drm: add simple DRM memory manager, and hash table

This adds the DRM hashtable and simple memory manager implementations from
Tungsten Graphics, this is NOT the new memory manager, this is a replacement
for the SIS and VIA memory managers.
Signed-off-by: NDave Airlie <airlied@linux.ie>

drivers/char/drm/Makefile

@@ -6,7 +6,7 @@ drm-objs    :=	drm_auth.o drm_bufs.o drm_context.o drm_dma.o drm_drawable.o \
 		drm_drv.o drm_fops.o drm_ioctl.o drm_irq.o \
 		drm_lock.o drm_memory.o drm_proc.o drm_stub.o drm_vm.o \
 		drm_agpsupport.o drm_scatter.o ati_pcigart.o drm_pci.o \
-		drm_sysfs.o
+		drm_sysfs.o drm_hashtab.o drm_sman.o drm_mm.o
 
 tdfx-objs   := tdfx_drv.o
 r128-objs   := r128_drv.o r128_cce.o r128_state.o r128_irq.o

drivers/char/drm/drmP.h

@@ -79,6 +79,7 @@
 #define __OS_HAS_MTRR (defined(CONFIG_MTRR))
 
 #include "drm_os_linux.h"
+#include "drm_hashtab.h"
 
 /***********************************************************************/
 /** \name DRM template customization defaults */
@@ -134,7 +135,9 @@
 #define DRM_MEM_CTXBITMAP 18
 #define DRM_MEM_STUB      19
 #define DRM_MEM_SGLISTS   20
-#define DRM_MEM_CTXLIST  21
+#define DRM_MEM_CTXLIST   21
+#define DRM_MEM_MM        22
+#define DRM_MEM_HASHTAB   23
 
 #define DRM_MAX_CTXBITMAP (PAGE_SIZE * 8)
 
@@ -515,6 +518,22 @@ typedef struct ati_pcigart_info {
 	drm_local_map_t mapping;
 } drm_ati_pcigart_info;
 
+/*
+ * Generic memory manager structs
+ */
+typedef struct drm_mm_node {
+	struct list_head fl_entry;
+	struct list_head ml_entry;
+	int free;
+	unsigned long start;
+	unsigned long size;
+	void *private;
+} drm_mm_node_t;
+
+typedef struct drm_mm {
+	drm_mm_node_t root_node;
+} drm_mm_t;
+
 /**
  * DRM driver structure. This structure represent the common code for
  * a family of cards. There will one drm_device for each card present
@@ -1001,6 +1020,18 @@ extern struct class_device *drm_sysfs_device_add(struct class *cs,
 						 drm_head_t *head);
 extern void drm_sysfs_device_remove(struct class_device *class_dev);
 
+/*
+ * Basic memory manager support (drm_mm.c)
+ */
+extern drm_mm_node_t *drm_mm_get_block(drm_mm_node_t * parent,
+				       unsigned long size,
+				       unsigned alignment);
+extern void drm_mm_put_block(drm_mm_t *mm, drm_mm_node_t *cur);
+extern drm_mm_node_t *drm_mm_search_free(const drm_mm_t *mm, unsigned long size,
+					 unsigned alignment, int best_match);
+extern int drm_mm_init(drm_mm_t *mm, unsigned long start, unsigned long size);
+extern void drm_mm_takedown(drm_mm_t *mm);
+
 /* Inline replacements for DRM_IOREMAP macros */
 static __inline__ void drm_core_ioremap(struct drm_map *map,
 					struct drm_device *dev)

