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Commit 3ee1e204 authored by Linus Torvalds's avatar Linus Torvalds
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Merge bk://linux-dj.bkbits.net/cpufreq 

into home.osdl.org:/home/torvalds/v2.5/linux
parents 6fd6bef3 b9ecdfd3
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CREDITS
View file @ 3ee1e204
......@@ -1522,17 +1522,12 @@ S: USA
N: Dave Jones
E: davej@codemonkey.org.uk
E: davej@suse.de
W: http://www.codemonkey.org.uk
D: x86 errata/setup maintenance.
D: AGPGART driver.
D: CPUFREQ maintenance.
D: Backport/Forwardport merge monkey.
D: Various Janitor work.
S: c/o SuSE Linux UK Ltd
S: Appleton House
S: 139 King Street
S: Hammersmith
S: W6 9JG
S: United Kingdom
N: Ani Joshi
......
Documentation/cpu-freq/core.txt
View file @ 3ee1e204
......@@ -73,9 +73,9 @@ The phase is specified in the second argument to the notifier.
The third argument, a void *pointer, points to a struct cpufreq_policy
consisting of five values: cpu, min, max, policy and max_cpu_freq. min
and max are the lower and upper frequencies (in kHz) of the new
policy, policy the new policy, cpu the number of the affected CPU or
CPUFREQ_ALL_CPUS for all CPUs; and max_cpu_freq the maximum supported
CPU frequency. This value is given for informational purposes only.
policy, policy the new policy, cpu the number of the affected CPU; and
max_cpu_freq the maximum supported CPU frequency. This value is given
for informational purposes only.
2.2 CPUFreq transition notifiers
......@@ -89,6 +89,6 @@ CPUFREQ_POSTCHANGE.
The third argument is a struct cpufreq_freqs with the following
values:
cpu - number of the affected CPU or CPUFREQ_ALL_CPUS
cpu - number of the affected CPU
old - old frequency
new - new frequency
Documentation/cpu-freq/cpu-drivers.txt
View file @ 3ee1e204
......@@ -41,16 +41,17 @@ on what is necessary:
1.1 Initialization
------------------
First of all, in an __initcall level 7 or later (preferrably
module_init() so that your driver is modularized) function check
whether this kernel runs on the right CPU and the right chipset. If
so, register a struct cpufreq_driver with the CPUfreq core using
cpufreq_register_driver()
First of all, in an __initcall level 7 (module_init()) or later
function check whether this kernel runs on the right CPU and the right
chipset. If so, register a struct cpufreq_driver with the CPUfreq core
using cpufreq_register_driver()
What shall this struct cpufreq_driver contain?
cpufreq_driver.name - The name of this driver.
cpufreq_driver.owner - THIS_MODULE;
cpufreq_driver.init - A pointer to the per-CPU initialization
function.
......@@ -76,8 +77,7 @@ cpufreq driver registers itself, the per-CPU initialization function
cpufreq_driver.init is called. It takes a struct cpufreq_policy
*policy as argument. What to do now?
If necessary, activate the CPUfreq support on your CPU (unlock that
register etc.).
If necessary, activate the CPUfreq support on your CPU.
Then, the driver must fill in the following values:
......
Documentation/cpu-freq/governors.txt
View file @ 3ee1e204
......@@ -135,21 +135,21 @@ CPUfreq core to ensure proper locking.
The CPUfreq governor may call the CPU processor driver using one of
these two functions:
inline int cpufreq_driver_target(struct cpufreq_policy *policy,
int cpufreq_driver_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation);
inline int cpufreq_driver_target_l(struct cpufreq_policy *policy,
int __cpufreq_driver_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation);
target_freq must be within policy->min and policy->max, of course.
What's the difference between these two functions? When your governor
still is in a direct code path of a call to governor->governor, the
cpufreq_driver_sem lock is still held in the cpufreq core, and there's
per-CPU cpufreq lock is still held in the cpufreq core, and there's
no need to lock it again (in fact, this would cause a deadlock). So
use cpufreq_driver_target only in these cases. In all other cases (for
example, when there's a "daemonized" function that wakes up every
second), use cpufreq_driver_target_l to lock the cpufreq_driver_sem
before the command is passed to the cpufreq processor driver.
use __cpufreq_driver_target only in these cases. In all other cases
(for example, when there's a "daemonized" function that wakes up
every second), use cpufreq_driver_target to lock the cpufreq per-CPU
lock before the command is passed to the cpufreq processor driver.
Documentation/cpu-freq/user-guide.txt
View file @ 3ee1e204
......@@ -132,7 +132,7 @@ the processor shall run at.
The preferred interface is located in the sysfs filesystem. If you
mounted it at /sys, the cpufreq interface is located in a subdirectory
"cpufreq" within the cpu-device directory
(e.g. /sys/class/cpu/cpu0/cpufreq/ for the first CPU).
(e.g. /sys/devices/system/cpu/cpu0/cpufreq/ for the first CPU).
cpuinfo_min_freq : this file shows the minimum operating
frequency the processor can run at(in kHz)
......
MAINTAINERS
View file @ 3ee1e204
......@@ -431,9 +431,11 @@ W: http://www.fi.muni.cz/~kas/cosa/
S: Maintained
CPU FREQUENCY DRIVERS
L: cpufreq@www.linux.org.uk
W: http://www.brodo.de/cpufreq/
S: Maintained
P: Dave Jones
M: davej@codemonkey.org.uk
L: cpufreq@www.linux.org.uk
W: http://www.codemonkey.org.uk/cpufreq/
S: Maintained
CPUID/MSR DRIVER
P: H. Peter Anvin
......@@ -840,7 +842,7 @@ S: Maintained
i386 SETUP CODE / CPU ERRATA WORKAROUNDS
P: Dave Jones
M: davej@suse.de
M: davej@codemonkey.org.uk
P: H. Peter Anvin
M: hpa@zytor.com
S: Maintained
......
arch/i386/kernel/cpu/common.c
View file @ 3ee1e204
......@@ -288,10 +288,23 @@ void __init identify_cpu(struct cpuinfo_x86 *c)
c->x86 = 3;
}
if (this_cpu->c_identify)
generic_identify(c);
printk(KERN_DEBUG "CPU: After generic identify, caps: %08lx %08lx %08lx %08lx\n",
c->x86_capability[0],
c->x86_capability[1],
c->x86_capability[2],
c->x86_capability[3]);
if (this_cpu->c_identify) {
this_cpu->c_identify(c);
else
generic_identify(c);
printk(KERN_DEBUG "CPU: After vendor identify, caps: %08lx %08lx %08lx %08lx\n",
c->x86_capability[0],
c->x86_capability[1],
c->x86_capability[2],
c->x86_capability[3]);
}
/*
* Vendor-specific initialization. In this section we
......@@ -341,7 +354,7 @@ void __init identify_cpu(struct cpuinfo_x86 *c)
/* Now the feature flags better reflect actual CPU features! */
printk(KERN_DEBUG "CPU: After generic, caps: %08lx %08lx %08lx %08lx\n",
printk(KERN_DEBUG "CPU: After all inits, caps: %08lx %08lx %08lx %08lx\n",
c->x86_capability[0],
c->x86_capability[1],
c->x86_capability[2],
......
arch/i386/kernel/cpu/cpufreq/acpi.c
View file @ 3ee1e204
......@@ -380,7 +380,7 @@ static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file)
static int
acpi_processor_write_performance (
struct file *file,
const char *buffer,
const char __user *buffer,
size_t count,
loff_t *data)
{
......
arch/i386/kernel/cpu/cpufreq/longhaul.c
View file @ 3ee1e204
/*
* $Id: longhaul.c,v 1.87 2003/02/22 10:23:46 db Exp $
*
* (C) 2001 Dave Jones. <davej@suse.de>
* (C) 2001-2003 Dave Jones. <davej@codemonkey.org.uk>
* (C) 2002 Padraig Brady. <padraig@antefacto.com>
*
* Licensed under the terms of the GNU GPL License version 2.
