vmwgfx_gmrid_manager.c revision 1.1.1.2.30.1
1 /* $NetBSD: vmwgfx_gmrid_manager.c,v 1.1.1.2.30.1 2019/06/10 22:08:29 christos Exp $ */ 2 3 /************************************************************************** 4 * 5 * Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA 6 * All Rights Reserved. 7 * 8 * Permission is hereby granted, free of charge, to any person obtaining a 9 * copy of this software and associated documentation files (the 10 * "Software"), to deal in the Software without restriction, including 11 * without limitation the rights to use, copy, modify, merge, publish, 12 * distribute, sub license, and/or sell copies of the Software, and to 13 * permit persons to whom the Software is furnished to do so, subject to 14 * the following conditions: 15 * 16 * The above copyright notice and this permission notice (including the 17 * next paragraph) shall be included in all copies or substantial portions 18 * of the Software. 19 * 20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 23 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 24 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 25 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 26 * USE OR OTHER DEALINGS IN THE SOFTWARE. 27 * 28 **************************************************************************/ 29 /* 30 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: vmwgfx_gmrid_manager.c,v 1.1.1.2.30.1 2019/06/10 22:08:29 christos Exp $"); 35 36 #include "vmwgfx_drv.h" 37 #include <drm/ttm/ttm_module.h> 38 #include <drm/ttm/ttm_bo_driver.h> 39 #include <drm/ttm/ttm_placement.h> 40 #include <linux/idr.h> 41 #include <linux/spinlock.h> 42 #include <linux/kernel.h> 43 44 struct vmwgfx_gmrid_man { 45 spinlock_t lock; 46 struct ida gmr_ida; 47 uint32_t max_gmr_ids; 48 uint32_t max_gmr_pages; 49 uint32_t used_gmr_pages; 50 }; 51 52 static int vmw_gmrid_man_get_node(struct ttm_mem_type_manager *man, 53 struct ttm_buffer_object *bo, 54 const struct ttm_place *place, 55 struct ttm_mem_reg *mem) 56 { 57 struct vmwgfx_gmrid_man *gman = 58 (struct vmwgfx_gmrid_man *)man->priv; 59 int ret = 0; 60 int id; 61 62 mem->mm_node = NULL; 63 64 spin_lock(&gman->lock); 65 66 if (gman->max_gmr_pages > 0) { 67 gman->used_gmr_pages += bo->num_pages; 68 if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages)) 69 goto out_err_locked; 70 } 71 72 do { 73 spin_unlock(&gman->lock); 74 if (unlikely(ida_pre_get(&gman->gmr_ida, GFP_KERNEL) == 0)) { 75 ret = -ENOMEM; 76 goto out_err; 77 } 78 spin_lock(&gman->lock); 79 80 ret = ida_get_new(&gman->gmr_ida, &id); 81 if (unlikely(ret == 0 && id >= gman->max_gmr_ids)) { 82 ida_remove(&gman->gmr_ida, id); 83 ret = 0; 84 goto out_err_locked; 85 } 86 } while (ret == -EAGAIN); 87 88 if (likely(ret == 0)) { 89 mem->mm_node = gman; 90 mem->start = id; 91 mem->num_pages = bo->num_pages; 92 } else 93 goto out_err_locked; 94 95 spin_unlock(&gman->lock); 96 return 0; 97 98 out_err: 99 spin_lock(&gman->lock); 100 out_err_locked: 101 gman->used_gmr_pages -= bo->num_pages; 102 spin_unlock(&gman->lock); 103 return ret; 104 } 105 106 static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man, 107 struct ttm_mem_reg *mem) 108 { 109 struct vmwgfx_gmrid_man *gman = 110 (struct vmwgfx_gmrid_man *)man->priv; 111 112 if (mem->mm_node) { 113 spin_lock(&gman->lock); 114 ida_remove(&gman->gmr_ida, mem->start); 115 gman->used_gmr_pages -= mem->num_pages; 116 spin_unlock(&gman->lock); 117 mem->mm_node = NULL; 118 } 119 } 120 121 static int vmw_gmrid_man_init(struct ttm_mem_type_manager *man, 122 unsigned long p_size) 123 { 124 struct vmw_private *dev_priv = 125 container_of(man->bdev, struct vmw_private, bdev); 126 struct vmwgfx_gmrid_man *gman = 127 kzalloc(sizeof(*gman), GFP_KERNEL); 128 129 if (unlikely(gman == NULL)) 130 return -ENOMEM; 131 132 spin_lock_init(&gman->lock); 133 gman->used_gmr_pages = 0; 134 ida_init(&gman->gmr_ida); 135 136 switch (p_size) { 137 case VMW_PL_GMR: 138 gman->max_gmr_ids = dev_priv->max_gmr_ids; 139 gman->max_gmr_pages = dev_priv->max_gmr_pages; 140 break; 141 case VMW_PL_MOB: 142 gman->max_gmr_ids = VMWGFX_NUM_MOB; 143 gman->max_gmr_pages = dev_priv->max_mob_pages; 144 break; 145 default: 146 BUG(); 147 } 148 man->priv = (void *) gman; 149 return 0; 150 } 151 152 static int vmw_gmrid_man_takedown(struct ttm_mem_type_manager *man) 153 { 154 struct vmwgfx_gmrid_man *gman = 155 (struct vmwgfx_gmrid_man *)man->priv; 156 157 if (gman) { 158 ida_destroy(&gman->gmr_ida); 159 kfree(gman); 160 } 161 return 0; 162 } 163 164 static void vmw_gmrid_man_debug(struct ttm_mem_type_manager *man, 165 const char *prefix) 166 { 167 printk(KERN_INFO "%s: No debug info available for the GMR " 168 "id manager.\n", prefix); 169 } 170 171 const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = { 172 vmw_gmrid_man_init, 173 vmw_gmrid_man_takedown, 174 vmw_gmrid_man_get_node, 175 vmw_gmrid_man_put_node, 176 vmw_gmrid_man_debug 177 }; 178
Indexes created Mon Oct 20 11:09:49 GMT 2025