diff options
Diffstat (limited to 'drivers/idle/intel_idle.c')
| -rw-r--r--[-rwxr-xr-x] | drivers/idle/intel_idle.c | 39 |
1 files changed, 21 insertions, 18 deletions
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index a10152bb142..cb3ccf3ed22 100755..100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -59,18 +59,11 @@ #include <linux/hrtimer.h> /* ktime_get_real() */ #include <trace/events/power.h> #include <linux/sched.h> +#include <asm/mwait.h> #define INTEL_IDLE_VERSION "0.4" #define PREFIX "intel_idle: " -#define MWAIT_SUBSTATE_MASK (0xf) -#define MWAIT_CSTATE_MASK (0xf) -#define MWAIT_SUBSTATE_SIZE (4) -#define MWAIT_MAX_NUM_CSTATES 8 -#define CPUID_MWAIT_LEAF (5) -#define CPUID5_ECX_EXTENSIONS_SUPPORTED (0x1) -#define CPUID5_ECX_INTERRUPT_BREAK (0x2) - static struct cpuidle_driver intel_idle_driver = { .name = "intel_idle", .owner = THIS_MODULE, @@ -83,7 +76,7 @@ static unsigned int mwait_substates; /* Reliable LAPIC Timer States, bit 1 for C1 etc. */ static unsigned int lapic_timer_reliable_states; -static struct cpuidle_device *intel_idle_cpuidle_devices; +static struct cpuidle_device __percpu *intel_idle_cpuidle_devices; static int intel_idle(struct cpuidle_device *dev, struct cpuidle_state *state); static struct cpuidle_state *cpuidle_state_table; @@ -108,7 +101,7 @@ static struct cpuidle_state nehalem_cstates[MWAIT_MAX_NUM_CSTATES] = { .name = "NHM-C3", .desc = "MWAIT 0x10", .driver_data = (void *) 0x10, - .flags = CPUIDLE_FLAG_TIME_VALID, + .flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 20, .power_usage = 500, .target_residency = 80, @@ -117,7 +110,7 @@ static struct cpuidle_state nehalem_cstates[MWAIT_MAX_NUM_CSTATES] = { .name = "NHM-C6", .desc = "MWAIT 0x20", .driver_data = (void *) 0x20, - .flags = CPUIDLE_FLAG_TIME_VALID, + .flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 200, .power_usage = 350, .target_residency = 800, @@ -149,7 +142,7 @@ static struct cpuidle_state atom_cstates[MWAIT_MAX_NUM_CSTATES] = { .name = "ATM-C4", .desc = "MWAIT 0x30", .driver_data = (void *) 0x30, - .flags = CPUIDLE_FLAG_TIME_VALID, + .flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 100, .power_usage = 250, .target_residency = 400, @@ -157,13 +150,13 @@ static struct cpuidle_state atom_cstates[MWAIT_MAX_NUM_CSTATES] = { { /* MWAIT C5 */ }, { /* MWAIT C6 */ .name = "ATM-C6", - .desc = "MWAIT 0x40", - .driver_data = (void *) 0x40, - .flags = CPUIDLE_FLAG_TIME_VALID, - .exit_latency = 200, + .desc = "MWAIT 0x52", + .driver_data = (void *) 0x52, + .flags = CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TLB_FLUSHED, + .exit_latency = 140, .power_usage = 150, - .target_residency = 800, - .enter = NULL }, /* disabled */ + .target_residency = 560, + .enter = &intel_idle }, }; /** @@ -185,6 +178,16 @@ static int intel_idle(struct cpuidle_device *dev, struct cpuidle_state *state) local_irq_disable(); + /* + * If the state flag indicates that the TLB will be flushed or if this + * is the deepest c-state supported, do a voluntary leave mm to avoid + * costly and mostly unnecessary wakeups for flushing the user TLB's + * associated with the active mm. + */ + if (state->flags & CPUIDLE_FLAG_TLB_FLUSHED || + (&dev->states[dev->state_count - 1] == state)) + leave_mm(cpu); + if (!(lapic_timer_reliable_states & (1 << (cstate)))) clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &cpu); |