| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Serial Attached SCSI (SAS) Transport Layer initialization |
| * |
| * Copyright (C) 2005 Adaptec, Inc. All rights reserved. |
| * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com> |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/init.h> |
| #include <linux/device.h> |
| #include <linux/spinlock.h> |
| #include <scsi/sas_ata.h> |
| #include <scsi/scsi_host.h> |
| #include <scsi/scsi_device.h> |
| #include <scsi/scsi_transport.h> |
| #include <scsi/scsi_transport_sas.h> |
| |
| #include "sas_internal.h" |
| |
| #include "scsi_sas_internal.h" |
| |
| static struct kmem_cache *sas_task_cache; |
| static struct kmem_cache *sas_event_cache; |
| |
| struct sas_task *sas_alloc_task(gfp_t flags) |
| { |
| struct sas_task *task = kmem_cache_zalloc(sas_task_cache, flags); |
| |
| if (task) { |
| spin_lock_init(&task->task_state_lock); |
| task->task_state_flags = SAS_TASK_STATE_PENDING; |
| } |
| |
| return task; |
| } |
| |
| struct sas_task *sas_alloc_slow_task(gfp_t flags) |
| { |
| struct sas_task *task = sas_alloc_task(flags); |
| struct sas_task_slow *slow = kmalloc(sizeof(*slow), flags); |
| |
| if (!task || !slow) { |
| if (task) |
| kmem_cache_free(sas_task_cache, task); |
| kfree(slow); |
| return NULL; |
| } |
| |
| task->slow_task = slow; |
| slow->task = task; |
| timer_setup(&slow->timer, NULL, 0); |
| init_completion(&slow->completion); |
| |
| return task; |
| } |
| |
| void sas_free_task(struct sas_task *task) |
| { |
| if (task) { |
| kfree(task->slow_task); |
| kmem_cache_free(sas_task_cache, task); |
| } |
| } |
| |
| /*------------ SAS addr hash -----------*/ |
| void sas_hash_addr(u8 *hashed, const u8 *sas_addr) |
| { |
| const u32 poly = 0x00DB2777; |
| u32 r = 0; |
| int i; |
| |
| for (i = 0; i < SAS_ADDR_SIZE; i++) { |
| int b; |
| |
| for (b = (SAS_ADDR_SIZE - 1); b >= 0; b--) { |
| r <<= 1; |
| if ((1 << b) & sas_addr[i]) { |
| if (!(r & 0x01000000)) |
| r ^= poly; |
| } else if (r & 0x01000000) { |
| r ^= poly; |
| } |
| } |
| } |
| |
| hashed[0] = (r >> 16) & 0xFF; |
| hashed[1] = (r >> 8) & 0xFF; |
| hashed[2] = r & 0xFF; |
| } |
| |
| int sas_register_ha(struct sas_ha_struct *sas_ha) |
| { |
| char name[64]; |
| int error = 0; |
| |
| mutex_init(&sas_ha->disco_mutex); |
| spin_lock_init(&sas_ha->phy_port_lock); |
| sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr); |
| |
| set_bit(SAS_HA_REGISTERED, &sas_ha->state); |
| spin_lock_init(&sas_ha->lock); |
| mutex_init(&sas_ha->drain_mutex); |
| init_waitqueue_head(&sas_ha->eh_wait_q); |
| INIT_LIST_HEAD(&sas_ha->defer_q); |
| INIT_LIST_HEAD(&sas_ha->eh_dev_q); |
| |
| sas_ha->event_thres = SAS_PHY_SHUTDOWN_THRES; |
| |
| error = sas_register_phys(sas_ha); |
| if (error) { |
| pr_notice("couldn't register sas phys:%d\n", error); |
| return error; |
| } |
| |
| error = sas_register_ports(sas_ha); |
| if (error) { |
| pr_notice("couldn't register sas ports:%d\n", error); |
| goto Undo_phys; |
| } |
| |
| error = -ENOMEM; |
| snprintf(name, sizeof(name), "%s_event_q", dev_name(sas_ha->dev)); |
| sas_ha->event_q = create_singlethread_workqueue(name); |
| if (!sas_ha->event_q) |
| goto Undo_ports; |
| |
| snprintf(name, sizeof(name), "%s_disco_q", dev_name(sas_ha->dev)); |
