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->error = 0;
  39         sas_deform_port(phy, 1);
  40 }
  41
  42 static void sas_phye_oob_done(struct work_struct *work)
  43 {
  44         struct asd_sas_event *ev = to_asd_sas_event(work);
  45         struct asd_sas_phy *phy = ev->phy;
  46
  47         phy->error = 0;
  48 }
  49
  50 static void sas_phye_oob_error(struct work_struct *work)
  51 {
  52         struct asd_sas_event *ev = to_asd_sas_event(work);
  53         struct asd_sas_phy *phy = ev->phy;
  54         struct sas_ha_struct *sas_ha = phy->ha;
  55         struct asd_sas_port *port = phy->port;
  56         struct sas_internal *i =
  57                 to_sas_internal(sas_ha->core.shost->transportt);
  58
  59         sas_deform_port(phy, 1);
  60
  61         if (!port && phy->enabled && i->dft->lldd_control_phy) {
  62                 phy->error++;
  63                 switch (phy->error) {
  64                 case 1:
  65                 case 2:
  66                         i->dft->lldd_control_phy(phy, PHY_FUNC_HARD_RESET,
  67                                                  NULL);
  68                         break;
  69                 case 3:
  70                 default:
  71                         phy->error = 0;
  72                         phy->enabled = 0;
  73                         i->dft->lldd_control_phy(phy, PHY_FUNC_DISABLE, NULL);
  74                         break;
  75                 }
  76         }
  77 }
  78
  79 static void sas_phye_spinup_hold(struct work_struct *work)
  80 {
  81         struct asd_sas_event *ev = to_asd_sas_event(work);
  82         struct asd_sas_phy *phy = ev->phy;
  83         struct sas_ha_struct *sas_ha = phy->ha;
  84         struct sas_internal *i =
  85                 to_sas_internal(sas_ha->core.shost->transportt);
  86
  87         phy->error = 0;
  88         i->dft->lldd_control_phy(phy, PHY_FUNC_RELEASE_SPINUP_HOLD, NULL);
  89 }
  90
  91 static void sas_phye_resume_timeout(struct work_struct *work)
  92 {
  93         struct asd_sas_event *ev = to_asd_sas_event(work);
  94         struct asd_sas_phy *phy = ev->phy;
  95
  96         /* phew, lldd got the phy back in the nick of time */
  97         if (!phy->suspended) {
  98                 dev_info(&phy->phy->dev, "resume timeout cancelled\n");
  99                 return;
 100         }
 101
 102         phy->error = 0;
 103         phy->suspended = 0;
 104         sas_deform_port(phy, 1);
 105 }
 106
 107
 108 static void sas_phye_shutdown(struct work_struct *work)
 109 {
 110         struct asd_sas_event *ev = to_asd_sas_event(work);
 111         struct asd_sas_phy *phy = ev->phy;
 112         struct sas_ha_struct *sas_ha = phy->ha;
 113         struct sas_internal *i =
 114                 to_sas_internal(sas_ha->core.shost->transportt);
 115
 116         if (phy->enabled) {
 117                 int ret;
 118
 119                 phy->error = 0;
 120                 phy->enabled = 0;
 121                 ret = i->dft->lldd_control_phy(phy, PHY_FUNC_DISABLE, NULL);
 122                 if (ret)
 123                         pr_notice("lldd disable phy%d returned %d\n", phy->id,
 124                                   ret);
 125         } else
 126                 pr_notice("phy%d is not enabled, cannot shutdown\n", phy->id);
 127         phy->in_shutdown = 0;
 128 }
 129
 130 /* ---------- Phy class registration ---------- */
 131
 132 int sas_register_phys(struct sas_ha_struct *sas_ha)
 133 {
 134         int i;
 135
 136         /* Now register the phys. */
 137         for (i = 0; i < sas_ha->num_phys; i++) {
 138                 struct asd_sas_phy *phy = sas_ha->sas_phy[i];
 139
 140                 phy->error = 0;
 141                 atomic_set(&phy->event_nr, 0);
 142                 INIT_LIST_HEAD(&phy->port_phy_el);
 143
 144                 phy->port = NULL;
 145                 phy->ha = sas_ha;
 146                 spin_lock_init(&phy->frame_rcvd_lock);
 147                 spin_lock_init(&phy->sas_prim_lock);
 148                 phy->frame_rcvd_size = 0;
 149
 150                 phy->phy = sas_phy_alloc(&sas_ha->core.shost->shost_gendev, i);
 151                 if (!phy->phy)
 152                         return -ENOMEM;
 153
 154                 phy->phy->identify.initiator_port_protocols =
 155                         phy->iproto;
 156                 phy->phy->identify.target_port_protocols = phy->tproto;
 157                 phy->phy->identify.sas_address = SAS_ADDR(sas_ha->sas_addr);
 158                 phy->phy->identify.phy_identifier = i;
 159                 phy->phy->minimum_linkrate_hw = SAS_LINK_RATE_UNKNOWN;
 160                 phy->phy->maximum_linkrate_hw = SAS_LINK_RATE_UNKNOWN;
 161                 phy->phy->minimum_linkrate = SAS_LINK_RATE_UNKNOWN;
 162                 phy->phy->maximum_linkrate = SAS_LINK_RATE_UNKNOWN;
 163                 phy->phy->negotiated_linkrate = SAS_LINK_RATE_UNKNOWN;
 164
 165                 sas_phy_add(phy->phy);
 166         }
 167
 168         return 0;
 169 }
 170
 171 const work_func_t sas_phy_event_fns[PHY_NUM_EVENTS] = {
 172         [PHYE_LOSS_OF_SIGNAL] = sas_phye_loss_of_signal,
 173         [PHYE_OOB_DONE] = sas_phye_oob_done,
 174         [PHYE_OOB_ERROR] = sas_phye_oob_error,
 175         [PHYE_SPINUP_HOLD] = sas_phye_spinup_hold,
 176         [PHYE_RESUME_TIMEOUT] = sas_phye_resume_timeout,
 177         [PHYE_SHUTDOWN] = sas_phye_shutdown,
 178 };