/*
*
* Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND., USA.
* Copyright (c) 2009, Intel Corporation.
* 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
* THE COPYRIGHT HOLDERS, AUTHORS 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.
*
*
*/
/*
* Generic simple memory manager implementation. Intended to be used as a base
* class implementation for more advanced memory managers.
*
* Note that the algorithm used is quite simple and there might be substantial
* performance gains if a smarter free list is implemented.
* Currently it is just an
* unordered stack of free regions. This could easily be improved if an RB-tree
* is used instead. At least if we expect heavy fragmentation.
*
* Aligned allocations can also see improvement.
*
* Authors:
* Thomas Hellström <thomas-at-tungstengraphics-dot-com>
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include "drmP.h"
unsigned long
drm_mm_tail_space(struct drm_mm *mm)
{
struct list_head *tail_node;
struct drm_mm_node *entry;
tail_node = mm->ml_entry.prev;
entry = list_entry(tail_node, struct drm_mm_node, ml_entry);
if (!entry->free)
return (0);
return (entry->size);
}
int
drm_mm_remove_space_from_tail(struct drm_mm *mm, unsigned long size)
{
struct list_head *tail_node;
struct drm_mm_node *entry;
tail_node = mm->ml_entry.prev;
entry = list_entry(tail_node, struct drm_mm_node, ml_entry);
if (!entry->free)
return (ENOMEM);
if (entry->size <= size)
return (ENOMEM);
entry->size -= size;
return (0);
}
static int
drm_mm_create_tail_node(struct drm_mm *mm,
unsigned long start,
unsigned long size)
{
struct drm_mm_node *child;
child = (struct drm_mm_node *)
drm_alloc(sizeof (*child), DRM_MEM_MM);
if (!child)
return (ENOMEM);
child->free = 1;
child->size = size;
child->start = start;
child->mm = mm;
list_add_tail(&child->ml_entry, &mm->ml_entry, (caddr_t)child);
list_add_tail(&child->fl_entry, &mm->fl_entry, (caddr_t)child);
return (0);
}
int
drm_mm_add_space_to_tail(struct drm_mm *mm, unsigned long size)
{
struct list_head *tail_node;
struct drm_mm_node *entry;
tail_node = mm->ml_entry.prev;
entry = list_entry(tail_node, struct drm_mm_node, ml_entry);
if (!entry->free) {
return (drm_mm_create_tail_node(mm,
entry->start + entry->size, size));
}
entry->size += size;
return (0);
}
static struct drm_mm_node *
drm_mm_split_at_start(struct drm_mm_node *parent,
unsigned long size)
{
struct drm_mm_node *child;
child = (struct drm_mm_node *)
drm_alloc(sizeof (*child), DRM_MEM_MM);
if (!child)
return (NULL);
INIT_LIST_HEAD(&child->fl_entry);
child->free = 0;
child->size = size;
child->start = parent->start;
child->mm = parent->mm;
list_add_tail(&child->ml_entry, &parent->ml_entry, (caddr_t)child);
INIT_LIST_HEAD(&child->fl_entry);
parent->size -= size;
parent->start += size;
return (child);
}
/*
* Put a block. Merge with the previous and / or next block if they are free.
* Otherwise add to the free stack.
*/
void
drm_mm_put_block(struct drm_mm_node *cur)
{
struct drm_mm *mm = cur->mm;
struct list_head *cur_head = &cur->ml_entry;
struct list_head *root_head = &mm->ml_entry;
struct drm_mm_node *prev_node = NULL;
struct drm_mm_node *next_node;
int merged = 0;
if (cur_head->prev != root_head) {
prev_node = list_entry(cur_head->prev,
struct drm_mm_node, ml_entry);
if (prev_node->free) {
prev_node->size += cur->size;
merged = 1;
}
}
if (cur_head->next != root_head) {
next_node = list_entry(cur_head->next,
struct drm_mm_node, ml_entry);
if (next_node->free) {
if (merged) {
prev_node->size += next_node->size;
list_del(&next_node->ml_entry);
list_del(&next_node->fl_entry);
drm_free(next_node,
sizeof (*next_node), DRM_MEM_MM);
} else {
next_node->size += cur->size;
next_node->start = cur->start;
merged = 1;
}
}
}
if (!merged) {
cur->free = 1;
list_add(&cur->fl_entry, &mm->fl_entry, (caddr_t)cur);
} else {
list_del(&cur->ml_entry);
drm_free(cur, sizeof (*cur), DRM_MEM_MM);
}
}
struct drm_mm_node *
drm_mm_get_block(struct drm_mm_node *parent,
unsigned long size,
unsigned alignment)
{
struct drm_mm_node *align_splitoff = NULL;
struct drm_mm_node *child;
unsigned tmp = 0;
if (alignment)
tmp = parent->start % alignment;
if (tmp) {
align_splitoff = drm_mm_split_at_start(parent, alignment - tmp);
if (!align_splitoff)
return (NULL);
}
if (parent->size == size) {
list_del_init(&parent->fl_entry);
parent->free = 0;
return (parent);
} else {
child = drm_mm_split_at_start(parent, size);
}
if (align_splitoff)
drm_mm_put_block(align_splitoff);
return (child);
}
struct drm_mm_node *
drm_mm_search_free(const struct drm_mm *mm,
unsigned long size,
unsigned alignment,
int best_match)
{
struct list_head *list;
const struct list_head *free_stack = &mm->fl_entry;
struct drm_mm_node *entry;
struct drm_mm_node *best;
unsigned long best_size;
unsigned wasted;
best = NULL;
best_size = ~0UL;
list_for_each(list, free_stack) {
entry = list_entry(list, struct drm_mm_node, fl_entry);
wasted = 0;
if (entry->size < size)
continue;
if (alignment) {
register unsigned tmp = entry->start % alignment;
if (tmp)
wasted += alignment - tmp;
}
if (entry->size >= size + wasted) {
if (!best_match)
return (entry);
if (size < best_size) {
best = entry;
best_size = entry->size;
}
}
}
return (best);
}
int
drm_mm_clean(struct drm_mm *mm)
{
struct list_head *head = &mm->ml_entry;
return (head->next->next == head);
}
int
drm_mm_init(struct drm_mm *mm, unsigned long start, unsigned long size)
{
INIT_LIST_HEAD(&mm->ml_entry);
INIT_LIST_HEAD(&mm->fl_entry);
return (drm_mm_create_tail_node(mm, start, size));
}
void
drm_mm_takedown(struct drm_mm *mm)
{
struct list_head *bnode = mm->fl_entry.next;
struct drm_mm_node *entry;
entry = list_entry(bnode, struct drm_mm_node, fl_entry);
if (entry->ml_entry.next != &mm->ml_entry ||
entry->fl_entry.next != &mm->fl_entry) {
DRM_ERROR("Memory manager not clean. Delaying takedown\n");
return;
}
list_del(&entry->fl_entry);
list_del(&entry->ml_entry);
drm_free(entry, sizeof (*entry), DRM_MEM_MM);
}
void
drm_mm_clean_ml(const struct drm_mm *mm)
{
const struct list_head *mlstack = &mm->ml_entry;
struct list_head *list, *temp;
struct drm_mm_node *entry;
if (mlstack->next == NULL)
return;
list_for_each_safe(list, temp, mlstack) {
entry = list_entry(list, struct drm_mm_node, ml_entry);
DRM_DEBUG("ml_entry 0x%x, size 0x%x, start 0x%x",
entry, entry->size, entry->start);
list_del(&entry->fl_entry);
list_del(&entry->ml_entry);
drm_free(entry, sizeof (*entry), DRM_MEM_MM);
}
}