......@@ -32,6 +30,8 @@
#include <asm/timex.h>
#include <asm/io.h>
#include "longhaul.h"
#define DEBUG
#ifdef DEBUG
......@@ -40,6 +40,8 @@
#define dprintk(msg...) do { } while(0)
#endif
#define PFX "longhaul: "
static unsigned int numscales=16, numvscales;
static int minvid, maxvid;
static int can_scale_voltage;
......@@ -248,7 +250,7 @@ static int clock_ratio[32];
static int eblcr_table[32];
static int voltage_table[32];
static unsigned int highest_speed, lowest_speed; /* kHz */
static int longhaul; /* version. */
static int longhaul_version;
static struct cpufreq_frequency_table *longhaul_table;
......@@ -273,7 +275,7 @@ static int longhaul_get_cpu_mult (void)
rdmsr (MSR_IA32_EBL_CR_POWERON, lo, hi);
invalue = (lo & (1<<22|1<<23|1<<24|1<<25)) >>22;
if (longhaul==3) {
if (longhaul_version==3) {
if (lo & (1<<27))
invalue+=16;
}
......@@ -283,19 +285,18 @@ static int longhaul_get_cpu_mult (void)
/**
* longhaul_set_cpu_frequency()
* @clock_ratio_index : index of clock_ratio[] for new frequency
* @clock_ratio_index : bitpattern of the new multiplier.
*
* Sets a new clock ratio, and -if applicable- a new Front Side Bus
*/
static void longhaul_setstate (unsigned int clock_ratio_index)
{
unsigned long lo, hi;
unsigned int bits;
int revkey;
int vidindex, i;
struct cpufreq_freqs freqs;
union msr_longhaul longhaul;
union msr_bcr2 bcr2;
if (clock_ratio[clock_ratio_index] == -1)
return;
......@@ -309,39 +310,33 @@ static void longhaul_setstate (unsigned int clock_ratio_index)
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
dprintk (KERN_INFO "longhaul: FSB:%d Mult(x10):%d\n",
dprintk (KERN_INFO PFX "FSB:%d Mult(x10):%d\n",
fsb * 100, clock_ratio[clock_ratio_index]);
bits = clock_ratio_index;
/* "bits" contains the bitpattern of the new multiplier.
we now need to transform it to the desired format. */
switch (longhaul) {
switch (longhaul_version) {
case 1:
rdmsr (MSR_VIA_BCR2, lo, hi);
revkey = (lo & 0xf)<<4; /* Rev key. */
lo &= ~(1<<23|1<<24|1<<25|1<<26);
lo |= (1<<19); /* Enable software clock multiplier */
lo |= (bits<<23); /* desired multiplier */
lo |= revkey;
wrmsr (MSR_VIA_BCR2, lo, hi);
rdmsrl (MSR_VIA_BCR2, bcr2.val);
/* Enable software clock multiplier */
bcr2.bits.ESOFTBF = 1;
bcr2.bits.CLOCKMUL = clock_ratio_index;
wrmsrl (MSR_VIA_BCR2, bcr2.val);
__hlt();
/* Disable software clock multiplier */
rdmsr (MSR_VIA_BCR2, lo, hi);
lo &= ~(1<<19);
lo |= revkey;
wrmsr (MSR_VIA_BCR2, lo, hi);
rdmsrl (MSR_VIA_BCR2, bcr2.val);
bcr2.bits.ESOFTBF = 0;
wrmsrl (MSR_VIA_BCR2, bcr2.val);
break;
case 2:
rdmsr (MSR_VIA_LONGHAUL, lo, hi);
revkey = (lo & 0xf)<<4; /* Rev key. */
lo &= 0xfff0bf0f; /* reset [19:16,14](bus ratio) and [7:4](rev key) to 0 */
lo |= (bits<<16);
lo |= (1<<8); /* EnableSoftBusRatio */
lo |= revkey;
rdmsrl (MSR_VIA_LONGHAUL, longhaul.val);
longhaul.bits.SoftBusRatio = clock_ratio_index & 0xf;
longhaul.bits.SoftBusRatio4 = (clock_ratio_index & 0x10) >> 4;
longhaul.bits.EnableSoftBusRatio = 1;
/* We must program the revision key only with values we
* know about, not blindly copy it from 0:3 */
longhaul.bits.RevisionKey = 1;
if (can_scale_voltage) {
/* PB: TODO fix this up */
......@@ -356,41 +351,41 @@ static void longhaul_setstate (unsigned int clock_ratio_index)
if (i==32)
goto bad_voltage;
dprintk (KERN_INFO "longhaul: Desired vid index=%d\n", i);
dprintk (KERN_INFO PFX "Desired vid index=%d\n", i);
#if 0
lo &= 0xfe0fffff;/* reset [24:20](voltage) to 0 */
lo |= (i<<20); /* set voltage */
lo |= (1<<9); /* EnableSoftVID */
longhaul.bits.SoftVID = i;
longhaul.bits.EnableSoftVID = 1;
#endif
}
/* FIXME: Do voltage and freq seperatly like we do in powernow-k7 */
bad_voltage:
wrmsr (MSR_VIA_LONGHAUL, lo, hi);
wrmsrl (MSR_VIA_LONGHAUL, longhaul.val);
__hlt();
rdmsr (MSR_VIA_LONGHAUL, lo, hi);
lo &= ~(1<<8);
rdmsrl (MSR_VIA_LONGHAUL, longhaul.val);
longhaul.bits.EnableSoftBusRatio = 0;
if (can_scale_voltage)
lo &= ~(1<<9);
lo |= revkey;
wrmsr (MSR_VIA_LONGHAUL, lo, hi);
longhaul.bits.EnableSoftVID = 0;
longhaul.bits.RevisionKey = 1;
wrmsrl (MSR_VIA_LONGHAUL, longhaul.val);
break;
case 3:
rdmsr (MSR_VIA_LONGHAUL, lo, hi);
revkey = (lo & 0xf)<<4; /* Rev key. */
lo &= 0xfff0bf0f; /* reset longhaul[19:16,14] to 0 */
lo |= (bits<<16);
lo |= (1<<8); /* EnableSoftBusRatio */
lo |= revkey;
wrmsr (MSR_VIA_LONGHAUL, lo, hi);
rdmsrl (MSR_VIA_LONGHAUL, longhaul.val);
longhaul.bits.SoftBusRatio = clock_ratio_index & 0xf;
longhaul.bits.SoftBusRatio4 = (clock_ratio_index & 0x10) >> 4;
longhaul.bits.EnableSoftBusRatio = 1;
/* We must program the revision key only with values we
* know about, not blindly copy it from 0:3 */
longhaul.bits.RevisionKey = 3; /* SoftVID & SoftBSEL */
wrmsrl(MSR_VIA_LONGHAUL, longhaul.val);
__hlt();
rdmsr (MSR_VIA_LONGHAUL, lo, hi);
lo &= ~(1<<8);
lo |= revkey;
wrmsr (MSR_VIA_LONGHAUL, lo, hi);
rdmsrl (MSR_VIA_LONGHAUL, longhaul.val);
longhaul.bits.EnableSoftBusRatio = 0;
longhaul.bits.RevisionKey = 3;
wrmsrl (MSR_VIA_LONGHAUL, longhaul.val);
break;
}
......@@ -400,14 +395,15 @@ static void longhaul_setstate (unsigned int clock_ratio_index)
static int __init longhaul_get_ranges (void)
{
unsigned long lo, hi, invalue;
unsigned long invalue;
unsigned int minmult=0, maxmult=0;
unsigned int multipliers[32]= {
50,30,40,100,55,35,45,95,90,70,80,60,120,75,85,65,
-1,110,120,-1,135,115,125,105,130,150,160,140,-1,155,-1,145 };
unsigned int j, k = 0;
union msr_longhaul longhaul;
switch (longhaul) {
switch (longhaul_version) {
case 1:
/* Ugh, Longhaul v1 didn't have the min/max MSRs.
