Commit d54c5c24 authored by Stephen Cameron's avatar Stephen Cameron Committed by James Bottomley
Browse files

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: default avatarScott Teel <scott.teel@pmcs.com>
Signed-off-by: default avatarDon Brace <don.brace@pmcs.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 8947fd10

drivers/scsi/hpsa.c

+5 −2
Original line number Diff line number Diff line
@@ -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;

drivers/scsi/hpsa.h

+2 −0
Original line number Diff line number Diff line
@@ -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;

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