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1// SPDX-License-Identifier: GPL-2.0 OR MIT2/**************************************************************************3 *4 * Copyright 2007-2010 VMware, Inc., Palo Alto, CA., USA5 *6 * Permission is hereby granted, free of charge, to any person obtaining a7 * copy of this software and associated documentation files (the8 * "Software"), to deal in the Software without restriction, including9 * without limitation the rights to use, copy, modify, merge, publish,10 * distribute, sub license, and/or sell copies of the Software, and to11 * permit persons to whom the Software is furnished to do so, subject to12 * the following conditions:13 *14 * The above copyright notice and this permission notice (including the15 * next paragraph) shall be included in all copies or substantial portions16 * of the Software.17 *18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL21 * 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 OR23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE24 * 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);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 to79 * 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 keep82 * 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 } else95 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 118nospace: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 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, 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 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(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 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, &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 190void 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 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_debug211};212