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b0d82bd5 DN |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
45d9ca49 | 6 | * Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved. |
b0d82bd5 DN |
7 | */ |
8 | ||
b0d82bd5 DN |
9 | /* |
10 | * Cross Partition (XP) base. | |
11 | * | |
12 | * XP provides a base from which its users can interact | |
13 | * with XPC, yet not be dependent on XPC. | |
14 | * | |
15 | */ | |
16 | ||
b0d82bd5 | 17 | #include <linux/module.h> |
bc63d387 | 18 | #include <linux/device.h> |
45d9ca49 | 19 | #include "xp.h" |
b0d82bd5 | 20 | |
bc63d387 | 21 | /* define the XP debug device structures to be used with dev_dbg() et al */ |
2c2b94f9 | 22 | |
bc63d387 DN |
23 | struct device_driver xp_dbg_name = { |
24 | .name = "xp" | |
25 | }; | |
26 | ||
27 | struct device xp_dbg_subname = { | |
bb0dc43e | 28 | .init_name = "", /* set to "" */ |
bc63d387 DN |
29 | .driver = &xp_dbg_name |
30 | }; | |
31 | ||
32 | struct device *xp = &xp_dbg_subname; | |
33 | ||
34 | /* max #of partitions possible */ | |
35 | short xp_max_npartitions; | |
36 | EXPORT_SYMBOL_GPL(xp_max_npartitions); | |
b0d82bd5 | 37 | |
261f3b49 DN |
38 | short xp_partition_id; |
39 | EXPORT_SYMBOL_GPL(xp_partition_id); | |
40 | ||
41 | u8 xp_region_size; | |
42 | EXPORT_SYMBOL_GPL(xp_region_size); | |
43 | ||
a812dcc3 DN |
44 | unsigned long (*xp_pa) (void *addr); |
45 | EXPORT_SYMBOL_GPL(xp_pa); | |
46 | ||
68212893 RH |
47 | unsigned long (*xp_socket_pa) (unsigned long gpa); |
48 | EXPORT_SYMBOL_GPL(xp_socket_pa); | |
49 | ||
a812dcc3 DN |
50 | enum xp_retval (*xp_remote_memcpy) (unsigned long dst_gpa, |
51 | const unsigned long src_gpa, size_t len); | |
908787db DN |
52 | EXPORT_SYMBOL_GPL(xp_remote_memcpy); |
53 | ||
261f3b49 DN |
54 | int (*xp_cpu_to_nasid) (int cpuid); |
55 | EXPORT_SYMBOL_GPL(xp_cpu_to_nasid); | |
56 | ||
6c1c325d DN |
57 | enum xp_retval (*xp_expand_memprotect) (unsigned long phys_addr, |
58 | unsigned long size); | |
59 | EXPORT_SYMBOL_GPL(xp_expand_memprotect); | |
60 | enum xp_retval (*xp_restrict_memprotect) (unsigned long phys_addr, | |
61 | unsigned long size); | |
62 | EXPORT_SYMBOL_GPL(xp_restrict_memprotect); | |
63 | ||
b0d82bd5 DN |
64 | /* |
65 | * xpc_registrations[] keeps track of xpc_connect()'s done by the kernel-level | |
66 | * users of XPC. | |
67 | */ | |
bc63d387 | 68 | struct xpc_registration xpc_registrations[XPC_MAX_NCHANNELS]; |
2c2b94f9 | 69 | EXPORT_SYMBOL_GPL(xpc_registrations); |
b0d82bd5 | 70 | |
b0d82bd5 DN |
71 | /* |
72 | * Initialize the XPC interface to indicate that XPC isn't loaded. | |
73 | */ | |
65c17b80 | 74 | static enum xp_retval |
4a3ad2dd DN |
75 | xpc_notloaded(void) |
76 | { | |
65c17b80 | 77 | return xpNotLoaded; |
4a3ad2dd | 78 | } |
b0d82bd5 DN |
79 | |
80 | struct xpc_interface xpc_interface = { | |
4a3ad2dd DN |
81 | (void (*)(int))xpc_notloaded, |
82 | (void (*)(int))xpc_notloaded, | |
97bf1aa1 DN |
83 | (enum xp_retval(*)(short, int, u32, void *, u16))xpc_notloaded, |
84 | (enum xp_retval(*)(short, int, u32, void *, u16, xpc_notify_func, | |
85 | void *))xpc_notloaded, | |
64d032ba DN |
86 | (void (*)(short, int, void *))xpc_notloaded, |
87 | (enum xp_retval(*)(short, void *))xpc_notloaded | |
b0d82bd5 | 88 | }; |
2c2b94f9 | 89 | EXPORT_SYMBOL_GPL(xpc_interface); |
b0d82bd5 | 90 | |
b0d82bd5 DN |
91 | /* |
92 | * XPC calls this when it (the XPC module) has been loaded. | |
93 | */ | |
94 | void | |
4a3ad2dd DN |
95 | xpc_set_interface(void (*connect) (int), |
96 | void (*disconnect) (int), | |
97bf1aa1 DN |
97 | enum xp_retval (*send) (short, int, u32, void *, u16), |
98 | enum xp_retval (*send_notify) (short, int, u32, void *, u16, | |
4a3ad2dd | 99 | xpc_notify_func, void *), |
64d032ba DN |
100 | void (*received) (short, int, void *), |
