138 lines
3.6 KiB
C
138 lines
3.6 KiB
C
/**************************************************************************
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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 <thellstrom-at-vmware-dot-com>
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*/
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#include "vmwgfx_drv.h"
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#include "ttm/ttm_module.h"
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#include "ttm/ttm_bo_driver.h"
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#include "ttm/ttm_placement.h"
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#include <linux/idr.h>
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#include <linux/spinlock.h>
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#include <linux/kernel.h>
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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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};
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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;
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int id;
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mem->mm_node = NULL;
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do {
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if (unlikely(ida_pre_get(&gman->gmr_ida, GFP_KERNEL) == 0))
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return -ENOMEM;
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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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spin_unlock(&gman->lock);
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return 0;
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}
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spin_unlock(&gman->lock);
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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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}
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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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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 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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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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{
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struct vmwgfx_gmrid_man *gman =
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(struct vmwgfx_gmrid_man *)man->priv;
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if (gman) {
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ida_destroy(&gman->gmr_ida);
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kfree(gman);
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}
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return 0;
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}
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static void vmw_gmrid_man_debug(struct ttm_mem_type_manager *man,
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const char *prefix)
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{
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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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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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};
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