[PATCH v5 11/11] powerpc/powernv: Use deepest stop state when cpu is offlined

[Shreyas B. Prabhu]

If hardware supports stop state, use the deepest stop state when
the cpu is offlined.

Reviewed-by: Gautham R. Shenoy <e...@linux.vnet.ibm.com>
Signed-off-by: Shreyas B. Prabhu <shre...@linux.vnet.ibm.com>
---
 - No changes since v1

 arch/powerpc/platforms/powernv/idle.c    | 15 +++++++++++++--
 arch/powerpc/platforms/powernv/powernv.h |  1 +
 arch/powerpc/platforms/powernv/smp.c     |  4 +++-
 3 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/idle.c 
b/arch/powerpc/platforms/powernv/idle.c
index bfbd359..b38cb33 100644
--- a/arch/powerpc/platforms/powernv/idle.c
+++ b/arch/powerpc/platforms/powernv/idle.c
@@ -242,6 +242,11 @@ static DEVICE_ATTR(fastsleep_workaround_applyonce, 0600,
  */
 u64 pnv_first_deep_stop_state;
 
+/*
+ * Deepest stop idle state. Used when a cpu is offlined
+ */
+u64 pnv_deepest_stop_state;
+
 static int __init pnv_init_idle_states(void)
 {
        struct device_node *power_mgt;
@@ -290,8 +295,11 @@ static int __init pnv_init_idle_states(void)
                }
 
                /*
-                * Set pnv_first_deep_stop_state to the first stop level
-                * to cause hypervisor state loss
+                * Set pnv_first_deep_stop_state and pnv_deepest_stop_state.
+                * pnv_first_deep_stop_state should be set to the first stop
+                * level to cause hypervisor state loss.
+                * pnv_deepest_stop_state should be set to the deepest stop
+                * stop state.
                 */
                pnv_first_deep_stop_state = MAX_STOP_STATE;
                for (i = 0; i < dt_idle_states; i++) {
@@ -300,6 +308,9 @@ static int __init pnv_init_idle_states(void)
                        if ((flags[i] & OPAL_PM_LOSE_FULL_CONTEXT) &&
                             (pnv_first_deep_stop_state > psscr_rl))
                                pnv_first_deep_stop_state = psscr_rl;
+
+                       if (pnv_deepest_stop_state < psscr_rl)
+                               pnv_deepest_stop_state = psscr_rl;
                }
        }
 
diff --git a/arch/powerpc/platforms/powernv/powernv.h 
b/arch/powerpc/platforms/powernv/powernv.h
index 6dbc0a1..da7c843 100644
--- a/arch/powerpc/platforms/powernv/powernv.h
+++ b/arch/powerpc/platforms/powernv/powernv.h
@@ -18,6 +18,7 @@ static inline void pnv_pci_shutdown(void) { }
 #endif
 
 extern u32 pnv_get_supported_cpuidle_states(void);
+extern u64 pnv_deepest_stop_state;
 
 extern void pnv_lpc_init(void);
 
diff --git a/arch/powerpc/platforms/powernv/smp.c 
b/arch/powerpc/platforms/powernv/smp.c
index ad7b1a3..f69ceb6 100644
--- a/arch/powerpc/platforms/powernv/smp.c
+++ b/arch/powerpc/platforms/powernv/smp.c
@@ -182,7 +182,9 @@ static void pnv_smp_cpu_kill_self(void)
 
                ppc64_runlatch_off();
 
-               if (idle_states & OPAL_PM_WINKLE_ENABLED)
+               if (cpu_has_feature(CPU_FTR_ARCH_300))
+                       srr1 = power_stop(pnv_deepest_stop_state);
+               else if (idle_states & OPAL_PM_WINKLE_ENABLED)
                        srr1 = power7_winkle();
                else if ((idle_states & OPAL_PM_SLEEP_ENABLED) ||
                                (idle_states & OPAL_PM_SLEEP_ENABLED_ER1))
-- 
2.1.4