powerpc/pseries: Make query_cpu_stopped callable outside hotplug cpu

This moves query_cpu_stopped() out of the hotplug cpu code and into
smp.c so it can called in other places and renames it to
smp_query_cpu_stopped().

It also cleans up the return values by adding some #defines

Cc: <stable@kernel.org>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 22 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/pseries/smp.c b/arch/powerpc/platforms/pseries/smp.c
index 4e7f89a8456..20b694280a6 100644
--- a/arch/powerpc/platforms/pseries/smp.c
+++ b/arch/powerpc/platforms/pseries/smp.c
@@ -57,6 +57,28 @@
  */
 static cpumask_t of_spin_map;
 
+/* Query where a cpu is now.  Return codes #defined in plpar_wrappers.h */
+int smp_query_cpu_stopped(unsigned int pcpu)
+{
+        int cpu_status, status;
+        int qcss_tok = rtas_token("query-cpu-stopped-state");
+
+        if (qcss_tok == RTAS_UNKNOWN_SERVICE) {
+                printk(KERN_INFO "Firmware doesn't support "
+                                "query-cpu-stopped-state\n");
+                return QCSS_HARDWARE_ERROR;
+        }
+
+        status = rtas_call(qcss_tok, 1, 2, &cpu_status, pcpu);
+        if (status != 0) {
+                printk(KERN_ERR
+                       "RTAS query-cpu-stopped-state failed: %i\n", status);
+                return status;
+        }
+
+        return cpu_status;
+}
+
 /**
  * smp_startup_cpu() - start the given cpu
  *