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lib: sbi_hsm: handle failure when hart_stop returns SBI_ENOTSUPP

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Make use of generic warm-boot path when platform hart_stop callback
returns SBI_ENOTSUPP, in case certain hart can not turn off its
power domain, or it detects some error occured in power management
unit, it can fall through warm-boot flow and wait for interrupt in
sbi_hsm_hart_wait().

Also improves comment in sbi_hsm_hart_wait().

Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Yu Chien Peter Lin
2023-01-20 11:05:08 +08:00
committed by Anup Patel
parent ce2a834c98
commit 8ecbe6d3fb
2 changed files with 9 additions and 6 deletions
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8
include/sbi/sbi_hsm.h
View File

@@ -21,8 +21,12 @@ struct sbi_hsm_device {
int (*hart_start)(u32 hartid, ulong saddr);
/**
* Stop (or power-down) the current hart from running. This call
* doesn't expect to return if success.
* Stop (or power-down) the current hart from running.
*
* Return SBI_ENOTSUPP if the hart does not support platform-specific
* stop actions.
*
* For successful stop, the call won't return.
*/
int (*hart_stop)(void);

7
lib/sbi/sbi_hsm.c
View File

@@ -116,7 +116,7 @@ static void sbi_hsm_hart_wait(struct sbi_scratch *scratch, u32 hartid)
/* Set MSIE and MEIE bits to receive IPI */
csr_set(CSR_MIE, MIP_MSIP | MIP_MEIP);
/* Wait for hart_add call*/
/* Wait for state transition requested by sbi_hsm_hart_start() */
while (atomic_read(&hdata->state) != SBI_HSM_STATE_START_PENDING) {
wfi();
};
@@ -228,9 +228,8 @@ void __noreturn sbi_hsm_exit(struct sbi_scratch *scratch)
goto fail_exit;
if (hsm_device_has_hart_hotplug()) {
hsm_device_hart_stop();
/* It should never reach here */
goto fail_exit;
if (hsm_device_hart_stop() != SBI_ENOTSUPP)
goto fail_exit;
}
/**