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Diffstat (limited to 'drivers/char/drm/drm_mm.c')
-rw-r--r--drivers/char/drm/drm_mm.c295
1 files changed, 0 insertions, 295 deletions
diff --git a/drivers/char/drm/drm_mm.c b/drivers/char/drm/drm_mm.c
deleted file mode 100644
index dcff9e9b52e..00000000000
--- a/drivers/char/drm/drm_mm.c
+++ /dev/null
@@ -1,295 +0,0 @@
-/**************************************************************************
- *
- * Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND., USA.
- * 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>
- */
-
-#include "drmP.h"
-#include <linux/slab.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);
- list_add_tail(&child->fl_entry, &mm->fl_entry);
-
- 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);
- INIT_LIST_HEAD(&child->fl_entry);
-
- parent->size -= size;
- parent->start += size;
- return child;
-}
-
-
-
-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;
-}
-
-/*
- * 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);
- } else {
- list_del(&cur->ml_entry);
- drm_free(cur, sizeof(*cur), DRM_MEM_MM);
- }
-}
-
-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);
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-12 16:09:14 +0000