| 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 | |