drivers/char/drm/sis_ds.c - linux/kernel/git/mellanox/linux - Git at Google

 /* sis_ds.c -- Private header for Direct Rendering Manager -*- linux-c -*-
  * Created: Mon Jan  4 10:05:05 1999 by sclin@sis.com.tw
  *
  * Copyright 2000 Silicon Integrated Systems Corp, Inc., HsinChu, Taiwan.
  * 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:
  *    Sung-Ching Lin <sclin@sis.com.tw>
  *
  */

 #include "drmP.h"
 #include "drm.h"
 #include "sis_ds.h"

 /* Set Data Structure, not check repeated value
  * temporarily used
  */

 set_t *setInit(void)
 {
 	int i;
 	set_t *set;

 	set = (set_t *) drm_alloc(sizeof(set_t), DRM_MEM_DRIVER);
 	if (set != NULL) {
 		for (i = 0; i < SET_SIZE; i++) {
 			set->list[i].free_next = i + 1;
 			set->list[i].alloc_next = -1;
 		}
 		set->list[SET_SIZE - 1].free_next = -1;
 		set->free = 0;
 		set->alloc = -1;
 		set->trace = -1;
 	}
 	return set;
 }

 int setAdd(set_t * set, ITEM_TYPE item)
 {
 	int free = set->free;

 	if (free != -1) {
 		set->list[free].val = item;
 		set->free = set->list[free].free_next;
 	} else {
 		return 0;
 	}

 	set->list[free].alloc_next = set->alloc;
 	set->alloc = free;
 	set->list[free].free_next = -1;

 	return 1;
 }

 int setDel(set_t * set, ITEM_TYPE item)
 {
 	int alloc = set->alloc;
 	int prev = -1;

 	while (alloc != -1) {
 		if (set->list[alloc].val == item) {
 			if (prev != -1)
 				set->list[prev].alloc_next =
 				    set->list[alloc].alloc_next;
 			else
 				set->alloc = set->list[alloc].alloc_next;
 			break;
 		}
 		prev = alloc;
 		alloc = set->list[alloc].alloc_next;
 	}

 	if (alloc == -1)
 		return 0;

 	set->list[alloc].free_next = set->free;
 	set->free = alloc;
 	set->list[alloc].alloc_next = -1;

 	return 1;
 }

 /* setFirst -> setAdd -> setNext is wrong */

 int setFirst(set_t * set, ITEM_TYPE * item)
 {
 	if (set->alloc == -1)
 		return 0;

 	*item = set->list[set->alloc].val;
 	set->trace = set->list[set->alloc].alloc_next;

 	return 1;
 }

 int setNext(set_t * set, ITEM_TYPE * item)
 {
 	if (set->trace == -1)
 		return 0;

 	*item = set->list[set->trace].val;
 	set->trace = set->list[set->trace].alloc_next;

 	return 1;
 }

 int setDestroy(set_t * set)
 {
 	drm_free(set, sizeof(set_t), DRM_MEM_DRIVER);

 	return 1;
 }

 /*
  * GLX Hardware Device Driver common code
  * Copyright (C) 1999 Wittawat Yamwong
  *
  * 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 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
  * WITTAWAT YAMWONG, OR ANY OTHER CONTRIBUTORS 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.
  *
  */

 #define ISFREE(bptr) ((bptr)->free)

 memHeap_t *mmInit(int ofs, int size)
 {
 	PMemBlock blocks;

 	if (size <= 0)
 		return NULL;

 	blocks = (TMemBlock *) drm_calloc(1, sizeof(TMemBlock), DRM_MEM_DRIVER);
 	if (blocks != NULL) {
 		blocks->ofs = ofs;
 		blocks->size = size;
 		blocks->free = 1;
 		return (memHeap_t *) blocks;
 	} else
 		return NULL;
 }

 /* Checks if a pointer 'b' is part of the heap 'heap' */
 int mmBlockInHeap(memHeap_t * heap, PMemBlock b)
 {
 	TMemBlock *p;

 	if (heap == NULL || b == NULL)
 		return 0;

 	p = heap;
 	while (p != NULL && p != b) {
 		p = p->next;
 	}
 	if (p == b)
 		return 1;
 	else
 		return 0;
 }

 static TMemBlock *SliceBlock(TMemBlock * p,
 			     int startofs, int size,
 			     int reserved, int alignment)
 {
 	TMemBlock *newblock;

