From 701ba68342412ae9be99a7c7f3badebf95271403 Mon Sep 17 00:00:00 2001 From: Nathan Lynch Date: Mon, 7 Dec 2020 15:51:36 -0600 Subject: [PATCH] powerpc/rtas: add rtas_ibm_suspend_me() Now that the name is available, provide a simple wrapper for ibm,suspend-me which returns both a Linux errno and optionally the actual RTAS status to the caller. Signed-off-by: Nathan Lynch Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20201207215200.1785968-5-nathanl@linux.ibm.com --- arch/powerpc/include/asm/rtas.h | 1 + arch/powerpc/kernel/rtas.c | 57 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 58 insertions(+) diff --git a/arch/powerpc/include/asm/rtas.h b/arch/powerpc/include/asm/rtas.h index 8436ed0..b43165f 100644 --- a/arch/powerpc/include/asm/rtas.h +++ b/arch/powerpc/include/asm/rtas.h @@ -258,6 +258,7 @@ extern void rtas_progress(char *s, unsigned short hex); extern int rtas_suspend_cpu(struct rtas_suspend_me_data *data); extern int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data); int rtas_ibm_suspend_me_unsafe(u64 handle); +int rtas_ibm_suspend_me(int *fw_status); struct rtc_time; extern time64_t rtas_get_boot_time(void); diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c index 0a8e5dc..8a618a3 100644 --- a/arch/powerpc/kernel/rtas.c +++ b/arch/powerpc/kernel/rtas.c @@ -684,6 +684,63 @@ int rtas_set_indicator_fast(int indicator, int index, int new_value) return rc; } +/** + * rtas_ibm_suspend_me() - Call ibm,suspend-me to suspend the LPAR. + * + * @fw_status: RTAS call status will be placed here if not NULL. + * + * rtas_ibm_suspend_me() should be called only on a CPU which has + * received H_CONTINUE from the H_JOIN hcall. All other active CPUs + * should be waiting to return from H_JOIN. + * + * rtas_ibm_suspend_me() may suspend execution of the OS + * indefinitely. Callers should take appropriate measures upon return, such as + * resetting watchdog facilities. + * + * Callers may choose to retry this call if @fw_status is + * %RTAS_THREADS_ACTIVE. + * + * Return: + * 0 - The partition has resumed from suspend, possibly after + * migration to a different host. + * -ECANCELED - The operation was aborted. + * -EAGAIN - There were other CPUs not in H_JOIN at the time of the call. + * -EBUSY - Some other condition prevented the suspend from succeeding. + * -EIO - Hardware/platform error. + */ +int rtas_ibm_suspend_me(int *fw_status) +{ + int fwrc; + int ret; + + fwrc = rtas_call(rtas_token("ibm,suspend-me"), 0, 1, NULL); + + switch (fwrc) { + case 0: + ret = 0; + break; + case RTAS_SUSPEND_ABORTED: + ret = -ECANCELED; + break; + case RTAS_THREADS_ACTIVE: + ret = -EAGAIN; + break; + case RTAS_NOT_SUSPENDABLE: + case RTAS_OUTSTANDING_COPROC: + ret = -EBUSY; + break; + case -1: + default: + ret = -EIO; + break; + } + + if (fw_status) + *fw_status = fwrc; + + return ret; +} + void __noreturn rtas_restart(char *cmd) { if (rtas_flash_term_hook) -- 2.7.4