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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 | |
41 | * nasids in the partition/machine or the AMO_t array used for | |
42 | * inter-partition initiation communications. | |
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; | |
4b38fcd4 | 118 | struct timespec stamp; /* time when reserved page was setup by XPC */ |
94bd2708 DN |
119 | u64 pad2[9]; /* align to last u64 in 2nd 64-byte cacheline */ |
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 DN |
124 | |
125 | #define XPC_SUPPORTS_RP_STAMP(_version) \ | |
2c2b94f9 | 126 | (_version >= _XPC_VERSION(1, 1)) |
a607c389 | 127 | |
94bd2708 | 128 | #define ZERO_STAMP ((struct timespec){0, 0}) |
a607c389 DN |
129 | /* |
130 | * compare stamps - the return value is: | |
131 | * | |
132 | * < 0, if stamp1 < stamp2 | |
133 | * = 0, if stamp1 == stamp2 | |
134 | * > 0, if stamp1 > stamp2 | |
135 | */ | |
136 | static inline int | |
137 | xpc_compare_stamps(struct timespec *stamp1, struct timespec *stamp2) | |
138 | { | |
139 | int ret; | |
140 | ||
2c2b94f9 DN |
141 | ret = stamp1->tv_sec - stamp2->tv_sec; |
142 | if (ret == 0) | |
a607c389 | 143 | ret = stamp1->tv_nsec - stamp2->tv_nsec; |
2c2b94f9 | 144 | |
a607c389 DN |
145 | return ret; |
146 | } | |
89eb8eb9 | 147 | |
89eb8eb9 DN |
148 | /* |
149 | * Define the structures by which XPC variables can be exported to other | |
150 | * partitions. (There are two: struct xpc_vars and struct xpc_vars_part) | |
151 | */ | |
152 | ||
153 | /* | |
154 | * The following structure describes the partition generic variables | |
155 | * needed by other partitions in order to properly initialize. | |
156 | * | |
157 | * struct xpc_vars version number also applies to struct xpc_vars_part. | |
158 | * Changes to either structure and/or related functionality should be | |
159 | * reflected by incrementing either the major or minor version numbers | |
160 | * of struct xpc_vars. | |
161 | */ | |
162 | struct xpc_vars { | |
163 | u8 version; | |
164 | u64 heartbeat; | |
165 | u64 heartbeating_to_mask; | |
780d09e8 | 166 | u64 heartbeat_offline; /* if 0, heartbeat should be changing */ |
89eb8eb9 DN |
167 | int act_nasid; |
168 | int act_phys_cpuid; | |
169 | u64 vars_part_pa; | |
170 | u64 amos_page_pa; /* paddr of page of AMOs from MSPEC driver */ | |
171 | AMO_t *amos_page; /* vaddr of page of AMOs from MSPEC driver */ | |
89eb8eb9 | 172 | }; |
89eb8eb9 | 173 | |
2c2b94f9 | 174 | #define XPC_V_VERSION _XPC_VERSION(3, 1) /* version 3.1 of the cross vars */ |
a607c389 DN |
175 | |
176 | #define XPC_SUPPORTS_DISENGAGE_REQUEST(_version) \ | |
2c2b94f9 | 177 | (_version >= _XPC_VERSION(3, 1)) |
a607c389 | 178 | |
a607c389 | 179 | static inline int |
64d032ba | 180 | xpc_hb_allowed(short partid, struct xpc_vars *vars) |
a607c389 DN |
181 | { |
182 | return ((vars->heartbeating_to_mask & (1UL << partid)) != 0); | |
183 | } | |
184 | ||
185 | static inline void | |
64d032ba | 186 | xpc_allow_hb(short partid, struct xpc_vars *vars) |
a607c389 DN |
187 | { |
188 | u64 old_mask, new_mask; | |
189 | ||
190 | do { | |
191 | old_mask = vars->heartbeating_to_mask; | |
192 | new_mask = (old_mask | (1UL << partid)); | |
193 | } while (cmpxchg(&vars->heartbeating_to_mask, old_mask, new_mask) != | |
4a3ad2dd | 194 | old_mask); |
a607c389 DN |
195 | } |
196 | ||
197 | static inline void | |
64d032ba | 198 | xpc_disallow_hb(short partid, struct xpc_vars *vars) |
a607c389 DN |
199 | { |
200 | u64 old_mask, new_mask; | |
201 | ||
202 | do { | |
203 | old_mask = vars->heartbeating_to_mask; | |
204 | new_mask = (old_mask & ~(1UL << partid)); | |
205 | } while (cmpxchg(&vars->heartbeating_to_mask, old_mask, new_mask) != | |
4a3ad2dd | 206 | old_mask); |
a607c389 DN |
207 | } |
208 | ||
a607c389 DN |
209 | /* |
210 | * The AMOs page consists of a number of AMO variables which are divided into | |
211 | * four groups, The first two groups are used to identify an IRQ's sender. | |
4b38fcd4 | 212 | * These two groups consist of 64 and 128 AMO variables respectively. The last |
a607c389 DN |
213 | * two groups, consisting of just one AMO variable each, are used to identify |
214 | * the remote partitions that are currently engaged (from the viewpoint of | |
215 | * the XPC running on the remote partition). | |
216 | */ | |
217 | #define XPC_NOTIFY_IRQ_AMOS 0 | |
bc63d387 | 218 | #define XPC_ACTIVATE_IRQ_AMOS (XPC_NOTIFY_IRQ_AMOS + XP_MAX_NPARTITIONS_SN2) |
a607c389 DN |
219 | #define XPC_ENGAGED_PARTITIONS_AMO (XPC_ACTIVATE_IRQ_AMOS + XP_NASID_MASK_WORDS) |
220 | #define XPC_DISENGAGE_REQUEST_AMO (XPC_ENGAGED_PARTITIONS_AMO + 1) | |
221 | ||
89eb8eb9 DN |
222 | /* |
223 | * The following structure describes the per partition specific variables. | |
224 | * | |
225 | * An array of these structures, one per partition, will be defined. As a | |
226 | * partition becomes active XPC will copy the array entry corresponding to | |
94bd2708 DN |
227 | * itself from that partition. It is desirable that the size of this structure |
228 | * evenly divides into a 128-byte cacheline, such that none of the entries in | |
229 | * this array crosses a 128-byte cacheline boundary. As it is now, each entry | |
e17d416b | 230 | * occupies 64-bytes. |
89eb8eb9 | 231 | */ |
e17d416b | 232 | struct xpc_vars_part_sn2 { |
2c2b94f9 | 233 | u64 magic; |
89eb8eb9 DN |
234 | |
235 | u64 openclose_args_pa; /* physical address of open and close args */ | |
236 | u64 GPs_pa; /* physical address of Get/Put values */ | |
237 | ||
238 | u64 IPI_amo_pa; /* physical address of IPI AMO_t structure */ | |
239 | int IPI_nasid; /* nasid of where to send IPIs */ | |
240 | int IPI_phys_cpuid; /* physical CPU ID of where to send IPIs */ | |
241 | ||
242 | u8 nchannels; /* #of defined channels supported */ | |
243 | ||
244 | u8 reserved[23]; /* pad to a full 64 bytes */ | |
245 | }; | |
246 | ||
247 | /* | |
248 | * The vars_part MAGIC numbers play a part in the first contact protocol. | |
249 | * | |
250 | * MAGIC1 indicates that the per partition specific variables for a remote | |
251 | * partition have been initialized by this partition. | |
252 | * | |
253 | * MAGIC2 indicates that this partition has pulled the remote partititions | |
