Loading...
1/*
2 * Serial Attached SCSI (SAS) Transport Layer initialization
3 *
4 * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
5 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
6 *
7 * This file is licensed under GPLv2.
8 *
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.
13 *
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.
18 *
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
22 * USA
23 *
24 */
25
26#include <linux/module.h>
27#include <linux/slab.h>
28#include <linux/init.h>
29#include <linux/device.h>
30#include <linux/spinlock.h>
31#include <scsi/scsi_host.h>
32#include <scsi/scsi_device.h>
33#include <scsi/scsi_transport.h>
34#include <scsi/scsi_transport_sas.h>
35
36#include "sas_internal.h"
37
38#include "../scsi_sas_internal.h"
39
40struct kmem_cache *sas_task_cache;
41
42/*------------ SAS addr hash -----------*/
43void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
44{
45 const u32 poly = 0x00DB2777;
46 u32 r = 0;
47 int i;
48
49 for (i = 0; i < 8; i++) {
50 int b;
51 for (b = 7; b >= 0; b--) {
52 r <<= 1;
53 if ((1 << b) & sas_addr[i]) {
54 if (!(r & 0x01000000))
55 r ^= poly;
56 } else if (r & 0x01000000)
57 r ^= poly;
58 }
59 }
60
61 hashed[0] = (r >> 16) & 0xFF;
62 hashed[1] = (r >> 8) & 0xFF ;
63 hashed[2] = r & 0xFF;
64}
65
66
67/* ---------- HA events ---------- */
68
69void sas_hae_reset(struct work_struct *work)
70{
71 struct sas_ha_event *ev =
72 container_of(work, struct sas_ha_event, work);
73 struct sas_ha_struct *ha = ev->ha;
74
75 sas_begin_event(HAE_RESET, &ha->event_lock,
76 &ha->pending);
77}
78
79int sas_register_ha(struct sas_ha_struct *sas_ha)
80{
81 int error = 0;
82
83 spin_lock_init(&sas_ha->phy_port_lock);
84 sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);
85
86 if (sas_ha->lldd_queue_size == 0)
87 sas_ha->lldd_queue_size = 1;
88 else if (sas_ha->lldd_queue_size == -1)
89 sas_ha->lldd_queue_size = 128; /* Sanity */
90
91 sas_ha->state = SAS_HA_REGISTERED;
92 spin_lock_init(&sas_ha->state_lock);
93
94 error = sas_register_phys(sas_ha);
95 if (error) {
96 printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
97 return error;
98 }
99
100 error = sas_register_ports(sas_ha);
101 if (error) {
102 printk(KERN_NOTICE "couldn't register sas ports:%d\n", error);
103 goto Undo_phys;
104 }
105
106 error = sas_init_events(sas_ha);
107 if (error) {
108 printk(KERN_NOTICE "couldn't start event thread:%d\n", error);
109 goto Undo_ports;
110 }
111
112 if (sas_ha->lldd_max_execute_num > 1) {
113 error = sas_init_queue(sas_ha);
114 if (error) {
115 printk(KERN_NOTICE "couldn't start queue thread:%d, "
116 "running in direct mode\n", error);
117 sas_ha->lldd_max_execute_num = 1;
118 }
119 }
120
121 INIT_LIST_HEAD(&sas_ha->eh_done_q);
122
123 return 0;
124
125Undo_ports:
126 sas_unregister_ports(sas_ha);
127Undo_phys:
128
129 return error;
130}
131
132int sas_unregister_ha(struct sas_ha_struct *sas_ha)
133{
134 unsigned long flags;
135
136 /* Set the state to unregistered to avoid further
137 * events to be queued */
138 spin_lock_irqsave(&sas_ha->state_lock, flags);
139 sas_ha->state = SAS_HA_UNREGISTERED;
140 spin_unlock_irqrestore(&sas_ha->state_lock, flags);
141 scsi_flush_work(sas_ha->core.shost);
142
143 sas_unregister_ports(sas_ha);
144
145 if (sas_ha->lldd_max_execute_num > 1) {
146 sas_shutdown_queue(sas_ha);
147 sas_ha->lldd_max_execute_num = 1;
148 }
149
150 return 0;
151}
152
153static int sas_get_linkerrors(struct sas_phy *phy)
154{
155 if (scsi_is_sas_phy_local(phy))
156 /* FIXME: we have no local phy stats
157 * gathering at this time */
158 return -EINVAL;
159
160 return sas_smp_get_phy_events(phy);
161}
162
163int sas_phy_enable(struct sas_phy *phy, int enable)
164{
165 int ret;
166 enum phy_func command;
167
168 if (enable)
