From mboxrd@z Thu Jan 1 00:00:00 1970 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 30059C433EF for ; Thu, 2 Dec 2021 12:50:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1358096AbhLBMyG (ORCPT ); Thu, 2 Dec 2021 07:54:06 -0500 Received: from out30-133.freemail.mail.aliyun.com ([115.124.30.133]:57723 "EHLO out30-133.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346795AbhLBMyE (ORCPT ); Thu, 2 Dec 2021 07:54:04 -0500 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R831e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e01424;MF=xueshuai@linux.alibaba.com;NM=1;PH=DS;RN=13;SR=0;TI=SMTPD_---0UzAa6VZ_1638449438; Received: from 30.240.117.107(mailfrom:xueshuai@linux.alibaba.com fp:SMTPD_---0UzAa6VZ_1638449438) by smtp.aliyun-inc.com(127.0.0.1); Thu, 02 Dec 2021 20:50:40 +0800 Message-ID: <12b01448-0ebe-44fc-529a-6a1243acc2e3@linux.alibaba.com> Date: Thu, 2 Dec 2021 20:50:37 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Thunderbird/91.3.2 Subject: Re: [RFC PATCH v4] ACPI: Move sdei_init and ghes_init ahead to handle platform errors earlier Content-Language: en-US To: Bjorn Helgaas Cc: bp@alien8.de, tony.luck@intel.com, james.morse@arm.com, lenb@kernel.org, rjw@rjwysocki.net, bhelgaas@google.com, zhangliguang@linux.alibaba.com, zhuo.song@linux.alibaba.com, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org References: <20211126070422.73234-1-xueshuai@linux.alibaba.com> From: Shuai Xue In-Reply-To: <20211126070422.73234-1-xueshuai@linux.alibaba.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Hi, Bjron, By any chance, could you help review this patch? Any comment are welcomed. Regards, Shuai On 2021/11/26 PM3:04, Shuai Xue wrote: > On an ACPI system, ACPI is initialised very early from a subsys_initcall(), > while SDEI is not ready until a subsys_initcall_sync(). > > The SDEI driver provides functions (e.g. apei_sdei_register_ghes, > apei_sdei_unregister_ghes) to register or unregister event callback for > dispatcher in firmware. When the GHES driver probing, it registers the > corresponding callback according to the notification type specified by > GHES. If the GHES notification type is SDEI, the GHES driver will call > apei_sdei_register_ghes to register event call. > > When the firmware emits an event, it migrates the handling of the event > into the kernel at the registered entry-point __sdei_asm_handler. And > finally, the kernel will call the registered event callback and return > status_code to indicate the status of event handling. SDEI_EV_FAILED > indicates that the kernel failed to handle the event. > > Consequently, when an error occurs during kernel booting, the kernel is > unable to handle and report errors until the GHES driver is initialized by > device_initcall(), in which the event callback is registered. All errors > that occurred before GHES initialization are missed and there is no chance > to report and find them again. > > From commit e147133a42cb ("ACPI / APEI: Make hest.c manage the estatus > memory pool") was merged, ghes_init() relies on acpi_hest_init() to manage > the estatus memory pool. On the other hand, ghes_init() relies on > sdei_init() to detect the SDEI version and the framework for registering > and unregistering events. By the way, I don't figure out why acpi_hest_init > is called in acpi_pci_root_init, it don't rely on any other thing. May it > could be moved further, following acpi_iort_init in acpi_init. > > sdei_init() relies on ACPI table which is initialized subsys_initcall(): > acpi_init(), acpi_bus_init(), acpi_load_tables(), acpi_tb_laod_namespace(). > May it should be also moved further, after acpi_load_tables. > > In this patch, move sdei_init and ghes_init as far ahead as possible, right > after acpi_hest_init(). > > Signed-off-by: Shuai Xue > --- > drivers/acpi/apei/ghes.c | 18 ++++++++---------- > drivers/acpi/pci_root.c | 5 ++++- > drivers/firmware/arm_sdei.c | 13 ++----------- > include/acpi/apei.h | 2 ++ > include/linux/arm_sdei.h | 2 ++ > 5 files changed, 18 insertions(+), 22 deletions(-) > > diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c > index 0c8330ed1ffd..b11e46fb4b3d 100644 > --- a/drivers/acpi/apei/ghes.c > +++ b/drivers/acpi/apei/ghes.c > @@ -1457,27 +1457,26 @@ static struct platform_driver ghes_platform_driver = { > .remove = ghes_remove, > }; > > -static int __init ghes_init(void) > +void __init ghes_init(void) > { > int rc; > > if (acpi_disabled) > - return -ENODEV; > + return; > > switch (hest_disable) { > case HEST_NOT_FOUND: > - return -ENODEV; > + pr_info(GHES_PFX "HEST is not found!\n"); > + return; > case HEST_DISABLED: > pr_info(GHES_PFX "HEST is not enabled!\n"); > - return -EINVAL; > + return; > default: > break; > } > > - if (ghes_disable) { > + if (ghes_disable) > pr_info(GHES_PFX "GHES is not enabled!\n"); > - return -EINVAL; > - } > > ghes_nmi_init_cxt(); > > @@ -1495,8 +1494,7 @@ static int __init ghes_init(void) > else > pr_info(GHES_PFX "Failed to enable APEI firmware first mode.\n"); > > - return 0; > + return; > err: > - return rc; > + ghes_disable = 1; > } > -device_initcall(ghes_init); > diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c > index ab2f7dfb0c44..1260bb556184 100644 > --- a/drivers/acpi/pci_root.c > +++ b/drivers/acpi/pci_root.c > @@ -23,7 +23,7 @@ > #include > #include > #include /* for acpi_hest_init() */ > - > +#include /* for sdei_init() */ > #include "internal.h" > > #define ACPI_PCI_ROOT_CLASS "pci_bridge" > @@ -946,6 +946,9 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, > void __init acpi_pci_root_init(void) > { > acpi_hest_init(); > + sdei_init(); > + ghes_init(); > + > if (acpi_pci_disabled) > return; > > diff --git a/drivers/firmware/arm_sdei.c b/drivers/firmware/arm_sdei.c > index a7e762c352f9..1e1a51510e83 100644 > --- a/drivers/firmware/arm_sdei.c > +++ b/drivers/firmware/arm_sdei.c > @@ -1059,14 +1059,14 @@ static bool __init sdei_present_acpi(void) > return true; > } > > -static int __init sdei_init(void) > +void __init sdei_init(void) > { > struct platform_device *pdev; > int ret; > > ret = platform_driver_register(&sdei_driver); > if (ret || !sdei_present_acpi()) > - return ret; > + return; > > pdev = platform_device_register_simple(sdei_driver.driver.name, > 0, NULL, 0); > @@ -1076,17 +1076,8 @@ static int __init sdei_init(void) > pr_info("Failed to register ACPI:SDEI platform device %d\n", > ret); > } > - > - return ret; > } > > -/* > - * On an ACPI system SDEI needs to be ready before HEST:GHES tries to register > - * its events. ACPI is initialised from a subsys_initcall(), GHES is initialised > - * by device_initcall(). We want to be called in the middle. > - */ > -subsys_initcall_sync(sdei_init); > - > int sdei_event_handler(struct pt_regs *regs, > struct sdei_registered_event *arg) > { > diff --git a/include/acpi/apei.h b/include/acpi/apei.h > index ece0a8af2bae..7dbd6363fda7 100644 > --- a/include/acpi/apei.h > +++ b/include/acpi/apei.h > @@ -27,8 +27,10 @@ extern int hest_disable; > extern int erst_disable; > #ifdef CONFIG_ACPI_APEI_GHES > extern bool ghes_disable; > +void __init ghes_init(void); > #else > #define ghes_disable 1 > +static inline void ghes_init(void) { return; } > #endif > > #ifdef CONFIG_ACPI_APEI > diff --git a/include/linux/arm_sdei.h b/include/linux/arm_sdei.h > index 0a241c5c911d..9c987188b692 100644 > --- a/include/linux/arm_sdei.h > +++ b/include/linux/arm_sdei.h > @@ -46,9 +46,11 @@ int sdei_unregister_ghes(struct ghes *ghes); > /* For use by arch code when CPU hotplug notifiers are not appropriate. */ > int sdei_mask_local_cpu(void); > int sdei_unmask_local_cpu(void); > +void __init sdei_init(void); > #else > static inline int sdei_mask_local_cpu(void) { return 0; } > static inline int sdei_unmask_local_cpu(void) { return 0; } > +static inline void sdei_init(void) { return ; } > #endif /* CONFIG_ARM_SDE_INTERFACE */ > > >