linux/drivers/scsi/scsi_transport_sas.c
Tejun Heo 9934c8c045 block: implement and enforce request peek/start/fetch
Till now block layer allowed two separate modes of request execution.
A request is always acquired from the request queue via
elv_next_request().  After that, drivers are free to either dequeue it
or process it without dequeueing.  Dequeue allows elv_next_request()
to return the next request so that multiple requests can be in flight.

Executing requests without dequeueing has its merits mostly in
allowing drivers for simpler devices which can't do sg to deal with
segments only without considering request boundary.  However, the
benefit this brings is dubious and declining while the cost of the API
ambiguity is increasing.  Segment based drivers are usually for very
old or limited devices and as converting to dequeueing model isn't
difficult, it doesn't justify the API overhead it puts on block layer
and its more modern users.

Previous patches converted all block low level drivers to dequeueing
model.  This patch completes the API transition by...

* renaming elv_next_request() to blk_peek_request()

* renaming blkdev_dequeue_request() to blk_start_request()

* adding blk_fetch_request() which is combination of peek and start

* disallowing completion of queued (not started) requests

* applying new API to all LLDs

Renamings are for consistency and to break out of tree code so that
it's apparent that out of tree drivers need updating.

[ Impact: block request issue API cleanup, no functional change ]

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Mike Miller <mike.miller@hp.com>
Cc: unsik Kim <donari75@gmail.com>
Cc: Paul Clements <paul.clements@steeleye.com>
Cc: Tim Waugh <tim@cyberelk.net>
Cc: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Laurent Vivier <Laurent@lvivier.info>
Cc: Jeff Garzik <jgarzik@pobox.com>
Cc: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Adrian McMenamin <adrian@mcmen.demon.co.uk>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Borislav Petkov <petkovbb@googlemail.com>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Alex Dubov <oakad@yahoo.com>
Cc: Pierre Ossman <drzeus@drzeus.cx>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Markus Lidel <Markus.Lidel@shadowconnect.com>
Cc: Stefan Weinhuber <wein@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-05-11 09:52:18 +02:00

1830 lines
49 KiB
C

/*
* Copyright (C) 2005-2006 Dell Inc.
* Released under GPL v2.
*
* Serial Attached SCSI (SAS) transport class.
*
* The SAS transport class contains common code to deal with SAS HBAs,
* an aproximated representation of SAS topologies in the driver model,
* and various sysfs attributes to expose these topologies and management
* interfaces to userspace.
*
* In addition to the basic SCSI core objects this transport class
* introduces two additional intermediate objects: The SAS PHY
* as represented by struct sas_phy defines an "outgoing" PHY on
* a SAS HBA or Expander, and the SAS remote PHY represented by
* struct sas_rphy defines an "incoming" PHY on a SAS Expander or
* end device. Note that this is purely a software concept, the
* underlying hardware for a PHY and a remote PHY is the exactly
* the same.
*
* There is no concept of a SAS port in this code, users can see
* what PHYs form a wide port based on the port_identifier attribute,
* which is the same for all PHYs in a port.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/jiffies.h>
#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>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_sas.h>
#include "scsi_sas_internal.h"
struct sas_host_attrs {
struct list_head rphy_list;
struct mutex lock;
struct request_queue *q;
u32 next_target_id;
u32 next_expander_id;
int next_port_id;
};
#define to_sas_host_attrs(host) ((struct sas_host_attrs *)(host)->shost_data)
/*
* Hack to allow attributes of the same name in different objects.
*/
#define SAS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
struct device_attribute dev_attr_##_prefix##_##_name = \
__ATTR(_name,_mode,_show,_store)
/*
* Pretty printing helpers
*/
#define sas_bitfield_name_match(title, table) \
static ssize_t \
get_sas_##title##_names(u32 table_key, char *buf) \
{ \
char *prefix = ""; \
ssize_t len = 0; \
int i; \
\
for (i = 0; i < ARRAY_SIZE(table); i++) { \
if (table[i].value & table_key) { \
len += sprintf(buf + len, "%s%s", \
prefix, table[i].name); \
prefix = ", "; \
} \
} \
len += sprintf(buf + len, "\n"); \
return len; \
}
#define sas_bitfield_name_set(title, table) \
static ssize_t \
set_sas_##title##_names(u32 *table_key, const char *buf) \
{ \
ssize_t len = 0; \
int i; \
\
for (i = 0; i < ARRAY_SIZE(table); i++) { \
len = strlen(table[i].name); \
if (strncmp(buf, table[i].name, len) == 0 && \
(buf[len] == '\n' || buf[len] == '\0')) { \
*table_key = table[i].value; \
return 0; \
} \
} \
return -EINVAL; \
}
#define sas_bitfield_name_search(title, table) \
static ssize_t \
get_sas_##title##_names(u32 table_key, char *buf) \
{ \
ssize_t len = 0; \
int i; \
\
for (i = 0; i < ARRAY_SIZE(table); i++) { \
if (table[i].value == table_key) { \
len += sprintf(buf + len, "%s", \
table[i].name); \
break; \
} \
} \
len += sprintf(buf + len, "\n"); \
return len; \
}
static struct {
u32 value;
char *name;
} sas_device_type_names[] = {
{ SAS_PHY_UNUSED, "unused" },
{ SAS_END_DEVICE, "end device" },
{ SAS_EDGE_EXPANDER_DEVICE, "edge expander" },
{ SAS_FANOUT_EXPANDER_DEVICE, "fanout expander" },
};
sas_bitfield_name_search(device_type, sas_device_type_names)
static struct {
u32 value;
char *name;
} sas_protocol_names[] = {
{ SAS_PROTOCOL_SATA, "sata" },
{ SAS_PROTOCOL_SMP, "smp" },
{ SAS_PROTOCOL_STP, "stp" },
{ SAS_PROTOCOL_SSP, "ssp" },
};
sas_bitfield_name_match(protocol, sas_protocol_names)
static struct {
u32 value;
char *name;
} sas_linkspeed_names[] = {
{ SAS_LINK_RATE_UNKNOWN, "Unknown" },
{ SAS_PHY_DISABLED, "Phy disabled" },
