1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Header file for FPGA Accelerated Function Unit (AFU) Driver
4  *
5  * Copyright (C) 2017-2018 Intel Corporation, Inc.
6  *
7  * Authors:
8  *     Wu Hao <hao.wu@intel.com>
9  *     Xiao Guangrong <guangrong.xiao@linux.intel.com>
10  *     Joseph Grecco <joe.grecco@intel.com>
11  *     Enno Luebbers <enno.luebbers@intel.com>
12  *     Tim Whisonant <tim.whisonant@intel.com>
13  *     Ananda Ravuri <ananda.ravuri@intel.com>
14  *     Henry Mitchel <henry.mitchel@intel.com>
15  */
16 
17 #ifndef __DFL_AFU_H
18 #define __DFL_AFU_H
19 
20 #include <linux/mm.h>
21 
22 #include "dfl.h"
23 
24 /**
25  * struct dfl_afu_mmio_region - afu mmio region data structure
26  *
27  * @index: region index.
28  * @flags: region flags (access permission).
29  * @size: region size.
30  * @offset: region offset from start of the device fd.
31  * @phys: region's physical address.
32  * @node: node to add to afu feature dev's region list.
33  */
34 struct dfl_afu_mmio_region {
35 	u32 index;
36 	u32 flags;
37 	u64 size;
38 	u64 offset;
39 	u64 phys;
40 	struct list_head node;
41 };
42 
43 /**
44  * struct dfl_afu_dma_region - afu DMA region data structure
45  *
46  * @user_addr: region userspace virtual address.
47  * @length: region length.
48  * @iova: region IO virtual address.
49  * @pages: ptr to pages of this region.
50  * @node: rb tree node.
51  * @in_use: flag to indicate if this region is in_use.
52  */
53 struct dfl_afu_dma_region {
54 	u64 user_addr;
55 	u64 length;
56 	u64 iova;
57 	struct page **pages;
58 	struct rb_node node;
59 	bool in_use;
60 };
61 
62 /**
63  * struct dfl_afu - afu device data structure
64  *
65  * @region_cur_offset: current region offset from start to the device fd.
66  * @num_regions: num of mmio regions.
67  * @regions: the mmio region linked list of this afu feature device.
68  * @dma_regions: root of dma regions rb tree.
69  * @num_umsgs: num of umsgs.
70  * @pdata: afu platform device's pdata.
71  */
72 struct dfl_afu {
73 	u64 region_cur_offset;
74 	int num_regions;
75 	u8 num_umsgs;
76 	struct list_head regions;
77 	struct rb_root dma_regions;
78 
79 	struct dfl_feature_platform_data *pdata;
80 };
81 
82 /* hold pdata->lock when call __afu_port_enable/disable */
83 int __afu_port_enable(struct platform_device *pdev);
84 int __afu_port_disable(struct platform_device *pdev);
85 
86 void afu_mmio_region_init(struct dfl_feature_platform_data *pdata);
87 int afu_mmio_region_add(struct dfl_feature_platform_data *pdata,
88 			u32 region_index, u64 region_size, u64 phys, u32 flags);
89 void afu_mmio_region_destroy(struct dfl_feature_platform_data *pdata);
90 int afu_mmio_region_get_by_index(struct dfl_feature_platform_data *pdata,
91 				 u32 region_index,
92 				 struct dfl_afu_mmio_region *pregion);
93 int afu_mmio_region_get_by_offset(struct dfl_feature_platform_data *pdata,
94 				  u64 offset, u64 size,
95 				  struct dfl_afu_mmio_region *pregion);
96 void afu_dma_region_init(struct dfl_feature_platform_data *pdata);
97 void afu_dma_region_destroy(struct dfl_feature_platform_data *pdata);
98 int afu_dma_map_region(struct dfl_feature_platform_data *pdata,
99 		       u64 user_addr, u64 length, u64 *iova);
100 int afu_dma_unmap_region(struct dfl_feature_platform_data *pdata, u64 iova);
101 struct dfl_afu_dma_region *
102 afu_dma_region_find(struct dfl_feature_platform_data *pdata,
103 		    u64 iova, u64 size);
104 
105 extern const struct dfl_feature_ops port_err_ops;
106 extern const struct dfl_feature_id port_err_id_table[];
107 extern const struct attribute_group port_err_group;
108 
109 #endif /* __DFL_AFU_H */
110