254 | * per partition variables that pertain to this partition. | |
255 | */ | |
2c2b94f9 DN |
256 | #define XPC_VP_MAGIC1 0x0053524156435058L /* 'XPCVARS\0'L (little endian) */ |
257 | #define XPC_VP_MAGIC2 0x0073726176435058L /* 'XPCvars\0'L (little endian) */ | |
89eb8eb9 | 258 | |
4b38fcd4 DN |
259 | /* the reserved page sizes and offsets */ |
260 | ||
261 | #define XPC_RP_HEADER_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_rsvd_page)) | |
2c2b94f9 | 262 | #define XPC_RP_VARS_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_vars)) |
4b38fcd4 | 263 | |
2c2b94f9 | 264 | #define XPC_RP_PART_NASIDS(_rp) ((u64 *)((u8 *)(_rp) + XPC_RP_HEADER_SIZE)) |
4b38fcd4 | 265 | #define XPC_RP_MACH_NASIDS(_rp) (XPC_RP_PART_NASIDS(_rp) + xp_nasid_mask_words) |
2c2b94f9 DN |
266 | #define XPC_RP_VARS(_rp) ((struct xpc_vars *)(XPC_RP_MACH_NASIDS(_rp) + \ |
267 | xp_nasid_mask_words)) | |
4b38fcd4 | 268 | |
89eb8eb9 DN |
269 | /* |
270 | * Functions registered by add_timer() or called by kernel_thread() only | |
271 | * allow for a single 64-bit argument. The following macros can be used to | |
272 | * pack and unpack two (32-bit, 16-bit or 8-bit) arguments into or out from | |
273 | * the passed argument. | |
274 | */ | |
275 | #define XPC_PACK_ARGS(_arg1, _arg2) \ | |
276 | ((((u64) _arg1) & 0xffffffff) | \ | |
277 | ((((u64) _arg2) & 0xffffffff) << 32)) | |
278 | ||
279 | #define XPC_UNPACK_ARG1(_args) (((u64) _args) & 0xffffffff) | |
280 | #define XPC_UNPACK_ARG2(_args) ((((u64) _args) >> 32) & 0xffffffff) | |
281 | ||
89eb8eb9 DN |
282 | /* |
283 | * Define a Get/Put value pair (pointers) used with a message queue. | |
284 | */ | |
285 | struct xpc_gp { | |
2c2b94f9 DN |
286 | s64 get; /* Get value */ |
287 | s64 put; /* Put value */ | |
89eb8eb9 DN |
288 | }; |
289 | ||
290 | #define XPC_GP_SIZE \ | |
bc63d387 | 291 | L1_CACHE_ALIGN(sizeof(struct xpc_gp) * XPC_MAX_NCHANNELS) |
89eb8eb9 | 292 | |
89eb8eb9 DN |
293 | /* |
294 | * Define a structure that contains arguments associated with opening and | |
295 | * closing a channel. | |
296 | */ | |
297 | struct xpc_openclose_args { | |
298 | u16 reason; /* reason why channel is closing */ | |
299 | u16 msg_size; /* sizeof each message entry */ | |
300 | u16 remote_nentries; /* #of message entries in remote msg queue */ | |
301 | u16 local_nentries; /* #of message entries in local msg queue */ | |
302 | u64 local_msgqueue_pa; /* physical address of local message queue */ | |
303 | }; | |
304 | ||
305 | #define XPC_OPENCLOSE_ARGS_SIZE \ | |
bc63d387 DN |
306 | L1_CACHE_ALIGN(sizeof(struct xpc_openclose_args) * \ |
307 | XPC_MAX_NCHANNELS) | |
89eb8eb9 | 308 | |
89eb8eb9 DN |
309 | /* struct xpc_msg flags */ |
310 | ||
311 | #define XPC_M_DONE 0x01 /* msg has been received/consumed */ | |
312 | #define XPC_M_READY 0x02 /* msg is ready to be sent */ | |
313 | #define XPC_M_INTERRUPT 0x04 /* send interrupt when msg consumed */ | |
314 | ||
89eb8eb9 DN |
315 | #define XPC_MSG_ADDRESS(_payload) \ |
316 | ((struct xpc_msg *)((u8 *)(_payload) - XPC_MSG_PAYLOAD_OFFSET)) | |
317 | ||
89eb8eb9 DN |
318 | /* |
319 | * Defines notify entry. | |
320 | * | |
321 | * This is used to notify a message's sender that their message was received | |
322 | * and consumed by the intended recipient. | |
323 | */ | |
324 | struct xpc_notify { | |
2c2b94f9 | 325 | u8 type; /* type of notification */ |
89eb8eb9 DN |
326 | |
327 | /* the following two fields are only used if type == XPC_N_CALL */ | |
4a3ad2dd DN |
328 | xpc_notify_func func; /* user's notify function */ |
329 | void *key; /* pointer to user's key */ | |
89eb8eb9 DN |
330 | }; |
331 | ||
332 | /* struct xpc_notify type of notification */ | |
333 | ||
334 | #define XPC_N_CALL 0x01 /* notify function provided by user */ | |
335 | ||
89eb8eb9 DN |
336 | /* |
337 | * Define the structure that manages all the stuff required by a channel. In | |
338 | * particular, they are used to manage the messages sent across the channel. | |
339 | * | |
340 | * This structure is private to a partition, and is NOT shared across the | |
341 | * partition boundary. | |
342 | * | |
343 | * There is an array of these structures for each remote partition. It is | |
344 | * allocated at the time a partition becomes active. The array contains one | |
345 | * of these structures for each potential channel connection to that partition. | |
346 | * | |
347 | * Each of these structures manages two message queues (circular buffers). | |
348 | * They are allocated at the time a channel connection is made. One of | |
349 | * these message queues (local_msgqueue) holds the locally created messages | |
350 | * that are destined for the remote partition. The other of these message | |
351 | * queues (remote_msgqueue) is a locally cached copy of the remote partition's | |
352 | * own local_msgqueue. | |
353 | * | |
354 | * The following is a description of the Get/Put pointers used to manage these | |
355 | * two message queues. Consider the local_msgqueue to be on one partition | |
356 | * and the remote_msgqueue to be its cached copy on another partition. A | |
357 | * description of what each of the lettered areas contains is included. | |
358 | * | |
359 | * | |
360 | * local_msgqueue remote_msgqueue | |
361 | * | |
362 | * |/////////| |/////////| | |
363 | * w_remote_GP.get --> +---------+ |/////////| | |
364 | * | F | |/////////| | |
365 | * remote_GP.get --> +---------+ +---------+ <-- local_GP->get | |
366 | * | | | | | |
367 | * | | | E | | |
368 | * | | | | | |
369 | * | | +---------+ <-- w_local_GP.get | |
370 | * | B | |/////////| | |
371 | * | | |////D////| | |
372 | * | | |/////////| | |
373 | * | | +---------+ <-- w_remote_GP.put | |
374 | * | | |////C////| | |
375 | * local_GP->put --> +---------+ +---------+ <-- remote_GP.put | |
376 | * | | |/////////| | |
377 | * | A | |/////////| | |
378 | * | | |/////////| | |
379 | * w_local_GP.put --> +---------+ |/////////| | |
380 | * |/////////| |/////////| | |
381 | * | |
382 | * | |
383 | * ( remote_GP.[get|put] are cached copies of the remote | |
384 | * partition's local_GP->[get|put], and thus their values can | |
