From patchwork Mon Feb 13 10:17:45 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nikos Nikoleris X-Patchwork-Id: 13138172 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 EDF5DC636CC for ; Mon, 13 Feb 2023 10:18:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230271AbjBMKSf (ORCPT ); Mon, 13 Feb 2023 05:18:35 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54048 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230361AbjBMKSd (ORCPT ); Mon, 13 Feb 2023 05:18:33 -0500 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id BA70F166F1 for ; Mon, 13 Feb 2023 02:18:23 -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 D41481DB5; Mon, 13 Feb 2023 02:19:05 -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 606343F703; Mon, 13 Feb 2023 02:18:22 -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 Subject: [PATCH v4 16/30] arm64: Add support for gic initialization through ACPI Date: Mon, 13 Feb 2023 10:17:45 +0000 Message-Id: <20230213101759.2577077-17-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 figure out if it implements a GICv2 or a GICv3 and discover the GIC parameters. 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 --- lib/acpi.c | 9 +++- lib/acpi.h | 46 +++++++++++++++- lib/arm/gic.c | 139 ++++++++++++++++++++++++++++++++++++++++++++++++- lib/libcflat.h | 1 + 4 files changed, 191 insertions(+), 4 deletions(-) diff --git a/lib/acpi.c b/lib/acpi.c index bbe33d08..760cd8b2 100644 --- a/lib/acpi.c +++ b/lib/acpi.c @@ -103,11 +103,12 @@ void *find_acpi_table_addr(u32 sig) return NULL; } -void acpi_table_parse_madt(enum acpi_madt_type mtype, acpi_table_handler handler) +int 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; + int count = 0; madt = find_acpi_table_addr(MADT_SIGNATURE); assert(madt); @@ -116,9 +117,13 @@ void acpi_table_parse_madt(enum acpi_madt_type mtype, acpi_table_handler handler end = (void *)((ulong) madt + madt->length); while ((void *)header < end) { - if (header->type == mtype) + if (header->type == mtype) { handler(header); + count++; + } header = (void *)(ulong) header + header->length; } + + return count; } diff --git a/lib/acpi.h b/lib/acpi.h index af02fd83..a2c0f982 100644 --- a/lib/acpi.h +++ b/lib/acpi.h @@ -184,6 +184,50 @@ struct acpi_madt_generic_interrupt { u16 spe_interrupt; /* ACPI 6.3 */ }; +#define ACPI_MADT_ENABLED (1) /* 00: Processor is usable if set */ + +/* 12: Generic Distributor (ACPI 5.0 + ACPI 6.0 changes) */ + +struct acpi_madt_generic_distributor { + struct acpi_subtable_header header; + u16 reserved; /* reserved - must be zero */ + u32 gic_id; + u64 base_address; + u32 global_irq_base; + u8 version; + u8 reserved2[3]; /* reserved - must be zero */ +}; + +/* Values for Version field above */ + +enum acpi_madt_gic_version { + ACPI_MADT_GIC_VERSION_NONE = 0, + ACPI_MADT_GIC_VERSION_V1 = 1, + ACPI_MADT_GIC_VERSION_V2 = 2, + ACPI_MADT_GIC_VERSION_V3 = 3, + ACPI_MADT_GIC_VERSION_V4 = 4, + ACPI_MADT_GIC_VERSION_RESERVED = 5 /* 5 and greater are reserved */ +}; + +/* 14: Generic Redistributor (ACPI 5.1) */ + +struct acpi_madt_generic_redistributor { + struct acpi_subtable_header header; + u16 reserved; /* reserved - must be zero */ + u64 base_address; + u32 length; +}; + +/* 15: Generic Translator (ACPI 6.0) */ + +struct acpi_madt_generic_translator { + struct acpi_subtable_header header; + u16 reserved; /* reserved - must be zero */ + u32 translation_id; + u64 base_address; + u32 reserved2; +}; + /* Values for MADT subtable type in struct acpi_subtable_header */ enum acpi_madt_type { @@ -254,6 +298,6 @@ 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); +int acpi_table_parse_madt(enum acpi_madt_type mtype, acpi_table_handler handler); #endif diff --git a/lib/arm/gic.c b/lib/arm/gic.c index 1bfcfcfb..8fc5596f 100644 --- a/lib/arm/gic.c +++ b/lib/arm/gic.c @@ -3,6 +3,7 @@ * * This work is licensed under the terms of the GNU LGPL, version 2. */ +#include #include #include #include @@ -120,7 +121,7 @@ int gic_version(void) return 0; } -int gic_init(void) +static