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CPUFREQ: powernow-k8: Try to detect old BIOS, not supporting CPU freq on a recent AMD CPUs.

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Make use of FW_BUG interface to give vendors and users the ability to
automatically check for powernow-k8 related BIOS bugs by:
dmesg |grep "Firmware Bug"

Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Thomas Renninger 2008-09-01 14:27:03 +02:00 committed by Len Brown
parent 910dfae298
commit 2fd47094f9
1 changed files with 24 additions and 18 deletions
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42
arch/x86/kernel/cpu/cpufreq/powernow-k8.c
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@ -45,7 +45,6 @@
#endif #endif
#define PFX "powernow-k8: " #define PFX "powernow-k8: "
#define BFX PFX "BIOS error: "
#define VERSION "version 2.20.00" #define VERSION "version 2.20.00"
#include "powernow-k8.h" #include "powernow-k8.h"
@ -536,35 +535,40 @@ static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst, u8
for (j = 0; j < data->numps; j++) { for (j = 0; j < data->numps; j++) {
if (pst[j].vid > LEAST_VID) { if (pst[j].vid > LEAST_VID) {
printk(KERN_ERR PFX "vid %d invalid : 0x%x\n", j, pst[j].vid); printk(KERN_ERR FW_BUG PFX "vid %d invalid : 0x%x\n",
j, pst[j].vid);
return -EINVAL; return -EINVAL;
} }
if (pst[j].vid < data->rvo) { /* vid + rvo >= 0 */ if (pst[j].vid < data->rvo) { /* vid + rvo >= 0 */
printk(KERN_ERR BFX "0 vid exceeded with pstate %d\n", j); printk(KERN_ERR FW_BUG PFX "0 vid exceeded with pstate"
" %d\n", j);
return -ENODEV; return -ENODEV;
} }
if (pst[j].vid < maxvid + data->rvo) { /* vid + rvo >= maxvid */ if (pst[j].vid < maxvid + data->rvo) { /* vid + rvo >= maxvid */
printk(KERN_ERR BFX "maxvid exceeded with pstate %d\n", j); printk(KERN_ERR FW_BUG PFX "maxvid exceeded with pstate"
" %d\n", j);
return -ENODEV; return -ENODEV;
} }
if (pst[j].fid > MAX_FID) { if (pst[j].fid > MAX_FID) {
printk(KERN_ERR BFX "maxfid exceeded with pstate %d\n", j); printk(KERN_ERR FW_BUG PFX "maxfid exceeded with pstate"
" %d\n", j);
return -ENODEV; return -ENODEV;
} }
if (j && (pst[j].fid < HI_FID_TABLE_BOTTOM)) { if (j && (pst[j].fid < HI_FID_TABLE_BOTTOM)) {
/* Only first fid is allowed to be in "low" range */ /* Only first fid is allowed to be in "low" range */
printk(KERN_ERR BFX "two low fids - %d : 0x%x\n", j, pst[j].fid); printk(KERN_ERR FW_BUG PFX "two low fids - %d : "
"0x%x\n", j, pst[j].fid);
return -EINVAL; return -EINVAL;
} }
if (pst[j].fid < lastfid) if (pst[j].fid < lastfid)
lastfid = pst[j].fid; lastfid = pst[j].fid;
} }
if (lastfid & 1) { if (lastfid & 1) {
printk(KERN_ERR BFX "lastfid invalid\n"); printk(KERN_ERR FW_BUG PFX "lastfid invalid\n");
return -EINVAL; return -EINVAL;
} }
if (lastfid > LO_FID_TABLE_TOP) if (lastfid > LO_FID_TABLE_TOP)
printk(KERN_INFO BFX "first fid not from lo freq table\n"); printk(KERN_INFO FW_BUG PFX "first fid not from lo freq table\n");
return 0; return 0;
} }
@ -672,13 +676,13 @@ static int find_psb_table(struct powernow_k8_data *data)
dprintk("table vers: 0x%x\n", psb->tableversion); dprintk("table vers: 0x%x\n", psb->tableversion);
if (psb->tableversion != PSB_VERSION_1_4) { if (psb->tableversion != PSB_VERSION_1_4) {
printk(KERN_ERR BFX "PSB table is not v1.4\n"); printk(KERN_ERR FW_BUG PFX "PSB table is not v1.4\n");
return -ENODEV; return -ENODEV;
} }
dprintk("flags: 0x%x\n", psb->flags1); dprintk("flags: 0x%x\n", psb->flags1);
if (psb->flags1) { if (psb->flags1) {
printk(KERN_ERR BFX "unknown flags\n"); printk(KERN_ERR FW_BUG PFX "unknown flags\n");
return -ENODEV; return -ENODEV;
} }
@ -705,7 +709,7 @@ static int find_psb_table(struct powernow_k8_data *data)
} }
} }
if (cpst != 1) { if (cpst != 1) {
printk(KERN_ERR BFX "numpst must be 1\n"); printk(KERN_ERR FW_BUG PFX "numpst must be 1\n");
return -ENODEV; return -ENODEV;
} }
@ -1130,17 +1134,19 @@ static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
"ACPI Processor module before starting this " "ACPI Processor module before starting this "
"driver.\n"); "driver.\n");
#else #else
printk(KERN_ERR PFX "Your BIOS does not provide ACPI " printk(KERN_ERR FW_BUG PFX "Your BIOS does not provide"
"_PSS objects in a way that Linux understands. " " ACPI _PSS objects in a way that Linux "
"Please report this to the Linux ACPI maintainers" "understands. Please report this to the Linux "
" and complain to your BIOS vendor.\n"); "ACPI maintainers and complain to your BIOS "
"vendor.\n");
#endif #endif
kfree(data); kfree(data);
return -ENODEV; return -ENODEV;
} }
if (pol->cpu != 0) { if (pol->cpu != 0) {
printk(KERN_ERR PFX "No ACPI _PSS objects for CPU other than " printk(KERN_ERR FW_BUG PFX "No ACPI _PSS objects for "
"CPU0. Complain to your BIOS vendor.\n"); "CPU other than CPU0. Complain to your BIOS "
"vendor.\n");
kfree(data); kfree(data);
return -ENODEV; return -ENODEV;
} }
@ -1193,7 +1199,7 @@ static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
/* min/max the cpu is capable of */ /* min/max the cpu is capable of */
if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) { if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) {
printk(KERN_ERR PFX "invalid powernow_table\n"); printk(KERN_ERR FW_BUG PFX "invalid powernow_table\n");
powernow_k8_cpu_exit_acpi(data); powernow_k8_cpu_exit_acpi(data);
kfree(data->powernow_table); kfree(data->powernow_table);
kfree(data); kfree(data);