FreeBSD/Linux Kernel Cross Reference
sys/dev/raid/mlx/mlxvar.h

     /*-
      * Copyright (c) 1999 Michael Smith
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      $FreeBSD: src/sys/dev/mlx/mlxvar.h,v 1.5.2.3 2001/06/25 04:37:51 msmith Exp $
     *      $DragonFly: src/sys/dev/raid/mlx/mlxvar.h,v 1.11 2007/05/15 00:01:04 dillon Exp $
     */
    
    /*
     * Debugging levels:
     *  0 - quiet, only emit warnings
     *  1 - noisy, emit major function points and things done
     *  2 - extremely noisy, emit trace items in loops, etc.
     */
    #ifdef MLX_DEBUG
    #define debug(level, fmt, args...)      do { if (level <= MLX_DEBUG) kprintf("%s: " fmt "\n", __func__ , ##args); } while(0)
    #define debug_called(level)             do { if (level <= MLX_DEBUG) kprintf(__func__ ": called\n"); } while(0)
    #else
    #define debug(level, fmt, args...)
    #define debug_called(level)
    #endif
    
    /*
     * Regardless of the actual capacity of the controller, we will allocate space
     * for 64 s/g entries.  Typically controllers support 17 or 33 entries (64k or
     * 128k maximum transfer assuming 4k page size and non-optimal alignment), but
     * making that fit cleanly without crossing page boundaries requires rounding up
     * to the next power of two.
     */
    #define MLX_NSEG        64
    
    #define MLX_NSLOTS      256             /* max number of command slots */
    
    #define MLX_MAXDRIVES   32              /* max number of system drives */
    
    /*
     * Structure describing a System Drive as attached to the controller.
     */
    struct mlx_sysdrive 
    {
        /* from MLX_CMD_ENQSYSDRIVE */
        u_int32_t           ms_size;
        int                 ms_state;
        int                 ms_raidlevel;
    
        /* synthetic geometry */
        int                 ms_cylinders;
        int                 ms_heads;
        int                 ms_sectors;
    
        /* handle for attached driver */
        device_t            ms_disk;
    };
    
    /*
     * Per-command control structure.
     */
    struct mlx_command 
    {
        TAILQ_ENTRY(mlx_command)    mc_link;        /* list linkage */
    
        struct mlx_softc            *mc_sc;         /* controller that owns us */
        u_int8_t                    mc_slot;        /* command slot we occupy */
        u_int16_t                   mc_status;      /* command completion status */
        time_t                      mc_timeout;     /* when this command expires */
        u_int8_t                    mc_mailbox[16]; /* command mailbox */
        u_int32_t                   mc_sgphys;      /* physical address of s/g array in controller space */
        int                         mc_nsgent;      /* number of entries in s/g map */
        int                         mc_flags;
    #define MLX_CMD_DATAIN          (1<<0)
    #define MLX_CMD_DATAOUT         (1<<1)
    #define MLX_CMD_PRIORITY        (1<<2)          /* high-priority command */
    
        void                        *mc_data;       /* data buffer */
        size_t                      mc_length;
        bus_dmamap_t                mc_dmamap;      /* DMA map for data */
        u_int32_t                   mc_dataphys;    /* data buffer base address controller space */
    
       void                        (* mc_complete)(struct mlx_command *mc);        /* completion handler */
       void                        *mc_private;    /* submitter-private data or wait channel */
   };
   
   /*
    * Per-controller structure.
    */
   struct mlx_softc 
   {
       /* bus connections */
       device_t            mlx_dev;
       struct resource     *mlx_mem;       /* mailbox interface window */
       int                 mlx_mem_rid;
       int                 mlx_mem_type;
       bus_space_handle_t  mlx_bhandle;    /* bus space handle */
       bus_space_tag_t     mlx_btag;       /* bus space tag */
       bus_dma_tag_t       mlx_parent_dmat;/* parent DMA tag */
       bus_dma_tag_t       mlx_buffer_dmat;/* data buffer DMA tag */
       struct resource     *mlx_irq;       /* interrupt */
       void                *mlx_intr;      /* interrupt handle */
   
       /* scatter/gather lists and their controller-visible mappings */
       struct mlx_sgentry  *mlx_sgtable;   /* s/g lists */
       u_int32_t           mlx_sgbusaddr;  /* s/g table base address in bus space */
       bus_dma_tag_t       mlx_sg_dmat;    /* s/g buffer DMA tag */
       bus_dmamap_t        mlx_sg_dmamap;  /* map for s/g buffers */
       
       /* controller limits and features */
       struct mlx_enquiry2 *mlx_enq2;
       int                 mlx_feature;    /* controller features/quirks */
   #define MLX_FEAT_PAUSEWORKS     (1<<0)  /* channel pause works as expected */
   
       /* controller queues and arrays */
       TAILQ_HEAD(, mlx_command)   mlx_freecmds;           /* command structures available for reuse */
       TAILQ_HEAD(, mlx_command)   mlx_work;               /* active commands */
       struct mlx_command  *mlx_busycmd[MLX_NSLOTS];       /* busy commands */
       int                 mlx_busycmds;                   /* count of busy commands */
       struct mlx_sysdrive mlx_sysdrive[MLX_MAXDRIVES];    /* system drives */
       mlx_bioq            mlx_bioq;                       /* outstanding I/O operations */
       int                 mlx_waitbufs;                   /* number of bufs awaiting commands */
   
