Linux Kernel  3.7.1
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sas_phy.c
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1 /*
2  * Serial Attached SCSI (SAS) Phy class
3  *
4  * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
5  * Copyright (C) 2005 Luben Tuikov <[email protected]>
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22  *
23  */
24 
25 #include "sas_internal.h"
26 #include <scsi/scsi_host.h>
27 #include <scsi/scsi_transport.h>
29 #include "../scsi_sas_internal.h"
30 
31 /* ---------- Phy events ---------- */
32 
33 static void sas_phye_loss_of_signal(struct work_struct *work)
34 {
35  struct asd_sas_event *ev = to_asd_sas_event(work);
36  struct asd_sas_phy *phy = ev->phy;
37 
39  phy->error = 0;
40  sas_deform_port(phy, 1);
41 }
42 
43 static void sas_phye_oob_done(struct work_struct *work)
44 {
45  struct asd_sas_event *ev = to_asd_sas_event(work);
46  struct asd_sas_phy *phy = ev->phy;
47 
49  phy->error = 0;
50 }
51 
52 static void sas_phye_oob_error(struct work_struct *work)
53 {
54  struct asd_sas_event *ev = to_asd_sas_event(work);
55  struct asd_sas_phy *phy = ev->phy;
56  struct sas_ha_struct *sas_ha = phy->ha;
57  struct asd_sas_port *port = phy->port;
58  struct sas_internal *i =
59  to_sas_internal(sas_ha->core.shost->transportt);
60 
62 
63  sas_deform_port(phy, 1);
64 
65  if (!port && phy->enabled && i->dft->lldd_control_phy) {
66  phy->error++;
67  switch (phy->error) {
68  case 1:
69  case 2:
70  i->dft->lldd_control_phy(phy, PHY_FUNC_HARD_RESET,
71  NULL);
72  break;
73  case 3:
74  default:
75  phy->error = 0;
76  phy->enabled = 0;
77  i->dft->lldd_control_phy(phy, PHY_FUNC_DISABLE, NULL);
78  break;
79  }
80  }
81 }
82 
83 static void sas_phye_spinup_hold(struct work_struct *work)
84 {
85  struct asd_sas_event *ev = to_asd_sas_event(work);
86  struct asd_sas_phy *phy = ev->phy;
87  struct sas_ha_struct *sas_ha = phy->ha;
88  struct sas_internal *i =
89  to_sas_internal(sas_ha->core.shost->transportt);
90 
92 
93  phy->error = 0;
94  i->dft->lldd_control_phy(phy, PHY_FUNC_RELEASE_SPINUP_HOLD, NULL);
95 }
96 
97 static void sas_phye_resume_timeout(struct work_struct *work)
98 {
99  struct asd_sas_event *ev = to_asd_sas_event(work);
100  struct asd_sas_phy *phy = ev->phy;
101 
103 
104  /* phew, lldd got the phy back in the nick of time */
105  if (!phy->suspended) {
106  dev_info(&phy->phy->dev, "resume timeout cancelled\n");
107  return;
108  }
109 
110  phy->error = 0;
111  phy->suspended = 0;
112  sas_deform_port(phy, 1);
113 }
114 
115 
116 /* ---------- Phy class registration ---------- */
117 
118 int sas_register_phys(struct sas_ha_struct *sas_ha)
119 {
120  int i;
121 
122  static const work_func_t sas_phy_event_fns[PHY_NUM_EVENTS] = {
123  [PHYE_LOSS_OF_SIGNAL] = sas_phye_loss_of_signal,
124  [PHYE_OOB_DONE] = sas_phye_oob_done,
125  [PHYE_OOB_ERROR] = sas_phye_oob_error,
126  [PHYE_SPINUP_HOLD] = sas_phye_spinup_hold,
127  [PHYE_RESUME_TIMEOUT] = sas_phye_resume_timeout,
128 
129  };
130 
131  static const work_func_t sas_port_event_fns[PORT_NUM_EVENTS] = {
137  };
138 
139  /* Now register the phys. */
140  for (i = 0; i < sas_ha->num_phys; i++) {
141  int k;
142  struct asd_sas_phy *phy = sas_ha->sas_phy[i];
143 
144  phy->error = 0;
145  INIT_LIST_HEAD(&phy->port_phy_el);
146  for (k = 0; k < PORT_NUM_EVENTS; k++) {
147  INIT_SAS_WORK(&phy->port_events[k].work, sas_port_event_fns[k]);
148  phy->port_events[k].phy = phy;
149  }
150 
151  for (k = 0; k < PHY_NUM_EVENTS; k++) {
152  INIT_SAS_WORK(&phy->phy_events[k].work, sas_phy_event_fns[k]);
153  phy->phy_events[k].phy = phy;
154  }
155 
156  phy->port = NULL;
157  phy->ha = sas_ha;
160  phy->frame_rcvd_size = 0;
161 
162  phy->phy = sas_phy_alloc(&sas_ha->core.shost->shost_gendev, i);
163  if (!phy->phy)
164  return -ENOMEM;
165 
166  phy->phy->identify.initiator_port_protocols =
167  phy->iproto;
168  phy->phy->identify.target_port_protocols = phy->tproto;
169  phy->phy->identify.sas_address = SAS_ADDR(sas_ha->sas_addr);
170  phy->phy->identify.phy_identifier = i;
171  phy->phy->minimum_linkrate_hw = SAS_LINK_RATE_UNKNOWN;
172  phy->phy->maximum_linkrate_hw = SAS_LINK_RATE_UNKNOWN;
173  phy->phy->minimum_linkrate = SAS_LINK_RATE_UNKNOWN;
174  phy->phy->maximum_linkrate = SAS_LINK_RATE_UNKNOWN;
175  phy->phy->negotiated_linkrate = SAS_LINK_RATE_UNKNOWN;
176 
177  sas_phy_add(phy->phy);
178  }
179 
180  return 0;
181 }