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s390/css: reduce stsch calls

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Both css_evaluate_new_subchannel and cio_validate_subchannel used
stsch and css_sch_is_valid to check for a valid device.

Reduce stsch calls during subchannel evaluation by re-using schib
data. Also the type/devno valid information is only checked once.

Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott
2018-06-26 15:09:32 +02:00
committed by Martin Schwidefsky
parent 05b217f4c5
commit d4f5d79e97
4 changed files with 57 additions and 79 deletions
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3
drivers/s390/cio/css.h
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@@ -103,7 +103,8 @@ extern void css_driver_unregister(struct css_driver *);
extern void css_sch_device_unregister(struct subchannel *);
extern int css_register_subchannel(struct subchannel *);
extern struct subchannel *css_alloc_subchannel(struct subchannel_id);
extern struct subchannel *css_alloc_subchannel(struct subchannel_id,
struct schib *schib);
extern struct subchannel *get_subchannel_by_schid(struct subchannel_id);
extern int css_init_done;
extern int max_ssid;