1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
2 /*
3  * Copyright 2020 Advanced Micro Devices, Inc.
4  *
5  * Permission is hereby granted, free of charge, to any person obtaining a
6  * copy of this software and associated documentation files (the "Software"),
7  * to deal in the Software without restriction, including without limitation
8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9  * and/or sell copies of the Software, and to permit persons to whom the
10  * Software is furnished to do so, subject to the following conditions:
11  *
12  * The above copyright notice and this permission notice shall be included in
13  * all copies or substantial portions of the Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
19  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
20  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
21  * OTHER DEALINGS IN THE SOFTWARE.
22  *
23  * Authors: Christian König
24  */
25 
26 #ifndef _TTM_PAGE_POOL_H_
27 #define _TTM_PAGE_POOL_H_
28 
29 #include <linux/mmzone.h>
30 #include <linux/llist.h>
31 #include <linux/spinlock.h>
32 #include <drm/ttm/ttm_caching.h>
33 
34 struct device;
35 struct ttm_tt;
36 struct ttm_pool;
37 struct ttm_operation_ctx;
38 
39 /**
40  * struct ttm_pool_type - Pool for a certain memory type
41  *
42  * @pool: the pool we belong to, might be NULL for the global ones
43  * @order: the allocation order our pages have
44  * @caching: the caching type our pages have
45  * @shrinker_list: our place on the global shrinker list
46  * @lock: protection of the page list
47  * @pages: the list of pages in the pool
48  */
49 struct ttm_pool_type {
50 	struct ttm_pool *pool;
51 	unsigned int order;
52 	enum ttm_caching caching;
53 
54 	struct list_head shrinker_list;
55 
56 	spinlock_t lock;
57 	struct list_head pages;
58 };
59 
60 /**
61  * struct ttm_pool - Pool for all caching and orders
62  *
63  * @dev: the device we allocate pages for
64  * @use_dma_alloc: if coherent DMA allocations should be used
65  * @use_dma32: if GFP_DMA32 should be used
66  * @caching: pools for each caching/order
67  */
68 struct ttm_pool {
69 	struct device *dev;
70 
71 	bool use_dma_alloc;
72 	bool use_dma32;
73 
74 	struct {
75 		struct ttm_pool_type orders[MAX_ORDER];
76 	} caching[TTM_NUM_CACHING_TYPES];
77 };
78 
79 int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
80 		   struct ttm_operation_ctx *ctx);
81 void ttm_pool_free(struct ttm_pool *pool, struct ttm_tt *tt);
82 
83 void ttm_pool_init(struct ttm_pool *pool, struct device *dev,
84 		   bool use_dma_alloc, bool use_dma32);
85 void ttm_pool_fini(struct ttm_pool *pool);
86 
87 int ttm_pool_debugfs(struct ttm_pool *pool, struct seq_file *m);
88 
89 int ttm_pool_mgr_init(unsigned long num_pages);
90 void ttm_pool_mgr_fini(void);
91 
92 #endif
93