summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/processor_perflib.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/acpi/processor_perflib.c')
-rw-r--r--drivers/acpi/processor_perflib.c790
1 files changed, 790 insertions, 0 deletions
diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
new file mode 100644
index 0000000000..4265814c74
--- /dev/null
+++ b/drivers/acpi/processor_perflib.c
@@ -0,0 +1,790 @@
+// 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"
+
+static DEFINE_MUTEX(performance_mutex);
+
+/*
+ * _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);
+ }
+}
+
+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;
+}
+
+#ifdef CONFIG_X86
+/*
+ * 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;
+ }
+}
+#else
+static void amd_fixup_frequency(struct acpi_processor_px *px, int i) {};
+#endif
+
+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:
+#ifdef CONFIG_X86
+ 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");
+ }
+#endif
+ 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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-13 20:37:57 +0000