From b3a5766992019fc5f44cc9afd01b2617b76f47a7 Mon Sep 17 00:00:00 2001 From: Daryll Strauss Date: Sun, 5 Dec 1999 01:19:48 +0000 Subject: Initial revision --- libdrm/xf86drm.c | 1114 ++++++++++++++++++++++++++++++++++++++++++++++++ libdrm/xf86drmHash.c | 435 +++++++++++++++++++ libdrm/xf86drmRandom.c | 219 ++++++++++ libdrm/xf86drmSL.c | 490 +++++++++++++++++++++ 4 files changed, 2258 insertions(+) create mode 100644 libdrm/xf86drm.c create mode 100644 libdrm/xf86drmHash.c create mode 100644 libdrm/xf86drmRandom.c create mode 100644 libdrm/xf86drmSL.c (limited to 'libdrm') diff --git a/libdrm/xf86drm.c b/libdrm/xf86drm.c new file mode 100644 index 00000000..50b421af --- /dev/null +++ b/libdrm/xf86drm.c @@ -0,0 +1,1114 @@ +/* xf86drm.c -- User-level interface to DRM device + * Created: Tue Jan 5 08:16:21 1999 by faith@precisioninsight.com + * Revised: Fri Jun 18 09:52:23 1999 by faith@precisioninsight.com + * + * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. + * 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. + * + * $PI: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/xf86drm.c,v 1.41 1999/06/21 14:31:20 faith Exp $ + * $XFree86: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/xf86drm.c,v 1.3 1999/06/27 14:08:19 dawes Exp $ + * + */ + +#ifdef XFree86Server +# include "xf86.h" +# include "xf86_OSproc.h" +# include "xf86_ansic.h" +# include "xf86Priv.h" +# define _DRM_MALLOC xalloc +# define _DRM_FREE xfree +# ifndef XFree86LOADER +# include +# include +# endif +#else +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# ifdef DRM_USE_MALLOC +# define _DRM_MALLOC malloc +# define _DRM_FREE free +extern int xf86InstallSIGIOHandler(int fd, void (*f)(int)); +extern int xf86RemoveSIGIOHandler(int fd); +# else +# include +# define _DRM_MALLOC Xmalloc +# define _DRM_FREE Xfree +# endif +#endif + +/* Not all systems have MAP_FAILED defined */ +#ifndef MAP_FAILED +#define MAP_FAILED ((void *)-1) +#endif + +#include /* for makedev() */ +#include "xf86drm.h" +#include "drm.h" + +static void *drmHashTable = NULL; /* Context switch callbacks */ + +typedef struct drmHashEntry { + int fd; + void (*f)(int, void *, void *); + void *tagTable; +} drmHashEntry; + +void *drmMalloc(int size) +{ + void *pt; + if ((pt = _DRM_MALLOC(size))) memset(pt, 0, size); + return pt; +} + +void drmFree(void *pt) +{ + if (pt) _DRM_FREE(pt); +} + +static char *drmStrdup(const char *s) +{ + return s ? strdup(s) : NULL; +} + + +/* drm_lookup searches file for a line tagged with name, and returns the + value for that tag. If busid is NULL, the file format is that used for + /proc/devices and /proc/misc, or the first part of /proc/drm/devices: + + + + If the busid is non-NULL, the file format is the extended format used + for /proc/drm/devices: + + + + If both name and busid are non-NULL, both must match. If either is + NULL, then the other is matched. +*/ + +static int drm_lookup(const char *file, const char *name, const char *busid) +{ + FILE *str; + char buf[128]; + char *pt; + int name_match; + int busid_match; + char *namept = NULL; + char *busidpt = NULL; + + if (!(str = fopen(file, "r"))) return DRM_ERR_NO_DEVICE; + while (fgets(buf, sizeof(buf)-1, str)) { + buf[sizeof(buf)-1] = '\0'; + for (pt = buf; *pt && isspace(*pt); ++pt); /* skip whitespace */ + for (; *pt && !isspace(*pt); ++pt); /* next space or null */ + if (isspace(pt[0]) && pt[1]) { + pt++; + for (; *pt && isspace(*pt); ++pt); /* skip whitespace */ + namept = pt; + for (; *pt && !isspace(*pt); ++pt); /* next space or null */ + if (isspace(pt[0]) && pt[1]) { /* busid present */ + *pt = '\0'; /* proper termination */ + pt++; + for (; *pt && isspace(*pt); ++pt); /* skip whitespace */ + busidpt = pt; + for (; *pt && !isspace(*pt); ++pt); /* next space or null */ + } + *pt = '\0'; /* proper termination */ + name_match = name ? 0 : 1; /* match if we don't care */ + busid_match = busid ? 0 : 1; /* match if we don't care */ + if (name && namept && !strcmp(name, namept)) ++name_match; + if (busid && busidpt && !strcmp(busid, busidpt)) ++busid_match; + if (name_match && busid_match) { + fclose(str); + return atoi(buf); /* stops at whitespace */ + } + } + } + fclose(str); + return DRM_ERR_NO_DEVICE; +} + +static unsigned long drmGetKeyFromFd(int fd) +{ +#ifdef XFree86LOADER + struct xf86stat st; +#else + struct stat st; +#endif + + st.st_rdev = 0; + fstat(fd, &st); + return st.st_rdev; +} + +static 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; +} + +/* drm_open is used to open the /dev/drm device */ + +static int drm_open(const char *file) +{ + int fd = open(file, O_RDWR, 0); + + if (fd >= 0) return fd; + return -errno; +} + +/* drmAvailable looks for /proc/drm, and returns 1 if it is present. */ + +int drmAvailable(void) +{ + if (!access(DRM_PROC_DRM, R_OK)) return 1; + return 0; +} + +/* drmGetMajor tries to find the major device number for /dev/drm by + searching /proc/devices. A negative value is returned on error. */ + +static int drmGetMajor(void) +{ + int major; + + if (!drmAvailable()) return DRM_ERR_NO_DEVICE; + + if ((major = drm_lookup(DRM_PROC_DEVICES, DRM_NAME, NULL)) >= 0) + return major; + + return DRM_ERR_NO_DEVICE; +} + +/* drmGetMinor tries to find the minor device number for name by looking in + /proc/drm/devices. A negative value is retruned on error. */ + +static int drmGetMinor(const char *name, const char *busid) +{ + int minor; + char buf[128]; + + if (!drmAvailable()) return DRM_ERR_NO_DEVICE; + + sprintf(buf, "/proc/%s/%s", DRM_NAME, DRM_DEVICES); + + if ((minor = drm_lookup(buf, name, busid))) return minor; + return 0; +} + + +/* drmOpen looks up the specified name and/or busid in /proc/drm/devices, + and opens the device found. The entry in /dev is created if necessary + (and if root). A file descriptor is returned. On error, the return + value is negative. */ + +static int drmOpen(const char *name, const char *busid) +{ +#ifdef XFree86LOADER + struct xf86stat st; +#else + struct stat st; +#endif + char path[128]; + int major; + int minor; + dev_t dev; + + if (!drmAvailable()) return DRM_ERR_NO_DEVICE; + if ((major = drmGetMajor()) < 0) return major; + if ((minor = drmGetMinor(name,busid)) < 0) return minor; + dev = makedev(major, minor); + + if (!minor) { + sprintf(path, "/dev/%s", DRM_NAME ); + } else { + sprintf(path, "/dev/%s%d", DRM_NAME, minor-1 ); + } + + /* Check device major/minor for match */ + if (!access(path, F_OK)) { + if (stat(path, &st)) return DRM_ERR_NO_ACCESS; + if (st.st_rdev == dev) { +#if defined(XFree86Server) + chmod(path, + xf86ConfigDRI.mode ? xf86ConfigDRI.mode : DRM_DEV_MODE); + chown(path, DRM_DEV_UID, + xf86ConfigDRI.group ? xf86ConfigDRI.group : DRM_DEV_GID); +#endif +#if defined(DRM_USE_MALLOC) + chmod(path, DRM_DEV_MODE); + chown(path, DRM_DEV_UID, DRM_DEV_GID); +#endif + return drm_open(path); + } + } + + /* Doesn't exist or match failed, so we + have to be root to create it. */ + if (geteuid()) return DRM_ERR_NOT_ROOT; + remove(path); + if (mknod(path, S_IFCHR | DRM_DEV_MODE, dev)) { + remove(path); + return DRM_ERR_NOT_ROOT; + } +#if defined(XFree86Server) + chmod(path, xf86ConfigDRI.mode ? xf86ConfigDRI.mode : DRM_DEV_MODE); + chown(path, DRM_DEV_UID, + xf86ConfigDRI.group ? xf86ConfigDRI.group : DRM_DEV_GID); +#endif +#if defined(DRM_USE_MALLOC) + chmod(path, DRM_DEV_MODE); + chown(path, DRM_DEV_UID, DRM_DEV_GID); +#endif + return drm_open(path); +} + +/* drmOpenDRM returns a file descriptor for the main /dev/drm control + device. The entry in /dev is created if necessary (and if root). A + file descriptor is returned. On error, the return value is negative. */ + +int drmOpenDRM(void) +{ + return drmOpen(DRM_NAME, NULL); +} + + +/* drmClose closes the file descriptor returned from drmOpen. */ + +int drmCloseDRM(int fd) +{ + return close(fd); +} + +void drmFreeVersion(drmVersionPtr v) +{ + if (!v) return; + if (v->name) drmFree(v->name); + if (v->date) drmFree(v->date); + if (v->desc) drmFree(v->desc); + drmFree(v); +} + +static void drmFreeKernelVersion(drm_version_t *v) +{ + if (!v) return; + if (v->name) drmFree(v->name); + if (v->date) drmFree(v->date); + if (v->desc) drmFree(v->desc); + drmFree(v); +} + +static void drmCopyVersion(drmVersionPtr d, 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 = drmStrdup(s->name); + d->date_len = s->date_len; + d->date = drmStrdup(s->date); + d->desc_len = s->desc_len; + d->desc = drmStrdup(s->desc); +} + +/* drmVersion obtains the version information via an ioctl. Similar + * information is available via /proc/drm. */ + +drmVersionPtr drmGetVersion(int fd) +{ + drmVersionPtr retval; + drm_version_t *version = drmMalloc(sizeof(*version)); + + /* First, get the lengths */ + version->name_len = 0; + version->name = NULL; + version->date_len = 0; + version->date = NULL; + version->desc_len = 0; + version->desc = NULL; + + if (ioctl(fd, DRM_IOCTL_VERSION, version)) { + drmFreeKernelVersion(version); + return NULL; + } + + /* Now, allocate space and get the data */ + 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 (ioctl(fd, DRM_IOCTL_VERSION, version)) { + 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'; + + /* Now, copy it all back into the + client-visible data structure... */ + retval = drmMalloc(sizeof(*retval)); + drmCopyVersion(retval, version); + drmFreeKernelVersion(version); + return retval; +} + +void drmFreeVersionList(drmListPtr list) +{ + int i; + + if (!list) return; + if (list->version) { + for (i = 0; i < list->count; i++) { + if (list->version[i].name) drmFree(list->version[i].name); + if (list->version[i].date) drmFree(list->version[i].date); + if (list->version[i].desc) drmFree(list->version[i].desc); + + } + drmFree(list->version); + } + if (list->capability) drmFree(list->capability); + drmFree(list); +} + +static void drmFreeKernelVersionList(drm_list_t *list) +{ + int i; + + if (!list) return; + if (list->version) { + for (i = 0; i < list->count; i++) { + if (list->version[i].name) drmFree(list->version[i].name); + if (list->version[i].date) drmFree(list->version[i].date); + if (list->version[i].desc) drmFree(list->version[i].desc); + + } + drmFree(list->version); + } + drmFree(list); +} + +/* drmList obtains a list of all drivers and capabilities via an ioctl. */ + +drmListPtr drmGetVersionList(int fd) +{ + drmListPtr retval; + drm_list_t *list = drmMalloc(sizeof(*list)); + int i; + + list->count = 0; + + /* First, get the count */ + + if (ioctl(fd, DRM_IOCTL_LIST, list)) { + drmFreeKernelVersionList(list); + return NULL; + } + + /* Next, get the version sizes */ + for (i = 0; i < list->count; i++) { + list->version + = drmMalloc(list->count * sizeof(*list->version)); + list->version[i].name_len = 0; + list->version[i].name = NULL; + list->version[i].date_len = 0; + list->version[i].date = NULL; + list->version[i].desc_len = 0; + list->version[i].desc = NULL; + } + + if (ioctl(fd, DRM_IOCTL_LIST, list)) { + drmFreeKernelVersionList(list); + return NULL; + } + + /* Now, allocate space and get the data */ + for (i = 0; i < list->count; i++) { + if (list->version[i].name_len) + list->version[i].name = drmMalloc(list->version[i].name_len + 1); + if (list->version[i].date_len) + list->version[i].date = drmMalloc(list->version[i].date_len + 1); + if (list->version[i].desc_len) + list->version[i].desc = drmMalloc(list->version[i].desc_len + 1); + } + + if (ioctl(fd, DRM_IOCTL_LIST, list)) { + drmFreeKernelVersionList(list); + return NULL; + } + + /* The results might not be null-terminated + strings, so terminate them. */ + + for (i = 0; i < list->count; i++) { + if (list->version[i].name_len) + list->version[i].name[list->version[i].name_len] = '\0'; + if (list->version[i].date_len) + list->version[i].date[list->version[i].date_len] = '\0'; + if (list->version[i].desc_len) + list->version[i].desc[list->version[i].desc_len] = '\0'; + } + + /* Now, copy it all back into the + client-visible data structure... */ + retval = drmMalloc(sizeof(*retval)); + retval->count = list->count; + retval->version = drmMalloc(list->count * sizeof(*retval->version)); + retval->capability = drmMalloc(list->count * sizeof(*retval->capability)); + for (i = 0; i < list->count; i++) { + drmCopyVersion(&retval->version[i], &list->version[i]); + } + drmFreeKernelVersionList(list); + return retval; +} + +int drmCreateSub(int fd, const char *name, const char *busid) +{ + drm_request_t request; + + request.device_name = name; + request.device_busid = busid; + if (ioctl(fd, DRM_IOCTL_CREATE, &request)) { + return -errno; + } + return 0; +} + +int drmDestroySub(int fd, const char *busid) +{ + drm_request_t request; + + request.device_busid = busid; + request.device_major = drmGetMajor(); + request.device_minor = drmGetMinor(NULL, busid); + if (ioctl(fd, DRM_IOCTL_DESTROY, &request)) { + return -errno; + } + return 0; +} + +int drmGetMagic(int