powerpc/rtas: add rtas_ibm_suspend_me() (701ba683) · Commits · 戴 / test

arch/powerpc/include/asm/rtas.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -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);

+57 −0

Original line number	Diff line number	Diff line
		@@ -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)