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hpsa: reserve some commands for use by driver 

We need to reserve some commands for device rescans,
aborts, and the pass through ioctls, etc. so we cannot
give them all to the scsi mid layer.

This is in preparation for removing cmd_special_alloc and
cmd_special_free so that we can stop queuing commands internally
in the driver so that we can remove the locks thta protect the
queue that we will no longer have.

Reviewed-by: Scott Teel <scott.teel@pmcs.com>
Signed-off-by: Don Brace <don.brace@pmcs.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Stephen Cameron 2015-01-23 16:42:59 -06:00 committed by James Bottomley
parent 8947fd1086
commit d54c5c2487
2 changed files with 7 additions and 2 deletions
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7
drivers/scsi/hpsa.c
View File

@ -4064,11 +4064,14 @@ static int hpsa_register_scsi(struct ctlr_info *h)
sh->max_cmd_len = MAX_COMMAND_SIZE;
sh->max_lun = HPSA_MAX_LUN;
sh->max_id = HPSA_MAX_LUN;
sh->can_queue = h->nr_cmds;
sh->can_queue = h->nr_cmds -
HPSA_CMDS_RESERVED_FOR_ABORTS -
HPSA_CMDS_RESERVED_FOR_DRIVER -
HPSA_MAX_CONCURRENT_PASSTHRUS;
if (h->hba_mode_enabled)
sh->cmd_per_lun = 7;
else
sh->cmd_per_lun = h->nr_cmds;
sh->cmd_per_lun = sh->can_queue;
sh->sg_tablesize = h->maxsgentries;
h->scsi_host = sh;
sh->hostdata[0] = (unsigned long) h;

2
drivers/scsi/hpsa.h
View File

@ -115,6 +115,8 @@ struct ctlr_info {
void __iomem *vaddr;
unsigned long paddr;
int nr_cmds; /* Number of commands allowed on this controller */
#define HPSA_CMDS_RESERVED_FOR_ABORTS 2
#define HPSA_CMDS_RESERVED_FOR_DRIVER 1
struct CfgTable __iomem *cfgtable;
int interrupts_enabled;
int max_commands;