2b83592fdc
use to synchornize and protect all data objects that are used for that SIM. Drivers that are not yet MPSAFE register Giant and operate as usual. RIght now, no drivers are MPSAFE, though a few will be changed in the coming week as this work settles down. The driver API has changed, so all CAM drivers will need to be recompiled. The userland API has not changed, so tools like camcontrol do not need to be recompiled.
153 lines
4.6 KiB
C
153 lines
4.6 KiB
C
/*-
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* Data structures and definitions for SCSI Interface Modules (SIMs).
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*
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* Copyright (c) 1997 Justin T. Gibbs.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification, immediately at the beginning of the file.
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* 2. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _CAM_CAM_SIM_H
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#define _CAM_CAM_SIM_H 1
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#ifdef _KERNEL
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/*
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* The sim driver creates a sim for each controller. The sim device
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* queue is separately created in order to allow resource sharing between
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* sims. For instance, a driver may create one sim for each channel of
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* a multi-channel controller and use the same queue for each channel.
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* In this way, the queue resources are shared across all the channels
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* of the multi-channel controller.
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*/
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struct cam_sim;
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struct cam_devq;
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typedef void (*sim_action_func)(struct cam_sim *sim, union ccb *ccb);
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typedef void (*sim_poll_func)(struct cam_sim *sim);
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struct cam_devq * cam_simq_alloc(u_int32_t max_sim_transactions);
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void cam_simq_free(struct cam_devq *devq);
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struct cam_sim * cam_sim_alloc(sim_action_func sim_action,
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sim_poll_func sim_poll,
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const char *sim_name,
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void *softc,
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u_int32_t unit,
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struct mtx *mtx,
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int max_dev_transactions,
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int max_tagged_dev_transactions,
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struct cam_devq *queue);
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void cam_sim_free(struct cam_sim *sim, int free_devq);
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/* Optional sim attributes may be set with these. */
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void cam_sim_set_path(struct cam_sim *sim, u_int32_t path_id);
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/* Convenience routines for accessing sim attributes. */
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static __inline u_int32_t cam_sim_path(struct cam_sim *sim);
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static __inline const char * cam_sim_name(struct cam_sim *sim);
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static __inline void * cam_sim_softc(struct cam_sim *sim);
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static __inline u_int32_t cam_sim_unit(struct cam_sim *sim);
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static __inline u_int32_t cam_sim_bus(struct cam_sim *sim);
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/* Generically useful offsets into the sim private area */
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#define spriv_ptr0 sim_priv.entries[0].ptr
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#define spriv_ptr1 sim_priv.entries[1].ptr
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#define spriv_field0 sim_priv.entries[0].field
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#define spriv_field1 sim_priv.entries[1].field
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/*
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* The sim driver should not access anything directly from this
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* structure.
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*/
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struct cam_sim {
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sim_action_func sim_action;
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sim_poll_func sim_poll;
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const char *sim_name;
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void *softc;
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struct mtx *mtx;
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u_int32_t path_id;/* The Boot device may set this to 0? */
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u_int32_t unit_number;
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u_int32_t bus_id;
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int max_tagged_dev_openings;
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int max_dev_openings;
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u_int32_t flags;
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#define CAM_SIM_REL_TIMEOUT_PENDING 0x01
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#define CAM_SIM_MPSAFE 0x02
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struct callout callout;
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struct cam_devq *devq; /* Device Queue to use for this SIM */
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/* "Pool" of inactive ccbs managed by xpt_alloc_ccb and xpt_free_ccb */
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SLIST_HEAD(,ccb_hdr) ccb_freeq;
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/*
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* Maximum size of ccb pool. Modified as devices are added/removed
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* or have their * opening counts changed.
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*/
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u_int max_ccbs;
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/* Current count of allocated ccbs */
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u_int ccb_count;
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};
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#define CAM_SIM_LOCK(sim) mtx_lock((sim)->mtx);
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#define CAM_SIM_UNLOCK(sim) mtx_unlock((sim)->mtx);
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static __inline u_int32_t
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cam_sim_path(struct cam_sim *sim)
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{
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return (sim->path_id);
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}
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static __inline const char *
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cam_sim_name(struct cam_sim *sim)
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{
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return (sim->sim_name);
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}
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static __inline void *
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cam_sim_softc(struct cam_sim *sim)
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{
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return (sim->softc);
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}
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static __inline u_int32_t
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cam_sim_unit(struct cam_sim *sim)
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{
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return (sim->unit_number);
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}
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static __inline u_int32_t
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cam_sim_bus(struct cam_sim *sim)
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{
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return (sim->bus_id);
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}
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#endif /* _KERNEL */
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#endif /* _CAM_CAM_SIM_H */
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