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 * $FreeBSD: src/sys/cam/cam_sim.c,v 1.3 1999/08/28 00:40:42 peter Exp $ 29 * $DragonFly: src/sys/bus/cam/cam_sim.c,v 1.7 2004/09/17 02:20:53 joerg Exp $ 30 */ 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/malloc.h> 35 36 #include "cam.h" 37 #include "cam_ccb.h" 38 #include "cam_sim.h" 39 #include "cam_queue.h" 40 41 #define CAM_PATH_ANY (u_int32_t)-1 42 43 struct cam_devq * 44 cam_simq_alloc(u_int32_t max_sim_transactions) 45 { 46 return (cam_devq_alloc(/*size*/0, max_sim_transactions)); 47 } 48 49 void 50 cam_simq_release(struct cam_devq *devq) 51 { 52 cam_devq_release(devq); 53 } 54 55 /* 56 * cam_sim_alloc() may potentially be called from an interrupt (?) but 57 * unexpected things happen to the system if malloc() returns NULL so we 58 * use M_INTWAIT anyway. 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 int max_dev_transactions, 64 int max_tagged_dev_transactions, struct cam_devq *queue) 65 { 66 struct cam_sim *sim; 67 68 /* 69 * XXX ahd was limited to 256 instead of 512 for unknown reasons, 70 * move that to a global limit here. We may be able to remove this 71 * code, needs testing. 72 */ 73 if (max_dev_transactions > 256) 74 max_dev_transactions = 256; 75 if (max_tagged_dev_transactions > 256) 76 max_tagged_dev_transactions = 256; 77 78 /* 79 * Allocate a simq or use the supplied (possibly shared) simq. 80 */ 81 if (queue == NULL) 82 queue = cam_simq_alloc(max_tagged_dev_transactions); 83 else 84 cam_devq_reference(queue); 85 86 sim = malloc(sizeof(struct cam_sim), M_DEVBUF, M_INTWAIT | M_ZERO); 87 sim->sim_action = sim_action; 88 sim->sim_poll = sim_poll; 89 sim->sim_name = sim_name; 90 sim->softc = softc; 91 sim->path_id = CAM_PATH_ANY; 92 sim->unit_number = unit; 93 sim->bus_id = 0; /* set in xpt_bus_register */ 94 sim->max_tagged_dev_openings = max_tagged_dev_transactions; 95 sim->max_dev_openings = max_dev_transactions; 96 sim->flags = 0; 97 sim->refcount = 1; 98 callout_init(&sim->c_handle); 99 sim->devq = queue; 100 101 return (sim); 102 } 103 104 void 105 cam_sim_free(struct cam_sim *sim) 106 { 107 cam_sim_release(sim, CAM_SIM_DEVQ | CAM_SIM_SOFTC); 108 } 109 110 void 111 cam_sim_release(struct cam_sim *sim, int flags) 112 { 113 if (flags & CAM_SIM_SOFTC) 114 sim->softc = NULL; 115 if (flags & CAM_SIM_DEVQ) { 116 cam_simq_release(sim->devq); 117 sim->devq = NULL; 118 } 119 if (sim->refcount == 1) { 120 sim->refcount = 0; 121 free(sim, M_DEVBUF); 122 } else { 123 --sim->refcount; 124 } 125 } 126 127 void 128 cam_sim_set_path(struct cam_sim *sim, u_int32_t path_id) 129 { 130 sim->path_id = path_id; 131 } 132