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89eb8eb9 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. |
89eb8eb9 DN |
7 | */ |
8 | ||
89eb8eb9 DN |
9 | /* |
10 | * Cross Partition Communication (XPC) structures and macros. | |
11 | */ | |
12 | ||
45d9ca49 DN |
13 | #ifndef _DRIVERS_MISC_SGIXP_XPC_H |
14 | #define _DRIVERS_MISC_SGIXP_XPC_H | |
89eb8eb9 | 15 | |
89eb8eb9 DN |
16 | #include <linux/interrupt.h> |
17 | #include <linux/sysctl.h> | |
18 | #include <linux/device.h> | |
f9e505a9 JS |
19 | #include <linux/mutex.h> |
20 | #include <linux/completion.h> | |
89eb8eb9 DN |
21 | #include <asm/pgtable.h> |
22 | #include <asm/processor.h> | |
89eb8eb9 DN |
23 | #include <asm/sn/clksupport.h> |
24 | #include <asm/sn/addrs.h> | |
25 | #include <asm/sn/mspec.h> | |
26 | #include <asm/sn/shub_mmr.h> | |
45d9ca49 | 27 | #include "xp.h" |
89eb8eb9 | 28 | |
89eb8eb9 DN |
29 | /* |
30 | * XPC Version numbers consist of a major and minor number. XPC can always | |
31 | * talk to versions with same major #, and never talk to versions with a | |
32 | * different major #. | |
33 | */ | |
34 | #define _XPC_VERSION(_maj, _min) (((_maj) << 4) | ((_min) & 0xf)) | |
35 | #define XPC_VERSION_MAJOR(_v) ((_v) >> 4) | |
36 | #define XPC_VERSION_MINOR(_v) ((_v) & 0xf) | |
37 | ||
89eb8eb9 DN |
38 | /* |
39 | * The next macros define word or bit representations for given | |
40 | * C-brick nasid in either the SAL provided bit array representing | |
c39838ce DN |
41 | * nasids in the partition/machine or the array of amo structures used |
42 | * for inter-partition initiation communications. | |
89eb8eb9 DN |
43 | * |
44 | * For SN2 machines, C-Bricks are alway even numbered NASIDs. As | |
45 | * such, some space will be saved by insisting that nasid information | |
46 | * passed from SAL always be packed for C-Bricks and the | |
47 | * cross-partition interrupts use the same packing scheme. | |
48 | */ | |
49 | #define XPC_NASID_W_INDEX(_n) (((_n) / 64) / 2) | |
50 | #define XPC_NASID_B_INDEX(_n) (((_n) / 2) & (64 - 1)) | |
51 | #define XPC_NASID_IN_ARRAY(_n, _p) ((_p)[XPC_NASID_W_INDEX(_n)] & \ | |
52 | (1UL << XPC_NASID_B_INDEX(_n))) | |
53 | #define XPC_NASID_FROM_W_B(_w, _b) (((_w) * 64 + (_b)) * 2) | |
54 | ||
55 | #define XPC_HB_DEFAULT_INTERVAL 5 /* incr HB every x secs */ | |
a607c389 | 56 | #define XPC_HB_CHECK_DEFAULT_INTERVAL 20 /* check HB every x secs */ |
89eb8eb9 DN |
57 | |
58 | /* define the process name of HB checker and the CPU it is pinned to */ | |
59 | #define XPC_HB_CHECK_THREAD_NAME "xpc_hb" | |
60 | #define XPC_HB_CHECK_CPU 0 | |
61 | ||
62 | /* define the process name of the discovery thread */ | |
63 | #define XPC_DISCOVERY_THREAD_NAME "xpc_discovery" | |
64 | ||
89eb8eb9 | 65 | /* |
4b38fcd4 | 66 | * the reserved page |
89eb8eb9 | 67 | * |
4b38fcd4 DN |
68 | * SAL reserves one page of memory per partition for XPC. Though a full page |
69 | * in length (16384 bytes), its starting address is not page aligned, but it | |
70 | * is cacheline aligned. The reserved page consists of the following: | |
71 | * | |
72 | * reserved page header | |
73 | * | |
94bd2708 DN |
74 | * The first two 64-byte cachelines of the reserved page contain the |
75 | * header (struct xpc_rsvd_page). Before SAL initialization has completed, | |
4b38fcd4 | 76 | * SAL has set up the following fields of the reserved page header: |
94bd2708 DN |
77 | * SAL_signature, SAL_version, SAL_partid, and SAL_nasids_size. The |
78 | * other fields are set up by XPC. (xpc_rsvd_page points to the local | |
4b38fcd4 | 79 | * partition's reserved page.) |
89eb8eb9 | 80 | * |
4b38fcd4 DN |
81 | * part_nasids mask |
82 | * mach_nasids mask | |
83 | * | |
84 | * SAL also sets up two bitmaps (or masks), one that reflects the actual | |
85 | * nasids in this partition (part_nasids), and the other that reflects | |
86 | * the actual nasids in the entire machine (mach_nasids). We're only | |
87 | * interested in the even numbered nasids (which contain the processors | |
88 | * and/or memory), so we only need half as many bits to represent the | |
89 | * nasids. The part_nasids mask is located starting at the first cacheline | |
90 | * following the reserved page header. The mach_nasids mask follows right | |
91 | * after the part_nasids mask. The size in bytes of each mask is reflected | |
94bd2708 | 92 | * by the reserved page header field 'SAL_nasids_size'. (Local partition's |
4b38fcd4 DN |
93 | * mask pointers are xpc_part_nasids and xpc_mach_nasids.) |
94 | * | |
94bd2708 DN |
95 | * vars (ia64-sn2 only) |
96 | * vars part (ia64-sn2 only) | |
4b38fcd4 DN |
97 | * |
98 | * Immediately following the mach_nasids mask are the XPC variables | |
99 | * required by other partitions. First are those that are generic to all | |
100 | * partitions (vars), followed on the next available cacheline by those | |
101 | * which are partition specific (vars part). These are setup by XPC. | |
102 | * (Local partition's vars pointers are xpc_vars and xpc_vars_part.) | |
89eb8eb9 | 103 | * |
94bd2708 DN |
104 | * Note: Until 'stamp' is set non-zero, the partition XPC code has not been |