 	/* break left */
 	if (startofs > p->ofs) {
 		newblock = (TMemBlock *) drm_calloc(1, sizeof(TMemBlock),
 						    DRM_MEM_DRIVER);
 		newblock->ofs = startofs;
 		newblock->size = p->size - (startofs - p->ofs);
 		newblock->free = 1;
 		newblock->next = p->next;
 		p->size -= newblock->size;
 		p->next = newblock;
 		p = newblock;
 	}

 	/* break right */
 	if (size < p->size) {
 		newblock = (TMemBlock *) drm_calloc(1, sizeof(TMemBlock),
 						    DRM_MEM_DRIVER);
 		newblock->ofs = startofs + size;
 		newblock->size = p->size - size;
 		newblock->free = 1;
 		newblock->next = p->next;
 		p->size = size;
 		p->next = newblock;
 	}

 	/* p = middle block */
 	p->align = alignment;
 	p->free = 0;
 	p->reserved = reserved;
 	return p;
 }

 PMemBlock mmAllocMem(memHeap_t * heap, int size, int align2, int startSearch)
 {
 	int mask, startofs, endofs;
 	TMemBlock *p;

 	if (heap == NULL || align2 < 0 || size <= 0)
 		return NULL;

 	mask = (1 << align2) - 1;
 	startofs = 0;
 	p = (TMemBlock *) heap;
 	while (p != NULL) {
 		if (ISFREE(p)) {
 			startofs = (p->ofs + mask) & ~mask;
 			if (startofs < startSearch) {
 				startofs = startSearch;
 			}
 			endofs = startofs + size;
 			if (endofs <= (p->ofs + p->size))
 				break;
 		}
 		p = p->next;
 	}
 	if (p == NULL)
 		return NULL;
 	p = SliceBlock(p, startofs, size, 0, mask + 1);
 	p->heap = heap;
 	return p;
 }

 static __inline__ int Join2Blocks(TMemBlock * p)
 {
 	if (p->free && p->next && p->next->free) {
 		TMemBlock *q = p->next;
 		p->size += q->size;
 		p->next = q->next;
 		drm_free(q, sizeof(TMemBlock), DRM_MEM_DRIVER);
 		return 1;
 	}
 	return 0;
 }

 int mmFreeMem(PMemBlock b)
 {
 	TMemBlock *p, *prev;

 	if (b == NULL)
 		return 0;
 	if (b->heap == NULL)
 		return -1;

 	p = b->heap;
 	prev = NULL;
 	while (p != NULL && p != b) {
 		prev = p;
 		p = p->next;
 	}
 	if (p == NULL || p->free || p->reserved)
 		return -1;

 	p->free = 1;
 	Join2Blocks(p);
 	if (prev)
 		Join2Blocks(prev);
 	return 0;
 }
	/* sis_ds.c -- Private header for Direct Rendering Manager -- linux-c --
	* Created: Mon Jan 4 10:05:05 1999 by sclin@sis.com.tw
	*
	* Copyright 2000 Silicon Integrated Systems Corp, Inc., HsinChu, Taiwan.
	* 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:
	* Sung-Ching Lin <sclin@sis.com.tw>
	*
	*/

	#include "drmP.h"
	#include "drm.h"
	#include "sis_ds.h"

	/* Set Data Structure, not check repeated value
	* temporarily used
	*/

	set_t *setInit(void)
	{
	int i;
	set_t *set;

	set = (set_t *) drm_alloc(sizeof(set_t), DRM_MEM_DRIVER);
	if (set != NULL) {
	for (i = 0; i < SET_SIZE; i++) {
	set->list[i].free_next = i + 1;
	set->list[i].alloc_next = -1;
	}
	set->list[SET_SIZE - 1].free_next = -1;
	set->free = 0;
	set->alloc = -1;
	set->trace = -1;
	}
	return set;
	}

	int setAdd(set_t * set, ITEM_TYPE item)
	{
	int free = set->free;

	if (free != -1) {
	set->list[free].val = item;
	set->free = set->list[free].free_next;
	} else {
	return 0;
	}

	set->list[free].alloc_next = set->alloc;
	set->alloc = free;
	set->list[free].free_next = -1;

	return 1;
	}

	int setDel(set_t * set, ITEM_TYPE item)
	{
	int alloc = set->alloc;
	int prev = -1;

	while (alloc != -1) {
	if (set->list[alloc].val == item) {
	if (prev != -1)
	set->list[prev].alloc_next =
	set->list[alloc].alloc_next;
	else
	set->alloc = set->list[alloc].alloc_next;
	break;
	}
	prev = alloc;
	alloc = set->list[alloc].alloc_next;
	}

	if (alloc == -1)
	return 0;

	set->list[alloc].free_next = set->free;
	set->free = alloc;
	set->list[alloc].alloc_next = -1;

	return 1;
	}

	/* setFirst -> setAdd -> setNext is wrong */

	int setFirst(set_t * set, ITEM_TYPE * item)
	{
	if (set->alloc == -1)
	return 0;