drivers/char/drm/drm_hashtab.c

+/**************************************************************************
+ *
+ * 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.
+ *
+ *
+ **************************************************************************/
+/*
+ * Simple open hash tab implementation.
+ *
+ * Authors:
+ * Thomas Hellstrm <thomas-at-tungstengraphics-dot-com>
+ */
+
+#include "drmP.h"
+#include "drm_hashtab.h"
+#include <linux/hash.h>
+
+int drm_ht_create(drm_open_hash_t *ht, unsigned int order)
+{
+	unsigned int i;
+
+	ht->size = 1 << order;
+	ht->order = order;
+	ht->fill = 0;
+	ht->table = vmalloc(ht->size*sizeof(*ht->table));
+	if (!ht->table) {
+		DRM_ERROR("Out of memory for hash table\n");
+		return -ENOMEM;
+	}
+	for (i=0; i< ht->size; ++i) {
+		INIT_HLIST_HEAD(&ht->table[i]);
+	}
+	return 0;
+}
+
+void drm_ht_verbose_list(drm_open_hash_t *ht, unsigned long key)
+{
+	drm_hash_item_t *entry;
+	struct hlist_head *h_list;
+	struct hlist_node *list;
+	unsigned int hashed_key;
+	int count = 0;
+
+	hashed_key = hash_long(key, ht->order);
+	DRM_DEBUG("Key is 0x%08lx, Hashed key is 0x%08x\n", key, hashed_key);
+	h_list = &ht->table[hashed_key];
+	hlist_for_each(list, h_list) {
+		entry = hlist_entry(list, drm_hash_item_t, head);
+		DRM_DEBUG("count %d, key: 0x%08lx\n", count++, entry->key);
+	}
+}
+
+static struct hlist_node *drm_ht_find_key(drm_open_hash_t *ht, 
+					  unsigned long key)
+{
+	drm_hash_item_t *entry;
+	struct hlist_head *h_list;
+	struct hlist_node *list;
+	unsigned int hashed_key;
+
+	hashed_key = hash_long(key, ht->order);
+	h_list = &ht->table[hashed_key];
+	hlist_for_each(list, h_list) {
+		entry = hlist_entry(list, drm_hash_item_t, head);
+		if (entry->key == key)
+			return list;
+		if (entry->key > key)
+			break;
+	}
+	return NULL;
+}
+
+
+int drm_ht_insert_item(drm_open_hash_t *ht, drm_hash_item_t *item)
+{
+	drm_hash_item_t *entry;
+	struct hlist_head *h_list;
+	struct hlist_node *list, *parent;
+	unsigned int hashed_key;
+	unsigned long key = item->key;
+
+	hashed_key = hash_long(key, ht->order);
+	h_list = &ht->table[hashed_key];
+	parent = NULL;
+	hlist_for_each(list, h_list) {
+		entry = hlist_entry(list, drm_hash_item_t, head);
+		if (entry->key == key)
+			return -1;
+		if (entry->key > key)
+			break;
+		parent = list;
+	}
+	if (parent) {
+		hlist_add_after(parent, &item->head);
+	} else {
+		hlist_add_head(&item->head, h_list);
+	}
+	return 0;
+}
+
+/*
+ * Just insert an item and return any "bits" bit key that hasn't been 
+ * used before.
+ */
+int drm_ht_just_insert_please(drm_open_hash_t *ht, drm_hash_item_t *item,
+			      unsigned long seed, int bits, int shift,
+			      unsigned long add)
+{
+	int ret;
+	unsigned long mask = (1 << bits) - 1;
+	unsigned long first, unshifted_key;
+
+	unshifted_key = hash_long(seed, bits);
+	first = unshifted_key;
+	do {
+		item->key = (unshifted_key << shift) + add;
+		ret = drm_ht_insert_item(ht, item);
+		if (ret)
+			unshifted_key = (unshifted_key + 1) & mask;
+	} while(ret && (unshifted_key != first));
+
+	if (ret) {
+		DRM_ERROR("Available key bit space exhausted\n");
+		return -EINVAL;
+	}
+	return 0;
+}
+
+int drm_ht_find_item(drm_open_hash_t *ht, unsigned long key,
+		     drm_hash_item_t **item)
+{
+	struct hlist_node *list;
+
+	list = drm_ht_find_key(ht, key);
+	if (!list)
+		return -1;
+
+	*item = hlist_entry(list, drm_hash_item_t, head);
+	return 0;
+}
+
+int drm_ht_remove_key(drm_open_hash_t *ht, unsigned long key)
+{
+	struct hlist_node *list;
+
+	list = drm_ht_find_key(ht, key);
+	if (list) {
+		hlist_del_init(list);
+		ht->fill--;
+		return 0;
+	}
+	return -1;
+}
+
+int drm_ht_remove_item(drm_open_hash_t *ht, drm_hash_item_t *item)
+{
+	hlist_del_init(&item->head);
+	ht->fill--;
+	return 0;
+}
+
+void drm_ht_remove(drm_open_hash_t *ht)
+{
+	if (ht->table) {
+		vfree(ht->table);
+		ht->table = NULL;
+	}
+}
+