105 | * initialized. | |
89eb8eb9 DN |
106 | */ |
107 | struct xpc_rsvd_page { | |
4b38fcd4 DN |
108 | u64 SAL_signature; /* SAL: unique signature */ |
109 | u64 SAL_version; /* SAL: version */ | |
94bd2708 DN |
110 | short SAL_partid; /* SAL: partition ID */ |
111 | short max_npartitions; /* value of XPC_MAX_PARTITIONS */ | |
89eb8eb9 | 112 | u8 version; |
94bd2708 DN |
113 | u8 pad1[3]; /* align to next u64 in 1st 64-byte cacheline */ |
114 | union { | |
115 | u64 vars_pa; /* physical address of struct xpc_vars */ | |
116 | u64 activate_mq_gpa; /* global phys address of activate_mq */ | |
117 | } sn; | |
aaa3cd69 DN |
118 | unsigned long stamp; /* time when reserved page was setup by XPC */ |
119 | u64 pad2[10]; /* align to last u64 in 2nd 64-byte cacheline */ | |
94bd2708 | 120 | u64 SAL_nasids_size; /* SAL: size of each nasid mask in bytes */ |
89eb8eb9 | 121 | }; |
89eb8eb9 | 122 | |
94bd2708 | 123 | #define XPC_RP_VERSION _XPC_VERSION(2, 0) /* version 2.0 of the reserved page */ |
a607c389 | 124 | |
89eb8eb9 DN |
125 | /* |
126 | * Define the structures by which XPC variables can be exported to other | |
127 | * partitions. (There are two: struct xpc_vars and struct xpc_vars_part) | |
128 | */ | |
129 | ||
130 | /* | |
131 | * The following structure describes the partition generic variables | |
132 | * needed by other partitions in order to properly initialize. | |
133 | * | |
134 | * struct xpc_vars version number also applies to struct xpc_vars_part. | |
135 | * Changes to either structure and/or related functionality should be | |
136 | * reflected by incrementing either the major or minor version numbers | |
137 | * of struct xpc_vars. | |
138 | */ | |
33ba3c77 | 139 | struct xpc_vars_sn2 { |
89eb8eb9 DN |
140 | u8 version; |
141 | u64 heartbeat; | |
33ba3c77 | 142 | DECLARE_BITMAP(heartbeating_to_mask, XP_MAX_NPARTITIONS_SN2); |
780d09e8 | 143 | u64 heartbeat_offline; /* if 0, heartbeat should be changing */ |
a47d5dac DN |
144 | int activate_IRQ_nasid; |
145 | int activate_IRQ_phys_cpuid; | |
89eb8eb9 | 146 | u64 vars_part_pa; |
c39838ce DN |
147 | u64 amos_page_pa; /* paddr of page of amos from MSPEC driver */ |
148 | struct amo *amos_page; /* vaddr of page of amos from MSPEC driver */ | |
89eb8eb9 | 149 | }; |
89eb8eb9 | 150 | |
2c2b94f9 | 151 | #define XPC_V_VERSION _XPC_VERSION(3, 1) /* version 3.1 of the cross vars */ |
a607c389 | 152 | |
89eb8eb9 DN |
153 | /* |
154 | * The following structure describes the per partition specific variables. | |
155 | * | |
156 | * An array of these structures, one per partition, will be defined. As a | |
157 | * partition becomes active XPC will copy the array entry corresponding to | |
94bd2708 DN |
158 | * itself from that partition. It is desirable that the size of this structure |
159 | * evenly divides into a 128-byte cacheline, such that none of the entries in | |
160 | * this array crosses a 128-byte cacheline boundary. As it is now, each entry | |
e17d416b | 161 | * occupies 64-bytes. |
89eb8eb9 | 162 | */ |
e17d416b | 163 | struct xpc_vars_part_sn2 { |
2c2b94f9 | 164 | u64 magic; |
89eb8eb9 DN |
165 | |
166 | u64 openclose_args_pa; /* physical address of open and close args */ | |
167 | u64 GPs_pa; /* physical address of Get/Put values */ | |
168 | ||
c39838ce | 169 | u64 chctl_amo_pa; /* physical address of chctl flags' amo */ |
7fb5e59d DN |
170 | |
171 | int notify_IRQ_nasid; /* nasid of where to send notify IRQs */ | |
172 | int notify_IRQ_phys_cpuid; /* CPUID of where to send notify IRQs */ | |
89eb8eb9 DN |
173 | |
174 | u8 nchannels; /* #of defined channels supported */ | |
175 | ||
176 | u8 reserved[23]; /* pad to a full 64 bytes */ | |
177 | }; | |
178 | ||
179 | /* | |
180 | * The vars_part MAGIC numbers play a part in the first contact protocol. | |
181 | * | |
182 | * MAGIC1 indicates that the per partition specific variables for a remote | |
183 | * partition have been initialized by this partition. | |
184 | * | |
185 | * MAGIC2 indicates that this partition has pulled the remote partititions | |
186 | * per partition variables that pertain to this partition. | |
187 | */ | |
2c2b94f9 DN |
188 | #define XPC_VP_MAGIC1 0x0053524156435058L /* 'XPCVARS\0'L (little endian) */ |
189 | #define XPC_VP_MAGIC2 0x0073726176435058L /* 'XPCvars\0'L (little endian) */ | |
89eb8eb9 | 190 | |
4b38fcd4 DN |
191 | /* the reserved page sizes and offsets */ |
192 | ||
193 | #define XPC_RP_HEADER_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_rsvd_page)) | |
33ba3c77 | 194 | #define XPC_RP_VARS_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_vars_sn2)) |
4b38fcd4 | 195 | |
2c2b94f9 | 196 | #define XPC_RP_PART_NASIDS(_rp) ((u64 *)((u8 *)(_rp) + XPC_RP_HEADER_SIZE)) |
ee6665e3 DN |
197 | #define XPC_RP_MACH_NASIDS(_rp) (XPC_RP_PART_NASIDS(_rp) + xpc_nasid_mask_words) |
198 | #define XPC_RP_VARS(_rp) ((struct xpc_vars_sn2 *) \ | |
199 | (XPC_RP_MACH_NASIDS(_rp) + \ | |
200 | xpc_nasid_mask_words)) | |
4b38fcd4 | 201 | |
89eb8eb9 DN |
202 | /* |
203 | * Functions registered by add_timer() or called by kernel_thread() only | |
