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_placement.h>
  33 #include <linux/idr.h>
  34 #include <linux/spinlock.h>
  35 #include <linux/kernel.h>
  36
  37 struct vmwgfx_gmrid_man {
  38         struct ttm_resource_manager manager;
  39         spinlock_t lock;
  40         struct ida gmr_ida;
  41         uint32_t max_gmr_ids;
  42         uint32_t max_gmr_pages;
  43         uint32_t used_gmr_pages;
  44         uint8_t type;
  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                 ttm_resource_fini(man, *res);
  69                 kfree(*res);
  70                 return id;
  71         }
  72
  73         spin_lock(&gman->lock);
  74
  75         if (gman->max_gmr_pages > 0) {
  76                 gman->used_gmr_pages += PFN_UP((*res)->size);
  77                 /*
  78                  * Because the graphics memory is a soft limit we can try to
  79                  * expand it instead of letting the userspace apps crash.
  80                  * We're just going to have a sane limit (half of RAM)
  81                  * on the number of MOB's that we create and will try to keep
  82                  * the system running until we reach that.
  83                  */
  84                 if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages)) {
  85                         const unsigned long max_graphics_pages = totalram_pages() / 2;
  86                         uint32_t new_max_pages = 0;
  87
  88                         DRM_WARN("vmwgfx: mob memory overflow. Consider increasing guest RAM and graphicsMemory.\n");
  89                         vmw_host_printf("vmwgfx, warning: mob memory overflow. Consider increasing guest RAM and graphicsMemory.\n");
  90
  91                         if (gman->max_gmr_pages > (max_graphics_pages / 2)) {
  92                                 DRM_WARN("vmwgfx: guest requires more than half of RAM for graphics.\n");
  93                                 new_max_pages = max_graphics_pages;
  94                         } else
  95                                 new_max_pages = gman->max_gmr_pages * 2;
  96                         if (new_max_pages > gman->max_gmr_pages && new_max_pages >= gman->used_gmr_pages) {
  97                                 DRM_WARN("vmwgfx: increasing guest mob limits to %u KiB.\n",
  98                                          ((new_max_pages) << (PAGE_SHIFT - 10)));
  99
 100                                 gman->max_gmr_pages = new_max_pages;
 101                         } else {
 102                                 char buf[256];
 103                                 snprintf(buf, sizeof(buf),
 104                                          "vmwgfx, error: guest graphics is out of memory (mob limit at: %u KiB).\n",
 105                                          ((gman->max_gmr_pages) << (PAGE_SHIFT - 10)));
 106                                 vmw_host_printf(buf);
 107                                 DRM_WARN("%s", buf);
 108                                 goto nospace;
 109                         }
 110                 }
 111         }
 112
 113         (*res)->start = id;
 114
 115         spin_unlock(&gman->lock);
 116         return 0;
 117
 118 nospace:
 119         gman->used_gmr_pages -= PFN_UP((*res)->size);
 120         spin_unlock(&gman->lock);
 121         ida_free(&gman->gmr_ida, id);
 122         ttm_resource_fini(man, *res);
 123         kfree(*res);
 124         return -ENOSPC;
 125 }
 126
 127 static void vmw_gmrid_man_put_node(struct ttm_resource_manager *man,
 128                                    struct ttm_resource *res)
 129 {
 130         struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
 131
 132         ida_free(&gman->gmr_ida, res->start);
 133         spin_lock(&gman->lock);
 134         gman->used_gmr_pages -= PFN_UP(res->size);
 135         spin_unlock(&gman->lock);
 136         ttm_resource_fini(man, res);
 137         kfree(res);
 138 }
 139
 140 static void vmw_gmrid_man_debug(struct ttm_resource_manager *man,
 141                                 struct drm_printer *printer)
 142 {
 143         struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
 144
 145         BUG_ON(gman->type != VMW_PL_GMR && gman->type != VMW_PL_MOB);
 146
 147         drm_printf(printer, "%s's used: %u pages, max: %u pages, %u id's\n",
 148                    (gman->type == VMW_PL_MOB) ? "Mob" : "GMR",
 149                    gman->used_gmr_pages, gman->max_gmr_pages, gman->max_gmr_ids);
 150 }
 151
 152 static const struct ttm_resource_manager_func vmw_gmrid_manager_func;
 153
 154 int vmw_gmrid_man_init(struct vmw_private *dev_priv, int type)
 155 {
 156         struct ttm_resource_manager *man;
 157         struct vmwgfx_gmrid_man *gman =
 158                 kzalloc(sizeof(*gman), GFP_KERNEL);
 159
 160         if (unlikely(!gman))
 161                 return -ENOMEM;
 162
 163         man = &gman->manager;
 164
 165         man->func = &vmw_gmrid_manager_func;
 166         man->use_tt = true;
 167         ttm_resource_manager_init(man, &dev_priv->bdev, 0);
 168         spin_lock_init(&gman->lock);
 169         gman->used_gmr_pages = 0;
 170         ida_init(&gman->gmr_ida);
 171         gman->type = type;
 172
 173         switch (type) {
 174         case VMW_PL_GMR:
 175                 gman->max_gmr_ids = dev_priv->max_gmr_ids;
 176                 gman->max_gmr_pages = dev_priv->max_gmr_pages;
 177                 break;
 178         case VMW_PL_MOB:
 179                 gman->max_gmr_ids = VMWGFX_NUM_MOB;
 180                 gman->max_gmr_pages = dev_priv->max_mob_pages;
 181                 break;
 182         default:
 183                 BUG();
 184         }
 185         ttm_set_driver_manager(&dev_priv->bdev, type, &gman->manager);
 186         ttm_resource_manager_set_used(man, true);
 187         return 0;
 188 }
 189
 190 void vmw_gmrid_man_fini(struct vmw_private *dev_priv, int type)
 191 {
 192         struct ttm_resource_manager *man = ttm_manager_type(&dev_priv->bdev, type);
 193         struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
 194
 195         ttm_resource_manager_set_used(man, false);
 196
 197         ttm_resource_manager_evict_all(&dev_priv->bdev, man);
 198
 199         ttm_resource_manager_cleanup(man);
 200
 201         ttm_set_driver_manager(&dev_priv->bdev, type, NULL);
 202         ida_destroy(&gman->gmr_ida);
 203         kfree(gman);
 204
 205 }
 206
 207 static const struct ttm_resource_manager_func vmw_gmrid_manager_func = {
 208         .alloc = vmw_gmrid_man_get_node,
 209         .free = vmw_gmrid_man_put_node,
 210         .debug = vmw_gmrid_man_debug
 211 };