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: Dave Airlie <airlied@linux.ie>

1 files changed, 352 insertions, 0 deletions

diff --git a/drivers/char/drm/drm_sman.c b/drivers/char/drm/drm_sman.c
new file mode 100644
index 000000000000..baba91398911
--- /dev/null
+++ b/drivers/char/drm/drm_sman.c
@@ -0,0 +1,352 @@
+/**************************************************************************
+ *
+ * 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 Hellström <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);