![Thomas Hellstrom](/assets/img/avatar_default.png)
When searching for free space in a range, the function could return a node extending outside of the given range. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
512 lines
12 KiB
C
512 lines
12 KiB
C
/**************************************************************************
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*
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* Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND., USA.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*
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**************************************************************************/
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/*
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* Generic simple memory manager implementation. Intended to be used as a base
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* class implementation for more advanced memory managers.
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*
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* Note that the algorithm used is quite simple and there might be substantial
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* performance gains if a smarter free list is implemented. Currently it is just an
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* unordered stack of free regions. This could easily be improved if an RB-tree
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* is used instead. At least if we expect heavy fragmentation.
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*
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* Aligned allocations can also see improvement.
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*
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* Authors:
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* Thomas Hellström <thomas-at-tungstengraphics-dot-com>
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*/
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#include "drmP.h"
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#include "drm_mm.h"
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#include <linux/slab.h>
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#include <linux/seq_file.h>
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#define MM_UNUSED_TARGET 4
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unsigned long drm_mm_tail_space(struct drm_mm *mm)
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{
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struct list_head *tail_node;
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struct drm_mm_node *entry;
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tail_node = mm->ml_entry.prev;
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entry = list_entry(tail_node, struct drm_mm_node, ml_entry);
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if (!entry->free)
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return 0;
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return entry->size;
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}
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int drm_mm_remove_space_from_tail(struct drm_mm *mm, unsigned long size)
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{
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struct list_head *tail_node;
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struct drm_mm_node *entry;
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tail_node = mm->ml_entry.prev;
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entry = list_entry(tail_node, struct drm_mm_node, ml_entry);
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if (!entry->free)
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return -ENOMEM;
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if (entry->size <= size)
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return -ENOMEM;
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entry->size -= size;
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return 0;
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}
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static struct drm_mm_node *drm_mm_kmalloc(struct drm_mm *mm, int atomic)
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{
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struct drm_mm_node *child;
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if (atomic)
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child = kmalloc(sizeof(*child), GFP_ATOMIC);
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else
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child = kmalloc(sizeof(*child), GFP_KERNEL);
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if (unlikely(child == NULL)) {
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spin_lock(&mm->unused_lock);
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if (list_empty(&mm->unused_nodes))
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child = NULL;
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else {
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child =
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list_entry(mm->unused_nodes.next,
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struct drm_mm_node, fl_entry);
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list_del(&child->fl_entry);
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--mm->num_unused;
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}
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spin_unlock(&mm->unused_lock);
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}
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return child;
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}
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/* drm_mm_pre_get() - pre allocate drm_mm_node structure
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* drm_mm: memory manager struct we are pre-allocating for
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*
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* Returns 0 on success or -ENOMEM if allocation fails.
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*/
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int drm_mm_pre_get(struct drm_mm *mm)
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{
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struct drm_mm_node *node;
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spin_lock(&mm->unused_lock);
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while (mm->num_unused < MM_UNUSED_TARGET) {
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spin_unlock(&mm->unused_lock);
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node = kmalloc(sizeof(*node), GFP_KERNEL);
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spin_lock(&mm->unused_lock);
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if (unlikely(node == NULL)) {
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int ret = (mm->num_unused < 2) ? -ENOMEM : 0;
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spin_unlock(&mm->unused_lock);
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return ret;
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}
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++mm->num_unused;
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list_add_tail(&node->fl_entry, &mm->unused_nodes);
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}
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spin_unlock(&mm->unused_lock);
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return 0;
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}
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EXPORT_SYMBOL(drm_mm_pre_get);
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static int drm_mm_create_tail_node(struct drm_mm *mm,
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unsigned long start,
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unsigned long size, int atomic)
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{
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struct drm_mm_node *child;
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child = drm_mm_kmalloc(mm, atomic);
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if (unlikely(child == NULL))
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return -ENOMEM;
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child->free = 1;
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child->size = size;
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child->start = start;
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child->mm = mm;
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list_add_tail(&child->ml_entry, &mm->ml_entry);
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list_add_tail(&child->fl_entry, &mm->fl_entry);
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return 0;
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}
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int drm_mm_add_space_to_tail(struct drm_mm *mm, unsigned long size, int atomic)
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{
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struct list_head *tail_node;
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struct drm_mm_node *entry;
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tail_node = mm->ml_entry.prev;
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entry = list_entry(tail_node, struct drm_mm_node, ml_entry);
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if (!entry->free) {
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return drm_mm_create_tail_node(mm, entry->start + entry->size,
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size, atomic);
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}
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entry->size += size;
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return 0;
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}
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static struct drm_mm_node *drm_mm_split_at_start(struct drm_mm_node *parent,
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unsigned long size,
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int atomic)
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{
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struct drm_mm_node *child;
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child = drm_mm_kmalloc(parent->mm, atomic);
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if (unlikely(child == NULL))
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return NULL;
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INIT_LIST_HEAD(&child->fl_entry);
