mirror of
https://github.com/torvalds/linux.git
synced 2024-11-17 17:41:44 +00:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
338 lines
8.7 KiB
C
338 lines
8.7 KiB
C
/*
|
|
* Pentium 4/Xeon CPU on demand clock modulation/speed scaling
|
|
* (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
|
|
* (C) 2002 Zwane Mwaikambo <zwane@commfireservices.com>
|
|
* (C) 2002 Arjan van de Ven <arjanv@redhat.com>
|
|
* (C) 2002 Tora T. Engstad
|
|
* All Rights Reserved
|
|
*
|
|
* 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.
|
|
*
|
|
* The author(s) of this software shall not be held liable for damages
|
|
* of any nature resulting due to the use of this software. This
|
|
* software is provided AS-IS with no warranties.
|
|
*
|
|
* Date Errata Description
|
|
* 20020525 N44, O17 12.5% or 25% DC causes lockup
|
|
*
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/cpufreq.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/cpumask.h>
|
|
|
|
#include <asm/processor.h>
|
|
#include <asm/msr.h>
|
|
#include <asm/timex.h>
|
|
|
|
#include "speedstep-lib.h"
|
|
|
|
#define PFX "p4-clockmod: "
|
|
#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "p4-clockmod", msg)
|
|
|
|
/*
|
|
* Duty Cycle (3bits), note DC_DISABLE is not specified in
|
|
* intel docs i just use it to mean disable
|
|
*/
|
|
enum {
|
|
DC_RESV, DC_DFLT, DC_25PT, DC_38PT, DC_50PT,
|
|
DC_64PT, DC_75PT, DC_88PT, DC_DISABLE
|
|
};
|
|
|
|
#define DC_ENTRIES 8
|
|
|
|
|
|
static int has_N44_O17_errata[NR_CPUS];
|
|
static unsigned int stock_freq;
|
|
static struct cpufreq_driver p4clockmod_driver;
|
|
static unsigned int cpufreq_p4_get(unsigned int cpu);
|
|
|
|
static int cpufreq_p4_setdc(unsigned int cpu, unsigned int newstate)
|
|
{
|
|
u32 l, h;
|
|
|
|
if (!cpu_online(cpu) || (newstate > DC_DISABLE) || (newstate == DC_RESV))
|
|
return -EINVAL;
|
|
|
|
rdmsr(MSR_IA32_THERM_STATUS, l, h);
|
|
|
|
if (l & 0x01)
|
|
dprintk("CPU#%d currently thermal throttled\n", cpu);
|
|
|
|
if (has_N44_O17_errata[cpu] && (newstate == DC_25PT || newstate == DC_DFLT))
|
|
newstate = DC_38PT;
|
|
|
|
rdmsr(MSR_IA32_THERM_CONTROL, l, h);
|
|
if (newstate == DC_DISABLE) {
|
|
dprintk("CPU#%d disabling modulation\n", cpu);
|
|
wrmsr(MSR_IA32_THERM_CONTROL, l & ~(1<<4), h);
|
|
} else {
|
|
dprintk("CPU#%d setting duty cycle to %d%%\n",
|
|
cpu, ((125 * newstate) / 10));
|
|
/* bits 63 - 5 : reserved
|
|
* bit 4 : enable/disable
|
|
* bits 3-1 : duty cycle
|
|
* bit 0 : reserved
|
|
*/
|
|
l = (l & ~14);
|
|
l = l | (1<<4) | ((newstate & 0x7)<<1);
|
|
wrmsr(MSR_IA32_THERM_CONTROL, l, h);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static struct cpufreq_frequency_table p4clockmod_table[] = {
|
|
{DC_RESV, CPUFREQ_ENTRY_INVALID},
|
|
{DC_DFLT, 0},
|
|
{DC_25PT, 0},
|
|
{DC_38PT, 0},
|
|
{DC_50PT, 0},
|
|
{DC_64PT, 0},
|
|
{DC_75PT, 0},
|
|
{DC_88PT, 0},
|
|
{DC_DISABLE, 0},
|
|
{DC_RESV, CPUFREQ_TABLE_END},
|
|
};
|
|
|
|
|
|
static int cpufreq_p4_target(struct cpufreq_policy *policy,
|
|
unsigned int target_freq,
|
|
unsigned int relation)
|
|
{
|
|
unsigned int newstate = DC_RESV;
|
|
struct cpufreq_freqs freqs;
|
|
cpumask_t cpus_allowed;
|
|
int i;
|
|
|
|