385 | * lag behind their counterparts on the remote partition. ) | |
386 | * | |
387 | * | |
388 | * A - Messages that have been allocated, but have not yet been sent to the | |
389 | * remote partition. | |
390 | * | |
391 | * B - Messages that have been sent, but have not yet been acknowledged by the | |
392 | * remote partition as having been received. | |
393 | * | |
394 | * C - Area that needs to be prepared for the copying of sent messages, by | |
395 | * the clearing of the message flags of any previously received messages. | |
396 | * | |
397 | * D - Area into which sent messages are to be copied from the remote | |
398 | * partition's local_msgqueue and then delivered to their intended | |
399 | * recipients. [ To allow for a multi-message copy, another pointer | |
400 | * (next_msg_to_pull) has been added to keep track of the next message | |
401 | * number needing to be copied (pulled). It chases after w_remote_GP.put. | |
402 | * Any messages lying between w_local_GP.get and next_msg_to_pull have | |
403 | * been copied and are ready to be delivered. ] | |
404 | * | |
405 | * E - Messages that have been copied and delivered, but have not yet been | |
406 | * acknowledged by the recipient as having been received. | |
407 | * | |
408 | * F - Messages that have been acknowledged, but XPC has not yet notified the | |
409 | * sender that the message was received by its intended recipient. | |
410 | * This is also an area that needs to be prepared for the allocating of | |
411 | * new messages, by the clearing of the message flags of the acknowledged | |
412 | * messages. | |
413 | */ | |
414 | struct xpc_channel { | |
64d032ba | 415 | short partid; /* ID of remote partition connected */ |
4a3ad2dd DN |
416 | spinlock_t lock; /* lock for updating this structure */ |
417 | u32 flags; /* general flags */ | |
89eb8eb9 | 418 | |
65c17b80 | 419 | enum xp_retval reason; /* reason why channel is disconnect'g */ |
4a3ad2dd | 420 | int reason_line; /* line# disconnect initiated from */ |
89eb8eb9 | 421 | |
4a3ad2dd | 422 | u16 number; /* channel # */ |
89eb8eb9 | 423 | |
4a3ad2dd DN |
424 | u16 msg_size; /* sizeof each msg entry */ |
425 | u16 local_nentries; /* #of msg entries in local msg queue */ | |
426 | u16 remote_nentries; /* #of msg entries in remote msg queue */ | |
89eb8eb9 DN |
427 | |
428 | void *local_msgqueue_base; /* base address of kmalloc'd space */ | |
429 | struct xpc_msg *local_msgqueue; /* local message queue */ | |
430 | void *remote_msgqueue_base; /* base address of kmalloc'd space */ | |
2c2b94f9 DN |
431 | struct xpc_msg *remote_msgqueue; /* cached copy of remote partition's */ |
432 | /* local message queue */ | |
4a3ad2dd DN |
433 | u64 remote_msgqueue_pa; /* phys addr of remote partition's */ |
434 | /* local message queue */ | |
89eb8eb9 | 435 | |
4a3ad2dd | 436 | atomic_t references; /* #of external references to queues */ |
89eb8eb9 | 437 | |
4a3ad2dd DN |
438 | atomic_t n_on_msg_allocate_wq; /* #on msg allocation wait queue */ |
439 | wait_queue_head_t msg_allocate_wq; /* msg allocation wait queue */ | |
89eb8eb9 | 440 | |
4a3ad2dd DN |
441 | u8 delayed_IPI_flags; /* IPI flags received, but delayed */ |
442 | /* action until channel disconnected */ | |
e54af724 | 443 | |
89eb8eb9 DN |
444 | /* queue of msg senders who want to be notified when msg received */ |
445 | ||
4a3ad2dd | 446 | atomic_t n_to_notify; /* #of msg senders to notify */ |
2c2b94f9 | 447 | struct xpc_notify *notify_queue; /* notify queue for messages sent */ |
89eb8eb9 | 448 | |
4a3ad2dd DN |
449 | xpc_channel_func func; /* user's channel function */ |
450 | void *key; /* pointer to user's key */ | |
89eb8eb9 | 451 | |
f9e505a9 | 452 | struct mutex msg_to_pull_mutex; /* next msg to pull serialization */ |
2c2b94f9 | 453 | struct completion wdisconnect_wait; /* wait for channel disconnect */ |
89eb8eb9 | 454 | |
2c2b94f9 DN |
455 | struct xpc_openclose_args *local_openclose_args; /* args passed on */ |
456 | /* opening or closing of channel */ | |
89eb8eb9 DN |
457 | |
458 | /* various flavors of local and remote Get/Put values */ | |
459 | ||
460 | struct xpc_gp *local_GP; /* local Get/Put values */ | |
461 | struct xpc_gp remote_GP; /* remote Get/Put values */ | |
462 | struct xpc_gp w_local_GP; /* working local Get/Put values */ | |
463 | struct xpc_gp w_remote_GP; /* working remote Get/Put values */ | |
4a3ad2dd | 464 | s64 next_msg_to_pull; /* Put value of next msg to pull */ |
89eb8eb9 DN |
465 | |
466 | /* kthread management related fields */ | |
467 | ||
89eb8eb9 | 468 | atomic_t kthreads_assigned; /* #of kthreads assigned to channel */ |
4a3ad2dd DN |
469 | u32 kthreads_assigned_limit; /* limit on #of kthreads assigned */ |
470 | atomic_t kthreads_idle; /* #of kthreads idle waiting for work */ | |
89eb8eb9 DN |
471 | u32 kthreads_idle_limit; /* limit on #of kthreads idle */ |
472 | atomic_t kthreads_active; /* #of kthreads actively working */ | |
89eb8eb9 DN |
473 | |
474 | wait_queue_head_t idle_wq; /* idle kthread wait queue */ | |
475 | ||
476 | } ____cacheline_aligned; | |
477 | ||
89eb8eb9 DN |
478 | /* struct xpc_channel flags */ |
479 | ||
4a3ad2dd | 480 | #define XPC_C_WASCONNECTED 0x00000001 /* channel was connected */ |
89eb8eb9 | 481 | |
4a3ad2dd DN |
482 | #define XPC_C_ROPENREPLY 0x00000002 /* remote open channel reply */ |
483 | #define XPC_C_OPENREPLY 0x00000004 /* local open channel reply */ | |
2c2b94f9 | 484 | #define XPC_C_ROPENREQUEST 0x00000008 /* remote open channel request */ |
4a3ad2dd | 485 | #define XPC_C_OPENREQUEST 0x00000010 /* local open channel request */ |
89eb8eb9 | 486 | |
2c2b94f9 DN |
487 | #define XPC_C_SETUP 0x00000020 /* channel's msgqueues are alloc'd */ |
488 | #define XPC_C_CONNECTEDCALLOUT 0x00000040 /* connected callout initiated */ | |
4c2cd966 | 489 | #define XPC_C_CONNECTEDCALLOUT_MADE \ |
2c2b94f9 | 490 | 0x00000080 /* connected callout completed */ |
4a3ad2dd DN |
491 | #define XPC_C_CONNECTED 0x00000100 /* local channel is connected */ |
492 | #define XPC_C_CONNECTING 0x00000200 /* channel is being connected */ | |
4c2cd966 | 493 | |
4a3ad2dd DN |
494 | #define XPC_C_RCLOSEREPLY 0x00000400 /* remote close channel reply */ |
