2005-04-17 00:20:36 +02:00
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/*
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* (C) 2001 Dave Jones, Arjan van de ven.
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* (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
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*
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* Licensed under the terms of the GNU GPL License version 2.
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* Based upon reverse engineered information, and on Intel documentation
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* for chipsets ICH2-M and ICH3-M.
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*
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* Many thanks to Ducrot Bruno for finding and fixing the last
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* "missing link" for ICH2-M/ICH3-M support, and to Thomas Winkler
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* for extensive testing.
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*
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* BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
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*/
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/*********************************************************************
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* SPEEDSTEP - DEFINITIONS *
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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/cpufreq.h>
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#include <linux/pci.h>
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Detach sched.h from mm.h
First thing mm.h does is including sched.h solely for can_do_mlock() inline
function which has "current" dereference inside. By dealing with can_do_mlock()
mm.h can be detached from sched.h which is good. See below, why.
This patch
a) removes unconditional inclusion of sched.h from mm.h
b) makes can_do_mlock() normal function in mm/mlock.c
c) exports can_do_mlock() to not break compilation
d) adds sched.h inclusions back to files that were getting it indirectly.
e) adds less bloated headers to some files (asm/signal.h, jiffies.h) that were
getting them indirectly
Net result is:
a) mm.h users would get less code to open, read, preprocess, parse, ... if
they don't need sched.h
b) sched.h stops being dependency for significant number of files:
on x86_64 allmodconfig touching sched.h results in recompile of 4083 files,
after patch it's only 3744 (-8.3%).
Cross-compile tested on
all arm defconfigs, all mips defconfigs, all powerpc defconfigs,
alpha alpha-up
arm
i386 i386-up i386-defconfig i386-allnoconfig
ia64 ia64-up
m68k
mips
parisc parisc-up
powerpc powerpc-up
s390 s390-up
sparc sparc-up
sparc64 sparc64-up
um-x86_64
x86_64 x86_64-up x86_64-defconfig x86_64-allnoconfig
as well as my two usual configs.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-20 23:22:52 +02:00
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#include <linux/sched.h>
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2005-04-17 00:20:36 +02:00
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2012-01-26 00:09:12 +01:00
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#include <asm/cpu_device_id.h>
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2005-04-17 00:20:36 +02:00
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#include "speedstep-lib.h"
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/* speedstep_chipset:
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* It is necessary to know which chipset is used. As accesses to
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* this device occur at various places in this module, we need a
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* static struct pci_dev * pointing to that device.
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*/
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static struct pci_dev *speedstep_chipset_dev;
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/* speedstep_processor
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*/
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2009-11-17 23:39:53 +01:00
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static enum speedstep_processor speedstep_processor;
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2005-04-17 00:20:36 +02:00
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2005-11-30 22:00:59 +01:00
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static u32 pmbase;
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2005-04-17 00:20:36 +02:00
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/*
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* There are only two frequency states for each processor. Values
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* are in kHz for the time being.
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*/
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static struct cpufreq_frequency_table speedstep_freqs[] = {
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{SPEEDSTEP_HIGH, 0},
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{SPEEDSTEP_LOW, 0},
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{0, CPUFREQ_TABLE_END},
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};
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/**
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2005-11-30 22:00:59 +01:00
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* speedstep_find_register - read the PMBASE address
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2005-04-17 00:20:36 +02:00
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*
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2005-11-30 22:00:59 +01:00
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* Returns: -ENODEV if no register could be found
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2005-04-17 00:20:36 +02:00
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*/
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2009-01-18 05:55:22 +01:00
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static int speedstep_find_register(void)
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2005-04-17 00:20:36 +02:00
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{
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2005-11-30 22:00:59 +01:00
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if (!speedstep_chipset_dev)
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return -ENODEV;
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2005-04-17 00:20:36 +02:00
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/* get PMBASE */
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pci_read_config_dword(speedstep_chipset_dev, 0x40, &pmbase);
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if (!(pmbase & 0x01)) {
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printk(KERN_ERR "speedstep-ich: could not find speedstep register\n");
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2005-11-30 22:00:59 +01:00
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return -ENODEV;
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2005-04-17 00:20:36 +02:00
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}
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pmbase &= 0xFFFFFFFE;
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if (!pmbase) {
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printk(KERN_ERR "speedstep-ich: could not find speedstep register\n");
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2005-11-30 22:00:59 +01:00
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return -ENODEV;
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2005-04-17 00:20:36 +02:00
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}
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2011-03-27 15:04:46 +02:00
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pr_debug("pmbase is 0x%x\n", pmbase);
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2005-11-30 22:00:59 +01:00
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return 0;
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}
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/**
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* speedstep_set_state - set the SpeedStep state
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* @state: new processor frequency state (SPEEDSTEP_LOW or SPEEDSTEP_HIGH)
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*
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2009-06-11 15:29:58 +02:00
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* Tries to change the SpeedStep state. Can be called from
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* smp_call_function_single.
