| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $) |
| * |
| * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> |
| * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> |
| * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de> |
| * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> |
| * - Added processor hotplug support |
| */ |
| |
| #define pr_fmt(fmt) "ACPI: " fmt |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/cpufreq.h> |
| #include <linux/slab.h> |
| #include <linux/acpi.h> |
| #include <acpi/processor.h> |
| #ifdef CONFIG_X86 |
| #include <asm/cpufeature.h> |
| #endif |
| |
| #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance" |
| |
| /* |
| * _PPC support is implemented as a CPUfreq policy notifier: |
| * This means each time a CPUfreq driver registered also with |
| * the ACPI core is asked to change the speed policy, the maximum |
| * value is adjusted so that it is within the platform limit. |
| * |
| * Also, when a new platform limit value is detected, the CPUfreq |
| * policy is adjusted accordingly. |
| */ |
| |
| /* ignore_ppc: |
| * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet |
| * ignore _PPC |
| * 0 -> cpufreq low level drivers initialized -> consider _PPC values |
| * 1 -> ignore _PPC totally -> forced by user through boot param |
| */ |
| static int ignore_ppc = -1; |
| module_param(ignore_ppc, int, 0644); |
| MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \ |
| "limited by BIOS, this should help"); |
| |
| static bool acpi_processor_ppc_in_use; |
| |
| static int acpi_processor_get_platform_limit(struct acpi_processor *pr) |
| { |
| acpi_status status = 0; |
| unsigned long long ppc = 0; |
| s32 qos_value; |
| int index; |
| int ret; |
| |
| if (!pr) |
| return -EINVAL; |
| |
| /* |
| * _PPC indicates the maximum state currently supported by the platform |
| * (e.g. 0 = states 0..n; 1 = states 1..n; etc. |
| */ |
| status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc); |
| if (status != AE_NOT_FOUND) { |
| acpi_processor_ppc_in_use = true; |
| |
| if (ACPI_FAILURE(status)) { |
| acpi_evaluation_failure_warn(pr->handle, "_PPC", status); |
| return -ENODEV; |
| } |
| } |
| |
| index = ppc; |
| |
| if (pr->performance_platform_limit == index || |
| ppc >= pr->performance->state_count) |
| return 0; |
| |
| pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id, |
| index, index ? "is" : "is not"); |
| |
| pr->performance_platform_limit = index; |
| |
| if (unlikely(!freq_qos_request_active(&pr->perflib_req))) |
| return 0; |
| |
| /* |
| * If _PPC returns 0, it means that all of the available states can be |
| * used ("no limit"). |
| */ |
| if (index == 0) |
| qos_value = FREQ_QOS_MAX_DEFAULT_VALUE; |
| else |
| qos_value = pr->performance->states[index].core_frequency * 1000; |
| |
| ret = freq_qos_update_request(&pr->perflib_req, qos_value); |
| if (ret < 0) { |
| pr_warn("Failed to update perflib freq constraint: CPU%d (%d)\n", |
| pr->id, ret); |
| } |
| |
| return 0; |
| } |
| |
| #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 |
| /* |
| * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status |
| * @handle: ACPI processor handle |
| * @status: the status code of _PPC evaluation |
| * 0: success. OSPM is now using the performance state specified. |
| * 1: failure. OSPM has not changed the number of P-states in use |
| */ |
| static void acpi_processor_ppc_ost(acpi_handle handle, int status) |
| { |
| if (acpi_has_method(handle, "_OST")) |
| acpi_evaluate_ost(handle, ACPI_PROCESSOR_NOTIFY_PERFORMANCE, |
| status, NULL); |
| } |
| |
| void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag) |
| { |
| int ret; |
| |
| if (ignore_ppc || !pr->performance) { |
| /* |
| * Only when it is notification event, the _OST object |
