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author | Thomas Renninger <trenn@suse.de> | 2012-01-17 22:40:08 +0100 |
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committer | Len Brown <len.brown@intel.com> | 2012-01-17 23:59:12 -0500 |
commit | 65b7f839ceecc0a36c7969c0c9151d5748cd4242 (patch) | |
tree | fd98dd21fafcbeec668bbc2e61812b65bee7919e /drivers | |
parent | 3bd81a8710710f8bf5d1a5ebac315c842c20bdd3 (diff) | |
download | linux-3.10-65b7f839ceecc0a36c7969c0c9151d5748cd4242.tar.gz linux-3.10-65b7f839ceecc0a36c7969c0c9151d5748cd4242.tar.bz2 linux-3.10-65b7f839ceecc0a36c7969c0c9151d5748cd4242.zip |
intel_idle: Split up and provide per CPU initialization func
Function split up, should have no functional change.
Provides entry point for physically hotplugged CPUs
to initialize and activate cpuidle.
Signed-off-by: Thomas Renninger <trenn@suse.de>
CC: Deepthi Dharwar <deepthi@linux.vnet.ibm.com>
CC: Shaohua Li <shaohua.li@intel.com>
CC: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/idle/intel_idle.c | 82 |
1 files changed, 42 insertions, 40 deletions
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index 5d2f8e13cf0..ef0c04d8dc2 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -478,64 +478,60 @@ static int intel_idle_cpuidle_driver_init(void) /* - * intel_idle_cpuidle_devices_init() + * intel_idle_cpu_init() * allocate, initialize, register cpuidle_devices + * @cpu: cpu/core to initialize */ -static int intel_idle_cpuidle_devices_init(void) +int intel_idle_cpu_init(int cpu) { - int i, cstate; + int cstate; struct cpuidle_device *dev; - intel_idle_cpuidle_devices = alloc_percpu(struct cpuidle_device); - if (intel_idle_cpuidle_devices == NULL) - return -ENOMEM; - - for_each_online_cpu(i) { - dev = per_cpu_ptr(intel_idle_cpuidle_devices, i); + dev = per_cpu_ptr(intel_idle_cpuidle_devices, cpu); - dev->state_count = 1; + dev->state_count = 1; - for (cstate = 1; cstate < MWAIT_MAX_NUM_CSTATES; ++cstate) { - int num_substates; + for (cstate = 1; cstate < MWAIT_MAX_NUM_CSTATES; ++cstate) { + int num_substates; - if (cstate > max_cstate) { - printk(PREFIX "max_cstate %d reached\n", - max_cstate); - break; - } + if (cstate > max_cstate) { + printk(PREFIX "max_cstate %d reached\n", + max_cstate); + break; + } - /* does the state exist in CPUID.MWAIT? */ - num_substates = (mwait_substates >> ((cstate) * 4)) - & MWAIT_SUBSTATE_MASK; - if (num_substates == 0) - continue; - /* is the state not enabled? */ - if (cpuidle_state_table[cstate].enter == NULL) { - continue; - } + /* does the state exist in CPUID.MWAIT? */ + num_substates = (mwait_substates >> ((cstate) * 4)) + & MWAIT_SUBSTATE_MASK; + if (num_substates == 0) + continue; + /* is the state not enabled? */ + if (cpuidle_state_table[cstate].enter == NULL) + continue; - dev->states_usage[dev->state_count].driver_data = - (void *)get_driver_data(cstate); + dev->states_usage[dev->state_count].driver_data = + (void *)get_driver_data(cstate); dev->state_count += 1; } + dev->cpu = cpu; - dev->cpu = i; - if (cpuidle_register_device(dev)) { - pr_debug(PREFIX "cpuidle_register_device %d failed!\n", - i); - intel_idle_cpuidle_devices_uninit(); - return -EIO; - } + if (cpuidle_register_device(dev)) { + pr_debug(PREFIX "cpuidle_register_device %d failed!\n", cpu); + intel_idle_cpuidle_devices_uninit(); + return -EIO; } + if (auto_demotion_disable_flags) + smp_call_function_single(cpu, auto_demotion_disable, NULL, 1); + return 0; } static int __init intel_idle_init(void) { - int retval; + int retval, i; /* Do not load intel_idle at all for now if idle= is passed */ if (boot_option_idle_override != IDLE_NO_OVERRIDE) @@ -553,10 +549,16 @@ static int __init intel_idle_init(void) return retval; } - retval = intel_idle_cpuidle_devices_init(); - if (retval) { - cpuidle_unregister_driver(&intel_idle_driver); - return retval; + intel_idle_cpuidle_devices = alloc_percpu(struct cpuidle_device); + if (intel_idle_cpuidle_devices == NULL) + return -ENOMEM; + + for_each_online_cpu(i) { + retval = intel_idle_cpu_init(i); + if (retval) { + cpuidle_unregister_driver(&intel_idle_driver); + return retval; + } } return 0; |