diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/processor_perflib.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c index 44a7b168e0ec..f02c5ea9084f 100644 --- a/drivers/acpi/processor_perflib.c +++ b/drivers/acpi/processor_perflib.c @@ -554,6 +554,230 @@ static void acpi_cpufreq_remove_file(struct acpi_processor *pr) } #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 = (union acpi_object *) 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: + acpi_os_free(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; + + down(&performance_sem); + + 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 || !performance[i]) { + retval = -EINVAL; + continue; + } + + pr->performance = 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 || + pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL) { + pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL; + } 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: + if (retval) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error while parsing _PSD domain information. Assuming no coordination\n")); + } + + 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 */ + } + + up(&performance_sem); + return retval; +} +EXPORT_SYMBOL(acpi_processor_preregister_performance); + + int acpi_processor_register_performance(struct acpi_processor_performance *performance, unsigned int cpu) |