169 command = PHY_FUNC_LINK_RESET;
170 else
171 command = PHY_FUNC_DISABLE;
172
173 if (scsi_is_sas_phy_local(phy)) {
174 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
175 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
176 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
177 struct sas_internal *i =
178 to_sas_internal(sas_ha->core.shost->transportt);
179
180 if (!enable) {
181 sas_phy_disconnected(asd_phy);
182 sas_ha->notify_phy_event(asd_phy, PHYE_LOSS_OF_SIGNAL);
183 }
184 ret = i->dft->lldd_control_phy(asd_phy, command, NULL);
185 } else {
186 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
187 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
188 ret = sas_smp_phy_control(ddev, phy->number, command, NULL);
189 }
190 return ret;
191}
192
193int sas_phy_reset(struct sas_phy *phy, int hard_reset)
194{
195 int ret;
196 enum phy_func reset_type;
197
198 if (hard_reset)
199 reset_type = PHY_FUNC_HARD_RESET;
200 else
201 reset_type = PHY_FUNC_LINK_RESET;
202
203 if (scsi_is_sas_phy_local(phy)) {
204 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
205 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
206 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
207 struct sas_internal *i =
208 to_sas_internal(sas_ha->core.shost->transportt);
209
210 ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
211 } else {
212 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
213 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
214 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
215 }
216 return ret;
217}
218
219int sas_set_phy_speed(struct sas_phy *phy,
220 struct sas_phy_linkrates *rates)
221{
222 int ret;
223
224 if ((rates->minimum_linkrate &&
225 rates->minimum_linkrate > phy->maximum_linkrate) ||
226 (rates->maximum_linkrate &&
227 rates->maximum_linkrate < phy->minimum_linkrate))
228 return -EINVAL;
229
230 if (rates->minimum_linkrate &&
231 rates->minimum_linkrate < phy->minimum_linkrate_hw)
232 rates->minimum_linkrate = phy->minimum_linkrate_hw;
233
234 if (rates->maximum_linkrate &&
235 rates->maximum_linkrate > phy->maximum_linkrate_hw)
236 rates->maximum_linkrate = phy->maximum_linkrate_hw;
237
238 if (scsi_is_sas_phy_local(phy)) {
239 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
240 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
241 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
242 struct sas_internal *i =
243 to_sas_internal(sas_ha->core.shost->transportt);
244
245 ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
246 rates);
247 } else {
248 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
249 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
250 ret = sas_smp_phy_control(ddev, phy->number,
251 PHY_FUNC_LINK_RESET, rates);
252
253 }
254
255 return ret;
256}
257
258static struct sas_function_template sft = {
259 .phy_enable = sas_phy_enable,
260 .phy_reset = sas_phy_reset,
261 .set_phy_speed = sas_set_phy_speed,
262 .get_linkerrors = sas_get_linkerrors,
263 .smp_handler = sas_smp_handler,
264};
265
266struct scsi_transport_template *
267sas_domain_attach_transport(struct sas_domain_function_template *dft)
268{
269 struct scsi_transport_template *stt = sas_attach_transport(&sft);
270 struct sas_internal *i;
271
272 if (!stt)
273 return stt;
274
275 i = to_sas_internal(stt);
276 i->dft = dft;
277 stt->create_work_queue = 1;
278 stt->eh_timed_out = sas_scsi_timed_out;
279 stt->eh_strategy_handler = sas_scsi_recover_host;
280
281 return stt;
282}
283EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
284
285
286void sas_domain_release_transport(struct scsi_transport_template *stt)
287{
288 sas_release_transport(stt);
289}
290EXPORT_SYMBOL_GPL(sas_domain_release_transport);
291
292/* ---------- SAS Class register/unregister ---------- */
