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      1 /*	$NetBSD: ttm_bo_manager.c,v 1.6 2021/12/19 12:37:43 riastradh Exp $	*/
      2 
      3 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
      4 /**************************************************************************
      5  *
      6  * Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA
      7  * All Rights Reserved.
      8  *
      9  * Permission is hereby granted, free of charge, to any person obtaining a
     10  * copy of this software and associated documentation files (the
     11  * "Software"), to deal in the Software without restriction, including
     12  * without limitation the rights to use, copy, modify, merge, publish,
     13  * distribute, sub license, and/or sell copies of the Software, and to
     14  * permit persons to whom the Software is furnished to do so, subject to
     15  * the following conditions:
     16  *
     17  * The above copyright notice and this permission notice (including the
     18  * next paragraph) shall be included in all copies or substantial portions
     19  * of the Software.
     20  *
     21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     22  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     23  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
     24  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
     25  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
     26  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
     27  * USE OR OTHER DEALINGS IN THE SOFTWARE.
     28  *
     29  **************************************************************************/
     30 /*
     31  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
     32  */
     33 
     34 #include <sys/cdefs.h>
     35 __KERNEL_RCSID(0, "$NetBSD: ttm_bo_manager.c,v 1.6 2021/12/19 12:37:43 riastradh Exp $");
     36 
     37 #include <drm/ttm/ttm_module.h>
     38 #include <drm/ttm/ttm_bo_driver.h>
     39 #include <drm/ttm/ttm_placement.h>
     40 #include <drm/drm_mm.h>
     41 #include <linux/slab.h>
     42 #include <linux/spinlock.h>
     43 #include <linux/module.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;
     64 	enum drm_mm_insert_mode mode;
     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 	mode = DRM_MM_INSERT_BEST;
     77 	if (place->flags & TTM_PL_FLAG_TOPDOWN)
     78 		mode = DRM_MM_INSERT_HIGH;
     79 
     80 	spin_lock(&rman->lock);
     81 	ret = drm_mm_insert_node_in_range(mm, node,
     82 					  mem->num_pages,
     83 					  mem->page_alignment, 0,
     84 					  place->fpfn, lpfn, mode);
     85 	spin_unlock(&rman->lock);
     86 
     87 	if (unlikely(ret)) {
     88 		kfree(node);
     89 	} else {
     90 		mem->mm_node = node;
     91 		mem->start = node->start;
     92 	}
     93 
     94 	return 0;
     95 }
     96 
     97 static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
     98 				struct ttm_mem_reg *mem)
     99 {
    100 	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
    101 
    102 	if (mem->mm_node) {
    103 		spin_lock(&rman->lock);
    104 		drm_mm_remove_node(mem->mm_node);
    105 		spin_unlock(&rman->lock);
    106 
    107 		kfree(mem->mm_node);
    108 		mem->mm_node = NULL;
    109 	}
    110 }
    111 
    112 static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
    113 			   unsigned long p_size)
    114 {
    115 	struct ttm_range_manager *rman;
    116 
    117 	rman = kzalloc(sizeof(*rman), GFP_KERNEL);
    118 	if (!rman)
    119 		return -ENOMEM;
    120 
    121 	drm_mm_init(&rman->mm, 0, p_size);
    122 	spin_lock_init(&rman->lock);
    123 	man->priv = rman;
    124 	return 0;
    125 }
    126 
    127 static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
    128 {
    129 	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
    130 	struct drm_mm *mm = &rman->mm;
    131 
    132 	spin_lock(&rman->lock);
    133 	if (drm_mm_clean(mm)) {
    134 		drm_mm_takedown(mm);
    135 		spin_unlock(&rman->lock);
    136 		spin_lock_destroy(&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 			     struct drm_printer *printer)
    147 {
    148 	struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
    149 
    150 	spin_lock(&rman->lock);
    151 	drm_mm_print(&rman->mm, printer);
    152 	spin_unlock(&rman->lock);
    153 }
    154 
    155 const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
    156 	.init = ttm_bo_man_init,
    157 	.takedown = ttm_bo_man_takedown,
    158 	.get_node = ttm_bo_man_get_node,
    159 	.put_node = ttm_bo_man_put_node,
    160 	.debug = ttm_bo_man_debug
    161 };
    162 EXPORT_SYMBOL(ttm_bo_manager_func);
    163