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child->free = 0;
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child->size = size;
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child->start = parent->start;
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child->mm = parent->mm;
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list_add_tail(&child->ml_entry, &parent->ml_entry);
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INIT_LIST_HEAD(&child->fl_entry);
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parent->size -= size;
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parent->start += size;
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return child;
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}
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struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *node,
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unsigned long size,
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unsigned alignment,
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int atomic)
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{
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struct drm_mm_node *align_splitoff = NULL;
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unsigned tmp = 0;
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if (alignment)
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tmp = node->start % alignment;
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if (tmp) {
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align_splitoff =
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drm_mm_split_at_start(node, alignment - tmp, atomic);
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if (unlikely(align_splitoff == NULL))
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return NULL;
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}
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if (node->size == size) {
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list_del_init(&node->fl_entry);
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node->free = 0;
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} else {
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node = drm_mm_split_at_start(node, size, atomic);
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}
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if (align_splitoff)
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drm_mm_put_block(align_splitoff);
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return node;
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}
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EXPORT_SYMBOL(drm_mm_get_block_generic);
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struct drm_mm_node *drm_mm_get_block_range_generic(struct drm_mm_node *node,
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unsigned long size,
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unsigned alignment,
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unsigned long start,
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unsigned long end,
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int atomic)
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{
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struct drm_mm_node *align_splitoff = NULL;
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unsigned tmp = 0;
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unsigned wasted = 0;
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if (node->start < start)
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wasted += start - node->start;
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if (alignment)
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tmp = ((node->start + wasted) % alignment);
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if (tmp)
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wasted += alignment - tmp;
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if (wasted) {
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align_splitoff = drm_mm_split_at_start(node, wasted, atomic);
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if (unlikely(align_splitoff == NULL))
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return NULL;
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}
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if (node->size == size) {
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list_del_init(&node->fl_entry);
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node->free = 0;
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} else {
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node = drm_mm_split_at_start(node, size, atomic);
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}
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if (align_splitoff)
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drm_mm_put_block(align_splitoff);
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return node;
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}
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EXPORT_SYMBOL(drm_mm_get_block_range_generic);
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/*
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* Put a block. Merge with the previous and / or next block if they are free.
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* Otherwise add to the free stack.
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*/
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void drm_mm_put_block(struct drm_mm_node *cur)
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{
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struct drm_mm *mm = cur->mm;
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struct list_head *cur_head = &cur->ml_entry;
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struct list_head *root_head = &mm->ml_entry;
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struct drm_mm_node *prev_node = NULL;
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struct drm_mm_node *next_node;
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int merged = 0;
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if (cur_head->prev != root_head) {
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prev_node =
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list_entry(cur_head->prev, struct drm_mm_node, ml_entry);
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if (prev_node->free) {
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prev_node->size += cur->size;
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merged = 1;
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}
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}
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if (cur_head->next != root_head) {
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next_node =
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list_entry(cur_head->next, struct drm_mm_node, ml_entry);
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if (next_node->free) {
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if (merged) {
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prev_node->size += next_node->size;
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list_del(&next_node->ml_entry);
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list_del(&next_node->fl_entry);
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spin_lock(&mm->unused_lock);
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if (mm->num_unused < MM_UNUSED_TARGET) {
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list_add(&next_node->fl_entry,
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&mm->unused_nodes);
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++mm->num_unused;
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} else
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kfree(next_node);
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spin_unlock(&mm->unused_lock);
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} else {
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next_node->size += cur->size;
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next_node->start = cur->start;
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merged = 1;
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}
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}
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}
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if (!merged) {
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cur->free = 1;
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list_add(&cur->fl_entry, &mm->fl_entry);
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} else {
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list_del(&cur->ml_entry);
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spin_lock(&mm->unused_lock);
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if (mm->num_unused < MM_UNUSED_TARGET) {
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list_add(&cur->fl_entry, &mm->unused_nodes);
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++mm->num_unused;
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} else
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kfree(cur);
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spin_unlock(&mm->unused_lock);
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}
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}
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EXPORT_SYMBOL(drm_mm_put_block);
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struct drm_mm_node *drm_mm_search_free(const struct drm_mm *mm,
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unsigned long size,
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unsigned alignment, int best_match)
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{
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struct list_head *list;
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const struct list_head *free_stack = &mm->fl_entry;
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struct drm_mm_node *entry;
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struct drm_mm_node *best;
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unsigned long best_size;
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unsigned wasted;
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best = NULL;
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best_size = ~0UL;
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list_for_each(list, free_stack) {
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entry = list_entry(list, struct drm_mm_node, fl_entry);
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wasted = 0;
