From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id B99BC256A for ; Mon, 13 Feb 2023 10:18:18 +0000 (UTC) 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 2B01D1D31; Mon, 13 Feb 2023 02:19:01 -0800 (PST) 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 90EBB3F703; Mon, 13 Feb 2023 02:18:17 -0800 (PST) From: Nikos Nikoleris To: kvm@vger.kernel.org, kvmarm@lists.linux.dev, andrew.jones@linux.dev Cc: pbonzini@redhat.com, alexandru.elisei@arm.com, ricarkol@google.com, Andrew Jones Subject: [PATCH v4 12/30] arm64: Add support for setting up the PSCI conduit through ACPI Date: Mon, 13 Feb 2023 10:17:41 +0000 Message-Id: <20230213101759.2577077-13-nikos.nikoleris@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230213101759.2577077-1-nikos.nikoleris@arm.com> References: <20230213101759.2577077-1-nikos.nikoleris@arm.com> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ARM-No-Footer: FoSSMail Content-Transfer-Encoding: 8bit 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.arm64 | 4 ++++ lib/acpi.h | 5 +++++ lib/arm/psci.c | 37 ++++++++++++++++++++++++++++++++++++- 3 files changed, 45 insertions(+), 1 deletion(-) diff --git a/arm/Makefile.arm64 b/arm/Makefile.arm64 index 42e18e77..6dff6cad 100644 --- a/arm/Makefile.arm64 +++ b/arm/Makefile.arm64 @@ -25,6 +25,10 @@ cflatobjs += lib/arm64/processor.o cflatobjs += lib/arm64/spinlock.o cflatobjs += lib/arm64/gic-v3-its.o lib/arm64/gic-v3-its-cmd.o +ifeq ($(CONFIG_EFI),y) +cflatobjs += lib/acpi.o +endif + OBJDIRS += lib/arm64 # arm64 specific tests diff --git a/lib/acpi.h b/lib/acpi.h index 38b6d5c9..5ba6e29d 100644 --- a/lib/acpi.h +++ b/lib/acpi.h @@ -129,6 +129,11 @@ 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 acpi_table_facs_rev1 { u32 signature; /* ACPI Signature */ u32 length; /* Length of structure, in bytes */ diff --git a/lib/arm/psci.c b/lib/arm/psci.c index 9c031a12..bddb0787 100644 --- a/lib/arm/psci.c +++ b/lib/arm/psci.c @@ -56,7 +56,7 @@ 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 +75,38 @@ void psci_set_conduit(void) else assert_msg(false, "Unknown PSCI conduit: %s", method->data); } + +#ifdef CONFIG_EFI + +#include + +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; +} + +#else + +static void psci_set_conduit_acpi(void) +{ + assert_msg(false, "ACPI not available"); +} + +#endif + +void psci_set_conduit(void) +{ + if (dt_available()) + psci_set_conduit_fdt(); + else + psci_set_conduit_acpi(); +} -- 2.25.1