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authorNathan Lynch <nathanl@linux.ibm.com>2020-12-07 15:51:36 -0600
committerMichael Ellerman <mpe@ellerman.id.au>2020-12-08 21:40:55 +1100
commit701ba68342412ae9be99a7c7f3badebf95271403 (patch)
treef0c85269797f161893d66df21593ef0a62d01bc1 /arch/powerpc/kernel/rtas.c
parent7049b288ea8c95f270ec8fe643e3c3187938d5af (diff)
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 <nathanl@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201207215200.1785968-5-nathanl@linux.ibm.com
Diffstat (limited to 'arch/powerpc/kernel/rtas.c')
-rw-r--r--arch/powerpc/kernel/rtas.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c
index 0a8e5dc2c108..8a618a3c4beb 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)