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xenocara/lib/libdrm/xf86drm.c
jsg be0e9688f3 test for render nodes before primary nodes 
Unlike linux our primary "drm" device name is substring of the "drmR"
render node device name and strncmp() tests resulted in render nodes
being flagged as primary nodes.
2019-03-22 11:41:33 +00:00

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/**
* \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>
/* 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
#ifdef __OpenBSD__
#define X_PRIVSEP
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
#ifdef X_PRIVSEP
static int
_priv_open_device(const char *path)
{
drmMsg("_priv_open_device\n");
return open(path, O_RDWR, 0);
}
drm_public int priv_open_device(const char *)
__attribute__((weak, alias ("_priv_open_device")));
#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);
}
#ifndef __OpenBSD__
#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
#endif /* __OpenBSD__ */
#ifndef X_PRIVSEP
fd = open(buf, O_RDWR | O_CLOEXEC, 0);
#else
fd = priv_open_device(buf);
#endif
drmMsg("drmOpenDevice: open result is %d, (%s)\n",
fd, fd < 0 ? strerror(errno) : "OK");
if (fd >= 0)
return fd;
#if !UDEV && !defined(__OpenBSD__)
/* 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);
#ifndef X_PRIVSEP
fd = open(buf, O_RDWR | O_CLOEXEC, 0);
#else
fd = priv_open_device(buf);
#endif
if (fd >= 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);
va_end(ap);
len = num;
snprintf(filename, sizeof(filename), "%s/uevent", path);
fp = fopen(filename, "r");
if (!fp) {
free(key);
return NULL;
}
while ((num = getline(&line, &size, fp)) >= 0) {
if ((strncmp(line, key, len) == 0) && (line[len] == '=')) {
char *start = line + len + 1, *end = line + num - 1;
if (*end != '\n')
end++;
value = strndup(start, end - start);
break;
}
}
free(line);
fclose(fp);
free(key);
return value;
}
#endif
/* Little white lie to avoid major rework of the existing code */
#define DRM_BUS_VIRTIO 0x10
static int drmParseSubsystemType(int maj, int min)
{
#ifdef __linux__
char path[PATH_MAX + 1];
char link[PATH_MAX + 1] = "";
char *name;
snprintf(path, PATH_MAX, "/sys/dev/char/%d:%d/device/subsystem",
maj, min);
if (readlink(path, link, PATH_MAX) < 0)
return -errno;
name = strrchr(link, '/');
if (!name)
return -EINVAL;
if (strncmp(name, "/pci", 4) == 0)
return DRM_BUS_PCI;
if (strncmp(name, "/usb", 4) == 0)
return DRM_BUS_USB;
if (strncmp(name, "/platform", 9) == 0)
return DRM_BUS_PLATFORM;
if (strncmp(name, "/host1x", 7) == 0)
return DRM_BUS_HOST1X;
if (strncmp(name, "/virtio", 7) == 0)
return DRM_BUS_VIRTIO;
return -EINVAL;
#elif defined(__OpenBSD__)
return DRM_BUS_PCI;
#else
#warning "Missing implementation of drmParseSubsystemType"
return -EINVAL;
#endif
}
static void
get_pci_path(int maj, int min, char *pci_path)
{
char path[PATH_MAX + 1], *term;
snprintf(path, sizeof(path), "/sys/dev/char/%d:%d/device", maj, min);
if (!realpath(path, pci_path)) {
strcpy(pci_path, path);
return;
}
term = strrchr(pci_path, '/');
if (term && strncmp(term, "/virtio", 7) == 0)
*term = 0;
}
static int drmParsePciBusInfo(int maj, int min, drmPciBusInfoPtr info)
{
#ifdef __linux__
unsigned int domain, bus, dev, func;
char pci_path[PATH_MAX + 1], *value;
int num;
get_pci_path(maj, min, pci_path);
value = sysfs_uevent_get(pci_path, "PCI_SLOT_NAME");
if (!value)
return -ENOENT;
num = sscanf(value, "%04x:%02x:%02x.%1u", &domain, &bus, &dev, &func);
free(value);
if (num != 4)
return -EINVAL;
info->domain = domain;
info->bus = bus;
info->dev = dev;
