cam_sim.c revision 111119 
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: head/sys/cam/cam_sim.c 111119 2003-02-19 05:47:46Z imp $
29 */
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/malloc.h>
34
35#include <cam/cam.h>
36#include <cam/cam_ccb.h>
37#include <cam/cam_sim.h>
38#include <cam/cam_queue.h>
39
40#define CAM_PATH_ANY (u_int32_t)-1
41
42struct cam_devq *
43cam_simq_alloc(u_int32_t max_sim_transactions)
44{
45	return (cam_devq_alloc(/*size*/0, max_sim_transactions));
46}
47
48void
49cam_simq_free(struct cam_devq *devq)
50{
51	cam_devq_free(devq);
52}
53
54struct cam_sim *
55cam_sim_alloc(sim_action_func sim_action, sim_poll_func sim_poll,
56	      const char *sim_name, void *softc, u_int32_t unit,
57	      int max_dev_transactions,
58	      int max_tagged_dev_transactions, struct cam_devq *queue)
59{
60	struct cam_sim *sim;
61
62	/*
63	 * If this is the xpt layer creating a sim, then it's OK
64	 * to wait for an allocation.
65	 *
66	 * XXX Should we pass in a flag to indicate that wait is OK?
67	 */
68	if (strcmp(sim_name, "xpt") == 0)
69		sim = (struct cam_sim *)malloc(sizeof(struct cam_sim),
70					       M_DEVBUF, M_WAITOK);
71	else
72		sim = (struct cam_sim *)malloc(sizeof(struct cam_sim),
73					       M_DEVBUF, M_NOWAIT);
74
75	if (sim != NULL) {
76		sim->sim_action = sim_action;
77		sim->sim_poll = sim_poll;
78		sim->sim_name = sim_name;
79		sim->softc = softc;
80		sim->path_id = CAM_PATH_ANY;
81		sim->unit_number = unit;
82		sim->bus_id = 0;	/* set in xpt_bus_register */
83		sim->max_tagged_dev_openings = max_tagged_dev_transactions;
84		sim->max_dev_openings = max_dev_transactions;
85		sim->flags = 0;
86		callout_handle_init(&sim->c_handle);
87		sim->devq = queue;
88	}
89
90	return (sim);
91}
92
93void
94cam_sim_free(struct cam_sim *sim, int free_devq)
95{
96	if (free_devq)
97		cam_simq_free(sim->devq);
98	free(sim, M_DEVBUF);
99}
100
101void
102cam_sim_set_path(struct cam_sim *sim, u_int32_t path_id)
103{
104	sim->path_id = path_id;
105}
106