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hw/riscv/virt: Enable basic ACPI infrastructure
Add basic ACPI infrastructure for RISC-V with below tables. 1) DSDT with below basic objects - CPUs - fw_cfg 2) FADT revision 6 with HW_REDUCED flag 3) XSDT 4) RSDP Add this functionality in a new file virt-acpi-build.c and enable building this infrastructure. Signed-off-by: Sunil V L <sunilvl@ventanamicro.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Message-ID: <20230302091212.999767-5-sunilvl@ventanamicro.com> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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@ -44,6 +44,7 @@ config RISCV_VIRT
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select VIRTIO_MMIO
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select FW_CFG_DMA
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select PLATFORM_BUS
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select ACPI
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config SHAKTI_C
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bool
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@ -9,5 +9,6 @@ riscv_ss.add(when: 'CONFIG_SIFIVE_E', if_true: files('sifive_e.c'))
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riscv_ss.add(when: 'CONFIG_SIFIVE_U', if_true: files('sifive_u.c'))
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riscv_ss.add(when: 'CONFIG_SPIKE', if_true: files('spike.c'))
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riscv_ss.add(when: 'CONFIG_MICROCHIP_PFSOC', if_true: files('microchip_pfsoc.c'))
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riscv_ss.add(when: 'CONFIG_ACPI', if_true: files('virt-acpi-build.c'))
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hw_arch += {'riscv': riscv_ss}
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304
hw/riscv/virt-acpi-build.c
Normal file
304
hw/riscv/virt-acpi-build.c
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@ -0,0 +1,304 @@
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/*
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* Support for generating ACPI tables and passing them to Guests
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*
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* RISC-V virt ACPI generation
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*
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* Copyright (C) 2008-2010 Kevin O'Connor <kevin@koconnor.net>
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* Copyright (C) 2006 Fabrice Bellard
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* Copyright (C) 2013 Red Hat Inc
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* Copyright (c) 2015 HUAWEI TECHNOLOGIES CO.,LTD.
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* Copyright (C) 2021-2023 Ventana Micro Systems Inc
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "hw/acpi/acpi-defs.h"
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#include "hw/acpi/acpi.h"
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#include "hw/acpi/aml-build.h"
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#include "hw/acpi/utils.h"
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#include "qapi/error.h"
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#include "sysemu/reset.h"
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#include "migration/vmstate.h"
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#include "hw/riscv/virt.h"
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#define ACPI_BUILD_TABLE_SIZE 0x20000
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typedef struct AcpiBuildState {
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/* Copy of table in RAM (for patching) */
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MemoryRegion *table_mr;
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MemoryRegion *rsdp_mr;
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MemoryRegion *linker_mr;
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/* Is table patched? */
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bool patched;
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} AcpiBuildState;
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static void acpi_align_size(GArray *blob, unsigned align)
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{
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/*
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* Align size to multiple of given size. This reduces the chance
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* we need to change size in the future (breaking cross version migration).
