drivers/scsi/isci/host.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
  51  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  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 #ifndef _SCI_HOST_H_
  56 #define _SCI_HOST_H_
  57
  58 #include "remote_device.h"
  59 #include "phy.h"
  60 #include "isci.h"
  61 #include "remote_node_table.h"
  62 #include "registers.h"
  63 #include "unsolicited_frame_control.h"
  64 #include "probe_roms.h"
  65
  66 struct isci_request;
  67 struct scu_task_context;
  68
  69
  70 /**
  71  * struct sci_power_control -
  72  *
  73  * This structure defines the fields for managing power control for direct
  74  * attached disk devices.
  75  */
  76 struct sci_power_control {
  77         /**
  78          * This field is set when the power control timer is running and cleared when
  79          * it is not.
  80          */
  81         bool timer_started;
  82
  83         /**
  84          * Timer to control when the directed attached disks can consume power.
  85          */
  86         struct sci_timer timer;
  87
  88         /**
  89          * This field is used to keep track of how many phys are put into the
  90          * requesters field.
  91          */
  92         u8 phys_waiting;
  93
  94         /**
  95          * This field is used to keep track of how many phys have been granted to consume power
  96          */
  97         u8 phys_granted_power;
  98
  99         /**
 100          * This field is an array of phys that we are waiting on. The phys are direct
 101          * mapped into requesters via struct sci_phy.phy_index
 102          */
 103         struct isci_phy *requesters[SCI_MAX_PHYS];
 104
 105 };
 106
 107 struct sci_port_configuration_agent;
 108 typedef void (*port_config_fn)(struct isci_host *,
 109                                struct sci_port_configuration_agent *,
 110                                struct isci_port *, struct isci_phy *);
 111
 112 struct sci_port_configuration_agent {
 113         u16 phy_configured_mask;
 114         u16 phy_ready_mask;
 115         struct {
 116                 u8 min_index;
 117                 u8 max_index;
 118         } phy_valid_port_range[SCI_MAX_PHYS];
 119         bool timer_pending;
 120         port_config_fn link_up_handler;
 121         port_config_fn link_down_handler;
 122         struct sci_timer        timer;
 123 };
 124
 125 /**
 126  * isci_host - primary host/controller object
 127  * @timer: timeout start/stop operations
 128  * @device_table: rni (hw remote node index) to remote device lookup table
 129  * @available_remote_nodes: rni allocator
 130  * @power_control: manage device spin up
 131  * @io_request_sequence: generation number for tci's (task contexts)
 132  * @task_context_table: hw task context table
 133  * @remote_node_context_table: hw remote node context table
 134  * @completion_queue: hw-producer driver-consumer communication ring
 135  * @completion_queue_get: tracks the driver 'head' of the ring to notify hw
 136  * @logical_port_entries: min({driver|silicon}-supported-port-count)
 137  * @remote_node_entries: min({driver|silicon}-supported-node-count)
 138  * @task_context_entries: min({driver|silicon}-supported-task-count)
 139  * @phy_timer: phy startup timer
 140  * @invalid_phy_mask: if an invalid_link_up notification is reported a bit for
 141  *                    the phy index is set so further notifications are not
 142  *                    made.  Once the phy reports link up and is made part of a
 143  *                    port then this bit is cleared.
