Merge branch 'idle-release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6
* '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
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commit
5a4179460c
2 changed files with 8 additions and 56 deletions
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@ -1,9 +1,8 @@
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config INTEL_IDLE
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tristate "Cpuidle Driver for Intel Processors"
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bool "Cpuidle Driver for Intel Processors"
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depends on CPU_IDLE
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depends on X86
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depends on CPU_SUP_INTEL
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depends on EXPERIMENTAL
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help
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Enable intel_idle, a cpuidle driver that includes knowledge of
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native Intel hardware idle features. The acpi_idle driver
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@ -77,10 +77,8 @@ static struct cpuidle_driver intel_idle_driver = {
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};
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/* intel_idle.max_cstate=0 disables driver */
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static int max_cstate = MWAIT_MAX_NUM_CSTATES - 1;
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static int power_policy = 7; /* 0 = max perf; 15 = max powersave */
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static unsigned int substates;
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static int (*choose_substate)(int);
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static unsigned int mwait_substates;
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/* Reliable LAPIC Timer States, bit 1 for C1 etc. */
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static unsigned int lapic_timer_reliable_states;
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@ -168,41 +166,6 @@ static struct cpuidle_state atom_cstates[MWAIT_MAX_NUM_CSTATES] = {
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.enter = NULL }, /* disabled */
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};
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/*
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* choose_tunable_substate()
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*
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* Run-time decision on which C-state substate to invoke
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* If power_policy = 0, choose shallowest substate (0)
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* If power_policy = 15, choose deepest substate
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* If power_policy = middle, choose middle substate etc.
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*/
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static int choose_tunable_substate(int cstate)
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{
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unsigned int num_substates;
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unsigned int substate_choice;
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power_policy &= 0xF; /* valid range: 0-15 */
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cstate &= 7; /* valid range: 0-7 */
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num_substates = (substates >> ((cstate) * 4)) & MWAIT_SUBSTATE_MASK;
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if (num_substates <= 1)
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return 0;
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substate_choice = ((power_policy + (power_policy + 1) *
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(num_substates - 1)) / 16);
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return substate_choice;
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}
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/*
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* choose_zero_substate()
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*/
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static int choose_zero_substate(int cstate)
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{
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return 0;
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}
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/**
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* intel_idle
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* @dev: cpuidle_device
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@ -220,8 +183,6 @@ static int intel_idle(struct cpuidle_device *dev, struct cpuidle_state *state)
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cstate = (((eax) >> MWAIT_SUBSTATE_SIZE) & MWAIT_CSTATE_MASK) + 1;
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eax = eax + (choose_substate)(cstate);
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local_irq_disable();
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if (!(lapic_timer_reliable_states & (1 << (cstate))))
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@ -259,7 +220,7 @@ static int intel_idle(struct cpuidle_device *dev, struct cpuidle_state *state)
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*/
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static int intel_idle_probe(void)
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{
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unsigned int eax, ebx, ecx, edx;
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unsigned int eax, ebx, ecx;
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if (max_cstate == 0) {
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pr_debug(PREFIX "disabled\n");
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@ -275,17 +236,13 @@ static int intel_idle_probe(void)
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if (boot_cpu_data.cpuid_level < CPUID_MWAIT_LEAF)
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return -ENODEV;
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cpuid(CPUID_MWAIT_LEAF, &eax, &ebx, &ecx, &edx);
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cpuid(CPUID_MWAIT_LEAF, &eax, &ebx, &ecx, &mwait_substates);
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if (!(ecx & CPUID5_ECX_EXTENSIONS_SUPPORTED) ||
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!(ecx & CPUID5_ECX_INTERRUPT_BREAK))
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return -ENODEV;
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#ifdef DEBUG
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if (substates == 0) /* can over-ride via modparam */
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#endif
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substates = edx;
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pr_debug(PREFIX "MWAIT substates: 0x%x\n", substates);
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pr_debug(PREFIX "MWAIT substates: 0x%x\n", mwait_substates);
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if (boot_cpu_has(X86_FEATURE_ARAT)) /* Always Reliable APIC Timer */
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lapic_timer_reliable_states = 0xFFFFFFFF;
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@ -299,18 +256,18 @@ static int intel_idle_probe(void)
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case 0x1E: /* Core i7 and i5 Processor - Lynnfield Jasper Forest */
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case 0x1F: /* Core i7 and i5 Processor - Nehalem */
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case 0x2E: /* Nehalem-EX Xeon */
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case 0x2F: /* Westmere-EX Xeon */
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lapic_timer_reliable_states = (1 << 1); /* C1 */
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case 0x25: /* Westmere */
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case 0x2C: /* Westmere */
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cpuidle_state_table = nehalem_cstates;
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choose_substate = choose_tunable_substate;
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break;
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case 0x1C: /* 28 - Atom Processor */
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case 0x26: /* 38 - Lincroft Atom Processor */
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lapic_timer_reliable_states = (1 << 2) | (1 << 1); /* C2, C1 */
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cpuidle_state_table = atom_cstates;
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choose_substate = choose_zero_substate;
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break;
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#ifdef FUTURE_USE
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case 0x17: /* 23 - Core 2 Duo */
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@ -376,7 +333,7 @@ static int intel_idle_cpuidle_devices_init(void)
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}
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/* does the state exist in CPUID.MWAIT? */
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num_substates = (substates >> ((cstate) * 4))
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num_substates = (mwait_substates >> ((cstate) * 4))
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& MWAIT_SUBSTATE_MASK;
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if (num_substates == 0)
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continue;
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@ -450,11 +407,7 @@ static void __exit intel_idle_exit(void)
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module_init(intel_idle_init);
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module_exit(intel_idle_exit);
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module_param(power_policy, int, 0644);
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module_param(max_cstate, int, 0444);
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#ifdef DEBUG
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module_param(substates, int, 0444);
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#endif
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MODULE_AUTHOR("Len Brown <len.brown@intel.com>");
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MODULE_DESCRIPTION("Cpuidle driver for Intel Hardware v" INTEL_IDLE_VERSION);
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