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linux_module.c revision 1.1.2.1 
      1 /*	$NetBSD: linux_module.c,v 1.1.2.1 2014/03/04 20:45:17 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2014 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: linux_module.c,v 1.1.2.1 2014/03/04 20:45:17 riastradh Exp $");
     34 
     35 #include <sys/module.h>
     36 
     37 #include <linux/highmem.h>
     38 #include <linux/mutex.h>
     39 #include <linux/workqueue.h>
     40 
     41 MODULE(MODULE_CLASS_MISC, drmkms_linux, NULL);
     42 
     43 #ifndef _MODULE
     44 /*
     45  * XXX Mega-kludge.  See drm_init in drm_drv.c for details.
     46  */
     47 int linux_suppress_init = 0;
     48 #endif
     49 
     50 static int
     51 drmkms_linux_modcmd(modcmd_t cmd, void *arg __unused)
     52 {
     53 	int error;
     54 
     55 	switch (cmd) {
     56 	case MODULE_CMD_INIT:
     57 #ifndef _MODULE
     58 		if (linux_suppress_init)
     59 			return 0;
     60 #endif
     61 		error = linux_kmap_init();
     62 		if (error) {
     63 			aprint_error("drmkms_linux:"
     64 			    " unable to initialize linux kmap: %d",
     65 			    error);
     66 			goto init_fail0;
     67 		}
     68 		error = linux_workqueue_init();
     69 		if (error) {
     70 			aprint_error("drmkms_linux:"
     71 			    " unable to initialize workqueues: %d",
     72 			    error);
     73 			goto init_fail1;
     74 		}
     75 		return 0;
     76 
     77 init_fail1:	linux_kmap_fini();
     78 init_fail0:	return error;
     79 
     80 	case MODULE_CMD_FINI:
     81 		linux_workqueue_fini();
     82 		linux_kmap_fini();
     83 		return 0;
     84 
     85 	default:
     86 		return ENOTTY;
     87 	}
     88 }
     89