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29 * Simple memory MANager interface that keeps track on allocate regions on a
30 * per "owner" basis. All regions associated with an "owner" can be released
31 * with a simple call. Typically if the "owner" exists. The owner is any
32 * "unsigned long" identifier. Can typically be a pointer to a file private
33 * struct or a context identifier.
36 * Thomas Hellström <thomas-at-tungstengraphics-dot-com>
43 #include "drm_hashtab.h"
46 * A class that is an abstration of a simple memory allocator.
47 * The sman implementation provides a default such allocator
48 * using the drm_mm.c implementation. But the user can replace it.
49 * See the SiS implementation, which may use the SiS FB kernel module
50 * for memory management.
53 typedef struct drm_sman_mm {
54 /* private info. If allocated, needs to be destroyed by the destroy
58 /* Allocate a memory block with given size and alignment.
59 Return an opaque reference to the memory block */
61 void *(*allocate) (void *private, unsigned long size,
64 /* Free a memory block. "ref" is the opaque reference that we got from
65 the "alloc" function */
67 void (*free) (void *private, void *ref);
69 /* Free all resources associated with this allocator */
71 void (*destroy) (void *private);
73 /* Return a memory offset from the opaque reference returned from the
76 unsigned long (*offset) (void *private, void *ref);
79 typedef struct drm_memblock_item {
80 struct list_head owner_list;
81 drm_hash_item_t user_hash;
84 struct drm_sman *sman;
85 } drm_memblock_item_t;
87 typedef struct drm_sman {
90 drm_open_hash_t owner_hash_tab;
91 drm_open_hash_t user_hash_tab;
92 struct list_head owner_items;
96 * Take down a memory manager. This function should only be called after a
97 * successful init and after a call to drm_sman_cleanup.
100 extern void drm_sman_takedown(drm_sman_t * sman);
103 * Allocate structures for a manager.
104 * num_managers are the number of memory pools to manage. (VRAM, AGP, ....)
105 * user_order is the log2 of the number of buckets in the user hash table.
106 * set this to approximately log2 of the max number of memory regions
107 * that will be allocated for _all_ pools together.
108 * owner_order is the log2 of the number of buckets in the owner hash table.
109 * set this to approximately log2 of
110 * the number of client file connections that will
111 * be using the manager.
115 extern int drm_sman_init(drm_sman_t * sman, unsigned int num_managers,
116 unsigned int user_order, unsigned int owner_order);
119 * Initialize a drm_mm.c allocator. Should be called only once for each
120 * manager unless a customized allogator is used.
123 extern int drm_sman_set_range(drm_sman_t * sman, unsigned int manager,
124 unsigned long start, unsigned long size);
127 * Initialize a customized allocator for one of the managers.
128 * (See the SiS module). The object pointed to by "allocator" is copied,
129 * so it can be destroyed after this call.
132 extern int drm_sman_set_manager(drm_sman_t * sman, unsigned int mananger,
133 drm_sman_mm_t * allocator);
136 * Allocate a memory block. Aligment is not implemented yet.
139 extern drm_memblock_item_t *drm_sman_alloc(drm_sman_t * sman,
140 unsigned int manager,
143 unsigned long owner);
145 * Free a memory block identified by its user hash key.
148 extern int drm_sman_free_key(drm_sman_t * sman, unsigned int key);
151 * returns 1 iff there are no stale memory blocks associated with this owner.
152 * Typically called to determine if we need to idle the hardware and call
153 * drm_sman_owner_cleanup. If there are no stale memory blocks, it removes all
154 * resources associated with owner.
157 extern int drm_sman_owner_clean(drm_sman_t * sman, unsigned long owner);
160 * Frees all stale memory blocks associated with this owner. Note that this
161 * requires that the hardware is finished with all blocks, so the graphics engine
162 * should be idled before this call is made. This function also frees
163 * any resources associated with "owner" and should be called when owner
164 * is not going to be referenced anymore.
167 extern void drm_sman_owner_cleanup(drm_sman_t * sman, unsigned long owner);
170 * Frees all stale memory blocks associated with the memory manager.
174 extern void drm_sman_cleanup(drm_sman_t * sman);