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4075 Serge 1 
/**************************************************************************
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 *
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 * Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA
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 * All Rights Reserved.
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a
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 * copy of this software and associated documentation files (the
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 * "Software"), to deal in the Software without restriction, including
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 * without limitation the rights to use, copy, modify, merge, publish,
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 * distribute, sub license, and/or sell copies of the Software, and to
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 * permit persons to whom the Software is furnished to do so, subject to
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 * the following conditions:
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 *
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 * The above copyright notice and this permission notice (including the
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 * next paragraph) shall be included in all copies or substantial portions
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 * of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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 * USE OR OTHER DEALINGS IN THE SOFTWARE.
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 *
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 **************************************************************************/
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/*
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 * Authors: Thomas Hellstrom
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 */
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#include "vmwgfx_drv.h"
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#include
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#include
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#include
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#include
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#include
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#include
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struct vmwgfx_gmrid_man {
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	spinlock_t lock;
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	struct ida gmr_ida;
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	uint32_t max_gmr_ids;
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	uint32_t max_gmr_pages;
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	uint32_t used_gmr_pages;
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};
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static int vmw_gmrid_man_get_node(struct ttm_mem_type_manager *man,
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				  struct ttm_buffer_object *bo,
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				  struct ttm_placement *placement,
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				  struct ttm_mem_reg *mem)
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{
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	struct vmwgfx_gmrid_man *gman =
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		(struct vmwgfx_gmrid_man *)man->priv;
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	int ret = 0;
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	int id;
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	mem->mm_node = NULL;
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	spin_lock(&gman->lock);
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	if (gman->max_gmr_pages > 0) {
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		gman->used_gmr_pages += bo->num_pages;
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		if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages))
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			goto out_err_locked;
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	}
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	do {
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		spin_unlock(&gman->lock);
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		if (unlikely(ida_pre_get(&gman->gmr_ida, GFP_KERNEL) == 0)) {
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			ret = -ENOMEM;
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			goto out_err;
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		}
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		spin_lock(&gman->lock);
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		ret = ida_get_new(&gman->gmr_ida, &id);
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		if (unlikely(ret == 0 && id >= gman->max_gmr_ids)) {
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			ida_remove(&gman->gmr_ida, id);
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			ret = 0;
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			goto out_err_locked;
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		}
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	} while (ret == -EAGAIN);
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	if (likely(ret == 0)) {
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		mem->mm_node = gman;
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		mem->start = id;
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		mem->num_pages = bo->num_pages;
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	} else
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		goto out_err_locked;
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	spin_unlock(&gman->lock);
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	return 0;
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out_err:
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	spin_lock(&gman->lock);
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out_err_locked:
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	gman->used_gmr_pages -= bo->num_pages;
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	spin_unlock(&gman->lock);
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	return ret;
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}
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static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man,
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				   struct ttm_mem_reg *mem)
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{
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	struct vmwgfx_gmrid_man *gman =
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		(struct vmwgfx_gmrid_man *)man->priv;
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	if (mem->mm_node) {
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		spin_lock(&gman->lock);
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		ida_remove(&gman->gmr_ida, mem->start);
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		gman->used_gmr_pages -= mem->num_pages;
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		spin_unlock(&gman->lock);
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		mem->mm_node = NULL;
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	}
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}
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static int vmw_gmrid_man_init(struct ttm_mem_type_manager *man,
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			      unsigned long p_size)
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{
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	struct vmw_private *dev_priv =
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		container_of(man->bdev, struct vmw_private, bdev);
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	struct vmwgfx_gmrid_man *gman =
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		kzalloc(sizeof(*gman), GFP_KERNEL);
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	if (unlikely(gman == NULL))
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		return -ENOMEM;
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	spin_lock_init(&gman->lock);
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	gman->max_gmr_pages = dev_priv->max_gmr_pages;
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	gman->used_gmr_pages = 0;
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	ida_init(&gman->gmr_ida);
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	gman->max_gmr_ids = p_size;
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	man->priv = (void *) gman;
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	return 0;
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}
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static int vmw_gmrid_man_takedown(struct ttm_mem_type_manager *man)
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{
138 
	struct vmwgfx_gmrid_man *gman =
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		(struct vmwgfx_gmrid_man *)man->priv;
140 
 
141 
	if (gman) {
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		ida_destroy(&gman->gmr_ida);
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		kfree(gman);
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	}
145 
	return 0;
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}
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 "
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	       "id manager.\n", prefix);
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}
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155 
const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = {
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	vmw_gmrid_man_init,
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	vmw_gmrid_man_takedown,
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	vmw_gmrid_man_get_node,
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	vmw_gmrid_man_put_node,
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	vmw_gmrid_man_debug
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};