if (cpufreq_frequency_table_target(policy, &p4clockmod_table[0], target_freq, relation, &newstate))
|
|
return -EINVAL;
|
|
|
|
freqs.old = cpufreq_p4_get(policy->cpu);
|
|
freqs.new = stock_freq * p4clockmod_table[newstate].index / 8;
|
|
|
|
if (freqs.new == freqs.old)
|
|
return 0;
|
|
|
|
/* notifiers */
|
|
for_each_cpu_mask(i, policy->cpus) {
|
|
freqs.cpu = i;
|
|
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
|
|
}
|
|
|
|
/* run on each logical CPU, see section 13.15.3 of IA32 Intel Architecture Software
|
|
* Developer's Manual, Volume 3
|
|
*/
|
|
cpus_allowed = current->cpus_allowed;
|
|
|
|
for_each_cpu_mask(i, policy->cpus) {
|
|
cpumask_t this_cpu = cpumask_of_cpu(i);
|
|
|
|
set_cpus_allowed(current, this_cpu);
|
|
BUG_ON(smp_processor_id() != i);
|
|
|
|
cpufreq_p4_setdc(i, p4clockmod_table[newstate].index);
|
|
}
|
|
set_cpus_allowed(current, cpus_allowed);
|
|
|
|
/* notifiers */
|
|
for_each_cpu_mask(i, policy->cpus) {
|
|
freqs.cpu = i;
|
|
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int cpufreq_p4_verify(struct cpufreq_policy *policy)
|
|
{
|
|
return cpufreq_frequency_table_verify(policy, &p4clockmod_table[0]);
|
|
}
|
|
|
|
|
|
static unsigned int cpufreq_p4_get_frequency(struct cpuinfo_x86 *c)
|
|
{
|
|
if ((c->x86 == 0x06) && (c->x86_model == 0x09)) {
|
|
/* Pentium M (Banias) */
|
|
printk(KERN_WARNING PFX "Warning: Pentium M detected. "
|
|
"The speedstep_centrino module offers voltage scaling"
|
|
" in addition of frequency scaling. You should use "
|
|
"that instead of p4-clockmod, if possible.\n");
|
|
return speedstep_get_processor_frequency(SPEEDSTEP_PROCESSOR_PM);
|
|
}
|
|
|
|
if ((c->x86 == 0x06) && (c->x86_model == 0x0D)) {
|
|
/* Pentium M (Dothan) */
|
|
printk(KERN_WARNING PFX "Warning: Pentium M detected. "
|
|
"The speedstep_centrino module offers voltage scaling"
|
|
" in addition of frequency scaling. You should use "
|
|
"that instead of p4-clockmod, if possible.\n");
|
|
/* on P-4s, the TSC runs with constant frequency independent whether
|
|
* throttling is active or not. */
|
|
p4clockmod_driver.flags |= CPUFREQ_CONST_LOOPS;
|
|
return speedstep_get_processor_frequency(SPEEDSTEP_PROCESSOR_PM);
|
|
}
|
|
|
|
if (c->x86 != 0xF) {
|
|
printk(KERN_WARNING PFX "Unknown p4-clockmod-capable CPU. Please send an e-mail to <linux@brodo.de>\n");
|
|
return 0;
|
|
}
|
|
|
|
/* on P-4s, the TSC runs with constant frequency independent whether
|
|
* throttling is active or not. */
|
|
p4clockmod_driver.flags |= CPUFREQ_CONST_LOOPS;
|
|
|
|
if (speedstep_detect_processor() == SPEEDSTEP_PROCESSOR_P4M) {
|
|
printk(KERN_WARNING PFX "Warning: Pentium 4-M detected. "
|
|
"The speedstep-ich or acpi cpufreq modules offer "
|
|
"voltage scaling in addition of frequency scaling. "
|
|
"You should use either one instead of p4-clockmod, "
|
|
"if possible.\n");
|
|
return speedstep_get_processor_frequency(SPEEDSTEP_PROCESSOR_P4M);
|
|
}
|
|
|
|
return speedstep_get_processor_frequency(SPEEDSTEP_PROCESSOR_P4D);
|
|
}
|
|
|
|
|
|
|
|
static int cpufreq_p4_cpu_init(struct cpufreq_policy *policy)
|
|
{
|
|
struct cpuinfo_x86 *c = &cpu_data[policy->cpu];
|
|
int cpuid = 0;
|
|
unsigned int i;
|
|
|
|
#ifdef CONFIG_SMP
