release/src-rt-6.x.4708/linux/linux-2.6.36/include/scsi/libsas.h

   1 /*
   2  * SAS host prototypes and structures header file
   3  *
   4  * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
   5  * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
   6  *
   7  * This file is licensed under GPLv2.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of the
  12  * License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22  * USA
  23  *
  24  */
  25
  26 #ifndef _LIBSAS_H_
  27 #define _LIBSAS_H_
  28
  29
  30 #include <linux/timer.h>
  31 #include <linux/pci.h>
  32 #include <scsi/sas.h>
  33 #include <linux/libata.h>
  34 #include <linux/list.h>
  35 #include <scsi/scsi_device.h>
  36 #include <scsi/scsi_cmnd.h>
  37 #include <scsi/scsi_transport_sas.h>
  38 #include <linux/scatterlist.h>
  39 #include <linux/slab.h>
  40
  41 struct block_device;
  42
  43 enum sas_class {
  44         SAS,
  45         EXPANDER
  46 };
  47
  48 enum sas_phy_role {
  49         PHY_ROLE_NONE = 0,
  50         PHY_ROLE_TARGET = 0x40,
  51         PHY_ROLE_INITIATOR = 0x80,
  52 };
  53
  54 enum sas_phy_type {
  55         PHY_TYPE_PHYSICAL,
  56         PHY_TYPE_VIRTUAL
  57 };
  58
  59 /* The events are mnemonically described in sas_dump.c
  60  * so when updating/adding events here, please also
  61  * update the other file too.
  62  */
  63 enum ha_event {
  64         HAE_RESET             = 0U,
  65         HA_NUM_EVENTS         = 1,
  66 };
  67
  68 enum port_event {
  69         PORTE_BYTES_DMAED     = 0U,
  70         PORTE_BROADCAST_RCVD  = 1,
  71         PORTE_LINK_RESET_ERR  = 2,
  72         PORTE_TIMER_EVENT     = 3,
  73         PORTE_HARD_RESET      = 4,
  74         PORT_NUM_EVENTS       = 5,
  75 };
  76
  77 enum phy_event {
  78         PHYE_LOSS_OF_SIGNAL   = 0U,
  79         PHYE_OOB_DONE         = 1,
  80         PHYE_OOB_ERROR        = 2,
  81         PHYE_SPINUP_HOLD      = 3, /* hot plug SATA, no COMWAKE sent */
  82         PHY_NUM_EVENTS        = 4,
  83 };
  84
  85 enum discover_event {
  86         DISCE_DISCOVER_DOMAIN   = 0U,
  87         DISCE_REVALIDATE_DOMAIN = 1,
  88         DISCE_PORT_GONE         = 2,
  89         DISC_NUM_EVENTS         = 3,
  90 };
  91
  92 /* ---------- Expander Devices ---------- */
  93
  94 #define to_dom_device(_obj) container_of(_obj, struct domain_device, dev_obj)
  95 #define to_dev_attr(_attr)  container_of(_attr, struct domain_dev_attribute,\
  96                                          attr)
  97
  98 enum routing_attribute {
  99         DIRECT_ROUTING,
 100         SUBTRACTIVE_ROUTING,
 101         TABLE_ROUTING,
 102 };
 103
 104 enum ex_phy_state {
 105         PHY_EMPTY,
 106         PHY_VACANT,
 107         PHY_NOT_PRESENT,
 108         PHY_DEVICE_DISCOVERED
 109 };
 110
 111 struct ex_phy {
 112         int    phy_id;
 113
 114         enum ex_phy_state phy_state;
 115
 116         enum sas_dev_type attached_dev_type;
 117         enum sas_linkrate linkrate;
 118
 119         u8   attached_sata_host:1;
 120         u8   attached_sata_dev:1;
 121         u8   attached_sata_ps:1;
 122
 123         enum sas_protocol attached_tproto;
 124         enum sas_protocol attached_iproto;
 125
 126         u8   attached_sas_addr[SAS_ADDR_SIZE];
 127         u8   attached_phy_id;
 128
 129         u8   phy_change_count;
 130         enum routing_attribute routing_attr;
 131         u8   virtual:1;
 132
 133         int  last_da_index;
 134
 135         struct sas_phy *phy;
 136         struct sas_port *port;
 137 };
 138
 139 struct expander_device {
 140         struct list_head children;
 141
 142         u16    ex_change_count;
 143         u16    max_route_indexes;
 144         u8     num_phys;