fd, drmMagicPtr magic) +{ + drm_auth_t auth; + + *magic = 0; + if (ioctl(fd, DRM_IOCTL_GET_MAGIC, &auth)) return -errno; + *magic = auth.magic; + return 0; +} + +int drmAuthMagic(int fd, drmMagic magic) +{ + drm_auth_t auth; + + auth.magic = magic; + if (ioctl(fd, DRM_IOCTL_AUTH_MAGIC, &auth)) return -errno; + return 0; +} + +int drmAddMap(int fd, + drmHandle offset, + drmSize size, + drmMapType type, + drmMapFlags flags, + drmHandlePtr handle) +{ + drm_map_t map; + + map.offset = offset; + map.size = size; + map.handle = 0; + map.type = type; + map.flags = flags; + if (ioctl(fd, DRM_IOCTL_ADD_MAP, &map)) return -errno; + if (handle) *handle = (drmHandle)map.handle; + return 0; +} + +int drmAddBufs(int fd, int count, int size, int flags) +{ + drm_buf_desc_t request; + + request.count = count; + request.size = size; + request.low_mark = 0; + request.high_mark = 0; + request.flags = flags; + if (ioctl(fd, DRM_IOCTL_ADD_BUFS, &request)) return -errno; + return request.count; +} + +int drmMarkBufs(int fd, double low, double high) +{ + drm_buf_info_t info; + int i; + + info.count = 0; + info.list = NULL; + + if (ioctl(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 (ioctl(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 (ioctl(fd, DRM_IOCTL_MARK_BUFS, &info.list[i])) { + int retval = -errno; + drmFree(info.list); + return retval; + } + } + drmFree(info.list); + + return 0; +} + +int drmFreeBufs(int fd, int count, int *list) +{ + drm_buf_free_t request; + + request.count = count; + request.list = list; + if (ioctl(fd, DRM_IOCTL_FREE_BUFS, &request)) return -errno; + return 0; +} + +int drmOpenSub(const char *busid) +{ + return drmOpen(NULL, busid); +} + +int drmCloseSub(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); +} + +int drmMap(int fd, + drmHandle handle, + drmSize size, + drmAddressPtr address) +{ + if (fd < 0) return -EINVAL; + *address = mmap(0, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, handle); + if (*address == MAP_FAILED) return -errno; + return 0; +} + +int drmUnmap(drmAddress address, drmSize size) +{ + return munmap(address, size); +} + +drmBufInfoPtr drmGetBufInfo(int fd) +{ + drm_buf_info_t info; + drmBufInfoPtr retval; + int i; + + info.count = 0; + info.list = NULL; + + if (ioctl(fd, DRM_IOCTL_INFO_BUFS, &info)) return NULL; + + if (info.count) { + if (!(info.list = drmMalloc(info.count * sizeof(*info.list)))) + return NULL; + + if (ioctl(fd, DRM_IOCTL_INFO_BUFS, &info)) { + drmFree(info.list); + return NULL; + } + /* Now, copy it all back into the + client-visible data structure... */ + 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; +} + +drmBufMapPtr drmMapBufs(int fd) +{ + drm_buf_map_t bufs; + drmBufMapPtr retval; + int i; + + bufs.count = 0; + bufs.list = NULL; + if (ioctl(fd, DRM_IOCTL_MAP_BUFS, &bufs)) return NULL; + + if (bufs.count) { + if (!(bufs.list = drmMalloc(bufs.count * sizeof(*bufs.list)))) + return NULL; + + if (ioctl(fd, DRM_IOCTL_MAP_BUFS, &bufs)) { + drmFree(bufs.list); + return NULL; + } + /* Now, copy it all back into the + client-visible data structure... */ + 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; + } + return retval; + } + return NULL; +} + +int drmUnmapBufs(drmBufMapPtr bufs) +{ + int i; + + for (i = 0; i < bufs->count; i++) { + munmap(bufs->list[i].address, bufs->list[i].total); + } + return 0; +} + +int drmDMA(int fd, drmDMAReqPtr request) +{ + drm_dma_t dma; + + /* Copy to hidden structure */ + 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; + if (ioctl(fd, DRM_IOCTL_DMA, &dma)) return -errno; + request->granted_count = dma.granted_count; + + return 0; +} + +int drmGetLock(int fd, drmContext context, drmLockFlags flags) +{ + drm_lock_t 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 (ioctl(fd, DRM_IOCTL_LOCK, &lock)) + ; + return 0; +} + +int drmUnlock(int fd, drmContext context) +{ + drm_lock_t lock; + + lock.context = context; + lock.flags = 0; + return ioctl(fd, DRM_IOCTL_UNLOCK, &lock); +} + +drmContextPtr drmGetReservedContextList(int fd, int *count) +{ + drm_ctx_res_t res; + drm_ctx_t *list; + drmContextPtr retval; + int i; + + res.count = 0; + res.contexts = NULL; + if (ioctl(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)))) { + drmFree(list); + return NULL; + } + + res.contexts = list; + if (ioctl(fd, DRM_IOCTL_RES_CTX, &res)) return NULL; + + for (i = 0; i < res.count; i++) retval[i] = list[i].handle; + drmFree(list); + + *count = res.count; + return retval; +} + +void drmFreeReservedContextList(drmContextPtr pt) +{ + drmFree(pt); +} + +int drmCreateContext(int fd, drmContextPtr handle) +{ + drm_ctx_t ctx; + + ctx.flags = 0; /* Modified with functions below */ + if (ioctl(fd, DRM_IOCTL_ADD_CTX, &ctx)) return -errno; + *handle = ctx.handle; + return 0; +} + +int drmSwitchToContext(int fd, drmContext context) +{ + drm_ctx_t ctx; + + ctx.handle = context; + if (ioctl(fd, DRM_IOCTL_SWITCH_CTX, &ctx)) return -errno; + return 0; +} + +int drmSetContextFlags(int fd, drmContext context, drmContextFlags flags) +{ + drm_ctx_t ctx; + + /* Context preserving means that no context + switched 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. */ + ctx.handle = context; + ctx.flags = 0; + if (flags & DRM_CONTEXT_PRESERVED) ctx.flags |= _DRM_CONTEXT_PRESERVED; + if (flags & DRM_CONTEXT_2DONLY) ctx.flags |= _DRM_CONTEXT_2DONLY; + if (ioctl(fd, DRM_IOCTL_MOD_CTX, &ctx)) return -errno; + return 0; +} + +int drmGetContextFlags(int fd, drmContext context, drmContextFlagsPtr flags) +{ + drm_ctx_t ctx; + + ctx.handle = context; + if (ioctl(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; +} + +int drmDestroyContext(int fd, drmContext handle) +{ + drm_ctx_t ctx; + ctx.handle = handle; + if (ioctl(fd, DRM_IOCTL_RM_CTX, &ctx)) return -errno; + return 0; +} + +int drmCreateDrawable(int fd, drmDrawablePtr handle) +{ + drm_draw_t draw; + if (ioctl(fd, DRM_IOCTL_ADD_DRAW, &draw)) return -errno; + *handle = draw.handle; + return 0; +} + +int drmDestroyDrawable(int fd, drmDrawable handle) +{ + drm_draw_t draw; + draw.handle = handle; + if (ioctl(fd, DRM_IOCTL_RM_DRAW, &draw)) return -errno; + return 0; +} + +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; +} + +int drmCtlAddCommand(int fd, drmCtlDesc desc, int count, int *inst) +{ + drm_control_t ctl; + + ctl.func = DRM_ADD_COMMAND; + ctl.irq = 0; + ctl.count = count; + ctl.inst = inst; + + switch (desc) { + case DRM_IH_PRE_INST: ctl.desc = _DRM_IH_PRE_INST; break; + case DRM_IH_POST_INST: ctl.desc = _DRM_IH_POST_INST; break; + case DRM_IH_SERVICE: ctl.desc = _DRM_IH_SERVICE; break; + case DRM_IH_PRE_UNINST: ctl.desc = _DRM_IH_PRE_UNINST; break; + case DRM_IH_POST_UNINST: ctl.desc = _DRM_IH_POST_UNINST; break; + case DRM_DMA_DISPATCH: ctl.desc = _DRM_DMA_DISPATCH; break; + case DRM_DMA_READY: ctl.desc = _DRM_DMA_READY; break; + case DRM_DMA_IS_READY: ctl.desc = _DRM_DMA_IS_READY; break; + case DRM_DMA_QUIESCENT: ctl.desc = _DRM_DMA_QUIESCENT; break; + default: + return -EINVAL; + } + + if (ioctl(fd, DRM_IOCTL_CONTROL, &ctl)) return -errno; + return 0; +} + +int drmCtlRemoveCommands(int fd) +{ + drm_control_t ctl; + drm_desc_t i; + + for (i = 0; i < DRM_DESC_MAX; i++) { + ctl.func = DRM_RM_COMMAND; + ctl.desc = i; + ctl.irq = 0; + ctl.count = 0; + ctl.inst = NULL; + ioctl(fd, DRM_IOCTL_CONTROL, &ctl); + } + return 0; +} + +int drmCtlInstHandler(int fd, int irq) +{ + drm_control_t ctl; + + ctl.func = DRM_INST_HANDLER; + ctl.desc = 0; /* unused */ + ctl.irq = irq; + ctl.count = 0; + ctl.inst = NULL; + if (ioctl(fd, DRM_IOCTL_CONTROL, &ctl)) return -errno; + return 0; +} + +int drmCtlUninstHandler(int fd) +{ + drm_control_t ctl; + + ctl.func = DRM_UNINST_HANDLER; + ctl.desc = 0; /* unused */ + ctl.irq = 0; + ctl.count = 0; + ctl.inst = NULL; + if (ioctl(fd, DRM_IOCTL_CONTROL, &ctl)) return -errno; + return 0; +} + +int drmFinish(int fd, int context, drmLockFlags flags) +{ + drm_lock_t 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; + if (ioctl(fd, DRM_IOCTL_FINISH, &lock)) return -errno; + return 0; +} + +int drmGetInterruptFromBusID(int fd, int busnum, int devnum, int funcnum) +{ + drm_irq_busid_t p; + + p.busnum = busnum; + p.devnum = devnum; + p.funcnum = funcnum; + if (ioctl(fd, DRM_IOCTL_IRQ_BUSID, &p)) return -errno; + return p.irq; +} + +int drmAddContextTag(int fd, drmContext context, void *tag) +{ + drmHashEntry *entry = drmGetEntry(fd); + + if (drmHashInsert(entry->tagTable, context, tag)) { + drmHashDelete(entry->tagTable, context); + drmHashInsert(entry->tagTable, context, tag); + } + return 0; +} + +int drmDelContextTag(int fd, drmContext context) +{ + drmHashEntry *entry = drmGetEntry(fd); + + return drmHashDelete(entry->tagTable, context); +} + +void *drmGetContextTag(int fd, drmContext context) +{ + drmHashEntry *entry = drmGetEntry(fd); + void *value; + + if (drmHashLookup(entry->tagTable, context, &value)) return NULL; + + return value; +} + +#if defined(XFree86Server) || defined(DRM_USE_MALLOC) +static void drmSIGIOHandler(int interrupt) +{ + unsigned long key; + void *value; + ssize_t count; + drm_ctx_t ctx; + typedef void (*_drmCallback)(int, void *, void *); + char buf[256]; + drmContext old; + drmContext new; + void *oldctx; + void *newctx; + char *pt; + drmHashEntry *entry; + + if (!drmHashTable) return; + if (drmHashFirst(drmHashTable, &key, &value)) { + entry = value; + do { +#if 0 + fprintf(stderr, "Trying %d\n", entry->fd); +#endif + if ((count = read(entry->fd, buf, sizeof(buf)))) { + buf[count] = '\0'; +#if 0 + fprintf(stderr, "Got %s\n", buf); +#endif + + for (pt = buf; *pt != ' '; ++pt); /* Find first space */ + ++pt; + old = strtol(pt, &pt, 0); + new = strtol(pt, NULL, 0); + oldctx = drmGetContextTag(entry->fd, old); + newctx = drmGetContextTag(entry->fd, new); +#if 0 + fprintf(stderr, "%d %d %p %p\n", old, new, oldctx, newctx); +#endif + ((_drmCallback)entry->f)(entry->fd, oldctx, newctx); + ctx.handle = new; + ioctl(entry->fd, DRM_IOCTL_NEW_CTX, &ctx); + } + } while (drmHashNext(drmHashTable, &key, &value)); + } +} + +int drmInstallSIGIOHandler(int fd, void (*f)(int, void *, void *)) +{ + drmHashEntry *entry; + + entry = drmGetEntry(fd); + entry->f = f; + + return xf86InstallSIGIOHandler(fd, drmSIGIOHandler); +} + +int drmRemoveSIGIOHandler(int fd) +{ + drmHashEntry *entry = drmGetEntry(fd); + + entry->f = NULL; + + return xf86RemoveSIGIOHandler(fd); +} +#endif diff --git a/libdrm/xf86drmHash.c b/libdrm/xf86drmHash.c new file mode 100644 index 00000000..a3c9481b --- /dev/null +++ b/libdrm/xf86drmHash.c @@ -0,0 +1,435 @@ +/* xf86drmHash.c -- Small hash table support for integer -> integer mapping + * Created: Sun Apr 18 09:35:45 1999 by faith@precisioninsight.com + * Revised: Thu Jun 3 16:11:06 1999 by faith@precisioninsight.com + * + * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. + * 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. + * + * $PI: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/xf86drmHash.c,v 1.3 1999/06/07 13:01:42 faith Exp $ + * $XFree86: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/xf86drmHash.c,v 1.1 1999/06/14 07:32:02 dawes Exp $ + * + * DESCRIPTION + * + * This file contains a straightforward implementation of a fixed-sized + * hash table using self-organizing linked lists [Knuth73, pp. 398-399] for + * collision resolution. There are two potentially interesting things + * about this implementation: + * + * 1) The table is power-of-two sized. Prime sized tables are more + * traditional, but do not have a significant advantage over power-of-two + * sized table, especially when double hashing is not used for collision + * resolution. + * + * 2) The hash computation uses a table of random integers [Hanson97, + * pp. 39-41]. + * + * FUTURE ENHANCEMENTS + * + * With a table size of 512, the current implementation is sufficient for a + * few hundred keys. Since this is well above the expected size of the + * tables for which this implementation was designed, the implementation of + * dynamic hash tables was postponed until the need arises. A common (and + * naive) approach to dynamic hash table implementation simply creates a + * new hash table when necessary, rehashes all the data into the new table, + * and destroys the old table. The approach in [Larson88] is superior in + * two ways: 1) only a portion of the table is expanded when needed, + * distributing the expansion cost over several insertions, and 2) portions + * of the table can be locked, enabling a scalable thread-safe + * implementation. + * + * REFERENCES + * + * [Hanson97] David R. Hanson. C Interfaces and Implementations: + * Techniques for Creating Reusable Software. Reading, Massachusetts: + * Addison-Wesley, 1997. + * + * [Knuth73] Donald E. Knuth. The Art of Computer Programming. Volume 3: + * Sorting and Searching. Reading, Massachusetts: Addison-Wesley, 1973. + * + * [Larson88] Per-Ake