{ SAS_LINK_RATE_FAILED, "Link Rate failed" },
{ SAS_SATA_SPINUP_HOLD, "Spin-up hold" },
{ SAS_LINK_RATE_1_5_GBPS, "1.5 Gbit" },
{ SAS_LINK_RATE_3_0_GBPS, "3.0 Gbit" },
{ SAS_LINK_RATE_6_0_GBPS, "6.0 Gbit" },
};
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 = blk_fetch_request(q);
if (!req)
break;
spin_unlock_irq(q->queue_lock);
handler = to_sas_internal(shost->transportt)->f->smp_handler;
ret = handler(shost, rphy, req);
req->errors = ret;
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 void sas_host_release(struct device *dev)
{
struct Scsi_Host *shost = dev_to_shost(dev);
struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
struct request_queue *q = sas_host->q;
if (q)
blk_cleanup_queue(q);
}
static int sas_bsg_initialize(struct Scsi_Host *shost, struct sas_rphy *rphy)
{
struct request_queue *q;
int error;
struct device *dev;
char namebuf[20];
const char *name;
void (*release)(struct device *);
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);
dev = &rphy->dev;
name = dev_name(dev);
release = NULL;
} else {
q = blk_init_queue(sas_host_smp_request, NULL);
dev = &shost->shost_gendev;
snprintf(namebuf, sizeof(namebuf),
"sas_host%d", shost->host_no);
name = namebuf;
release = sas_host_release;
}
if (!q)
return -ENOMEM;
error = bsg_register_queue(q, dev, name, release);
if (error) {
blk_cleanup_queue(q);
return -ENOMEM;
}
if (rphy)
rphy->q = q;
else
to_sas_host_attrs(shost)->q = q;
if (rphy)
q->queuedata = rphy;
else
q->queuedata = shost;
queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
return 0;
}
static void sas_bsg_remove(struct Scsi_Host *shost, struct sas_rphy *rphy)
{
struct request_queue *q;
if (rphy)
q = rphy->q;
else
q = to_sas_host_attrs(shost)->q;
if (!q)
return;
bsg_unregister_queue(q);
}
/*
* SAS host attributes
*/
static int sas_host_setup(struct transport_container *tc, struct device *dev,
struct device *cdev)
{
struct Scsi_Host *shost = dev_to_shost(dev);
struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
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;
if (sas_bsg_initialize(shost, NULL))
dev_printk(KERN_ERR, dev, "fail to a bsg device %d\n",
shost->host_no);
return 0;
}
static int sas_host_remove(struct transport_container *tc, struct device *dev,
struct device *cdev)
{
struct Scsi_Host *shost = dev_to_shost(dev);
sas_bsg_remove(shost, NULL);
return 0;
}
static DECLARE_TRANSPORT_CLASS(sas_host_class,
"sas_host", sas_host_setup, sas_host_remove, NULL);
static int sas_host_match(struct attribute_container *cont,
struct device *dev)
{
struct Scsi_Host *shost;
struct sas_internal *i;
if (!scsi_is_host_device(dev))
return 0;
shost = dev_to_shost(dev);
if (!shost->transportt)
return 0;
if (shost->transportt->host_attrs.ac.class !=
&sas_host_class.class)
return 0;
i = to_sas_internal(shost->transportt);
return &i->t.host_attrs.ac == cont;
}
static int do_sas_phy_delete(struct device *dev, void *data)
{
int pass = (int)(unsigned long)data;
if (pass == 0 && scsi_is_sas_port(dev))
sas_port_delete(dev_to_sas_port(dev));
else if (pass == 1 && scsi_is_sas_phy(dev))
sas_phy_delete(dev_to_phy(dev));
return 0;
}
/**
* sas_remove_children - tear down a devices SAS data structures
* @dev: device belonging to the sas object
*
* Removes all SAS PHYs and remote PHYs for a given object
*/
void sas_remove_children(struct device *dev)
{
device_for_each_child(dev, (void *)0, do_sas_phy_delete);
device_for_each_child(dev, (void *)1, do_sas_phy_delete);
}
EXPORT_SYMBOL(sas_remove_children);
/**
* sas_remove_host - tear down a Scsi_Host's SAS data structures
* @shost: Scsi Host that is torn down
*
* Removes all SAS PHYs and remote PHYs for a given Scsi_Host.
* Must be called just before scsi_remove_host for SAS HBAs.
*/
void sas_remove_host(struct Scsi_Host *shost)
{
sas_remove_children(&shost->shost_gendev);
}
EXPORT_SYMBOL(sas_remove_host);
/*
* SAS Phy attributes
*/
#define sas_phy_show_simple(field, name, format_string, cast) \
static ssize_t \
show_sas_phy_##name(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct sas_phy *phy = transport_class_to_phy(dev); \
\
return snprintf(buf, 20, format_string, cast phy->field); \
}
#define sas_phy_simple_attr(field, name, format_string, type) \
sas_phy_show_simple(field, name, format_string, (type)) \
static DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
#define sas_phy_show_protocol(field, name) \
static ssize_t \
show_sas_phy_##name(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct sas_phy *phy = transport_class_to_phy(dev); \
\
if (!phy->field) \
return snprintf(buf, 20, "none\n"); \
return get_sas_protocol_names(phy->field, buf); \
}
#define sas_phy_protocol_attr(field, name) \
sas_phy_show_protocol(field, name) \
static DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
#define sas_phy_show_linkspeed(field) \
static ssize_t \
show_sas_phy_##field(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct sas_phy *phy = transport_class_to_phy(dev); \
\
return get_sas_linkspeed_names(phy->field, buf); \
}
/* Fudge to tell if we're minimum or maximum */
#define sas_phy_store_linkspeed(field) \
static ssize_t \
store_sas_phy_##field(struct device *dev, \
struct device_attribute *attr, \
const char *buf, size_t count) \
{ \
struct sas_phy *phy = transport_class_to_phy(dev); \
struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); \
struct sas_internal *i = to_sas_internal(shost->transportt); \
u32 value; \
struct sas_phy_linkrates rates = {0}; \
int error; \
\
error = set_sas_linkspeed_names(&value, buf); \
if (error) \
return error; \
rates.field = value; \
error = i->f->set_phy_speed(phy, &rates); \
\
return error ? error : count; \
}
#define sas_phy_linkspeed_rw_attr(field) \
sas_phy_show_linkspeed(field) \
sas_phy_store_linkspeed(field) \
static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, \
store_sas_phy_##field)
#define sas_phy_linkspeed_attr(field) \
sas_phy_show_linkspeed(field) \
static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