 145         u8     configuring:1;
 146         u8     conf_route_table:1;
 147         u8     enclosure_logical_id[8];
 148
 149         struct ex_phy *ex_phy;
 150         struct sas_port *parent_port;
 151 };
 152
 153 /* ---------- SATA device ---------- */
 154 enum ata_command_set {
 155         ATA_COMMAND_SET   = 0,
 156         ATAPI_COMMAND_SET = 1,
 157 };
 158
 159 struct sata_device {
 160         enum   ata_command_set command_set;
 161         struct smp_resp        rps_resp; /* report_phy_sata_resp */
 162         __le16 *identify_device;
 163         __le16 *identify_packet_device;
 164
 165         u8     port_no;        /* port number, if this is a PM (Port) */
 166         struct list_head children; /* PM Ports if this is a PM */
 167
 168         struct ata_port *ap;
 169         struct ata_host ata_host;
 170         struct ata_taskfile tf;
 171         u32 sstatus;
 172         u32 serror;
 173         u32 scontrol;
 174 };
 175
 176 /* ---------- Domain device ---------- */
 177 struct domain_device {
 178         enum sas_dev_type dev_type;
 179
 180         enum sas_linkrate linkrate;
 181         enum sas_linkrate min_linkrate;
 182         enum sas_linkrate max_linkrate;
 183
 184         int  pathways;
 185
 186         struct domain_device *parent;
 187         struct list_head siblings; /* devices on the same level */
 188         struct asd_sas_port *port;        /* shortcut to root of the tree */
 189
 190         struct list_head dev_list_node;
 191
 192         enum sas_protocol    iproto;
 193         enum sas_protocol    tproto;
 194
 195         struct sas_rphy *rphy;
 196
 197         u8  sas_addr[SAS_ADDR_SIZE];
 198         u8  hashed_sas_addr[HASHED_SAS_ADDR_SIZE];
 199
 200         u8  frame_rcvd[32];
 201
 202         union {
 203                 struct expander_device ex_dev;
 204                 struct sata_device     sata_dev; /* STP & directly attached */
 205         };
 206
 207         void *lldd_dev;
 208 };
 209
 210 struct sas_discovery_event {
 211         struct work_struct work;
 212         struct asd_sas_port *port;
 213 };
 214
 215 struct sas_discovery {
 216         spinlock_t disc_event_lock;
 217         struct sas_discovery_event disc_work[DISC_NUM_EVENTS];
 218         unsigned long    pending;
 219         u8     fanout_sas_addr[8];
 220         u8     eeds_a[8];
 221         u8     eeds_b[8];
 222         int    max_level;
 223 };
 224
 225
 226 /* The port struct is Class:RW, driver:RO */
 227 struct asd_sas_port {
 228 /* private: */
 229         struct completion port_gone_completion;
 230
 231         struct sas_discovery disc;
 232         struct domain_device *port_dev;
 233         spinlock_t dev_list_lock;
 234         struct list_head dev_list;
 235         enum   sas_linkrate linkrate;
 236
 237         struct sas_phy *phy;
 238         struct work_struct work;
 239
 240 /* public: */
 241         int id;
 242
 243         enum sas_class   class;
 244         u8               sas_addr[SAS_ADDR_SIZE];
 245         u8               attached_sas_addr[SAS_ADDR_SIZE];
 246         enum sas_protocol   iproto;
 247         enum sas_protocol   tproto;
 248
 249         enum sas_oob_mode oob_mode;
 250
 251         spinlock_t       phy_list_lock;
 252         struct list_head phy_list;
 253         int              num_phys;
 254         u32              phy_mask;
 255
 256         struct sas_ha_struct *ha;
 257
 258         struct sas_port *port;
 259
 260         void *lldd_port;          /* not touched by the sas class code */
 261 };
 262
 263 struct asd_sas_event {
 264         struct work_struct work;
 265         struct asd_sas_phy *phy;
 266 };
 267
 268 /* The phy pretty much is controlled by the LLDD.
