![Guillaume Chazarain](/assets/img/avatar_default.png)
cmd.val was used uninitialized on the line below. Signed-off-by: Guillaume Chazarain <guichaz@yahoo.fr> Acked-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
816 lines
20 KiB
C
816 lines
20 KiB
C
/*
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* acpi-cpufreq.c - ACPI Processor P-States Driver ($Revision: 1.4 $)
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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) 2002 - 2004 Dominik Brodowski <linux@brodo.de>
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* Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com>
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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/smp.h>
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#include <linux/sched.h>
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#include <linux/cpufreq.h>
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#include <linux/compiler.h>
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#include <linux/dmi.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 <asm/msr.h>
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#include <asm/processor.h>
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#include <asm/cpufeature.h>
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#include <asm/delay.h>
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#include <asm/uaccess.h>
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#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "acpi-cpufreq", msg)
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MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski");
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MODULE_DESCRIPTION("ACPI Processor P-States Driver");
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MODULE_LICENSE("GPL");
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enum {
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UNDEFINED_CAPABLE = 0,
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SYSTEM_INTEL_MSR_CAPABLE,
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SYSTEM_IO_CAPABLE,
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};
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#define INTEL_MSR_RANGE (0xffff)
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#define CPUID_6_ECX_APERFMPERF_CAPABILITY (0x1)
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struct acpi_cpufreq_data {
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struct acpi_processor_performance *acpi_data;
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struct cpufreq_frequency_table *freq_table;
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unsigned int max_freq;
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unsigned int resume;
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unsigned int cpu_feature;
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};
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static struct acpi_cpufreq_data *drv_data[NR_CPUS];
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static struct acpi_processor_performance *acpi_perf_data[NR_CPUS];
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static struct cpufreq_driver acpi_cpufreq_driver;
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static unsigned int acpi_pstate_strict;
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static int check_est_cpu(unsigned int cpuid)
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{
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struct cpuinfo_x86 *cpu = &cpu_data[cpuid];
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if (cpu->x86_vendor != X86_VENDOR_INTEL ||
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!cpu_has(cpu, X86_FEATURE_EST))
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return 0;
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return 1;
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}
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static unsigned extract_io(u32 value, struct acpi_cpufreq_data *data)
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{
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struct acpi_processor_performance *perf;
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int i;
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perf = data->acpi_data;
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for (i=0; i<perf->state_count; i++) {
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if (value == perf->states[i].status)
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return data->freq_table[i].frequency;
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}
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return 0;
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}
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static unsigned extract_msr(u32 msr, struct acpi_cpufreq_data *data)
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{
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int i;
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struct acpi_processor_performance *perf;
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msr &= INTEL_MSR_RANGE;
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perf = data->acpi_data;
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for (i=0; data->freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
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if (msr == perf->states[data->freq_table[i].index].status)
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return data->freq_table[i].frequency;
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}
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return data->freq_table[0].frequency;
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}
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static unsigned extract_freq(u32 val, struct acpi_cpufreq_data *data)
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{
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switch (data->cpu_feature) {
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case SYSTEM_INTEL_MSR_CAPABLE:
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return extract_msr(val, data);
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case SYSTEM_IO_CAPABLE:
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return extract_io(val, data);
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default:
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return 0;
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}
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}
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struct msr_addr {
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u32 reg;
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};
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struct io_addr {
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u16 port;
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u8 bit_width;
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};
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typedef union {
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struct msr_addr msr;
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struct io_addr io;
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} drv_addr_union;
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struct drv_cmd {
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unsigned int type;
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cpumask_t mask;
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drv_addr_union addr;
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u32 val;
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};
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static void do_drv_read(struct drv_cmd *cmd)
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{
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u32 h;
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switch (cmd->type) {
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case SYSTEM_INTEL_MSR_CAPABLE:
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rdmsr(cmd->addr.msr.reg, cmd->val, h);
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break;
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case SYSTEM_IO_CAPABLE:
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acpi_os_read_port((acpi_io_address)cmd->addr.io.port,
