processor_perflib.c

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#ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
/* /proc/acpi/processor/../performance interface (DEPRECATED) */

static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file);
static struct file_operations acpi_processor_perf_fops = {
	.open = acpi_processor_perf_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset)
{
	struct acpi_processor *pr = seq->private;
	int i;


	if (!pr)
		goto end;

	if (!pr->performance) {
		seq_puts(seq, "<not supported>\n");
		goto end;
	}

	seq_printf(seq, "state count:             %d\n"
		   "active state:            P%d\n",
		   pr->performance->state_count, pr->performance->state);

	seq_puts(seq, "states:\n");
	for (i = 0; i < pr->performance->state_count; i++)
		seq_printf(seq,
			   "   %cP%d:                  %d MHz, %d mW, %d uS\n",
			   (i == pr->performance->state ? '*' : ' '), i,
			   (u32) pr->performance->states[i].core_frequency,
			   (u32) pr->performance->states[i].power,
			   (u32) pr->performance->states[i].transition_latency);

      end:
	return 0;
}

static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_processor_perf_seq_show,
			   PDE(inode)->data);
}

static void acpi_cpufreq_add_file(struct acpi_processor *pr)
{
	struct proc_dir_entry *entry = NULL;
	struct acpi_device *device = NULL;


	if (acpi_bus_get_device(pr->handle, &device))
		return;

	/* add file 'performance' [R/W] */
	entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
				  S_IFREG | S_IRUGO,
				  acpi_device_dir(device));
	if (entry){
		entry->proc_fops = &acpi_processor_perf_fops;
		entry->data = acpi_driver_data(device);
		entry->owner = THIS_MODULE;
	}
	return;
}

static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
{
	struct acpi_device *device = NULL;


	if (acpi_bus_get_device(pr->handle, &device))
		return;

	/* remove file 'performance' */
	remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
			  acpi_device_dir(device));

	return;
}

#else
static void acpi_cpufreq_add_file(struct acpi_processor *pr)
{
	return;
}
static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
{
	return;
}
#endif				/* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */

static int acpi_processor_get_psd(struct acpi_processor	*pr)
{
	int result = 0;
	acpi_status status = AE_OK;
	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
	struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
	struct acpi_buffer state = {0, NULL};
	union acpi_object  *psd = NULL;
	struct acpi_psd_package *pdomain;

	status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
	if (ACPI_FAILURE(status)) {
		return -ENODEV;
	}

	psd = buffer.pointer;
	if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
		result = -EFAULT;
		goto end;
	}

	if (psd->package.count != 1) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
		result = -EFAULT;
		goto end;
	}

	pdomain = &(pr->performance->domain_info);

	state.length = sizeof(struct acpi_psd_package);
	state.pointer = pdomain;

	status = acpi_extract_package(&(psd->package.elements[0]),
		&format, &state);
	if (ACPI_FAILURE(status)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
		result = -EFAULT;
		goto end;
	}

	if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n"));
		result = -EFAULT;
		goto end;
	}

	if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n"));
		result = -EFAULT;
		goto end;
	}

end:
	kfree(buffer.pointer);
	return result;
}

int acpi_processor_preregister_performance(
		struct acpi_processor_performance *performance)
{
	int count, count_target;
	int retval = 0;
	unsigned int i, j;
	cpumask_t covered_cpus;
	struct acpi_processor *pr;
	struct acpi_psd_package *pdomain;
	struct acpi_processor *match_pr;
	struct acpi_psd_package *match_pdomain;

	mutex_lock(&performance_mutex);

	retval = 0;

	/* Call _PSD for all CPUs */
	for_each_possible_cpu(i) {
		pr = processors[i];
		if (!pr) {
			/* Look only at processors in ACPI namespace */
			continue;
		}

		if (pr->performance) {
			retval = -EBUSY;
			continue;
		}

		if (!performance || !percpu_ptr(performance, i)) {
			retval = -EINVAL;
			continue;
		}

		pr->performance = percpu_ptr(performance, i);
		cpu_set(i, pr->performance->shared_cpu_map);
		if (acpi_processor_get_psd(pr)) {
			retval = -EINVAL;
			continue;
		}
	}
	if (retval)
		goto err_ret;

