diff options
Diffstat (limited to 'libdrm/xf86drm.c')
| -rw-r--r-- | libdrm/xf86drm.c | 108 |
1 files changed, 90 insertions, 18 deletions
diff --git a/libdrm/xf86drm.c b/libdrm/xf86drm.c index 2e3c9b43..1174a0fa 100644 --- a/libdrm/xf86drm.c +++ b/libdrm/xf86drm.c @@ -1,7 +1,8 @@ /* xf86drm.c -- User-level interface to DRM device * Created: Tue Jan 5 08:16:21 1999 by faith@precisioninsight.com * - * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. + * 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 @@ -23,8 +24,9 @@ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. * - * Author: Rickard E. (Rik) Faith <faith@precisioninsight.com> - * + * Authors: Rickard E. (Rik) Faith <faith@valinux.com> + * Kevin E. Martin <martin@valinux.com> + * * $XFree86: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/xf86drm.c,v 1.10 2000/02/23 04:47:23 martin Exp $ * */ @@ -71,10 +73,23 @@ extern int xf86RemoveSIGIOHandler(int fd); #define MAP_FAILED ((void *)-1) #endif -#include <sys/sysmacros.h> /* for makedev() */ #include "xf86drm.h" #include "drm.h" +#define DRM_FIXED_DEVICE_MAJOR 145 + +#ifdef __linux__ +#include <sys/sysmacros.h> /* for makedev() */ +#endif + +#ifndef makedev + /* This definition needs to be changed on + some systems if dev_t is a structure. + If there is a header file we can get it + from, there would be best. */ +#define makedev(x,y) ((dev_t)(((x) << 8) | (y))) +#endif + static void *drmHashTable = NULL; /* Context switch callbacks */ typedef struct drmHashEntry { @@ -95,9 +110,16 @@ void drmFree(void *pt) if (pt) _DRM_FREE(pt); } +/* drmStrdup can't use strdup(3), since it doesn't call _DRM_MALLOC... */ static char *drmStrdup(const char *s) { - return s ? strdup(s) : NULL; + char *retval = NULL; + + if (s) { + retval = _DRM_MALLOC(strlen(s)+1); + strcpy(retval, s); + } + return retval; } @@ -134,7 +156,7 @@ static drmHashEntry *drmGetEntry(int fd) return entry; } -/* drm_open is used to open the /dev/drm device */ +/* drm_open is used to open the /dev/dri device */ static int drm_open(const char *file) { @@ -144,14 +166,6 @@ static int drm_open(const char *file) return -errno; } -/* drmAvailable looks for /proc/dri, and returns 1 if it is present. */ - -int drmAvailable(void) -{ - if (!access("/proc/dri/0", R_OK)) return 1; - return 0; -} - static int drmOpenDevice(const char *path, long dev, mode_t mode, uid_t user, gid_t group) { @@ -161,7 +175,16 @@ static int drmOpenDevice(const char *path, long dev, struct stat st; #endif - if (!stat(path, &st) && st.st_rdev == dev) return drm_open(path); + /* Fiddle mode to remove execute bits */ + mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH); + + if (!stat(path, &st) && st.st_rdev == dev) { + if (!geteuid()) { + chown(path, user, group); + chmod(path, mode); + } + return drm_open(path); + } if (geteuid()) return DRM_ERR_NOT_ROOT; remove(path); @@ -174,6 +197,38 @@ static int drmOpenDevice(const char *path, long dev, return drm_open(path); } +/* drmAvailable looks for /proc/dri, and returns 1 if it is present. On + OSs that do not have a Linux-like /proc, this information will not be + available, and we'll have to create a device and check if the driver is + loaded that way. */ + +int drmAvailable(void) +{ + char dev_name[64]; + drmVersionPtr version; + int retval = 0; + int fd; + + if (!access("/proc/dri/0", R_OK)) return 1; + + sprintf(dev_name, "/dev/dri-temp-%d", getpid()); + + remove(dev_name); + if ((fd = drmOpenDevice(dev_name, makedev(DRM_FIXED_DEVICE_MAJOR, 0), + S_IRUSR, geteuid(), getegid())) >= 0) { + /* Read version to make sure this is + actually a DRI device. */ + if ((version = drmGetVersion(fd))) { + retval = 1; + drmFreeVersion(version); + } + close(fd); + } + remove(dev_name); + + return retval; +} + static int drmOpenByBusid(const char *busid) { int i; @@ -268,7 +323,24 @@ static int drmOpenByName(const char *name) } } } - } else remove(dev_name); + } else { + drmVersionPtr version; + /* /proc/dri not available, possibly + because we aren't on a Linux system. + So, try to create the next device and + see if it's active. */ + dev = makedev(DRM_FIXED_DEVICE_MAJOR, i); + if ((fd = drmOpenDevice(dev_name, dev, mode, user, group))) { + if ((version = drmGetVersion(fd))) { + if (!strcmp(version->name, name)) { + drmFreeVersion(version); + return fd; + } + drmFreeVersion(version); + } + } + remove(dev_name); + } } return -1; } @@ -303,7 +375,7 @@ static void drmFreeKernelVersion(drm_version_t *v) drmFree(v); } -static void drmCopyVersion(drmVersionPtr d, drm_version_t *s) +static void drmCopyVersion(drmVersionPtr d, const drm_version_t *s) { d->version_major = s->version_major; d->version_minor = s->version_minor; @@ -317,7 +389,7 @@ static void drmCopyVersion(drmVersionPtr d, drm_version_t *s) } /* drmVersion obtains the version information via an ioctl. Similar - * information is available via /proc/drm. */ + * information is available via /proc/dri. */ drmVersionPtr drmGetVersion(int fd) { |