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&cmd->val,
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(u32)cmd->addr.io.bit_width);
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break;
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default:
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break;
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}
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}
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static void do_drv_write(struct drv_cmd *cmd)
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{
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u32 h = 0;
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switch (cmd->type) {
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case SYSTEM_INTEL_MSR_CAPABLE:
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wrmsr(cmd->addr.msr.reg, cmd->val, h);
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break;
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case SYSTEM_IO_CAPABLE:
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acpi_os_write_port((acpi_io_address)cmd->addr.io.port,
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cmd->val,
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(u32)cmd->addr.io.bit_width);
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break;
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default:
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break;
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}
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}
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static void drv_read(struct drv_cmd *cmd)
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{
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cpumask_t saved_mask = current->cpus_allowed;
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cmd->val = 0;
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set_cpus_allowed(current, cmd->mask);
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do_drv_read(cmd);
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set_cpus_allowed(current, saved_mask);
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}
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static void drv_write(struct drv_cmd *cmd)
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{
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cpumask_t saved_mask = current->cpus_allowed;
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unsigned int i;
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for_each_cpu_mask(i, cmd->mask) {
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set_cpus_allowed(current, cpumask_of_cpu(i));
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do_drv_write(cmd);
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}
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set_cpus_allowed(current, saved_mask);
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return;
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}
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static u32 get_cur_val(cpumask_t mask)
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{
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struct acpi_processor_performance *perf;
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struct drv_cmd cmd;
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if (unlikely(cpus_empty(mask)))
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return 0;
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switch (drv_data[first_cpu(mask)]->cpu_feature) {
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case SYSTEM_INTEL_MSR_CAPABLE:
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cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
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cmd.addr.msr.reg = MSR_IA32_PERF_STATUS;
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break;
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case SYSTEM_IO_CAPABLE:
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cmd.type = SYSTEM_IO_CAPABLE;
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perf = drv_data[first_cpu(mask)]->acpi_data;
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cmd.addr.io.port = perf->control_register.address;
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cmd.addr.io.bit_width = perf->control_register.bit_width;
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break;
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default:
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return 0;
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}
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cmd.mask = mask;
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drv_read(&cmd);
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dprintk("get_cur_val = %u\n", cmd.val);
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return cmd.val;
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}
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/*
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* Return the measured active (C0) frequency on this CPU since last call
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* to this function.
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* Input: cpu number
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* Return: Average CPU frequency in terms of max frequency (zero on error)
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*
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* We use IA32_MPERF and IA32_APERF MSRs to get the measured performance
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* over a period of time, while CPU is in C0 state.
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* IA32_MPERF counts at the rate of max advertised frequency
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* IA32_APERF counts at the rate of actual CPU frequency
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* Only IA32_APERF/IA32_MPERF ratio is architecturally defined and
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* no meaning should be associated with absolute values of these MSRs.
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*/
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static unsigned int get_measured_perf(unsigned int cpu)
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{
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union {
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struct {
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u32 lo;
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u32 hi;
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} split;
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u64 whole;
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} aperf_cur, mperf_cur;
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cpumask_t saved_mask;
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unsigned int perf_percent;
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unsigned int retval;
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saved_mask = current->cpus_allowed;
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set_cpus_allowed(current, cpumask_of_cpu(cpu));
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if (get_cpu() != cpu) {
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/* We were not able to run on requested processor */
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put_cpu();
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return 0;
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}
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rdmsr(MSR_IA32_APERF, aperf_cur.split.lo, aperf_cur.split.hi);
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rdmsr(MSR_IA32_MPERF, mperf_cur.split.lo, mperf_cur.split.hi);
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wrmsr(MSR_IA32_APERF, 0,0);
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wrmsr(MSR_IA32_MPERF, 0,0);
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#ifdef __i386__
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/*
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* We dont want to do 64 bit divide with 32 bit kernel
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* Get an approximate value. Return failure in case we cannot get
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* an approximate value.
