From patchwork Fri May 6 20:55:47 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nikos Nikoleris X-Patchwork-Id: 12841598 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 4D20EC433FE for ; Fri, 6 May 2022 20:57:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1444208AbiEFVAo (ORCPT ); Fri, 6 May 2022 17:00:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52826 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1444177AbiEFVAm (ORCPT ); Fri, 6 May 2022 17:00:42 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 6C47C5C655 for ; Fri, 6 May 2022 13:56:58 -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 46C0314BF; Fri, 6 May 2022 13:56:58 -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 70FA53F800; Fri, 6 May 2022 13:56:57 -0700 (PDT) From: Nikos Nikoleris To: kvm@vger.kernel.org Cc: drjones@redhat.com, pbonzini@redhat.com, jade.alglave@arm.com, alexandru.elisei@arm.com Subject: [kvm-unit-tests PATCH v2 05/23] arm/arm64: Add support for setting up the PSCI conduit through ACPI Date: Fri, 6 May 2022 21:55:47 +0100 Message-Id: <20220506205605.359830-6-nikos.nikoleris@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220506205605.359830-1-nikos.nikoleris@arm.com> References: <20220506205605.359830-1-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 | 23 ++++++++++++++++++++++- lib/devicetree.c | 2 +- 4 files changed, 29 insertions(+), 2 deletions(-) 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 9f27eb1..139ccba 100644 --- a/lib/acpi.h +++ b/lib/acpi.h @@ -130,6 +130,11 @@ struct acpi_table_fadt u64 hypervisor_id; /* Hypervisor Vendor ID (ACPI 6.0) */ } __attribute__ ((packed)); +/* 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..0e96d19 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 +76,23 @@ 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 platfrom"); + 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(); +} diff --git a/lib/devicetree.c b/lib/devicetree.c index 78c1f6f..3ff9d16 100644 --- a/lib/devicetree.c +++ b/lib/devicetree.c @@ -16,7 +16,7 @@ const void *dt_fdt(void) bool dt_available(void) { - return fdt_check_header(fdt) == 0; + return fdt && fdt_check_header(fdt) == 0; } int dt_get_nr_cells(int fdtnode, u32 *nr_address_cells, u32 *nr_size_cells)