drivers/scsi/isci/port.h

   1 /*
   2  * This file is provided under a dual BSD/GPLv2 license.  When using or
   3  * redistributing this file, you may do so under either license.
   4  *
   5  * GPL LICENSE SUMMARY
   6  *
   7  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of version 2 of the GNU General Public License as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called LICENSE.GPL.
  23  *
  24  * BSD LICENSE
  25  *
  26  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
  27  * All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  *
  33  *   * Redistributions of source code must retain the above copyright
  34  *     notice, this list of conditions and the following disclaimer.
  35  *   * Redistributions in binary form must reproduce the above copyright
  36  *     notice, this list of conditions and the following disclaimer in
  37  *     the documentation and/or other materials provided with the
  38  *     distribution.
  39  *   * Neither the name of Intel Corporation nor the names of its
  40  *     contributors may be used to endorse or promote products derived
  41  *     from this software without specific prior written permission.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  44  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  45  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  46  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  47  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  48  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  49  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  50  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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  53  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  54  */
  55
  56 #ifndef _ISCI_PORT_H_
  57 #define _ISCI_PORT_H_
  58
  59 #include <scsi/libsas.h>
  60 #include "isci.h"
  61 #include "sas.h"
  62 #include "phy.h"
  63
  64 #define SCIC_SDS_DUMMY_PORT   0xFF
  65
  66 struct isci_phy;
  67 struct isci_host;
  68
  69 enum isci_status {
  70         isci_freed        = 0x00,
  71         isci_starting     = 0x01,
  72         isci_ready        = 0x02,
  73         isci_ready_for_io = 0x03,
  74         isci_stopping     = 0x04,
  75         isci_stopped      = 0x05,
  76 };
  77
  78 /**
  79  * struct isci_port - isci direct attached sas port object
  80  * @ready_exit: several states constitute 'ready'. When exiting ready we
  81  *              need to take extra port-teardown actions that are
  82  *              skipped when exiting to another 'ready' state.
  83  * @logical_port_index: software port index
  84  * @physical_port_index: hardware port index
  85  * @active_phy_mask: identifies phy members
  86  * @reserved_tag:
  87  * @reserved_rni: reserver for port task scheduler workaround
  88  * @started_request_count: reference count for outstanding commands
  89  * @not_ready_reason: set during state transitions and notified
  90  * @timer: timeout start/stop operations
  91  */
  92 struct isci_port {
  93         enum isci_status status;
  94         struct isci_host *isci_host;
  95         struct asd_sas_port sas_port;
  96         struct list_head remote_dev_list;
  97         spinlock_t state_lock;
  98         struct list_head domain_dev_list;
  99         struct completion start_complete;
 100         struct completion hard_reset_complete;
 101         enum sci_status hard_reset_status;
 102         struct sci_base_state_machine sm;
 103         bool ready_exit;
 104         u8 logical_port_index;
 105         u8 physical_port_index;
 106         u8 active_phy_mask;
 107         u8 last_active_phy;
 108         u16 reserved_rni;
 109         u16 reserved_tag;
 110         u32 started_request_count;
 111         u32 assigned_device_count;
 112         u32 not_ready_reason;
 113         struct isci_phy *phy_table[SCI_MAX_PHYS];
 114         struct isci_host *owning_controller;
 115         struct sci_timer timer;
 116         struct scu_port_task_scheduler_registers __iomem *port_task_scheduler_registers;
 117         /* XXX rework: only one register, no need to replicate per-port */
 118         u32 __iomem *port_pe_configuration_register;
 119         struct scu_viit_entry __iomem *viit_registers;
 120 };
 121
 122 enum sci_port_not_ready_reason_code {
 123         SCIC_PORT_NOT_READY_NO_ACTIVE_PHYS,
 124         SCIC_PORT_NOT_READY_HARD_RESET_REQUESTED,
 125         SCIC_PORT_NOT_READY_INVALID_PORT_CONFIGURATION,
 126         SCIC_PORT_NOT_READY_RECONFIGURING,
 127
 128         SCIC_PORT_NOT_READY_REASON_CODE_MAX
 129 };
 130
 131 struct sci_port_end_point_properties {
 132         struct sci_sas_address sas_address;
 133         struct sci_phy_proto protocols;
 134 };
 135
 136 struct sci_port_properties {
 137         u32 index;
 138         struct sci_port_end_point_properties local;
 139         struct sci_port_end_point_properties remote;
 140         u32 phy_mask;
 141 };
 142
 143 /**
 144  * enum sci_port_states - This enumeration depicts all the states for the
 145  *    common port state machine.
 146  *
 147  *
 148  */
 149 enum sci_port_states {
 150         /**
 151          * This state indicates that the port has successfully been stopped.
 152          * In this state no new IO operations are permitted.
 153          * This state is entered from the STOPPING state.
 154          */
 155         SCI_PORT_STOPPED,
 156
 157         /**
 158          * This state indicates that the port is in the process of stopping.