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*/
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if (unlikely(aperf_cur.split.hi || mperf_cur.split.hi)) {
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int shift_count;
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u32 h;
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h = max_t(u32, aperf_cur.split.hi, mperf_cur.split.hi);
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shift_count = fls(h);
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aperf_cur.whole >>= shift_count;
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mperf_cur.whole >>= shift_count;
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}
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if (((unsigned long)(-1) / 100) < aperf_cur.split.lo) {
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int shift_count = 7;
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aperf_cur.split.lo >>= shift_count;
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mperf_cur.split.lo >>= shift_count;
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}
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if (aperf_cur.split.lo && mperf_cur.split.lo)
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perf_percent = (aperf_cur.split.lo * 100) / mperf_cur.split.lo;
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else
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perf_percent = 0;
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#else
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if (unlikely(((unsigned long)(-1) / 100) < aperf_cur.whole)) {
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int shift_count = 7;
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aperf_cur.whole >>= shift_count;
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mperf_cur.whole >>= shift_count;
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}
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if (aperf_cur.whole && mperf_cur.whole)
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perf_percent = (aperf_cur.whole * 100) / mperf_cur.whole;
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else
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perf_percent = 0;
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#endif
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retval = drv_data[cpu]->max_freq * perf_percent / 100;
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put_cpu();
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set_cpus_allowed(current, saved_mask);
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dprintk("cpu %d: performance percent %d\n", cpu, perf_percent);
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return retval;
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}
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static unsigned int get_cur_freq_on_cpu(unsigned int cpu)
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{
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struct acpi_cpufreq_data *data = drv_data[cpu];
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unsigned int freq;
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dprintk("get_cur_freq_on_cpu (%d)\n", cpu);
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if (unlikely(data == NULL ||
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data->acpi_data == NULL || data->freq_table == NULL)) {
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return 0;
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}
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freq = extract_freq(get_cur_val(cpumask_of_cpu(cpu)), data);
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dprintk("cur freq = %u\n", freq);
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return freq;
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}
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static unsigned int check_freqs(cpumask_t mask, unsigned int freq,
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struct acpi_cpufreq_data *data)
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{
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unsigned int cur_freq;
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unsigned int i;
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for (i=0; i<100; i++) {
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cur_freq = extract_freq(get_cur_val(mask), data);
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if (cur_freq == freq)
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return 1;
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udelay(10);
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}
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return 0;
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}
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static int acpi_cpufreq_target(struct cpufreq_policy *policy,
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unsigned int target_freq, unsigned int relation)
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{
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struct acpi_cpufreq_data *data = drv_data[policy->cpu];
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struct acpi_processor_performance *perf;
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struct cpufreq_freqs freqs;
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cpumask_t online_policy_cpus;
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struct drv_cmd cmd;
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unsigned int msr;
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unsigned int next_state = 0; /* Index into freq_table */
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unsigned int next_perf_state = 0; /* Index into perf table */
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unsigned int i;
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int result = 0;
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dprintk("acpi_cpufreq_target %d (%d)\n", target_freq, policy->cpu);
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if (unlikely(data == NULL ||
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data->acpi_data == NULL || data->freq_table == NULL)) {
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return -ENODEV;
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}
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perf = data->acpi_data;
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result = cpufreq_frequency_table_target(policy,
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data->freq_table,
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target_freq,
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relation, &next_state);
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if (unlikely(result))
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return -ENODEV;
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#ifdef CONFIG_HOTPLUG_CPU
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/* cpufreq holds the hotplug lock, so we are safe from here on */
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cpus_and(online_policy_cpus, cpu_online_map, policy->cpus);
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#else
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online_policy_cpus = policy->cpus;
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#endif
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next_perf_state = data->freq_table[next_state].index;
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if (perf->state == next_perf_state) {
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if (unlikely(data->resume)) {
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dprintk("Called after resume, resetting to P%d\n",
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next_perf_state);
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data->resume = 0;
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} else {
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dprintk("Already at target state (P%d)\n",
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next_perf_state);
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return 0;
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}
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}
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switch (data->cpu_feature) {
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case SYSTEM_INTEL_MSR_CAPABLE:
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cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
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cmd.addr.msr.reg = MSR_IA32_PERF_CTL;
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msr =
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(u32) perf->states[next_perf_state].
