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
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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
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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 1.8 2006/09/05 00:55:31 dillon Exp $
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/malloc.h>
39 #include "cam_queue.h"
41 #define CAM_PATH_ANY (u_int32_t)-1
44 cam_simq_alloc(u_int32_t max_sim_transactions)
46 return (cam_devq_alloc(/*size*/0, max_sim_transactions));
50 cam_simq_release(struct cam_devq *devq)
52 cam_devq_release(devq);
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.
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)
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.
73 if (max_dev_transactions > 256)
74 max_dev_transactions = 256;
75 if (max_tagged_dev_transactions > 256)
76 max_tagged_dev_transactions = 256;
79 * Allocate a simq or use the supplied (possibly shared) simq.
82 queue = cam_simq_alloc(max_tagged_dev_transactions);
84 cam_devq_reference(queue);
86 sim = kmalloc(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;
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;
98 callout_init(&sim->c_handle);
105 cam_sim_free(struct cam_sim *sim)
107 cam_sim_release(sim, CAM_SIM_DEVQ | CAM_SIM_SOFTC);
111 cam_sim_release(struct cam_sim *sim, int flags)
113 if (flags & CAM_SIM_SOFTC)
115 if (flags & CAM_SIM_DEVQ) {
116 cam_simq_release(sim->devq);
119 if (sim->refcount == 1) {
121 kfree(sim, M_DEVBUF);
128 cam_sim_set_path(struct cam_sim *sim, u_int32_t path_id)
130 sim->path_id = path_id;