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 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 } 123 124 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 } 136 137 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; 150 151 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 } 186 187 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