| sas_ha->disco_q = create_singlethread_workqueue(name); |
| if (!sas_ha->disco_q) |
| goto Undo_event_q; |
| |
| INIT_LIST_HEAD(&sas_ha->eh_done_q); |
| INIT_LIST_HEAD(&sas_ha->eh_ata_q); |
| |
| return 0; |
| |
| Undo_event_q: |
| destroy_workqueue(sas_ha->event_q); |
| Undo_ports: |
| sas_unregister_ports(sas_ha); |
| Undo_phys: |
| |
| return error; |
| } |
| EXPORT_SYMBOL_GPL(sas_register_ha); |
| |
| static void sas_disable_events(struct sas_ha_struct *sas_ha) |
| { |
| /* Set the state to unregistered to avoid further unchained |
| * events to be queued, and flush any in-progress drainers |
| */ |
| mutex_lock(&sas_ha->drain_mutex); |
| spin_lock_irq(&sas_ha->lock); |
| clear_bit(SAS_HA_REGISTERED, &sas_ha->state); |
| spin_unlock_irq(&sas_ha->lock); |
| __sas_drain_work(sas_ha); |
| mutex_unlock(&sas_ha->drain_mutex); |
| } |
| |
| int sas_unregister_ha(struct sas_ha_struct *sas_ha) |
| { |
| sas_disable_events(sas_ha); |
| sas_unregister_ports(sas_ha); |
| |
| /* flush unregistration work */ |
| mutex_lock(&sas_ha->drain_mutex); |
| __sas_drain_work(sas_ha); |
| mutex_unlock(&sas_ha->drain_mutex); |
| |
| destroy_workqueue(sas_ha->disco_q); |
| destroy_workqueue(sas_ha->event_q); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(sas_unregister_ha); |
| |
| static int sas_get_linkerrors(struct sas_phy *phy) |
| { |
| if (scsi_is_sas_phy_local(phy)) { |
| struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); |
| struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); |
| struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; |
| struct sas_internal *i = |
| to_sas_internal(sas_ha->core.shost->transportt); |
| |
| return i->dft->lldd_control_phy(asd_phy, PHY_FUNC_GET_EVENTS, NULL); |
| } |
| |
| return sas_smp_get_phy_events(phy); |
| } |
| |
| int sas_try_ata_reset(struct asd_sas_phy *asd_phy) |
| { |
| struct domain_device *dev = NULL; |
| |
| /* try to route user requested link resets through libata */ |
| if (asd_phy->port) |
| dev = asd_phy->port->port_dev; |
| |
| /* validate that dev has been probed */ |
| if (dev) |
| dev = sas_find_dev_by_rphy(dev->rphy); |
| |
| if (dev && dev_is_sata(dev)) { |
| sas_ata_schedule_reset(dev); |
| sas_ata_wait_eh(dev); |
| return 0; |
| } |
| |
| return -ENODEV; |
| } |
| |
| /* |
| * transport_sas_phy_reset - reset a phy and permit libata to manage the link |
| * |
| * phy reset request via sysfs in host workqueue context so we know we |
| * can block on eh and safely traverse the domain_device topology |
| */ |
| static int transport_sas_phy_reset(struct sas_phy *phy, int hard_reset) |
| { |
| enum phy_func reset_type; |
| |
| if (hard_reset) |
| reset_type = PHY_FUNC_HARD_RESET; |
| else |
| reset_type = PHY_FUNC_LINK_RESET; |
| |
| if (scsi_is_sas_phy_local(phy)) { |
| struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); |
| struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); |
| struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; |
| struct sas_internal *i = |
| to_sas_internal(sas_ha->core.shost->transportt); |
| |
| if (!hard_reset && sas_try_ata_reset(asd_phy) == 0) |
| return 0; |
| return i->dft->lldd_control_phy(asd_phy, reset_type, NULL); |
| } else { |
| struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); |
