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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  52  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  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 #define PF_NOTIFY (1 << 0)
  67 #define PF_RESUME (1 << 1)
  68
  69 struct isci_phy;
  70 struct isci_host;
  71
  72 enum isci_status {
  73         isci_freed        = 0x00,
  74         isci_starting     = 0x01,
  75         isci_ready        = 0x02,
  76         isci_ready_for_io = 0x03,
  77         isci_stopping     = 0x04,
  78         isci_stopped      = 0x05,
  79 };
  80
  81 /**
  82  * struct isci_port - isci direct attached sas port object
  83  * @ready_exit: several states constitute 'ready'. When exiting ready we
  84  *              need to take extra port-teardown actions that are
  85  *              skipped when exiting to another 'ready' state.
  86  * @logical_port_index: software port index
  87  * @physical_port_index: hardware port index
  88  * @active_phy_mask: identifies phy members
  89  * @enabled_phy_mask: phy mask for the port
  90  *                    that are already part of the port
  91  * @reserved_tag:
  92  * @reserved_rni: reserver for port task scheduler workaround
  93  * @started_request_count: reference count for outstanding commands
  94  * @not_ready_reason: set during state transitions and notified
  95  * @timer: timeout start/stop operations
  96  */
  97 struct isci_port {
  98         struct isci_host *isci_host;
  99         struct list_head remote_dev_list;
 100         #define IPORT_RESET_PENDING 0
 101         unsigned long state;
 102         enum sci_status hard_reset_status;
 103         struct sci_base_state_machine sm;
 104         bool ready_exit;
 105         u8 logical_port_index;
 106         u8 physical_port_index;
 107         u8 active_phy_mask;
 108         u8 enabled_phy_mask;
 109         u8 last_active_phy;
 110         u16 reserved_rni;
 111         u16 reserved_tag;
 112         u32 started_request_count;
 113         u32 assigned_device_count;
 114         u32 hang_detect_users;
 115         u32 not_ready_reason;
 116         struct isci_phy *phy_table[SCI_MAX_PHYS];
 117         struct isci_host *owning_controller;
 118         struct sci_timer timer;
 119         struct scu_port_task_scheduler_registers __iomem *port_task_scheduler_registers;
 120         /* XXX rework: only one register, no need to replicate per-port */
 121         u32 __iomem *port_pe_configuration_register;
 122         struct scu_viit_entry __iomem *viit_registers;
 123 };
 124
 125 enum sci_port_not_ready_reason_code {
 126         SCIC_PORT_NOT_READY_NO_ACTIVE_PHYS,
 127         SCIC_PORT_NOT_READY_HARD_RESET_REQUESTED,
 128         SCIC_PORT_NOT_READY_INVALID_PORT_CONFIGURATION,
 129         SCIC_PORT_NOT_READY_RECONFIGURING,
 130
 131         SCIC_PORT_NOT_READY_REASON_CODE_MAX
 132 };
 133
 134 struct sci_port_end_point_properties {
 135         struct sci_sas_address sas_address;
 136         struct sci_phy_proto protocols;
 137 };
 138
 139 struct sci_port_properties {
 140         u32 index;
 141         struct sci_port_end_point_properties local;
 142         struct sci_port_end_point_properties remote;
 143         u32 phy_mask;
 144 };
 145
 146 /**
 147  * enum sci_port_states - port state machine states
 148  * @SCI_PORT_STOPPED: port has successfully been stopped.  In this state
 149  *                    no new IO operations are permitted.  This state is
 150  *                    entered from the STOPPING state.
 151  * @SCI_PORT_STOPPING: port is in the process of stopping.  In this
 152  *                     state no new IO operations are permitted, but
 153  *                     existing IO operations are allowed to complete.
 154  *                     This state is entered from the READY state.
 155  * @SCI_PORT_READY: port is now ready.  Thus, the user is able to
 156  *                  perform IO operations on this port. This state is
 157  *                  entered from the STARTING state.
 158  * @SCI_PORT_SUB_WAITING: port is started and ready but has no active
 159  *                        phys.
 160  * @SCI_PORT_SUB_OPERATIONAL: port is started and ready and there is at
 161  *                            least one phy operational.
 162  * @SCI_PORT_SUB_CONFIGURING: port is started and there was an
 163  *                            add/remove phy event.  This state is only
 164  *                            used in Automatic Port Configuration Mode
 165  *                            (APC)
 166  * @SCI_PORT_RESETTING: port is in the process of performing a hard
 167  *                      reset.  Thus, the user is unable to perform IO
 168  *                      operations on this port.  This state is entered
 169  *                      from the READY state.
