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![Colin Ian King](/assets/img/avatar_default.png)
Variable count is just being incremented and it's never used anywhere else. The variable and the increment are redundant so remove it. Signed-off-by: Colin Ian King <colin.i.king@gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1242 lines
30 KiB
C
1242 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* processor_throttling.c - Throttling submodule of the ACPI processor driver
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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* Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
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* Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
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* - Added processor hotplug support
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*/
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#define pr_fmt(fmt) "ACPI: " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/cpufreq.h>
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#include <linux/acpi.h>
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#include <acpi/processor.h>
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#include <asm/io.h>
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#include <linux/uaccess.h>
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/* ignore_tpc:
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* 0 -> acpi processor driver doesn't ignore _TPC values
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* 1 -> acpi processor driver ignores _TPC values
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*/
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static int ignore_tpc;
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module_param(ignore_tpc, int, 0644);
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MODULE_PARM_DESC(ignore_tpc, "Disable broken BIOS _TPC throttling support");
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struct throttling_tstate {
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unsigned int cpu; /* cpu nr */
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int target_state; /* target T-state */
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};
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struct acpi_processor_throttling_arg {
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struct acpi_processor *pr;
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int target_state;
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bool force;
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};
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#define THROTTLING_PRECHANGE (1)
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#define THROTTLING_POSTCHANGE (2)
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static int acpi_processor_get_throttling(struct acpi_processor *pr);
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static int __acpi_processor_set_throttling(struct acpi_processor *pr,
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int state, bool force, bool direct);
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static int acpi_processor_update_tsd_coord(void)
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{
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int count_target;
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int retval = 0;
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unsigned int i, j;
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cpumask_var_t covered_cpus;
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struct acpi_processor *pr, *match_pr;
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struct acpi_tsd_package *pdomain, *match_pdomain;
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struct acpi_processor_throttling *pthrottling, *match_pthrottling;
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if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
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return -ENOMEM;
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/*
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* Now that we have _TSD data from all CPUs, lets setup T-state
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* coordination between all CPUs.
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*/
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for_each_possible_cpu(i) {
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pr = per_cpu(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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pthrottling = &(pr->throttling);
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/*
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* If tsd package for one cpu is invalid, the coordination
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* among all CPUs is thought as invalid.
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* Maybe it is ugly.
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*/
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if (!pthrottling->tsd_valid_flag) {
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retval = -EINVAL;
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break;
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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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for_each_possible_cpu(i) {
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pr = per_cpu(processors, i);
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if (!pr)
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continue;
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if (cpumask_test_cpu(i, covered_cpus))
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continue;
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pthrottling = &pr->throttling;
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pdomain = &(pthrottling->domain_info);
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cpumask_set_cpu(i, pthrottling->shared_cpu_map);
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cpumask_set_cpu(i, covered_cpus);
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/*
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* If the number of processor in the TSD domain is 1, it is
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* unnecessary to parse the coordination for this CPU.
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*/
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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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for_each_possible_cpu(j) {
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if (i == j)
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continue;
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match_pr = per_cpu(processors, j);
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if (!match_pr)
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continue;
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match_pthrottling = &(match_pr->throttling);
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match_pdomain = &(match_pthrottling->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 two TSD packages have the same domain, they
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* should have the same num_porcessors and
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* coordination type. Otherwise it will be regarded
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* as illegal.
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*/
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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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cpumask_set_cpu(j, covered_cpus);
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cpumask_set_cpu(j, pthrottling->shared_cpu_map);
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}
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for_each_possible_cpu(j) {
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if (i == j)
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continue;
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match_pr = per_cpu(processors, j);
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if (!match_pr)
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continue;
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match_pthrottling = &(match_pr->throttling);
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match_pdomain = &(match_pthrottling->domain_info);
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if (match_pdomain->domain != pdomain->domain)
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continue;
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/*
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* If some CPUS have the same domain, they
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* will have the same shared_cpu_map.
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*/
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cpumask_copy(match_pthrottling->shared_cpu_map,
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pthrottling->shared_cpu_map);
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}
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}
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err_ret:
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free_cpumask_var(covered_cpus);
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for_each_possible_cpu(i) {
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pr = per_cpu(processors, i);
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if (!pr)
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continue;
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/*
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* Assume no coordination on any error parsing domain info.
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* The coordination type will be forced as SW_ALL.
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*/
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if (retval) {
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pthrottling = &(pr->throttling);
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cpumask_clear(pthrottling->shared_cpu_map);
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cpumask_set_cpu(i, pthrottling->shared_cpu_map);
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pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL;
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}
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}
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return retval;
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}
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/*
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* Update the T-state coordination after the _TSD
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* data for all cpus is obtained.