int gic_init_fdt(void) { if (gicv2_init()) { gic_common_ops = &gicv2_common_ops; @@ -133,6 +134,142 @@ int gic_init(void) return gic_version(); } +#ifdef CONFIG_EFI + +#define ACPI_GICV2_DIST_MEM_SIZE (SZ_4K) +#define ACPI_GIC_CPU_IF_MEM_SIZE (SZ_8K) +#define ACPI_GICV3_DIST_MEM_SIZE (SZ_64K) +#define ACPI_GICV3_ITS_MEM_SIZE (SZ_128K) + +static int gic_acpi_version(struct acpi_subtable_header *header) +{ + struct acpi_madt_generic_distributor *dist = (void *)header; + int version = dist->version; + + if (version == 2) + gic_common_ops = &gicv2_common_ops; + else if (version == 3) + gic_common_ops = &gicv3_common_ops; + + return version; +} + +static int gicv2_acpi_parse_madt_cpu(struct acpi_subtable_header *header) +{ + struct acpi_madt_generic_interrupt *gicc = (void *)header; + static phys_addr_t gicc_base_address; + + if (!(gicc->flags & ACPI_MADT_ENABLED)) + return 0; + + if (!gicc_base_address) { + gicc_base_address = gicc->base_address; + gicv2_data.cpu_base = ioremap(gicc_base_address, ACPI_GIC_CPU_IF_MEM_SIZE); + } + assert(gicc_base_address == gicc->base_address); + + return 0; +} + +static int gicv2_acpi_parse_madt_dist(struct acpi_subtable_header *header) +{ + struct acpi_madt_generic_distributor *dist = (void *)header; + + gicv2_data.dist_base = ioremap(dist->base_address, ACPI_GICV2_DIST_MEM_SIZE); + + return 0; +} + +static int gicv3_acpi_parse_madt_gicc(struct acpi_subtable_header *header) +{ + struct acpi_madt_generic_interrupt *gicc = (void *)header; + static phys_addr_t gicr_base_address; + + if (!(gicc->flags & ACPI_MADT_ENABLED)) + return 0; + + if (!gicr_base_address) { + gicr_base_address = gicc->gicr_base_address; + gicv3_data.redist_bases[0] = ioremap(gicr_base_address, SZ_64K * 2); + } + assert(gicr_base_address == gicc->gicr_base_address); + + return 0; +} + +static int gicv3_acpi_parse_madt_dist(struct acpi_subtable_header *header) +{ + struct acpi_madt_generic_distributor *dist = (void *)header; + + gicv3_data.dist_base = ioremap(dist->base_address, ACPI_GICV3_DIST_MEM_SIZE); + + return 0; +} + +static int gicv3_acpi_parse_madt_redist(struct acpi_subtable_header *header) +{ + static int i; + struct acpi_madt_generic_redistributor *redist = (void *)header; + + gicv3_data.redist_bases[i++] = ioremap(redist->base_address, redist->length); + + return 0; +} + +static int gicv3_acpi_parse_madt_its(struct acpi_subtable_header *header) +{ + struct acpi_madt_generic_translator *its_entry = (void *)header; + + its_data.base = ioremap(its_entry->base_address, ACPI_GICV3_ITS_MEM_SIZE - 1); + + return 0; +} + +static int gic_init_acpi(void) +{ + int count; + + acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR, gic_acpi_version); + if (gic_version() == 2) { + acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT, + gicv2_acpi_parse_madt_cpu); + acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR, + gicv2_acpi_parse_madt_dist); + } else if (gic_version() == 3) { + acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR, + gicv3_acpi_parse_madt_dist); + count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR, + gicv3_acpi_parse_madt_redist); + if (!count) + acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT, + gicv3_acpi_parse_madt_gicc); + acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR, + gicv3_acpi_parse_madt_its); +#ifdef __aarch64__ + its_init(); +#endif + } + + return gic_version(); +} + +#else + +static int gic_init_acpi(void) +{ + assert_msg(false, "ACPI not available"); +} + +#endif /* CONFIG_EFI */ + +int gic_init(void) +{ + if (dt_available()) + return gic_init_fdt(); + else + return gic_init_acpi(); +} + void gic_enable_defaults(void) { if (!gic_common_ops) { diff --git a/lib/libcflat.h b/lib/libcflat.h index c1fd31ff..700f4352 100644 --- a/lib/libcflat.h +++ b/lib/libcflat.h @@ -161,6 +161,7 @@ extern void setup_vm(void); #define SZ_8K (1 << 13) #define SZ_16K (1 << 14) #define SZ_64K (1 << 16) +#define SZ_128K (1 << 17) #define SZ_1M (1 << 20) #define SZ_2M (1 << 21) #define SZ_1G (1 << 30)