LXR linux/drivers/scsi/libsas/sas

   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
  17static 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
  26static 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
  34static 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->core.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
  63static 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->core.shost->transportt);
  70
  71        phy->error = 0;
  72        i->dft->lldd_control_phy(phy, PHY_FUNC_RELEASE_SPINUP_HOLD, NULL);
  73}
  74
  75static 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
  92static 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->core.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
 116int 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->core.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
 155const 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};
 163