 170  * @SCI_PORT_FAILED: port has failed a reset request.  This state is
 171  *                   entered when a port reset request times out. This
 172  *                   state is entered from the RESETTING state.
 173  */
 174 #define PORT_STATES {\
 175         C(PORT_STOPPED),\
 176         C(PORT_STOPPING),\
 177         C(PORT_READY),\
 178         C(PORT_SUB_WAITING),\
 179         C(PORT_SUB_OPERATIONAL),\
 180         C(PORT_SUB_CONFIGURING),\
 181         C(PORT_RESETTING),\
 182         C(PORT_FAILED),\
 183         }
 184 #undef C
 185 #define C(a) SCI_##a
 186 enum sci_port_states PORT_STATES;
 187 #undef C
 188
 189 static inline void sci_port_decrement_request_count(struct isci_port *iport)
 190 {
 191         if (WARN_ONCE(iport->started_request_count == 0,
 192                        "%s: tried to decrement started_request_count past 0!?",
 193                         __func__))
 194                 /* pass */;
 195         else
 196                 iport->started_request_count--;
 197 }
 198
 199 #define sci_port_active_phy(port, phy) \
 200         (((port)->active_phy_mask & (1 << (phy)->phy_index)) != 0)
 201
 202 void sci_port_construct(
 203         struct isci_port *iport,
 204         u8 port_index,
 205         struct isci_host *ihost);
 206
 207 enum sci_status sci_port_start(struct isci_port *iport);
 208 enum sci_status sci_port_stop(struct isci_port *iport);
 209
 210 enum sci_status sci_port_add_phy(
 211         struct isci_port *iport,
 212         struct isci_phy *iphy);
 213
 214 enum sci_status sci_port_remove_phy(
 215         struct isci_port *iport,
 216         struct isci_phy *iphy);
 217
 218 void sci_port_setup_transports(
 219         struct isci_port *iport,
 220         u32 device_id);
 221
 222 void isci_port_bcn_enable(struct isci_host *, struct isci_port *);
 223
 224 void sci_port_deactivate_phy(
 225         struct isci_port *iport,
 226         struct isci_phy *iphy,
 227         bool do_notify_user);
 228
 229 bool sci_port_link_detected(
 230         struct isci_port *iport,
 231         struct isci_phy *iphy);
 232
 233 enum sci_status sci_port_get_properties(
 234         struct isci_port *iport,
 235         struct sci_port_properties *prop);
 236
 237 enum sci_status sci_port_link_up(struct isci_port *iport,
 238                                       struct isci_phy *iphy);
 239 enum sci_status sci_port_link_down(struct isci_port *iport,
 240                                         struct isci_phy *iphy);
 241
 242 struct isci_request;
 243 struct isci_remote_device;
 244 enum sci_status sci_port_start_io(
 245         struct isci_port *iport,
 246         struct isci_remote_device *idev,
 247         struct isci_request *ireq);
 248
 249 enum sci_status sci_port_complete_io(
 250         struct isci_port *iport,
 251         struct isci_remote_device *idev,
 252         struct isci_request *ireq);
 253
 254 enum sas_linkrate sci_port_get_max_allowed_speed(
 255         struct isci_port *iport);
 256
 257 void sci_port_broadcast_change_received(
 258         struct isci_port *iport,
 259         struct isci_phy *iphy);
 260
 261 bool sci_port_is_valid_phy_assignment(
 262         struct isci_port *iport,
 263         u32 phy_index);
 264
 265 void sci_port_get_sas_address(
 266         struct isci_port *iport,
 267         struct sci_sas_address *sas_address);
 268
 269 void sci_port_get_attached_sas_address(
 270         struct isci_port *iport,
 271         struct sci_sas_address *sas_address);
 272
 273 void sci_port_set_hang_detection_timeout(
 274         struct isci_port *isci_port,
 275         u32 timeout);
 276
 277 void isci_port_formed(struct asd_sas_phy *);
 278 void isci_port_deformed(struct asd_sas_phy *);
 279
 280 int isci_port_perform_hard_reset(struct isci_host *ihost, struct isci_port *iport,
 281                                  struct isci_phy *iphy);
 282 int isci_ata_check_ready(struct domain_device *dev);
 283 #endif /* !defined(_ISCI_PORT_H_) */