From patchwork Thu Jun 30 10:03:04 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nikos Nikoleris X-Patchwork-Id: 12901541 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 D9F21C433EF for ; Thu, 30 Jun 2022 10:04:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234719AbiF3KEC (ORCPT ); Thu, 30 Jun 2022 06:04:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38658 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234711AbiF3KEA (ORCPT ); Thu, 30 Jun 2022 06:04:00 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 1CD6D43ADF for ; Thu, 30 Jun 2022 03:03:58 -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 40D2A1063; Thu, 30 Jun 2022 03:03:58 -0700 (PDT) Received: from godel.lab.cambridge.arm.com (godel.lab.cambridge.arm.com [10.7.66.42]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 1211C3F5A1; Thu, 30 Jun 2022 03:03:56 -0700 (PDT) From: Nikos Nikoleris To: kvm@vger.kernel.org Cc: andrew.jones@linux.dev, drjones@redhat.com, pbonzini@redhat.com, jade.alglave@arm.com, alexandru.elisei@arm.com, ricarkol@google.com Subject: [kvm-unit-tests PATCH v3 07/27] arm/arm64: Add support for setting up the PSCI conduit through ACPI Date: Thu, 30 Jun 2022 11:03:04 +0100 Message-Id: <20220630100324.3153655-8-nikos.nikoleris@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220630100324.3153655-1-nikos.nikoleris@arm.com> References: <20220630100324.3153655-1-nikos.nikoleris@arm.com> MIME-Version: 1.0 X-ARM-No-Footer: FoSSMail Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org In systems with ACPI support and when a DT is not provided, we can use the FADT to discover whether PSCI calls need to use smc or hvc calls. This change implements this but retains the default behavior; we check if a valid DT is provided, if not, we try to setup the PSCI conduit using ACPI. Signed-off-by: Nikos Nikoleris Reviewed-by: Andrew Jones Reviewed-by: Ricardo Koller --- arm/Makefile.common | 1 + lib/acpi.h | 5 +++++ lib/arm/psci.c | 25 ++++++++++++++++++++++++- 3 files changed, 30 insertions(+), 1 deletion(-) diff --git a/arm/Makefile.common b/arm/Makefile.common index 38385e0..8e9b3bb 100644 --- a/arm/Makefile.common +++ b/arm/Makefile.common @@ -38,6 +38,7 @@ cflatobjs += lib/alloc_page.o cflatobjs += lib/vmalloc.o cflatobjs += lib/alloc.o cflatobjs += lib/devicetree.o +cflatobjs += lib/acpi.o cflatobjs += lib/pci.o cflatobjs += lib/pci-host-generic.o cflatobjs += lib/pci-testdev.o diff --git a/lib/acpi.h b/lib/acpi.h index e49647b..6c18f73 100644 --- a/lib/acpi.h +++ b/lib/acpi.h @@ -131,6 +131,11 @@ struct acpi_table_fadt u64 hypervisor_id; /* Hypervisor Vendor ID (ACPI 6.0) */ }; +/* Masks for FADT ARM Boot Architecture Flags (arm_boot_flags) ACPI 5.1 */ + +#define ACPI_FADT_PSCI_COMPLIANT (1) /* 00: [V5+] PSCI 0.2+ is implemented */ +#define ACPI_FADT_PSCI_USE_HVC (1<<1) /* 01: [V5+] HVC must be used instead of SMC as the PSCI conduit */ + struct facs_descriptor_rev1 { u32 signature; /* ACPI Signature */ diff --git a/lib/arm/psci.c b/lib/arm/psci.c index 9c031a1..afbc33d 100644 --- a/lib/arm/psci.c +++ b/lib/arm/psci.c @@ -6,6 +6,7 @@ * * This work is licensed under the terms of the GNU LGPL, version 2. */ +#include #include #include #include @@ -56,7 +57,7 @@ void psci_system_off(void) printf("CPU%d unable to do system off (error = %d)\n", smp_processor_id(), err); } -void psci_set_conduit(void) +static void psci_set_conduit_fdt(void) { const void *fdt = dt_fdt(); const struct fdt_property *method; @@ -75,3 +76,25 @@ void psci_set_conduit(void) else assert_msg(false, "Unknown PSCI conduit: %s", method->data); } + +static void psci_set_conduit_acpi(void) +{ + struct acpi_table_fadt *fadt = find_acpi_table_addr(FACP_SIGNATURE); + + assert_msg(fadt, "Unable to find ACPI FADT"); + assert_msg(fadt->arm_boot_flags & ACPI_FADT_PSCI_COMPLIANT, + "PSCI is not supported in this platform"); + + if (fadt->arm_boot_flags & ACPI_FADT_PSCI_USE_HVC) + psci_invoke = psci_invoke_hvc; + else + psci_invoke = psci_invoke_smc; +} + +void psci_set_conduit(void) +{ + if (dt_available()) + psci_set_conduit_fdt(); + else + psci_set_conduit_acpi(); +}