	*item = set->list[set->alloc].val;
	set->trace = set->list[set->alloc].alloc_next;

	return 1;
	}

	int setNext(set_t * set, ITEM_TYPE * item)
	{
	if (set->trace == -1)
	return 0;

	*item = set->list[set->trace].val;
	set->trace = set->list[set->trace].alloc_next;

	return 1;
	}

	int setDestroy(set_t * set)
	{
	drm_free(set, sizeof(set_t), DRM_MEM_DRIVER);

	return 1;
	}

	/*
	* GLX Hardware Device Driver common code
	* Copyright (C) 1999 Wittawat Yamwong
	*
	* 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 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
	* WITTAWAT YAMWONG, OR ANY OTHER CONTRIBUTORS 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.
	*
	*/

	#define ISFREE(bptr) ((bptr)->free)

	memHeap_t *mmInit(int ofs, int size)
	{
	PMemBlock blocks;

	if (size <= 0)
	return NULL;

	blocks = (TMemBlock *) drm_calloc(1, sizeof(TMemBlock), DRM_MEM_DRIVER);
	if (blocks != NULL) {
	blocks->ofs = ofs;
	blocks->size = size;
	blocks->free = 1;
	return (memHeap_t *) blocks;
	} else
	return NULL;
	}

	/* Checks if a pointer 'b' is part of the heap 'heap' */
	int mmBlockInHeap(memHeap_t * heap, PMemBlock b)
	{
	TMemBlock *p;

	if (heap == NULL \|\| b == NULL)
	return 0;

	p = heap;
	while (p != NULL && p != b) {
	p = p->next;
	}
	if (p == b)
	return 1;
	else
	return 0;
	}

	static TMemBlock SliceBlock(TMemBlock p,
	int startofs, int size,
	int reserved, int alignment)
	{
	TMemBlock *newblock;

	/* break left */
	if (startofs > p->ofs) {
	newblock = (TMemBlock *) drm_calloc(1, sizeof(TMemBlock),
	DRM_MEM_DRIVER);
	newblock->ofs = startofs;
	newblock->size = p->size - (startofs - p->ofs);
	newblock->free = 1;
	newblock->next = p->next;
	p->size -= newblock->size;
	p->next = newblock;
	p = newblock;
	}

	/* break right */
	if (size < p->size) {
	newblock = (TMemBlock *) drm_calloc(1, sizeof(TMemBlock),
	DRM_MEM_DRIVER);
	newblock->ofs = startofs + size;
	newblock->size = p->size - size;
	newblock->free = 1;
	newblock->next = p->next;
	p->size = size;
	p->next = newblock;
	}

	/* p = middle block */
	p->align = alignment;
	p->free = 0;
	p->reserved = reserved;
	return p;
	}

	PMemBlock mmAllocMem(memHeap_t * heap, int size, int align2, int startSearch)
	{
	int mask, startofs, endofs;
	TMemBlock *p;

	if (heap == NULL \|\| align2 < 0 \|\| size <= 0)
	return NULL;

	mask = (1 << align2) - 1;
	startofs = 0;
	p = (TMemBlock *) heap;
	while (p != NULL) {
	if (ISFREE(p)) {
	startofs = (p->ofs + mask) & ~mask;
	if (startofs < startSearch) {
	startofs = startSearch;
	}
	endofs = startofs + size;
	if (endofs <= (p->ofs + p->size))
	break;
	}
	p = p->next;
	}
	if (p == NULL)
	return NULL;
	p = SliceBlock(p, startofs, size, 0, mask + 1);
	p->heap = heap;
	return p;
	}

	static __inline__ int Join2Blocks(TMemBlock * p)
	{
	if (p->free && p->next && p->next->free) {
	TMemBlock *q = p->next;
	p->size += q->size;
	p->next = q->next;
	drm_free(q, sizeof(TMemBlock), DRM_MEM_DRIVER);
	return 1;
	}
	return 0;
	}

	int mmFreeMem(PMemBlock b)
	{
	TMemBlock p, prev;

	if (b == NULL)
	return 0;
	if (b->heap == NULL)
	return -1;

	p = b->heap;
	prev = NULL;
	while (p != NULL && p != b) {
	prev = p;
	p = p->next;
	}
	if (p == NULL \|\| p->free \|\| p->reserved)
	return -1;

	p->free = 1;
	Join2Blocks(p);
	if (prev)
	Join2Blocks(prev);
	return 0;
	}