Commit 956ee799 authored by Dominik Brodowski's avatar Dominik Brodowski Committed by Linus Torvalds

[PATCH] cpufreq: update HyperThreading support in p4-clockmod.c driver

This patch updates the p4-clockmod.c driver to correctly manage
HyperThreading-enabled Pentium IVs as well as those models which do
not support HyperThreading - thanks to Venkatesh Pallipadi for
explaining cpu_sibling_map to me. Additionally, an EXPORT_SYMBOL
was missing. (spotted by Marc-Christian Petersen - thanks!)
parent dc2d1881
......@@ -50,7 +50,6 @@ static int stock_freq;
MODULE_PARM(stock_freq, "i");
static struct cpufreq_driver *cpufreq_p4_driver;
static unsigned int cpufreq_p4_old_state = 0;
static int cpufreq_p4_setdc(unsigned int cpu, unsigned int newstate)
......@@ -58,24 +57,48 @@ static int cpufreq_p4_setdc(unsigned int cpu, unsigned int newstate)
u32 l, h;
unsigned long cpus_allowed;
struct cpufreq_freqs freqs;
int hyperthreading = 0;
int affected_cpu_map = 0;
int sibling = 0;
if (!cpu_online(cpu) || (newstate > DC_DISABLE) ||
(newstate == DC_RESV))
return -EINVAL;
cpu = cpu >> 1; /* physical CPU #nr */
/* switch to physical CPU where state is to be changed*/
cpus_allowed = current->cpus_allowed;
/* only run on CPU to be set, or on its sibling */
affected_cpu_map = 1 << cpu;
#ifdef CONFIG_X86_HT
hyperthreading = ((cpu_has_ht) && (smp_num_siblings == 2));
if (hyperthreading) {
sibling = cpu_sibling_map[cpu];
affected_cpu_map |= (1 << sibling);
}
#endif
set_cpus_allowed(current, affected_cpu_map);
BUG_ON(!(smp_processor_id() & affected_cpu_map));
/* get current state */
rdmsr(MSR_IA32_THERM_CONTROL, l, h);
l = l >> 1;
l &= 0x7;
if (l == newstate) {
set_cpus_allowed(current, cpus_allowed);
return 0;
}
/* notifiers */
freqs.old = stock_freq * cpufreq_p4_old_state / 8;
freqs.old = stock_freq * l / 8;
freqs.new = stock_freq * newstate / 8;
freqs.cpu = 2*cpu;
freqs.cpu = cpu;
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
freqs.cpu++;
if (hyperthreading) {
freqs.cpu = sibling;
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
/* switch to physical CPU where state is to be changed*/
cpus_allowed = current->cpus_allowed;
set_cpus_allowed(current, 3 << (2 * cpu));
BUG_ON(cpu != (smp_processor_id() >> 1));
}
rdmsr(MSR_IA32_THERM_STATUS, l, h);
if (l & 0x01)
......@@ -86,10 +109,10 @@ static int cpufreq_p4_setdc(unsigned int cpu, unsigned int newstate)
rdmsr(MSR_IA32_THERM_CONTROL, l, h);
if (newstate == DC_DISABLE) {
printk(KERN_INFO PFX "CPU#%d,%d disabling modulation\n", cpu, (cpu + 1));
printk(KERN_INFO PFX "CPU#%d disabling modulation\n", cpu);
wrmsr(MSR_IA32_THERM_CONTROL, l & ~(1<<4), h);
} else {
printk(KERN_INFO PFX "CPU#%d,%d setting duty cycle to %d%%\n", cpu, (cpu + 1), ((125 * newstate) / 10));
printk(KERN_INFO PFX "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
......@@ -104,9 +127,10 @@ static int cpufreq_p4_setdc(unsigned int cpu, unsigned int newstate)
/* notifiers */
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
freqs.cpu--;
if (hyperthreading) {
freqs.cpu = cpu;
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
cpufreq_p4_old_state = newstate;
}
return 0;
}
......@@ -123,7 +147,7 @@ static void cpufreq_p4_setpolicy(struct cpufreq_policy *policy)
if (policy->policy == CPUFREQ_POLICY_POWERSAVE)
{
for (i=8; i>0; i++)
for (i=8; i>0; i--)
if ((policy->min <= ((stock_freq / 8) * i)) &&
(policy->max >= ((stock_freq / 8) * i)))
{
......@@ -131,7 +155,7 @@ static void cpufreq_p4_setpolicy(struct cpufreq_policy *policy)
number_states++;
}
} else {
for (i=0; i<=8; i--)
for (i=1; i<=8; i++)
if ((policy->min <= ((stock_freq / 8) * i)) &&
(policy->max >= ((stock_freq / 8) * i)))
{
......@@ -143,9 +167,9 @@ static void cpufreq_p4_setpolicy(struct cpufreq_policy *policy)
/* if (number_states == 1) */
{
if (policy->cpu == CPUFREQ_ALL_CPUS) {
for (i=0; i<(NR_CPUS/2); i++)
if (cpu_online(2*i))
cpufreq_p4_setdc((2*i), newstate);
for (i=0; i<NR_CPUS; i++)
if (cpu_online(i))
cpufreq_p4_setdc(i, newstate);
} else {
cpufreq_p4_setdc(policy->cpu, newstate);
}
......@@ -235,7 +259,6 @@ int __init cpufreq_p4_init(void)
for (i=0;i<NR_CPUS;i++)
driver->cpu_cur_freq[i] = stock_freq;
#endif
cpufreq_p4_old_state = DC_DISABLE;
driver->verify = &cpufreq_p4_verify;
driver->setpolicy = &cpufreq_p4_setpolicy;
......
......@@ -143,6 +143,11 @@ EXPORT_SYMBOL(mmx_clear_page);
EXPORT_SYMBOL(mmx_copy_page);
#endif
#ifdef CONFIG_X86_HT
EXPORT_SYMBOL(smp_num_siblings);
EXPORT_SYMBOL(cpu_sibling_map);
#endif
#ifdef CONFIG_SMP
EXPORT_SYMBOL(cpu_data);
EXPORT_SYMBOL(cpu_online_map);
......
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