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*/
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g_array_set_size(blob, ROUND_UP(acpi_data_len(blob), align));
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}
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static void riscv_acpi_madt_add_rintc(uint32_t uid,
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const CPUArchIdList *arch_ids,
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GArray *entry)
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{
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uint64_t hart_id = arch_ids->cpus[uid].arch_id;
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build_append_int_noprefix(entry, 0x18, 1); /* Type */
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build_append_int_noprefix(entry, 20, 1); /* Length */
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build_append_int_noprefix(entry, 1, 1); /* Version */
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build_append_int_noprefix(entry, 0, 1); /* Reserved */
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build_append_int_noprefix(entry, 0x1, 4); /* Flags */
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build_append_int_noprefix(entry, hart_id, 8); /* Hart ID */
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build_append_int_noprefix(entry, uid, 4); /* ACPI Processor UID */
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}
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static void acpi_dsdt_add_cpus(Aml *scope, RISCVVirtState *s)
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{
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MachineClass *mc = MACHINE_GET_CLASS(s);
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MachineState *ms = MACHINE(s);
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const CPUArchIdList *arch_ids = mc->possible_cpu_arch_ids(ms);
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for (int i = 0; i < arch_ids->len; i++) {
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Aml *dev;
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GArray *madt_buf = g_array_new(0, 1, 1);
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dev = aml_device("C%.03X", i);
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aml_append(dev, aml_name_decl("_HID", aml_string("ACPI0007")));
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aml_append(dev, aml_name_decl("_UID",
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aml_int(arch_ids->cpus[i].arch_id)));
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/* build _MAT object */
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riscv_acpi_madt_add_rintc(i, arch_ids, madt_buf);
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aml_append(dev, aml_name_decl("_MAT",
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aml_buffer(madt_buf->len,
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(uint8_t *)madt_buf->data)));
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g_array_free(madt_buf, true);
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aml_append(scope, dev);
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}
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}
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static void acpi_dsdt_add_fw_cfg(Aml *scope, const MemMapEntry *fw_cfg_memmap)
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{
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Aml *dev = aml_device("FWCF");
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aml_append(dev, aml_name_decl("_HID", aml_string("QEMU0002")));
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/* device present, functioning, decoding, not shown in UI */
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aml_append(dev, aml_name_decl("_STA", aml_int(0xB)));
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aml_append(dev, aml_name_decl("_CCA", aml_int(1)));
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Aml *crs = aml_resource_template();
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aml_append(crs, aml_memory32_fixed(fw_cfg_memmap->base,
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fw_cfg_memmap->size, AML_READ_WRITE));
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aml_append(dev, aml_name_decl("_CRS", crs));
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aml_append(scope, dev);
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}
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/* FADT */
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static void build_fadt_rev6(GArray *table_data,
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BIOSLinker *linker,
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RISCVVirtState *s,
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unsigned dsdt_tbl_offset)
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{
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AcpiFadtData fadt = {
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.rev = 6,
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.minor_ver = 5,
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.flags = 1 << ACPI_FADT_F_HW_REDUCED_ACPI,
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.xdsdt_tbl_offset = &dsdt_tbl_offset,
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};
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build_fadt(table_data, linker, &fadt, s->oem_id, s->oem_table_id);
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}
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/* DSDT */
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static void build_dsdt(GArray *table_data,
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BIOSLinker *linker,
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RISCVVirtState *s)
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{
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Aml *scope, *dsdt;
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const MemMapEntry *memmap = s->memmap;
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AcpiTable table = { .sig = "DSDT", .rev = 2, .oem_id = s->oem_id,
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.oem_table_id = s->oem_table_id };
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acpi_table_begin(&table, table_data);
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dsdt = init_aml_allocator();
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/*
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* When booting the VM with UEFI, UEFI takes ownership of the RTC hardware.
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* While UEFI can use libfdt to disable the RTC device node in the DTB that
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* it passes to the OS, it cannot modify AML. Therefore, we won't generate
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* the RTC ACPI device at all when using UEFI.
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*/
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scope = aml_scope("\\_SB");
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acpi_dsdt_add_cpus(scope, s);
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acpi_dsdt_add_fw_cfg(scope, &memmap[VIRT_FW_CFG]);
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aml_append(dsdt, scope);
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/* copy AML table into ACPI tables blob and patch header there */
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g_array_append_vals(table_data, dsdt->buf->data, dsdt->buf->len);
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acpi_table_end(linker, &table);
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free_aml_allocator();
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}
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static void virt_acpi_build(RISCVVirtState *s, AcpiBuildTables *tables)
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{
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GArray *table_offsets;
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unsigned dsdt, xsdt;
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GArray *tables_blob = tables->table_data;
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table_offsets = g_array_new(false, true,
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sizeof(uint32_t));
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bios_linker_loader_alloc(tables->linker,
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ACPI_BUILD_TABLE_FILE, tables_blob,
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64, false);
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/* DSDT is pointed to by FADT */
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dsdt = tables_blob->len;
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build_dsdt(tables_blob, tables->linker, s);
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/* FADT and others pointed to by XSDT */
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acpi_add_table(table_offsets, tables_blob);
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build_fadt_rev6(tables_blob, tables->linker, s, dsdt);
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/* XSDT is pointed to by RSDP */
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xsdt = tables_blob->len;
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build_xsdt(tables_blob, tables->linker, table_offsets, s->oem_id,
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s->oem_table_id);
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/* RSDP is in FSEG memory, so allocate it separately */
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{
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AcpiRsdpData rsdp_data = {
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.revision = 2,
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.oem_id = s->oem_id,
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.xsdt_tbl_offset = &xsdt,
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.rsdt_tbl_offset = NULL,
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};
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build_rsdp(tables->rsdp, tables->linker, &rsdp_data);
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}
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/*
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* The align size is 128, warn if 64k is not enough therefore
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* the align size could be resized.
