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
37struct 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
47static 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
52static 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: *res);
65
66 id = ida_alloc_max(ida: &gman->gmr_ida, max: gman->max_gmr_ids - 1, GFP_KERNEL);
67 if (id < 0) {
68 ttm_resource_fini(man, res: *res);
69 kfree(objp: *res);
70 return id;
71 }
72
73 spin_lock(lock: &gman->lock);
74
75 if (gman->max_gmr_pages > 0) {
76 gman->used_gmr_pages += PFN_UP((*res)->size);
77 /*
78 * Because the graphics memory is a soft limit we can try to
79 * expand it instead of letting the userspace apps crash.
80 * We're just going to have a sane limit (half of RAM)
81 * on the number of MOB's that we create and will try to keep
82 * the system running until we reach that.
83 */
84 if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages)) {
85 const unsigned long max_graphics_pages = totalram_pages() / 2;
86 uint32_t new_max_pages = 0;
87
88 DRM_WARN("vmwgfx: mob memory overflow. Consider increasing guest RAM and graphicsMemory.\n");
89 vmw_host_printf(fmt: "vmwgfx, warning: mob memory overflow. Consider increasing guest RAM and graphicsMemory.\n");
90
91 if (gman->max_gmr_pages > (max_graphics_pages / 2)) {
92 DRM_WARN("vmwgfx: guest requires more than half of RAM for graphics.\n");
93 new_max_pages = max_graphics_pages;
94 } else
95 new_max_pages = gman->max_gmr_pages * 2;
96 if (new_max_pages > gman->max_gmr_pages && new_max_pages >= gman->used_gmr_pages) {
97 DRM_WARN("vmwgfx: increasing guest mob limits to %u KiB.\n",
98 ((new_max_pages) << (PAGE_SHIFT - 10)));
99
100 gman->max_gmr_pages = new_max_pages;
101 } else {
102 char buf[256];
103 snprintf(buf, size: sizeof(buf),
104 fmt: "vmwgfx, error: guest graphics is out of memory (mob limit at: %u KiB).\n",
105 ((gman->max_gmr_pages) << (PAGE_SHIFT - 10)));
106 vmw_host_printf(fmt: buf);
107 DRM_WARN("%s", buf);
108 goto nospace;
109 }
110 }
111 }
112
113 (*res)->start = id;
114
115 spin_unlock(lock: &gman->lock);
116 return 0;
117
118nospace:
119 gman->used_gmr_pages -= PFN_UP((*res)->size);
120 spin_unlock(lock: &gman->lock);
121 ida_free(&gman->gmr_ida, id);
122 ttm_resource_fini(man, res: *res);
123 kfree(objp: *res);
124 return -ENOSPC;
125}
126
127static void vmw_gmrid_man_put_node(struct ttm_resource_manager *man,
128 struct ttm_resource *res)
129{
130 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
131
132 ida_free(&gman->gmr_ida, id: res->start);
133 spin_lock(lock: &gman->lock);
134 gman->used_gmr_pages -= PFN_UP(res->size);
135 spin_unlock(lock: &gman->lock);
136 ttm_resource_fini(man, res);
137 kfree(objp: res);
138}
139
140static void vmw_gmrid_man_debug(struct ttm_resource_manager *man,
141 struct drm_printer *printer)
142{
143 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
144
145 BUG_ON(gman->type != VMW_PL_GMR && gman->type != VMW_PL_MOB);
146
147 drm_printf(p: printer, f: "%s's used: %u pages, max: %u pages, %u id's\n",
148 (gman->type == VMW_PL_MOB) ? "Mob" : "GMR",
149 gman->used_gmr_pages, gman->max_gmr_pages, gman->max_gmr_ids);
150}
151
152static const struct ttm_resource_manager_func vmw_gmrid_manager_func;
153
154int vmw_gmrid_man_init(struct vmw_private *dev_priv, int type)
155{
156 struct ttm_resource_manager *man;
157 struct vmwgfx_gmrid_man *gman =
158 kzalloc(sizeof(*gman), GFP_KERNEL);
159
160 if (unlikely(!gman))
161 return -ENOMEM;
162
163 man = &gman->manager;
164
165 man->func = &vmw_gmrid_manager_func;
166 man->use_tt = true;
167 ttm_resource_manager_init(man, bdev: &dev_priv->bdev, size: 0);
168 spin_lock_init(&gman->lock);
169 gman->used_gmr_pages = 0;
170 ida_init(ida: &gman->gmr_ida);
171 gman->type = type;
172
173 switch (type) {
174 case VMW_PL_GMR:
175 gman->max_gmr_ids = dev_priv->max_gmr_ids;
176 gman->max_gmr_pages = dev_priv->max_gmr_pages;
177 break;
178 case VMW_PL_MOB:
179 gman->max_gmr_ids = VMWGFX_NUM_MOB;
180 gman->max_gmr_pages = dev_priv->max_mob_pages;
181 break;
182 default:
183 BUG();
184 }
185 ttm_set_driver_manager(bdev: &dev_priv->bdev, type, manager: &gman->manager);
186 ttm_resource_manager_set_used(man, used: true);
187 return 0;
188}
189
190void vmw_gmrid_man_fini(struct vmw_private *dev_priv, int type)
191{
192 struct ttm_resource_manager *man = ttm_manager_type(bdev: &dev_priv->bdev, mem_type: type);
193 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
194
195 ttm_resource_manager_set_used(man, used: false);
196
197 ttm_resource_manager_evict_all(bdev: &dev_priv->bdev, man);
198
199 ttm_resource_manager_cleanup(man);
200
201 ttm_set_driver_manager(bdev: &dev_priv->bdev, type, NULL);
202 ida_destroy(ida: &gman->gmr_ida);
203 kfree(objp: gman);
204
205}
206
207static const struct ttm_resource_manager_func vmw_gmrid_manager_func = {
208 .alloc = vmw_gmrid_man_get_node,
209 .free = vmw_gmrid_man_put_node,
210 .debug = vmw_gmrid_man_debug
211};
212

source code of linux/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c