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         uint8_t type;
  46 };
  47
  48 static struct vmwgfx_gmrid_man *to_gmrid_manager(struct ttm_resource_manager *man)
  49 {
  50         return container_of(man, struct vmwgfx_gmrid_man, manager);
  51 }
  52
  53 static int vmw_gmrid_man_get_node(struct ttm_resource_manager *man,
  54                                   struct ttm_buffer_object *bo,
  55                                   const struct ttm_place *place,
  56                                   struct ttm_resource **res)
  57 {
  58         struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
  59         int id;
  60
  61         *res = kmalloc(sizeof(**res), GFP_KERNEL);
  62         if (!*res)
  63                 return -ENOMEM;
  64
  65         ttm_resource_init(bo, place, *res);
  66
  67         id = ida_alloc_max(&gman->gmr_ida, gman->max_gmr_ids - 1, GFP_KERNEL);
  68         if (id < 0)
  69                 return id;
  70
  71         spin_lock(&gman->lock);
  72
  73         if (gman->max_gmr_pages > 0) {
  74                 gman->used_gmr_pages += (*res)->num_pages;
  75                 /*
  76                  * Because the graphics memory is a soft limit we can try to
  77                  * expand it instead of letting the userspace apps crash.
  78                  * We're just going to have a sane limit (half of RAM)
  79                  * on the number of MOB's that we create and will try to keep
  80                  * the system running until we reach that.
  81                  */
  82                 if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages)) {
  83                         const unsigned long max_graphics_pages = totalram_pages() / 2;
  84                         uint32_t new_max_pages = 0;
  85
  86                         DRM_WARN("vmwgfx: mob memory overflow. Consider increasing guest RAM and graphicsMemory.\n");
  87                         vmw_host_printf("vmwgfx, warning: mob memory overflow. Consider increasing guest RAM and graphicsMemory.\n");
  88
  89                         if (gman->max_gmr_pages > (max_graphics_pages / 2)) {
  90                                 DRM_WARN("vmwgfx: guest requires more than half of RAM for graphics.\n");
  91                                 new_max_pages = max_graphics_pages;
  92                         } else
  93                                 new_max_pages = gman->max_gmr_pages * 2;
  94                         if (new_max_pages > gman->max_gmr_pages && new_max_pages >= gman->used_gmr_pages) {
  95                                 DRM_WARN("vmwgfx: increasing guest mob limits to %u kB.\n",
  96                                          ((new_max_pages) << (PAGE_SHIFT - 10)));
  97
  98                                 gman->max_gmr_pages = new_max_pages;
  99                         } else {
 100                                 char buf[256];
 101                                 snprintf(buf, sizeof(buf),
 102                                          "vmwgfx, error: guest graphics is out of memory (mob limit at: %ukB).\n",
 103                                          ((gman->max_gmr_pages) << (PAGE_SHIFT - 10)));
 104                                 vmw_host_printf(buf);
 105                                 DRM_WARN("%s", buf);
 106                                 goto nospace;
 107                         }
 108                 }
 109         }
 110
 111         (*res)->start = id;
 112
 113         spin_unlock(&gman->lock);
 114         return 0;
 115
 116 nospace:
 117         gman->used_gmr_pages -= (*res)->num_pages;
 118         spin_unlock(&gman->lock);
 119         ida_free(&gman->gmr_ida, id);
 120         ttm_resource_fini(man, *res);
 121         kfree(*res);
 122         return -ENOSPC;
 123 }
 124
 125 static void vmw_gmrid_man_put_node(struct ttm_resource_manager *man,
 126                                    struct ttm_resource *res)
 127 {
 128         struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
 129
 130         ida_free(&gman->gmr_ida, res->start);
 131         spin_lock(&gman->lock);
 132         gman->used_gmr_pages -= res->num_pages;
 133         spin_unlock(&gman->lock);
 134         ttm_resource_fini(man, res);
 135         kfree(res);
 136 }
 137
 138 static void vmw_gmrid_man_debug(struct ttm_resource_manager *man,
 139                                 struct drm_printer *printer)
 140 {
 141         struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
 142
 143         BUG_ON(gman->type != VMW_PL_GMR && gman->type != VMW_PL_MOB);
 144
 145         drm_printf(printer, "%s's used: %u pages, max: %u pages, %u id's\n",
 146                    (gman->type == VMW_PL_MOB) ? "Mob" : "GMR",
 147                    gman->used_gmr_pages, gman->max_gmr_pages, gman->max_gmr_ids);
 148 }
 149
 150 static const struct ttm_resource_manager_func vmw_gmrid_manager_func;
 151
 152 int vmw_gmrid_man_init(struct vmw_private *dev_priv, int type)
 153 {
 154         struct ttm_resource_manager *man;
 155         struct vmwgfx_gmrid_man *gman =
 156                 kzalloc(sizeof(*gman), GFP_KERNEL);
 157
 158         if (unlikely(!gman))
 159                 return -ENOMEM;
 160
 161         man = &gman->manager;
 162
 163         man->func = &vmw_gmrid_manager_func;
 164         man->use_tt = true;
 165         ttm_resource_manager_init(man, &dev_priv->bdev, 0);
 166         spin_lock_init(&gman->lock);
 167         gman->used_gmr_pages = 0;
 168         ida_init(&gman->gmr_ida);
 169         gman->type = type;
 170
 171         switch (type) {
 172         case VMW_PL_GMR:
 173                 gman->max_gmr_ids = dev_priv->max_gmr_ids;
 174                 gman->max_gmr_pages = dev_priv->max_gmr_pages;
 175                 break;
 176         case VMW_PL_MOB:
 177                 gman->max_gmr_ids = VMWGFX_NUM_MOB;
 178                 gman->max_gmr_pages = dev_priv->max_mob_pages;
 179                 break;
 180         default:
 181                 BUG();
 182         }
 183         ttm_set_driver_manager(&dev_priv->bdev, type, &gman->manager);
 184         ttm_resource_manager_set_used(man, true);
 185         return 0;
 186 }
 187
 188 void vmw_gmrid_man_fini(struct vmw_private *dev_priv, int type)
 189 {
 190         struct ttm_resource_manager *man = ttm_manager_type(&dev_priv->bdev, type);
 191         struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
 192
 193         ttm_resource_manager_set_used(man, false);
 194
 195         ttm_resource_manager_evict_all(&dev_priv->bdev, man);
 196
 197         ttm_resource_manager_cleanup(man);
 198
 199         ttm_set_driver_manager(&dev_priv->bdev, type, NULL);
 200         ida_destroy(&gman->gmr_ida);
 201         kfree(gman);
 202
 203 }
 204
 205 static const struct ttm_resource_manager_func vmw_gmrid_manager_func = {
 206         .alloc = vmw_gmrid_man_get_node,
 207         .free = vmw_gmrid_man_put_node,
 208         .debug = vmw_gmrid_man_debug
 209 };