USB: usb-storage: unusual_devs update for Super TOP SATA bridge
[linux/fpc-iii.git] / drivers / misc / sgi-xp / xp_main.c
blob01be66d02ca8ce52c84b809fa55a7aeb6b219bc2
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.
6 * Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved.
7 */
9 /*
10 * Cross Partition (XP) base.
12 * XP provides a base from which its users can interact
13 * with XPC, yet not be dependent on XPC.
17 #include <linux/module.h>
18 #include <linux/device.h>
19 #include "xp.h"
21 /* define the XP debug device structures to be used with dev_dbg() et al */
23 struct device_driver xp_dbg_name = {
24 .name = "xp"
27 struct device xp_dbg_subname = {
28 .init_name = "", /* set to "" */
29 .driver = &xp_dbg_name
32 struct device *xp = &xp_dbg_subname;
34 /* max #of partitions possible */
35 short xp_max_npartitions;
36 EXPORT_SYMBOL_GPL(xp_max_npartitions);
38 short xp_partition_id;
39 EXPORT_SYMBOL_GPL(xp_partition_id);
41 u8 xp_region_size;
42 EXPORT_SYMBOL_GPL(xp_region_size);
44 unsigned long (*xp_pa) (void *addr);
45 EXPORT_SYMBOL_GPL(xp_pa);
47 unsigned long (*xp_socket_pa) (unsigned long gpa);
48 EXPORT_SYMBOL_GPL(xp_socket_pa);
50 enum xp_retval (*xp_remote_memcpy) (unsigned long dst_gpa,
51 const unsigned long src_gpa, size_t len);
52 EXPORT_SYMBOL_GPL(xp_remote_memcpy);
54 int (*xp_cpu_to_nasid) (int cpuid);
55 EXPORT_SYMBOL_GPL(xp_cpu_to_nasid);
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);
65 * xpc_registrations[] keeps track of xpc_connect()'s done by the kernel-level
66 * users of XPC.
68 struct xpc_registration xpc_registrations[XPC_MAX_NCHANNELS];
69 EXPORT_SYMBOL_GPL(xpc_registrations);
72 * Initialize the XPC interface to indicate that XPC isn't loaded.
74 static enum xp_retval
75 xpc_notloaded(void)
77 return xpNotLoaded;
80 struct xpc_interface xpc_interface = {
81 (void (*)(int))xpc_notloaded,
82 (void (*)(int))xpc_notloaded,
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,
86 (void (*)(short, int, void *))xpc_notloaded,
87 (enum xp_retval(*)(short, void *))xpc_notloaded
89 EXPORT_SYMBOL_GPL(xpc_interface);
92 * XPC calls this when it (the XPC module) has been loaded.
94 void
95 xpc_set_interface(void (*connect) (int),
96 void (*disconnect) (int),
97 enum xp_retval (*send) (short, int, u32, void *, u16),
98 enum xp_retval (*send_notify) (short, int, u32, void *, u16,
99 xpc_notify_func, void *),
100 void (*received) (short, int, void *),
101 enum xp_retval (*partid_to_nasids) (short, void *))
103 xpc_interface.connect = connect;
104 xpc_interface.disconnect = disconnect;
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;
110 EXPORT_SYMBOL_GPL(xpc_set_interface);
113 * XPC calls this when it (the XPC module) is being unloaded.
115 void
116 xpc_clear_interface(void)
118 xpc_interface.connect = (void (*)(int))xpc_notloaded;
119 xpc_interface.disconnect = (void (*)(int))xpc_notloaded;
120 xpc_interface.send = (enum xp_retval(*)(short, int, u32, void *, u16))
121 xpc_notloaded;
122 xpc_interface.send_notify = (enum xp_retval(*)(short, int, u32, void *,
123 u16, xpc_notify_func,
124 void *))xpc_notloaded;
125 xpc_interface.received = (void (*)(short, int, void *))
126 xpc_notloaded;
127 xpc_interface.partid_to_nasids = (enum xp_retval(*)(short, void *))
128 xpc_notloaded;
130 EXPORT_SYMBOL_GPL(xpc_clear_interface);
133 * Register for automatic establishment of a channel connection whenever
134 * a partition comes up.
136 * Arguments:
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
150 * passed to the user via the xpConnected callout.
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.
156 enum xp_retval
157 xpc_connect(int ch_number, xpc_channel_func func, void *key, u16 payload_size,
158 u16 nentries, u32 assigned_limit, u32 idle_limit)
160 struct xpc_registration *registration;
162 DBUG_ON(ch_number < 0 || ch_number >= XPC_MAX_NCHANNELS);
163 DBUG_ON(payload_size == 0 || nentries == 0);
164 DBUG_ON(func == NULL);
165 DBUG_ON(assigned_limit == 0 || idle_limit > assigned_limit);
167 if (XPC_MSG_SIZE(payload_size) > XPC_MSG_MAX_SIZE)
168 return xpPayloadTooBig;
170 registration = &xpc_registrations[ch_number];
172 if (mutex_lock_interruptible(&registration->mutex) != 0)
173 return xpInterrupted;
175 /* if XPC_CHANNEL_REGISTERED(ch_number) */
176 if (registration->func != NULL) {
177 mutex_unlock(&registration->mutex);
178 return xpAlreadyRegistered;
181 /* register the channel for connection */
182 registration->entry_size = XPC_MSG_SIZE(payload_size);
183 registration->nentries = nentries;
184 registration->assigned_limit = assigned_limit;
185 registration->idle_limit = idle_limit;
186 registration->key = key;
187 registration->func = func;
189 mutex_unlock(&registration->mutex);
191 xpc_interface.connect(ch_number);
193 return xpSuccess;
195 EXPORT_SYMBOL_GPL(xpc_connect);
198 * Remove the registration for automatic connection of the specified channel
199 * when a partition comes up.
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().
206 * Arguments:
208 * ch_number - channel # to unregister.
210 void
211 xpc_disconnect(int ch_number)
213 struct xpc_registration *registration;
215 DBUG_ON(ch_number < 0 || ch_number >= XPC_MAX_NCHANNELS);
217 registration = &xpc_registrations[ch_number];
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.
224 mutex_lock(&registration->mutex);
226 /* if !XPC_CHANNEL_REGISTERED(ch_number) */
227 if (registration->func == NULL) {
228 mutex_unlock(&registration->mutex);
229 return;
232 /* remove the connection registration for the specified channel */
233 registration->func = NULL;
234 registration->key = NULL;
235 registration->nentries = 0;
236 registration->entry_size = 0;
237 registration->assigned_limit = 0;
238 registration->idle_limit = 0;
240 xpc_interface.disconnect(ch_number);
242 mutex_unlock(&registration->mutex);
244 return;
246 EXPORT_SYMBOL_GPL(xpc_disconnect);
248 int __init
249 xp_init(void)
251 enum xp_retval ret;
252 int ch_number;
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);
258 if (is_shub())
259 ret = xp_init_sn2();
260 else if (is_uv())
261 ret = xp_init_uv();
262 else
263 ret = 0;
265 if (ret != xpSuccess)
266 return ret;
268 return 0;
271 module_init(xp_init);
273 void __exit
274 xp_exit(void)
276 if (is_shub())
277 xp_exit_sn2();
278 else if (is_uv())
279 xp_exit_uv();
282 module_exit(xp_exit);
284 MODULE_AUTHOR("Silicon Graphics, Inc.");
285 MODULE_DESCRIPTION("Cross Partition (XP) base");
286 MODULE_LICENSE("GPL");