diff options
Diffstat (limited to 'kernel/drivers/scsi/scsi_transport_sas.c')
| -rw-r--r-- | kernel/drivers/scsi/scsi_transport_sas.c | 1971 |
1 files changed, 1971 insertions, 0 deletions
diff --git a/kernel/drivers/scsi/scsi_transport_sas.c b/kernel/drivers/scsi/scsi_transport_sas.c new file mode 100644 index 000000000..9a058194b --- /dev/null +++ b/kernel/drivers/scsi/scsi_transport_sas.c @@ -0,0 +1,1971 @@ +/* + * 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_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 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 ((req = blk_fetch_request(q)) != NULL) { + spin_unlock_irq(q->queue_lock); + + handler = to_sas_internal(shost->transportt)->f->smp_handler; + ret = handler(shost, rphy, req); + req->errors = ret; + + blk_end_request_all(req, ret); + + spin_lock_irq(q->queue_lock); + } +} + +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_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 (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; + + /* + * 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_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 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) { + 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, 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 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); + sas_bsg_remove(NULL, rphy); + 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, 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_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); + 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); |