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_module.h> 33 #include <drm/ttm/ttm_bo_driver.h> 34 #include <drm/ttm/ttm_placement.h> 35 #include <linux/idr.h> 36 #include <linux/spinlock.h> 37 #include <linux/kernel.h> 38 39 struct vmwgfx_gmrid_man { 40 struct ttm_resource_manager manager; 41 spinlock_t lock; 42 struct ida gmr_ida; 43 uint32_t max_gmr_ids; 44 uint32_t max_gmr_pages; 45 uint32_t used_gmr_pages; 46 }; 47 48 static struct vmwgfx_gmrid_man *to_gmrid_manager(struct ttm_resource_manager *man) 49 { 50 return container_of(man, struct vmwgfx_gmrid_man, manager); 51 } 52 53 static int vmw_gmrid_man_get_node(struct ttm_resource_manager *man, 54 struct ttm_buffer_object *bo, 55 const struct ttm_place *place, 56 struct ttm_resource *mem) 57 { 58 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man); 59 int id; 60 61 id = ida_alloc_max(&gman->gmr_ida, gman->max_gmr_ids - 1, GFP_KERNEL); 62 if (id < 0) 63 return id; 64 65 spin_lock(&gman->lock); 66 67 if (gman->max_gmr_pages > 0) { 68 gman->used_gmr_pages += bo->num_pages; 69 if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages)) 70 goto nospace; 71 } 72 73 mem->mm_node = gman; 74 mem->start = id; 75 mem->num_pages = bo->num_pages; 76 77 spin_unlock(&gman->lock); 78 return 0; 79 80 nospace: 81 gman->used_gmr_pages -= bo->num_pages; 82 spin_unlock(&gman->lock); 83 ida_free(&gman->gmr_ida, id); 84 return -ENOSPC; 85 } 86 87 static void vmw_gmrid_man_put_node(struct ttm_resource_manager *man, 88 struct ttm_resource *mem) 89 { 90 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man); 91 92 if (mem->mm_node) { 93 ida_free(&gman->gmr_ida, mem->start); 94 spin_lock(&gman->lock); 95 gman->used_gmr_pages -= mem->num_pages; 96 spin_unlock(&gman->lock); 97 mem->mm_node = NULL; 98 } 99 } 100 101 static const struct ttm_resource_manager_func vmw_gmrid_manager_func; 102 103 int vmw_gmrid_man_init(struct vmw_private *dev_priv, int type) 104 { 105 struct ttm_resource_manager *man; 106 struct vmwgfx_gmrid_man *gman = 107 kzalloc(sizeof(*gman), GFP_KERNEL); 108 109 if (unlikely(!gman)) 110 return -ENOMEM; 111 112 man = &gman->manager; 113 114 man->func = &vmw_gmrid_manager_func; 115 /* TODO: This is most likely not correct */ 116 man->use_tt = true; 117 ttm_resource_manager_init(man, 0); 118 spin_lock_init(&gman->lock); 119 gman->used_gmr_pages = 0; 120 ida_init(&gman->gmr_ida); 121 122 switch (type) { 123 case VMW_PL_GMR: 124 gman->max_gmr_ids = dev_priv->max_gmr_ids; 125 gman->max_gmr_pages = dev_priv->max_gmr_pages; 126 break; 127 case VMW_PL_MOB: 128 gman->max_gmr_ids = VMWGFX_NUM_MOB; 129 gman->max_gmr_pages = dev_priv->max_mob_pages; 130 break; 131 default: 132 BUG(); 133 } 134 ttm_set_driver_manager(&dev_priv->bdev, type, &gman->manager); 135 ttm_resource_manager_set_used(man, true); 136 return 0; 137 } 138 139 void vmw_gmrid_man_fini(struct vmw_private *dev_priv, int type) 140 { 141 struct ttm_resource_manager *man = ttm_manager_type(&dev_priv->bdev, type); 142 struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man); 143 144 ttm_resource_manager_set_used(man, false); 145 146 ttm_resource_manager_evict_all(&dev_priv->bdev, man); 147 148 ttm_resource_manager_cleanup(man); 149 150 ttm_set_driver_manager(&dev_priv->bdev, type, NULL); 151 ida_destroy(&gman->gmr_ida); 152 kfree(gman); 153 154 } 155 156 static const struct ttm_resource_manager_func vmw_gmrid_manager_func = { 157 .alloc = vmw_gmrid_man_get_node, 158 .free = vmw_gmrid_man_put_node, 159 }; 160