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| author |   Andrew Jones <ajones@ventanamicro.com> | 2023-12-06 12:08:09 +0100 |
|---|---|---|
| committer |   Palmer Dabbelt <palmer@rivosinc.com> | 2024-01-11 07:36:26 -0800 |
| commit | 4dc4af9ce32681fbd16aa0e757ccba341cc9d4ca (patch) | |
| tree | 6f0c909636e563aeb5f5e1d94c752677e992199c /arch/riscv/kernel/suspend.c | |
| parent | Merge patch series "riscv: modules: Fix module loading error handling" (diff) | |
| download | wireguard-linux-4dc4af9ce32681fbd16aa0e757ccba341cc9d4ca.tar.xz wireguard-linux-4dc4af9ce32681fbd16aa0e757ccba341cc9d4ca.zip | |
riscv: sbi: Introduce system suspend support
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>
Diffstat (limited to 'arch/riscv/kernel/suspend.c')
| -rw-r--r-- | arch/riscv/kernel/suspend.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/riscv/kernel/suspend.c b/arch/riscv/kernel/suspend.c index 3c89b8ec69c4..239509367e42 100644 --- a/arch/riscv/kernel/suspend.c +++ b/arch/riscv/kernel/suspend.c @@ -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 */ |