drivers/char/drm/drm_hashtab.h

+/**************************************************************************
+ *
+ * Copyright 2006 Tungsten Graphics, Inc., Bismack, 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.
+ *
+ *
+ **************************************************************************/
+/*
+ * Simple open hash tab implementation.
+ *
+ * Authors:
+ * Thomas Hellström <thomas-at-tungstengraphics-dot-com>
+ */
+
+#ifndef DRM_HASHTAB_H
+#define DRM_HASHTAB_H
+
+#define drm_hash_entry(_ptr, _type, _member) container_of(_ptr, _type, _member)
+
+typedef struct drm_hash_item{
+	struct hlist_node head;
+	unsigned long key;
+} drm_hash_item_t;
+
+typedef struct drm_open_hash{
+	unsigned int size;
+	unsigned int order;
+	unsigned int fill;
+	struct hlist_head *table;
+} drm_open_hash_t;
+
+
+extern int drm_ht_create(drm_open_hash_t *ht, unsigned int order);
+extern int drm_ht_insert_item(drm_open_hash_t *ht, drm_hash_item_t *item);
+extern int drm_ht_just_insert_please(drm_open_hash_t *ht, drm_hash_item_t *item,
+				     unsigned long seed, int bits, int shift,
+				     unsigned long add);
+extern int drm_ht_find_item(drm_open_hash_t *ht, unsigned long key, drm_hash_item_t **item);
+
+extern void drm_ht_verbose_list(drm_open_hash_t *ht, unsigned long key);
+extern int drm_ht_remove_key(drm_open_hash_t *ht, unsigned long key);
+extern int drm_ht_remove_item(drm_open_hash_t *ht, drm_hash_item_t *item);
+extern void drm_ht_remove(drm_open_hash_t *ht);
+
+
+#endif
+

