blob: c4a2b424599da85278d2284c9727c2aa37cfa1a0 [file] [log] [blame]
/**
* \file xf86drm.c
* User-level interface to DRM device
*
* \author Rickard E. (Rik) Faith <faith@valinux.com>
* \author Kevin E. Martin <martin@valinux.com>
*/
/*
* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <string.h>
#include <strings.h>
#include <ctype.h>
#include <dirent.h>
#include <stddef.h>
#include <fcntl.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#define stat_t struct stat
#include <sys/ioctl.h>
#include <sys/time.h>
#include <stdarg.h>
#ifdef MAJOR_IN_MKDEV
#include <sys/mkdev.h>
#endif
#ifdef MAJOR_IN_SYSMACROS
#include <sys/sysmacros.h>
#endif
#include <math.h>
#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
/* Not all systems have MAP_FAILED defined */
#ifndef MAP_FAILED
#define MAP_FAILED ((void *)-1)
#endif
#include "xf86drm.h"
#include "libdrm_macros.h"
#include "util_math.h"
#ifdef __OpenBSD__
#define DRM_PRIMARY_MINOR_NAME "drm"
#define DRM_CONTROL_MINOR_NAME "drmC"
#define DRM_RENDER_MINOR_NAME "drmR"
#else
#define DRM_PRIMARY_MINOR_NAME "card"
#define DRM_CONTROL_MINOR_NAME "controlD"
#define DRM_RENDER_MINOR_NAME "renderD"
#endif
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
#define DRM_MAJOR 145
#endif
#ifdef __NetBSD__
#define DRM_MAJOR 34
#endif
#ifdef __OpenBSD__
#ifdef __i386__
#define DRM_MAJOR 88
#else
#define DRM_MAJOR 87
#endif
#endif /* __OpenBSD__ */
#ifndef DRM_MAJOR
#define DRM_MAJOR 226 /* Linux */
#endif
#if defined(__OpenBSD__) || defined(__DragonFly__)
struct drm_pciinfo {
uint16_t domain;
uint8_t bus;
uint8_t dev;
uint8_t func;
uint16_t vendor_id;
uint16_t device_id;
uint16_t subvendor_id;
uint16_t subdevice_id;
uint8_t revision_id;
};
#define DRM_IOCTL_GET_PCIINFO DRM_IOR(0x15, struct drm_pciinfo)
#endif
#define DRM_MSG_VERBOSITY 3
#define memclear(s) memset(&s, 0, sizeof(s))
static drmServerInfoPtr drm_server_info;
drm_public void drmSetServerInfo(drmServerInfoPtr info)
{
drm_server_info = info;
}
/**
* Output a message to stderr.
*
* \param format printf() like format string.
*
* \internal
* This function is a wrapper around vfprintf().
*/
static int DRM_PRINTFLIKE(1, 0)
drmDebugPrint(const char *format, va_list ap)
{
return vfprintf(stderr, format, ap);
}
drm_public void
drmMsg(const char *format, ...)
{
va_list ap;
const char *env;
if (((env = getenv("LIBGL_DEBUG")) && strstr(env, "verbose")) ||
(drm_server_info && drm_server_info->debug_print))
{
va_start(ap, format);
if (drm_server_info) {
drm_server_info->debug_print(format,ap);
} else {
drmDebugPrint(format, ap);
}
va_end(ap);
}
}
static void *drmHashTable = NULL; /* Context switch callbacks */
drm_public void *drmGetHashTable(void)
{
return drmHashTable;
}
drm_public void *drmMalloc(int size)
{
return calloc(1, size);
}
drm_public void drmFree(void *pt)
{
free(pt);
}
/**
* Call ioctl, restarting if it is interupted
*/
drm_public int
drmIoctl(int fd, unsigned long request, void *arg)
{
int ret;
do {
ret = ioctl(fd, request, arg);
} while (ret == -1 && (errno == EINTR || errno == EAGAIN));
return ret;
}
static unsigned long drmGetKeyFromFd(int fd)
{
stat_t st;
st.st_rdev = 0;
fstat(fd, &st);
return st.st_rdev;
}
drm_public drmHashEntry *drmGetEntry(int fd)
{
unsigned long key = drmGetKeyFromFd(fd);
void *value;
drmHashEntry *entry;
if (!drmHashTable)
drmHashTable = drmHashCreate();
if (drmHashLookup(drmHashTable, key, &value)) {
entry = drmMalloc(sizeof(*entry));
entry->fd = fd;
entry->f = NULL;
entry->tagTable = drmHashCreate();
drmHashInsert(drmHashTable, key, entry);
} else {
entry = value;
}
return entry;
}
/**
* Compare two busid strings
*
* \param first
* \param second
*
* \return 1 if matched.
*
* \internal
* This function compares two bus ID strings. It understands the older
* PCI:b:d:f format and the newer pci:oooo:bb:dd.f format. In the format, o is
* domain, b is bus, d is device, f is function.
*/
static int drmMatchBusID(const char *id1, const char *id2, int pci_domain_ok)
{
/* First, check if the IDs are exactly the same */
if (strcasecmp(id1, id2) == 0)
return 1;
/* Try to match old/new-style PCI bus IDs. */
if (strncasecmp(id1, "pci", 3) == 0) {
unsigned int o1, b1, d1, f1;
unsigned int o2, b2, d2, f2;
int ret;
ret = sscanf(id1, "pci:%04x:%02x:%02x.%u", &o1, &b1, &d1, &f1);
if (ret != 4) {
o1 = 0;
ret = sscanf(id1, "PCI:%u:%u:%u", &b1, &d1, &f1);
if (ret != 3)
return 0;
}
ret = sscanf(id2, "pci:%04x:%02x:%02x.%u", &o2, &b2, &d2, &f2);
if (ret != 4) {
o2 = 0;
ret = sscanf(id2, "PCI:%u:%u:%u", &b2, &d2, &f2);
if (ret != 3)
return 0;
}
/* If domains aren't properly supported by the kernel interface,
* just ignore them, which sucks less than picking a totally random
* card with "open by name"
*/
if (!pci_domain_ok)
o1 = o2 = 0;
if ((o1 != o2) || (b1 != b2) || (d1 != d2) || (f1 != f2))
return 0;
else
return 1;
}
return 0;
}
/**
* Handles error checking for chown call.
*
* \param path to file.
* \param id of the new owner.
* \param id of the new group.
*
* \return zero if success or -1 if failure.
*
* \internal
* Checks for failure. If failure was caused by signal call chown again.
* If any other failure happened then it will output error mesage using
* drmMsg() call.
*/
#if !UDEV
static int chown_check_return(const char *path, uid_t owner, gid_t group)
{
int rv;
do {
rv = chown(path, owner, group);
} while (rv != 0 && errno == EINTR);
if (rv == 0)
return 0;
drmMsg("Failed to change owner or group for file %s! %d: %s\n",
path, errno, strerror(errno));
return -1;
}
#endif
/**
* Open the DRM device, creating it if necessary.
*
* \param dev major and minor numbers of the device.
* \param minor minor number of the device.
*
* \return a file descriptor on success, or a negative value on error.
*
* \internal
* Assembles the device name from \p minor and opens it, creating the device
* special file node with the major and minor numbers specified by \p dev and
* parent directory if necessary and was called by root.
*/
static int drmOpenDevice(dev_t dev, int minor, int type)
{
stat_t st;
const char *dev_name;
char buf[64];
int fd;
mode_t devmode = DRM_DEV_MODE, serv_mode;
gid_t serv_group;
#if !UDEV
int isroot = !geteuid();
uid_t user = DRM_DEV_UID;
gid_t group = DRM_DEV_GID;
#endif
switch (type) {
case DRM_NODE_PRIMARY:
dev_name = DRM_DEV_NAME;
break;
case DRM_NODE_CONTROL:
dev_name = DRM_CONTROL_DEV_NAME;
break;
case DRM_NODE_RENDER:
dev_name = DRM_RENDER_DEV_NAME;
break;
default:
return -EINVAL;
};
sprintf(buf, dev_name, DRM_DIR_NAME, minor);
drmMsg("drmOpenDevice: node name is %s\n", buf);
if (drm_server_info && drm_server_info->get_perms) {
drm_server_info->get_perms(&serv_group, &serv_mode);
devmode = serv_mode ? serv_mode : DRM_DEV_MODE;
devmode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
}
#if !UDEV
if (stat(DRM_DIR_NAME, &st)) {
if (!isroot)
return DRM_ERR_NOT_ROOT;
mkdir(DRM_DIR_NAME, DRM_DEV_DIRMODE);
chown_check_return(DRM_DIR_NAME, 0, 0); /* root:root */
chmod(DRM_DIR_NAME, DRM_DEV_DIRMODE);
}
/* Check if the device node exists and create it if necessary. */
if (stat(buf, &st)) {
if (!isroot)
return DRM_ERR_NOT_ROOT;
remove(buf);
mknod(buf, S_IFCHR | devmode, dev);
}
if (drm_server_info && drm_server_info->get_perms) {
group = ((int)serv_group >= 0) ? serv_group : DRM_DEV_GID;
chown_check_return(buf, user, group);
chmod(buf, devmode);
}
#else
/* if we modprobed then wait for udev */
{
int udev_count = 0;
wait_for_udev:
if (stat(DRM_DIR_NAME, &st)) {
usleep(20);
udev_count++;
if (udev_count == 50)
return -1;
goto wait_for_udev;
}
if (stat(buf, &st)) {
usleep(20);
udev_count++;
if (udev_count == 50)
return -1;
goto wait_for_udev;
}
}
#endif
fd = open(buf, O_RDWR | O_CLOEXEC, 0);
drmMsg("drmOpenDevice: open result is %d, (%s)\n",
fd, fd < 0 ? strerror(errno) : "OK");
if (fd >= 0)
return fd;
#if !UDEV
/* Check if the device node is not what we expect it to be, and recreate it
* and try again if so.