293
294static int __init sas_class_init(void)
295{
296 sas_task_cache = kmem_cache_create("sas_task", sizeof(struct sas_task),
297 0, SLAB_HWCACHE_ALIGN, NULL);
298 if (!sas_task_cache)
299 return -ENOMEM;
300
301 return 0;
302}
303
304static void __exit sas_class_exit(void)
305{
306 kmem_cache_destroy(sas_task_cache);
307}
308
309MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
310MODULE_DESCRIPTION("SAS Transport Layer");
311MODULE_LICENSE("GPL v2");
312
313module_init(sas_class_init);
314module_exit(sas_class_exit);
315
316EXPORT_SYMBOL_GPL(sas_register_ha);
317EXPORT_SYMBOL_GPL(sas_unregister_ha);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Serial Attached SCSI (SAS) Transport Layer initialization
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/module.h>
10#include <linux/slab.h>
11#include <linux/init.h>
12#include <linux/device.h>
13#include <linux/spinlock.h>
14#include <scsi/sas_ata.h>
15#include <scsi/scsi_host.h>
16#include <scsi/scsi_device.h>
17#include <scsi/scsi_transport.h>
18#include <scsi/scsi_transport_sas.h>
19
20#include "sas_internal.h"
21
22#include "../scsi_sas_internal.h"
23
24static struct kmem_cache *sas_task_cache;
25static struct kmem_cache *sas_event_cache;
26
27struct sas_task *sas_alloc_task(gfp_t flags)
28{
29 struct sas_task *task = kmem_cache_zalloc(sas_task_cache, flags);
30
31 if (task) {
32 spin_lock_init(&task->task_state_lock);
33 task->task_state_flags = SAS_TASK_STATE_PENDING;
34 }
35
36 return task;
37}
38EXPORT_SYMBOL_GPL(sas_alloc_task);
39
40struct sas_task *sas_alloc_slow_task(gfp_t flags)
41{
42 struct sas_task *task = sas_alloc_task(flags);
43 struct sas_task_slow *slow = kmalloc(sizeof(*slow), flags);
44
45 if (!task || !slow) {
46 if (task)
47 kmem_cache_free(sas_task_cache, task);
48 kfree(slow);
49 return NULL;
50 }
51
52 task->slow_task = slow;
53 slow->task = task;
54 timer_setup(&slow->timer, NULL, 0);
55 init_completion(&slow->completion);
56
57 return task;
58}
59EXPORT_SYMBOL_GPL(sas_alloc_slow_task);
60
61void sas_free_task(struct sas_task *task)
62{
63 if (task) {
64 kfree(task->slow_task);
65 kmem_cache_free(sas_task_cache, task);
66 }
67}
68EXPORT_SYMBOL_GPL(sas_free_task);
69
70/*------------ SAS addr hash -----------*/
71void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
72{
73 const u32 poly = 0x00DB2777;
74 u32 r = 0;
75 int i;
76
77 for (i = 0; i < SAS_ADDR_SIZE; i++) {
78 int b;
79
80 for (b = (SAS_ADDR_SIZE - 1); b >= 0; b--) {
81 r <<= 1;
82 if ((1 << b) & sas_addr[i]) {
83 if (!(r & 0x01000000))
84 r ^= poly;
85 } else if (r & 0x01000000) {
86 r ^= poly;
87 }
88 }
89 }
90
91 hashed[0] = (r >> 16) & 0xFF;
92 hashed[1] = (r >> 8) & 0xFF;
93 hashed[2] = r & 0xFF;
94}
95
96int sas_register_ha(struct sas_ha_struct *sas_ha)
97{
98 char name[64];
99 int error = 0;
100
101 mutex_init(&sas_ha->disco_mutex);
102 spin_lock_init(&sas_ha->phy_port_lock);
103 sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);
104
105 set_bit(SAS_HA_REGISTERED, &sas_ha->state);
106 spin_lock_init(&sas_ha->lock);
107 mutex_init(&sas_ha->drain_mutex);
108 init_waitqueue_head(&sas_ha->eh_wait_q);
109 INIT_LIST_HEAD(&sas_ha->defer_q);
110 INIT_LIST_HEAD(&sas_ha->eh_dev_q);
111
112 sas_ha->event_thres = SAS_PHY_SHUTDOWN_THRES;
113
114 error = sas_register_phys(sas_ha);
115 if (error) {
116 pr_notice("couldn't register sas phys:%d\n", error);
117 return error;
118 }
119
120 error = sas_register_ports(sas_ha);
121 if (error) {
122 pr_notice("couldn't register sas ports:%d\n", error);
123 goto Undo_phys;
124 }
125
126 error = -ENOMEM;
127 snprintf(name, sizeof(name), "%s_event_q", dev_name(sas_ha->dev));
128 sas_ha->event_q = create_singlethread_workqueue(name);
129 if (!sas_ha->event_q)
130 goto Undo_ports;
131
