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-rw-r--r--arch/loongarch/Kconfig3
-rw-r--r--arch/loongarch/kernel/asm-offsets.c12
-rw-r--r--arch/loongarch/kernel/reset.c5
-rw-r--r--arch/loongarch/kernel/setup.c5
-rw-r--r--arch/loongarch/power/Makefile1
-rw-r--r--arch/loongarch/power/hibernate.c62
-rw-r--r--arch/loongarch/power/hibernate_asm.S66
7 files changed, 154 insertions, 0 deletions
diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index 0c8b2b1a9626..576a649ac13c 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -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"
diff --git a/arch/loongarch/kernel/asm-offsets.c b/arch/loongarch/kernel/asm-offsets.c
index bdd88eda9513..4ef494577813 100644
--- a/arch/loongarch/kernel/asm-offsets.c
+++ b/arch/loongarch/kernel/asm-offsets.c
@@ -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
diff --git a/arch/loongarch/kernel/reset.c b/arch/loongarch/kernel/reset.c
index 8c82021eb2f4..1ef8c6383535 100644
--- a/arch/loongarch/kernel/reset.c
+++ b/arch/loongarch/kernel/reset.c
@@ -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);
@@ -42,6 +43,10 @@ void machine_power_off(void)
preempt_disable();
smp_send_stop();
#endif
+#ifdef CONFIG_PM
+ if (!acpi_disabled)
+ enable_pci_wakeup();
+#endif
do_kernel_power_off();
#ifdef CONFIG_EFI
efi.reset_system(EFI_RESET_SHUTDOWN, EFI_SUCCESS, 0, NULL);
diff --git a/arch/loongarch/kernel/setup.c b/arch/loongarch/kernel/setup.c
index fdabf2ac1927..4344502c0b31 100644
--- a/arch/loongarch/kernel/setup.c
+++ b/arch/loongarch/kernel/setup.c
@@ -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));
diff --git a/arch/loongarch/power/Makefile b/arch/loongarch/power/Makefile
index 6740117decaa..58151d003e40 100644
--- a/arch/loongarch/power/Makefile
+++ b/arch/loongarch/power/Makefile
@@ -1,3 +1,4 @@
obj-y += platform.o
obj-$(CONFIG_SUSPEND) += suspend.o suspend_asm.o
+obj-$(CONFIG_HIBERNATION) += hibernate.o hibernate_asm.o
diff --git a/arch/loongarch/power/hibernate.c b/arch/loongarch/power/hibernate.c
new file mode 100644
index 000000000000..1e0590542f98
--- /dev/null
+++ b/arch/loongarch/power/hibernate.c
@@ -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();
+}
diff --git a/arch/loongarch/power/hibernate_asm.S b/arch/loongarch/power/hibernate_asm.S
new file mode 100644
index 000000000000..3c747c08d65d
--- /dev/null
+++ b/arch/loongarch/power/hibernate_asm.S
@@ -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)