info->func = func;
return 0;
#elif defined(__OpenBSD__)
struct drm_pciinfo pinfo;
int fd, type;
type = drmGetMinorType(min);
if (type == -1)
return -ENODEV;
fd = drmOpenMinor(min, 0, type);
if (fd < 0)
return -errno;
if (drmIoctl(fd, DRM_IOCTL_GET_PCIINFO, &pinfo)) {
close(fd);
return -errno;
}
close(fd);
info->domain = pinfo.domain;
info->bus = pinfo.bus;
info->dev = pinfo.dev;
info->func = pinfo.func;
return 0;
#else
#warning "Missing implementation of drmParsePciBusInfo"
return -EINVAL;
#endif
}
drm_public int drmDevicesEqual(drmDevicePtr a, drmDevicePtr b)
{
if (a == NULL || b == NULL)
return 0;
if (a->bustype != b->bustype)
return 0;
switch (a->bustype) {
case DRM_BUS_PCI:
return memcmp(a->businfo.pci, b->businfo.pci, sizeof(drmPciBusInfo)) == 0;
case DRM_BUS_USB:
return memcmp(a->businfo.usb, b->businfo.usb, sizeof(drmUsbBusInfo)) == 0;
case DRM_BUS_PLATFORM:
return memcmp(a->businfo.platform, b->businfo.platform, sizeof(drmPlatformBusInfo)) == 0;
case DRM_BUS_HOST1X:
return memcmp(a->businfo.host1x, b->businfo.host1x, sizeof(drmHost1xBusInfo)) == 0;
default:
break;
}
return 0;
}
static int drmGetNodeType(const char *name)
{
if (strncmp(name, DRM_CONTROL_MINOR_NAME,
sizeof(DRM_CONTROL_MINOR_NAME ) - 1) == 0)
return DRM_NODE_CONTROL;
if (strncmp(name, DRM_RENDER_MINOR_NAME,
sizeof(DRM_RENDER_MINOR_NAME) - 1) == 0)
return DRM_NODE_RENDER;
if (strncmp(name, DRM_PRIMARY_MINOR_NAME,
sizeof(DRM_PRIMARY_MINOR_NAME) - 1) == 0)
return DRM_NODE_PRIMARY;
return -EINVAL;
}
static int drmGetMaxNodeName(void)
{
return sizeof(DRM_DIR_NAME) +
MAX3(sizeof(DRM_PRIMARY_MINOR_NAME),
sizeof(DRM_CONTROL_MINOR_NAME),
sizeof(DRM_RENDER_MINOR_NAME)) +
3 /* length of the node number */;
}
#ifdef __linux__
static int parse_separate_sysfs_files(int maj, int min,
drmPciDeviceInfoPtr device,
bool ignore_revision)
{
#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
static const char *attrs[] = {
"revision", /* Older kernels are missing the file, so check for it first */
"vendor",
"device",
"subsystem_vendor",
"subsystem_device",
};
char path[PATH_MAX + 1], pci_path[PATH_MAX + 1];
unsigned int data[ARRAY_SIZE(attrs)];
FILE *fp;
int ret;
get_pci_path(maj, min, pci_path);
for (unsigned i = ignore_revision ? 1 : 0; i < ARRAY_SIZE(attrs); i++) {
snprintf(path, PATH_MAX, "%s/%s", pci_path, attrs[i]);
fp = fopen(path, "r");
if (!fp)
return -errno;
ret = fscanf(fp, "%x", &data[i]);
fclose(fp);
if (ret != 1)
return -errno;
}
device->revision_id = ignore_revision ? 0xff : data[0] & 0xff;
device->vendor_id = data[1] & 0xffff;
device->device_id = data[2] & 0xffff;
device->subvendor_id = data[3] & 0xffff;
device->subdevice_id = data[4] & 0xffff;
return 0;
}
static int parse_config_sysfs_file(int maj, int min,
drmPciDeviceInfoPtr device)
{
char path[PATH_MAX + 1], pci_path[PATH_MAX + 1];
unsigned char config[64];
int fd, ret;
get_pci_path(maj, min, pci_path);
snprintf(path, PATH_MAX, "%s/config", pci_path);
fd = open(path, O_RDONLY);
if (fd < 0)
return -errno;
ret = read(fd, config, sizeof(config));
close(fd);
if (ret < 0)
return -errno;
device->vendor_id = config[0] | (config[1] << 8);
device->device_id = config[2] | (config[3] << 8);
device->revision_id = config[8];
device->subvendor_id = config[44] | (config[45] << 8);
device->subdevice_id = config[46] | (config[47] << 8);
return 0;
}
#endif
static int drmParsePciDeviceInfo(int maj, int min,
drmPciDeviceInfoPtr device,
uint32_t flags)
{
#ifdef __linux__
if (!(flags & DRM_DEVICE_GET_PCI_REVISION))
return parse_separate_sysfs_files(maj, min, device, true);
