diff options
Diffstat (limited to 'arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c')
| -rw-r--r-- | arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c | 636 |
1 files changed, 0 insertions, 636 deletions
diff --git a/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c b/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c deleted file mode 100644 index ea19d091fd4..00000000000 --- a/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c +++ /dev/null @@ -1,636 +0,0 @@ -/* - * acpi-cpufreq.c - ACPI Processor P-States Driver ($Revision: 1.3 $) - * - * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> - * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> - * Copyright (C) 2002 - 2004 Dominik Brodowski <linux@brodo.de> - * - * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or (at - * your option) any later version. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. - * - * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - */ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/init.h> -#include <linux/cpufreq.h> -#include <linux/proc_fs.h> -#include <linux/seq_file.h> -#include <linux/compiler.h> -#include <linux/sched.h> /* current */ -#include <linux/dmi.h> -#include <asm/io.h> -#include <asm/delay.h> -#include <asm/uaccess.h> - -#include <linux/acpi.h> -#include <acpi/processor.h> - -#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "acpi-cpufreq", msg) - -MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski"); -MODULE_DESCRIPTION("ACPI Processor P-States Driver"); -MODULE_LICENSE("GPL"); - - -struct cpufreq_acpi_io { - struct acpi_processor_performance *acpi_data; - struct cpufreq_frequency_table *freq_table; - unsigned int resume; -}; - -static struct cpufreq_acpi_io *acpi_io_data[NR_CPUS]; -static struct acpi_processor_performance *acpi_perf_data[NR_CPUS]; - -static struct cpufreq_driver acpi_cpufreq_driver; - -static unsigned int acpi_pstate_strict; - -static int -acpi_processor_write_port( - u16 port, - u8 bit_width, - u32 value) -{ - if (bit_width <= 8) { - outb(value, port); - } else if (bit_width <= 16) { - outw(value, port); - } else if (bit_width <= 32) { - outl(value, port); - } else { - return -ENODEV; - } - return 0; -} - -static int -acpi_processor_read_port( - u16 port, - u8 bit_width, - u32 *ret) -{ - *ret = 0; - if (bit_width <= 8) { - *ret = inb(port); - } else if (bit_width <= 16) { - *ret = inw(port); - } else if (bit_width <= 32) { - *ret = inl(port); - } else { - return -ENODEV; - } - return 0; -} - -static int -acpi_processor_set_performance ( - struct cpufreq_acpi_io *data, - unsigned int cpu, - int state) -{ - u16 port = 0; - u8 bit_width = 0; - int i = 0; - int ret = 0; - u32 value = 0; - int retval; - struct acpi_processor_performance *perf; - - dprintk("acpi_processor_set_performance\n"); - - retval = 0; - perf = data->acpi_data; - if (state == perf->state) { - if (unlikely(data->resume)) { - dprintk("Called after resume, resetting to P%d\n", state); - data->resume = 0; - } else { - dprintk("Already at target state (P%d)\n", state); - return (retval); - } - } - - dprintk("Transitioning from P%d to P%d\n", perf->state, state); - - /* - * First we write the target state's 'control' value to the - * control_register. - */ - - port = perf->control_register.address; - bit_width = perf->control_register.bit_width; - value = (u32) perf->states[state].control; - - dprintk("Writing 0x%08x to port 0x%04x\n", value, port); - - ret = acpi_processor_write_port(port, bit_width, value); - if (ret) { - dprintk("Invalid port width 0x%04x\n", bit_width); - return (ret); - } - - /* - * Assume the write went through when acpi_pstate_strict is not used. - * As read status_register is an expensive operation and there - * are no specific error cases where an IO port write will fail. - */ - if (acpi_pstate_strict) { - /* Then we read the 'status_register' and compare the value - * with the target state's 'status' to make sure the - * transition was successful. - * Note that we'll poll for up to 1ms (100 cycles of 10us) - * before giving up. - */ - - port = perf->status_register.address; - bit_width = perf->status_register.bit_width; - - dprintk("Looking for 0x%08x from port 0x%04x\n", - (u32) perf->states[state].status, port); - - for (i = 0; i < 100; i++) { - ret = acpi_processor_read_port(port, bit_width, &value); - if (ret) { - dprintk("Invalid port width 0x%04x\n", bit_width); - return (ret); - } - if (value == (u32) perf->states[state].status) - break; - udelay(10); - } - } else { - value = (u32) perf->states[state].status; - } - - if (unlikely(value != (u32) perf->states[state].status)) { - printk(KERN_WARNING "acpi-cpufreq: Transition failed\n"); - retval = -ENODEV; - return (retval); - } - - dprintk("Transition successful after %d microseconds\n", i * 10); - - perf->state = state; - return (retval); -} - - -static int -acpi_cpufreq_target ( - struct cpufreq_policy *policy, - unsigned int target_freq, - unsigned int relation) -{ - struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu]; - struct acpi_processor_performance *perf; - struct cpufreq_freqs freqs; - cpumask_t online_policy_cpus; - cpumask_t saved_mask; - cpumask_t set_mask; - cpumask_t covered_cpus; - unsigned int cur_state = 0; - unsigned int next_state = 0; - unsigned int result = 0; - unsigned int j; - unsigned int tmp; - - dprintk("acpi_cpufreq_setpolicy\n"); - - result = cpufreq_frequency_table_target(policy, - data->freq_table, - target_freq, - relation, - &next_state); - if (unlikely(result)) - return (result); - - perf = data->acpi_data; - cur_state = perf->state; - freqs.old = data->freq_table[cur_state].frequency; - freqs.new = data->freq_table[next_state].frequency; - -#ifdef CONFIG_HOTPLUG_CPU - /* cpufreq holds the hotplug lock, so we are safe from here on */ - cpus_and(online_policy_cpus, cpu_online_map, policy->cpus); -#else - online_policy_cpus = policy->cpus; -#endif - - for_each_cpu_mask(j, online_policy_cpus) { - freqs.cpu = j; - cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); - } - - /* - * We need to call driver->target() on all or any CPU in - * policy->cpus, depending on policy->shared_type. - */ - saved_mask = current->cpus_allowed; - cpus_clear(covered_cpus); - for_each_cpu_mask(j, online_policy_cpus) { - /* - * Support for SMP systems. - * Make sure we are running on CPU that wants to change freq - */ - cpus_clear(set_mask); - if (policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) - cpus_or(set_mask, set_mask, online_policy_cpus); - else - cpu_set(j, set_mask); - - set_cpus_allowed(current, set_mask); - if (unlikely(!cpu_isset(smp_processor_id(), set_mask))) { - dprintk("couldn't limit to CPUs in this domain\n"); - result = -EAGAIN; - break; - } - - result = acpi_processor_set_performance (data, j, next_state); - if (result) { - result = -EAGAIN; - break; - } - - if (policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) - break; - - cpu_set(j, covered_cpus); - } - - for_each_cpu_mask(j, online_policy_cpus) { - freqs.cpu = j; - cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); - } - - if (unlikely(result)) { - /* - * We have failed halfway through the frequency change. - * We have sent callbacks to online_policy_cpus and - * acpi_processor_set_performance() has been called on - * coverd_cpus. Best effort undo.. - */ - - if (!cpus_empty(covered_cpus)) { - for_each_cpu_mask(j, covered_cpus) { - policy->cpu = j; - acpi_processor_set_performance (data, - j, - cur_state); - } - } - - tmp = freqs.new; - freqs.new = freqs.old; - freqs.old = tmp; - for_each_cpu_mask(j, online_policy_cpus) { - freqs.cpu = j; - cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); - cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); - } - } - - set_cpus_allowed(current, saved_mask); - return (result); -} - - -static int -acpi_cpufreq_verify ( - struct cpufreq_policy *policy) -{ - unsigned int result = 0; - struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu]; - - dprintk("acpi_cpufreq_verify\n"); - - result = cpufreq_frequency_table_verify(policy, - data->freq_table); - - return (result); -} - - -static unsigned long -acpi_cpufreq_guess_freq ( - struct cpufreq_acpi_io *data, - unsigned int cpu) -{ - struct acpi_processor_performance *perf = data->acpi_data; - - if (cpu_khz) { - /* search the closest match to cpu_khz */ - unsigned int i; - unsigned long freq; - unsigned long freqn = perf->states[0].core_frequency * 1000; - - for (i = 0; i < (perf->state_count - 1); i++) { - freq = freqn; - freqn = perf->states[i+1].core_frequency * 1000; - if ((2 * cpu_khz) > (freqn + freq)) { - perf->state = i; - return (freq); - } - } - perf->state = perf->state_count - 1; - return (freqn); - } else { - /* assume CPU is at P0... */ - perf->state = 0; - return perf->states[0].core_frequency * 1000; - } -} - - -/* - * acpi_cpufreq_early_init - initialize ACPI P-States library - * - * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c) - * in order to determine correct frequency and voltage pairings. We can - * do _PDC and _PSD and find out the processor dependency for the - * actual init that will happen later... - */ -static int acpi_cpufreq_early_init_acpi(void) -{ - struct acpi_processor_performance *data; - 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_possible_cpu(j) { - kfree(acpi_perf_data[j]); - acpi_perf_data[j] = NULL; - } - return (-ENOMEM); - } - acpi_perf_data[i] = data; - } - - /* Do initialization in ACPI core */ - return acpi_processor_preregister_performance(acpi_perf_data); -} - -/* - * 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 __init sw_any_bug_found(struct dmi_system_id *d) -{ - bios_with_sw_any_bug = 1; - return 0; -} - -static struct dmi_system_id __initdata 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"), - }, - }, - { } -}; - -static int -acpi_cpufreq_cpu_init ( - struct cpufreq_policy *policy) -{ - unsigned int i; - unsigned int cpu = policy->cpu; - struct cpufreq_acpi_io *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 cpufreq_acpi_io), GFP_KERNEL); - if (!data) - return (-ENOMEM); - - data->acpi_data = acpi_perf_data[cpu]; - acpi_io_data[cpu] = data; - - 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 - - if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) { - acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS; - } - - /* capability check */ - if (perf->state_count <= 1) { - dprintk("No P-States\n"); - result = -ENODEV; - goto err_unreg; - } - - if ((perf->control_register.space_id != ACPI_ADR_SPACE_SYSTEM_IO) || - (perf->status_register.space_id != ACPI_ADR_SPACE_SYSTEM_IO)) { - dprintk("Unsupported address space [%d, %d]\n", - (u32) (perf->control_register.space_id), - (u32) (perf->status_register.space_id)); - result = -ENODEV; - goto err_unreg; - } - - /* alloc freq_table */ - 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; - - /* The current speed is unknown and not detectable by ACPI... */ - policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu); - - /* table init */ - for (i=0; i<=perf->state_count; i++) - { - data->freq_table[i].index = i; - if (i<perf->state_count) - data->freq_table[i].frequency = perf->states[i].core_frequency * 1000; - else - data->freq_table[i].frequency = CPUFREQ_TABLE_END; - } - - result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table); - if (result) { - goto err_freqfree; - } - - /* notify BIOS that we exist */ - acpi_processor_notify_smm(THIS_MODULE); - - printk(KERN_INFO "acpi-cpufreq: 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); - acpi_io_data[cpu] = NULL; - - return (result); -} - - -static int -acpi_cpufreq_cpu_exit ( - struct cpufreq_policy *policy) -{ - struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu]; - - - dprintk("acpi_cpufreq_cpu_exit\n"); - - if (data) { - cpufreq_frequency_table_put_attr(policy->cpu); - acpi_io_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 cpufreq_acpi_io *data = acpi_io_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, - .flags = CPUFREQ_STICKY, -}; - - -static int __init -acpi_cpufreq_init (void) -{ - dprintk("acpi_cpufreq_init\n"); - - acpi_cpufreq_early_init_acpi(); - - 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"); |