	/*
	 * Now that we have _PSD data from all CPUs, lets setup P-state 
	 * domain info.
	 */
	for_each_possible_cpu(i) {
		pr = processors[i];
		if (!pr)
			continue;

		/* Basic validity check for domain info */
		pdomain = &(pr->performance->domain_info);
		if ((pdomain->revision != ACPI_PSD_REV0_REVISION) ||
		    (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) {
			retval = -EINVAL;
			goto err_ret;
		}
		if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
		    pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
		    pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
			retval = -EINVAL;
			goto err_ret;
		}
	}

	cpus_clear(covered_cpus);
	for_each_possible_cpu(i) {
		pr = processors[i];
		if (!pr)
			continue;

		if (cpu_isset(i, covered_cpus))
			continue;

		pdomain = &(pr->performance->domain_info);
		cpu_set(i, pr->performance->shared_cpu_map);
		cpu_set(i, covered_cpus);
		if (pdomain->num_processors <= 1)
			continue;

		/* Validate the Domain info */
		count_target = pdomain->num_processors;
		count = 1;
		if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
		else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;

		for_each_possible_cpu(j) {
			if (i == j)
				continue;

			match_pr = processors[j];
			if (!match_pr)
				continue;

			match_pdomain = &(match_pr->performance->domain_info);
			if (match_pdomain->domain != pdomain->domain)
				continue;

			/* Here i and j are in the same domain */

			if (match_pdomain->num_processors != count_target) {
				retval = -EINVAL;
				goto err_ret;
			}

			if (pdomain->coord_type != match_pdomain->coord_type) {
				retval = -EINVAL;
				goto err_ret;
			}

			cpu_set(j, covered_cpus);
			cpu_set(j, pr->performance->shared_cpu_map);
			count++;
		}

		for_each_possible_cpu(j) {
			if (i == j)
				continue;

			match_pr = processors[j];
			if (!match_pr)
				continue;

			match_pdomain = &(match_pr->performance->domain_info);
			if (match_pdomain->domain != pdomain->domain)
				continue;

			match_pr->performance->shared_type = 
					pr->performance->shared_type;
			match_pr->performance->shared_cpu_map =
				pr->performance->shared_cpu_map;
		}
	}

err_ret:
	for_each_possible_cpu(i) {
		pr = processors[i];
		if (!pr || !pr->performance)
			continue;

		/* Assume no coordination on any error parsing domain info */
		if (retval) {
			cpus_clear(pr->performance->shared_cpu_map);
			cpu_set(i, pr->performance->shared_cpu_map);
			pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
		}
		pr->performance = NULL; /* Will be set for real in register */
	}

	mutex_unlock(&performance_mutex);
	return retval;
}
EXPORT_SYMBOL(acpi_processor_preregister_performance);


int
acpi_processor_register_performance(struct acpi_processor_performance
				    *performance, unsigned int cpu)
{
	struct acpi_processor *pr;


	if (!(acpi_processor_ppc_status & PPC_REGISTERED))
		return -EINVAL;

	mutex_lock(&performance_mutex);

	pr = processors[cpu];
	if (!pr) {
		mutex_unlock(&performance_mutex);
		return -ENODEV;
	}

	if (pr->performance) {
		mutex_unlock(&performance_mutex);
		return -EBUSY;
	}

	WARN_ON(!performance);

	pr->performance = performance;

	if (acpi_processor_get_performance_info(pr)) {
		pr->performance = NULL;
		mutex_unlock(&performance_mutex);
		return -EIO;
	}

	acpi_cpufreq_add_file(pr);

	mutex_unlock(&performance_mutex);
	return 0;
}

EXPORT_SYMBOL(acpi_processor_register_performance);

void
acpi_processor_unregister_performance(struct acpi_processor_performance
				      *performance, unsigned int cpu)
{
	struct acpi_processor *pr;


	mutex_lock(&performance_mutex);

	pr = processors[cpu];
	if (!pr) {
		mutex_unlock(&performance_mutex);
		return;
	}

	if (pr->performance)
		kfree(pr->performance->states);
	pr->performance = NULL;

	acpi_cpufreq_remove_file(pr);

	mutex_unlock(&performance_mutex);

	return;
}

EXPORT_SYMBOL(acpi_processor_unregister_performance);