#define sas_phy_show_linkerror(field) \
static ssize_t \
show_sas_phy_##field(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct sas_phy *phy = transport_class_to_phy(dev); \
struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); \
struct sas_internal *i = to_sas_internal(shost->transportt); \
int error; \
\
error = i->f->get_linkerrors ? i->f->get_linkerrors(phy) : 0; \
if (error) \
return error; \
return snprintf(buf, 20, "%u\n", phy->field); \
}
#define sas_phy_linkerror_attr(field) \
sas_phy_show_linkerror(field) \
static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
static ssize_t
show_sas_device_type(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sas_phy *phy = transport_class_to_phy(dev);
if (!phy->identify.device_type)
return snprintf(buf, 20, "none\n");
return get_sas_device_type_names(phy->identify.device_type, buf);
}
static DEVICE_ATTR(device_type, S_IRUGO, show_sas_device_type, NULL);
static ssize_t do_sas_phy_enable(struct device *dev,
size_t count, int enable)
{
struct sas_phy *phy = transport_class_to_phy(dev);
struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
struct sas_internal *i = to_sas_internal(shost->transportt);
int error;
error = i->f->phy_enable(phy, enable);
if (error)
return error;
phy->enabled = enable;
return count;
};
static ssize_t
store_sas_phy_enable(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
if (count < 1)
return -EINVAL;
switch (buf[0]) {
case '0':
do_sas_phy_enable(dev, count, 0);
break;
case '1':
do_sas_phy_enable(dev, count, 1);
break;
default:
return -EINVAL;
}
return count;
}
static ssize_t
show_sas_phy_enable(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct sas_phy *phy = transport_class_to_phy(dev);
return snprintf(buf, 20, "%d", phy->enabled);
}
static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, show_sas_phy_enable,
store_sas_phy_enable);
static ssize_t
do_sas_phy_reset(struct device *dev, size_t count, int hard_reset)
{
struct sas_phy *phy = transport_class_to_phy(dev);
struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
struct sas_internal *i = to_sas_internal(shost->transportt);
int error;
error = i->f->phy_reset(phy, hard_reset);
if (error)
return error;
return count;
};
static ssize_t
store_sas_link_reset(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
return do_sas_phy_reset(dev, count, 0);
}
static DEVICE_ATTR(link_reset, S_IWUSR, NULL, store_sas_link_reset);
static ssize_t
store_sas_hard_reset(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
return do_sas_phy_reset(dev, count, 1);
}
static DEVICE_ATTR(hard_reset, S_IWUSR, NULL, store_sas_hard_reset);
sas_phy_protocol_attr(identify.initiator_port_protocols,
initiator_port_protocols);
sas_phy_protocol_attr(identify.target_port_protocols,
target_port_protocols);
sas_phy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
unsigned long long);
sas_phy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
//sas_phy_simple_attr(port_identifier, port_identifier, "%d\n", int);
sas_phy_linkspeed_attr(negotiated_linkrate);
sas_phy_linkspeed_attr(minimum_linkrate_hw);
sas_phy_linkspeed_rw_attr(minimum_linkrate);
sas_phy_linkspeed_attr(maximum_linkrate_hw);
sas_phy_linkspeed_rw_attr(maximum_linkrate);
sas_phy_linkerror_attr(invalid_dword_count);
sas_phy_linkerror_attr(running_disparity_error_count);
sas_phy_linkerror_attr(loss_of_dword_sync_count);
sas_phy_linkerror_attr(phy_reset_problem_count);
static DECLARE_TRANSPORT_CLASS(sas_phy_class,
"sas_phy", NULL, NULL, NULL);
static int sas_phy_match(struct attribute_container *cont, struct device *dev)
{
struct Scsi_Host *shost;
struct sas_internal *i;
if (!scsi_is_sas_phy(dev))
return 0;
shost = dev_to_shost(dev->parent);
if (!shost->transportt)
return 0;
if (shost->transportt->host_attrs.ac.class !=
&sas_host_class.class)
return 0;
i = to_sas_internal(shost->transportt);
return &i->phy_attr_cont.ac == cont;
}
static void sas_phy_release(struct device *dev)
{
struct sas_phy *phy = dev_to_phy(dev);
put_device(dev->parent);
kfree(phy);
}
/**
* sas_phy_alloc - allocates and initialize a SAS PHY structure
* @parent: Parent device
* @number: Phy index
*
* Allocates an SAS PHY structure. It will be added in the device tree
* below the device specified by @parent, which has to be either a Scsi_Host
* or sas_rphy.
*
* Returns:
* SAS PHY allocated or %NULL if the allocation failed.
*/
struct sas_phy *sas_phy_alloc(struct device *parent, int number)
{
struct Scsi_Host *shost = dev_to_shost(parent);
struct sas_phy *phy;
phy = kzalloc(sizeof(*phy), GFP_KERNEL);
if (!phy)
return NULL;
phy->number = number;
phy->enabled = 1;
device_initialize(&phy->dev);
phy->dev.parent = get_device(parent);
phy->dev.release = sas_phy_release;
INIT_LIST_HEAD(&phy->port_siblings);
if (scsi_is_sas_expander_device(parent)) {
struct sas_rphy *rphy = dev_to_rphy(parent);
dev_set_name(&phy->dev, "phy-%d:%d:%d", shost->host_no,
rphy->scsi_target_id, number);
} else
dev_set_name(&phy->dev, "phy-%d:%d", shost->host_no, number);
transport_setup_device(&phy->dev);
return phy;
}
EXPORT_SYMBOL(sas_phy_alloc);
/**
* sas_phy_add - add a SAS PHY to the device hierarchy
* @phy: The PHY to be added
*
* Publishes a SAS PHY to the rest of the system.
*/
int sas_phy_add(struct sas_phy *phy)
{
int error;
error = device_add(&phy->dev);
if (!error) {
transport_add_device(&phy->dev);
transport_configure_device(&phy->dev);
}
return error;
}
EXPORT_SYMBOL(sas_phy_add);
/**
* sas_phy_free - free a SAS PHY
* @phy: SAS PHY to free
*
* Frees the specified SAS PHY.
*
* Note:
* This function must only be called on a PHY that has not
* sucessfully been added using sas_phy_add().
*/
void sas_phy_free(struct sas_phy *phy)
{
transport_destroy_device(&phy->dev);
put_device(&phy->dev);
}
EXPORT_SYMBOL(sas_phy_free);
/**
* sas_phy_delete - remove SAS PHY
* @phy: SAS PHY to remove
*
* Removes the specified SAS PHY. If the SAS PHY has an
* associated remote PHY it is removed before.
