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Merge branch 'idle-release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6

Browse source 
* 'idle-release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6:
  intel_idle: recognize Lincroft Atom Processor
  intel_idle: no longer EXPERIMENTAL
  intel_idle: disable module support
  intel_idle: add support for Westmere-EX
  intel_idle: delete power_policy modparam, and choose substate functions
  intel_idle: delete substates DEBUG modparam
This commit is contained in:
Linus Torvalds 2010-08-15 11:17:52 -07:00
commit 5a4179460c
2 changed files with 8 additions and 56 deletions
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3
drivers/idle/Kconfig
View file

@ -1,9 +1,8 @@
config INTEL_IDLE
tristate "Cpuidle Driver for Intel Processors"
bool "Cpuidle Driver for Intel Processors"
depends on CPU_IDLE
depends on X86
depends on CPU_SUP_INTEL
depends on EXPERIMENTAL
help
Enable intel_idle, a cpuidle driver that includes knowledge of
native Intel hardware idle features. The acpi_idle driver

61
drivers/idle/intel_idle.c
View file

@ -77,10 +77,8 @@ static struct cpuidle_driver intel_idle_driver = {
};
/* intel_idle.max_cstate=0 disables driver */
static int max_cstate = MWAIT_MAX_NUM_CSTATES - 1;
static int power_policy = 7; /* 0 = max perf; 15 = max powersave */
static unsigned int substates;
static int (*choose_substate)(int);
static unsigned int mwait_substates;
/* Reliable LAPIC Timer States, bit 1 for C1 etc. */
static unsigned int lapic_timer_reliable_states;
@ -168,41 +166,6 @@ static struct cpuidle_state atom_cstates[MWAIT_MAX_NUM_CSTATES] = {
.enter = NULL }, /* disabled */
};
/*
* choose_tunable_substate()
*
* Run-time decision on which C-state substate to invoke
* If power_policy = 0, choose shallowest substate (0)
* If power_policy = 15, choose deepest substate
* If power_policy = middle, choose middle substate etc.
*/
static int choose_tunable_substate(int cstate)
{
unsigned int num_substates;
unsigned int substate_choice;
power_policy &= 0xF; /* valid range: 0-15 */
cstate &= 7; /* valid range: 0-7 */
num_substates = (substates >> ((cstate) * 4)) & MWAIT_SUBSTATE_MASK;
if (num_substates <= 1)
return 0;
substate_choice = ((power_policy + (power_policy + 1) *
(num_substates - 1)) / 16);
return substate_choice;
}
/*
* choose_zero_substate()
*/
static int choose_zero_substate(int cstate)
{
return 0;
}
/**
* intel_idle
* @dev: cpuidle_device
@ -220,8 +183,6 @@ static int intel_idle(struct cpuidle_device *dev, struct cpuidle_state *state)
cstate = (((eax) >> MWAIT_SUBSTATE_SIZE) & MWAIT_CSTATE_MASK) + 1;
eax = eax + (choose_substate)(cstate);
local_irq_disable();
if (!(lapic_timer_reliable_states & (1 << (cstate))))
@ -259,7 +220,7 @@ static int intel_idle(struct cpuidle_device *dev, struct cpuidle_state *state)
*/
static int intel_idle_probe(void)
{
unsigned int eax, ebx, ecx, edx;
unsigned int eax, ebx, ecx;
if (max_cstate == 0) {
pr_debug(PREFIX "disabled\n");
@ -275,17 +236,13 @@ static int intel_idle_probe(void)
if (boot_cpu_data.cpuid_level < CPUID_MWAIT_LEAF)
return -ENODEV;
cpuid(CPUID_MWAIT_LEAF, &eax, &ebx, &ecx, &edx);
cpuid(CPUID_MWAIT_LEAF, &eax, &ebx, &ecx, &mwait_substates);
if (!(ecx & CPUID5_ECX_EXTENSIONS_SUPPORTED) ||
!(ecx & CPUID5_ECX_INTERRUPT_BREAK))
return -ENODEV;
#ifdef DEBUG
if (substates == 0) /* can over-ride via modparam */
#endif
substates = edx;
pr_debug(PREFIX "MWAIT substates: 0x%x\n", substates);
pr_debug(PREFIX "MWAIT substates: 0x%x\n", mwait_substates);
if (boot_cpu_has(X86_FEATURE_ARAT)) /* Always Reliable APIC Timer */
lapic_timer_reliable_states = 0xFFFFFFFF;
@ -299,18 +256,18 @@ static int intel_idle_probe(void)
case 0x1E: /* Core i7 and i5 Processor - Lynnfield Jasper Forest */
case 0x1F: /* Core i7 and i5 Processor - Nehalem */
case 0x2E: /* Nehalem-EX Xeon */
case 0x2F: /* Westmere-EX Xeon */
lapic_timer_reliable_states = (1 << 1); /* C1 */
case 0x25: /* Westmere */
case 0x2C: /* Westmere */
cpuidle_state_table = nehalem_cstates;
choose_substate = choose_tunable_substate;
break;
case 0x1C: /* 28 - Atom Processor */
case 0x26: /* 38 - Lincroft Atom Processor */
lapic_timer_reliable_states = (1 << 2) | (1 << 1); /* C2, C1 */
cpuidle_state_table = atom_cstates;
choose_substate = choose_zero_substate;
break;
#ifdef FUTURE_USE
case 0x17: /* 23 - Core 2 Duo */
@ -376,7 +333,7 @@ static int intel_idle_cpuidle_devices_init(void)
}
/* does the state exist in CPUID.MWAIT? */
num_substates = (substates >> ((cstate) * 4))
num_substates = (mwait_substates >> ((cstate) * 4))
& MWAIT_SUBSTATE_MASK;
if (num_substates == 0)
continue;
@ -450,11 +407,7 @@ static void __exit intel_idle_exit(void)
module_init(intel_idle_init);
module_exit(intel_idle_exit);
module_param(power_policy, int, 0644);
module_param(max_cstate, int, 0444);
#ifdef DEBUG
module_param(substates, int, 0444);
#endif
MODULE_AUTHOR("Len Brown <len.brown@intel.com>");
MODULE_DESCRIPTION("Cpuidle driver for Intel Hardware v" INTEL_IDLE_VERSION);