if (parse_separate_sysfs_files(maj, min, device, false))
return parse_config_sysfs_file(maj, min, device);
return 0;
#elif defined(__OpenBSD__)
struct drm_pciinfo pinfo;
int fd, type;
type = drmGetMinorType(min);
if (type == -1)
return -ENODEV;
fd = drmOpenMinor(min, 0, type);
if (fd < 0)
return -errno;
if (drmIoctl(fd, DRM_IOCTL_GET_PCIINFO, &pinfo)) {
close(fd);
return -errno;
}
close(fd);
device->vendor_id = pinfo.vendor_id;
device->device_id = pinfo.device_id;
device->revision_id = pinfo.revision_id;
device->subvendor_id = pinfo.subvendor_id;
device->subdevice_id = pinfo.subdevice_id;
return 0;
#else
#warning "Missing implementation of drmParsePciDeviceInfo"
return -EINVAL;
#endif
}
static void drmFreePlatformDevice(drmDevicePtr device)
{
if (device->deviceinfo.platform) {
if (device->deviceinfo.platform->compatible) {
char **compatible = device->deviceinfo.platform->compatible;
while (*compatible) {
free(*compatible);
compatible++;
}
free(device->deviceinfo.platform->compatible);
}
}
}
static void drmFreeHost1xDevice(drmDevicePtr device)
{
if (device->deviceinfo.host1x) {
if (device->deviceinfo.host1x->compatible) {
char **compatible = device->deviceinfo.host1x->compatible;
while (*compatible) {
free(*compatible);
compatible++;
}
free(device->deviceinfo.host1x->compatible);
}
}
}
drm_public void drmFreeDevice(drmDevicePtr *device)
{
if (device == NULL)
return;
if (*device) {
switch ((*device)->bustype) {
case DRM_BUS_PLATFORM:
drmFreePlatformDevice(*device);
break;
case DRM_BUS_HOST1X:
drmFreeHost1xDevice(*device);
break;
}
}
free(*device);
*device = NULL;
}
drm_public void drmFreeDevices(drmDevicePtr devices[], int count)
{
int i;
if (devices == NULL)
return;
for (i = 0; i < count; i++)
if (devices[i])
drmFreeDevice(&devices[i]);
}
static drmDevicePtr drmDeviceAlloc(unsigned int type, const char *node,
size_t bus_size, size_t device_size,
char **ptrp)
{
size_t max_node_length, extra, size;
drmDevicePtr device;
unsigned int i;
char *ptr;
max_node_length = ALIGN(drmGetMaxNodeName(), sizeof(void *));
extra = DRM_NODE_MAX * (sizeof(void *) + max_node_length);
size = sizeof(*device) + extra + bus_size + device_size;
device = calloc(1, size);
if (!device)
return NULL;
device->available_nodes = 1 << type;
ptr = (char *)device + sizeof(*device);
device->nodes = (char **)ptr;
ptr += DRM_NODE_MAX * sizeof(void *);
for (i = 0; i < DRM_NODE_MAX; i++) {
device->nodes[i] = ptr;
ptr += max_node_length;
}
memcpy(device->nodes[type], node, max_node_length);
*ptrp = ptr;
return device;
}
static int drmProcessPciDevice(drmDevicePtr *device,
const char *node, int node_type,
int maj, int min, bool fetch_deviceinfo,
uint32_t flags)
{
drmDevicePtr dev;
char *addr;
int ret;
dev = drmDeviceAlloc(node_type, node, sizeof(drmPciBusInfo),
sizeof(drmPciDeviceInfo), &addr);
if (!dev)
return -ENOMEM;
dev->bustype = DRM_BUS_PCI;
dev->businfo.pci = (drmPciBusInfoPtr)addr;
ret = drmParsePciBusInfo(maj, min, dev->businfo.pci);
if (ret)
goto free_device;
// Fetch the device info if the user has requested it
if (fetch_deviceinfo) {
addr += sizeof(drmPciBusInfo);
dev->deviceinfo.pci = (drmPciDeviceInfoPtr)addr;
ret = drmParsePciDeviceInfo(maj, min, dev->deviceinfo.pci, flags);
if (ret)
goto free_device;
}
*device = dev;
return 0;
free_device:
free(dev);
return ret;
}
static int drmParseUsbBusInfo(int maj, int min, drmUsbBusInfoPtr info)
{
#ifdef __linux__
char path[PATH_MAX + 1], *value;
unsigned int bus, dev;
int ret;
snprintf(path, sizeof(path), "/sys/dev/char/%d:%d/device", maj, min);
value = sysfs_uevent_get(path, "BUSNUM");
