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 * 6 * Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved. 7 */ 8 9 /* 10 * Cross Partition Communication (XPC) structures and macros. 11 */ 12 13 #ifndef _DRIVERS_MISC_SGIXP_XPC_H 14 #define _DRIVERS_MISC_SGIXP_XPC_H 15 16 #include <linux/interrupt.h> 17 #include <linux/sysctl.h> 18 #include <linux/device.h> 19 #include <linux/mutex.h> 20 #include <linux/completion.h> 21 #include <asm/pgtable.h> 22 #include <asm/processor.h> 23 #include <asm/sn/bte.h> 24 #include <asm/sn/clksupport.h> 25 #include <asm/sn/addrs.h> 26 #include <asm/sn/mspec.h> 27 #include <asm/sn/shub_mmr.h> 28 #include "xp.h" 29 30 /* 31 * XPC Version numbers consist of a major and minor number. XPC can always 32 * talk to versions with same major #, and never talk to versions with a 33 * different major #. 34 */ 35 #define _XPC_VERSION(_maj, _min) (((_maj) << 4) | ((_min) & 0xf)) 36 #define XPC_VERSION_MAJOR(_v) ((_v) >> 4) 37 #define XPC_VERSION_MINOR(_v) ((_v) & 0xf) 38 39 /* 40 * The next macros define word or bit representations for given 41 * C-brick nasid in either the SAL provided bit array representing 42 * nasids in the partition/machine or the AMO_t array used for 43 * inter-partition initiation communications. 44 * 45 * For SN2 machines, C-Bricks are alway even numbered NASIDs. As 46 * such, some space will be saved by insisting that nasid information 47 * passed from SAL always be packed for C-Bricks and the 48 * cross-partition interrupts use the same packing scheme. 49 */ 50 #define XPC_NASID_W_INDEX(_n) (((_n) / 64) / 2) 51 #define XPC_NASID_B_INDEX(_n) (((_n) / 2) & (64 - 1)) 52 #define XPC_NASID_IN_ARRAY(_n, _p) ((_p)[XPC_NASID_W_INDEX(_n)] & \ 53 (1UL << XPC_NASID_B_INDEX(_n))) 54 #define XPC_NASID_FROM_W_B(_w, _b) (((_w) * 64 + (_b)) * 2) 55 56 #define XPC_HB_DEFAULT_INTERVAL 5 /* incr HB every x secs */ 57 #define XPC_HB_CHECK_DEFAULT_INTERVAL 20 /* check HB every x secs */ 58 59 /* define the process name of HB checker and the CPU it is pinned to */ 60 #define XPC_HB_CHECK_THREAD_NAME "xpc_hb" 61 #define XPC_HB_CHECK_CPU 0 62 63 /* define the process name of the discovery thread */ 64 #define XPC_DISCOVERY_THREAD_NAME "xpc_discovery" 65 66 /* 67 * the reserved page 68 * 69 * SAL reserves one page of memory per partition for XPC. Though a full page 70 * in length (16384 bytes), its starting address is not page aligned, but it 71 * is cacheline aligned. The reserved page consists of the following: 72 * 73 * reserved page header 74 * 75 * The first cacheline of the reserved page contains the header 76 * (struct xpc_rsvd_page). Before SAL initialization has completed, 77 * SAL has set up the following fields of the reserved page header: 78 * SAL_signature, SAL_version, partid, and nasids_size. The other 79 * fields are set up by XPC. (xpc_rsvd_page points to the local 80 * partition's reserved page.) 81 * 82 * part_nasids mask 83 * mach_nasids mask 84 * 85 * SAL also sets up two bitmaps (or masks), one that reflects the actual 86 * nasids in this partition (part_nasids), and the other that reflects 87 * the actual nasids in the entire machine (mach_nasids). We're only 88 * interested in the even numbered nasids (which contain the processors 89 * and/or memory), so we only need half as many bits to represent the 90 * nasids. The part_nasids mask is located starting at the first cacheline 91 * following the reserved page header. The mach_nasids mask follows right 92 * after the part_nasids mask. The size in bytes of each mask is reflected 93 * by the reserved page header field 'nasids_size'. (Local partition's 94 * mask pointers are xpc_part_nasids and xpc_mach_nasids.) 