The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/drm2/ttm/ttm_memory.h

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    1 /**************************************************************************
    2  *
    3  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
    4  * All Rights Reserved.
    5  *
    6  * Permission is hereby granted, free of charge, to any person obtaining a
    7  * copy of this software and associated documentation files (the
    8  * "Software"), to deal in the Software without restriction, including
    9  * without limitation the rights to use, copy, modify, merge, publish,
   10  * distribute, sub license, and/or sell copies of the Software, and to
   11  * permit persons to whom the Software is furnished to do so, subject to
   12  * the following conditions:
   13  *
   14  * The above copyright notice and this permission notice (including the
   15  * next paragraph) shall be included in all copies or substantial portions
   16  * of the Software.
   17  *
   18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
   21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
   22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
   23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
   24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
   25  *
   26  **************************************************************************/
   27 /* $FreeBSD$ */
   28 
   29 #ifndef TTM_MEMORY_H
   30 #define TTM_MEMORY_H
   31 
   32 /**
   33  * struct ttm_mem_shrink - callback to shrink TTM memory usage.
   34  *
   35  * @do_shrink: The callback function.
   36  *
   37  * Arguments to the do_shrink functions are intended to be passed using
   38  * inheritance. That is, the argument class derives from struct ttm_mem_shrink,
   39  * and can be accessed using container_of().
   40  */
   41 
   42 struct ttm_mem_shrink {
   43         int (*do_shrink) (struct ttm_mem_shrink *);
   44 };
   45 
   46 /**
   47  * struct ttm_mem_global - Global memory accounting structure.
   48  *
   49  * @shrink: A single callback to shrink TTM memory usage. Extend this
   50  * to a linked list to be able to handle multiple callbacks when needed.
   51  * @swap_queue: A workqueue to handle shrinking in low memory situations. We
   52  * need a separate workqueue since it will spend a lot of time waiting
   53  * for the GPU, and this will otherwise block other workqueue tasks(?)
   54  * At this point we use only a single-threaded workqueue.
   55  * @work: The workqueue callback for the shrink queue.
   56  * @lock: Lock to protect the @shrink - and the memory accounting members,
   57  * that is, essentially the whole structure with some exceptions.
   58  * @zones: Array of pointers to accounting zones.
   59  * @num_zones: Number of populated entries in the @zones array.
   60  * @zone_kernel: Pointer to the kernel zone.
   61  * @zone_highmem: Pointer to the highmem zone if there is one.
   62  * @zone_dma32: Pointer to the dma32 zone if there is one.
   63  *
   64  * Note that this structure is not per device. It should be global for all
   65  * graphics devices.
   66  */
   67 
   68 #define TTM_MEM_MAX_ZONES 2
   69 struct ttm_mem_zone;
   70 struct ttm_mem_global {
   71         u_int kobj_ref;
   72         struct ttm_mem_shrink *shrink;
   73         struct taskqueue *swap_queue;
   74         struct task work;
   75         struct mtx lock;
   76         struct ttm_mem_zone *zones[TTM_MEM_MAX_ZONES];
   77         unsigned int num_zones;
   78         struct ttm_mem_zone *zone_kernel;
   79         struct ttm_mem_zone *zone_dma32;
   80 };
   81 
   82 /**
   83  * ttm_mem_init_shrink - initialize a struct ttm_mem_shrink object
   84  *
   85  * @shrink: The object to initialize.
   86  * @func: The callback function.
   87  */
   88 
   89 static inline void ttm_mem_init_shrink(struct ttm_mem_shrink *shrink,
   90                                        int (*func) (struct ttm_mem_shrink *))
   91 {
   92         shrink->do_shrink = func;
   93 }
   94 
   95 /**
   96  * ttm_mem_register_shrink - register a struct ttm_mem_shrink object.
   97  *
   98  * @glob: The struct ttm_mem_global object to register with.
   99  * @shrink: An initialized struct ttm_mem_shrink object to register.
  100  *
  101  * Returns:
  102  * -EBUSY: There's already a callback registered. (May change).
  103  */
  104 
  105 static inline int ttm_mem_register_shrink(struct ttm_mem_global *glob,
  106                                           struct ttm_mem_shrink *shrink)
  107 {
  108         mtx_lock(&glob->lock);
  109         if (glob->shrink != NULL) {
  110                 mtx_unlock(&glob->lock);
  111                 return -EBUSY;
  112         }
  113         glob->shrink = shrink;
  114         mtx_unlock(&glob->lock);
  115         return 0;
  116 }
  117 
  118 /**
  119  * ttm_mem_unregister_shrink - unregister a struct ttm_mem_shrink object.
  120  *
  121  * @glob: The struct ttm_mem_global object to unregister from.
  122  * @shrink: A previously registert struct ttm_mem_shrink object.
  123  *
  124  */
  125 
  126 static inline void ttm_mem_unregister_shrink(struct ttm_mem_global *glob,
  127                                              struct ttm_mem_shrink *shrink)
  128 {
  129         mtx_lock(&glob->lock);
  130         MPASS(glob->shrink == shrink);
  131         glob->shrink = NULL;
  132         mtx_unlock(&glob->lock);
  133 }
  134 
  135 struct vm_page;
  136 
  137 extern int ttm_mem_global_init(struct ttm_mem_global *glob);
  138 extern void ttm_mem_global_release(struct ttm_mem_global *glob);
  139 extern int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
  140                                 bool no_wait, bool interruptible);
  141 extern void ttm_mem_global_free(struct ttm_mem_global *glob,
  142                                 uint64_t amount);
  143 extern int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
  144                                      struct vm_page *page,
  145                                      bool no_wait, bool interruptible);
  146 extern void ttm_mem_global_free_page(struct ttm_mem_global *glob,
  147                                      struct vm_page *page);
  148 extern size_t ttm_round_pot(size_t size);
  149 #endif

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