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*/
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if (tables_blob->len > ACPI_BUILD_TABLE_SIZE / 2) {
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warn_report("ACPI table size %u exceeds %d bytes,"
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" migration may not work",
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tables_blob->len, ACPI_BUILD_TABLE_SIZE / 2);
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error_printf("Try removing some objects.");
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}
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acpi_align_size(tables_blob, ACPI_BUILD_TABLE_SIZE);
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/* Clean up memory that's no longer used */
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g_array_free(table_offsets, true);
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}
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static void acpi_ram_update(MemoryRegion *mr, GArray *data)
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{
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uint32_t size = acpi_data_len(data);
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/*
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* Make sure RAM size is correct - in case it got changed
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* e.g. by migration
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*/
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memory_region_ram_resize(mr, size, &error_abort);
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memcpy(memory_region_get_ram_ptr(mr), data->data, size);
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memory_region_set_dirty(mr, 0, size);
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}
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static void virt_acpi_build_update(void *build_opaque)
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{
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AcpiBuildState *build_state = build_opaque;
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AcpiBuildTables tables;
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/* No state to update or already patched? Nothing to do. */
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if (!build_state || build_state->patched) {
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return;
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}
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build_state->patched = true;
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acpi_build_tables_init(&tables);
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virt_acpi_build(RISCV_VIRT_MACHINE(qdev_get_machine()), &tables);
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acpi_ram_update(build_state->table_mr, tables.table_data);
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acpi_ram_update(build_state->rsdp_mr, tables.rsdp);
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acpi_ram_update(build_state->linker_mr, tables.linker->cmd_blob);
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acpi_build_tables_cleanup(&tables, true);
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}
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static void virt_acpi_build_reset(void *build_opaque)
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{
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AcpiBuildState *build_state = build_opaque;
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build_state->patched = false;
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}
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static const VMStateDescription vmstate_virt_acpi_build = {
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.name = "virt_acpi_build",
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.version_id = 1,
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.minimum_version_id = 1,
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.fields = (VMStateField[]) {
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VMSTATE_BOOL(patched, AcpiBuildState),
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VMSTATE_END_OF_LIST()
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},
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};
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void virt_acpi_setup(RISCVVirtState *s)
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{
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AcpiBuildTables tables;
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AcpiBuildState *build_state;
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build_state = g_malloc0(sizeof *build_state);
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acpi_build_tables_init(&tables);
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virt_acpi_build(s, &tables);
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/* Now expose it all to Guest */
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build_state->table_mr = acpi_add_rom_blob(virt_acpi_build_update,
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build_state, tables.table_data,
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ACPI_BUILD_TABLE_FILE);
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assert(build_state->table_mr != NULL);
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build_state->linker_mr = acpi_add_rom_blob(virt_acpi_build_update,
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build_state,
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tables.linker->cmd_blob,
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ACPI_BUILD_LOADER_FILE);
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build_state->rsdp_mr = acpi_add_rom_blob(virt_acpi_build_update,
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build_state, tables.rsdp,
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ACPI_BUILD_RSDP_FILE);
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qemu_register_reset(virt_acpi_build_reset, build_state);
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virt_acpi_build_reset(build_state);
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vmstate_register(NULL, 0, &vmstate_virt_acpi_build, build_state);
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/*
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* Clean up tables but don't free the memory: we track it
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* in build_state.
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*/
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acpi_build_tables_cleanup(&tables, false);
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}
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@ -126,4 +126,5 @@ enum {
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1 + FDT_APLIC_INT_CELLS)
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bool virt_is_acpi_enabled(RISCVVirtState *s);
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void virt_acpi_setup(RISCVVirtState *vms);
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#endif
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