95 * 96 * vars 97 * vars part 98 * 99 * Immediately following the mach_nasids mask are the XPC variables 100 * required by other partitions. First are those that are generic to all 101 * partitions (vars), followed on the next available cacheline by those 102 * which are partition specific (vars part). These are setup by XPC. 103 * (Local partition's vars pointers are xpc_vars and xpc_vars_part.) 104 * 105 * Note: Until vars_pa is set, the partition XPC code has not been initialized. 106 */ 107 struct xpc_rsvd_page { 108 u64 SAL_signature; /* SAL: unique signature */ 109 u64 SAL_version; /* SAL: version */ 110 u8 partid; /* SAL: partition ID */ 111 u8 version; 112 u8 pad1[6]; /* align to next u64 in cacheline */ 113 u64 vars_pa; /* physical address of struct xpc_vars */ 114 struct timespec stamp; /* time when reserved page was setup by XPC */ 115 u64 pad2[9]; /* align to last u64 in cacheline */ 116 u64 nasids_size; /* SAL: size of each nasid mask in bytes */ 117 }; 118 119 #define XPC_RP_VERSION _XPC_VERSION(1, 1) /* version 1.1 of the reserved page */ 120 121 #define XPC_SUPPORTS_RP_STAMP(_version) \ 122 (_version >= _XPC_VERSION(1, 1)) 123 124 /* 125 * compare stamps - the return value is: 126 * 127 * < 0, if stamp1 < stamp2 128 * = 0, if stamp1 == stamp2 129 * > 0, if stamp1 > stamp2 130 */ 131 static inline int 132 xpc_compare_stamps(struct timespec *stamp1, struct timespec *stamp2) 133 { 134 int ret; 135 136 ret = stamp1->tv_sec - stamp2->tv_sec; 137 if (ret == 0) 138 ret = stamp1->tv_nsec - stamp2->tv_nsec; 139 140 return ret; 141 } 142 143 /* 144 * Define the structures by which XPC variables can be exported to other 145 * partitions. (There are two: struct xpc_vars and struct xpc_vars_part) 146 */ 147 148 /* 149 * The following structure describes the partition generic variables 150 * needed by other partitions in order to properly initialize. 151 * 152 * struct xpc_vars version number also applies to struct xpc_vars_part. 153 * Changes to either structure and/or related functionality should be 154 * reflected by incrementing either the major or minor version numbers 155 * of struct xpc_vars. 156 */ 157 struct xpc_vars { 158 u8 version; 159 u64 heartbeat; 160 u64 heartbeating_to_mask; 161 u64 heartbeat_offline; /* if 0, heartbeat should be changing */ 162 int act_nasid; 163 int act_phys_cpuid; 164 u64 vars_part_pa; 165 u64 amos_page_pa; /* paddr of page of AMOs from MSPEC driver */ 166 AMO_t *amos_page; /* vaddr of page of AMOs from MSPEC driver */ 167 }; 168 169 #define XPC_V_VERSION _XPC_VERSION(3, 1) /* version 3.1 of the cross vars */ 170 171 #define XPC_SUPPORTS_DISENGAGE_REQUEST(_version) \ 172 (_version >= _XPC_VERSION(3, 1)) 173 174 static inline int 175 xpc_hb_allowed(short partid, struct xpc_vars *vars) 176 { 177 return ((vars->heartbeating_to_mask & (1UL << partid)) != 0); 178 } 179 180 static inline void 181 xpc_allow_hb(short partid, struct xpc_vars *vars) 182 { 183 u64 old_mask, new_mask; 184 185 do { 186 old_mask = vars->heartbeating_to_mask; 187 new_mask = (old_mask | (1UL << partid)); 188 } while (cmpxchg(&vars->heartbeating_to_mask, old_mask, new_mask) != 189 old_mask); 190 } 191 192 static inline void 193 xpc_disallow_hb(short partid, struct xpc_vars *vars) 194 { 195 u64 old_mask, new_mask; 196 197 do { 198 old_mask = vars->heartbeating_to_mask; 199 new_mask = (old_mask & ~(1UL << partid)); 200 } while (cmpxchg(&vars->heartbeating_to_mask, old_mask, new_mask) != 201 old_mask); 202 } 203 204 /* 205 * The AMOs page consists of a number of AMO variables which are divided into 206 * four groups, The first two groups are used to identify an IRQ's sender. 