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         phy->in_shutdown = 0;
  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         phy->in_shutdown = 0;
  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         sas_deform_port(phy, 1);
  62
  63         if (!port && phy->enabled && i->dft->lldd_control_phy) {
  64                 phy->error++;
  65                 switch (phy->error) {
  66                 case 1:
  67                 case 2:
  68                         i->dft->lldd_control_phy(phy, PHY_FUNC_HARD_RESET,
  69                                                  NULL);
  70                         break;
  71                 case 3:
  72                 default:
  73                         phy->error = 0;
  74                         phy->enabled = 0;
  75                         i->dft->lldd_control_phy(phy, PHY_FUNC_DISABLE, NULL);
  76                         break;
  77                 }
  78         }
  79 }
  80
  81 static void sas_phye_spinup_hold(struct work_struct *work)
  82 {
  83         struct asd_sas_event *ev = to_asd_sas_event(work);
  84         struct asd_sas_phy *phy = ev->phy;
  85         struct sas_ha_struct *sas_ha = phy->ha;
  86         struct sas_internal *i =
  87                 to_sas_internal(sas_ha->core.shost->transportt);
  88
  89         phy->error = 0;
  90         i->dft->lldd_control_phy(phy, PHY_FUNC_RELEASE_SPINUP_HOLD, NULL);
  91 }
  92
  93 static void sas_phye_resume_timeout(struct work_struct *work)
  94 {
  95         struct asd_sas_event *ev = to_asd_sas_event(work);
  96         struct asd_sas_phy *phy = ev->phy;
  97
  98         /* phew, lldd got the phy back in the nick of time */
  99         if (!phy->suspended) {
 100                 dev_info(&phy->phy->dev, "resume timeout cancelled\n");
 101                 return;
 102         }
 103
 104         phy->error = 0;
 105         phy->suspended = 0;
 106         sas_deform_port(phy, 1);
 107 }
 108
 109
 110 static void sas_phye_shutdown(struct work_struct *work)
 111 {
 112         struct asd_sas_event *ev = to_asd_sas_event(work);
 113         struct asd_sas_phy *phy = ev->phy;
 114         struct sas_ha_struct *sas_ha = phy->ha;
 115         struct sas_internal *i =
 116                 to_sas_internal(sas_ha->core.shost->transportt);
 117
 118         if (phy->enabled) {
 119                 int ret;
 120
 121                 phy->error = 0;
 122                 phy->enabled = 0;
 123                 ret = i->dft->lldd_control_phy(phy, PHY_FUNC_DISABLE, NULL);
 124                 if (ret)
 125                         sas_printk("lldd disable phy%02d returned %d\n",
 126                                 phy->id, ret);
 127         } else
 128                 sas_printk("phy%02d is not enabled, cannot shutdown\n",
 129                         phy->id);
 130 }
 131
 132 /* ---------- Phy class registration ---------- */
 133
 134 int sas_register_phys(struct sas_ha_struct *sas_ha)
 135 {
 136         int i;
 137
 138         /* Now register the phys. */
 139         for (i = 0; i < sas_ha->num_phys; i++) {
 140                 struct asd_sas_phy *phy = sas_ha->sas_phy[i];
 141
 142                 phy->error = 0;
 143                 atomic_set(&phy->event_nr, 0);
 144                 INIT_LIST_HEAD(&phy->port_phy_el);
 145
 146                 phy->port = NULL;
 147                 phy->ha = sas_ha;
 148                 spin_lock_init(&phy->frame_rcvd_lock);
 149                 spin_lock_init(&phy->sas_prim_lock);
 150                 phy->frame_rcvd_size = 0;
 151
 152                 phy->phy = sas_phy_alloc(&sas_ha->core.shost->shost_gendev, i);
 153                 if (!phy->phy)
 154                         return -ENOMEM;
 155
 156                 phy->phy->identify.initiator_port_protocols =
 157                         phy->iproto;
 158                 phy->phy->identify.target_port_protocols = phy->tproto;
 159                 phy->phy->identify.sas_address = SAS_ADDR(sas_ha->sas_addr);
 160                 phy->phy->identify.phy_identifier = i;
 161                 phy->phy->minimum_linkrate_hw = SAS_LINK_RATE_UNKNOWN;
 162                 phy->phy->maximum_linkrate_hw = SAS_LINK_RATE_UNKNOWN;
 163                 phy->phy->minimum_linkrate = SAS_LINK_RATE_UNKNOWN;
 164                 phy->phy->maximum_linkrate = SAS_LINK_RATE_UNKNOWN;
 165                 phy->phy->negotiated_linkrate = SAS_LINK_RATE_UNKNOWN;
 166
 167                 sas_phy_add(phy->phy);
 168         }
 169
 170         return 0;
 171 }
 172
 173 const work_func_t sas_phy_event_fns[PHY_NUM_EVENTS] = {
 174         [PHYE_LOSS_OF_SIGNAL] = sas_phye_loss_of_signal,
 175         [PHYE_OOB_DONE] = sas_phye_oob_done,
 176         [PHYE_OOB_ERROR] = sas_phye_oob_error,
 177         [PHYE_SPINUP_HOLD] = sas_phye_spinup_hold,
 178         [PHYE_RESUME_TIMEOUT] = sas_phye_resume_timeout,
 179         [PHYE_SHUTDOWN] = sas_phye_shutdown,
 180 };