diff options
| author | Atish Patra <atishp@rivosinc.com> | 2022-01-20 01:09:17 -0800 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2022-01-20 09:27:16 -0800 |
| commit | 2ffc48fc7071da4b2d881b0f21d37ed05feb697b (patch) | |
| tree | fa6687a62f494303c5baf45bcb05aefe9ba1526d /arch/riscv/Kconfig | |
| parent | 0b39eb38f85908e039ce8c9f09868438e029757b (diff) | |
RISC-V: Move spinwait booting method to its own config
The spinwait booting method should only be used for platforms with older
firmware without SBI HSM extension or M-mode firmware because spinwait
method can't support cpu hotplug, kexec or sparse hartid. It is better
to move the entire spinwait implementation to its own config which can
be disabled if required. It is enabled by default to maintain backward
compatibility and M-mode Linux.
Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv/Kconfig')
| -rw-r--r-- | arch/riscv/Kconfig | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 86553d8c6b07..fd60ab94260b 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -374,6 +374,20 @@ config RISCV_SBI_V01 This config allows kernel to use SBI v0.1 APIs. This will be deprecated in future once legacy M-mode software are no longer in use. +config RISCV_BOOT_SPINWAIT + bool "Spinwait booting method" + depends on SMP + default y + help + This enables support for booting Linux via spinwait method. In the + spinwait method, all cores randomly jump to Linux. One of the cores + gets chosen via lottery and all other keep spinning on a percpu + variable. This method cannot support CPU hotplug and sparse hartid + scheme. It should be only enabled for M-mode Linux or platforms relying + on older firmware without SBI HSM extension. All other platforms should + rely on ordered booting via SBI HSM extension which gets chosen + dynamically at runtime if the firmware supports it. + config KEXEC bool "Kexec system call" select KEXEC_CORE |