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*/
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void acpi_processor_throttling_init(void)
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{
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if (acpi_processor_update_tsd_coord())
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pr_debug("Assume no T-state coordination\n");
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}
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static int acpi_processor_throttling_notifier(unsigned long event, void *data)
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{
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struct throttling_tstate *p_tstate = data;
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struct acpi_processor *pr;
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unsigned int cpu;
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int target_state;
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struct acpi_processor_limit *p_limit;
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struct acpi_processor_throttling *p_throttling;
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cpu = p_tstate->cpu;
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pr = per_cpu(processors, cpu);
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if (!pr) {
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pr_debug("Invalid pr pointer\n");
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return 0;
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}
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if (!pr->flags.throttling) {
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acpi_handle_debug(pr->handle,
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"Throttling control unsupported on CPU %d\n",
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cpu);
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return 0;
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}
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target_state = p_tstate->target_state;
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p_throttling = &(pr->throttling);
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switch (event) {
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case THROTTLING_PRECHANGE:
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/*
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* Prechange event is used to choose one proper t-state,
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* which meets the limits of thermal, user and _TPC.
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*/
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p_limit = &pr->limit;
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if (p_limit->thermal.tx > target_state)
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target_state = p_limit->thermal.tx;
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if (p_limit->user.tx > target_state)
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target_state = p_limit->user.tx;
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if (pr->throttling_platform_limit > target_state)
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target_state = pr->throttling_platform_limit;
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if (target_state >= p_throttling->state_count) {
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pr_warn("Exceed the limit of T-state \n");
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target_state = p_throttling->state_count - 1;
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}
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p_tstate->target_state = target_state;
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acpi_handle_debug(pr->handle,
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"PreChange Event: target T-state of CPU %d is T%d\n",
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cpu, target_state);
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break;
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case THROTTLING_POSTCHANGE:
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/*
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* Postchange event is only used to update the
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* T-state flag of acpi_processor_throttling.
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*/
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p_throttling->state = target_state;
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acpi_handle_debug(pr->handle,
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"PostChange Event: CPU %d is switched to T%d\n",
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cpu, target_state);
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break;
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default:
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pr_warn("Unsupported Throttling notifier event\n");
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break;
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}
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return 0;
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}
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/*
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* _TPC - Throttling Present Capabilities
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*/
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static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
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{
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acpi_status status = 0;
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unsigned long long tpc = 0;
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if (!pr)
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return -EINVAL;
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if (ignore_tpc)
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goto end;
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status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc);
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if (ACPI_FAILURE(status)) {
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if (status != AE_NOT_FOUND)
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acpi_evaluation_failure_warn(pr->handle, "_TPC", status);
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return -ENODEV;
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}
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end:
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pr->throttling_platform_limit = (int)tpc;
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return 0;
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}
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int acpi_processor_tstate_has_changed(struct acpi_processor *pr)
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{
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int result = 0;
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int throttling_limit;
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int current_state;
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struct acpi_processor_limit *limit;
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int target_state;
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if (ignore_tpc)
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return 0;
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result = acpi_processor_get_platform_limit(pr);
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if (result) {
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/* Throttling Limit is unsupported */
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return result;
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}
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throttling_limit = pr->throttling_platform_limit;
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if (throttling_limit >= pr->throttling.state_count) {
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/* Uncorrect Throttling Limit */
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return -EINVAL;
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}
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current_state = pr->throttling.state;
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if (current_state > throttling_limit) {
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/*
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* The current state can meet the requirement of
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* _TPC limit. But it is reasonable that OSPM changes
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* t-states from high to low for better performance.
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* Of course the limit condition of thermal
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* and user should be considered.
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*/
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limit = &pr->limit;
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target_state = throttling_limit;
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if (limit->thermal.tx > target_state)
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target_state = limit->thermal.tx;
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if (limit->user.tx > target_state)
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target_state = limit->user.tx;
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} else if (current_state == throttling_limit) {
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/*
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* Unnecessary to change the throttling state
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*/
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return 0;
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} else {
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/*
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* If the current state is lower than the limit of _TPC, it
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* will be forced to switch to the throttling state defined
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* by throttling_platfor_limit.
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* Because the previous state meets with the limit condition
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* of thermal and user, it is unnecessary to check it again.
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*/
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target_state = throttling_limit;
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}
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return acpi_processor_set_throttling(pr, target_state, false);
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}
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/*
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* This function is used to reevaluate whether the T-state is valid
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* after one CPU is onlined/offlined.
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* It is noted that it won't reevaluate the following properties for
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* the T-state.
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* 1. Control method.
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* 2. the number of supported T-state
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* 3. TSD domain
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*/
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void acpi_processor_reevaluate_tstate(struct acpi_processor *pr,
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bool is_dead)
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{
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int result = 0;
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if (is_dead) {
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/* When one CPU is offline, the T-state throttling
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* will be invalidated.
