Commit 5dc2b89e authored by FUJITA Tomonori's avatar FUJITA Tomonori Committed by James Bottomley
Browse files

[SCSI] add supported_mode and active_mode attributes to the host 



This adds supported_mode and active_mode attributes to
/sys/class/sys_host/hostX/ for specifying the mode that a lld supports
and the currently activated mode. The output format is similar to fc
rport roles:

luce:/sys/class/scsi_host/host0$ cat supported_mode
Initiator
luce:/sys/class/scsi_host/host0$ cat active_mode
Initiator

The mode values uses bitmap since we would support dual-mode llds in
the future like this:

luce:/sys/class/scsi_host/host0$ cat supported_mode
Initiator, Target

The supported_mode attribute looks at a scsi_host_template and the
active_mode attribute looks at a scsi_host. We would add a hook to a
scsi_host_template to change the active_mode attribute
dynamically. But now there is no hook since no lld supports that
feature.

Signed-off-by: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: default avatarMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent 8184fe9b

drivers/scsi/hosts.c

+1 −0
Original line number Diff line number Diff line
@@ -342,6 +342,7 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize) 
	shost->unchecked_isa_dma = sht->unchecked_isa_dma;

	shost->use_clustering = sht->use_clustering;

	shost->ordered_tag = sht->ordered_tag;

	shost->active_mode = sht->supported_mode;



	if (sht->max_host_blocked)

		shost->max_host_blocked = sht->max_host_blocked;

drivers/scsi/scsi_sysfs.c

+42 −0
Original line number Diff line number Diff line
@@ -190,6 +190,46 @@ show_shost_state(struct class_device *class_dev, char *buf) 


static CLASS_DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);



static ssize_t

show_shost_mode(unsigned int mode, char *buf)

{

	ssize_t len = 0;



	if (mode & MODE_INITIATOR)

		len = sprintf(buf, "%s", "Initiator");



	if (mode & MODE_TARGET)

		len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");



	len += sprintf(buf + len, "\n");



	return len;

}



static ssize_t show_shost_supported_mode(struct class_device *class_dev, char *buf)

{

	struct Scsi_Host *shost = class_to_shost(class_dev);



	if (shost->hostt->supported_mode == MODE_UNKNOWN)

		return snprintf(buf, 20, "unknown\n");

	else

		return show_shost_mode(shost->hostt->supported_mode, buf);

}



static CLASS_DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);



static ssize_t show_shost_active_mode(struct class_device *class_dev, char *buf)

{

	struct Scsi_Host *shost = class_to_shost(class_dev);



	if (shost->active_mode == MODE_UNKNOWN)

		return snprintf(buf, 20, "unknown\n");

	else

		return show_shost_mode(shost->active_mode, buf);

}



static CLASS_DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);



shost_rd_attr(unique_id, "%u\n");

shost_rd_attr(host_busy, "%hu\n");

shost_rd_attr(cmd_per_lun, "%hd\n");
@@ -208,6 +248,8 @@ static struct class_device_attribute *scsi_sysfs_shost_attrs[] = { 
	&class_device_attr_proc_name,

	&class_device_attr_scan,

	&class_device_attr_state,

	&class_device_attr_supported_mode,

	&class_device_attr_active_mode,

	NULL

};

include/scsi/scsi_host.h

+9 −0
Original line number Diff line number Diff line
@@ -32,6 +32,9 @@ struct blk_queue_tags; 
#define SG_NONE 0

#define SG_ALL 0xff



#define MODE_UNKNOWN 0x00

#define MODE_INITIATOR 0x01

#define MODE_TARGET 0x02



#define DISABLE_CLUSTERING 0

#define ENABLE_CLUSTERING 1
@@ -404,6 +407,11 @@ struct scsi_host_template { 
	 */

	unsigned char present;



	/*

	 * This specifies the mode that a LLD supports.

	 */

	unsigned supported_mode:2;



	/*

	 * true if this host adapter uses unchecked DMA onto an ISA bus.

	 */
@@ -574,6 +582,7 @@ struct Scsi_Host { 
	 */

	unsigned long cmd_serial_number, cmd_pid; 

	

	unsigned active_mode:2;

	unsigned unchecked_isa_dma:1;

	unsigned use_clustering:1;

	unsigned use_blk_tcq:1;

CRA Git | Maintained and supported by SUSTech CRA and CCSE