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_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         struct ttm_resource_manager manager;
  41         spinlock_t lock;
  42         struct ida gmr_ida;
  43         uint32_t max_gmr_ids;
  44         uint32_t max_gmr_pages;
  45         uint32_t used_gmr_pages;
  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 *mem)
  57 {
  58         struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
  59         int id;
  60
  61         id = ida_alloc_max(&gman->gmr_ida, gman->max_gmr_ids - 1, GFP_KERNEL);
  62         if (id < 0)
  63                 return id;
  64
  65         spin_lock(&gman->lock);
  66
  67         if (gman->max_gmr_pages > 0) {
  68                 gman->used_gmr_pages += bo->num_pages;
  69                 if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages))
  70                         goto nospace;
  71         }
  72
  73         mem->mm_node = gman;
  74         mem->start = id;
  75         mem->num_pages = bo->num_pages;
  76
  77         spin_unlock(&gman->lock);
  78         return 0;
  79
  80 nospace:
  81         gman->used_gmr_pages -= bo->num_pages;
  82         spin_unlock(&gman->lock);
  83         ida_free(&gman->gmr_ida, id);
  84         return -ENOSPC;
  85 }
  86
  87 static void vmw_gmrid_man_put_node(struct ttm_resource_manager *man,
  88                                    struct ttm_resource *mem)
  89 {
  90         struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
  91
  92         if (mem->mm_node) {
  93                 ida_free(&gman->gmr_ida, mem->start);
  94                 spin_lock(&gman->lock);
  95                 gman->used_gmr_pages -= mem->num_pages;
  96                 spin_unlock(&gman->lock);
  97                 mem->mm_node = NULL;
  98         }
  99 }
 100
 101 static const struct ttm_resource_manager_func vmw_gmrid_manager_func;
 102
 103 int vmw_gmrid_man_init(struct vmw_private *dev_priv, int type)
 104 {
 105         struct ttm_resource_manager *man;
 106         struct vmwgfx_gmrid_man *gman =
 107                 kzalloc(sizeof(*gman), GFP_KERNEL);
 108
 109         if (unlikely(!gman))
 110                 return -ENOMEM;
 111
 112         man = &gman->manager;
 113
 114         man->func = &vmw_gmrid_manager_func;
 115         /* TODO: This is most likely not correct */
 116         man->use_tt = true;
 117         ttm_resource_manager_init(man, 0);
 118         spin_lock_init(&gman->lock);
 119         gman->used_gmr_pages = 0;
 120         ida_init(&gman->gmr_ida);
 121
 122         switch (type) {
 123         case VMW_PL_GMR:
 124                 gman->max_gmr_ids = dev_priv->max_gmr_ids;
 125                 gman->max_gmr_pages = dev_priv->max_gmr_pages;
 126                 break;
 127         case VMW_PL_MOB:
 128                 gman->max_gmr_ids = VMWGFX_NUM_MOB;
 129                 gman->max_gmr_pages = dev_priv->max_mob_pages;
 130                 break;
 131         default:
 132                 BUG();
 133         }
 134         ttm_set_driver_manager(&dev_priv->bdev, type, &gman->manager);
 135         ttm_resource_manager_set_used(man, true);
 136         return 0;
 137 }
 138
 139 void vmw_gmrid_man_fini(struct vmw_private *dev_priv, int type)
 140 {
 141         struct ttm_resource_manager *man = ttm_manager_type(&dev_priv->bdev, type);
 142         struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
 143
 144         ttm_resource_manager_set_used(man, false);
 145
 146         ttm_resource_manager_evict_all(&dev_priv->bdev, man);
 147
 148         ttm_resource_manager_cleanup(man);
 149
 150         ttm_set_driver_manager(&dev_priv->bdev, type, NULL);
 151         ida_destroy(&gman->gmr_ida);
 152         kfree(gman);
 153
 154 }
 155
 156 static const struct ttm_resource_manager_func vmw_gmrid_manager_func = {
 157         .alloc = vmw_gmrid_man_get_node,
 158         .free = vmw_gmrid_man_put_node,
 159 };