207 * These two groups consist of 64 and 128 AMO variables respectively. The last 208 * two groups, consisting of just one AMO variable each, are used to identify 209 * the remote partitions that are currently engaged (from the viewpoint of 210 * the XPC running on the remote partition). 211 */ 212 #define XPC_NOTIFY_IRQ_AMOS 0 213 #define XPC_ACTIVATE_IRQ_AMOS (XPC_NOTIFY_IRQ_AMOS + XP_MAX_PARTITIONS) 214 #define XPC_ENGAGED_PARTITIONS_AMO (XPC_ACTIVATE_IRQ_AMOS + XP_NASID_MASK_WORDS) 215 #define XPC_DISENGAGE_REQUEST_AMO (XPC_ENGAGED_PARTITIONS_AMO + 1) 216 217 /* 218 * The following structure describes the per partition specific variables. 219 * 220 * An array of these structures, one per partition, will be defined. As a 221 * partition becomes active XPC will copy the array entry corresponding to 222 * itself from that partition. It is desirable that the size of this 223 * structure evenly divide into a cacheline, such that none of the entries 224 * in this array crosses a cacheline boundary. As it is now, each entry 225 * occupies half a cacheline. 226 */ 227 struct xpc_vars_part { 228 u64 magic; 229 230 u64 openclose_args_pa; /* physical address of open and close args */ 231 u64 GPs_pa; /* physical address of Get/Put values */ 232 233 u64 IPI_amo_pa; /* physical address of IPI AMO_t structure */ 234 int IPI_nasid; /* nasid of where to send IPIs */ 235 int IPI_phys_cpuid; /* physical CPU ID of where to send IPIs */ 236 237 u8 nchannels; /* #of defined channels supported */ 238 239 u8 reserved[23]; /* pad to a full 64 bytes */ 240 }; 241 242 /* 243 * The vars_part MAGIC numbers play a part in the first contact protocol. 244 * 245 * MAGIC1 indicates that the per partition specific variables for a remote 246 * partition have been initialized by this partition. 247 * 248 * MAGIC2 indicates that this partition has pulled the remote partititions 249 * per partition variables that pertain to this partition. 250 */ 251 #define XPC_VP_MAGIC1 0x0053524156435058L /* 'XPCVARS\0'L (little endian) */ 252 #define XPC_VP_MAGIC2 0x0073726176435058L /* 'XPCvars\0'L (little endian) */ 253 254 /* the reserved page sizes and offsets */ 255 256 #define XPC_RP_HEADER_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_rsvd_page)) 257 #define XPC_RP_VARS_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_vars)) 258 259 #define XPC_RP_PART_NASIDS(_rp) ((u64 *)((u8 *)(_rp) + XPC_RP_HEADER_SIZE)) 260 #define XPC_RP_MACH_NASIDS(_rp) (XPC_RP_PART_NASIDS(_rp) + xp_nasid_mask_words) 261 #define XPC_RP_VARS(_rp) ((struct xpc_vars *)(XPC_RP_MACH_NASIDS(_rp) + \ 262 xp_nasid_mask_words)) 263 #define XPC_RP_VARS_PART(_rp) ((struct xpc_vars_part *) \ 264 ((u8 *)XPC_RP_VARS(_rp) + XPC_RP_VARS_SIZE)) 265 266 /* 267 * Functions registered by add_timer() or called by kernel_thread() only 268 * allow for a single 64-bit argument. The following macros can be used to 269 * pack and unpack two (32-bit, 16-bit or 8-bit) arguments into or out from 270 * the passed argument. 271 */ 272 #define XPC_PACK_ARGS(_arg1, _arg2) \ 273 ((((u64) _arg1) & 0xffffffff) | \ 274 ((((u64) _arg2) & 0xffffffff) << 32)) 275 276 #define XPC_UNPACK_ARG1(_args) (((u64) _args) & 0xffffffff) 277 #define XPC_UNPACK_ARG2(_args) ((((u64) _args) >> 32) & 0xffffffff) 278 279 /* 280 * Define a Get/Put value pair (pointers) used with a message queue. 281 */ 282 struct xpc_gp { 283 s64 get; /* Get value */ 284 s64 put; /* Put value */ 285 }; 286 287 #define XPC_GP_SIZE \ 288 L1_CACHE_ALIGN(sizeof(struct xpc_gp) * XPC_NCHANNELS) 289 290 /* 291 * Define a structure that contains arguments associated with opening and 292 * closing a channel. 