 159          * In this state no new IO operations are permitted, but existing IO
 160          * operations are allowed to complete.
 161          * This state is entered from the READY state.
 162          */
 163         SCI_PORT_STOPPING,
 164
 165         /**
 166          * This state indicates the port is now ready.  Thus, the user is
 167          * able to perform IO operations on this port.
 168          * This state is entered from the STARTING state.
 169          */
 170         SCI_PORT_READY,
 171
 172         /**
 173          * The substate where the port is started and ready but has no
 174          * active phys.
 175          */
 176         SCI_PORT_SUB_WAITING,
 177
 178         /**
 179          * The substate where the port is started and ready and there is
 180          * at least one phy operational.
 181          */
 182         SCI_PORT_SUB_OPERATIONAL,
 183
 184         /**
 185          * The substate where the port is started and there was an
 186          * add/remove phy event.  This state is only used in Automatic
 187          * Port Configuration Mode (APC)
 188          */
 189         SCI_PORT_SUB_CONFIGURING,
 190
 191         /**
 192          * This state indicates the port is in the process of performing a hard
 193          * reset.  Thus, the user is unable to perform IO operations on this
 194          * port.
 195          * This state is entered from the READY state.
 196          */
 197         SCI_PORT_RESETTING,
 198
 199         /**
 200          * This state indicates the port has failed a reset request.  This state
 201          * is entered when a port reset request times out.
 202          * This state is entered from the RESETTING state.
 203          */
 204         SCI_PORT_FAILED,
 205
 206
 207 };
 208
 209 static inline void sci_port_decrement_request_count(struct isci_port *iport)
 210 {
 211         if (WARN_ONCE(iport->started_request_count == 0,
 212                        "%s: tried to decrement started_request_count past 0!?",
 213                         __func__))
 214                 /* pass */;
 215         else
 216                 iport->started_request_count--;
 217 }
 218
 219 #define sci_port_active_phy(port, phy) \
 220         (((port)->active_phy_mask & (1 << (phy)->phy_index)) != 0)
 221
 222 void sci_port_construct(
 223         struct isci_port *iport,
 224         u8 port_index,
 225         struct isci_host *ihost);
 226
 227 enum sci_status sci_port_start(struct isci_port *iport);
 228 enum sci_status sci_port_stop(struct isci_port *iport);
 229
 230 enum sci_status sci_port_add_phy(
 231         struct isci_port *iport,
 232         struct isci_phy *iphy);
 233
 234 enum sci_status sci_port_remove_phy(
 235         struct isci_port *iport,
 236         struct isci_phy *iphy);
 237
 238 void sci_port_setup_transports(
 239         struct isci_port *iport,
 240         u32 device_id);
 241
 242 void isci_port_bcn_enable(struct isci_host *, struct isci_port *);
 243
 244 void sci_port_deactivate_phy(
 245         struct isci_port *iport,
 246         struct isci_phy *iphy,
 247         bool do_notify_user);
 248
 249 bool sci_port_link_detected(
 250         struct isci_port *iport,
 251         struct isci_phy *iphy);
 252
 253 enum sci_status sci_port_link_up(struct isci_port *iport,
 254                                       struct isci_phy *iphy);
 255 enum sci_status sci_port_link_down(struct isci_port *iport,
 256                                         struct isci_phy *iphy);
 257
 258 struct isci_request;
 259 struct isci_remote_device;
 260 enum sci_status sci_port_start_io(
 261         struct isci_port *iport,
 262         struct isci_remote_device *idev,
 263         struct isci_request *ireq);
 264
 265 enum sci_status sci_port_complete_io(
 266         struct isci_port *iport,
 267         struct isci_remote_device *idev,
 268         struct isci_request *ireq);
 269
 270 enum sas_linkrate sci_port_get_max_allowed_speed(
 271         struct isci_port *iport);
 272
 273 void sci_port_broadcast_change_received(
 274         struct isci_port *iport,
 275         struct isci_phy *iphy);
 276
 277 bool sci_port_is_valid_phy_assignment(
 278         struct isci_port *iport,
 279         u32 phy_index);
 280
 281 void sci_port_get_sas_address(
 282         struct isci_port *iport,
 283         struct sci_sas_address *sas_address);
 284
 285 void sci_port_get_attached_sas_address(
 286         struct isci_port *iport,
 287         struct sci_sas_address *sas_address);
 288
 289 enum isci_status isci_port_get_state(
 290         struct isci_port *isci_port);
 291
 292 void isci_port_formed(struct asd_sas_phy *);
 293 void isci_port_deformed(struct asd_sas_phy *);
 294
 295 void isci_port_init(
 296         struct isci_port *port,
 297         struct isci_host *host,
 298         int index);
 299
 300 int isci_port_perform_hard_reset(struct isci_host *ihost, struct isci_port *iport,
 301                                  struct isci_phy *iphy);
 302 #endif /* !defined(_ISCI_PORT_H_) */