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*/
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pr->flags.throttling = 0;
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return;
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}
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/* the following is to recheck whether the T-state is valid for
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* the online CPU
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*/
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if (!pr->throttling.state_count) {
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/* If the number of T-state is invalid, it is
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* invalidated.
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*/
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pr->flags.throttling = 0;
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return;
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}
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pr->flags.throttling = 1;
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/* Disable throttling (if enabled). We'll let subsequent
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* policy (e.g.thermal) decide to lower performance if it
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* so chooses, but for now we'll crank up the speed.
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*/
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result = acpi_processor_get_throttling(pr);
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if (result)
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goto end;
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if (pr->throttling.state) {
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result = acpi_processor_set_throttling(pr, 0, false);
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if (result)
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goto end;
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}
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end:
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if (result)
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pr->flags.throttling = 0;
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}
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/*
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* _PTC - Processor Throttling Control (and status) register location
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*/
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static int acpi_processor_get_throttling_control(struct acpi_processor *pr)
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{
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int result = 0;
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acpi_status status = 0;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *ptc = NULL;
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union acpi_object obj;
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struct acpi_processor_throttling *throttling;
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status = acpi_evaluate_object(pr->handle, "_PTC", NULL, &buffer);
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if (ACPI_FAILURE(status)) {
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if (status != AE_NOT_FOUND)
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acpi_evaluation_failure_warn(pr->handle, "_PTC", status);
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return -ENODEV;
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}
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ptc = (union acpi_object *)buffer.pointer;
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if (!ptc || (ptc->type != ACPI_TYPE_PACKAGE)
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|| (ptc->package.count != 2)) {
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pr_err("Invalid _PTC data\n");
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result = -EFAULT;
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goto end;
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}
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|
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/*
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* control_register
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*/
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obj = ptc->package.elements[0];
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if ((obj.type != ACPI_TYPE_BUFFER)
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|| (obj.buffer.length < sizeof(struct acpi_ptc_register))
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|| (obj.buffer.pointer == NULL)) {
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pr_err("Invalid _PTC data (control_register)\n");
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result = -EFAULT;
|
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goto end;
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|
}
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memcpy(&pr->throttling.control_register, obj.buffer.pointer,
|
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sizeof(struct acpi_ptc_register));
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|
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/*
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* status_register
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*/
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|
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obj = ptc->package.elements[1];
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|
|
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if ((obj.type != ACPI_TYPE_BUFFER)
|
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|| (obj.buffer.length < sizeof(struct acpi_ptc_register))
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|| (obj.buffer.pointer == NULL)) {
|
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pr_err("Invalid _PTC data (status_register)\n");
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|
result = -EFAULT;
|
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goto end;
|
|
}
|
|
|
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memcpy(&pr->throttling.status_register, obj.buffer.pointer,
|
|
sizeof(struct acpi_ptc_register));
|
|
|
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throttling = &pr->throttling;
|
|
|
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if ((throttling->control_register.bit_width +
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throttling->control_register.bit_offset) > 32) {
|
|
pr_err("Invalid _PTC control register\n");
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
if ((throttling->status_register.bit_width +
|
|
throttling->status_register.bit_offset) > 32) {
|
|
pr_err("Invalid _PTC status register\n");
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
end:
|
|
kfree(buffer.pointer);
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* _TSS - Throttling Supported States
|
|
*/
|
|
static int acpi_processor_get_throttling_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("NNNNN"), "NNNNN" };
|
|
struct acpi_buffer state = { 0, NULL };
|
|
union acpi_object *tss = NULL;
|
|
int i;
|
|
|
|
status = acpi_evaluate_object(pr->handle, "_TSS", NULL, &buffer);
|
|
if (ACPI_FAILURE(status)) {
|
|
if (status != AE_NOT_FOUND)
|
|
acpi_evaluation_failure_warn(pr->handle, "_TSS", status);
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
tss = buffer.pointer;
|
|
if (!tss || (tss->type != ACPI_TYPE_PACKAGE)) {
|
|
pr_err("Invalid _TSS data\n");
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
acpi_handle_debug(pr->handle, "Found %d throttling states\n",
|
|
tss->package.count);
|
|
|
|
pr->throttling.state_count = tss->package.count;
|
|
pr->throttling.states_tss =
|
|
kmalloc_array(tss->package.count,
|
|
sizeof(struct acpi_processor_tx_tss),
|
|
GFP_KERNEL);
|
|
if (!pr->throttling.states_tss) {
|
|
result = -ENOMEM;
|
|
goto end;
|
|
}
|
|
|
|
for (i = 0; i < pr->throttling.state_count; i++) {
|
|
|
|
struct acpi_processor_tx_tss *tx =
|
|
(struct acpi_processor_tx_tss *)&(pr->throttling.