495 | #define XPC_C_CLOSEREPLY 0x00000800 /* local close channel reply */ | |
2c2b94f9 DN |
496 | #define XPC_C_RCLOSEREQUEST 0x00001000 /* remote close channel request */ |
497 | #define XPC_C_CLOSEREQUEST 0x00002000 /* local close channel request */ | |
4c2cd966 | 498 | |
4a3ad2dd | 499 | #define XPC_C_DISCONNECTED 0x00004000 /* channel is disconnected */ |
2c2b94f9 | 500 | #define XPC_C_DISCONNECTING 0x00008000 /* channel is being disconnected */ |
4c2cd966 | 501 | #define XPC_C_DISCONNECTINGCALLOUT \ |
2c2b94f9 | 502 | 0x00010000 /* disconnecting callout initiated */ |
4c2cd966 | 503 | #define XPC_C_DISCONNECTINGCALLOUT_MADE \ |
2c2b94f9 DN |
504 | 0x00020000 /* disconnecting callout completed */ |
505 | #define XPC_C_WDISCONNECT 0x00040000 /* waiting for channel disconnect */ | |
89eb8eb9 DN |
506 | |
507 | /* | |
508 | * Manages channels on a partition basis. There is one of these structures | |
509 | * for each partition (a partition will never utilize the structure that | |
510 | * represents itself). | |
511 | */ | |
512 | struct xpc_partition { | |
513 | ||
514 | /* XPC HB infrastructure */ | |
515 | ||
4a3ad2dd | 516 | u8 remote_rp_version; /* version# of partition's rsvd pg */ |
2c2b94f9 | 517 | struct timespec remote_rp_stamp; /* time when rsvd pg was initialized */ |
4a3ad2dd DN |
518 | u64 remote_rp_pa; /* phys addr of partition's rsvd pg */ |
519 | u64 remote_vars_pa; /* phys addr of partition's vars */ | |
89eb8eb9 | 520 | u64 remote_vars_part_pa; /* phys addr of partition's vars part */ |
4a3ad2dd | 521 | u64 last_heartbeat; /* HB at last read */ |
89eb8eb9 | 522 | u64 remote_amos_page_pa; /* phys addr of partition's amos page */ |
4a3ad2dd | 523 | int remote_act_nasid; /* active part's act/deact nasid */ |
89eb8eb9 | 524 | int remote_act_phys_cpuid; /* active part's act/deact phys cpuid */ |
4a3ad2dd DN |
525 | u32 act_IRQ_rcvd; /* IRQs since activation */ |
526 | spinlock_t act_lock; /* protect updating of act_state */ | |
527 | u8 act_state; /* from XPC HB viewpoint */ | |
528 | u8 remote_vars_version; /* version# of partition's vars */ | |
65c17b80 | 529 | enum xp_retval reason; /* reason partition is deactivating */ |
4a3ad2dd DN |
530 | int reason_line; /* line# deactivation initiated from */ |
531 | int reactivate_nasid; /* nasid in partition to reactivate */ | |
532 | ||
533 | unsigned long disengage_request_timeout; /* timeout in jiffies */ | |
a607c389 DN |
534 | struct timer_list disengage_request_timer; |
535 | ||
89eb8eb9 DN |
536 | /* XPC infrastructure referencing and teardown control */ |
537 | ||
2c2b94f9 | 538 | u8 setup_state; /* infrastructure setup state */ |
89eb8eb9 | 539 | wait_queue_head_t teardown_wq; /* kthread waiting to teardown infra */ |
4a3ad2dd | 540 | atomic_t references; /* #of references to infrastructure */ |
89eb8eb9 | 541 | |
4a3ad2dd | 542 | u8 nchannels; /* #of defined channels supported */ |
2c2b94f9 DN |
543 | atomic_t nchannels_active; /* #of channels that are not DISCONNECTED */ |
544 | atomic_t nchannels_engaged; /* #of channels engaged with remote part */ | |
4a3ad2dd DN |
545 | struct xpc_channel *channels; /* array of channel structures */ |
546 | ||
547 | void *local_GPs_base; /* base address of kmalloc'd space */ | |
548 | struct xpc_gp *local_GPs; /* local Get/Put values */ | |
549 | void *remote_GPs_base; /* base address of kmalloc'd space */ | |
2c2b94f9 DN |
550 | struct xpc_gp *remote_GPs; /* copy of remote partition's local */ |
551 | /* Get/Put values */ | |
4a3ad2dd DN |
552 | u64 remote_GPs_pa; /* phys address of remote partition's local */ |
553 | /* Get/Put values */ | |
89eb8eb9 DN |
554 | |
555 | /* fields used to pass args when opening or closing a channel */ | |
556 | ||
2c2b94f9 DN |
557 | void *local_openclose_args_base; /* base address of kmalloc'd space */ |
558 | struct xpc_openclose_args *local_openclose_args; /* local's args */ | |
559 | void *remote_openclose_args_base; /* base address of kmalloc'd space */ | |
560 | struct xpc_openclose_args *remote_openclose_args; /* copy of remote's */ | |
561 | /* args */ | |
4a3ad2dd | 562 | u64 remote_openclose_args_pa; /* phys addr of remote's args */ |
89eb8eb9 DN |
563 | |
564 | /* IPI sending, receiving and handling related fields */ | |
565 | ||
4a3ad2dd DN |
566 | int remote_IPI_nasid; /* nasid of where to send IPIs */ |
567 | int remote_IPI_phys_cpuid; /* phys CPU ID of where to send IPIs */ | |
2c2b94f9 | 568 | AMO_t *remote_IPI_amo_va; /* address of remote IPI AMO_t structure */ |
89eb8eb9 | 569 | |
4a3ad2dd DN |
570 | AMO_t *local_IPI_amo_va; /* address of IPI AMO_t structure */ |
571 | u64 local_IPI_amo; /* IPI amo flags yet to be handled */ | |
572 | char IPI_owner[8]; /* IPI owner's name */ | |
573 | struct timer_list dropped_IPI_timer; /* dropped IPI timer */ | |
89eb8eb9 | 574 | |
4a3ad2dd | 575 | spinlock_t IPI_lock; /* IPI handler lock */ |
89eb8eb9 DN |
576 | |
577 | /* channel manager related fields */ | |
578 | ||
579 | atomic_t channel_mgr_requests; /* #of requests to activate chan mgr */ | |
4a3ad2dd | 580 | wait_queue_head_t channel_mgr_wq; /* channel mgr's wait queue */ |
89eb8eb9 DN |
581 | |
582 | } ____cacheline_aligned; | |
583 | ||
89eb8eb9 DN |
584 | /* struct xpc_partition act_state values (for XPC HB) */ |
585 | ||
586 | #define XPC_P_INACTIVE 0x00 /* partition is not active */ | |
587 | #define XPC_P_ACTIVATION_REQ 0x01 /* created thread to activate */ | |
588 | #define XPC_P_ACTIVATING 0x02 /* activation thread started */ | |
589 | #define XPC_P_ACTIVE 0x03 /* xpc_partition_up() was called */ | |
590 | #define XPC_P_DEACTIVATING 0x04 /* partition deactivation initiated */ | |
591 | ||
89eb8eb9 DN |
592 | #define XPC_DEACTIVATE_PARTITION(_p, _reason) \ |
593 | xpc_deactivate_partition(__LINE__, (_p), (_reason)) | |
594 | ||
89eb8eb9 DN |
595 | /* struct xpc_partition setup_state values */ |
596 | ||
597 | #define XPC_P_UNSET 0x00 /* infrastructure was never setup */ | |
598 | #define XPC_P_SETUP 0x01 /* infrastructure is setup */ | |
599 | #define XPC_P_WTEARDOWN 0x02 /* waiting to teardown infrastructure */ | |
600 | #define XPC_P_TORNDOWN 0x03 /* infrastructure is torndown */ | |
601 | ||
89eb8eb9 DN |
602 | /* |