if (!value)
return -ENOENT;
ret = sscanf(value, "%03u", &bus);
free(value);
if (ret <= 0)
return -errno;
value = sysfs_uevent_get(path, "DEVNUM");
if (!value)
return -ENOENT;
ret = sscanf(value, "%03u", &dev);
free(value);
if (ret <= 0)
return -errno;
info->bus = bus;
info->dev = dev;
return 0;
#else
#warning "Missing implementation of drmParseUsbBusInfo"
return -EINVAL;
#endif
}
static int drmParseUsbDeviceInfo(int maj, int min, drmUsbDeviceInfoPtr info)
{
#ifdef __linux__
char path[PATH_MAX + 1], *value;
unsigned int vendor, product;
int ret;
snprintf(path, sizeof(path), "/sys/dev/char/%d:%d/device", maj, min);
value = sysfs_uevent_get(path, "PRODUCT");
if (!value)
return -ENOENT;
ret = sscanf(value, "%x/%x", &vendor, &product);
free(value);
if (ret <= 0)
return -errno;
info->vendor = vendor;
info->product = product;
return 0;
#else
#warning "Missing implementation of drmParseUsbDeviceInfo"
return -EINVAL;
#endif
}
static int drmProcessUsbDevice(drmDevicePtr *device, const char *node,
int node_type, int maj, int min,
bool fetch_deviceinfo, uint32_t flags)
{
drmDevicePtr dev;
char *ptr;
int ret;
dev = drmDeviceAlloc(node_type, node, sizeof(drmUsbBusInfo),
sizeof(drmUsbDeviceInfo), &ptr);
if (!dev)
return -ENOMEM;
dev->bustype = DRM_BUS_USB;
dev->businfo.usb = (drmUsbBusInfoPtr)ptr;
ret = drmParseUsbBusInfo(maj, min, dev->businfo.usb);
if (ret < 0)
goto free_device;
if (fetch_deviceinfo) {
ptr += sizeof(drmUsbBusInfo);
dev->deviceinfo.usb = (drmUsbDeviceInfoPtr)ptr;
ret = drmParseUsbDeviceInfo(maj, min, dev->deviceinfo.usb);
if (ret < 0)
goto free_device;
}
*device = dev;
return 0;
free_device:
free(dev);
return ret;
}
static int drmParsePlatformBusInfo(int maj, int min, drmPlatformBusInfoPtr info)
{
#ifdef __linux__
char path[PATH_MAX + 1], *name;
snprintf(path, sizeof(path), "/sys/dev/char/%d:%d/device", maj, min);
name = sysfs_uevent_get(path, "OF_FULLNAME");
if (!name)
return -ENOENT;
strncpy(info->fullname, name, DRM_PLATFORM_DEVICE_NAME_LEN);
info->fullname[DRM_PLATFORM_DEVICE_NAME_LEN - 1] = '\0';
free(name);
return 0;
#else
#warning "Missing implementation of drmParsePlatformBusInfo"
return -EINVAL;
#endif
}
static int drmParsePlatformDeviceInfo(int maj, int min,
drmPlatformDeviceInfoPtr info)
{
#ifdef __linux__
char path[PATH_MAX + 1], *value;
unsigned int count, i;
int err;
snprintf(path, sizeof(path), "/sys/dev/char/%d:%d/device", maj, min);
value = sysfs_uevent_get(path, "OF_COMPATIBLE_N");
if (!value)
return -ENOENT;
sscanf(value, "%u", &count);
free(value);
info->compatible = calloc(count + 1, sizeof(*info->compatible));
if (!info->compatible)
return -ENOMEM;
for (i = 0; i < count; i++) {
value = sysfs_uevent_get(path, "OF_COMPATIBLE_%u", i);
if (!value) {
err = -ENOENT;
goto free;
}
info->compatible[i] = value;
}
return 0;
free:
while (i--)
free(info->compatible[i]);
free(info->compatible);
return err;
#else
#warning "Missing implementation of drmParsePlatformDeviceInfo"
return -EINVAL;
#endif
}
static int drmProcessPlatformDevice(drmDevicePtr *device,
const char *node, int node_type,
int maj, int min, bool fetch_deviceinfo,
uint32_t flags)
{
drmDevicePtr dev;
char *ptr;
int ret;
dev = drmDeviceAlloc(node_type, node, sizeof(drmPlatformBusInfo),
sizeof(drmPlatformDeviceInfo), &ptr);
if (!dev)
return -ENOMEM;
dev->bustype = DRM_BUS_PLATFORM;
dev->businfo.platform = (drmPlatformBusInfoPtr)ptr;
ret = drmParsePlatformBusInfo(maj, min, dev->businfo.platform);
if (ret < 0)
goto free_device;
if (fetch_deviceinfo) {
ptr += sizeof(drmPlatformBusInfo);
