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Wysocki" , Len Brown , Alex Chiang , Venkatesh Pallipadi , linux-acpi@vger.kernel.org Subject: [PATCH 1/3] acpi/processor: fix evaluating _PDC method when running as Xen dom0 Date: Mon, 21 Nov 2022 11:21:10 +0100 Message-Id: <20221121102113.41893-2-roger.pau@citrix.com> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221121102113.41893-1-roger.pau@citrix.com> References: <20221121102113.41893-1-roger.pau@citrix.com> X-ClientProxiedBy: LO6P123CA0041.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:2fe::12) To SJ0PR03MB6360.namprd03.prod.outlook.com (2603:10b6:a03:395::11) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ0PR03MB6360:EE_|BL1PR03MB6102:EE_ X-MS-Office365-Filtering-Correlation-Id: fe416c5d-484e-4b08-2ed8-08dacbabcef7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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number of CPUs available to Linux can be different from the number of CPUs present on the system, but in order to properly fetch processor performance related data _PDC must be executed on all the physical CPUs online on the system. The current checks in processor_physically_present() result in some processor objects not getting their _PDC methods evaluated when Linux is running as Xen dom0. Fix this by introducing a custom function to use when running as Xen dom0 in order to check whether a processor object matches a CPU that's online. Fixes: 5d554a7bb064 ('ACPI: processor: add internal processor_physically_present()') Signed-off-by: Roger Pau Monné --- arch/x86/include/asm/xen/hypervisor.h | 10 ++++++++++ arch/x86/xen/enlighten.c | 27 +++++++++++++++++++++++++++ drivers/acpi/processor_pdc.c | 11 +++++++++++ 3 files changed, 48 insertions(+) diff --git a/arch/x86/include/asm/xen/hypervisor.h b/arch/x86/include/asm/xen/hypervisor.h index 16f548a661cf..b9f512138043 100644 --- a/arch/x86/include/asm/xen/hypervisor.h +++ b/arch/x86/include/asm/xen/hypervisor.h @@ -61,4 +61,14 @@ void __init xen_pvh_init(struct boot_params *boot_params); void __init mem_map_via_hcall(struct boot_params *boot_params_p); #endif +#ifdef CONFIG_XEN_DOM0 +bool __init xen_processor_present(uint32_t acpi_id); +#else +static inline bool xen_processor_present(uint32_t acpi_id) +{ + BUG(); + return false; +} +#endif + #endif /* _ASM_X86_XEN_HYPERVISOR_H */ diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index b8db2148c07d..d4c44361a26c 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -346,3 +346,30 @@ void xen_arch_unregister_cpu(int num) } EXPORT_SYMBOL(xen_arch_unregister_cpu); #endif + +#ifdef CONFIG_XEN_DOM0 +bool __init xen_processor_present(uint32_t acpi_id) +{ + unsigned int i, maxid; + struct xen_platform_op op = { + .cmd = XENPF_get_cpuinfo, + .interface_version = XENPF_INTERFACE_VERSION, + }; + int ret = HYPERVISOR_platform_op(&op); + + if (ret) + return false; + + maxid = op.u.pcpu_info.max_present; + for (i = 0; i <= maxid; i++) { + op.u.pcpu_info.xen_cpuid = i; + ret = HYPERVISOR_platform_op(&op); + if (ret) + continue; + if (op.u.pcpu_info.acpi_id == acpi_id) + return op.u.pcpu_info.flags & XEN_PCPU_FLAGS_ONLINE; + } + + return false; +} +#endif diff --git a/drivers/acpi/processor_pdc.c b/drivers/acpi/processor_pdc.c index 8c3f82c9fff3..18fb04523f93 100644 --- a/drivers/acpi/processor_pdc.c +++ b/drivers/acpi/processor_pdc.c @@ -14,6 +14,8 @@ #include #include +#include + #include "internal.h" static bool __init processor_physically_present(acpi_handle handle) @@ -47,6 +49,15 @@ static bool __init processor_physically_present(acpi_handle handle) return false; } + if (xen_initial_domain()) + /* + * When running as a Xen dom0 the number of processors Linux + * sees can be different from the real number of processors on + * the system, and we still need to execute _PDC for all of + * them. + */ + return xen_processor_present(acpi_id); + type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0; cpuid = acpi_get_cpuid(handle, type, acpi_id); From patchwork Mon Nov 21 10:21:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Roger_Pau_Monn=C3=A9?= X-Patchwork-Id: 627289 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 22F34C4332F for ; Mon, 21 Nov 2022 10:34:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230000AbiKUKer (ORCPT ); Mon, 21 Nov 2022 05:34:47 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41070 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229910AbiKUKec (ORCPT ); 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notify ACPI of the OS capabilities, and so ACPI can adjust the return of other Processor methods taking the OS capabilities into account. When Linux is running as a Xen dom0, it's the hypervisor the entity in charge of processor power management, and hence Xen needs to make sure the capabilities reported in the _PDC buffer match the capabilities of the driver in Xen. Introduce a small helper to sanitize the buffer when running as Xen dom0. Signed-off-by: Roger Pau Monné Cc: stable@vger.kernel.org --- arch/x86/include/asm/xen/hypervisor.h | 2 ++ arch/x86/xen/enlighten.c | 17 +++++++++++++++++ drivers/acpi/processor_pdc.c | 8 ++++++++ 3 files changed, 27 insertions(+) diff --git a/arch/x86/include/asm/xen/hypervisor.h b/arch/x86/include/asm/xen/hypervisor.h index b9f512138043..b4ed90ef5e68 100644 --- a/arch/x86/include/asm/xen/hypervisor.h +++ b/arch/x86/include/asm/xen/hypervisor.h @@ -63,12 +63,14 @@ void __init mem_map_via_hcall(struct boot_params *boot_params_p); #ifdef CONFIG_XEN_DOM0 bool __init xen_processor_present(uint32_t acpi_id); +void xen_sanitize_pdc(uint32_t *buf); #else static inline bool xen_processor_present(uint32_t acpi_id) { BUG(); return false; } +static inline void xen_sanitize_pdc(uint32_t *buf) { BUG(); } #endif #endif /* _ASM_X86_XEN_HYPERVISOR_H */ diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index d4c44361a26c..394dd6675113 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -372,4 +372,21 @@ bool __init xen_processor_present(uint32_t acpi_id) return false; } + +void xen_sanitize_pdc(uint32_t *buf) +{ + struct xen_platform_op op = { + .cmd = XENPF_set_processor_pminfo, + .interface_version = XENPF_INTERFACE_VERSION, + .u.set_pminfo.id = -1, + .u.set_pminfo.type = XEN_PM_PDC, + }; + int ret; + + set_xen_guest_handle(op.u.set_pminfo.pdc, buf); + ret = HYPERVISOR_platform_op(&op); + if (ret) + pr_info("sanitize of _PDC buffer bits from Xen failed: %d\n", + ret); +} #endif diff --git a/drivers/acpi/processor_pdc.c b/drivers/acpi/processor_pdc.c index 18fb04523f93..58f4c208517a 100644 --- a/drivers/acpi/processor_pdc.c +++ b/drivers/acpi/processor_pdc.c @@ -137,6 +137,14 @@ acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in) buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH); } + if (xen_initial_domain()) + /* + * When Linux is running as Xen dom0 it's the hypervisor the + * entity in charge of the processor power management, and so + * Xen needs to check the OS capabilities reported in the _PDC + * buffer matches what the hypervisor driver supports. + */ + xen_sanitize_pdc((uint32_t *)pdc_in->pointer->buffer.pointer); status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL); if (ACPI_FAILURE(status))