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linux/drivers/cpufreq/powernow-k8.c
Viresh Kumar 7dbf694db6 cpufreq: distinguish drivers that do asynchronous notifications 
There are few special cases like exynos5440 which doesn't send POSTCHANGE
notification from their ->target() routine and call some kind of bottom halves
for doing this work, work/tasklet/etc.. From which they finally send POSTCHANGE
notification.

Its better if we distinguish them from other cpufreq drivers in some way so that
core can handle them specially. So this patch introduces another flag:
CPUFREQ_ASYNC_NOTIFICATION, which will be set by such drivers.

This also changes exynos5440-cpufreq.c and powernow-k8 in order to set this
flag.

Acked-by: Amit Daniel Kachhap <amit.daniel@samsung.com>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-10-31 00:11:08 +01:00

1288 lines
32 KiB
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/*
* (c) 2003-2012 Advanced Micro Devices, Inc.
* Your use of this code is subject to the terms and conditions of the
* GNU general public license version 2. See "COPYING" or
* http://www.gnu.org/licenses/gpl.html
*
* Maintainer:
* Andreas Herrmann <herrmann.der.user@googlemail.com>
*
* Based on the powernow-k7.c module written by Dave Jones.
* (C) 2003 Dave Jones on behalf of SuSE Labs
* (C) 2004 Dominik Brodowski <linux@brodo.de>
* (C) 2004 Pavel Machek <pavel@ucw.cz>
* Licensed under the terms of the GNU GPL License version 2.
* Based upon datasheets & sample CPUs kindly provided by AMD.
*
* Valuable input gratefully received from Dave Jones, Pavel Machek,
* Dominik Brodowski, Jacob Shin, and others.
* Originally developed by Paul Devriendt.
*
* Processor information obtained from Chapter 9 (Power and Thermal
* Management) of the "BIOS and Kernel Developer's Guide (BKDG) for
* the AMD Athlon 64 and AMD Opteron Processors" and section "2.x
* Power Management" in BKDGs for newer AMD CPU families.
*
* Tables for specific CPUs can be inferred from AMD's processor
* power and thermal data sheets, (e.g. 30417.pdf, 30430.pdf, 43375.pdf)
*/
#include <linux/kernel.h>
#include <linux/smp.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/cpumask.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <asm/msr.h>
#include <asm/cpu_device_id.h>
#include <linux/acpi.h>
#include <linux/mutex.h>
#include <acpi/processor.h>
#define PFX "powernow-k8: "
#define VERSION "version 2.20.00"
#include "powernow-k8.h"
/* serialize freq changes */
static DEFINE_MUTEX(fidvid_mutex);
static DEFINE_PER_CPU(struct powernow_k8_data *, powernow_data);
static struct cpufreq_driver cpufreq_amd64_driver;
#ifndef CONFIG_SMP
static inline const struct cpumask *cpu_core_mask(int cpu)
{
return cpumask_of(0);
}
#endif
/* Return a frequency in MHz, given an input fid */
static u32 find_freq_from_fid(u32 fid)
{
return 800 + (fid * 100);
}
/* Return a frequency in KHz, given an input fid */
static u32 find_khz_freq_from_fid(u32 fid)
{
return 1000 * find_freq_from_fid(fid);
}
/* Return the vco fid for an input fid
*
* Each "low" fid has corresponding "high" fid, and you can get to "low" fids
* only from corresponding high fids. This returns "high" fid corresponding to
* "low" one.
*/
static u32 convert_fid_to_vco_fid(u32 fid)
{
if (fid < HI_FID_TABLE_BOTTOM)
return 8 + (2 * fid);
else
return fid;
}
/*
* Return 1 if the pending bit is set. Unless we just instructed the processor
* to transition to a new state, seeing this bit set is really bad news.
*/
static int pending_bit_stuck(void)
{
u32 lo, hi;
rdmsr(MSR_FIDVID_STATUS, lo, hi);
return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
}
/*
* Update the global current fid / vid values from the status msr.
* Returns 1 on error.