Larson. "Dynamic Hash Tables". CACM 31(4), April + * 1988, pp. 446-457. + * + */ + +#define HASH_MAIN 0 + +#if HASH_MAIN +# include +# include +#else +# include "xf86drm.h" +# ifdef XFree86LOADER +# include "xf86.h" +# include "xf86_ansic.h" +# else +# include +# include +# endif +#endif + +#define N(x) drm##x + +#define HASH_MAGIC 0xdeadbeef +#define HASH_DEBUG 0 +#define HASH_SIZE 512 /* Good for about 100 entries */ + /* If you change this value, you probably + have to change the HashHash hashing + function! */ + +#if HASH_MAIN +#define HASH_ALLOC malloc +#define HASH_FREE free +#define HASH_RANDOM_DECL +#define HASH_RANDOM_INIT(seed) srandom(seed) +#define HASH_RANDOM random() +#else +#define HASH_ALLOC drmMalloc +#define HASH_FREE drmFree +#define HASH_RANDOM_DECL void *state +#define HASH_RANDOM_INIT(seed) state = drmRandomCreate(seed) +#define HASH_RANDOM drmRandom(state) + +#endif + +typedef struct HashBucket { + unsigned long key; + void *value; + struct HashBucket *next; +} HashBucket, *HashBucketPtr; + +typedef struct HashTable { + unsigned long magic; + unsigned long entries; + unsigned long hits; /* At top of linked list */ + unsigned long partials; /* Not at top of linked list */ + unsigned long misses; /* Not in table */ + HashBucketPtr buckets[HASH_SIZE]; + int p0; + HashBucketPtr p1; +} HashTable, *HashTablePtr; + +#if HASH_MAIN +extern void *N(HashCreate)(void); +extern int N(HashDestroy)(void *t); +extern int N(HashLookup)(void *t, unsigned long key, unsigned long *value); +extern int N(HashInsert)(void *t, unsigned long key, unsigned long value); +extern int N(HashDelete)(void *t, unsigned long key); +#endif + +static unsigned long HashHash(unsigned long key) +{ + unsigned long hash = 0; + unsigned long tmp = key; + static int init = 0; + static unsigned long scatter[256]; + int i; + + if (!init) { + HASH_RANDOM_DECL; + HASH_RANDOM_INIT(37); + for (i = 0; i < 256; i++) scatter[i] = HASH_RANDOM; + ++init; + } + + while (tmp) { + hash = (hash << 1) + scatter[tmp & 0xff]; + tmp >>= 8; + } + + hash %= HASH_SIZE; +#if HASH_DEBUG + printf( "Hash(%d) = %d\n", key, hash); +#endif + return hash; +} + +void *N(HashCreate)(void) +{ + HashTablePtr table; + int i; + + table = HASH_ALLOC(sizeof(*table)); + if (!table) return NULL; + table->magic = HASH_MAGIC; + table->entries = 0; + table->hits = 0; + table->partials = 0; + table->misses = 0; + + for (i = 0; i < HASH_SIZE; i++) table->buckets[i] = NULL; + return table; +} + +int N(HashDestroy)(void *t) +{ + HashTablePtr table = (HashTablePtr)t; + HashBucketPtr bucket; + HashBucketPtr next; + int i; + + if (table->magic != HASH_MAGIC) return -1; /* Bad magic */ + + for (i = 0; i < HASH_SIZE; i++) { + for (bucket = table->buckets[i]; bucket;) { + next = bucket->next; + HASH_FREE(bucket); + bucket = next; + } + } + HASH_FREE(table); + return 0; +} + +/* Find the bucket and organize the list so that this bucket is at the + top. */ + +static HashBucketPtr HashFind(HashTablePtr table, + unsigned long key, unsigned long *h) +{ + unsigned long hash = HashHash(key); + HashBucketPtr prev = NULL; + HashBucketPtr bucket; + + if (h) *h = hash; + + for (bucket = table->buckets[hash]; bucket; bucket = bucket->next) { + if (bucket->key == key) { + if (prev) { + /* Organize */ + prev->next = bucket->next; + bucket->next = table->buckets[hash]; + table->buckets[hash] = bucket; + ++table->partials; + } else { + ++table->hits; + } + return bucket; + } + prev = bucket; + } + ++table->misses; + return NULL; +} + +int N(HashLookup)(void *t, unsigned long key, void **value) +{ + HashTablePtr table = (HashTablePtr)t; + HashBucketPtr bucket; + + if (table->magic != HASH_MAGIC) return -1; /* Bad magic */ + + bucket = HashFind(table, key, NULL); + if (!bucket) return 1; /* Not found */ + *value = bucket->value; + return 0; /* Found */ +} + +int N(HashInsert)(void *t, unsigned long key, void *value) +{ + HashTablePtr table = (HashTablePtr)t; + HashBucketPtr bucket; + unsigned long hash; + + if (table->magic != HASH_MAGIC) return -1; /* Bad magic */ + + if (HashFind(table, key, &hash)) return 1; /* Already in table */ + + bucket = HASH_ALLOC(sizeof(*bucket)); + if (!bucket) return -1; /* Error */ + bucket->key = key; + bucket->value = value; + bucket->next = table->buckets[hash]; + table->buckets[hash] = bucket; +#if HASH_DEBUG + printf("Inserted %d at %d/%p\n", key, hash, bucket); +#endif + return 0; /* Added to table */ +} + +int N(HashDelete)(void *t, unsigned long key) +{ + HashTablePtr table = (HashTablePtr)t; + unsigned long hash; + HashBucketPtr bucket; + + if (table->magic != HASH_MAGIC) return -1; /* Bad magic */ + + bucket = HashFind(table, key, &hash); + + if (!bucket) return 1; /* Not found */ + + table->buckets[hash] = bucket->next; + HASH_FREE(bucket); + return 0; +} + +int N(HashNext)(void *t, unsigned long *key, void **value) +{ + HashTablePtr table = (HashTablePtr)t; + + for (; table->p0 < HASH_SIZE; + ++table->p0, table->p1 = table->buckets[table->p0]) { + if (table->p1) { + *key = table->p1->key; + *value = table->p1->value; + table->p1 = table->p1->next; + return 1; + } + } + return 0; +} + +int N(HashFirst)(void *t, unsigned long *key, void **value) +{ + HashTablePtr table = (HashTablePtr)t; + + if (table->magic != HASH_MAGIC) return -1; /* Bad magic */ + + table->p0 = 0; + table->p1 = table->buckets[0]; + return N(HashNext)(table, key, value); +} + +#if HASH_MAIN +#define DIST_LIMIT 10 +static int dist[DIST_LIMIT]; + +static void clear_dist(void) { + int i; + + for (i = 0; i < DIST_LIMIT; i++) dist[i] = 0; +} + +static int count_entries(HashBucketPtr bucket) +{ + int count = 0; + + for (; bucket; bucket = bucket->next) ++count; + return count; +} + +static void update_dist(int count) +{ + if (count >= DIST_LIMIT) ++dist[DIST_LIMIT-1]; + else ++dist[count]; +} + +static void compute_dist(HashTablePtr table) +{ + int i; + HashBucketPtr bucket; + + printf("Entries = %ld, hits = %ld, partials = %ld, misses = %ld\n", + table->entries, table->hits, table->partials, table->misses); + clear_dist(); + for (i = 0; i < HASH_SIZE; i++) { + bucket = table->buckets[i]; + update_dist(count_entries(bucket)); + } + for (i = 0; i < DIST_LIMIT; i++) { + if (i != DIST_LIMIT-1) printf("%5d %10d\n", i, dist[i]); + else printf("other %10d\n", dist[i]); + } +} + +static void check_table(HashTablePtr table, + unsigned long key, unsigned long value) +{ + unsigned long retval = 