2 * Common functions for SCSI Interface Modules (SIMs).
4 * Copyright (c) 1997 Justin T. Gibbs.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
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 1.10 2007/12/01 22:21:17 pavalos Exp $
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/malloc.h>
35 #include <sys/kernel.h>
40 #include "cam_queue.h"
41 #include "cam_xpt_sim.h"
43 #define CAM_PATH_ANY (u_int32_t)-1
45 MALLOC_DEFINE(M_CAMSIM
, "CAM SIM", "CAM SIM buffers");
48 cam_simq_alloc(u_int32_t max_sim_transactions
)
50 return (cam_devq_alloc(/*size*/0, max_sim_transactions
));
54 cam_simq_release(struct cam_devq
*devq
)
56 cam_devq_release(devq
);
60 * cam_sim_alloc() may potentially be called from an interrupt (?) but
61 * unexpected things happen to the system if malloc() returns NULL so we
62 * use M_INTWAIT anyway.
65 cam_sim_alloc(sim_action_func sim_action
, sim_poll_func sim_poll
,
66 const char *sim_name
, void *softc
, u_int32_t unit
,
67 int max_dev_transactions
,
68 int max_tagged_dev_transactions
, struct cam_devq
*queue
)
73 * XXX ahd was limited to 256 instead of 512 for unknown reasons,
74 * move that to a global limit here. We may be able to remove this
75 * code, needs testing.
77 if (max_dev_transactions
> 256)
78 max_dev_transactions
= 256;
79 if (max_tagged_dev_transactions
> 256)
80 max_tagged_dev_transactions
= 256;
83 * Allocate a simq or use the supplied (possibly shared) simq.
86 queue
= cam_simq_alloc(max_tagged_dev_transactions
);
88 cam_devq_reference(queue
);
90 sim
= kmalloc(sizeof(struct cam_sim
), M_CAMSIM
, M_INTWAIT
| M_ZERO
);
91 sim
->sim_action
= sim_action
;
92 sim
->sim_poll
= sim_poll
;
93 sim
->sim_name
= sim_name
;
95 sim
->path_id
= CAM_PATH_ANY
;
96 sim
->unit_number
= unit
;
97 sim
->bus_id
= 0; /* set in xpt_bus_register */
98 sim
->max_tagged_dev_openings
= max_tagged_dev_transactions
;
99 sim
->max_dev_openings
= max_dev_transactions
;
102 callout_init(&sim
->c_handle
);
108 static void deadsim_poll(struct cam_sim
*sim
);
109 static void deadsim_action(struct cam_sim
*sim
, union ccb
*ccb
);
112 cam_sim_free(struct cam_sim
*sim
)
114 sim
->sim_action
= deadsim_action
;
115 sim
->sim_poll
= deadsim_poll
;
116 cam_sim_release(sim
, CAM_SIM_SOFTC
);
120 * Note: the devq is still used by individual peripherals even if the
121 * backend sim disappears, so do not destroy it until the sim itself
122 * is no longer needed.
125 cam_sim_release(struct cam_sim
*sim
, int flags
)
127 if (flags
& CAM_SIM_SOFTC
)
129 if (sim
->refcount
== 1) {
131 cam_simq_release(sim
->devq
);
135 kfree(sim
, M_CAMSIM
);
142 cam_sim_set_path(struct cam_sim
*sim
, u_int32_t path_id
)
144 sim
->path_id
= path_id
;
148 * Dead sim poll and action functions. The backend to the sim has gone
149 * away, aka usb, scsi device, etc... deal with it.
152 deadsim_poll(struct cam_sim
*sim
)
158 deadsim_action(struct cam_sim
*sim
, union ccb
*ccb
)
160 ccb
->ccb_h
.status
= CAM_TID_INVALID
;