1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Serial Attached SCSI (SAS) Event processing 4 * 5 * Copyright (C) 2005 Adaptec, Inc. All rights reserved. 6 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com> 7 */ 8 9 #include <linux/export.h> 10 #include <scsi/scsi_host.h> 11 #include "sas_internal.h" 12 13 int sas_queue_work(struct sas_ha_struct *ha, struct sas_work *sw) 14 { 15 /* it's added to the defer_q when draining so return succeed */ 16 int rc = 1; 17 18 if (!test_bit(SAS_HA_REGISTERED, &ha->state)) 19 return 0; 20 21 if (test_bit(SAS_HA_DRAINING, &ha->state)) { 22 /* add it to the defer list, if not already pending */ 23 if (list_empty(&sw->drain_node)) 24 list_add_tail(&sw->drain_node, &ha->defer_q); 25 } else 26 rc = queue_work(ha->event_q, &sw->work); 27 28 return rc; 29 } 30 31 static int sas_queue_event(int event, struct sas_work *work, 32 struct sas_ha_struct *ha) 33 { 34 unsigned long flags; 35 int rc; 36 37 spin_lock_irqsave(&ha->lock, flags); 38 rc = sas_queue_work(ha, work); 39 spin_unlock_irqrestore(&ha->lock, flags); 40 41 return rc; 42 } 43 44 45 void __sas_drain_work(struct sas_ha_struct *ha) 46 { 47 struct sas_work *sw, *_sw; 48 int ret; 49 50 set_bit(SAS_HA_DRAINING, &ha->state); 51 /* flush submitters */ 52 spin_lock_irq(&ha->lock); 53 spin_unlock_irq(&ha->lock); 54 55 drain_workqueue(ha->event_q); 56 drain_workqueue(ha->disco_q); 57 58 spin_lock_irq(&ha->lock); 59 clear_bit(SAS_HA_DRAINING, &ha->state); 60 list_for_each_entry_safe(sw, _sw, &ha->defer_q, drain_node) { 61 list_del_init(&sw->drain_node); 62 ret = sas_queue_work(ha, sw); 63 if (ret != 1) 64 sas_free_event(to_asd_sas_event(&sw->work)); 65 66 } 67 spin_unlock_irq(&ha->lock); 68 } 69 70 int sas_drain_work(struct sas_ha_struct *ha) 71 { 72 int err; 73 74 err = mutex_lock_interruptible(&ha->drain_mutex); 75 if (err) 76 return err; 77 if (test_bit(SAS_HA_REGISTERED, &ha->state)) 78 __sas_drain_work(ha); 79 mutex_unlock(&ha->drain_mutex); 80 81 return 0; 82 } 83 EXPORT_SYMBOL_GPL(sas_drain_work); 84 85 void sas_disable_revalidation(struct sas_ha_struct *ha) 86 { 87 mutex_lock(&ha->disco_mutex); 88 set_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state); 89 mutex_unlock(&ha->disco_mutex); 90 } 91 92 void sas_enable_revalidation(struct sas_ha_struct *ha) 93 { 94 int i; 95 96 mutex_lock(&ha->disco_mutex); 97 clear_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state); 98 for (i = 0; i < ha->num_phys; i++) { 99 struct asd_sas_port *port = ha->sas_port[i]; 100 const int ev = DISCE_REVALIDATE_DOMAIN; 101 struct sas_discovery *d = &port->disc; 102 struct asd_sas_phy *sas_phy; 103 104 if (!test_and_clear_bit(ev, &d->pending)) 105 continue; 106 107 if (list_empty(&port->phy_list)) 108 continue; 109 110 sas_phy = container_of(port->phy_list.next, struct asd_sas_phy, 111 port_phy_el); 112 sas_notify_port_event(sas_phy, 113 PORTE_BROADCAST_RCVD, GFP_KERNEL); 114 } 115 mutex_unlock(&ha->disco_mutex); 116 } 117 118 119 static void sas_port_event_worker(struct work_struct *work) 120 { 121 struct asd_sas_event *ev = to_asd_sas_event(work); 122 123 sas_port_event_fns[ev->event](work); 124 sas_free_event(ev); 125 } 126 127 static void sas_phy_event_worker(struct work_struct *work) 128 { 129 struct asd_sas_event *ev = to_asd_sas_event(work); 130 131 sas_phy_event_fns[ev->event](work); 132 sas_free_event(ev); 133 } 134 135 int sas_notify_port_event(struct asd_sas_phy *phy, enum port_event event, 136 gfp_t gfp_flags) 137 { 138 struct sas_ha_struct *ha = phy->ha; 139 struct asd_sas_event *ev; 140 int ret; 141 142 BUG_ON(event >= PORT_NUM_EVENTS); 143 144 ev = sas_alloc_event(phy, gfp_flags); 145 if (!ev) 146 return -ENOMEM; 147 148 INIT_SAS_EVENT(ev, sas_port_event_worker, phy, event); 149 150 ret = sas_queue_event(event, &ev->work, ha); 151 if (ret != 1) 152 sas_free_event(ev); 153 154 return ret; 155 } 156 EXPORT_SYMBOL_GPL(sas_notify_port_event); 157 158 int sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event, 159 gfp_t gfp_flags) 160 { 161 struct sas_ha_struct *ha = phy->ha; 162 struct asd_sas_event *ev; 163 int ret; 164 165 BUG_ON(event >= PHY_NUM_EVENTS); 166 167 ev = sas_alloc_event(phy, gfp_flags); 168 if (!ev) 169 return -ENOMEM; 170 171 INIT_SAS_EVENT(ev, sas_phy_event_worker, phy, event); 172 173 ret = sas_queue_event(event, &ev->work, ha); 174 if (ret != 1) 175 sas_free_event(ev); 176 177 return ret; 178 } 179 EXPORT_SYMBOL_GPL(sas_notify_phy_event); 180