*/
static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
{
u32 lo, hi;
u32 i = 0;
do {
if (i++ > 10000) {
pr_debug("detected change pending stuck\n");
return 1;
}
rdmsr(MSR_FIDVID_STATUS, lo, hi);
} while (lo & MSR_S_LO_CHANGE_PENDING);
data->currvid = hi & MSR_S_HI_CURRENT_VID;
data->currfid = lo & MSR_S_LO_CURRENT_FID;
return 0;
}
/* the isochronous relief time */
static void count_off_irt(struct powernow_k8_data *data)
{
udelay((1 << data->irt) * 10);
return;
}
/* the voltage stabilization time */
static void count_off_vst(struct powernow_k8_data *data)
{
udelay(data->vstable * VST_UNITS_20US);
return;
}
/* need to init the control msr to a safe value (for each cpu) */
static void fidvid_msr_init(void)
{
u32 lo, hi;
u8 fid, vid;
rdmsr(MSR_FIDVID_STATUS, lo, hi);
vid = hi & MSR_S_HI_CURRENT_VID;
fid = lo & MSR_S_LO_CURRENT_FID;
lo = fid | (vid << MSR_C_LO_VID_SHIFT);
hi = MSR_C_HI_STP_GNT_BENIGN;
pr_debug("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo, hi);
wrmsr(MSR_FIDVID_CTL, lo, hi);
}
/* write the new fid value along with the other control fields to the msr */
static int write_new_fid(struct powernow_k8_data *data, u32 fid)
{
u32 lo;
u32 savevid = data->currvid;
u32 i = 0;
if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) {
printk(KERN_ERR PFX "internal error - overflow on fid write\n");
return 1;
}
lo = fid;
lo |= (data->currvid << MSR_C_LO_VID_SHIFT);
lo |= MSR_C_LO_INIT_FID_VID;
pr_debug("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
fid, lo, data->plllock * PLL_LOCK_CONVERSION);
do {
wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
if (i++ > 100) {
printk(KERN_ERR PFX
"Hardware error - pending bit very stuck - "
"no further pstate changes possible\n");
return 1;
}
} while (query_current_values_with_pending_wait(data));
count_off_irt(data);
if (savevid != data->currvid) {
printk(KERN_ERR PFX
"vid change on fid trans, old 0x%x, new 0x%x\n",
savevid, data->currvid);
return 1;
}
if (fid != data->currfid) {
printk(KERN_ERR PFX
"fid trans failed, fid 0x%x, curr 0x%x\n", fid,
data->currfid);
return 1;
}
return 0;
}
/* Write a new vid to the hardware */
static int write_new_vid(struct powernow_k8_data *data, u32 vid)
{
u32 lo;
u32 savefid = data->currfid;
int i = 0;
if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) {
printk(KERN_ERR PFX "internal error - overflow on vid write\n");
return 1;
}
lo = data->currfid;
lo |= (vid << MSR_C_LO_VID_SHIFT);
lo |= MSR_C_LO_INIT_FID_VID;
pr_debug("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
vid, lo, STOP_GRANT_5NS);
do {
wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
if (i++ > 100) {
printk(KERN_ERR PFX "internal error - pending bit "
"very stuck - no further pstate "
"changes possible\n");
return 1;
}
} while (query_current_values_with_pending_wait(data));
if (savefid != data->currfid) {
printk(KERN_ERR PFX "fid changed on vid trans, old "
"0x%x new 0x%x\n",
savefid, data->currfid);
return 1;
}
if (vid != data->currvid) {
printk(KERN_ERR PFX "vid trans failed, vid 0x%x, "
"curr 0x%x\n",
vid, data->currvid);
return 1;
}
return 0;
}
/*
* Reduce the vid by the max of step or reqvid.
* Decreasing vid codes represent increasing voltages:
* vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of VID_OFF is off.
*/
static int decrease_vid_code_by_step(struct powernow_k8_data *data,
u32 reqvid, u32 step)
{
if ((data->currvid - reqvid) > step)
reqvid = data->currvid - step;
if (write_new_vid(data, reqvid))
return 1;
count_off_vst(data);
return 0;
}
/* Change Opteron/Athlon64 fid and vid, by the 3 phases. */
static int transition_fid_vid(struct powernow_k8_data *data,
u32 reqfid, u32 reqvid)
{
if (core_voltage_pre_transition(data, reqvid, reqfid))
return 1;
if (core_frequency_transition(data, reqfid))
return 1;
if (core_voltage_post_transition(data, reqvid))
return 1;
if (query_current_values_with_pending_wait(data))
return 1;
if ((reqfid != data->currfid) || (reqvid != data->currvid)) {
printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, "
"curr 0x%x 0x%x\n",
