mirror of https://gitee.com/openkylin/linux.git
1262 lines
32 KiB
C
1262 lines
32 KiB
C
/*
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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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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/kernel.h>
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#include <linux/module.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/proc_fs.h>
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#include <linux/seq_file.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/processor.h>
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#define ACPI_PROCESSOR_COMPONENT 0x01000000
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#define ACPI_PROCESSOR_CLASS "processor"
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#define _COMPONENT ACPI_PROCESSOR_COMPONENT
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ACPI_MODULE_NAME("processor_throttling");
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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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#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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int acpi_processor_set_throttling(struct acpi_processor *pr, int state);
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static int acpi_processor_update_tsd_coord(void)
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{
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int count, count_target;
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int retval = 0;
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unsigned int i, j;
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cpumask_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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/*
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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 = 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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cpus_clear(covered_cpus);
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for_each_possible_cpu(i) {
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pr = processors[i];
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if (!pr)
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continue;
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if (cpu_isset(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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cpu_set(i, pthrottling->shared_cpu_map);
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cpu_set(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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count = 1;
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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 = 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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cpu_set(j, covered_cpus);
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cpu_set(j, pthrottling->shared_cpu_map);
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count++;
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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 = 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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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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for_each_possible_cpu(i) {
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pr = 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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cpus_clear(pthrottling->shared_cpu_map);
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cpu_set(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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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Assume no T-state coordination\n"));
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return;
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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 = processors[cpu];
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if (!pr) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "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_DEBUG_PRINT((ACPI_DB_INFO, "Throttling control is "
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"unsupported on CPU %d\n", 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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printk(KERN_WARNING
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"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_DEBUG_PRINT((ACPI_DB_INFO, "PreChange Event:"
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"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_DEBUG_PRINT((ACPI_DB_INFO, "PostChange Event:"
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"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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printk(KERN_WARNING
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"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 tpc = 0;
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if (!pr)
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return -EINVAL;
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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_EXCEPTION((AE_INFO, status, "Evaluating _TPC"));
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}
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return -ENODEV;
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}
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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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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);
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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 = { 0 };
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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_EXCEPTION((AE_INFO, status, "Evaluating _PTC"));
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}
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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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printk(KERN_ERR PREFIX "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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* 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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printk(KERN_ERR PREFIX
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"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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* status_register
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*/
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obj = ptc->package.elements[1];
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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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printk(KERN_ERR PREFIX "Invalid _PTC data (status_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.status_register, obj.buffer.pointer,
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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) {
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printk(KERN_ERR PREFIX "Invalid _PTC control register\n");
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result = -EFAULT;
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goto end;
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}
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if ((throttling->status_register.bit_width +
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throttling->status_register.bit_offset) > 32) {
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printk(KERN_ERR PREFIX "Invalid _PTC status register\n");
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result = -EFAULT;
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goto end;
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}
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end:
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kfree(buffer.pointer);
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return result;
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}
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|
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/*
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* _TSS - Throttling Supported States
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*/
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static int acpi_processor_get_throttling_states(struct acpi_processor *pr)
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{
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int result = 0;
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acpi_status status = AE_OK;
|
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
|
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struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" };
|
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struct acpi_buffer state = { 0, NULL };
|
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union acpi_object *tss = NULL;
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int i;
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|
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status = acpi_evaluate_object(pr->handle, "_TSS", NULL, &buffer);
|
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if (ACPI_FAILURE(status)) {
|
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if (status != AE_NOT_FOUND) {
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ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSS"));
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}
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return -ENODEV;
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}
|
|
|
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tss = buffer.pointer;
|
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if (!tss || (tss->type != ACPI_TYPE_PACKAGE)) {
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printk(KERN_ERR PREFIX "Invalid _TSS data\n");
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result = -EFAULT;
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goto end;
|
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}
|
|
|
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n",
|
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tss->package.count));
|
|
|
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pr->throttling.state_count = tss->package.count;
|
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pr->throttling.states_tss =
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kmalloc(sizeof(struct acpi_processor_tx_tss) * tss->package.count,
|
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GFP_KERNEL);
|
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if (!pr->throttling.states_tss) {
|
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result = -ENOMEM;
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goto end;
|
|
}
|
|
|
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for (i = 0; i < pr->throttling.state_count; i++) {
|
|
|
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struct acpi_processor_tx_tss *tx =
|
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(struct acpi_processor_tx_tss *)&(pr->throttling.
