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 | |