204 | * allow for a single 64-bit argument. The following macros can be used to | |
205 | * pack and unpack two (32-bit, 16-bit or 8-bit) arguments into or out from | |
206 | * the passed argument. | |
207 | */ | |
208 | #define XPC_PACK_ARGS(_arg1, _arg2) \ | |
ee6665e3 DN |
209 | ((((u64)_arg1) & 0xffffffff) | \ |
210 | ((((u64)_arg2) & 0xffffffff) << 32)) | |
89eb8eb9 | 211 | |
ee6665e3 DN |
212 | #define XPC_UNPACK_ARG1(_args) (((u64)_args) & 0xffffffff) |
213 | #define XPC_UNPACK_ARG2(_args) ((((u64)_args) >> 32) & 0xffffffff) | |
89eb8eb9 | 214 | |
89eb8eb9 DN |
215 | /* |
216 | * Define a Get/Put value pair (pointers) used with a message queue. | |
217 | */ | |
218 | struct xpc_gp { | |
2c2b94f9 DN |
219 | s64 get; /* Get value */ |
220 | s64 put; /* Put value */ | |
89eb8eb9 DN |
221 | }; |
222 | ||
223 | #define XPC_GP_SIZE \ | |
bc63d387 | 224 | L1_CACHE_ALIGN(sizeof(struct xpc_gp) * XPC_MAX_NCHANNELS) |
89eb8eb9 | 225 | |
89eb8eb9 DN |
226 | /* |
227 | * Define a structure that contains arguments associated with opening and | |
228 | * closing a channel. | |
229 | */ | |
230 | struct xpc_openclose_args { | |
231 | u16 reason; /* reason why channel is closing */ | |
232 | u16 msg_size; /* sizeof each message entry */ | |
233 | u16 remote_nentries; /* #of message entries in remote msg queue */ | |
234 | u16 local_nentries; /* #of message entries in local msg queue */ | |
235 | u64 local_msgqueue_pa; /* physical address of local message queue */ | |
236 | }; | |
237 | ||
238 | #define XPC_OPENCLOSE_ARGS_SIZE \ | |
bc63d387 DN |
239 | L1_CACHE_ALIGN(sizeof(struct xpc_openclose_args) * \ |
240 | XPC_MAX_NCHANNELS) | |
89eb8eb9 | 241 | |
89eb8eb9 DN |
242 | /* struct xpc_msg flags */ |
243 | ||
244 | #define XPC_M_DONE 0x01 /* msg has been received/consumed */ | |
245 | #define XPC_M_READY 0x02 /* msg is ready to be sent */ | |
246 | #define XPC_M_INTERRUPT 0x04 /* send interrupt when msg consumed */ | |
247 | ||
89eb8eb9 DN |
248 | #define XPC_MSG_ADDRESS(_payload) \ |
249 | ((struct xpc_msg *)((u8 *)(_payload) - XPC_MSG_PAYLOAD_OFFSET)) | |
250 | ||
89eb8eb9 DN |
251 | /* |
252 | * Defines notify entry. | |
253 | * | |
254 | * This is used to notify a message's sender that their message was received | |
255 | * and consumed by the intended recipient. | |
256 | */ | |
257 | struct xpc_notify { | |
2c2b94f9 | 258 | u8 type; /* type of notification */ |
89eb8eb9 DN |
259 | |
260 | /* the following two fields are only used if type == XPC_N_CALL */ | |
4a3ad2dd DN |
261 | xpc_notify_func func; /* user's notify function */ |
262 | void *key; /* pointer to user's key */ | |
89eb8eb9 DN |
263 | }; |
264 | ||
265 | /* struct xpc_notify type of notification */ | |
266 | ||
267 | #define XPC_N_CALL 0x01 /* notify function provided by user */ | |
268 | ||
89eb8eb9 DN |
269 | /* |
270 | * Define the structure that manages all the stuff required by a channel. In | |
271 | * particular, they are used to manage the messages sent across the channel. | |
272 | * | |
273 | * This structure is private to a partition, and is NOT shared across the | |
274 | * partition boundary. | |
275 | * | |
276 | * There is an array of these structures for each remote partition. It is | |
277 | * allocated at the time a partition becomes active. The array contains one | |
278 | * of these structures for each potential channel connection to that partition. | |
ea57f80c DN |
279 | */ |
280 | ||
281 | /* | |
282 | * The following is sn2 only. | |
89eb8eb9 | 283 | * |
ea57f80c | 284 | * Each channel structure manages two message queues (circular buffers). |
89eb8eb9 DN |
285 | * They are allocated at the time a channel connection is made. One of |
286 | * these message queues (local_msgqueue) holds the locally created messages | |
287 | * that are destined for the remote partition. The other of these message | |
288 | * queues (remote_msgqueue) is a locally cached copy of the remote partition's | |
289 | * own local_msgqueue. | |
290 | * | |
291 | * The following is a description of the Get/Put pointers used to manage these | |
292 | * two message queues. Consider the local_msgqueue to be on one partition | |
293 | * and the remote_msgqueue to be its cached copy on another partition. A | |
294 | * description of what each of the lettered areas contains is included. | |
295 | * | |
296 | * | |
297 | * local_msgqueue remote_msgqueue | |
298 | * | |
299 | * |/////////| |/////////| | |
300 | * w_remote_GP.get --> +---------+ |/////////| | |
301 | * | F | |/////////| | |
302 | * remote_GP.get --> +---------+ +---------+ <-- local_GP->get | |
303 | * | | | | | |
304 | * | | | E | | |
305 | * | | | | | |
306 | * | | +---------+ <-- w_local_GP.get | |
307 | * | B | |/////////| | |
308 | * | | |////D////| | |
309 | * | | |/////////| | |
310 | * | | +---------+ <-- w_remote_GP.put | |
311 | * | | |////C////| | |
312 | * local_GP->put --> +---------+ +---------+ <-- remote_GP.put | |
313 | * | | |/////////| | |
314 | * | A | |/////////| | |
315 | * | | |/////////| | |
316 | * w_local_GP.put --> +---------+ |/////////| | |
317 | * |/////////| |/////////| | |
