sys/dev/raid/twe/twevar.h

   1 /*-
   2  * Copyright (c) 2000 Michael Smith
   3  * Copyright (c) 2003 Paul Saab
   4  * Copyright (c) 2003 Vinod Kashyap
   5  * Copyright (c) 2000 BSDi
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      $FreeBSD: src/sys/dev/twe/twevar.h,v 1.1.2.8 2004/06/11 18:57:32 vkashyap Exp $
  30  *      $DragonFly: src/sys/dev/raid/twe/twevar.h,v 1.6 2006/02/17 19:18:06 dillon Exp $
  31  */
  32
  33 #define TWE_DRIVER_VERSION_STRING       "1.40.01.002"
  34 #define TWE_CDEV_MAJOR                  146
  35 #define TWED_CDEV_MAJOR                 147
  36
  37
  38 #ifdef TWE_DEBUG
  39 #define debug(level, fmt, args...)                                                      \
  40         do {                                                                            \
  41             if (level <= TWE_DEBUG) printf("%s: " fmt "\n", __func__ , ##args); \
  42         } while(0)
  43 #define debug_called(level)                                             \
  44         do {                                                            \
  45             if (level <= TWE_DEBUG) printf("%s: called\n", __func__);   \
  46         } while(0)
  47 #else
  48 #define debug(level, fmt, args...)
  49 #define debug_called(level)
  50 #endif
  51
  52 /*
  53  * Structure describing a logical unit as attached to the controller
  54  */
  55 struct twe_drive
  56 {
  57     /* unit properties */
  58     u_int32_t           td_size;
  59     int                 td_cylinders;
  60     int                 td_heads;
  61     int                 td_sectors;
  62     int                 td_sys_unit; /* Unit #, as seen by the system
  63                                      (the 0 in twed0, the 1 in twed1 etc.) */
  64     int                 td_twe_unit; /* Unit #, as seen by us, and our ctlr
  65                                      (index into sc->twe_drive[]) */
  66
  67     /* unit state and type */
  68     u_int8_t            td_state;
  69     u_int8_t            td_type;
  70
  71     /* handle for attached driver */
  72     device_t            td_disk;
  73 };
  74
  75 /*
  76  * Disk device softc
  77  */
  78 struct twed_softc
  79 {
  80     device_t            twed_dev;
  81     dev_t               twed_dev_t;
  82     struct twe_softc    *twed_controller;       /* parent device softc */
  83     struct twe_drive    *twed_drive;            /* drive data in parent softc */
  84     struct disk         twed_disk;              /* generic disk handle */
  85     struct devstat      twed_stats;             /* accounting */
  86     struct disklabel    twed_label;             /* synthetic label */
  87     int                 twed_flags;
  88 #define TWED_OPEN       (1<<0)                  /* drive is open (can't shut down) */
  89 };
  90
  91 /*
  92  * Per-command control structure.
  93  *
  94  * Note that due to alignment constraints on the tc_command field, this *must* be 64-byte aligned.
  95  * We achieve this by placing the command at the beginning of the structure, and using malloc()
  96  * to allocate each structure.
  97  */
  98 struct twe_request
  99 {
 100     /* controller command */
 101     TWE_Command                 tr_command;     /* command as submitted to controller */
 102
 103     /* command payload */
 104     void                        *tr_data;       /* data buffer */
 105     void                        *tr_realdata;   /* copy of real data buffer pointer for alignment fixup */
 106     size_t                      tr_length;
 107
 108     TAILQ_ENTRY(twe_request)    tr_link;        /* list linkage */
 109     struct twe_softc            *tr_sc;         /* controller that owns us */
 110     int                         tr_status;      /* command status */
 111 #define TWE_CMD_SETUP           0       /* being assembled */
 112 #define TWE_CMD_BUSY            1       /* submitted to controller */
 113 #define TWE_CMD_COMPLETE        2       /* completed by controller (maybe with error) */
 114 #define TWE_CMD_ERROR           3       /* encountered error, even before submission to controller */
 115     int                         tr_flags;
 116 #define TWE_CMD_DATAIN          (1<<0)
 117 #define TWE_CMD_DATAOUT         (1<<1)
 118 #define TWE_CMD_ALIGNBUF        (1<<2)  /* data in bio is misaligned, have to copy to/from private buffer */
 119 #define TWE_CMD_SLEEPER         (1<<3)  /* owner is sleeping on this command */
 120 #define TWE_CMD_MAPPED          (1<<4)  /* cmd has been mapped */
 121 #define TWE_CMD_IN_PROGRESS     (1<<5)  /* bus_dmamap_load returned EINPROGRESS */
 122     void                        (* tr_complete)(struct twe_request *tr);        /* completion handler */
 123     void                        *tr_private;    /* submitter-private data or wait channel */
 124
 125     TWE_PLATFORM_REQUEST        /* platform-specific request elements */
 126 };
 127
 128 /*
 129  * Per-controller state.
