From patchwork Thu Sep 29 00:10:09 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Verma, Vishal L" X-Patchwork-Id: 9355431 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0B85F6086A for ; Thu, 29 Sep 2016 00:13:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EF52B294B1 for ; Thu, 29 Sep 2016 00:13:03 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E38EC296B5; Thu, 29 Sep 2016 00:13:03 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6F571294B1 for ; Thu, 29 Sep 2016 00:13:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753227AbcI2ANC (ORCPT ); Wed, 28 Sep 2016 20:13:02 -0400 Received: from mga03.intel.com ([134.134.136.65]:58215 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752529AbcI2ANB (ORCPT ); Wed, 28 Sep 2016 20:13:01 -0400 Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga103.jf.intel.com with ESMTP; 28 Sep 2016 17:11:04 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.30,412,1470726000"; d="scan'208";a="14817481" Received: from omniknight.lm.intel.com ([10.232.112.53]) by orsmga004.jf.intel.com with ESMTP; 28 Sep 2016 17:11:01 -0700 From: Vishal Verma To: Cc: Dan Williams , Ross Zwisler , Linda Knippers , , "Rafael J. Wysocki" , Vishal Verma Subject: [PATCH 1/3] nfit: don't start a full scrub by default for an MCE Date: Wed, 28 Sep 2016 18:10:09 -0600 Message-Id: <1475107811-8880-2-git-send-email-vishal.l.verma@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1475107811-8880-1-git-send-email-vishal.l.verma@intel.com> References: <1475107811-8880-1-git-send-email-vishal.l.verma@intel.com> Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Starting a full Address Range Scrub (ARS) on hitting a memory error machine check exception may not always be desirable. Provide a way through sysfs to toggle the behavior between just adding the address (cache line) where the MCE happened to the poison list and doing a full scrub. The former (selective insertion of the address) is done unconditionally. Cc: linux-acpi@vger.kernel.org Cc: Dan Williams Cc: Linda Knippers Cc: Rafael J. Wysocki Signed-off-by: Vishal Verma --- drivers/acpi/nfit/core.c | 23 ++++++++++++++++++++--- drivers/acpi/nfit/mce.c | 24 +++++++++++++++++++----- drivers/acpi/nfit/nfit.h | 6 ++++++ 3 files changed, 45 insertions(+), 8 deletions(-) diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index 80cc7c0..ec1069e 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -901,6 +901,14 @@ static ssize_t scrub_show(struct device *dev, return rc; } +/* + * The 'scrub' attribute can only have following values written to it: + * '1': Start an on-demand scrub, and enable a full scrub to happen if a + * machine check exception for a memory error is received. + * '2': Switch to the default mode where a machine check will only insert + * the address on which the memory error was received into the poison + * and badblocks lists. + */ static ssize_t scrub_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t size) { @@ -911,15 +919,24 @@ static ssize_t scrub_store(struct device *dev, rc = kstrtol(buf, 0, &val); if (rc) return rc; - if (val != 1) - return -EINVAL; device_lock(dev); nd_desc = dev_get_drvdata(dev); if (nd_desc) { struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc); - rc = acpi_nfit_ars_rescan(acpi_desc); + switch (val) { + case MCE_SCRUB_ON: + rc = acpi_nfit_ars_rescan(acpi_desc); + acpi_desc->scrub_mode = MCE_SCRUB_ON; + break; + case MCE_SCRUB_OFF: + acpi_desc->scrub_mode = MCE_SCRUB_OFF; + break; + default: + rc = -EINVAL; + break; + } } device_unlock(dev); if (rc) diff --git a/drivers/acpi/nfit/mce.c b/drivers/acpi/nfit/mce.c index 161f915..05005e2 100644 --- a/drivers/acpi/nfit/mce.c +++ b/drivers/acpi/nfit/mce.c @@ -14,6 +14,7 @@ */ #include #include +#include #include #include "nfit.h" @@ -62,12 +63,25 @@ static int nfit_handle_mce(struct notifier_block *nb, unsigned long val, } mutex_unlock(&acpi_desc->init_mutex); - /* - * We can ignore an -EBUSY here because if an ARS is already - * in progress, just let that be the last authoritative one - */ - if (found_match) + if (!found_match) + continue; + + /* If this fails due to an -ENOMEM, there is little we can do */ + nvdimm_bus_add_poison(acpi_desc->nvdimm_bus, + ALIGN(mce->addr, L1_CACHE_BYTES), + L1_CACHE_BYTES); + nvdimm_region_notify(nfit_spa->nd_region, + NVDIMM_REVALIDATE_POISON); + + if (acpi_desc->scrub_mode == MCE_SCRUB_ON) { + /* + * We can ignore an -EBUSY here because if an ARS is + * already in progress, just let that be the last + * authoritative one + */ acpi_nfit_ars_rescan(acpi_desc); + } + break; } mutex_unlock(&acpi_desc_lock); diff --git a/drivers/acpi/nfit/nfit.h b/drivers/acpi/nfit/nfit.h index e894ded..487dc0a 100644 --- a/drivers/acpi/nfit/nfit.h +++ b/drivers/acpi/nfit/nfit.h @@ -152,6 +152,7 @@ struct acpi_nfit_desc { struct list_head list; struct kernfs_node *scrub_count_state; unsigned int scrub_count; + unsigned int scrub_mode; unsigned int cancel:1; unsigned long dimm_cmd_force_en; unsigned long bus_cmd_force_en; @@ -159,6 +160,11 @@ struct acpi_nfit_desc { void *iobuf, u64 len, int rw); }; +enum scrub_mode { + MCE_SCRUB_ON = 1, + MCE_SCRUB_OFF = 2, +}; + enum nd_blk_mmio_selector { BDW, DCR,