| * will be evaluated. Otherwise it is skipped. |
| */ |
| if (event_flag) |
| acpi_processor_ppc_ost(pr->handle, 1); |
| return; |
| } |
| |
| ret = acpi_processor_get_platform_limit(pr); |
| /* |
| * Only when it is notification event, the _OST object |
| * will be evaluated. Otherwise it is skipped. |
| */ |
| if (event_flag) { |
| if (ret < 0) |
| acpi_processor_ppc_ost(pr->handle, 1); |
| else |
| acpi_processor_ppc_ost(pr->handle, 0); |
| } |
| if (ret >= 0) |
| cpufreq_update_limits(pr->id); |
| } |
| |
| int acpi_processor_get_bios_limit(int cpu, unsigned int *limit) |
| { |
| struct acpi_processor *pr; |
| |
| pr = per_cpu(processors, cpu); |
| if (!pr || !pr->performance || !pr->performance->state_count) |
| return -ENODEV; |
| |
| *limit = pr->performance->states[pr->performance_platform_limit]. |
| core_frequency * 1000; |
| return 0; |
| } |
| EXPORT_SYMBOL(acpi_processor_get_bios_limit); |
| |
| void acpi_processor_ignore_ppc_init(void) |
| { |
| if (ignore_ppc < 0) |
| ignore_ppc = 0; |
| } |
| |
| void acpi_processor_ppc_init(struct cpufreq_policy *policy) |
| { |
| unsigned int cpu; |
| |
| for_each_cpu(cpu, policy->related_cpus) { |
| struct acpi_processor *pr = per_cpu(processors, cpu); |
| int ret; |
| |
| if (!pr) |
| continue; |
| |
| /* |
| * Reset performance_platform_limit in case there is a stale |
| * value in it, so as to make it match the "no limit" QoS value |
| * below. |
| */ |
| pr->performance_platform_limit = 0; |
| |
| ret = freq_qos_add_request(&policy->constraints, |
| &pr->perflib_req, FREQ_QOS_MAX, |
| FREQ_QOS_MAX_DEFAULT_VALUE); |
| if (ret < 0) |
| pr_err("Failed to add freq constraint for CPU%d (%d)\n", |
| cpu, ret); |
| } |
| } |
| |
| void acpi_processor_ppc_exit(struct cpufreq_policy *policy) |
| { |
| unsigned int cpu; |
| |
| for_each_cpu(cpu, policy->related_cpus) { |
| struct acpi_processor *pr = per_cpu(processors, cpu); |
| |
| if (pr) |
| freq_qos_remove_request(&pr->perflib_req); |
| } |
| } |
| |
| #ifdef CONFIG_X86 |
| |
| static DEFINE_MUTEX(performance_mutex); |
| |
| static int acpi_processor_get_performance_control(struct acpi_processor *pr) |
| { |
| int result = 0; |
| acpi_status status = 0; |
| struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| union acpi_object *pct = NULL; |
| union acpi_object obj = { 0 }; |
| |
| status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer); |
| if (ACPI_FAILURE(status)) { |
| acpi_evaluation_failure_warn(pr->handle, "_PCT", status); |
| return -ENODEV; |
| } |
| |
| pct = (union acpi_object *)buffer.pointer; |
| if (!pct || pct->type != ACPI_TYPE_PACKAGE || pct->package.count != 2) { |
| pr_err("Invalid _PCT data\n"); |
| result = -EFAULT; |
| goto end; |
| } |
| |
| /* |
| * control_register |
| */ |
| |
| obj = pct->package.elements[0]; |
| |
| if (!obj.buffer.pointer || obj.type != ACPI_TYPE_BUFFER || |
| obj.buffer.length < sizeof(struct acpi_pct_register)) { |
| pr_err("Invalid _PCT data (control_register)\n"); |
| result = -EFAULT; |
| goto end; |
| } |
| memcpy(&pr->performance->control_register, obj.buffer.pointer, |
| sizeof(struct acpi_pct_register)); |
| |
| /* |
| * status_register |
| */ |
| |
| obj = pct->package.elements[1]; |
| |
| if (!obj.buffer.pointer || obj.type != ACPI_TYPE_BUFFER || |
| obj.buffer.length < sizeof(struct acpi_pct_register)) { |
| pr_err("Invalid _PCT data (status_register)\n"); |
| result = -EFAULT; |
| goto end; |
| } |
| |
| memcpy(&pr->performance->status_register, obj.buffer.pointer, |
| sizeof(struct acpi_pct_register)); |
| |
| end: |
| kfree(buffer.pointer); |
| |
| return result; |
| } |
| |
| /* |
| * Some AMDs have 50MHz frequency multiples, but only provide 100MHz rounding |
| * in their ACPI data. Calculate the real values and fix up the _PSS data. |