 130  */
 131 struct twe_softc
 132 {
 133     /* controller queues and arrays */
 134     TAILQ_HEAD(, twe_request)   twe_free;                       /* command structures available for reuse */
 135     twe_bioq                    twe_bioq;                       /* outstanding I/O operations */
 136     TAILQ_HEAD(, twe_request)   twe_ready;                      /* requests ready for the controller */
 137     TAILQ_HEAD(, twe_request)   twe_busy;                       /* requests busy in the controller */
 138     TAILQ_HEAD(, twe_request)   twe_complete;                   /* active commands (busy or waiting for completion) */
 139     struct twe_request          *twe_lookup[TWE_Q_LENGTH];      /* commands indexed by request ID */
 140     struct twe_drive    twe_drive[TWE_MAX_UNITS];               /* attached drives */
 141
 142     /* asynchronous event handling */
 143     u_int16_t           twe_aen_queue[TWE_Q_LENGTH];    /* AENs queued for userland tool(s) */
 144     int                 twe_aen_head, twe_aen_tail;     /* ringbuffer pointers for AEN queue */
 145     int                 twe_wait_aen;                   /* wait-for-aen notification */
 146
 147     /* controller status */
 148     int                 twe_state;
 149 #define TWE_STATE_INTEN         (1<<0)  /* interrupts have been enabled */
 150 #define TWE_STATE_SHUTDOWN      (1<<1)  /* controller is shut down */
 151 #define TWE_STATE_OPEN          (1<<2)  /* control device is open */
 152 #define TWE_STATE_SUSPEND       (1<<3)  /* controller is suspended */
 153 #define TWE_STATE_FRZN          (1<<4)  /* got EINPROGRESS */
 154 #define TWE_STATE_CTLR_BUSY     (1<<5)  /* controller cmd queue full */
 155     int                 twe_host_id;
 156     struct twe_qstat    twe_qstat[TWEQ_COUNT];  /* queue statistics */
 157
 158     TWE_PLATFORM_SOFTC          /* platform-specific softc elements */
 159 };
 160
 161 /*
 162  * Interface betwen driver core and platform-dependant code.
 163  */
 164 extern int      twe_setup(struct twe_softc *sc);                /* do early driver/controller setup */
 165 extern void     twe_init(struct twe_softc *sc);                 /* init controller */
 166 extern void     twe_deinit(struct twe_softc *sc);               /* stop controller */
 167 extern void     twe_intr(struct twe_softc *sc);                 /* hardware interrupt signalled */
 168 extern void     twe_startio(struct twe_softc *sc);
 169 extern int      twe_start(struct twe_request *tr);
 170 extern int      twe_dump_blocks(struct twe_softc *sc, int unit, /* crashdump block write */
 171                                 u_int32_t lba, void *data, int nblks);
 172 extern int      twe_ioctl(struct twe_softc *sc, int cmd,
 173                                   void *addr);                  /* handle user request */
 174 extern void     twe_describe_controller(struct twe_softc *sc);  /* print controller info */
 175 extern char     *twe_describe_code(struct twe_code_lookup *table, u_int32_t code);
 176 extern void     twe_print_controller(struct twe_softc *sc);
 177 extern void     twe_enable_interrupts(struct twe_softc *sc);    /* enable controller interrupts */
 178 extern void     twe_disable_interrupts(struct twe_softc *sc);   /* disable controller interrupts */
 179
 180 extern int      twe_attach_drive(struct twe_softc *sc,
 181                                          struct twe_drive *dr); /* attach drive when found in twe_init */
 182 extern int      twe_detach_drive(struct twe_softc *sc,
 183                                          int unit);             /* detach drive */
 184 extern void     twe_clear_pci_parity_error(struct twe_softc *sc);
 185 extern void     twe_clear_pci_abort(struct twe_softc *sc);
 186 extern void     twed_intr(twe_bio *bp);                         /* return bio from core */
 187 extern struct   twe_request *twe_allocate_request(struct twe_softc *sc);/* allocate request structure */
 188 extern int      twe_map_request(struct twe_request *tr);        /* make request visible to controller, do s/g */
 189 extern void     twe_unmap_request(struct twe_request *tr);      /* cleanup after transfer, unmap */
 190
 191 /********************************************************************************
 192  * Queue primitives
 193  */
 194 #define TWEQ_ADD(sc, qname)                                     \
 195         do {                                                    \
 196             struct twe_qstat *qs = &(sc)->twe_qstat[qname];     \
 197                                                                 \
 198             qs->q_length++;                                     \
 199             if (qs->q_length > qs->q_max)                       \
 200                 qs->q_max = qs->q_length;                       \
 201         } while(0)
 202
 203 #define TWEQ_REMOVE(sc, qname)                                  \
 204         do {                                                    \
 205             struct twe_qstat *qs = &(sc)->twe_qstat[qname];     \