smp_processor_id(),
reqfid, reqvid, data->currfid, data->currvid);
return 1;
}
pr_debug("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
smp_processor_id(), data->currfid, data->currvid);
return 0;
}
/* Phase 1 - core voltage transition ... setup voltage */
static int core_voltage_pre_transition(struct powernow_k8_data *data,
u32 reqvid, u32 reqfid)
{
u32 rvosteps = data->rvo;
u32 savefid = data->currfid;
u32 maxvid, lo, rvomult = 1;
pr_debug("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, "
"reqvid 0x%x, rvo 0x%x\n",
smp_processor_id(),
data->currfid, data->currvid, reqvid, data->rvo);
if ((savefid < LO_FID_TABLE_TOP) && (reqfid < LO_FID_TABLE_TOP))
rvomult = 2;
rvosteps *= rvomult;
rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
maxvid = 0x1f & (maxvid >> 16);
pr_debug("ph1 maxvid=0x%x\n", maxvid);
if (reqvid < maxvid) /* lower numbers are higher voltages */
reqvid = maxvid;
while (data->currvid > reqvid) {
pr_debug("ph1: curr 0x%x, req vid 0x%x\n",
data->currvid, reqvid);
if (decrease_vid_code_by_step(data, reqvid, data->vidmvs))
return 1;
}
while ((rvosteps > 0) &&
((rvomult * data->rvo + data->currvid) > reqvid)) {
if (data->currvid == maxvid) {
rvosteps = 0;
} else {
pr_debug("ph1: changing vid for rvo, req 0x%x\n",
data->currvid - 1);
if (decrease_vid_code_by_step(data, data->currvid-1, 1))
return 1;
rvosteps--;
}
}
if (query_current_values_with_pending_wait(data))
return 1;
if (savefid != data->currfid) {
printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n",
data->currfid);
return 1;
}
pr_debug("ph1 complete, currfid 0x%x, currvid 0x%x\n",
data->currfid, data->currvid);
return 0;
}
/* Phase 2 - core frequency transition */
static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
{
u32 vcoreqfid, vcocurrfid, vcofiddiff;
u32 fid_interval, savevid = data->currvid;
if (data->currfid == reqfid) {
printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n",
data->currfid);
return 0;
}
pr_debug("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, "
"reqfid 0x%x\n",
smp_processor_id(),
data->currfid, data->currvid, reqfid);
vcoreqfid = convert_fid_to_vco_fid(reqfid);
vcocurrfid = convert_fid_to_vco_fid(data->currfid);
vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
: vcoreqfid - vcocurrfid;
if ((reqfid <= LO_FID_TABLE_TOP) && (data->currfid <= LO_FID_TABLE_TOP))
vcofiddiff = 0;
while (vcofiddiff > 2) {
(data->currfid & 1) ? (fid_interval = 1) : (fid_interval = 2);
if (reqfid > data->currfid) {
if (data->currfid > LO_FID_TABLE_TOP) {
if (write_new_fid(data,
data->currfid + fid_interval))
return 1;
} else {
if (write_new_fid
(data,
2 + convert_fid_to_vco_fid(data->currfid)))
return 1;
}
} else {
if (write_new_fid(data, data->currfid - fid_interval))
return 1;
}
vcocurrfid = convert_fid_to_vco_fid(data->currfid);
vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
: vcoreqfid - vcocurrfid;
}
if (write_new_fid(data, reqfid))
return 1;
if (query_current_values_with_pending_wait(data))
return 1;
if (data->currfid != reqfid) {
printk(KERN_ERR PFX
"ph2: mismatch, failed fid transition, "
"curr 0x%x, req 0x%x\n",
data->currfid, reqfid);
return 1;
}
if (savevid != data->currvid) {
printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n",
savevid, data->currvid);
return 1;
}
pr_debug("ph2 complete, currfid 0x%x, currvid 0x%x\n",
data->currfid, data->currvid);
return 0;
}
/* Phase 3 - core voltage transition flow ... jump to the final vid. */
static int core_voltage_post_transition(struct powernow_k8_data *data,
u32 reqvid)
{
u32 savefid = data->currfid;
u32 savereqvid = reqvid;
pr_debug("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
smp_processor_id(),
data->currfid, data->currvid);
if (reqvid != data->currvid) {
if (write_new_vid(data, reqvid))
return 1;
if (savefid != data->currfid) {
printk(KERN_ERR PFX
"ph3: bad fid change, save 0x%x, curr 0x%x\n",
savefid, data->currfid);
return 1;
}
if (data->currvid != reqvid) {
printk(KERN_ERR PFX
"ph3: failed vid transition\n, "
"req 0x%x, curr 0x%x",
reqvid, data->currvid);
return 1;