Assume min=3.0x & max = whatever we booted at. */
......@@ -416,17 +412,17 @@ static int __init longhaul_get_ranges (void)
break;
case 2 ... 3:
rdmsr (MSR_VIA_LONGHAUL, lo, hi);
rdmsrl (MSR_VIA_LONGHAUL, longhaul.val);
invalue = (hi & (1<<0|1<<1|1<<2|1<<3));
if (hi & (1<<11))
invalue = longhaul.bits.MaxMHzBR;
if (longhaul.bits.MaxMHzBR4)
invalue += 16;
maxmult=multipliers[invalue];
#if 0 /* This is MaxMhz @ Min Voltage. Ignore for now */
invalue = (hi & (1<<16|1<<17|1<<18|1<<19)) >> 16;
if (hi & (1<<27))
invalue += 16;
#if 0
invalue = longhaul.bits.MinMHzBR;
if (longhaul.bits.MinMHzBR4);
invalue += 16;
minmult = multipliers[invalue];
#else
minmult = 30; /* as per spec */
......@@ -436,9 +432,9 @@ static int __init longhaul_get_ranges (void)
highest_speed = maxmult * fsb * 100;
lowest_speed = minmult * fsb * 100;
dprintk (KERN_INFO "longhaul: MinMult(x10)=%d MaxMult(x10)=%d\n",
dprintk (KERN_INFO PFX "MinMult(x10)=%d MaxMult(x10)=%d\n",
minmult, maxmult);
dprintk (KERN_INFO "longhaul: Lowestspeed=%d Highestspeed=%d\n",
dprintk (KERN_INFO PFX "Lowestspeed=%d Highestspeed=%d\n",
lowest_speed, highest_speed);
longhaul_table = kmalloc((numscales + 1) * sizeof(struct cpufreq_frequency_table), GFP_KERNEL);
......@@ -460,43 +456,62 @@ static int __init longhaul_get_ranges (void)
kfree (longhaul_table);
return -EINVAL;
}
return 0;
}
static void __init longhaul_setup_voltagescaling (unsigned long lo, unsigned long hi)
static void __init longhaul_setup_voltagescaling(void)
{
int revkey;
union msr_longhaul longhaul;
can_scale_voltage = 1;
rdmsrl (MSR_VIA_LONGHAUL, longhaul.val);
minvid = (hi & (1<<20|1<<21|1<<22|1<<23|1<<24)) >> 20; /* 56:52 */
maxvid = (hi & (1<<4|1<<5|1<<6|1<<7|1<<8)) >> 4; /* 40:36 */
vrmrev = (lo & (1<<15))>>15;
if (!(longhaul.bits.RevisionID & 1))
return;
minvid = longhaul.bits.MinimumVID;
maxvid = longhaul.bits.MaximumVID;
vrmrev = longhaul.bits.VRMRev;
if (minvid == 0 || maxvid == 0) {
printk (KERN_INFO PFX "Bogus values Min:%d.%03d Max:%d.%03d. "
"Voltage scaling disabled.\n",
minvid/1000, minvid%1000, maxvid/1000, maxvid%1000);
return;
}
if (minvid == maxvid) {
printk (KERN_INFO PFX "Claims to support voltage scaling but min & max are "
"both %d.%03d. Voltage scaling disabled\n",
maxvid/1000, maxvid%1000);
return;
}
if (vrmrev==0) {
dprintk (KERN_INFO "longhaul: VRM 8.5 : ");
dprintk (KERN_INFO PFX "VRM 8.5 : ");
memcpy (voltage_table, vrm85scales, sizeof(voltage_table));
numvscales = (voltage_table[maxvid]-voltage_table[minvid])/25;
} else {
dprintk (KERN_INFO "longhaul: Mobile VRM : ");
dprintk (KERN_INFO PFX "Mobile VRM : ");
memcpy (voltage_table, mobilevrmscales, sizeof(voltage_table));
numvscales = (voltage_table[maxvid]-voltage_table[minvid])/5;
}
/* Current voltage isn't readable at first, so we need to
set it to a known value. The spec says to use maxvid */
revkey = (lo & 0xf)<<4; /* Rev key. */
lo &= 0xfe0fff0f; /* Mask unneeded bits */
lo |= (1<<9); /* EnableSoftVID */
lo |= revkey; /* Reinsert key */
lo |= maxvid << 20;
wrmsr (MSR_VIA_LONGHAUL, lo, hi);
longhaul.bits.RevisionKey = longhaul.bits.RevisionID; /* FIXME: This is bad. */
longhaul.bits.EnableSoftVID = 1;
longhaul.bits.SoftVID = maxvid;
wrmsrl (MSR_VIA_LONGHAUL, longhaul.val);
minvid = voltage_table[minvid];
maxvid = voltage_table[maxvid];
dprintk ("Min VID=%d.%03d Max VID=%d.%03d, %d possible voltage scales\n",
maxvid/1000, maxvid%1000, minvid/1000, minvid%1000, numvscales);
can_scale_voltage = 1;
}
......@@ -510,8 +525,8 @@ static int longhaul_target (struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
{
unsigned int table_index = 0;
unsigned int new_clock_ratio = 0;
unsigned int table_index = 0;
unsigned int new_clock_ratio = 0;
if (cpufreq_frequency_table_target(policy, longhaul_table, target_freq, relation, &table_index))
return -EINVAL;
......@@ -530,7 +545,7 @@ static int longhaul_cpu_init (struct cpufreq_policy *policy)
switch (c->x86_model) {
case 6: /* VIA C3 Samuel C5A */
longhaul=1;
longhaul_version=1;
memcpy (clock_ratio, longhaul1_clock_ratio, sizeof(longhaul1_clock_ratio));
memcpy (eblcr_table, samuel1_eblcr, sizeof(samuel1_eblcr));
break;
......@@ -538,12 +553,12 @@ static int longhaul_cpu_init (struct cpufreq_policy *policy)
case 7: /* C5B / C5C */
switch (c->x86_mask) {
case 0:
longhaul=1;
longhaul_version=1;
memcpy (clock_ratio, longhaul1_clock_ratio, sizeof(longhaul1_clock_ratio));
