forked from KolibriOS/kolibrios
151 lines
4.1 KiB
C
151 lines
4.1 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 <drm/ttm/ttm_module.h>
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#include <drm/ttm/ttm_bo_driver.h>
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#include <drm/ttm/ttm_placement.h>
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#include <drm/drm_mm.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/module.h>
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/**
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* Currently we use a spinlock for the lock, but a mutex *may* be
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* more appropriate to reduce scheduling latency if the range manager
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* ends up with very fragmented allocation patterns.
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*/
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struct ttm_range_manager {
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struct drm_mm mm;
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spinlock_t lock;
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};
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static int ttm_bo_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 ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
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struct drm_mm *mm = &rman->mm;
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struct drm_mm_node *node = NULL;
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unsigned long lpfn;
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int ret;
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lpfn = placement->lpfn;
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if (!lpfn)
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lpfn = man->size;
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node = kzalloc(sizeof(*node), GFP_KERNEL);
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if (!node)
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return -ENOMEM;
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spin_lock(&rman->lock);
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ret = drm_mm_insert_node_in_range(mm, node, mem->num_pages,
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mem->page_alignment,
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placement->fpfn, lpfn,
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DRM_MM_SEARCH_BEST);
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spin_unlock(&rman->lock);
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if (unlikely(ret)) {
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kfree(node);
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} else {
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mem->mm_node = node;
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mem->start = node->start;
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}
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return 0;
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}
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static void ttm_bo_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 ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
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if (mem->mm_node) {
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spin_lock(&rman->lock);
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drm_mm_remove_node(mem->mm_node);
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spin_unlock(&rman->lock);
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kfree(mem->mm_node);
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mem->mm_node = NULL;
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}
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}
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static int ttm_bo_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 ttm_range_manager *rman;
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rman = kzalloc(sizeof(*rman), GFP_KERNEL);
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if (!rman)
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return -ENOMEM;
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drm_mm_init(&rman->mm, 0, p_size);
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spin_lock_init(&rman->lock);
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man->priv = rman;
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return 0;
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}
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static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
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{
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struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
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struct drm_mm *mm = &rman->mm;
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spin_lock(&rman->lock);
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if (drm_mm_clean(mm)) {
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drm_mm_takedown(mm);
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spin_unlock(&rman->lock);
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kfree(rman);
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man->priv = NULL;
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return 0;
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}
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spin_unlock(&rman->lock);
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return -EBUSY;
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}
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static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
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const char *prefix)
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{
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struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
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spin_lock(&rman->lock);
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drm_mm_debug_table(&rman->mm, prefix);
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spin_unlock(&rman->lock);
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}
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const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
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ttm_bo_man_init,
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ttm_bo_man_takedown,
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ttm_bo_man_get_node,
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ttm_bo_man_put_node,
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ttm_bo_man_debug
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};
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EXPORT_SYMBOL(ttm_bo_manager_func);
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