| struct domain_device *ddev = sas_find_dev_by_rphy(rphy); |
| struct domain_device *ata_dev = sas_ex_to_ata(ddev, phy->number); |
| |
| if (ata_dev && !hard_reset) { |
| sas_ata_schedule_reset(ata_dev); |
| sas_ata_wait_eh(ata_dev); |
| return 0; |
| } else |
| return sas_smp_phy_control(ddev, phy->number, reset_type, NULL); |
| } |
| } |
| |
| int sas_phy_enable(struct sas_phy *phy, int enable) |
| { |
| int ret; |
| enum phy_func cmd; |
| |
| if (enable) |
| cmd = PHY_FUNC_LINK_RESET; |
| else |
| cmd = PHY_FUNC_DISABLE; |
| |
| if (scsi_is_sas_phy_local(phy)) { |
| struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); |
| struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); |
| struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; |
| struct sas_internal *i = |
| to_sas_internal(sas_ha->core.shost->transportt); |
| |
| if (enable) |
| ret = transport_sas_phy_reset(phy, 0); |
| else |
| ret = i->dft->lldd_control_phy(asd_phy, cmd, NULL); |
| } else { |
| struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); |
| struct domain_device *ddev = sas_find_dev_by_rphy(rphy); |
| |
| if (enable) |
| ret = transport_sas_phy_reset(phy, 0); |
| else |
| ret = sas_smp_phy_control(ddev, phy->number, cmd, NULL); |
| } |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(sas_phy_enable); |
| |
| int sas_phy_reset(struct sas_phy *phy, int hard_reset) |
| { |
| int ret; |
| enum phy_func reset_type; |
| |
| if (!phy->enabled) |
| return -ENODEV; |
| |
| if (hard_reset) |
| reset_type = PHY_FUNC_HARD_RESET; |
| else |
| reset_type = PHY_FUNC_LINK_RESET; |
| |
| if (scsi_is_sas_phy_local(phy)) { |
| struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); |
| struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); |
| struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; |
| struct sas_internal *i = |
| to_sas_internal(sas_ha->core.shost->transportt); |
| |
| ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL); |
| } else { |
| struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); |
| struct domain_device *ddev = sas_find_dev_by_rphy(rphy); |
| ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL); |
| } |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(sas_phy_reset); |
| |
| int sas_set_phy_speed(struct sas_phy *phy, |
| struct sas_phy_linkrates *rates) |
| { |
| int ret; |
| |
| if ((rates->minimum_linkrate && |
| rates->minimum_linkrate > phy->maximum_linkrate) || |
| (rates->maximum_linkrate && |
| rates->maximum_linkrate < phy->minimum_linkrate)) |
| return -EINVAL; |
| |
| if (rates->minimum_linkrate && |
| rates->minimum_linkrate < phy->minimum_linkrate_hw) |
| rates->minimum_linkrate = phy->minimum_linkrate_hw; |
| |
| if (rates->maximum_linkrate && |
| rates->maximum_linkrate > phy->maximum_linkrate_hw) |
| rates->maximum_linkrate = phy->maximum_linkrate_hw; |
| |
| if (scsi_is_sas_phy_local(phy)) { |
| struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); |
| struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); |
| struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; |
| struct sas_internal *i = |
| to_sas_internal(sas_ha->core.shost->transportt); |
| |
| ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE, |
