From 77c5f5d2f212e1963063e427fc57c44bf6eae9fb Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Fri, 15 Feb 2013 06:11:57 -0300 Subject: [PATCH] ghes_edac: Register at EDAC core the BIOS report Register GHES at EDAC MC core, in order to avoid other drivers to also handle errors and mangle with error data. The edac core will warrant that just one driver will be used, so the first one to register (BIOS first) will be the one that will be reporting the hardware errors. For now, the EDAC driver does nothing but to register at the EDAC core, preventing the hardware-driven mechanism to interfere with GHES. Signed-off-by: Mauro Carvalho Chehab --- MAINTAINERS | 7 +++ drivers/edac/Kconfig | 23 ++++++++ drivers/edac/Makefile | 1 + drivers/edac/ghes_edac.c | 114 +++++++++++++++++++++++++++++++++++++++ 4 files changed, 145 insertions(+) create mode 100644 drivers/edac/ghes_edac.c diff --git a/MAINTAINERS b/MAINTAINERS index 35a56bcd5e75..889644d9772b 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2803,6 +2803,13 @@ W: bluesmoke.sourceforge.net S: Maintained F: drivers/edac/e7xxx_edac.c +EDAC-GHES +M: Mauro Carvalho Chehab +L: linux-edac@vger.kernel.org +W: bluesmoke.sourceforge.net +S: Maintained +F: drivers/edac/ghes-edac.c + EDAC-I82443BXGX M: Tim Small L: linux-edac@vger.kernel.org diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig index 66719925970f..7e38e5e576e8 100644 --- a/drivers/edac/Kconfig +++ b/drivers/edac/Kconfig @@ -80,6 +80,29 @@ config EDAC_MM_EDAC occurred so that a particular failing memory module can be replaced. If unsure, select 'Y'. +config EDAC_GHES + bool "Output ACPI APEI/GHES BIOS detected errors via EDAC" + depends on ACPI_APEI_GHES && (EDAC_MM_EDAC=y) + default y + help + Not all machines support hardware-driven error report. Some of those + provide a BIOS-driven error report mechanism via ACPI, using the + APEI/GHES driver. By enabling this option, the error reports provided + by GHES are sent to userspace via the EDAC API. + + When this option is enabled, it will disable the hardware-driven + mechanisms, if a GHES BIOS is detected, entering into the + "Firmware First" mode. + + It should be noticed that keeping both GHES and a hardware-driven + error mechanism won't work well, as BIOS will race with OS, while + reading the error registers. So, if you want to not use "Firmware + first" GHES error mechanism, you should disable GHES either at + compilation time or by passing "ghes.disable=1" Kernel parameter + at boot time. + + In doubt, say 'Y'. + config EDAC_AMD64 tristate "AMD64 (Opteron, Athlon64) K8, F10h" depends on EDAC_MM_EDAC && AMD_NB && X86_64 && EDAC_DECODE_MCE diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile index 5608a9ba61b7..4154ed6a02c6 100644 --- a/drivers/edac/Makefile +++ b/drivers/edac/Makefile @@ -16,6 +16,7 @@ ifdef CONFIG_PCI edac_core-y += edac_pci.o edac_pci_sysfs.o endif +obj-$(CONFIG_EDAC_GHES) += ghes_edac.o obj-$(CONFIG_EDAC_MCE_INJ) += mce_amd_inj.o edac_mce_amd-y := mce_amd.o diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c new file mode 100644 index 000000000000..d8e54b496e0f --- /dev/null +++ b/drivers/edac/ghes_edac.c @@ -0,0 +1,114 @@ +/* + * GHES/EDAC Linux driver + * + * This file may be distributed under the terms of the GNU General Public + * License version 2. + * + * Copyright (c) 2013 by Mauro Carvalho Chehab + * + * Red Hat Inc. http://www.redhat.com + */ + +#include +#include +#include "edac_core.h" + +#define GHES_PFX "ghes_edac: " +#define GHES_EDAC_REVISION " Ver: 1.0.0" + +struct ghes_edac_pvt { + struct list_head list; + struct ghes *ghes; + struct mem_ctl_info *mci; +}; + +static LIST_HEAD(ghes_reglist); +static DEFINE_MUTEX(ghes_edac_lock); +static int ghes_edac_mc_num; + +void ghes_edac_report_mem_error(struct ghes *ghes, int sev, + struct cper_sec_mem_err *mem_err) +{ +} +EXPORT_SYMBOL_GPL(ghes_edac_report_mem_error); + +int ghes_edac_register(struct ghes *ghes, struct device *dev) +{ + int rc; + struct mem_ctl_info *mci; + struct edac_mc_layer layers[1]; + struct csrow_info *csrow; + struct dimm_info *dimm; + struct ghes_edac_pvt *pvt; + + layers[0].type = EDAC_MC_LAYER_ALL_MEM; + layers[0].size = 1; + layers[0].is_virt_csrow = true; + + /* + * We need to serialize edac_mc_alloc() and edac_mc_add_mc(), + * to avoid duplicated memory controller numbers + */ + mutex_lock(&ghes_edac_lock); + mci = edac_mc_alloc(ghes_edac_mc_num, ARRAY_SIZE(layers), layers, + sizeof(*pvt)); + if (!mci) { + pr_info(GHES_PFX "Can't allocate memory for EDAC data\n"); + mutex_unlock(&ghes_edac_lock); + return -ENOMEM; + } + + pvt = mci->pvt_info; + memset(pvt, 0, sizeof(*pvt)); + list_add_tail(&pvt->list, &ghes_reglist); + pvt->ghes = ghes; + pvt->mci = mci; + mci->pdev = dev; + + mci->mtype_cap = MEM_FLAG_EMPTY; + mci->edac_ctl_cap = EDAC_FLAG_NONE; + mci->edac_cap = EDAC_FLAG_NONE; + mci->mod_name = "ghes_edac.c"; + mci->mod_ver = GHES_EDAC_REVISION; + mci->ctl_name = "ghes_edac"; + mci->dev_name = "ghes"; + + csrow = mci->csrows[0]; + dimm = csrow->channels[0]->dimm; + + /* FIXME: FAKE DATA */ + dimm->nr_pages = 1000; + dimm->grain = 128; + dimm->mtype = MEM_UNKNOWN; + dimm->dtype = DEV_UNKNOWN; + dimm->edac_mode = EDAC_SECDED; + + rc = edac_mc_add_mc(mci); + if (rc < 0) { + pr_info(GHES_PFX "Can't register at EDAC core\n"); + edac_mc_free(mci); + mutex_unlock(&ghes_edac_lock); + return -ENODEV; + } + + ghes_edac_mc_num++; + mutex_unlock(&ghes_edac_lock); + return 0; +} +EXPORT_SYMBOL_GPL(ghes_edac_register); + +void ghes_edac_unregister(struct ghes *ghes) +{ + struct mem_ctl_info *mci; + struct ghes_edac_pvt *pvt; + + list_for_each_entry(pvt, &ghes_reglist, list) { + if (ghes == pvt->ghes) { + mci = pvt->mci; + edac_mc_del_mc(mci->pdev); + edac_mc_free(mci); + list_del(&pvt->list); + } + } +} +EXPORT_SYMBOL_GPL(ghes_edac_unregister);