       /* controller status */
       int                 mlx_geom;
   #define MLX_GEOM_128_32         0       /* geoemetry translation modes */
   #define MLX_GEOM_256_63         1
       int                 mlx_state;
   #define MLX_STATE_INTEN         (1<<0)  /* interrupts have been enabled */
   #define MLX_STATE_SHUTDOWN      (1<<1)  /* controller is shut down */
   #define MLX_STATE_OPEN          (1<<2)  /* control device is open */
   #define MLX_STATE_SUSPEND       (1<<3)  /* controller is suspended */
       struct callout      mlx_timeout;    /* periodic status monitor */
       time_t              mlx_lastpoll;   /* last time_uptime we polled for status */
       u_int16_t           mlx_lastevent;  /* sequence number of the last event we recorded */
       int                 mlx_currevent;  /* sequence number last time we looked */
       int                 mlx_background; /* if != 0 rebuild or check is in progress */
   #define MLX_BACKGROUND_CHECK            1       /* we started a check */
   #define MLX_BACKGROUND_REBUILD          2       /* we started a rebuild */
   #define MLX_BACKGROUND_SPONTANEOUS      3       /* it just happened somehow */
       struct mlx_rebuild_status mlx_rebuildstat;  /* last rebuild status */
       struct mlx_pause    mlx_pause;      /* pending pause operation details */
   
       int                 mlx_locks;      /* reentrancy avoidance */
       int                 mlx_flags;
   #define MLX_SPINUP_REPORTED     (1<<0)  /* "spinning up drives" message displayed */
   #define MLX_EVENTLOG_BUSY       (1<<1)  /* currently reading event log */
   
       /* interface-specific accessor functions */
       int                 mlx_iftype;     /* interface protocol */
   #define MLX_IFTYPE_2    2
   #define MLX_IFTYPE_3    3
   #define MLX_IFTYPE_4    4
   #define MLX_IFTYPE_5    5
       int                 (* mlx_tryqueue)(struct mlx_softc *sc, struct mlx_command *mc);
       int                 (* mlx_findcomplete)(struct mlx_softc *sc, u_int8_t *slot, u_int16_t *status);
       void                (* mlx_intaction)(struct mlx_softc *sc, int action);
       int                 (* mlx_fw_handshake)(struct mlx_softc *sc, int *error, int *param1, int *param2);
   #define MLX_INTACTION_DISABLE           0
   #define MLX_INTACTION_ENABLE            1
   };
   
   /*
    * Simple (stupid) locks.
    *
    * Note that these are designed to avoid reentrancy, not concurrency, and will
    * need to be replaced with something better.
    */
   #define MLX_LOCK_COMPLETING     (1<<0)
   #define MLX_LOCK_STARTING       (1<<1)
   
   static __inline int
   mlx_lock_tas(struct mlx_softc *sc, int lock)
   {
       if ((sc)->mlx_locks & (lock))
           return(1);
       atomic_set_int(&sc->mlx_locks, lock);
       return(0);
   }
   
   static __inline void
   mlx_lock_clr(struct mlx_softc *sc, int lock)
   {
       atomic_clear_int(&sc->mlx_locks, lock);
   }
   
   /*
    * Interface between bus connections and driver core.
    */
   extern void             mlx_free(struct mlx_softc *sc);
   extern int              mlx_attach(struct mlx_softc *sc);
   extern void             mlx_startup(struct mlx_softc *sc);
   extern void             mlx_intr(void *data);
   extern int              mlx_detach(device_t dev);
   extern int              mlx_shutdown(device_t dev);
   extern int              mlx_suspend(device_t dev); 
   extern int              mlx_resume(device_t dev);
   extern d_open_t         mlx_open;
   extern d_close_t        mlx_close;
   extern d_ioctl_t        mlx_ioctl;
   
   extern devclass_t       mlx_devclass;
   extern devclass_t       mlxd_devclass;
   
   /*
    * Mylex System Disk driver
    */
   struct mlxd_softc 
   {
       device_t            mlxd_dev;
       cdev_t              mlxd_dev_t;
       struct mlx_softc    *mlxd_controller;
       struct mlx_sysdrive *mlxd_drive;
       struct disk         mlxd_disk;
       struct devstat      mlxd_stats;
       int                 mlxd_unit;
       int                 mlxd_flags;
   #define MLXD_OPEN       (1<<0)          /* drive is open (can't shut down) */
   };
   
   /*
    * Interface between driver core and disk driver (should be using a bus?)
    */
   extern int      mlx_submit_bio(struct mlx_softc *sc, struct bio *bio);
   extern int      mlx_submit_ioctl(struct mlx_softc *sc,
                                    struct mlx_sysdrive *drive, u_long cmd, 
                                    caddr_t addr, int32_t flag);
   extern void     mlxd_intr(struct bio *bio);
   
   

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