318 | * | |
319 | * | |
320 | * ( remote_GP.[get|put] are cached copies of the remote | |
321 | * partition's local_GP->[get|put], and thus their values can | |
322 | * lag behind their counterparts on the remote partition. ) | |
323 | * | |
324 | * | |
325 | * A - Messages that have been allocated, but have not yet been sent to the | |
326 | * remote partition. | |
327 | * | |
328 | * B - Messages that have been sent, but have not yet been acknowledged by the | |
329 | * remote partition as having been received. | |
330 | * | |
331 | * C - Area that needs to be prepared for the copying of sent messages, by | |
332 | * the clearing of the message flags of any previously received messages. | |
333 | * | |
334 | * D - Area into which sent messages are to be copied from the remote | |
335 | * partition's local_msgqueue and then delivered to their intended | |
336 | * recipients. [ To allow for a multi-message copy, another pointer | |
337 | * (next_msg_to_pull) has been added to keep track of the next message | |
338 | * number needing to be copied (pulled). It chases after w_remote_GP.put. | |
339 | * Any messages lying between w_local_GP.get and next_msg_to_pull have | |
340 | * been copied and are ready to be delivered. ] | |
341 | * | |
342 | * E - Messages that have been copied and delivered, but have not yet been | |
343 | * acknowledged by the recipient as having been received. | |
344 | * | |
345 | * F - Messages that have been acknowledged, but XPC has not yet notified the | |
346 | * sender that the message was received by its intended recipient. | |
347 | * This is also an area that needs to be prepared for the allocating of | |
348 | * new messages, by the clearing of the message flags of the acknowledged | |
349 | * messages. | |
350 | */ | |
ea57f80c | 351 | |
a47d5dac DN |
352 | struct xpc_channel_sn2 { |
353 | ||
354 | /* various flavors of local and remote Get/Put values */ | |
355 | ||
356 | struct xpc_gp *local_GP; /* local Get/Put values */ | |
357 | struct xpc_gp remote_GP; /* remote Get/Put values */ | |
358 | struct xpc_gp w_local_GP; /* working local Get/Put values */ | |
359 | struct xpc_gp w_remote_GP; /* working remote Get/Put values */ | |
360 | s64 next_msg_to_pull; /* Put value of next msg to pull */ | |
361 | ||
362 | struct mutex msg_to_pull_mutex; /* next msg to pull serialization */ | |
363 | }; | |
364 | ||
365 | struct xpc_channel_uv { | |
ea57f80c | 366 | /* !!! code is coming */ |
a47d5dac DN |
367 | }; |
368 | ||
89eb8eb9 | 369 | struct xpc_channel { |
64d032ba | 370 | short partid; /* ID of remote partition connected */ |
4a3ad2dd DN |
371 | spinlock_t lock; /* lock for updating this structure */ |
372 | u32 flags; /* general flags */ | |
89eb8eb9 | 373 | |
65c17b80 | 374 | enum xp_retval reason; /* reason why channel is disconnect'g */ |
4a3ad2dd | 375 | int reason_line; /* line# disconnect initiated from */ |
89eb8eb9 | 376 | |
4a3ad2dd | 377 | u16 number; /* channel # */ |
89eb8eb9 | 378 | |
4a3ad2dd DN |
379 | u16 msg_size; /* sizeof each msg entry */ |
380 | u16 local_nentries; /* #of msg entries in local msg queue */ | |
381 | u16 remote_nentries; /* #of msg entries in remote msg queue */ | |
89eb8eb9 DN |
382 | |
383 | void *local_msgqueue_base; /* base address of kmalloc'd space */ | |
384 | struct xpc_msg *local_msgqueue; /* local message queue */ | |
385 | void *remote_msgqueue_base; /* base address of kmalloc'd space */ | |
2c2b94f9 DN |
386 | struct xpc_msg *remote_msgqueue; /* cached copy of remote partition's */ |
387 | /* local message queue */ | |
4a3ad2dd DN |
388 | u64 remote_msgqueue_pa; /* phys addr of remote partition's */ |
389 | /* local message queue */ | |
89eb8eb9 | 390 | |
4a3ad2dd | 391 | atomic_t references; /* #of external references to queues */ |
89eb8eb9 | 392 | |
4a3ad2dd DN |
393 | atomic_t n_on_msg_allocate_wq; /* #on msg allocation wait queue */ |
394 | wait_queue_head_t msg_allocate_wq; /* msg allocation wait queue */ | |
89eb8eb9 | 395 | |
7fb5e59d | 396 | u8 delayed_chctl_flags; /* chctl flags received, but delayed */ |
4a3ad2dd | 397 | /* action until channel disconnected */ |
e54af724 | 398 | |
89eb8eb9 DN |
399 | /* queue of msg senders who want to be notified when msg received */ |
400 | ||
4a3ad2dd | 401 | atomic_t n_to_notify; /* #of msg senders to notify */ |
2c2b94f9 | 402 | struct xpc_notify *notify_queue; /* notify queue for messages sent */ |
89eb8eb9 | 403 | |
4a3ad2dd DN |
404 | xpc_channel_func func; /* user's channel function */ |
405 | void *key; /* pointer to user's key */ | |
89eb8eb9 | 406 | |
2c2b94f9 | 407 | struct completion wdisconnect_wait; /* wait for channel disconnect */ |
89eb8eb9 | 408 | |
2c2b94f9 DN |
409 | struct xpc_openclose_args *local_openclose_args; /* args passed on */ |
410 | /* opening or closing of channel */ | |
89eb8eb9 | 411 | |
89eb8eb9 DN |
412 | /* kthread management related fields */ |
413 | ||
89eb8eb9 | 414 | atomic_t kthreads_assigned; /* #of kthreads assigned to channel */ |
4a3ad2dd DN |
415 | u32 kthreads_assigned_limit; /* limit on #of kthreads assigned */ |
