drivers/char/drm/via_ds.c

/*
 * Copyright 1998-2003 VIA Technologies, Inc. All Rights Reserved.
 * Copyright 2001-2003 S3 Graphics, Inc. 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, sub license,
 * 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 NON-INFRINGEMENT. IN NO EVENT SHALL
 * VIA, S3 GRAPHICS, 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.
 *
 * Fixes:
 *	Changed to use via_ prefixes on globals
 *	Fixed malloc failure paths
 *	Reformatted to Linux style
 *	Removed ITEM_TYPE typedef, FREE/MALLOC and other macro bits
 */

#define __NO_VERSION__
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <asm/io.h>
#include <linux/pci.h>

#include "via_ds.h"

#warning "Fix variable/global names to use via_"

extern unsigned int VIA_DEBUG;

set_t *via_set_init(void)
{
	int i;
	set_t *set;
	set = (set_t *)kmalloc(sizeof(set_t), GFP_KERNEL);
	if(set == NULL)
		return 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 via_set_add(set_t * set, unsigned int 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 via_set_del(set_t * set, unsigned int 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 via_set_first(set_t * set, unsigned int * item)
{
	if (set->alloc == -1)
		return 0;

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


	return 1;
}

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

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

	return 1;
}

int via_set_destroy(set_t * set)
{
	kfree(set);
	return 1;
}

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

#define PRINTF(fmt, arg...) do{}while(0)

void via_mmDumpMemInfo(memHeap_t * heap)
{
	TMemBlock *p;

	PRINTF("Memory heap %p:\n", heap);

	if (heap == 0)
		PRINTF("  heap == 0\n");
	else {
		p = (TMemBlock *) heap;

		while (p) {
			PRINTF("  Offset:%08x, Size:%08x, %c%c\n", p->ofs, p->size, p->free ? '.' : 'U', p->reserved ? 'R' : '.');
			p = p->next;
		}
	}

	PRINTF("End of memory blocks\n");
}

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

	if (size <= 0)
		return 0;


	blocks = (TMemBlock *) kmalloc(sizeof(TMemBlock), GFP_KERNEL);

	if (blocks) {
		memset(blocks, 0, sizeof(TMemBlock));
		blocks->ofs = ofs;
		blocks->size = size;
		blocks->free = 1;
		return (memHeap_t *) blocks;
	} else
		return NULL;
}

memHeap_t *via_mmAddRange(memHeap_t * heap, int ofs, int size)
{
	PMemBlock blocks;
	blocks = (TMemBlock *) kmalloc(2 *  sizeof(TMemBlock), GFP_KERNEL);

	if (blocks) {
		memset(blocks, 0, 2 * sizeof(TMemBlock));
		blocks[0].size = size;
		blocks[0].free = 1;
		blocks[0].ofs = ofs;
		blocks[0].next = &blocks[1];

		/* Discontinuity - stops JoinBlock from trying to join non-adjacent
		 * ranges.
		 */
		blocks[1].size = 0;
		blocks[1].free = 0;
		blocks[1].ofs = ofs + size;
		blocks[1].next = (PMemBlock) heap;
		return (memHeap_t *) blocks;
	} else
		return heap;
}

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

	/* break left */
	if (startofs > p->ofs) {
		newblock = (TMemBlock *) kmalloc(sizeof(TMemBlock), GFP_KERNEL);
		if(newblock == NULL)
			return NULL;
		memset(newblock, 0, sizeof(TMemBlock));
		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 *) kmalloc(sizeof(TMemBlock), GFP_KERNEL);
		if(newblock == NULL)
			return NULL;
		memset(newblock, 0, sizeof(TMemBlock));
		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 via_mmAllocMem(memHeap_t * heap, int size, int align2, int startSearch)
{
	int mask, startofs, endofs;
	TMemBlock *p;

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

	mask = (1 << align2) - 1;
	startofs = 0;
	p = (TMemBlock *) heap;

	while (p) {
		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)
		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;
		kfree(q);

		return 1;
	}

	return 0;
}

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

	if (!b)
		return 0;

	if (!b->heap) {
		return -1;
	}

	p = b->heap;
	prev = NULL;

	while (p && p != b) {
		prev = p;
		p = p->next;
	}

	if (!p || p->free || p->reserved) {
		if (!p)
			BUG();
		else if (p->free)
			BUG();
		else
			BUG();
		return -1;
	}

	p->free = 1;
	Join2Blocks(p);

	if (prev)
		Join2Blocks(prev);

	return 0;
}

int via_mm_ReserveMem(memHeap_t * heap, int offset, int size)
{
	int endofs;
	TMemBlock *p;

	if (!heap || size <= 0)
		return -1;
	endofs = offset + size;
	p = (TMemBlock *) heap;

	while (p && p->ofs <= offset) {
		if (ISFREE(p) && endofs <= (p->ofs + p->size)) {
			SliceBlock(p, offset, size, 1, 1);
			return 0;
		}
		p = p->next;
	}
	return -1;
}

int via_mm_FreeReserved(memHeap_t * heap, int offset)
{
	TMemBlock *p, *prev;

	if (!heap)
		return -1;

	p = (TMemBlock *) heap;
	prev = NULL;

	while (p && p->ofs != offset) {
		prev = p;
		p = p->next;
	}

	if (!p || !p->reserved)
		return -1;
	p->free = 1;
	p->reserved = 0;
	Join2Blocks(p);

	if (prev)
		Join2Blocks(prev);

	return 0;
}

void via_mm_Destroy(memHeap_t * heap)
{
	TMemBlock *p, *q;

	if (!heap)
		return;
	p = (TMemBlock *) heap;

	while (p) {
		q = p->next;
		kfree(p);
		p = q;
	}
}