drivers/char/drm/drm_mm.c

+/**************************************************************************
+ *
+ * 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 Hellstrm <thomas-at-tungstengraphics-dot-com>
+ */
+
+#include "drmP.h"
+
+drm_mm_node_t *drm_mm_get_block(drm_mm_node_t * parent,
+				unsigned long size, unsigned alignment)
+{
+
+	drm_mm_node_t *child;
+
+	if (alignment)
+		size += alignment - 1;
+
+	if (parent->size == size) {
+		list_del_init(&parent->fl_entry);
+		parent->free = FALSE;
+		return parent;
+	} else {
+		child = (drm_mm_node_t *) drm_alloc(sizeof(*child), DRM_MEM_MM);
+		if (!child)
+			return NULL;
+
+		INIT_LIST_HEAD(&child->ml_entry);
+		INIT_LIST_HEAD(&child->fl_entry);
+
+		child->free = FALSE;
+		child->size = size;
+		child->start = parent->start;
+
+		list_add_tail(&child->ml_entry, &parent->ml_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(drm_mm_t * mm, drm_mm_node_t * cur)
+{
+
+	drm_mm_node_t *list_root = &mm->root_node;
+	struct list_head *cur_head = &cur->ml_entry;
+	struct list_head *root_head = &list_root->ml_entry;
+	drm_mm_node_t *prev_node = NULL;
+	drm_mm_node_t *next_node;
+
+	int merged = FALSE;
+
+	if (cur_head->prev != root_head) {
+		prev_node = list_entry(cur_head->prev, drm_mm_node_t, ml_entry);
+		if (prev_node->free) {
+			prev_node->size += cur->size;
+			merged = TRUE;
+		}
+	}
+	if (cur_head->next != root_head) {
+		next_node = list_entry(cur_head->next, drm_mm_node_t, 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 = TRUE;
+			}
+		}
+	}
+	if (!merged) {
+		cur->free = TRUE;
+		list_add(&cur->fl_entry, &list_root->fl_entry);
+	} else {
+		list_del(&cur->ml_entry);
+		drm_free(cur, sizeof(*cur), DRM_MEM_MM);
+	}
+}
+
+drm_mm_node_t *drm_mm_search_free(const drm_mm_t * mm,
+				  unsigned long size,
+				  unsigned alignment, int best_match)
+{
+	struct list_head *list;
+	const struct list_head *free_stack = &mm->root_node.fl_entry;
+	drm_mm_node_t *entry;
+	drm_mm_node_t *best;
+	unsigned long best_size;
+
+	best = NULL;
+	best_size = ~0UL;
+
+	if (alignment)
+		size += alignment - 1;
+
+	list_for_each(list, free_stack) {
+		entry = list_entry(list, drm_mm_node_t, fl_entry);
+		if (entry->size >= size) {
+			if (!best_match)
+				return entry;
+			if (size < best_size) {
+				best = entry;
+				best_size = entry->size;
+			}
+		}
+	}
+
+	return best;
+}
+
+int drm_mm_init(drm_mm_t * mm, unsigned long start, unsigned long size)
+{
+	drm_mm_node_t *child;
+
+	INIT_LIST_HEAD(&mm->root_node.ml_entry);
+	INIT_LIST_HEAD(&mm->root_node.fl_entry);
+	child = (drm_mm_node_t *) drm_alloc(sizeof(*child), DRM_MEM_MM);
+	if (!child)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&child->ml_entry);
+	INIT_LIST_HEAD(&child->fl_entry);
+
+	child->start = start;
+	child->size = size;
+	child->free = TRUE;
+
+	list_add(&child->fl_entry, &mm->root_node.fl_entry);
+	list_add(&child->ml_entry, &mm->root_node.ml_entry);
+
+	return 0;
+}
+
+EXPORT_SYMBOL(drm_mm_init);
+
+void drm_mm_takedown(drm_mm_t * mm)
+{
+	struct list_head *bnode = mm->root_node.fl_entry.next;
+	drm_mm_node_t *entry;
+
+	entry = list_entry(bnode, drm_mm_node_t, fl_entry);
+
+	if (entry->ml_entry.next != &mm->root_node.ml_entry ||
+	    entry->fl_entry.next != &mm->root_node.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);
+}
+
+EXPORT_SYMBOL(drm_mm_takedown);

