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 }; 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 += (*res)->num_pages; 74 if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages)) 75 goto nospace; 76 } 77 78 (*res)->start = id; 79 80 spin_unlock(&gman->lock); 81 return 0; 82 83 nospace: 84 gman->used_gmr_pages -= (*res)->num_pages; 85 spin_unlock(&gman->lock); 86 ida_free(&gman->gmr_ida, id); 87 kfree(*res); 88 return -ENOSPC; 89 } 90 91 static void vmw_gmrid_man_put_node(struct ttm_resource_manager *man, 92 struct ttm_resource *res) 93 { 94 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man); 95 96 ida_free(&gman->gmr_ida, res->start); 97 spin_lock(&gman->lock); 98 gman->used_gmr_pages -= res->num_pages; 99 spin_unlock(&gman->lock); 100 kfree(res); 101 } 102 103 static const struct ttm_resource_manager_func vmw_gmrid_manager_func; 104 105 int vmw_gmrid_man_init(struct vmw_private *dev_priv, int type) 106 { 107 struct ttm_resource_manager *man; 108 struct vmwgfx_gmrid_man *gman = 109 kzalloc(sizeof(*gman), GFP_KERNEL); 110 111 if (unlikely(!gman)) 112 return -ENOMEM; 113 114 man = &gman->manager; 115 116 man->func = &vmw_gmrid_manager_func; 117 /* TODO: This is most likely not correct */ 118 man->use_tt = true; 119 ttm_resource_manager_init(man, 0); 120 spin_lock_init(&gman->lock); 121 gman->used_gmr_pages = 0; 122 ida_init(&gman->gmr_ida); 123 124 switch (type) { 125 case VMW_PL_GMR: 126 gman->max_gmr_ids = dev_priv->max_gmr_ids; 127 gman->max_gmr_pages = dev_priv->max_gmr_pages; 128 break; 129 case VMW_PL_MOB: 130 gman->max_gmr_ids = VMWGFX_NUM_MOB; 131 gman->max_gmr_pages = dev_priv->max_mob_pages; 132 break; 133 default: 134 BUG(); 135 } 136 ttm_set_driver_manager(&dev_priv->bdev, type, &gman->manager); 137 ttm_resource_manager_set_used(man, true); 138 return 0; 139 } 140 141 void vmw_gmrid_man_fini(struct vmw_private *dev_priv, int type) 142 { 143 struct ttm_resource_manager *man = ttm_manager_type(&dev_priv->bdev, type); 144 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man); 145 146 ttm_resource_manager_set_used(man, false); 147 148 ttm_resource_manager_evict_all(&dev_priv->bdev, man); 149 150 ttm_resource_manager_cleanup(man); 151 152 ttm_set_driver_manager(&dev_priv->bdev, type, NULL); 153 ida_destroy(&gman->gmr_ida); 154 kfree(gman); 155 156 } 157 158 static const struct ttm_resource_manager_func vmw_gmrid_manager_func = { 159 .alloc = vmw_gmrid_man_get_node, 160 .free = vmw_gmrid_man_put_node, 161 }; 162