linux/drivers/s390/net/ctcdbug.c
Michael Holzheu 66a464dbc8 [PATCH] s390: debug feature changes
This patch changes the memory allocation method for the s390 debug feature.
Trace buffers had been allocated using the get_free_pages() function before.
Therefore it was not possible to get big memory areas in a running system due
to memory fragmentation.  Now the trace buffers are subdivided into several
subbuffers with pagesize.  Therefore it is now possible to allocate more
memory for the trace buffers and more trace records can be written.

In addition to that, dynamic specification of the size of the trace buffers is
implemented.  It is now possible to change the size of a trace buffer using a
new debugfs file instance.  When writing a number into this file, the trace
buffer size is changed to 'number * pagesize'.

In the past all the traces could be obtained from userspace by accessing files
in the "proc" filesystem.  Now with debugfs we have a new filesystem which
should be used for debugging purposes.  This patch moves the debug feature
from procfs to debugfs.

Since the interface of debug_register() changed, all device drivers, which use
the debug feature had to be adjusted.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-25 16:24:37 -07:00

83 lines
2.3 KiB
C

/*
*
* linux/drivers/s390/net/ctcdbug.c ($Revision: 1.6 $)
*
* CTC / ESCON network driver - s390 dbf exploit.
*
* Copyright 2000,2003 IBM Corporation
*
* Author(s): Original Code written by
* Peter Tiedemann (ptiedem@de.ibm.com)
*
* $Revision: 1.6 $ $Date: 2005/05/11 08:10:17 $
*
* 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 "ctcdbug.h"
/**
* Debug Facility Stuff
*/
debug_info_t *ctc_dbf_setup = NULL;
debug_info_t *ctc_dbf_data = NULL;
debug_info_t *ctc_dbf_trace = NULL;
DEFINE_PER_CPU(char[256], ctc_dbf_txt_buf);
void
ctc_unregister_dbf_views(void)
{
if (ctc_dbf_setup)
debug_unregister(ctc_dbf_setup);
if (ctc_dbf_data)
debug_unregister(ctc_dbf_data);
if (ctc_dbf_trace)
debug_unregister(ctc_dbf_trace);
}
int
ctc_register_dbf_views(void)
{
ctc_dbf_setup = debug_register(CTC_DBF_SETUP_NAME,
CTC_DBF_SETUP_PAGES,
CTC_DBF_SETUP_NR_AREAS,
CTC_DBF_SETUP_LEN);
ctc_dbf_data = debug_register(CTC_DBF_DATA_NAME,
CTC_DBF_DATA_PAGES,
CTC_DBF_DATA_NR_AREAS,
CTC_DBF_DATA_LEN);
ctc_dbf_trace = debug_register(CTC_DBF_TRACE_NAME,
CTC_DBF_TRACE_PAGES,
CTC_DBF_TRACE_NR_AREAS,
CTC_DBF_TRACE_LEN);
if ((ctc_dbf_setup == NULL) || (ctc_dbf_data == NULL) ||
(ctc_dbf_trace == NULL)) {
ctc_unregister_dbf_views();
return -ENOMEM;
}
debug_register_view(ctc_dbf_setup, &debug_hex_ascii_view);
debug_set_level(ctc_dbf_setup, CTC_DBF_SETUP_LEVEL);
debug_register_view(ctc_dbf_data, &debug_hex_ascii_view);
debug_set_level(ctc_dbf_data, CTC_DBF_DATA_LEVEL);
debug_register_view(ctc_dbf_trace, &debug_hex_ascii_view);
debug_set_level(ctc_dbf_trace, CTC_DBF_TRACE_LEVEL);
return 0;
}