From b20ed9febe0b78228055ce69d8e3fbb13f64f1cc Mon Sep 17 00:00:00 2001 From: Samuel Holland Date: Sun, 12 Jun 2022 20:03:47 -0500 Subject: lib: sbi_hsm: Call a device hook during hart resume Non-retentive suspend states may require platform-specific actions during resume. For example, firmware may need to save and restore the values of custom CSRs. Add a hook to support this. Reviewed-by: Anup Patel Signed-off-by: Samuel Holland --- include/sbi/sbi_hsm.h | 8 ++++++++ lib/sbi/sbi_hsm.c | 8 ++++++++ 2 files changed, 16 insertions(+) diff --git a/include/sbi/sbi_hsm.h b/include/sbi/sbi_hsm.h index c16e871..6da8cee 100644 --- a/include/sbi/sbi_hsm.h +++ b/include/sbi/sbi_hsm.h @@ -37,6 +37,14 @@ struct sbi_hsm_device { * specified resume address */ int (*hart_suspend)(u32 suspend_type, ulong raddr); + + /** + * Perform platform-specific actions to resume from a suspended state. + * + * This includes restoring any platform state that was lost during + * non-retentive suspend. + */ + void (*hart_resume)(void); }; struct sbi_domain; diff --git a/lib/sbi/sbi_hsm.c b/lib/sbi/sbi_hsm.c index c4d2c6d..a7b6a80 100644 --- a/lib/sbi/sbi_hsm.c +++ b/lib/sbi/sbi_hsm.c @@ -178,6 +178,12 @@ static int hsm_device_hart_suspend(u32 suspend_type, ulong raddr) return SBI_ENOTSUPP; } +static void hsm_device_hart_resume(void) +{ + if (hsm_dev && hsm_dev->hart_resume) + hsm_dev->hart_resume(); +} + int sbi_hsm_init(struct sbi_scratch *scratch, u32 hartid, bool cold_boot) { u32 i; @@ -384,6 +390,8 @@ void sbi_hsm_hart_resume_start(struct sbi_scratch *scratch) __func__, oldstate); sbi_hart_hang(); } + + hsm_device_hart_resume(); } void sbi_hsm_hart_resume_finish(struct sbi_scratch *scratch) -- cgit v1.2.3