memcpy (eblcr_table, samuel2_eblcr, sizeof(samuel2_eblcr));
break;
case 1 ... 15:
longhaul=2;
longhaul_version=2;
memcpy (clock_ratio, longhaul2_clock_ratio, sizeof(longhaul2_clock_ratio));
memcpy (eblcr_table, ezra_eblcr, sizeof(ezra_eblcr));
break;
......@@ -552,21 +567,18 @@ static int longhaul_cpu_init (struct cpufreq_policy *policy)
case 8: /* C5M/C5N */
return -ENODEV; // Waiting on updated docs from VIA before this is usable
longhaul=3;
longhaul_version=3;
numscales=32;
memcpy (clock_ratio, longhaul3_clock_ratio, sizeof(longhaul3_clock_ratio));
memcpy (eblcr_table, c5m_eblcr, sizeof(c5m_eblcr));
break;
}
printk (KERN_INFO "longhaul: VIA CPU detected. Longhaul version %d supported\n", longhaul);
printk (KERN_INFO PFX "VIA CPU detected. Longhaul version %d supported\n",
longhaul_version);
if (longhaul==2 || longhaul==3) {
unsigned long lo, hi;
rdmsr (MSR_VIA_LONGHAUL, lo, hi);
if ((lo & (1<<0)) && (dont_scale_voltage==0))
longhaul_setup_voltagescaling (lo, hi);
}
if ((longhaul_version==2 || longhaul_version==3) && (dont_scale_voltage==0))
longhaul_setup_voltagescaling();
ret = longhaul_get_ranges();
if (ret != 0)
......@@ -601,7 +613,7 @@ static int __init longhaul_init (void)
case 8:
return -ENODEV;
default:
printk (KERN_INFO "longhaul: Unknown VIA CPU. Contact davej@suse.de\n");
printk (KERN_INFO PFX "Unknown VIA CPU. Contact davej@codemonkey.org.uk\n");
}
return -ENODEV;
......@@ -615,7 +627,7 @@ static void __exit longhaul_exit (void)
MODULE_PARM (dont_scale_voltage, "i");
MODULE_AUTHOR ("Dave Jones <davej@suse.de>");
MODULE_AUTHOR ("Dave Jones <davej@codemonkey.org.uk>");
MODULE_DESCRIPTION ("Longhaul driver for VIA Cyrix processors.");
MODULE_LICENSE ("GPL");
......
arch/i386/kernel/cpu/cpufreq/longhaul.h 0 → 100644
View file @ 3ee1e204
/*
* longhaul.h
* (C) 2003 Dave Jones.
*
* Licensed under the terms of the GNU GPL License version 2.
*
* VIA-specific information
*/
union msr_bcr2 {
struct {
unsigned Reseved:19, // 18:0
ESOFTBF:1, // 19
Reserved2:3, // 22:20
CLOCKMUL:4, // 26:23
Reserved3:5; // 31:27
} bits;
unsigned long val;
};
union msr_longhaul {
struct {
unsigned RevisionID:4, // 3:0
RevisionKey:4, // 7:4
EnableSoftBusRatio:1, // 8
EnableSoftVID:1, // 9
EnableSoftBSEL:1, // 10
Reserved:3, // 11:13
SoftBusRatio4:1, // 14
VRMRev:1, // 15
SoftBusRatio:4, // 19:16
SoftVID:5, // 24:20
Reserved2:3, // 27:25
SoftBSEL:2, // 29:28
Reserved3:2, // 31:30
MaxMHzBR:4, // 35:32
MaximumVID:5, // 40:36
MaxMHzFSB:2, // 42:41
MaxMHzBR4:1, // 43
Reserved4:4, // 47:44
MinMHzBR:4, // 51:48
MinimumVID:5, // 56:52
MinMHzFSB:2, // 58:57
MinMHzBR4:1, // 59
Reserved5:4; // 63:60
} bits;
unsigned long long val;
};
arch/i386/kernel/cpu/cpufreq/longrun.c
View file @ 3ee1e204
/*
* $Id: longrun.c,v 1.25 2003/02/28 16:03:50 db Exp $
*
* (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
*
* Licensed under the terms of the GNU GPL License version 2.
......@@ -123,7 +121,7 @@ static int longrun_verify_policy(struct cpufreq_policy *policy)
policy->cpuinfo.max_freq);
if (policy->policy == CPUFREQ_POLICY_GOVERNOR)
policy->policy = longrun_driver.policy[0].policy;
return -EINVAL;
return 0;
}
......
arch/i386/kernel/cpu/cpufreq/powernow-k6.c
View file @ 3ee1e204
/*
* $Id: powernow-k6.c,v 1.48 2003/02/22 10:23:46 db Exp $
* This file was part of Powertweak Linux (http://powertweak.sf.net)
* and is shared with the Linux Kernel module.
*
* This file was based upon code in Powertweak Linux (http://powertweak.sf.net)
* (C) 2000-2003 Dave Jones, Arjan van de Ven, Janne Pnkl, Dominik Brodowski.
*
* Licensed under the terms of the GNU GPL License version 2.
......@@ -230,7 +227,7 @@ static void __exit powernow_k6_exit(void)
}
MODULE_AUTHOR ("Arjan van de Ven <arjanv@redhat.com>, Dave Jones <davej@suse.de>, Dominik Brodowski <linux@brodo.de>");
MODULE_AUTHOR ("Arjan van de Ven <arjanv@redhat.com>, Dave Jones <davej@codemonkey.org.uk>, Dominik Brodowski <linux@brodo.de>");
MODULE_DESCRIPTION ("PowerNow! driver for AMD K6-2+ / K6-3+ processors.");
MODULE_LICENSE ("GPL");
......
arch/i386/kernel/cpu/cpufreq/powernow-k7.c
View file @ 3ee1e204
/*
* $Id: powernow-k7.c,v 1.34 2003/02/22 10:23:46 db Exp $
*
* (C) 2003 Dave Jones <davej@suse.de>
* AMD K7 Powernow driver.
* (C) 2003 Dave Jones <davej@codemonkey.org.uk> on behalf of SuSE Labs.
*
* Licensed under the terms of the GNU GPL License version 2.
* Based upon datasheets & sample CPUs kindly provided by AMD.