293 */ 294 struct xpc_openclose_args { 295 u16 reason; /* reason why channel is closing */ 296 u16 msg_size; /* sizeof each message entry */ 297 u16 remote_nentries; /* #of message entries in remote msg queue */ 298 u16 local_nentries; /* #of message entries in local msg queue */ 299 u64 local_msgqueue_pa; /* physical address of local message queue */ 300 }; 301 302 #define XPC_OPENCLOSE_ARGS_SIZE \ 303 L1_CACHE_ALIGN(sizeof(struct xpc_openclose_args) * XPC_NCHANNELS) 304 305 /* struct xpc_msg flags */ 306 307 #define XPC_M_DONE 0x01 /* msg has been received/consumed */ 308 #define XPC_M_READY 0x02 /* msg is ready to be sent */ 309 #define XPC_M_INTERRUPT 0x04 /* send interrupt when msg consumed */ 310 311 #define XPC_MSG_ADDRESS(_payload) \ 312 ((struct xpc_msg *)((u8 *)(_payload) - XPC_MSG_PAYLOAD_OFFSET)) 313 314 /* 315 * Defines notify entry. 316 * 317 * This is used to notify a message's sender that their message was received 318 * and consumed by the intended recipient. 319 */ 320 struct xpc_notify { 321 u8 type; /* type of notification */ 322 323 /* the following two fields are only used if type == XPC_N_CALL */ 324 xpc_notify_func func; /* user's notify function */ 325 void *key; /* pointer to user's key */ 326 }; 327 328 /* struct xpc_notify type of notification */ 329 330 #define XPC_N_CALL 0x01 /* notify function provided by user */ 331 332 /* 333 * Define the structure that manages all the stuff required by a channel. In 334 * particular, they are used to manage the messages sent across the channel. 335 * 336 * This structure is private to a partition, and is NOT shared across the 337 * partition boundary. 338 * 339 * There is an array of these structures for each remote partition. It is 340 * allocated at the time a partition becomes active. The array contains one 341 * of these structures for each potential channel connection to that partition. 342 * 343 * Each of these structures manages two message queues (circular buffers). 344 * They are allocated at the time a channel connection is made. One of 345 * these message queues (local_msgqueue) holds the locally created messages 346 * that are destined for the remote partition. The other of these message 347 * queues (remote_msgqueue) is a locally cached copy of the remote partition's 348 * own local_msgqueue. 349 * 350 * The following is a description of the Get/Put pointers used to manage these 351 * two message queues. Consider the local_msgqueue to be on one partition 352 * and the remote_msgqueue to be its cached copy on another partition. A 353 * description of what each of the lettered areas contains is included. 354 * 355 * 356 * local_msgqueue remote_msgqueue 357 * 358 * |/////////| |/////////| 359 * w_remote_GP.get --> +---------+ |/////////| 360 * | F | |/////////| 361 * remote_GP.get --> +---------+ +---------+ <-- local_GP->get 362 * | | | | 363 * | | | E | 364 * | | | | 365 * | | +---------+ <-- w_local_GP.get 366 * | B | |/////////| 367 * | | |////D////| 368 * | | |/////////| 369 * | | +---------+ <-- w_remote_GP.put 370 * | | |////C////| 371 * local_GP->put --> +---------+ +---------+ <-- remote_GP.put 372 * | | |/////////| 373 * | A | |/////////| 374 * | | |/////////| 375 * w_local_GP.put --> +---------+ |/////////| 376 * |/////////| |/////////| 377 * 378 * 379 * ( remote_GP.[get|put] are cached copies of the remote 380 * partition's local_GP->[get|put], and thus their values can 381 * lag behind their counterparts on the remote partition. ) 382 * 383 * 384 * A - Messages that have been allocated, but have not yet been sent to the 385 * remote partition. 