1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * VMware VMCI Driver
4 *
5 * Copyright (C) 2012 VMware, Inc. All rights reserved.
6 */
7
8 #ifndef _VMCI_QUEUE_PAIR_H_
9 #define _VMCI_QUEUE_PAIR_H_
10
11 #include <linux/vmw_vmci_defs.h>
12 #include <linux/types.h>
13
14 #include "vmci_context.h"
15
16 /* Callback needed for correctly waiting on events. */
17 typedef int (*vmci_event_release_cb) (void *client_data);
18
19 /* Guest device port I/O. */
20 struct ppn_set {
21 u64 num_produce_pages;
22 u64 num_consume_pages;
23 u64 *produce_ppns;
24 u64 *consume_ppns;
25 bool initialized;
26 };
27
28 /* VMCIqueue_pairAllocInfo */
29 struct vmci_qp_alloc_info {
30 struct vmci_handle handle;
31 u32 peer;
32 u32 flags;
33 u64 produce_size;
34 u64 consume_size;
35 u64 ppn_va; /* Start VA of queue pair PPNs. */
36 u64 num_ppns;
37 s32 result;
38 u32 version;
39 };
40
41 /* VMCIqueue_pairSetVAInfo */
42 struct vmci_qp_set_va_info {
43 struct vmci_handle handle;
44 u64 va; /* Start VA of queue pair PPNs. */
45 u64 num_ppns;
46 u32 version;
47 s32 result;
48 };
49
50 /*
51 * For backwards compatibility, here is a version of the
52 * VMCIqueue_pairPageFileInfo before host support end-points was added.
53 * Note that the current version of that structure requires VMX to
54 * pass down the VA of the mapped file. Before host support was added
55 * there was nothing of the sort. So, when the driver sees the ioctl
56 * with a parameter that is the sizeof
57 * VMCIqueue_pairPageFileInfo_NoHostQP then it can infer that the version
58 * of VMX running can't attach to host end points because it doesn't
59 * provide the VA of the mapped files.
60 *
61 * The Linux driver doesn't get an indication of the size of the
62 * structure passed down from user space. So, to fix a long standing
63 * but unfiled bug, the _pad field has been renamed to version.
64 * Existing versions of VMX always initialize the PageFileInfo
65 * structure so that _pad, er, version is set to 0.
66 *
67 * A version value of 1 indicates that the size of the structure has
68 * been increased to include two UVA's: produce_uva and consume_uva.
69 * These UVA's are of the mmap()'d queue contents backing files.
70 *
71 * In addition, if when VMX is sending down the
72 * VMCIqueue_pairPageFileInfo structure it gets an error then it will
73 * try again with the _NoHostQP version of the file to see if an older
74 * VMCI kernel module is running.
75 */
76
77 /* VMCIqueue_pairPageFileInfo */
78 struct vmci_qp_page_file_info {
79 struct vmci_handle handle;
80 u64 produce_page_file; /* User VA. */
81 u64 consume_page_file; /* User VA. */
82 u64 produce_page_file_size; /* Size of the file name array. */
83 u64 consume_page_file_size; /* Size of the file name array. */
84 s32 result;
85 u32 version; /* Was _pad. */
86 u64 produce_va; /* User VA of the mapped file. */
87 u64 consume_va; /* User VA of the mapped file. */
88 };
89
90 /* vmci queuepair detach info */
91 struct vmci_qp_dtch_info {
92 struct vmci_handle handle;
93 s32 result;
94 u32 _pad;
95 };
96
97 /*
98 * struct vmci_qp_page_store describes how the memory of a given queue pair
99 * is backed. When the queue pair is between the host and a guest, the
100 * page store consists of references to the guest pages. On vmkernel,
101 * this is a list of PPNs, and on hosted, it is a user VA where the
102 * queue pair is mapped into the VMX address space.
103 */
104 struct vmci_qp_page_store {
105 /* Reference to pages backing the queue pair. */
106 u64 pages;
107 /* Length of pageList/virtual address range (in pages). */
108 u32 len;
109 };
110
111 /*
112 * This data type contains the information about a queue.
113 * There are two queues (hence, queue pairs) per transaction model between a
114 * pair of end points, A & B. One queue is used by end point A to transmit
115 * commands and responses to B. The other queue is used by B to transmit
116 * commands and responses.
117 *
118 * struct vmci_queue_kern_if is a per-OS defined Queue structure. It contains
119 * either a direct pointer to the linear address of the buffer contents or a
120 * pointer to structures which help the OS locate those data pages. See
121 * vmciKernelIf.c for each platform for its definition.
122 */
123 struct vmci_queue {
124 struct vmci_queue_header *q_header;
125 struct vmci_queue_header *saved_header;
126 struct vmci_queue_kern_if *kernel_if;
127 };
128
129 /*
130 * Utility function that checks whether the fields of the page
131 * store contain valid values.
132 * Result:
133 * true if the page store is wellformed. false otherwise.
134 */
135 static inline bool
VMCI_QP_PAGESTORE_IS_WELLFORMED(struct vmci_qp_page_store * page_store)136 VMCI_QP_PAGESTORE_IS_WELLFORMED(struct vmci_qp_page_store *page_store)
137 {
138 return page_store->len >= 2;
139 }
140
141 void vmci_qp_broker_exit(void);
142 int vmci_qp_broker_alloc(struct vmci_handle handle, u32 peer,
143 u32 flags, u32 priv_flags,
144 u64 produce_size, u64 consume_size,
145 struct vmci_qp_page_store *page_store,
146 struct vmci_ctx *context);
147 int vmci_qp_broker_set_page_store(struct vmci_handle handle,
148 u64 produce_uva, u64 consume_uva,
149 struct vmci_ctx *context);
150 int vmci_qp_broker_detach(struct vmci_handle handle, struct vmci_ctx *context);
151
152 void vmci_qp_guest_endpoints_exit(void);
153
154 int vmci_qp_alloc(struct vmci_handle *handle,
155 struct vmci_queue **produce_q, u64 produce_size,
156 struct vmci_queue **consume_q, u64 consume_size,
157 u32 peer, u32 flags, u32 priv_flags,
158 bool guest_endpoint, vmci_event_release_cb wakeup_cb,
159 void *client_data);
160 int vmci_qp_broker_map(struct vmci_handle handle,
161 struct vmci_ctx *context, u64 guest_mem);
162 int vmci_qp_broker_unmap(struct vmci_handle handle,
163 struct vmci_ctx *context, u32 gid);
164
165 #endif /* _VMCI_QUEUE_PAIR_H_ */
166