drivers/char/drm/drm_sman.c

+/**************************************************************************
+ *
+ * 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 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.
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ *
+ **************************************************************************/
+/*
+ * Simple memory manager interface that keeps track on allocate regions on a
+ * per "owner" basis. All regions associated with an "owner" can be released
+ * with a simple call. Typically if the "owner" exists. The owner is any
+ * "unsigned long" identifier. Can typically be a pointer to a file private
+ * struct or a context identifier.
+ *
+ * Authors:
+ * Thomas Hellstrm <thomas-at-tungstengraphics-dot-com>
+ */
+
+#include "drm_sman.h"
+
+typedef struct drm_owner_item {
+	drm_hash_item_t owner_hash;
+	struct list_head sman_list;
+	struct list_head mem_blocks;
+} drm_owner_item_t;
+
+void drm_sman_takedown(drm_sman_t * sman)
+{
+	drm_ht_remove(&sman->user_hash_tab);
+	drm_ht_remove(&sman->owner_hash_tab);
+	if (sman->mm)
+		drm_free(sman->mm, sman->num_managers * sizeof(*sman->mm),
+			 DRM_MEM_MM);
+}
+
+EXPORT_SYMBOL(drm_sman_takedown);
+
+int
+drm_sman_init(drm_sman_t * sman, unsigned int num_managers,
+	      unsigned int user_order, unsigned int owner_order)
+{
+	int ret = 0;
+
+	sman->mm = (drm_sman_mm_t *) drm_calloc(num_managers, sizeof(*sman->mm),
+						DRM_MEM_MM);
+	if (!sman->mm) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	sman->num_managers = num_managers;
+	INIT_LIST_HEAD(&sman->owner_items);
+	ret = drm_ht_create(&sman->owner_hash_tab, owner_order);
+	if (ret)
+		goto out1;
+	ret = drm_ht_create(&sman->user_hash_tab, user_order);
+	if (!ret)
+		goto out;
+
+	drm_ht_remove(&sman->owner_hash_tab);
+out1:
+	drm_free(sman->mm, num_managers * sizeof(*sman->mm), DRM_MEM_MM);
+out:
+	return ret;
+}
+
+EXPORT_SYMBOL(drm_sman_init);
+
+static void *drm_sman_mm_allocate(void *private, unsigned long size,
+				  unsigned alignment)
+{
+	drm_mm_t *mm = (drm_mm_t *) private;
+	drm_mm_node_t *tmp;
+
+	tmp = drm_mm_search_free(mm, size, alignment, TRUE);
+	if (!tmp) {
+		return NULL;
+	}
+	tmp = drm_mm_get_block(tmp, size, alignment);
+	return tmp;
+}
+
+static void drm_sman_mm_free(void *private, void *ref)
+{
+	drm_mm_t *mm = (drm_mm_t *) private;
+	drm_mm_node_t *node = (drm_mm_node_t *) ref;
+
+	drm_mm_put_block(mm, node);
+}
+
+static void drm_sman_mm_destroy(void *private)
+{
+	drm_mm_t *mm = (drm_mm_t *) private;
+	drm_mm_takedown(mm);
+	drm_free(mm, sizeof(*mm), DRM_MEM_MM);
+}
+
+unsigned long drm_sman_mm_offset(void *private, void *ref)
+{
+	drm_mm_node_t *node = (drm_mm_node_t *) ref;
+	return node->start;
