drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c

   1 // SPDX-License-Identifier: GPL-2.0 OR MIT
   2 /**************************************************************************
   3  *
   4  * Copyright 2007-2010 VMware, Inc., Palo Alto, CA., USA
   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_bo_driver.h>
  33 #include <drm/ttm/ttm_placement.h>
  34 #include <linux/idr.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/kernel.h>
  37
  38 struct vmwgfx_gmrid_man {
  39         struct ttm_resource_manager manager;
  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 struct vmwgfx_gmrid_man *to_gmrid_manager(struct ttm_resource_manager *man)
  48 {
  49         return container_of(man, struct vmwgfx_gmrid_man, manager);
  50 }
  51
  52 static int vmw_gmrid_man_get_node(struct ttm_resource_manager *man,
  53                                   struct ttm_buffer_object *bo,
  54                                   const struct ttm_place *place,
  55                                   struct ttm_resource **res)
  56 {
  57         struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
  58         int id;
  59
  60         *res = kmalloc(sizeof(**res), GFP_KERNEL);
  61         if (!*res)
  62                 return -ENOMEM;
  63
  64         ttm_resource_init(bo, place, *res);
  65
  66         id = ida_alloc_max(&gman->gmr_ida, gman->max_gmr_ids - 1, GFP_KERNEL);
  67         if (id < 0)
  68                 return id;
  69
  70         spin_lock(&gman->lock);
  71
  72         if (gman->max_gmr_pages > 0) {
  73                 gman->used_gmr_pages += (*res)->num_pages;
  74                 if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages))
  75                         goto nospace;
  76         }
  77
  78         (*res)->start = id;
  79
  80         spin_unlock(&gman->lock);
  81         return 0;
  82
  83 nospace:
  84         gman->used_gmr_pages -= (*res)->num_pages;
  85         spin_unlock(&gman->lock);
  86         ida_free(&gman->gmr_ida, id);
  87         kfree(*res);
  88         return -ENOSPC;
  89 }
  90
  91 static void vmw_gmrid_man_put_node(struct ttm_resource_manager *man,
  92                                    struct ttm_resource *res)
  93 {
  94         struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
  95
  96         ida_free(&gman->gmr_ida, res->start);
  97         spin_lock(&gman->lock);
  98         gman->used_gmr_pages -= res->num_pages;
  99         spin_unlock(&gman->lock);
 100         kfree(res);
 101 }
 102
 103 static const struct ttm_resource_manager_func vmw_gmrid_manager_func;
 104
 105 int vmw_gmrid_man_init(struct vmw_private *dev_priv, int type)
 106 {
 107         struct ttm_resource_manager *man;
 108         struct vmwgfx_gmrid_man *gman =
 109                 kzalloc(sizeof(*gman), GFP_KERNEL);
 110
 111         if (unlikely(!gman))
 112                 return -ENOMEM;
 113
 114         man = &gman->manager;
 115
 116         man->func = &vmw_gmrid_manager_func;
 117         /* TODO: This is most likely not correct */
 118         man->use_tt = true;
 119         ttm_resource_manager_init(man, 0);
 120         spin_lock_init(&gman->lock);
 121         gman->used_gmr_pages = 0;
 122         ida_init(&gman->gmr_ida);
 123
 124         switch (type) {
 125         case VMW_PL_GMR:
 126                 gman->max_gmr_ids = dev_priv->max_gmr_ids;
 127                 gman->max_gmr_pages = dev_priv->max_gmr_pages;
 128                 break;
 129         case VMW_PL_MOB:
 130                 gman->max_gmr_ids = VMWGFX_NUM_MOB;
 131                 gman->max_gmr_pages = dev_priv->max_mob_pages;
 132                 break;
 133         default:
 134                 BUG();
 135         }
 136         ttm_set_driver_manager(&dev_priv->bdev, type, &gman->manager);
 137         ttm_resource_manager_set_used(man, true);
 138         return 0;
 139 }
 140
 141 void vmw_gmrid_man_fini(struct vmw_private *dev_priv, int type)
 142 {
 143         struct ttm_resource_manager *man = ttm_manager_type(&dev_priv->bdev, type);
 144         struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
 145
 146         ttm_resource_manager_set_used(man, false);
 147
 148         ttm_resource_manager_evict_all(&dev_priv->bdev, man);
 149
 150         ttm_resource_manager_cleanup(man);
 151
 152         ttm_set_driver_manager(&dev_priv->bdev, type, NULL);
 153         ida_destroy(&gman->gmr_ida);
 154         kfree(gman);
 155
 156 }
 157
 158 static const struct ttm_resource_manager_func vmw_gmrid_manager_func = {
 159         .alloc = vmw_gmrid_man_get_node,
 160         .free = vmw_gmrid_man_put_node,
 161 };