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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/scsi/libsas/sas_init.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/scsi/libsas/sas_init.c')
-rw-r--r--drivers/scsi/libsas/sas_init.c714
1 files changed, 714 insertions, 0 deletions
diff --git a/drivers/scsi/libsas/sas_init.c b/drivers/scsi/libsas/sas_init.c
new file mode 100644
index 000000000..e4f77072a
--- /dev/null
+++ b/drivers/scsi/libsas/sas_init.c
@@ -0,0 +1,714 @@
+// 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;
+}
+EXPORT_SYMBOL_GPL(sas_alloc_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;
+}
+EXPORT_SYMBOL_GPL(sas_alloc_slow_task);
+
+void sas_free_task(struct sas_task *task)
+{
+ if (task) {
+ kfree(task->slow_task);
+ kmem_cache_free(sas_task_cache, task);
+ }
+}
+EXPORT_SYMBOL_GPL(sas_free_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);
+