fa7d733901
While the processor is executing kernel code, the value of the scratch CSR is always zero, so there is no need to save the value. Continue to write the CSR during the resume flow, so we do not rely on firmware to initialize it. Signed-off-by: Samuel Holland <samuel.holland@sifive.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Link: https://lore.kernel.org/r/20240312195641.1830521-1-samuel.holland@sifive.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2021 Western Digital Corporation or its affiliates.
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* Copyright (c) 2022 Ventana Micro Systems Inc.
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*/
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#ifndef _ASM_RISCV_SUSPEND_H
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#define _ASM_RISCV_SUSPEND_H
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#include <asm/ptrace.h>
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struct suspend_context {
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/* Saved and restored by low-level functions */
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struct pt_regs regs;
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/* Saved and restored by high-level functions */
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unsigned long envcfg;
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unsigned long tvec;
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unsigned long ie;
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#ifdef CONFIG_MMU
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unsigned long satp;
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#endif
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};
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/*
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* Used by hibernation core and cleared during resume sequence
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*/
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extern int in_suspend;
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/* Low-level CPU suspend entry function */
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int __cpu_suspend_enter(struct suspend_context *context);
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/* High-level CPU suspend which will save context and call finish() */
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int cpu_suspend(unsigned long arg,
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int (*finish)(unsigned long arg,
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unsigned long entry,
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unsigned long context));
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/* Low-level CPU resume entry function */
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int __cpu_resume_enter(unsigned long hartid, unsigned long context);
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/* Used to save and restore the CSRs */
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void suspend_save_csrs(struct suspend_context *context);
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void suspend_restore_csrs(struct suspend_context *context);
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/* Low-level API to support hibernation */
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int swsusp_arch_suspend(void);
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int swsusp_arch_resume(void);
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int arch_hibernation_header_save(void *addr, unsigned int max_size);
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int arch_hibernation_header_restore(void *addr);
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int __hibernate_cpu_resume(void);
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/* Used to resume on the CPU we hibernated on */
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int hibernate_resume_nonboot_cpu_disable(void);
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asmlinkage void hibernate_restore_image(unsigned long resume_satp, unsigned long satp_temp,
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unsigned long cpu_resume);
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asmlinkage int hibernate_core_restore_code(void);
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bool riscv_sbi_hsm_is_supported(void);
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bool riscv_sbi_suspend_state_is_valid(u32 state);
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int riscv_sbi_hart_suspend(u32 state);
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#endif
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