 206                                                                 \
 207             qs->q_length--;                                     \
 208             if (qs->q_length < qs->q_min)                       \
 209                 qs->q_min = qs->q_length;                       \
 210         } while(0)
 211
 212 #define TWEQ_INIT(sc, qname)                            \
 213         do {                                            \
 214             sc->twe_qstat[qname].q_length = 0;          \
 215             sc->twe_qstat[qname].q_max = 0;             \
 216             sc->twe_qstat[qname].q_min = 0xFFFFFFFF;    \
 217         } while(0)
 218
 219
 220 #define TWEQ_REQUEST_QUEUE(name, index)                                 \
 221 static __inline void                                                    \
 222 twe_initq_ ## name (struct twe_softc *sc)                               \
 223 {                                                                       \
 224     TAILQ_INIT(&sc->twe_ ## name);                                      \
 225     TWEQ_INIT(sc, index);                                               \
 226 }                                                                       \
 227 static __inline void                                                    \
 228 twe_enqueue_ ## name (struct twe_request *tr)                           \
 229 {                                                                       \
 230     crit_enter();                                                       \
 231     TAILQ_INSERT_TAIL(&tr->tr_sc->twe_ ## name, tr, tr_link);           \
 232     TWEQ_ADD(tr->tr_sc, index);                                         \
 233     crit_exit();                                                        \
 234 }                                                                       \
 235 static __inline void                                                    \
 236 twe_requeue_ ## name (struct twe_request *tr)                           \
 237 {                                                                       \
 238     crit_enter();                                                       \
 239     TAILQ_INSERT_HEAD(&tr->tr_sc->twe_ ## name, tr, tr_link);           \
 240     TWEQ_ADD(tr->tr_sc, index);                                         \
 241     crit_exit();                                                        \
 242 }                                                                       \
 243 static __inline struct twe_request *                                    \
 244 twe_dequeue_ ## name (struct twe_softc *sc)                             \
 245 {                                                                       \
 246     struct twe_request  *tr;                                            \
 247                                                                         \
 248     crit_enter();                                                       \
 249     if ((tr = TAILQ_FIRST(&sc->twe_ ## name)) != NULL) {                \
 250         TAILQ_REMOVE(&sc->twe_ ## name, tr, tr_link);                   \
 251         TWEQ_REMOVE(sc, index);                                         \
 252     }                                                                   \
 253     crit_exit();                                                        \
 254     return(tr);                                                         \
 255 }                                                                       \
 256 static __inline void                                                    \
 257 twe_remove_ ## name (struct twe_request *tr)                            \
 258 {                                                                       \
 259     crit_enter();                                                       \
 260     TAILQ_REMOVE(&tr->tr_sc->twe_ ## name, tr, tr_link);                \
 261     TWEQ_REMOVE(tr->tr_sc, index);                                      \
 262     crit_exit();                                                        \
 263 }
 264
 265 TWEQ_REQUEST_QUEUE(free, TWEQ_FREE)
 266 TWEQ_REQUEST_QUEUE(ready, TWEQ_READY)
 267 TWEQ_REQUEST_QUEUE(busy, TWEQ_BUSY)
 268 TWEQ_REQUEST_QUEUE(complete, TWEQ_COMPLETE)
 269
 270
 271 /*
 272  * outstanding bio queue
 273  */
 274 static __inline void
 275 twe_initq_bio(struct twe_softc *sc)
 276 {
 277     bioq_init(&sc->twe_bioq);
 278     TWEQ_INIT(sc, TWEQ_BIO);
 279 }
 280
 281 static __inline void
 282 twe_enqueue_bio(struct twe_softc *sc, struct bio *bio)
 283 {
 284     crit_enter();
 285     bioq_insert_tail(&sc->twe_bioq, bio);
 286     TWEQ_ADD(sc, TWEQ_BIO);
 287     crit_exit();
 288 }
 289
 290 static __inline
 291 struct bio *
 292 twe_dequeue_bio(struct twe_softc *sc)
 293 {
 294     struct bio *bio;
 295
 296     crit_enter();
 297     if ((bio = bioq_first(&sc->twe_bioq)) != NULL) {
 298         bioq_remove(&sc->twe_bioq, bio);
 299         TWEQ_REMOVE(sc, TWEQ_BIO);
 300     }
 301     crit_exit();
 302     return(bio);
 303 }