603 | * struct xpc_partition IPI_timer #of seconds to wait before checking for | |
604 | * dropped IPIs. These occur whenever an IPI amo write doesn't complete until | |
605 | * after the IPI was received. | |
606 | */ | |
e17d416b | 607 | #define XPC_P_DROPPED_IPI_WAIT_INTERVAL (0.25 * HZ) |
89eb8eb9 | 608 | |
a607c389 | 609 | /* number of seconds to wait for other partitions to disengage */ |
e54af724 | 610 | #define XPC_DISENGAGE_REQUEST_DEFAULT_TIMELIMIT 90 |
a607c389 DN |
611 | |
612 | /* interval in seconds to print 'waiting disengagement' messages */ | |
613 | #define XPC_DISENGAGE_PRINTMSG_INTERVAL 10 | |
614 | ||
64d032ba | 615 | #define XPC_PARTID(_p) ((short)((_p) - &xpc_partitions[0])) |
89eb8eb9 | 616 | |
89eb8eb9 DN |
617 | /* found in xp_main.c */ |
618 | extern struct xpc_registration xpc_registrations[]; | |
619 | ||
e54af724 | 620 | /* found in xpc_main.c */ |
89eb8eb9 DN |
621 | extern struct device *xpc_part; |
622 | extern struct device *xpc_chan; | |
e54af724 | 623 | extern int xpc_disengage_request_timelimit; |
1ecaded8 | 624 | extern int xpc_disengage_request_timedout; |
5dcded1b | 625 | extern irqreturn_t xpc_notify_IRQ_handler(int, void *); |
89eb8eb9 | 626 | extern void xpc_dropped_IPI_check(struct xpc_partition *); |
e54af724 | 627 | extern void xpc_activate_partition(struct xpc_partition *); |
89eb8eb9 | 628 | extern void xpc_activate_kthreads(struct xpc_channel *, int); |
a460ef8d | 629 | extern void xpc_create_kthreads(struct xpc_channel *, int, int); |
89eb8eb9 | 630 | extern void xpc_disconnect_wait(int); |
94bd2708 | 631 | extern enum xp_retval (*xpc_rsvd_page_init) (struct xpc_rsvd_page *); |
e17d416b DN |
632 | extern enum xp_retval (*xpc_make_first_contact) (struct xpc_partition *); |
633 | extern u64 (*xpc_get_IPI_flags) (struct xpc_partition *); | |
634 | extern struct xpc_msg *(*xpc_get_deliverable_msg) (struct xpc_channel *); | |
635 | extern enum xp_retval (*xpc_setup_infrastructure) (struct xpc_partition *); | |
636 | extern void (*xpc_teardown_infrastructure) (struct xpc_partition *); | |
94bd2708 DN |
637 | |
638 | /* found in xpc_sn2.c */ | |
639 | extern void xpc_init_sn2(void); | |
640 | extern struct xpc_vars *xpc_vars; /*>>> eliminate from here */ | |
94bd2708 DN |
641 | |
642 | /* found in xpc_uv.c */ | |
643 | extern void xpc_init_uv(void); | |
644 | ||
89eb8eb9 DN |
645 | /* found in xpc_partition.c */ |
646 | extern int xpc_exiting; | |
94bd2708 | 647 | extern int xp_nasid_mask_words; |
89eb8eb9 | 648 | extern struct xpc_rsvd_page *xpc_rsvd_page; |
bc63d387 | 649 | extern struct xpc_partition *xpc_partitions; |
7682a4c6 DN |
650 | extern char *xpc_remote_copy_buffer; |
651 | extern void *xpc_remote_copy_buffer_base; | |
652 | extern void *xpc_kmalloc_cacheline_aligned(size_t, gfp_t, void **); | |
94bd2708 | 653 | extern struct xpc_rsvd_page *xpc_setup_rsvd_page(void); |
89eb8eb9 DN |
654 | extern void xpc_allow_IPI_ops(void); |
655 | extern void xpc_restrict_IPI_ops(void); | |
656 | extern int xpc_identify_act_IRQ_sender(void); | |
a607c389 | 657 | extern int xpc_partition_disengaged(struct xpc_partition *); |
65c17b80 | 658 | extern enum xp_retval xpc_mark_partition_active(struct xpc_partition *); |
89eb8eb9 DN |
659 | extern void xpc_mark_partition_inactive(struct xpc_partition *); |
660 | extern void xpc_discovery(void); | |
661 | extern void xpc_check_remote_hb(void); | |
662 | extern void xpc_deactivate_partition(const int, struct xpc_partition *, | |
65c17b80 | 663 | enum xp_retval); |
64d032ba | 664 | extern enum xp_retval xpc_initiate_partid_to_nasids(short, void *); |
89eb8eb9 | 665 | |
89eb8eb9 | 666 | /* found in xpc_channel.c */ |
e17d416b | 667 | extern void *xpc_kzalloc_cacheline_aligned(size_t, gfp_t, void **); |
89eb8eb9 DN |
668 | extern void xpc_initiate_connect(int); |
669 | extern void xpc_initiate_disconnect(int); | |
64d032ba DN |
670 | extern enum xp_retval xpc_initiate_allocate(short, int, u32, void **); |
671 | extern enum xp_retval xpc_initiate_send(short, int, void *); | |
672 | extern enum xp_retval xpc_initiate_send_notify(short, int, void *, | |
65c17b80 | 673 | xpc_notify_func, void *); |
64d032ba | 674 | extern void xpc_initiate_received(short, int, void *); |
89eb8eb9 DN |
675 | extern void xpc_process_channel_activity(struct xpc_partition *); |
676 | extern void xpc_connected_callout(struct xpc_channel *); | |
677 | extern void xpc_deliver_msg(struct xpc_channel *); | |
678 | extern void xpc_disconnect_channel(const int, struct xpc_channel *, | |
65c17b80 DN |
679 | enum xp_retval, unsigned long *); |
680 | extern void xpc_disconnect_callout(struct xpc_channel *, enum xp_retval); | |
681 | extern void xpc_partition_going_down(struct xpc_partition *, enum xp_retval); | |
89eb8eb9 | 682 | |
89eb8eb9 DN |
683 | static inline void |
684 | xpc_wakeup_channel_mgr(struct xpc_partition *part) | |
685 | { | |
2c2b94f9 | 686 | if (atomic_inc_return(&part->channel_mgr_requests) == 1) |
89eb8eb9 | 687 | wake_up(&part->channel_mgr_wq); |
89eb8eb9 DN |
688 | } |
689 | ||
89eb8eb9 DN |
690 | /* |
691 | * These next two inlines are used to keep us from tearing down a channel's | |
692 | * msg queues while a thread may be referencing them. | |
693 | */ | |
694 | static inline void | |
695 | xpc_msgqueue_ref(struct xpc_channel *ch) | |
696 | { | |
697 | atomic_inc(&ch->references); | |
698 | } | |
699 | ||
700 | static inline void | |
701 | xpc_msgqueue_deref(struct xpc_channel *ch) | |
702 | { | |
703 | s32 refs = atomic_dec_return(&ch->references); | |
704 | ||
705 | DBUG_ON(refs < 0); | |
2c2b94f9 | 706 | if (refs == 0) |
89eb8eb9 | 707 | xpc_wakeup_channel_mgr(&xpc_partitions[ch->partid]); |
89eb8eb9 DN |
708 | } |
709 | ||
89eb8eb9 DN |
710 | #define XPC_DISCONNECT_CHANNEL(_ch, _reason, _irqflgs) \ |
711 | xpc_disconnect_channel(__LINE__, _ch, _reason, _irqflgs) | |
712 | ||
89eb8eb9 DN |
713 | /* |
714 | * These two inlines are used to keep us from tearing down a partition's | |
715 | * setup infrastructure while a thread may be referencing it. | |
716 | */ | |
717 | static inline void | |
718 | xpc_part_deref(struct xpc_partition *part) | |
719 | { | |
720 | s32 refs = atomic_dec_return(&part->references); | |
721 | ||