|
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states_tss[i]);
|
|
|
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state.length = sizeof(struct acpi_processor_tx_tss);
|
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state.pointer = tx;
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
|
|
|
|
status = acpi_extract_package(&(tss->package.elements[i]),
|
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&format, &state);
|
|
if (ACPI_FAILURE(status)) {
|
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ACPI_EXCEPTION((AE_INFO, status, "Invalid _TSS data"));
|
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result = -EFAULT;
|
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kfree(pr->throttling.states_tss);
|
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goto end;
|
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}
|
|
|
|
if (!tx->freqpercentage) {
|
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printk(KERN_ERR PREFIX
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"Invalid _TSS data: freq is zero\n");
|
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result = -EFAULT;
|
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kfree(pr->throttling.states_tss);
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goto end;
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}
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}
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|
|
|
end:
|
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kfree(buffer.pointer);
|
|
|
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return result;
|
|
}
|
|
|
|
/*
|
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* _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;
|
|
|
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pthrottling = &pr->throttling;
|
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pthrottling->tsd_valid_flag = 0;
|
|
|
|
status = acpi_evaluate_object(pr->handle, "_TSD", NULL, &buffer);
|
|
if (ACPI_FAILURE(status)) {
|
|
if (status != AE_NOT_FOUND) {
|
|
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSD"));
|
|
}
|
|
return -ENODEV;
|
|
}
|
|
|
|
tsd = buffer.pointer;
|
|
if (!tsd || (tsd->type != ACPI_TYPE_PACKAGE)) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _TSD data\n"));
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
if (tsd->package.count != 1) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "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)) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _TSD data\n"));
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
if (pdomain->num_entries != ACPI_TSD_REV0_ENTRIES) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _TSD:num_entries\n"));
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
if (pdomain->revision != ACPI_TSD_REV0_REVISION) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _TSD:revision\n"));
|
|
result = -EFAULT;
|
|
goto end;
|
|
}
|
|
|
|
pthrottling = &pr->throttling;
|
|
pthrottling->tsd_valid_flag = 1;
|
|
pthrottling->shared_type = pdomain->coord_type;
|
|
cpu_set(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;
|
|
|
|
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_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"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(struct acpi_processor *pr,
|
|
acpi_integer * value)
|
|
{
|
|
struct cpuinfo_x86 *c;
|
|
u64 msr_high, msr_low;
|
|
unsigned int cpu;
|
|
u64 msr = 0;
|
|
int ret = -1;
|
|
|
|
cpu = pr->id;
|
|
c = &cpu_data(cpu);
|
|
|
|
if ((c->x86_vendor != X86_VENDOR_INTEL) ||
|
|
!cpu_has(c, X86_FEATURE_ACPI)) {
|
|
printk(KERN_ERR PREFIX
|
|
"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 = (acpi_integer) msr;
|
|
ret = 0;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int acpi_throttling_wrmsr(struct acpi_processor *pr, acpi_integer value)
|
|
{
|
|
struct cpuinfo_x86 *c;
|
|
unsigned int cpu;
|
|
int ret = -1;
|
|
u64 msr;
|
|
|
|
cpu = pr->id;
|
|
c = &cpu_data(cpu);
|
|
|
|
if ((c->x86_vendor != X86_VENDOR_INTEL) ||
|
|
!cpu_has(c, X86_FEATURE_ACPI)) {
|
|
printk(KERN_ERR PREFIX
|
|
"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(struct acpi_processor *pr,
|
|
acpi_integer * value)
|
|
{
|
|
printk(KERN_ERR PREFIX
|
|
"HARDWARE addr space,NOT supported yet\n");
|
|
return -1;
|
|
}
|
|
|
|
static int acpi_throttling_wrmsr(struct acpi_processor *pr, acpi_integer value)
|
|
{
|
|
printk(KERN_ERR PREFIX
|
|
"HARDWARE addr space,NOT supported yet\n");
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
static int acpi_read_throttling_status(struct acpi_processor *pr,
