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P-state software coordination for speedstep-centrino
http://bugzilla.kernel.org/show_bug.cgi?id=5737 Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Venkatesh Pallipadi
Len Brown
parent
09b4d1ee88
commit
c52851b60c
@ -351,7 +351,36 @@ static unsigned int get_cur_freq(unsigned int cpu)
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#ifdef CONFIG_X86_SPEEDSTEP_CENTRINO_ACPI
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static struct acpi_processor_performance p;
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static struct acpi_processor_performance *acpi_perf_data[NR_CPUS];
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/*
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* centrino_cpu_early_init_acpi - Do the preregistering with ACPI P-States
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* library
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*
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* Before doing the actual init, we need to do _PSD related setup whenever
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* supported by the BIOS. These are handled by this early_init routine.
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*/
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static int centrino_cpu_early_init_acpi(void)
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{
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unsigned int i, j;
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struct acpi_processor_performance *data;
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for_each_cpu(i) {
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data = kzalloc(sizeof(struct acpi_processor_performance),
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GFP_KERNEL);
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if (!data) {
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for_each_cpu(j) {
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kfree(acpi_perf_data[j]);
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acpi_perf_data[j] = NULL;
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}
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return (-ENOMEM);
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}
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acpi_perf_data[i] = data;
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}
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acpi_processor_preregister_performance(acpi_perf_data);
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return 0;
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}
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/*
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* centrino_cpu_init_acpi - register with ACPI P-States library
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@ -365,46 +394,51 @@ static int centrino_cpu_init_acpi(struct cpufreq_policy *policy)
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unsigned long cur_freq;
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int result = 0, i;
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unsigned int cpu = policy->cpu;
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struct acpi_processor_performance *p;
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p = acpi_perf_data[cpu];
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/* register with ACPI core */
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if (acpi_processor_register_performance(&p, cpu)) {
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if (acpi_processor_register_performance(p, cpu)) {
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dprintk(KERN_INFO PFX "obtaining ACPI data failed\n");
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return -EIO;
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}
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policy->cpus = p->shared_cpu_map;
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policy->shared_type = p->shared_type;
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/* verify the acpi_data */
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if (p.state_count <= 1) {
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if (p->state_count <= 1) {
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dprintk("No P-States\n");
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result = -ENODEV;
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goto err_unreg;
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}
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if ((p.control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
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(p.status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
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if ((p->control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
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(p->status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
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dprintk("Invalid control/status registers (%x - %x)\n",
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p.control_register.space_id, p.status_register.space_id);
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p->control_register.space_id, p->status_register.space_id);
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result = -EIO;
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goto err_unreg;
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}
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for (i=0; i<p.state_count; i++) {
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if (p.states[i].control != p.states[i].status) {
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for (i=0; i<p->state_count; i++) {
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if (p->states[i].control != p->states[i].status) {
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dprintk("Different control (%llu) and status values (%llu)\n",
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p.states[i].control, p.states[i].status);
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p->states[i].control, p->states[i].status);
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result = -EINVAL;
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goto err_unreg;
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}
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if (!p.states[i].core_frequency) {
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if (!p->states[i].core_frequency) {
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dprintk("Zero core frequency for state %u\n", i);
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result = -EINVAL;
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goto err_unreg;
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}
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if (p.states[i].core_frequency > p.states[0].core_frequency) {
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if (p->states[i].core_frequency > p->states[0].core_frequency) {
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dprintk("P%u has larger frequency (%llu) than P0 (%llu), skipping\n", i,
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p.states[i].core_frequency, p.states[0].core_frequency);
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p.states[i].core_frequency = 0;
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p->states[i].core_frequency, p->states[0].core_frequency);
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p->states[i].core_frequency = 0;
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continue;
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}
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}
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@ -416,26 +450,26 @@ static int centrino_cpu_init_acpi(struct cpufreq_policy *policy)
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}
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centrino_model[cpu]->model_name=NULL;
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centrino_model[cpu]->max_freq = p.states[0].core_frequency * 1000;
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centrino_model[cpu]->max_freq = p->states[0].core_frequency * 1000;
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centrino_model[cpu]->op_points = kmalloc(sizeof(struct cpufreq_frequency_table) *
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(p.state_count + 1), GFP_KERNEL);
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(p->state_count + 1), GFP_KERNEL);
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if (!centrino_model[cpu]->op_points) {
