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>

3 files changed, 34 insertions, 26 deletions

diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c b/arch/powerpc/platforms/pseries/hotplug-cpu.c
index a8e1d5d17a28..b0760d7701b4 100644
--- a/arch/powerpc/platforms/pseries/hotplug-cpu.c
+++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c
@@ -154,30 +154,6 @@ static void pseries_mach_cpu_die(void)
         for(;;);
 }
 
-static int qcss_tok;    /* query-cpu-stopped-state token */
-
-/* Get state of physical CPU.
- * Return codes:
- *      0       - The processor is in the RTAS stopped state
- *      1       - stop-self is in progress
- *      2       - The processor is not in the RTAS stopped state
- *      -1      - Hardware Error
- *      -2      - Hardware Busy, Try again later.
- */
-static int query_cpu_stopped(unsigned int pcpu)
-{
-        int cpu_status, status;
-
-        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;
-}
-
 static int pseries_cpu_disable(void)
 {
         int cpu = smp_processor_id();
@@ -224,8 +200,9 @@ static void pseries_cpu_die(unsigned int cpu)
         } else if (get_preferred_offline_state(cpu) == CPU_STATE_OFFLINE) {
 
                 for (tries = 0; tries < 25; tries++) {
-                        cpu_status = query_cpu_stopped(pcpu);
-                        if (cpu_status == 0 || cpu_status == -1)
+                        cpu_status = smp_query_cpu_stopped(pcpu);
+                        if (cpu_status == QCSS_STOPPED ||
+                            cpu_status == QCSS_HARDWARE_ERROR)
                                 break;
                         cpu_relax();
                 }
@@ -388,6 +365,7 @@ static int __init pseries_cpu_hotplug_init(void)
         struct device_node *np;
         const char *typep;
         int cpu;
+        int qcss_tok;
 
         for_each_node_by_name(np, "interrupt-controller") {
                 typep = of_get_property(np, "compatible", NULL);
diff --git a/arch/powerpc/platforms/pseries/plpar_wrappers.h b/arch/powerpc/platforms/pseries/plpar_wrappers.h
index a05f8d427856..6c4fd2c3f385 100644
--- a/arch/powerpc/platforms/pseries/plpar_wrappers.h
+++ b/arch/powerpc/platforms/pseries/plpar_wrappers.h
@@ -4,6 +4,14 @@
 #include <asm/hvcall.h>
 #include <asm/page.h>
 
+/* Get state of physical CPU from query_cpu_stopped */
+int smp_query_cpu_stopped(unsigned int pcpu);
+#define QCSS_STOPPED 0
+#define QCSS_STOPPING 1
+#define QCSS_NOT_STOPPED 2
+#define QCSS_HARDWARE_ERROR -1
+#define QCSS_HARDWARE_BUSY -2
+
 static inline long poll_pending(void)
 {
         return plpar_hcall_norets(H_POLL_PENDING);
diff --git a/arch/powerpc/platforms/pseries/smp.c b/arch/powerpc/platforms/pseries/smp.c
index 4e7f89a84561..20b694280a66 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
  *