101 | enum xp_retval (*partid_to_nasids) (short, void *)) | |
b0d82bd5 DN |
102 | { |
103 | xpc_interface.connect = connect; | |
104 | xpc_interface.disconnect = disconnect; | |
b0d82bd5 DN |
105 | xpc_interface.send = send; |
106 | xpc_interface.send_notify = send_notify; | |
107 | xpc_interface.received = received; | |
108 | xpc_interface.partid_to_nasids = partid_to_nasids; | |
109 | } | |
2c2b94f9 | 110 | EXPORT_SYMBOL_GPL(xpc_set_interface); |
b0d82bd5 | 111 | |
b0d82bd5 DN |
112 | /* |
113 | * XPC calls this when it (the XPC module) is being unloaded. | |
114 | */ | |
115 | void | |
116 | xpc_clear_interface(void) | |
117 | { | |
4a3ad2dd DN |
118 | xpc_interface.connect = (void (*)(int))xpc_notloaded; |
119 | xpc_interface.disconnect = (void (*)(int))xpc_notloaded; | |
97bf1aa1 | 120 | xpc_interface.send = (enum xp_retval(*)(short, int, u32, void *, u16)) |
4a3ad2dd | 121 | xpc_notloaded; |
97bf1aa1 DN |
122 | xpc_interface.send_notify = (enum xp_retval(*)(short, int, u32, void *, |
123 | u16, xpc_notify_func, | |
124 | void *))xpc_notloaded; | |
64d032ba | 125 | xpc_interface.received = (void (*)(short, int, void *)) |
4a3ad2dd | 126 | xpc_notloaded; |
64d032ba | 127 | xpc_interface.partid_to_nasids = (enum xp_retval(*)(short, void *)) |
4a3ad2dd | 128 | xpc_notloaded; |
b0d82bd5 | 129 | } |
2c2b94f9 | 130 | EXPORT_SYMBOL_GPL(xpc_clear_interface); |
b0d82bd5 | 131 | |
b0d82bd5 DN |
132 | /* |
133 | * Register for automatic establishment of a channel connection whenever | |
134 | * a partition comes up. | |
135 | * | |
136 | * Arguments: | |
137 | * | |
138 | * ch_number - channel # to register for connection. | |
139 | * func - function to call for asynchronous notification of channel | |
140 | * state changes (i.e., connection, disconnection, error) and | |
141 | * the arrival of incoming messages. | |
142 | * key - pointer to optional user-defined value that gets passed back | |
143 | * to the user on any callouts made to func. | |
144 | * payload_size - size in bytes of the XPC message's payload area which | |
145 | * contains a user-defined message. The user should make | |
146 | * this large enough to hold their largest message. | |
147 | * nentries - max #of XPC message entries a message queue can contain. | |
148 | * The actual number, which is determined when a connection | |
149 | * is established and may be less then requested, will be | |
65c17b80 | 150 | * passed to the user via the xpConnected callout. |
b0d82bd5 DN |
151 | * assigned_limit - max number of kthreads allowed to be processing |
152 | * messages (per connection) at any given instant. | |
153 | * idle_limit - max number of kthreads allowed to be idle at any given | |
154 | * instant. | |
155 | */ | |
65c17b80 | 156 | enum xp_retval |
b0d82bd5 | 157 | xpc_connect(int ch_number, xpc_channel_func func, void *key, u16 payload_size, |
4a3ad2dd | 158 | u16 nentries, u32 assigned_limit, u32 idle_limit) |
b0d82bd5 DN |
159 | { |
160 | struct xpc_registration *registration; | |
161 | ||
bc63d387 | 162 | DBUG_ON(ch_number < 0 || ch_number >= XPC_MAX_NCHANNELS); |
b0d82bd5 DN |
163 | DBUG_ON(payload_size == 0 || nentries == 0); |
164 | DBUG_ON(func == NULL); | |
165 | DBUG_ON(assigned_limit == 0 || idle_limit > assigned_limit); | |
166 | ||
bd3e64c1 DN |
167 | if (XPC_MSG_SIZE(payload_size) > XPC_MSG_MAX_SIZE) |
168 | return xpPayloadTooBig; | |
169 | ||
b0d82bd5 DN |
170 | registration = &xpc_registrations[ch_number]; |
171 | ||
2c2b94f9 | 172 | if (mutex_lock_interruptible(®istration->mutex) != 0) |
65c17b80 | 173 | return xpInterrupted; |
b0d82bd5 DN |
174 | |
175 | /* if XPC_CHANNEL_REGISTERED(ch_number) */ | |
176 | if (registration->func != NULL) { | |
f9e505a9 | 177 | mutex_unlock(®istration->mutex); |
65c17b80 | 178 | return xpAlreadyRegistered; |
b0d82bd5 DN |