+}
+
+int
+drm_sman_set_range(drm_sman_t * sman, unsigned int manager,
+		   unsigned long start, unsigned long size)
+{
+	drm_sman_mm_t *sman_mm;
+	drm_mm_t *mm;
+	int ret;
+
+	BUG_ON(manager >= sman->num_managers);
+
+	sman_mm = &sman->mm[manager];
+	mm = drm_calloc(1, sizeof(*mm), DRM_MEM_MM);
+	if (!mm) {
+		return -ENOMEM;
+	}
+	sman_mm->private = mm;
+	ret = drm_mm_init(mm, start, size);
+
+	if (ret) {
+		drm_free(mm, sizeof(*mm), DRM_MEM_MM);
+		return ret;
+	}
+
+	sman_mm->allocate = drm_sman_mm_allocate;
+	sman_mm->free = drm_sman_mm_free;
+	sman_mm->destroy = drm_sman_mm_destroy;
+	sman_mm->offset = drm_sman_mm_offset;
+
+	return 0;
+}
+
+EXPORT_SYMBOL(drm_sman_set_range);
+
+int
+drm_sman_set_manager(drm_sman_t * sman, unsigned int manager,
+		     drm_sman_mm_t * allocator)
+{
+	BUG_ON(manager >= sman->num_managers);
+	sman->mm[manager] = *allocator;
+
+	return 0;
+}
+
+static drm_owner_item_t *drm_sman_get_owner_item(drm_sman_t * sman,
+						 unsigned long owner)
+{
+	int ret;
+	drm_hash_item_t *owner_hash_item;
+	drm_owner_item_t *owner_item;
+
+	ret = drm_ht_find_item(&sman->owner_hash_tab, owner, &owner_hash_item);
+	if (!ret) {
+		return drm_hash_entry(owner_hash_item, drm_owner_item_t,
+				      owner_hash);
+	}
+
+	owner_item = drm_calloc(1, sizeof(*owner_item), DRM_MEM_MM);
+	if (!owner_item)
+		goto out;
+
+	INIT_LIST_HEAD(&owner_item->mem_blocks);
+	owner_item->owner_hash.key = owner;
+	if (drm_ht_insert_item(&sman->owner_hash_tab, &owner_item->owner_hash))
+		goto out1;
+
+	list_add_tail(&owner_item->sman_list, &sman->owner_items);
+	return owner_item;
+
+out1:
+	drm_free(owner_item, sizeof(*owner_item), DRM_MEM_MM);
+out:
+	return NULL;
+}
+
+drm_memblock_item_t *drm_sman_alloc(drm_sman_t *sman, unsigned int manager,
+				    unsigned long size, unsigned alignment,
+				    unsigned long owner)
+{
+	void *tmp;
+	drm_sman_mm_t *sman_mm;
+	drm_owner_item_t *owner_item;
+	drm_memblock_item_t *memblock;
+
+	BUG_ON(manager >= sman->num_managers);
+
+	sman_mm = &sman->mm[manager];
+	tmp = sman_mm->allocate(sman_mm->private, size, alignment);
+
+	if (!tmp) {
+		return NULL;
+	}
+
+	memblock = drm_calloc(1, sizeof(*memblock), DRM_MEM_MM);
+
+	if (!memblock)
+		goto out;
+
+	memblock->mm_info = tmp;
+	memblock->mm = sman_mm;
+	memblock->sman = sman;
+
+	if (drm_ht_just_insert_please
+	    (&sman->user_hash_tab, &memblock->user_hash,
+	     (unsigned long)memblock, 32, 0, 0))
+		goto out1;
+
+	owner_item = drm_sman_get_owner_item(sman, owner);
+	if (!owner_item)
+		goto out2;
+
+	list_add_tail(&memblock->owner_list, &owner_item->mem_blocks);
+
+	return memblock;
+
+out2:
+	drm_ht_remove_item(&sman->user_hash_tab, &memblock->user_hash);
+out1:
