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linux/arch/riscv/kernel/hibernate-asm.S

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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>
2023-03-30 14:43:21 +08:00
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Hibernation low level support for RISCV.
*
* Copyright (C) 2023 StarFive Technology Co., Ltd.
*
* Author: Jee Heng Sia <jeeheng.sia@starfivetech.com>
*/
#include <asm/asm.h>
#include <asm/asm-offsets.h>
#include <asm/assembler.h>
#include <asm/csr.h>
#include <linux/linkage.h>
/*
* int __hibernate_cpu_resume(void)
* Switch back to the hibernated image's page table prior to restoring the CPU
* context.
*
* Always returns 0
*/
ENTRY(__hibernate_cpu_resume)
/* switch to hibernated image's page table. */
csrw CSR_SATP, s0
sfence.vma
REG_L a0, hibernate_cpu_context
suspend_restore_regs
/* Return zero value. */
mv a0, zero
ret
END(__hibernate_cpu_resume)
/*
* Prepare to restore the image.
* a0: satp of saved page tables.
* a1: satp of temporary page tables.
* a2: cpu_resume.
*/
ENTRY(hibernate_restore_image)
mv s0, a0
mv s1, a1
mv s2, a2
REG_L s4, restore_pblist
REG_L a1, relocated_restore_code
riscv: hibernation: Replace jalr with jr before suspend_restore_regs No need to link the x1/ra reg via jalr before suspend_restore_regs So it's better to replace jalr with jr. Signed-off-by: Song Shuai <suagrfillet@gmail.com> Reviewed-by: JeeHeng Sia <jeeheng.sia@starfivetech.com > Link: https://lore.kernel.org/r/20230519060854.214138-1-suagrfillet@gmail.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2023-05-19 14:08:54 +08:00
jr a1
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>
2023-03-30 14:43:21 +08:00
END(hibernate_restore_image)
/*
* The below code will be executed from a 'safe' page.
* It first switches to the temporary page table, then starts to copy the pages
* back to the original memory location. Finally, it jumps to __hibernate_cpu_resume()
* to restore the CPU context.
*/
ENTRY(hibernate_core_restore_code)
/* switch to temp page table. */
csrw satp, s1
sfence.vma
.Lcopy:
/* The below code will restore the hibernated image. */
REG_L a1, HIBERN_PBE_ADDR(s4)
REG_L a0, HIBERN_PBE_ORIG(s4)
copy_page a0, a1
REG_L s4, HIBERN_PBE_NEXT(s4)
bnez s4, .Lcopy
riscv: hibernation: Replace jalr with jr before suspend_restore_regs No need to link the x1/ra reg via jalr before suspend_restore_regs So it's better to replace jalr with jr. Signed-off-by: Song Shuai <suagrfillet@gmail.com> Reviewed-by: JeeHeng Sia <jeeheng.sia@starfivetech.com > Link: https://lore.kernel.org/r/20230519060854.214138-1-suagrfillet@gmail.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2023-05-19 14:08:54 +08:00
jr s2
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>
2023-03-30 14:43:21 +08:00
END(hibernate_core_restore_code)
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