From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ot0-f200.google.com (mail-ot0-f200.google.com [74.125.82.200]) by kanga.kvack.org (Postfix) with ESMTP id E8C756B0010 for ; Fri, 27 Apr 2018 11:38:54 -0400 (EDT) Received: by mail-ot0-f200.google.com with SMTP id s6-v6so1454276oth.20 for ; Fri, 27 Apr 2018 08:38:54 -0700 (PDT) Received: from foss.arm.com (foss.arm.com. [217.140.101.70]) by mx.google.com with ESMTP id v37-v6si569658otf.336.2018.04.27.08.38.53 for ; Fri, 27 Apr 2018 08:38:53 -0700 (PDT) From: James Morse Subject: [PATCH v3 09/12] firmware: arm_sdei: Add ACPI GHES registration helper Date: Fri, 27 Apr 2018 16:35:07 +0100 Message-Id: <20180427153510.5799-10-james.morse@arm.com> In-Reply-To: <20180427153510.5799-1-james.morse@arm.com> References: <20180427153510.5799-1-james.morse@arm.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-acpi@vger.kernel.org Cc: kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, Borislav Petkov , Marc Zyngier , Christoffer Dall , Will Deacon , Catalin Marinas , Naoya Horiguchi , Rafael Wysocki , Len Brown , Tony Luck , Tyler Baicar , Dongjiu Geng , Xie XiuQi , Punit Agrawal , jonathan.zhang@cavium.com, James Morse APEI's Generic Hardware Error Source structures do not describe whether the SDEI event is shared or private, as this information is discoverable via the API. GHES needs to know whether an event is normal or critical to avoid sharing locks or fixmap entries. Add a helper to ask firmware for this information so it can initialise the struct ghes and register then enable the event. Signed-off-by: James Morse Reviewed-by: Punit Agrawal --- Changes since v2: * Added header file, thanks kbuild-robot! * changed ifdef to the GHES version to match the fixmap definition Changes since v1: * ghes->fixmap_idx variable rename arch/arm64/include/asm/fixmap.h | 4 +++ drivers/firmware/arm_sdei.c | 77 +++++++++++++++++++++++++++++++++++++++++ include/linux/arm_sdei.h | 5 +++ 3 files changed, 86 insertions(+) diff --git a/arch/arm64/include/asm/fixmap.h b/arch/arm64/include/asm/fixmap.h index c3974517c2cb..e2b423a5feaf 100644 --- a/arch/arm64/include/asm/fixmap.h +++ b/arch/arm64/include/asm/fixmap.h @@ -58,6 +58,10 @@ enum fixed_addresses { #ifdef CONFIG_ACPI_APEI_SEA FIX_APEI_GHES_SEA, #endif +#ifdef CONFIG_ARM_SDE_INTERFACE + FIX_APEI_GHES_SDEI_NORMAL, + FIX_APEI_GHES_SDEI_CRITICAL, +#endif #endif /* CONFIG_ACPI_APEI_GHES */ #ifdef CONFIG_UNMAP_KERNEL_AT_EL0 diff --git a/drivers/firmware/arm_sdei.c b/drivers/firmware/arm_sdei.c index 1ea71640fdc2..2c29f435b1f9 100644 --- a/drivers/firmware/arm_sdei.c +++ b/drivers/firmware/arm_sdei.c @@ -2,6 +2,7 @@ // Copyright (C) 2017 Arm Ltd. #define pr_fmt(fmt) "sdei: " fmt +#include #include #include #include @@ -32,6 +33,8 @@ #include #include +#include + /* * The call to use to reach the firmware. */ @@ -887,6 +890,80 @@ static void sdei_smccc_hvc(unsigned long function_id, arm_smccc_hvc(function_id, arg0, arg1, arg2, arg3, arg4, 0, 0, res); } +#ifdef CONFIG_ACPI_APEI_GHES +/* These stop private notifications using the fixmap entries simultaneously */ +static DEFINE_RAW_SPINLOCK(sdei_ghes_fixmap_lock_normal); +static DEFINE_RAW_SPINLOCK(sdei_ghes_fixmap_lock_critical); + +int sdei_register_ghes(struct ghes *ghes, sdei_event_callback *cb) +{ + int err; + u32 event_num; + u64 result; + + if (acpi_disabled) + return -EOPNOTSUPP; + + event_num = ghes->generic->notify.vector; + if (event_num == 0) { + /* + * Event 0 is reserved by the specification for + * SDEI_EVENT_SIGNAL. + */ + return -EINVAL; + } + + err = sdei_api_event_get_info(event_num, SDEI_EVENT_INFO_EV_PRIORITY, + &result); + if (err) + return err; + + if (result == SDEI_EVENT_PRIORITY_CRITICAL) { + ghes->nmi_fixmap_lock = &sdei_ghes_fixmap_lock_critical; + ghes->nmi_fixmap_idx = FIX_APEI_GHES_SDEI_CRITICAL; + } else { + ghes->nmi_fixmap_lock = &sdei_ghes_fixmap_lock_normal; + ghes->nmi_fixmap_idx = FIX_APEI_GHES_SDEI_NORMAL; + } + + err = sdei_event_register(event_num, cb, ghes); + if (!err) + err = sdei_event_enable(event_num); + + return err; +} + +int sdei_unregister_ghes(struct ghes *ghes) +{ + int i; + int err; + u32 event_num = ghes->generic->notify.vector; + + might_sleep(); + + if (acpi_disabled) + return -EOPNOTSUPP; + + /* + * The event may be running on another CPU. Disable it + * to stop new events, then try to unregister a few times. + */ + err = sdei_event_disable(event_num); + if (err) + return err; + + for (i = 0; i < 3; i++) { + err = sdei_event_unregister(event_num); + if (err != -EINPROGRESS) + break; + + schedule(); + } + + return err; +} +#endif /* CONFIG_ACPI_APEI_GHES */ + static int sdei_get_conduit(struct platform_device *pdev) { const char *method; diff --git a/include/linux/arm_sdei.h b/include/linux/arm_sdei.h index 942afbd544b7..5fdf799be026 100644 --- a/include/linux/arm_sdei.h +++ b/include/linux/arm_sdei.h @@ -11,6 +11,7 @@ enum sdei_conduit_types { CONDUIT_HVC, }; +#include #include /* Arch code should override this to set the entry point from firmware... */ @@ -39,6 +40,10 @@ int sdei_event_unregister(u32 event_num); int sdei_event_enable(u32 event_num); int sdei_event_disable(u32 event_num); +/* GHES register/unregister helpers */ +int sdei_register_ghes(struct ghes *ghes, sdei_event_callback *cb); +int sdei_unregister_ghes(struct ghes *ghes); + #ifdef CONFIG_ARM_SDE_INTERFACE /* For use by arch code when CPU hotplug notifiers are not appropriate. */ int sdei_mask_local_cpu(void); -- 2.16.2