|
|
acpi_integer *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->status_register.space_id) {
|
|
case ACPI_ADR_SPACE_SYSTEM_IO:
|
|
ptc_value = 0;
|
|
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, (u32 *) &ptc_value,
|
|
(u32) (bit_width + bit_offset));
|
|
ptc_mask = (1 << bit_width) - 1;
|
|
*value = (acpi_integer) ((ptc_value >> bit_offset) & ptc_mask);
|
|
ret = 0;
|
|
break;
|
|
case ACPI_ADR_SPACE_FIXED_HARDWARE:
|
|
ret = acpi_throttling_rdmsr(pr, value);
|
|
break;
|
|
default:
|
|
printk(KERN_ERR PREFIX "Unknown addr space %d\n",
|
|
(u32) (throttling->status_register.space_id));
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int acpi_write_throttling_state(struct acpi_processor *pr,
|
|
acpi_integer 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(pr, value);
|
|
break;
|
|
default:
|
|
printk(KERN_ERR PREFIX "Unknown addr space %d\n",
|
|
(u32) (throttling->control_register.space_id));
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int acpi_get_throttling_state(struct acpi_processor *pr,
|
|
acpi_integer 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)
|
|
break;
|
|
}
|
|
if (i > pr->throttling.state_count)
|
|
i = -1;
|
|
return i;
|
|
}
|
|
|
|
static int acpi_get_throttling_value(struct acpi_processor *pr,
|
|
int state, acpi_integer *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;
|
|
acpi_integer 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);
|
|
pr->throttling.state = state;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_processor_get_throttling(struct acpi_processor *pr)
|
|
{
|
|
cpumask_t saved_mask;
|
|
int ret;
|
|
|
|
if (!pr)
|
|
return -EINVAL;
|
|
|
|
if (!pr->flags.throttling)
|
|
return -ENODEV;
|
|
/*
|
|
* Migrate task to the cpu pointed by pr.
|
|
*/
|
|
saved_mask = current->cpus_allowed;
|
|
set_cpus_allowed_ptr(current, &cpumask_of_cpu(pr->id));
|
|
ret = pr->throttling.acpi_processor_get_throttling(pr);
|
|
/* restore the previous state */
|
|
set_cpus_allowed_ptr(current, &saved_mask);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int acpi_processor_get_fadt_info(struct acpi_processor *pr)
|
|
{
|
|
int i, step;
|
|
|
|
if (!pr->throttling.address) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n"));
|
|
return -EINVAL;
|
|
} else if (!pr->throttling.duty_width) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "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) {
|
|
printk(KERN_WARNING PREFIX "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)
|
|
{
|
|
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 (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_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"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)
|
|
{
|
|
int ret;
|
|
acpi_integer value;
|
|
|
|
if (!pr)
|
|
return -EINVAL;
|
|
|
|
if ((state < 0) || (state > (pr->throttling.state_count - 1)))
|
|
return -EINVAL;
|
|
|
|
if (!pr->flags.throttling)
|
|
return -ENODEV;
|
|
|
|
if (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;
|
|
}
|
|
|
|
int acpi_processor_set_throttling(struct acpi_processor *pr, int state)
|
|
{
|
|
cpumask_t saved_mask;
|
|
int ret = 0;
|
|
unsigned int i;
|
|
struct acpi_processor *match_pr;
|
|
struct acpi_processor_throttling *p_throttling;
|
|
struct throttling_tstate t_state;
|
|
cpumask_t online_throttling_cpus;
|
|
|
|
if (!pr)
|
|
return -EINVAL;
|
|
|
|
if (!pr->flags.throttling)
|
|
return -ENODEV;
|
|
|
|
if ((state < 0) || (state > (pr->throttling.state_count - 1)))
|
|
return -EINVAL;
|
|
|
|
saved_mask = current->cpus_allowed;
|
|
t_state.target_state = state;
|
|
p_throttling = &(pr->throttling);
|
|
cpus_and(online_throttling_cpus, cpu_online_map,
|
|
p_throttling->shared_cpu_map);
|
|
/*
|
|
* 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_mask(i, online_throttling_cpus) {
|
|
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) {
|
|
set_cpus_allowed_ptr(current, &cpumask_of_cpu(pr->id));
|
|
ret = p_throttling->acpi_processor_set_throttling(pr,
|
|
t_state.target_state);
|
|
} 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_mask(i, online_throttling_cpus) {
|
|
match_pr = processors[i];
|
|
/*
|
|
* If the pointer is invalid, we will report the
|
|
* error message and continue.
|
|
*/
|
|
if (!match_pr) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"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_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"Throttling Controll is unsupported "
|
|
"on CPU %d\n", i));
|
|
continue;
|
|
}
|
|
t_state.cpu = i;
|
|
set_cpus_allowed_ptr(current, &cpumask_of_cpu(i));
|
|
ret = match_pr->throttling.