| rates); |
| } else { |
| struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); |
| struct domain_device *ddev = sas_find_dev_by_rphy(rphy); |
| ret = sas_smp_phy_control(ddev, phy->number, |
| PHY_FUNC_LINK_RESET, rates); |
| |
| } |
| |
| return ret; |
| } |
| |
| void sas_prep_resume_ha(struct sas_ha_struct *ha) |
| { |
| int i; |
| |
| set_bit(SAS_HA_REGISTERED, &ha->state); |
| set_bit(SAS_HA_RESUMING, &ha->state); |
| |
| /* clear out any stale link events/data from the suspension path */ |
| for (i = 0; i < ha->num_phys; i++) { |
| struct asd_sas_phy *phy = ha->sas_phy[i]; |
| |
| memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE); |
| phy->frame_rcvd_size = 0; |
| } |
| } |
| EXPORT_SYMBOL(sas_prep_resume_ha); |
| |
| static int phys_suspended(struct sas_ha_struct *ha) |
| { |
| int i, rc = 0; |
| |
| for (i = 0; i < ha->num_phys; i++) { |
| struct asd_sas_phy *phy = ha->sas_phy[i]; |
| |
| if (phy->suspended) |
| rc++; |
| } |
| |
| return rc; |
| } |
| |
| static void sas_resume_insert_broadcast_ha(struct sas_ha_struct *ha) |
| { |
| int i; |
| |
| for (i = 0; i < ha->num_phys; i++) { |
| struct asd_sas_port *port = ha->sas_port[i]; |
| struct domain_device *dev = port->port_dev; |
| |
| if (dev && dev_is_expander(dev->dev_type)) { |
| struct asd_sas_phy *first_phy; |
| |
| spin_lock(&port->phy_list_lock); |
| first_phy = list_first_entry_or_null( |
| &port->phy_list, struct asd_sas_phy, |
| port_phy_el); |
| spin_unlock(&port->phy_list_lock); |
| |
| if (first_phy) |
| sas_notify_port_event(first_phy, |
| PORTE_BROADCAST_RCVD, GFP_KERNEL); |
| } |
| } |
| } |
| |
| static void _sas_resume_ha(struct sas_ha_struct *ha, bool drain) |
| { |
| const unsigned long tmo = msecs_to_jiffies(25000); |
| int i; |
| |
| /* deform ports on phys that did not resume |
| * at this point we may be racing the phy coming back (as posted |
| * by the lldd). So we post the event and once we are in the |
| * libsas context check that the phy remains suspended before |
| * tearing it down. |
| */ |
| i = phys_suspended(ha); |
| if (i) |
| dev_info(ha->dev, "waiting up to 25 seconds for %d phy%s to resume\n", |
| i, i > 1 ? "s" : ""); |
| wait_event_timeout(ha->eh_wait_q, phys_suspended(ha) == 0, tmo); |
| for (i = 0; i < ha->num_phys; i++) { |
| struct asd_sas_phy *phy = ha->sas_phy[i]; |
| |
| if (phy->suspended) { |
| dev_warn(&phy->phy->dev, "resume timeout\n"); |
| sas_notify_phy_event(phy, PHYE_RESUME_TIMEOUT, |
| GFP_KERNEL); |
| } |
| } |
| |
| /* all phys are back up or timed out, turn on i/o so we can |
| * flush out disks that did not return |
| */ |
| scsi_unblock_requests(ha->core.shost); |
| if (drain) |
| sas_drain_work(ha); |
| clear_bit(SAS_HA_RESUMING, &ha->state); |
| |
| sas_queue_deferred_work(ha); |
| /* send event PORTE_BROADCAST_RCVD to identify some new inserted |
| * disks for expander |
| */ |
| sas_resume_insert_broadcast_ha(ha); |
| } |
| |
| void sas_resume_ha(struct sas_ha_struct *ha) |
| { |
| _sas_resume_ha(ha, true); |
| } |
| EXPORT_SYMBOL(sas_resume_ha); |
| |
| /* A no-sync variant, which does not call sas_drain_ha(). */ |
| void sas_resume_ha_no_sync(struct sas_ha_struct *ha) |
| { |
| _sas_resume_ha(ha, false); |
| } |
| EXPORT_SYMBOL(sas_resume_ha_no_sync); |
| |
