cam_sim.c revision 147723 
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: head/sys/cam/cam_sim.c 147723 2005-07-01 15:21:30Z avatar $");
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/malloc.h>
35#include <sys/kernel.h>
36
37#include <cam/cam.h>
38#include <cam/cam_ccb.h>
39#include <cam/cam_sim.h>
40#include <cam/cam_queue.h>
41
42#define CAM_PATH_ANY (u_int32_t)-1
43
44MALLOC_DEFINE(M_CAMSIM, "CAM SIM", "CAM SIM buffers");
45
46struct cam_devq *
47cam_simq_alloc(u_int32_t max_sim_transactions)
48{
49	return (cam_devq_alloc(/*size*/0, max_sim_transactions));
50}
51
52void
53cam_simq_free(struct cam_devq *devq)
54{
55	cam_devq_free(devq);
56}
57
58struct cam_sim *
59cam_sim_alloc(sim_action_func sim_action, sim_poll_func sim_poll,
60	      const char *sim_name, void *softc, u_int32_t unit,
61	      int max_dev_transactions,
62	      int max_tagged_dev_transactions, struct cam_devq *queue)
63{
64	struct cam_sim *sim;
65
66	/*
67	 * If this is the xpt layer creating a sim, then it's OK
68	 * to wait for an allocation.
69	 *
70	 * XXX Should we pass in a flag to indicate that wait is OK?
71	 */
72	if (strcmp(sim_name, "xpt") == 0)
73		sim = (struct cam_sim *)malloc(sizeof(struct cam_sim),
74					       M_CAMSIM, M_WAITOK);
75	else
76		sim = (struct cam_sim *)malloc(sizeof(struct cam_sim),
77					       M_CAMSIM, M_NOWAIT);
78
79	if (sim != NULL) {
80		sim->sim_action = sim_action;
81		sim->sim_poll = sim_poll;
82		sim->sim_name = sim_name;
83		sim->softc = softc;
84		sim->path_id = CAM_PATH_ANY;
85		sim->unit_number = unit;
86		sim->bus_id = 0;	/* set in xpt_bus_register */
87		sim->max_tagged_dev_openings = max_tagged_dev_transactions;
88		sim->max_dev_openings = max_dev_transactions;
89		sim->flags = 0;
90		callout_handle_init(&sim->c_handle);
91		sim->devq = queue;
92	}
93
94	return (sim);
95}
96
97void
98cam_sim_free(struct cam_sim *sim, int free_devq)
99{
100	if (free_devq)
101		cam_simq_free(sim->devq);
102	free(sim, M_CAMSIM);
103}
104
105void
106cam_sim_set_path(struct cam_sim *sim, u_int32_t path_id)
107{
108	sim->path_id = path_id;
109}
110