*/
void
sas_phy_delete(struct sas_phy *phy)
{
struct device *dev = &phy->dev;
/* this happens if the phy is still part of a port when deleted */
BUG_ON(!list_empty(&phy->port_siblings));
transport_remove_device(dev);
device_del(dev);
transport_destroy_device(dev);
put_device(dev);
}
EXPORT_SYMBOL(sas_phy_delete);
/**
* scsi_is_sas_phy - check if a struct device represents a SAS PHY
* @dev: device to check
*
* Returns:
* %1 if the device represents a SAS PHY, %0 else
*/
int scsi_is_sas_phy(const struct device *dev)
{
return dev->release == sas_phy_release;
}
EXPORT_SYMBOL(scsi_is_sas_phy);
/*
* SAS Port attributes
*/
#define sas_port_show_simple(field, name, format_string, cast) \
static ssize_t \
show_sas_port_##name(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct sas_port *port = transport_class_to_sas_port(dev); \
\
return snprintf(buf, 20, format_string, cast port->field); \
}
#define sas_port_simple_attr(field, name, format_string, type) \
sas_port_show_simple(field, name, format_string, (type)) \
static DEVICE_ATTR(name, S_IRUGO, show_sas_port_##name, NULL)
sas_port_simple_attr(num_phys, num_phys, "%d\n", int);
static DECLARE_TRANSPORT_CLASS(sas_port_class,
"sas_port", NULL, NULL, NULL);
static int sas_port_match(struct attribute_container *cont, struct device *dev)
{
struct Scsi_Host *shost;
struct sas_internal *i;
if (!scsi_is_sas_port(dev))
return 0;
shost = dev_to_shost(dev->parent);
if (!shost->transportt)
return 0;
if (shost->transportt->host_attrs.ac.class !=
&sas_host_class.class)
return 0;
i = to_sas_internal(shost->transportt);
return &i->port_attr_cont.ac == cont;
}
static void sas_port_release(struct device *dev)
{
struct sas_port *port = dev_to_sas_port(dev);
BUG_ON(!list_empty(&port->phy_list));
put_device(dev->parent);
kfree(port);
}
static void sas_port_create_link(struct sas_port *port,
struct sas_phy *phy)
{
int res;
res = sysfs_create_link(&port->dev.kobj, &phy->dev.kobj,
dev_name(&phy->dev));
if (res)
goto err;
res = sysfs_create_link(&phy->dev.kobj, &port->dev.kobj, "port");
if (res)
goto err;
return;
err:
printk(KERN_ERR "%s: Cannot create port links, err=%d\n",
__func__, res);
}
static void sas_port_delete_link(struct sas_port *port,
struct sas_phy *phy)
{
sysfs_remove_link(&port->dev.kobj, dev_name(&phy->dev));
sysfs_remove_link(&phy->dev.kobj, "port");
}
/** sas_port_alloc - allocate and initialize a SAS port structure
*
* @parent: parent device
* @port_id: port number
*
* Allocates a SAS port structure. It will be added to the device tree
* below the device specified by @parent which must be either a Scsi_Host
* or a sas_expander_device.
*
* Returns %NULL on error
*/
struct sas_port *sas_port_alloc(struct device *parent, int port_id)
{
struct Scsi_Host *shost = dev_to_shost(parent);
struct sas_port *port;
port = kzalloc(sizeof(*port), GFP_KERNEL);
if (!port)
return NULL;
port->port_identifier = port_id;
device_initialize(&port->dev);
port->dev.parent = get_device(parent);
port->dev.release = sas_port_release;
mutex_init(&port->phy_list_mutex);
INIT_LIST_HEAD(&port->phy_list);
if (scsi_is_sas_expander_device(parent)) {
struct sas_rphy *rphy = dev_to_rphy(parent);
dev_set_name(&port->dev, "port-%d:%d:%d", shost->host_no,
rphy->scsi_target_id, port->port_identifier);
} else
dev_set_name(&port->dev, "port-%d:%d", shost->host_no,
port->port_identifier);
transport_setup_device(&port->dev);
return port;
}
EXPORT_SYMBOL(sas_port_alloc);
/** sas_port_alloc_num - allocate and initialize a SAS port structure
*
* @parent: parent device
*
* Allocates a SAS port structure and a number to go with it. This
* interface is really for adapters where the port number has no
* meansing, so the sas class should manage them. It will be added to
* the device tree below the device specified by @parent which must be
* either a Scsi_Host or a sas_expander_device.
*
* Returns %NULL on error
*/
struct sas_port *sas_port_alloc_num(struct device *parent)
{
int index;
struct Scsi_Host *shost = dev_to_shost(parent);
struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
/* FIXME: use idr for this eventually */
mutex_lock(&sas_host->lock);
if (scsi_is_sas_expander_device(parent)) {
struct sas_rphy *rphy = dev_to_rphy(parent);
struct sas_expander_device *exp = rphy_to_expander_device(rphy);
index = exp->next_port_id++;
} else
index = sas_host->next_port_id++;
mutex_unlock(&sas_host->lock);
return sas_port_alloc(parent, index);
}
EXPORT_SYMBOL(sas_port_alloc_num);
/**
* sas_port_add - add a SAS port to the device hierarchy
* @port: port to be added
*
* publishes a port to the rest of the system
*/
int sas_port_add(struct sas_port *port)
{
int error;
/* No phys should be added until this is made visible */
BUG_ON(!list_empty(&port->phy_list));
error = device_add(&port->dev);
if (error)
return error;
transport_add_device(&port->dev);
transport_configure_device(&port->dev);
return 0;
}
EXPORT_SYMBOL(sas_port_add);
/**
* sas_port_free - free a SAS PORT
* @port: SAS PORT to free
*
* Frees the specified SAS PORT.
*
* Note:
* This function must only be called on a PORT that has not
* sucessfully been added using sas_port_add().
*/
void sas_port_free(struct sas_port *port)
{
transport_destroy_device(&port->dev);
put_device(&port->dev);
}
EXPORT_SYMBOL(sas_port_free);
/**
* sas_port_delete - remove SAS PORT
* @port: SAS PORT to remove
*
* Removes the specified SAS PORT. If the SAS PORT has an
* associated phys, unlink them from the port as well.
*/
void sas_port_delete(struct sas_port *port)
{
struct device *dev = &port->dev;
struct sas_phy *phy, *tmp_phy;
if (port->rphy) {
sas_rphy_delete(port->rphy);
port->rphy = NULL;
}
mutex_lock(&port->phy_list_mutex);
list_for_each_entry_safe(phy, tmp_phy, &port->phy_list,
port_siblings) {
sas_port_delete_link(port, phy);
list_del_init(&phy->port_siblings);
}
mutex_unlock(&port->phy_list_mutex);
if (port->is_backlink) {
struct device *parent = port->dev.parent;
sysfs_remove_link(&port->dev.kobj, dev_name(parent));
port->is_backlink = 0;
}
transport_remove_device(dev);
device_del(dev);
transport_destroy_device(dev);
put_device(dev);
}
EXPORT_SYMBOL(sas_port_delete);
/**
* scsi_is_sas_port - check if a struct device represents a SAS port
* @dev: device to check
*
* Returns:
* %1 if the device represents a SAS Port, %0 else
*/
int scsi_is_sas_port(const struct device *dev)
{
return dev->release == sas_port_release;
}
EXPORT_SYMBOL(scsi_is_sas_port);
/**
* sas_port_add_phy - add another phy to a port to form a wide port
* @port: port to add the phy to
* @phy: phy to add
*
* When a port is initially created, it is empty (has no phys). All
* ports must have at least one phy to operated, and all wide ports
* must have at least two. The current code makes no difference
* between ports and wide ports, but the only object that can be
* connected to a remote device is a port, so ports must be formed on
* all devices with phys if they're connected to anything.
*/
void sas_port_add_phy(struct sas_port *port, struct sas_phy *phy)
{
mutex_lock(&port->phy_list_mutex);
if (unlikely(!list_empty(&phy->port_siblings))) {
/* make sure we're already on this port */
struct sas_phy *tmp;
list_for_each_entry(tmp, &port->phy_list, port_siblings)
if (tmp == phy)
break;
/* If this trips, you added a phy that was already
* part of a different port */
if (unlikely(tmp != phy)) {
dev_printk(KERN_ERR, &port->dev, "trying to add phy %s fails: it's already part of another port\n",
dev_name(&phy->dev));
BUG();
}
} else {
sas_port_create_link(port, phy);
list_add_tail(&phy->port_siblings, &port->phy_list);
port->num_phys++;
}
mutex_unlock(&port->phy_list_mutex);
}
EXPORT_SYMBOL(sas_port_add_phy);
/**
* sas_port_delete_phy - remove a phy from a port or wide port
* @port: port to remove the phy from
* @phy: phy to remove
*
* This operation is used for tearing down ports again. It must be
* done to every port or wide port before calling sas_port_delete.