......@@ -85,27 +84,6 @@ static unsigned int latency;
static char have_a0;
#ifndef rdmsrl
#define rdmsrl(msr,val) do {unsigned long l__,h__; \
rdmsr (msr, l__, h__); \
val = l__; \
val |= ((u64)h__<<32); \
} while(0)
#endif
#ifndef wrmsrl
static void wrmsrl (u32 msr, u64 val)
{
u32 lo, hi;
lo = (u32) val;
hi = val >> 32;
wrmsr (msr, lo, hi);
}
#endif
static int check_powernow(void)
{
struct cpuinfo_x86 *c = cpu_data;
......@@ -240,6 +218,7 @@ static void change_speed (unsigned int index)
u8 fid, vid;
struct cpufreq_freqs freqs;
union msr_fidvidstatus fidvidstatus;
int cfid;
/* fid are the lower 8 bits of the index we stored into
* the cpufreq frequency table in powernow_decode_bios,
......@@ -251,8 +230,9 @@ static void change_speed (unsigned int index)
freqs.cpu = 0;
cfid = fidvidstatus.bits.CFID;
rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val);
freqs.old = fsb * fid_codes[fidvidstatus.bits.CFID] * 100;
freqs.old = fsb * fid_codes[cfid] * 100;
freqs.new = powernow_table[index].frequency;
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
......@@ -426,7 +406,7 @@ static void __exit powernow_exit (void)
kfree(powernow_table);
}
MODULE_AUTHOR ("Dave Jones <davej@suse.de>");
MODULE_AUTHOR ("Dave Jones <davej@codemonkey.org.uk>");
MODULE_DESCRIPTION ("Powernow driver for AMD K7 processors.");
MODULE_LICENSE ("GPL");
......
arch/i386/kernel/cpu/cpufreq/powernow-k7.h
View file @ 3ee1e204
......@@ -8,14 +8,6 @@
*
*/
#ifndef MSR_K7_FID_VID_CTL
#define MSR_K7_FID_VID_CTL 0xc0010041
#endif
#ifndef MSR_K7_FID_VID_STATUS
#define MSR_K7_FID_VID_STATUS 0xc0010042
#endif
union msr_fidvidctl {
struct {
unsigned FID:5, // 4:0
......
arch/i386/kernel/cpu/cpufreq/speedstep-ich.c
View file @ 3ee1e204
......@@ -82,7 +82,7 @@ static void speedstep_set_state (unsigned int state, unsigned int notify)
return;
freqs.old = speedstep_get_processor_frequency(speedstep_processor);
freqs.new = speedstep_freqs[SPEEDSTEP_LOW].frequency;
freqs.new = speedstep_freqs[state].frequency;
freqs.cpu = 0; /* speedstep.c is UP only driver */
if (notify)
......@@ -137,7 +137,7 @@ static void speedstep_set_state (unsigned int state, unsigned int notify)
dprintk(KERN_DEBUG "cpufreq: read at pmbase 0x%x + 0x50 returned 0x%x\n", pmbase, value);
if (state == (value & 0x1)) {
dprintk (KERN_INFO "cpufreq: change to %u MHz succeeded\n", (freqs.new / 1000));
dprintk (KERN_INFO "cpufreq: change to %u MHz succeeded\n", (speedstep_get_processor_frequency(speedstep_processor) / 1000));
} else {
printk (KERN_ERR "cpufreq: change failed - I/O error\n");
}
......@@ -295,7 +295,7 @@ static int speedstep_cpu_init(struct cpufreq_policy *policy)
return -EIO;
dprintk(KERN_INFO "cpufreq: currently at %s speed setting - %i MHz\n",
(speed == speedstep_low_freq) ? "low" : "high",
(speed == speedstep_freqs[SPEEDSTEP_LOW].frequency) ? "low" : "high",
(speed / 1000));
/* cpuinfo and default policy values */
......@@ -356,7 +356,7 @@ static void __exit speedstep_exit(void)
}
MODULE_AUTHOR ("Dave Jones <davej@suse.de>, Dominik Brodowski <linux@brodo.de>");
MODULE_AUTHOR ("Dave Jones <davej@codemonkey.org.uk>, Dominik Brodowski <linux@brodo.de>");
MODULE_DESCRIPTION ("Speedstep driver for Intel mobile processors on chipsets with ICH-M southbridges.");
MODULE_LICENSE ("GPL");
......
drivers/cpufreq/userspace.c
View file @ 3ee1e204
......@@ -158,7 +158,7 @@ EXPORT_SYMBOL(cpufreq_get);
/*********************** cpufreq_sysctl interface ********************/
static int
cpufreq_procctl(ctl_table *ctl, int write, struct file *filp,
void *buffer, size_t *lenp)
void __user *buffer, size_t *lenp)
{
char buf[16], *p;
int cpu = (int) ctl->extra1;
......@@ -195,9 +195,9 @@ cpufreq_procctl(ctl_table *ctl, int write, struct file *filp,
}
static int
cpufreq_sysctl(ctl_table *table, int *name, int nlen,
void *oldval, size_t *oldlenp,
void *newval, size_t newlen, void **context)
cpufreq_sysctl(ctl_table *table, int __user *name, int nlen,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen, void **context)
{
int cpu = (int) table->extra1;
......@@ -524,10 +524,10 @@ static int cpufreq_governor_userspace(struct cpufreq_policy *policy,
cpu_min_freq[cpu] = policy->min;
cpu_max_freq[cpu] = policy->max;
if (policy->max < cpu_cur_freq[cpu])
cpufreq_driver_target(&current_policy[cpu], policy->max,
__cpufreq_driver_target(&current_policy[cpu], policy->max,
CPUFREQ_RELATION_H);
else if (policy->min > cpu_cur_freq[cpu])
cpufreq_driver_target(&current_policy[cpu], policy->min,
__cpufreq_driver_target(&current_policy[cpu], policy->min,
CPUFREQ_RELATION_L);
memcpy (&current_policy[cpu], policy, sizeof(struct cpufreq_policy));
up(&userspace_sem);
......
include/asm-i386/msr.h
View file @ 3ee1e204
......@@ -8,15 +8,30 @@
*/
#define rdmsr(msr,val1,val2) \
__asm__ __volatile__("rdmsr" \
__asm__ __volatile__("rdmsr" \
: "=a" (val1), "=d" (val2) \
: "c" (msr))
#define wrmsr(msr,val1,val2) \
__asm__ __volatile__("wrmsr" \
__asm__ __volatile__("wrmsr" \
: /* no outputs */ \
: "c" (msr), "a" (val1), "d" (val2))
#define rdmsrl(msr,val) do { \
unsigned long l__,h__; \
rdmsr (msr, l__, h__); \
val = l__; \
val |= ((u64)h__<<32); \
} while(0)
static inline void wrmsrl (unsigned long msr, unsigned long long val)
{
unsigned long lo, hi;
lo = (unsigned long) val;
hi = val >> 32;
wrmsr (msr, lo, hi);
}
#define rdtsc(low,high) \
__asm__ __volatile__("rdtsc" : "=a" (low), "=d" (high))
......@@ -200,7 +215,7 @@
#define MSR_K7_HWCR 0xC0010015
#define MSR_K7_CLK_CTL 0xC001001b
#define MSR_K7_FID_VID_CTL 0xC0010041
#define MSR_K7_VID_STATUS 0xC0010042
#define MSR_K7_FID_VID_STATUS 0xC0010042
/* Centaur-Hauls/IDT defined MSRs. */
#define MSR_IDT_FCR1 0x107
......
