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 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 id; 55 56 mem->mm_node = NULL; 57 58 id = ida_alloc_max(&gman->gmr_ida, gman->max_gmr_ids - 1, GFP_KERNEL); 59 if (id < 0) 60 return (id != -ENOMEM ? 0 : id); 61 62 spin_lock(&gman->lock); 63 64 if (gman->max_gmr_pages > 0) { 65 gman->used_gmr_pages += bo->num_pages; 66 if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages)) 67 goto nospace; 68 } 69 70 mem->mm_node = gman; 71 mem->start = id; 72 mem->num_pages = bo->num_pages; 73 74 spin_unlock(&gman->lock); 75 return 0; 76 77 nospace: 78 gman->used_gmr_pages -= bo->num_pages; 79 spin_unlock(&gman->lock); 80 ida_free(&gman->gmr_ida, id); 81 return 0; 82 } 83 84 static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man, 85 struct ttm_mem_reg *mem) 86 { 87 struct vmwgfx_gmrid_man *gman = 88 (struct vmwgfx_gmrid_man *)man->priv; 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 int vmw_gmrid_man_init(struct ttm_mem_type_manager *man, 100 unsigned long p_size) 101 { 102 struct vmw_private *dev_priv = 103 container_of(man->bdev, struct vmw_private, bdev); 104 struct vmwgfx_gmrid_man *gman = 105 kzalloc(sizeof(*gman), GFP_KERNEL); 106 107 if (unlikely(!gman)) 108 return -ENOMEM; 109 110 spin_lock_init(&gman->lock); 111 gman->used_gmr_pages = 0; 112 ida_init(&gman->gmr_ida); 113 114 switch (p_size) { 115 case VMW_PL_GMR: 116 gman->max_gmr_ids = dev_priv->max_gmr_ids; 117 gman->max_gmr_pages = dev_priv->max_gmr_pages; 118 break; 119 case VMW_PL_MOB: 120 gman->max_gmr_ids = VMWGFX_NUM_MOB; 121 gman->max_gmr_pages = dev_priv->max_mob_pages; 122 break; 123 default: 124 BUG(); 125 } 126 man->priv = (void *) gman; 127 return 0; 128 } 129 130 static int vmw_gmrid_man_takedown(struct ttm_mem_type_manager *man) 131 { 132 struct vmwgfx_gmrid_man *gman = 133 (struct vmwgfx_gmrid_man *)man->priv; 134 135 if (gman) { 136 ida_destroy(&gman->gmr_ida); 137 kfree(gman); 138 } 139 return 0; 140 } 141 142 static void vmw_gmrid_man_debug(struct ttm_mem_type_manager *man, 143 struct drm_printer *printer) 144 { 145 drm_printf(printer, "No debug info available for the GMR id manager\n"); 146 } 147 148 const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = { 149 .init = vmw_gmrid_man_init, 150 .takedown = vmw_gmrid_man_takedown, 151 .get_node = vmw_gmrid_man_get_node, 152 .put_node = vmw_gmrid_man_put_node, 153 .debug = vmw_gmrid_man_debug 154 }; 155