*/
void sas_port_delete_phy(struct sas_port *port, struct sas_phy *phy)
{
mutex_lock(&port->phy_list_mutex);
sas_port_delete_link(port, phy);
list_del_init(&phy->port_siblings);
port->num_phys--;
mutex_unlock(&port->phy_list_mutex);
}
EXPORT_SYMBOL(sas_port_delete_phy);
void sas_port_mark_backlink(struct sas_port *port)
{
int res;
struct device *parent = port->dev.parent->parent->parent;
if (port->is_backlink)
return;
port->is_backlink = 1;
res = sysfs_create_link(&port->dev.kobj, &parent->kobj,
dev_name(parent));
if (res)
goto err;
return;
err:
printk(KERN_ERR "%s: Cannot create port backlink, err=%d\n",
__func__, res);
}
EXPORT_SYMBOL(sas_port_mark_backlink);
/*
* SAS remote PHY attributes.
*/
#define sas_rphy_show_simple(field, name, format_string, cast) \
static ssize_t \
show_sas_rphy_##name(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct sas_rphy *rphy = transport_class_to_rphy(dev); \
\
return snprintf(buf, 20, format_string, cast rphy->field); \
}
#define sas_rphy_simple_attr(field, name, format_string, type) \
sas_rphy_show_simple(field, name, format_string, (type)) \
static SAS_DEVICE_ATTR(rphy, name, S_IRUGO, \
show_sas_rphy_##name, NULL)
#define sas_rphy_show_protocol(field, name) \
static ssize_t \
show_sas_rphy_##name(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct sas_rphy *rphy = transport_class_to_rphy(dev); \
\
if (!rphy->field) \
return snprintf(buf, 20, "none\n"); \
return get_sas_protocol_names(rphy->field, buf); \
}
#define sas_rphy_protocol_attr(field, name) \
sas_rphy_show_protocol(field, name) \
static SAS_DEVICE_ATTR(rphy, name, S_IRUGO, \
show_sas_rphy_##name, NULL)
static ssize_t
show_sas_rphy_device_type(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sas_rphy *rphy = transport_class_to_rphy(dev);
if (!rphy->identify.device_type)
return snprintf(buf, 20, "none\n");
return get_sas_device_type_names(
rphy->identify.device_type, buf);
}
static SAS_DEVICE_ATTR(rphy, device_type, S_IRUGO,
show_sas_rphy_device_type, NULL);
static ssize_t
show_sas_rphy_enclosure_identifier(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sas_rphy *rphy = transport_class_to_rphy(dev);
struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
struct sas_internal *i = to_sas_internal(shost->transportt);
u64 identifier;
int error;
/*
* Only devices behind an expander are supported, because the
* enclosure identifier is a SMP feature.
*/
if (scsi_is_sas_phy_local(phy))
return -EINVAL;
error = i->f->get_enclosure_identifier(rphy, &identifier);
if (error)
return error;
return sprintf(buf, "0x%llx\n", (unsigned long long)identifier);
}
static SAS_DEVICE_ATTR(rphy, enclosure_identifier, S_IRUGO,
show_sas_rphy_enclosure_identifier, NULL);
static ssize_t
show_sas_rphy_bay_identifier(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sas_rphy *rphy = transport_class_to_rphy(dev);
struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
struct sas_internal *i = to_sas_internal(shost->transportt);
int val;
if (scsi_is_sas_phy_local(phy))
return -EINVAL;
val = i->f->get_bay_identifier(rphy);
if (val < 0)
return val;
return sprintf(buf, "%d\n", val);
}
static SAS_DEVICE_ATTR(rphy, bay_identifier, S_IRUGO,
show_sas_rphy_bay_identifier, NULL);
sas_rphy_protocol_attr(identify.initiator_port_protocols,
initiator_port_protocols);
sas_rphy_protocol_attr(identify.target_port_protocols, target_port_protocols);
sas_rphy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
unsigned long long);
sas_rphy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
/* only need 8 bytes of data plus header (4 or 8) */
#define BUF_SIZE 64
int sas_read_port_mode_page(struct scsi_device *sdev)
{
char *buffer = kzalloc(BUF_SIZE, GFP_KERNEL), *msdata;
struct sas_rphy *rphy = target_to_rphy(sdev->sdev_target);
struct sas_end_device *rdev;
struct scsi_mode_data mode_data;
int res, error;
BUG_ON(rphy->identify.device_type != SAS_END_DEVICE);
rdev = rphy_to_end_device(rphy);
if (!buffer)
return -ENOMEM;
res = scsi_mode_sense(sdev, 1, 0x19, buffer, BUF_SIZE, 30*HZ, 3,
&mode_data, NULL);
error = -EINVAL;
if (!scsi_status_is_good(res))
goto out;
msdata = buffer + mode_data.header_length +
mode_data.block_descriptor_length;
if (msdata - buffer > BUF_SIZE - 8)
goto out;
error = 0;
rdev->ready_led_meaning = msdata[2] & 0x10 ? 1 : 0;
rdev->I_T_nexus_loss_timeout = (msdata[4] << 8) + msdata[5];
rdev->initiator_response_timeout = (msdata[6] << 8) + msdata[7];
out:
kfree(buffer);
return error;
}
EXPORT_SYMBOL(sas_read_port_mode_page);
static DECLARE_TRANSPORT_CLASS(sas_end_dev_class,
"sas_end_device", NULL, NULL, NULL);
#define sas_end_dev_show_simple(field, name, format_string, cast) \
static ssize_t \
show_sas_end_dev_##name(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct sas_rphy *rphy = transport_class_to_rphy(dev); \
struct sas_end_device *rdev = rphy_to_end_device(rphy); \
\
return snprintf(buf, 20, format_string, cast rdev->field); \
}
#define sas_end_dev_simple_attr(field, name, format_string, type) \
sas_end_dev_show_simple(field, name, format_string, (type)) \
static SAS_DEVICE_ATTR(end_dev, name, S_IRUGO, \
show_sas_end_dev_##name, NULL)
sas_end_dev_simple_attr(ready_led_meaning, ready_led_meaning, "%d\n", int);
sas_end_dev_simple_attr(I_T_nexus_loss_timeout, I_T_nexus_loss_timeout,
"%d\n", int);
sas_end_dev_simple_attr(initiator_response_timeout, initiator_response_timeout,
"%d\n", int);
static DECLARE_TRANSPORT_CLASS(sas_expander_class,
"sas_expander", NULL, NULL, NULL);
#define sas_expander_show_simple(field, name, format_string, cast) \
static ssize_t \
show_sas_expander_##name(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct sas_rphy *rphy = transport_class_to_rphy(dev); \
