diff options
| author | Atish Patra <atish.patra@wdc.com> | 2020-03-18 02:11:40 +0100 |
|---|---|---|
| committer | Palmer Dabbelt <palmerdabbelt@google.com> | 2020-03-31 20:25:56 +0200 |
| commit | 2875fe0561569f82d0e63658ccf0d11ce7da8922 (patch) | |
| tree | 1d6539c565bf2eb03efb776a2032d48eae4763c4 /arch/riscv/include | |
| parent | RISC-V: Move relocate and few other functions out of __init (diff) | |
| download | linux-2875fe0561569f82d0e63658ccf0d11ce7da8922.tar.xz linux-2875fe0561569f82d0e63658ccf0d11ce7da8922.zip | |
RISC-V: Add cpu_ops and modify default booting method
Currently, all non-booting harts start booting after the booting hart
updates the per-hart stack pointer. This is done in a way that, it's
difficult to implement any other booting method without breaking the
backward compatibility.
Define a cpu_ops method that allows to introduce other booting methods
in future. Modify the current booting method to be compatible with
cpu_ops.
Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'arch/riscv/include')
| -rw-r--r-- | arch/riscv/include/asm/cpu_ops.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/cpu_ops.h b/arch/riscv/include/asm/cpu_ops.h new file mode 100644 index 000000000000..5ce81a28e1d9 --- /dev/null +++ b/arch/riscv/include/asm/cpu_ops.h @@ -0,0 +1,34 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (c) 2020 Western Digital Corporation or its affiliates. + * Based on arch/arm64/include/asm/cpu_ops.h + */ +#ifndef __ASM_CPU_OPS_H +#define __ASM_CPU_OPS_H + +#include <linux/init.h> +#include <linux/sched.h> +#include <linux/threads.h> + +/** + * struct cpu_operations - Callback operations for hotplugging CPUs. + * + * @name: Name of the boot protocol. + * @cpu_prepare: Early one-time preparation step for a cpu. If there + * is a mechanism for doing so, tests whether it is + * possible to boot the given HART. + * @cpu_start: Boots a cpu into the kernel. + */ +struct cpu_operations { + const char *name; + int (*cpu_prepare)(unsigned int cpu); + int (*cpu_start)(unsigned int cpu, + struct task_struct *tidle); +}; + +extern const struct cpu_operations *cpu_ops[NR_CPUS]; +void __init cpu_set_ops(int cpu); +void cpu_update_secondary_bootdata(unsigned int cpuid, + struct task_struct *tidle); + +#endif /* ifndef __ASM_CPU_OPS_H */ |