LXR linux/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid

   1/**************************************************************************
   2 *
   3 * Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA
   4 * All Rights Reserved.
   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
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  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
  39struct 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
  47static 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 ret = 0;
  55        int id;
  56
  57        mem->mm_node = NULL;
  58
  59        spin_lock(&gman->lock);
  60
  61        if (gman->max_gmr_pages > 0) {
  62                gman->used_gmr_pages += bo->num_pages;
  63                if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages))
  64                        goto out_err_locked;
  65        }
  66
  67        do {
  68                spin_unlock(&gman->lock);
  69                if (unlikely(ida_pre_get(&gman->gmr_ida, GFP_KERNEL) == 0)) {
  70                        ret = -ENOMEM;
  71                        goto out_err;
  72                }
  73                spin_lock(&gman->lock);
  74
  75                ret = ida_get_new(&gman->gmr_ida, &id);
  76                if (unlikely(ret == 0 && id >= gman->max_gmr_ids)) {
  77                        ida_remove(&gman->gmr_ida, id);
  78                        ret = 0;
  79                        goto out_err_locked;
  80                }
  81        } while (ret == -EAGAIN);
  82
  83        if (likely(ret == 0)) {
  84                mem->mm_node = gman;
  85                mem->start = id;
  86                mem->num_pages = bo->num_pages;
  87        } else
  88                goto out_err_locked;
  89
  90        spin_unlock(&gman->lock);
  91        return 0;
  92
  93out_err:
  94        spin_lock(&gman->lock);
  95out_err_locked:
  96        gman->used_gmr_pages -= bo->num_pages;
  97        spin_unlock(&gman->lock);
  98        return ret;
  99}
 100
 101static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man,
 102                                   struct ttm_mem_reg *mem)
 103{
 104        struct vmwgfx_gmrid_man *gman =
 105                (struct vmwgfx_gmrid_man *)man->priv;
 106
 107        if (mem->mm_node) {
 108                spin_lock(&gman->lock);
 109                ida_remove(&gman->gmr_ida, mem->start);
 110                gman->used_gmr_pages -= mem->num_pages;
 111                spin_unlock(&gman->lock);
 112                mem->mm_node = NULL;
 113        }
 114}
 115
 116static int vmw_gmrid_man_init(struct ttm_mem_type_manager *man,
 117                              unsigned long p_size)
 118{
 119        struct vmw_private *dev_priv =
 120                container_of(man->bdev, struct vmw_private, bdev);
 121        struct vmwgfx_gmrid_man *gman =
 122                kzalloc(sizeof(*gman), GFP_KERNEL);
 123
 124        if (unlikely(gman == NULL))
 125                return -ENOMEM;
 126
 127        spin_lock_init(&gman->lock);
 128        gman->used_gmr_pages = 0;
 129        ida_init(&gman->gmr_ida);
 130
 131        switch (p_size) {
 132        case VMW_PL_GMR:
 133                gman->max_gmr_ids = dev_priv->max_gmr_ids;
 134                gman->max_gmr_pages = dev_priv->max_gmr_pages;
 135                break;
 136        case VMW_PL_MOB:
 137                gman->max_gmr_ids = VMWGFX_NUM_MOB;
 138                gman->max_gmr_pages = dev_priv->max_mob_pages;
 139                break;
 140        default:
 141                BUG();
 142        }
 143        man->priv = (void *) gman;
 144        return 0;
 145}
 146
 147static int vmw_gmrid_man_takedown(struct ttm_mem_type_manager *man)
 148{
 149        struct vmwgfx_gmrid_man *gman =
 150                (struct vmwgfx_gmrid_man *)man->priv;
 151
 152        if (gman) {
 153                ida_destroy(&gman->gmr_ida);
 154                kfree(gman);
 155        }
 156        return 0;
 157}
 158
 159static void vmw_gmrid_man_debug(struct ttm_mem_type_manager *man,
 160                                const char *prefix)
 161{
 162        printk(KERN_INFO "%s: No debug info available for the GMR "
 163               "id manager.\n", prefix);
 164}
 165
 166const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = {
 167        vmw_gmrid_man_init,
 168        vmw_gmrid_man_takedown,
 169        vmw_gmrid_man_get_node,
 170        vmw_gmrid_man_put_node,
 171        vmw_gmrid_man_debug
 172};
 173