| void sas_suspend_ha(struct sas_ha_struct *ha) |
| { |
| int i; |
| |
| sas_disable_events(ha); |
| scsi_block_requests(ha->core.shost); |
| for (i = 0; i < ha->num_phys; i++) { |
| struct asd_sas_port *port = ha->sas_port[i]; |
| |
| sas_discover_event(port, DISCE_SUSPEND); |
| } |
| |
| /* flush suspend events while unregistered */ |
| mutex_lock(&ha->drain_mutex); |
| __sas_drain_work(ha); |
| mutex_unlock(&ha->drain_mutex); |
| } |
| EXPORT_SYMBOL(sas_suspend_ha); |
| |
| static void sas_phy_release(struct sas_phy *phy) |
| { |
| kfree(phy->hostdata); |
| phy->hostdata = NULL; |
| } |
| |
| static void phy_reset_work(struct work_struct *work) |
| { |
| struct sas_phy_data *d = container_of(work, typeof(*d), reset_work.work); |
| |
| d->reset_result = transport_sas_phy_reset(d->phy, d->hard_reset); |
| } |
| |
| static void phy_enable_work(struct work_struct *work) |
| { |
| struct sas_phy_data *d = container_of(work, typeof(*d), enable_work.work); |
| |
| d->enable_result = sas_phy_enable(d->phy, d->enable); |
| } |
| |
| static int sas_phy_setup(struct sas_phy *phy) |
| { |
| struct sas_phy_data *d = kzalloc(sizeof(*d), GFP_KERNEL); |
| |
| if (!d) |
| return -ENOMEM; |
| |
| mutex_init(&d->event_lock); |
| INIT_SAS_WORK(&d->reset_work, phy_reset_work); |
| INIT_SAS_WORK(&d->enable_work, phy_enable_work); |
| d->phy = phy; |
| phy->hostdata = d; |
| |
| return 0; |
| } |
| |
| static int queue_phy_reset(struct sas_phy *phy, int hard_reset) |
| { |
| struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); |
| struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); |
| struct sas_phy_data *d = phy->hostdata; |
| int rc; |
| |
| if (!d) |
| return -ENOMEM; |
| |
| pm_runtime_get_sync(ha->dev); |
| /* libsas workqueue coordinates ata-eh reset with discovery */ |
| mutex_lock(&d->event_lock); |
| d->reset_result = 0; |
| d->hard_reset = hard_reset; |
| |
| spin_lock_irq(&ha->lock); |
| sas_queue_work(ha, &d->reset_work); |
| spin_unlock_irq(&ha->lock); |
| |
| rc = sas_drain_work(ha); |
| if (rc == 0) |
| rc = d->reset_result; |
| mutex_unlock(&d->event_lock); |
| pm_runtime_put_sync(ha->dev); |
| |
| return rc; |
| } |
| |
| static int queue_phy_enable(struct sas_phy *phy, int enable) |
| { |
| struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); |
| struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); |
| struct sas_phy_data *d = phy->hostdata; |
| int rc; |
| |
| if (!d) |
| return -ENOMEM; |
| |
| pm_runtime_get_sync(ha->dev); |
| /* libsas workqueue coordinates ata-eh reset with discovery */ |
| mutex_lock(&d->event_lock); |
| d->enable_result = 0; |
| d->enable = enable; |
| |
| spin_lock_irq(&ha->lock); |
| sas_queue_work(ha, &d->enable_work); |
| spin_unlock_irq(&ha->lock); |
| |
| rc = sas_drain_work(ha); |
| if (rc == 0) |
| rc = d->enable_result; |
| mutex_unlock(&d->event_lock); |
| pm_runtime_put_sync(ha->dev); |
| |
| return rc; |
| } |
| |
| static struct sas_function_template sft = { |
| .phy_enable = queue_phy_enable, |
| .phy_reset = queue_phy_reset, |
| .phy_setup = sas_phy_setup, |
| .phy_release = sas_phy_release, |
| .set_phy_speed = sas_set_phy_speed, |
| .get_linkerrors = sas_get_linkerrors, |
| .smp_handler = sas_smp_handler, |
| }; |
| |
