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/**************************************************************************
*
* 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 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>
*/
#ifndef DRM_SMAN_H
#define DRM_SMAN_H
#include "drmP.h"
#include "drm_hashtab.h"
/*
* A class that is an abstration of a simple memory allocator.
* The sman implementation provides a default such allocator
* using the drm_mm.c implementation. But the user can replace it.
* See the SiS implementation, which may use the SiS FB kernel module
* for memory management.
*/
struct drm_sman_mm {
/* private info. If allocated, needs to be destroyed by the destroy
function */
void *private;
/* Allocate a memory block with given size and alignment.
Return an opaque reference to the memory block */
void *(*allocate) (void *private, unsigned long size,
unsigned alignment);
/* Free a memory block. "ref" is the opaque reference that we got from
the "alloc" function */
void (*free) (void *private, void *ref);
/* Free all resources associated with this allocator */
void (*destroy) (void *private);
/* Return a memory offset from the opaque reference returned from the
"alloc" function */
unsigned long (*offset) (void *private, void *ref);
};
struct drm_memblock_item {
struct list_head owner_list;
struct drm_hash_item user_hash;
void *mm_info;
struct drm_sman_mm *mm;
struct drm_sman *sman;
};
struct drm_sman {
struct drm_sman_mm *mm;
int num_managers;
};
/*
* Take down a memory manager. This function should only be called after a
* successful init and after a call to drm_sman_cleanup.
*/
extern void drm_sman_takedown(struct drm_sman * sman);
/*
* Allocate structures for a manager.
* num_managers are the number of memory pools to manage. (VRAM, AGP, ....)
* user_order is the log2 of the number of buckets in the user hash table.
* set this to approximately log2 of the max number of memory regions
* that will be allocated for _all_ pools together.
* owner_order is the log2 of the number of buckets in the owner hash table.
* set this to approximately log2 of
* the number of client file connections that will
* be using the manager.
*
*/
extern int drm_sman_init(struct drm_sman * sman, unsigned int num_managers,
unsigned int user_order, unsigned int owner_order);
/*
* Initialize a drm_mm.c allocator. Should be called only once for each
* manager unless a customized allogator is used.
*/
extern int drm_sman_set_range(struct drm_sman * sman, unsigned int manager,
unsigned long start, unsigned long size);
/*
* Initialize a customized allocator for one of the managers.
* (See the SiS module). The object pointed to by "allocator" is copied,
* so it can be destroyed after this call.
*/
extern int drm_sman_set_manager(struct drm_sman * sman, unsigned int mananger,
struct drm_sman_mm * allocator);
/*
* Allocate a memory block. Aligment is not implemented yet.
*/
extern struct drm_memblock_item *drm_sman_alloc(struct drm_sman * sman,
unsigned int manager,
unsigned long size,
unsigned alignment,
unsigned long owner);
extern void drm_sman_free(struct drm_memblock_item *item);
/*
* Frees all stale memory blocks associated with the memory manager.
* See idling above.
*/
extern void drm_sman_cleanup(struct drm_sman * sman);
#endif
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