}
}
if (query_current_values_with_pending_wait(data))
return 1;
if (savereqvid != data->currvid) {
pr_debug("ph3 failed, currvid 0x%x\n", data->currvid);
return 1;
}
if (savefid != data->currfid) {
pr_debug("ph3 failed, currfid changed 0x%x\n",
data->currfid);
return 1;
}
pr_debug("ph3 complete, currfid 0x%x, currvid 0x%x\n",
data->currfid, data->currvid);
return 0;
}
static const struct x86_cpu_id powernow_k8_ids[] = {
/* IO based frequency switching */
{ X86_VENDOR_AMD, 0xf },
{}
};
MODULE_DEVICE_TABLE(x86cpu, powernow_k8_ids);
static void check_supported_cpu(void *_rc)
{
u32 eax, ebx, ecx, edx;
int *rc = _rc;
*rc = -ENODEV;
eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
if ((eax & CPUID_XFAM) == CPUID_XFAM_K8) {
if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
((eax & CPUID_XMOD) > CPUID_XMOD_REV_MASK)) {
printk(KERN_INFO PFX
"Processor cpuid %x not supported\n", eax);
return;
}
eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
printk(KERN_INFO PFX
"No frequency change capabilities detected\n");
return;
}
cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
if ((edx & P_STATE_TRANSITION_CAPABLE)
!= P_STATE_TRANSITION_CAPABLE) {
printk(KERN_INFO PFX
"Power state transitions not supported\n");
return;
}
*rc = 0;
}
}
static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst,
u8 maxvid)
{
unsigned int j;
u8 lastfid = 0xff;
for (j = 0; j < data->numps; j++) {
if (pst[j].vid > LEAST_VID) {
printk(KERN_ERR FW_BUG PFX "vid %d invalid : 0x%x\n",
j, pst[j].vid);
return -EINVAL;
}
if (pst[j].vid < data->rvo) {
/* vid + rvo >= 0 */
printk(KERN_ERR FW_BUG PFX "0 vid exceeded with pstate"
" %d\n", j);
return -ENODEV;
}
if (pst[j].vid < maxvid + data->rvo) {
/* vid + rvo >= maxvid */
printk(KERN_ERR FW_BUG PFX "maxvid exceeded with pstate"
" %d\n", j);
return -ENODEV;
}
if (pst[j].fid > MAX_FID) {
printk(KERN_ERR FW_BUG PFX "maxfid exceeded with pstate"
" %d\n", j);
return -ENODEV;
}
if (j && (pst[j].fid < HI_FID_TABLE_BOTTOM)) {
/* Only first fid is allowed to be in "low" range */
printk(KERN_ERR FW_BUG PFX "two low fids - %d : "
"0x%x\n", j, pst[j].fid);
return -EINVAL;
}
if (pst[j].fid < lastfid)
lastfid = pst[j].fid;
}
if (lastfid & 1) {
printk(KERN_ERR FW_BUG PFX "lastfid invalid\n");
return -EINVAL;
}
if (lastfid > LO_FID_TABLE_TOP)
printk(KERN_INFO FW_BUG PFX
"first fid not from lo freq table\n");
return 0;
}
static void invalidate_entry(struct cpufreq_frequency_table *powernow_table,
unsigned int entry)
{
powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID;
}
static void print_basics(struct powernow_k8_data *data)
{
int j;
for (j = 0; j < data->numps; j++) {
if (data->powernow_table[j].frequency !=
CPUFREQ_ENTRY_INVALID) {
printk(KERN_INFO PFX
"fid 0x%x (%d MHz), vid 0x%x\n",
data->powernow_table[j].driver_data & 0xff,
data->powernow_table[j].frequency/1000,
data->powernow_table[j].driver_data >> 8);
}
}
if (data->batps)
printk(KERN_INFO PFX "Only %d pstates on battery\n",
data->batps);
}
static int fill_powernow_table(struct powernow_k8_data *data,
struct pst_s *pst, u8 maxvid)
{
struct cpufreq_frequency_table *powernow_table;
unsigned int j;
if (data->batps) {
/* use ACPI support to get full speed on mains power */
printk(KERN_WARNING PFX
"Only %d pstates usable (use ACPI driver for full "
"range\n", data->batps);
data->numps = data->batps;
}
for (j = 1; j < data->numps; j++) {
if (pst[j-1].fid >= pst[j].fid) {
printk(KERN_ERR PFX "PST out of sequence\n");
return -EINVAL;
}
}
if (data->numps < 2) {
printk(KERN_ERR PFX "no p states to transition\n");
return -ENODEV;
}
if (check_pst_table(data, pst, maxvid))
return -EINVAL;
powernow_table = kmalloc((sizeof(*powernow_table)
* (data->numps + 1)), GFP_KERNEL);
if (!powernow_table) {
printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
return -ENOMEM;
}
for (j = 0; j < data->numps; j++) {
int freq;
powernow_table[j].driver_data = pst[j].fid; /* lower 8 bits */
powernow_table[j].driver_data |= (pst[j].vid << 8); /* upper 8 bits */
freq = find_khz_freq_from_fid(pst[j].fid);
