2985c96485
Besides some legacy code, vmwgfx is the only user of DRM's hash- table implementation. Copy the code into the driver, so that the core code can be retired. No functional changes. However, the real solution for vmwgfx is to use Linux' generic hash-table functions. v2: * add TODO item for updating vmwgfx (Sam) Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Acked-by: Alex Deucher <alexander.deucher@amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20211129094841.22499-3-tzimmermann@suse.de
84 lines
3.1 KiB
C
84 lines
3.1 KiB
C
/*
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* Copyright 2006 Tungsten Graphics, Inc., Bismack, ND. USA.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* Simple open hash tab implementation.
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*
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* Authors:
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* Thomas Hellström <thomas-at-tungstengraphics-dot-com>
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*/
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/*
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* TODO: Replace this hashtable with Linux' generic implementation
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* from <linux/hashtable.h>.
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*/
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#ifndef VMWGFX_HASHTAB_H
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#define VMWGFX_HASHTAB_H
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#include <linux/list.h>
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#define drm_hash_entry(_ptr, _type, _member) container_of(_ptr, _type, _member)
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struct vmwgfx_hash_item {
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struct hlist_node head;
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unsigned long key;
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};
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struct vmwgfx_open_hash {
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struct hlist_head *table;
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u8 order;
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};
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int vmwgfx_ht_create(struct vmwgfx_open_hash *ht, unsigned int order);
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int vmwgfx_ht_insert_item(struct vmwgfx_open_hash *ht, struct vmwgfx_hash_item *item);
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int vmwgfx_ht_just_insert_please(struct vmwgfx_open_hash *ht, struct vmwgfx_hash_item *item,
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unsigned long seed, int bits, int shift,
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unsigned long add);
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int vmwgfx_ht_find_item(struct vmwgfx_open_hash *ht, unsigned long key,
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struct vmwgfx_hash_item **item);
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void vmwgfx_ht_verbose_list(struct vmwgfx_open_hash *ht, unsigned long key);
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int vmwgfx_ht_remove_key(struct vmwgfx_open_hash *ht, unsigned long key);
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int vmwgfx_ht_remove_item(struct vmwgfx_open_hash *ht, struct vmwgfx_hash_item *item);
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void vmwgfx_ht_remove(struct vmwgfx_open_hash *ht);
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/*
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* RCU-safe interface
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*
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* The user of this API needs to make sure that two or more instances of the
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* hash table manipulation functions are never run simultaneously.
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* The lookup function vmwgfx_ht_find_item_rcu may, however, run simultaneously
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* with any of the manipulation functions as long as it's called from within
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* an RCU read-locked section.
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*/
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#define vmwgfx_ht_insert_item_rcu vmwgfx_ht_insert_item
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#define vmwgfx_ht_just_insert_please_rcu vmwgfx_ht_just_insert_please
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#define vmwgfx_ht_remove_key_rcu vmwgfx_ht_remove_key
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#define vmwgfx_ht_remove_item_rcu vmwgfx_ht_remove_item
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#define vmwgfx_ht_find_item_rcu vmwgfx_ht_find_item
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#endif
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