 269  * The class only reads those fields.
 270  */
 271 struct asd_sas_phy {
 272 /* private: */
 273         /* protected by ha->event_lock */
 274         struct asd_sas_event   port_events[PORT_NUM_EVENTS];
 275         struct asd_sas_event   phy_events[PHY_NUM_EVENTS];
 276
 277         unsigned long port_events_pending;
 278         unsigned long phy_events_pending;
 279
 280         int error;
 281
 282         struct sas_phy *phy;
 283
 284 /* public: */
 285         /* The following are class:RO, driver:R/W */
 286         int            enabled;   /* must be set */
 287
 288         int            id;        /* must be set */
 289         enum sas_class class;
 290         enum sas_protocol iproto;
 291         enum sas_protocol tproto;
 292
 293         enum sas_phy_type  type;
 294         enum sas_phy_role  role;
 295         enum sas_oob_mode  oob_mode;
 296         enum sas_linkrate linkrate;
 297
 298         u8   *sas_addr;           /* must be set */
 299         u8   attached_sas_addr[SAS_ADDR_SIZE]; /* class:RO, driver: R/W */
 300
 301         spinlock_t     frame_rcvd_lock;
 302         u8             *frame_rcvd; /* must be set */
 303         int            frame_rcvd_size;
 304
 305         spinlock_t     sas_prim_lock;
 306         u32            sas_prim;
 307
 308         struct list_head port_phy_el; /* driver:RO */
 309         struct asd_sas_port      *port; /* Class:RW, driver: RO */
 310
 311         struct sas_ha_struct *ha; /* may be set; the class sets it anyway */
 312
 313         void *lldd_phy;           /* not touched by the sas_class_code */
 314 };
 315
 316 struct scsi_core {
 317         struct Scsi_Host *shost;
 318
 319         spinlock_t        task_queue_lock;
 320         struct list_head  task_queue;
 321         int               task_queue_size;
 322
 323         struct task_struct *queue_thread;
 324 };
 325
 326 struct sas_ha_event {
 327         struct work_struct work;
 328         struct sas_ha_struct *ha;
 329 };
 330
 331 enum sas_ha_state {
 332         SAS_HA_REGISTERED,
 333         SAS_HA_UNREGISTERED
 334 };
 335
 336 struct sas_ha_struct {
 337 /* private: */
 338         spinlock_t       event_lock;
 339         struct sas_ha_event ha_events[HA_NUM_EVENTS];
 340         unsigned long    pending;
 341
 342         enum sas_ha_state state;
 343         spinlock_t        state_lock;
 344
 345         struct scsi_core core;
 346
 347 /* public: */
 348         char *sas_ha_name;
 349         struct device *dev;       /* should be set */
 350         struct module *lldd_module; /* should be set */
 351
 352         u8 *sas_addr;             /* must be set */
 353         u8 hashed_sas_addr[HASHED_SAS_ADDR_SIZE];
 354
 355         spinlock_t      phy_port_lock;
 356         struct asd_sas_phy  **sas_phy; /* array of valid pointers, must be set */
 357         struct asd_sas_port **sas_port; /* array of valid pointers, must be set */
 358         int             num_phys; /* must be set, gt 0, static */
 359
 360         /* The class calls this to send a task for execution. */
 361         int lldd_max_execute_num;
 362         int lldd_queue_size;
 363
 364         /* LLDD calls these to notify the class of an event. */
 365         void (*notify_ha_event)(struct sas_ha_struct *, enum ha_event);
 366         void (*notify_port_event)(struct asd_sas_phy *, enum port_event);
 367         void (*notify_phy_event)(struct asd_sas_phy *, enum phy_event);
 368
 369         void *lldd_ha;            /* not touched by sas class code */
 370
 371         struct list_head eh_done_q;
 372 };
 373
 374 #define SHOST_TO_SAS_HA(_shost) (*(struct sas_ha_struct **)(_shost)->hostdata)
 375
 376 static inline struct domain_device *
 377 starget_to_domain_dev(struct scsi_target *starget) {
 378         return starget->hostdata;
 379 }
 380
 381 static inline struct domain_device *
 382 sdev_to_domain_dev(struct scsi_device *sdev) {
 383         return starget_to_domain_dev(sdev->sdev_target);
 384 }
 385
 386 static inline struct domain_device *
 387 cmd_to_domain_dev(struct scsi_cmnd *cmd)
 388 {
 389         return sdev_to_domain_dev(cmd->device);
 390 }
 391
 392 void sas_hash_addr(u8 *hashed, const u8 *sas_addr);
 393
 394 /* Before calling a notify event, LLDD should use this function
 395  * when the link is severed (possibly from its tasklet).