powernow_table[j].frequency = freq;
}
powernow_table[data->numps].frequency = CPUFREQ_TABLE_END;
powernow_table[data->numps].driver_data = 0;
if (query_current_values_with_pending_wait(data)) {
kfree(powernow_table);
return -EIO;
}
pr_debug("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid);
data->powernow_table = powernow_table;
if (cpumask_first(cpu_core_mask(data->cpu)) == data->cpu)
print_basics(data);
for (j = 0; j < data->numps; j++)
if ((pst[j].fid == data->currfid) &&
(pst[j].vid == data->currvid))
return 0;
pr_debug("currfid/vid do not match PST, ignoring\n");
return 0;
}
/* Find and validate the PSB/PST table in BIOS. */
static int find_psb_table(struct powernow_k8_data *data)
{
struct psb_s *psb;
unsigned int i;
u32 mvs;
u8 maxvid;
u32 cpst = 0;
u32 thiscpuid;
for (i = 0xc0000; i < 0xffff0; i += 0x10) {
/* Scan BIOS looking for the signature. */
/* It can not be at ffff0 - it is too big. */
psb = phys_to_virt(i);
if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0)
continue;
pr_debug("found PSB header at 0x%p\n", psb);
pr_debug("table vers: 0x%x\n", psb->tableversion);
if (psb->tableversion != PSB_VERSION_1_4) {
printk(KERN_ERR FW_BUG PFX "PSB table is not v1.4\n");
return -ENODEV;
}
pr_debug("flags: 0x%x\n", psb->flags1);
if (psb->flags1) {
printk(KERN_ERR FW_BUG PFX "unknown flags\n");
return -ENODEV;
}
data->vstable = psb->vstable;
pr_debug("voltage stabilization time: %d(*20us)\n",
data->vstable);
pr_debug("flags2: 0x%x\n", psb->flags2);
data->rvo = psb->flags2 & 3;
data->irt = ((psb->flags2) >> 2) & 3;
mvs = ((psb->flags2) >> 4) & 3;
data->vidmvs = 1 << mvs;
data->batps = ((psb->flags2) >> 6) & 3;
pr_debug("ramp voltage offset: %d\n", data->rvo);
pr_debug("isochronous relief time: %d\n", data->irt);
pr_debug("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs);
pr_debug("numpst: 0x%x\n", psb->num_tables);
cpst = psb->num_tables;
if ((psb->cpuid == 0x00000fc0) ||
(psb->cpuid == 0x00000fe0)) {
thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
if ((thiscpuid == 0x00000fc0) ||
(thiscpuid == 0x00000fe0))
cpst = 1;
}
if (cpst != 1) {
printk(KERN_ERR FW_BUG PFX "numpst must be 1\n");
return -ENODEV;
}
data->plllock = psb->plllocktime;
pr_debug("plllocktime: 0x%x (units 1us)\n", psb->plllocktime);
pr_debug("maxfid: 0x%x\n", psb->maxfid);
pr_debug("maxvid: 0x%x\n", psb->maxvid);
maxvid = psb->maxvid;
data->numps = psb->numps;
pr_debug("numpstates: 0x%x\n", data->numps);
return fill_powernow_table(data,
(struct pst_s *)(psb+1), maxvid);
}
/*
* If you see this message, complain to BIOS manufacturer. If
* he tells you "we do not support Linux" or some similar
* nonsense, remember that Windows 2000 uses the same legacy
* mechanism that the old Linux PSB driver uses. Tell them it
* is broken with Windows 2000.
*
* The reference to the AMD documentation is chapter 9 in the
* BIOS and Kernel Developer's Guide, which is available on
* www.amd.com
*/
printk(KERN_ERR FW_BUG PFX "No PSB or ACPI _PSS objects\n");
printk(KERN_ERR PFX "Make sure that your BIOS is up to date"
" and Cool'N'Quiet support is enabled in BIOS setup\n");
return -ENODEV;
}
static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data,
unsigned int index)
{
u64 control;
if (!data->acpi_data.state_count)
return;
control = data->acpi_data.states[index].control;
data->irt = (control >> IRT_SHIFT) & IRT_MASK;
data->rvo = (control >> RVO_SHIFT) & RVO_MASK;
data->exttype = (control >> EXT_TYPE_SHIFT) & EXT_TYPE_MASK;
data->plllock = (control >> PLL_L_SHIFT) & PLL_L_MASK;
data->vidmvs = 1 << ((control >> MVS_SHIFT) & MVS_MASK);
data->vstable = (control >> VST_SHIFT) & VST_MASK;
}
static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
{
struct cpufreq_frequency_table *powernow_table;
int ret_val = -ENODEV;
u64 control, status;
if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
pr_debug("register performance failed: bad ACPI data\n");
return -EIO;
}
/* verify the data contained in the ACPI structures */
if (data->acpi_data.state_count <= 1) {
pr_debug("No ACPI P-States\n");
goto err_out;
