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 *mem) 56 { 57 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man); 58 int id; 59 60 id = ida_alloc_max(&gman->gmr_ida, gman->max_gmr_ids - 1, GFP_KERNEL); 61 if (id < 0) 62 return id; 63 64 spin_lock(&gman->lock); 65 66 if (gman->max_gmr_pages > 0) { 67 gman->used_gmr_pages += mem->num_pages; 68 if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages)) 69 goto nospace; 70 } 71 72 mem->mm_node = gman; 73 mem->start = id; 74 75 spin_unlock(&gman->lock); 76 return 0; 77 78 nospace: 79 gman->used_gmr_pages -= mem->num_pages; 80 spin_unlock(&gman->lock); 81 ida_free(&gman->gmr_ida, id); 82 return -ENOSPC; 83 } 84 85 static void vmw_gmrid_man_put_node(struct ttm_resource_manager *man, 86 struct ttm_resource *mem) 87 { 88 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man); 89 90 if (mem->mm_node) { 91 ida_free(&gman->gmr_ida, mem->start); 92 spin_lock(&gman->lock); 93 gman->used_gmr_pages -= mem->num_pages; 94 spin_unlock(&gman->lock); 95 mem->mm_node = NULL; 96 } 97 } 98 99 static const struct ttm_resource_manager_func vmw_gmrid_manager_func; 100 101 int vmw_gmrid_man_init(struct vmw_private *dev_priv, int type) 102 { 103 struct ttm_resource_manager *man; 104 struct vmwgfx_gmrid_man *gman = 105 kzalloc(sizeof(*gman), GFP_KERNEL); 106 107 if (unlikely(!gman)) 108 return -ENOMEM; 109 110 man = &gman->manager; 111 112 man->func = &vmw_gmrid_manager_func; 113 /* TODO: This is most likely not correct */ 114 man->use_tt = true; 115 ttm_resource_manager_init(man, 0); 116 spin_lock_init(&gman->lock); 117 gman->used_gmr_pages = 0; 118 ida_init(&gman->gmr_ida); 119 120 switch (type) { 121 case VMW_PL_GMR: 122 gman->max_gmr_ids = dev_priv->max_gmr_ids; 123 gman->max_gmr_pages = dev_priv->max_gmr_pages; 124 break; 125 case VMW_PL_MOB: 126 gman->max_gmr_ids = VMWGFX_NUM_MOB; 127 gman->max_gmr_pages = dev_priv->max_mob_pages; 128 break; 129 default: 130 BUG(); 131 } 132 ttm_set_driver_manager(&dev_priv->bdev, type, &gman->manager); 133 ttm_resource_manager_set_used(man, true); 134 return 0; 135 } 136 137 void vmw_gmrid_man_fini(struct vmw_private *dev_priv, int type) 138 { 139 struct ttm_resource_manager *man = ttm_manager_type(&dev_priv->bdev, type); 140 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man); 141 142 ttm_resource_manager_set_used(man, false); 143 144 ttm_resource_manager_evict_all(&dev_priv->bdev, man); 145 146 ttm_resource_manager_cleanup(man); 147 148 ttm_set_driver_manager(&dev_priv->bdev, type, NULL); 149 ida_destroy(&gman->gmr_ida); 150 kfree(gman); 151 152 } 153 154 static const struct ttm_resource_manager_func vmw_gmrid_manager_func = { 155 .alloc = vmw_gmrid_man_get_node, 156 .free = vmw_gmrid_man_put_node, 157 }; 158