 396  * The idea is that the Class only reads those, while the LLDD,
 397  * can R/W these (thus avoiding a race).
 398  */
 399 static inline void sas_phy_disconnected(struct asd_sas_phy *phy)
 400 {
 401         phy->oob_mode = OOB_NOT_CONNECTED;
 402         phy->linkrate = SAS_LINK_RATE_UNKNOWN;
 403 }
 404
 405 /* ---------- Tasks ---------- */
 406 /*
 407       service_response |  SAS_TASK_COMPLETE  |  SAS_TASK_UNDELIVERED |
 408   exec_status          |                     |                       |
 409   ---------------------+---------------------+-----------------------+
 410        SAM_...         |         X           |                       |
 411        DEV_NO_RESPONSE |         X           |           X           |
 412        INTERRUPTED     |         X           |                       |
 413        QUEUE_FULL      |                     |           X           |
 414        DEVICE_UNKNOWN  |                     |           X           |
 415        SG_ERR          |                     |           X           |
 416   ---------------------+---------------------+-----------------------+
 417  */
 418
 419 enum service_response {
 420         SAS_TASK_COMPLETE,
 421         SAS_TASK_UNDELIVERED = -1,
 422 };
 423
 424 enum exec_status {
 425         /* The SAM_STAT_.. codes fit in the lower 6 bits */
 426
 427         SAS_DEV_NO_RESPONSE = 0x80,
 428         SAS_DATA_UNDERRUN,
 429         SAS_DATA_OVERRUN,
 430         SAS_INTERRUPTED,
 431         SAS_QUEUE_FULL,
 432         SAS_DEVICE_UNKNOWN,
 433         SAS_SG_ERR,
 434         SAS_OPEN_REJECT,
 435         SAS_OPEN_TO,
 436         SAS_PROTO_RESPONSE,
 437         SAS_PHY_DOWN,
 438         SAS_NAK_R_ERR,
 439         SAS_PENDING,
 440         SAS_ABORTED_TASK,
 441 };
 442
 443 /* When a task finishes with a response, the LLDD examines the
 444  * response:
 445  *      - For an ATA task task_status_struct::stat is set to
 446  * SAS_PROTO_RESPONSE, and the task_status_struct::buf is set to the
 447  * contents of struct ata_task_resp.
 448  *      - For SSP tasks, if no data is present or status/TMF response
 449  * is valid, task_status_struct::stat is set.  If data is present
 450  * (SENSE data), the LLDD copies up to SAS_STATUS_BUF_SIZE, sets
 451  * task_status_struct::buf_valid_size, and task_status_struct::stat is
 452  * set to SAM_CHECK_COND.
 453  *
 454  * "buf" has format SCSI Sense for SSP task, or struct ata_task_resp
 455  * for ATA task.
 456  *
 457  * "frame_len" is the total frame length, which could be more or less
 458  * than actually copied.
 459  *
 460  * Tasks ending with response, always set the residual field.
