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