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linux/drivers/s390/cio/idset.h

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[S390] cio: replace subchannel evaluation queue with bitmap Use a bitmap for indicating which subchannels require evaluation instead of allocating memory for each evaluation request. This approach reduces memory consumption during recovery in case of massive evaluation request occurrence and removes the need for memory allocation failure handling. Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2007-04-27 07:01:34 -07:00
/*
* drivers/s390/cio/idset.h
*
* Copyright IBM Corp. 2007
* Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
*/
#ifndef S390_IDSET_H
#define S390_IDSET_H S390_IDSET_H
[S390] cio: Add chsc subchannel driver. This patch adds a driver for subchannels of type chsc. A device /dev/chsc is created which may be used to issue ioctls to: - obtain information about the machine's I/O configuration - dynamically change the machine's I/O configuration via asynchronous chsc commands Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2008-07-14 00:59:05 -07:00
#include <asm/schid.h>
[S390] cio: replace subchannel evaluation queue with bitmap Use a bitmap for indicating which subchannels require evaluation instead of allocating memory for each evaluation request. This approach reduces memory consumption during recovery in case of massive evaluation request occurrence and removes the need for memory allocation failure handling. Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2007-04-27 07:01:34 -07:00
struct idset;
void idset_free(struct idset *set);
void idset_clear(struct idset *set);
void idset_fill(struct idset *set);
struct idset *idset_sch_new(void);
void idset_sch_add(struct idset *set, struct subchannel_id id);
void idset_sch_del(struct idset *set, struct subchannel_id id);
int idset_sch_contains(struct idset *set, struct subchannel_id id);
int idset_sch_get_first(struct idset *set, struct subchannel_id *id);
[S390] cio: introduce css_eval_scheduled Use css_eval_scheduled to determine if all scheduled subchannel evaluation is finished. Wait for this value to be 0 in the channel subsystem init function. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-22 13:58:34 -07:00
int idset_is_empty(struct idset *set);
[S390] cio: introduce consistent subchannel scanning Previously, there were multiple subchannel scanning mechanisms which could potentially conflict with each other. Fix this problem by moving blacklist and ccw driver triggered scanning to the existing evaluation method. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-09-22 13:58:38 -07:00
void idset_add_set(struct idset *to, struct idset *from);
[S390] cio: replace subchannel evaluation queue with bitmap Use a bitmap for indicating which subchannels require evaluation instead of allocating memory for each evaluation request. This approach reduces memory consumption during recovery in case of massive evaluation request occurrence and removes the need for memory allocation failure handling. Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2007-04-27 07:01:34 -07:00
#endif /* S390_IDSET_H */
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