|
|
policy->cpus = cpu_sibling_map[policy->cpu];
|
|
#endif
|
|
|
|
/* Errata workaround */
|
|
cpuid = (c->x86 << 8) | (c->x86_model << 4) | c->x86_mask;
|
|
switch (cpuid) {
|
|
case 0x0f07:
|
|
case 0x0f0a:
|
|
case 0x0f11:
|
|
case 0x0f12:
|
|
has_N44_O17_errata[policy->cpu] = 1;
|
|
dprintk("has errata -- disabling low frequencies\n");
|
|
}
|
|
|
|
/* get max frequency */
|
|
stock_freq = cpufreq_p4_get_frequency(c);
|
|
if (!stock_freq)
|
|
return -EINVAL;
|
|
|
|
/* table init */
|
|
for (i=1; (p4clockmod_table[i].frequency != CPUFREQ_TABLE_END); i++) {
|
|
if ((i<2) && (has_N44_O17_errata[policy->cpu]))
|
|
p4clockmod_table[i].frequency = CPUFREQ_ENTRY_INVALID;
|
|
else
|
|
p4clockmod_table[i].frequency = (stock_freq * i)/8;
|
|
}
|
|
cpufreq_frequency_table_get_attr(p4clockmod_table, policy->cpu);
|
|
|
|
/* cpuinfo and default policy values */
|
|
policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
|
|
policy->cpuinfo.transition_latency = 1000000; /* assumed */
|
|
policy->cur = stock_freq;
|
|
|
|
return cpufreq_frequency_table_cpuinfo(policy, &p4clockmod_table[0]);
|
|
}
|
|
|
|
|
|
static int cpufreq_p4_cpu_exit(struct cpufreq_policy *policy)
|
|
{
|
|
cpufreq_frequency_table_put_attr(policy->cpu);
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int cpufreq_p4_get(unsigned int cpu)
|
|
{
|
|
cpumask_t cpus_allowed;
|
|
u32 l, h;
|
|
|
|
cpus_allowed = current->cpus_allowed;
|
|
|
|
set_cpus_allowed(current, cpumask_of_cpu(cpu));
|
|
BUG_ON(smp_processor_id() != cpu);
|
|
|
|
rdmsr(MSR_IA32_THERM_CONTROL, l, h);
|
|
|
|
set_cpus_allowed(current, cpus_allowed);
|
|
|
|
if (l & 0x10) {
|
|
l = l >> 1;
|
|
l &= 0x7;
|
|
} else
|
|
l = DC_DISABLE;
|
|
|
|
if (l != DC_DISABLE)
|
|
return (stock_freq * l / 8);
|
|
|
|
return stock_freq;
|
|
}
|
|
|
|
static struct freq_attr* p4clockmod_attr[] = {
|
|
&cpufreq_freq_attr_scaling_available_freqs,
|
|
NULL,
|
|
};
|
|
|
|
static struct cpufreq_driver p4clockmod_driver = {
|
|
.verify = cpufreq_p4_verify,
|
|
.target = cpufreq_p4_target,
|
|
.init = cpufreq_p4_cpu_init,
|
|
.exit = cpufreq_p4_cpu_exit,
|
|
.get = cpufreq_p4_get,
|
|
.name = "p4-clockmod",
|
|
.owner = THIS_MODULE,
|
|
.attr = p4clockmod_attr,
|
|
};
|
|
|
|
|
|
static int __init cpufreq_p4_init(void)
|
|
{
|
|
struct cpuinfo_x86 *c = cpu_data;
|
|
int ret;
|
|
|
|
/*
|
|
* THERM_CONTROL is architectural for IA32 now, so
|
|
* we can rely on the capability checks
|
|
*/
|
|
if (c->x86_vendor != X86_VENDOR_INTEL)
|
|
return -ENODEV;
|
|
|
|
if (!test_bit(X86_FEATURE_ACPI, c->x86_capability) ||
|
|
!test_bit(X86_FEATURE_ACC, c->x86_capability))
|
|
return -ENODEV;
|
|
|
|
ret = cpufreq_register_driver(&p4clockmod_driver);
|
|
if (!ret)
|
|
printk(KERN_INFO PFX "P4/Xeon(TM) CPU On-Demand Clock Modulation available\n");
|
|
|
|
return (ret);
|
|
}
|
|
|
|
|
|
static void __exit cpufreq_p4_exit(void)
|
|
{
|
|
cpufreq_unregister_driver(&p4clockmod_driver);
|
|
}
|
|
|
|
|
|
MODULE_AUTHOR ("Zwane Mwaikambo <zwane@commfireservices.com>");
|
|
MODULE_DESCRIPTION ("cpufreq driver for Pentium(TM) 4/Xeon(TM)");
|
|
MODULE_LICENSE ("GPL");
|
|
|
|
late_initcall(cpufreq_p4_init);
|
|
module_exit(cpufreq_p4_exit);
|