Home | History | Annotate | Line # | Download | only in ttm 
      1 /*	$NetBSD: ttm_memory.h,v 1.4 2021/12/18 23:45:46 riastradh Exp $	*/
      2 
      3 /**************************************************************************
      4  *
      5  * Copyright (c) 2006-2009 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 #ifndef TTM_MEMORY_H
     31 #define TTM_MEMORY_H
     32 
     33 #include <linux/workqueue.h>
     34 #include <linux/spinlock.h>
     35 #include <linux/bug.h>
     36 #include <linux/wait.h>
     37 #include <linux/errno.h>
     38 #include <linux/kobject.h>
     39 #include <linux/mm.h>
     40 #include "ttm_bo_api.h"
     41 
     42 /**
     43  * struct ttm_mem_global - Global memory accounting structure.
     44  *
     45  * @shrink: A single callback to shrink TTM memory usage. Extend this
     46  * to a linked list to be able to handle multiple callbacks when needed.
     47  * @swap_queue: A workqueue to handle shrinking in low memory situations. We
     48  * need a separate workqueue since it will spend a lot of time waiting
     49  * for the GPU, and this will otherwise block other workqueue tasks(?)
     50  * At this point we use only a single-threaded workqueue.
     51  * @work: The workqueue callback for the shrink queue.
     52  * @lock: Lock to protect the @shrink - and the memory accounting members,
     53  * that is, essentially the whole structure with some exceptions.
     54  * @lower_mem_limit: include lower limit of swap space and lower limit of
     55  * system memory.
     56  * @zones: Array of pointers to accounting zones.
     57  * @num_zones: Number of populated entries in the @zones array.
     58  * @zone_kernel: Pointer to the kernel zone.
     59  * @zone_highmem: Pointer to the highmem zone if there is one.
     60  * @zone_dma32: Pointer to the dma32 zone if there is one.
     61  *
     62  * Note that this structure is not per device. It should be global for all
     63  * graphics devices.
     64  */
     65 
     66 #define TTM_MEM_MAX_ZONES 2
     67 struct ttm_mem_zone;
     68 extern struct ttm_mem_global {
     69 #ifndef __NetBSD__
     70 	struct kobject kobj;
     71 #endif
     72 	struct workqueue_struct *swap_queue;
     73 	struct work_struct work;
     74 	spinlock_t lock;
     75 	uint64_t lower_mem_limit;
     76 	struct ttm_mem_zone *zones[TTM_MEM_MAX_ZONES];
     77 	unsigned int num_zones;
     78 	struct ttm_mem_zone *zone_kernel;
     79 #ifdef CONFIG_HIGHMEM
     80 	struct ttm_mem_zone *zone_highmem;
     81 #else
     82 	struct ttm_mem_zone *zone_dma32;
     83 #endif
     84 } ttm_mem_glob;
     85 
     86 extern int ttm_mem_global_init(struct ttm_mem_global *glob);
     87 extern void ttm_mem_global_release(struct ttm_mem_global *glob);
     88 extern int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
     89 				struct ttm_operation_ctx *ctx);
     90 extern void ttm_mem_global_free(struct ttm_mem_global *glob,
     91 				uint64_t amount);
     92 extern int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
     93 				     struct page *page, uint64_t size,
     94 				     struct ttm_operation_ctx *ctx);
     95 extern void ttm_mem_global_free_page(struct ttm_mem_global *glob,
     96 				     struct page *page, uint64_t size);
     97 extern size_t ttm_round_pot(size_t size);
     98 extern uint64_t ttm_get_kernel_zone_memory_size(struct ttm_mem_global *glob);
     99 extern bool ttm_check_under_lowerlimit(struct ttm_mem_global *glob,
    100 			uint64_t num_pages, struct ttm_operation_ctx *ctx);
    101 #endif
    102