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| author | Nick Hu <nick.hu@sifive.com> | 2025-02-19 14:41:34 +0300 |
|---|---|---|
| committer | Alexandre Ghiti <alexghiti@rivosinc.com> | 2025-03-18 15:59:03 +0300 |
| commit | ffef54ad41101f98ea6dd1dcd71c60bb6b7c8ee9 (patch) | |
| tree | 6844b8eb649ff9d37bdd6ca4d6a004fdd53f1c83 | |
| parent | 6586788f0a8d0f3b33b1383885575f5b5f7b9dad (diff) | |
| download | linux-ffef54ad41101f98ea6dd1dcd71c60bb6b7c8ee9.tar.xz | |
riscv: Add stimecmp save and restore
If the HW support the SSTC extension, we should save and restore the
stimecmp register while cpu non retention suspend.
Signed-off-by: Nick Hu <nick.hu@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20250219114135.27764-2-nick.hu@sifive.com
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
| -rw-r--r-- | arch/riscv/include/asm/suspend.h | 4 | ||||
| -rw-r--r-- | arch/riscv/kernel/suspend.c | 14 |
2 files changed, 18 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/suspend.h b/arch/riscv/include/asm/suspend.h index 4ffb022b097f..dc5782b5fbad 100644 --- a/arch/riscv/include/asm/suspend.h +++ b/arch/riscv/include/asm/suspend.h @@ -18,6 +18,10 @@ struct suspend_context { unsigned long ie; #ifdef CONFIG_MMU unsigned long satp; + unsigned long stimecmp; +#if __riscv_xlen < 64 + unsigned long stimecmph; +#endif #endif }; diff --git a/arch/riscv/kernel/suspend.c b/arch/riscv/kernel/suspend.c index 9a8a0dc035b2..24b3f57d467f 100644 --- a/arch/riscv/kernel/suspend.c +++ b/arch/riscv/kernel/suspend.c @@ -30,6 +30,13 @@ void suspend_save_csrs(struct suspend_context *context) */ #ifdef CONFIG_MMU + if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SSTC)) { + context->stimecmp = csr_read(CSR_STIMECMP); +#if __riscv_xlen < 64 + context->stimecmph = csr_read(CSR_STIMECMPH); +#endif + } + context->satp = csr_read(CSR_SATP); #endif } @@ -43,6 +50,13 @@ void suspend_restore_csrs(struct suspend_context *context) csr_write(CSR_IE, context->ie); #ifdef CONFIG_MMU + if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SSTC)) { + csr_write(CSR_STIMECMP, context->stimecmp); +#if __riscv_xlen < 64 + csr_write(CSR_STIMECMPH, context->stimecmph); +#endif + } + csr_write(CSR_SATP, context->satp); #endif } |