416 | atomic_t kthreads_idle; /* #of kthreads idle waiting for work */ | |
89eb8eb9 DN |
417 | u32 kthreads_idle_limit; /* limit on #of kthreads idle */ |
418 | atomic_t kthreads_active; /* #of kthreads actively working */ | |
89eb8eb9 DN |
419 | |
420 | wait_queue_head_t idle_wq; /* idle kthread wait queue */ | |
421 | ||
a47d5dac DN |
422 | union { |
423 | struct xpc_channel_sn2 sn2; | |
424 | struct xpc_channel_uv uv; | |
425 | } sn; | |
426 | ||
89eb8eb9 DN |
427 | } ____cacheline_aligned; |
428 | ||
89eb8eb9 DN |
429 | /* struct xpc_channel flags */ |
430 | ||
4a3ad2dd | 431 | #define XPC_C_WASCONNECTED 0x00000001 /* channel was connected */ |
89eb8eb9 | 432 | |
4a3ad2dd DN |
433 | #define XPC_C_ROPENREPLY 0x00000002 /* remote open channel reply */ |
434 | #define XPC_C_OPENREPLY 0x00000004 /* local open channel reply */ | |
2c2b94f9 | 435 | #define XPC_C_ROPENREQUEST 0x00000008 /* remote open channel request */ |
4a3ad2dd | 436 | #define XPC_C_OPENREQUEST 0x00000010 /* local open channel request */ |
89eb8eb9 | 437 | |
2c2b94f9 DN |
438 | #define XPC_C_SETUP 0x00000020 /* channel's msgqueues are alloc'd */ |
439 | #define XPC_C_CONNECTEDCALLOUT 0x00000040 /* connected callout initiated */ | |
4c2cd966 | 440 | #define XPC_C_CONNECTEDCALLOUT_MADE \ |
2c2b94f9 | 441 | 0x00000080 /* connected callout completed */ |
4a3ad2dd DN |
442 | #define XPC_C_CONNECTED 0x00000100 /* local channel is connected */ |
443 | #define XPC_C_CONNECTING 0x00000200 /* channel is being connected */ | |
4c2cd966 | 444 | |
4a3ad2dd DN |
445 | #define XPC_C_RCLOSEREPLY 0x00000400 /* remote close channel reply */ |
446 | #define XPC_C_CLOSEREPLY 0x00000800 /* local close channel reply */ | |
2c2b94f9 DN |
447 | #define XPC_C_RCLOSEREQUEST 0x00001000 /* remote close channel request */ |
448 | #define XPC_C_CLOSEREQUEST 0x00002000 /* local close channel request */ | |
4c2cd966 | 449 | |
4a3ad2dd | 450 | #define XPC_C_DISCONNECTED 0x00004000 /* channel is disconnected */ |
2c2b94f9 | 451 | #define XPC_C_DISCONNECTING 0x00008000 /* channel is being disconnected */ |
4c2cd966 | 452 | #define XPC_C_DISCONNECTINGCALLOUT \ |
2c2b94f9 | 453 | 0x00010000 /* disconnecting callout initiated */ |
4c2cd966 | 454 | #define XPC_C_DISCONNECTINGCALLOUT_MADE \ |
2c2b94f9 DN |
455 | 0x00020000 /* disconnecting callout completed */ |
456 | #define XPC_C_WDISCONNECT 0x00040000 /* waiting for channel disconnect */ | |
89eb8eb9 | 457 | |
7fb5e59d DN |
458 | /* |
459 | * The channel control flags (chctl) union consists of a 64-bit variable which | |
460 | * is divided up into eight bytes, ordered from right to left. Byte zero | |
461 | * pertains to channel 0, byte one to channel 1, and so on. Each channel's byte | |
462 | * can have one or more of the chctl flags set in it. | |
463 | */ | |
464 | ||
465 | union xpc_channel_ctl_flags { | |
466 | u64 all_flags; | |
467 | u8 flags[XPC_MAX_NCHANNELS]; | |
468 | }; | |
469 | ||
470 | /* chctl flags */ | |
471 | #define XPC_CHCTL_CLOSEREQUEST 0x01 | |
472 | #define XPC_CHCTL_CLOSEREPLY 0x02 | |
473 | #define XPC_CHCTL_OPENREQUEST 0x04 | |
474 | #define XPC_CHCTL_OPENREPLY 0x08 | |
475 | #define XPC_CHCTL_MSGREQUEST 0x10 | |
476 | ||
477 | #define XPC_OPENCLOSE_CHCTL_FLAGS \ | |
478 | (XPC_CHCTL_CLOSEREQUEST | XPC_CHCTL_CLOSEREPLY | \ | |
479 | XPC_CHCTL_OPENREQUEST | XPC_CHCTL_OPENREPLY) | |
480 | #define XPC_MSG_CHCTL_FLAGS XPC_CHCTL_MSGREQUEST | |
481 | ||
482 | static inline int | |
483 | xpc_any_openclose_chctl_flags_set(union xpc_channel_ctl_flags *chctl) | |
484 | { | |
485 | int ch_number; | |
486 | ||
487 | for (ch_number = 0; ch_number < XPC_MAX_NCHANNELS; ch_number++) { | |
488 | if (chctl->flags[ch_number] & XPC_OPENCLOSE_CHCTL_FLAGS) | |
489 | return 1; | |
490 | } | |
491 | return 0; | |
492 | } | |
493 | ||
494 | static inline int | |
495 | xpc_any_msg_chctl_flags_set(union xpc_channel_ctl_flags *chctl) | |
496 | { | |
497 | int ch_number; | |
498 | ||
499 | for (ch_number = 0; ch_number < XPC_MAX_NCHANNELS; ch_number++) { | |
500 | if (chctl->flags[ch_number] & XPC_MSG_CHCTL_FLAGS) | |
501 | return 1; | |
502 | } | |
503 | return 0; | |
504 | } | |
505 | ||
89eb8eb9 | 506 | /* |
ea57f80c | 507 | * Manage channels on a partition basis. There is one of these structures |
89eb8eb9 DN |
508 | * for each partition (a partition will never utilize the structure that |
509 | * represents itself). | |
510 | */ | |
a47d5dac DN |
511 | |
512 | struct xpc_partition_sn2 { | |
513 | u64 remote_amos_page_pa; /* phys addr of partition's amos page */ | |
514 | int activate_IRQ_nasid; /* active partition's act/deact nasid */ | |
515 | int activate_IRQ_phys_cpuid; /* active part's act/deact phys cpuid */ | |
516 | ||
517 | u64 remote_vars_pa; /* phys addr of partition's vars */ | |
518 | u64 remote_vars_part_pa; /* phys addr of partition's vars part */ | |
519 | u8 remote_vars_version; /* version# of partition's vars */ | |
520 | ||
521 | void *local_GPs_base; /* base address of kmalloc'd space */ | |
522 | struct xpc_gp *local_GPs; /* local Get/Put values */ | |
523 | void *remote_GPs_base; /* base address of kmalloc'd space */ | |