132 snprintf(name, sizeof(name), "%s_disco_q", dev_name(sas_ha->dev));
133 sas_ha->disco_q = create_singlethread_workqueue(name);
134 if (!sas_ha->disco_q)
135 goto Undo_event_q;
136
137 INIT_LIST_HEAD(&sas_ha->eh_done_q);
138 INIT_LIST_HEAD(&sas_ha->eh_ata_q);
139
140 return 0;
141
142Undo_event_q:
143 destroy_workqueue(sas_ha->event_q);
144Undo_ports:
145 sas_unregister_ports(sas_ha);
146Undo_phys:
147
148 return error;
149}
150
151static void sas_disable_events(struct sas_ha_struct *sas_ha)
152{
153 /* Set the state to unregistered to avoid further unchained
154 * events to be queued, and flush any in-progress drainers
155 */
156 mutex_lock(&sas_ha->drain_mutex);
157 spin_lock_irq(&sas_ha->lock);
158 clear_bit(SAS_HA_REGISTERED, &sas_ha->state);
159 spin_unlock_irq(&sas_ha->lock);
160 __sas_drain_work(sas_ha);
161 mutex_unlock(&sas_ha->drain_mutex);
162}
163
164int sas_unregister_ha(struct sas_ha_struct *sas_ha)
165{
166 sas_disable_events(sas_ha);
167 sas_unregister_ports(sas_ha);
168
169 /* flush unregistration work */
170 mutex_lock(&sas_ha->drain_mutex);
171 __sas_drain_work(sas_ha);
172 mutex_unlock(&sas_ha->drain_mutex);
173
174 destroy_workqueue(sas_ha->disco_q);
175 destroy_workqueue(sas_ha->event_q);
176
177 return 0;
178}
179
180static int sas_get_linkerrors(struct sas_phy *phy)
181{
182 if (scsi_is_sas_phy_local(phy)) {
183 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
184 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
185 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
186 struct sas_internal *i =
187 to_sas_internal(sas_ha->core.shost->transportt);
188
189 return i->dft->lldd_control_phy(asd_phy, PHY_FUNC_GET_EVENTS, NULL);
190 }
191
192 return sas_smp_get_phy_events(phy);
193}
194
195int sas_try_ata_reset(struct asd_sas_phy *asd_phy)
196{
197 struct domain_device *dev = NULL;
198
199 /* try to route user requested link resets through libata */
200 if (asd_phy->port)
201 dev = asd_phy->port->port_dev;
202
203 /* validate that dev has been probed */
204 if (dev)
205 dev = sas_find_dev_by_rphy(dev->rphy);
206
207 if (dev && dev_is_sata(dev)) {
208 sas_ata_schedule_reset(dev);
209 sas_ata_wait_eh(dev);
210 return 0;
211 }
212
213 return -ENODEV;
214}
215
216/*
217 * transport_sas_phy_reset - reset a phy and permit libata to manage the link
218 *
219 * phy reset request via sysfs in host workqueue context so we know we
220 * can block on eh and safely traverse the domain_device topology
221 */
222static int transport_sas_phy_reset(struct sas_phy *phy, int hard_reset)
223{
224 enum phy_func reset_type;
225
226 if (hard_reset)
227 reset_type = PHY_FUNC_HARD_RESET;
228 else
229 reset_type = PHY_FUNC_LINK_RESET;
230
231 if (scsi_is_sas_phy_local(phy)) {
232 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
233 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
234 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
235 struct sas_internal *i =
236 to_sas_internal(sas_ha->core.shost->transportt);
237
238 if (!hard_reset && sas_try_ata_reset(asd_phy) == 0)
239 return 0;
240 return i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
241 } else {
242 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
243 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
244 struct domain_device *ata_dev = sas_ex_to_ata(ddev, phy->number);
245
246 if (ata_dev && !hard_reset) {
247 sas_ata_schedule_reset(ata_dev);
248 sas_ata_wait_eh(ata_dev);
249 return 0;
250 } else
251 return sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
252 }
253}
254
255static int sas_phy_enable(struct sas_phy *phy, int enable)
256{
257 int ret;
258 enum phy_func cmd;
259
260 if (enable)
261 cmd = PHY_FUNC_LINK_RESET;
262 else
263 cmd = PHY_FUNC_DISABLE;
264
265 if (scsi_is_sas_phy_local(phy)) {
266 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
