1 /* $NetBSD: drm_sysctl.c,v 1.6 2015/07/30 04:36:48 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 Christos Zoulas. 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 #include <sys/cdefs.h> 32 __KERNEL_RCSID(0, "$NetBSD: drm_sysctl.c,v 1.6 2015/07/30 04:36:48 riastradh Exp $"); 33 34 #include <sys/param.h> 35 #include <sys/types.h> 36 #include <sys/systm.h> 37 #include <sys/sysctl.h> 38 #include <linux/module.h> 39 #include <linux/moduleparam.h> 40 /* We need to specify the type programmatically */ 41 #undef sysctl_createv 42 43 #include <drm/drm_sysctl.h> 44 45 #ifdef SYSCTL_INCLUDE_DESCR 46 static const char * 47 drm_sysctl_get_description(const struct linux_module_param_info *p, 48 const struct drm_sysctl_def *def) 49 { 50 const void * const *b = def->bd, * const *e = def->ed; 51 52 for (; b < e; b++) { 53 const struct linux_module_param_desc *d = *b; 54 if (strcmp(p->dname, d->name) == 0) 55 return d->description; 56 } 57 return NULL; 58 } 59 #endif 60 61 #ifdef notyet 62 static uint64_t 63 drm_sysctl_get_value(const struct linux_module_param_info *p) 64 { 65 switch (p->type) { 66 case MTYPE_bool: 67 return *(bool *)p->ptr; 68 case MTYPE_int: 69 return *(int *)p->ptr; 70 default: 71 aprint_error("unhandled module param type %d for %s\n", 72 p->type, p->name); 73 return 0; 74 } 75 } 76 77 static size_t 78 drm_sysctl_get_size(const struct linux_module_param_info *p) 79 { 80 switch (p->type) { 81 case MTYPE_bool: 82 return sizeof(bool); 83 case MTYPE_int: 84 return sizeof(int); 85 default: 86 aprint_error("unhandled module param type %d for %s\n", 87 p->type, p->name); 88 return sizeof(void *); 89 } 90 } 91 #endif 92 93 static int 94 drm_sysctl_get_type(const struct linux_module_param_info *p) 95 { 96 switch (p->type) { 97 case MTYPE_bool: 98 return CTLTYPE_BOOL; 99 case MTYPE_int: 100 return CTLTYPE_INT; 101 case MTYPE_charp: 102 return CTLTYPE_STRING; 103 default: 104 aprint_error("unhandled module param type %d for %s\n", 105 p->type, p->name); 106 return CTLTYPE_NODE; 107 } 108 } 109 110 111 static int 112 drm_sysctl_node(const char *name, const struct sysctlnode **node, 113 struct sysctllog **log) 114 { 115 return sysctl_createv(log, 0, node, node, 116 CTLFLAG_PERMANENT, CTLTYPE_NODE, name, NULL, 117 NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL); 118 } 119 120 121 void 122 drm_sysctl_init(struct drm_sysctl_def *def) 123 { 124 const void * const *b = def->bp, * const *e = def->ep; 125 const struct sysctlnode *rnode = NULL, *cnode; 126 const char *name = "drm2"; 127 128 int error; 129 if ((error = sysctl_createv(&def->log, 0, NULL, &rnode, 130 CTLFLAG_PERMANENT, CTLTYPE_NODE, name, 131 SYSCTL_DESCR("DRM driver parameters"), 132 NULL, 0, NULL, 0, CTL_HW, CTL_CREATE, CTL_EOL)) != 0) { 133 aprint_error("sysctl_createv returned %d, " 134 "for %s ignoring\n", error, name); 135 return; 136 } 137 138 for (; b < e; b++) { 139 const struct linux_module_param_info *p = *b; 140 char copy[256], *n, *nn; 141 strlcpy(copy, p->name, sizeof(copy)); 142 cnode = rnode; 143 for (n = copy; (nn = strchr(n, '.')) != NULL; n = nn) { 144 *nn++ = '\0'; 145 if ((error = drm_sysctl_node(n, &cnode, &def->log)) 146 != 0) { 147 aprint_error("sysctl_createv returned %d, " 148 "for %s ignoring\n", error, n); 149 continue; 150 } 151 } 152 153 if ((error = sysctl_createv(&def->log, 0, &cnode, 154 &cnode, p->mode == 0600 ? CTLFLAG_READWRITE : 0, 155 drm_sysctl_get_type(p), n, 156 SYSCTL_DESCR(drm_sysctl_get_description(p, def)), 157 NULL, 0, p->ptr, 0, CTL_CREATE, CTL_EOL)) != 0) 158 aprint_error("sysctl_createv returned %d, " 159 "for %s ignoring\n", error, n); 160 } 161 } 162 163 void 164 drm_sysctl_fini(struct drm_sysctl_def *def) 165 { 166 sysctl_teardown(&def->log); 167 } 168