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path: root/drivers/scsi/libsas/sas_init.c
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Diffstat (limited to 'drivers/scsi/libsas/sas_init.c')
-rw-r--r--drivers/scsi/libsas/sas_init.c107
1 files changed, 104 insertions, 3 deletions
diff --git a/drivers/scsi/libsas/sas_init.c b/drivers/scsi/libsas/sas_init.c
index 64fa6f53cb8b..c81a63b5dc71 100644
--- a/drivers/scsi/libsas/sas_init.c
+++ b/drivers/scsi/libsas/sas_init.c
@@ -39,6 +39,7 @@
#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)
{
@@ -109,6 +110,7 @@ void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
int sas_register_ha(struct sas_ha_struct *sas_ha)
{
+ char name[64];
int error = 0;
mutex_init(&sas_ha->disco_mutex);
@@ -122,6 +124,8 @@ int sas_register_ha(struct sas_ha_struct *sas_ha)
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) {
printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
@@ -140,10 +144,24 @@ int sas_register_ha(struct sas_ha_struct *sas_ha)
goto Undo_ports;
}
+ 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:
@@ -174,6 +192,9 @@ int sas_unregister_ha(struct sas_ha_struct *sas_ha)
__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;
}
@@ -364,8 +385,6 @@ void sas_prep_resume_ha(struct sas_ha_struct *ha)
struct asd_sas_phy *phy = ha->sas_phy[i];
memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
- phy->port_events_pending = 0;
- phy->phy_events_pending = 0;
phy->frame_rcvd_size = 0;
}
}
@@ -537,6 +556,37 @@ static struct sas_function_template sft = {
.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)
{
@@ -555,20 +605,71 @@ sas_domain_attach_transport(struct sas_domain_function_template *dft)
}
EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
+
+struct asd_sas_event *sas_alloc_event(struct asd_sas_phy *phy)
+{
+ struct asd_sas_event *event;
+ gfp_t flags = in_interrupt() ? GFP_ATOMIC : GFP_KERNEL;
+ 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, 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) {
+ sas_printk("The phy%02d bursting events, shut it down.\n",
+ phy->id);
+ sas_notify_phy_event(phy, PHYE_SHUTDOWN);
+ }
+ } 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)
- return -ENOMEM;
+ 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>");