89eb8eb9 | 722 | DBUG_ON(refs < 0); |
2c2b94f9 | 723 | if (refs == 0 && part->setup_state == XPC_P_WTEARDOWN) |
89eb8eb9 | 724 | wake_up(&part->teardown_wq); |
89eb8eb9 DN |
725 | } |
726 | ||
727 | static inline int | |
728 | xpc_part_ref(struct xpc_partition *part) | |
729 | { | |
730 | int setup; | |
731 | ||
89eb8eb9 DN |
732 | atomic_inc(&part->references); |
733 | setup = (part->setup_state == XPC_P_SETUP); | |
2c2b94f9 | 734 | if (!setup) |
89eb8eb9 | 735 | xpc_part_deref(part); |
2c2b94f9 | 736 | |
89eb8eb9 DN |
737 | return setup; |
738 | } | |
739 | ||
89eb8eb9 DN |
740 | /* |
741 | * The following macro is to be used for the setting of the reason and | |
742 | * reason_line fields in both the struct xpc_channel and struct xpc_partition | |
743 | * structures. | |
744 | */ | |
745 | #define XPC_SET_REASON(_p, _reason, _line) \ | |
746 | { \ | |
747 | (_p)->reason = _reason; \ | |
748 | (_p)->reason_line = _line; \ | |
749 | } | |
750 | ||
a607c389 DN |
751 | /* |
752 | * This next set of inlines are used to keep track of when a partition is | |
753 | * potentially engaged in accessing memory belonging to another partition. | |
754 | */ | |
755 | ||
756 | static inline void | |
757 | xpc_mark_partition_engaged(struct xpc_partition *part) | |
758 | { | |
759 | unsigned long irq_flags; | |
4a3ad2dd DN |
760 | AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa + |
761 | (XPC_ENGAGED_PARTITIONS_AMO * | |
762 | sizeof(AMO_t))); | |
a607c389 DN |
763 | |
764 | local_irq_save(irq_flags); | |
765 | ||
766 | /* set bit corresponding to our partid in remote partition's AMO */ | |
4a3ad2dd DN |
767 | FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR, |
768 | (1UL << sn_partition_id)); | |
a607c389 DN |
769 | /* |
770 | * We must always use the nofault function regardless of whether we | |
771 | * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we | |
772 | * didn't, we'd never know that the other partition is down and would | |
773 | * keep sending IPIs and AMOs to it until the heartbeat times out. | |
774 | */ | |
4a3ad2dd DN |
775 | (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo-> |
776 | variable), | |
777 | xp_nofault_PIOR_target)); | |
a607c389 DN |
778 | |
779 | local_irq_restore(irq_flags); | |
780 | } | |
781 | ||
782 | static inline void | |
783 | xpc_mark_partition_disengaged(struct xpc_partition *part) | |
784 | { | |
785 | unsigned long irq_flags; | |
4a3ad2dd DN |
786 | AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa + |
787 | (XPC_ENGAGED_PARTITIONS_AMO * | |
788 | sizeof(AMO_t))); | |
a607c389 DN |
789 | |
790 | local_irq_save(irq_flags); | |
791 | ||
792 | /* clear bit corresponding to our partid in remote partition's AMO */ | |
4a3ad2dd DN |
793 | FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND, |
794 | ~(1UL << sn_partition_id)); | |
a607c389 DN |
795 | /* |
796 | * We must always use the nofault function regardless of whether we | |
797 | * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we | |
798 | * didn't, we'd never know that the other partition is down and would | |
799 | * keep sending IPIs and AMOs to it until the heartbeat times out. | |
800 | */ | |
4a3ad2dd DN |
801 | (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo-> |
802 | variable), | |
803 | xp_nofault_PIOR_target)); | |
a607c389 DN |
804 | |
805 | local_irq_restore(irq_flags); | |
806 | } | |
807 | ||
808 | static inline void | |
809 | xpc_request_partition_disengage(struct xpc_partition *part) | |
810 | { | |
811 | unsigned long irq_flags; | |
4a3ad2dd DN |
812 | AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa + |
813 | (XPC_DISENGAGE_REQUEST_AMO * sizeof(AMO_t))); | |
a607c389 DN |
814 | |
815 | local_irq_save(irq_flags); | |
816 | ||
817 | /* set bit corresponding to our partid in remote partition's AMO */ | |
4a3ad2dd DN |
818 | FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR, |
819 | (1UL << sn_partition_id)); | |
a607c389 DN |
820 | /* |
821 | * We must always use the nofault function regardless of whether we | |
822 | * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we | |
823 | * didn't, we'd never know that the other partition is down and would | |
824 | * keep sending IPIs and AMOs to it until the heartbeat times out. | |
825 | */ | |
4a3ad2dd DN |
826 | (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo-> |
827 | variable), | |
828 | xp_nofault_PIOR_target)); | |
a607c389 DN |
829 | |
830 | local_irq_restore(irq_flags); | |
831 | } | |
832 | ||
833 | static inline void | |
834 | xpc_cancel_partition_disengage_request(struct xpc_partition *part) | |
835 | { | |
836 | unsigned long irq_flags; | |
4a3ad2dd DN |
837 | AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa + |
838 | (XPC_DISENGAGE_REQUEST_AMO * sizeof(AMO_t))); | |
a607c389 DN |
839 | |
840 | local_irq_save(irq_flags); | |
841 | ||
842 | /* clear bit corresponding to our partid in remote partition's AMO */ | |
4a3ad2dd DN |
843 | FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND, |
844 | ~(1UL << sn_partition_id)); | |
a607c389 DN |
845 | /* |
846 | * We must always use the nofault function regardless of whether we | |
847 | * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we | |
848 | * didn't, we'd never know that the other partition is down and would | |
849 | * keep sending IPIs and AMOs to it until the heartbeat times out. | |
850 | */ | |
4a3ad2dd DN |
851 | (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo-> |
852 | variable), | |
853 | xp_nofault_PIOR_target)); | |
a607c389 DN |
854 | |
855 | local_irq_restore(irq_flags); | |
856 | } | |
857 | ||
858 | static inline u64 | |
859 | xpc_partition_engaged(u64 partid_mask) | |
860 | { | |
861 | AMO_t *amo = xpc_vars->amos_page + XPC_ENGAGED_PARTITIONS_AMO; | |
862 | ||
a607c389 | 863 | /* return our partition's AMO variable ANDed with partid_mask */ |
4a3ad2dd DN |
864 | return (FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_LOAD) & |
865 | partid_mask); | |
a607c389 DN |
866 | } |
867 | ||
868 | static inline u64 | |
869 | xpc_partition_disengage_requested(u64 partid_mask) | |
870 | { | |
871 | AMO_t *amo = xpc_vars->amos_page + XPC_DISENGAGE_REQUEST_AMO; | |
872 | ||