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2005-11-30 22:00:59 +01:00
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*/
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2009-01-18 05:55:22 +01:00
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static void speedstep_set_state(unsigned int state)
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2005-11-30 22:00:59 +01:00
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{
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u8 pm2_blk;
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u8 value;
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unsigned long flags;
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if (state > 0x1)
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return;
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2005-04-17 00:20:36 +02:00
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/* Disable IRQs */
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local_irq_save(flags);
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/* read state */
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value = inb(pmbase + 0x50);
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2011-03-27 15:04:46 +02:00
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pr_debug("read at pmbase 0x%x + 0x50 returned 0x%x\n", pmbase, value);
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2005-04-17 00:20:36 +02:00
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/* write new state */
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value &= 0xFE;
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value |= state;
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2011-03-27 15:04:46 +02:00
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pr_debug("writing 0x%x to pmbase 0x%x + 0x50\n", value, pmbase);
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2005-04-17 00:20:36 +02:00
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/* Disable bus master arbitration */
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pm2_blk = inb(pmbase + 0x20);
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pm2_blk |= 0x01;
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outb(pm2_blk, (pmbase + 0x20));
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/* Actual transition */
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outb(value, (pmbase + 0x50));
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/* Restore bus master arbitration */
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pm2_blk &= 0xfe;
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outb(pm2_blk, (pmbase + 0x20));
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/* check if transition was successful */
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value = inb(pmbase + 0x50);
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/* Enable IRQs */
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local_irq_restore(flags);
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2011-03-27 15:04:46 +02:00
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pr_debug("read at pmbase 0x%x + 0x50 returned 0x%x\n", pmbase, value);
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2005-04-17 00:20:36 +02:00
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2009-01-18 05:55:22 +01:00
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if (state == (value & 0x1))
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2011-03-27 15:04:46 +02:00
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pr_debug("change to %u MHz succeeded\n",
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2009-01-18 05:55:22 +01:00
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speedstep_get_frequency(speedstep_processor) / 1000);
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else
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printk(KERN_ERR "cpufreq: change failed - I/O error\n");
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2005-04-17 00:20:36 +02:00
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return;
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}
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2009-06-11 15:29:58 +02:00
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/* Wrapper for smp_call_function_single. */
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static void _speedstep_set_state(void *_state)
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{
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speedstep_set_state(*(unsigned int *)_state);
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}
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2005-04-17 00:20:36 +02:00
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/**
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* speedstep_activate - activate SpeedStep control in the chipset
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*
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* Tries to activate the SpeedStep status and control registers.
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* Returns -EINVAL on an unsupported chipset, and zero on success.
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*/
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2009-01-18 05:55:22 +01:00
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static int speedstep_activate(void)
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2005-04-17 00:20:36 +02:00
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{
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u16 value = 0;
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if (!speedstep_chipset_dev)
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return -EINVAL;
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pci_read_config_word(speedstep_chipset_dev, 0x00A0, &value);
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if (!(value & 0x08)) {
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value |= 0x08;
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2011-03-27 15:04:46 +02:00
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pr_debug("activating SpeedStep (TM) registers\n");
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2005-04-17 00:20:36 +02:00
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pci_write_config_word(speedstep_chipset_dev, 0x00A0, value);
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}
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return 0;
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}
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/**
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* speedstep_detect_chipset - detect the Southbridge which contains SpeedStep logic
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*
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* Detects ICH2-M, ICH3-M and ICH4-M so far. The pci_dev points to
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* the LPC bridge / PM module which contains all power-management
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* functions. Returns the SPEEDSTEP_CHIPSET_-number for the detected
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* chipset, or zero on failure.
