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_placement.h>
33 #include <linux/idr.h>
34 #include <linux/spinlock.h>
35 #include <linux/kernel.h>
36
37 struct vmwgfx_gmrid_man {
38 struct ttm_resource_manager manager;
39 spinlock_t lock;
40 struct ida gmr_ida;
41 uint32_t max_gmr_ids;
42 uint32_t max_gmr_pages;
43 uint32_t used_gmr_pages;
44 uint8_t type;
45 };
46
to_gmrid_manager(struct ttm_resource_manager * man)47 static struct vmwgfx_gmrid_man *to_gmrid_manager(struct ttm_resource_manager *man)
48 {
49 return container_of(man, struct vmwgfx_gmrid_man, manager);
50 }
51
vmw_gmrid_man_get_node(struct ttm_resource_manager * man,struct ttm_buffer_object * bo,const struct ttm_place * place,struct ttm_resource ** res)52 static int vmw_gmrid_man_get_node(struct ttm_resource_manager *man,
53 struct ttm_buffer_object *bo,
54 const struct ttm_place *place,
55 struct ttm_resource **res)
56 {
57 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
58 int id;
59
60 *res = kmalloc(sizeof(**res), GFP_KERNEL);
61 if (!*res)
62 return -ENOMEM;
63
64 ttm_resource_init(bo, place, *res);
65
66 id = ida_alloc_max(&gman->gmr_ida, gman->max_gmr_ids - 1, GFP_KERNEL);
67 if (id < 0)
68 return id;
69
70 spin_lock(&gman->lock);
71
72 if (gman->max_gmr_pages > 0) {
73 gman->used_gmr_pages += PFN_UP((*res)->size);
74 /*
75 * Because the graphics memory is a soft limit we can try to
76 * expand it instead of letting the userspace apps crash.
77 * We're just going to have a sane limit (half of RAM)
78 * on the number of MOB's that we create and will try to keep
79 * the system running until we reach that.
80 */
81 if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages)) {
82 const unsigned long max_graphics_pages = totalram_pages() / 2;
83 uint32_t new_max_pages = 0;
84
85 DRM_WARN("vmwgfx: mob memory overflow. Consider increasing guest RAM and graphicsMemory.\n");
86 vmw_host_printf("vmwgfx, warning: mob memory overflow. Consider increasing guest RAM and graphicsMemory.\n");
87
88 if (gman->max_gmr_pages > (max_graphics_pages / 2)) {
89 DRM_WARN("vmwgfx: guest requires more than half of RAM for graphics.\n");
90 new_max_pages = max_graphics_pages;
91 } else
92 new_max_pages = gman->max_gmr_pages * 2;
93 if (new_max_pages > gman->max_gmr_pages && new_max_pages >= gman->used_gmr_pages) {
94 DRM_WARN("vmwgfx: increasing guest mob limits to %u kB.\n",
95 ((new_max_pages) << (PAGE_SHIFT - 10)));
96
97 gman->max_gmr_pages = new_max_pages;
98 } else {
99 char buf[256];
100 snprintf(buf, sizeof(buf),
101 "vmwgfx, error: guest graphics is out of memory (mob limit at: %ukB).\n",
102 ((gman->max_gmr_pages) << (PAGE_SHIFT - 10)));
103 vmw_host_printf(buf);
104 DRM_WARN("%s", buf);
105 goto nospace;
106 }
107 }
108 }
109
110 (*res)->start = id;
111
112 spin_unlock(&gman->lock);
113 return 0;
114
115 nospace:
116 gman->used_gmr_pages -= PFN_UP((*res)->size);
117 spin_unlock(&gman->lock);
118 ida_free(&gman->gmr_ida, id);
119 ttm_resource_fini(man, *res);
120 kfree(*res);
121 return -ENOSPC;
122 }
123
vmw_gmrid_man_put_node(struct ttm_resource_manager * man,struct ttm_resource * res)124 static void vmw_gmrid_man_put_node(struct ttm_resource_manager *man,
125 struct ttm_resource *res)
126 {
127 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
128
129 ida_free(&gman->gmr_ida, res->start);
130 spin_lock(&gman->lock);
131 gman->used_gmr_pages -= PFN_UP(res->size);
132 spin_unlock(&gman->lock);
133 ttm_resource_fini(man, res);
134 kfree(res);
135 }
136
vmw_gmrid_man_debug(struct ttm_resource_manager * man,struct drm_printer * printer)137 static void vmw_gmrid_man_debug(struct ttm_resource_manager *man,
138 struct drm_printer *printer)
139 {
140 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
141
142 BUG_ON(gman->type != VMW_PL_GMR && gman->type != VMW_PL_MOB);
143
144 drm_printf(printer, "%s's used: %u pages, max: %u pages, %u id's\n",
145 (gman->type == VMW_PL_MOB) ? "Mob" : "GMR",
146 gman->used_gmr_pages, gman->max_gmr_pages, gman->max_gmr_ids);
147 }
148
149 static const struct ttm_resource_manager_func vmw_gmrid_manager_func;
150
vmw_gmrid_man_init(struct vmw_private * dev_priv,int type)151 int vmw_gmrid_man_init(struct vmw_private *dev_priv, int type)
152 {
153 struct ttm_resource_manager *man;
154 struct vmwgfx_gmrid_man *gman =
155 kzalloc(sizeof(*gman), GFP_KERNEL);
156
157 if (unlikely(!gman))
158 return -ENOMEM;
159
160 man = &gman->manager;
161
162 man->func = &vmw_gmrid_manager_func;
163 man->use_tt = true;
164 ttm_resource_manager_init(man, &dev_priv->bdev, 0);
165 spin_lock_init(&gman->lock);
166 gman->used_gmr_pages = 0;
167 ida_init(&gman->gmr_ida);
168 gman->type = type;
169
170 switch (type) {
171 case VMW_PL_GMR:
172 gman->max_gmr_ids = dev_priv->max_gmr_ids;
173 gman->max_gmr_pages = dev_priv->max_gmr_pages;
174 break;
175 case VMW_PL_MOB:
176 gman->max_gmr_ids = VMWGFX_NUM_MOB;
177 gman->max_gmr_pages = dev_priv->max_mob_pages;
178 break;
179 default:
180 BUG();
181 }
182 ttm_set_driver_manager(&dev_priv->bdev, type, &gman->manager);
183 ttm_resource_manager_set_used(man, true);
184 return 0;
185 }
186
vmw_gmrid_man_fini(struct vmw_private * dev_priv,int type)187 void vmw_gmrid_man_fini(struct vmw_private *dev_priv, int type)
188 {
189 struct ttm_resource_manager *man = ttm_manager_type(&dev_priv->bdev, type);
190 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
191
192 ttm_resource_manager_set_used(man, false);
193
194 ttm_resource_manager_evict_all(&dev_priv->bdev, man);
195
196 ttm_resource_manager_cleanup(man);
197
198 ttm_set_driver_manager(&dev_priv->bdev, type, NULL);
199 ida_destroy(&gman->gmr_ida);
200 kfree(gman);
201
202 }
203
204 static const struct ttm_resource_manager_func vmw_gmrid_manager_func = {
205 .alloc = vmw_gmrid_man_get_node,
206 .free = vmw_gmrid_man_put_node,
207 .debug = vmw_gmrid_man_debug
208 };
209
