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-rw-r--r--arch/powerpc/platforms/Kconfig6
-rw-r--r--arch/powerpc/platforms/pseries/setup.c101
-rw-r--r--include/linux/cpuidle.h2
3 files changed, 23 insertions, 86 deletions
diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig
index 3fe6d927ad70..31e1adeaa92a 100644
--- a/arch/powerpc/platforms/Kconfig
+++ b/arch/powerpc/platforms/Kconfig
@@ -211,6 +211,12 @@ config PPC_PASEMI_CPUFREQ
endmenu
+menu "CPUIdle driver"
+
+source "drivers/cpuidle/Kconfig"
+
+endmenu
+
config PPC601_SYNC_FIX
bool "Workarounds for PPC601 bugs"
depends on 6xx && (PPC_PREP || PPC_PMAC)
diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index f2446da7f2d5..164839cb9fcd 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -39,6 +39,7 @@
#include <linux/irq.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
+#include <linux/cpuidle.h>
#include <asm/mmu.h>
#include <asm/processor.h>
@@ -74,9 +75,6 @@ EXPORT_SYMBOL(CMO_PageSize);
int fwnmi_active; /* TRUE if an FWNMI handler is present */
-static void pseries_shared_idle_sleep(void);
-static void pseries_dedicated_idle_sleep(void);
-
static struct device_node *pSeries_mpic_node;
static void pSeries_show_cpuinfo(struct seq_file *m)
@@ -351,6 +349,21 @@ static int alloc_dispatch_log_kmem_cache(void)
}
early_initcall(alloc_dispatch_log_kmem_cache);
+static void pSeries_idle(void)
+{
+ /* This would call on the cpuidle framework, and the back-end pseries
+ * driver to go to idle states
+ */
+ if (cpuidle_idle_call()) {
+ /* On error, execute default handler
+ * to go into low thread priority and possibly
+ * low power mode.
+ */
+ HMT_low();
+ HMT_very_low();
+ }
+}
+
static void __init pSeries_setup_arch(void)
{
/* Discover PIC type and setup ppc_md accordingly */
@@ -373,18 +386,9 @@ static void __init pSeries_setup_arch(void)
pSeries_nvram_init();
- /* Choose an idle loop */
if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
vpa_init(boot_cpuid);
- if (get_lppaca()->shared_proc) {
- printk(KERN_DEBUG "Using shared processor idle loop\n");
- ppc_md.power_save = pseries_shared_idle_sleep;
- } else {
- printk(KERN_DEBUG "Using dedicated idle loop\n");
- ppc_md.power_save = pseries_dedicated_idle_sleep;
- }
- } else {
- printk(KERN_DEBUG "Using default idle loop\n");
+ ppc_md.power_save = pSeries_idle;
}
if (firmware_has_feature(FW_FEATURE_LPAR))
@@ -585,77 +589,6 @@ static int __init pSeries_probe(void)
return 1;
}
-static void pseries_dedicated_idle_sleep(void)
-{
- unsigned int cpu = smp_processor_id();
- unsigned long start_snooze;
- unsigned long in_purr, out_purr;
- long snooze = __get_cpu_var(smt_snooze_delay);
-
- /*
- * Indicate to the HV that we are idle. Now would be
- * a good time to find other work to dispatch.
- */
- get_lppaca()->idle = 1;
- get_lppaca()->donate_dedicated_cpu = 1;
- in_purr = mfspr(SPRN_PURR);
-
- /*
- * We come in with interrupts disabled, and need_resched()
- * has been checked recently. If we should poll for a little
- * while, do so.
- */
- if (snooze) {
- start_snooze = get_tb() + snooze * tb_ticks_per_usec;
- local_irq_enable();
- set_thread_flag(TIF_POLLING_NRFLAG);
-
- while ((snooze < 0) || (get_tb() < start_snooze)) {
- if (need_resched() || cpu_is_offline(cpu))
- goto out;
- ppc64_runlatch_off();
- HMT_low();
- HMT_very_low();
- }
-
- HMT_medium();
- clear_thread_flag(TIF_POLLING_NRFLAG);
- smp_mb();
- local_irq_disable();
- if (need_resched() || cpu_is_offline(cpu))
- goto out;
- }
-
- cede_processor();
-
-out:
- HMT_medium();
- out_purr = mfspr(SPRN_PURR);
- get_lppaca()->wait_state_cycles += out_purr - in_purr;
- get_lppaca()->donate_dedicated_cpu = 0;
- get_lppaca()->idle = 0;
-}
-
-static void pseries_shared_idle_sleep(void)
-{
- /*
- * Indicate to the HV that we are idle. Now would be
- * a good time to find other work to dispatch.
- */
- get_lppaca()->idle = 1;
-
- /*
- * Yield the processor to the hypervisor. We return if
- * an external interrupt occurs (which are driven prior
- * to returning here) or if a prod occurs from another
- * processor. When returning here, external interrupts
- * are enabled.
- */
- cede_processor();
-
- get_lppaca()->idle = 0;
-}
-
static int pSeries_pci_probe_mode(struct pci_bus *bus)
{
if (firmware_has_feature(FW_FEATURE_LPAR))
diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index 7408af843b8a..23f81de51829 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -130,7 +130,6 @@ struct cpuidle_driver {
#ifdef CONFIG_CPU_IDLE
extern void disable_cpuidle(void);
extern int cpuidle_idle_call(void);
-
extern int cpuidle_register_driver(struct cpuidle_driver *drv);
struct cpuidle_driver *cpuidle_get_driver(void);
extern void cpuidle_unregister_driver(struct cpuidle_driver *drv);
@@ -145,7 +144,6 @@ extern void cpuidle_disable_device(struct cpuidle_device *dev);
#else
static inline void disable_cpuidle(void) { }
static inline int cpuidle_idle_call(void) { return -ENODEV; }
-
static inline int cpuidle_register_driver(struct cpuidle_driver *drv)
{return -ENODEV; }
static inline struct cpuidle_driver *cpuidle_get_driver(void) {return NULL; }