diff options
Diffstat (limited to 'sys/cam/cam_sim.c')
| -rw-r--r-- | sys/cam/cam_sim.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/sys/cam/cam_sim.c b/sys/cam/cam_sim.c new file mode 100644 index 000000000000..e82332b999c3 --- /dev/null +++ b/sys/cam/cam_sim.c @@ -0,0 +1,188 @@ +/*- + * Common functions for SCSI Interface Modules (SIMs). + * + * SPDX-License-Identifier: BSD-2-Clause-FreeBSD + * + * Copyright (c) 1997 Justin T. Gibbs. + * 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, + * without modification, immediately at the beginning of the file. + * 2. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * 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. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/malloc.h> +#include <sys/kernel.h> +#include <sys/lock.h> +#include <sys/mutex.h> +#include <sys/bus.h> + +#include <cam/cam.h> +#include <cam/cam_ccb.h> +#include <cam/cam_sim.h> +#include <cam/cam_queue.h> +#include <cam/cam_xpt.h> + +#define CAM_PATH_ANY (u_int32_t)-1 + +static MALLOC_DEFINE(M_CAMSIM, "CAM SIM", "CAM SIM buffers"); + +static struct mtx cam_sim_free_mtx; +MTX_SYSINIT(cam_sim_free_init, &cam_sim_free_mtx, "CAM SIM free lock", MTX_DEF); + +struct cam_devq * +cam_simq_alloc(u_int32_t max_sim_transactions) +{ + return (cam_devq_alloc(/*size*/0, max_sim_transactions)); +} + +void +cam_simq_free(struct cam_devq *devq) +{ + cam_devq_free(devq); +} + +struct cam_sim * +cam_sim_alloc(sim_action_func sim_action, sim_poll_func sim_poll, + const char *sim_name, void *softc, u_int32_t unit, + struct mtx *mtx, int max_dev_transactions, + int max_tagged_dev_transactions, struct cam_devq *queue) +{ + struct cam_sim *sim; + + sim = malloc(sizeof(struct cam_sim), M_CAMSIM, M_ZERO | M_NOWAIT); + if (sim == NULL) + return (NULL); + + sim->sim_action = sim_action; + sim->sim_poll = sim_poll; + sim->sim_name = sim_name; + sim->softc = softc; + sim->path_id = CAM_PATH_ANY; + sim->sim_dev = NULL; /* set only by cam_sim_alloc_dev */ + sim->unit_number = unit; + sim->bus_id = 0; /* set in xpt_bus_register */ + sim->max_tagged_dev_openings = max_tagged_dev_transactions; + sim->max_dev_openings = max_dev_transactions; + sim->flags = 0; + sim->refcount = 1; + sim->devq = queue; + sim->mtx = mtx; + callout_init(&sim->callout, 1); + return (sim); +} + +struct cam_sim * +cam_sim_alloc_dev(sim_action_func sim_action, sim_poll_func sim_poll, + const char *sim_name, void *softc, device_t dev, + struct mtx *mtx, int max_dev_transactions, + int max_tagged_dev_transactions, struct cam_devq *queue) +{ + struct cam_sim *sim; + + KASSERT(dev != NULL, ("%s: dev is null for sim_name %s softc %p\n", + __func__, sim_name, softc)); + + sim = cam_sim_alloc(sim_action, sim_poll, sim_name, softc, + device_get_unit(dev), mtx, max_dev_transactions, + max_tagged_dev_transactions, queue); + if (sim != NULL) + sim->sim_dev = dev; + return (sim); +} + +void +cam_sim_free(struct cam_sim *sim, int free_devq) +{ + struct mtx *mtx; + int error; + + if (sim->mtx == NULL) { + mtx = &cam_sim_free_mtx; + mtx_lock(mtx); + } else { + mtx = sim->mtx; + mtx_assert(mtx, MA_OWNED); + } + KASSERT(sim->refcount >= 1, ("sim->refcount >= 1")); + sim->refcount--; + if (sim->refcount > 0) { + error = msleep(sim, mtx, PRIBIO, "simfree", 0); + KASSERT(error == 0, ("invalid error value for msleep(9)")); + } + KASSERT(sim->refcount == 0, ("sim->refcount == 0")); + if (mtx == &cam_sim_free_mtx) /* sim->mtx == NULL */ + mtx_unlock(mtx); + + if (free_devq) + cam_simq_free(sim->devq); + free(sim, M_CAMSIM); +} + +void +cam_sim_release(struct cam_sim *sim) +{ + struct mtx *mtx; + + if (sim->mtx == NULL) + mtx = &cam_sim_free_mtx; + else if (!mtx_owned(sim->mtx)) + mtx = sim->mtx; + else + mtx = NULL; /* We hold the lock. */ + if (mtx) + mtx_lock(mtx); + KASSERT(sim->refcount >= 1, ("sim->refcount >= 1")); + sim->refcount--; + if (sim->refcount == 0) + wakeup(sim); + if (mtx) + mtx_unlock(mtx); +} + +void +cam_sim_hold(struct cam_sim *sim) +{ + struct mtx *mtx; + + if (sim->mtx == NULL) + mtx = &cam_sim_free_mtx; + else if (!mtx_owned(sim->mtx)) + mtx = sim->mtx; + else + mtx = NULL; /* We hold the lock. */ + if (mtx) + mtx_lock(mtx); + KASSERT(sim->refcount >= 1, ("sim->refcount >= 1")); + sim->refcount++; + if (mtx) + mtx_unlock(mtx); +} + +void +cam_sim_set_path(struct cam_sim *sim, u_int32_t path_id) +{ + sim->path_id = path_id; +} |