0; + int retcode = N(HashLookup)(table, key, &retval); + + switch (retcode) { + case -1: + printf("Bad magic = 0x%08lx:" + " key = %lu, expected = %lu, returned = %lu\n", + table->magic, key, value, retval); + break; + case 1: + printf("Not found: key = %lu, expected = %lu returned = %lu\n", + key, value, retval); + break; + case 0: + if (value != retval) + printf("Bad value: key = %lu, expected = %lu, returned = %lu\n", + key, value, retval); + break; + default: + printf("Bad retcode = %d: key = %lu, expected = %lu, returned = %lu\n", + retcode, key, value, retval); + break; + } +} + +int main(void) +{ + HashTablePtr table; + int i; + + printf("\n***** 256 consecutive integers ****\n"); + table = N(HashCreate)(); + for (i = 0; i < 256; i++) N(HashInsert)(table, i, i); + for (i = 0; i < 256; i++) check_table(table, i, i); + for (i = 256; i >= 0; i--) check_table(table, i, i); + compute_dist(table); + N(HashDestroy)(table); + + printf("\n***** 1024 consecutive integers ****\n"); + table = N(HashCreate)(); + for (i = 0; i < 1024; i++) N(HashInsert)(table, i, i); + for (i = 0; i < 1024; i++) check_table(table, i, i); + for (i = 1024; i >= 0; i--) check_table(table, i, i); + compute_dist(table); + N(HashDestroy)(table); + + printf("\n***** 1024 consecutive page addresses (4k pages) ****\n"); + table = N(HashCreate)(); + for (i = 0; i < 1024; i++) N(HashInsert)(table, i*4096, i); + for (i = 0; i < 1024; i++) check_table(table, i*4096, i); + for (i = 1024; i >= 0; i--) check_table(table, i*4096, i); + compute_dist(table); + N(HashDestroy)(table); + + printf("\n***** 1024 random integers ****\n"); + table = N(HashCreate)(); + srandom(0xbeefbeef); + for (i = 0; i < 1024; i++) N(HashInsert)(table, random(), i); + srandom(0xbeefbeef); + for (i = 0; i < 1024; i++) check_table(table, random(), i); + srandom(0xbeefbeef); + for (i = 0; i < 1024; i++) check_table(table, random(), i); + compute_dist(table); + N(HashDestroy)(table); + + printf("\n***** 5000 random integers ****\n"); + table = N(HashCreate)(); + srandom(0xbeefbeef); + for (i = 0; i < 5000; i++) N(HashInsert)(table, random(), i); + srandom(0xbeefbeef); + for (i = 0; i < 5000; i++) check_table(table, random(), i); + srandom(0xbeefbeef); + for (i = 0; i < 5000; i++) check_table(table, random(), i); + compute_dist(table); + N(HashDestroy)(table); + + return 0; +} +#endif diff --git a/libdrm/xf86drmRandom.c b/libdrm/xf86drmRandom.c new file mode 100644 index 00000000..dad836d0 --- /dev/null +++ b/libdrm/xf86drmRandom.c @@ -0,0 +1,219 @@ +/* xf86drmRandom.c -- "Minimal Standard" PRNG Implementation + * Created: Mon Apr 19 08:28:13 1999 by faith@precisioninsight.com + * Revised: Thu Jun 24 14:53:45 1999 by faith@precisioninsight.com + * + * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. + * 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. + * + * $PI: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/xf86drmRandom.c,v 1.4 1999/06/24 18:54:55 faith Exp $ + * $XFree86: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/xf86drmRandom.c,v 1.2 1999/06/27 14:08:20 dawes Exp $ + * + * DESCRIPTION + * + * This file contains a simple, straightforward implementation of the Park + * & Miller "Minimal Standard" PRNG [PM88, PMS93], which is a Lehmer + * multiplicative linear congruential generator (MLCG) with a period of + * 2^31-1. + * + * This implementation is intended to provide a reliable, portable PRNG + * that is suitable for testing a hash table implementation and for + * implementing skip lists. + * + * FUTURE ENHANCEMENTS + * + * If initial seeds are not selected randomly, two instances of the PRNG + * can be correlated. [Knuth81, pp. 32-33] describes a shuffling technique + * that can eliminate this problem. + * + * If PRNGs are used for simulation, the period of the current + * implementation may be too short. [LE88] discusses methods of combining + * MLCGs to produce much longer periods, and suggests some alternative + * values for A and M. [LE90 and Sch92] also provide information on + * long-period PRNGs. + * + * REFERENCES + * + * [Knuth81] Donald E. Knuth. The Art of Computer Programming. Volume 2: + * Seminumerical Algorithms. Reading, Massachusetts: Addison-Wesley, 1981. + * + * [LE88] Pierre L'Ecuyer. "Efficient and Portable Combined Random Number + * Generators". CACM 31(6), June 1988, pp. 742-774. + * + * [LE90] Pierre L'Ecuyer. "Random Numbers for Simulation". CACM 33(10, + * October 1990, pp. 85-97. + * + * [PM88] Stephen K. Park and Keith W. Miller. "Random Number Generators: + * Good Ones are Hard to Find". CACM 31(10), October 1988, pp. 1192-1201. + * + * [Sch92] Bruce Schneier. "Pseudo-Ransom Sequence Generator for 32-Bit + * CPUs". Dr. Dobb's Journal 17(2), February 1992, pp. 34, 37-38, 40. + * + * [PMS93] Stephen K. Park, Keith W. Miller, and Paul K. Stockmeyer. In + * "Technical Correspondence: Remarks on Choosing and Implementing Random + * Number Generators". CACM 36(7), July 1993, pp. 105-110. + * + */ + +#define RANDOM_MAIN 0 + +#if RANDOM_MAIN +# include +# include +#else +# include "xf86drm.h" +# ifdef XFree86LOADER +# include "xf86.h" +# include "xf86_ansic.h" +# else +# include +# include +# endif +#endif + +#define N(x) drm##x + +#define RANDOM_MAGIC 0xfeedbeef +#define RANDOM_DEBUG 0 + +#if RANDOM_MAIN +#define RANDOM_ALLOC malloc +#define RANDOM_FREE free +#else +#define RANDOM_ALLOC drmMalloc +#define RANDOM_FREE drmFree +#endif + +typedef struct RandomState { + unsigned long magic; + unsigned long a; + unsigned long m; + unsigned long q; /* m div a */ + unsigned long r; /* m mod a */ + unsigned long check; + long seed; +} RandomState; + +#if RANDOM_MAIN +extern void *N(RandomCreate)(unsigned long seed); +extern int N(RandomDestroy)(void *state); +extern unsigned long N(Random)(void *state); +extern double N(RandomDouble)(void *state); +#endif + +void *N(RandomCreate)(unsigned long seed) +{ + RandomState *state; + + state = RANDOM_ALLOC(sizeof(*state)); + if (!state) return NULL; + state->magic = RANDOM_MAGIC; +#if 0 + /* Park & Miller, October 1988 */ + state->a = 16807; + state->m = 2147483647; + state->check = 1043618065; /* After 10000 iterations */ +#else + /* Park, Miller, and Stockmeyer, July 1993 */ + state->a = 48271; + state->m = 2147483647; + state->check = 399268537; /* After 10000 iterations */ +#endif + state->q = state->m / state->a; + state->r = state->m % state->a; + + state->seed = seed; + /* Check for illegal boundary conditions, + and choose closest legal value. */ + if (state->seed <= 0) state->seed = 1; + if (state->seed >= state->m) state->seed = state->m - 1; + + return state; +} + +int N(RandomDestroy)(void *state) +{ + RANDOM_FREE(state); + return 0; +} + +unsigned long N(Random)(void *state) +{ + RandomState *s = (RandomState *)state; + long hi; + long lo; + + hi = s->seed / s->q; + lo = s->seed % s->q; + s->seed = s->a * lo - s->r * hi; + if (s->seed <= 0) s->seed += s->m; + + return s->seed; +} + +double N(RandomDouble)(void *state) +{ + RandomState *s = (RandomState *)state; + + return (double)N(Random)(state)/(double)s->m; +} + +#if RANDOM_MAIN +static void check_period(long seed) +{ + unsigned long count = 0; + unsigned long initial; + void *state; + + state = N(RandomCreate)(seed); + initial = N(Random)(state); + ++count; + while (initial != N(Random)(state)) { + if (!