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         spinlock_t lock;
  41         struct ida gmr_ida;
  42         uint32_t max_gmr_ids;
  43         uint32_t max_gmr_pages;
  44         uint32_t used_gmr_pages;
  45 };
  46
  47 static int vmw_gmrid_man_get_node(struct ttm_mem_type_manager *man,
  48                                   struct ttm_buffer_object *bo,
  49                                   struct ttm_placement *placement,
  50                                   struct ttm_mem_reg *mem)
  51 {
  52         struct vmwgfx_gmrid_man *gman =
  53                 (struct vmwgfx_gmrid_man *)man->priv;
  54         int ret = 0;
  55         int id;
  56
  57         mem->mm_node = NULL;
  58
  59         spin_lock(&gman->lock);
  60
  61         if (gman->max_gmr_pages > 0) {
  62                 gman->used_gmr_pages += bo->num_pages;
  63                 if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages))
  64                         goto out_err_locked;
  65         }
  66
  67         do {
  68                 spin_unlock(&gman->lock);
  69                 if (unlikely(ida_pre_get(&gman->gmr_ida, GFP_KERNEL) == 0)) {
  70                         ret = -ENOMEM;
  71                         goto out_err;
  72                 }
  73                 spin_lock(&gman->lock);
  74
  75                 ret = ida_get_new(&gman->gmr_ida, &id);
  76                 if (unlikely(ret == 0 && id >= gman->max_gmr_ids)) {
  77                         ida_remove(&gman->gmr_ida, id);
  78                         ret = 0;
  79                         goto out_err_locked;
  80                 }
  81         } while (ret == -EAGAIN);
  82
  83         if (likely(ret == 0)) {
  84                 mem->mm_node = gman;
  85                 mem->start = id;
  86                 mem->num_pages = bo->num_pages;
  87         } else
  88                 goto out_err_locked;
  89
  90         spin_unlock(&gman->lock);
  91         return 0;
  92
  93 out_err:
  94         spin_lock(&gman->lock);
  95 out_err_locked:
  96         gman->used_gmr_pages -= bo->num_pages;
  97         spin_unlock(&gman->lock);
  98         return ret;
  99 }
 100
 101 static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man,
 102                                    struct ttm_mem_reg *mem)
 103 {
 104         struct vmwgfx_gmrid_man *gman =
 105                 (struct vmwgfx_gmrid_man *)man->priv;
 106
 107         if (mem->mm_node) {
 108                 spin_lock(&gman->lock);
 109                 ida_remove(&gman->gmr_ida, mem->start);
 110                 gman->used_gmr_pages -= mem->num_pages;
 111                 spin_unlock(&gman->lock);
 112                 mem->mm_node = NULL;
 113         }
 114 }
 115
 116 static int vmw_gmrid_man_init(struct ttm_mem_type_manager *man,
 117                               unsigned long p_size)
 118 {
 119         struct vmw_private *dev_priv =
 120                 container_of(man->bdev, struct vmw_private, bdev);
 121         struct vmwgfx_gmrid_man *gman =
 122                 kzalloc(sizeof(*gman), GFP_KERNEL);
 123
 124         if (unlikely(gman == NULL))
 125                 return -ENOMEM;
 126
 127         spin_lock_init(&gman->lock);
 128         gman->max_gmr_pages = dev_priv->max_gmr_pages;
 129         gman->used_gmr_pages = 0;
 130         ida_init(&gman->gmr_ida);
 131         gman->max_gmr_ids = p_size;
 132         man->priv = (void *) gman;
 133         return 0;
 134 }
 135
 136 static int vmw_gmrid_man_takedown(struct ttm_mem_type_manager *man)
 137 {
 138         struct vmwgfx_gmrid_man *gman =
 139                 (struct vmwgfx_gmrid_man *)man->priv;
 140
 141         if (gman) {
 142                 ida_destroy(&gman->gmr_ida);
 143                 kfree(gman);
 144         }
 145         return 0;
 146 }
 147
 148 static void vmw_gmrid_man_debug(struct ttm_mem_type_manager *man,
 149                                 const char *prefix)
 150 {
 151         printk(KERN_INFO "%s: No debug info available for the GMR "
 152                "id manager.\n", prefix);
 153 }
 154
 155 const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = {
 156         vmw_gmrid_man_init,
 157         vmw_gmrid_man_takedown,
 158         vmw_gmrid_man_get_node,
 159         vmw_gmrid_man_put_node,
 160         vmw_gmrid_man_debug
 161 };