struct sas_expander_device *edev = rphy_to_expander_device(rphy); \
\
return snprintf(buf, 20, format_string, cast edev->field); \
}
#define sas_expander_simple_attr(field, name, format_string, type) \
sas_expander_show_simple(field, name, format_string, (type)) \
static SAS_DEVICE_ATTR(expander, name, S_IRUGO, \
show_sas_expander_##name, NULL)
sas_expander_simple_attr(vendor_id, vendor_id, "%s\n", char *);
sas_expander_simple_attr(product_id, product_id, "%s\n", char *);
sas_expander_simple_attr(product_rev, product_rev, "%s\n", char *);
sas_expander_simple_attr(component_vendor_id, component_vendor_id,
"%s\n", char *);
sas_expander_simple_attr(component_id, component_id, "%u\n", unsigned int);
sas_expander_simple_attr(component_revision_id, component_revision_id, "%u\n",
unsigned int);
sas_expander_simple_attr(level, level, "%d\n", int);
static DECLARE_TRANSPORT_CLASS(sas_rphy_class,
"sas_device", NULL, NULL, NULL);
static int sas_rphy_match(struct attribute_container *cont, struct device *dev)
{
struct Scsi_Host *shost;
struct sas_internal *i;
if (!scsi_is_sas_rphy(dev))
return 0;
shost = dev_to_shost(dev->parent->parent);
if (!shost->transportt)
return 0;
if (shost->transportt->host_attrs.ac.class !=
&sas_host_class.class)
return 0;
i = to_sas_internal(shost->transportt);
return &i->rphy_attr_cont.ac == cont;
}
static int sas_end_dev_match(struct attribute_container *cont,
struct device *dev)
{
struct Scsi_Host *shost;
struct sas_internal *i;
struct sas_rphy *rphy;
if (!scsi_is_sas_rphy(dev))
return 0;
shost = dev_to_shost(dev->parent->parent);
rphy = dev_to_rphy(dev);
if (!shost->transportt)
return 0;
if (shost->transportt->host_attrs.ac.class !=
&sas_host_class.class)
return 0;
i = to_sas_internal(shost->transportt);
return &i->end_dev_attr_cont.ac == cont &&
rphy->identify.device_type == SAS_END_DEVICE;
}
static int sas_expander_match(struct attribute_container *cont,
struct device *dev)
{
struct Scsi_Host *shost;
struct sas_internal *i;
struct sas_rphy *rphy;
if (!scsi_is_sas_rphy(dev))
return 0;
shost = dev_to_shost(dev->parent->parent);
rphy = dev_to_rphy(dev);
if (!shost->transportt)
return 0;
if (shost->transportt->host_attrs.ac.class !=
&sas_host_class.class)
return 0;
i = to_sas_internal(shost->transportt);
return &i->expander_attr_cont.ac == cont &&
(rphy->identify.device_type == SAS_EDGE_EXPANDER_DEVICE ||
rphy->identify.device_type == SAS_FANOUT_EXPANDER_DEVICE);
}
static void sas_expander_release(struct device *dev)
{
struct sas_rphy *rphy = dev_to_rphy(dev);
struct sas_expander_device *edev = rphy_to_expander_device(rphy);
if (rphy->q)
blk_cleanup_queue(rphy->q);
put_device(dev->parent);
kfree(edev);
}
static void sas_end_device_release(struct device *dev)
{
struct sas_rphy *rphy = dev_to_rphy(dev);
struct sas_end_device *edev = rphy_to_end_device(rphy);
if (rphy->q)
blk_cleanup_queue(rphy->q);
put_device(dev->parent);
kfree(edev);
}
/**
* sas_rphy_initialize - common rphy intialization
* @rphy: rphy to initialise
*
* Used by both sas_end_device_alloc() and sas_expander_alloc() to
* initialise the common rphy component of each.
*/
static void sas_rphy_initialize(struct sas_rphy *rphy)
{
INIT_LIST_HEAD(&rphy->list);
}
/**
* sas_end_device_alloc - allocate an rphy for an end device
* @parent: which port
*
* Allocates an SAS remote PHY structure, connected to @parent.
*
* Returns:
* SAS PHY allocated or %NULL if the allocation failed.
*/
struct sas_rphy *sas_end_device_alloc(struct sas_port *parent)
{
struct Scsi_Host *shost = dev_to_shost(&parent->dev);
struct sas_end_device *rdev;
rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
if (!rdev) {
return NULL;
}
device_initialize(&rdev->rphy.dev);
rdev->rphy.dev.parent = get_device(&parent->dev);
rdev->rphy.dev.release = sas_end_device_release;
if (scsi_is_sas_expander_device(parent->dev.parent)) {
struct sas_rphy *rphy = dev_to_rphy(parent->dev.parent);
dev_set_name(&rdev->rphy.dev, "end_device-%d:%d:%d",
shost->host_no, rphy->scsi_target_id,
parent->port_identifier);
} else
dev_set_name(&rdev->rphy.dev, "end_device-%d:%d",
shost->host_no, parent->port_identifier);
rdev->rphy.identify.device_type = SAS_END_DEVICE;
sas_rphy_initialize(&rdev->rphy);
transport_setup_device(&rdev->rphy.dev);
return &rdev->rphy;
}
EXPORT_SYMBOL(sas_end_device_alloc);
/**
* sas_expander_alloc - allocate an rphy for an end device
* @parent: which port
* @type: SAS_EDGE_EXPANDER_DEVICE or SAS_FANOUT_EXPANDER_DEVICE
*
* Allocates an SAS remote PHY structure, connected to @parent.
*
* Returns:
* SAS PHY allocated or %NULL if the allocation failed.
*/
struct sas_rphy *sas_expander_alloc(struct sas_port *parent,
enum sas_device_type type)
{
struct Scsi_Host *shost = dev_to_shost(&parent->dev);
struct sas_expander_device *rdev;
struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
BUG_ON(type != SAS_EDGE_EXPANDER_DEVICE &&
type != SAS_FANOUT_EXPANDER_DEVICE);
rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
if (!rdev) {
return NULL;
}
device_initialize(&rdev->rphy.dev);
rdev->rphy.dev.parent = get_device(&parent->dev);
rdev->rphy.dev.release = sas_expander_release;
mutex_lock(&sas_host->lock);
rdev->rphy.scsi_target_id = sas_host->next_expander_id++;
mutex_unlock(&sas_host->lock);
dev_set_name(&rdev->rphy.dev, "expander-%d:%d",
shost->host_no, rdev->rphy.scsi_target_id);
rdev->rphy.identify.device_type = type;
sas_rphy_initialize(&rdev->rphy);
transport_setup_device(&rdev->rphy.dev);
return &rdev->rphy;
}
EXPORT_SYMBOL(sas_expander_alloc);
/**
* sas_rphy_add - add a SAS remote PHY to the device hierarchy
* @rphy: The remote PHY to be added
*
* Publishes a SAS remote PHY to the rest of the system.