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result = -ENOMEM;
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goto err_kfree;
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}
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for (i=0; i<p.state_count; i++) {
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centrino_model[cpu]->op_points[i].index = p.states[i].control;
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centrino_model[cpu]->op_points[i].frequency = p.states[i].core_frequency * 1000;
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for (i=0; i<p->state_count; i++) {
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centrino_model[cpu]->op_points[i].index = p->states[i].control;
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centrino_model[cpu]->op_points[i].frequency = p->states[i].core_frequency * 1000;
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dprintk("adding state %i with frequency %u and control value %04x\n",
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i, centrino_model[cpu]->op_points[i].frequency, centrino_model[cpu]->op_points[i].index);
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}
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centrino_model[cpu]->op_points[p.state_count].frequency = CPUFREQ_TABLE_END;
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centrino_model[cpu]->op_points[p->state_count].frequency = CPUFREQ_TABLE_END;
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cur_freq = get_cur_freq(cpu);
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for (i=0; i<p.state_count; i++) {
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if (!p.states[i].core_frequency) {
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for (i=0; i<p->state_count; i++) {
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if (!p->states[i].core_frequency) {
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dprintk("skipping state %u\n", i);
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centrino_model[cpu]->op_points[i].frequency = CPUFREQ_ENTRY_INVALID;
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continue;
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@ -451,7 +485,7 @@ static int centrino_cpu_init_acpi(struct cpufreq_policy *policy)
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}
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if (cur_freq == centrino_model[cpu]->op_points[i].frequency)
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p.state = i;
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p->state = i;
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}
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/* notify BIOS that we exist */
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@ -464,12 +498,13 @@ static int centrino_cpu_init_acpi(struct cpufreq_policy *policy)
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err_kfree:
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kfree(centrino_model[cpu]);
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err_unreg:
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acpi_processor_unregister_performance(&p, cpu);
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acpi_processor_unregister_performance(p, cpu);
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dprintk(KERN_INFO PFX "invalid ACPI data\n");
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return (result);
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}
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#else
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static inline int centrino_cpu_init_acpi(struct cpufreq_policy *policy) { return -ENODEV; }
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static inline int centrino_cpu_early_init_acpi(void) { return 0; }
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#endif
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static int centrino_cpu_init(struct cpufreq_policy *policy)
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@ -557,10 +592,15 @@ static int centrino_cpu_exit(struct cpufreq_policy *policy)
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#ifdef CONFIG_X86_SPEEDSTEP_CENTRINO_ACPI
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if (!centrino_model[cpu]->model_name) {
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dprintk("unregistering and freeing ACPI data\n");
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acpi_processor_unregister_performance(&p, cpu);
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kfree(centrino_model[cpu]->op_points);
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kfree(centrino_model[cpu]);
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static struct acpi_processor_performance *p;
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if (acpi_perf_data[cpu]) {
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p = acpi_perf_data[cpu];
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dprintk("unregistering and freeing ACPI data\n");
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acpi_processor_unregister_performance(p, cpu);
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kfree(centrino_model[cpu]->op_points);
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kfree(centrino_model[cpu]);
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}
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}
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#endif
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@ -594,63 +634,124 @@ static int centrino_target (struct cpufreq_policy *policy,
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unsigned int relation)
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{
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unsigned int newstate = 0;
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unsigned int msr, oldmsr, h, cpu = policy->cpu;
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unsigned int msr, oldmsr = 0, h = 0, cpu = policy->cpu;
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struct cpufreq_freqs freqs;
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cpumask_t online_policy_cpus;
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cpumask_t saved_mask;
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int retval;
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cpumask_t set_mask;
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cpumask_t covered_cpus;
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int retval = 0;
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unsigned int j, k, first_cpu, tmp;
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if (centrino_model[cpu] == NULL)
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if (unlikely(centrino_model[cpu] == NULL))
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return -ENODEV;
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/*
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* Support for SMP systems.
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* Make sure we are running on the CPU that wants to change frequency
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*/
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if (unlikely(cpufreq_frequency_table_target(policy,
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centrino_model[cpu]->op_points,
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target_freq,
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relation,
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&newstate))) {
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return -EINVAL;
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}
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/* cpufreq holds the hotplug lock, so we are safe from here on */
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cpus_and(online_policy_cpus, cpu_online_map, policy->cpus);
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saved_mask = current->cpus_allowed;
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set_cpus_allowed(current, policy->cpus);
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if (!cpu_isset(smp_processor_id(), policy->cpus)) {
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dprintk("couldn't limit to CPUs in this domain\n");
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return(-EAGAIN);
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first_cpu = 1;
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cpus_clear(covered_cpus);
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for_each_cpu_mask(j, online_policy_cpus) {
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/*
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* Support for SMP systems.
