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s390/cio: introduce CIO debugfs directory

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This patch introduces an s390 Common I/O layer debugfs directory that is
intended to provide access to debugging-related CIO functions and data.
The directory is created as /sys/kernel/debug/s390/cio

Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Vineeth Vijayan 2021-02-04 07:03:00 +01:00 committed by Heiko Carstens
parent dee60c0dbc
commit 64a715ab4e
3 changed files with 27 additions and 1 deletions
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2
drivers/s390/cio/Makefile
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@ -8,7 +8,7 @@ CFLAGS_trace.o := -I$(src)
CFLAGS_vfio_ccw_trace.o := -I$(src)
obj-y += airq.o blacklist.o chsc.o cio.o css.o chp.o idset.o isc.o \
fcx.o itcw.o crw.o ccwreq.o trace.o ioasm.o
fcx.o itcw.o crw.o ccwreq.o trace.o ioasm.o cio_debugfs.o
ccw_device-objs += device.o device_fsm.o device_ops.o
ccw_device-objs += device_id.o device_pgid.o device_status.o
obj-y += ccw_device.o cmf.o

3
drivers/s390/cio/cio_debug.h
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@ -26,4 +26,7 @@ static inline void CIO_HEX_EVENT(int level, void *data, int length)
debug_event(cio_debug_trace_id, level, data, length);
}
/* For the CIO debugfs related features */
extern struct dentry *cio_debugfs_dir;
#endif

23
drivers/s390/cio/cio_debugfs.c Normal file
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@ -0,0 +1,23 @@
// SPDX-License-Identifier: GPL-2.0
/*
* S/390 common I/O debugfs interface
*
* Copyright IBM Corp. 2021
* Author(s): Vineeth Vijayan <vneethv@linux.ibm.com>
*/
#include <linux/debugfs.h>
#include "cio_debug.h"
struct dentry *cio_debugfs_dir;
/* Create the debugfs directory for CIO under the arch_debugfs_dir
* i.e /sys/kernel/debug/s390/cio
*/
static int __init cio_debugfs_init(void)
{
cio_debugfs_dir = debugfs_create_dir("cio", arch_debugfs_dir);
return 0;
}
subsys_initcall(cio_debugfs_init);