|
|
states_tss[i]);
|
|
|
|
state.length = sizeof(struct acpi_processor_tx_tss);
|
|
state.pointer = tx;
|
|
|
|
acpi_handle_debug(pr->handle, "Extracting state %d\n", i);
|
|
|
|
status = acpi_extract_package(&(tss->package.elements[i]),
|
|
&format, &state);
|
|
if (ACPI_FAILURE(status)) {
|
|
acpi_handle_warn(pr->handle, "Invalid _TSS data: %s\n",
|
|
acpi_format_exception(status));
|
|
result = -EFAULT;
|
|
kfree(pr->throttling.states_tss);
|
|
goto end;
|
|
}
|
|
|
|
if (!tx->freqpercentage) {
|
|
pr_err("Invalid _TSS data: freq is zero\n");
|
|
result = -EFAULT;
|
|
kfree(pr->throttling.states_tss);
|
|
goto end;
|
|
}
|
|
}
|
|
|
|
end:
|
|
kfree(buffer.pointer);
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* _TSD - T-State Dependencies
|
|
*/
|
|
static int acpi_processor_get_tsd(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 *tsd = NULL;
|
|
struct acpi_tsd_package *pdomain;
|
|
struct acpi_processor_throttling *pthrottling;
|
|
|
|
pthrottling = &pr->throttling;
|
|
pthrottling->tsd_valid_flag = 0;
|
|
|
|
status = acpi_evaluate_object(pr->handle, "_TSD", NULL, &buffer);
|
|
if (ACPI_FAILURE(status)) {
|
|
if (status != AE_NOT_FOUND)
|
|
acpi_evaluation_failure_warn(pr->handle, "_TSD", status);
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
tsd = buffer.pointer;
|
|
if (!tsd || (tsd->type != ACPI_TYPE_PACKAGE)) {
|
|
pr_err("Invalid _TSD data\n");
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
if (tsd->package.count != 1) {
|
|
pr_err("Invalid _TSD data\n");
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
pdomain = &(pr->throttling.domain_info);
|
|
|
|
state.length = sizeof(struct acpi_tsd_package);
|
|
state.pointer = pdomain;
|
|
|
|
status = acpi_extract_package(&(tsd->package.elements[0]),
|
|
&format, &state);
|
|
if (ACPI_FAILURE(status)) {
|
|
pr_err("Invalid _TSD data\n");
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
if (pdomain->num_entries != ACPI_TSD_REV0_ENTRIES) {
|
|
pr_err("Unknown _TSD:num_entries\n");
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
if (pdomain->revision != ACPI_TSD_REV0_REVISION) {
|
|
pr_err("Unknown _TSD:revision\n");
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
pthrottling = &pr->throttling;
|
|
pthrottling->tsd_valid_flag = 1;
|
|
pthrottling->shared_type = pdomain->coord_type;
|
|
cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map);
|
|
/*
|
|
* If the coordination type is not defined in ACPI spec,
|
|
* the tsd_valid_flag will be clear and coordination type
|
|
* will be forecd as DOMAIN_COORD_TYPE_SW_ALL.
|
|
*/
|
|
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) {
|
|
pthrottling->tsd_valid_flag = 0;
|
|
pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL;
|
|
}
|
|
|
|
end:
|
|
kfree(buffer.pointer);
|
|
return result;
|
|
}
|
|
|
|
/* --------------------------------------------------------------------------
|
|
Throttling Control
|
|
-------------------------------------------------------------------------- */
|
|
static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr)
|
|
{
|
|
int state = 0;
|
|
u32 value = 0;
|
|
u32 duty_mask = 0;
|
|
u32 duty_value = 0;
|
|
|
|
if (!pr)
|
|
return -EINVAL;
|
|
|
|
if (!pr->flags.throttling)
|
|
return -ENODEV;
|
|
|
|
/*
|
|
* We don't care about error returns - we just try to mark
|
|
* these reserved so that nobody else is confused into thinking
|
|
* that this region might be unused..
|
|
*
|
|
* (In particular, allocating the IO range for Cardbus)
|
|
*/
|
|
request_region(pr->throttling.address, 6, "ACPI CPU throttle");
|
|
|
|
pr->throttling.state = 0;
|
|
|
|
duty_mask = pr->throttling.state_count - 1;
|
|
|
|
duty_mask <<= pr->throttling.duty_offset;
|
|
|
|
local_irq_disable();
|
|
|
|
value = inl(pr->throttling.address);
|
|
|
|
/*
|
|
* Compute the current throttling state when throttling is enabled
|
|
* (bit 4 is on).
