1 /************************************************************************** 2 * 3 * Copyright (c) 2006-2009 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 #ifndef TTM_MEMORY_H 29 #define TTM_MEMORY_H 30 31 #include <linux/workqueue.h> 32 #include <linux/spinlock.h> 33 #include <linux/bug.h> 34 #include <linux/wait.h> 35 #include <linux/errno.h> 36 #include <linux/kobject.h> 37 #include <linux/mm.h> 38 #include "ttm_bo_api.h" 39 40 /** 41 * struct ttm_mem_global - Global memory accounting structure. 42 * 43 * @shrink: A single callback to shrink TTM memory usage. Extend this 44 * to a linked list to be able to handle multiple callbacks when needed. 45 * @swap_queue: A workqueue to handle shrinking in low memory situations. We 46 * need a separate workqueue since it will spend a lot of time waiting 47 * for the GPU, and this will otherwise block other workqueue tasks(?) 48 * At this point we use only a single-threaded workqueue. 49 * @work: The workqueue callback for the shrink queue. 50 * @lock: Lock to protect the @shrink - and the memory accounting members, 51 * that is, essentially the whole structure with some exceptions. 52 * @lower_mem_limit: include lower limit of swap space and lower limit of 53 * system memory. 54 * @zones: Array of pointers to accounting zones. 55 * @num_zones: Number of populated entries in the @zones array. 56 * @zone_kernel: Pointer to the kernel zone. 57 * @zone_highmem: Pointer to the highmem zone if there is one. 58 * @zone_dma32: Pointer to the dma32 zone if there is one. 59 * 60 * Note that this structure is not per device. It should be global for all 61 * graphics devices. 62 */ 63 64 #define TTM_MEM_MAX_ZONES 2 65 struct ttm_mem_zone; 66 extern struct ttm_mem_global { 67 struct kobject kobj; 68 struct workqueue_struct *swap_queue; 69 struct work_struct work; 70 spinlock_t lock; 71 uint64_t lower_mem_limit; 72 struct ttm_mem_zone *zones[TTM_MEM_MAX_ZONES]; 73 unsigned int num_zones; 74 struct ttm_mem_zone *zone_kernel; 75 #ifdef CONFIG_HIGHMEM 76 struct ttm_mem_zone *zone_highmem; 77 #else 78 struct ttm_mem_zone *zone_dma32; 79 #endif 80 } ttm_mem_glob; 81 82 int ttm_mem_global_init(struct ttm_mem_global *glob); 83 void ttm_mem_global_release(struct ttm_mem_global *glob); 84 int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory, 85 struct ttm_operation_ctx *ctx); 86 void ttm_mem_global_free(struct ttm_mem_global *glob, uint64_t amount); 87 int ttm_mem_global_alloc_page(struct ttm_mem_global *glob, 88 struct page *page, uint64_t size, 89 struct ttm_operation_ctx *ctx); 90 void ttm_mem_global_free_page(struct ttm_mem_global *glob, 91 struct page *page, uint64_t size); 92 size_t ttm_round_pot(size_t size); 93 bool ttm_check_under_lowerlimit(struct ttm_mem_global *glob, uint64_t num_pages, 94 struct ttm_operation_ctx *ctx); 95 #endif 96