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s390/cio: introduce pathmask_to_pos 

We often need to correlate an 8 bit path mask with the position
in a channel path array. Introduce and use pathmask_to_pos for
that task.

Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2015-09-21 18:40:33 +02:00 committed by Martin Schwidefsky
parent ab97d211ef
commit 9d49f86dab
3 changed files with 16 additions and 9 deletions
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10
arch/s390/include/asm/cio.h
View File

@ -5,6 +5,7 @@
#define _ASM_S390_CIO_H_
#include <linux/spinlock.h>
#include <linux/bitops.h>
#include <asm/types.h>
#define LPM_ANYPATH 0xff
@ -296,6 +297,15 @@ static inline int ccw_dev_id_is_equal(struct ccw_dev_id *dev_id1,
return 0;
}
/**
* pathmask_to_pos() - find the position of the left-most bit in a pathmask
* @mask: pathmask with at least one bit set
*/
static inline u8 pathmask_to_pos(u8 mask)
{
return 8 - ffs(mask);
}
void channel_subsystem_reinit(void);
extern void css_schedule_reprobe(void);

11
drivers/s390/block/dasd_eckd.c
View File

@ -1068,8 +1068,7 @@ static int dasd_eckd_read_conf(struct dasd_device *device)
path_data->opm |= lpm;
continue; /* no error */
}
/* translate path mask to position in mask */
pos = 8 - ffs(lpm);
pos = pathmask_to_pos(lpm);
kfree(private->path_conf_data[pos]);
if ((__u8 *)private->path_conf_data[pos] ==
private->conf_data) {
@ -4671,7 +4670,7 @@ static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device,
return conf_data;
}
out:
return private->path_conf_data[8 - ffs(lpum)];
return private->path_conf_data[pathmask_to_pos(lpum)];
}
/*
@ -4716,7 +4715,7 @@ static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum,
for (path = 0x80; path; path >>= 1) {
/* initialise data per path */
bitmask = mask;
pos = 8 - ffs(path);
pos = pathmask_to_pos(path);
conf_data = private->path_conf_data[pos];
pos = 8 - ffs(cuir->ned_map);
ned = (char *) &conf_data->neds[pos];
@ -4937,9 +4936,7 @@ static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2],
((u32 *)cuir)[3]);
ccw_device_get_schid(device->cdev, &sch_id);
/* get position of path in mask */
pos = 8 - ffs(lpum);
/* get channel path descriptor from this position */
pos = pathmask_to_pos(lpum);
desc = ccw_device_get_chp_desc(device->cdev, pos);
if (cuir->code == CUIR_QUIESCE) {

4
drivers/s390/cio/device_pgid.c
View File

@ -133,7 +133,7 @@ static void spid_build_cp(struct ccw_device *cdev, u8 fn)
{
struct ccw_request *req = &cdev->private->req;
struct ccw1 *cp = cdev->private->iccws;
int i = 8 - ffs(req->lpm);
int i = pathmask_to_pos(req->lpm);
struct pgid *pgid = &cdev->private->pgid[i];
pgid->inf.fc = fn;
@ -434,7 +434,7 @@ static void snid_build_cp(struct ccw_device *cdev)
{
struct ccw_request *req = &cdev->private->req;
struct ccw1 *cp = cdev->private->iccws;
int i = 8 - ffs(req->lpm);
int i = pathmask_to_pos(req->lpm);
/* Channel program setup. */
cp->cmd_code = CCW_CMD_SENSE_PGID;