*/
if (st.st_rdev != dev) {
if (!isroot)
return DRM_ERR_NOT_ROOT;
remove(buf);
mknod(buf, S_IFCHR | devmode, dev);
if (drm_server_info && drm_server_info->get_perms) {
chown_check_return(buf, user, group);
chmod(buf, devmode);
}
}
fd = open(buf, O_RDWR | O_CLOEXEC, 0);
drmMsg("drmOpenDevice: open result is %d, (%s)\n",
fd, fd < 0 ? strerror(errno) : "OK");
if (fd >= 0)
return fd;
drmMsg("drmOpenDevice: Open failed\n");
remove(buf);
#endif
return -errno;
}
/**
* Open the DRM device
*
* \param minor device minor number.
* \param create allow to create the device if set.
*
* \return a file descriptor on success, or a negative value on error.
*
* \internal
* Calls drmOpenDevice() if \p create is set, otherwise assembles the device
* name from \p minor and opens it.
*/
static int drmOpenMinor(int minor, int create, int type)
{
int fd;
char buf[64];
const char *dev_name;
if (create)
return drmOpenDevice(makedev(DRM_MAJOR, minor), minor, type);
switch (type) {
case DRM_NODE_PRIMARY:
dev_name = DRM_DEV_NAME;
break;
case DRM_NODE_CONTROL:
dev_name = DRM_CONTROL_DEV_NAME;
break;
case DRM_NODE_RENDER:
dev_name = DRM_RENDER_DEV_NAME;
break;
default:
return -EINVAL;
};
sprintf(buf, dev_name, DRM_DIR_NAME, minor);
if ((fd = open(buf, O_RDWR | O_CLOEXEC, 0)) >= 0)
return fd;
return -errno;
}
/**
* Determine whether the DRM kernel driver has been loaded.
*
* \return 1 if the DRM driver is loaded, 0 otherwise.
*
* \internal
* Determine the presence of the kernel driver by attempting to open the 0
* minor and get version information. For backward compatibility with older
* Linux implementations, /proc/dri is also checked.
*/
drm_public int drmAvailable(void)
{
drmVersionPtr version;
int retval = 0;
int fd;
if ((fd = drmOpenMinor(0, 1, DRM_NODE_PRIMARY)) < 0) {
#ifdef __linux__
/* Try proc for backward Linux compatibility */
if (!access("/proc/dri/0", R_OK))
return 1;
#endif
return 0;
}
if ((version = drmGetVersion(fd))) {
retval = 1;
drmFreeVersion(version);
}
close(fd);
return retval;
}
static int drmGetMinorBase(int type)
{
switch (type) {
case DRM_NODE_PRIMARY:
return 0;
case DRM_NODE_CONTROL:
return 64;
case DRM_NODE_RENDER:
return 128;
default:
return -1;
};
}
static int drmGetMinorType(int minor)
{
int type = minor >> 6;
if (minor < 0)
return -1;
switch (type) {
case DRM_NODE_PRIMARY:
case DRM_NODE_CONTROL:
case DRM_NODE_RENDER:
return type;
default:
return -1;
}
}
static const char *drmGetMinorName(int type)
{
switch (type) {
case DRM_NODE_PRIMARY:
return DRM_PRIMARY_MINOR_NAME;
case DRM_NODE_CONTROL:
return DRM_CONTROL_MINOR_NAME;
case DRM_NODE_RENDER:
return DRM_RENDER_MINOR_NAME;
default:
return NULL;
}
}
/**
* Open the device by bus ID.
*
* \param busid bus ID.
* \param type device node type.
*
* \return a file descriptor on success, or a negative value on error.
*
* \internal
* This function attempts to open every possible minor (up to DRM_MAX_MINOR),
* comparing the device bus ID with the one supplied.
*
* \sa drmOpenMinor() and drmGetBusid().
*/
static int drmOpenByBusid(const char *busid, int type)
{
int i, pci_domain_ok = 1;
int fd;
const char *buf;
drmSetVersion sv;
int base = drmGetMinorBase(type);
if (base < 0)
return -1;
drmMsg("drmOpenByBusid: Searching for BusID %s\n", busid);
for (i = base; i < base + DRM_MAX_MINOR; i++) {
fd = drmOpenMinor(i, 1, type);
drmMsg("drmOpenByBusid: drmOpenMinor returns %d\n", fd);
if (fd >= 0) {
/* We need to try for 1.4 first for proper PCI domain support
* and if that fails, we know the kernel is busted
*/
sv.drm_di_major = 1;
sv.drm_di_minor = 4;
sv.drm_dd_major = -1; /* Don't care */
sv.drm_dd_minor = -1; /* Don't care */
if (drmSetInterfaceVersion(fd, &sv)) {
#ifndef __alpha__
pci_domain_ok = 0;
#endif
sv.drm_di_major = 1;
sv.drm_di_minor = 1;
sv.drm_dd_major = -1; /* Don't care */
sv.drm_dd_minor = -1; /* Don't care */
drmMsg("drmOpenByBusid: Interface 1.4 failed, trying 1.1\n");
drmSetInterfaceVersion(fd, &sv);
}
buf = drmGetBusid(fd);
drmMsg("drmOpenByBusid: drmGetBusid reports %s\n", buf);
if (buf && drmMatchBusID(buf, busid, pci_domain_ok)) {
drmFreeBusid(buf);
return fd;
}
if (buf)
drmFreeBusid(buf);
close(fd);
}
}
return -1;
}
/**
* Open the device by name.
*
* \param name driver name.
* \param type the device node type.
*
* \return a file descriptor on success, or a negative value on error.
*
* \internal
* This function opens the first minor number that matches the driver name and
* isn't already in use. If it's in use it then it will already have a bus ID
* assigned.
*
* \sa drmOpenMinor(), drmGetVersion() and drmGetBusid().
*/
static int drmOpenByName(const char *name, int type)
{
int i;
int fd;
drmVersionPtr version;
char * id;
int base = drmGetMinorBase(type);
if (base < 0)
return -1;
/*
* Open the first minor number that matches the driver name and isn't
* already in use. If it's in use it will have a busid assigned already.
*/
for (i = base; i < base + DRM_MAX_MINOR; i++) {
if ((fd = drmOpenMinor(i, 1, type)) >= 0) {
if ((version = drmGetVersion(fd))) {
if (!strcmp(version->name, name)) {
drmFreeVersion(version);
id = drmGetBusid(fd);
drmMsg("drmGetBusid returned '%s'\n", id ? id : "NULL");
if (!id || !*id) {
if (id)
drmFreeBusid(id);
return fd;
} else {
drmFreeBusid(id);
}
} else {
drmFreeVersion(version);
}
}
close(fd);
}
}
#ifdef __linux__
/* Backward-compatibility /proc support */
for (i = 0; i < 8; i++) {
char proc_name[64], buf[512];
char *driver, *pt, *devstring;
int retcode;
sprintf(proc_name, "/proc/dri/%d/name", i);
if ((fd = open(proc_name, 0, 0)) >= 0) {
retcode = read(fd, buf, sizeof(buf)-1);
close(fd);
if (retcode) {
buf[retcode-1] = '\0';
for (driver = pt = buf; *pt && *pt != ' '; ++pt)
;
if (*pt) { /* Device is next */
*pt = '\0';
if (!strcmp(driver, name)) { /* Match */
for (devstring = ++pt; *pt && *pt != ' '; ++pt)
;
if (*pt) { /* Found busid */
return drmOpenByBusid(++pt, type);
} else { /* No busid */
return drmOpenDevice(strtol(devstring, NULL, 0),i, type);
}
}
}
}
}
}
#endif
return -1;
}
/**
* Open the DRM device.
*
* Looks up the specified name and bus ID, and opens the device found. The
* entry in /dev/dri is created if necessary and if called by root.
*
* \param name driver name. Not referenced if bus ID is supplied.
* \param busid bus ID. Zero if not known.
*
* \return a file descriptor on success, or a negative value on error.
*
* \internal
* It calls drmOpenByBusid() if \p busid is specified or drmOpenByName()
* otherwise.
*/
drm_public int drmOpen(const char *name, const char *busid)
{
return drmOpenWithType(name, busid, DRM_NODE_PRIMARY);
}
/**
* Open the DRM device with specified type.
*
* Looks up the specified name and bus ID, and opens the device found. The
* entry in /dev/dri is created if necessary and if called by root.
*
* \param name driver name. Not referenced if bus ID is supplied.
* \param busid bus ID. Zero if not known.
* \param type the device node type to open, PRIMARY, CONTROL or RENDER
*
* \return a file descriptor on success, or a negative value on error.
*
* \internal
* It calls drmOpenByBusid() if \p busid is specified or drmOpenByName()
* otherwise.