include/linux/cpufreq.h
View file @ 3ee1e204
......@@ -137,9 +137,13 @@ struct cpufreq_governor {
/* pass a target to the cpufreq driver
*/
inline int cpufreq_driver_target(struct cpufreq_policy *policy,
extern int cpufreq_driver_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation);
extern int __cpufreq_driver_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation);
/* pass an event to the cpufreq governor */
int cpufreq_governor(unsigned int cpu, unsigned int event);
......@@ -160,8 +164,6 @@ struct cpufreq_driver {
struct module *owner;
char name[CPUFREQ_NAME_LEN];
struct cpufreq_policy *policy;
/* needed by all drivers */
int (*init) (struct cpufreq_policy *policy);
int (*verify) (struct cpufreq_policy *policy);
......
kernel/cpufreq.c
View file @ 3ee1e204
......@@ -27,20 +27,23 @@
/**
* The "cpufreq driver" - the arch- or hardware-dependend low
* level driver of CPUFreq support, and its locking mutex.
* cpu_max_freq is in kHz.
* level driver of CPUFreq support, and its spinlock. This lock
* also protects the cpufreq_cpu_data array.
*/
static struct cpufreq_driver *cpufreq_driver;
static DECLARE_MUTEX (cpufreq_driver_sem);
static struct cpufreq_policy *cpufreq_cpu_data[NR_CPUS];
static spinlock_t cpufreq_driver_lock = SPIN_LOCK_UNLOCKED;
/* internal prototype */
static int __cpufreq_governor(struct cpufreq_policy *policy, unsigned int event);
/**
* Two notifier lists: the "policy" list is involved in the
* validation process for a new CPU frequency policy; the
* "transition" list for kernel code that needs to handle
* changes to devices when the CPU clock speed changes.
* The mutex locks both lists. If both cpufreq_driver_sem
* and cpufreq_notifier_sem need to be hold, get cpufreq_driver_sem
* first.
* The mutex locks both lists.
*/
static struct notifier_block *cpufreq_policy_notifier_list;
static struct notifier_block *cpufreq_transition_notifier_list;
......@@ -50,28 +53,49 @@ static DECLARE_RWSEM (cpufreq_notifier_rwsem);
static LIST_HEAD(cpufreq_governor_list);
static DECLARE_MUTEX (cpufreq_governor_sem);
static int cpufreq_cpu_get(unsigned int cpu)
static struct cpufreq_policy * cpufreq_cpu_get(unsigned int cpu)
{
struct cpufreq_policy *data;
unsigned long flags;
if (cpu >= NR_CPUS)
return 0;
goto err_out;
/* get the cpufreq driver */
spin_lock_irqsave(&cpufreq_driver_lock, flags);
if (!cpufreq_driver)
return 0;
goto err_out_unlock;
if (!try_module_get(cpufreq_driver->owner))
return 0;
goto err_out_unlock;
if (!kobject_get(&cpufreq_driver->policy[cpu].kobj)) {
module_put(cpufreq_driver->owner);
return 0;
}
return 1;
/* get the CPU */
data = cpufreq_cpu_data[cpu];
if (!data)
goto err_out_put_module;
if (!kobject_get(&data->kobj))
goto err_out_put_module;
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
return data;
err_out_put_module:
module_put(cpufreq_driver->owner);
err_out_unlock:
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
err_out:
return NULL;
}
static void cpufreq_cpu_put(unsigned int cpu)
static void cpufreq_cpu_put(struct cpufreq_policy *data)
{
kobject_put(&cpufreq_driver->policy[cpu].kobj);
kobject_put(&data->kobj);
module_put(cpufreq_driver->owner);
}
......@@ -278,10 +302,11 @@ static ssize_t show(struct kobject * kobj, struct attribute * attr ,char * buf)
struct cpufreq_policy * policy = to_policy(kobj);
struct freq_attr * fattr = to_attr(attr);
ssize_t ret;
if (!cpufreq_cpu_get(policy->cpu))
policy = cpufreq_cpu_get(policy->cpu);
if (!policy)
return -EINVAL;
ret = fattr->show ? fattr->show(policy,buf) : 0;
cpufreq_cpu_put(policy->cpu);
cpufreq_cpu_put(policy);
return ret;
}
......@@ -291,10 +316,11 @@ static ssize_t store(struct kobject * kobj, struct attribute * attr,
struct cpufreq_policy * policy = to_policy(kobj);
struct freq_attr * fattr = to_attr(attr);
ssize_t ret;
if (!cpufreq_cpu_get(policy->cpu))
policy = cpufreq_cpu_get(policy->cpu);
if (!policy)
return -EINVAL;
ret = fattr->store ? fattr->store(policy,buf,count) : 0;
cpufreq_cpu_put(policy->cpu);
cpufreq_cpu_put(policy);
return ret;
}
......@@ -328,28 +354,28 @@ static int cpufreq_add_dev (struct sys_device * sys_dev)
struct cpufreq_policy new_policy;
struct cpufreq_policy *policy;
struct freq_attr **drv_attr;
unsigned long flags;
if (!try_module_get(cpufreq_driver->owner))
return -EINVAL;
policy = kmalloc(sizeof(struct cpufreq_policy), GFP_KERNEL);
if (!policy)
return -ENOMEM;
memset(policy, 0, sizeof(struct cpufreq_policy));
policy->cpu = cpu;
init_MUTEX_LOCKED(&policy->lock);
init_completion(&policy->kobj_unregister);
/* call driver. From then on the cpufreq must be able
* to accept all calls to ->verify and ->setpolicy for this CPU
*/
policy = &cpufreq_driver->policy[cpu];
policy->cpu = cpu;
ret = cpufreq_driver->init(policy);
if (ret)
goto out;
/* set default policy on this CPU */
down(&cpufreq_driver_sem);
memcpy(&new_policy,
policy,
sizeof(struct cpufreq_policy));
up(&cpufreq_driver_sem);
goto err_out;
init_MUTEX(&policy->lock);
init_completion(&policy->kobj_unregister);
memcpy(&new_policy, policy, sizeof(struct cpufreq_policy));
/* prepare interface data */
policy->kobj.parent = &sys_dev->kobj;
......@@ -358,7 +384,7 @@ static int cpufreq_add_dev (struct sys_device * sys_dev)
ret = kobject_register(&policy->kobj);
if (ret)
goto out;
goto err_out;
/* set up files for this cpu device */
drv_attr = cpufreq_driver->attr;
......@@ -366,15 +392,32 @@ static int cpufreq_add_dev (struct sys_device * sys_dev)
sysfs_create_file(&policy->kobj, &((*drv_attr)->attr));
drv_attr++;
}
spin_lock_irqsave(&cpufreq_driver_lock, flags);
cpufreq_cpu_data[cpu] = policy;
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
up(&policy->lock);
/* set default policy */
ret = cpufreq_set_policy(&new_policy);
if (ret) {
kobject_unregister(&policy->kobj);
wait_for_completion(&policy->kobj_unregister);
}
if (ret)
goto err_out_unregister;
out:
module_put(cpufreq_driver->owner);
return 0;
err_out_unregister:
spin_lock_irqsave(&cpufreq_driver_lock, flags);
cpufreq_cpu_data[cpu] = NULL;
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
kobject_unregister(&policy->kobj);
wait_for_completion(&policy->kobj_unregister);
err_out:
kfree(policy);
module_put(cpufreq_driver->owner);
return ret;
}
......@@ -388,34 +431,39 @@ static int cpufreq_add_dev (struct sys_device * sys_dev)
static int cpufreq_remove_dev (struct sys_device * sys_dev)
{
unsigned int cpu = sys_dev->id;
unsigned long flags;
struct cpufreq_policy *data;
if (!kobject_get(&cpufreq_driver->policy[cpu].kobj))
return -EFAULT;
spin_lock_irqsave(&cpufreq_driver_lock, flags);
data = cpufreq_cpu_data[cpu];
down(&cpufreq_driver_sem);
if ((cpufreq_driver->target) &&
(cpufreq_driver->policy[cpu].policy == CPUFREQ_POLICY_GOVERNOR)) {
cpufreq_driver->policy[cpu].governor->governor(&cpufreq_driver->policy[cpu], CPUFREQ_GOV_STOP);
module_put(cpufreq_driver->policy[cpu].governor->owner);
if (!data) {
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
return -EINVAL;
}
cpufreq_cpu_data[cpu] = NULL;
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
/* we may call driver->exit here without checking for try_module_exit
* as it's either the driver which wants to unload or we have a CPU
* removal AND driver removal at the same time...
