From patchwork Mon Feb 13 10:17:44 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nikos Nikoleris X-Patchwork-Id: 13138171 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 BC080C636D4 for ; Mon, 13 Feb 2023 10:18:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230423AbjBMKSe (ORCPT ); Mon, 13 Feb 2023 05:18:34 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53992 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230350AbjBMKSb (ORCPT ); Mon, 13 Feb 2023 05:18:31 -0500 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 5DE03269D for ; Mon, 13 Feb 2023 02:18:22 -0800 (PST) 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 BD8C31D70; Mon, 13 Feb 2023 02:19:04 -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 2F4043F703; Mon, 13 Feb 2023 02:18:21 -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 15/30] arm64: Add support for cpu initialization through ACPI Date: Mon, 13 Feb 2023 10:17:44 +0000 Message-Id: <20230213101759.2577077-16-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> 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 MADTs to discover the number of CPUs and their corresponding MIDR. This change implements this but retains the default behavior; we check if a valid DT is provided, if not, we try to discover the cores in the system using ACPI. Signed-off-by: Nikos Nikoleris Reviewed-by: Andrew Jones --- lib/acpi.c | 20 ++++++++++++++++ lib/acpi.h | 63 +++++++++++++++++++++++++++++++++++++++++++++++++ lib/arm/setup.c | 42 ++++++++++++++++++++++++++++++--- 3 files changed, 122 insertions(+), 3 deletions(-) diff --git a/lib/acpi.c b/lib/acpi.c index a197f3dd..bbe33d08 100644 --- a/lib/acpi.c +++ b/lib/acpi.c @@ -102,3 +102,23 @@ void *find_acpi_table_addr(u32 sig) return NULL; } + +void acpi_table_parse_madt(enum acpi_madt_type mtype, acpi_table_handler handler) +{ + struct acpi_table_madt *madt; + struct acpi_subtable_header *header; + void *end; + + madt = find_acpi_table_addr(MADT_SIGNATURE); + assert(madt); + + header = (void *)(ulong) madt + sizeof(struct acpi_table_madt); + end = (void *)((ulong) madt + madt->length); + + while ((void *)header < end) { + if (header->type == mtype) + handler(header); + + header = (void *)(ulong) header + header->length; + } +} diff --git a/lib/acpi.h b/lib/acpi.h index 9d974ee2..af02fd83 100644 --- a/lib/acpi.h +++ b/lib/acpi.h @@ -17,6 +17,7 @@ #define XSDT_SIGNATURE ACPI_SIGNATURE('X','S','D','T') #define FACP_SIGNATURE ACPI_SIGNATURE('F','A','C','P') #define FACS_SIGNATURE ACPI_SIGNATURE('F','A','C','S') +#define MADT_SIGNATURE ACPI_SIGNATURE('A','P','I','C') #define SPCR_SIGNATURE ACPI_SIGNATURE('S','P','C','R') #define GTDT_SIGNATURE ACPI_SIGNATURE('G','T','D','T') @@ -147,6 +148,67 @@ struct acpi_table_facs_rev1 { u8 reserved3[40]; /* Reserved - must be zero */ }; +struct acpi_table_madt { + ACPI_TABLE_HEADER_DEF /* ACPI common table header */ + u32 address; /* Physical address of local APIC */ + u32 flags; +}; + +struct acpi_subtable_header { + u8 type; + u8 length; +}; + +typedef int (*acpi_table_handler)(struct acpi_subtable_header *header); + +/* 11: Generic interrupt - GICC (ACPI 5.0 + ACPI 6.0 + ACPI 6.3 changes) */ + +struct acpi_madt_generic_interrupt { + u8 type; + u8 length; + u16 reserved; /* reserved - must be zero */ + u32 cpu_interface_number; + u32 uid; + u32 flags; + u32 parking_version; + u32 performance_interrupt; + u64 parked_address; + u64 base_address; + u64 gicv_base_address; + u64 gich_base_address; + u32 vgic_interrupt; + u64 gicr_base_address; + u64 arm_mpidr; + u8 efficiency_class; + u8 reserved2[1]; + u16 spe_interrupt; /* ACPI 6.3 */ +}; + +/* Values for MADT subtable type in struct acpi_subtable_header */ + +enum acpi_madt_type { + ACPI_MADT_TYPE_LOCAL_APIC = 0, + ACPI_MADT_TYPE_IO_APIC = 1, + ACPI_MADT_TYPE_INTERRUPT_OVERRIDE = 2, + ACPI_MADT_TYPE_NMI_SOURCE = 3, + ACPI_MADT_TYPE_LOCAL_APIC_NMI = 4, + ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE = 5, + ACPI_MADT_TYPE_IO_SAPIC = 6, + ACPI_MADT_TYPE_LOCAL_SAPIC = 7, + ACPI_MADT_TYPE_INTERRUPT_SOURCE = 8, + ACPI_MADT_TYPE_LOCAL_X2APIC = 9, + ACPI_MADT_TYPE_LOCAL_X2APIC_NMI = 10, + ACPI_MADT_TYPE_GENERIC_INTERRUPT = 11, + ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR = 12, + ACPI_MADT_TYPE_GENERIC_MSI_FRAME = 13, + ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR = 14, + ACPI_MADT_TYPE_GENERIC_TRANSLATOR = 15, + ACPI_MADT_TYPE_RESERVED = 16 /* 16 and greater are reserved */ +}; + +/* MADT Local APIC flags */ +#define ACPI_MADT_ENABLED (1) /* 00: Processor is usable if set */ + struct spcr_descriptor { ACPI_TABLE_HEADER_DEF /* ACPI common table header */ u8 interface_type; /* 0=full 16550, 1=subset of 16550 */ @@ -192,5 +254,6 @@ struct acpi_table_gtdt { void set_efi_rsdp(struct acpi_table_rsdp *rsdp); void *find_acpi_table_addr(u32 sig); +void acpi_table_parse_madt(enum acpi_madt_type mtype, acpi_table_handler handler); #endif diff --git a/lib/arm/setup.c b/lib/arm/setup.c index 1572c64e..59b0aedd 100644 --- a/lib/arm/setup.c +++ b/lib/arm/setup.c @@ -55,7 +55,7 @@ int mpidr_to_cpu(uint64_t mpidr) return -1; } -static void cpu_set(int fdtnode __unused, u64 regval, void *info __unused) +static void cpu_set_fdt(int fdtnode __unused, u64 regval, void *info __unused) { int cpu = nr_cpus++; @@ -65,13 +65,49 @@ static void cpu_set(int fdtnode __unused, u64 regval, void *info __unused) set_cpu_present(cpu, true); } +#ifdef CONFIG_EFI + +#include + +static int cpu_set_acpi(struct acpi_subtable_header *header) +{ + int cpu = nr_cpus++; + struct acpi_madt_generic_interrupt *gicc = (void *)header; + + assert_msg(cpu < NR_CPUS, "Number cpus exceeds maximum supported (%d).", NR_CPUS); + + cpus[cpu] = gicc->arm_mpidr; + set_cpu_present(cpu, true); + + return 0; +} + +static void cpu_init_acpi(void) +{ + acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT, cpu_set_acpi); +} + +#else + +static void cpu_init_acpi(void) +{ + assert_msg(false, "ACPI not available"); +} + +#endif + static void cpu_init(void) { int ret; nr_cpus = 0; - ret = dt_for_each_cpu_node(cpu_set, NULL); - assert(ret == 0); + if (dt_available()) { + ret = dt_for_each_cpu_node(cpu_set_fdt, NULL); + assert(ret == 0); + } else { + cpu_init_acpi(); + } + set_cpu_online(0, true); }