}
control = data->acpi_data.control_register.space_id;
status = data->acpi_data.status_register.space_id;
if ((control != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
(status != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
pr_debug("Invalid control/status registers (%llx - %llx)\n",
control, status);
goto err_out;
}
/* fill in data->powernow_table */
powernow_table = kmalloc((sizeof(*powernow_table)
* (data->acpi_data.state_count + 1)), GFP_KERNEL);
if (!powernow_table) {
pr_debug("powernow_table memory alloc failure\n");
goto err_out;
}
/* fill in data */
data->numps = data->acpi_data.state_count;
powernow_k8_acpi_pst_values(data, 0);
ret_val = fill_powernow_table_fidvid(data, powernow_table);
if (ret_val)
goto err_out_mem;
powernow_table[data->acpi_data.state_count].frequency =
CPUFREQ_TABLE_END;
powernow_table[data->acpi_data.state_count].driver_data = 0;
data->powernow_table = powernow_table;
if (cpumask_first(cpu_core_mask(data->cpu)) == data->cpu)
print_basics(data);
/* notify BIOS that we exist */
acpi_processor_notify_smm(THIS_MODULE);
if (!zalloc_cpumask_var(&data->acpi_data.shared_cpu_map, GFP_KERNEL)) {
printk(KERN_ERR PFX
"unable to alloc powernow_k8_data cpumask\n");
ret_val = -ENOMEM;
goto err_out_mem;
}
return 0;
err_out_mem:
kfree(powernow_table);
err_out:
acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
/* data->acpi_data.state_count informs us at ->exit()
* whether ACPI was used */
data->acpi_data.state_count = 0;
return ret_val;
}
static int fill_powernow_table_fidvid(struct powernow_k8_data *data,
struct cpufreq_frequency_table *powernow_table)
{
int i;
for (i = 0; i < data->acpi_data.state_count; i++) {
u32 fid;
u32 vid;
u32 freq, index;
u64 status, control;
if (data->exttype) {
status = data->acpi_data.states[i].status;
fid = status & EXT_FID_MASK;
vid = (status >> VID_SHIFT) & EXT_VID_MASK;
} else {
control = data->acpi_data.states[i].control;
fid = control & FID_MASK;
vid = (control >> VID_SHIFT) & VID_MASK;
}
pr_debug(" %d : fid 0x%x, vid 0x%x\n", i, fid, vid);
index = fid | (vid<<8);
powernow_table[i].driver_data = index;
freq = find_khz_freq_from_fid(fid);
powernow_table[i].frequency = freq;
/* verify frequency is OK */
if ((freq > (MAX_FREQ * 1000)) || (freq < (MIN_FREQ * 1000))) {
pr_debug("invalid freq %u kHz, ignoring\n", freq);
invalidate_entry(powernow_table, i);
continue;
}
/* verify voltage is OK -
* BIOSs are using "off" to indicate invalid */
if (vid == VID_OFF) {
pr_debug("invalid vid %u, ignoring\n", vid);
invalidate_entry(powernow_table, i);
continue;
}
if (freq != (data->acpi_data.states[i].core_frequency * 1000)) {
printk(KERN_INFO PFX "invalid freq entries "
"%u kHz vs. %u kHz\n", freq,
(unsigned int)
(data->acpi_data.states[i].core_frequency
* 1000));
invalidate_entry(powernow_table, i);
continue;
}
}
return 0;
}
static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
{
if (data->acpi_data.state_count)
acpi_processor_unregister_performance(&data->acpi_data,
data->cpu);
free_cpumask_var(data->acpi_data.shared_cpu_map);
}
static int get_transition_latency(struct powernow_k8_data *data)
{
int max_latency = 0;
int i;
for (i = 0; i < data->acpi_data.state_count; i++) {
int cur_latency = data->acpi_data.states[i].transition_latency
+ data->acpi_data.states[i].bus_master_latency;
if (cur_latency > max_latency)
max_latency = cur_latency;
}
if (max_latency == 0) {
pr_err(FW_WARN PFX "Invalid zero transition latency\n");
max_latency = 1;
}
/* value in usecs, needs to be in nanoseconds */
return 1000 * max_latency;
}
/* Take a frequency, and issue the fid/vid transition command */
static int transition_frequency_fidvid(struct powernow_k8_data *data,
unsigned int index)
{
struct cpufreq_policy *policy;
u32 fid = 0;
u32 vid = 0;
int res;
struct cpufreq_freqs freqs;
pr_debug("cpu %d transition to index %u\n", smp_processor_id(), index);
/* fid/vid correctness check for k8 */
/* fid are the lower 8 bits of the index we stored into
* the cpufreq frequency table in find_psb_table, vid
* are the upper 8 bits.
