1 // SPDX-License-Identifier: GPL-2.0+
2 // Copyright 2017 IBM Corp.
3 #ifndef _OCXL_INTERNAL_H_
4 #define _OCXL_INTERNAL_H_
5 
6 #include <linux/pci.h>
7 #include <linux/cdev.h>
8 #include <linux/list.h>
9 #include <misc/ocxl.h>
10 
11 #define MAX_IRQ_PER_LINK	2000
12 #define MAX_IRQ_PER_CONTEXT	MAX_IRQ_PER_LINK
13 
14 extern struct pci_driver ocxl_pci_driver;
15 
16 struct ocxl_fn {
17 	struct device dev;
18 	int bar_used[3];
19 	struct ocxl_fn_config config;
20 	struct list_head afu_list;
21 	int pasid_base;
22 	int actag_base;
23 	int actag_enabled;
24 	int actag_supported;
25 	struct list_head pasid_list;
26 	struct list_head actag_list;
27 	void *link;
28 };
29 
30 struct ocxl_file_info {
31 	struct ocxl_afu *afu;
32 	struct device dev;
33 	struct cdev cdev;
34 	struct bin_attribute attr_global_mmio;
35 };
36 
37 struct ocxl_afu {
38 	struct kref kref;
39 	struct ocxl_fn *fn;
40 	struct list_head list;
41 	struct ocxl_afu_config config;
42 	int pasid_base;
43 	int pasid_count; /* opened contexts */
44 	int pasid_max; /* maximum number of contexts */
45 	int actag_base;
46 	int actag_enabled;
47 	struct mutex contexts_lock;
48 	struct idr contexts_idr;
49 	struct mutex afu_control_lock;
50 	u64 global_mmio_start;
51 	u64 irq_base_offset;
52 	void __iomem *global_mmio_ptr;
53 	u64 pp_mmio_start;
54 	void *private;
55 };
56 
57 enum ocxl_context_status {
58 	CLOSED,
59 	OPENED,
60 	ATTACHED,
61 };
62 
63 // Contains metadata about a translation fault
64 struct ocxl_xsl_error {
65 	u64 addr; // The address that triggered the fault
66 	u64 dsisr; // the value of the dsisr register
67 	u64 count; // The number of times this fault has been triggered
68 };
69 
70 struct ocxl_context {
71 	struct ocxl_afu *afu;
72 	int pasid;
73 	struct mutex status_mutex;
74 	enum ocxl_context_status status;
75 	struct address_space *mapping;
76 	struct mutex mapping_lock;
77 	wait_queue_head_t events_wq;
78 	struct mutex xsl_error_lock;
79 	struct ocxl_xsl_error xsl_error;
80 	struct mutex irq_lock;
81 	struct idr irq_idr;
82 	u16 tidr; // Thread ID used for P9 wait implementation
83 };
84 
85 struct ocxl_process_element {
86 	__be64 config_state;
87 	__be32 reserved1[11];
88 	__be32 lpid;
89 	__be32 tid;
90 	__be32 pid;
91 	__be32 reserved2[10];
92 	__be64 amr;
93 	__be32 reserved3[3];
94 	__be32 software_state;
95 };
96 
97 int ocxl_create_cdev(struct ocxl_afu *afu);
98 void ocxl_destroy_cdev(struct ocxl_afu *afu);
99 int ocxl_file_register_afu(struct ocxl_afu *afu);
100 void ocxl_file_unregister_afu(struct ocxl_afu *afu);
101 
102 int ocxl_file_init(void);
103 void ocxl_file_exit(void);
104 
105 int ocxl_pasid_afu_alloc(struct ocxl_fn *fn, u32 size);
106 void ocxl_pasid_afu_free(struct ocxl_fn *fn, u32 start, u32 size);
107 int ocxl_actag_afu_alloc(struct ocxl_fn *fn, u32 size);
108 void ocxl_actag_afu_free(struct ocxl_fn *fn, u32 start, u32 size);
109 
110 /*
111  * Get the max PASID value that can be used by the function
112  */
113 int ocxl_config_get_pasid_info(struct pci_dev *dev, int *count);
114 
115 /*
116  * Check if an AFU index is valid for the given function.
117  *
118  * AFU indexes can be sparse, so a driver should check all indexes up
119  * to the maximum found in the function description
120  */
121 int ocxl_config_check_afu_index(struct pci_dev *dev,
122 				struct ocxl_fn_config *fn, int afu_idx);
123 
124 /**
125  * Update values within a Process Element
126  *
127  * link_handle: the link handle associated with the process element
128  * pasid: the PASID for the AFU context
129  * tid: the new thread id for the process element
130  */
131 int ocxl_link_update_pe(void *link_handle, int pasid, __u16 tid);
132 
133 int ocxl_context_mmap(struct ocxl_context *ctx,
134 			struct vm_area_struct *vma);
135 void ocxl_context_detach_all(struct ocxl_afu *afu);
136 
137 int ocxl_sysfs_register_afu(struct ocxl_file_info *info);
138 void ocxl_sysfs_unregister_afu(struct ocxl_file_info *info);
139 
140 int ocxl_irq_offset_to_id(struct ocxl_context *ctx, u64 offset);
141 u64 ocxl_irq_id_to_offset(struct ocxl_context *ctx, int irq_id);
142 void ocxl_afu_irq_free_all(struct ocxl_context *ctx);
143 
144 #endif /* _OCXL_INTERNAL_H_ */
145