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ttm_bo_manager.c revision 1.4 
      1 /*	$NetBSD: ttm_bo_manager.c,v 1.4 2020/02/14 14:34:59 maya Exp $	*/
      2 
      3 /**************************************************************************
      4  *
      5  * Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA
      6  * All Rights Reserved.
      7  *
      8  * Permission is hereby granted, free of charge, to any person obtaining a
      9  * copy of this software and associated documentation files (the
     10  * "Software"), to deal in the Software without restriction, including
     11  * without limitation the rights to use, copy, modify, merge, publish,
     12  * distribute, sub license, and/or sell copies of the Software, and to
     13  * permit persons to whom the Software is furnished to do so, subject to
     14  * the following conditions:
     15  *
     16  * The above copyright notice and this permission notice (including the
     17  * next paragraph) shall be included in all copies or substantial portions
     18  * of the Software.
     19  *
     20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     22  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
     23  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
     24  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
     25  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
     26  * USE OR OTHER DEALINGS IN THE SOFTWARE.
     27  *
     28  **************************************************************************/
     29 /*
     30  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
     31  */
     32 
     33 #include <sys/cdefs.h>
     34 __KERNEL_RCSID(0, "$NetBSD: ttm_bo_manager.c,v 1.4 2020/02/14 14:34:59 maya Exp $");
     35 
     36 #include <drm/ttm/ttm_module.h>
     37 #include <drm/ttm/ttm_bo_driver.h>
     38 #include <drm/ttm/ttm_placement.h>
     39 #include <drm/drm_mm.h>
     40 #include <linux/slab.h>
     41 #include <linux/spinlock.h>
     42 #include <linux/module.h>
     43 
     44 /**
     45  * Currently we use a spinlock for the lock, but a mutex *may* be
     46  * more appropriate to reduce scheduling latency if the range manager
     47  * ends up with very fragmented allocation patterns.
     48  */
     49 
     50 struct ttm_range_manager {
     51 	struct drm_mm mm;
     52 	spinlock_t lock;
     53 };
     54 
     55 static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
     56 			       struct ttm_buffer_object *bo,
     57 			       const struct ttm_place *place,
     58 			       struct ttm_mem_reg *mem)
     59 {
     60 	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
     61 	struct drm_mm *mm = &rman->mm;
     62 	struct drm_mm_node *node = NULL;
     63 	enum drm_mm_search_flags sflags = DRM_MM_SEARCH_BEST;
     64 	enum drm_mm_allocator_flags aflags = DRM_MM_CREATE_DEFAULT;
     65 	unsigned long lpfn;
     66 	int ret;
     67 
     68 	lpfn = place->lpfn;
     69 	if (!lpfn)
     70 		lpfn = man->size;
     71 
     72 	node = kzalloc(sizeof(*node), GFP_KERNEL);
     73 	if (!node)
     74 		return -ENOMEM;
     75 
     76 	if (place->flags & TTM_PL_FLAG_TOPDOWN) {
     77 		sflags = DRM_MM_SEARCH_BELOW;
     78 		aflags = DRM_MM_CREATE_TOP;
     79 	}
     80 
     81 	spin_lock(&rman->lock);
     82 	ret = drm_mm_insert_node_in_range_generic(mm, node, mem->num_pages,
     83 					  mem->page_alignment, 0,
     84 					  place->fpfn, lpfn,
     85 					  sflags, aflags);
     86 	spin_unlock(&rman->lock);
     87 
     88 	if (unlikely(ret)) {
     89 		kfree(node);
     90 	} else {
     91 		mem->mm_node = node;
     92 		mem->start = node->start;
     93 	}
     94 
     95 	return 0;
     96 }
     97 
     98 static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
     99 				struct ttm_mem_reg *mem)
    100 {
    101 	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
    102 
    103 	if (mem->mm_node) {
    104 		spin_lock(&rman->lock);
    105 		drm_mm_remove_node(mem->mm_node);
    106 		spin_unlock(&rman->lock);
    107 
    108 		kfree(mem->mm_node);
    109 		mem->mm_node = NULL;
    110 	}
    111 }
    112 
    113 static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
    114 			   unsigned long p_size)
    115 {
    116 	struct ttm_range_manager *rman;
    117 
    118 	rman = kzalloc(sizeof(*rman), GFP_KERNEL);
    119 	if (!rman)
    120 		return -ENOMEM;
    121 
    122 	drm_mm_init(&rman->mm, 0, p_size);
    123 	spin_lock_init(&rman->lock);
    124 	man->priv = rman;
    125 	return 0;
    126 }
    127 
    128 static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
    129 {
    130 	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
    131 	struct drm_mm *mm = &rman->mm;
    132 
    133 	spin_lock(&rman->lock);
    134 	if (drm_mm_clean(mm)) {
    135 		drm_mm_takedown(mm);
    136 		spin_unlock(&rman->lock);
    137 		kfree(rman);
    138 		man->priv = NULL;
    139 		return 0;
    140 	}
    141 	spin_unlock(&rman->lock);
    142 	return -EBUSY;
    143 }
    144 
    145 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
    146 			     const char *prefix)
    147 {
    148 	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
    149 
    150 	spin_lock(&rman->lock);
    151 	drm_mm_debug_table(&rman->mm, prefix);
    152 	spin_unlock(&rman->lock);
    153 }
    154 
    155 const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
    156 	ttm_bo_man_init,
    157 	ttm_bo_man_takedown,
    158 	ttm_bo_man_get_node,
    159 	ttm_bo_man_put_node,
    160 	ttm_bo_man_debug
    161 };
    162 EXPORT_SYMBOL(ttm_bo_manager_func);
    163