dev->deviceinfo.platform = (drmPlatformDeviceInfoPtr)ptr;
ret = drmParsePlatformDeviceInfo(maj, min, dev->deviceinfo.platform);
if (ret < 0)
goto free_device;
}
*device = dev;
return 0;
free_device:
free(dev);
return ret;
}
static int drmParseHost1xBusInfo(int maj, int min, drmHost1xBusInfoPtr info)
{
#ifdef __linux__
char path[PATH_MAX + 1], *name;
snprintf(path, sizeof(path), "/sys/dev/char/%d:%d/device", maj, min);
name = sysfs_uevent_get(path, "OF_FULLNAME");
if (!name)
return -ENOENT;
strncpy(info->fullname, name, DRM_HOST1X_DEVICE_NAME_LEN);
info->fullname[DRM_HOST1X_DEVICE_NAME_LEN - 1] = '\0';
free(name);
return 0;
#else
#warning "Missing implementation of drmParseHost1xBusInfo"
return -EINVAL;
#endif
}
static int drmParseHost1xDeviceInfo(int maj, int min,
drmHost1xDeviceInfoPtr info)
{
#ifdef __linux__
char path[PATH_MAX + 1], *value;
unsigned int count, i;
int err;
snprintf(path, sizeof(path), "/sys/dev/char/%d:%d/device", maj, min);
value = sysfs_uevent_get(path, "OF_COMPATIBLE_N");
if (!value)
return -ENOENT;
sscanf(value, "%u", &count);
free(value);
info->compatible = calloc(count + 1, sizeof(*info->compatible));
if (!info->compatible)
return -ENOMEM;
for (i = 0; i < count; i++) {
value = sysfs_uevent_get(path, "OF_COMPATIBLE_%u", i);
if (!value) {
err = -ENOENT;
goto free;
}
info->compatible[i] = value;
}
return 0;
free:
while (i--)
free(info->compatible[i]);
free(info->compatible);
return err;
#else
#warning "Missing implementation of drmParseHost1xDeviceInfo"
return -EINVAL;
#endif
}
static int drmProcessHost1xDevice(drmDevicePtr *device,
const char *node, int node_type,
int maj, int min, bool fetch_deviceinfo,
uint32_t flags)
{
drmDevicePtr dev;
char *ptr;
int ret;
dev = drmDeviceAlloc(node_type, node, sizeof(drmHost1xBusInfo),
sizeof(drmHost1xDeviceInfo), &ptr);
if (!dev)
return -ENOMEM;
dev->bustype = DRM_BUS_HOST1X;
dev->businfo.host1x = (drmHost1xBusInfoPtr)ptr;
ret = drmParseHost1xBusInfo(maj, min, dev->businfo.host1x);
if (ret < 0)
goto free_device;
if (fetch_deviceinfo) {
ptr += sizeof(drmHost1xBusInfo);
dev->deviceinfo.host1x = (drmHost1xDeviceInfoPtr)ptr;
ret = drmParseHost1xDeviceInfo(maj, min, dev->deviceinfo.host1x);
if (ret < 0)
goto free_device;
}
*device = dev;
return 0;
free_device:
free(dev);
return ret;
}
static int
process_device(drmDevicePtr *device, const char *d_name,
int req_subsystem_type,
bool fetch_deviceinfo, uint32_t flags)
{
struct stat sbuf;
char node[PATH_MAX + 1];
int node_type, subsystem_type;
unsigned int maj, min;
node_type = drmGetNodeType(d_name);
if (node_type < 0)
return -1;
snprintf(node, PATH_MAX, "%s/%s", DRM_DIR_NAME, d_name);
if (stat(node, &sbuf))
return -1;
maj = major(sbuf.st_rdev);
min = minor(sbuf.st_rdev);
if (!drmNodeIsDRM(maj, min) || !S_ISCHR(sbuf.st_mode))
return -1;
subsystem_type = drmParseSubsystemType(maj, min);
if (req_subsystem_type != -1 && req_subsystem_type != subsystem_type)
return -1;
switch (subsystem_type) {
case DRM_BUS_PCI:
case DRM_BUS_VIRTIO:
return drmProcessPciDevice(device, node, node_type, maj, min,
fetch_deviceinfo, flags);
case DRM_BUS_USB:
return drmProcessUsbDevice(device, node, node_type, maj, min,
fetch_deviceinfo, flags);
case DRM_BUS_PLATFORM:
return drmProcessPlatformDevice(device, node, node_type, maj, min,
fetch_deviceinfo, flags);
case DRM_BUS_HOST1X:
return drmProcessHost1xDevice(device, node, node_type, maj, min,
fetch_deviceinfo, flags);
default:
return -1;
}
}
/* Consider devices located on the same bus as duplicate and fold the respective
* entries into a single one.