*/
drm_public int drmOpenWithType(const char *name, const char *busid, int type)
{
if (!drmAvailable() && name != NULL && drm_server_info &&
drm_server_info->load_module) {
/* try to load the kernel module */
if (!drm_server_info->load_module(name)) {
drmMsg("[drm] failed to load kernel module \"%s\"\n", name);
return -1;
}
}
if (busid) {
int fd = drmOpenByBusid(busid, type);
if (fd >= 0)
return fd;
}
if (name)
return drmOpenByName(name, type);
return -1;
}
drm_public int drmOpenControl(int minor)
{
return drmOpenMinor(minor, 0, DRM_NODE_CONTROL);
}
drm_public int drmOpenRender(int minor)
{
return drmOpenMinor(minor, 0, DRM_NODE_RENDER);
}
/**
* Free the version information returned by drmGetVersion().
*
* \param v pointer to the version information.
*
* \internal
* It frees the memory pointed by \p %v as well as all the non-null strings
* pointers in it.
*/
drm_public void drmFreeVersion(drmVersionPtr v)
{
if (!v)
return;
drmFree(v->name);
drmFree(v->date);
drmFree(v->desc);
drmFree(v);
}
/**
* Free the non-public version information returned by the kernel.
*
* \param v pointer to the version information.
*
* \internal
* Used by drmGetVersion() to free the memory pointed by \p %v as well as all
* the non-null strings pointers in it.
*/
static void drmFreeKernelVersion(drm_version_t *v)
{
if (!v)
return;
drmFree(v->name);
drmFree(v->date);
drmFree(v->desc);
drmFree(v);
}
/**
* Copy version information.
*
* \param d destination pointer.
* \param s source pointer.
*
* \internal
* Used by drmGetVersion() to translate the information returned by the ioctl
* interface in a private structure into the public structure counterpart.
*/
static void drmCopyVersion(drmVersionPtr d, const drm_version_t *s)
{
d->version_major = s->version_major;
d->version_minor = s->version_minor;
d->version_patchlevel = s->version_patchlevel;
d->name_len = s->name_len;
d->name = strdup(s->name);
d->date_len = s->date_len;
d->date = strdup(s->date);
d->desc_len = s->desc_len;
d->desc = strdup(s->desc);
}
/**
* Query the driver version information.
*
* \param fd file descriptor.
*
* \return pointer to a drmVersion structure which should be freed with
* drmFreeVersion().
*
* \note Similar information is available via /proc/dri.
*
* \internal
* It gets the version information via successive DRM_IOCTL_VERSION ioctls,
* first with zeros to get the string lengths, and then the actually strings.
* It also null-terminates them since they might not be already.
*/
drm_public drmVersionPtr drmGetVersion(int fd)
{
drmVersionPtr retval;
drm_version_t *version = drmMalloc(sizeof(*version));
if (drmIoctl(fd, DRM_IOCTL_VERSION, version)) {
drmFreeKernelVersion(version);
return NULL;
}
if (version->name_len)
version->name = drmMalloc(version->name_len + 1);
if (version->date_len)
version->date = drmMalloc(version->date_len + 1);
if (version->desc_len)
version->desc = drmMalloc(version->desc_len + 1);
if (drmIoctl(fd, DRM_IOCTL_VERSION, version)) {
drmMsg("DRM_IOCTL_VERSION: %s\n", strerror(errno));
drmFreeKernelVersion(version);
return NULL;
}
/* The results might not be null-terminated strings, so terminate them. */
if (version->name_len) version->name[version->name_len] = '\0';
if (version->date_len) version->date[version->date_len] = '\0';
if (version->desc_len) version->desc[version->desc_len] = '\0';
retval = drmMalloc(sizeof(*retval));
drmCopyVersion(retval, version);
drmFreeKernelVersion(version);
return retval;
}
/**
* Get version information for the DRM user space library.
*
* This version number is driver independent.
*
* \param fd file descriptor.
*
* \return version information.
*
* \internal
* This function allocates and fills a drm_version structure with a hard coded
* version number.
*/
drm_public drmVersionPtr drmGetLibVersion(int fd)
{
drm_version_t *version = drmMalloc(sizeof(*version));
/* Version history:
* NOTE THIS MUST NOT GO ABOVE VERSION 1.X due to drivers needing it
* revision 1.0.x = original DRM interface with no drmGetLibVersion
* entry point and many drm<Device> extensions
* revision 1.1.x = added drmCommand entry points for device extensions
* added drmGetLibVersion to identify libdrm.a version
* revision 1.2.x = added drmSetInterfaceVersion
* modified drmOpen to handle both busid and name
* revision 1.3.x = added server + memory manager
*/
version->version_major = 1;
version->version_minor = 3;
version->version_patchlevel = 0;
return (drmVersionPtr)version;
}
drm_public int drmGetCap(int fd, uint64_t capability, uint64_t *value)
{
struct drm_get_cap cap;
int ret;
memclear(cap);
cap.capability = capability;
ret = drmIoctl(fd, DRM_IOCTL_GET_CAP, &cap);
if (ret)
return ret;
*value = cap.value;
return 0;
}
drm_public int drmSetClientCap(int fd, uint64_t capability, uint64_t value)
{
struct drm_set_client_cap cap;
memclear(cap);
cap.capability = capability;
cap.value = value;
return drmIoctl(fd, DRM_IOCTL_SET_CLIENT_CAP, &cap);
}
/**
* Free the bus ID information.
*
* \param busid bus ID information string as given by drmGetBusid().
*
* \internal
* This function is just frees the memory pointed by \p busid.
*/
drm_public void drmFreeBusid(const char *busid)
{
drmFree((void *)busid);
}
/**
* Get the bus ID of the device.
*
* \param fd file descriptor.
*
* \return bus ID string.
*
* \internal
* This function gets the bus ID via successive DRM_IOCTL_GET_UNIQUE ioctls to
* get the string length and data, passing the arguments in a drm_unique
* structure.
*/
drm_public char *drmGetBusid(int fd)
{
drm_unique_t u;
memclear(u);
if (drmIoctl(fd, DRM_IOCTL_GET_UNIQUE, &u))
return NULL;
u.unique = drmMalloc(u.unique_len + 1);
if (drmIoctl(fd, DRM_IOCTL_GET_UNIQUE, &u)) {
drmFree(u.unique);
return NULL;
}
u.unique[u.unique_len] = '\0';
return u.unique;
}
/**
* Set the bus ID of the device.
*
* \param fd file descriptor.
* \param busid bus ID string.
*
* \return zero on success, negative on failure.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_SET_UNIQUE ioctl, passing
* the arguments in a drm_unique structure.
*/
drm_public int drmSetBusid(int fd, const char *busid)
{
drm_unique_t u;
memclear(u);
u.unique = (char *)busid;
u.unique_len = strlen(busid);
if (drmIoctl(fd, DRM_IOCTL_SET_UNIQUE, &u)) {
return -errno;
}
return 0;
}
drm_public int drmGetMagic(int fd, drm_magic_t * magic)
{
drm_auth_t auth;
memclear(auth);
*magic = 0;
if (drmIoctl(fd, DRM_IOCTL_GET_MAGIC, &auth))
return -errno;
*magic = auth.magic;
return 0;
}
drm_public int drmAuthMagic(int fd, drm_magic_t magic)
{
drm_auth_t auth;
memclear(auth);
auth.magic = magic;
if (drmIoctl(fd, DRM_IOCTL_AUTH_MAGIC, &auth))
return -errno;
return 0;
}
/**
* Specifies a range of memory that is available for mapping by a
* non-root process.
*
* \param fd file descriptor.
* \param offset usually the physical address. The actual meaning depends of
* the \p type parameter. See below.
* \param size of the memory in bytes.
* \param type type of the memory to be mapped.
* \param flags combination of several flags to modify the function actions.
* \param handle will be set to a value that may be used as the offset
* parameter for mmap().
*
* \return zero on success or a negative value on error.
*
* \par Mapping the frame buffer
* For the frame buffer
* - \p offset will be the physical address of the start of the frame buffer,
* - \p size will be the size of the frame buffer in bytes, and
* - \p type will be DRM_FRAME_BUFFER.
*
* \par
* The area mapped will be uncached. If MTRR support is available in the
* kernel, the frame buffer area will be set to write combining.
*
* \par Mapping the MMIO register area
* For the MMIO register area,
* - \p offset will be the physical address of the start of the register area,
* - \p size will be the size of the register area bytes, and
* - \p type will be DRM_REGISTERS.
* \par
* The area mapped will be uncached.
*
* \par Mapping the SAREA
* For the SAREA,
* - \p offset will be ignored and should be set to zero,
* - \p size will be the desired size of the SAREA in bytes,
* - \p type will be DRM_SHM.
*
* \par
* A shared memory area of the requested size will be created and locked in
* kernel memory. This area may be mapped into client-space by using the handle
* returned.
*
* \note May only be called by root.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_ADD_MAP ioctl, passing
* the arguments in a drm_map structure.
*/
drm_public int drmAddMap(int fd, drm_handle_t offset, drmSize size, drmMapType type,
drmMapFlags flags, drm_handle_t *handle)
{
drm_map_t map;
memclear(map);
map.offset = offset;
map.size = size;
map.type = type;
map.flags = flags;
if (drmIoctl(fd, DRM_IOCTL_ADD_MAP, &map))
return -errno;
if (handle)
*handle = (drm_handle_t)(uintptr_t)map.handle;
return 0;
}
drm_public int drmRmMap(int fd, drm_handle_t handle)
{
drm_map_t map;
memclear(map);
map.handle = (void *)(uintptr_t)handle;
if(drmIoctl(fd, DRM_IOCTL_RM_MAP, &map))
return -errno;
return 0;
}
/**
* Make buffers available for DMA transfers.