386 * 387 * B - Messages that have been sent, but have not yet been acknowledged by the 388 * remote partition as having been received. 389 * 390 * C - Area that needs to be prepared for the copying of sent messages, by 391 * the clearing of the message flags of any previously received messages. 392 * 393 * D - Area into which sent messages are to be copied from the remote 394 * partition's local_msgqueue and then delivered to their intended 395 * recipients. [ To allow for a multi-message copy, another pointer 396 * (next_msg_to_pull) has been added to keep track of the next message 397 * number needing to be copied (pulled). It chases after w_remote_GP.put. 398 * Any messages lying between w_local_GP.get and next_msg_to_pull have 399 * been copied and are ready to be delivered. ] 400 * 401 * E - Messages that have been copied and delivered, but have not yet been 402 * acknowledged by the recipient as having been received. 403 * 404 * F - Messages that have been acknowledged, but XPC has not yet notified the 405 * sender that the message was received by its intended recipient. 406 * This is also an area that needs to be prepared for the allocating of 407 * new messages, by the clearing of the message flags of the acknowledged 408 * messages. 409 */ 410 struct xpc_channel { 411 short partid; /* ID of remote partition connected */ 412 spinlock_t lock; /* lock for updating this structure */ 413 u32 flags; /* general flags */ 414 415 enum xp_retval reason; /* reason why channel is disconnect'g */ 416 int reason_line; /* line# disconnect initiated from */ 417 418 u16 number; /* channel # */ 419 420 u16 msg_size; /* sizeof each msg entry */ 421 u16 local_nentries; /* #of msg entries in local msg queue */ 422 u16 remote_nentries; /* #of msg entries in remote msg queue */ 423 424 void *local_msgqueue_base; /* base address of kmalloc'd space */ 425 struct xpc_msg *local_msgqueue; /* local message queue */ 426 void *remote_msgqueue_base; /* base address of kmalloc'd space */ 427 struct xpc_msg *remote_msgqueue; /* cached copy of remote partition's */ 428 /* local message queue */ 429 u64 remote_msgqueue_pa; /* phys addr of remote partition's */ 430 /* local message queue */ 431 432 atomic_t references; /* #of external references to queues */ 433 434 atomic_t n_on_msg_allocate_wq; /* #on msg allocation wait queue */ 435 wait_queue_head_t msg_allocate_wq; /* msg allocation wait queue */ 436 437 u8 delayed_IPI_flags; /* IPI flags received, but delayed */ 438 /* action until channel disconnected */ 439 440 /* queue of msg senders who want to be notified when msg received */ 441 442 atomic_t n_to_notify; /* #of msg senders to notify */ 443 struct xpc_notify *notify_queue; /* notify queue for messages sent */ 444 445 xpc_channel_func func; /* user's channel function */ 446 void *key; /* pointer to user's key */ 447 448 struct mutex msg_to_pull_mutex; /* next msg to pull serialization */ 449 struct completion wdisconnect_wait; /* wait for channel disconnect */ 450 451 struct xpc_openclose_args *local_openclose_args; /* args passed on */ 452 /* opening or closing of channel */ 453 454 /* various flavors of local and remote Get/Put values */ 455 456 struct xpc_gp *local_GP; /* local Get/Put values */ 457 struct xpc_gp remote_GP; /* remote Get/Put values */ 458 struct xpc_gp w_local_GP; /* working local Get/Put values */ 459 struct xpc_gp w_remote_GP; /* working remote Get/Put values */ 460 s64 next_msg_to_pull; /* Put value of next msg to pull */ 461 462 /* kthread management related fields */ 463 464 atomic_t kthreads_assigned; /* #of kthreads assigned to channel */ 465 u32 