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riscv: sbi: Introduce system suspend support

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When the SUSP SBI extension is present it implies that the standard
"suspend to RAM" type is available. Wire it up to the generic
platform suspend support, also applying the already present support
for non-retentive CPU suspend. When the kernel is built with
CONFIG_SUSPEND, one can do 'echo mem > /sys/power/state' to suspend.
Resumption will occur when a platform-specific wake-up event arrives.

Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Tested-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20231206110807.35882-4-ajones@ventanamicro.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Andrew Jones 2023-12-06 12:08:09 +01:00 committed by Palmer Dabbelt
parent 3a58275099
commit 4dc4af9ce3
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GPG Key ID: 2E1319F35FBB1889
3 changed files with 54 additions and 1 deletions
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2
arch/riscv/Kconfig
View File

@ -66,7 +66,7 @@ config RISCV
select CLINT_TIMER if !MMU
select CLONE_BACKWARDS
select COMMON_CLK
select CPU_PM if CPU_IDLE || HIBERNATION
select CPU_PM if CPU_IDLE || HIBERNATION || SUSPEND
select EDAC_SUPPORT
select FRAME_POINTER if PERF_EVENTS || (FUNCTION_TRACER && !DYNAMIC_FTRACE)
select GENERIC_ARCH_TOPOLOGY

9
arch/riscv/include/asm/sbi.h
View File

@ -29,6 +29,7 @@ enum sbi_ext_id {
SBI_EXT_RFENCE = 0x52464E43,
SBI_EXT_HSM = 0x48534D,
SBI_EXT_SRST = 0x53525354,
SBI_EXT_SUSP = 0x53555350,
SBI_EXT_PMU = 0x504D55,
SBI_EXT_DBCN = 0x4442434E,
@ -114,6 +115,14 @@ enum sbi_srst_reset_reason {
SBI_SRST_RESET_REASON_SYS_FAILURE,
};
enum sbi_ext_susp_fid {
SBI_EXT_SUSP_SYSTEM_SUSPEND = 0,
};
enum sbi_ext_susp_sleep_type {
SBI_SUSP_SLEEP_TYPE_SUSPEND_TO_RAM = 0,
};
enum sbi_ext_pmu_fid {
SBI_EXT_PMU_NUM_COUNTERS = 0,
SBI_EXT_PMU_COUNTER_GET_INFO,

44
arch/riscv/kernel/suspend.c
View File

@ -4,8 +4,12 @@
* Copyright (c) 2022 Ventana Micro Systems Inc.
*/
#define pr_fmt(fmt) "suspend: " fmt
#include <linux/ftrace.h>
#include <linux/suspend.h>
#include <asm/csr.h>
#include <asm/sbi.h>
#include <asm/suspend.h>
void suspend_save_csrs(struct suspend_context *context)
@ -85,3 +89,43 @@ int cpu_suspend(unsigned long arg,
return rc;
}
#ifdef CONFIG_RISCV_SBI
static int sbi_system_suspend(unsigned long sleep_type,
unsigned long resume_addr,
unsigned long opaque)
{
struct sbiret ret;
ret = sbi_ecall(SBI_EXT_SUSP, SBI_EXT_SUSP_SYSTEM_SUSPEND,
sleep_type, resume_addr, opaque, 0, 0, 0);
if (ret.error)
return sbi_err_map_linux_errno(ret.error);
return ret.value;
}
static int sbi_system_suspend_enter(suspend_state_t state)
{
return cpu_suspend(SBI_SUSP_SLEEP_TYPE_SUSPEND_TO_RAM, sbi_system_suspend);
}
static const struct platform_suspend_ops sbi_system_suspend_ops = {
.valid = suspend_valid_only_mem,
.enter = sbi_system_suspend_enter,
};
static int __init sbi_system_suspend_init(void)
{
if (sbi_spec_version >= sbi_mk_version(2, 0) &&
sbi_probe_extension(SBI_EXT_SUSP) > 0) {
pr_info("SBI SUSP extension detected\n");
if (IS_ENABLED(CONFIG_SUSPEND))
suspend_set_ops(&sbi_system_suspend_ops);
}
return 0;
}
arch_initcall(sbi_system_suspend_init);
#endif /* CONFIG_RISCV_SBI */