*
* \param fd file descriptor.
* \param count number of buffers.
* \param size size of each buffer.
* \param flags buffer allocation flags.
* \param agp_offset offset in the AGP aperture
*
* \return number of buffers allocated, negative on error.
*
* \internal
* This function is a wrapper around DRM_IOCTL_ADD_BUFS ioctl.
*
* \sa drm_buf_desc.
*/
drm_public int drmAddBufs(int fd, int count, int size, drmBufDescFlags flags,
int agp_offset)
{
drm_buf_desc_t request;
memclear(request);
request.count = count;
request.size = size;
request.flags = flags;
request.agp_start = agp_offset;
if (drmIoctl(fd, DRM_IOCTL_ADD_BUFS, &request))
return -errno;
return request.count;
}
drm_public int drmMarkBufs(int fd, double low, double high)
{
drm_buf_info_t info;
int i;
memclear(info);
if (drmIoctl(fd, DRM_IOCTL_INFO_BUFS, &info))
return -EINVAL;
if (!info.count)
return -EINVAL;
if (!(info.list = drmMalloc(info.count * sizeof(*info.list))))
return -ENOMEM;
if (drmIoctl(fd, DRM_IOCTL_INFO_BUFS, &info)) {
int retval = -errno;
drmFree(info.list);
return retval;
}
for (i = 0; i < info.count; i++) {
info.list[i].low_mark = low * info.list[i].count;
info.list[i].high_mark = high * info.list[i].count;
if (drmIoctl(fd, DRM_IOCTL_MARK_BUFS, &info.list[i])) {
int retval = -errno;
drmFree(info.list);
return retval;
}
}
drmFree(info.list);
return 0;
}
/**
* Free buffers.
*
* \param fd file descriptor.
* \param count number of buffers to free.
* \param list list of buffers to be freed.
*
* \return zero on success, or a negative value on failure.
*
* \note This function is primarily used for debugging.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_FREE_BUFS ioctl, passing
* the arguments in a drm_buf_free structure.
*/
drm_public int drmFreeBufs(int fd, int count, int *list)
{
drm_buf_free_t request;
memclear(request);
request.count = count;
request.list = list;
if (drmIoctl(fd, DRM_IOCTL_FREE_BUFS, &request))
return -errno;
return 0;
}
/**
* Close the device.
*
* \param fd file descriptor.
*
* \internal
* This function closes the file descriptor.
*/
drm_public int drmClose(int fd)
{
unsigned long key = drmGetKeyFromFd(fd);
drmHashEntry *entry = drmGetEntry(fd);
drmHashDestroy(entry->tagTable);
entry->fd = 0;
entry->f = NULL;
entry->tagTable = NULL;
drmHashDelete(drmHashTable, key);
drmFree(entry);
return close(fd);
}
/**
* Map a region of memory.
*
* \param fd file descriptor.
* \param handle handle returned by drmAddMap().
* \param size size in bytes. Must match the size used by drmAddMap().
* \param address will contain the user-space virtual address where the mapping
* begins.
*
* \return zero on success, or a negative value on failure.
*
* \internal
* This function is a wrapper for mmap().
*/
drm_public int drmMap(int fd, drm_handle_t handle, drmSize size,
drmAddressPtr address)
{
static unsigned long pagesize_mask = 0;
if (fd < 0)
return -EINVAL;
if (!pagesize_mask)
pagesize_mask = getpagesize() - 1;
size = (size + pagesize_mask) & ~pagesize_mask;
*address = drm_mmap(0, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, handle);
if (*address == MAP_FAILED)
return -errno;
return 0;
}
/**
* Unmap mappings obtained with drmMap().
*
* \param address address as given by drmMap().
* \param size size in bytes. Must match the size used by drmMap().
*
* \return zero on success, or a negative value on failure.
*
* \internal
* This function is a wrapper for munmap().
*/
drm_public int drmUnmap(drmAddress address, drmSize size)
{
return drm_munmap(address, size);
}
drm_public drmBufInfoPtr drmGetBufInfo(int fd)
{
drm_buf_info_t info;
drmBufInfoPtr retval;
int i;
memclear(info);
if (drmIoctl(fd, DRM_IOCTL_INFO_BUFS, &info))
return NULL;
if (info.count) {
if (!(info.list = drmMalloc(info.count * sizeof(*info.list))))
return NULL;
if (drmIoctl(fd, DRM_IOCTL_INFO_BUFS, &info)) {
drmFree(info.list);
return NULL;
}
retval = drmMalloc(sizeof(*retval));
retval->count = info.count;
retval->list = drmMalloc(info.count * sizeof(*retval->list));
for (i = 0; i < info.count; i++) {
retval->list[i].count = info.list[i].count;
retval->list[i].size = info.list[i].size;
retval->list[i].low_mark = info.list[i].low_mark;
retval->list[i].high_mark = info.list[i].high_mark;
}
drmFree(info.list);
return retval;
}
return NULL;
}
/**
* Map all DMA buffers into client-virtual space.
*
* \param fd file descriptor.
*
* \return a pointer to a ::drmBufMap structure.
*
* \note The client may not use these buffers until obtaining buffer indices
* with drmDMA().
*
* \internal
* This function calls the DRM_IOCTL_MAP_BUFS ioctl and copies the returned
* information about the buffers in a drm_buf_map structure into the
* client-visible data structures.
*/
drm_public drmBufMapPtr drmMapBufs(int fd)
{
drm_buf_map_t bufs;
drmBufMapPtr retval;
int i;
memclear(bufs);
if (drmIoctl(fd, DRM_IOCTL_MAP_BUFS, &bufs))
return NULL;
if (!bufs.count)
return NULL;
if (!(bufs.list = drmMalloc(bufs.count * sizeof(*bufs.list))))
return NULL;
if (drmIoctl(fd, DRM_IOCTL_MAP_BUFS, &bufs)) {
drmFree(bufs.list);
return NULL;
}
retval = drmMalloc(sizeof(*retval));
retval->count = bufs.count;
retval->list = drmMalloc(bufs.count * sizeof(*retval->list));
for (i = 0; i < bufs.count; i++) {
retval->list[i].idx = bufs.list[i].idx;
retval->list[i].total = bufs.list[i].total;
retval->list[i].used = 0;
retval->list[i].address = bufs.list[i].address;
}
drmFree(bufs.list);
return retval;
}
/**
* Unmap buffers allocated with drmMapBufs().
*
* \return zero on success, or negative value on failure.
*
* \internal
* Calls munmap() for every buffer stored in \p bufs and frees the
* memory allocated by drmMapBufs().
*/
drm_public int drmUnmapBufs(drmBufMapPtr bufs)
{
int i;
for (i = 0; i < bufs->count; i++) {
drm_munmap(bufs->list[i].address, bufs->list[i].total);
}
drmFree(bufs->list);
drmFree(bufs);
return 0;
}
#define DRM_DMA_RETRY 16
/**
* Reserve DMA buffers.
*
* \param fd file descriptor.
* \param request
*
* \return zero on success, or a negative value on failure.
*
* \internal
* Assemble the arguments into a drm_dma structure and keeps issuing the
* DRM_IOCTL_DMA ioctl until success or until maximum number of retries.
*/
drm_public int drmDMA(int fd, drmDMAReqPtr request)
{
drm_dma_t dma;
int ret, i = 0;
dma.context = request->context;
dma.send_count = request->send_count;
dma.send_indices = request->send_list;
dma.send_sizes = request->send_sizes;
dma.flags = request->flags;
dma.request_count = request->request_count;
dma.request_size = request->request_size;
dma.request_indices = request->request_list;
dma.request_sizes = request->request_sizes;
dma.granted_count = 0;
do {
ret = ioctl( fd, DRM_IOCTL_DMA, &dma );
} while ( ret && errno == EAGAIN && i++ < DRM_DMA_RETRY );
if ( ret == 0 ) {
request->granted_count = dma.granted_count;
return 0;
} else {
return -errno;
}
}
/**
* Obtain heavyweight hardware lock.
*
* \param fd file descriptor.
* \param context context.
* \param flags flags that determine the sate of the hardware when the function
* returns.
*
* \return always zero.
*
* \internal
* This function translates the arguments into a drm_lock structure and issue
* the DRM_IOCTL_LOCK ioctl until the lock is successfully acquired.
*/
drm_public int drmGetLock(int fd, drm_context_t context, drmLockFlags flags)
{
drm_lock_t lock;
memclear(lock);
lock.context = context;
lock.flags = 0;
if (flags & DRM_LOCK_READY) lock.flags |= _DRM_LOCK_READY;
if (flags & DRM_LOCK_QUIESCENT) lock.flags |= _DRM_LOCK_QUIESCENT;
if (flags & DRM_LOCK_FLUSH) lock.flags |= _DRM_LOCK_FLUSH;
if (flags & DRM_LOCK_FLUSH_ALL) lock.flags |= _DRM_LOCK_FLUSH_ALL;
if (flags & DRM_HALT_ALL_QUEUES) lock.flags |= _DRM_HALT_ALL_QUEUES;
if (flags & DRM_HALT_CUR_QUEUES) lock.flags |= _DRM_HALT_CUR_QUEUES;
while (drmIoctl(fd, DRM_IOCTL_LOCK, &lock))
;
return 0;
}
/**
* Release the hardware lock.
