drivers/scsi/libsas/sas_phy.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Serial Attached SCSI (SAS) Phy class
   4  *
   5  * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
   6  * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
   7  */
   8
   9 #include "sas_internal.h"
  10 #include <scsi/scsi_host.h>
  11 #include <scsi/scsi_transport.h>
  12 #include <scsi/scsi_transport_sas.h>
  13 #include "scsi_sas_internal.h"
  14
  15 /* ---------- Phy events ---------- */
  16
  17 static void sas_phye_loss_of_signal(struct work_struct *work)
  18 {
  19         struct asd_sas_event *ev = to_asd_sas_event(work);
  20         struct asd_sas_phy *phy = ev->phy;
  21
  22         phy->error = 0;
  23         sas_deform_port(phy, 1);
  24 }
  25
  26 static void sas_phye_oob_done(struct work_struct *work)
  27 {
  28         struct asd_sas_event *ev = to_asd_sas_event(work);
  29         struct asd_sas_phy *phy = ev->phy;
  30
  31         phy->error = 0;
  32 }
  33
  34 static void sas_phye_oob_error(struct work_struct *work)
  35 {
  36         struct asd_sas_event *ev = to_asd_sas_event(work);
  37         struct asd_sas_phy *phy = ev->phy;
  38         struct sas_ha_struct *sas_ha = phy->ha;
  39         struct asd_sas_port *port = phy->port;
  40         struct sas_internal *i =
  41                 to_sas_internal(sas_ha->shost->transportt);
  42
  43         sas_deform_port(phy, 1);
  44
  45         if (!port && phy->enabled && i->dft->lldd_control_phy) {
  46                 phy->error++;
  47                 switch (phy->error) {
  48                 case 1:
  49                 case 2:
  50                         i->dft->lldd_control_phy(phy, PHY_FUNC_HARD_RESET,
  51                                                  NULL);
  52                         break;
  53                 case 3:
  54                 default:
  55                         phy->error = 0;
  56                         phy->enabled = 0;
  57                         i->dft->lldd_control_phy(phy, PHY_FUNC_DISABLE, NULL);
  58                         break;
  59                 }
  60         }
  61 }
  62
  63 static void sas_phye_spinup_hold(struct work_struct *work)
  64 {
  65         struct asd_sas_event *ev = to_asd_sas_event(work);
  66         struct asd_sas_phy *phy = ev->phy;
  67         struct sas_ha_struct *sas_ha = phy->ha;
  68         struct sas_internal *i =
  69                 to_sas_internal(sas_ha->shost->transportt);
  70
  71         phy->error = 0;
  72         i->dft->lldd_control_phy(phy, PHY_FUNC_RELEASE_SPINUP_HOLD, NULL);
  73 }
  74
  75 static void sas_phye_resume_timeout(struct work_struct *work)
  76 {
  77         struct asd_sas_event *ev = to_asd_sas_event(work);
  78         struct asd_sas_phy *phy = ev->phy;
  79
  80         /* phew, lldd got the phy back in the nick of time */
  81         if (!phy->suspended) {
  82                 dev_info(&phy->phy->dev, "resume timeout cancelled\n");
  83                 return;
  84         }
  85
  86         phy->error = 0;
  87         phy->suspended = 0;
  88         sas_deform_port(phy, 1);
  89 }
  90
  91
  92 static void sas_phye_shutdown(struct work_struct *work)
  93 {
  94         struct asd_sas_event *ev = to_asd_sas_event(work);
  95         struct asd_sas_phy *phy = ev->phy;
  96         struct sas_ha_struct *sas_ha = phy->ha;
  97         struct sas_internal *i =
  98                 to_sas_internal(sas_ha->shost->transportt);
  99
 100         if (phy->enabled) {
 101                 int ret;
 102
 103                 phy->error = 0;
 104                 phy->enabled = 0;
 105                 ret = i->dft->lldd_control_phy(phy, PHY_FUNC_DISABLE, NULL);
 106                 if (ret)
 107                         pr_notice("lldd disable phy%d returned %d\n", phy->id,
 108                                   ret);
 109         } else
 110                 pr_notice("phy%d is not enabled, cannot shutdown\n", phy->id);
 111         phy->in_shutdown = 0;
 112 }
 113
 114 /* ---------- Phy class registration ---------- */
 115
 116 int sas_register_phys(struct sas_ha_struct *sas_ha)
 117 {
 118         int i;
 119
 120         /* Now register the phys. */
 121         for (i = 0; i < sas_ha->num_phys; i++) {
 122                 struct asd_sas_phy *phy = sas_ha->sas_phy[i];
 123
 124                 phy->error = 0;
 125                 atomic_set(&phy->event_nr, 0);
 126                 INIT_LIST_HEAD(&phy->port_phy_el);
 127
 128                 phy->port = NULL;
 129                 phy->ha = sas_ha;
 130                 spin_lock_init(&phy->frame_rcvd_lock);
 131                 spin_lock_init(&phy->sas_prim_lock);
 132                 phy->frame_rcvd_size = 0;
 133
 134                 phy->phy = sas_phy_alloc(&sas_ha->shost->shost_gendev, i);
 135                 if (!phy->phy)
 136                         return -ENOMEM;
 137
 138                 phy->phy->identify.initiator_port_protocols =
 139                         phy->iproto;
 140                 phy->phy->identify.target_port_protocols = phy->tproto;
 141                 phy->phy->identify.sas_address = SAS_ADDR(sas_ha->sas_addr);
 142                 phy->phy->identify.phy_identifier = i;
 143                 phy->phy->minimum_linkrate_hw = SAS_LINK_RATE_UNKNOWN;
 144                 phy->phy->maximum_linkrate_hw = SAS_LINK_RATE_UNKNOWN;
 145                 phy->phy->minimum_linkrate = SAS_LINK_RATE_UNKNOWN;
 146                 phy->phy->maximum_linkrate = SAS_LINK_RATE_UNKNOWN;
 147                 phy->phy->negotiated_linkrate = SAS_LINK_RATE_UNKNOWN;
 148
 149                 sas_phy_add(phy->phy);
 150         }
 151
 152         return 0;
 153 }
 154
 155 const work_func_t sas_phy_event_fns[PHY_NUM_EVENTS] = {
 156         [PHYE_LOSS_OF_SIGNAL] = sas_phye_loss_of_signal,
 157         [PHYE_OOB_DONE] = sas_phye_oob_done,
 158         [PHYE_OOB_ERROR] = sas_phye_oob_error,
 159         [PHYE_SPINUP_HOLD] = sas_phye_spinup_hold,
 160         [PHYE_RESUME_TIMEOUT] = sas_phye_resume_timeout,
 161         [PHYE_SHUTDOWN] = sas_phye_shutdown,
 162 };