From: Nikos Nikoleris <nikos.nikoleris@arm.com>
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 <drjones@redhat.com>
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 [thread overview]
Message-ID: <20230213101759.2577077-13-nikos.nikoleris@arm.com> (raw)
In-Reply-To: <20230213101759.2577077-1-nikos.nikoleris@arm.com>
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 <nikos.nikoleris@arm.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Ricardo Koller <ricarkol@google.com>
---
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 <acpi.h>
+
+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
next prev parent reply other threads:[~2023-02-13 10:18 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-13 10:17 [PATCH v4 00/30] EFI and ACPI support for arm64 Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 01/30] lib: Move acpi header and implementation to lib Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 02/30] x86: Move x86_64-specific EFI CFLAGS to x86_64 Makefile Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 03/30] arm/Makefile.common: Compile lib/acpi.c if CONFIG_EFI=y Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 04/30] lib: Apply Lindent to acpi.{c,h} Nikos Nikoleris
2023-03-09 7:11 ` Shaoqin Huang
2023-03-21 17:32 ` Andrew Jones
2023-03-22 10:05 ` Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 05/30] lib: Fix style for acpi.{c,h} Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 06/30] lib/acpi: Convert table names to Linux style Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 07/30] x86: Avoid references to fields of ACPI tables Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 08/30] lib/acpi: Ensure all struct definition for ACPI tables are packed Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 09/30] lib/acpi: Add support for the XSDT table Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 10/30] lib/acpi: Extend the definition of the FADT table Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 11/30] devicetree: Check that fdt is not NULL in dt_available() Nikos Nikoleris
2023-02-13 10:17 ` Nikos Nikoleris [this message]
2023-03-21 17:31 ` [PATCH v4 12/30] arm64: Add support for setting up the PSCI conduit through ACPI Andrew Jones
2023-02-13 10:17 ` [PATCH v4 13/30] arm64: Add support for discovering the UART " Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 14/30] arm64: Add support for timer initialization " Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 15/30] arm64: Add support for cpu " Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 16/30] arm64: Add support for gic " Nikos Nikoleris
2023-03-30 6:46 ` Shaoqin Huang
2023-02-13 10:17 ` [PATCH v4 17/30] lib/printf: Support for precision modifier in printf Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 18/30] lib/printf: Add support for printing wide strings Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 19/30] lib/efi: Add support for getting the cmdline Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 20/30] arm/arm64: Rename etext to _etext Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 21/30] lib: Avoid ms_abi for calls related to EFI on arm64 Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 22/30] arm64: Add a new type of memory type flag MR_F_RESERVED Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 23/30] arm64: Add a setup sequence for systems that boot through EFI Nikos Nikoleris
2023-04-25 7:04 ` Shaoqin Huang
2023-04-25 9:09 ` Nikos Nikoleris
2023-04-25 18:31 ` Andrew Jones
2023-02-13 10:17 ` [PATCH v4 24/30] arm64: Copy code from GNU-EFI Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 25/30] arm64: Change GNU-EFI imported code to use defined types Nikos Nikoleris
2023-03-30 6:49 ` Shaoqin Huang
2023-02-13 10:17 ` [PATCH v4 26/30] arm64: Use code from the gnu-efi when booting with EFI Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 27/30] lib: Avoid external dependency in libelf Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 28/30] arm64: Add support for efi in Makefile Nikos Nikoleris
2023-03-21 18:21 ` Andrew Jones
2023-02-13 10:17 ` [PATCH v4 29/30] lib: arm: Print test exit status Nikos Nikoleris
2023-02-13 10:17 ` [PATCH v4 30/30] arm64: Add an efi/run script Nikos Nikoleris
2023-03-21 18:41 ` Andrew Jones
2023-03-22 10:02 ` Nikos Nikoleris
2023-03-22 11:24 ` Andrew Jones
2023-03-22 11:57 ` Nikos Nikoleris
2023-03-22 12:32 ` Andrew Jones
2023-03-22 19:09 ` Nikos Nikoleris
2023-03-23 17:52 ` Andrew Jones
2023-03-28 9:03 ` Alexandru Elisei
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