*/
fid = data->powernow_table[index].driver_data & 0xFF;
vid = (data->powernow_table[index].driver_data & 0xFF00) >> 8;
pr_debug("table matched fid 0x%x, giving vid 0x%x\n", fid, vid);
if (query_current_values_with_pending_wait(data))
return 1;
if ((data->currvid == vid) && (data->currfid == fid)) {
pr_debug("target matches current values (fid 0x%x, vid 0x%x)\n",
fid, vid);
return 0;
}
pr_debug("cpu %d, changing to fid 0x%x, vid 0x%x\n",
smp_processor_id(), fid, vid);
freqs.old = find_khz_freq_from_fid(data->currfid);
freqs.new = find_khz_freq_from_fid(fid);
policy = cpufreq_cpu_get(smp_processor_id());
cpufreq_cpu_put(policy);
cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
res = transition_fid_vid(data, fid, vid);
if (res)
freqs.new = freqs.old;
else
freqs.new = find_khz_freq_from_fid(data->currfid);
cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
return res;
}
struct powernowk8_target_arg {
struct cpufreq_policy *pol;
unsigned newstate;
};
static long powernowk8_target_fn(void *arg)
{
struct powernowk8_target_arg *pta = arg;
struct cpufreq_policy *pol = pta->pol;
unsigned newstate = pta->newstate;
struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
u32 checkfid;
u32 checkvid;
int ret;
if (!data)
return -EINVAL;
checkfid = data->currfid;
checkvid = data->currvid;
if (pending_bit_stuck()) {
printk(KERN_ERR PFX "failing targ, change pending bit set\n");
return -EIO;
}
pr_debug("targ: cpu %d, %d kHz, min %d, max %d\n",
pol->cpu, data->powernow_table[newstate].frequency, pol->min,
pol->max);
if (query_current_values_with_pending_wait(data))
return -EIO;
pr_debug("targ: curr fid 0x%x, vid 0x%x\n",
data->currfid, data->currvid);
if ((checkvid != data->currvid) ||
(checkfid != data->currfid)) {
pr_info(PFX
"error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n",
checkfid, data->currfid,
checkvid, data->currvid);
}
mutex_lock(&fidvid_mutex);
powernow_k8_acpi_pst_values(data, newstate);
ret = transition_frequency_fidvid(data, newstate);
if (ret) {
printk(KERN_ERR PFX "transition frequency failed\n");
mutex_unlock(&fidvid_mutex);
return 1;
}
mutex_unlock(&fidvid_mutex);
pol->cur = find_khz_freq_from_fid(data->currfid);
return 0;
}
/* Driver entry point to switch to the target frequency */
static int powernowk8_target(struct cpufreq_policy *pol, unsigned index)
{
struct powernowk8_target_arg pta = { .pol = pol, .newstate = index };
return work_on_cpu(pol->cpu, powernowk8_target_fn, &pta);
}
struct init_on_cpu {
struct powernow_k8_data *data;
int rc;
};
static void powernowk8_cpu_init_on_cpu(void *_init_on_cpu)
{
struct init_on_cpu *init_on_cpu = _init_on_cpu;
if (pending_bit_stuck()) {
printk(KERN_ERR PFX "failing init, change pending bit set\n");
init_on_cpu->rc = -ENODEV;
return;
}
if (query_current_values_with_pending_wait(init_on_cpu->data)) {
init_on_cpu->rc = -ENODEV;
return;
}
fidvid_msr_init();
init_on_cpu->rc = 0;
}
static const char missing_pss_msg[] =
KERN_ERR
FW_BUG PFX "No compatible ACPI _PSS objects found.\n"
FW_BUG PFX "First, make sure Cool'N'Quiet is enabled in the BIOS.\n"
FW_BUG PFX "If that doesn't help, try upgrading your BIOS.\n";
/* per CPU init entry point to the driver */
static int powernowk8_cpu_init(struct cpufreq_policy *pol)
{
struct powernow_k8_data *data;
struct init_on_cpu init_on_cpu;
int rc;
smp_call_function_single(pol->cpu, check_supported_cpu, &rc, 1);
if (rc)
return -ENODEV;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data) {
printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
return -ENOMEM;
}
data->cpu = pol->cpu;
if (powernow_k8_cpu_init_acpi(data)) {
/*
* Use the PSB BIOS structure. This is only available on
* an UP version, and is deprecated by AMD.
*/
if (num_online_cpus() != 1) {
printk_once(missing_pss_msg);
goto err_out;
}
if (pol->cpu != 0) {
printk(KERN_ERR FW_BUG PFX "No ACPI _PSS objects for "
"CPU other than CPU0. Complain to your BIOS "
"vendor.\n");
goto err_out;
}
rc = find_psb_table(data);
if (rc)
goto err_out;
/* Take a crude guess here.