 144
 145  */
 146 struct isci_host {
 147         struct sci_base_state_machine sm;
 148         /* XXX can we time this externally */
 149         struct sci_timer timer;
 150         /* XXX drop reference module params directly */
 151         struct sci_user_parameters user_parameters;
 152         /* XXX no need to be a union */
 153         struct sci_oem_params oem_parameters;
 154         struct sci_port_configuration_agent port_agent;
 155         struct isci_remote_device *device_table[SCI_MAX_REMOTE_DEVICES];
 156         struct sci_remote_node_table available_remote_nodes;
 157         struct sci_power_control power_control;
 158         u8 io_request_sequence[SCI_MAX_IO_REQUESTS];
 159         struct scu_task_context *task_context_table;
 160         dma_addr_t task_context_dma;
 161         union scu_remote_node_context *remote_node_context_table;
 162         u32 *completion_queue;
 163         u32 completion_queue_get;
 164         u32 logical_port_entries;
 165         u32 remote_node_entries;
 166         u32 task_context_entries;
 167         struct sci_unsolicited_frame_control uf_control;
 168
 169         /* phy startup */
 170         struct sci_timer phy_timer;
 171         /* XXX kill */
 172         bool phy_startup_timer_pending;
 173         u32 next_phy_to_start;
 174         /* XXX convert to unsigned long and use bitops */
 175         u8 invalid_phy_mask;
 176
 177         /* TODO attempt dynamic interrupt coalescing scheme */
 178         u16 interrupt_coalesce_number;
 179         u32 interrupt_coalesce_timeout;
 180         struct smu_registers __iomem *smu_registers;
 181         struct scu_registers __iomem *scu_registers;
 182
 183         u16 tci_head;
 184         u16 tci_tail;
 185         u16 tci_pool[SCI_MAX_IO_REQUESTS];
 186
 187         int id; /* unique within a given pci device */
 188         struct isci_phy phys[SCI_MAX_PHYS];
 189         struct isci_port ports[SCI_MAX_PORTS + 1]; /* includes dummy port */
 190         struct asd_sas_port sas_ports[SCI_MAX_PORTS];
 191         struct sas_ha_struct sas_ha;
 192
 193         spinlock_t state_lock;
 194         struct pci_dev *pdev;
 195         enum isci_status status;
 196         #define IHOST_START_PENDING 0
 197         #define IHOST_STOP_PENDING 1
 198         unsigned long flags;
 199         wait_queue_head_t eventq;
 200         struct Scsi_Host *shost;
 201         struct tasklet_struct completion_tasklet;
 202         struct list_head requests_to_complete;
 203         struct list_head requests_to_errorback;
 204         spinlock_t scic_lock;
 205         struct isci_request *reqs[SCI_MAX_IO_REQUESTS];
 206         struct isci_remote_device devices[SCI_MAX_REMOTE_DEVICES];
 207 };
 208
 209 /**
 210  * enum sci_controller_states - This enumeration depicts all the states
 211  *    for the common controller state machine.
 212  */
 213 enum sci_controller_states {
 214         /**
 215          * Simply the initial state for the base controller state machine.
 216          */
 217         SCIC_INITIAL = 0,
 218
 219         /**
 220          * This state indicates that the controller is reset.  The memory for
 221          * the controller is in it's initial state, but the controller requires
 222          * initialization.
 223          * This state is entered from the INITIAL state.
 224          * This state is entered from the RESETTING state.
 225          */
 226         SCIC_RESET,
 227
 228         /**
 229          * This state is typically an action state that indicates the controller
 230          * is in the process of initialization.  In this state no new IO operations
 231          * are permitted.
 232          * This state is entered from the RESET state.
 233          */
 234         SCIC_INITIALIZING,
 235
 236         /**
 237          * This state indicates that the controller has been successfully
 238          * initialized.  In this state no new IO operations are permitted.
 239          * This state is entered from the INITIALIZING state.
 240          */
 241         SCIC_INITIALIZED,
 242
 243         /**
 244          * This state indicates the the controller is in the process of becoming
 245          * ready (i.e. starting).  In this state no new IO operations are permitted.
 246          * This state is entered from the INITIALIZED state.
 247          */
 248         SCIC_STARTING,
 249
 250         /**
 251          * This state indicates the controller is now ready.  Thus, the user
 252          * is able to perform IO operations on the controller.
 253          * This state is entered from the STARTING state.
 254          */
 255         SCIC_READY,
 256
 257         /**
 258          * This state is typically an action state that indicates the controller
 259          * is in the process of resetting.  Thus, the user is unable to perform
 260          * IO operations on the controller.  A reset is considered destructive in
 261          * most cases.
