1 /************************************************************************** 2 * 3 * Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA 4 * All Rights Reserved. 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 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 int vmw_gmrid_man_get_node(struct ttm_mem_type_manager *man, 48 struct ttm_buffer_object *bo, 49 struct ttm_placement *placement, 50 uint32_t flags, 51 struct ttm_mem_reg *mem) 52 { 53 struct vmwgfx_gmrid_man *gman = 54 (struct vmwgfx_gmrid_man *)man->priv; 55 int ret = 0; 56 int id; 57 58 mem->mm_node = NULL; 59 60 spin_lock(&gman->lock); 61 62 if (gman->max_gmr_pages > 0) { 63 gman->used_gmr_pages += bo->num_pages; 64 if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages)) 65 goto out_err_locked; 66 } 67 68 do { 69 spin_unlock(&gman->lock); 70 if (unlikely(ida_pre_get(&gman->gmr_ida, GFP_KERNEL) == 0)) { 71 ret = -ENOMEM; 72 goto out_err; 73 } 74 spin_lock(&gman->lock); 75 76 ret = ida_get_new(&gman->gmr_ida, &id); 77 if (unlikely(ret == 0 && id >= gman->max_gmr_ids)) { 78 ida_remove(&gman->gmr_ida, id); 79 ret = 0; 80 goto out_err_locked; 81 } 82 } while (ret == -EAGAIN); 83 84 if (likely(ret == 0)) { 85 mem->mm_node = gman; 86 mem->start = id; 87 mem->num_pages = bo->num_pages; 88 } else 89 goto out_err_locked; 90 91 spin_unlock(&gman->lock); 92 return 0; 93 94 out_err: 95 spin_lock(&gman->lock); 96 out_err_locked: 97 gman->used_gmr_pages -= bo->num_pages; 98 spin_unlock(&gman->lock); 99 return ret; 100 } 101 102 static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man, 103 struct ttm_mem_reg *mem) 104 { 105 struct vmwgfx_gmrid_man *gman = 106 (struct vmwgfx_gmrid_man *)man->priv; 107 108 if (mem->mm_node) { 109 spin_lock(&gman->lock); 110 ida_remove(&gman->gmr_ida, mem->start); 111 gman->used_gmr_pages -= mem->num_pages; 112 spin_unlock(&gman->lock); 113 mem->mm_node = NULL; 114 } 115 } 116 117 static int vmw_gmrid_man_init(struct ttm_mem_type_manager *man, 118 unsigned long p_size) 119 { 120 struct vmw_private *dev_priv = 121 container_of(man->bdev, struct vmw_private, bdev); 122 struct vmwgfx_gmrid_man *gman = 123 kzalloc(sizeof(*gman), GFP_KERNEL); 124 125 if (unlikely(gman == NULL)) 126 return -ENOMEM; 127 128 spin_lock_init(&gman->lock); 129 gman->used_gmr_pages = 0; 130 ida_init(&gman->gmr_ida); 131 132 switch (p_size) { 133 case VMW_PL_GMR: 134 gman->max_gmr_ids = dev_priv->max_gmr_ids; 135 gman->max_gmr_pages = dev_priv->max_gmr_pages; 136 break; 137 case VMW_PL_MOB: 138 gman->max_gmr_ids = VMWGFX_NUM_MOB; 139 gman->max_gmr_pages = dev_priv->max_mob_pages; 140 break; 141 default: 142 BUG(); 143 } 144 man->priv = (void *) gman; 145 return 0; 146 } 147 148 static int vmw_gmrid_man_takedown(struct ttm_mem_type_manager *man) 149 { 150 struct vmwgfx_gmrid_man *gman = 151 (struct vmwgfx_gmrid_man *)man->priv; 152 153 if (gman) { 154 ida_destroy(&gman->gmr_ida); 155 kfree(gman); 156 } 157 return 0; 158 } 159 160 static void vmw_gmrid_man_debug(struct ttm_mem_type_manager *man, 161 const char *prefix) 162 { 163 printk(KERN_INFO "%s: No debug info available for the GMR " 164 "id manager.\n", prefix); 165 } 166 167 const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = { 168 vmw_gmrid_man_init, 169 vmw_gmrid_man_takedown, 170 vmw_gmrid_man_get_node, 171 vmw_gmrid_man_put_node, 172 vmw_gmrid_man_debug 173 }; 174