a607c389 | 873 | /* return our partition's AMO variable ANDed with partid_mask */ |
4a3ad2dd DN |
874 | return (FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_LOAD) & |
875 | partid_mask); | |
a607c389 DN |
876 | } |
877 | ||
878 | static inline void | |
879 | xpc_clear_partition_engaged(u64 partid_mask) | |
880 | { | |
881 | AMO_t *amo = xpc_vars->amos_page + XPC_ENGAGED_PARTITIONS_AMO; | |
882 | ||
a607c389 | 883 | /* clear bit(s) based on partid_mask in our partition's AMO */ |
4a3ad2dd DN |
884 | FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND, |
885 | ~partid_mask); | |
a607c389 DN |
886 | } |
887 | ||
888 | static inline void | |
889 | xpc_clear_partition_disengage_request(u64 partid_mask) | |
890 | { | |
891 | AMO_t *amo = xpc_vars->amos_page + XPC_DISENGAGE_REQUEST_AMO; | |
892 | ||
a607c389 | 893 | /* clear bit(s) based on partid_mask in our partition's AMO */ |
4a3ad2dd DN |
894 | FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND, |
895 | ~partid_mask); | |
a607c389 DN |
896 | } |
897 | ||
89eb8eb9 DN |
898 | /* |
899 | * The following set of macros and inlines are used for the sending and | |
900 | * receiving of IPIs (also known as IRQs). There are two flavors of IPIs, | |
901 | * one that is associated with partition activity (SGI_XPC_ACTIVATE) and | |
902 | * the other that is associated with channel activity (SGI_XPC_NOTIFY). | |
903 | */ | |
904 | ||
905 | static inline u64 | |
906 | xpc_IPI_receive(AMO_t *amo) | |
907 | { | |
4a3ad2dd | 908 | return FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_CLEAR); |
89eb8eb9 DN |
909 | } |
910 | ||
65c17b80 | 911 | static inline enum xp_retval |
89eb8eb9 DN |
912 | xpc_IPI_send(AMO_t *amo, u64 flag, int nasid, int phys_cpuid, int vector) |
913 | { | |
914 | int ret = 0; | |
915 | unsigned long irq_flags; | |
916 | ||
89eb8eb9 DN |
917 | local_irq_save(irq_flags); |
918 | ||
4a3ad2dd | 919 | FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR, flag); |
89eb8eb9 DN |
920 | sn_send_IPI_phys(nasid, phys_cpuid, vector, 0); |
921 | ||
922 | /* | |
923 | * We must always use the nofault function regardless of whether we | |
924 | * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we | |
925 | * didn't, we'd never know that the other partition is down and would | |
926 | * keep sending IPIs and AMOs to it until the heartbeat times out. | |
927 | */ | |
4a3ad2dd DN |
928 | ret = xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->variable), |
929 | xp_nofault_PIOR_target)); | |
89eb8eb9 DN |
930 | |
931 | local_irq_restore(irq_flags); | |
932 | ||
65c17b80 | 933 | return ((ret == 0) ? xpSuccess : xpPioReadError); |
89eb8eb9 DN |
934 | } |
935 | ||
89eb8eb9 DN |
936 | /* |
937 | * IPIs associated with SGI_XPC_ACTIVATE IRQ. | |
938 | */ | |
939 | ||
940 | /* | |
941 | * Flag the appropriate AMO variable and send an IPI to the specified node. | |
942 | */ | |
943 | static inline void | |
a607c389 | 944 | xpc_activate_IRQ_send(u64 amos_page_pa, int from_nasid, int to_nasid, |
4a3ad2dd | 945 | int to_phys_cpuid) |
89eb8eb9 DN |
946 | { |
947 | int w_index = XPC_NASID_W_INDEX(from_nasid); | |
948 | int b_index = XPC_NASID_B_INDEX(from_nasid); | |
4a3ad2dd DN |
949 | AMO_t *amos = (AMO_t *)__va(amos_page_pa + |
950 | (XPC_ACTIVATE_IRQ_AMOS * sizeof(AMO_t))); | |
89eb8eb9 | 951 | |
4a3ad2dd DN |
952 | (void)xpc_IPI_send(&amos[w_index], (1UL << b_index), to_nasid, |
953 | to_phys_cpuid, SGI_XPC_ACTIVATE); | |
89eb8eb9 DN |
954 | } |
955 | ||
956 | static inline void | |
957 | xpc_IPI_send_activate(struct xpc_vars *vars) | |
958 | { | |
959 | xpc_activate_IRQ_send(vars->amos_page_pa, cnodeid_to_nasid(0), | |
4a3ad2dd | 960 | vars->act_nasid, vars->act_phys_cpuid); |
89eb8eb9 DN |
961 | } |
962 | ||
963 | static inline void | |
964 | xpc_IPI_send_activated(struct xpc_partition *part) | |
965 | { | |
966 | xpc_activate_IRQ_send(part->remote_amos_page_pa, cnodeid_to_nasid(0), | |
4a3ad2dd DN |
967 | part->remote_act_nasid, |
968 | part->remote_act_phys_cpuid); | |
89eb8eb9 DN |
969 | } |
970 | ||
971 | static inline void | |
972 | xpc_IPI_send_reactivate(struct xpc_partition *part) | |
973 | { | |
974 | xpc_activate_IRQ_send(xpc_vars->amos_page_pa, part->reactivate_nasid, | |
4a3ad2dd | 975 | xpc_vars->act_nasid, xpc_vars->act_phys_cpuid); |
89eb8eb9 DN |
976 | } |
977 | ||
a607c389 DN |
978 | static inline void |
979 | xpc_IPI_send_disengage(struct xpc_partition *part) | |
980 | { | |
981 | xpc_activate_IRQ_send(part->remote_amos_page_pa, cnodeid_to_nasid(0), | |
4a3ad2dd DN |
982 | part->remote_act_nasid, |
983 | part->remote_act_phys_cpuid); | |
a607c389 DN |
984 | } |
985 | ||
89eb8eb9 DN |
986 | /* |
987 | * IPIs associated with SGI_XPC_NOTIFY IRQ. | |
988 | */ | |
989 | ||
990 | /* | |
991 | * Send an IPI to the remote partition that is associated with the | |
992 | * specified channel. | |
993 | */ | |
994 | #define XPC_NOTIFY_IRQ_SEND(_ch, _ipi_f, _irq_f) \ | |
995 | xpc_notify_IRQ_send(_ch, _ipi_f, #_ipi_f, _irq_f) | |
996 | ||
997 | static inline void | |
998 | xpc_notify_IRQ_send(struct xpc_channel *ch, u8 ipi_flag, char *ipi_flag_string, | |
4a3ad2dd | 999 | unsigned long *irq_flags) |
89eb8eb9 DN |
1000 | { |
1001 | struct xpc_partition *part = &xpc_partitions[ch->partid]; | |
65c17b80 | 1002 | enum xp_retval ret; |
89eb8eb9 | 1003 | |
89eb8eb9 DN |
1004 | if (likely(part->act_state != XPC_P_DEACTIVATING)) { |
1005 | ret = xpc_IPI_send(part->remote_IPI_amo_va, | |
4a3ad2dd DN |
1006 | (u64)ipi_flag << (ch->number * 8), |
1007 | part->remote_IPI_nasid, | |
1008 | part->remote_IPI_phys_cpuid, SGI_XPC_NOTIFY); | |
89eb8eb9 DN |
1009 | dev_dbg(xpc_chan, "%s sent to partid=%d, channel=%d, ret=%d\n", |
1010 | ipi_flag_string, ch->partid, ch->number, ret); | |
65c17b80 | 1011 | if (unlikely(ret != xpSuccess)) { |
2c2b94f9 | 1012 | if (irq_flags != NULL) |
89eb8eb9 | 1013 | spin_unlock_irqrestore(&ch->lock, *irq_flags); |
89eb8eb9 | 1014 | XPC_DEACTIVATE_PARTITION(part, ret); |
2c2b94f9 | 1015 | if (irq_flags != NULL) |
89eb8eb9 | 1016 | spin_lock_irqsave(&ch->lock, *irq_flags); |
89eb8eb9 DN |
1017 | } |
1018 | } | |
1019 | } | |
1020 | ||
89eb8eb9 DN |
1021 | /* |
