mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-25 13:14:07 +08:00
c6399b8930
The suspend_restore_csrs is called in both __hibernate_cpu_resume
and the `else` of subsequent swsusp_arch_suspend.
Removing the first call makes both suspend_{save,restore}_csrs
left in swsusp_arch_suspend for clean code.
Fixes: c031721001 ("RISC-V: Add arch functions to support hibernation/suspend-to-disk")
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: JeeHeng Sia <jeeheng.sia@starfivetech.com>
Signed-off-by: Song Shuai <songshuaishuai@tinylab.org>
Link: https://lore.kernel.org/r/20230522025020.285042-1-songshuaishuai@tinylab.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
77 lines
1.6 KiB
ArmAsm
77 lines
1.6 KiB
ArmAsm
/* 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
|
|
|
|
jr a1
|
|
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
|
|
|
|
jr s2
|
|
END(hibernate_core_restore_code)
|