*
* \param fd file descriptor.
* \param context context.
*
* \return zero on success, or a negative value on failure.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_UNLOCK ioctl, passing the
* argument in a drm_lock structure.
*/
drm_public int drmUnlock(int fd, drm_context_t context)
{
drm_lock_t lock;
memclear(lock);
lock.context = context;
return drmIoctl(fd, DRM_IOCTL_UNLOCK, &lock);
}
drm_public drm_context_t *drmGetReservedContextList(int fd, int *count)
{
drm_ctx_res_t res;
drm_ctx_t *list;
drm_context_t * retval;
int i;
memclear(res);
if (drmIoctl(fd, DRM_IOCTL_RES_CTX, &res))
return NULL;
if (!res.count)
return NULL;
if (!(list = drmMalloc(res.count * sizeof(*list))))
return NULL;
if (!(retval = drmMalloc(res.count * sizeof(*retval))))
goto err_free_list;
res.contexts = list;
if (drmIoctl(fd, DRM_IOCTL_RES_CTX, &res))
goto err_free_context;
for (i = 0; i < res.count; i++)
retval[i] = list[i].handle;
drmFree(list);
*count = res.count;
return retval;
err_free_list:
drmFree(list);
err_free_context:
drmFree(retval);
return NULL;
}
drm_public void drmFreeReservedContextList(drm_context_t *pt)
{
drmFree(pt);
}
/**
* Create context.
*
* Used by the X server during GLXContext initialization. This causes
* per-context kernel-level resources to be allocated.
*
* \param fd file descriptor.
* \param handle is set on success. To be used by the client when requesting DMA
* dispatch with drmDMA().
*
* \return zero on success, or a negative value on failure.
*
* \note May only be called by root.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_ADD_CTX ioctl, passing the
* argument in a drm_ctx structure.
*/
drm_public int drmCreateContext(int fd, drm_context_t *handle)
{
drm_ctx_t ctx;
memclear(ctx);
if (drmIoctl(fd, DRM_IOCTL_ADD_CTX, &ctx))
return -errno;
*handle = ctx.handle;
return 0;
}
drm_public int drmSwitchToContext(int fd, drm_context_t context)
{
drm_ctx_t ctx;
memclear(ctx);
ctx.handle = context;
if (drmIoctl(fd, DRM_IOCTL_SWITCH_CTX, &ctx))
return -errno;
return 0;
}
drm_public int drmSetContextFlags(int fd, drm_context_t context,
drm_context_tFlags flags)
{
drm_ctx_t ctx;
/*
* Context preserving means that no context switches are done between DMA
* buffers from one context and the next. This is suitable for use in the
* X server (which promises to maintain hardware context), or in the
* client-side library when buffers are swapped on behalf of two threads.
*/
memclear(ctx);
ctx.handle = context;
if (flags & DRM_CONTEXT_PRESERVED)
ctx.flags |= _DRM_CONTEXT_PRESERVED;
if (flags & DRM_CONTEXT_2DONLY)
ctx.flags |= _DRM_CONTEXT_2DONLY;
if (drmIoctl(fd, DRM_IOCTL_MOD_CTX, &ctx))
return -errno;
return 0;
}
drm_public int drmGetContextFlags(int fd, drm_context_t context,
drm_context_tFlagsPtr flags)
{
drm_ctx_t ctx;
memclear(ctx);
ctx.handle = context;
if (drmIoctl(fd, DRM_IOCTL_GET_CTX, &ctx))
return -errno;
*flags = 0;
if (ctx.flags & _DRM_CONTEXT_PRESERVED)
*flags |= DRM_CONTEXT_PRESERVED;
if (ctx.flags & _DRM_CONTEXT_2DONLY)
*flags |= DRM_CONTEXT_2DONLY;
return 0;
}
/**
* Destroy context.
*
* Free any kernel-level resources allocated with drmCreateContext() associated
* with the context.
*
* \param fd file descriptor.
* \param handle handle given by drmCreateContext().
*
* \return zero on success, or a negative value on failure.
*
* \note May only be called by root.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_RM_CTX ioctl, passing the
* argument in a drm_ctx structure.
*/
drm_public int drmDestroyContext(int fd, drm_context_t handle)
{
drm_ctx_t ctx;
memclear(ctx);
ctx.handle = handle;
if (drmIoctl(fd, DRM_IOCTL_RM_CTX, &ctx))
return -errno;
return 0;
}
drm_public int drmCreateDrawable(int fd, drm_drawable_t *handle)
{
drm_draw_t draw;
memclear(draw);
if (drmIoctl(fd, DRM_IOCTL_ADD_DRAW, &draw))
return -errno;
*handle = draw.handle;
return 0;
}
drm_public int drmDestroyDrawable(int fd, drm_drawable_t handle)
{
drm_draw_t draw;
memclear(draw);
draw.handle = handle;
if (drmIoctl(fd, DRM_IOCTL_RM_DRAW, &draw))
return -errno;
return 0;
}
drm_public int drmUpdateDrawableInfo(int fd, drm_drawable_t handle,
drm_drawable_info_type_t type,
unsigned int num, void *data)
{
drm_update_draw_t update;
memclear(update);
update.handle = handle;
update.type = type;
update.num = num;
update.data = (unsigned long long)(unsigned long)data;
if (drmIoctl(fd, DRM_IOCTL_UPDATE_DRAW, &update))
return -errno;
return 0;
}
drm_public int drmCrtcGetSequence(int fd, uint32_t crtcId, uint64_t *sequence,
uint64_t *ns)
{
struct drm_crtc_get_sequence get_seq;
int ret;
memclear(get_seq);
get_seq.crtc_id = crtcId;
ret = drmIoctl(fd, DRM_IOCTL_CRTC_GET_SEQUENCE, &get_seq);
if (ret)
return ret;
if (sequence)
*sequence = get_seq.sequence;
if (ns)
*ns = get_seq.sequence_ns;
return 0;
}
drm_public int drmCrtcQueueSequence(int fd, uint32_t crtcId, uint32_t flags,
uint64_t sequence,
uint64_t *sequence_queued,
uint64_t user_data)
{
struct drm_crtc_queue_sequence queue_seq;
int ret;
memclear(queue_seq);
queue_seq.crtc_id = crtcId;
queue_seq.flags = flags;
queue_seq.sequence = sequence;
queue_seq.user_data = user_data;
ret = drmIoctl(fd, DRM_IOCTL_CRTC_QUEUE_SEQUENCE, &queue_seq);
if (ret == 0 && sequence_queued)
*sequence_queued = queue_seq.sequence;
return ret;
}
/**
* Acquire the AGP device.
*
* Must be called before any of the other AGP related calls.
*
* \param fd file descriptor.
*
* \return zero on success, or a negative value on failure.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_AGP_ACQUIRE ioctl.
*/
drm_public int drmAgpAcquire(int fd)
{
if (drmIoctl(fd, DRM_IOCTL_AGP_ACQUIRE, NULL))
return -errno;
return 0;
}
/**
* Release the AGP device.
*
* \param fd file descriptor.
*
* \return zero on success, or a negative value on failure.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_AGP_RELEASE ioctl.
*/
drm_public int drmAgpRelease(int fd)
{
if (drmIoctl(fd, DRM_IOCTL_AGP_RELEASE, NULL))
return -errno;
return 0;
}
/**
* Set the AGP mode.
*
* \param fd file descriptor.
* \param mode AGP mode.
*
* \return zero on success, or a negative value on failure.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_AGP_ENABLE ioctl, passing the
* argument in a drm_agp_mode structure.
*/
drm_public int drmAgpEnable(int fd, unsigned long mode)
{
drm_agp_mode_t m;
memclear(m);
m.mode = mode;
if (drmIoctl(fd, DRM_IOCTL_AGP_ENABLE, &m))
return -errno;
return 0;
}
/**
* Allocate a chunk of AGP memory.
*
* \param fd file descriptor.
* \param size requested memory size in bytes. Will be rounded to page boundary.
* \param type type of memory to allocate.
* \param address if not zero, will be set to the physical address of the
* allocated memory.
* \param handle on success will be set to a handle of the allocated memory.
*
* \return zero on success, or a negative value on failure.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_AGP_ALLOC ioctl, passing the
* arguments in a drm_agp_buffer structure.
*/
drm_public int drmAgpAlloc(int fd, unsigned long size, unsigned long type,
unsigned long *address, drm_handle_t *handle)
{
drm_agp_buffer_t b;
memclear(b);
*handle = DRM_AGP_NO_HANDLE;
b.size = size;
b.type = type;
if (drmIoctl(fd, DRM_IOCTL_AGP_ALLOC, &b))
return -errno;
if (address != 0UL)
*address = b.physical;
*handle = b.handle;
return 0;
}
/**
* Free a chunk of AGP memory.
*
* \param fd file descriptor.
* \param handle handle to the allocated memory, as given by drmAgpAllocate().
*
* \return zero on success, or a negative value on failure.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_AGP_FREE ioctl, passing the
* argument in a drm_agp_buffer structure.