|
|
*/
|
|
if (value & 0x10) {
|
|
duty_value = value & duty_mask;
|
|
duty_value >>= pr->throttling.duty_offset;
|
|
|
|
if (duty_value)
|
|
state = pr->throttling.state_count - duty_value;
|
|
}
|
|
|
|
pr->throttling.state = state;
|
|
|
|
local_irq_enable();
|
|
|
|
acpi_handle_debug(pr->handle,
|
|
"Throttling state is T%d (%d%% throttling applied)\n",
|
|
state, pr->throttling.states[state].performance);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_X86
|
|
static int acpi_throttling_rdmsr(u64 *value)
|
|
{
|
|
u64 msr_high, msr_low;
|
|
u64 msr = 0;
|
|
int ret = -1;
|
|
|
|
if ((this_cpu_read(cpu_info.x86_vendor) != X86_VENDOR_INTEL) ||
|
|
!this_cpu_has(X86_FEATURE_ACPI)) {
|
|
pr_err("HARDWARE addr space,NOT supported yet\n");
|
|
} else {
|
|
msr_low = 0;
|
|
msr_high = 0;
|
|
rdmsr_safe(MSR_IA32_THERM_CONTROL,
|
|
(u32 *)&msr_low, (u32 *) &msr_high);
|
|
msr = (msr_high << 32) | msr_low;
|
|
*value = (u64) msr;
|
|
ret = 0;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int acpi_throttling_wrmsr(u64 value)
|
|
{
|
|
int ret = -1;
|
|
u64 msr;
|
|
|
|
if ((this_cpu_read(cpu_info.x86_vendor) != X86_VENDOR_INTEL) ||
|
|
!this_cpu_has(X86_FEATURE_ACPI)) {
|
|
pr_err("HARDWARE addr space,NOT supported yet\n");
|
|
} else {
|
|
msr = value;
|
|
wrmsr_safe(MSR_IA32_THERM_CONTROL,
|
|
msr & 0xffffffff, msr >> 32);
|
|
ret = 0;
|
|
}
|
|
return ret;
|
|
}
|
|
#else
|
|
static int acpi_throttling_rdmsr(u64 *value)
|
|
{
|
|
pr_err("HARDWARE addr space,NOT supported yet\n");
|
|
return -1;
|
|
}
|
|
|
|
static int acpi_throttling_wrmsr(u64 value)
|
|
{
|
|
pr_err("HARDWARE addr space,NOT supported yet\n");
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
static int acpi_read_throttling_status(struct acpi_processor *pr,
|
|
u64 *value)
|
|
{
|
|
u32 bit_width, bit_offset;
|
|
u32 ptc_value;
|
|
u64 ptc_mask;
|
|
struct acpi_processor_throttling *throttling;
|
|
int ret = -1;
|
|
|
|
throttling = &pr->throttling;
|
|
switch (throttling->status_register.space_id) {
|
|
case ACPI_ADR_SPACE_SYSTEM_IO:
|
|
bit_width = throttling->status_register.bit_width;
|
|
bit_offset = throttling->status_register.bit_offset;
|
|
|
|
acpi_os_read_port((acpi_io_address) throttling->status_register.
|
|
address, &ptc_value,
|
|
(u32) (bit_width + bit_offset));
|
|
ptc_mask = (1 << bit_width) - 1;
|
|
*value = (u64) ((ptc_value >> bit_offset) & ptc_mask);
|
|
ret = 0;
|
|
break;
|
|
case ACPI_ADR_SPACE_FIXED_HARDWARE:
|
|
ret = acpi_throttling_rdmsr(value);
|
|
break;
|
|
default:
|
|
pr_err("Unknown addr space %d\n",
|
|
(u32) (throttling->status_register.space_id));
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int acpi_write_throttling_state(struct acpi_processor *pr,
|
|
u64 value)
|
|
{
|
|
u32 bit_width, bit_offset;
|
|
u64 ptc_value;
|
|
u64 ptc_mask;
|
|
struct acpi_processor_throttling *throttling;
|
|
int ret = -1;
|
|
|
|
throttling = &pr->throttling;
|
|
switch (throttling->control_register.space_id) {
|
|
case ACPI_ADR_SPACE_SYSTEM_IO:
|
|
bit_width = throttling->control_register.bit_width;
|
|
bit_offset = throttling->control_register.bit_offset;
|
|
ptc_mask = (1 << bit_width) - 1;
|
|
ptc_value = value & ptc_mask;
|
|
|
|
acpi_os_write_port((acpi_io_address) throttling->
|
|
control_register.address,
|
|
(u32) (ptc_value << bit_offset),
|
|
(u32) (bit_width + bit_offset));
|
|
ret = 0;
|
|
break;
|
|
case ACPI_ADR_SPACE_FIXED_HARDWARE:
|
|
ret = acpi_throttling_wrmsr(value);
|
|
break;
|
|
default:
|
|
pr_err("Unknown addr space %d\n",
|
|
(u32) (throttling->control_register.space_id));
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int acpi_get_throttling_state(struct acpi_processor *pr,
|
|
u64 value)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < pr->throttling.state_count; i++) {
|
|
struct acpi_processor_tx_tss *tx =
|
|
(struct acpi_processor_tx_tss *)&(pr->throttling.
