Commit 7aa68e80 authored by FUJITA Tomonori's avatar FUJITA Tomonori Committed by James Bottomley
Browse files

[SCSI] transport_sas: add SAS management protocol support



The sas transport class attaches one bsg device to every SAS object
(host, device, expander, etc). LLDs can define a function to handle
SMP requests via sas_function_template::smp_handler.
Signed-off-by: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent 3ac709c1
......@@ -282,7 +282,7 @@ config SCSI_ISCSI_ATTRS
config SCSI_SAS_ATTRS
tristate "SAS Transport Attributes"
depends on SCSI
depends on SCSI && BLK_DEV_BSG
help
If you wish to export transport-specific information about
each attached SAS device to sysfs, say Y.
......
......@@ -29,6 +29,8 @@
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/blkdev.h>
#include <linux/bsg.h>
#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
......@@ -152,6 +154,76 @@ static struct {
sas_bitfield_name_search(linkspeed, sas_linkspeed_names)
sas_bitfield_name_set(linkspeed, sas_linkspeed_names)
static void sas_smp_request(struct request_queue *q, struct Scsi_Host *shost,
struct sas_rphy *rphy)
{
struct request *req;
int ret;
int (*handler)(struct Scsi_Host *, struct sas_rphy *, struct request *);
while (!blk_queue_plugged(q)) {
req = elv_next_request(q);
if (!req)
break;
blkdev_dequeue_request(req);
spin_unlock_irq(q->queue_lock);
handler = to_sas_internal(shost->transportt)->f->smp_handler;
ret = handler(shost, rphy, req);
spin_lock_irq(q->queue_lock);
req->end_io(req, ret);
}
}
static void sas_host_smp_request(struct request_queue *q)
{
sas_smp_request(q, (struct Scsi_Host *)q->queuedata, NULL);
}
static void sas_non_host_smp_request(struct request_queue *q)
{
struct sas_rphy *rphy = q->queuedata;
sas_smp_request(q, rphy_to_shost(rphy), rphy);
}
static int sas_bsg_initialize(struct Scsi_Host *shost, struct sas_rphy *rphy,
char *name)
{
struct request_queue *q;
int error;
if (!to_sas_internal(shost->transportt)->f->smp_handler) {
printk("%s can't handle SMP requests\n", shost->hostt->name);
return 0;
}
if (rphy)
q = blk_init_queue(sas_non_host_smp_request, NULL);
else
q = blk_init_queue(sas_host_smp_request, NULL);
if (!q)
return -ENOMEM;
error = bsg_register_queue(q, name);
if (error) {
blk_cleanup_queue(q);
return -ENOMEM;
}
if (rphy)
q->queuedata = rphy;
else
q->queuedata = shost;
set_bit(QUEUE_FLAG_BIDI, &q->queue_flags);
return 0;
}
/*
* SAS host attributes
*/
......@@ -161,12 +233,19 @@ static int sas_host_setup(struct transport_container *tc, struct device *dev,
{
struct Scsi_Host *shost = dev_to_shost(dev);
struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
char name[BUS_ID_SIZE];
INIT_LIST_HEAD(&sas_host->rphy_list);
mutex_init(&sas_host->lock);
sas_host->next_target_id = 0;
sas_host->next_expander_id = 0;
sas_host->next_port_id = 0;
snprintf(name, sizeof(name), "sas_host%d", shost->host_no);
if (sas_bsg_initialize(shost, NULL, name))
dev_printk(KERN_ERR, dev, "fail to a bsg device %d\n",
shost->host_no);
return 0;
}
......@@ -1221,6 +1300,9 @@ struct sas_rphy *sas_end_device_alloc(struct sas_port *parent)
sas_rphy_initialize(&rdev->rphy);
transport_setup_device(&rdev->rphy.dev);
if (sas_bsg_initialize(shost, &rdev->rphy, rdev->rphy.dev.bus_id))
printk("fail to a bsg device %s\n", rdev->rphy.dev.bus_id);
return &rdev->rphy;
}
EXPORT_SYMBOL(sas_end_device_alloc);
......@@ -1260,6 +1342,9 @@ struct sas_rphy *sas_expander_alloc(struct sas_port *parent,
sas_rphy_initialize(&rdev->rphy);
transport_setup_device(&rdev->rphy.dev);
if (sas_bsg_initialize(shost, &rdev->rphy, rdev->rphy.dev.bus_id))
printk("fail to a bsg device %s\n", rdev->rphy.dev.bus_id);
return &rdev->rphy;
}
EXPORT_SYMBOL(sas_expander_alloc);
......
......@@ -7,7 +7,7 @@
struct scsi_transport_template;
struct sas_rphy;
struct request;
enum sas_device_type {
SAS_PHY_UNUSED,
......@@ -172,6 +172,7 @@ struct sas_function_template {
int (*phy_reset)(struct sas_phy *, int);
int (*phy_enable)(struct sas_phy *, int);
int (*set_phy_speed)(struct sas_phy *, struct sas_phy_linkrates *);
int (*smp_handler)(struct Scsi_Host *, struct sas_rphy *, struct request *);
};
......
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