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*/
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2009-01-18 05:55:22 +01:00
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static unsigned int speedstep_detect_chipset(void)
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2005-04-17 00:20:36 +02:00
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{
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speedstep_chipset_dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
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PCI_DEVICE_ID_INTEL_82801DB_12,
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2009-01-18 05:55:22 +01:00
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PCI_ANY_ID, PCI_ANY_ID,
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2005-04-17 00:20:36 +02:00
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NULL);
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if (speedstep_chipset_dev)
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return 4; /* 4-M */
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speedstep_chipset_dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
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PCI_DEVICE_ID_INTEL_82801CA_12,
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2009-01-18 05:55:22 +01:00
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PCI_ANY_ID, PCI_ANY_ID,
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2005-04-17 00:20:36 +02:00
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NULL);
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if (speedstep_chipset_dev)
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return 3; /* 3-M */
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speedstep_chipset_dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
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PCI_DEVICE_ID_INTEL_82801BA_10,
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2009-01-18 05:55:22 +01:00
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PCI_ANY_ID, PCI_ANY_ID,
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2005-04-17 00:20:36 +02:00
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NULL);
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if (speedstep_chipset_dev) {
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/* speedstep.c causes lockups on Dell Inspirons 8000 and
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* 8100 which use a pretty old revision of the 82815
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2012-07-18 02:09:27 +02:00
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* host bridge. Abort on these systems.
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2005-04-17 00:20:36 +02:00
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*/
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static struct pci_dev *hostbridge;
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hostbridge = pci_get_subsys(PCI_VENDOR_ID_INTEL,
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PCI_DEVICE_ID_INTEL_82815_MC,
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2009-01-18 05:55:22 +01:00
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PCI_ANY_ID, PCI_ANY_ID,
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2005-04-17 00:20:36 +02:00
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NULL);
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if (!hostbridge)
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return 2; /* 2-M */
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2007-06-09 00:46:36 +02:00
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if (hostbridge->revision < 5) {
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2011-03-27 15:04:46 +02:00
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pr_debug("hostbridge does not support speedstep\n");
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2005-04-17 00:20:36 +02:00
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speedstep_chipset_dev = NULL;
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pci_dev_put(hostbridge);
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return 0;
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}
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pci_dev_put(hostbridge);
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return 2; /* 2-M */
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}
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return 0;
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}
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2009-11-03 08:35:30 +01:00
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static void get_freq_data(void *_speed)
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2009-06-11 15:29:58 +02:00
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{
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2009-11-03 08:35:30 +01:00
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unsigned int *speed = _speed;
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2009-06-11 15:29:58 +02:00
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2009-11-03 08:35:30 +01:00
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*speed = speedstep_get_frequency(speedstep_processor);
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2005-04-17 00:20:36 +02:00
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}
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static unsigned int speedstep_get(unsigned int cpu)
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{
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2009-11-03 08:35:30 +01:00
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unsigned int speed;
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2009-06-11 15:29:58 +02:00
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/* You're supposed to ensure CPU is online. */
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2009-11-03 08:35:30 +01:00
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if (smp_call_function_single(cpu, get_freq_data, &speed, 1) != 0)
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2009-06-11 15:29:58 +02:00
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BUG();
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2011-03-27 15:04:46 +02:00
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pr_debug("detected %u kHz as current frequency\n", speed);
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2009-11-03 08:35:30 +01:00
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return speed;
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2005-04-17 00:20:36 +02:00
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}
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/**
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* speedstep_target - set a new CPUFreq policy
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* @policy: new policy
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* @target_freq: the target frequency
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2009-01-18 05:55:22 +01:00
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* @relation: how that frequency relates to achieved frequency
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* (CPUFREQ_RELATION_L or CPUFREQ_RELATION_H)
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2005-04-17 00:20:36 +02:00
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*
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* Sets a new CPUFreq policy.