|
|
states_tss[i]);
|
|
if (tx->control == value)
|
|
return i;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static int acpi_get_throttling_value(struct acpi_processor *pr,
|
|
int state, u64 *value)
|
|
{
|
|
int ret = -1;
|
|
|
|
if (state >= 0 && state <= pr->throttling.state_count) {
|
|
struct acpi_processor_tx_tss *tx =
|
|
(struct acpi_processor_tx_tss *)&(pr->throttling.
|
|
states_tss[state]);
|
|
*value = tx->control;
|
|
ret = 0;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr)
|
|
{
|
|
int state = 0;
|
|
int ret;
|
|
u64 value;
|
|
|
|
if (!pr)
|
|
return -EINVAL;
|
|
|
|
if (!pr->flags.throttling)
|
|
return -ENODEV;
|
|
|
|
pr->throttling.state = 0;
|
|
|
|
value = 0;
|
|
ret = acpi_read_throttling_status(pr, &value);
|
|
if (ret >= 0) {
|
|
state = acpi_get_throttling_state(pr, value);
|
|
if (state == -1) {
|
|
acpi_handle_debug(pr->handle,
|
|
"Invalid throttling state, reset\n");
|
|
state = 0;
|
|
ret = __acpi_processor_set_throttling(pr, state, true,
|
|
true);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
pr->throttling.state = state;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long __acpi_processor_get_throttling(void *data)
|
|
{
|
|
struct acpi_processor *pr = data;
|
|
|
|
return pr->throttling.acpi_processor_get_throttling(pr);
|
|
}
|
|
|
|
static int acpi_processor_get_throttling(struct acpi_processor *pr)
|
|
{
|
|
if (!pr)
|
|
return -EINVAL;
|
|
|
|
if (!pr->flags.throttling)
|
|
return -ENODEV;
|
|
|
|
/*
|
|
* This is either called from the CPU hotplug callback of
|
|
* processor_driver or via the ACPI probe function. In the latter
|
|
* case the CPU is not guaranteed to be online. Both call sites are
|
|
* protected against CPU hotplug.
|
|
*/
|
|
if (!cpu_online(pr->id))
|
|
return -ENODEV;
|
|
|
|
return call_on_cpu(pr->id, __acpi_processor_get_throttling, pr, false);
|
|
}
|
|
|
|
static int acpi_processor_get_fadt_info(struct acpi_processor *pr)
|
|
{
|
|
int i, step;
|
|
|
|
if (!pr->throttling.address) {
|
|
acpi_handle_debug(pr->handle, "No throttling register\n");
|
|
return -EINVAL;
|
|
} else if (!pr->throttling.duty_width) {
|
|
acpi_handle_debug(pr->handle, "No throttling states\n");
|
|
return -EINVAL;
|
|
}
|
|
/* TBD: Support duty_cycle values that span bit 4. */
|
|
else if ((pr->throttling.duty_offset + pr->throttling.duty_width) > 4) {
|
|
pr_warn("duty_cycle spans bit 4\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
pr->throttling.state_count = 1 << acpi_gbl_FADT.duty_width;
|
|
|
|
/*
|
|
* Compute state values. Note that throttling displays a linear power
|
|
* performance relationship (at 50% performance the CPU will consume
|
|
* 50% power). Values are in 1/10th of a percent to preserve accuracy.
|
|
*/
|
|
|
|
step = (1000 / pr->throttling.state_count);
|
|
|
|
for (i = 0; i < pr->throttling.state_count; i++) {
|
|
pr->throttling.states[i].performance = 1000 - step * i;
|
|
pr->throttling.states[i].power = 1000 - step * i;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr,
|
|
int state, bool force)
|
|
{
|
|
u32 value = 0;
|
|
u32 duty_mask = 0;
|
|
u32 duty_value = 0;
|
|
|
|
if (!pr)
|
|
return -EINVAL;
|
|
|
|
if ((state < 0) || (state > (pr->throttling.state_count - 1)))
|
|
return -EINVAL;
|
|
|
|
if (!pr->flags.throttling)
|
|
return -ENODEV;
|
|
|
|
if (!force && (state == pr->throttling.state))
|
|
return 0;
|
|
|
|
if (state < pr->throttling_platform_limit)
|
|
return -EPERM;
|
|
/*
|
|
* Calculate the duty_value and duty_mask.
|
|
*/
|
|
if (state) {
|
|
duty_value = pr->throttling.state_count - state;
|
|
|
|
duty_value <<= pr->throttling.duty_offset;
|
|
|
|
/* Used to clear all duty_value bits */
|
|
duty_mask = pr->throttling.state_count - 1;
|
|
|
|
duty_mask <<= acpi_gbl_FADT.duty_offset;
|
|
duty_mask = ~duty_mask;
|
|
}
|
|
|
|
local_irq_disable();
|
|
|
|
/*
|
|
* Disable throttling by writing a 0 to bit 4. Note that we must
|
|
* turn it off before you can change the duty_value.
