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path: root/linux-core/drm_drawable.c
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2007-07-20Replace DRM_IOCTL_ARGS with (dev, data, file_priv) and remove DRM_DEVICE.Eric Anholt
The data is now in kernel space, copied in/out as appropriate according to the This results in DRM_COPY_{TO,FROM}_USER going away, and error paths to deal with those failures. This also means that XFree86 4.2.0 support for i810 DRM is lost.
2007-07-20Remove DRM_ERR OS macro.Eric Anholt
This was used to make all ioctl handlers return -errno on linux and errno on *BSD. Instead, just return -errno in shared code, and flip sign on return from shared code to *BSD code.
2007-07-16drm: remove drmP.h internal typedefsDave Airlie
2007-07-16drm: detypedef drm.h and fixup all problemsDave Airlie
2007-07-03Use idr_replace trick to eliminate struct drm_ctx_sarea_list.Kristian Høgsberg
2007-07-03Simplification for previous commit.Michel Dänzer
Dave Airlie pointed out on IRC that idr_replace lets us know if the ID hasn't been allocated, so we don't need a special pointer value for allocated IDs that don't have valid information yet.
2007-07-03Restore pre-idr semantics for drawable information.Michel Dänzer
There's a difference between a drawable ID not having valid drawable information and not being allocated at all. Not making the distinction would break i915 DRM swap scheduling with older X servers that don't push drawable cliprect information to the DRM.
2007-07-02Drop drm_drawable_list and add drm_drawable_info directly to the idr.Kristian Høgsberg
2007-06-10use krh's idr mods to remove lists from idr codeDave Airlie
2007-05-27drm: convert drawable handling to use Linux idrDave Airlie
This cleans this code up a lot and uses the generic Linux idr which is designed for this. Signed-off-by: Dave Airlie <airlied@linux.ie>
2007-05-26drm: make sure the drawable code doesn't call malloc(0).Michel Dänzer
Signed-off-by: Michel Dänzer <michel@tungstengraphics.com> Signed-off-by: Dave Airlie <airlied@linux.ie>
2006-12-01Unshare drm_drawable.c again for now.Michel Dänzer
The current version didn't build on BSD, where the new functionality isn't used yet anyway. Whoever changes that will hopefully be able to make the OSes share this file as well.
2006-12-01Track linux-core symlinks in git.Michel Dänzer
2006-10-18Remove stray softlink.Thomas Hellstrom
2006-09-28Add support for tracking drawable information to coreMichel Dänzer
Actually make the existing ioctls for adding and removing drawables do something useful, and add another ioctl for the X server to update drawable information. The only kind of drawable information tracked so far is cliprects.
2004-10-18Update Doxygen configuration & comments.Jose Fonseca
2004-09-30Lindent of core build. Drivers checked for no binary diffs. A few filesJon Smirl
weren't Lindent's because their comments didn't convert very well. A bunch of other minor clean up with no code implact included.
2004-09-27First check in for DRM that splits core from personality modulesJon Smirl
2004-08-27__NO_VERSION__ hasn't been needed since 2.3 days ditch it...Dave Airlie
2004-07-20first set of __user annotations from kernel (Al Viro)Dave Airlie
2003-05-27Merged DRM documentation.Jose Fonseca
2001-02-15Merge mga-1-0-0-branch into trunk.Gareth Hughes
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/* xf86drmSL.c -- Skip list support
 * Created: Mon May 10 09:28:13 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.
 * 
 * Authors: Rickard E. (Rik) Faith <faith@valinux.com>
 *
 * $XFree86: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/xf86drmSL.c,v 1.3 2000/06/17 00:03:34 martin 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.
 *
 */

#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#endif

#define SL_MAIN 0

#if SL_MAIN
# include <stdio.h>
# include <stdlib.h>
#  include <sys/time.h>
#else
# include "drm.h"
# include "xf86drm.h"
# ifdef XFree86LOADER
#  include "xf86.h"
#  include "xf86_ansic.h"
# else
#  include <stdio.h>
#  include <stdlib.h>
# endif
#endif

#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 *drmSLCreate(void);
extern int  drmSLDestroy(void *l);
extern int  drmSLLookup(void *l, unsigned long key, void **value);
extern int  drmSLInsert(void *l, unsigned long key, void *value);
extern int  drmSLDelete(void *l, unsigned long key);
extern int  drmSLNext(void *l, unsigned long *key, void **value);
extern int  drmSLFirst(void *l, unsigned long *key, void **value);
extern void drmSLDump(void *l);
extern int  drmSLLookupNeighbors(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 *drmSLCreate(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 drmSLDestroy(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 drmSLInsert(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 drmSLDelete(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 drmSLLookup(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 drmSLLookupNeighbors(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 drmSLNext(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 drmSLFirst(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 drmSLNext(list, key, value);
}

/* Dump internal data structures for debugging. */
void drmSLDump(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 (drmSLFirst(list, &key, &value)) {
	do {
	    printf("key = %5lu, value = %p\n", key, value);
	} while (drmSLNext(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 = drmSLCreate();

    for (i = 0; i < size; i++) {
	keys[i] = SL_RANDOM;
	drmSLInsert(list, keys[i], NULL);
    }

    previous = 0;
    if (drmSLFirst(list, &key, &value)) {
	do {
	    if (key <= previous) {
		printf( "%lu !< %lu\n", previous, key);
	    }
	    previous = key;
	} while (drmSLNext(list, &key, &value));
    }
    
    gettimeofday(&start, NULL);
    for (j = 0; j < iter; j++) {
	for (i = 0; i < size; i++) {
	    if (drmSLLookup(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);

    drmSLDestroy(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 = drmSLCreate();
    printf( "list at %p\n", list);

    print(list);
    printf("\n==============================\n\n");

    drmSLInsert(list, 123, NULL);
    drmSLInsert(list, 213, NULL);
    drmSLInsert(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");    
    
    drmSLDelete(list, 50);
    print(list);
    printf("\n==============================\n\n");

    drmSLDump(list);
    drmSLDestroy(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
generated by cgit v1.2.3 (git 2.25.1) at 2025-12-13 01:44:24 +0000