*/
int sas_rphy_add(struct sas_rphy *rphy)
{
struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
struct sas_identify *identify = &rphy->identify;
int error;
if (parent->rphy)
return -ENXIO;
parent->rphy = rphy;
error = device_add(&rphy->dev);
if (error)
return error;
transport_add_device(&rphy->dev);
transport_configure_device(&rphy->dev);
if (sas_bsg_initialize(shost, rphy))
printk("fail to a bsg device %s\n", dev_name(&rphy->dev));
mutex_lock(&sas_host->lock);
list_add_tail(&rphy->list, &sas_host->rphy_list);
if (identify->device_type == SAS_END_DEVICE &&
(identify->target_port_protocols &
(SAS_PROTOCOL_SSP|SAS_PROTOCOL_STP|SAS_PROTOCOL_SATA)))
rphy->scsi_target_id = sas_host->next_target_id++;
else if (identify->device_type == SAS_END_DEVICE)
rphy->scsi_target_id = -1;
mutex_unlock(&sas_host->lock);
if (identify->device_type == SAS_END_DEVICE &&
rphy->scsi_target_id != -1) {
scsi_scan_target(&rphy->dev, 0,
rphy->scsi_target_id, SCAN_WILD_CARD, 0);
}
return 0;
}
EXPORT_SYMBOL(sas_rphy_add);
/**
* sas_rphy_free - free a SAS remote PHY
* @rphy: SAS remote PHY to free
*
* Frees the specified SAS remote PHY.
*
* Note:
* This function must only be called on a remote
* PHY that has not sucessfully been added using
* sas_rphy_add() (or has been sas_rphy_remove()'d)
*/
void sas_rphy_free(struct sas_rphy *rphy)
{
struct device *dev = &rphy->dev;
struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent->parent);
struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
mutex_lock(&sas_host->lock);
list_del(&rphy->list);
mutex_unlock(&sas_host->lock);
sas_bsg_remove(shost, rphy);
transport_destroy_device(dev);
put_device(dev);
}
EXPORT_SYMBOL(sas_rphy_free);
/**
* sas_rphy_delete - remove and free SAS remote PHY
* @rphy: SAS remote PHY to remove and free
*
* Removes the specified SAS remote PHY and frees it.
*/
void
sas_rphy_delete(struct sas_rphy *rphy)
{
sas_rphy_remove(rphy);
sas_rphy_free(rphy);
}
EXPORT_SYMBOL(sas_rphy_delete);
/**
* sas_rphy_remove - remove SAS remote PHY
* @rphy: SAS remote phy to remove
*
* Removes the specified SAS remote PHY.
*/
void
sas_rphy_remove(struct sas_rphy *rphy)
{
struct device *dev = &rphy->dev;
struct sas_port *parent = dev_to_sas_port(dev->parent);
switch (rphy->identify.device_type) {
case SAS_END_DEVICE:
scsi_remove_target(dev);
break;
case SAS_EDGE_EXPANDER_DEVICE:
case SAS_FANOUT_EXPANDER_DEVICE:
sas_remove_children(dev);
break;
default:
break;
}
transport_remove_device(dev);
device_del(dev);
parent->rphy = NULL;
}
EXPORT_SYMBOL(sas_rphy_remove);
/**
* scsi_is_sas_rphy - check if a struct device represents a SAS remote PHY
* @dev: device to check
*
* Returns:
* %1 if the device represents a SAS remote PHY, %0 else
*/
int scsi_is_sas_rphy(const struct device *dev)
{
return dev->release == sas_end_device_release ||
dev->release == sas_expander_release;
}
EXPORT_SYMBOL(scsi_is_sas_rphy);
/*
* SCSI scan helper
*/
static int sas_user_scan(struct Scsi_Host *shost, uint channel,
uint id, uint lun)
{
struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
struct sas_rphy *rphy;
mutex_lock(&sas_host->lock);
list_for_each_entry(rphy, &sas_host->rphy_list, list) {
if (rphy->identify.device_type != SAS_END_DEVICE ||
rphy->scsi_target_id == -1)
continue;
if ((channel == SCAN_WILD_CARD || channel == 0) &&
(id == SCAN_WILD_CARD || id == rphy->scsi_target_id)) {
scsi_scan_target(&rphy->dev, 0,
rphy->scsi_target_id, lun, 1);
}
}
mutex_unlock(&sas_host->lock);
return 0;
}
/*
* Setup / Teardown code
*/
#define SETUP_TEMPLATE(attrb, field, perm, test) \
i->private_##attrb[count] = dev_attr_##field; \
i->private_##attrb[count].attr.mode = perm; \
i->attrb[count] = &i->private_##attrb[count]; \
if (test) \
count++
#define SETUP_TEMPLATE_RW(attrb, field, perm, test, ro_test, ro_perm) \
i->private_##attrb[count] = dev_attr_##field; \
i->private_##attrb[count].attr.mode = perm; \
if (ro_test) { \
i->private_##attrb[count].attr.mode = ro_perm; \
i->private_##attrb[count].store = NULL; \
} \
i->attrb[count] = &i->private_##attrb[count]; \
if (test) \
count++
#define SETUP_RPORT_ATTRIBUTE(field) \
SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, 1)
#define SETUP_OPTIONAL_RPORT_ATTRIBUTE(field, func) \
SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, i->f->func)
#define SETUP_PHY_ATTRIBUTE(field) \
SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, 1)
#define SETUP_PHY_ATTRIBUTE_RW(field) \
SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1, \
!i->f->set_phy_speed, S_IRUGO)
#define SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(field, func) \
SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1, \
!i->f->func, S_IRUGO)
#define SETUP_PORT_ATTRIBUTE(field) \
SETUP_TEMPLATE(port_attrs, field, S_IRUGO, 1)
#define SETUP_OPTIONAL_PHY_ATTRIBUTE(field, func) \
SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, i->f->func)
#define SETUP_PHY_ATTRIBUTE_WRONLY(field) \
SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, 1)
#define SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(field, func) \
SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, i->f->func)
#define SETUP_END_DEV_ATTRIBUTE(field) \
SETUP_TEMPLATE(end_dev_attrs, field, S_IRUGO, 1)
#define SETUP_EXPANDER_ATTRIBUTE(field) \
SETUP_TEMPLATE(expander_attrs, expander_##field, S_IRUGO, 1)
/**
* sas_attach_transport - instantiate SAS transport template
* @ft: SAS transport class function template
*/
struct scsi_transport_template *
sas_attach_transport(struct sas_function_template *ft)
{
struct sas_internal *i;
