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