*/
drm_public int drmAgpFree(int fd, drm_handle_t handle)
{
drm_agp_buffer_t b;
memclear(b);
b.handle = handle;
if (drmIoctl(fd, DRM_IOCTL_AGP_FREE, &b))
return -errno;
return 0;
}
/**
* Bind a chunk of AGP memory.
*
* \param fd file descriptor.
* \param handle handle to the allocated memory, as given by drmAgpAllocate().
* \param offset offset in bytes. It will round to page boundary.
*
* \return zero on success, or a negative value on failure.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_AGP_BIND ioctl, passing the
* argument in a drm_agp_binding structure.
*/
drm_public int drmAgpBind(int fd, drm_handle_t handle, unsigned long offset)
{
drm_agp_binding_t b;
memclear(b);
b.handle = handle;
b.offset = offset;
if (drmIoctl(fd, DRM_IOCTL_AGP_BIND, &b))
return -errno;
return 0;
}
/**
* Unbind a chunk of AGP memory.
*
* \param fd file descriptor.
* \param handle handle to the allocated memory, as given by drmAgpAllocate().
*
* \return zero on success, or a negative value on failure.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_AGP_UNBIND ioctl, passing
* the argument in a drm_agp_binding structure.
*/
drm_public int drmAgpUnbind(int fd, drm_handle_t handle)
{
drm_agp_binding_t b;
memclear(b);
b.handle = handle;
if (drmIoctl(fd, DRM_IOCTL_AGP_UNBIND, &b))
return -errno;
return 0;
}
/**
* Get AGP driver major version number.
*
* \param fd file descriptor.
*
* \return major version number on success, or a negative value on failure..
*
* \internal
* This function is a wrapper around the DRM_IOCTL_AGP_INFO ioctl, getting the
* necessary information in a drm_agp_info structure.
*/
drm_public int drmAgpVersionMajor(int fd)
{
drm_agp_info_t i;
memclear(i);
if (drmIoctl(fd, DRM_IOCTL_AGP_INFO, &i))
return -errno;
return i.agp_version_major;
}
/**
* Get AGP driver minor version number.
*
* \param fd file descriptor.
*
* \return minor version number on success, or a negative value on failure.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_AGP_INFO ioctl, getting the
* necessary information in a drm_agp_info structure.
*/
drm_public int drmAgpVersionMinor(int fd)
{
drm_agp_info_t i;
memclear(i);
if (drmIoctl(fd, DRM_IOCTL_AGP_INFO, &i))
return -errno;
return i.agp_version_minor;
}
/**
* Get AGP mode.
*
* \param fd file descriptor.
*
* \return mode on success, or zero on failure.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_AGP_INFO ioctl, getting the
* necessary information in a drm_agp_info structure.
*/
drm_public unsigned long drmAgpGetMode(int fd)
{
drm_agp_info_t i;
memclear(i);
if (drmIoctl(fd, DRM_IOCTL_AGP_INFO, &i))
return 0;
return i.mode;
}
/**
* Get AGP aperture base.
*
* \param fd file descriptor.
*
* \return aperture base on success, zero on failure.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_AGP_INFO ioctl, getting the
* necessary information in a drm_agp_info structure.
*/
drm_public unsigned long drmAgpBase(int fd)
{
drm_agp_info_t i;
memclear(i);
if (drmIoctl(fd, DRM_IOCTL_AGP_INFO, &i))
return 0;
return i.aperture_base;
}
/**
* Get AGP aperture size.
*
* \param fd file descriptor.
*
* \return aperture size on success, zero on failure.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_AGP_INFO ioctl, getting the
* necessary information in a drm_agp_info structure.
*/
drm_public unsigned long drmAgpSize(int fd)
{
drm_agp_info_t i;
memclear(i);
if (drmIoctl(fd, DRM_IOCTL_AGP_INFO, &i))
return 0;
return i.aperture_size;
}
/**
* Get used AGP memory.
*
* \param fd file descriptor.
*
* \return memory used on success, or zero on failure.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_AGP_INFO ioctl, getting the
* necessary information in a drm_agp_info structure.
*/
drm_public unsigned long drmAgpMemoryUsed(int fd)
{
drm_agp_info_t i;
memclear(i);
if (drmIoctl(fd, DRM_IOCTL_AGP_INFO, &i))
return 0;
return i.memory_used;
}
/**
* Get available AGP memory.
*
* \param fd file descriptor.
*
* \return memory available on success, or zero on failure.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_AGP_INFO ioctl, getting the
* necessary information in a drm_agp_info structure.
*/
drm_public unsigned long drmAgpMemoryAvail(int fd)
{
drm_agp_info_t i;
memclear(i);
if (drmIoctl(fd, DRM_IOCTL_AGP_INFO, &i))
return 0;
return i.memory_allowed;
}
/**
* Get hardware vendor ID.
*
* \param fd file descriptor.
*
* \return vendor ID on success, or zero on failure.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_AGP_INFO ioctl, getting the
* necessary information in a drm_agp_info structure.
*/
drm_public unsigned int drmAgpVendorId(int fd)
{
drm_agp_info_t i;
memclear(i);
if (drmIoctl(fd, DRM_IOCTL_AGP_INFO, &i))
return 0;
return i.id_vendor;
}
/**
* Get hardware device ID.
*
* \param fd file descriptor.
*
* \return zero on success, or zero on failure.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_AGP_INFO ioctl, getting the
* necessary information in a drm_agp_info structure.
*/
drm_public unsigned int drmAgpDeviceId(int fd)
{
drm_agp_info_t i;
memclear(i);
if (drmIoctl(fd, DRM_IOCTL_AGP_INFO, &i))
return 0;
return i.id_device;
}
drm_public int drmScatterGatherAlloc(int fd, unsigned long size,
drm_handle_t *handle)
{
drm_scatter_gather_t sg;
memclear(sg);
*handle = 0;
sg.size = size;
if (drmIoctl(fd, DRM_IOCTL_SG_ALLOC, &sg))
return -errno;
*handle = sg.handle;
return 0;
}
drm_public int drmScatterGatherFree(int fd, drm_handle_t handle)
{
drm_scatter_gather_t sg;
memclear(sg);
sg.handle = handle;
if (drmIoctl(fd, DRM_IOCTL_SG_FREE, &sg))
return -errno;
return 0;
}
/**
* Wait for VBLANK.
*
* \param fd file descriptor.
* \param vbl pointer to a drmVBlank structure.
*
* \return zero on success, or a negative value on failure.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_WAIT_VBLANK ioctl.
*/
drm_public int drmWaitVBlank(int fd, drmVBlankPtr vbl)
{
struct timespec timeout, cur;
int ret;
ret = clock_gettime(CLOCK_MONOTONIC, &timeout);
if (ret < 0) {
fprintf(stderr, "clock_gettime failed: %s\n", strerror(errno));
goto out;
}
timeout.tv_sec++;
do {
ret = ioctl(fd, DRM_IOCTL_WAIT_VBLANK, vbl);
vbl->request.type &= ~DRM_VBLANK_RELATIVE;
if (ret && errno == EINTR) {
clock_gettime(CLOCK_MONOTONIC, &cur);
/* Timeout after 1s */
if (cur.tv_sec > timeout.tv_sec + 1 ||
(cur.tv_sec == timeout.tv_sec && cur.tv_nsec >=
timeout.tv_nsec)) {
errno = EBUSY;
ret = -1;
break;
}
}
} while (ret && errno == EINTR);
out:
return ret;
}
drm_public int drmError(int err, const char *label)
{
switch (err) {
case DRM_ERR_NO_DEVICE:
fprintf(stderr, "%s: no device\n", label);
break;
case DRM_ERR_NO_ACCESS:
fprintf(stderr, "%s: no access\n", label);
break;
case DRM_ERR_NOT_ROOT:
fprintf(stderr, "%s: not root\n", label);
break;
case DRM_ERR_INVALID:
fprintf(stderr, "%s: invalid args\n", label);
break;
default:
if (err < 0)
err = -err;
fprintf( stderr, "%s: error %d (%s)\n", label, err, strerror(err) );
break;
}
return 1;
}
/**
* Install IRQ handler.
*
* \param fd file descriptor.
* \param irq IRQ number.
*
* \return zero on success, or a negative value on failure.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_CONTROL ioctl, passing the
* argument in a drm_control structure.
*/
drm_public int drmCtlInstHandler(int fd, int irq)
{
drm_control_t ctl;
memclear(ctl);
ctl.func = DRM_INST_HANDLER;
ctl.irq = irq;
if (drmIoctl(fd, DRM_IOCTL_CONTROL, &ctl))
return -errno;
return 0;
}
/**
* Uninstall IRQ handler.
*
* \param fd file descriptor.
*
* \return zero on success, or a negative value on failure.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_CONTROL ioctl, passing the
* argument in a drm_control structure.
*/
drm_public int drmCtlUninstHandler(int fd)
{
drm_control_t ctl;
memclear(ctl);
ctl.func = DRM_UNINST_HANDLER;
ctl.irq = 0;
if (drmIoctl(fd, DRM_IOCTL_CONTROL, &ctl))
return -errno;
return 0;
}
drm_public int drmFinish(int fd, int context, drmLockFlags flags)
{
drm_lock_t lock;
memclear(lock);
lock.context = context;
if (flags & DRM_LOCK_READY) lock.flags |= _DRM_LOCK_READY;
if (flags & DRM_LOCK_QUIESCENT) lock.flags |= _DRM_LOCK_QUIESCENT;
if (flags & DRM_LOCK_FLUSH) lock.flags |= _DRM_LOCK_FLUSH;
if (flags & DRM_LOCK_FLUSH_ALL) lock.flags |= _DRM_LOCK_FLUSH_ALL;
if (flags & DRM_HALT_ALL_QUEUES) lock.flags |= _DRM_HALT_ALL_QUEUES;
if (flags & DRM_HALT_CUR_QUEUES) lock.flags |= _DRM_HALT_CUR_QUEUES;
if (drmIoctl(fd, DRM_IOCTL_FINISH, &lock))
return -errno;
return 0;
}
/**
* Get IRQ from bus ID.
