kernel/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 = to_asd_sas_event(work);
  36         struct asd_sas_phy *phy = ev->phy;
  37
  38         clear_bit(PHYE_LOSS_OF_SIGNAL, &phy->phy_events_pending);
  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
  48         clear_bit(PHYE_OOB_DONE, &phy->phy_events_pending);
  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
  61         clear_bit(PHYE_OOB_ERROR, &phy->phy_events_pending);
  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
  91         clear_bit(PHYE_SPINUP_HOLD, &phy->phy_events_pending);
  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
 102         clear_bit(PHYE_RESUME_TIMEOUT, &phy->phy_events_pending);
 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] = {
 132                 [PORTE_BYTES_DMAED] = sas_porte_bytes_dmaed,
 133                 [PORTE_BROADCAST_RCVD] = sas_porte_broadcast_rcvd,
 134                 [PORTE_LINK_RESET_ERR] = sas_porte_link_reset_err,
 135                 [PORTE_TIMER_EVENT] = sas_porte_timer_event,
 136                 [PORTE_HARD_RESET] = sas_porte_hard_reset,
 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;
 158                 spin_lock_init(&phy->frame_rcvd_lock);
 159                 spin_lock_init(&phy->sas_prim_lock);
 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 }