1 /*- 2 * Common functions 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 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/malloc.h> 35 #include <sys/kernel.h> 36 #include <sys/lock.h> 37 #include <sys/mutex.h> 38 39 #include <cam/cam.h> 40 #include <cam/cam_ccb.h> 41 #include <cam/cam_sim.h> 42 #include <cam/cam_queue.h> 43 44 #define CAM_PATH_ANY (u_int32_t)-1 45 46 static MALLOC_DEFINE(M_CAMSIM, "CAM SIM", "CAM SIM buffers"); 47 48 struct cam_devq * 49 cam_simq_alloc(u_int32_t max_sim_transactions) 50 { 51 return (cam_devq_alloc(/*size*/0, max_sim_transactions)); 52 } 53 54 void 55 cam_simq_free(struct cam_devq *devq) 56 { 57 cam_devq_free(devq); 58 } 59 60 struct cam_sim * 61 cam_sim_alloc(sim_action_func sim_action, sim_poll_func sim_poll, 62 const char *sim_name, void *softc, u_int32_t unit, 63 struct mtx *mtx, int max_dev_transactions, 64 int max_tagged_dev_transactions, struct cam_devq *queue) 65 { 66 struct cam_sim *sim; 67 68 if (mtx == NULL) 69 return (NULL); 70 71 sim = (struct cam_sim *)malloc(sizeof(struct cam_sim), 72 M_CAMSIM, M_ZERO | M_NOWAIT); 73 74 if (sim == NULL) 75 return (NULL); 76 77 sim->sim_action = sim_action; 78 sim->sim_poll = sim_poll; 79 sim->sim_name = sim_name; 80 sim->softc = softc; 81 sim->path_id = CAM_PATH_ANY; 82 sim->unit_number = unit; 83 sim->bus_id = 0; /* set in xpt_bus_register */ 84 sim->max_tagged_dev_openings = max_tagged_dev_transactions; 85 sim->max_dev_openings = max_dev_transactions; 86 sim->flags = 0; 87 sim->refcount = 1; 88 sim->devq = queue; 89 sim->max_ccbs = 8; /* Reserve for management purposes. */ 90 sim->mtx = mtx; 91 if (mtx == &Giant) { 92 sim->flags |= 0; 93 callout_init(&sim->callout, 0); 94 } else { 95 sim->flags |= CAM_SIM_MPSAFE; 96 callout_init(&sim->callout, 1); 97 } 98 99 SLIST_INIT(&sim->ccb_freeq); 100 TAILQ_INIT(&sim->sim_doneq); 101 102 return (sim); 103 } 104 105 void 106 cam_sim_free(struct cam_sim *sim, int free_devq) 107 { 108 int error; 109 110 sim->refcount--; 111 if (sim->refcount > 0) { 112 error = msleep(sim, sim->mtx, PRIBIO, "simfree", 0); 113 KASSERT(error == 0, ("invalid error value for msleep(9)")); 114 } 115 116 KASSERT(sim->refcount == 0, ("sim->refcount == 0")); 117 118 if (free_devq) 119 cam_simq_free(sim->devq); 120 free(sim, M_CAMSIM); 121 } 122 123 void 124 cam_sim_release(struct cam_sim *sim) 125 { 126 KASSERT(sim->refcount >= 1, ("sim->refcount >= 1")); 127 mtx_assert(sim->mtx, MA_OWNED); 128 129 sim->refcount--; 130 if (sim->refcount == 0) 131 wakeup(sim); 132 } 133 134 void 135 cam_sim_hold(struct cam_sim *sim) 136 { 137 KASSERT(sim->refcount >= 1, ("sim->refcount >= 1")); 138 mtx_assert(sim->mtx, MA_OWNED); 139 140 sim->refcount++; 141 } 142 143 void 144 cam_sim_set_path(struct cam_sim *sim, u_int32_t path_id) 145 { 146 sim->path_id = path_id; 147 } 148