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| author | Shreyas B. Prabhu | 2016-07-08 08:20:53 +0200 |
|---|---|---|
| committer | Michael Ellerman | 2016-07-15 12:18:42 +0200 |
| commit | c0691f9dd2066087524d2b4498c0c9331f26dcd5 (patch) | |
| tree | 9e6118afab0c2abeffee5574480c98d9ee25f0f1 /arch/powerpc/platforms | |
| parent | cpuidle/powernv: Add support for POWER ISA v3 idle states (diff) | |
| download | kernel-qcow2-linux-c0691f9dd2066087524d2b4498c0c9331f26dcd5.tar.gz kernel-qcow2-linux-c0691f9dd2066087524d2b4498c0c9331f26dcd5.tar.xz kernel-qcow2-linux-c0691f9dd2066087524d2b4498c0c9331f26dcd5.zip | |
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>
Diffstat (limited to 'arch/powerpc/platforms')
| -rw-r--r-- | arch/powerpc/platforms/powernv/idle.c | 15 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/powernv.h | 1 | ||||
| -rw-r--r-- | 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 8219e22c2b91..479c25601612 100644 --- a/arch/powerpc/platforms/powernv/idle.c +++ b/arch/powerpc/platforms/powernv/idle.c @@ -253,6 +253,11 @@ 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. * * POWER ISA 3.0 defines a new SPR Processor stop Status and Control @@ -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: diff --git a/arch/powerpc/platforms/powernv/powernv.h b/arch/powerpc/platforms/powernv/powernv.h index 6dbc0a1da1f6..da7c843ac7f1 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 ad7b1a3dbed0..c789258ae1e1 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 = 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)) |