++count) break; + } + printf("With seed of %10ld, period = %10lu (0x%08lx)\n", + seed, count, count); + N(RandomDestroy)(state); +} + +int main(void) +{ + RandomState *state; + int i; + unsigned long rand; + + state = N(RandomCreate)(1); + for (i = 0; i < 10000; i++) { + rand = N(Random)(state); + } + printf("After 10000 iterations: %lu (%lu expected): %s\n", + rand, state->check, + rand - state->check ? "*INCORRECT*" : "CORRECT"); + N(RandomDestroy)(state); + + printf("Checking periods...\n"); + check_period(1); + check_period(2); + check_period(31415926); + + return 0; +} +#endif diff --git a/libdrm/xf86drmSL.c b/libdrm/xf86drmSL.c new file mode 100644 index 00000000..d5dd63da --- /dev/null +++ b/libdrm/xf86drmSL.c @@ -0,0 +1,490 @@ +/* xf86drmSL.c -- Skip list support + * Created: Mon May 10 09:28:13 1999 by faith@precisioninsight.com + * Revised: Thu Jun 3 16:13:01 1999 by faith@precisioninsight.com + * + * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. + * 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. + * + * $PI: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/xf86drmSL.c,v 1.2 1999/06/07 13:01:42 faith Exp $ + * $XFree86: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/xf86drmSL.c,v 1.1 1999/06/14 07:32:02 dawes Exp $ + * + * DESCRIPTION + * + * This file contains a straightforward skip list implementation.n + * + * FUTURE ENHANCEMENTS + * + * REFERENCES + * + * [Pugh90] William Pugh. Skip Lists: A Probabilistic Alternative to + * Balanced Trees. CACM 33(6), June 1990, pp. 668-676. + * + */ + +#define SL_MAIN 0 + +#if SL_MAIN +# include +# include +# include +#else +# include "xf86drm.h" +# ifdef XFree86LOADER +# include "xf86.h" +# include "xf86_ansic.h" +# else +# include +# include +# endif +#endif + +#define N(x) drm##x + +#define SL_LIST_MAGIC 0xfacade00LU +#define SL_ENTRY_MAGIC 0x00fab1edLU +#define SL_FREED_MAGIC 0xdecea5edLU +#define SL_MAX_LEVEL 16 +#define SL_DEBUG 0 +#define SL_RANDOM_SEED 0xc01055a1LU + +#if SL_MAIN +#define SL_ALLOC malloc +#define SL_FREE free +#define SL_RANDOM_DECL static int state = 0; +#define SL_RANDOM_INIT(seed) if (!state) { srandom(seed); ++state; } +#define SL_RANDOM random() +#else +#define SL_ALLOC drmMalloc +#define SL_FREE drmFree +#define SL_RANDOM_DECL static void *state = NULL +#define SL_RANDOM_INIT(seed) if (!state) state = drmRandomCreate(seed) +#define SL_RANDOM drmRandom(state) + +#endif + +typedef struct SLEntry { + unsigned long magic; /* SL_ENTRY_MAGIC */ + unsigned long key; + void *value; + int levels; + struct SLEntry *forward[1]; /* variable sized array */ +} SLEntry, *SLEntryPtr; + +typedef struct SkipList { + unsigned long magic; /* SL_LIST_MAGIC */ + int level; + int count; + SLEntryPtr head; + SLEntryPtr p0; /* Position for iteration */ +} SkipList, *SkipListPtr; + +#if SL_MAIN +extern void *N(SLCreate)(void); +extern int N(SLDestroy)(void *l); +extern int N(SLLookup)(void *l, unsigned long key, void **value); +extern int N(SLInsert)(void *l, unsigned long key, void *value); +extern int N(SLDelete)(void *l, unsigned long key); +extern int N(SLNext)(void *l, unsigned long *key, void **value); +extern int N(SLFirst)(void *l, unsigned long *key, void **value); +extern void N(SLDump)(void *l); +extern int N(SLLookupNeighbors)(void *l, unsigned long key, + unsigned long *prev_key, void **prev_value, + unsigned long *next_key, void **next_value); +#endif + +static SLEntryPtr SLCreateEntry(int max_level, unsigned long key, void *value) +{ + SLEntryPtr entry; + + if (max_level < 0 || max_level > SL_MAX_LEVEL) max_level = SL_MAX_LEVEL; + + entry = SL_ALLOC(sizeof(*entry) + + (max_level + 1) * sizeof(entry->forward[0])); + if (!entry) return NULL; + entry->magic = SL_ENTRY_MAGIC; + entry->key = key; + entry->value = value; + entry->levels = max_level + 1; + + return entry; +} + +static int SLRandomLevel(void) +{ + int level = 1; + SL_RANDOM_DECL; + + SL_RANDOM_INIT(SL_RANDOM_SEED); + + while ((SL_RANDOM & 0x01) && level < SL_MAX_LEVEL) ++level; + return level; +} + +void *N(SLCreate)(void) +{ + SkipListPtr list; + int i; + + list = SL_ALLOC(sizeof(*list)); + if (!list) return NULL; + list->magic = SL_LIST_MAGIC; + list->level = 0; + list->head = SLCreateEntry(SL_MAX_LEVEL, 0, NULL); + list->count = 0; + + for (i = 0; i <= SL_MAX_LEVEL; i++) list->head->forward[i] = NULL; + + return list; +} + +int N(SLDestroy)(void *l) +{ + SkipListPtr list = (SkipListPtr)l; + SLEntryPtr entry; + SLEntryPtr next; + + if (list->magic != SL_LIST_MAGIC) return -1; /* Bad magic */ + + for (entry = list->head; entry; entry = next) { + if (entry->magic != SL_ENTRY_MAGIC) return -1; /* Bad magic */ + next = entry->forward[0]; + entry->magic = SL_FREED_MAGIC; + SL_FREE(entry); + } + + list->magic = SL_FREED_MAGIC; + SL_FREE(list); + return 0; +} + +static SLEntryPtr SLLocate(void *l, unsigned long key, SLEntryPtr *update) +{ + SkipListPtr list = (SkipListPtr)l; + SLEntryPtr entry; + int i; + + if (list->magic != SL_LIST_MAGIC) return NULL; + + for (i = list->level, entry = list->head; i >= 0; i--) { + while (entry->forward[i] && entry->forward[i]->key < key) + entry = entry->forward[i]; + update[i] = entry; + } + + return entry->forward[0]; +} + +int N(SLInsert)(void *l, unsigned long key, void *value) +{ + SkipListPtr list = (SkipListPtr)l; + SLEntryPtr entry; + SLEntryPtr update[SL_MAX_LEVEL + 1]; + int level; + int i; + + if (list->magic != SL_LIST_MAGIC) return -1; /* Bad magic */ + + entry = SLLocate(list, key, update); + + if (entry && entry->key == key) return 1; /* Already in list */ + + + level = SLRandomLevel(); + if (level > list->level) { + level = ++list->level; + update[level] = list->head; + } + + entry = SLCreateEntry(level, key, value); + + /* Fix up forward pointers */ + for (i = 0; i <= level; i++) { + entry->forward[i] = update[i]->forward[i]; + update[i]->forward[i] = entry; + } + + ++list->count; + return 0; /* Added to table */ +} + +int N(SLDelete)(void *l, unsigned long key) +{ + SkipListPtr list = (SkipListPtr)l; + SLEntryPtr update[SL_MAX_LEVEL + 1]; + SLEntryPtr entry; + int i; + + if (list->magic != SL_LIST_MAGIC) return -1; /* Bad magic */ + + entry = SLLocate(list, key, update); + + if (!entry || entry->key != key) return 1; /* Not found */ + + /* Fix up forward pointers */ + for (i = 0; i <= list->level; i++) { + if (update[i]->forward[i] == entry) + update[i]->forward[i] = entry->forward[i]; + } + + entry->magic = SL_FREED_MAGIC; + SL_FREE(entry); + + while (list->level && !list->head->forward[list->level]) --list->level; + --list->count; + return 0; +} + +int N(SLLookup)(void *l, unsigned long key, void **value) +{ + SkipListPtr list = (SkipListPtr)l; + SLEntryPtr update[SL_MAX_LEVEL + 1]; + SLEntryPtr entry; + + entry = SLLocate(list, key, update); + + if (entry && entry->key == key) { + *value = entry; + return 0; + } + *value = NULL; + return -1; +} + +int N(SLLookupNeighbors)(void *l, unsigned long key, + unsigned long *prev_key, void **prev_value, + unsigned long *next_key, void **next_value) +{ + SkipListPtr list = (SkipListPtr)l; + SLEntryPtr update[SL_MAX_LEVEL + 1]; + SLEntryPtr entry; + int retcode = 0; + + entry = SLLocate(list, key, update); + + *prev_key = *next_key = key; + *prev_value = *next_value = NULL; + + if (update[0]) { + *prev_key = update[0]->key; + *prev_value = update[0]->value; + ++retcode; + if (update[0]->forward[0]) { + *next_key = update[0]->forward[0]->key; + *next_value = update[0]->forward[0]->value; + ++retcode; + } + } + return retcode; +} + +int N(SLNext)(void *l, unsigned long *key, void **value) +{ + SkipListPtr list = (SkipListPtr)l; + SLEntryPtr entry; + + if (list->magic != SL_LIST_MAGIC) return -1; /* Bad magic */ + + entry = list->p0; + + if (entry) { + list->p0 = entry->forward[0]; + *key = entry->key; + *value = entry->value; + return 1; + } + list->p0 = NULL; + return 0; +} + +int N(SLFirst)(void *l, unsigned long *key, void **value) +{ + SkipListPtr list = (SkipListPtr)l; + + if (list->magic != SL_LIST_MAGIC) return -1; /* Bad magic */ + + list->p0 = list->head->forward[0]; + return N(SLNext)(list, key, value); +} + +/* Dump internal data structures for debugging. */ +void N(SLDump)(void *l) +{ + SkipListPtr list = (SkipListPtr)l; + SLEntryPtr entry; + int i; + + if (list->magic != SL_LIST_MAGIC) { + printf("Bad magic: 0x%08lx (expected 0x%08lx)\n", + list->magic, SL_LIST_MAGIC); + return; + } + + printf("Level = %d, count = %d\n", list->level, list->count); + for (entry = list->head; entry; entry = entry->forward[0]) { + if (entry->magic != SL_ENTRY_MAGIC) { + printf("Bad magic: 0x%08lx (expected 0x%08lx)\n", + list->magic, SL_ENTRY_MAGIC); + } + printf("\nEntry %p <0x%08lx, %p> has %2d levels\n", + entry, entry->key, entry->value, entry->levels); + for (i = 0; i < entry->levels; i++) { + if (entry->forward[i]) { + printf(" %2d: %p <0x%08lx, %p>\n", + i, + entry->forward[i], + entry->forward[i]->key, + entry->forward[i]->value); + } else { + printf(" %2d: %p\n", i, entry->forward[i]); + } + } + } +} + +#if SL_MAIN +static void print(SkipListPtr list) +{ + unsigned long key; + void *value; + + if (N(SLFirst)(list, &key, &value)) { + do { + printf("key = %5lu, value = %p\n", key, value); + } while (N(SLNext)(list, &key, &value)); + } +} + +static double do_time(int size, int iter) +{ + SkipListPtr list; + int i, j; + unsigned long keys[1000000]; + unsigned long previous; + unsigned long key; + void *value; + struct timeval start, stop; + double usec; + SL_RANDOM_DECL; + + SL_RANDOM_INIT(12345); + + list = N(SLCreate)(); + + for (i = 0; i < size; i++) { + keys[i] = SL_RANDOM; + N(SLInsert)(list, keys[i], NULL); + } + + previous = 0; + if (N(SLFirst)(list, &key, &value)) { + do { + if (key <= previous) { + printf( "%lu !< %lu\n", previous, key); + } + previous = key; + } while (N(SLNext)(list, &key, &value)); + } + + gettimeofday(&start, NULL); + for (j = 0; j < iter; j++) { + for (i = 0; i < size; i++) { + if (N(SLLookup)(list, keys[i], &value)) + printf("Error %lu %d\n", keys[i], i); + } + } + gettimeofday(&stop, NULL); + + usec = (double)(stop.tv_sec * 1000000 + stop.tv_usec + - start.tv_sec * 1000000 - start.tv_usec) / (size * iter); + + printf("%0.2f microseconds for list length %d\n", usec, size); + + N(SLDestroy)(list); + + return usec; +} + +static void print_neighbors(void *list, unsigned long key) +{ + unsigned long prev_key = 0; + unsigned long next_key = 0; + void *prev_value; + void *next_value; + int retval; + + retval = drmSLLookupNeighbors(list, key, + &prev_key, &prev_value, + &next_key, &next_value); + printf("Neighbors of %5lu: %d %5lu %5lu\n", + key, retval, prev_key, next_key); +} + +int main(void) +{ + SkipListPtr list; + double usec, usec2, usec3, usec4; + + list = N(SLCreate)(); + printf( "list at %p\n", list); + + print(list); + printf("\n==============================\n\n"); + + N(SLInsert)(list, 123, NULL); + N(SLInsert)(list, 213, NULL); + N(SLInsert)(list, 50, NULL); + print(list); + printf("\n==============================\n\n"); + + print_neighbors(list, 0); + print_neighbors(list, 50); + print_neighbors(list, 51); + print_neighbors(list, 123); + print_neighbors(list, 200); + print_neighbors(list, 213); + print_neighbors(list, 256); + printf("\n==============================\n\n"); + + N(SLDelete)(list, 50); + print(list); + printf("\n==============================\n\n"); + + N(SLDump)(list); + N(SLDestroy)(list); + printf("\n==============================\n\n"); + + usec = do_time(100, 10000); + usec2 = do_time(1000, 500); + printf("Table size increased by %0.2f, search time increased by %0.2f\n", + 1000.0/100.0, usec2 / usec); + + usec3 = do_time(10000, 50); + printf("Table size increased by %0.2f, search time increased by %0.2f\n", + 10000.0/100.0, usec3 / usec); + + usec4 = do_time(100000, 4); + printf("Table size increased by %0.2f, search time increased by %0.2f\n", + 100000.0/100.0, usec4 / usec); + + return 0; +} +#endif -- cgit v1.2.3