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drm_sysctl.c revision 1.2 
      1 /*-
      2  * Copyright (c) 2014 The NetBSD Foundation, Inc.
      3  * All rights reserved.
      4  *
      5  * This code is derived from software contributed to The NetBSD Foundation
      6  * by Christos Zoulas.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     19  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     20  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     21  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     27  * POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: drm_sysctl.c,v 1.2 2014/11/12 03:14:00 christos Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/types.h>
     34 #include <sys/systm.h>
     35 #include <sys/sysctl.h>
     36 #include <linux/module.h>
     37 #include <linux/moduleparam.h>
     38 /* We need to specify the type programmatically */
     39 #undef sysctl_createv
     40 
     41 #include <drm/drm_sysctl.h>
     42 
     43 static const char *
     44 drm_sysctl_get_description(const struct linux_module_param_info *p,
     45     const struct drm_sysctl_def *def)
     46 {
     47 	const void * const *b = def->bd, * const *e = def->ed;
     48 
     49 	for (; b < e; b++) {
     50 		const struct linux_module_param_desc *d = *b;
     51 		if (strcmp(p->name, d->name) == 0)
     52 			return d->description;
     53 	}
     54 	return NULL;
     55 }
     56 
     57 #ifdef notyet
     58 static uint64_t
     59 drm_sysctl_get_value(const struct linux_module_param_info *p)
     60 {
     61 	switch (p->type) {
     62 	case MTYPE_bool:
     63 		return *(bool *)p->ptr;
     64 	case MTYPE_int:
     65 		return *(int *)p->ptr;
     66 	default:
     67 		aprint_error("unhandled module param type %d for %s\n",
     68 		    p->type, p->name);
     69 		return 0;
     70 	}
     71 }
     72 
     73 static size_t
     74 drm_sysctl_get_size(const struct linux_module_param_info *p)
     75 {
     76 	switch (p->type) {
     77 	case MTYPE_bool:
     78 		return sizeof(bool);
     79 	case MTYPE_int:
     80 		return sizeof(int);
     81 	default:
     82 		aprint_error("unhandled module param type %d for %s\n",
     83 		    p->type, p->name);
     84 		return sizeof(void *);
     85 	}
     86 }
     87 #endif
     88 
     89 static int
     90 drm_sysctl_get_type(const struct linux_module_param_info *p)
     91 {
     92 	switch (p->type) {
     93 	case MTYPE_bool:
     94 		return CTLTYPE_BOOL;
     95 	case MTYPE_int:
     96 		return CTLTYPE_INT;
     97 	default:
     98 		aprint_error("unhandled module param type %d for %s\n",
     99 		    p->type, p->name);
    100 		return CTLTYPE_NODE;
    101 	}
    102 }
    103 
    104 
    105 static int
    106 drm_sysctl_node(const char *name, const struct sysctlnode **node,
    107     struct sysctllog **log)
    108 {
    109 	return sysctl_createv(log, 0, node, node,
    110 	    CTLFLAG_PERMANENT, CTLTYPE_NODE, name, NULL,
    111 	    NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL);
    112 }
    113 
    114 
    115 void
    116 drm_sysctl_init(struct drm_sysctl_def *def)
    117 {
    118 	const void * const *b = def->bp, * const *e = def->ep;
    119 	const struct sysctlnode *rnode = NULL, *cnode;
    120 	const char *name = "drm2";
    121 
    122 	int error;
    123 	if ((error = sysctl_createv(&def->log, 0, NULL, &rnode,
    124 	    CTLFLAG_PERMANENT, CTLTYPE_NODE, name,
    125 	    SYSCTL_DESCR("DRM driver parameters"),
    126 	    NULL, 0, NULL, 0, CTL_HW, CTL_CREATE, CTL_EOL)) != 0) {
    127 		aprint_error("sysctl_createv returned %d, "
    128 		    "for %s ignoring\n", error, name);
    129 		return;
    130 	}
    131 
    132 	for (; b < e; b++) {
    133 		const struct linux_module_param_info *p = *b;
    134 		char copy[256], *n, *nn;
    135 		strlcpy(copy, p->name, sizeof(copy));
    136 		cnode = rnode;
    137 		for (n = copy; (nn = strchr(n, '.')) != NULL; n = nn) {
    138 			*nn++ = '\0';
    139 			if ((error = drm_sysctl_node(n, &cnode, &def->log))
    140 			    != 0) {
    141 				aprint_error("sysctl_createv returned %d, "
    142 				    "for %s ignoring\n", error, n);
    143 				continue;
    144 			}
    145 		}
    146 
    147 	        if ((error = sysctl_createv(&def->log, 0, &cnode,
    148 		    &cnode, p->mode == 0600 ? CTLFLAG_READWRITE : 0,
    149 		    drm_sysctl_get_type(p), n,
    150 		    SYSCTL_DESCR(drm_sysctl_get_description(p, def)),
    151 		    NULL, 0, p->ptr, 0, CTL_CREATE, CTL_EOL)) != 0)
    152 			aprint_error("sysctl_createv returned %d, "
    153 			    "for %s ignoring\n", error, n);
    154 	}
    155 }
    156 
    157 void
    158 drm_sysctl_fini(struct drm_sysctl_def *def)
    159 {
    160 	sysctl_teardown(&def->log);
    161 }
    162