Import simple drm memory manager.

This is required for the VIA driver and at least some parts are needed
for GEM.

MFC after:	2 weeks

1 files changed, 180 insertions, 0 deletions

diff --git a/sys/dev/drm/drm_hashtab.c b/sys/dev/drm/drm_hashtab.c
new file mode 100644
index 0000000..e98f102
--- /dev/null
+++ b/sys/dev/drm/drm_hashtab.c
@@ -0,0 +1,180 @@
+/**************************************************************************
+ *
+ * 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.
+ *
+ *
+ **************************************************************************/
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * Simple open hash tab implementation.
+ *
+ * Authors:
+ * Thomas Hellström <thomas-at-tungstengraphics-dot-com>
+ */
+
+#include "dev/drm/drmP.h"
+#include "dev/drm/drm_hashtab.h"
+
+#include <sys/hash.h>
+
+int drm_ht_create(struct drm_open_hash *ht, unsigned int order)
+{
+	ht->size = 1 << order;
+	ht->order = order;
+	ht->table = NULL;
+	ht->table = hashinit(ht->size, DRM_MEM_HASHTAB, &ht->mask);
+	if (!ht->table) {
+		DRM_ERROR("Out of memory for hash table\n");
+		return -ENOMEM;
+	}
+	return 0;
+}
+
+void drm_ht_verbose_list(struct drm_open_hash *ht, unsigned long key)
+{
+	struct drm_hash_item *entry;
+	struct drm_hash_item_list *h_list;
+	unsigned int hashed_key;
+	int count = 0;
+
+	hashed_key = hash32_buf(&key, sizeof(key), ht->order);
+	DRM_DEBUG("Key is 0x%08lx, Hashed key is 0x%08x\n", key, hashed_key);
+	h_list = &ht->table[hashed_key & ht->mask];
+	LIST_FOREACH(entry, h_list, head)
+		DRM_DEBUG("count %d, key: 0x%08lx\n", count++, entry->key);
+}
+
+static struct drm_hash_item *
+drm_ht_find_key(struct drm_open_hash *ht, unsigned long key)
+{
+	struct drm_hash_item *entry;
+	struct drm_hash_item_list *h_list;
+	unsigned int hashed_key;
+
+	hashed_key = hash32_buf(&key, sizeof(key), ht->order);
+	h_list = &ht->table[hashed_key & ht->mask];
+	LIST_FOREACH(entry, h_list, head) {
+		if (entry->key == key)
+			return entry;
+		if (entry->key > key)
+			break;
+	}
+	return NULL;
+}
+
+
+int drm_ht_insert_item(struct drm_open_hash *ht, struct drm_hash_item *item)
+{
+	struct drm_hash_item *entry, *parent;
+	struct drm_hash_item_list *h_list;
+	unsigned int hashed_key;
+	unsigned long key = item->key;
+
+	hashed_key = hash32_buf(&key, sizeof(key), ht->order);
+	h_list = &ht->table[hashed_key & ht->mask];
+	parent = NULL;
+	LIST_FOREACH(entry, h_list, head) {
+		if (entry->key == key)
+			return -EINVAL;
+		if (entry->key > key)
+			break;
+		parent = entry;
+	}
+	if (parent) {
+		LIST_INSERT_AFTER(parent, item, head);
+	} else {
+		LIST_INSERT_HEAD(h_list, item, head);
+	}
+	return 0;
+}
+
+/*
+ * Just insert an item and return any "bits" bit key that hasn't been
+ * used before.
+ */
+int drm_ht_just_insert_please(struct drm_open_hash *ht, struct drm_hash_item *item,
+			      unsigned long seed, int bits, int shift,
+			      unsigned long add)
+{
+	int ret;
+	unsigned long mask = (1 << bits) - 1;
+	unsigned long first, unshifted_key = 0;
+
+	unshifted_key = hash32_buf(&seed, sizeof(seed), unshifted_key);
+	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(struct drm_open_hash *ht, unsigned long key,
+		     struct drm_hash_item **item)
+{
+	struct drm_hash_item *entry;
+
+	entry = drm_ht_find_key(ht, key);
+	if (!entry)
+		return -EINVAL;
+
+	*item = entry;
+	return 0;
+}
+
+int drm_ht_remove_key(struct drm_open_hash *ht, unsigned long key)
+{
+	struct drm_hash_item *entry;
+
+	entry = drm_ht_find_key(ht, key);
+	if (entry) {
+		LIST_REMOVE(entry, head);
+		return 0;
+	}
+	return -EINVAL;
+}
+
+int drm_ht_remove_item(struct drm_open_hash *ht, struct drm_hash_item *item)
+{
+	LIST_REMOVE(item, head);
+	return 0;
+}
+
+void drm_ht_remove(struct drm_open_hash *ht)
+{
+	if (ht->table) {
+		hashdestroy(ht->table, DRM_MEM_HASHTAB, ht->mask);
+		ht->table = NULL;
+	}
+}