Re: powernow-k8 woes -- need help diagnosing intermittent failure

[Bruno Ducrot <ducrot@poupinou.org>]

On Mon, Aug 08, 2005 at 10:37:06PM -0400, John Belmonte wrote:
> Bruno Ducrot wrote:
> > What is the frequency of the system clock?
> > 
> > Cheers,
> 
> Hi Bruno,
> 
> The system clock is set at the default 200MHz (no overclocking).

Well, there is two possibility I believe:
   - hardware fault;
   - bad parameter given by the bios.

In order to check point 2, could you please:

wget ftp://ftp.kernel.org//pub/linux/kernel/people/lenb/acpi/utils/pmtools-20031210.tar.bz2
tar xjvfp pmtools-20031210.tar.bz2
cd pmtools-20031210/acpidmp
make
sudo ./acpidmp > acpidmp.out
bzip2 acpidmp.out 

Then mail me privately the acpidmp.out.bz2

It's also possible that you do not use ACPI at all, in that case send me
the output of the following little tool (I just wrotten it, it may
be broken somehow though because I don't have handy my amd64 desktop
and it will certainly give false frequency values, as well as
false voltages values, but I care only about first values)

Cheers,

-- 
Bruno Ducrot

--  Which is worse:  ignorance or apathy?
--  Don't know.  Don't care.

#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <sys/mman.h>

#define LEN (0x100000 - 0xc0000)
#define OFFSET (0xc0000)

#ifndef __packed
#define __packed __attribute((packed))
#endif

static const int fid_to_mult[32] = {
	110, 115, 120, 125, 50, 55, 60, 65,
	70, 75, 80, 85, 90, 95, 100, 105,
	30, 190, 40, 200, 130, 135, 140, 210,
	150, 225, 160, 165, 170, 180, -1, -1,
};

static const int vid_to_voltage[32] = {
	2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650,
	1600, 1550, 1500, 1450, 1400, 1350, 1300, 0,
	1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100,
	1075, 1050, 1024, 1000, 975, 950, 925, 0,
}; 

struct psb_header {
	char signature[10];
	u_char version;
	u_char flags;
	u_short settlingtime;
	u_char res1;
	u_char numpst;
} __packed;

struct pst_header {
	u_int32_t cpuid;
	u_char fsb;
	u_char maxfid;
	u_char startvid;
	u_char numpstates;
} __packed;

static u_int fsb;
static u_int sgtc;

static int
decode_pst(char *p, int npstates)
{
	int i;
	int freq, fid, vid;

	for (i = 0; i < npstates; ++i) {
		fid = *p++;
		vid = *p++;
		freq = 100 * fid_to_mult[fid] * fsb;

		printf("   %2d %8dkHz  FID %02x (%2d.%01d)  VID %02x (%4dmV)\n",
		       i,
		       freq,
		       fid, fid_to_mult[fid]/10, fid_to_mult[fid]%10,
		       vid, vid_to_voltage[vid]);
	}

	return 0;
}

static
void decode_psb(char *p, int numpst)
{
	int i;
	struct psb_header *psb;
	struct pst_header *pst;

	psb = (struct psb_header*) p;

	if (psb->version != 0x14)
		return;

	printf("PSB version: %hhx flags: %hhx settling time %hhuus res1 %hhx num pst %hhu\n",
			psb->version,
			psb->flags,
			psb->settlingtime,
			psb->res1,
			psb->numpst);
	sgtc = psb->settlingtime * 100;

	if (sgtc < 10000)
		sgtc = 10000;

	p = ((char *) psb) + sizeof(struct psb_header);

	if (numpst < 0)
		numpst = psb->numpst;
	else
		printf("Overriding number of pst :%d\n", numpst);

	for (i = 0; i < numpst; i++) {
		pst = (struct pst_header*) p;

		printf("  PST %d  cpuid %.3x fsb %hhu mfid %hhx svid %hhx numberstates %hhu\n",
				i+1,
				pst->cpuid,
				pst->fsb,
				pst->maxfid,
				pst->startvid,
				pst->numpstates);

		fsb = pst->fsb;
		decode_pst(p + sizeof(struct pst_header), pst->numpstates);
		p += sizeof(struct pst_header) + 2*pst->numpstates;
	}

}

int
main(int argc, char *argv[])
{
	int fd;
	int numpst;
	char *mem = NULL;
	char *p;

	if (argc < 2)
		numpst = -1;
	else
		numpst = strtoul(argv[1], NULL, 0);

	fd = open("/dev/mem", O_RDONLY);
	if (fd < 0) {
		exit(1);
	}

	mem = mmap(mem, 0x100000 - 0xc0000, PROT_READ, MAP_SHARED, fd, 0xc0000);
	close(fd);

	for (p = mem; p - mem < LEN; p+=16) {
		if (memcmp(p, "AMDK7PNOW!", 10) == 0) {
			decode_psb(p, numpst);
			break;
		}
	}

	munmap(mem, LEN);
	return 0;
}