267 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
268 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
269 struct sas_internal *i =
270 to_sas_internal(sas_ha->core.shost->transportt);
271
272 if (enable)
273 ret = transport_sas_phy_reset(phy, 0);
274 else
275 ret = i->dft->lldd_control_phy(asd_phy, cmd, NULL);
276 } else {
277 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
278 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
279
280 if (enable)
281 ret = transport_sas_phy_reset(phy, 0);
282 else
283 ret = sas_smp_phy_control(ddev, phy->number, cmd, NULL);
284 }
285 return ret;
286}
287
288int sas_phy_reset(struct sas_phy *phy, int hard_reset)
289{
290 int ret;
291 enum phy_func reset_type;
292
293 if (!phy->enabled)
294 return -ENODEV;
295
296 if (hard_reset)
297 reset_type = PHY_FUNC_HARD_RESET;
298 else
299 reset_type = PHY_FUNC_LINK_RESET;
300
301 if (scsi_is_sas_phy_local(phy)) {
302 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
303 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
304 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
305 struct sas_internal *i =
306 to_sas_internal(sas_ha->core.shost->transportt);
307
308 ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
309 } else {
310 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
311 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
312 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
313 }
314 return ret;
315}
316
317int sas_set_phy_speed(struct sas_phy *phy,
318 struct sas_phy_linkrates *rates)
319{
320 int ret;
321
322 if ((rates->minimum_linkrate &&
323 rates->minimum_linkrate > phy->maximum_linkrate) ||
324 (rates->maximum_linkrate &&
325 rates->maximum_linkrate < phy->minimum_linkrate))
326 return -EINVAL;
327
328 if (rates->minimum_linkrate &&
329 rates->minimum_linkrate < phy->minimum_linkrate_hw)
330 rates->minimum_linkrate = phy->minimum_linkrate_hw;
331
332 if (rates->maximum_linkrate &&
333 rates->maximum_linkrate > phy->maximum_linkrate_hw)
334 rates->maximum_linkrate = phy->maximum_linkrate_hw;
335
336 if (scsi_is_sas_phy_local(phy)) {
337 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
338 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
339 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
340 struct sas_internal *i =
341 to_sas_internal(sas_ha->core.shost->transportt);
342
343 ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
344 rates);
345 } else {
346 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
347 struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
348 ret = sas_smp_phy_control(ddev, phy->number,
349 PHY_FUNC_LINK_RESET, rates);
350
351 }
352
353 return ret;
354}
355
356void sas_prep_resume_ha(struct sas_ha_struct *ha)
357{
358 int i;
359
360 set_bit(SAS_HA_REGISTERED, &ha->state);
361
362 /* clear out any stale link events/data from the suspension path */
363 for (i = 0; i < ha->num_phys; i++) {
364 struct asd_sas_phy *phy = ha->sas_phy[i];
365
366 memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
367 phy->frame_rcvd_size = 0;
368 }
369}
370EXPORT_SYMBOL(sas_prep_resume_ha);
371
372static int phys_suspended(struct sas_ha_struct *ha)
373{
374 int i, rc = 0;
375
376 for (i = 0; i < ha->num_phys; i++) {
377 struct asd_sas_phy *phy = ha->sas_phy[i];
378
379 if (phy->suspended)
380 rc++;
381 }
382
383 return rc;
384}
385
386void sas_resume_ha(struct sas_ha_struct *ha)
387{
388 const unsigned long tmo = msecs_to_jiffies(25000);
389 int i;
390
391 /* deform ports on phys that did not resume
392 * at this point we may be racing the phy coming back (as posted
393 * by the lldd). So we post the event and once we are in the
394 * libsas context check that the phy remains suspended before
395 * tearing it down.