 461  */
 462 struct ata_task_resp {
 463         u16  frame_len;
 464         u8   ending_fis[24];      /* dev to host or data-in */
 465         u32  sstatus;
 466         u32  serror;
 467         u32  scontrol;
 468         u32  sactive;
 469 };
 470
 471 #define SAS_STATUS_BUF_SIZE 96
 472
 473 struct task_status_struct {
 474         enum service_response resp;
 475         enum exec_status      stat;
 476         int  buf_valid_size;
 477
 478         u8   buf[SAS_STATUS_BUF_SIZE];
 479
 480         u32  residual;
 481         enum sas_open_rej_reason open_rej_reason;
 482 };
 483
 484 /* ATA and ATAPI task queuable to a SAS LLDD.
 485  */
 486 struct sas_ata_task {
 487         struct host_to_dev_fis fis;
 488         u8     atapi_packet[16];  /* 0 if not ATAPI task */
 489
 490         u8     retry_count;       /* hardware retry, should be > 0 */
 491
 492         u8     dma_xfer:1;        /* PIO:0 or DMA:1 */
 493         u8     use_ncq:1;
 494         u8     set_affil_pol:1;
 495         u8     stp_affil_pol:1;
 496
 497         u8     device_control_reg_update:1;
 498 };
 499
 500 struct sas_smp_task {
 501         struct scatterlist smp_req;
 502         struct scatterlist smp_resp;
 503 };
 504
 505 enum task_attribute {
 506         TASK_ATTR_SIMPLE = 0,
 507         TASK_ATTR_HOQ    = 1,
 508         TASK_ATTR_ORDERED= 2,
 509         TASK_ATTR_ACA    = 4,
 510 };
 511
 512 struct sas_ssp_task {
 513         u8     retry_count;       /* hardware retry, should be > 0 */
 514
 515         u8     LUN[8];
 516         u8     enable_first_burst:1;
 517         enum   task_attribute task_attr;
 518         u8     task_prio;
 519         u8     cdb[16];
 520 };
 521
 522 struct sas_task {
 523         struct domain_device *dev;
 524         struct list_head      list;
 525
 526         spinlock_t   task_state_lock;
 527         unsigned     task_state_flags;
 528
 529         enum   sas_protocol      task_proto;
 530
 531         /* Used by the discovery code. */
 532         struct timer_list     timer;
 533         struct completion     completion;
 534
 535         union {
 536                 struct sas_ata_task ata_task;
 537                 struct sas_smp_task smp_task;
 538                 struct sas_ssp_task ssp_task;
 539         };
 540
 541         struct scatterlist *scatter;
 542         int    num_scatter;
 543         u32    total_xfer_len;
 544         u8     data_dir:2;        /* Use PCI_DMA_... */
 545
 546         struct task_status_struct task_status;
 547         void   (*task_done)(struct sas_task *);
 548
 549         void   *lldd_task;        /* for use by LLDDs */
 550         void   *uldd_task;
 551
 552         struct work_struct abort_work;
 553 };
 554
 555 extern struct kmem_cache *sas_task_cache;
 556
 557 #define SAS_TASK_STATE_PENDING      1
 558 #define SAS_TASK_STATE_DONE         2
 559 #define SAS_TASK_STATE_ABORTED      4
 560 #define SAS_TASK_NEED_DEV_RESET     8
 561 #define SAS_TASK_AT_INITIATOR       16
 562
 563 static inline struct sas_task *sas_alloc_task(gfp_t flags)
 564 {
 565         struct sas_task *task = kmem_cache_zalloc(sas_task_cache, flags);
 566
 567         if (task) {
 568                 INIT_LIST_HEAD(&task->list);
 569                 spin_lock_init(&task->task_state_lock);
 570                 task->task_state_flags = SAS_TASK_STATE_PENDING;
 571                 init_timer(&task->timer);
 572                 init_completion(&task->completion);
 573         }
 574
 575         return task;
 576 }
 577
 578 static inline void sas_free_task(struct sas_task *task)
 579 {
 580         if (task) {
 581                 BUG_ON(!list_empty(&task->list));
 582                 kmem_cache_free(sas_task_cache, task);
 583         }
 584 }
 585
 586 struct sas_domain_function_template {
 587         /* The class calls these to notify the LLDD of an event. */
 588         void (*lldd_port_formed)(struct asd_sas_phy *);
 589         void (*lldd_port_deformed)(struct asd_sas_phy *);
