1 // SPDX-License-Identifier: GPL-2.0 OR MIT
2 /**************************************************************************
3  *
4  * Copyright 2007-2010 VMware, Inc., Palo Alto, CA., USA
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the
8  * "Software"), to deal in the Software without restriction, including
9  * without limitation the rights to use, copy, modify, merge, publish,
10  * distribute, sub license, and/or sell copies of the Software, and to
11  * permit persons to whom the Software is furnished to do so, subject to
12  * the following conditions:
13  *
14  * The above copyright notice and this permission notice (including the
15  * next paragraph) shall be included in all copies or substantial portions
16  * of the Software.
17  *
18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
25  *
26  **************************************************************************/
27 /*
28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
29  */
30 
31 #include "vmwgfx_drv.h"
32 #include <drm/ttm/ttm_module.h>
33 #include <drm/ttm/ttm_bo_driver.h>
34 #include <drm/ttm/ttm_placement.h>
35 #include <linux/idr.h>
36 #include <linux/spinlock.h>
37 #include <linux/kernel.h>
38 
39 struct vmwgfx_gmrid_man {
40 	struct ttm_resource_manager manager;
41 	spinlock_t lock;
42 	struct ida gmr_ida;
43 	uint32_t max_gmr_ids;
44 	uint32_t max_gmr_pages;
45 	uint32_t used_gmr_pages;
46 };
47 
48 static struct vmwgfx_gmrid_man *to_gmrid_manager(struct ttm_resource_manager *man)
49 {
50 	return container_of(man, struct vmwgfx_gmrid_man, manager);
51 }
52 
53 static int vmw_gmrid_man_get_node(struct ttm_resource_manager *man,
54 				  struct ttm_buffer_object *bo,
55 				  const struct ttm_place *place,
56 				  struct ttm_resource *mem)
57 {
58 	struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
59 	int id;
60 
61 	id = ida_alloc_max(&gman->gmr_ida, gman->max_gmr_ids - 1, GFP_KERNEL);
62 	if (id < 0)
63 		return (id != -ENOMEM ? 0 : id);
64 
65 	spin_lock(&gman->lock);
66 
67 	if (gman->max_gmr_pages > 0) {
68 		gman->used_gmr_pages += bo->num_pages;
69 		if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages))
70 			goto nospace;
71 	}
72 
73 	mem->mm_node = gman;
74 	mem->start = id;
75 	mem->num_pages = bo->num_pages;
76 
77 	spin_unlock(&gman->lock);
78 	return 0;
79 
80 nospace:
81 	gman->used_gmr_pages -= bo->num_pages;
82 	spin_unlock(&gman->lock);
83 	ida_free(&gman->gmr_ida, id);
84 	return -ENOSPC;
85 }
86 
87 static void vmw_gmrid_man_put_node(struct ttm_resource_manager *man,
88 				   struct ttm_resource *mem)
89 {
90 	struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
91 
92 	if (mem->mm_node) {
93 		ida_free(&gman->gmr_ida, mem->start);
94 		spin_lock(&gman->lock);
95 		gman->used_gmr_pages -= mem->num_pages;
96 		spin_unlock(&gman->lock);
97 		mem->mm_node = NULL;
98 	}
99 }
100 
101 static const struct ttm_resource_manager_func vmw_gmrid_manager_func;
102 
103 int vmw_gmrid_man_init(struct vmw_private *dev_priv, int type)
104 {
105 	struct ttm_resource_manager *man;
106 	struct vmwgfx_gmrid_man *gman =
107 		kzalloc(sizeof(*gman), GFP_KERNEL);
108 
109 	if (unlikely(!gman))
110 		return -ENOMEM;
111 
112 	man = &gman->manager;
113 
114 	man->func = &vmw_gmrid_manager_func;
115 	man->available_caching = TTM_PL_FLAG_CACHED;
116 	man->default_caching = TTM_PL_FLAG_CACHED;
117 	/* TODO: This is most likely not correct */
118 	man->use_tt = true;
119 	ttm_resource_manager_init(man, 0);
120 	spin_lock_init(&gman->lock);
121 	gman->used_gmr_pages = 0;
122 	ida_init(&gman->gmr_ida);
123 
124 	switch (type) {
125 	case VMW_PL_GMR:
126 		gman->max_gmr_ids = dev_priv->max_gmr_ids;
127 		gman->max_gmr_pages = dev_priv->max_gmr_pages;
128 		break;
129 	case VMW_PL_MOB:
130 		gman->max_gmr_ids = VMWGFX_NUM_MOB;
131 		gman->max_gmr_pages = dev_priv->max_mob_pages;
132 		break;
133 	default:
134 		BUG();
135 	}
136 	ttm_set_driver_manager(&dev_priv->bdev, type, &gman->manager);
137 	ttm_resource_manager_set_used(man, true);
138 	return 0;
139 }
140 
141 void vmw_gmrid_man_fini(struct vmw_private *dev_priv, int type)
142 {
143 	struct ttm_resource_manager *man = ttm_manager_type(&dev_priv->bdev, type);
144 	struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
145 
146 	ttm_resource_manager_set_used(man, false);
147 
148 	ttm_resource_manager_force_list_clean(&dev_priv->bdev, man);
149 
150 	ttm_resource_manager_cleanup(man);
151 
152 	ttm_set_driver_manager(&dev_priv->bdev, type, NULL);
153 	ida_destroy(&gman->gmr_ida);
154 	kfree(gman);
155 
156 }
157 
158 static const struct ttm_resource_manager_func vmw_gmrid_manager_func = {
159 	.alloc = vmw_gmrid_man_get_node,
160 	.free = vmw_gmrid_man_put_node,
161 };
162