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LoongArch: Add hibernation (ACPI S4) support

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Add hibernation (Suspend to Disk, aka ACPI S4) support for LoongArch.

Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Huacai Chen 2022-12-10 22:40:15 +08:00
parent 366bb35a8e
commit 7db54bfe44
7 changed files with 154 additions and 0 deletions
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3
arch/loongarch/Kconfig
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@ -521,6 +521,9 @@ menu "Power management options"
config ARCH_SUSPEND_POSSIBLE
def_bool y
config ARCH_HIBERNATION_POSSIBLE
def_bool y
source "kernel/power/Kconfig"
source "drivers/acpi/Kconfig"

12
arch/loongarch/kernel/asm-offsets.c
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@ -257,3 +257,15 @@ void output_smpboot_defines(void)
BLANK();
}
#endif
#ifdef CONFIG_HIBERNATION
void output_pbe_defines(void)
{
COMMENT(" Linux struct pbe offsets. ");
OFFSET(PBE_ADDRESS, pbe, address);
OFFSET(PBE_ORIG_ADDRESS, pbe, orig_address);
OFFSET(PBE_NEXT, pbe, next);
DEFINE(PBE_SIZE, sizeof(struct pbe));
BLANK();
}
#endif

5
arch/loongarch/kernel/reset.c
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@ -15,6 +15,7 @@
#include <acpi/reboot.h>
#include <asm/idle.h>
#include <asm/loongarch.h>
#include <asm/loongson.h>
void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);
@ -41,6 +42,10 @@ void machine_power_off(void)
#ifdef CONFIG_SMP
preempt_disable();
smp_send_stop();
#endif
#ifdef CONFIG_PM
if (!acpi_disabled)
enable_pci_wakeup();
#endif
do_kernel_power_off();
#ifdef CONFIG_EFI

5
arch/loongarch/kernel/setup.c
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@ -31,6 +31,7 @@
#include <linux/libfdt.h>
#include <linux/of_fdt.h>
#include <linux/of_address.h>
#include <linux/suspend.h>
#include <linux/swiotlb.h>
#include <asm/addrspace.h>
@ -370,6 +371,10 @@ static void __init arch_mem_init(char **cmdline_p)
dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
/* Reserve for hibernation. */
register_nosave_region(PFN_DOWN(__pa_symbol(&__nosave_begin)),
PFN_UP(__pa_symbol(&__nosave_end)));
memblock_dump_all();
early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));

1
arch/loongarch/power/Makefile
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@ -1,3 +1,4 @@
obj-y += platform.o
obj-$(CONFIG_SUSPEND) += suspend.o suspend_asm.o
obj-$(CONFIG_HIBERNATION) += hibernate.o hibernate_asm.o

62
arch/loongarch/power/hibernate.c Normal file
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@ -0,0 +1,62 @@
// SPDX-License-Identifier: GPL-2.0
#include <asm/fpu.h>
#include <asm/loongson.h>
#include <asm/sections.h>
#include <asm/tlbflush.h>
#include <linux/suspend.h>
static u32 saved_crmd;
static u32 saved_prmd;
static u32 saved_euen;
static u32 saved_ecfg;
static u64 saved_pcpu_base;
struct pt_regs saved_regs;
void save_processor_state(void)
{
saved_crmd = csr_read32(LOONGARCH_CSR_CRMD);
saved_prmd = csr_read32(LOONGARCH_CSR_PRMD);
saved_euen = csr_read32(LOONGARCH_CSR_EUEN);
saved_ecfg = csr_read32(LOONGARCH_CSR_ECFG);
saved_pcpu_base = csr_read64(PERCPU_BASE_KS);
if (is_fpu_owner())
save_fp(current);
}
void restore_processor_state(void)
{
csr_write32(saved_crmd, LOONGARCH_CSR_CRMD);
csr_write32(saved_prmd, LOONGARCH_CSR_PRMD);
csr_write32(saved_euen, LOONGARCH_CSR_EUEN);
csr_write32(saved_ecfg, LOONGARCH_CSR_ECFG);
csr_write64(saved_pcpu_base, PERCPU_BASE_KS);
if (is_fpu_owner())
restore_fp(current);
}
int pfn_is_nosave(unsigned long pfn)
{
unsigned long nosave_begin_pfn = PFN_DOWN(__pa(&__nosave_begin));
unsigned long nosave_end_pfn = PFN_UP(__pa(&__nosave_end));
return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
}
extern int swsusp_asm_suspend(void);
int swsusp_arch_suspend(void)
{
enable_pci_wakeup();
return swsusp_asm_suspend();
}
extern int swsusp_asm_resume(void);
int swsusp_arch_resume(void)
{
/* Avoid TLB mismatch during and after kernel resume */
local_flush_tlb_all();
return swsusp_asm_resume();
}

66
arch/loongarch/power/hibernate_asm.S Normal file
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@ -0,0 +1,66 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Hibernation support specific for LoongArch
*
* Author: Huacai Chen <chenhuacai@loongson.cn>
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#include <linux/linkage.h>
#include <asm/asm.h>
#include <asm/asm-offsets.h>
#include <asm/regdef.h>
.text
SYM_FUNC_START(swsusp_asm_suspend)
la.pcrel t0, saved_regs
PTR_S ra, t0, PT_R1
PTR_S tp, t0, PT_R2
PTR_S sp, t0, PT_R3
PTR_S u0, t0, PT_R21
PTR_S fp, t0, PT_R22
PTR_S s0, t0, PT_R23
PTR_S s1, t0, PT_R24
PTR_S s2, t0, PT_R25
PTR_S s3, t0, PT_R26
PTR_S s4, t0, PT_R27
PTR_S s5, t0, PT_R28
PTR_S s6, t0, PT_R29
PTR_S s7, t0, PT_R30
PTR_S s8, t0, PT_R31
b swsusp_save
SYM_FUNC_END(swsusp_asm_suspend)
SYM_FUNC_START(swsusp_asm_resume)
la.pcrel t0, restore_pblist
PTR_L t0, t0, 0
0:
PTR_L t1, t0, PBE_ADDRESS /* source */
PTR_L t2, t0, PBE_ORIG_ADDRESS /* destination */
PTR_LI t3, _PAGE_SIZE
PTR_ADD t3, t3, t1
1:
REG_L t8, t1, 0
REG_S t8, t2, 0
PTR_ADDI t1, t1, SZREG
PTR_ADDI t2, t2, SZREG
bne t1, t3, 1b
PTR_L t0, t0, PBE_NEXT
bnez t0, 0b
la.pcrel t0, saved_regs
PTR_L ra, t0, PT_R1
PTR_L tp, t0, PT_R2
PTR_L sp, t0, PT_R3
PTR_L u0, t0, PT_R21
PTR_L fp, t0, PT_R22
PTR_L s0, t0, PT_R23
PTR_L s1, t0, PT_R24
PTR_L s2, t0, PT_R25
PTR_L s3, t0, PT_R26
PTR_L s4, t0, PT_R27
PTR_L s5, t0, PT_R28
PTR_L s6, t0, PT_R29
PTR_L s7, t0, PT_R30
PTR_L s8, t0, PT_R31
PTR_LI a0, 0x0
jirl zero, ra, 0
SYM_FUNC_END(swsusp_asm_resume)