*
* Note: this leaves "gaps" in the array, while preserving the length.
*/
static void drmFoldDuplicatedDevices(drmDevicePtr local_devices[], int count)
{
int node_type, i, j;
for (i = 0; i < count; i++) {
for (j = i + 1; j < count; j++) {
if (drmDevicesEqual(local_devices[i], local_devices[j])) {
local_devices[i]->available_nodes |= local_devices[j]->available_nodes;
node_type = log2(local_devices[j]->available_nodes);
memcpy(local_devices[i]->nodes[node_type],
local_devices[j]->nodes[node_type], drmGetMaxNodeName());
drmFreeDevice(&local_devices[j]);
}
}
}
}
/* Check that the given flags are valid returning 0 on success */
static int
drm_device_validate_flags(uint32_t flags)
{
return (flags & ~DRM_DEVICE_GET_PCI_REVISION);
}
static bool
drm_device_has_rdev(drmDevicePtr device, dev_t find_rdev)
{
struct stat sbuf;
for (int i = 0; i < DRM_NODE_MAX; i++) {
if (device->available_nodes & 1 << i) {
if (stat(device->nodes[i], &sbuf) == 0 &&
sbuf.st_rdev == find_rdev)
return true;
}
}
return false;
}
/*
* The kernel drm core has a number of places that assume maximum of
* 3x64 devices nodes. That's 64 for each of primary, control and
* render nodes. Rounded it up to 256 for simplicity.
*/
#define MAX_DRM_NODES 256
/**
* Get information about the opened drm device
*
* \param fd file descriptor of the drm device
* \param flags feature/behaviour bitmask
* \param device the address of a drmDevicePtr where the information
* will be allocated in stored
*
* \return zero on success, negative error code otherwise.
*
* \note Unlike drmGetDevice it does not retrieve the pci device revision field
* unless the DRM_DEVICE_GET_PCI_REVISION \p flag is set.
*/
drm_public int drmGetDevice2(int fd, uint32_t flags, drmDevicePtr *device)
{
#ifdef __OpenBSD__
/*
* DRI device nodes on OpenBSD are not in their own directory, they reside
* in /dev along with a large number of statically generated /dev nodes.
* Avoid stat'ing all of /dev needlessly by implementing this custom path.