| */ |
| static void amd_fixup_frequency(struct acpi_processor_px *px, int i) |
| { |
| u32 hi, lo, fid, did; |
| int index = px->control & 0x00000007; |
| |
| if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) |
| return; |
| |
| if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10) || |
| boot_cpu_data.x86 == 0x11) { |
| rdmsr(MSR_AMD_PSTATE_DEF_BASE + index, lo, hi); |
| /* |
| * MSR C001_0064+: |
| * Bit 63: PstateEn. Read-write. If set, the P-state is valid. |
| */ |
| if (!(hi & BIT(31))) |
| return; |
| |
| fid = lo & 0x3f; |
| did = (lo >> 6) & 7; |
| if (boot_cpu_data.x86 == 0x10) |
| px->core_frequency = (100 * (fid + 0x10)) >> did; |
| else |
| px->core_frequency = (100 * (fid + 8)) >> did; |
| } |
| } |
| |
| static int acpi_processor_get_performance_states(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("NNNNNN"), "NNNNNN" }; |
| struct acpi_buffer state = { 0, NULL }; |
| union acpi_object *pss = NULL; |
| int i; |
| int last_invalid = -1; |
| |
| status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); |
| if (ACPI_FAILURE(status)) { |
| acpi_evaluation_failure_warn(pr->handle, "_PSS", status); |
| return -ENODEV; |
| } |
| |
| pss = buffer.pointer; |
| if (!pss || pss->type != ACPI_TYPE_PACKAGE) { |
| pr_err("Invalid _PSS data\n"); |
| result = -EFAULT; |
| goto end; |
| } |
| |
| acpi_handle_debug(pr->handle, "Found %d performance states\n", |
| pss->package.count); |
| |
| pr->performance->state_count = pss->package.count; |
| pr->performance->states = |
| kmalloc_array(pss->package.count, |
| sizeof(struct acpi_processor_px), |
| GFP_KERNEL); |
| if (!pr->performance->states) { |
| result = -ENOMEM; |
| goto end; |
| } |
| |
| for (i = 0; i < pr->performance->state_count; i++) { |
| |
| struct acpi_processor_px *px = &(pr->performance->states[i]); |
| |
| state.length = sizeof(struct acpi_processor_px); |
| state.pointer = px; |
| |
| acpi_handle_debug(pr->handle, "Extracting state %d\n", i); |
| |
| status = acpi_extract_package(&(pss->package.elements[i]), |
| &format, &state); |
| if (ACPI_FAILURE(status)) { |
| acpi_handle_warn(pr->handle, "Invalid _PSS data: %s\n", |
| acpi_format_exception(status)); |
| result = -EFAULT; |
| kfree(pr->performance->states); |
| goto end; |
| } |
| |
| amd_fixup_frequency(px, i); |
| |
| acpi_handle_debug(pr->handle, |
| "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n", |
| i, |
| (u32) px->core_frequency, |
| (u32) px->power, |
| (u32) px->transition_latency, |
| (u32) px->bus_master_latency, |
| (u32) px->control, (u32) px->status); |
| |
| /* |
| * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq |
| */ |
| if (!px->core_frequency || |
| (u32)(px->core_frequency * 1000) != px->core_frequency * 1000) { |
| pr_err(FW_BUG |
| "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n", |
| pr->id, px->core_frequency); |
| if (last_invalid == -1) |
| last_invalid = i; |
| } else { |
| if (last_invalid != -1) { |
| /* |
| * Copy this valid entry over last_invalid entry |
| */ |
| memcpy(&(pr->performance->states[last_invalid]), |
| px, sizeof(struct acpi_processor_px)); |
| ++last_invalid; |
| } |
| } |
| } |
| |
| if (last_invalid == 0) { |
| pr_err(FW_BUG |
| "No valid BIOS _PSS frequency found for processor %d\n", pr->id); |
| result = -EFAULT; |
| kfree(pr->performance->states); |
| pr->performance->states = NULL; |
| } |
| |
| if (last_invalid > 0) |
| pr->performance->state_count = last_invalid; |
| |
| end: |
| kfree(buffer.pointer); |
| |
| return result; |
| } |
| |
| int acpi_processor_get_performance_info(struct acpi_processor *pr) |
| { |
| int result = 0; |
| |
| if (!pr || !pr->performance || !pr->handle) |
| return -EINVAL; |
| |
| if (!acpi_has_method(pr->handle, "_PCT")) { |
| acpi_handle_debug(pr->handle, |
