summaryrefslogtreecommitdiff
path: root/drivers/idle
diff options
context:
space:
mode:
authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-11-13 03:34:14 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-11-13 03:34:14 +0300
commit622ade3a2ff0fc4c026f116ea6018eddaeb49925 (patch)
tree44d62d3929632a0f1a802decc6b1f1f680ce658f /drivers/idle
parent4762573b934cced83b91950f0e7a9f160e3983e3 (diff)
parenta4c447533a18ee86e07232d6344ba12b1f9c5077 (diff)
downloadlinux-622ade3a2ff0fc4c026f116ea6018eddaeb49925.tar.xz
Merge branch 'pm-cpuidle'
* pm-cpuidle: intel_idle: Graceful probe failure when MWAIT is disabled cpuidle: Avoid assignment in if () argument cpuidle: Clean up cpuidle_enable_device() error handling a bit cpuidle: ladder: Add per CPU PM QoS resume latency support ARM: cpuidle: Refactor rollback operations if init fails ARM: cpuidle: Correct driver unregistration if init fails intel_idle: replace conditionals with static_cpu_has(X86_FEATURE_ARAT) cpuidle: fix broadcast control when broadcast can not be entered Conflicts: drivers/idle/intel_idle.c
Diffstat (limited to 'drivers/idle')
-rw-r--r--drivers/idle/intel_idle.c23
1 files changed, 17 insertions, 6 deletions
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index f0b06b14e782..b2ccce5fb071 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -913,10 +913,9 @@ static __cpuidle int intel_idle(struct cpuidle_device *dev,
struct cpuidle_state *state = &drv->states[index];
unsigned long eax = flg2MWAIT(state->flags);
unsigned int cstate;
+ bool uninitialized_var(tick);
int cpu = smp_processor_id();
- cstate = (((eax) >> MWAIT_SUBSTATE_SIZE) & MWAIT_CSTATE_MASK) + 1;
-
/*
* leave_mm() to avoid costly and often unnecessary wakeups
* for flushing the user TLB's associated with the active mm.
@@ -924,12 +923,19 @@ static __cpuidle int intel_idle(struct cpuidle_device *dev,
if (state->flags & CPUIDLE_FLAG_TLB_FLUSHED)
leave_mm(cpu);
- if (!(lapic_timer_reliable_states & (1 << (cstate))))
- tick_broadcast_enter();
+ if (!static_cpu_has(X86_FEATURE_ARAT)) {
+ cstate = (((eax) >> MWAIT_SUBSTATE_SIZE) &
+ MWAIT_CSTATE_MASK) + 1;
+ tick = false;
+ if (!(lapic_timer_reliable_states & (1 << (cstate)))) {
+ tick = true;
+ tick_broadcast_enter();
+ }
+ }
mwait_idle_with_hints(eax, ecx);
- if (!(lapic_timer_reliable_states & (1 << (cstate))))
+ if (!static_cpu_has(X86_FEATURE_ARAT) && tick)
tick_broadcast_exit();
return index;
@@ -1061,7 +1067,7 @@ static const struct idle_cpu idle_cpu_dnv = {
};
#define ICPU(model, cpu) \
- { X86_VENDOR_INTEL, 6, model, X86_FEATURE_MWAIT, (unsigned long)&cpu }
+ { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, (unsigned long)&cpu }
static const struct x86_cpu_id intel_idle_ids[] __initconst = {
ICPU(INTEL_FAM6_NEHALEM_EP, idle_cpu_nehalem),
@@ -1125,6 +1131,11 @@ static int __init intel_idle_probe(void)
return -ENODEV;
}
+ if (!boot_cpu_has(X86_FEATURE_MWAIT)) {
+ pr_debug("Please enable MWAIT in BIOS SETUP\n");
+ return -ENODEV;
+ }
+
if (boot_cpu_data.cpuid_level < CPUID_MWAIT_LEAF)
return -ENODEV;