*/
drmDevicePtr d;
struct stat sbuf;
char node[PATH_MAX + 1];
const char *dev_name;
int node_type, subsystem_type;
int maj, min, n, ret, base;
if (fd == -1 || device == NULL)
return -EINVAL;
if (fstat(fd, &sbuf))
return -errno;
maj = major(sbuf.st_rdev);
min = minor(sbuf.st_rdev);
if (!drmNodeIsDRM(maj, min) || !S_ISCHR(sbuf.st_mode))
return -EINVAL;
node_type = drmGetMinorType(min);
if (node_type == -1)
return -ENODEV;
switch (node_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;
};
base = drmGetMinorBase(node_type);
if (base < 0)
return -EINVAL;
n = snprintf(node, PATH_MAX, dev_name, DRM_DIR_NAME, min - base);
if (n == -1 || n >= PATH_MAX)
return -errno;
if (stat(node, &sbuf))
return -EINVAL;
subsystem_type = drmParseSubsystemType(maj, min);
if (subsystem_type != DRM_BUS_PCI)
return -ENODEV;
ret = drmProcessPciDevice(&d, node, node_type, maj, min, true, flags);
if (ret)
return ret;
*device = d;
return 0;
#else
drmDevicePtr local_devices[MAX_DRM_NODES];
drmDevicePtr d;
DIR *sysdir;
struct dirent *dent;
struct stat sbuf;
int subsystem_type;
int maj, min;
int ret, i, node_count;
dev_t find_rdev;
if (drm_device_validate_flags(flags))
return -EINVAL;
if (fd == -1 || device == NULL)
return -EINVAL;
if (fstat(fd, &sbuf))
return -errno;
find_rdev = sbuf.st_rdev;
maj = major(sbuf.st_rdev);
min = minor(sbuf.st_rdev);
if (!drmNodeIsDRM(maj, min) || !S_ISCHR(sbuf.st_mode))
return -EINVAL;
subsystem_type = drmParseSubsystemType(maj, min);
if (subsystem_type < 0)
return subsystem_type;
sysdir = opendir(DRM_DIR_NAME);
if (!sysdir)
return -errno;
i = 0;
while ((dent = readdir(sysdir))) {
ret = process_device(&d, dent->d_name, subsystem_type, true, flags);
if (ret)
continue;
if (i >= MAX_DRM_NODES) {
fprintf(stderr, "More than %d drm nodes detected. "
"Please report a bug - that should not happen.\n"
"Skipping extra nodes\n", MAX_DRM_NODES);
break;
}
local_devices[i] = d;
i++;
}
node_count = i;
drmFoldDuplicatedDevices(local_devices, node_count);
*device = NULL;
for (i = 0; i < node_count; i++) {
if (!local_devices[i])
continue;
if (drm_device_has_rdev(local_devices[i], find_rdev))
*device = local_devices[i];
else
drmFreeDevice(&local_devices[i]);
}
closedir(sysdir);
if (*device == NULL)
return -ENODEV;
return 0;
#endif
}
/**
* Get information about the opened drm device
*
* \param fd file descriptor of the drm device
* \param device the address of a drmDevicePtr where the information
* will be allocated in stored
*
* \return zero on success, negative error code otherwise.
*/
drm_public int drmGetDevice(int fd, drmDevicePtr *device)
{
return drmGetDevice2(fd, DRM_DEVICE_GET_PCI_REVISION, device);
}
/**
* Get drm devices on the system
*
* \param flags feature/behaviour bitmask
* \param devices the array of devices with drmDevicePtr elements
* can be NULL to get the device number first
* \param max_devices the maximum number of devices for the array
*
* \return on error - negative error code,
* if devices is NULL - total number of devices available on the system,
* alternatively the number of devices stored in devices[], which is
* capped by the max_devices.
*
* \note Unlike drmGetDevices it does not retrieve the pci device revision field
* unless the DRM_DEVICE_GET_PCI_REVISION \p flag is set.
*/
drm_public int drmGetDevices2(uint32_t flags, drmDevicePtr devices[],
int max_devices)
{
drmDevicePtr local_devices[MAX_DRM_NODES];
drmDevicePtr device;
DIR *sysdir;
struct dirent *dent;
int ret, i, node_count, device_count;
if (drm_device_validate_flags(flags))
return -EINVAL;
sysdir = opendir(DRM_DIR_NAME);
if (!sysdir)
return -errno;
i = 0;
while ((dent = readdir(sysdir))) {
ret = process_device(&device, dent->d_name, -1, devices != NULL, flags);
if (ret)
continue;
if (i >= MAX_DRM_NODES) {
fprintf(stderr, "More than %d drm nodes detected. "
"Please report a bug - that should not happen.\n"
"Skipping extra nodes\n", MAX_DRM_NODES);
break;
}
local_devices[i] = device;
i++;
}
node_count = i;
drmFoldDuplicatedDevices(local_devices, node_count);
device_count = 0;
for (i = 0; i < node_count; i++) {
if (!local_devices[i])
continue;
if ((devices != NULL) && (device_count < max_devices))
devices[device_count] = local_devices[i];
else
drmFreeDevice(&local_devices[i]);
device_count++;
}
closedir(sysdir);
return device_count;
}
/**
* Get drm devices on the system
*
* \param devices the array of devices with drmDevicePtr elements
* can be NULL to get the device number first
* \param max_devices the maximum number of devices for the array
*
* \return on error - negative error code,
* if devices is NULL - total number of devices available on the system,
* alternatively the number of devices stored in devices[], which is
* capped by the max_devices.