| "ACPI-based processor performance control unavailable\n"); |
| return -ENODEV; |
| } |
| |
| result = acpi_processor_get_performance_control(pr); |
| if (result) |
| goto update_bios; |
| |
| result = acpi_processor_get_performance_states(pr); |
| if (result) |
| goto update_bios; |
| |
| /* We need to call _PPC once when cpufreq starts */ |
| if (ignore_ppc != 1) |
| result = acpi_processor_get_platform_limit(pr); |
| |
| return result; |
| |
| /* |
| * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that |
| * the BIOS is older than the CPU and does not know its frequencies |
| */ |
| update_bios: |
| if (acpi_has_method(pr->handle, "_PPC")) { |
| if(boot_cpu_has(X86_FEATURE_EST)) |
| pr_warn(FW_BUG "BIOS needs update for CPU " |
| "frequency support\n"); |
| } |
| return result; |
| } |
| EXPORT_SYMBOL_GPL(acpi_processor_get_performance_info); |
| |
| int acpi_processor_pstate_control(void) |
| { |
| acpi_status status; |
| |
| if (!acpi_gbl_FADT.smi_command || !acpi_gbl_FADT.pstate_control) |
| return 0; |
| |
| pr_debug("Writing pstate_control [0x%x] to smi_command [0x%x]\n", |
| acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command); |
| |
| status = acpi_os_write_port(acpi_gbl_FADT.smi_command, |
| (u32)acpi_gbl_FADT.pstate_control, 8); |
| if (ACPI_SUCCESS(status)) |
| return 1; |
| |
| pr_warn("Failed to write pstate_control [0x%x] to smi_command [0x%x]: %s\n", |
| acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command, |
| acpi_format_exception(status)); |
| return -EIO; |
| } |
| |
| int acpi_processor_notify_smm(struct module *calling_module) |
| { |
| static int is_done; |
| int result = 0; |
| |
| if (!acpi_processor_cpufreq_init) |
| return -EBUSY; |
| |
| if (!try_module_get(calling_module)) |
| return -EINVAL; |
| |
| /* |
| * is_done is set to negative if an error occurs and to 1 if no error |
| * occurrs, but SMM has been notified already. This avoids repeated |
| * notification which might lead to unexpected results. |
| */ |
| if (is_done != 0) { |
| if (is_done < 0) |
| result = is_done; |
| |
| goto out_put; |
| } |
| |
| result = acpi_processor_pstate_control(); |
| if (result <= 0) { |
| if (result) { |
| is_done = result; |
| } else { |
| pr_debug("No SMI port or pstate_control\n"); |
| is_done = 1; |
| } |
| goto out_put; |
| } |
| |
| is_done = 1; |
| /* |
| * Success. If there _PPC, unloading the cpufreq driver would be risky, |
| * so disallow it in that case. |
| */ |
| if (acpi_processor_ppc_in_use) |
| return 0; |
| |
| out_put: |
| module_put(calling_module); |
| return result; |
| } |
| EXPORT_SYMBOL(acpi_processor_notify_smm); |
| |
| int acpi_processor_get_psd(acpi_handle handle, struct acpi_psd_package *pdomain) |
| { |
| 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; |
| |
| status = acpi_evaluate_object(handle, "_PSD", NULL, &buffer); |
| if (ACPI_FAILURE(status)) { |
| return -ENODEV; |
| } |
| |
| psd = buffer.pointer; |
| if (!psd || psd->type != ACPI_TYPE_PACKAGE) { |
| pr_err("Invalid _PSD data\n"); |
| result = -EFAULT; |
| goto end; |
| } |
| |
| if (psd->package.count != 1) { |
| pr_err("Invalid _PSD data\n"); |
| result = -EFAULT; |
| goto end; |
| } |
| |
| state.length = sizeof(struct acpi_psd_package); |
| state.pointer = pdomain; |
| |
| status = acpi_extract_package(&(psd->package.elements[0]), &format, &state); |
| if (ACPI_FAILURE(status)) { |
| pr_err("Invalid _PSD data\n"); |
| result = -EFAULT; |
| goto end; |
| } |
| |
| if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) { |
| pr_err("Unknown _PSD:num_entries\n"); |
| result = -EFAULT; |
| goto end; |
| } |
| |
| if (pdomain->revision != ACPI_PSD_REV0_REVISION) { |
| pr_err("Unknown _PSD:revision\n"); |
| result = -EFAULT; |
| goto end; |
| } |
| |