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control & INTEL_MSR_RANGE;
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cmd.val = get_cur_val(online_policy_cpus);
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cmd.val = (cmd.val & ~INTEL_MSR_RANGE) | msr;
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break;
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case SYSTEM_IO_CAPABLE:
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cmd.type = SYSTEM_IO_CAPABLE;
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cmd.addr.io.port = perf->control_register.address;
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cmd.addr.io.bit_width = perf->control_register.bit_width;
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cmd.val = (u32) perf->states[next_perf_state].control;
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break;
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default:
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return -ENODEV;
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}
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cpus_clear(cmd.mask);
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if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY)
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cmd.mask = online_policy_cpus;
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else
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cpu_set(policy->cpu, cmd.mask);
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freqs.old = perf->states[perf->state].core_frequency * 1000;
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freqs.new = data->freq_table[next_state].frequency;
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for_each_cpu_mask(i, cmd.mask) {
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freqs.cpu = i;
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cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
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}
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drv_write(&cmd);
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if (acpi_pstate_strict) {
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if (!check_freqs(cmd.mask, freqs.new, data)) {
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dprintk("acpi_cpufreq_target failed (%d)\n",
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policy->cpu);
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return -EAGAIN;
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}
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}
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for_each_cpu_mask(i, cmd.mask) {
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freqs.cpu = i;
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cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
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}
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perf->state = next_perf_state;
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return result;
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}
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static int acpi_cpufreq_verify(struct cpufreq_policy *policy)
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{
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struct acpi_cpufreq_data *data = drv_data[policy->cpu];
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dprintk("acpi_cpufreq_verify\n");
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return cpufreq_frequency_table_verify(policy, data->freq_table);
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}
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static unsigned long
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acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu)
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{
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struct acpi_processor_performance *perf = data->acpi_data;
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if (cpu_khz) {
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/* search the closest match to cpu_khz */
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unsigned int i;
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unsigned long freq;
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unsigned long freqn = perf->states[0].core_frequency * 1000;
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for (i=0; i<(perf->state_count-1); i++) {
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freq = freqn;
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freqn = perf->states[i+1].core_frequency * 1000;
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if ((2 * cpu_khz) > (freqn + freq)) {
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perf->state = i;
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return freq;
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}
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}
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perf->state = perf->state_count-1;
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return freqn;
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} else {
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/* assume CPU is at P0... */
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perf->state = 0;
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return perf->states[0].core_frequency * 1000;
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}
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}
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/*
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* acpi_cpufreq_early_init - initialize ACPI P-States library
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*
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* Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c)
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* in order to determine correct frequency and voltage pairings. We can
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* do _PDC and _PSD and find out the processor dependency for the
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* actual init that will happen later...
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*/
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static int acpi_cpufreq_early_init(void)
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{
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struct acpi_processor_performance *data;
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cpumask_t covered;
|
|
unsigned int i, j;
|
|
|
|
dprintk("acpi_cpufreq_early_init\n");
|
|
|
|
for_each_possible_cpu(i) {
|
|
data = kzalloc(sizeof(struct acpi_processor_performance),
|
|
GFP_KERNEL);
|
|
if (!data) {
|
|
for_each_cpu_mask(j, covered) {
|
|
kfree(acpi_perf_data[j]);
|
|
acpi_perf_data[j] = NULL;
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
acpi_perf_data[i] = data;
|
|
cpu_set(i, covered);
|
|
}
|
|
|
|
/* Do initialization in ACPI core */
|
|
acpi_processor_preregister_performance(acpi_perf_data);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
/*
|
|
* Some BIOSes do SW_ANY coordination internally, either set it up in hw
|
|
* or do it in BIOS firmware and won't inform about it to OS. If not
|
|
* detected, this has a side effect of making CPU run at a different speed
|
|
* than OS intended it to run at. Detect it and handle it cleanly.
|
|
*/
|
|
static int bios_with_sw_any_bug;
|
|
|
|
static int sw_any_bug_found(struct dmi_system_id *d)
|
|
{
|
|
bios_with_sw_any_bug = 1;
|
|
return 0;
|
|
}
|
|
|
|
static struct dmi_system_id sw_any_bug_dmi_table[] = {
|
|
{
|
|
.callback = sw_any_bug_found,
|
|
.ident = "Supermicro Server X6DLP",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
|
|
DMI_MATCH(DMI_BIOS_VERSION, "080010"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"),
|
|
},
|
|
},
|
|
{ }
|
|
};
|
|
#endif
|
|
|
|
static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
|
|
{
|
|
unsigned int i;
|
|
unsigned int valid_states = 0;
|
|
unsigned int cpu = policy->cpu;
|
|
struct acpi_cpufreq_data *data;
|
|
unsigned int result = 0;
|
|
struct cpuinfo_x86 *c = &cpu_data[policy->cpu];
|
|
struct acpi_processor_performance *perf;
|
|
|
|
dprintk("acpi_cpufreq_cpu_init\n");
|
|
|
|
if (!acpi_perf_data[cpu])
|
|
return -ENODEV;
|
|
|
|
data = kzalloc(sizeof(struct acpi_cpufreq_data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
data->acpi_data = acpi_perf_data[cpu];
|
|
drv_data[cpu] = data;
|
|
|
|
if (cpu_has(c, X86_FEATURE_CONSTANT_TSC))
|
|
acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS;
|
|
|
|
result = acpi_processor_register_performance(data->acpi_data, cpu);
|
|
if (result)
|
|
goto err_free;
|
|
|
|
perf = data->acpi_data;
|
|
policy->shared_type = perf->shared_type;
|
|
|
|
/*
|
|
* Will let policy->cpus know about dependency only when software
|
|
* coordination is required.
