P-state software coordination for ACPI core
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
committed by
Len Brown
Len Brown
parent
0bdd340c09
commit
3b2d99429e
@@ -553,6 +553,234 @@ static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
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}
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#endif /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
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static int acpi_processor_get_psd(struct acpi_processor *pr)
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{
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int result = 0;
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acpi_status status = AE_OK;
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struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
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struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
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struct acpi_buffer state = {0, NULL};
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union acpi_object *psd = NULL;
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struct acpi_psd_package *pdomain;
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ACPI_FUNCTION_TRACE("acpi_processor_get_psd");
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status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
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if (ACPI_FAILURE(status)) {
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return_VALUE(-ENODEV);
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}
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psd = (union acpi_object *) buffer.pointer;
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if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
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result = -EFAULT;
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goto end;
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}
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if (psd->package.count != 1) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
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result = -EFAULT;
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goto end;
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}
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pdomain = &(pr->performance->domain_info);
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state.length = sizeof(struct acpi_psd_package);
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state.pointer = pdomain;
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status = acpi_extract_package(&(psd->package.elements[0]),
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&format, &state);
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if (ACPI_FAILURE(status)) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
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result = -EFAULT;
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goto end;
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}
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if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n"));
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result = -EFAULT;
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goto end;
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}
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if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n"));
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result = -EFAULT;
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goto end;
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}
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end:
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acpi_os_free(buffer.pointer);
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return_VALUE(result);
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}
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int acpi_processor_preregister_performance(
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struct acpi_processor_performance **performance)
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{
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int count, count_target;
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int retval = 0;
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unsigned int i, j;
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cpumask_t covered_cpus;
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struct acpi_processor *pr;
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struct acpi_psd_package *pdomain;
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struct acpi_processor *match_pr;
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struct acpi_psd_package *match_pdomain;
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ACPI_FUNCTION_TRACE("acpi_processor_preregister_performance");
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down(&performance_sem);
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retval = 0;
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/* Call _PSD for all CPUs */
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for_each_cpu(i) {
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pr = processors[i];
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if (!pr) {
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/* Look only at processors in ACPI namespace */
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continue;
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}
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if (pr->performance) {
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retval = -EBUSY;
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continue;
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}
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if (!performance || !performance[i]) {
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retval = -EINVAL;
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continue;
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}
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pr->performance = performance[i];
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cpu_set(i, pr->performance->shared_cpu_map);
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if (acpi_processor_get_psd(pr)) {
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retval = -EINVAL;
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continue;
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}
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}
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if (retval)
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goto err_ret;
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/*
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* Now that we have _PSD data from all CPUs, lets setup P-state
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* domain info.
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*/
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for_each_cpu(i) {
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pr = processors[i];
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if (!pr)
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continue;
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/* Basic validity check for domain info */
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pdomain = &(pr->performance->domain_info);
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if ((pdomain->revision != ACPI_PSD_REV0_REVISION) ||
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(pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) {
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retval = -EINVAL;
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goto err_ret;
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}
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if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
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pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
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pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
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retval = -EINVAL;
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goto err_ret;
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}
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}
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cpus_clear(covered_cpus);
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for_each_cpu(i) {
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pr = processors[i];
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if (!pr)
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continue;
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if (cpu_isset(i, covered_cpus))
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continue;
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pdomain = &(pr->performance->domain_info);
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cpu_set(i, pr->performance->shared_cpu_map);
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cpu_set(i, covered_cpus);
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if (pdomain->num_processors <= 1)
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continue;
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/* Validate the Domain info */
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count_target = pdomain->num_processors;
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count = 1;
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if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL ||
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pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) {
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pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
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} else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY) {
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pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
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}
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for_each_cpu(j) {
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if (i == j)
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continue;
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match_pr = processors[j];
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if (!match_pr)
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continue;
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match_pdomain = &(match_pr->performance->domain_info);
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if (match_pdomain->domain != pdomain->domain)
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continue;
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/* Here i and j are in the same domain */
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if (match_pdomain->num_processors != count_target) {
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retval = -EINVAL;
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goto err_ret;
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}
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if (pdomain->coord_type != match_pdomain->coord_type) {
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retval = -EINVAL;
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goto err_ret;
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}
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cpu_set(j, covered_cpus);
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cpu_set(j, pr->performance->shared_cpu_map);
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count++;
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}
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for_each_cpu(j) {
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if (i == j)
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continue;
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match_pr = processors[j];
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if (!match_pr)
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continue;
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match_pdomain = &(match_pr->performance->domain_info);
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if (match_pdomain->domain != pdomain->domain)
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continue;
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match_pr->performance->shared_type =
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pr->performance->shared_type;
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match_pr->performance->shared_cpu_map =
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pr->performance->shared_cpu_map;
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}
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}
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err_ret:
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if (retval) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error while parsing _PSD domain information. Assuming no coordination\n"));
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}
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for_each_cpu(i) {
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pr = processors[i];
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if (!pr || !pr->performance)
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continue;
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/* Assume no coordination on any error parsing domain info */
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if (retval) {
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cpus_clear(pr->performance->shared_cpu_map);
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cpu_set(i, pr->performance->shared_cpu_map);
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pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
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}
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pr->performance = NULL; /* Will be set for real in register */
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}
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up(&performance_sem);
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return_VALUE(retval);
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}
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EXPORT_SYMBOL(acpi_processor_preregister_performance);
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int
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acpi_processor_register_performance(struct acpi_processor_performance
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*performance, unsigned int cpu)
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