| static inline ssize_t phy_event_threshold_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct Scsi_Host *shost = class_to_shost(dev); |
| struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost); |
| |
| return scnprintf(buf, PAGE_SIZE, "%u\n", sha->event_thres); |
| } |
| |
| static inline ssize_t phy_event_threshold_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct Scsi_Host *shost = class_to_shost(dev); |
| struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost); |
| |
| sha->event_thres = simple_strtol(buf, NULL, 10); |
| |
| /* threshold cannot be set too small */ |
| if (sha->event_thres < 32) |
| sha->event_thres = 32; |
| |
| return count; |
| } |
| |
| DEVICE_ATTR(phy_event_threshold, |
| S_IRUGO|S_IWUSR, |
| phy_event_threshold_show, |
| phy_event_threshold_store); |
| EXPORT_SYMBOL_GPL(dev_attr_phy_event_threshold); |
| |
| struct scsi_transport_template * |
| sas_domain_attach_transport(struct sas_domain_function_template *dft) |
| { |
| struct scsi_transport_template *stt = sas_attach_transport(&sft); |
| struct sas_internal *i; |
| |
| if (!stt) |
| return stt; |
| |
| i = to_sas_internal(stt); |
| i->dft = dft; |
| stt->create_work_queue = 1; |
| stt->eh_strategy_handler = sas_scsi_recover_host; |
| |
| return stt; |
| } |
| EXPORT_SYMBOL_GPL(sas_domain_attach_transport); |
| |
| struct asd_sas_event *sas_alloc_event(struct asd_sas_phy *phy, |
| gfp_t gfp_flags) |
| { |
| struct asd_sas_event *event; |
| struct sas_ha_struct *sas_ha = phy->ha; |
| struct sas_internal *i = |
| to_sas_internal(sas_ha->core.shost->transportt); |
| |
| event = kmem_cache_zalloc(sas_event_cache, gfp_flags); |
| if (!event) |
| return NULL; |
| |
| atomic_inc(&phy->event_nr); |
| |
| if (atomic_read(&phy->event_nr) > phy->ha->event_thres) { |
| if (i->dft->lldd_control_phy) { |
| if (cmpxchg(&phy->in_shutdown, 0, 1) == 0) { |
| pr_notice("The phy%d bursting events, shut it down.\n", |
| phy->id); |
| sas_notify_phy_event(phy, PHYE_SHUTDOWN, |
| gfp_flags); |
| } |
| } else { |
| /* Do not support PHY control, stop allocating events */ |
| WARN_ONCE(1, "PHY control not supported.\n"); |
| kmem_cache_free(sas_event_cache, event); |
| atomic_dec(&phy->event_nr); |
| event = NULL; |
| } |
| } |
| |
| return event; |
| } |
| |
| void sas_free_event(struct asd_sas_event *event) |
| { |
| struct asd_sas_phy *phy = event->phy; |
| |
| kmem_cache_free(sas_event_cache, event); |
| atomic_dec(&phy->event_nr); |
| } |
| |
| /* ---------- SAS Class register/unregister ---------- */ |
| |
| static int __init sas_class_init(void) |
| { |
| sas_task_cache = KMEM_CACHE(sas_task, SLAB_HWCACHE_ALIGN); |
| if (!sas_task_cache) |
| goto out; |
| |
| sas_event_cache = KMEM_CACHE(asd_sas_event, SLAB_HWCACHE_ALIGN); |
| if (!sas_event_cache) |
| goto free_task_kmem; |
| |
| return 0; |
| free_task_kmem: |
| kmem_cache_destroy(sas_task_cache); |
| out: |
| return -ENOMEM; |
| } |
| |
| static void __exit sas_class_exit(void) |
| { |
| kmem_cache_destroy(sas_task_cache); |
| kmem_cache_destroy(sas_event_cache); |
| } |
| |
| MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>"); |
| MODULE_DESCRIPTION("SAS Transport Layer"); |
| MODULE_LICENSE("GPL v2"); |
| |
| module_init(sas_class_init); |
| module_exit(sas_class_exit); |
| |