524 | struct xpc_gp *remote_GPs; /* copy of remote partition's local */ | |
525 | /* Get/Put values */ | |
526 | u64 remote_GPs_pa; /* phys address of remote partition's local */ | |
527 | /* Get/Put values */ | |
528 | ||
529 | u64 remote_openclose_args_pa; /* phys addr of remote's args */ | |
530 | ||
7fb5e59d DN |
531 | int notify_IRQ_nasid; /* nasid of where to send notify IRQs */ |
532 | int notify_IRQ_phys_cpuid; /* CPUID of where to send notify IRQs */ | |
533 | char notify_IRQ_owner[8]; /* notify IRQ's owner's name */ | |
a47d5dac | 534 | |
c39838ce DN |
535 | struct amo *remote_chctl_amo_va; /* addr of remote chctl flags' amo */ |
536 | struct amo *local_chctl_amo_va; /* address of chctl flags' amo */ | |
a47d5dac DN |
537 | |
538 | struct timer_list dropped_notify_IRQ_timer; /* dropped IRQ timer */ | |
539 | }; | |
540 | ||
541 | struct xpc_partition_uv { | |
ea57f80c | 542 | /* !!! code is coming */ |
a47d5dac DN |
543 | }; |
544 | ||
89eb8eb9 DN |
545 | struct xpc_partition { |
546 | ||
547 | /* XPC HB infrastructure */ | |
548 | ||
4a3ad2dd | 549 | u8 remote_rp_version; /* version# of partition's rsvd pg */ |
aaa3cd69 | 550 | unsigned long remote_rp_stamp; /* time when rsvd pg was initialized */ |
4a3ad2dd | 551 | u64 remote_rp_pa; /* phys addr of partition's rsvd pg */ |
4a3ad2dd | 552 | u64 last_heartbeat; /* HB at last read */ |
6e41017a | 553 | u32 activate_IRQ_rcvd; /* IRQs since activation */ |
4a3ad2dd DN |
554 | spinlock_t act_lock; /* protect updating of act_state */ |
555 | u8 act_state; /* from XPC HB viewpoint */ | |
65c17b80 | 556 | enum xp_retval reason; /* reason partition is deactivating */ |
4a3ad2dd | 557 | int reason_line; /* line# deactivation initiated from */ |
4a3ad2dd | 558 | |
a47d5dac DN |
559 | unsigned long disengage_timeout; /* timeout in jiffies */ |
560 | struct timer_list disengage_timer; | |
a607c389 | 561 | |
89eb8eb9 DN |
562 | /* XPC infrastructure referencing and teardown control */ |
563 | ||
2c2b94f9 | 564 | u8 setup_state; /* infrastructure setup state */ |
89eb8eb9 | 565 | wait_queue_head_t teardown_wq; /* kthread waiting to teardown infra */ |
4a3ad2dd | 566 | atomic_t references; /* #of references to infrastructure */ |
89eb8eb9 | 567 | |
4a3ad2dd | 568 | u8 nchannels; /* #of defined channels supported */ |
2c2b94f9 DN |
569 | atomic_t nchannels_active; /* #of channels that are not DISCONNECTED */ |
570 | atomic_t nchannels_engaged; /* #of channels engaged with remote part */ | |
4a3ad2dd DN |
571 | struct xpc_channel *channels; /* array of channel structures */ |
572 | ||
7fb5e59d DN |
573 | /* fields used for managing channel avialability and activity */ |
574 | ||
575 | union xpc_channel_ctl_flags chctl; /* chctl flags yet to be processed */ | |
576 | spinlock_t chctl_lock; /* chctl flags lock */ | |
89eb8eb9 | 577 | |
2c2b94f9 DN |
578 | void *local_openclose_args_base; /* base address of kmalloc'd space */ |
579 | struct xpc_openclose_args *local_openclose_args; /* local's args */ | |
580 | void *remote_openclose_args_base; /* base address of kmalloc'd space */ | |
581 | struct xpc_openclose_args *remote_openclose_args; /* copy of remote's */ | |
582 | /* args */ | |
89eb8eb9 | 583 | |
89eb8eb9 DN |
584 | /* channel manager related fields */ |
585 | ||
586 | atomic_t channel_mgr_requests; /* #of requests to activate chan mgr */ | |
4a3ad2dd | 587 | wait_queue_head_t channel_mgr_wq; /* channel mgr's wait queue */ |
89eb8eb9 | 588 | |
a47d5dac DN |
589 | union { |
590 | struct xpc_partition_sn2 sn2; | |
591 | struct xpc_partition_uv uv; | |
592 | } sn; | |
593 | ||
89eb8eb9 DN |
594 | } ____cacheline_aligned; |
595 | ||
89eb8eb9 DN |
596 | /* struct xpc_partition act_state values (for XPC HB) */ |
597 | ||
598 | #define XPC_P_INACTIVE 0x00 /* partition is not active */ | |
599 | #define XPC_P_ACTIVATION_REQ 0x01 /* created thread to activate */ | |
600 | #define XPC_P_ACTIVATING 0x02 /* activation thread started */ | |
601 | #define XPC_P_ACTIVE 0x03 /* xpc_partition_up() was called */ | |
602 | #define XPC_P_DEACTIVATING 0x04 /* partition deactivation initiated */ | |
603 | ||
89eb8eb9 DN |
604 | #define XPC_DEACTIVATE_PARTITION(_p, _reason) \ |
605 | xpc_deactivate_partition(__LINE__, (_p), (_reason)) | |
606 | ||
89eb8eb9 DN |
607 | /* struct xpc_partition setup_state values */ |
608 | ||
609 | #define XPC_P_UNSET 0x00 /* infrastructure was never setup */ | |
610 | #define XPC_P_SETUP 0x01 /* infrastructure is setup */ | |
611 | #define XPC_P_WTEARDOWN 0x02 /* waiting to teardown infrastructure */ | |
612 | #define XPC_P_TORNDOWN 0x03 /* infrastructure is torndown */ | |
613 | ||
89eb8eb9 | 614 | /* |
7fb5e59d DN |
615 | * struct xpc_partition_sn2's dropped notify IRQ timer is set to wait the |
616 | * following interval #of seconds before checking for dropped notify IRQs. | |
617 | * These can occur whenever an IRQ's associated amo write doesn't complete | |
618 | * until after the IRQ was received. | |
89eb8eb9 | 619 | */ |
7fb5e59d | 620 | #define XPC_DROPPED_NOTIFY_IRQ_WAIT_INTERVAL (0.25 * HZ) |
89eb8eb9 | 621 | |
