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ttm_bo_manager.c revision 1.3 
      1 /*	$NetBSD: ttm_bo_manager.c,v 1.3 2018/08/27 04:58:37 riastradh 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 1.3 2018/08/27 04:58:37 riastradh 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 #include <linux/export.h>
     44 
     45 /**
     46  * Currently we use a spinlock for the lock, but a mutex *may* be
     47  * more appropriate to reduce scheduling latency if the range manager
     48  * ends up with very fragmented allocation patterns.
     49  */
     50 
     51 struct ttm_range_manager {
     52 	struct drm_mm mm;
     53 	spinlock_t lock;
     54 };
     55 
     56 static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
     57 			       struct ttm_buffer_object *bo,
     58 			       const struct ttm_place *place,
     59 			       struct ttm_mem_reg *mem)
     60 {
     61 	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
     62 	struct drm_mm *mm = &rman->mm;
     63 	struct drm_mm_node *node = NULL;
     64 	enum drm_mm_search_flags sflags = DRM_MM_SEARCH_BEST;
     65 	enum drm_mm_allocator_flags aflags = DRM_MM_CREATE_DEFAULT;
     66 	unsigned long lpfn;
     67 	int ret;
     68 
     69 	lpfn = place->lpfn;
     70 	if (!lpfn)
     71 		lpfn = man->size;
     72 
     73 	node = kzalloc(sizeof(*node), GFP_KERNEL);
     74 	if (!node)
     75 		return -ENOMEM;
     76 
     77 	if (place->flags & TTM_PL_FLAG_TOPDOWN) {
     78 		sflags = DRM_MM_SEARCH_BELOW;
     79 		aflags = DRM_MM_CREATE_TOP;
     80 	}
     81 
     82 	spin_lock(&rman->lock);
     83 	ret = drm_mm_insert_node_in_range_generic(mm, node, mem->num_pages,
     84 					  mem->page_alignment, 0,
     85 					  place->fpfn, lpfn,
     86 					  sflags, aflags);
     87 	spin_unlock(&rman->lock);
     88 
     89 	if (unlikely(ret)) {
     90 		kfree(node);
     91 	} else {
     92 		mem->mm_node = node;
     93 		mem->start = node->start;
     94 	}
     95 
     96 	return 0;
     97 }
     98 
     99 static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
    100 				struct ttm_mem_reg *mem)
    101 {
    102 	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
    103 
    104 	if (mem->mm_node) {
    105 		spin_lock(&rman->lock);
    106 		drm_mm_remove_node(mem->mm_node);
    107 		spin_unlock(&rman->lock);
    108 
    109 		kfree(mem->mm_node);
    110 		mem->mm_node = NULL;
    111 	}
    112 }
    113 
    114 static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
    115 			   unsigned long p_size)
    116 {
    117 	struct ttm_range_manager *rman;
    118 
    119 	rman = kzalloc(sizeof(*rman), GFP_KERNEL);
    120 	if (!rman)
    121 		return -ENOMEM;
    122 
    123 	drm_mm_init(&rman->mm, 0, p_size);
    124 	spin_lock_init(&rman->lock);
    125 	man->priv = rman;
    126 	return 0;
    127 }
    128 
    129 static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
    130 {
    131 	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
    132 	struct drm_mm *mm = &rman->mm;
    133 
    134 	spin_lock(&rman->lock);
    135 	if (drm_mm_clean(mm)) {
    136 		drm_mm_takedown(mm);
    137 		spin_unlock(&rman->lock);
    138 		kfree(rman);
    139 		man->priv = NULL;
    140 		return 0;
    141 	}
    142 	spin_unlock(&rman->lock);
    143 	return -EBUSY;
    144 }
    145 
    146 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
    147 			     const char *prefix)
    148 {
    149 	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
    150 
    151 	spin_lock(&rman->lock);
    152 	drm_mm_debug_table(&rman->mm, prefix);
    153 	spin_unlock(&rman->lock);
    154 }
    155 
    156 const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
    157 	ttm_bo_man_init,
    158 	ttm_bo_man_takedown,
    159 	ttm_bo_man_get_node,
    160 	ttm_bo_man_put_node,
    161 	ttm_bo_man_debug
    162 };
    163 EXPORT_SYMBOL(ttm_bo_manager_func);
    164