*/
drm_public int drmGetDevices(drmDevicePtr devices[], int max_devices)
{
return drmGetDevices2(DRM_DEVICE_GET_PCI_REVISION, devices, max_devices);
}
drm_public char *drmGetDeviceNameFromFd2(int fd)
{
#ifdef __linux__
struct stat sbuf;
char path[PATH_MAX + 1], *value;
unsigned int maj, min;
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(path, sizeof(path), "/sys/dev/char/%d:%d", maj, min);
value = sysfs_uevent_get(path, "DEVNAME");
if (!value)
return NULL;
snprintf(path, sizeof(path), "/dev/%s", value);
free(value);
return strdup(path);
#else
struct stat sbuf;
char node[PATH_MAX + 1];
const char *dev_name;
int node_type;
int maj, min, 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;
node_type = drmGetMinorType(min);
if (node_type == -1)
return NULL;
switch (node_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(node_type);
if (base < 0)
return NULL;
n = snprintf(node, PATH_MAX, dev_name, DRM_DIR_NAME, min - base);
if (n == -1 || n >= PATH_MAX)
return NULL;
return strdup(node);
#endif
}
drm_public int drmSyncobjCreate(int fd, uint32_t flags, uint32_t *handle)
{
struct drm_syncobj_create args;
int ret;
memclear(args);
args.flags = flags;
args.handle = 0;
ret = drmIoctl(fd, DRM_IOCTL_SYNCOBJ_CREATE, &args);
if (ret)
return ret;
*handle = args.handle;
return 0;
}
drm_public int drmSyncobjDestroy(int fd, uint32_t handle)
{
struct drm_syncobj_destroy args;
memclear(args);
args.handle = handle;
return drmIoctl(fd, DRM_IOCTL_SYNCOBJ_DESTROY, &args);
}
drm_public int drmSyncobjHandleToFD(int fd, uint32_t handle, int *obj_fd)
{
struct drm_syncobj_handle args;
int ret;
memclear(args);
args.fd = -1;
args.handle = handle;
ret = drmIoctl(fd, DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD, &args);
if (ret)
return ret;
*obj_fd = args.fd;
return 0;
}
drm_public int drmSyncobjFDToHandle(int fd, int obj_fd, uint32_t *handle)
{
struct drm_syncobj_handle args;
int ret;
memclear(args);
args.fd = obj_fd;
args.handle = 0;
ret = drmIoctl(fd, DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, &args);
if (ret)
return ret;
*handle = args.handle;
return 0;
}
drm_public int drmSyncobjImportSyncFile(int fd, uint32_t handle,
int sync_file_fd)
{
struct drm_syncobj_handle args;
memclear(args);
args.fd = sync_file_fd;
args.handle = handle;
args.flags = DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE;
return drmIoctl(fd, DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, &args);
}
drm_public int drmSyncobjExportSyncFile(int fd, uint32_t handle,
int *sync_file_fd)
{
struct drm_syncobj_handle args;
int ret;
memclear(args);
args.fd = -1;
args.handle = handle;
args.flags = DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE;
ret = drmIoctl(fd, DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD, &args);
if (ret)
return ret;
*sync_file_fd = args.fd;
return 0;
}
drm_public int drmSyncobjWait(int fd, uint32_t *handles, unsigned num_handles,
int64_t timeout_nsec, unsigned flags,
uint32_t *first_signaled)
{
struct drm_syncobj_wait args;
int ret;
memclear(args);
args.handles = (uintptr_t)handles;
args.timeout_nsec = timeout_nsec;
args.count_handles = num_handles;
args.flags = flags;
ret = drmIoctl(fd, DRM_IOCTL_SYNCOBJ_WAIT, &args);
if (ret < 0)
return -errno;
if (first_signaled)
*first_signaled = args.first_signaled;
return ret;
}
drm_public int drmSyncobjReset(int fd, const uint32_t *handles,
uint32_t handle_count)
{
struct drm_syncobj_array args;
int ret;
memclear(args);
args.handles = (uintptr_t)handles;
args.count_handles = handle_count;
ret = drmIoctl(fd, DRM_IOCTL_SYNCOBJ_RESET, &args);
return ret;
}
drm_public int drmSyncobjSignal(int fd, const uint32_t *handles,
uint32_t handle_count)
{
struct drm_syncobj_array args;
int ret;
memclear(args);
args.handles = (uintptr_t)handles;
args.count_handles = handle_count;
ret = drmIoctl(fd, DRM_IOCTL_SYNCOBJ_SIGNAL, &args);
return ret;
}
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