a607c389 | 622 | /* number of seconds to wait for other partitions to disengage */ |
a47d5dac | 623 | #define XPC_DISENGAGE_DEFAULT_TIMELIMIT 90 |
a607c389 | 624 | |
a47d5dac DN |
625 | /* interval in seconds to print 'waiting deactivation' messages */ |
626 | #define XPC_DEACTIVATE_PRINTMSG_INTERVAL 10 | |
a607c389 | 627 | |
64d032ba | 628 | #define XPC_PARTID(_p) ((short)((_p) - &xpc_partitions[0])) |
89eb8eb9 | 629 | |
89eb8eb9 DN |
630 | /* found in xp_main.c */ |
631 | extern struct xpc_registration xpc_registrations[]; | |
632 | ||
e54af724 | 633 | /* found in xpc_main.c */ |
89eb8eb9 DN |
634 | extern struct device *xpc_part; |
635 | extern struct device *xpc_chan; | |
a47d5dac DN |
636 | extern int xpc_disengage_timelimit; |
637 | extern int xpc_disengage_timedout; | |
6e41017a DN |
638 | extern atomic_t xpc_activate_IRQ_rcvd; |
639 | extern wait_queue_head_t xpc_activate_IRQ_wq; | |
33ba3c77 | 640 | extern void *xpc_heartbeating_to_mask; |
e54af724 | 641 | extern void xpc_activate_partition(struct xpc_partition *); |
89eb8eb9 | 642 | extern void xpc_activate_kthreads(struct xpc_channel *, int); |
a460ef8d | 643 | extern void xpc_create_kthreads(struct xpc_channel *, int, int); |
89eb8eb9 | 644 | extern void xpc_disconnect_wait(int); |
94bd2708 | 645 | extern enum xp_retval (*xpc_rsvd_page_init) (struct xpc_rsvd_page *); |
33ba3c77 DN |
646 | extern void (*xpc_heartbeat_init) (void); |
647 | extern void (*xpc_heartbeat_exit) (void); | |
648 | extern void (*xpc_increment_heartbeat) (void); | |
649 | extern void (*xpc_offline_heartbeat) (void); | |
650 | extern void (*xpc_online_heartbeat) (void); | |
651 | extern void (*xpc_check_remote_hb) (void); | |
e17d416b | 652 | extern enum xp_retval (*xpc_make_first_contact) (struct xpc_partition *); |
7fb5e59d | 653 | extern u64 (*xpc_get_chctl_all_flags) (struct xpc_partition *); |
185c3a1b DN |
654 | extern enum xp_retval (*xpc_allocate_msgqueues) (struct xpc_channel *); |
655 | extern void (*xpc_free_msgqueues) (struct xpc_channel *); | |
a47d5dac | 656 | extern void (*xpc_notify_senders_of_disconnect) (struct xpc_channel *); |
7fb5e59d | 657 | extern void (*xpc_process_msg_chctl_flags) (struct xpc_partition *, int); |
a47d5dac | 658 | extern int (*xpc_n_of_deliverable_msgs) (struct xpc_channel *); |
e17d416b | 659 | extern struct xpc_msg *(*xpc_get_deliverable_msg) (struct xpc_channel *); |
a47d5dac DN |
660 | extern void (*xpc_request_partition_activation) (struct xpc_rsvd_page *, u64, |
661 | int); | |
662 | extern void (*xpc_request_partition_reactivation) (struct xpc_partition *); | |
663 | extern void (*xpc_request_partition_deactivation) (struct xpc_partition *); | |
664 | extern void (*xpc_cancel_partition_deactivation_request) ( | |
665 | struct xpc_partition *); | |
6e41017a | 666 | extern void (*xpc_process_activate_IRQ_rcvd) (int); |
e17d416b DN |
667 | extern enum xp_retval (*xpc_setup_infrastructure) (struct xpc_partition *); |
668 | extern void (*xpc_teardown_infrastructure) (struct xpc_partition *); | |
a47d5dac DN |
669 | |
670 | extern void (*xpc_indicate_partition_engaged) (struct xpc_partition *); | |
671 | extern int (*xpc_partition_engaged) (short); | |
672 | extern int (*xpc_any_partition_engaged) (void); | |
673 | extern void (*xpc_indicate_partition_disengaged) (struct xpc_partition *); | |
674 | extern void (*xpc_assume_partition_disengaged) (short); | |
675 | ||
7fb5e59d | 676 | extern void (*xpc_send_chctl_closerequest) (struct xpc_channel *, |
a47d5dac | 677 | unsigned long *); |
7fb5e59d DN |
678 | extern void (*xpc_send_chctl_closereply) (struct xpc_channel *, |
679 | unsigned long *); | |
680 | extern void (*xpc_send_chctl_openrequest) (struct xpc_channel *, | |
a47d5dac | 681 | unsigned long *); |
7fb5e59d | 682 | extern void (*xpc_send_chctl_openreply) (struct xpc_channel *, unsigned long *); |
33ba3c77 | 683 | |
97bf1aa1 | 684 | extern enum xp_retval (*xpc_send_msg) (struct xpc_channel *, u32, void *, u16, |
33ba3c77 DN |
685 | u8, xpc_notify_func, void *); |
686 | extern void (*xpc_received_msg) (struct xpc_channel *, struct xpc_msg *); | |
94bd2708 DN |
687 | |
688 | /* found in xpc_sn2.c */ | |
6e41017a DN |
689 | extern int xpc_init_sn2(void); |
690 | extern void xpc_exit_sn2(void); | |
94bd2708 DN |
691 | |
692 | /* found in xpc_uv.c */ | |
693 | extern void xpc_init_uv(void); | |
6e41017a | 694 | extern void xpc_exit_uv(void); |
94bd2708 | 695 | |
89eb8eb9 DN |
696 | /* found in xpc_partition.c */ |
697 | extern int xpc_exiting; | |
ee6665e3 | 698 | extern int xpc_nasid_mask_words; |
89eb8eb9 | 699 | extern struct xpc_rsvd_page *xpc_rsvd_page; |
33ba3c77 | 700 | extern u64 *xpc_mach_nasids; |
bc63d387 | 701 | extern struct xpc_partition *xpc_partitions; |
7682a4c6 | 702 | extern void *xpc_kmalloc_cacheline_aligned(size_t, gfp_t, void **); |
94bd2708 | 703 | extern struct xpc_rsvd_page *xpc_setup_rsvd_page(void); |
6e41017a | 704 | extern int xpc_identify_activate_IRQ_sender(void); |
a607c389 | 705 | extern int xpc_partition_disengaged(struct xpc_partition *); |
65c17b80 | 706 | extern enum xp_retval xpc_mark_partition_active(struct xpc_partition *); |
