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 <drm/ttm/ttm_module.h>
  33 #include <drm/ttm/ttm_bo_driver.h>
  34 #include <drm/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                                   uint32_t flags,
  51                                   struct ttm_mem_reg *mem)
  52 {
  53         struct vmwgfx_gmrid_man *gman =
  54                 (struct vmwgfx_gmrid_man *)man->priv;
  55         int ret = 0;
  56         int id;
  57
  58         mem->mm_node = NULL;
  59
  60         spin_lock(&gman->lock);
  61
  62         if (gman->max_gmr_pages > 0) {
  63                 gman->used_gmr_pages += bo->num_pages;
  64                 if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages))
  65                         goto out_err_locked;
  66         }
  67
  68         do {
  69                 spin_unlock(&gman->lock);
  70                 if (unlikely(ida_pre_get(&gman->gmr_ida, GFP_KERNEL) == 0)) {
  71                         ret = -ENOMEM;
  72                         goto out_err;
  73                 }
  74                 spin_lock(&gman->lock);
  75
  76                 ret = ida_get_new(&gman->gmr_ida, &id);
  77                 if (unlikely(ret == 0 && id >= gman->max_gmr_ids)) {
  78                         ida_remove(&gman->gmr_ida, id);
  79                         ret = 0;
  80                         goto out_err_locked;
  81                 }
  82         } while (ret == -EAGAIN);
  83
  84         if (likely(ret == 0)) {
  85                 mem->mm_node = gman;
  86                 mem->start = id;
  87                 mem->num_pages = bo->num_pages;
  88         } else
  89                 goto out_err_locked;
  90
  91         spin_unlock(&gman->lock);
  92         return 0;
  93
  94 out_err:
  95         spin_lock(&gman->lock);
  96 out_err_locked:
  97         gman->used_gmr_pages -= bo->num_pages;
  98         spin_unlock(&gman->lock);
  99         return ret;
 100 }
 101
 102 static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man,
 103                                    struct ttm_mem_reg *mem)
 104 {
 105         struct vmwgfx_gmrid_man *gman =
 106                 (struct vmwgfx_gmrid_man *)man->priv;
 107
 108         if (mem->mm_node) {
 109                 spin_lock(&gman->lock);
 110                 ida_remove(&gman->gmr_ida, mem->start);
 111                 gman->used_gmr_pages -= mem->num_pages;
 112                 spin_unlock(&gman->lock);
 113                 mem->mm_node = NULL;
 114         }
 115 }
 116
 117 static int vmw_gmrid_man_init(struct ttm_mem_type_manager *man,
 118                               unsigned long p_size)
 119 {
 120         struct vmw_private *dev_priv =
 121                 container_of(man->bdev, struct vmw_private, bdev);
 122         struct vmwgfx_gmrid_man *gman =
 123                 kzalloc(sizeof(*gman), GFP_KERNEL);
 124
 125         if (unlikely(gman == NULL))
 126                 return -ENOMEM;
 127
 128         spin_lock_init(&gman->lock);
 129         gman->used_gmr_pages = 0;
 130         ida_init(&gman->gmr_ida);
 131
 132         switch (p_size) {
 133         case VMW_PL_GMR:
 134                 gman->max_gmr_ids = dev_priv->max_gmr_ids;
 135                 gman->max_gmr_pages = dev_priv->max_gmr_pages;
 136                 break;
 137         case VMW_PL_MOB:
 138                 gman->max_gmr_ids = VMWGFX_NUM_MOB;
 139                 gman->max_gmr_pages = dev_priv->max_mob_pages;
 140                 break;
 141         default:
 142                 BUG();
 143         }
 144         man->priv = (void *) gman;
 145         return 0;
 146 }
 147
 148 static int vmw_gmrid_man_takedown(struct ttm_mem_type_manager *man)
 149 {
 150         struct vmwgfx_gmrid_man *gman =
 151                 (struct vmwgfx_gmrid_man *)man->priv;
 152
 153         if (gman) {
 154                 ida_destroy(&gman->gmr_ida);
 155                 kfree(gman);
 156         }
 157         return 0;
 158 }
 159
 160 static void vmw_gmrid_man_debug(struct ttm_mem_type_manager *man,
 161                                 const char *prefix)
 162 {
 163         printk(KERN_INFO "%s: No debug info available for the GMR "
 164                "id manager.\n", prefix);
 165 }
 166
 167 const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = {
 168         vmw_gmrid_man_init,
 169         vmw_gmrid_man_takedown,
 170         vmw_gmrid_man_get_node,
 171         vmw_gmrid_man_put_node,
 172         vmw_gmrid_man_debug
 173 };