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[SCSI] modify change_queue_depth to take in reason why it is being called

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This patch modifies scsi_host_template->change_queue_depth so that
it takes an argument indicating why it is being called. This will be
used so that if a LLD needs to do some extra processing when
handling queue fulls or later ramp ups, it can do so.

This is a simple port of the drivers setting a change_queue_depth
callback. In the patch I just have these LLDs adjust the queue depth
if the user was requesting it.

Signed-off-by: Mike Christie <[email protected]>

[Vasu.Dev: v2
	Also converted pmcraid_change_queue_depth and then verified
all modules compile  using "make allmodconfig" for any new build
warnings on X86_64.

	Updated original description after combing two original
patches from Mike to make this patch git bisectable.]
Signed-off-by: Vasu Dev <[email protected]>
[jejb: fixed up 53c700]
Signed-off-by: James Bottomley <[email protected]>
This commit is contained in:
Mike Christie 2009-10-15 17:46:39 -07:00 • committed by James Bottomley
commit e881a172da
27 changed files with 119 additions and 32 deletions
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2
include/scsi/libfc.h
View file

@ -919,7 +919,7 @@ int fc_slave_alloc(struct scsi_device *sdev);
/*
* Adjust the queue depth.
*/
int fc_change_queue_depth(struct scsi_device *sdev, int qdepth);
int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason);
/*
* Change the tag type.

3
include/scsi/libiscsi.h
View file

@ -333,7 +333,8 @@ struct iscsi_host {
/*
* scsi host template
*/
extern int iscsi_change_queue_depth(struct scsi_device *sdev, int depth);
extern int iscsi_change_queue_depth(struct scsi_device *sdev, int depth,
int reason);
extern int iscsi_eh_abort(struct scsi_cmnd *sc);
extern int iscsi_eh_target_reset(struct scsi_cmnd *sc);
extern int iscsi_eh_device_reset(struct scsi_cmnd *sc);

3
include/scsi/libsas.h
View file

@ -634,7 +634,8 @@ extern int sas_target_alloc(struct scsi_target *);
extern int sas_slave_alloc(struct scsi_device *);
extern int sas_slave_configure(struct scsi_device *);
extern void sas_slave_destroy(struct scsi_device *);
extern int sas_change_queue_depth(struct scsi_device *, int new_depth);
extern int sas_change_queue_depth(struct scsi_device *, int new_depth,
int reason);
extern int sas_change_queue_type(struct scsi_device *, int qt);
extern int sas_bios_param(struct scsi_device *,
struct block_device *,

8
include/scsi/scsi_host.h
View file

@ -43,6 +43,12 @@ struct blk_queue_tags;
#define DISABLE_CLUSTERING 0
#define ENABLE_CLUSTERING 1
enum {
SCSI_QDEPTH_DEFAULT, /* default requested change, e.g. from sysfs */
SCSI_QDEPTH_QFULL, /* scsi-ml requested due to queue full */
SCSI_QDEPTH_RAMP_UP, /* scsi-ml requested due to threshhold event */
};
struct scsi_host_template {
struct module *module;
const char *name;
@ -294,7 +300,7 @@ struct scsi_host_template {
*
* Status: OPTIONAL
*/
int (* change_queue_depth)(struct scsi_device *, int);
int (* change_queue_depth)(struct scsi_device *, int, int);
/*
* Fill in this function to allow the changing of tag types