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Diffstat (limited to 'drivers/char/drm/drm_sman.h')
| -rw-r--r-- | drivers/char/drm/drm_sman.h | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/drivers/char/drm/drm_sman.h b/drivers/char/drm/drm_sman.h new file mode 100644 index 00000000000..ddc732a1bf2 --- /dev/null +++ b/drivers/char/drm/drm_sman.h @@ -0,0 +1,176 @@ +/************************************************************************** + * + * 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. + */ + +typedef 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); +} drm_sman_mm_t; + +typedef struct drm_memblock_item { + struct list_head owner_list; + drm_hash_item_t user_hash; + void *mm_info; + drm_sman_mm_t *mm; + struct drm_sman *sman; +} drm_memblock_item_t; + +typedef struct drm_sman { + drm_sman_mm_t *mm; + int num_managers; + drm_open_hash_t owner_hash_tab; + drm_open_hash_t user_hash_tab; + struct list_head owner_items; +} drm_sman_t; + +/* + * 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(drm_sman_t * 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(drm_sman_t * 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(drm_sman_t * 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(drm_sman_t * sman, unsigned int mananger, + drm_sman_mm_t * allocator); + +/* + * Allocate a memory block. Aligment is not implemented yet. + */ + +extern drm_memblock_item_t *drm_sman_alloc(drm_sman_t * sman, + unsigned int manager, + unsigned long size, + unsigned alignment, + unsigned long owner); +/* + * Free a memory block identified by its user hash key. + */ + +extern int drm_sman_free_key(drm_sman_t * sman, unsigned int key); + +/* + * returns 1 iff there are no stale memory blocks associated with this owner. + * Typically called to determine if we need to idle the hardware and call + * drm_sman_owner_cleanup. If there are no stale memory blocks, it removes all + * resources associated with owner. + */ + +extern int drm_sman_owner_clean(drm_sman_t * sman, unsigned long owner); + +/* + * Frees all stale memory blocks associated with this owner. Note that this + * requires that the hardware is finished with all blocks, so the graphics engine + * should be idled before this call is made. This function also frees + * any resources associated with "owner" and should be called when owner + * is not going to be referenced anymore. + */ + +extern void drm_sman_owner_cleanup(drm_sman_t * sman, unsigned long owner); + +/* + * Frees all stale memory blocks associated with the memory manager. + * See idling above. + */ + +extern void drm_sman_cleanup(drm_sman_t * sman); + +#endif |