|
|
acpi_processor_set_throttling(
|
|
match_pr, t_state.target_state);
|
|
}
|
|
}
|
|
/*
|
|
* 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_mask(i, online_throttling_cpus) {
|
|
t_state.cpu = i;
|
|
acpi_processor_throttling_notifier(THROTTLING_POSTCHANGE,
|
|
&t_state);
|
|
}
|
|
/* restore the previous state */
|
|
set_cpus_allowed_ptr(current, &saved_mask);
|
|
return ret;
|
|
}
|
|
|
|
int acpi_processor_get_throttling_info(struct acpi_processor *pr)
|
|
{
|
|
int result = 0;
|
|
struct acpi_processor_throttling *pthrottling;
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n",
|
|
pr->throttling.address,
|
|
pr->throttling.duty_offset,
|
|
pr->throttling.duty_width));
|
|
|
|
if (!pr)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* 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;
|
|
cpu_set(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_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"Throttling not supported on PIIX4 A- or B-step\n"));
|
|
return 0;
|
|
}
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "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_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"Disabling throttling (was T%d)\n",
|
|
pr->throttling.state));
|
|
result = acpi_processor_set_throttling(pr, 0);
|
|
if (result)
|
|
goto end;
|
|
}
|
|
|
|
end:
|
|
if (result)
|
|
pr->flags.throttling = 0;
|
|
|
|
return result;
|
|
}
|
|
|
|
/* proc interface */
|
|
|
|
static int acpi_processor_throttling_seq_show(struct seq_file *seq,
|
|
void *offset)
|
|
{
|
|
struct acpi_processor *pr = seq->private;
|
|
int i = 0;
|
|
int result = 0;
|
|
|
|
if (!pr)
|
|
goto end;
|
|
|
|
if (!(pr->throttling.state_count > 0)) {
|
|
seq_puts(seq, "<not supported>\n");
|
|
goto end;
|
|
}
|
|
|
|
result = acpi_processor_get_throttling(pr);
|
|
|
|
if (result) {
|
|
seq_puts(seq,
|
|
"Could not determine current throttling state.\n");
|
|
goto end;
|
|
}
|
|
|
|
seq_printf(seq, "state count: %d\n"
|
|
"active state: T%d\n"
|
|
"state available: T%d to T%d\n",
|
|
pr->throttling.state_count, pr->throttling.state,
|
|
pr->throttling_platform_limit,
|
|
pr->throttling.state_count - 1);
|
|
|
|
seq_puts(seq, "states:\n");
|
|
if (pr->throttling.acpi_processor_get_throttling ==
|
|
acpi_processor_get_throttling_fadt) {
|
|
for (i = 0; i < pr->throttling.state_count; i++)
|
|
seq_printf(seq, " %cT%d: %02d%%\n",
|
|
(i == pr->throttling.state ? '*' : ' '), i,
|
|
(pr->throttling.states[i].performance ? pr->
|
|
throttling.states[i].performance / 10 : 0));
|
|
} else {
|
|
for (i = 0; i < pr->throttling.state_count; i++)
|
|
seq_printf(seq, " %cT%d: %02d%%\n",
|
|
(i == pr->throttling.state ? '*' : ' '), i,
|
|
(int)pr->throttling.states_tss[i].
|
|
freqpercentage);
|
|
}
|
|
|
|
end:
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_processor_throttling_open_fs(struct inode *inode,
|
|
struct file *file)
|
|
{
|
|
return single_open(file, acpi_processor_throttling_seq_show,
|
|
PDE(inode)->data);
|
|
}
|
|
|
|
static ssize_t acpi_processor_write_throttling(struct file *file,
|
|
const char __user * buffer,
|
|
size_t count, loff_t * data)
|
|
{
|
|
int result = 0;
|
|
struct seq_file *m = file->private_data;
|
|
struct acpi_processor *pr = m->private;
|
|
char state_string[12] = { '\0' };
|
|
|
|
if (!pr || (count > sizeof(state_string) - 1))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(state_string, buffer, count))
|
|
return -EFAULT;
|
|
|
|
state_string[count] = '\0';
|
|
|
|
result = acpi_processor_set_throttling(pr,
|
|
simple_strtoul(state_string,
|
|
NULL, 0));
|
|
if (result)
|
|
return result;
|
|
|
|
return count;
|
|
}
|
|
|
|
struct file_operations acpi_processor_throttling_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = acpi_processor_throttling_open_fs,
|
|
.read = seq_read,
|
|
.write = acpi_processor_write_throttling,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|