396 */
397 i = phys_suspended(ha);
398 if (i)
399 dev_info(ha->dev, "waiting up to 25 seconds for %d phy%s to resume\n",
400 i, i > 1 ? "s" : "");
401 wait_event_timeout(ha->eh_wait_q, phys_suspended(ha) == 0, tmo);
402 for (i = 0; i < ha->num_phys; i++) {
403 struct asd_sas_phy *phy = ha->sas_phy[i];
404
405 if (phy->suspended) {
406 dev_warn(&phy->phy->dev, "resume timeout\n");
407 sas_notify_phy_event(phy, PHYE_RESUME_TIMEOUT,
408 GFP_KERNEL);
409 }
410 }
411
412 /* all phys are back up or timed out, turn on i/o so we can
413 * flush out disks that did not return
414 */
415 scsi_unblock_requests(ha->core.shost);
416 sas_drain_work(ha);
417}
418EXPORT_SYMBOL(sas_resume_ha);
419
420void sas_suspend_ha(struct sas_ha_struct *ha)
421{
422 int i;
423
424 sas_disable_events(ha);
425 scsi_block_requests(ha->core.shost);
426 for (i = 0; i < ha->num_phys; i++) {
427 struct asd_sas_port *port = ha->sas_port[i];
428
429 sas_discover_event(port, DISCE_SUSPEND);
430 }
431
432 /* flush suspend events while unregistered */
433 mutex_lock(&ha->drain_mutex);
434 __sas_drain_work(ha);
435 mutex_unlock(&ha->drain_mutex);
436}
437EXPORT_SYMBOL(sas_suspend_ha);
438
439static void sas_phy_release(struct sas_phy *phy)
440{
441 kfree(phy->hostdata);
442 phy->hostdata = NULL;
443}
444
445static void phy_reset_work(struct work_struct *work)
446{
447 struct sas_phy_data *d = container_of(work, typeof(*d), reset_work.work);
448
449 d->reset_result = transport_sas_phy_reset(d->phy, d->hard_reset);
450}
451
452static void phy_enable_work(struct work_struct *work)
453{
454 struct sas_phy_data *d = container_of(work, typeof(*d), enable_work.work);
455
456 d->enable_result = sas_phy_enable(d->phy, d->enable);
457}
458
459static int sas_phy_setup(struct sas_phy *phy)
460{
461 struct sas_phy_data *d = kzalloc(sizeof(*d), GFP_KERNEL);
462
463 if (!d)
464 return -ENOMEM;
465
466 mutex_init(&d->event_lock);
467 INIT_SAS_WORK(&d->reset_work, phy_reset_work);
468 INIT_SAS_WORK(&d->enable_work, phy_enable_work);
469 d->phy = phy;
470 phy->hostdata = d;
471
472 return 0;
473}
474
475static int queue_phy_reset(struct sas_phy *phy, int hard_reset)
476{
477 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
478 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
479 struct sas_phy_data *d = phy->hostdata;
480 int rc;
481
482 if (!d)
483 return -ENOMEM;
484
485 /* libsas workqueue coordinates ata-eh reset with discovery */
486 mutex_lock(&d->event_lock);
487 d->reset_result = 0;
488 d->hard_reset = hard_reset;
489
490 spin_lock_irq(&ha->lock);
491 sas_queue_work(ha, &d->reset_work);
492 spin_unlock_irq(&ha->lock);
493
494 rc = sas_drain_work(ha);
495 if (rc == 0)
496 rc = d->reset_result;
497 mutex_unlock(&d->event_lock);
498
499 return rc;
500}
501
502static int queue_phy_enable(struct sas_phy *phy, int enable)
503{
504 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
505 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
506 struct sas_phy_data *d = phy->hostdata;
507 int rc;
508
509 if (!d)
510 return -ENOMEM;
511
512 /* libsas workqueue coordinates ata-eh reset with discovery */
513 mutex_lock(&d->event_lock);
514 d->enable_result = 0;
515 d->enable = enable;
516
517 spin_lock_irq(&ha->lock);
518 sas_queue_work(ha, &d->enable_work);
519 spin_unlock_irq(&ha->lock);
520
521 rc = sas_drain_work(ha);
522 if (rc == 0)
523 rc = d->enable_result;
524 mutex_unlock(&d->event_lock);
525
526 return rc;
527}
528
529static struct sas_function_template sft = {
530 .phy_enable = queue_phy_enable,
531 .phy_reset = queue_phy_reset,
532 .phy_setup = sas_phy_setup,