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if (entry->size < size)
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continue;
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if (alignment) {
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register unsigned tmp = entry->start % alignment;
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if (tmp)
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wasted += alignment - tmp;
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}
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if (entry->size >= size + wasted) {
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if (!best_match)
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return entry;
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if (entry->size < best_size) {
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best = entry;
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best_size = entry->size;
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}
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}
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}
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return best;
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}
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EXPORT_SYMBOL(drm_mm_search_free);
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struct drm_mm_node *drm_mm_search_free_in_range(const struct drm_mm *mm,
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unsigned long size,
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unsigned alignment,
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unsigned long start,
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unsigned long end,
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int best_match)
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{
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struct list_head *list;
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const struct list_head *free_stack = &mm->fl_entry;
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struct drm_mm_node *entry;
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struct drm_mm_node *best;
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unsigned long best_size;
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unsigned wasted;
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best = NULL;
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best_size = ~0UL;
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list_for_each(list, free_stack) {
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entry = list_entry(list, struct drm_mm_node, fl_entry);
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wasted = 0;
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if (entry->size < size)
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continue;
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if (entry->start > end || (entry->start+entry->size) < start)
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continue;
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if (entry->start < start)
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wasted += start - entry->start;
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if (alignment) {
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register unsigned tmp = (entry->start + wasted) % alignment;
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if (tmp)
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wasted += alignment - tmp;
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}
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if (entry->size >= size + wasted &&
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(entry->start + wasted + size) <= end) {
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if (!best_match)
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return entry;
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if (entry->size < best_size) {
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best = entry;
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best_size = entry->size;
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}
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}
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}
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return best;
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}
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EXPORT_SYMBOL(drm_mm_search_free_in_range);
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int drm_mm_clean(struct drm_mm * mm)
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{
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struct list_head *head = &mm->ml_entry;
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return (head->next->next == head);
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}
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EXPORT_SYMBOL(drm_mm_clean);
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int drm_mm_init(struct drm_mm * mm, unsigned long start, unsigned long size)
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{
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INIT_LIST_HEAD(&mm->ml_entry);
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INIT_LIST_HEAD(&mm->fl_entry);
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INIT_LIST_HEAD(&mm->unused_nodes);
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mm->num_unused = 0;
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spin_lock_init(&mm->unused_lock);
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return drm_mm_create_tail_node(mm, start, size, 0);
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}
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EXPORT_SYMBOL(drm_mm_init);
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void drm_mm_takedown(struct drm_mm * mm)
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{
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struct list_head *bnode = mm->fl_entry.next;
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struct drm_mm_node *entry;
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struct drm_mm_node *next;
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entry = list_entry(bnode, struct drm_mm_node, fl_entry);
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if (entry->ml_entry.next != &mm->ml_entry ||
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entry->fl_entry.next != &mm->fl_entry) {
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DRM_ERROR("Memory manager not clean. Delaying takedown\n");
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return;
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}
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list_del(&entry->fl_entry);
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list_del(&entry->ml_entry);
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kfree(entry);
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spin_lock(&mm->unused_lock);
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list_for_each_entry_safe(entry, next, &mm->unused_nodes, fl_entry) {
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list_del(&entry->fl_entry);
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kfree(entry);
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--mm->num_unused;
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}
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spin_unlock(&mm->unused_lock);
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BUG_ON(mm->num_unused != 0);
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}
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EXPORT_SYMBOL(drm_mm_takedown);
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void drm_mm_debug_table(struct drm_mm *mm, const char *prefix)
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{
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struct drm_mm_node *entry;
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int total_used = 0, total_free = 0, total = 0;
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list_for_each_entry(entry, &mm->ml_entry, ml_entry) {
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printk(KERN_DEBUG "%s 0x%08lx-0x%08lx: %8ld: %s\n",
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prefix, entry->start, entry->start + entry->size,
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entry->size, entry->free ? "free" : "used");
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total += entry->size;
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if (entry->free)
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total_free += entry->size;
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else
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total_used += entry->size;
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}
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printk(KERN_DEBUG "%s total: %d, used %d free %d\n", prefix, total,
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total_used, total_free);
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}
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EXPORT_SYMBOL(drm_mm_debug_table);
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#if defined(CONFIG_DEBUG_FS)
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int drm_mm_dump_table(struct seq_file *m, struct drm_mm *mm)
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{
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struct drm_mm_node *entry;
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int total_used = 0, total_free = 0, total = 0;
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list_for_each_entry(entry, &mm->ml_entry, ml_entry) {
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seq_printf(m, "0x%08lx-0x%08lx: 0x%08lx: %s\n", entry->start, entry->start + entry->size, entry->size, entry->free ? "free" : "used");
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total += entry->size;
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if (entry->free)
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total_free += entry->size;
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else
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total_used += entry->size;
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}
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seq_printf(m, "total: %d, used %d free %d\n", total, total_used, total_free);
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return 0;
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}
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EXPORT_SYMBOL(drm_mm_dump_table);
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#endif
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