+	drm_free(memblock, sizeof(*memblock), DRM_MEM_MM);
+out:
+	sman_mm->free(sman_mm->private, tmp);
+
+	return NULL;
+}
+
+EXPORT_SYMBOL(drm_sman_alloc);
+
+static void drm_sman_free(drm_memblock_item_t *item)
+{
+	drm_sman_t *sman = item->sman;
+
+	list_del(&item->owner_list);
+	drm_ht_remove_item(&sman->user_hash_tab, &item->user_hash);
+	item->mm->free(item->mm->private, item->mm_info);
+	drm_free(item, sizeof(*item), DRM_MEM_MM);
+}
+
+int drm_sman_free_key(drm_sman_t *sman, unsigned int key)
+{
+	drm_hash_item_t *hash_item;
+	drm_memblock_item_t *memblock_item;
+
+	if (drm_ht_find_item(&sman->user_hash_tab, key, &hash_item))
+		return -EINVAL;
+
+	memblock_item = drm_hash_entry(hash_item, drm_memblock_item_t, user_hash);
+	drm_sman_free(memblock_item);
+	return 0;
+}
+
+EXPORT_SYMBOL(drm_sman_free_key);
+
+static void drm_sman_remove_owner(drm_sman_t *sman,
+				  drm_owner_item_t *owner_item)
+{
+	list_del(&owner_item->sman_list);
+	drm_ht_remove_item(&sman->owner_hash_tab, &owner_item->owner_hash);
+	drm_free(owner_item, sizeof(*owner_item), DRM_MEM_MM);
+}
+
+int drm_sman_owner_clean(drm_sman_t *sman, unsigned long owner)
+{
+
+	drm_hash_item_t *hash_item;
+	drm_owner_item_t *owner_item;
+
+	if (drm_ht_find_item(&sman->owner_hash_tab, owner, &hash_item)) {
+		return -1;
+	}
+
+	owner_item = drm_hash_entry(hash_item, drm_owner_item_t, owner_hash);
+	if (owner_item->mem_blocks.next == &owner_item->mem_blocks) {
+		drm_sman_remove_owner(sman, owner_item);
+		return -1;
+	}
+
+	return 0;
+}
+
+EXPORT_SYMBOL(drm_sman_owner_clean);
+
+static void drm_sman_do_owner_cleanup(drm_sman_t *sman,
+				      drm_owner_item_t *owner_item)
+{
+	drm_memblock_item_t *entry, *next;
+
+	list_for_each_entry_safe(entry, next, &owner_item->mem_blocks,
+				 owner_list) {
+		drm_sman_free(entry);
+	}
+	drm_sman_remove_owner(sman, owner_item);
+}
+
+void drm_sman_owner_cleanup(drm_sman_t *sman, unsigned long owner)
+{
+
+	drm_hash_item_t *hash_item;
+	drm_owner_item_t *owner_item;
+
+	if (drm_ht_find_item(&sman->owner_hash_tab, owner, &hash_item)) {
+
+		return;
+	}
+
+	owner_item = drm_hash_entry(hash_item, drm_owner_item_t, owner_hash);
+	drm_sman_do_owner_cleanup(sman, owner_item);
+}
+
+EXPORT_SYMBOL(drm_sman_owner_cleanup);
+
+void drm_sman_cleanup(drm_sman_t *sman)
+{
+	drm_owner_item_t *entry, *next;
+	unsigned int i;
+	drm_sman_mm_t *sman_mm;
+
+	list_for_each_entry_safe(entry, next, &sman->owner_items, sman_list) {
+		drm_sman_do_owner_cleanup(sman, entry);
+	}
+	if (sman->mm) {
+		for (i = 0; i < sman->num_managers; ++i) {
+			sman_mm = &sman->mm[i];
+			if (sman_mm->private) {
+				sman_mm->destroy(sman_mm->private);
+				sman_mm->private = NULL;
+			}
+		}
+	}
+}
+
+EXPORT_SYMBOL(drm_sman_cleanup);