 590
 591         /* The class calls these when a device is found or gone. */
 592         int  (*lldd_dev_found)(struct domain_device *);
 593         void (*lldd_dev_gone)(struct domain_device *);
 594
 595         int (*lldd_execute_task)(struct sas_task *, int num,
 596                                  gfp_t gfp_flags);
 597
 598         /* Task Management Functions. Must be called from process context. */
 599         int (*lldd_abort_task)(struct sas_task *);
 600         int (*lldd_abort_task_set)(struct domain_device *, u8 *lun);
 601         int (*lldd_clear_aca)(struct domain_device *, u8 *lun);
 602         int (*lldd_clear_task_set)(struct domain_device *, u8 *lun);
 603         int (*lldd_I_T_nexus_reset)(struct domain_device *);
 604         int (*lldd_lu_reset)(struct domain_device *, u8 *lun);
 605         int (*lldd_query_task)(struct sas_task *);
 606
 607         /* Port and Adapter management */
 608         int (*lldd_clear_nexus_port)(struct asd_sas_port *);
 609         int (*lldd_clear_nexus_ha)(struct sas_ha_struct *);
 610
 611         /* Phy management */
 612         int (*lldd_control_phy)(struct asd_sas_phy *, enum phy_func, void *);
 613 };
 614
 615 extern int sas_register_ha(struct sas_ha_struct *);
 616 extern int sas_unregister_ha(struct sas_ha_struct *);
 617
 618 int sas_set_phy_speed(struct sas_phy *phy,
 619                       struct sas_phy_linkrates *rates);
 620 int sas_phy_enable(struct sas_phy *phy, int enabled);
 621 int sas_phy_reset(struct sas_phy *phy, int hard_reset);
 622 int sas_queue_up(struct sas_task *task);
 623 extern int sas_queuecommand(struct scsi_cmnd *,
 624                      void (*scsi_done)(struct scsi_cmnd *));
 625 extern int sas_target_alloc(struct scsi_target *);
 626 extern int sas_slave_alloc(struct scsi_device *);
 627 extern int sas_slave_configure(struct scsi_device *);
 628 extern void sas_slave_destroy(struct scsi_device *);
 629 extern int sas_change_queue_depth(struct scsi_device *, int new_depth,
 630                                   int reason);
 631 extern int sas_change_queue_type(struct scsi_device *, int qt);
 632 extern int sas_bios_param(struct scsi_device *,
 633                           struct block_device *,
 634                           sector_t capacity, int *hsc);
 635 extern struct scsi_transport_template *
 636 sas_domain_attach_transport(struct sas_domain_function_template *);
 637 extern void sas_domain_release_transport(struct scsi_transport_template *);
 638
 639 int  sas_discover_root_expander(struct domain_device *);
 640
 641 void sas_init_ex_attr(void);
 642
 643 int  sas_ex_revalidate_domain(struct domain_device *);
 644
 645 void sas_unregister_domain_devices(struct asd_sas_port *port);
 646 void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *);
 647 int  sas_discover_event(struct asd_sas_port *, enum discover_event ev);
 648
 649 int  sas_discover_sata(struct domain_device *);
 650 int  sas_discover_end_dev(struct domain_device *);
 651
 652 void sas_unregister_dev(struct domain_device *);
 653
 654 void sas_init_dev(struct domain_device *);
 655
 656 void sas_task_abort(struct sas_task *);
 657 int __sas_task_abort(struct sas_task *);
 658 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd);
 659 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd);
 660
 661 extern void sas_target_destroy(struct scsi_target *);
 662 extern int sas_slave_alloc(struct scsi_device *);
 663 extern int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg);
 664
 665 extern int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
 666                            struct request *req);
 667
 668 extern void sas_ssp_task_response(struct device *dev, struct sas_task *task,
 669                                   struct ssp_response_iu *iu);
 670 struct sas_phy *sas_find_local_phy(struct domain_device *dev);
 671
 672 int sas_request_addr(struct Scsi_Host *shost, u8 *addr);
 673
 674 #endif /* _SASLIB_H_ */