[CPUFREQ] dual-core powernow-k8
With the release of the dual-core AMD Opterons last week, it's high time that cpufreq supported them. The attached patch applies cleanly to 2.6.12-rc3 and updates powernow-k8 to support the latest Athlon 64 and Opteron processors. Update the driver to version 1.40.0 and provide support for dual-core processors. Signed-off-by: Mark Langsdorf <mark.langsdorf@amd.com> Signed-off-by: Dave Jones <davej@redhat.com>hifive-unleashed-5.1
Dave Jones
parent
7f335d4ef2
commit
065b807ca1
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@ -4,7 +4,7 @@
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* GNU general public license version 2. See "COPYING" or
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* http://www.gnu.org/licenses/gpl.html
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*
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* Support : paul.devriendt@amd.com
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* Support : mark.langsdorf@amd.com
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*
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* Based on the powernow-k7.c module written by Dave Jones.
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* (C) 2003 Dave Jones <davej@codemonkey.org.uk> on behalf of SuSE Labs
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@ -15,12 +15,13 @@
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*
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* Valuable input gratefully received from Dave Jones, Pavel Machek,
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* Dominik Brodowski, and others.
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* Originally developed by Paul Devriendt.
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* Processor information obtained from Chapter 9 (Power and Thermal Management)
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* of the "BIOS and Kernel Developer's Guide for the AMD Athlon 64 and AMD
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* Opteron Processors" available for download from www.amd.com
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*
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* Tables for specific CPUs can be infrerred from
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* http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/30430.pdf
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* http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/30430.pdf
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*/
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#include <linux/kernel.h>
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@ -30,6 +31,7 @@
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#include <linux/cpufreq.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/cpumask.h>
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#include <asm/msr.h>
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#include <asm/io.h>
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@ -42,7 +44,7 @@
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#define PFX "powernow-k8: "
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#define BFX PFX "BIOS error: "
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#define VERSION "version 1.00.09e"
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#define VERSION "version 1.40.2"
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#include "powernow-k8.h"
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/* serialize freq changes */
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@ -50,6 +52,10 @@ static DECLARE_MUTEX(fidvid_sem);
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static struct powernow_k8_data *powernow_data[NR_CPUS];
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#ifndef CONFIG_SMP
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static cpumask_t cpu_core_map[1];
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#endif
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/* Return a frequency in MHz, given an input fid */
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static u32 find_freq_from_fid(u32 fid)
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{
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@ -274,11 +280,18 @@ static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid
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{
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u32 rvosteps = data->rvo;
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u32 savefid = data->currfid;
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u32 maxvid, lo;
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dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, reqvid 0x%x, rvo 0x%x\n",
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smp_processor_id(),
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data->currfid, data->currvid, reqvid, data->rvo);
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rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
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maxvid = 0x1f & (maxvid >> 16);
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dprintk("ph1 maxvid=0x%x\n", maxvid);
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if (reqvid < maxvid) /* lower numbers are higher voltages */
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reqvid = maxvid;
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while (data->currvid > reqvid) {
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dprintk("ph1: curr 0x%x, req vid 0x%x\n",
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data->currvid, reqvid);
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@ -286,8 +299,8 @@ static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid
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return 1;
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}
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while ((rvosteps > 0) && ((data->rvo + data->currvid) > reqvid)) {
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if (data->currvid == 0) {
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while ((rvosteps > 0) && ((data->rvo + data->currvid) > reqvid)) {
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if (data->currvid == maxvid) {
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rvosteps = 0;
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} else {
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dprintk("ph1: changing vid for rvo, req 0x%x\n",
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@ -671,7 +684,7 @@ static int find_psb_table(struct powernow_k8_data *data)
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* BIOS and Kernel Developer's Guide, which is available on
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* www.amd.com
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*/
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printk(KERN_ERR PFX "BIOS error - no PSB\n");
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printk(KERN_INFO PFX "BIOS error - no PSB or ACPI _PSS objects\n");
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return -ENODEV;
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}
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@ -695,7 +708,7 @@ static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
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struct cpufreq_frequency_table *powernow_table;
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if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
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dprintk("register performance failed\n");
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dprintk("register performance failed: bad ACPI data\n");
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return -EIO;
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}
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@ -746,22 +759,23 @@ static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
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continue;
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}
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if (fid < HI_FID_TABLE_BOTTOM) {
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if (cntlofreq) {
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/* if both entries are the same, ignore this
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* one...
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*/
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if ((powernow_table[i].frequency != powernow_table[cntlofreq].frequency) ||
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(powernow_table[i].index != powernow_table[cntlofreq].index)) {
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printk(KERN_ERR PFX "Too many lo freq table entries\n");
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goto err_out_mem;
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}
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dprintk("double low frequency table entry, ignoring it.\n");
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powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
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continue;
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} else
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cntlofreq = i;
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/* verify only 1 entry from the lo frequency table */
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if (fid < HI_FID_TABLE_BOTTOM) {
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if (cntlofreq) {
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/* if both entries are the same, ignore this
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* one...
