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         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                                   const struct ttm_place *place,
  50                                   struct ttm_mem_reg *mem)
  51 {
  52         struct vmwgfx_gmrid_man *gman =
  53                 (struct vmwgfx_gmrid_man *)man->priv;
  54         int id;
  55
  56         mem->mm_node = NULL;
  57
  58         id = ida_alloc_max(&gman->gmr_ida, gman->max_gmr_ids - 1, GFP_KERNEL);
  59         if (id < 0)
  60                 return (id != -ENOMEM ? 0 : id);
  61
  62         spin_lock(&gman->lock);
  63
  64         if (gman->max_gmr_pages > 0) {
  65                 gman->used_gmr_pages += bo->num_pages;
  66                 if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages))
  67                         goto nospace;
  68         }
  69
  70         mem->mm_node = gman;
  71         mem->start = id;
  72         mem->num_pages = bo->num_pages;
  73
  74         spin_unlock(&gman->lock);
  75         return 0;
  76
  77 nospace:
  78         gman->used_gmr_pages -= bo->num_pages;
  79         spin_unlock(&gman->lock);
  80         ida_free(&gman->gmr_ida, id);
  81         return 0;
  82 }
  83
  84 static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man,
  85                                    struct ttm_mem_reg *mem)
  86 {
  87         struct vmwgfx_gmrid_man *gman =
  88                 (struct vmwgfx_gmrid_man *)man->priv;
  89
  90         if (mem->mm_node) {
  91                 ida_free(&gman->gmr_ida, mem->start);
  92                 spin_lock(&gman->lock);
  93                 gman->used_gmr_pages -= mem->num_pages;
  94                 spin_unlock(&gman->lock);
  95                 mem->mm_node = NULL;
  96         }
  97 }
  98
  99 static int vmw_gmrid_man_init(struct ttm_mem_type_manager *man,
 100                               unsigned long p_size)
 101 {
 102         struct vmw_private *dev_priv =
 103                 container_of(man->bdev, struct vmw_private, bdev);
 104         struct vmwgfx_gmrid_man *gman =
 105                 kzalloc(sizeof(*gman), GFP_KERNEL);
 106
 107         if (unlikely(!gman))
 108                 return -ENOMEM;
 109
 110         spin_lock_init(&gman->lock);
 111         gman->used_gmr_pages = 0;
 112         ida_init(&gman->gmr_ida);
 113
 114         switch (p_size) {
 115         case VMW_PL_GMR:
 116                 gman->max_gmr_ids = dev_priv->max_gmr_ids;
 117                 gman->max_gmr_pages = dev_priv->max_gmr_pages;
 118                 break;
 119         case VMW_PL_MOB:
 120                 gman->max_gmr_ids = VMWGFX_NUM_MOB;
 121                 gman->max_gmr_pages = dev_priv->max_mob_pages;
 122                 break;
 123         default:
 124                 BUG();
 125         }
 126         man->priv = (void *) gman;
 127         return 0;
 128 }
 129
 130 static int vmw_gmrid_man_takedown(struct ttm_mem_type_manager *man)
 131 {
 132         struct vmwgfx_gmrid_man *gman =
 133                 (struct vmwgfx_gmrid_man *)man->priv;
 134
 135         if (gman) {
 136                 ida_destroy(&gman->gmr_ida);
 137                 kfree(gman);
 138         }
 139         return 0;
 140 }
 141
 142 static void vmw_gmrid_man_debug(struct ttm_mem_type_manager *man,
 143                                 struct drm_printer *printer)
 144 {
 145         drm_printf(printer, "No debug info available for the GMR id manager\n");
 146 }
 147
 148 const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = {
 149         .init = vmw_gmrid_man_init,
 150         .takedown = vmw_gmrid_man_takedown,
 151         .get_node = vmw_gmrid_man_get_node,
 152         .put_node = vmw_gmrid_man_put_node,
 153         .debug = vmw_gmrid_man_debug
 154 };