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 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 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 ttm_resource_fini(man, *res); 69 kfree(*res); 70 return id; 71 } 72 73 spin_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("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, sizeof(buf), 104 "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(buf); 107 DRM_WARN("%s", buf); 108 goto nospace; 109 } 110 } 111 } 112 113 (*res)->start = id; 114 115 spin_unlock(&gman->lock); 116 return 0; 117 118 nospace: 119 gman->used_gmr_pages -= PFN_UP((*res)->size); 120 spin_unlock(&gman->lock); 121 ida_free(&gman->gmr_ida, id); 122 ttm_resource_fini(man, *res); 123 kfree(*res); 124 return -ENOSPC; 125 } 126 127 static 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, res->start); 133 spin_lock(&gman->lock); 134 gman->used_gmr_pages -= PFN_UP(res->size); 135 spin_unlock(&gman->lock); 136 ttm_resource_fini(man, res); 137 kfree(res); 138 } 139 140 static 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(printer, "%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 } 151 152 static const struct ttm_resource_manager_func vmw_gmrid_manager_func; 153 154 int 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, &dev_priv->bdev, 0); 168 spin_lock_init(&gman->lock); 169 gman->used_gmr_pages = 0; 170 ida_init(&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(&dev_priv->bdev, type, &gman->manager); 186 ttm_resource_manager_set_used(man, true); 187 return 0; 188 } 189 190 void vmw_gmrid_man_fini(struct vmw_private *dev_priv, int type) 191 { 192 struct ttm_resource_manager *man = ttm_manager_type(&dev_priv->bdev, type); 193 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man); 194 195 ttm_resource_manager_set_used(man, false); 196 197 ttm_resource_manager_evict_all(&dev_priv->bdev, man); 198 199 ttm_resource_manager_cleanup(man); 200 201 ttm_set_driver_manager(&dev_priv->bdev, type, NULL); 202 ida_destroy(&gman->gmr_ida); 203 kfree(gman); 204 205 } 206 207 static 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