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_bo_driver.h>
33 #include <drm/ttm/ttm_placement.h>
34 #include <linux/idr.h>
35 #include <linux/spinlock.h>
36 #include <linux/kernel.h>
37
38 struct vmwgfx_gmrid_man {
39 struct ttm_resource_manager manager;
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 uint8_t type;
46 };
47
to_gmrid_manager(struct ttm_resource_manager * man)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
vmw_gmrid_man_get_node(struct ttm_resource_manager * man,struct ttm_buffer_object * bo,const struct ttm_place * place,struct ttm_resource ** res)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 **res)
57 {
58 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
59 int id;
60
61 *res = kmalloc(sizeof(**res), GFP_KERNEL);
62 if (!*res)
63 return -ENOMEM;
64
65 ttm_resource_init(bo, place, *res);
66
67 id = ida_alloc_max(&gman->gmr_ida, gman->max_gmr_ids - 1, GFP_KERNEL);
68 if (id < 0)
69 return id;
70
71 spin_lock(&gman->lock);
72
73 if (gman->max_gmr_pages > 0) {
74 gman->used_gmr_pages += (*res)->num_pages;
75 /*
76 * Because the graphics memory is a soft limit we can try to
77 * expand it instead of letting the userspace apps crash.
78 * We're just going to have a sane limit (half of RAM)
79 * on the number of MOB's that we create and will try to keep
80 * the system running until we reach that.
81 */
82 if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages)) {
83 const unsigned long max_graphics_pages = totalram_pages() / 2;
84 uint32_t new_max_pages = 0;
85
86 DRM_WARN("vmwgfx: mob memory overflow. Consider increasing guest RAM and graphicsMemory.\n");
87 vmw_host_printf("vmwgfx, warning: mob memory overflow. Consider increasing guest RAM and graphicsMemory.\n");
88
89 if (gman->max_gmr_pages > (max_graphics_pages / 2)) {
90 DRM_WARN("vmwgfx: guest requires more than half of RAM for graphics.\n");
91 new_max_pages = max_graphics_pages;
92 } else
93 new_max_pages = gman->max_gmr_pages * 2;
94 if (new_max_pages > gman->max_gmr_pages && new_max_pages >= gman->used_gmr_pages) {
95 DRM_WARN("vmwgfx: increasing guest mob limits to %u kB.\n",
96 ((new_max_pages) << (PAGE_SHIFT - 10)));
97
98 gman->max_gmr_pages = new_max_pages;
99 } else {
100 char buf[256];
101 snprintf(buf, sizeof(buf),
102 "vmwgfx, error: guest graphics is out of memory (mob limit at: %ukB).\n",
103 ((gman->max_gmr_pages) << (PAGE_SHIFT - 10)));
104 vmw_host_printf(buf);
105 DRM_WARN("%s", buf);
106 goto nospace;
107 }
108 }
109 }
110
111 (*res)->start = id;
112
113 spin_unlock(&gman->lock);
114 return 0;
115
116 nospace:
117 gman->used_gmr_pages -= (*res)->num_pages;
118 spin_unlock(&gman->lock);
119 ida_free(&gman->gmr_ida, id);
120 ttm_resource_fini(man, *res);
121 kfree(*res);
122 return -ENOSPC;
123 }
124
vmw_gmrid_man_put_node(struct ttm_resource_manager * man,struct ttm_resource * res)125 static void vmw_gmrid_man_put_node(struct ttm_resource_manager *man,
126 struct ttm_resource *res)
127 {
128 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
129
130 ida_free(&gman->gmr_ida, res->start);
131 spin_lock(&gman->lock);
132 gman->used_gmr_pages -= res->num_pages;
133 spin_unlock(&gman->lock);
134 ttm_resource_fini(man, res);
135 kfree(res);
136 }
137
vmw_gmrid_man_debug(struct ttm_resource_manager * man,struct drm_printer * printer)138 static void vmw_gmrid_man_debug(struct ttm_resource_manager *man,
139 struct drm_printer *printer)
140 {
141 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
142
143 BUG_ON(gman->type != VMW_PL_GMR && gman->type != VMW_PL_MOB);
144
145 drm_printf(printer, "%s's used: %u pages, max: %u pages, %u id's\n",
146 (gman->type == VMW_PL_MOB) ? "Mob" : "GMR",
147 gman->used_gmr_pages, gman->max_gmr_pages, gman->max_gmr_ids);
148 }
149
150 static const struct ttm_resource_manager_func vmw_gmrid_manager_func;
151
vmw_gmrid_man_init(struct vmw_private * dev_priv,int type)152 int vmw_gmrid_man_init(struct vmw_private *dev_priv, int type)
153 {
154 struct ttm_resource_manager *man;
155 struct vmwgfx_gmrid_man *gman =
156 kzalloc(sizeof(*gman), GFP_KERNEL);
157
158 if (unlikely(!gman))
159 return -ENOMEM;
160
161 man = &gman->manager;
162
163 man->func = &vmw_gmrid_manager_func;
164 man->use_tt = true;
165 ttm_resource_manager_init(man, &dev_priv->bdev, 0);
166 spin_lock_init(&gman->lock);
167 gman->used_gmr_pages = 0;
168 ida_init(&gman->gmr_ida);
169 gman->type = type;
170
171 switch (type) {
172 case VMW_PL_GMR:
173 gman->max_gmr_ids = dev_priv->max_gmr_ids;
174 gman->max_gmr_pages = dev_priv->max_gmr_pages;
175 break;
176 case VMW_PL_MOB:
177 gman->max_gmr_ids = VMWGFX_NUM_MOB;
178 gman->max_gmr_pages = dev_priv->max_mob_pages;
179 break;
180 default:
181 BUG();
182 }
183 ttm_set_driver_manager(&dev_priv->bdev, type, &gman->manager);
184 ttm_resource_manager_set_used(man, true);
185 return 0;
186 }
187
vmw_gmrid_man_fini(struct vmw_private * dev_priv,int type)188 void vmw_gmrid_man_fini(struct vmw_private *dev_priv, int type)
189 {
190 struct ttm_resource_manager *man = ttm_manager_type(&dev_priv->bdev, type);
191 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
192
193 ttm_resource_manager_set_used(man, false);
194
195 ttm_resource_manager_evict_all(&dev_priv->bdev, man);
196
197 ttm_resource_manager_cleanup(man);
198
199 ttm_set_driver_manager(&dev_priv->bdev, type, NULL);
200 ida_destroy(&gman->gmr_ida);
201 kfree(gman);
202
203 }
204
205 static const struct ttm_resource_manager_func vmw_gmrid_manager_func = {
206 .alloc = vmw_gmrid_man_get_node,
207 .free = vmw_gmrid_man_put_node,
208 .debug = vmw_gmrid_man_debug
209 };
210