*/
if (cpufreq_driver->exit)
cpufreq_driver->exit(&cpufreq_driver->policy[cpu]);
if (!kobject_get(&data->kobj))
return -EFAULT;
kobject_unregister(&cpufreq_driver->policy[cpu].kobj);
kobject_unregister(&data->kobj);
up(&cpufreq_driver_sem);
kobject_put(&cpufreq_driver->policy[cpu].kobj);
kobject_put(&data->kobj);
/* we need to make sure that the underlying kobj is actually
* destroyed before we proceed e.g. with cpufreq driver module
* unloading
* not referenced anymore by anybody before we proceed with
* unloading.
*/
wait_for_completion(&cpufreq_driver->policy[cpu].kobj_unregister);
wait_for_completion(&data->kobj_unregister);
if (cpufreq_driver->target)
__cpufreq_governor(data, CPUFREQ_GOV_STOP);
if (cpufreq_driver->exit)
cpufreq_driver->exit(data);
kfree(data);
return 0;
}
......@@ -431,15 +479,20 @@ static int cpufreq_restore(struct sys_device * sysdev)
int cpu = sysdev->id;
unsigned int ret = 0;
struct cpufreq_policy policy;
struct cpufreq_policy *cpu_policy;
if (cpu_online(cpu) && cpufreq_cpu_get(cpu)) {
down(&cpufreq_driver_sem);
memcpy(&policy, &cpufreq_driver->policy[cpu],
sizeof(struct cpufreq_policy));
up(&cpufreq_driver_sem);
ret = cpufreq_set_policy(&policy);
cpufreq_cpu_put(cpu);
}
if (!cpu_online(cpu))
return 0;
cpu_policy = cpufreq_cpu_get(cpu);
down(&cpu_policy->lock);
memcpy(&policy, cpu_policy, sizeof(struct cpufreq_policy));
up(&cpu_policy->lock);
ret = cpufreq_set_policy(&policy);
cpufreq_cpu_put(cpu_policy);
return ret;
}
......@@ -526,68 +579,86 @@ EXPORT_SYMBOL(cpufreq_unregister_notifier);
* GOVERNORS *
*********************************************************************/
inline int cpufreq_driver_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
int __cpufreq_driver_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
{
return cpufreq_driver->target(policy, target_freq, relation);
}
EXPORT_SYMBOL_GPL(__cpufreq_driver_target);
int cpufreq_driver_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
{
unsigned int ret;
unsigned int cpu = policy->cpu;
if (!cpufreq_cpu_get(cpu))
policy = cpufreq_cpu_get(policy->cpu);
if (!policy)
return -EINVAL;
down(&cpufreq_driver->policy[cpu].lock);
down(&policy->lock);
ret = cpufreq_driver->target(policy, target_freq, relation);
ret = __cpufreq_driver_target(policy, target_freq, relation);
up(&cpufreq_driver->policy[cpu].lock);
up(&policy->lock);
cpufreq_cpu_put(cpu);
cpufreq_cpu_put(policy);
return ret;
}
EXPORT_SYMBOL_GPL(cpufreq_driver_target);
int cpufreq_governor(unsigned int cpu, unsigned int event)
static int __cpufreq_governor(struct cpufreq_policy *policy, unsigned int event)
{
int ret = 0;
struct cpufreq_policy *policy = &cpufreq_driver->policy[cpu];
if (!cpufreq_cpu_get(cpu))
return -EINVAL;
switch (policy->policy) {
case CPUFREQ_POLICY_POWERSAVE:
if ((event == CPUFREQ_GOV_LIMITS) || (event == CPUFREQ_GOV_START)) {
down(&cpufreq_driver->policy[cpu].lock);
ret = cpufreq_driver->target(policy, policy->min, CPUFREQ_RELATION_L);
up(&cpufreq_driver->policy[cpu].lock);
ret = __cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L);
}
break;
case CPUFREQ_POLICY_PERFORMANCE:
if ((event == CPUFREQ_GOV_LIMITS) || (event == CPUFREQ_GOV_START)) {
down(&cpufreq_driver->policy[cpu].lock);
ret = cpufreq_driver->target(policy, policy->max, CPUFREQ_RELATION_H);
up(&cpufreq_driver->policy[cpu].lock);
ret = __cpufreq_driver_target(policy, policy->max, CPUFREQ_RELATION_H);
}
break;
case CPUFREQ_POLICY_GOVERNOR:
ret = -EINVAL;
if (!try_module_get(cpufreq_driver->policy[cpu].governor->owner))
if (!try_module_get(policy->governor->owner))
break;
ret = cpufreq_driver->policy[cpu].governor->governor(policy, event);
ret = policy->governor->governor(policy, event);
/* we keep one module reference alive for each CPU governed by this CPU */
if ((event != CPUFREQ_GOV_START) || ret)
module_put(cpufreq_driver->policy[cpu].governor->owner);
module_put(policy->governor->owner);
if ((event == CPUFREQ_GOV_STOP) && !ret)
module_put(cpufreq_driver->policy[cpu].governor->owner);
module_put(policy->governor->owner);
break;
default:
ret = -EINVAL;
}
cpufreq_cpu_put(cpu);
return ret;
}
int cpufreq_governor(unsigned int cpu, unsigned int event)
{
int ret = 0;
struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
if (!policy)
return -EINVAL;
down(&policy->lock);
ret = __cpufreq_governor(policy, event);
up(&policy->lock);
cpufreq_cpu_put(policy);
return ret;
}
......@@ -649,16 +720,19 @@ EXPORT_SYMBOL_GPL(cpufreq_unregister_governor);
*/
int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu)
{
if (!policy || !cpufreq_cpu_get(cpu))
struct cpufreq_policy *cpu_policy;
if (!policy)
return -EINVAL;
down(&cpufreq_driver_sem);
memcpy(policy,
&cpufreq_driver->policy[cpu],
sizeof(struct cpufreq_policy));
up(&cpufreq_driver_sem);
cpu_policy = cpufreq_cpu_get(cpu);
if (!cpu_policy)
return -EINVAL;
cpufreq_cpu_put(cpu);
down(&cpu_policy->lock);
