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OpenCloudOS-Kernel/drivers/scsi/scsi_transport_sas.c

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/*
* 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_cmnd.h>
#include <scsi/scsi_request.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_LINK_RATE_12_0_GBPS, "12.0 Gbit" },
};
sas_bitfield_name_search(linkspeed, sas_linkspeed_names)
sas_bitfield_name_set(linkspeed, sas_linkspeed_names)
static struct sas_end_device *sas_sdev_to_rdev(struct scsi_device *sdev)
{
struct sas_rphy *rphy = target_to_rphy(sdev->sdev_target);
struct sas_end_device *rdev;
BUG_ON(rphy->identify.device_type != SAS_END_DEVICE);
rdev = rphy_to_end_device(rphy);
return rdev;
}
static int sas_smp_dispatch(struct bsg_job *job)
{
struct Scsi_Host *shost = dev_to_shost(job->dev);
struct sas_rphy *rphy = NULL;
if (!scsi_is_host_device(job->dev))
rphy = dev_to_rphy(job->dev);
if (!job->reply_payload.payload_len) {
dev_warn(job->dev, "space for a smp response is missing\n");
bsg_job_done(job, -EINVAL, 0);
return 0;
}
to_sas_internal(shost->transportt)->f->smp_handler(job, shost, rphy);
return 0;
}
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;
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 = bsg_setup_queue(&rphy->dev, dev_name(&rphy->dev),
sas_smp_dispatch, 0, NULL);
if (IS_ERR(q))
return PTR_ERR(q);
rphy->q = q;
} else {
char name[20];
snprintf(name, sizeof(name), "sas_host%d", shost->host_no);
q = bsg_setup_queue(&shost->shost_gendev, name,
sas_smp_dispatch, 0, sas_host_release);
if (IS_ERR(q))
return PTR_ERR(q);
to_sas_host_attrs(shost)->q = q;
}
/*
* by default assume old behaviour and bounce for any highmem page
*/
blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH);
blk_queue_flag_set(QUEUE_FLAG_BIDI, q);
return 0;
}
/*
* 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);
struct request_queue *q = to_sas_host_attrs(shost)->q;
if (q)
bsg_unregister_queue(q);
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 and remove the
* Scsi_Host as well.
*
* Note: Do not call scsi_remove_host() on the Scsi_Host any more, as it is
* already removed.
*/
void sas_remove_host(struct Scsi_Host *shost)
{
sas_remove_children(&shost->shost_gendev);
scsi_remove_host(shost);
}
EXPORT_SYMBOL(sas_remove_host);
/**
* sas_get_address - return the SAS address of the device
* @sdev: scsi device
*
* Returns the SAS address of the scsi device
*/
u64 sas_get_address(struct scsi_device *sdev)
{
struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
return rdev->rphy.identify.sas_address;
}
EXPORT_SYMBOL(sas_get_address);
/**
* sas_tlr_supported - checking TLR bit in vpd 0x90
* @sdev: scsi device struct
*
* Check Transport Layer Retries are supported or not.
* If vpd page 0x90 is present, TRL is supported.
*
*/
unsigned int
sas_tlr_supported(struct scsi_device *sdev)
{
const int vpd_len = 32;
struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
char *buffer = kzalloc(vpd_len, GFP_KERNEL);
int ret = 0;
if (!buffer)
goto out;
if (scsi_get_vpd_page(sdev, 0x90, buffer, vpd_len))
goto out;
/*
* Magic numbers: the VPD Protocol page (0x90)
* has a 4 byte header and then one entry per device port
* the TLR bit is at offset 8 on each port entry
* if we take the first port, that's at total offset 12
*/
ret = buffer[12] & 0x01;
out:
kfree(buffer);
rdev->tlr_supported = ret;
return ret;
}
EXPORT_SYMBOL_GPL(sas_tlr_supported);
/**
* sas_disable_tlr - setting TLR flags
* @sdev: scsi device struct
*
* Seting tlr_enabled flag to 0.
*
*/
void
sas_disable_tlr(struct scsi_device *sdev)
{
struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
rdev->tlr_enabled = 0;
}
EXPORT_SYMBOL_GPL(sas_disable_tlr);
/**
* sas_enable_tlr - setting TLR flags
* @sdev: scsi device struct
*
* Seting tlr_enabled flag 1.
*
*/
void sas_enable_tlr(struct scsi_device *sdev)
{
unsigned int tlr_supported = 0;
tlr_supported = sas_tlr_supported(sdev);
if (tlr_supported) {
struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
rdev->tlr_enabled = 1;
}
return;
}
EXPORT_SYMBOL_GPL(sas_enable_tlr);
unsigned int sas_is_tlr_enabled(struct scsi_device *sdev)
{
struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
return rdev->tlr_enabled;
}
EXPORT_SYMBOL_GPL(sas_is_tlr_enabled);
/*
* 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;
phy->enabled = 1;
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 int sas_phy_setup(struct transport_container *tc, struct device *dev,
struct device *cdev)
{
struct sas_phy *phy = dev_to_phy(dev);
struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
struct sas_internal *i = to_sas_internal(shost->transportt);
if (i->f->phy_setup)
i->f->phy_setup(phy);
return 0;
}
static DECLARE_TRANSPORT_CLASS(sas_phy_class,
"sas_phy", sas_phy_setup, 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);
struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
struct sas_internal *i = to_sas_internal(shost->transportt);
if (i->f->phy_release)
i->f->phy_release(phy);
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
* successfully 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
* successfully 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_get_phy - try to take a reference on a port member
* @port: port to check
*/
struct sas_phy *sas_port_get_phy(struct sas_port *port)
{
struct sas_phy *phy;
mutex_lock(&port->phy_list_mutex);
if (list_empty(&port->phy_list))
phy = NULL;
else {
struct list_head *ent = port->phy_list.next;
phy = list_entry(ent, typeof(*phy), port_siblings);
get_device(&phy->dev);
}
mutex_unlock(&port->phy_list_mutex);
return phy;
}
EXPORT_SYMBOL(sas_port_get_phy);
/**
* 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;
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;
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);
sas_rphy_simple_attr(scsi_target_id, scsi_target_id, "%d\n", u32);
/* 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_end_device *rdev = sas_sdev_to_rdev(sdev);
struct scsi_mode_data mode_data;
int res, error;
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);
sas_end_dev_simple_attr(tlr_supported, tlr_supported,
"%d\n", int);
sas_end_dev_simple_attr(tlr_enabled, tlr_enabled,
"%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 initialization
* @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) {
int lun;
if (identify->target_port_protocols & SAS_PROTOCOL_SSP)
lun = SCAN_WILD_CARD;
else
lun = 0;
scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id, lun,
SCSI_SCAN_INITIAL);
}
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 successfully 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);
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_unlink - unlink SAS remote PHY
* @rphy: SAS remote phy to unlink from its parent port
*
* Removes port reference to an rphy
*/
void sas_rphy_unlink(struct sas_rphy *rphy)
{
struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
parent->rphy = NULL;
}
EXPORT_SYMBOL(sas_rphy_unlink);
/**
* 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;
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;
}
sas_rphy_unlink(rphy);
if (rphy->q)
bsg_unregister_queue(rphy->q);
transport_remove_device(dev);
device_del(dev);
}
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, u64 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, SCSI_SCAN_MANUAL);
}
}
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_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_RPORT_ATTRIBUTE(rphy_scsi_target_id);
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);
SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_supported);
SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_enabled);
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);
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