533 .phy_release = sas_phy_release,
534 .set_phy_speed = sas_set_phy_speed,
535 .get_linkerrors = sas_get_linkerrors,
536 .smp_handler = sas_smp_handler,
537};
538
539static inline ssize_t phy_event_threshold_show(struct device *dev,
540 struct device_attribute *attr, char *buf)
541{
542 struct Scsi_Host *shost = class_to_shost(dev);
543 struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
544
545 return scnprintf(buf, PAGE_SIZE, "%u\n", sha->event_thres);
546}
547
548static inline ssize_t phy_event_threshold_store(struct device *dev,
549 struct device_attribute *attr,
550 const char *buf, size_t count)
551{
552 struct Scsi_Host *shost = class_to_shost(dev);
553 struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
554
555 sha->event_thres = simple_strtol(buf, NULL, 10);
556
557 /* threshold cannot be set too small */
558 if (sha->event_thres < 32)
559 sha->event_thres = 32;
560
561 return count;
562}
563
564DEVICE_ATTR(phy_event_threshold,
565 S_IRUGO|S_IWUSR,
566 phy_event_threshold_show,
567 phy_event_threshold_store);
568EXPORT_SYMBOL_GPL(dev_attr_phy_event_threshold);
569
570struct scsi_transport_template *
571sas_domain_attach_transport(struct sas_domain_function_template *dft)
572{
573 struct scsi_transport_template *stt = sas_attach_transport(&sft);
574 struct sas_internal *i;
575
576 if (!stt)
577 return stt;
578
579 i = to_sas_internal(stt);
580 i->dft = dft;
581 stt->create_work_queue = 1;
582 stt->eh_strategy_handler = sas_scsi_recover_host;
583
584 return stt;
585}
586EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
587
588struct asd_sas_event *sas_alloc_event(struct asd_sas_phy *phy,
589 gfp_t gfp_flags)
590{
591 struct asd_sas_event *event;
592 struct sas_ha_struct *sas_ha = phy->ha;
593 struct sas_internal *i =
594 to_sas_internal(sas_ha->core.shost->transportt);
595
596 event = kmem_cache_zalloc(sas_event_cache, gfp_flags);
597 if (!event)
598 return NULL;
599
600 atomic_inc(&phy->event_nr);
601
602 if (atomic_read(&phy->event_nr) > phy->ha->event_thres) {
603 if (i->dft->lldd_control_phy) {
604 if (cmpxchg(&phy->in_shutdown, 0, 1) == 0) {
605 pr_notice("The phy%d bursting events, shut it down.\n",
606 phy->id);
607 sas_notify_phy_event(phy, PHYE_SHUTDOWN,
608 gfp_flags);
609 }
610 } else {
611 /* Do not support PHY control, stop allocating events */
612 WARN_ONCE(1, "PHY control not supported.\n");
613 kmem_cache_free(sas_event_cache, event);
614 atomic_dec(&phy->event_nr);
615 event = NULL;
616 }
617 }
618
619 return event;
620}
621
622void sas_free_event(struct asd_sas_event *event)
623{
624 struct asd_sas_phy *phy = event->phy;
625
626 kmem_cache_free(sas_event_cache, event);
627 atomic_dec(&phy->event_nr);
628}
629
630/* ---------- SAS Class register/unregister ---------- */
631
632static int __init sas_class_init(void)
633{
634 sas_task_cache = KMEM_CACHE(sas_task, SLAB_HWCACHE_ALIGN);
635 if (!sas_task_cache)
636 goto out;
637
638 sas_event_cache = KMEM_CACHE(asd_sas_event, SLAB_HWCACHE_ALIGN);
639 if (!sas_event_cache)
640 goto free_task_kmem;
641
642 return 0;
643free_task_kmem:
644 kmem_cache_destroy(sas_task_cache);
645out:
646 return -ENOMEM;
647}
648
649static void __exit sas_class_exit(void)
650{
651 kmem_cache_destroy(sas_task_cache);
652 kmem_cache_destroy(sas_event_cache);
653}
654
655MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
656MODULE_DESCRIPTION("SAS Transport Layer");
657MODULE_LICENSE("GPL v2");
658
659module_init(sas_class_init);
660module_exit(sas_class_exit);
661
662EXPORT_SYMBOL_GPL(sas_register_ha);
663EXPORT_SYMBOL_GPL(sas_unregister_ha);