| 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) { |
| pr_err("Invalid _PSD:coord_type\n"); |
| result = -EFAULT; |
| goto end; |
| } |
| end: |
| kfree(buffer.pointer); |
| return result; |
| } |
| EXPORT_SYMBOL(acpi_processor_get_psd); |
| |
| int acpi_processor_preregister_performance( |
| struct acpi_processor_performance __percpu *performance) |
| { |
| int count_target; |
| int retval = 0; |
| unsigned int i, j; |
| cpumask_var_t covered_cpus; |
| struct acpi_processor *pr; |
| struct acpi_psd_package *pdomain; |
| struct acpi_processor *match_pr; |
| struct acpi_psd_package *match_pdomain; |
| |
| if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)) |
| return -ENOMEM; |
| |
| mutex_lock(&performance_mutex); |
| |
| /* |
| * Check if another driver has already registered, and abort before |
| * changing pr->performance if it has. Check input data as well. |
| */ |
| for_each_possible_cpu(i) { |
| pr = per_cpu(processors, i); |
| if (!pr) { |
| /* Look only at processors in ACPI namespace */ |
| continue; |
| } |
| |
| if (pr->performance) { |
| retval = -EBUSY; |
| goto err_out; |
| } |
| |
| if (!performance || !per_cpu_ptr(performance, i)) { |
| retval = -EINVAL; |
| goto err_out; |
| } |
| } |
| |
| /* Call _PSD for all CPUs */ |
| for_each_possible_cpu(i) { |
| pr = per_cpu(processors, i); |
| if (!pr) |
| continue; |
| |
| pr->performance = per_cpu_ptr(performance, i); |
| pdomain = &(pr->performance->domain_info); |
| if (acpi_processor_get_psd(pr->handle, pdomain)) { |
| 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 = per_cpu(processors, i); |
| if (!pr) |
| continue; |
| |
| if (cpumask_test_cpu(i, covered_cpus)) |
| continue; |
| |
| pdomain = &(pr->performance->domain_info); |
| cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
| cpumask_set_cpu(i, covered_cpus); |
| if (pdomain->num_processors <= 1) |
| continue; |
| |
| /* Validate the Domain info */ |
| count_target = pdomain->num_processors; |
| 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 = per_cpu(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; |
| } |
| |
| cpumask_set_cpu(j, covered_cpus); |
| cpumask_set_cpu(j, pr->performance->shared_cpu_map); |
| } |
| |
| for_each_possible_cpu(j) { |
| if (i == j) |
| continue; |
| |
| match_pr = per_cpu(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; |
| cpumask_copy(match_pr->performance->shared_cpu_map, |
| pr->performance->shared_cpu_map); |
| } |
| } |
| |
| err_ret: |
| for_each_possible_cpu(i) { |
| pr = per_cpu(processors, i); |
| if (!pr || !pr->performance) |
| continue; |
| |
| /* Assume no coordination on any error parsing domain info */ |
| if (retval) { |
| cpumask_clear(pr->performance->shared_cpu_map); |
| cpumask_set_cpu(i, pr->performance->shared_cpu_map); |
| pr->performance->shared_type = CPUFREQ_SHARED_TYPE_NONE; |
| } |
| pr->performance = NULL; /* Will be set for real in register */ |
| } |
| |
| err_out: |
| mutex_unlock(&performance_mutex); |
| free_cpumask_var(covered_cpus); |
| 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_cpufreq_init) |
| return -EINVAL; |
| |
| mutex_lock(&performance_mutex); |
| |
| pr = per_cpu(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; |
| } |
| |
| mutex_unlock(&performance_mutex); |
| return 0; |
| } |
| EXPORT_SYMBOL(acpi_processor_register_performance); |
| |
| void acpi_processor_unregister_performance(unsigned int cpu) |
| { |
| struct acpi_processor *pr; |
| |
| mutex_lock(&performance_mutex); |
| |
| pr = per_cpu(processors, cpu); |
| if (!pr) |
| goto unlock; |
| |
| if (pr->performance) |
| kfree(pr->performance->states); |
| |
| pr->performance = NULL; |
| |
| unlock: |
| mutex_unlock(&performance_mutex); |
| } |
| EXPORT_SYMBOL(acpi_processor_unregister_performance); |
| #endif |