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/* radeon_mem.c -- Simple GART/fb memory manager for radeon -*- linux-c -*- */

/*

 * Copyright (C) The Weather Channel, Inc.  2002.  All Rights Reserved.

 *

 * The Weather Channel (TM) funded Tungsten Graphics to develop the

 * initial release of the Radeon 8500 driver under the XFree86 license.

 * This notice must be preserved.

 *

 * 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:

 *    Keith Whitwell 

 */

#define USED_BLOCK  1

#define list_for_each(entry, head)        \

   for (entry = (head)->next; entry != head; entry = (entry)->next)

/* Very simple allocator for GART memory, working on a static range

 * already mapped into each client's address space.

 */

struct mem_block

{

  struct mem_block *next;

  struct mem_block *prev;

  u32_t             start;

  size_t            size;

};

/* Initialize.  How to check for an uninitialized heap?

 */

static int init_heap(struct mem_block **heap, int start, int size)

{

    struct mem_block *blocks = malloc(sizeof(*blocks));

    if (!blocks)

        return -1; //-ENOMEM;

    *heap = malloc(sizeof(**heap));

    if (!*heap)

    {

        free(blocks);

        return -1; //-ENOMEM;

	}

    blocks->start = start;

    blocks->size  = size;

    blocks->next  = blocks->prev = *heap;

    __clear(*heap,sizeof(**heap));

	(*heap)->next = (*heap)->prev = blocks;

    (*heap)->start |= USED_BLOCK;

	return 0;

}

static struct mem_block **get_heap(RHDPtr rhdPtr, int region)

{

    switch (region)

    {

        case RHD_MEM_GART:

            return &rhdPtr->gart_heap;

        case RHD_MEM_FB:

            return &rhdPtr->fb_heap;

        default:

        return NULL;

	}

}

static struct mem_block *split_block(struct mem_block *p, int size)

{

	/* Maybe cut off the end of an existing block */

    if (size < p->size)

    {

        struct mem_block *newblock = malloc(sizeof(*newblock));

        if (!newblock)

            goto out;

        newblock->start = p->start + size;

        newblock->size = p->size - size;

        newblock->next = p->next;

        newblock->prev = p;

        p->next->prev = newblock;

        p->next = newblock;

        p->size = size;

        p->start|=USED_BLOCK;

    }

out:

    return p;

}

static struct mem_block *alloc_block(struct mem_block *heap, int size)

{

	struct mem_block *p;

    list_for_each(p, heap)

    {

        if ( !(p->start & USED_BLOCK) && size <= p->size)

            return split_block(p, size);

	}

	return NULL;

}

static struct mem_block *find_block(struct mem_block *heap, int start)

{

	struct mem_block *p;

	list_for_each(p, heap)

    if ((p->start & ~USED_BLOCK) == start)

			return p;

	return NULL;

}

static void free_block(struct mem_block *p)

{

	/* Assumes a single contiguous range.  Needs a special file_priv in

	 * 'heap' to stop it being subsumed.

	 */

    p->start &= ~USED_BLOCK;

    if ( !(p->next->start & USED_BLOCK))

    {

		struct mem_block *q = p->next;

		p->size += q->size;

		p->next = q->next;

		p->next->prev = p;

        free(q);

	}

    if ( !(p->prev->start & USED_BLOCK))

    {

		struct mem_block *q = p->prev;

		q->size += p->size;

		q->next = p->next;

		q->next->prev = q;

        free(p);

	}

}

int rhdInitHeap(RHDPtr rhdPtr)

{

    int base = rhdPtr->FbFreeStart;

    return init_heap(&rhdPtr->fb_heap, base, rhdPtr->FbFreeSize);

};

void *rhd_mem_alloc(RHDPtr rhdPtr,int region, int size)

{

	struct mem_block *block, **heap;

    heap = get_heap(rhdPtr, region);

    if (!heap || !*heap)

        return NULL;

	/* Make things easier on ourselves: all allocations at least

	 * 4k aligned.

	 */

    size = (size+4095) & ~4095;

    block = alloc_block(*heap, size);

	if (!block)

        return NULL;

    return (void*)(block->start & ~USED_BLOCK);

}

int rhd_mem_free(RHDPtr rhdPtr, int region, void *offset)

{

	struct mem_block *block, **heap;

    heap = get_heap(rhdPtr, region);

    if (!heap || !*heap)

        return -1;

    block = find_block(*heap, (int)offset);

	if (!block)

        return -1;

    if ( !(block->start & USED_BLOCK))

        return -1;

	free_block(block);

	return 0;

}

void dump_mem()

{

	struct mem_block *p;

    struct mem_block **heap;

    heap = &rhd.fb_heap;

    list_for_each(p, *heap)

    {

        dbgprintf("block: %x  next: %x  prev: %x  start: %x  size:%x\n",

              p,p->next,p->prev,p->start,p->size);

	}

}