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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#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>#include <asm/msr.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;
if (ignore_ppc == 1) return;
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);
if (!pr->performance) continue;
ret = acpi_processor_get_platform_limit(pr); if (ret) pr_err("Failed to update 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_objs(struct acpi_processor_px, pss->package.count); 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