|
|
*/
|
|
if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL ||
|
|
policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) {
|
|
policy->cpus = perf->shared_cpu_map;
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
dmi_check_system(sw_any_bug_dmi_table);
|
|
if (bios_with_sw_any_bug && cpus_weight(policy->cpus) == 1) {
|
|
policy->shared_type = CPUFREQ_SHARED_TYPE_ALL;
|
|
policy->cpus = cpu_core_map[cpu];
|
|
}
|
|
#endif
|
|
|
|
/* capability check */
|
|
if (perf->state_count <= 1) {
|
|
dprintk("No P-States\n");
|
|
result = -ENODEV;
|
|
goto err_unreg;
|
|
}
|
|
|
|
if (perf->control_register.space_id != perf->status_register.space_id) {
|
|
result = -ENODEV;
|
|
goto err_unreg;
|
|
}
|
|
|
|
switch (perf->control_register.space_id) {
|
|
case ACPI_ADR_SPACE_SYSTEM_IO:
|
|
dprintk("SYSTEM IO addr space\n");
|
|
data->cpu_feature = SYSTEM_IO_CAPABLE;
|
|
break;
|
|
case ACPI_ADR_SPACE_FIXED_HARDWARE:
|
|
dprintk("HARDWARE addr space\n");
|
|
if (!check_est_cpu(cpu)) {
|
|
result = -ENODEV;
|
|
goto err_unreg;
|
|
}
|
|
data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE;
|
|
break;
|
|
default:
|
|
dprintk("Unknown addr space %d\n",
|
|
(u32) (perf->control_register.space_id));
|
|
result = -ENODEV;
|
|
goto err_unreg;
|
|
}
|
|
|
|
data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) *
|
|
(perf->state_count+1), GFP_KERNEL);
|
|
if (!data->freq_table) {
|
|
result = -ENOMEM;
|
|
goto err_unreg;
|
|
}
|
|
|
|
/* detect transition latency */
|
|
policy->cpuinfo.transition_latency = 0;
|
|
for (i=0; i<perf->state_count; i++) {
|
|
if ((perf->states[i].transition_latency * 1000) >
|
|
policy->cpuinfo.transition_latency)
|
|
policy->cpuinfo.transition_latency =
|
|
perf->states[i].transition_latency * 1000;
|
|
}
|
|
policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
|
|
|
|
data->max_freq = perf->states[0].core_frequency * 1000;
|
|
/* table init */
|
|
for (i=0; i<perf->state_count; i++) {
|
|
if (i>0 && perf->states[i].core_frequency ==
|
|
perf->states[i-1].core_frequency)
|
|
continue;
|
|
|
|
data->freq_table[valid_states].index = i;
|
|
data->freq_table[valid_states].frequency =
|
|
perf->states[i].core_frequency * 1000;
|
|
valid_states++;
|
|
}
|
|
data->freq_table[valid_states].frequency = CPUFREQ_TABLE_END;
|
|
perf->state = 0;
|
|
|
|
result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table);
|
|
if (result)
|
|
goto err_freqfree;
|
|
|
|
switch (perf->control_register.space_id) {
|
|
case ACPI_ADR_SPACE_SYSTEM_IO:
|
|
/* Current speed is unknown and not detectable by IO port */
|
|
policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu);
|
|
break;
|
|
case ACPI_ADR_SPACE_FIXED_HARDWARE:
|
|
acpi_cpufreq_driver.get = get_cur_freq_on_cpu;
|
|
policy->cur = get_cur_freq_on_cpu(cpu);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* notify BIOS that we exist */
|
|
acpi_processor_notify_smm(THIS_MODULE);
|
|
|
|
/* Check for APERF/MPERF support in hardware */
|
|
if (c->x86_vendor == X86_VENDOR_INTEL && c->cpuid_level >= 6) {
|
|
unsigned int ecx;
|
|
ecx = cpuid_ecx(6);
|
|
if (ecx & CPUID_6_ECX_APERFMPERF_CAPABILITY)
|
|
acpi_cpufreq_driver.getavg = get_measured_perf;
|
|
}
|
|
|
|
dprintk("CPU%u - ACPI performance management activated.\n", cpu);
|
|
for (i = 0; i < perf->state_count; i++)
|
|
dprintk(" %cP%d: %d MHz, %d mW, %d uS\n",
|
|
(i == perf->state ? '*' : ' '), i,
|
|
(u32) perf->states[i].core_frequency,
|
|
(u32) perf->states[i].power,
|
|
(u32) perf->states[i].transition_latency);
|
|
|
|
cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu);
|
|
|
|
/*
|
|
* the first call to ->target() should result in us actually
|
|
* writing something to the appropriate registers.