 262          * This state is entered from the READY state.
 263          * This state is entered from the FAILED state.
 264          * This state is entered from the STOPPED state.
 265          */
 266         SCIC_RESETTING,
 267
 268         /**
 269          * This state indicates that the controller is in the process of stopping.
 270          * In this state no new IO operations are permitted, but existing IO
 271          * operations are allowed to complete.
 272          * This state is entered from the READY state.
 273          */
 274         SCIC_STOPPING,
 275
 276         /**
 277          * This state indicates that the controller has successfully been stopped.
 278          * In this state no new IO operations are permitted.
 279          * This state is entered from the STOPPING state.
 280          */
 281         SCIC_STOPPED,
 282
 283         /**
 284          * This state indicates that the controller could not successfully be
 285          * initialized.  In this state no new IO operations are permitted.
 286          * This state is entered from the INITIALIZING state.
 287          * This state is entered from the STARTING state.
 288          * This state is entered from the STOPPING state.
 289          * This state is entered from the RESETTING state.
 290          */
 291         SCIC_FAILED,
 292 };
 293
 294 /**
 295  * struct isci_pci_info - This class represents the pci function containing the
 296  *    controllers. Depending on PCI SKU, there could be up to 2 controllers in
 297  *    the PCI function.
 298  */
 299 #define SCI_MAX_MSIX_INT (SCI_NUM_MSI_X_INT*SCI_MAX_CONTROLLERS)
 300
 301 struct isci_pci_info {
 302         struct msix_entry msix_entries[SCI_MAX_MSIX_INT];
 303         struct isci_host *hosts[SCI_MAX_CONTROLLERS];
 304         struct isci_orom *orom;
 305 };
 306
 307 static inline struct isci_pci_info *to_pci_info(struct pci_dev *pdev)
 308 {
 309         return pci_get_drvdata(pdev);
 310 }
 311
 312 #define for_each_isci_host(id, ihost, pdev) \
 313         for (id = 0, ihost = to_pci_info(pdev)->hosts[id]; \
 314              id < ARRAY_SIZE(to_pci_info(pdev)->hosts) && ihost; \
 315              ihost = to_pci_info(pdev)->hosts[++id])
 316
 317 static inline enum isci_status isci_host_get_state(struct isci_host *isci_host)
 318 {
 319         return isci_host->status;
 320 }
 321
 322 static inline void isci_host_change_state(struct isci_host *isci_host,
 323                                           enum isci_status status)
 324 {
 325         unsigned long flags;
 326
 327         dev_dbg(&isci_host->pdev->dev,
 328                 "%s: isci_host = %p, state = 0x%x",
 329                 __func__,
 330                 isci_host,
 331                 status);
 332         spin_lock_irqsave(&isci_host->state_lock, flags);
 333         isci_host->status = status;
 334         spin_unlock_irqrestore(&isci_host->state_lock, flags);
 335
 336 }
 337
 338 static inline void wait_for_start(struct isci_host *ihost)
 339 {
 340         wait_event(ihost->eventq, !test_bit(IHOST_START_PENDING, &ihost->flags));
 341 }
 342
 343 static inline void wait_for_stop(struct isci_host *ihost)
 344 {
 345         wait_event(ihost->eventq, !test_bit(IHOST_STOP_PENDING, &ihost->flags));
 346 }
 347
 348 static inline void wait_for_device_start(struct isci_host *ihost, struct isci_remote_device *idev)
 349 {
 350         wait_event(ihost->eventq, !test_bit(IDEV_START_PENDING, &idev->flags));
 351 }
 352
 353 static inline void wait_for_device_stop(struct isci_host *ihost, struct isci_remote_device *idev)
 354 {
 355         wait_event(ihost->eventq, !test_bit(IDEV_STOP_PENDING, &idev->flags));
 356 }
 357
 358 static inline struct isci_host *dev_to_ihost(struct domain_device *dev)
 359 {
 360         return dev->port->ha->lldd_ha;