|
|
*/
|
|
value = inl(pr->throttling.address);
|
|
if (value & 0x10) {
|
|
value &= 0xFFFFFFEF;
|
|
outl(value, pr->throttling.address);
|
|
}
|
|
|
|
/*
|
|
* Write the new duty_value and then enable throttling. Note
|
|
* that a state value of 0 leaves throttling disabled.
|
|
*/
|
|
if (state) {
|
|
value &= duty_mask;
|
|
value |= duty_value;
|
|
outl(value, pr->throttling.address);
|
|
|
|
value |= 0x00000010;
|
|
outl(value, pr->throttling.address);
|
|
}
|
|
|
|
pr->throttling.state = state;
|
|
|
|
local_irq_enable();
|
|
|
|
acpi_handle_debug(pr->handle,
|
|
"Throttling state set to T%d (%d%%)\n", state,
|
|
(pr->throttling.states[state].performance ? pr->
|
|
throttling.states[state].performance / 10 : 0));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr,
|
|
int state, bool force)
|
|
{
|
|
int ret;
|
|
u64 value;
|
|
|
|
if (!pr)
|
|
return -EINVAL;
|
|
|
|
if ((state < 0) || (state > (pr->throttling.state_count - 1)))
|
|
return -EINVAL;
|
|
|
|
if (!pr->flags.throttling)
|
|
return -ENODEV;
|
|
|
|
if (!force && (state == pr->throttling.state))
|
|
return 0;
|
|
|
|
if (state < pr->throttling_platform_limit)
|
|
return -EPERM;
|
|
|
|
value = 0;
|
|
ret = acpi_get_throttling_value(pr, state, &value);
|
|
if (ret >= 0) {
|
|
acpi_write_throttling_state(pr, value);
|
|
pr->throttling.state = state;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long acpi_processor_throttling_fn(void *data)
|
|
{
|
|
struct acpi_processor_throttling_arg *arg = data;
|
|
struct acpi_processor *pr = arg->pr;
|
|
|
|
return pr->throttling.acpi_processor_set_throttling(pr,
|
|
arg->target_state, arg->force);
|
|
}
|
|
|
|
static int __acpi_processor_set_throttling(struct acpi_processor *pr,
|
|
int state, bool force, bool direct)
|
|
{
|
|
int ret = 0;
|
|
unsigned int i;
|
|
struct acpi_processor *match_pr;
|
|
struct acpi_processor_throttling *p_throttling;
|
|
struct acpi_processor_throttling_arg arg;
|
|
struct throttling_tstate t_state;
|
|
|
|
if (!pr)
|
|
return -EINVAL;
|
|
|
|
if (!pr->flags.throttling)
|
|
return -ENODEV;
|
|
|
|
if ((state < 0) || (state > (pr->throttling.state_count - 1)))
|
|
return -EINVAL;
|
|
|
|
if (cpu_is_offline(pr->id)) {
|
|
/*
|
|
* the cpu pointed by pr->id is offline. Unnecessary to change
|
|
* the throttling state any more.
|
|
*/
|
|
return -ENODEV;
|
|
}
|
|
|
|
t_state.target_state = state;
|
|
p_throttling = &(pr->throttling);
|
|
|
|
/*
|
|
* The throttling notifier will be called for every
|
|
* affected cpu in order to get one proper T-state.
|
|
* The notifier event is THROTTLING_PRECHANGE.
|
|
*/
|
|
for_each_cpu_and(i, cpu_online_mask, p_throttling->shared_cpu_map) {
|
|
t_state.cpu = i;
|
|
acpi_processor_throttling_notifier(THROTTLING_PRECHANGE,
|
|
&t_state);
|
|
}
|
|
/*
|
|
* The function of acpi_processor_set_throttling will be called
|
|
* to switch T-state. If the coordination type is SW_ALL or HW_ALL,
|
|
* it is necessary to call it for every affected cpu. Otherwise
|
|
* it can be called only for the cpu pointed by pr.
|
|
*/
|
|
if (p_throttling->shared_type == DOMAIN_COORD_TYPE_SW_ANY) {
|
|
arg.pr = pr;
|
|
arg.target_state = state;
|
|
arg.force = force;
|
|
ret = call_on_cpu(pr->id, acpi_processor_throttling_fn, &arg,
|
|
direct);
|
|
} else {
|
|
/*
|
|
* When the T-state coordination is SW_ALL or HW_ALL,
|
|
* it is necessary to set T-state for every affected
|
|
* cpus.
|
|
*/
|
|
for_each_cpu_and(i, cpu_online_mask,
|
|
p_throttling->shared_cpu_map) {
|
|
match_pr = per_cpu(processors, i);
|
|
/*
|
|
* If the pointer is invalid, we will report the
|
|
* error message and continue.
