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  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
  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.                                   struct ttm_placement *placement,
  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.  
  93. out_err:
  94.         spin_lock(&gman->lock);
  95. out_err_locked:
  96.         gman->used_gmr_pages -= bo->num_pages;
  97.         spin_unlock(&gman->lock);
  98.         return ret;
  99. }
  100.  
  101. static 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.  
  116. static 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->max_gmr_pages = dev_priv->max_gmr_pages;
  129.         gman->used_gmr_pages = 0;
  130.         ida_init(&gman->gmr_ida);
  131.         gman->max_gmr_ids = p_size;
  132.         man->priv = (void *) gman;
  133.         return 0;
  134. }
  135.  
  136. static int vmw_gmrid_man_takedown(struct ttm_mem_type_manager *man)
  137. {
  138.         struct vmwgfx_gmrid_man *gman =
  139.                 (struct vmwgfx_gmrid_man *)man->priv;
  140.  
  141.         if (gman) {
  142.                 ida_destroy(&gman->gmr_ida);
  143.                 kfree(gman);
  144.         }
  145.         return 0;
  146. }
  147.  
  148. static void vmw_gmrid_man_debug(struct ttm_mem_type_manager *man,
  149.                                 const char *prefix)
  150. {
  151.         printk(KERN_INFO "%s: No debug info available for the GMR "
  152.                "id manager.\n", prefix);
  153. }
  154.  
  155. const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = {
  156.         vmw_gmrid_man_init,
  157.         vmw_gmrid_man_takedown,
  158.         vmw_gmrid_man_get_node,
  159.         vmw_gmrid_man_put_node,
  160.         vmw_gmrid_man_debug
  161. };
  162.