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*/
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2009-01-18 05:55:22 +01:00
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static int speedstep_target(struct cpufreq_policy *policy,
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2005-04-17 00:20:36 +02:00
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unsigned int target_freq,
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unsigned int relation)
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{
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2009-06-11 15:29:58 +02:00
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unsigned int newstate = 0, policy_cpu;
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2005-04-17 00:20:36 +02:00
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struct cpufreq_freqs freqs;
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2009-01-18 05:55:22 +01:00
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if (cpufreq_frequency_table_target(policy, &speedstep_freqs[0],
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target_freq, relation, &newstate))
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2005-04-17 00:20:36 +02:00
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return -EINVAL;
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2009-06-11 15:29:58 +02:00
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policy_cpu = cpumask_any_and(policy->cpus, cpu_online_mask);
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freqs.old = speedstep_get(policy_cpu);
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2005-04-17 00:20:36 +02:00
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freqs.new = speedstep_freqs[newstate].frequency;
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2011-03-27 15:04:46 +02:00
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pr_debug("transiting from %u to %u kHz\n", freqs.old, freqs.new);
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2005-04-17 00:20:36 +02:00
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/* no transition necessary */
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if (freqs.old == freqs.new)
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return 0;
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2013-03-24 07:26:43 +01:00
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cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
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2005-04-17 00:20:36 +02:00
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2009-06-11 15:29:58 +02:00
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smp_call_function_single(policy_cpu, _speedstep_set_state, &newstate,
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true);
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2005-04-17 00:20:36 +02:00
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2013-03-24 07:26:43 +01:00
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cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
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2005-04-17 00:20:36 +02:00
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return 0;
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}
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/**
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* speedstep_verify - verifies a new CPUFreq policy
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* @policy: new policy
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*
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* Limit must be within speedstep_low_freq and speedstep_high_freq, with
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* at least one border included.
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|
*/
|
2009-01-18 05:55:22 +01:00
|
|
|
static int speedstep_verify(struct cpufreq_policy *policy)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
return cpufreq_frequency_table_verify(policy, &speedstep_freqs[0]);
|
|
|
|
}
|
|
|
|
|
2009-06-11 15:29:58 +02:00
|
|
|
struct get_freqs {
|
|
|
|
struct cpufreq_policy *policy;
|
|
|
|
int ret;
|
|
|
|
};
|
|
|
|
|
|
|
|
static void get_freqs_on_cpu(void *_get_freqs)
|
|
|
|
{
|
|
|
|
struct get_freqs *get_freqs = _get_freqs;
|
|
|
|
|
|
|
|
get_freqs->ret =
|
|
|
|
speedstep_get_freqs(speedstep_processor,
|
|
|
|
&speedstep_freqs[SPEEDSTEP_LOW].frequency,
|
|
|
|
&speedstep_freqs[SPEEDSTEP_HIGH].frequency,
|
|
|
|
&get_freqs->policy->cpuinfo.transition_latency,
|
|
|
|
&speedstep_set_state);
|
|
|
|
}
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
static int speedstep_cpu_init(struct cpufreq_policy *policy)
|
|
|
|
{
|
2009-06-11 15:29:58 +02:00
|
|
|
int result;
|
|
|
|
unsigned int policy_cpu, speed;
|
|
|
|
struct get_freqs gf;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
/* only run on CPU to be set, or on its sibling */
