drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c

   1 /**************************************************************************
   2  *
   3  * Copyright (c) 2007-2010 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 /*
  28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  29  */
  30
  31 #include "vmwgfx_drv.h"
  32 #include "ttm/ttm_module.h"
  33 #include "ttm/ttm_bo_driver.h"
  34 #include "ttm/ttm_placement.h"
  35 #include <linux/idr.h>
  36 #include <linux/spinlock.h>
  37 #include <linux/kernel.h>
  38
  39 struct vmwgfx_gmrid_man {
  40         struct ida gmr_ida;
  41         uint32_t max_gmr_ids;
  42 };
  43
  44 static int vmw_gmrid_man_get_node(struct ttm_mem_type_manager *man,
  45                                   struct ttm_buffer_object *bo,
  46                                   struct ttm_placement *placement,
  47                                   struct ttm_mem_reg *mem)
  48 {
  49         struct vmwgfx_gmrid_man *gman =
  50                 (struct vmwgfx_gmrid_man *)man->priv;
  51         int id;
  52
  53         mem->mm_node = NULL;
  54
  55         id = ida_simple_get(&gman->gmr_ida, 0, gman->max_gmr_ids, GFP_KERNEL);
  56         if (id < 0) {
  57                 if (id == -ENOSPC)
  58                         return 0;
  59                 return id;
  60         }
  61         mem->mm_node = gman;
  62         mem->start = id;
  63
  64         return 0;
  65 }
  66
  67 static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man,
  68                                    struct ttm_mem_reg *mem)
  69 {
  70         struct vmwgfx_gmrid_man *gman =
  71                 (struct vmwgfx_gmrid_man *)man->priv;
  72
  73         if (mem->mm_node) {
  74                 ida_simple_remove(&gman->gmr_ida, mem->start);
  75                 mem->mm_node = NULL;
  76         }
  77 }
  78
  79 static int vmw_gmrid_man_init(struct ttm_mem_type_manager *man,
  80                               unsigned long p_size)
  81 {
  82         struct vmwgfx_gmrid_man *gman =
  83                 kzalloc(sizeof(*gman), GFP_KERNEL);
  84
  85         if (unlikely(gman == NULL))
  86                 return -ENOMEM;
  87
  88         ida_init(&gman->gmr_ida);
  89         gman->max_gmr_ids = p_size;
  90         man->priv = (void *) gman;
  91         return 0;
  92 }
  93
  94 static int vmw_gmrid_man_takedown(struct ttm_mem_type_manager *man)
  95 {
  96         struct vmwgfx_gmrid_man *gman =
  97                 (struct vmwgfx_gmrid_man *)man->priv;
  98
  99         if (gman) {
 100                 ida_destroy(&gman->gmr_ida);
 101                 kfree(gman);
 102         }
 103         return 0;
 104 }
 105
 106 static void vmw_gmrid_man_debug(struct ttm_mem_type_manager *man,
 107                                 const char *prefix)
 108 {
 109         printk(KERN_INFO "%s: No debug info available for the GMR "
 110                "id manager.\n", prefix);
 111 }
 112
 113 const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = {
 114         vmw_gmrid_man_init,
 115         vmw_gmrid_man_takedown,
 116         vmw_gmrid_man_get_node,
 117         vmw_gmrid_man_put_node,
 118         vmw_gmrid_man_debug
 119 };