2 * Serial Attached SCSI (SAS) Transport Layer initialization
4 * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
5 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
7 * This file is licensed under GPLv2.
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of the
12 * License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
26 #include <linux/module.h>
27 #include <linux/init.h>
28 #include <linux/device.h>
29 #include <linux/spinlock.h>
30 #include <scsi/scsi_host.h>
31 #include <scsi/scsi_device.h>
32 #include <scsi/scsi_transport.h>
33 #include <scsi/scsi_transport_sas.h>
35 #include "sas_internal.h"
37 #include "../scsi_sas_internal.h"
39 kmem_cache_t *sas_task_cache;
41 /*------------ SAS addr hash -----------*/
42 void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
44 const u32 poly = 0x00DB2777;
48 for (i = 0; i < 8; i++) {
50 for (b = 7; b >= 0; b--) {
52 if ((1 << b) & sas_addr[i]) {
53 if (!(r & 0x01000000))
55 } else if (r & 0x01000000)
60 hashed[0] = (r >> 16) & 0xFF;
61 hashed[1] = (r >> 8) & 0xFF ;
66 /* ---------- HA events ---------- */
68 void sas_hae_reset(void *data)
70 struct sas_ha_struct *ha = data;
72 sas_begin_event(HAE_RESET, &ha->event_lock,
76 int sas_register_ha(struct sas_ha_struct *sas_ha)
80 spin_lock_init(&sas_ha->phy_port_lock);
81 sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);
83 if (sas_ha->lldd_queue_size == 0)
84 sas_ha->lldd_queue_size = 1;
85 else if (sas_ha->lldd_queue_size == -1)
86 sas_ha->lldd_queue_size = 128; /* Sanity */
88 error = sas_register_phys(sas_ha);
90 printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
94 error = sas_register_ports(sas_ha);
96 printk(KERN_NOTICE "couldn't register sas ports:%d\n", error);
100 error = sas_init_events(sas_ha);
102 printk(KERN_NOTICE "couldn't start event thread:%d\n", error);
106 if (sas_ha->lldd_max_execute_num > 1) {
107 error = sas_init_queue(sas_ha);
109 printk(KERN_NOTICE "couldn't start queue thread:%d, "
110 "running in direct mode\n", error);
111 sas_ha->lldd_max_execute_num = 1;
118 sas_unregister_ports(sas_ha);
124 int sas_unregister_ha(struct sas_ha_struct *sas_ha)
126 if (sas_ha->lldd_max_execute_num > 1) {
127 sas_shutdown_queue(sas_ha);
130 sas_unregister_ports(sas_ha);
135 static int sas_get_linkerrors(struct sas_phy *phy)
137 if (scsi_is_sas_phy_local(phy))
138 /* FIXME: we have no local phy stats
139 * gathering at this time */
142 return sas_smp_get_phy_events(phy);
145 static int sas_phy_reset(struct sas_phy *phy, int hard_reset)
148 enum phy_func reset_type;
151 reset_type = PHY_FUNC_HARD_RESET;
153 reset_type = PHY_FUNC_LINK_RESET;
155 if (scsi_is_sas_phy_local(phy)) {
156 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
157 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
158 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
159 struct sas_internal *i =
160 to_sas_internal(sas_ha->core.shost->transportt);
162 ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
164 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
165 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
166 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
171 static int sas_set_phy_speed(struct sas_phy *phy,
172 struct sas_phy_linkrates *rates)
176 if ((rates->minimum_linkrate &&
177 rates->minimum_linkrate > phy->maximum_linkrate) ||
178 (rates->maximum_linkrate &&
179 rates->maximum_linkrate < phy->minimum_linkrate))
182 if (rates->minimum_linkrate &&
183 rates->minimum_linkrate < phy->minimum_linkrate_hw)
184 rates->minimum_linkrate = phy->minimum_linkrate_hw;
186 if (rates->maximum_linkrate &&
187 rates->maximum_linkrate > phy->maximum_linkrate_hw)
188 rates->maximum_linkrate = phy->maximum_linkrate_hw;
190 if (scsi_is_sas_phy_local(phy)) {
191 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
192 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
193 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
194 struct sas_internal *i =
195 to_sas_internal(sas_ha->core.shost->transportt);
197 ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
200 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
201 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
202 ret = sas_smp_phy_control(ddev, phy->number,
203 PHY_FUNC_LINK_RESET, rates);
210 static struct sas_function_template sft = {
211 .phy_reset = sas_phy_reset,
212 .set_phy_speed = sas_set_phy_speed,
213 .get_linkerrors = sas_get_linkerrors,
216 struct scsi_transport_template *
217 sas_domain_attach_transport(struct sas_domain_function_template *dft)
219 struct scsi_transport_template *stt = sas_attach_transport(&sft);
220 struct sas_internal *i;
225 i = to_sas_internal(stt);
227 stt->create_work_queue = 1;
228 stt->eh_timed_out = sas_scsi_timed_out;
229 stt->eh_strategy_handler = sas_scsi_recover_host;
233 EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
236 void sas_domain_release_transport(struct scsi_transport_template *stt)
238 sas_release_transport(stt);
240 EXPORT_SYMBOL_GPL(sas_domain_release_transport);
242 /* ---------- SAS Class register/unregister ---------- */
244 static int __init sas_class_init(void)
246 sas_task_cache = kmem_cache_create("sas_task", sizeof(struct sas_task),
247 0, SLAB_HWCACHE_ALIGN, NULL, NULL);
254 static void __exit sas_class_exit(void)
256 kmem_cache_destroy(sas_task_cache);
259 MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
260 MODULE_DESCRIPTION("SAS Transport Layer");
261 MODULE_LICENSE("GPL v2");
263 module_init(sas_class_init);
264 module_exit(sas_class_exit);
266 EXPORT_SYMBOL_GPL(sas_register_ha);
267 EXPORT_SYMBOL_GPL(sas_unregister_ha);