|
|
|
|
#ifdef CONFIG_SMP
|
2009-03-13 05:19:50 +01:00
|
|
|
cpumask_copy(policy->cpus, cpu_sibling_mask(policy->cpu));
|
2005-04-17 00:20:36 +02:00
|
|
|
#endif
|
2009-06-11 15:29:58 +02:00
|
|
|
policy_cpu = cpumask_any_and(policy->cpus, cpu_online_mask);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2005-12-02 21:59:41 +01:00
|
|
|
/* detect low and high frequency and transition latency */
|
2009-06-11 15:29:58 +02:00
|
|
|
gf.policy = policy;
|
|
|
|
smp_call_function_single(policy_cpu, get_freqs_on_cpu, &gf, 1);
|
|
|
|
if (gf.ret)
|
|
|
|
return gf.ret;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
/* get current speed setting */
|
2009-06-11 15:29:58 +02:00
|
|
|
speed = speedstep_get(policy_cpu);
|
2005-04-17 00:20:36 +02:00
|
|
|
if (!speed)
|
|
|
|
return -EIO;
|
|
|
|
|
2011-03-27 15:04:46 +02:00
|
|
|
pr_debug("currently at %s speed setting - %i MHz\n",
|
2009-01-18 05:55:22 +01:00
|
|
|
(speed == speedstep_freqs[SPEEDSTEP_LOW].frequency)
|
|
|
|
? "low" : "high",
|
2005-04-17 00:20:36 +02:00
|
|
|
(speed / 1000));
|
|
|
|
|
|
|
|
/* cpuinfo and default policy values */
|
|
|
|
policy->cur = speed;
|
|
|
|
|
|
|
|
result = cpufreq_frequency_table_cpuinfo(policy, speedstep_freqs);
|
|
|
|
if (result)
|
2009-01-18 05:55:22 +01:00
|
|
|
return result;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2009-01-18 05:55:22 +01:00
|
|
|
cpufreq_frequency_table_get_attr(speedstep_freqs, policy->cpu);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int speedstep_cpu_exit(struct cpufreq_policy *policy)
|
|
|
|
{
|
|
|
|
cpufreq_frequency_table_put_attr(policy->cpu);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2009-01-18 05:55:22 +01:00
|
|
|
static struct freq_attr *speedstep_attr[] = {
|
2005-04-17 00:20:36 +02:00
|
|
|
&cpufreq_freq_attr_scaling_available_freqs,
|
|
|
|
NULL,
|
|
|
|
};
|
|
|
|
|
|
|
|
|
2007-02-26 23:55:48 +01:00
|
|
|
static struct cpufreq_driver speedstep_driver = {
|
2005-04-17 00:20:36 +02:00
|
|
|
.name = "speedstep-ich",
|
|
|
|
.verify = speedstep_verify,
|
|
|
|
.target = speedstep_target,
|
|
|
|
.init = speedstep_cpu_init,
|
|
|
|
.exit = speedstep_cpu_exit,
|
|
|
|
.get = speedstep_get,
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.attr = speedstep_attr,
|
|
|
|
};
|
|
|
|
|
2012-01-26 00:09:12 +01:00
|
|
|
static const struct x86_cpu_id ss_smi_ids[] = {
|
|
|
|
{ X86_VENDOR_INTEL, 6, 0xb, },
|
|
|
|
{ X86_VENDOR_INTEL, 6, 0x8, },
|
|
|
|
{ X86_VENDOR_INTEL, 15, 2 },
|
|
|
|
{}
|
|
|
|
};
|
|
|
|
#if 0
|
|
|
|
/* Autoload or not? Do not for now. */
|
|
|
|
MODULE_DEVICE_TABLE(x86cpu, ss_smi_ids);
|
|
|
|
#endif
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
/**
|
|
|
|
* speedstep_init - initializes the SpeedStep CPUFreq driver
|
|
|
|
*
|
|
|
|
* Initializes the SpeedStep support. Returns -ENODEV on unsupported
|
|
|
|
* devices, -EINVAL on problems during initiatization, and zero on
|
|
|
|
* success.
|
|
|
|
*/
|
|
|
|
static int __init speedstep_init(void)
|
|
|
|
{
|
2012-01-26 00:09:12 +01:00
|
|
|
if (!x86_match_cpu(ss_smi_ids))
|
|
|
|
return -ENODEV;
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
/* detect processor */
|
|
|
|
speedstep_processor = speedstep_detect_processor();
|
|
|
|
if (!speedstep_processor) {
|
2011-03-27 15:04:46 +02:00
|
|
|
pr_debug("Intel(R) SpeedStep(TM) capable processor "
|
2009-01-18 05:55:22 +01:00
|
|
|
"not found\n");
|
2005-04-17 00:20:36 +02:00
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* detect chipset */
|
|
|
|
if (!speedstep_detect_chipset()) {
|
2011-03-27 15:04:46 +02:00
|
|
|
pr_debug("Intel(R) SpeedStep(TM) for this chipset not "
|
2009-01-18 05:55:22 +01:00
|
|
|
"(yet) available.\n");
|
2005-04-17 00:20:36 +02:00
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* activate speedstep support */
|
|
|
|
if (speedstep_activate()) {
|
|
|
|
pci_dev_put(speedstep_chipset_dev);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2005-11-30 22:00:59 +01:00
|
|
|
if (speedstep_find_register())
|
|
|
|
return -ENODEV;
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
return cpufreq_register_driver(&speedstep_driver);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
* speedstep_exit - unregisters SpeedStep support
|
|
|
|
*
|
|
|
|
* Unregisters SpeedStep support.
|
|
|
|
*/
|
|
|
|
static void __exit speedstep_exit(void)
|
|
|
|
{
|
|
|
|
pci_dev_put(speedstep_chipset_dev);
|
|
|
|
cpufreq_unregister_driver(&speedstep_driver);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-01-18 05:55:22 +01:00
|
|
|
MODULE_AUTHOR("Dave Jones <davej@redhat.com>, "
|
|
|
|
"Dominik Brodowski <linux@brodo.de>");
|
|
|
|
MODULE_DESCRIPTION("Speedstep driver for Intel mobile processors on chipsets "
|
|
|
|
"with ICH-M southbridges.");
|
|
|
|
MODULE_LICENSE("GPL");
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
module_init(speedstep_init);
|
|
|
|
module_exit(speedstep_exit);
|