1 /*
2  *
3  * Intel Management Engine Interface (Intel MEI) Linux driver
4  * Copyright (c) 2003-2012, Intel Corporation.
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms and conditions of the GNU General Public License,
8  * version 2, as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope it will be useful, but WITHOUT
11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
13  * more details.
14  *
15  */
16 
17 #ifndef _MEI_CLIENT_H_
18 #define _MEI_CLIENT_H_
19 
20 #include <linux/types.h>
21 #include <linux/poll.h>
22 #include <linux/mei.h>
23 
24 #include "mei_dev.h"
25 
26 /*
27  * reference counting base function
28  */
29 void mei_me_cl_init(struct mei_me_client *me_cl);
30 void mei_me_cl_put(struct mei_me_client *me_cl);
31 struct mei_me_client *mei_me_cl_get(struct mei_me_client *me_cl);
32 
33 void mei_me_cl_add(struct mei_device *dev, struct mei_me_client *me_cl);
34 void mei_me_cl_del(struct mei_device *dev, struct mei_me_client *me_cl);
35 
36 struct mei_me_client *mei_me_cl_by_uuid(struct mei_device *dev,
37 					const uuid_le *uuid);
38 struct mei_me_client *mei_me_cl_by_id(struct mei_device *dev, u8 client_id);
39 struct mei_me_client *mei_me_cl_by_uuid_id(struct mei_device *dev,
40 					   const uuid_le *uuid, u8 client_id);
41 void mei_me_cl_rm_by_uuid(struct mei_device *dev, const uuid_le *uuid);
42 void mei_me_cl_rm_by_uuid_id(struct mei_device *dev,
43 			     const uuid_le *uuid, u8 id);
44 void mei_me_cl_rm_all(struct mei_device *dev);
45 
46 /**
47  * mei_me_cl_is_active - check whether me client is active in the fw
48  *
49  * @me_cl: me client
50  *
51  * Return: true if the me client is active in the firmware
52  */
mei_me_cl_is_active(const struct mei_me_client * me_cl)53 static inline bool mei_me_cl_is_active(const struct mei_me_client *me_cl)
54 {
55 	return !list_empty_careful(&me_cl->list);
56 }
57 
58 /**
59  * mei_me_cl_uuid - return me client protocol name (uuid)
60  *
61  * @me_cl: me client
62  *
63  * Return: me client protocol name
64  */
mei_me_cl_uuid(const struct mei_me_client * me_cl)65 static inline const uuid_le *mei_me_cl_uuid(const struct mei_me_client *me_cl)
66 {
67 	return &me_cl->props.protocol_name;
68 }
69 
70 /**
71  * mei_me_cl_ver - return me client protocol version
72  *
73  * @me_cl: me client
74  *
75  * Return: me client protocol version
76  */
mei_me_cl_ver(const struct mei_me_client * me_cl)77 static inline u8 mei_me_cl_ver(const struct mei_me_client *me_cl)
78 {
79 	return me_cl->props.protocol_version;
80 }
81 
82 /*
83  * MEI IO Functions
84  */
85 void mei_io_cb_free(struct mei_cl_cb *priv_cb);
86 
87 /*
88  * MEI Host Client Functions
89  */
90 
91 struct mei_cl *mei_cl_allocate(struct mei_device *dev);
92 
93 int mei_cl_link(struct mei_cl *cl);
94 int mei_cl_unlink(struct mei_cl *cl);
95 
96 struct mei_cl *mei_cl_alloc_linked(struct mei_device *dev);
97 
98 struct mei_cl_cb *mei_cl_read_cb(const struct mei_cl *cl,
99 				 const struct file *fp);
100 struct mei_cl_cb *mei_cl_alloc_cb(struct mei_cl *cl, size_t length,
101 				  enum mei_cb_file_ops type,
102 				  const struct file *fp);
103 struct mei_cl_cb *mei_cl_enqueue_ctrl_wr_cb(struct mei_cl *cl, size_t length,
104 					    enum mei_cb_file_ops type,
105 					    const struct file *fp);
106 int mei_cl_flush_queues(struct mei_cl *cl, const struct file *fp);
107 
108 /*
109  *  MEI input output function prototype
110  */
111 
112 /**
113  * mei_cl_is_connected - host client is connected
114  *
115  * @cl: host client
116  *
117  * Return: true if the host client is connected
118  */
mei_cl_is_connected(struct mei_cl * cl)119 static inline bool mei_cl_is_connected(struct mei_cl *cl)
120 {
121 	return  cl->state == MEI_FILE_CONNECTED;
122 }
123 
124 /**
125  * mei_cl_me_id - me client id
126  *
127  * @cl: host client
128  *
