[079/200] powerpc/pseries: Make query_cpu_stopped callable outside hotplug cpu

Greg KH
2010-07-01T21:50:31Z

2.6.34-stable review patch. If anyone has any objections, please let me know.

------------------

From: Michael Neuling <mikey@neuling.org>

commit f8b67691828321f5c85bb853283aa101ae673130 upstream.

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

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
arch/powerpc/platforms/pseries/hotplug-cpu.c | 30 +++---------------------
arch/powerpc/platforms/pseries/plpar_wrappers.h | 8 ++++++
arch/powerpc/platforms/pseries/smp.c | 22 +++++++++++++++++
3 files changed, 34 insertions(+), 26 deletions(-)

--- 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
} 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_in
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);
--- 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);
--- 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
*