|
|
*/
|
|
if (!match_pr) {
|
|
acpi_handle_debug(pr->handle,
|
|
"Invalid Pointer for CPU %d\n", i);
|
|
continue;
|
|
}
|
|
/*
|
|
* If the throttling control is unsupported on CPU i,
|
|
* we will report the error message and continue.
|
|
*/
|
|
if (!match_pr->flags.throttling) {
|
|
acpi_handle_debug(pr->handle,
|
|
"Throttling Control unsupported on CPU %d\n", i);
|
|
continue;
|
|
}
|
|
|
|
arg.pr = match_pr;
|
|
arg.target_state = state;
|
|
arg.force = force;
|
|
ret = call_on_cpu(pr->id, acpi_processor_throttling_fn,
|
|
&arg, direct);
|
|
}
|
|
}
|
|
/*
|
|
* After the set_throttling is called, the
|
|
* throttling notifier is called for every
|
|
* affected cpu to update the T-states.
|
|
* The notifier event is THROTTLING_POSTCHANGE
|
|
*/
|
|
for_each_cpu_and(i, cpu_online_mask, p_throttling->shared_cpu_map) {
|
|
t_state.cpu = i;
|
|
acpi_processor_throttling_notifier(THROTTLING_POSTCHANGE,
|
|
&t_state);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int acpi_processor_set_throttling(struct acpi_processor *pr, int state,
|
|
bool force)
|
|
{
|
|
return __acpi_processor_set_throttling(pr, state, force, false);
|
|
}
|
|
|
|
int acpi_processor_get_throttling_info(struct acpi_processor *pr)
|
|
{
|
|
int result = 0;
|
|
struct acpi_processor_throttling *pthrottling;
|
|
|
|
acpi_handle_debug(pr->handle,
|
|
"pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n",
|
|
pr->throttling.address,
|
|
pr->throttling.duty_offset,
|
|
pr->throttling.duty_width);
|
|
|
|
/*
|
|
* Evaluate _PTC, _TSS and _TPC
|
|
* They must all be present or none of them can be used.
|
|
*/
|
|
if (acpi_processor_get_throttling_control(pr) ||
|
|
acpi_processor_get_throttling_states(pr) ||
|
|
acpi_processor_get_platform_limit(pr)) {
|
|
pr->throttling.acpi_processor_get_throttling =
|
|
&acpi_processor_get_throttling_fadt;
|
|
pr->throttling.acpi_processor_set_throttling =
|
|
&acpi_processor_set_throttling_fadt;
|
|
if (acpi_processor_get_fadt_info(pr))
|
|
return 0;
|
|
} else {
|
|
pr->throttling.acpi_processor_get_throttling =
|
|
&acpi_processor_get_throttling_ptc;
|
|
pr->throttling.acpi_processor_set_throttling =
|
|
&acpi_processor_set_throttling_ptc;
|
|
}
|
|
|
|
/*
|
|
* If TSD package for one CPU can't be parsed successfully, it means
|
|
* that this CPU will have no coordination with other CPUs.
|
|
*/
|
|
if (acpi_processor_get_tsd(pr)) {
|
|
pthrottling = &pr->throttling;
|
|
pthrottling->tsd_valid_flag = 0;
|
|
cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map);
|
|
pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL;
|
|
}
|
|
|
|
/*
|
|
* PIIX4 Errata: We don't support throttling on the original PIIX4.
|
|
* This shouldn't be an issue as few (if any) mobile systems ever
|
|
* used this part.
|
|
*/
|
|
if (errata.piix4.throttle) {
|
|
acpi_handle_debug(pr->handle,
|
|
"Throttling not supported on PIIX4 A- or B-step\n");
|
|
return 0;
|
|
}
|
|
|
|
acpi_handle_debug(pr->handle, "Found %d throttling states\n",
|
|
pr->throttling.state_count);
|
|
|
|
pr->flags.throttling = 1;
|
|
|
|
/*
|
|
* Disable throttling (if enabled). We'll let subsequent policy (e.g.
|
|
* thermal) decide to lower performance if it so chooses, but for now
|
|
* we'll crank up the speed.
|
|
*/
|
|
|
|
result = acpi_processor_get_throttling(pr);
|
|
if (result)
|
|
goto end;
|
|
|
|
if (pr->throttling.state) {
|
|
acpi_handle_debug(pr->handle,
|
|
"Disabling throttling (was T%d)\n",
|
|
pr->throttling.state);
|
|
result = acpi_processor_set_throttling(pr, 0, false);
|
|
if (result)
|
|
goto end;
|
|
}
|
|
|
|
end:
|
|
if (result)
|
|
pr->flags.throttling = 0;
|
|
|
|
return result;
|
|
}
|
|
|