int count;
i = kzalloc(sizeof(struct sas_internal), GFP_KERNEL);
if (!i)
return NULL;
i->t.user_scan = sas_user_scan;
i->t.host_attrs.ac.attrs = &i->host_attrs[0];
i->t.host_attrs.ac.class = &sas_host_class.class;
i->t.host_attrs.ac.match = sas_host_match;
transport_container_register(&i->t.host_attrs);
i->t.host_size = sizeof(struct sas_host_attrs);
i->phy_attr_cont.ac.class = &sas_phy_class.class;
i->phy_attr_cont.ac.attrs = &i->phy_attrs[0];
i->phy_attr_cont.ac.match = sas_phy_match;
transport_container_register(&i->phy_attr_cont);
i->port_attr_cont.ac.class = &sas_port_class.class;
i->port_attr_cont.ac.attrs = &i->port_attrs[0];
i->port_attr_cont.ac.match = sas_port_match;
transport_container_register(&i->port_attr_cont);
i->rphy_attr_cont.ac.class = &sas_rphy_class.class;
i->rphy_attr_cont.ac.attrs = &i->rphy_attrs[0];
i->rphy_attr_cont.ac.match = sas_rphy_match;
transport_container_register(&i->rphy_attr_cont);
i->end_dev_attr_cont.ac.class = &sas_end_dev_class.class;
i->end_dev_attr_cont.ac.attrs = &i->end_dev_attrs[0];
i->end_dev_attr_cont.ac.match = sas_end_dev_match;
transport_container_register(&i->end_dev_attr_cont);
i->expander_attr_cont.ac.class = &sas_expander_class.class;
i->expander_attr_cont.ac.attrs = &i->expander_attrs[0];
i->expander_attr_cont.ac.match = sas_expander_match;
transport_container_register(&i->expander_attr_cont);
i->f = ft;
count = 0;
SETUP_PORT_ATTRIBUTE(num_phys);
i->host_attrs[count] = NULL;
count = 0;
SETUP_PHY_ATTRIBUTE(initiator_port_protocols);
SETUP_PHY_ATTRIBUTE(target_port_protocols);
SETUP_PHY_ATTRIBUTE(device_type);
SETUP_PHY_ATTRIBUTE(sas_address);
SETUP_PHY_ATTRIBUTE(phy_identifier);
//SETUP_PHY_ATTRIBUTE(port_identifier);
SETUP_PHY_ATTRIBUTE(negotiated_linkrate);
SETUP_PHY_ATTRIBUTE(minimum_linkrate_hw);
SETUP_PHY_ATTRIBUTE_RW(minimum_linkrate);
SETUP_PHY_ATTRIBUTE(maximum_linkrate_hw);
SETUP_PHY_ATTRIBUTE_RW(maximum_linkrate);
SETUP_PHY_ATTRIBUTE(invalid_dword_count);
SETUP_PHY_ATTRIBUTE(running_disparity_error_count);
SETUP_PHY_ATTRIBUTE(loss_of_dword_sync_count);
SETUP_PHY_ATTRIBUTE(phy_reset_problem_count);
SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(link_reset, phy_reset);
SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(hard_reset, phy_reset);
SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(enable, phy_enable);
i->phy_attrs[count] = NULL;
count = 0;
SETUP_PORT_ATTRIBUTE(num_phys);
i->port_attrs[count] = NULL;
count = 0;
SETUP_RPORT_ATTRIBUTE(rphy_initiator_port_protocols);
SETUP_RPORT_ATTRIBUTE(rphy_target_port_protocols);
SETUP_RPORT_ATTRIBUTE(rphy_device_type);
SETUP_RPORT_ATTRIBUTE(rphy_sas_address);
SETUP_RPORT_ATTRIBUTE(rphy_phy_identifier);
SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_enclosure_identifier,
get_enclosure_identifier);
SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_bay_identifier,
get_bay_identifier);
i->rphy_attrs[count] = NULL;
count = 0;
SETUP_END_DEV_ATTRIBUTE(end_dev_ready_led_meaning);
SETUP_END_DEV_ATTRIBUTE(end_dev_I_T_nexus_loss_timeout);
SETUP_END_DEV_ATTRIBUTE(end_dev_initiator_response_timeout);
i->end_dev_attrs[count] = NULL;
count = 0;
SETUP_EXPANDER_ATTRIBUTE(vendor_id);
SETUP_EXPANDER_ATTRIBUTE(product_id);
SETUP_EXPANDER_ATTRIBUTE(product_rev);
SETUP_EXPANDER_ATTRIBUTE(component_vendor_id);
SETUP_EXPANDER_ATTRIBUTE(component_id);
SETUP_EXPANDER_ATTRIBUTE(component_revision_id);
SETUP_EXPANDER_ATTRIBUTE(level);
i->expander_attrs[count] = NULL;
return &i->t;
}
EXPORT_SYMBOL(sas_attach_transport);
/**
* sas_release_transport - release SAS transport template instance
* @t: transport template instance
*/
void sas_release_transport(struct scsi_transport_template *t)
{
struct sas_internal *i = to_sas_internal(t);
transport_container_unregister(&i->t.host_attrs);
transport_container_unregister(&i->phy_attr_cont);
transport_container_unregister(&i->port_attr_cont);
transport_container_unregister(&i->rphy_attr_cont);
transport_container_unregister(&i->end_dev_attr_cont);
transport_container_unregister(&i->expander_attr_cont);
kfree(i);
}
EXPORT_SYMBOL(sas_release_transport);
static __init int sas_transport_init(void)
{
int error;
error = transport_class_register(&sas_host_class);
if (error)
goto out;
error = transport_class_register(&sas_phy_class);
if (error)
goto out_unregister_transport;
error = transport_class_register(&sas_port_class);
if (error)
goto out_unregister_phy;
error = transport_class_register(&sas_rphy_class);
if (error)
goto out_unregister_port;
error = transport_class_register(&sas_end_dev_class);
if (error)
goto out_unregister_rphy;
error = transport_class_register(&sas_expander_class);
if (error)
goto out_unregister_end_dev;
return 0;
out_unregister_end_dev:
transport_class_unregister(&sas_end_dev_class);
out_unregister_rphy:
transport_class_unregister(&sas_rphy_class);
out_unregister_port:
transport_class_unregister(&sas_port_class);
out_unregister_phy:
transport_class_unregister(&sas_phy_class);
out_unregister_transport:
transport_class_unregister(&sas_host_class);
out:
return error;
}
static void __exit sas_transport_exit(void)
{
transport_class_unregister(&sas_host_class);
transport_class_unregister(&sas_phy_class);
transport_class_unregister(&sas_port_class);
transport_class_unregister(&sas_rphy_class);
transport_class_unregister(&sas_end_dev_class);
transport_class_unregister(&sas_expander_class);
}
MODULE_AUTHOR("Christoph Hellwig");
MODULE_DESCRIPTION("SAS Transport Attributes");
MODULE_LICENSE("GPL");
module_init(sas_transport_init);
module_exit(sas_transport_exit);