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*/
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if ((powernow_table[i].frequency != powernow_table[cntlofreq].frequency) ||
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(powernow_table[i].index != powernow_table[cntlofreq].index)) {
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printk(KERN_ERR PFX "Too many lo freq table entries\n");
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goto err_out_mem;
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}
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dprintk("double low frequency table entry, ignoring it.\n");
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powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
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continue;
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} else
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cntlofreq = i;
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}
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if (powernow_table[i].frequency != (data->acpi_data.states[i].core_frequency * 1000)) {
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@ -816,7 +830,7 @@ static int transition_frequency(struct powernow_k8_data *data, unsigned int inde
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{
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u32 fid;
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u32 vid;
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int res;
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int res, i;
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struct cpufreq_freqs freqs;
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dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
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@ -841,7 +855,8 @@ static int transition_frequency(struct powernow_k8_data *data, unsigned int inde
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}
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if ((fid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
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printk("ignoring illegal change in lo freq table-%x to 0x%x\n",
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printk(KERN_ERR PFX
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"ignoring illegal change in lo freq table-%x to 0x%x\n",
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data->currfid, fid);
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return 1;
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}
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@ -850,18 +865,20 @@ static int transition_frequency(struct powernow_k8_data *data, unsigned int inde
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smp_processor_id(), fid, vid);
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freqs.cpu = data->cpu;
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freqs.old = find_khz_freq_from_fid(data->currfid);
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freqs.new = find_khz_freq_from_fid(fid);
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cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
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for_each_cpu_mask(i, cpu_core_map[data->cpu]) {
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freqs.cpu = i;
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cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
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}
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down(&fidvid_sem);
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res = transition_fid_vid(data, fid, vid);
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up(&fidvid_sem);
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freqs.new = find_khz_freq_from_fid(data->currfid);
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cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
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for_each_cpu_mask(i, cpu_core_map[data->cpu]) {
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freqs.cpu = i;
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cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
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}
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return res;
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}
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@ -874,6 +891,7 @@ static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsi
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u32 checkvid = data->currvid;
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unsigned int newstate;
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int ret = -EIO;
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int i;
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/* only run on specific CPU from here on */
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oldmask = current->cpus_allowed;
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@ -902,22 +920,41 @@ static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsi
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data->currfid, data->currvid);
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if ((checkvid != data->currvid) || (checkfid != data->currfid)) {
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printk(KERN_ERR PFX
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"error - out of sync, fid 0x%x 0x%x, vid 0x%x 0x%x\n",
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checkfid, data->currfid, checkvid, data->currvid);
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printk(KERN_INFO PFX
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"error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n",
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checkfid, data->currfid, checkvid, data->currvid);
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}
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if (cpufreq_frequency_table_target(pol, data->powernow_table, targfreq, relation, &newstate))
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goto err_out;
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down(&fidvid_sem);
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for_each_cpu_mask(i, cpu_core_map[pol->cpu]) {
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/* make sure the sibling is initialized */
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if (!powernow_data[i]) {
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ret = 0;
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up(&fidvid_sem);
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goto err_out;
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}
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}
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powernow_k8_acpi_pst_values(data, newstate);
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if (transition_frequency(data, newstate)) {
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printk(KERN_ERR PFX "transition frequency failed\n");
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ret = 1;
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up(&fidvid_sem);
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goto err_out;
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}
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/* Update all the fid/vids of our siblings */
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for_each_cpu_mask(i, cpu_core_map[pol->cpu]) {
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powernow_data[i]->currvid = data->currvid;
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powernow_data[i]->currfid = data->currfid;
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}
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up(&fidvid_sem);
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pol->cur = find_khz_freq_from_fid(data->currfid);
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ret = 0;
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@ -962,7 +999,7 @@ static int __init powernowk8_cpu_init(struct cpufreq_policy *pol)
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*/
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if ((num_online_cpus() != 1) || (num_possible_cpus() != 1)) {
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printk(KERN_INFO PFX "MP systems not supported by PSB BIOS structure\n");
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printk(KERN_ERR PFX "MP systems not supported by PSB BIOS structure\n");
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kfree(data);
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return -ENODEV;
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}
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@ -1003,6 +1040,7 @@ static int __init powernowk8_cpu_init(struct cpufreq_policy *pol)
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schedule();
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pol->governor = CPUFREQ_DEFAULT_GOVERNOR;
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pol->cpus = cpu_core_map[pol->cpu];
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/* Take a crude guess here.
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* That guess was in microseconds, so multiply with 1000 */
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@ -1069,7 +1107,7 @@ static unsigned int powernowk8_get (unsigned int cpu)
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return 0;
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}
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preempt_disable();
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if (query_current_values_with_pending_wait(data))
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goto out;
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@ -1127,9 +1165,10 @@ static void __exit powernowk8_exit(void)
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cpufreq_unregister_driver(&cpufreq_amd64_driver);
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}
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MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com>");
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MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and Mark Langsdorf <mark.langsdorf@amd.com.");
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MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
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MODULE_LICENSE("GPL");
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late_initcall(powernowk8_init);
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module_exit(powernowk8_exit);
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@ -174,3 +174,18 @@ static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvi
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static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid);
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static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index);
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#ifndef for_each_cpu_mask
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#define for_each_cpu_mask(i,mask) for (i=0;i<1;i++)
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#endif
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#ifdef CONFIG_SMP
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static inline void define_siblings(int cpu, cpumask_t cpu_sharedcore_mask[])
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{
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}
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#else
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static inline void define_siblings(int cpu, cpumask_t cpu_sharedcore_mask[])
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{
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cpu_set(0, cpu_sharedcore_mask[0]);
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}
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#endif
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