55 static void xbuf_restart_callback(void *arg);
  56 static void xbuf_enqueue(struct buf *bp, ddi_xbuf_attr_t xap);
  57 static int xbuf_brk_done(struct buf *bp);
  58 
  59 
  60 /*
  61  * Note: Should this be exposed to the caller.... do we want to give the
  62  * caller the fexibility of specifying the parameters for the thread pool?
  63  * Note: these values are just estimates at this time, based upon what
  64  * seems reasonable for the sd driver. It may be preferable to make these
  65  * parameters self-scaling in a real (future) implementation.
  66  */
  67 #define XBUF_TQ_MINALLOC        64
  68 #define XBUF_TQ_MAXALLOC        512
  69 #define XBUF_DISPATCH_DELAY     (drv_usectohz(50000))   /* 50 msec */
  70 
  71 static taskq_t *xbuf_tq = NULL;
  72 static int xbuf_attr_tq_minalloc = XBUF_TQ_MINALLOC;
  73 static int xbuf_attr_tq_maxalloc = XBUF_TQ_MAXALLOC;
  74 
  75 static kmutex_t xbuf_mutex = { 0 };
  76 static uint32_t xbuf_refcount = 0;
  77 
  78 /*
  79  * Private wrapper for buf cloned via ddi_xbuf_qstrategy()
  80  */
  81 struct xbuf_brk {
  82         kmutex_t mutex;
  83         struct buf *bp0;
  84         uint8_t nbufs;  /* number of buf allocated */
  85         uint8_t active; /* number of active xfer */
  86 
  87         size_t brksize; /* break size used for this buf */
  88         int brkblk;
  89 
  90         /* xfer position */
  91         off_t off;
  92         off_t noff;
  93         daddr_t blkno;
  94 };
  95 

  55 static void xbuf_restart_callback(void *arg);
  56 static void xbuf_enqueue(struct buf *bp, ddi_xbuf_attr_t xap);
  57 static int xbuf_brk_done(struct buf *bp);
  58 
  59 
  60 /*
  61  * Note: Should this be exposed to the caller.... do we want to give the
  62  * caller the fexibility of specifying the parameters for the thread pool?
  63  * Note: these values are just estimates at this time, based upon what
  64  * seems reasonable for the sd driver. It may be preferable to make these
  65  * parameters self-scaling in a real (future) implementation.
  66  */
  67 #define XBUF_TQ_MINALLOC        64
  68 #define XBUF_TQ_MAXALLOC        512
  69 #define XBUF_DISPATCH_DELAY     (drv_usectohz(50000))   /* 50 msec */
  70 
  71 static taskq_t *xbuf_tq = NULL;
  72 static int xbuf_attr_tq_minalloc = XBUF_TQ_MINALLOC;
  73 static int xbuf_attr_tq_maxalloc = XBUF_TQ_MAXALLOC;
  74 
  75 static kmutex_t xbuf_mutex = { {NULL} };
  76 static uint32_t xbuf_refcount = 0;
  77 
  78 /*
  79  * Private wrapper for buf cloned via ddi_xbuf_qstrategy()
  80  */
  81 struct xbuf_brk {
  82         kmutex_t mutex;
  83         struct buf *bp0;
  84         uint8_t nbufs;  /* number of buf allocated */
  85         uint8_t active; /* number of active xfer */
  86 
  87         size_t brksize; /* break size used for this buf */
  88         int brkblk;
  89 
  90         /* xfer position */
  91         off_t off;
  92         off_t noff;
  93         daddr_t blkno;
  94 };
  95