129  * Return: me client id or 0 if client is not connected
130  */
mei_cl_me_id(const struct mei_cl * cl)131 static inline u8 mei_cl_me_id(const struct mei_cl *cl)
132 {
133 	return cl->me_cl ? cl->me_cl->client_id : 0;
134 }
135 
136 /**
137  * mei_cl_mtu - maximal message that client can send and receive
138  *
139  * @cl: host client
140  *
141  * Return: mtu or 0 if client is not connected
142  */
mei_cl_mtu(const struct mei_cl * cl)143 static inline size_t mei_cl_mtu(const struct mei_cl *cl)
144 {
145 	return cl->me_cl ? cl->me_cl->props.max_msg_length : 0;
146 }
147 
148 /**
149  * mei_cl_is_fixed_address - check whether the me client uses fixed address
150  *
151  * @cl: host client
152  *
153  * Return: true if the client is connected and it has fixed me address
154  */
mei_cl_is_fixed_address(const struct mei_cl * cl)155 static inline bool mei_cl_is_fixed_address(const struct mei_cl *cl)
156 {
157 	return cl->me_cl && cl->me_cl->props.fixed_address;
158 }
159 
160 /**
161  * mei_cl_is_single_recv_buf- check whether the me client
162  *       uses single receiving buffer
163  *
164  * @cl: host client
165  *
166  * Return: true if single_recv_buf == 1; 0 otherwise
167  */
mei_cl_is_single_recv_buf(const struct mei_cl * cl)168 static inline bool mei_cl_is_single_recv_buf(const struct mei_cl *cl)
169 {
170 	return cl->me_cl->props.single_recv_buf;
171 }
172 
173 /**
174  * mei_cl_uuid -  client's uuid
175  *
176  * @cl: host client
177  *
178  * Return: return uuid of connected me client
179  */
mei_cl_uuid(const struct mei_cl * cl)180 static inline const uuid_le *mei_cl_uuid(const struct mei_cl *cl)
181 {
182 	return mei_me_cl_uuid(cl->me_cl);
183 }
184 
185 /**
186  * mei_cl_host_addr - client's host address
187  *
188  * @cl: host client
189  *
190  * Return: 0 for fixed address client, host address for dynamic client
191  */
mei_cl_host_addr(const struct mei_cl * cl)192 static inline u8 mei_cl_host_addr(const struct mei_cl *cl)
193 {
194 	return  mei_cl_is_fixed_address(cl) ? 0 : cl->host_client_id;
195 }
196 
197 int mei_cl_disconnect(struct mei_cl *cl);
198 int mei_cl_irq_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb,
199 			  struct list_head *cmpl_list);
200 int mei_cl_connect(struct mei_cl *cl, struct mei_me_client *me_cl,
201 		   const struct file *file);
202 int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb,
203 		       struct list_head *cmpl_list);
204 int mei_cl_read_start(struct mei_cl *cl, size_t length, const struct file *fp);
205 ssize_t mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb);
206 int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
207 		     struct list_head *cmpl_list);
208 
209 void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb);
210 
211 void mei_host_client_init(struct mei_device *dev);
212 
213 u8 mei_cl_notify_fop2req(enum mei_cb_file_ops fop);
214 enum mei_cb_file_ops mei_cl_notify_req2fop(u8 request);
215 int mei_cl_notify_request(struct mei_cl *cl,
216 			  const struct file *file, u8 request);
217 int mei_cl_irq_notify(struct mei_cl *cl, struct mei_cl_cb *cb,
218 		      struct list_head *cmpl_list);
219 int mei_cl_notify_get(struct mei_cl *cl, bool block, bool *notify_ev);
220 void mei_cl_notify(struct mei_cl *cl);
221 
222 void mei_cl_all_disconnect(struct mei_device *dev);
223 
224 #define MEI_CL_FMT "cl:host=%02d me=%02d "
225 #define MEI_CL_PRM(cl) (cl)->host_client_id, mei_cl_me_id(cl)
226 
227 #define cl_dbg(dev, cl, format, arg...) \
228 	dev_dbg((dev)->dev, MEI_CL_FMT format, MEI_CL_PRM(cl), ##arg)
229 
230 #define cl_warn(dev, cl, format, arg...) \
231 	dev_warn((dev)->dev, MEI_CL_FMT format, MEI_CL_PRM(cl), ##arg)
232 
233 #define cl_err(dev, cl, format, arg...) \
234 	dev_err((dev)->dev, MEI_CL_FMT format, MEI_CL_PRM(cl), ##arg)
235 
236 #endif /* _MEI_CLIENT_H_ */
237