From patchwork Tue Oct 18 08:22:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jia He X-Patchwork-Id: 13010128 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 74561C43217 for ; Tue, 18 Oct 2022 08:28:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230151AbiJRI2P (ORCPT ); Tue, 18 Oct 2022 04:28:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53508 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231137AbiJRI1y (ORCPT ); Tue, 18 Oct 2022 04:27:54 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id B8B319AFA1; Tue, 18 Oct 2022 01:27:41 -0700 (PDT) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id D9F0F175D; Tue, 18 Oct 2022 01:27:46 -0700 (PDT) Received: from entos-ampere-02.shanghai.arm.com (entos-ampere-02.shanghai.arm.com [10.169.212.212]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id EE1033F7D8; Tue, 18 Oct 2022 01:27:33 -0700 (PDT) From: Jia He To: Ard Biesheuvel , Len Brown , Tony Luck , Borislav Petkov , Mauro Carvalho Chehab , Robert Richter , Robert Moore , Qiuxu Zhuo , Yazen Ghannam , Jan Luebbe , Khuong Dinh , Kani Toshi Cc: James Morse , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-edac@vger.kernel.org, devel@acpica.org, "Rafael J . Wysocki" , Shuai Xue , Jarkko Sakkinen , linux-efi@vger.kernel.org, nd@arm.com, Peter Zijlstra , Jia He Subject: [PATCH v10 4/7] EDAC/ghes: Make ghes_edac a proper module to remove the dependency on ghes Date: Tue, 18 Oct 2022 08:22:11 +0000 Message-Id: <20221018082214.569504-5-justin.he@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221018082214.569504-1-justin.he@arm.com> References: <20221018082214.569504-1-justin.he@arm.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-edac@vger.kernel.org Commit dc4e8c07e9e2 ("ACPI: APEI: explicit init of HEST and GHES in apci_init()") introduced a bug that ghes_edac_register() would be invoked before edac_init(). Because at that time, the bus "edac" hadn't been even registered, this created sysfs /devices/mc0 instead of /sys/devices/system/edac/mc/mc0 on an Ampere eMag server. To remove the dependency of ghes_edac on ghes, make it a proper module. Use a list to save the probing devices in ghes_probe(), and defer the ghes_edac_register() to module_init() of the new ghes_edac module by iterating over the devices list. Co-developed-by: Borislav Petkov Signed-off-by: Borislav Petkov Signed-off-by: Jia He Fixes: dc4e8c07e9e2 ("ACPI: APEI: explicit init of HEST and GHES in apci_init()") Cc: Shuai Xue --- drivers/acpi/apei/ghes.c | 4 ---- drivers/edac/Kconfig | 4 ++-- drivers/edac/ghes_edac.c | 40 ++++++++++++++++++++++++++++++++++++++-- include/acpi/ghes.h | 22 ++-------------------- 4 files changed, 42 insertions(+), 28 deletions(-) diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c index 6a0dcb8c0901..27c72b175e4b 100644 --- a/drivers/acpi/apei/ghes.c +++ b/drivers/acpi/apei/ghes.c @@ -1388,8 +1388,6 @@ static int ghes_probe(struct platform_device *ghes_dev) platform_set_drvdata(ghes_dev, ghes); - ghes_edac_register(ghes, &ghes_dev->dev); - ghes->dev = &ghes_dev->dev; mutex_lock(&ghes_devs_mutex); @@ -1458,8 +1456,6 @@ static int ghes_remove(struct platform_device *ghes_dev) ghes_fini(ghes); - ghes_edac_unregister(ghes); - mutex_lock(&ghes_devs_mutex); list_del(&ghes->elist); mutex_unlock(&ghes_devs_mutex); diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig index 17562cf1fe97..df45db81858b 100644 --- a/drivers/edac/Kconfig +++ b/drivers/edac/Kconfig @@ -53,8 +53,8 @@ config EDAC_DECODE_MCE has been initialized. config EDAC_GHES - bool "Output ACPI APEI/GHES BIOS detected errors via EDAC" - depends on ACPI_APEI_GHES && (EDAC=y) + tristate "Output ACPI APEI/GHES BIOS detected errors via EDAC" + depends on ACPI_APEI_GHES select UEFI_CPER help Not all machines support hardware-driven error report. Some of those diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c index b85a545d1cb0..dec1bb96e4b3 100644 --- a/drivers/edac/ghes_edac.c +++ b/drivers/edac/ghes_edac.c @@ -56,6 +56,8 @@ static DEFINE_SPINLOCK(ghes_lock); static bool system_scanned; +static struct list_head *ghes_devs; + /* Memory Device - Type 17 of SMBIOS spec */ struct memdev_dmi_entry { u8 type; @@ -383,7 +385,7 @@ static struct notifier_block ghes_edac_mem_err_nb = { .priority = 0, }; -int ghes_edac_register(struct ghes *ghes, struct device *dev) +static int ghes_edac_register(struct device *dev) { bool fake = false; struct mem_ctl_info *mci; @@ -502,7 +504,7 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev) return rc; } -void ghes_edac_unregister(struct ghes *ghes) +static void ghes_edac_unregister(struct ghes *ghes) { struct mem_ctl_info *mci; unsigned long flags; @@ -535,3 +537,37 @@ void ghes_edac_unregister(struct ghes *ghes) unlock: mutex_unlock(&ghes_reg_mutex); } + +static int __init ghes_edac_init(void) +{ + struct ghes *g, *g_tmp; + + ghes_devs = ghes_get_devices(); + if (!ghes_devs) + return -ENODEV; + + if (list_empty(ghes_devs)) { + pr_info("GHES probing device list is empty"); + return -ENODEV; + } + + list_for_each_entry_safe(g, g_tmp, ghes_devs, elist) { + ghes_edac_register(g->dev); + } + + return 0; +} +module_init(ghes_edac_init); + +static void __exit ghes_edac_exit(void) +{ + struct ghes *g, *g_tmp; + + list_for_each_entry_safe(g, g_tmp, ghes_devs, elist) { + ghes_edac_unregister(g); + } +} +module_exit(ghes_edac_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Output ACPI APEI/GHES BIOS detected errors module via EDAC"); diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h index ce693e9f07a0..2e785d3554d8 100644 --- a/include/acpi/ghes.h +++ b/include/acpi/ghes.h @@ -71,32 +71,14 @@ int ghes_register_vendor_record_notifier(struct notifier_block *nb); * @nb: pointer to the notifier_block structure of the vendor record handler. */ void ghes_unregister_vendor_record_notifier(struct notifier_block *nb); -#endif - -int ghes_estatus_pool_init(int num_ghes); - -/* From drivers/edac/ghes_edac.c */ - -#ifdef CONFIG_EDAC_GHES -int ghes_edac_register(struct ghes *ghes, struct device *dev); - -void ghes_edac_unregister(struct ghes *ghes); struct list_head *ghes_get_devices(void); - #else -static inline int ghes_edac_register(struct ghes *ghes, struct device *dev) -{ - return -ENODEV; -} - -static inline void ghes_edac_unregister(struct ghes *ghes) -{ -} - static inline struct list_head *ghes_get_devices(void) { return NULL; } #endif +int ghes_estatus_pool_init(int num_ghes); + static inline int acpi_hest_get_version(struct acpi_hest_generic_data *gdata) { return gdata->revision >> 8;