177 lines
5.8 KiB
C
177 lines
5.8 KiB
C
/**************************************************************************
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*
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* Copyright 2006 Tungsten Graphics, Inc., Bismarck, 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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**************************************************************************/
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/*
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* Simple memory MANager interface that keeps track on allocate regions on a
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* per "owner" basis. All regions associated with an "owner" can be released
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* with a simple call. Typically if the "owner" exists. The owner is any
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* "unsigned long" identifier. Can typically be a pointer to a file private
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* struct or a context identifier.
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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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#ifndef DRM_SMAN_H
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#define DRM_SMAN_H
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#include "drmP.h"
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#include "drm_hashtab.h"
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/*
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* A class that is an abstration of a simple memory allocator.
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* The sman implementation provides a default such allocator
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* using the drm_mm.c implementation. But the user can replace it.
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* See the SiS implementation, which may use the SiS FB kernel module
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* for memory management.
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*/
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struct drm_sman_mm {
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/* private info. If allocated, needs to be destroyed by the destroy
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function */
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void *private;
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/* Allocate a memory block with given size and alignment.
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Return an opaque reference to the memory block */
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void *(*allocate) (void *private, unsigned long size,
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unsigned alignment);
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/* Free a memory block. "ref" is the opaque reference that we got from
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the "alloc" function */
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void (*free) (void *private, void *ref);
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/* Free all resources associated with this allocator */
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void (*destroy) (void *private);
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/* Return a memory offset from the opaque reference returned from the
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"alloc" function */
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unsigned long (*offset) (void *private, void *ref);
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};
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struct drm_memblock_item {
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struct list_head owner_list;
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drm_hash_item_t user_hash;
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void *mm_info;
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struct drm_sman_mm *mm;
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struct drm_sman *sman;
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};
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struct drm_sman {
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struct drm_sman_mm *mm;
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int num_managers;
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drm_open_hash_t owner_hash_tab;
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drm_open_hash_t user_hash_tab;
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struct list_head owner_items;
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};
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/*
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* Take down a memory manager. This function should only be called after a
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* successful init and after a call to drm_sman_cleanup.
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*/
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extern void drm_sman_takedown(struct drm_sman * sman);
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/*
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* Allocate structures for a manager.
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* num_managers are the number of memory pools to manage. (VRAM, AGP, ....)
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* user_order is the log2 of the number of buckets in the user hash table.
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* set this to approximately log2 of the max number of memory regions
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* that will be allocated for _all_ pools together.
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* owner_order is the log2 of the number of buckets in the owner hash table.
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* set this to approximately log2 of
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* the number of client file connections that will
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* be using the manager.
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*
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*/
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extern int drm_sman_init(struct drm_sman * sman, unsigned int num_managers,
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unsigned int user_order, unsigned int owner_order);
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/*
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* Initialize a drm_mm.c allocator. Should be called only once for each
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* manager unless a customized allogator is used.
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*/
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extern int drm_sman_set_range(struct drm_sman * sman, unsigned int manager,
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unsigned long start, unsigned long size);
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/*
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* Initialize a customized allocator for one of the managers.
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* (See the SiS module). The object pointed to by "allocator" is copied,
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* so it can be destroyed after this call.
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*/
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extern int drm_sman_set_manager(struct drm_sman * sman, unsigned int mananger,
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struct drm_sman_mm * allocator);
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/*
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* Allocate a memory block. Aligment is not implemented yet.
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*/
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extern struct drm_memblock_item *drm_sman_alloc(struct drm_sman * sman,
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unsigned int manager,
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unsigned long size,
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unsigned alignment,
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unsigned long owner);
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/*
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* Free a memory block identified by its user hash key.
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*/
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extern int drm_sman_free_key(struct drm_sman * sman, unsigned int key);
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/*
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* returns 1 iff there are no stale memory blocks associated with this owner.
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* Typically called to determine if we need to idle the hardware and call
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* drm_sman_owner_cleanup. If there are no stale memory blocks, it removes all
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* resources associated with owner.
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*/
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extern int drm_sman_owner_clean(struct drm_sman * sman, unsigned long owner);
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/*
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* Frees all stale memory blocks associated with this owner. Note that this
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* requires that the hardware is finished with all blocks, so the graphics engine
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* should be idled before this call is made. This function also frees
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* any resources associated with "owner" and should be called when owner
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* is not going to be referenced anymore.
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*/
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extern void drm_sman_owner_cleanup(struct drm_sman * sman, unsigned long owner);
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/*
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* Frees all stale memory blocks associated with the memory manager.
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* See idling above.
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*/
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extern void drm_sman_cleanup(struct drm_sman * sman);
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#endif
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