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 	spinlock_t lock;
41 	struct ida gmr_ida;
42 	uint32_t max_gmr_ids;
43 	uint32_t max_gmr_pages;
44 	uint32_t used_gmr_pages;
45 };
46 
47 static int vmw_gmrid_man_get_node(struct ttm_mem_type_manager *man,
48 				  struct ttm_buffer_object *bo,
49 				  const struct ttm_place *place,
50 				  struct ttm_mem_reg *mem)
51 {
52 	struct vmwgfx_gmrid_man *gman =
53 		(struct vmwgfx_gmrid_man *)man->priv;
54 	int id;
55 
56 	mem->mm_node = NULL;
57 
58 	id = ida_alloc_max(&gman->gmr_ida, gman->max_gmr_ids - 1, GFP_KERNEL);
59 	if (id < 0)
60 		return (id != -ENOMEM ? 0 : id);
61 
62 	spin_lock(&gman->lock);
63 
64 	if (gman->max_gmr_pages > 0) {
65 		gman->used_gmr_pages += bo->num_pages;
66 		if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages))
67 			goto nospace;
68 	}
69 
70 	mem->mm_node = gman;
71 	mem->start = id;
72 	mem->num_pages = bo->num_pages;
73 
74 	spin_unlock(&gman->lock);
75 	return 0;
76 
77 nospace:
78 	gman->used_gmr_pages -= bo->num_pages;
79 	spin_unlock(&gman->lock);
80 	ida_free(&gman->gmr_ida, id);
81 	return 0;
82 }
83 
84 static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man,
85 				   struct ttm_mem_reg *mem)
86 {
87 	struct vmwgfx_gmrid_man *gman =
88 		(struct vmwgfx_gmrid_man *)man->priv;
89 
90 	if (mem->mm_node) {
91 		ida_free(&gman->gmr_ida, mem->start);
92 		spin_lock(&gman->lock);
93 		gman->used_gmr_pages -= mem->num_pages;
94 		spin_unlock(&gman->lock);
95 		mem->mm_node = NULL;
96 	}
97 }
98 
99 static int vmw_gmrid_man_init(struct ttm_mem_type_manager *man,
100 			      unsigned long p_size)
101 {
102 	struct vmw_private *dev_priv =
103 		container_of(man->bdev, struct vmw_private, bdev);
104 	struct vmwgfx_gmrid_man *gman =
105 		kzalloc(sizeof(*gman), GFP_KERNEL);
106 
107 	if (unlikely(!gman))
108 		return -ENOMEM;
109 
110 	spin_lock_init(&gman->lock);
111 	gman->used_gmr_pages = 0;
112 	ida_init(&gman->gmr_ida);
113 
114 	switch (p_size) {
115 	case VMW_PL_GMR:
116 		gman->max_gmr_ids = dev_priv->max_gmr_ids;
117 		gman->max_gmr_pages = dev_priv->max_gmr_pages;
118 		break;
119 	case VMW_PL_MOB:
120 		gman->max_gmr_ids = VMWGFX_NUM_MOB;
121 		gman->max_gmr_pages = dev_priv->max_mob_pages;
122 		break;
123 	default:
124 		BUG();
125 	}
126 	man->priv = (void *) gman;
127 	return 0;
128 }
129 
130 static int vmw_gmrid_man_takedown(struct ttm_mem_type_manager *man)
131 {
132 	struct vmwgfx_gmrid_man *gman =
133 		(struct vmwgfx_gmrid_man *)man->priv;
134 
135 	if (gman) {
136 		ida_destroy(&gman->gmr_ida);
137 		kfree(gman);
138 	}
139 	return 0;
140 }
141 
142 static void vmw_gmrid_man_debug(struct ttm_mem_type_manager *man,
143 				struct drm_printer *printer)
144 {
145 	drm_printf(printer, "No debug info available for the GMR id manager\n");
146 }
147 
148 const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = {
149 	.init = vmw_gmrid_man_init,
150 	.takedown = vmw_gmrid_man_takedown,
151 	.get_node = vmw_gmrid_man_get_node,
152 	.put_node = vmw_gmrid_man_put_node,
153 	.debug = vmw_gmrid_man_debug
154 };
155