl/test/mem.c b/tools/testing/cxl/test/mem.c index 3af3f94de0c3..36ef337c775c 100644 --- a/tools/testing/cxl/test/mem.c +++ b/tools/testing/cxl/test/mem.c @@ -268,6 +268,7 @@ static int cxl_mock_mem_probe(struct platform_device *pdev) if (IS_ERR(cxlds)) return PTR_ERR(cxlds); + cxlds->serial = pdev->id; cxlds->mbox_send = cxl_mock_mbox_send; cxlds->wait_media_ready = cxl_mock_wait_media_ready; cxlds->payload_size = SZ_4K;