Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758161AbaLJWKP (ORCPT ); Wed, 10 Dec 2014 17:10:15 -0500 Received: from mga09.intel.com ([134.134.136.24]:29310 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758098AbaLJWKO (ORCPT ); Wed, 10 Dec 2014 17:10:14 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.07,554,1413270000"; d="scan'208";a="621836241" Message-Id: <5ab8b2e0b3e41b1bb4bdee09289200e12a0dfbe4.1418248436.git.tony.luck@intel.com> In-Reply-To: <3908561D78D1C84285E8C5FCA982C28F32961DDF@ORSMSX114.amr.corp.intel.com> From: "Luck, Tony" Date: Wed, 10 Dec 2014 13:53:26 -0800 Subject: [PATCHv2] ACPI, EINJ: Enhance error injection tolerance level To: Tomasz Nowicki , CC: Borislav Petkov , Chen Gong , Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Chen, Gong" Some BIOSes utilize PCI MMCFG space read/write opertion to trigger specific errors. EINJ will report errors as below when hitting such cases: APEI: Can not request [mem 0x83f990a0-0x83f990a3] for APEI EINJ Trigger registers It is because on x86 platform ACPI based PCI MMCFG logic has reserved all MMCFG spaces so that EINJ can't reserve it again. We already trust the ACPI/APEI code when using the EINJ interface so it is not a big leap to also trust it to access the right MMCFG addresses. Skip address checking to allow the access. Signed-off-by: Chen, Gong Signed-off-by: Tony Luck --- Chen Gong still gets author credit for this. All I did was rename some "mmcfg" things to be "arch", and move the mmcfg scan routine out of apei.c and into the x86 specific mmconfig-shared.c to address Tomasz's concerns. arch/x86/pci/mmconfig-shared.c | 28 ++++++++++++++++++++++++++++ drivers/acpi/apei/apei-base.c | 35 +++++++++++++++++++++++++++++------ 2 files changed, 57 insertions(+), 6 deletions(-) diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c index 326198a4434e..c08b985f9441 100644 --- a/arch/x86/pci/mmconfig-shared.c +++ b/arch/x86/pci/mmconfig-shared.c @@ -610,6 +610,32 @@ static int __init pci_parse_mcfg(struct acpi_table_header *header) return 0; } +#ifdef CONFIG_ACPI_APEI +extern int (*arch_apei_filter_addr)(int (*func)(__u64 start, __u64 size, + void *data), void *data); + +static int pci_mmcfg_for_each_region(int (*func)(__u64 start, __u64 size, + void *data), void *data) +{ + struct pci_mmcfg_region *cfg; + int rc; + + if (list_empty(&pci_mmcfg_list)) + return 0; + + list_for_each_entry(cfg, &pci_mmcfg_list, list) { + rc = func(cfg->res.start, resource_size(&cfg->res), data); + if (rc) + return rc; + } + + return 0; +} +#define set_apei_filter() (arch_apei_filter_addr = pci_mmcfg_for_each_region) +#else +#define set_apei_filter() +#endif + static void __init __pci_mmcfg_init(int early) { pci_mmcfg_reject_broken(early); @@ -644,6 +670,8 @@ void __init pci_mmcfg_early_init(void) else acpi_sfi_table_parse(ACPI_SIG_MCFG, pci_parse_mcfg); __pci_mmcfg_init(1); + + set_apei_filter(); } } diff --git a/drivers/acpi/apei/apei-base.c b/drivers/acpi/apei/apei-base.c index 2cd7bdd6c8b3..f74779b1e035 100644 --- a/drivers/acpi/apei/apei-base.c +++ b/drivers/acpi/apei/apei-base.c @@ -41,6 +41,9 @@ #include #include #include +#ifdef CONFIG_PCI_MMCONFIG +#include +#endif #include "apei-internal.h" @@ -449,7 +452,7 @@ int apei_resources_sub(struct apei_resources *resources1, } EXPORT_SYMBOL_GPL(apei_resources_sub); -static int apei_get_nvs_callback(__u64 start, __u64 size, void *data) +static int apei_get_res_callback(__u64 start, __u64 size, void *data) { struct apei_resources *resources = data; return apei_res_add(&resources->iomem, start, size); @@ -457,7 +460,15 @@ static int apei_get_nvs_callback(__u64 start, __u64 size, void *data) static int apei_get_nvs_resources(struct apei_resources *resources) { - return acpi_nvs_for_each_region(apei_get_nvs_callback, resources); + return acpi_nvs_for_each_region(apei_get_res_callback, resources); +} + +int (*arch_apei_filter_addr)(int (*func)(__u64 start, __u64 size, + void *data), void *data); +static int apei_get_arch_resources(struct apei_resources *resources) + +{ + return arch_apei_filter_addr(apei_get_res_callback, resources); } /* @@ -470,7 +481,7 @@ int apei_resources_request(struct apei_resources *resources, { struct apei_res *res, *res_bak = NULL; struct resource *r; - struct apei_resources nvs_resources; + struct apei_resources nvs_resources, arch_res; int rc; rc = apei_resources_sub(resources, &apei_resources_all); @@ -485,10 +496,20 @@ int apei_resources_request(struct apei_resources *resources, apei_resources_init(&nvs_resources); rc = apei_get_nvs_resources(&nvs_resources); if (rc) - goto res_fini; + goto nvs_res_fini; rc = apei_resources_sub(resources, &nvs_resources); if (rc) - goto res_fini; + goto nvs_res_fini; + + if (arch_apei_filter_addr) { + apei_resources_init(&arch_res); + rc = apei_get_arch_resources(&arch_res); + if (rc) + goto arch_res_fini; + rc = apei_resources_sub(resources, &arch_res); + if (rc) + goto arch_res_fini; + } rc = -EINVAL; list_for_each_entry(res, &resources->iomem, list) { @@ -536,7 +557,9 @@ err_unmap_iomem: break; release_mem_region(res->start, res->end - res->start); } -res_fini: +arch_res_fini: + apei_resources_fini(&arch_res); +nvs_res_fini: apei_resources_fini(&nvs_resources); return rc; } -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/