From 9c5180d7998b8e211ec038e5342b305e78e06e22 Mon Sep 17 00:00:00 2001 From: Daniel Henrique Barboza Date: Mon, 25 Sep 2023 14:56:51 -0300 Subject: [PATCH] target/riscv: introduce TCG AccelCPUClass target/riscv/cpu.c needs to handle all possible accelerators (TCG and KVM at this moment) during both init() and realize() time. This forces us to resort to a lot of "if tcg" and "if kvm" throughout the code, which isn't wrong, but can get cluttered over time. Splitting acceleration specific code from cpu.c to its own file will help to declutter the existing code and it will also make it easier to support KVM/TCG only builds in the future. We'll start by adding a new subdir called 'tcg' and a new file called 'tcg-cpu.c'. This file will be used to introduce a new accelerator class for TCG acceleration in RISC-V, allowing us to center all TCG exclusive code in its file instead of using 'cpu.c' for everything. This design is inpired by the work Claudio Fontana did in x86 a few years ago in commit f5cc5a5c1 ("i386: split cpu accelerators from cpu.c, using AccelCPUClass"). To avoid moving too much code at once we'll start by adding the new file and TCG AccelCPUClass declaration. The 'class_init' from the accel class will init 'tcg_ops', relieving the common riscv_cpu_class_init() from doing it. 'riscv_tcg_ops' is being exported from 'cpu.c' for now to avoid having to deal with moving code and files around right now. We'll focus on decoupling the realize() logic first. Signed-off-by: Daniel Henrique Barboza Reviewed-by: Andrew Jones Reviewed-by: LIU Zhiwei Reviewed-by: Alistair Francis Message-ID: <20230925175709.35696-2-dbarboza@ventanamicro.com> Signed-off-by: Alistair Francis --- target/riscv/cpu.c | 5 +--- target/riscv/cpu.h | 4 +++ target/riscv/meson.build | 2 ++ target/riscv/tcg/meson.build | 2 ++ target/riscv/tcg/tcg-cpu.c | 58 ++++++++++++++++++++++++++++++++++++ 5 files changed, 67 insertions(+), 4 deletions(-) create mode 100644 target/riscv/tcg/meson.build create mode 100644 target/riscv/tcg/tcg-cpu.c diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c index 383e5df2a7..89ce316294 100644 --- a/target/riscv/cpu.c +++ b/target/riscv/cpu.c @@ -2284,9 +2284,7 @@ static const struct SysemuCPUOps riscv_sysemu_ops = { }; #endif -#include "hw/core/tcg-cpu-ops.h" - -static const struct TCGCPUOps riscv_tcg_ops = { +const struct TCGCPUOps riscv_tcg_ops = { .initialize = riscv_translate_init, .synchronize_from_tb = riscv_cpu_synchronize_from_tb, .restore_state_to_opc = riscv_restore_state_to_opc, @@ -2445,7 +2443,6 @@ static void riscv_cpu_class_init(ObjectClass *c, void *data) #endif cc->gdb_arch_name = riscv_gdb_arch_name; cc->gdb_get_dynamic_xml = riscv_gdb_get_dynamic_xml; - cc->tcg_ops = &riscv_tcg_ops; object_class_property_add(c, "mvendorid", "uint32", cpu_get_mvendorid, cpu_set_mvendorid, NULL, NULL); diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h index cce6dee729..1bd736a1a0 100644 --- a/target/riscv/cpu.h +++ b/target/riscv/cpu.h @@ -707,6 +707,10 @@ enum riscv_pmu_event_idx { RISCV_PMU_EVENT_CACHE_ITLB_PREFETCH_MISS = 0x10021, }; +/* Export tcg_ops until we move everything to tcg/tcg-cpu.c */ +#include "hw/core/tcg-cpu-ops.h" +extern const struct TCGCPUOps riscv_tcg_ops; + /* CSR function table */ extern riscv_csr_operations csr_ops[CSR_TABLE_SIZE]; diff --git a/target/riscv/meson.build b/target/riscv/meson.build index ff60b21d04..b4ded65e41 100644 --- a/target/riscv/meson.build +++ b/target/riscv/meson.build @@ -38,5 +38,7 @@ riscv_system_ss.add(files( 'riscv-qmp-cmds.c', )) +subdir('tcg') + target_arch += {'riscv': riscv_ss} target_system_arch += {'riscv': riscv_system_ss} diff --git a/target/riscv/tcg/meson.build b/target/riscv/tcg/meson.build new file mode 100644 index 0000000000..061df3d74a --- /dev/null +++ b/target/riscv/tcg/meson.build @@ -0,0 +1,2 @@ +riscv_ss.add(when: 'CONFIG_TCG', if_true: files( + 'tcg-cpu.c')) diff --git a/target/riscv/tcg/tcg-cpu.c b/target/riscv/tcg/tcg-cpu.c new file mode 100644 index 0000000000..795a8f06b2 --- /dev/null +++ b/target/riscv/tcg/tcg-cpu.c @@ -0,0 +1,58 @@ +/* + * riscv TCG cpu class initialization + * + * Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu + * Copyright (c) 2017-2018 SiFive, Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2 or later, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see . + */ + +#include "qemu/osdep.h" +#include "cpu.h" +#include "qemu/accel.h" +#include "hw/core/accel-cpu.h" + +static void tcg_cpu_init_ops(AccelCPUClass *accel_cpu, CPUClass *cc) +{ + /* + * All cpus use the same set of operations. + * riscv_tcg_ops is being imported from cpu.c for now. + */ + cc->tcg_ops = &riscv_tcg_ops; +} + +static void tcg_cpu_class_init(CPUClass *cc) +{ + cc->init_accel_cpu = tcg_cpu_init_ops; +} + +static void tcg_cpu_accel_class_init(ObjectClass *oc, void *data) +{ + AccelCPUClass *acc = ACCEL_CPU_CLASS(oc); + + acc->cpu_class_init = tcg_cpu_class_init; +} + +static const TypeInfo tcg_cpu_accel_type_info = { + .name = ACCEL_CPU_NAME("tcg"), + + .parent = TYPE_ACCEL_CPU, + .class_init = tcg_cpu_accel_class_init, + .abstract = true, +}; + +static void tcg_cpu_accel_register_types(void) +{ + type_register_static(&tcg_cpu_accel_type_info); +} +type_init(tcg_cpu_accel_register_types);