memcpy(policy, cpu_policy, sizeof(struct cpufreq_policy));
up(&cpu_policy->lock);
cpufreq_cpu_put(cpu_policy);
return 0;
}
......@@ -674,15 +748,21 @@ EXPORT_SYMBOL(cpufreq_get_policy);
int cpufreq_set_policy(struct cpufreq_policy *policy)
{
int ret = 0;
struct cpufreq_policy *data;
if (!policy || !cpufreq_cpu_get(policy->cpu))
if (!policy)
return -EINVAL;
down(&cpufreq_driver_sem);
data = cpufreq_cpu_get(policy->cpu);
if (!data)
return -EINVAL;
/* lock this CPU */
down(&data->lock);
memcpy(&policy->cpuinfo,
&cpufreq_driver->policy[policy->cpu].cpuinfo,
&data->cpuinfo,
sizeof(struct cpufreq_cpuinfo));
up(&cpufreq_driver_sem);
/* verify the cpu speed can be set within this limit */
ret = cpufreq_driver->verify(policy);
......@@ -713,39 +793,39 @@ int cpufreq_set_policy(struct cpufreq_policy *policy)
up_read(&cpufreq_notifier_rwsem);
/* from here on we limit it to one limit and/or governor change running at the moment */
down(&cpufreq_driver_sem);
cpufreq_driver->policy[policy->cpu].min = policy->min;
cpufreq_driver->policy[policy->cpu].max = policy->max;
data->min = policy->min;
data->max = policy->max;
if (cpufreq_driver->setpolicy) {
cpufreq_driver->policy[policy->cpu].policy = policy->policy;
data->policy = policy->policy;
ret = cpufreq_driver->setpolicy(policy);
} else {
if ((policy->policy != cpufreq_driver->policy[policy->cpu].policy) ||
((policy->policy == CPUFREQ_POLICY_GOVERNOR) && (policy->governor != cpufreq_driver->policy[policy->cpu].governor))) {
unsigned int old_pol = cpufreq_driver->policy[policy->cpu].policy;
struct cpufreq_governor *old_gov = cpufreq_driver->policy[policy->cpu].governor;
if ((policy->policy != data->policy) ||
((policy->policy == CPUFREQ_POLICY_GOVERNOR) && (policy->governor != data->governor))) {
/* save old, working values */
unsigned int old_pol = data->policy;
struct cpufreq_governor *old_gov = data->governor;
/* end old governor */
cpufreq_governor(policy->cpu, CPUFREQ_GOV_STOP);
cpufreq_driver->policy[policy->cpu].policy = policy->policy;
cpufreq_driver->policy[policy->cpu].governor = policy->governor;
__cpufreq_governor(data, CPUFREQ_GOV_STOP);
/* start new governor */
if (cpufreq_governor(policy->cpu, CPUFREQ_GOV_START)) {
cpufreq_driver->policy[policy->cpu].policy = old_pol;
cpufreq_driver->policy[policy->cpu].governor = old_gov;
cpufreq_governor(policy->cpu, CPUFREQ_GOV_START);
data->policy = policy->policy;
data->governor = policy->governor;
if (__cpufreq_governor(data, CPUFREQ_GOV_START)) {
/* new governor failed, so re-start old one */
data->policy = old_pol;
data->governor = old_gov;
__cpufreq_governor(data, CPUFREQ_GOV_START);
}
/* might be a policy change, too */
cpufreq_governor(policy->cpu, CPUFREQ_GOV_LIMITS);
} else {
cpufreq_governor(policy->cpu, CPUFREQ_GOV_LIMITS);
/* might be a policy change, too, so fall through */
}
__cpufreq_governor(data, CPUFREQ_GOV_LIMITS);
}
up(&cpufreq_driver_sem);
error_out:
cpufreq_cpu_put(policy->cpu);
error_out:
up(&data->lock);
cpufreq_cpu_put(data);
return ret;
}
......@@ -801,7 +881,7 @@ void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state)
case CPUFREQ_POSTCHANGE:
adjust_jiffies(CPUFREQ_POSTCHANGE, freqs);
notifier_call_chain(&cpufreq_transition_notifier_list, CPUFREQ_POSTCHANGE, freqs);
cpufreq_driver->policy[freqs->cpu].cur = freqs->new;
cpufreq_cpu_data[freqs->cpu]->cur = freqs->new;
break;
}
up_read(&cpufreq_notifier_rwsem);
......@@ -826,25 +906,19 @@ EXPORT_SYMBOL_GPL(cpufreq_notify_transition);
*/
int cpufreq_register_driver(struct cpufreq_driver *driver_data)
{
unsigned long flags;
if (!driver_data || !driver_data->verify || !driver_data->init ||
((!driver_data->setpolicy) && (!driver_data->target)))
return -EINVAL;
down(&cpufreq_driver_sem);
spin_lock_irqsave(&cpufreq_driver_lock, flags);
if (cpufreq_driver) {
up(&cpufreq_driver_sem);
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
return -EBUSY;
}
cpufreq_driver = driver_data;
up(&cpufreq_driver_sem);
cpufreq_driver->policy = kmalloc(NR_CPUS * sizeof(struct cpufreq_policy), GFP_KERNEL);
if (!cpufreq_driver->policy) {
cpufreq_driver = NULL;
return -ENOMEM;
}
memset(cpufreq_driver->policy, 0, NR_CPUS * sizeof(struct cpufreq_policy));
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
return sysdev_driver_register(&cpu_sysdev_class,&cpufreq_sysdev_driver);
}
......@@ -861,15 +935,16 @@ EXPORT_SYMBOL_GPL(cpufreq_register_driver);
*/
int cpufreq_unregister_driver(struct cpufreq_driver *driver)
{
unsigned long flags;
if (!cpufreq_driver || (driver != cpufreq_driver))
return -EINVAL;
sysdev_driver_unregister(&cpu_sysdev_class, &cpufreq_sysdev_driver);
down(&cpufreq_driver_sem);
kfree(cpufreq_driver->policy);
spin_lock_irqsave(&cpufreq_driver_lock, flags);
cpufreq_driver = NULL;
up(&cpufreq_driver_sem);
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
return 0;
}
......
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