1022 | * Make it look like the remote partition, which is associated with the | |
1023 | * specified channel, sent us an IPI. This faked IPI will be handled | |
1024 | * by xpc_dropped_IPI_check(). | |
1025 | */ | |
1026 | #define XPC_NOTIFY_IRQ_SEND_LOCAL(_ch, _ipi_f) \ | |
1027 | xpc_notify_IRQ_send_local(_ch, _ipi_f, #_ipi_f) | |
1028 | ||
1029 | static inline void | |
1030 | xpc_notify_IRQ_send_local(struct xpc_channel *ch, u8 ipi_flag, | |
4a3ad2dd | 1031 | char *ipi_flag_string) |
89eb8eb9 DN |
1032 | { |
1033 | struct xpc_partition *part = &xpc_partitions[ch->partid]; | |
1034 | ||
4a3ad2dd DN |
1035 | FETCHOP_STORE_OP(TO_AMO((u64)&part->local_IPI_amo_va->variable), |
1036 | FETCHOP_OR, ((u64)ipi_flag << (ch->number * 8))); | |
89eb8eb9 DN |
1037 | dev_dbg(xpc_chan, "%s sent local from partid=%d, channel=%d\n", |
1038 | ipi_flag_string, ch->partid, ch->number); | |
1039 | } | |
1040 | ||
89eb8eb9 DN |
1041 | /* |
1042 | * The sending and receiving of IPIs includes the setting of an AMO variable | |
1043 | * to indicate the reason the IPI was sent. The 64-bit variable is divided | |
1044 | * up into eight bytes, ordered from right to left. Byte zero pertains to | |
1045 | * channel 0, byte one to channel 1, and so on. Each byte is described by | |
1046 | * the following IPI flags. | |
1047 | */ | |
1048 | ||
1049 | #define XPC_IPI_CLOSEREQUEST 0x01 | |
1050 | #define XPC_IPI_CLOSEREPLY 0x02 | |
1051 | #define XPC_IPI_OPENREQUEST 0x04 | |
1052 | #define XPC_IPI_OPENREPLY 0x08 | |
1053 | #define XPC_IPI_MSGREQUEST 0x10 | |
1054 | ||
89eb8eb9 DN |
1055 | /* given an AMO variable and a channel#, get its associated IPI flags */ |
1056 | #define XPC_GET_IPI_FLAGS(_amo, _c) ((u8) (((_amo) >> ((_c) * 8)) & 0xff)) | |
e54af724 | 1057 | #define XPC_SET_IPI_FLAGS(_amo, _c, _f) (_amo) |= ((u64) (_f) << ((_c) * 8)) |
89eb8eb9 | 1058 | |
2c2b94f9 DN |
1059 | #define XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(_amo) ((_amo) & 0x0f0f0f0f0f0f0f0fUL) |
1060 | #define XPC_ANY_MSG_IPI_FLAGS_SET(_amo) ((_amo) & 0x1010101010101010UL) | |
89eb8eb9 | 1061 | |
89eb8eb9 DN |
1062 | static inline void |
1063 | xpc_IPI_send_closerequest(struct xpc_channel *ch, unsigned long *irq_flags) | |
1064 | { | |
1065 | struct xpc_openclose_args *args = ch->local_openclose_args; | |
1066 | ||
89eb8eb9 DN |
1067 | args->reason = ch->reason; |
1068 | ||
1069 | XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_CLOSEREQUEST, irq_flags); | |
1070 | } | |
1071 | ||
1072 | static inline void | |
1073 | xpc_IPI_send_closereply(struct xpc_channel *ch, unsigned long *irq_flags) | |
1074 | { | |
1075 | XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_CLOSEREPLY, irq_flags); | |
1076 | } | |
1077 | ||
1078 | static inline void | |
1079 | xpc_IPI_send_openrequest(struct xpc_channel *ch, unsigned long *irq_flags) | |
1080 | { | |
1081 | struct xpc_openclose_args *args = ch->local_openclose_args; | |
1082 | ||
89eb8eb9 DN |
1083 | args->msg_size = ch->msg_size; |
1084 | args->local_nentries = ch->local_nentries; | |
1085 | ||
1086 | XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_OPENREQUEST, irq_flags); | |
1087 | } | |
1088 | ||
1089 | static inline void | |
1090 | xpc_IPI_send_openreply(struct xpc_channel *ch, unsigned long *irq_flags) | |
1091 | { | |
1092 | struct xpc_openclose_args *args = ch->local_openclose_args; | |
1093 | ||
89eb8eb9 DN |
1094 | args->remote_nentries = ch->remote_nentries; |
1095 | args->local_nentries = ch->local_nentries; | |
1096 | args->local_msgqueue_pa = __pa(ch->local_msgqueue); | |
1097 | ||
1098 | XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_OPENREPLY, irq_flags); | |
1099 | } | |
1100 | ||
1101 | static inline void | |
1102 | xpc_IPI_send_msgrequest(struct xpc_channel *ch) | |
1103 | { | |
1104 | XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_MSGREQUEST, NULL); | |
1105 | } | |
1106 | ||
1107 | static inline void | |
1108 | xpc_IPI_send_local_msgrequest(struct xpc_channel *ch) | |
1109 | { | |
1110 | XPC_NOTIFY_IRQ_SEND_LOCAL(ch, XPC_IPI_MSGREQUEST); | |
1111 | } | |
1112 | ||
89eb8eb9 | 1113 | /* |
bc63d387 | 1114 | >>> this block comment needs to be moved and re-written. |
89eb8eb9 DN |
1115 | * Memory for XPC's AMO variables is allocated by the MSPEC driver. These |
1116 | * pages are located in the lowest granule. The lowest granule uses 4k pages | |
1117 | * for cached references and an alternate TLB handler to never provide a | |
1118 | * cacheable mapping for the entire region. This will prevent speculative | |
1119 | * reading of cached copies of our lines from being issued which will cause | |
1120 | * a PI FSB Protocol error to be generated by the SHUB. For XPC, we need 64 | |
bc63d387 | 1121 | * AMO variables (based on xp_max_npartitions) for message notification and an |
4b38fcd4 DN |
1122 | * additional 128 AMO variables (based on XP_NASID_MASK_WORDS) for partition |
1123 | * activation and 2 AMO variables for partition deactivation. | |
89eb8eb9 DN |
1124 | */ |
1125 | static inline AMO_t * | |
a607c389 | 1126 | xpc_IPI_init(int index) |
89eb8eb9 | 1127 | { |
a607c389 | 1128 | AMO_t *amo = xpc_vars->amos_page + index; |
89eb8eb9 | 1129 | |
4a3ad2dd | 1130 | (void)xpc_IPI_receive(amo); /* clear AMO variable */ |
a607c389 | 1131 | return amo; |
89eb8eb9 DN |
1132 | } |
1133 | ||
89eb8eb9 DN |
1134 | /* |
1135 | * Check to see if there is any channel activity to/from the specified | |
1136 | * partition. | |
1137 | */ | |
1138 | static inline void | |
1139 | xpc_check_for_channel_activity(struct xpc_partition *part) | |
1140 | { | |
1141 | u64 IPI_amo; | |
1142 | unsigned long irq_flags; | |
1143 | ||
89eb8eb9 | 1144 | IPI_amo = xpc_IPI_receive(part->local_IPI_amo_va); |
2c2b94f9 | 1145 | if (IPI_amo == 0) |
89eb8eb9 | 1146 | return; |
89eb8eb9 DN |
1147 | |
1148 | spin_lock_irqsave(&part->IPI_lock, irq_flags); | |
1149 | part->local_IPI_amo |= IPI_amo; | |
1150 | spin_unlock_irqrestore(&part->IPI_lock, irq_flags); | |
1151 | ||
1152 | dev_dbg(xpc_chan, "received IPI from partid=%d, IPI_amo=0x%lx\n", | |
1153 | XPC_PARTID(part), IPI_amo); | |
1154 | ||
1155 | xpc_wakeup_channel_mgr(part); | |
1156 | } | |
1157 | ||
45d9ca49 | 1158 | #endif /* _DRIVERS_MISC_SGIXP_XPC_H */ |