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/* $NetBSD: drm_sysctl.c,v 1.8 2021/12/19 11:36:57 riastradh Exp $ */
/*-
* Copyright (c) 2014 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: drm_sysctl.c,v 1.8 2021/12/19 11:36:57 riastradh Exp $");
#include <sys/param.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
/* We need to specify the type programmatically */
#undef sysctl_createv
#include <drm/drm_sysctl.h>
#ifdef SYSCTL_INCLUDE_DESCR
static const char *
drm_sysctl_get_description(const struct linux_module_param_info *p,
const struct drm_sysctl_def *def)
{
const void * const *b = def->bd, * const *e = def->ed;
for (; b < e; b++) {
const struct linux_module_param_desc *d = *b;
if (strcmp(p->dname, d->name) == 0)
return d->description;
}
return NULL;
}
#endif
#ifdef notyet
static uint64_t
drm_sysctl_get_value(const struct linux_module_param_info *p)
{
switch (p->type) {
case MTYPE_bool:
return *(bool *)p->ptr;
case MTYPE_int:
return *(int *)p->ptr;
case MTYPE_uint:
return *(unsigned *)p->ptr;
default:
aprint_error("unhandled module param type %d for %s\n",
p->type, p->name);
return 0;
}
}
static size_t
drm_sysctl_get_size(const struct linux_module_param_info *p)
{
switch (p->type) {
case MTYPE_bool:
return sizeof(bool);
case MTYPE_int:
return sizeof(int);
case MTYPE_uint:
return sizeof(unsigned);
default:
aprint_error("unhandled module param type %d for %s\n",
p->type, p->name);
return sizeof(void *);
}
}
#endif
static int
drm_sysctl_get_type(const struct linux_module_param_info *p)
{
switch (p->type) {
case MTYPE_bool:
return CTLTYPE_BOOL;
case MTYPE_int:
return CTLTYPE_INT;
case MTYPE_charp:
return CTLTYPE_STRING;
case MTYPE_uint:
return CTLTYPE_INT; /* XXX */
default:
aprint_error("unhandled module param type %d for %s\n",
p->type, p->name);
return CTLTYPE_NODE;
}
}
static int
drm_sysctl_node(const char *name, const struct sysctlnode **node,
struct sysctllog **log)
{
return sysctl_createv(log, 0, node, node,
CTLFLAG_PERMANENT, CTLTYPE_NODE, name, NULL,
NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL);
}
void
drm_sysctl_init(struct drm_sysctl_def *def)
{
const void * const *b = def->bp, * const *e = def->ep;
const struct sysctlnode *rnode = NULL, *cnode;
const char *name = "drm2";
int error;
if ((error = sysctl_createv(&def->log, 0, NULL, &rnode,
CTLFLAG_PERMANENT, CTLTYPE_NODE, name,
SYSCTL_DESCR("DRM driver parameters"),
NULL, 0, NULL, 0, CTL_HW, CTL_CREATE, CTL_EOL)) != 0) {
aprint_error("sysctl_createv returned %d, "
"for %s ignoring\n", error, name);
return;
}
for (; b < e; b++) {
const struct linux_module_param_info *p = *b;
char copy[256], *n, *nn;
strlcpy(copy, p->name, sizeof(copy));
cnode = rnode;
for (n = copy; (nn = strchr(n, '.')) != NULL; n = nn) {
*nn++ = '\0';
if ((error = drm_sysctl_node(n, &cnode, &def->log))
!= 0) {
aprint_error("sysctl_createv returned %d, "
"for %s ignoring\n", error, n);
continue;
}
}
if ((error = sysctl_createv(&def->log, 0, &cnode,
&cnode, p->mode == 0600 ? CTLFLAG_READWRITE : 0,
drm_sysctl_get_type(p), n,
SYSCTL_DESCR(drm_sysctl_get_description(p, def)),
NULL, 0, p->ptr, 0, CTL_CREATE, CTL_EOL)) != 0)
aprint_error("sysctl_createv returned %d, "
"for %s ignoring\n", error, n);
}
}
void
drm_sysctl_fini(struct drm_sysctl_def *def)
{
sysctl_teardown(&def->log);
}
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