 361 }
 362
 363 /* we always use protocol engine group zero */
 364 #define ISCI_PEG 0
 365
 366 /* see sci_controller_io_tag_allocate|free for how seq and tci are built */
 367 #define ISCI_TAG(seq, tci) (((u16) (seq)) << 12 | tci)
 368
 369 /* these are returned by the hardware, so sanitize them */
 370 #define ISCI_TAG_SEQ(tag) (((tag) >> 12) & (SCI_MAX_SEQ-1))
 371 #define ISCI_TAG_TCI(tag) ((tag) & (SCI_MAX_IO_REQUESTS-1))
 372
 373 /* interrupt coalescing baseline: 9 == 3 to 5us interrupt delay per command */
 374 #define ISCI_COALESCE_BASE 9
 375
 376 /* expander attached sata devices require 3 rnc slots */
 377 static inline int sci_remote_device_node_count(struct isci_remote_device *idev)
 378 {
 379         struct domain_device *dev = idev->domain_dev;
 380
 381         if ((dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) &&
 382             !idev->is_direct_attached)
 383                 return SCU_STP_REMOTE_NODE_COUNT;
 384         return SCU_SSP_REMOTE_NODE_COUNT;
 385 }
 386
 387 /**
 388  * sci_controller_clear_invalid_phy() -
 389  *
 390  * This macro will clear the bit in the invalid phy mask for this controller
 391  * object.  This is used to control messages reported for invalid link up
 392  * notifications.
 393  */
 394 #define sci_controller_clear_invalid_phy(controller, phy) \
 395         ((controller)->invalid_phy_mask &= ~(1 << (phy)->phy_index))
 396
 397 static inline struct device *scirdev_to_dev(struct isci_remote_device *idev)
 398 {
 399         if (!idev || !idev->isci_port || !idev->isci_port->isci_host)
 400                 return NULL;
 401
 402         return &idev->isci_port->isci_host->pdev->dev;
 403 }
 404
 405 static inline bool is_a2(struct pci_dev *pdev)
 406 {
 407         if (pdev->revision < 4)
 408                 return true;
 409         return false;
 410 }
 411
 412 static inline bool is_b0(struct pci_dev *pdev)
 413 {
 414         if (pdev->revision == 4)
 415                 return true;
 416         return false;
 417 }
 418
 419 static inline bool is_c0(struct pci_dev *pdev)
 420 {
 421         if (pdev->revision == 5)
 422                 return true;
 423         return false;
 424 }
 425
 426 static inline bool is_c1(struct pci_dev *pdev)
 427 {
 428         if (pdev->revision >= 6)
 429                 return true;
 430         return false;
 431 }
 432
 433 enum cable_selections {
 434         short_cable     = 0,
 435         long_cable      = 1,
 436         medium_cable    = 2,
 437         undefined_cable = 3
 438 };
 439
 440 #define CABLE_OVERRIDE_DISABLED (0x10000)
 441
 442 static inline int is_cable_select_overridden(void)
 443 {
 444         return cable_selection_override < CABLE_OVERRIDE_DISABLED;
 445 }
 446
 447 enum cable_selections decode_cable_selection(struct isci_host *ihost, int phy);
 448 void validate_cable_selections(struct isci_host *ihost);
 449 char *lookup_cable_names(enum cable_selections);
 450
 451 /* set hw control for 'activity', even though active enclosures seem to drive
 452  * the activity led on their own.  Skip setting FSENG control on 'status' due
 453  * to unexpected operation and 'error' due to not being a supported automatic
 454  * FSENG output
 455  */
 456 #define SGPIO_HW_CONTROL 0x00000443
 457
 458 static inline int isci_gpio_count(struct isci_host *ihost)
 459 {
 460         return ARRAY_SIZE(ihost->scu_registers->peg0.sgpio.output_data_select);
 461 }
 462
 463 void sci_controller_post_request(struct isci_host *ihost,
 464                                       u32 request);
 465 void sci_controller_release_frame(struct isci_host *ihost,
 466                                        u32 frame_index);
 467 void sci_controller_copy_sata_response(void *response_buffer,
 468                                             void *frame_header,
