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 id = ida_alloc_max(&gman->gmr_ida, gman->max_gmr_ids - 1, GFP_KERNEL); 57 if (id < 0) 58 return (id != -ENOMEM ? 0 : id); 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 nospace; 66 } 67 68 mem->mm_node = gman; 69 mem->start = id; 70 mem->num_pages = bo->num_pages; 71 72 spin_unlock(&gman->lock); 73 return 0; 74 75 nospace: 76 gman->used_gmr_pages -= bo->num_pages; 77 spin_unlock(&gman->lock); 78 ida_free(&gman->gmr_ida, id); 79 return -ENOSPC; 80 } 81 82 static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man, 83 struct ttm_mem_reg *mem) 84 { 85 struct vmwgfx_gmrid_man *gman = 86 (struct vmwgfx_gmrid_man *)man->priv; 87 88 if (mem->mm_node) { 89 ida_free(&gman->gmr_ida, mem->start); 90 spin_lock(&gman->lock); 91 gman->used_gmr_pages -= mem->num_pages; 92 spin_unlock(&gman->lock); 93 mem->mm_node = NULL; 94 } 95 } 96 97 static int vmw_gmrid_man_init(struct ttm_mem_type_manager *man, 98 unsigned long p_size) 99 { 100 struct vmw_private *dev_priv = 101 container_of(man->bdev, struct vmw_private, bdev); 102 struct vmwgfx_gmrid_man *gman = 103 kzalloc(sizeof(*gman), GFP_KERNEL); 104 105 if (unlikely(!gman)) 106 return -ENOMEM; 107 108 spin_lock_init(&gman->lock); 109 gman->used_gmr_pages = 0; 110 ida_init(&gman->gmr_ida); 111 112 switch (p_size) { 113 case VMW_PL_GMR: 114 gman->max_gmr_ids = dev_priv->max_gmr_ids; 115 gman->max_gmr_pages = dev_priv->max_gmr_pages; 116 break; 117 case VMW_PL_MOB: 118 gman->max_gmr_ids = VMWGFX_NUM_MOB; 119 gman->max_gmr_pages = dev_priv->max_mob_pages; 120 break; 121 default: 122 BUG(); 123 } 124 man->priv = (void *) gman; 125 return 0; 126 } 127 128 static int vmw_gmrid_man_takedown(struct ttm_mem_type_manager *man) 129 { 130 struct vmwgfx_gmrid_man *gman = 131 (struct vmwgfx_gmrid_man *)man->priv; 132 133 if (gman) { 134 ida_destroy(&gman->gmr_ida); 135 kfree(gman); 136 } 137 return 0; 138 } 139 140 static void vmw_gmrid_man_debug(struct ttm_mem_type_manager *man, 141 struct drm_printer *printer) 142 { 143 drm_printf(printer, "No debug info available for the GMR id manager\n"); 144 } 145 146 const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = { 147 .init = vmw_gmrid_man_init, 148 .takedown = vmw_gmrid_man_takedown, 149 .get_node = vmw_gmrid_man_get_node, 150 .put_node = vmw_gmrid_man_put_node, 151 .debug = vmw_gmrid_man_debug 152 }; 153