Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752655AbdHRT5B (ORCPT ); Fri, 18 Aug 2017 15:57:01 -0400 Received: from g2t2353.austin.hpe.com ([15.233.44.26]:32994 "EHLO g2t2353.austin.hpe.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752484AbdHRT4j (ORCPT ); Fri, 18 Aug 2017 15:56:39 -0400 From: Toshi Kani To: rjw@rjwysocki.net, bp@alien8.de Cc: mchehab@kernel.org, tony.luck@intel.com, lenb@kernel.org, linux-acpi@vger.kernel.org, linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org, Toshi Kani Subject: [PATCH v3 3/5] ghes_edac: add platform check to enable ghes_edac Date: Fri, 18 Aug 2017 13:46:42 -0600 Message-Id: <20170818194644.14538-4-toshi.kani@hpe.com> X-Mailer: git-send-email 2.9.4 In-Reply-To: <20170818194644.14538-1-toshi.kani@hpe.com> References: <20170818194644.14538-1-toshi.kani@hpe.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3732 Lines: 94 The ghes_edac driver was introduced in 2013 [1], but it has not been enabled by any distro yet. This driver obtains error info from firmware interfaces, which are not properly implemented on many platforms, as the driver always emits the messages below: This EDAC driver relies on BIOS to enumerate memory and get error reports. Unfortunately, not all BIOSes reflect the memory layout correctly So, the end result of using this driver varies from vendor to vendor If you find incorrect reports, please contact your hardware vendor to correct its BIOS. To get out from this situation, add a platform check to selectively enable the driver on the platforms that are known to have proper firmware implementation. Platform vendors can add their platforms to the list when they support ghes_edac. "ghes_edac.force_load=1" skips this platform check. [1]: https://lwn.net/Articles/538438/ Signed-off-by: Toshi Kani Cc: Borislav Petkov Cc: Mauro Carvalho Chehab Cc: Tony Luck --- drivers/edac/ghes_edac.c | 28 +++++++++++++++++++++++----- 1 file changed, 23 insertions(+), 5 deletions(-) diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c index 4e61a62..367e106 100644 --- a/drivers/edac/ghes_edac.c +++ b/drivers/edac/ghes_edac.c @@ -34,6 +34,9 @@ static LIST_HEAD(ghes_reglist); static DEFINE_MUTEX(ghes_edac_lock); static int ghes_edac_mc_num; +/* Set 1 to skip the platform check */ +static bool __read_mostly ghes_edac_force_load; +module_param_named(force_load, ghes_edac_force_load, bool, 0); /* Memory Device - Type 17 of SMBIOS spec */ struct memdev_dmi_entry { @@ -405,6 +408,15 @@ void ghes_edac_report_mem_error(struct ghes *ghes, int sev, } EXPORT_SYMBOL_GPL(ghes_edac_report_mem_error); +/* + * Known systems that are safe to enable this module. + * "ghes_edac.force_load=1" skips this check if necessary. + */ +static struct acpi_platform_list plat_list[] = { + {"HPE ", "Server ", 0, ACPI_SIG_FADT, all_versions}, + { } /* End */ +}; + int ghes_edac_register(struct ghes *ghes, struct device *dev) { bool fake = false; @@ -413,6 +425,12 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev) struct edac_mc_layer layers[1]; struct ghes_edac_pvt *pvt; struct ghes_edac_dimm_fill dimm_fill; + int idx; + + /* Check if safe to enable on this system */ + idx = acpi_match_platform_list(plat_list); + if (!ghes_edac_force_load && idx < 0) + return 0; /* Get the number of DIMMs */ dmi_walk(ghes_edac_count_dimms, &num_dimm); @@ -456,7 +474,11 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev) mci->dev_name = "ghes"; if (!ghes_edac_mc_num) { - if (!fake) { + if (fake) { + pr_info("This system has a very crappy BIOS: It doesn't even list the DIMMS.\n"); + pr_info("Its SMBIOS info is wrong. It is doubtful that the error report would\n"); + pr_info("work on such system. Use this driver with caution\n"); + } else if (idx < 0) { pr_info("This EDAC driver relies on BIOS to enumerate memory and get error reports.\n"); pr_info("Unfortunately, not all BIOSes reflect the memory layout correctly.\n"); pr_info("So, the end result of using this driver varies from vendor to vendor.\n"); @@ -464,10 +486,6 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev) pr_info("to correct its BIOS.\n"); pr_info("This system has %d DIMM sockets.\n", num_dimm); - } else { - pr_info("This system has a very crappy BIOS: It doesn't even list the DIMMS.\n"); - pr_info("Its SMBIOS info is wrong. It is doubtful that the error report would\n"); - pr_info("work on such system. Use this driver with caution\n"); } }