89eb8eb9 DN |
707 | extern void xpc_mark_partition_inactive(struct xpc_partition *); |
708 | extern void xpc_discovery(void); | |
33ba3c77 DN |
709 | extern enum xp_retval xpc_get_remote_rp(int, u64 *, struct xpc_rsvd_page *, |
710 | u64 *); | |
89eb8eb9 | 711 | extern void xpc_deactivate_partition(const int, struct xpc_partition *, |
65c17b80 | 712 | enum xp_retval); |
64d032ba | 713 | extern enum xp_retval xpc_initiate_partid_to_nasids(short, void *); |
89eb8eb9 | 714 | |
89eb8eb9 DN |
715 | /* found in xpc_channel.c */ |
716 | extern void xpc_initiate_connect(int); | |
717 | extern void xpc_initiate_disconnect(int); | |
33ba3c77 | 718 | extern enum xp_retval xpc_allocate_msg_wait(struct xpc_channel *); |
97bf1aa1 DN |
719 | extern enum xp_retval xpc_initiate_send(short, int, u32, void *, u16); |
720 | extern enum xp_retval xpc_initiate_send_notify(short, int, u32, void *, u16, | |
65c17b80 | 721 | xpc_notify_func, void *); |
64d032ba | 722 | extern void xpc_initiate_received(short, int, void *); |
7fb5e59d | 723 | extern void xpc_process_sent_chctl_flags(struct xpc_partition *); |
89eb8eb9 DN |
724 | extern void xpc_connected_callout(struct xpc_channel *); |
725 | extern void xpc_deliver_msg(struct xpc_channel *); | |
726 | extern void xpc_disconnect_channel(const int, struct xpc_channel *, | |
65c17b80 DN |
727 | enum xp_retval, unsigned long *); |
728 | extern void xpc_disconnect_callout(struct xpc_channel *, enum xp_retval); | |
729 | extern void xpc_partition_going_down(struct xpc_partition *, enum xp_retval); | |
89eb8eb9 | 730 | |
33ba3c77 DN |
731 | static inline int |
732 | xpc_hb_allowed(short partid, void *heartbeating_to_mask) | |
733 | { | |
734 | return test_bit(partid, heartbeating_to_mask); | |
735 | } | |
736 | ||
737 | static inline int | |
738 | xpc_any_hbs_allowed(void) | |
739 | { | |
740 | DBUG_ON(xpc_heartbeating_to_mask == NULL); | |
741 | return !bitmap_empty(xpc_heartbeating_to_mask, xp_max_npartitions); | |
742 | } | |
743 | ||
744 | static inline void | |
745 | xpc_allow_hb(short partid) | |
746 | { | |
747 | DBUG_ON(xpc_heartbeating_to_mask == NULL); | |
748 | set_bit(partid, xpc_heartbeating_to_mask); | |
749 | } | |
750 | ||
751 | static inline void | |
752 | xpc_disallow_hb(short partid) | |
753 | { | |
754 | DBUG_ON(xpc_heartbeating_to_mask == NULL); | |
755 | clear_bit(partid, xpc_heartbeating_to_mask); | |
756 | } | |
757 | ||
758 | static inline void | |
759 | xpc_disallow_all_hbs(void) | |
760 | { | |
761 | DBUG_ON(xpc_heartbeating_to_mask == NULL); | |
762 | bitmap_zero(xpc_heartbeating_to_mask, xp_max_npartitions); | |
763 | } | |
764 | ||
89eb8eb9 DN |
765 | static inline void |
766 | xpc_wakeup_channel_mgr(struct xpc_partition *part) | |
767 | { | |
2c2b94f9 | 768 | if (atomic_inc_return(&part->channel_mgr_requests) == 1) |
89eb8eb9 | 769 | wake_up(&part->channel_mgr_wq); |
89eb8eb9 DN |
770 | } |
771 | ||
89eb8eb9 DN |
772 | /* |
773 | * These next two inlines are used to keep us from tearing down a channel's | |
774 | * msg queues while a thread may be referencing them. | |
775 | */ | |
776 | static inline void | |
777 | xpc_msgqueue_ref(struct xpc_channel *ch) | |
778 | { | |
779 | atomic_inc(&ch->references); | |
780 | } | |
781 | ||
782 | static inline void | |
783 | xpc_msgqueue_deref(struct xpc_channel *ch) | |
784 | { | |
785 | s32 refs = atomic_dec_return(&ch->references); | |
786 | ||
787 | DBUG_ON(refs < 0); | |
2c2b94f9 | 788 | if (refs == 0) |
89eb8eb9 | 789 | xpc_wakeup_channel_mgr(&xpc_partitions[ch->partid]); |
89eb8eb9 DN |
790 | } |
791 | ||
89eb8eb9 DN |
792 | #define XPC_DISCONNECT_CHANNEL(_ch, _reason, _irqflgs) \ |
793 | xpc_disconnect_channel(__LINE__, _ch, _reason, _irqflgs) | |
794 | ||
89eb8eb9 DN |
795 | /* |
796 | * These two inlines are used to keep us from tearing down a partition's | |
797 | * setup infrastructure while a thread may be referencing it. | |
798 | */ | |
799 | static inline void | |
800 | xpc_part_deref(struct xpc_partition *part) | |
801 | { | |
802 | s32 refs = atomic_dec_return(&part->references); | |
803 | ||
89eb8eb9 | 804 | DBUG_ON(refs < 0); |
2c2b94f9 | 805 | if (refs == 0 && part->setup_state == XPC_P_WTEARDOWN) |
89eb8eb9 | 806 | wake_up(&part->teardown_wq); |
89eb8eb9 DN |
807 | } |
808 | ||
809 | static inline int | |
810 | xpc_part_ref(struct xpc_partition *part) | |
811 | { | |
812 | int setup; | |
813 | ||
89eb8eb9 DN |
814 | atomic_inc(&part->references); |
815 | setup = (part->setup_state == XPC_P_SETUP); | |
2c2b94f9 | 816 | if (!setup) |
89eb8eb9 | 817 | xpc_part_deref(part); |
2c2b94f9 | 818 | |
89eb8eb9 DN |
819 | return setup; |
820 | } | |
821 | ||
89eb8eb9 DN |
822 | /* |
823 | * The following macro is to be used for the setting of the reason and | |
824 | * reason_line fields in both the struct xpc_channel and struct xpc_partition | |
825 | * structures. | |
826 | */ | |
827 | #define XPC_SET_REASON(_p, _reason, _line) \ | |
828 | { \ | |
829 | (_p)->reason = _reason; \ | |
830 | (_p)->reason_line = _line; \ | |
831 | } | |
832 | ||
45d9ca49 | 833 | #endif /* _DRIVERS_MISC_SGIXP_XPC_H */ |