Merge branch 'master' into upstream

1 files changed, 190 insertions, 0 deletions

diff --git a/drivers/char/drm/drm_hashtab.c b/drivers/char/drm/drm_hashtab.c
new file mode 100644
index 000000000000..a0b2d6802ae4
--- /dev/null
+++ b/drivers/char/drm/drm_hashtab.c
@@ -0,0 +1,190 @@
+/**************************************************************************
+ *
+ * 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 Hellström <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 -EINVAL;
+                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 -EINVAL;
+
+        *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 -EINVAL;
+}
+
+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;
+        }
+}
+