dcdf6e7418
r249017: Some cosmetic things: - Unify device to target insertion inside xpt_alloc_device() instead of duplicating it three times. - Remove extra checks for empty lists of devices and targets on release since zero refcount check also implies it. - Reformat code to reduce indentation. r249103: - Add lock assertions to every point where reference counters are modified. - When reference counters are reaching zero, add assertions that there are no children items left. - Add a bit more locking to the xptpdperiphtraverse().
155 lines
4.0 KiB
C
155 lines
4.0 KiB
C
/*-
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* Common functions 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <cam/cam.h>
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#include <cam/cam_ccb.h>
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#include <cam/cam_sim.h>
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#include <cam/cam_queue.h>
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#include <cam/cam_xpt.h>
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#define CAM_PATH_ANY (u_int32_t)-1
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static MALLOC_DEFINE(M_CAMSIM, "CAM SIM", "CAM SIM buffers");
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struct cam_devq *
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cam_simq_alloc(u_int32_t max_sim_transactions)
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{
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return (cam_devq_alloc(/*size*/0, max_sim_transactions));
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}
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void
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cam_simq_free(struct cam_devq *devq)
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{
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cam_devq_free(devq);
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}
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struct cam_sim *
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cam_sim_alloc(sim_action_func sim_action, sim_poll_func sim_poll,
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const char *sim_name, void *softc, u_int32_t unit,
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struct mtx *mtx, int max_dev_transactions,
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int max_tagged_dev_transactions, struct cam_devq *queue)
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{
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struct cam_sim *sim;
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if (mtx == NULL)
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return (NULL);
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sim = (struct cam_sim *)malloc(sizeof(struct cam_sim),
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M_CAMSIM, M_ZERO | M_NOWAIT);
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if (sim == NULL)
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return (NULL);
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sim->sim_action = sim_action;
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sim->sim_poll = sim_poll;
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sim->sim_name = sim_name;
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sim->softc = softc;
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sim->path_id = CAM_PATH_ANY;
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sim->unit_number = unit;
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sim->bus_id = 0; /* set in xpt_bus_register */
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sim->max_tagged_dev_openings = max_tagged_dev_transactions;
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sim->max_dev_openings = max_dev_transactions;
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sim->flags = 0;
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sim->refcount = 1;
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sim->devq = queue;
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sim->max_ccbs = 8; /* Reserve for management purposes. */
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sim->mtx = mtx;
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if (mtx == &Giant) {
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sim->flags |= 0;
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callout_init(&sim->callout, 0);
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} else {
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sim->flags |= CAM_SIM_MPSAFE;
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callout_init(&sim->callout, 1);
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}
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SLIST_INIT(&sim->ccb_freeq);
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TAILQ_INIT(&sim->sim_doneq);
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return (sim);
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}
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void
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cam_sim_free(struct cam_sim *sim, int free_devq)
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{
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union ccb *ccb;
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int error;
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mtx_assert(sim->mtx, MA_OWNED);
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sim->refcount--;
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if (sim->refcount > 0) {
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error = msleep(sim, sim->mtx, PRIBIO, "simfree", 0);
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KASSERT(error == 0, ("invalid error value for msleep(9)"));
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}
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KASSERT(sim->refcount == 0, ("sim->refcount == 0"));
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while ((ccb = (union ccb *)SLIST_FIRST(&sim->ccb_freeq)) != NULL) {
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SLIST_REMOVE_HEAD(&sim->ccb_freeq, xpt_links.sle);
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xpt_free_ccb(ccb);
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}
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if (free_devq)
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cam_simq_free(sim->devq);
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free(sim, M_CAMSIM);
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}
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void
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cam_sim_release(struct cam_sim *sim)
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{
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KASSERT(sim->refcount >= 1, ("sim->refcount >= 1"));
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mtx_assert(sim->mtx, MA_OWNED);
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sim->refcount--;
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if (sim->refcount == 0)
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wakeup(sim);
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}
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void
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cam_sim_hold(struct cam_sim *sim)
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{
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KASSERT(sim->refcount >= 1, ("sim->refcount >= 1"));
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mtx_assert(sim->mtx, MA_OWNED);
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sim->refcount++;
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}
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void
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cam_sim_set_path(struct cam_sim *sim, u_int32_t path_id)
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{
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sim->path_id = path_id;
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}
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