[SCSI] libsas: replace event locks with atomic bitops
[linux-2.6.git] / drivers / scsi / libsas / sas_phy.c
1 /*
2  * Serial Attached SCSI (SAS) Phy class
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., 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>
28 #include <scsi/scsi_transport_sas.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 =
36                 container_of(work, struct asd_sas_event, work);
37         struct asd_sas_phy *phy = ev->phy;
38
39         clear_bit(PHYE_LOSS_OF_SIGNAL, &phy->phy_events_pending);
40         phy->error = 0;
41         sas_deform_port(phy, 1);
42 }
43
44 static void sas_phye_oob_done(struct work_struct *work)
45 {
46         struct asd_sas_event *ev =
47                 container_of(work, struct asd_sas_event, work);
48         struct asd_sas_phy *phy = ev->phy;
49
50         clear_bit(PHYE_OOB_DONE, &phy->phy_events_pending);
51         phy->error = 0;
52 }
53
54 static void sas_phye_oob_error(struct work_struct *work)
55 {
56         struct asd_sas_event *ev =
57                 container_of(work, struct asd_sas_event, work);
58         struct asd_sas_phy *phy = ev->phy;
59         struct sas_ha_struct *sas_ha = phy->ha;
60         struct asd_sas_port *port = phy->port;
61         struct sas_internal *i =
62                 to_sas_internal(sas_ha->core.shost->transportt);
63
64         clear_bit(PHYE_OOB_ERROR, &phy->phy_events_pending);
65
66         sas_deform_port(phy, 1);
67
68         if (!port && phy->enabled && i->dft->lldd_control_phy) {
69                 phy->error++;
70                 switch (phy->error) {
71                 case 1:
72                 case 2:
73                         i->dft->lldd_control_phy(phy, PHY_FUNC_HARD_RESET,
74                                                  NULL);
75                         break;
76                 case 3:
77                 default:
78                         phy->error = 0;
79                         phy->enabled = 0;
80                         i->dft->lldd_control_phy(phy, PHY_FUNC_DISABLE, NULL);
81                         break;
82                 }
83         }
84 }
85
86 static void sas_phye_spinup_hold(struct work_struct *work)
87 {
88         struct asd_sas_event *ev =
89                 container_of(work, struct asd_sas_event, work);
90         struct asd_sas_phy *phy = ev->phy;
91         struct sas_ha_struct *sas_ha = phy->ha;
92         struct sas_internal *i =
93                 to_sas_internal(sas_ha->core.shost->transportt);
94
95         clear_bit(PHYE_SPINUP_HOLD, &phy->phy_events_pending);
96
97         phy->error = 0;
98         i->dft->lldd_control_phy(phy, PHY_FUNC_RELEASE_SPINUP_HOLD, NULL);
99 }
100
101 /* ---------- Phy class registration ---------- */
102
103 int sas_register_phys(struct sas_ha_struct *sas_ha)
104 {
105         int i;
106
107         static const work_func_t sas_phy_event_fns[PHY_NUM_EVENTS] = {
108                 [PHYE_LOSS_OF_SIGNAL] = sas_phye_loss_of_signal,
109                 [PHYE_OOB_DONE] = sas_phye_oob_done,
110                 [PHYE_OOB_ERROR] = sas_phye_oob_error,
111                 [PHYE_SPINUP_HOLD] = sas_phye_spinup_hold,
112         };
113
114         static const work_func_t sas_port_event_fns[PORT_NUM_EVENTS] = {
115                 [PORTE_BYTES_DMAED] = sas_porte_bytes_dmaed,
116                 [PORTE_BROADCAST_RCVD] = sas_porte_broadcast_rcvd,
117                 [PORTE_LINK_RESET_ERR] = sas_porte_link_reset_err,
118                 [PORTE_TIMER_EVENT] = sas_porte_timer_event,
119                 [PORTE_HARD_RESET] = sas_porte_hard_reset,
120         };
121
122         /* Now register the phys. */
123         for (i = 0; i < sas_ha->num_phys; i++) {
124                 int k;
125                 struct asd_sas_phy *phy = sas_ha->sas_phy[i];
126
127                 phy->error = 0;
128                 INIT_LIST_HEAD(&phy->port_phy_el);
129                 for (k = 0; k < PORT_NUM_EVENTS; k++) {
130                         INIT_WORK(&phy->port_events[k].work,
131                                   sas_port_event_fns[k]);
132                         phy->port_events[k].phy = phy;
133                 }
134
135                 for (k = 0; k < PHY_NUM_EVENTS; k++) {
136                         INIT_WORK(&phy->phy_events[k].work,
137                                   sas_phy_event_fns[k]);
138                         phy->phy_events[k].phy = phy;
139                 }
140
141                 phy->port = NULL;
142                 phy->ha = sas_ha;
143                 spin_lock_init(&phy->frame_rcvd_lock);
144                 spin_lock_init(&phy->sas_prim_lock);
145                 phy->frame_rcvd_size = 0;
146
147                 phy->phy = sas_phy_alloc(&sas_ha->core.shost->shost_gendev,
148                                          i);
149                 if (!phy->phy)
150                         return -ENOMEM;
151
152                 phy->phy->identify.initiator_port_protocols =
153                         phy->iproto;
154                 phy->phy->identify.target_port_protocols = phy->tproto;
155                 phy->phy->identify.sas_address = SAS_ADDR(sas_ha->sas_addr);
156                 phy->phy->identify.phy_identifier = i;
157                 phy->phy->minimum_linkrate_hw = SAS_LINK_RATE_UNKNOWN;
158                 phy->phy->maximum_linkrate_hw = SAS_LINK_RATE_UNKNOWN;
159                 phy->phy->minimum_linkrate = SAS_LINK_RATE_UNKNOWN;
160                 phy->phy->maximum_linkrate = SAS_LINK_RATE_UNKNOWN;
161                 phy->phy->negotiated_linkrate = SAS_LINK_RATE_UNKNOWN;
162
163                 sas_phy_add(phy->phy);
164         }
165
166         return 0;
167 }