179 | } |
180 | ||
181 | /* register the channel for connection */ | |
bd3e64c1 | 182 | registration->entry_size = XPC_MSG_SIZE(payload_size); |
b0d82bd5 DN |
183 | registration->nentries = nentries; |
184 | registration->assigned_limit = assigned_limit; | |
185 | registration->idle_limit = idle_limit; | |
186 | registration->key = key; | |
187 | registration->func = func; | |
188 | ||
f9e505a9 | 189 | mutex_unlock(®istration->mutex); |
b0d82bd5 DN |
190 | |
191 | xpc_interface.connect(ch_number); | |
192 | ||
65c17b80 | 193 | return xpSuccess; |
b0d82bd5 | 194 | } |
2c2b94f9 | 195 | EXPORT_SYMBOL_GPL(xpc_connect); |
b0d82bd5 | 196 | |
b0d82bd5 DN |
197 | /* |
198 | * Remove the registration for automatic connection of the specified channel | |
199 | * when a partition comes up. | |
200 | * | |
201 | * Before returning this xpc_disconnect() will wait for all connections on the | |
202 | * specified channel have been closed/torndown. So the caller can be assured | |
203 | * that they will not be receiving any more callouts from XPC to their | |
204 | * function registered via xpc_connect(). | |
205 | * | |
206 | * Arguments: | |
207 | * | |
208 | * ch_number - channel # to unregister. | |
209 | */ | |
210 | void | |
211 | xpc_disconnect(int ch_number) | |
212 | { | |
213 | struct xpc_registration *registration; | |
214 | ||
bc63d387 | 215 | DBUG_ON(ch_number < 0 || ch_number >= XPC_MAX_NCHANNELS); |
b0d82bd5 DN |
216 | |
217 | registration = &xpc_registrations[ch_number]; | |
218 | ||
219 | /* | |
220 | * We've decided not to make this a down_interruptible(), since we | |
221 | * figured XPC's users will just turn around and call xpc_disconnect() | |
222 | * again anyways, so we might as well wait, if need be. | |
223 | */ | |
f9e505a9 | 224 | mutex_lock(®istration->mutex); |
b0d82bd5 DN |
225 | |
226 | /* if !XPC_CHANNEL_REGISTERED(ch_number) */ | |
227 | if (registration->func == NULL) { | |
f9e505a9 | 228 | mutex_unlock(®istration->mutex); |
b0d82bd5 DN |
229 | return; |
230 | } | |
231 | ||
232 | /* remove the connection registration for the specified channel */ | |
233 | registration->func = NULL; | |
234 | registration->key = NULL; | |
235 | registration->nentries = 0; | |
bd3e64c1 | 236 | registration->entry_size = 0; |
b0d82bd5 DN |
237 | registration->assigned_limit = 0; |
238 | registration->idle_limit = 0; | |
239 | ||
240 | xpc_interface.disconnect(ch_number); | |
241 | ||
f9e505a9 | 242 | mutex_unlock(®istration->mutex); |
b0d82bd5 DN |
243 | |
244 | return; | |
245 | } | |
2c2b94f9 | 246 | EXPORT_SYMBOL_GPL(xpc_disconnect); |
b0d82bd5 | 247 | |
b0d82bd5 DN |
248 | int __init |
249 | xp_init(void) | |
250 | { | |
bc63d387 DN |
251 | enum xp_retval ret; |
252 | int ch_number; | |
b0d82bd5 | 253 | |
e873cff0 RH |
254 | /* initialize the connection registration mutex */ |
255 | for (ch_number = 0; ch_number < XPC_MAX_NCHANNELS; ch_number++) | |
256 | mutex_init(&xpc_registrations[ch_number].mutex); | |
257 | ||
bc63d387 DN |
258 | if (is_shub()) |
259 | ret = xp_init_sn2(); | |
260 | else if (is_uv()) | |
261 | ret = xp_init_uv(); | |
2c2b94f9 | 262 | else |
e873cff0 | 263 | ret = 0; |
bc63d387 DN |
264 | |
265 | if (ret != xpSuccess) | |
e873cff0 | 266 | return ret; |
b0d82bd5 DN |
267 | |
268 | return 0; | |
269 | } | |
b0d82bd5 | 270 | |
4a3ad2dd | 271 | module_init(xp_init); |
b0d82bd5 DN |
272 | |
273 | void __exit | |
274 | xp_exit(void) | |
275 | { | |
bc63d387 DN |
276 | if (is_shub()) |
277 | xp_exit_sn2(); | |
278 | else if (is_uv()) | |
279 | xp_exit_uv(); | |
b0d82bd5 | 280 | } |
b0d82bd5 | 281 | |
4a3ad2dd | 282 | module_exit(xp_exit); |
b0d82bd5 DN |
283 | |
284 | MODULE_AUTHOR("Silicon Graphics, Inc."); | |
285 | MODULE_DESCRIPTION("Cross Partition (XP) base"); | |
286 | MODULE_LICENSE("GPL"); |