*
* \param fd file descriptor.
* \param busnum bus number.
* \param devnum device number.
* \param funcnum function number.
*
* \return IRQ number on success, or a negative value on failure.
*
* \internal
* This function is a wrapper around the DRM_IOCTL_IRQ_BUSID ioctl, passing the
* arguments in a drm_irq_busid structure.
*/
drm_public int drmGetInterruptFromBusID(int fd, int busnum, int devnum,
int funcnum)
{
drm_irq_busid_t p;
memclear(p);
p.busnum = busnum;
p.devnum = devnum;
p.funcnum = funcnum;
if (drmIoctl(fd, DRM_IOCTL_IRQ_BUSID, &p))
return -errno;
return p.irq;
}
drm_public int drmAddContextTag(int fd, drm_context_t context, void *tag)
{
drmHashEntry *entry = drmGetEntry(fd);
if (drmHashInsert(entry->tagTable, context, tag)) {
drmHashDelete(entry->tagTable, context);
drmHashInsert(entry->tagTable, context, tag);
}
return 0;
}
drm_public int drmDelContextTag(int fd, drm_context_t context)
{
drmHashEntry *entry = drmGetEntry(fd);
return drmHashDelete(entry->tagTable, context);
}
drm_public void *drmGetContextTag(int fd, drm_context_t context)
{
drmHashEntry *entry = drmGetEntry(fd);
void *value;
if (drmHashLookup(entry->tagTable, context, &value))
return NULL;
return value;
}
drm_public int drmAddContextPrivateMapping(int fd, drm_context_t ctx_id,
drm_handle_t handle)
{
drm_ctx_priv_map_t map;
memclear(map);
map.ctx_id = ctx_id;
map.handle = (void *)(uintptr_t)handle;
if (drmIoctl(fd, DRM_IOCTL_SET_SAREA_CTX, &map))
return -errno;
return 0;
}
drm_public int drmGetContextPrivateMapping(int fd, drm_context_t ctx_id,
drm_handle_t *handle)
{
drm_ctx_priv_map_t map;
memclear(map);
map.ctx_id = ctx_id;
if (drmIoctl(fd, DRM_IOCTL_GET_SAREA_CTX, &map))
return -errno;
if (handle)
*handle = (drm_handle_t)(uintptr_t)map.handle;
return 0;
}
drm_public int drmGetMap(int fd, int idx, drm_handle_t *offset, drmSize *size,
drmMapType *type, drmMapFlags *flags,
drm_handle_t *handle, int *mtrr)
{
drm_map_t map;
memclear(map);
map.offset = idx;
if (drmIoctl(fd, DRM_IOCTL_GET_MAP, &map))
return -errno;
*offset = map.offset;
*size = map.size;
*type = map.type;
*flags = map.flags;
*handle = (unsigned long)map.handle;
*mtrr = map.mtrr;
return 0;
}
drm_public int drmGetClient(int fd, int idx, int *auth, int *pid, int *uid,
unsigned long *magic, unsigned long *iocs)
{
drm_client_t client;
memclear(client);
client.idx = idx;
if (drmIoctl(fd, DRM_IOCTL_GET_CLIENT, &client))
return -errno;
*auth = client.auth;
*pid = client.pid;
*uid = client.uid;
*magic = client.magic;
*iocs = client.iocs;
return 0;
}
drm_public int drmGetStats(int fd, drmStatsT *stats)
{
drm_stats_t s;
unsigned i;
memclear(s);
if (drmIoctl(fd, DRM_IOCTL_GET_STATS, &s))
return -errno;
stats->count = 0;
memset(stats, 0, sizeof(*stats));
if (s.count > sizeof(stats->data)/sizeof(stats->data[0]))
return -1;
#define SET_VALUE \
stats->data[i].long_format = "%-20.20s"; \
stats->data[i].rate_format = "%8.8s"; \
stats->data[i].isvalue = 1; \
stats->data[i].verbose = 0
#define SET_COUNT \
stats->data[i].long_format = "%-20.20s"; \
stats->data[i].rate_format = "%5.5s"; \
stats->data[i].isvalue = 0; \
stats->data[i].mult_names = "kgm"; \
stats->data[i].mult = 1000; \
stats->data[i].verbose = 0
#define SET_BYTE \
stats->data[i].long_format = "%-20.20s"; \
stats->data[i].rate_format = "%5.5s"; \
stats->data[i].isvalue = 0; \
stats->data[i].mult_names = "KGM"; \
stats->data[i].mult = 1024; \
stats->data[i].verbose = 0
stats->count = s.count;
for (i = 0; i < s.count; i++) {
stats->data[i].value = s.data[i].value;
switch (s.data[i].type) {
case _DRM_STAT_LOCK:
stats->data[i].long_name = "Lock";
stats->data[i].rate_name = "Lock";
SET_VALUE;
break;
case _DRM_STAT_OPENS:
stats->data[i].long_name = "Opens";
stats->data[i].rate_name = "O";
SET_COUNT;
stats->data[i].verbose = 1;
break;
case _DRM_STAT_CLOSES:
stats->data[i].long_name = "Closes";
stats->data[i].rate_name = "Lock";
SET_COUNT;
stats->data[i].verbose = 1;
break;
case _DRM_STAT_IOCTLS:
stats->data[i].long_name = "Ioctls";
stats->data[i].rate_name = "Ioc/s";
SET_COUNT;
break;
case _DRM_STAT_LOCKS:
stats->data[i].long_name = "Locks";
stats->data[i].rate_name = "Lck/s";
SET_COUNT;
break;
case _DRM_STAT_UNLOCKS:
stats->data[i].long_name = "Unlocks";
stats->data[i].rate_name = "Unl/s";
SET_COUNT;
break;
case _DRM_STAT_IRQ:
stats->data[i].long_name = "IRQs";
stats->data[i].rate_name = "IRQ/s";
SET_COUNT;
break;
case _DRM_STAT_PRIMARY:
stats->data[i].long_name = "Primary Bytes";
stats->data[i].rate_name = "PB/s";
SET_BYTE;
break;
case _DRM_STAT_SECONDARY:
stats->data[i].long_name = "Secondary Bytes";
stats->data[i].rate_name = "SB/s";
SET_BYTE;
break;
case _DRM_STAT_DMA:
stats->data[i].long_name = "DMA";
stats->data[i].rate_name = "DMA/s";
SET_COUNT;
break;
case _DRM_STAT_SPECIAL:
stats->data[i].long_name = "Special DMA";
stats->data[i].rate_name = "dma/s";
SET_COUNT;
break;
case _DRM_STAT_MISSED:
stats->data[i].long_name = "Miss";
stats->data[i].rate_name = "Ms/s";
SET_COUNT;
break;
case _DRM_STAT_VALUE:
stats->data[i].long_name = "Value";
stats->data[i].rate_name = "Value";
SET_VALUE;
break;
case _DRM_STAT_BYTE:
stats->data[i].long_name = "Bytes";
stats->data[i].rate_name = "B/s";
SET_BYTE;
break;
case _DRM_STAT_COUNT:
default:
stats->data[i].long_name = "Count";
stats->data[i].rate_name = "Cnt/s";
SET_COUNT;
break;
}
}
return 0;
}
/**
* Issue a set-version ioctl.
*
* \param fd file descriptor.
* \param drmCommandIndex command index
* \param data source pointer of the data to be read and written.
* \param size size of the data to be read and written.
*
* \return zero on success, or a negative value on failure.
*
* \internal
* It issues a read-write ioctl given by
* \code DRM_COMMAND_BASE + drmCommandIndex \endcode.
*/
drm_public int drmSetInterfaceVersion(int fd, drmSetVersion *version)
{
int retcode = 0;
drm_set_version_t sv;
memclear(sv);
sv.drm_di_major = version->drm_di_major;
sv.drm_di_minor = version->drm_di_minor;
sv.drm_dd_major = version->drm_dd_major;
sv.drm_dd_minor = version->drm_dd_minor;
if (drmIoctl(fd, DRM_IOCTL_SET_VERSION, &sv)) {
retcode = -errno;
}
version->drm_di_major = sv.drm_di_major;
version->drm_di_minor = sv.drm_di_minor;
version->drm_dd_major = sv.drm_dd_major;
version->drm_dd_minor = sv.drm_dd_minor;
return retcode;
}
/**
* Send a device-specific command.
*
* \param fd file descriptor.
* \param drmCommandIndex command index
*
* \return zero on success, or a negative value on failure.
*
* \internal
* It issues a ioctl given by
* \code DRM_COMMAND_BASE + drmCommandIndex \endcode.
*/
drm_public int drmCommandNone(int fd, unsigned long drmCommandIndex)
{
unsigned long request;
request = DRM_IO( DRM_COMMAND_BASE + drmCommandIndex);
if (drmIoctl(fd, request, NULL)) {
return -errno;
}
return 0;
}
/**
* Send a device-specific read command.
