path: root/drivers/s390/scsi/zfcp_dbf.c

/*
 * This file is part of the zfcp device driver for
 * FCP adapters for IBM System z9 and zSeries.
 *
 * (C) Copyright IBM Corp. 2002, 2006
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <asm/debug.h>
#include <linux/ctype.h>
#include "zfcp_ext.h"

static u32 dbfsize = 4;

module_param(dbfsize, uint, 0400);
MODULE_PARM_DESC(dbfsize,
		 "number of pages for each debug feature area (default 4)");

#define ZFCP_LOG_AREA			ZFCP_LOG_AREA_OTHER

static int
zfcp_dbf_stck(char *out_buf, const char *label, unsigned long long stck)
{
	unsigned long long sec;
	struct timespec xtime;
	int len = 0;

	stck -= 0x8126d60e46000000LL - (0x3c26700LL * 1000000 * 4096);
	sec = stck >> 12;
	do_div(sec, 1000000);
	xtime.tv_sec = sec;
	stck -= (sec * 1000000) << 12;
	xtime.tv_nsec = ((stck * 1000) >> 12);
	len += sprintf(out_buf + len, "%-24s%011lu:%06lu\n",
		       label, xtime.tv_sec, xtime.tv_nsec);

	return len;
}

static int zfcp_dbf_tag(char *out_buf, const char *label, const char *tag)
{
	int len = 0, i;

	len += sprintf(out_buf + len, "%-24s", label);
	for (i = 0; i < ZFCP_DBF_TAG_SIZE; i++)
		len += sprintf(out_buf + len, "%c", tag[i]);
	len += sprintf(out_buf + len, "\n");

	return len;
}

static int
zfcp_dbf_view(char *out_buf, const char *label, const char *format, ...)
{
	va_list arg;
	int len = 0;

	len += sprintf(out_buf + len, "%-24s", label);
	va_start(arg, format);
	len += vsprintf(out_buf + len, format, arg);
	va_end(arg);
	len += sprintf(out_buf + len, "\n");

	return len;
}

static int
zfcp_dbf_view_dump(char *out_buf, const char *label,
		   char *buffer, int buflen, int offset, int total_size)
{
	int len = 0;

	if (offset == 0)
		len += sprintf(out_buf + len, "%-24s  ", label);

	while (buflen--) {
		if (offset > 0) {
			if ((offset % 32) == 0)
				len += sprintf(out_buf + len, "\n%-24c  ", ' ');
			else if ((offset % 4) == 0)
				len += sprintf(out_buf + len, " ");
		}
		len += sprintf(out_buf + len, "%02x", *buffer++);
		if (++offset == total_size) {
			len += sprintf(out_buf + len, "\n");
			break;
		}
	}

	if (total_size == 0)
		len += sprintf(out_buf + len, "\n");

	return len;
}

static int
zfcp_dbf_view_header(debug_info_t * id, struct debug_view *view, int area,
		     debug_entry_t * entry, char *out_buf)
{
	struct zfcp_dbf_dump *dump = (struct zfcp_dbf_dump *)DEBUG_DATA(entry);
	int len = 0;

	if (strncmp(dump->tag, "dump", ZFCP_DBF_TAG_SIZE) != 0) {
		len += zfcp_dbf_stck(out_buf + len, "timestamp",
				     entry->id.stck);
		len += zfcp_dbf_view(out_buf + len, "cpu", "%02i",
				     entry->id.fields.cpuid);
	} else {
		len += zfcp_dbf_view_dump(