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powerpc/powernv: Use deepest stop state when cpu is offlined 

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

Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Shreyas B. Prabhu <shreyas@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Shreyas B. Prabhu 2016-07-08 11:50:53 +05:30 committed by Michael Ellerman
parent 3005c597ba
commit c0691f9dd2
3 changed files with 17 additions and 3 deletions
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15
arch/powerpc/platforms/powernv/idle.c
View File

@ -252,6 +252,11 @@ static void power9_idle(void)
*/
u64 pnv_first_deep_stop_state = MAX_STOP_STATE;
/*
* Deepest stop idle state. Used when a cpu is offlined
*/
u64 pnv_deepest_stop_state;
/*
* Power ISA 3.0 idle initialization.
*
@ -314,8 +319,11 @@ static int __init pnv_arch300_idle_init(struct device_node *np, u32 *flags,
}
/*
* 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++) {
@ -324,6 +332,9 @@ static int __init pnv_arch300_idle_init(struct device_node *np, u32 *flags,
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;
}
out:

1
arch/powerpc/platforms/powernv/powernv.h
View File

@ -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);

4
arch/powerpc/platforms/powernv/smp.c
View File

@ -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 = power9_idle_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))