*
* \param fd file descriptor.
* \param drmCommandIndex command index
* \param data destination pointer of the data to be read.
* \param size size of the data to be read.
*
* \return zero on success, or a negative value on failure.
*
* \internal
* It issues a read ioctl given by
* \code DRM_COMMAND_BASE + drmCommandIndex \endcode.
*/
drm_public int drmCommandRead(int fd, unsigned long drmCommandIndex,
void *data, unsigned long size)
{
unsigned long request;
request = DRM_IOC( DRM_IOC_READ, DRM_IOCTL_BASE,
DRM_COMMAND_BASE + drmCommandIndex, size);
if (drmIoctl(fd, request, data)) {
return -errno;
}
return 0;
}
/**
* Send a device-specific write command.
*
* \param fd file descriptor.
* \param drmCommandIndex command index
* \param data source pointer of the data to be written.
* \param size size of the data to be written.
*
* \return zero on success, or a negative value on failure.
*
* \internal
* It issues a write ioctl given by
* \code DRM_COMMAND_BASE + drmCommandIndex \endcode.
*/
drm_public int drmCommandWrite(int fd, unsigned long drmCommandIndex,
void *data, unsigned long size)
{
unsigned long request;
request = DRM_IOC( DRM_IOC_WRITE, DRM_IOCTL_BASE,
DRM_COMMAND_BASE + drmCommandIndex, size);
if (drmIoctl(fd, request, data)) {
return -errno;
}
return 0;
}
/**
* Send a device-specific read-write command.
*
* \param fd file descriptor.
* \param drmCommandIndex command index
* \param data source pointer of the data to be read and written.
* \param size size of the data to be read and written.
*
* \return zero on success, or a negative value on failure.
*
* \internal
* It issues a read-write ioctl given by
* \code DRM_COMMAND_BASE + drmCommandIndex \endcode.
*/
drm_public int drmCommandWriteRead(int fd, unsigned long drmCommandIndex,
void *data, unsigned long size)
{
unsigned long request;
request = DRM_IOC( DRM_IOC_READ|DRM_IOC_WRITE, DRM_IOCTL_BASE,
DRM_COMMAND_BASE + drmCommandIndex, size);
if (drmIoctl(fd, request, data))
return -errno;
return 0;
}
#define DRM_MAX_FDS 16
static struct {
char *BusID;
int fd;
int refcount;
int type;
} connection[DRM_MAX_FDS];
static int nr_fds = 0;
drm_public int drmOpenOnce(void *unused, const char *BusID, int *newlyopened)
{
return drmOpenOnceWithType(BusID, newlyopened, DRM_NODE_PRIMARY);
}
drm_public int drmOpenOnceWithType(const char *BusID, int *newlyopened,
int type)
{
int i;
int fd;
for (i = 0; i < nr_fds; i++)
if ((strcmp(BusID, connection[i].BusID) == 0) &&
(connection[i].type == type)) {
connection[i].refcount++;
*newlyopened = 0;
return connection[i].fd;
}
fd = drmOpenWithType(NULL, BusID, type);
if (fd < 0 || nr_fds == DRM_MAX_FDS)
return fd;
connection[nr_fds].BusID = strdup(BusID);
connection[nr_fds].fd = fd;
connection[nr_fds].refcount = 1;
connection[nr_fds].type = type;
*newlyopened = 1;
if (0)
fprintf(stderr, "saved connection %d for %s %d\n",
nr_fds, connection[nr_fds].BusID,
strcmp(BusID, connection[nr_fds].BusID));
nr_fds++;
return fd;
}
drm_public void drmCloseOnce(int fd)
{
int i;
for (i = 0; i < nr_fds; i++) {
if (fd == connection[i].fd) {
if (--connection[i].refcount == 0) {
drmClose(connection[i].fd);
free(connection[i].BusID);
if (i < --nr_fds)
connection[i] = connection[nr_fds];
return;
}
}
}
}
drm_public int drmSetMaster(int fd)
{
return drmIoctl(fd, DRM_IOCTL_SET_MASTER, NULL);
}
drm_public int drmDropMaster(int fd)
{
return drmIoctl(fd, DRM_IOCTL_DROP_MASTER, NULL);
}
drm_public char *drmGetDeviceNameFromFd(int fd)
{
char name[128];
struct stat sbuf;
dev_t d;
int i;
/* The whole drmOpen thing is a fiasco and we need to find a way
* back to just using open(2). For now, however, lets just make
* things worse with even more ad hoc directory walking code to
* discover the device file name. */
fstat(fd, &sbuf);
d = sbuf.st_rdev;
for (i = 0; i < DRM_MAX_MINOR; i++) {
snprintf(name, sizeof name, DRM_DEV_NAME, DRM_DIR_NAME, i);
if (stat(name, &sbuf) == 0 && sbuf.st_rdev == d)
break;
}
if (i == DRM_MAX_MINOR)
return NULL;
return strdup(name);
}
static bool drmNodeIsDRM(int maj, int min)
{
#ifdef __linux__
char path[64];
struct stat sbuf;
snprintf(path, sizeof(path), "/sys/dev/char/%d:%d/device/drm",
maj, min);
return stat(path, &sbuf) == 0;
#else
return maj == DRM_MAJOR;
#endif
}
drm_public int drmGetNodeTypeFromFd(int fd)
{
struct stat sbuf;
int maj, min, type;
if (fstat(fd, &sbuf))
return -1;
maj = major(sbuf.st_rdev);
min = minor(sbuf.st_rdev);
if (!drmNodeIsDRM(maj, min) || !S_ISCHR(sbuf.st_mode)) {
errno = EINVAL;
return -1;
}
type = drmGetMinorType(min);
if (type == -1)
errno = ENODEV;
return type;
}
drm_public int drmPrimeHandleToFD(int fd, uint32_t handle, uint32_t flags,
int *prime_fd)
{
struct drm_prime_handle args;
int ret;
memclear(args);
args.fd = -1;
args.handle = handle;
args.flags = flags;
ret = drmIoctl(fd, DRM_IOCTL_PRIME_HANDLE_TO_FD, &args);
if (ret)
return ret;
*prime_fd = args.fd;
return 0;
}
drm_public int drmPrimeFDToHandle(int fd, int prime_fd, uint32_t *handle)
{
struct drm_prime_handle args;
int ret;
memclear(args);
args.fd = prime_fd;
ret = drmIoctl(fd, DRM_IOCTL_PRIME_FD_TO_HANDLE, &args);
if (ret)
return ret;
*handle = args.handle;
return 0;
}
static char *drmGetMinorNameForFD(int fd, int type)
{
#ifdef __linux__
DIR *sysdir;
struct dirent *ent;
struct stat sbuf;
const char *name = drmGetMinorName(type);
int len;
char dev_name[64], buf[64];
int maj, min;
if (!name)
return NULL;
len = strlen(name);
if (fstat(fd, &sbuf))
return NULL;
maj = major(sbuf.st_rdev);
min = minor(sbuf.st_rdev);
if (!drmNodeIsDRM(maj, min) || !S_ISCHR(sbuf.st_mode))
return NULL;
snprintf(buf, sizeof(buf), "/sys/dev/char/%d:%d/device/drm", maj, min);
sysdir = opendir(buf);
if (!sysdir)
return NULL;
while ((ent = readdir(sysdir))) {
if (strncmp(ent->d_name, name, len) == 0) {
snprintf(dev_name, sizeof(dev_name), DRM_DIR_NAME "/%s",
ent->d_name);
closedir(sysdir);
return strdup(dev_name);
}
}
closedir(sysdir);
return NULL;
#else
struct stat sbuf;
char buf[PATH_MAX + 1];
const char *dev_name;
unsigned int maj, min;
int n, base;
if (fstat(fd, &sbuf))
return NULL;
maj = major(sbuf.st_rdev);
min = minor(sbuf.st_rdev);
if (!drmNodeIsDRM(maj, min) || !S_ISCHR(sbuf.st_mode))
return NULL;
switch (type) {
case DRM_NODE_PRIMARY:
dev_name = DRM_DEV_NAME;
break;
case DRM_NODE_CONTROL:
dev_name = DRM_CONTROL_DEV_NAME;
break;
case DRM_NODE_RENDER:
dev_name = DRM_RENDER_DEV_NAME;
break;
default:
return NULL;
};
base = drmGetMinorBase(type);
if (base < 0)
return NULL;
n = snprintf(buf, sizeof(buf), dev_name, DRM_DIR_NAME, min - base);
if (n == -1 || n >= sizeof(buf))
return NULL;
return strdup(buf);
#endif
}
drm_public char *drmGetPrimaryDeviceNameFromFd(int fd)
{
return drmGetMinorNameForFD(fd, DRM_NODE_PRIMARY);
}
drm_public char *drmGetRenderDeviceNameFromFd(int fd)
{
return drmGetMinorNameForFD(fd, DRM_NODE_RENDER);
}
#ifdef __linux__
static char * DRM_PRINTFLIKE(2, 3)
sysfs_uevent_get(const char *path, const char *fmt, ...)
{
char filename[PATH_MAX + 1], *key, *line = NULL, *value = NULL;
size_t size = 0, len;
ssize_t num;
va_list ap;
FILE *fp;
va_start(ap, fmt);
num = vasprintf(&key, fmt, ap);