From patchwork Thu Dec 15 21:17:45 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alison Schofield X-Patchwork-Id: 13074530 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 E777BC4332F for ; Thu, 15 Dec 2022 21:18:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230019AbiLOVSH (ORCPT ); Thu, 15 Dec 2022 16:18:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55800 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229991AbiLOVSD (ORCPT ); Thu, 15 Dec 2022 16:18:03 -0500 Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C9E0655A8B; Thu, 15 Dec 2022 13:18:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1671139081; x=1702675081; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=v6DX+flXm++eiMCOQrPkWRYABHnX0vxtX2uRfeiLesU=; b=AOq/H945rYgjJZ+WAXwbNDGviMZYNh0w7+REOIcQ6hH/t1QZZml8PhMM 4uPB61WTjWVBljiQe0GpcPre+pGlXLJiInlvyTPNR2xMw1sn2oxY115+I RJFqrrJaAB1ZdJCCbkQZIPAwTFPoRpJBielr77aiFkoyLzx38D6ZN1U88 iQQf9SkwWysioSUdhG4I/N2Ymvc8J2+fyaZldlQGXZuUk0WQNrSoUchdg 6KmZZXdfPyZbRdbyfEM/AriDcWTMC7THSS0I8jA9c5sLhtEp9uzuhEUFO HO0HC424PWqL6PFNxRwQ7WJ9o92y+fqjwZ0jaa+bfSt8P80K/xituQl1s w==; X-IronPort-AV: E=McAfee;i="6500,9779,10562"; a="302230302" X-IronPort-AV: E=Sophos;i="5.96,248,1665471600"; d="scan'208";a="302230302" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Dec 2022 13:17:52 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10562"; a="649570083" X-IronPort-AV: E=Sophos;i="5.96,248,1665471600"; d="scan'208";a="649570083" Received: from aschofie-mobl2.amr.corp.intel.com (HELO localhost) ([10.209.55.178]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Dec 2022 13:17:51 -0800 From: alison.schofield@intel.com To: Dan Williams , Ira Weiny , Vishal Verma , Dave Jiang , Ben Widawsky , Steven Rostedt Cc: Alison Schofield , linux-cxl@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 3/5] cxl/memdev: Add trigger_poison_list sysfs attribute Date: Thu, 15 Dec 2022 13:17:45 -0800 Message-Id: <965d66486eb3ebbca6b1b265678130edd66f105e.1671135967.git.alison.schofield@intel.com> X-Mailer: git-send-email 2.37.3 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cxl@vger.kernel.org From: Alison Schofield When a boolean 'true' is written to this attribute the memdev driver retrieves the poison list from the device. The list consists of addresses that are poisoned, or would result in poison if accessed, and the source of the poison. This attribute is only visible for devices supporting the capability. The retrieved errors are logged as kernel trace events with the label 'cxl_poison'. Signed-off-by: Alison Schofield Reviewed-by: Jonathan Cameron --- Documentation/ABI/testing/sysfs-bus-cxl | 14 ++++++++ drivers/cxl/core/memdev.c | 45 +++++++++++++++++++++++++ drivers/cxl/cxlmem.h | 2 +- 3 files changed, 60 insertions(+), 1 deletion(-) diff --git a/Documentation/ABI/testing/sysfs-bus-cxl b/Documentation/ABI/testing/sysfs-bus-cxl index 8494ef27e8d2..df40ed09ea67 100644 --- a/Documentation/ABI/testing/sysfs-bus-cxl +++ b/Documentation/ABI/testing/sysfs-bus-cxl @@ -388,3 +388,17 @@ Description: 1), and checks that the hardware accepts the commit request. Reading this value indicates whether the region is committed or not. + + +What: /sys/bus/cxl/devices/memX/trigger_poison_list +Date: November, 2022 +KernelVersion: v6.2 +Contact: linux-cxl@vger.kernel.org +Description: + (WO) When a boolean 'true' is written to this attribute the + memdev driver retrieves the poison list from the device. The + list consists of addresses that are poisoned, or would result + in poison if accessed, and the source of the poison. This + attribute is only visible for devices supporting the + capability. The retrieved errors are logged as kernel + trace events with the label 'cxl_poison'. diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c index a74a93310d26..e0af7e9c9989 100644 --- a/drivers/cxl/core/memdev.c +++ b/drivers/cxl/core/memdev.c @@ -106,12 +106,49 @@ static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr, } static DEVICE_ATTR_RO(numa_node); +static ssize_t trigger_poison_list_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct cxl_memdev *cxlmd = to_cxl_memdev(dev); + struct cxl_dev_state *cxlds = cxlmd->cxlds; + u64 offset, length; + bool tmp; + int rc; + + if (kstrtobool(buf, &tmp)) + return -EINVAL; + + /* CXL 3.0 Spec 8.2.9.8.4.1 Separate pmem and ram poison requests */ + if (resource_size(&cxlds->pmem_res)) { + offset = cxlds->pmem_res.start; + length = resource_size(&cxlds->pmem_res); + rc = cxl_mem_get_poison(cxlmd, offset, length, NULL); + if (rc) + return rc; + } + if (resource_size(&cxlds->ram_res)) { + offset = cxlds->ram_res.start; + length = resource_size(&cxlds->ram_res); + rc = cxl_mem_get_poison(cxlmd, offset, length, NULL); + /* + * Invalid Physical Address is not an error for + * volatile addresses. Device support is optional. + */ + if (rc && rc != -EFAULT) + return rc; + } + return len; +} +static DEVICE_ATTR_WO(trigger_poison_list); + 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, &dev_attr_numa_node.attr, + &dev_attr_trigger_poison_list.attr, NULL, }; @@ -130,6 +167,14 @@ static umode_t cxl_memdev_visible(struct kobject *kobj, struct attribute *a, { if (!IS_ENABLED(CONFIG_NUMA) && a == &dev_attr_numa_node.attr) return 0; + + if (a == &dev_attr_trigger_poison_list.attr) { + struct device *dev = kobj_to_dev(kobj); + + if (!test_bit(CXL_MEM_COMMAND_ID_GET_POISON, + to_cxl_memdev(dev)->cxlds->enabled_cmds)) + return 0; + } return a->mode; } diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h index f53fae20f502..28ba0cd8f2d3 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -139,7 +139,7 @@ struct cxl_mbox_cmd { C(FWROLLBACK, -ENXIO, "rolled back to the previous active FW"), \ C(FWRESET, -ENXIO, "FW failed to activate, needs cold reset"), \ C(HANDLE, -ENXIO, "one or more Event Record Handles were invalid"), \ - C(PADDR, -ENXIO, "physical address specified is invalid"), \ + C(PADDR, -EFAULT, "physical address specified is invalid"), \ C(POISONLMT, -ENXIO, "poison injection limit has been reached"), \ C(MEDIAFAILURE, -ENXIO, "permanent issue with the media"), \ C(ABORT, -ENXIO, "background cmd was aborted by device"), \