* That guess was in microseconds, so multiply with 1000 */
pol->cpuinfo.transition_latency = (
((data->rvo + 8) * data->vstable * VST_UNITS_20US) +
((1 << data->irt) * 30)) * 1000;
} else /* ACPI _PSS objects available */
pol->cpuinfo.transition_latency = get_transition_latency(data);
/* only run on specific CPU from here on */
init_on_cpu.data = data;
smp_call_function_single(data->cpu, powernowk8_cpu_init_on_cpu,
&init_on_cpu, 1);
rc = init_on_cpu.rc;
if (rc != 0)
goto err_out_exit_acpi;
cpumask_copy(pol->cpus, cpu_core_mask(pol->cpu));
data->available_cores = pol->cpus;
/* min/max the cpu is capable of */
if (cpufreq_table_validate_and_show(pol, data->powernow_table)) {
printk(KERN_ERR FW_BUG PFX "invalid powernow_table\n");
powernow_k8_cpu_exit_acpi(data);
kfree(data->powernow_table);
kfree(data);
return -EINVAL;
}
pr_debug("cpu_init done, current fid 0x%x, vid 0x%x\n",
data->currfid, data->currvid);
per_cpu(powernow_data, pol->cpu) = data;
return 0;
err_out_exit_acpi:
powernow_k8_cpu_exit_acpi(data);
err_out:
kfree(data);
return -ENODEV;
}
static int powernowk8_cpu_exit(struct cpufreq_policy *pol)
{
struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
if (!data)
return -EINVAL;
powernow_k8_cpu_exit_acpi(data);
cpufreq_frequency_table_put_attr(pol->cpu);
kfree(data->powernow_table);
kfree(data);
per_cpu(powernow_data, pol->cpu) = NULL;
return 0;
}
static void query_values_on_cpu(void *_err)
{
int *err = _err;
struct powernow_k8_data *data = __this_cpu_read(powernow_data);
*err = query_current_values_with_pending_wait(data);
}
static unsigned int powernowk8_get(unsigned int cpu)
{
struct powernow_k8_data *data = per_cpu(powernow_data, cpu);
unsigned int khz = 0;
int err;
if (!data)
return 0;
smp_call_function_single(cpu, query_values_on_cpu, &err, true);
if (err)
goto out;
khz = find_khz_freq_from_fid(data->currfid);
out:
return khz;
}
static struct cpufreq_driver cpufreq_amd64_driver = {
.flags = CPUFREQ_ASYNC_NOTIFICATION,
.verify = cpufreq_generic_frequency_table_verify,
.target_index = powernowk8_target,
.bios_limit = acpi_processor_get_bios_limit,
.init = powernowk8_cpu_init,
.exit = powernowk8_cpu_exit,
.get = powernowk8_get,
.name = "powernow-k8",
.attr = cpufreq_generic_attr,
};
static void __request_acpi_cpufreq(void)
{
const char *cur_drv, *drv = "acpi-cpufreq";
cur_drv = cpufreq_get_current_driver();
if (!cur_drv)
goto request;
if (strncmp(cur_drv, drv, min_t(size_t, strlen(cur_drv), strlen(drv))))
pr_warn(PFX "WTF driver: %s\n", cur_drv);
return;
request:
pr_warn(PFX "This CPU is not supported anymore, using acpi-cpufreq instead.\n");
request_module(drv);
}
/* driver entry point for init */
static int powernowk8_init(void)
{
unsigned int i, supported_cpus = 0;
int ret;
if (static_cpu_has(X86_FEATURE_HW_PSTATE)) {
__request_acpi_cpufreq();
return -ENODEV;
}
if (!x86_match_cpu(powernow_k8_ids))
return -ENODEV;
get_online_cpus();
for_each_online_cpu(i) {
smp_call_function_single(i, check_supported_cpu, &ret, 1);
if (!ret)
supported_cpus++;
}
if (supported_cpus != num_online_cpus()) {
put_online_cpus();
return -ENODEV;
}
put_online_cpus();
ret = cpufreq_register_driver(&cpufreq_amd64_driver);
if (ret)
return ret;
pr_info(PFX "Found %d %s (%d cpu cores) (" VERSION ")\n",
num_online_nodes(), boot_cpu_data.x86_model_id, supported_cpus);
return ret;
}
/* driver entry point for term */
static void __exit powernowk8_exit(void)
{
pr_debug("exit\n");
cpufreq_unregister_driver(&cpufreq_amd64_driver);
}
MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and "
"Mark Langsdorf <mark.langsdorf@amd.com>");
MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
MODULE_LICENSE("GPL");
late_initcall(powernowk8_init);
module_exit(powernowk8_exit);
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