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| author | Sia Jee Heng <jeeheng.sia@starfivetech.com> | 2023-03-30 09:43:21 +0300 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2023-04-29 21:25:13 +0300 |
| commit | c0317210012e3b985779ddd92a7c5db8424e1e97 (patch) | |
| tree | 27affc08e8c4db7e8dfd5332429e3d95832c42b7 /arch/riscv/Kconfig | |
| parent | a15c90b67a662c75f469822a7f95c7aaa049e28f (diff) | |
| download | linux-c0317210012e3b985779ddd92a7c5db8424e1e97.tar.xz | |
RISC-V: Add arch functions to support hibernation/suspend-to-disk
Low level Arch functions were created to support hibernation.
swsusp_arch_suspend() relies code from __cpu_suspend_enter() to write
cpu state onto the stack, then calling swsusp_save() to save the memory
image.
Arch specific hibernation header is implemented and is utilized by the
arch_hibernation_header_restore() and arch_hibernation_header_save()
functions. The arch specific hibernation header consists of satp, hartid,
and the cpu_resume address. The kernel built version is also need to be
saved into the hibernation image header to making sure only the same
kernel is restore when resume.
swsusp_arch_resume() creates a temporary page table that covering only
the linear map. It copies the restore code to a 'safe' page, then start
to restore the memory image. Once completed, it restores the original
kernel's page table. It then calls into __hibernate_cpu_resume()
to restore the CPU context. Finally, it follows the normal hibernation
path back to the hibernation core.
To enable hibernation/suspend to disk into RISCV, the below config
need to be enabled:
- CONFIG_HIBERNATION
- CONFIG_ARCH_HIBERNATION_HEADER
- CONFIG_ARCH_HIBERNATION_POSSIBLE
Signed-off-by: Sia Jee Heng <jeeheng.sia@starfivetech.com>
Reviewed-by: Ley Foon Tan <leyfoon.tan@starfivetech.com>
Reviewed-by: Mason Huo <mason.huo@starfivetech.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20230330064321.1008373-5-jeeheng.sia@starfivetech.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv/Kconfig')
| -rw-r--r-- | arch/riscv/Kconfig | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index c5e42cc37604..0950049f5a28 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -54,7 +54,7 @@ config RISCV select CLINT_TIMER if !MMU select CLONE_BACKWARDS select COMMON_CLK - select CPU_PM if CPU_IDLE + select CPU_PM if CPU_IDLE || HIBERNATION select EDAC_SUPPORT select GENERIC_ARCH_TOPOLOGY select GENERIC_ATOMIC64 if !64BIT @@ -707,6 +707,12 @@ menu "Power management options" source "kernel/power/Kconfig" +config ARCH_HIBERNATION_POSSIBLE + def_bool y + +config ARCH_HIBERNATION_HEADER + def_bool HIBERNATION + endmenu # "Power management options" menu "CPU Power Management" |