|
|
*/
|
|
data->resume = 1;
|
|
|
|
return result;
|
|
|
|
err_freqfree:
|
|
kfree(data->freq_table);
|
|
err_unreg:
|
|
acpi_processor_unregister_performance(perf, cpu);
|
|
err_free:
|
|
kfree(data);
|
|
drv_data[cpu] = NULL;
|
|
|
|
return result;
|
|
}
|
|
|
|
static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy)
|
|
{
|
|
struct acpi_cpufreq_data *data = drv_data[policy->cpu];
|
|
|
|
dprintk("acpi_cpufreq_cpu_exit\n");
|
|
|
|
if (data) {
|
|
cpufreq_frequency_table_put_attr(policy->cpu);
|
|
drv_data[policy->cpu] = NULL;
|
|
acpi_processor_unregister_performance(data->acpi_data,
|
|
policy->cpu);
|
|
kfree(data);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_cpufreq_resume(struct cpufreq_policy *policy)
|
|
{
|
|
struct acpi_cpufreq_data *data = drv_data[policy->cpu];
|
|
|
|
dprintk("acpi_cpufreq_resume\n");
|
|
|
|
data->resume = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct freq_attr *acpi_cpufreq_attr[] = {
|
|
&cpufreq_freq_attr_scaling_available_freqs,
|
|
NULL,
|
|
};
|
|
|
|
static struct cpufreq_driver acpi_cpufreq_driver = {
|
|
.verify = acpi_cpufreq_verify,
|
|
.target = acpi_cpufreq_target,
|
|
.init = acpi_cpufreq_cpu_init,
|
|
.exit = acpi_cpufreq_cpu_exit,
|
|
.resume = acpi_cpufreq_resume,
|
|
.name = "acpi-cpufreq",
|
|
.owner = THIS_MODULE,
|
|
.attr = acpi_cpufreq_attr,
|
|
};
|
|
|
|
static int __init acpi_cpufreq_init(void)
|
|
{
|
|
dprintk("acpi_cpufreq_init\n");
|
|
|
|
acpi_cpufreq_early_init();
|
|
|
|
return cpufreq_register_driver(&acpi_cpufreq_driver);
|
|
}
|
|
|
|
static void __exit acpi_cpufreq_exit(void)
|
|
{
|
|
unsigned int i;
|
|
dprintk("acpi_cpufreq_exit\n");
|
|
|
|
cpufreq_unregister_driver(&acpi_cpufreq_driver);
|
|
|
|
for_each_possible_cpu(i) {
|
|
kfree(acpi_perf_data[i]);
|
|
acpi_perf_data[i] = NULL;
|
|
}
|
|
return;
|
|
}
|
|
|
|
module_param(acpi_pstate_strict, uint, 0644);
|
|
MODULE_PARM_DESC(acpi_pstate_strict,
|
|
"value 0 or non-zero. non-zero -> strict ACPI checks are "
|
|
"performed during frequency changes.");
|
|
|
|
late_initcall(acpi_cpufreq_init);
|
|
module_exit(acpi_cpufreq_exit);
|
|
|
|
MODULE_ALIAS("acpi");
|