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* Make sure we are running on CPU that wants to change freq
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*/
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cpus_clear(set_mask);
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if (policy->shared_type == CPUFREQ_SHARED_TYPE_ANY)
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cpus_or(set_mask, set_mask, online_policy_cpus);
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else
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cpu_set(j, set_mask);
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set_cpus_allowed(current, set_mask);
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if (unlikely(!cpu_isset(smp_processor_id(), set_mask))) {
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dprintk("couldn't limit to CPUs in this domain\n");
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retval = -EAGAIN;
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if (first_cpu) {
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/* We haven't started the transition yet. */
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goto migrate_end;
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}
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break;
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}
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msr = centrino_model[cpu]->op_points[newstate].index;
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if (first_cpu) {
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rdmsr(MSR_IA32_PERF_CTL, oldmsr, h);
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if (msr == (oldmsr & 0xffff)) {
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dprintk("no change needed - msr was and needs "
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"to be %x\n", oldmsr);
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retval = 0;
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goto migrate_end;
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}
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freqs.old = extract_clock(oldmsr, cpu, 0);
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freqs.new = extract_clock(msr, cpu, 0);
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dprintk("target=%dkHz old=%d new=%d msr=%04x\n",
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target_freq, freqs.old, freqs.new, msr);
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for_each_cpu_mask(k, online_policy_cpus) {
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freqs.cpu = k;
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cpufreq_notify_transition(&freqs,
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CPUFREQ_PRECHANGE);
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}
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first_cpu = 0;
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/* all but 16 LSB are reserved, treat them with care */
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oldmsr &= ~0xffff;
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msr &= 0xffff;
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oldmsr |= msr;
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}
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wrmsr(MSR_IA32_PERF_CTL, oldmsr, h);
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if (policy->shared_type == CPUFREQ_SHARED_TYPE_ANY)
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break;
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cpu_set(j, covered_cpus);
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}
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if (cpufreq_frequency_table_target(policy, centrino_model[cpu]->op_points, target_freq,
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relation, &newstate)) {
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retval = -EINVAL;
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goto migrate_end;
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for_each_cpu_mask(k, online_policy_cpus) {
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freqs.cpu = k;
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cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
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}
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msr = centrino_model[cpu]->op_points[newstate].index;
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rdmsr(MSR_IA32_PERF_CTL, oldmsr, h);
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if (unlikely(retval)) {
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/*
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* We have failed halfway through the frequency change.
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* We have sent callbacks to policy->cpus and
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* MSRs have already been written on coverd_cpus.
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* Best effort undo..
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*/
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if (msr == (oldmsr & 0xffff)) {
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retval = 0;
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dprintk("no change needed - msr was and needs to be %x\n", oldmsr);
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goto migrate_end;
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if (!cpus_empty(covered_cpus)) {
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for_each_cpu_mask(j, covered_cpus) {
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set_cpus_allowed(current, cpumask_of_cpu(j));
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wrmsr(MSR_IA32_PERF_CTL, oldmsr, h);
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}
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}
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tmp = freqs.new;
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freqs.new = freqs.old;
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freqs.old = tmp;
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for_each_cpu_mask(j, online_policy_cpus) {
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freqs.cpu = j;
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cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
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cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
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}
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}
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freqs.cpu = cpu;
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freqs.old = extract_clock(oldmsr, cpu, 0);
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freqs.new = extract_clock(msr, cpu, 0);
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dprintk("target=%dkHz old=%d new=%d msr=%04x\n",
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target_freq, freqs.old, freqs.new, msr);
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cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
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/* all but 16 LSB are "reserved", so treat them with
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care */
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oldmsr &= ~0xffff;
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msr &= 0xffff;
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oldmsr |= msr;
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wrmsr(MSR_IA32_PERF_CTL, oldmsr, h);
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cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
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retval = 0;
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migrate_end:
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set_cpus_allowed(current, saved_mask);
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return (retval);
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return 0;
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}
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static struct freq_attr* centrino_attr[] = {
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@ -692,12 +793,25 @@ static int __init centrino_init(void)
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if (!cpu_has(cpu, X86_FEATURE_EST))
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return -ENODEV;
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centrino_cpu_early_init_acpi();
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return cpufreq_register_driver(¢rino_driver);
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}
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static void __exit centrino_exit(void)
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{
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#ifdef CONFIG_X86_SPEEDSTEP_CENTRINO_ACPI
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unsigned int j;
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#endif
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cpufreq_unregister_driver(¢rino_driver);
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#ifdef CONFIG_X86_SPEEDSTEP_CENTRINO_ACPI
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for_each_cpu(j) {
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kfree(acpi_perf_data[j]);
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acpi_perf_data[j] = NULL;
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}
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#endif
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}
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MODULE_AUTHOR ("Jeremy Fitzhardinge <jeremy@goop.org>");
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