drivers/char/drm/drm_sman.h

+/**************************************************************************
+ *
+ * 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.
+ *
+ *
+ **************************************************************************/
+/*
+ * Simple memory MANager interface that keeps track on allocate regions on a
+ * per "owner" basis. All regions associated with an "owner" can be released
+ * with a simple call. Typically if the "owner" exists. The owner is any
+ * "unsigned long" identifier. Can typically be a pointer to a file private
+ * struct or a context identifier.
+ *
+ * Authors:
+ * Thomas Hellström <thomas-at-tungstengraphics-dot-com>
+ */
+
+#ifndef DRM_SMAN_H
+#define DRM_SMAN_H
+
+#include "drmP.h"
+#include "drm_hashtab.h"
+
+/*
+ * A class that is an abstration of a simple memory allocator.
+ * The sman implementation provides a default such allocator
+ * using the drm_mm.c implementation. But the user can replace it.
+ * See the SiS implementation, which may use the SiS FB kernel module
+ * for memory management.
+ */
+
+typedef struct drm_sman_mm {
+	/* private info. If allocated, needs to be destroyed by the destroy
+	   function */
+	void *private;
+
+	/* Allocate a memory block with given size and alignment.
+	   Return an opaque reference to the memory block */
+
+	void *(*allocate) (void *private, unsigned long size,
+			   unsigned alignment);
+
+	/* Free a memory block. "ref" is the opaque reference that we got from
+	   the "alloc" function */
+
+	void (*free) (void *private, void *ref);
+
+	/* Free all resources associated with this allocator */
+
+	void (*destroy) (void *private);
+
+	/* Return a memory offset from the opaque reference returned from the
+	   "alloc" function */
+
+	unsigned long (*offset) (void *private, void *ref);
+} drm_sman_mm_t;
+
+typedef struct drm_memblock_item {
+	struct list_head owner_list;
+	drm_hash_item_t user_hash;
+	void *mm_info;
+	drm_sman_mm_t *mm;
+	struct drm_sman *sman;
+} drm_memblock_item_t;
+
+typedef struct drm_sman {
+	drm_sman_mm_t *mm;
+	int num_managers;
+	drm_open_hash_t owner_hash_tab;
+	drm_open_hash_t user_hash_tab;
+	struct list_head owner_items;
+} drm_sman_t;
+
+/*
+ * Take down a memory manager. This function should only be called after a
+ * successful init and after a call to drm_sman_cleanup.
+ */
+
+extern void drm_sman_takedown(drm_sman_t * sman);
+
+/*
+ * Allocate structures for a manager.
+ * num_managers are the number of memory pools to manage. (VRAM, AGP, ....)
+ * user_order is the log2 of the number of buckets in the user hash table.
+ *	    set this to approximately log2 of the max number of memory regions
+ *	    that will be allocated for _all_ pools together.
+ * owner_order is the log2 of the number of buckets in the owner hash table.
+ *	    set this to approximately log2 of
+ *	    the number of client file connections that will
+ *	    be using the manager.
+ *
+ */
+
+extern int drm_sman_init(drm_sman_t * sman, unsigned int num_managers,
+			 unsigned int user_order, unsigned int owner_order);
+
+/*
+ * Initialize a drm_mm.c allocator. Should be called only once for each
+ * manager unless a customized allogator is used.
+ */
+
+extern int drm_sman_set_range(drm_sman_t * sman, unsigned int manager,
+			      unsigned long start, unsigned long size);
+
+/*
+ * Initialize a customized allocator for one of the managers.
+ * (See the SiS module). The object pointed to by "allocator" is copied,
+ * so it can be destroyed after this call.
+ */
+
+extern int drm_sman_set_manager(drm_sman_t * sman, unsigned int mananger,
+				drm_sman_mm_t * allocator);
+
+/*
+ * Allocate a memory block. Aligment is not implemented yet.
+ */
+
+extern drm_memblock_item_t *drm_sman_alloc(drm_sman_t * sman,
+					   unsigned int manager,
+					   unsigned long size,
+					   unsigned alignment,
+					   unsigned long owner);
+/*
+ * Free a memory block identified by its user hash key.
+ */
+
+extern int drm_sman_free_key(drm_sman_t * sman, unsigned int key);
+
+/*
+ * returns TRUE iff there are no stale memory blocks associated with this owner.
+ * Typically called to determine if we need to idle the hardware and call
+ * drm_sman_owner_cleanup. If there are no stale memory blocks, it removes all
+ * resources associated with owner.
+ */
+
+extern int drm_sman_owner_clean(drm_sman_t * sman, unsigned long owner);
+
+/*
+ * Frees all stale memory blocks associated with this owner. Note that this
+ * requires that the hardware is finished with all blocks, so the graphics engine
+ * should be idled before this call is made. This function also frees
+ * any resources associated with "owner" and should be called when owner
+ * is not going to be referenced anymore.
+ */
+
+extern void drm_sman_owner_cleanup(drm_sman_t * sman, unsigned long owner);
+
+/*
+ * Frees all stale memory blocks associated with the memory manager.
+ * See idling above.
+ */
+
+extern void drm_sman_cleanup(drm_sman_t * sman);
+
+#endif