 469                                             void *frame_buffer);
 470 enum sci_status sci_controller_allocate_remote_node_context(struct isci_host *ihost,
 471                                                                  struct isci_remote_device *idev,
 472                                                                  u16 *node_id);
 473 void sci_controller_free_remote_node_context(
 474         struct isci_host *ihost,
 475         struct isci_remote_device *idev,
 476         u16 node_id);
 477
 478 struct isci_request *sci_request_by_tag(struct isci_host *ihost,
 479                                              u16 io_tag);
 480
 481 void sci_controller_power_control_queue_insert(
 482         struct isci_host *ihost,
 483         struct isci_phy *iphy);
 484
 485 void sci_controller_power_control_queue_remove(
 486         struct isci_host *ihost,
 487         struct isci_phy *iphy);
 488
 489 void sci_controller_link_up(
 490         struct isci_host *ihost,
 491         struct isci_port *iport,
 492         struct isci_phy *iphy);
 493
 494 void sci_controller_link_down(
 495         struct isci_host *ihost,
 496         struct isci_port *iport,
 497         struct isci_phy *iphy);
 498
 499 void sci_controller_remote_device_stopped(
 500         struct isci_host *ihost,
 501         struct isci_remote_device *idev);
 502
 503 void sci_controller_copy_task_context(
 504         struct isci_host *ihost,
 505         struct isci_request *ireq);
 506
 507 void sci_controller_register_setup(struct isci_host *ihost);
 508
 509 enum sci_status sci_controller_continue_io(struct isci_request *ireq);
 510 int isci_host_scan_finished(struct Scsi_Host *, unsigned long);
 511 void isci_host_scan_start(struct Scsi_Host *);
 512 u16 isci_alloc_tag(struct isci_host *ihost);
 513 enum sci_status isci_free_tag(struct isci_host *ihost, u16 io_tag);
 514 void isci_tci_free(struct isci_host *ihost, u16 tci);
 515
 516 int isci_host_init(struct isci_host *);
 517
 518 void isci_host_init_controller_names(
 519         struct isci_host *isci_host,
 520         unsigned int controller_idx);
 521
 522 void isci_host_deinit(
 523         struct isci_host *);
 524
 525 void isci_host_port_link_up(
 526         struct isci_host *,
 527         struct isci_port *,
 528         struct isci_phy *);
 529 int isci_host_dev_found(struct domain_device *);
 530
 531 void isci_host_remote_device_start_complete(
 532         struct isci_host *,
 533         struct isci_remote_device *,
 534         enum sci_status);
 535
 536 void sci_controller_disable_interrupts(
 537         struct isci_host *ihost);
 538
 539 enum sci_status sci_controller_start_io(
 540         struct isci_host *ihost,
 541         struct isci_remote_device *idev,
 542         struct isci_request *ireq);
 543
 544 enum sci_task_status sci_controller_start_task(
 545         struct isci_host *ihost,
 546         struct isci_remote_device *idev,
 547         struct isci_request *ireq);
 548
 549 enum sci_status sci_controller_terminate_request(
 550         struct isci_host *ihost,
 551         struct isci_remote_device *idev,
 552         struct isci_request *ireq);
 553
 554 enum sci_status sci_controller_complete_io(
 555         struct isci_host *ihost,
 556         struct isci_remote_device *idev,
 557         struct isci_request *ireq);
 558
 559 void sci_port_configuration_agent_construct(
 560         struct sci_port_configuration_agent *port_agent);
 561
 562 enum sci_status sci_port_configuration_agent_initialize(
 563         struct isci_host *ihost,
 564         struct sci_port_configuration_agent *port_agent);
 565
 566 int isci_gpio_write(struct sas_ha_struct *, u8 reg_type, u8 reg_index,
 567                     u8 reg_count, u8 *write_data);
 568 #endif