sys/bus/cam/cam_sim.h

   1 /*
   2  * Data structures and definitions for SCSI Interface Modules (SIMs).
   3  *
   4  * Copyright (c) 1997 Justin T. Gibbs.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions, and the following disclaimer,
  12  *    without modification, immediately at the beginning of the file.
  13  * 2. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  20  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $FreeBSD: src/sys/cam/cam_sim.h,v 1.4 1999/12/29 04:54:27 peter Exp $
  29  * $DragonFly: src/sys/bus/cam/cam_sim.h,v 1.8 2008/06/29 19:15:34 dillon Exp $
  30  */
  31
  32 #ifndef _CAM_CAM_SIM_H
  33 #define _CAM_CAM_SIM_H 1
  34
  35 #ifdef _KERNEL
  36
  37 #ifndef _SYS_SPINLOCK_H_
  38 #include <sys/spinlock.h>
  39 #endif
  40
  41 /*
  42  * The sim driver creates a sim for each controller.  The sim device
  43  * queue is separately created in order to allow resource sharing between
  44  * sims.  For instance, a driver may create one sim for each channel of
  45  * a multi-channel controller and use the same queue for each channel.
  46  * In this way, the queue resources are shared across all the channels
  47  * of the multi-channel controller.
  48  */
  49
  50 struct cam_sim;
  51 struct cam_devq;
  52
  53 typedef void (*sim_action_func)(struct cam_sim *sim, union ccb *ccb);
  54 typedef void (*sim_poll_func)(struct cam_sim *sim);
  55
  56 typedef struct lock     sim_lock;
  57 extern  sim_lock        sim_mplock;
  58
  59 void              cam_sim_lock(sim_lock *lock);
  60 void              cam_sim_unlock(sim_lock *lock);
  61 void              sim_lock_assert_owned(sim_lock *lock);
  62 int               sim_lock_sleep(void *ident, int flags, const char *wmesg,
  63                                  int timo, sim_lock *lock);
  64 struct cam_devq * cam_simq_alloc(u_int32_t max_sim_transactions);
  65 void              cam_simq_release(struct cam_devq *devq);
  66
  67 struct cam_sim *  cam_sim_alloc(sim_action_func sim_action,
  68                                 sim_poll_func sim_poll,
  69                                 const char *sim_name,
  70                                 void *softc,
  71                                 u_int32_t unit,
  72                                 sim_lock *lock,
  73                                 int max_dev_transactions,
  74                                 int max_tagged_dev_transactions,
  75                                 struct cam_devq *queue);
  76 void              cam_sim_free(struct cam_sim *sim);
  77 void              cam_sim_release(struct cam_sim *sim, int flags);
  78
  79 #define CAM_SIM_SOFTC   0x0002
  80
  81 /* Optional sim attributes may be set with these. */
  82 void    cam_sim_set_path(struct cam_sim *sim, u_int32_t path_id);
  83
  84
  85
  86 /* Convenience routines for accessing sim attributes. */
  87 static __inline u_int32_t cam_sim_path(struct cam_sim *sim);
  88 static __inline const char *cam_sim_name(struct cam_sim *sim);
  89 static __inline void *    cam_sim_softc(struct cam_sim *sim);
  90 static __inline u_int32_t cam_sim_unit(struct cam_sim *sim);
  91 static __inline u_int32_t cam_sim_bus(struct cam_sim *sim);
  92
  93
  94
  95 /* Generically useful offsets into the sim private area */
  96 #define spriv_ptr0 sim_priv.entries[0].ptr
  97 #define spriv_ptr1 sim_priv.entries[1].ptr
  98 #define spriv_field0 sim_priv.entries[0].field
  99 #define spriv_field1 sim_priv.entries[1].field
 100
 101 /*
 102  * The sim driver should not access anything directly from this
 103  * structure.
 104  */
 105 struct cam_sim {
 106         sim_action_func         sim_action;
 107         sim_poll_func           sim_poll;
 108         const char              *sim_name;
 109         void                    *softc;         /* might be NULL */
 110         sim_lock                *lock;
 111         struct spinlock         sim_spin;
 112         TAILQ_HEAD(, ccb_hdr)   sim_doneq;
 113         TAILQ_ENTRY(cam_sim)    links;
 114         u_int32_t               path_id;        /* bootdev may set this to 0? */
 115         u_int32_t               unit_number;
 116         u_int32_t               bus_id;
 117         int                     max_tagged_dev_openings;
 118         int                     max_dev_openings;
 119         u_int32_t               flags;
 120 #define CAM_SIM_REL_TIMEOUT_PENDING     0x01
 121 #define CAM_SIM_MPSAFE                  0x02
 122 #define CAM_SIM_ON_DONEQ                0x04
 123         struct callout          callout;
 124         struct cam_devq         *devq;  /* Device Queue to use for this SIM */
 125         int                     refcount;       /* References to the sim */
 126
 127         /* "Pool" of inactive ccbs managed by xpt_alloc_ccb and xpt_free_ccb */
 128         SLIST_HEAD(,ccb_hdr)    ccb_freeq;
 129         /*
 130          * Maximum size of ccb pool.  Modified as devices are added/removed
 131          * or have their * opening counts changed.
 132          */
 133         u_int                   max_ccbs;
 134         /* Current count of allocated ccbs */
 135         u_int                   ccb_count;
 136
 137 };
 138
 139 #define CAM_SIM_LOCK(sim)       cam_sim_lock((sim)->lock);
 140 #define CAM_SIM_UNLOCK(sim)     cam_sim_unlock((sim)->lock);
 141
 142 static __inline u_int32_t
 143 cam_sim_path(struct cam_sim *sim)
 144 {
 145         return (sim->path_id);
 146 }
 147
 148 static __inline const char *
 149 cam_sim_name(struct cam_sim *sim)
 150 {
 151         return (sim->sim_name);
 152 }
 153
 154 static __inline void *
 155 cam_sim_softc(struct cam_sim *sim)
 156 {
 157         return (sim->softc);
 158 }
 159
 160 static __inline u_int32_t
 161 cam_sim_unit(struct cam_sim *sim)
 162 {
 163         return (sim->unit_number);
 164 }
 165
 166 static __inline u_int32_t
 167 cam_sim_bus(struct cam_sim *sim)
 168 {
 169         return (sim->bus_id);
 170 }
 171
 172 #endif /* _KERNEL */
 173 #endif /* _CAM_CAM_SIM_H */