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 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 **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 } 124 125 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 } 137 138 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; 151 152 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 } 187 188 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