kthreads_assigned_limit; /* limit on #of kthreads assigned */ 466 atomic_t kthreads_idle; /* #of kthreads idle waiting for work */ 467 u32 kthreads_idle_limit; /* limit on #of kthreads idle */ 468 atomic_t kthreads_active; /* #of kthreads actively working */ 469 470 wait_queue_head_t idle_wq; /* idle kthread wait queue */ 471 472 } ____cacheline_aligned; 473 474 /* struct xpc_channel flags */ 475 476 #define XPC_C_WASCONNECTED 0x00000001 /* channel was connected */ 477 478 #define XPC_C_ROPENREPLY 0x00000002 /* remote open channel reply */ 479 #define XPC_C_OPENREPLY 0x00000004 /* local open channel reply */ 480 #define XPC_C_ROPENREQUEST 0x00000008 /* remote open channel request */ 481 #define XPC_C_OPENREQUEST 0x00000010 /* local open channel request */ 482 483 #define XPC_C_SETUP 0x00000020 /* channel's msgqueues are alloc'd */ 484 #define XPC_C_CONNECTEDCALLOUT 0x00000040 /* connected callout initiated */ 485 #define XPC_C_CONNECTEDCALLOUT_MADE \ 486 0x00000080 /* connected callout completed */ 487 #define XPC_C_CONNECTED 0x00000100 /* local channel is connected */ 488 #define XPC_C_CONNECTING 0x00000200 /* channel is being connected */ 489 490 #define XPC_C_RCLOSEREPLY 0x00000400 /* remote close channel reply */ 491 #define XPC_C_CLOSEREPLY 0x00000800 /* local close channel reply */ 492 #define XPC_C_RCLOSEREQUEST 0x00001000 /* remote close channel request */ 493 #define XPC_C_CLOSEREQUEST 0x00002000 /* local close channel request */ 494 495 #define XPC_C_DISCONNECTED 0x00004000 /* channel is disconnected */ 496 #define XPC_C_DISCONNECTING 0x00008000 /* channel is being disconnected */ 497 #define XPC_C_DISCONNECTINGCALLOUT \ 498 0x00010000 /* disconnecting callout initiated */ 499 #define XPC_C_DISCONNECTINGCALLOUT_MADE \ 500 0x00020000 /* disconnecting callout completed */ 501 #define XPC_C_WDISCONNECT 0x00040000 /* waiting for channel disconnect */ 502 503 /* 504 * Manages channels on a partition basis. There is one of these structures 505 * for each partition (a partition will never utilize the structure that 506 * represents itself). 507 */ 508 struct xpc_partition { 509 510 /* XPC HB infrastructure */ 511 512 u8 remote_rp_version; /* version# of partition's rsvd pg */ 513 struct timespec remote_rp_stamp; /* time when rsvd pg was initialized */ 514 u64 remote_rp_pa; /* phys addr of partition's rsvd pg */ 515 u64 remote_vars_pa; /* phys addr of partition's vars */ 516 u64 remote_vars_part_pa; /* phys addr of partition's vars part */ 517 u64 last_heartbeat; /* HB at last read */ 518 u64 remote_amos_page_pa; /* phys addr of partition's amos page */ 519 int remote_act_nasid; /* active part's act/deact nasid */ 520 int remote_act_phys_cpuid; /* active part's act/deact phys cpuid */ 521 u32 act_IRQ_rcvd; /* IRQs since activation */ 522 spinlock_t act_lock; /* protect updating of act_state */ 523 u8 act_state; /* from XPC HB viewpoint */ 524 u8 remote_vars_version; /* version# of partition's vars */ 525 enum xp_retval reason; /* reason partition is deactivating */ 526 int reason_line; /* line# deactivation initiated from */ 527 int reactivate_nasid; /* nasid in partition to reactivate */ 528 529 unsigned long disengage_request_timeout; /* timeout in jiffies */ 530 struct timer_list disengage_request_timer; 531 532 /* XPC infrastructure referencing and teardown control */ 533 534 u8 setup_state; /* infrastructure setup state */ 535 wait_queue_head_t teardown_wq; /* kthread waiting to teardown infra */ 536 atomic_t references; /* #of references to infrastructure */ 537 538 /* 539 * NONE OF THE PRECEDING FIELDS OF THIS STRUCTURE WILL BE CLEARED WHEN 540 * XPC SETS UP THE NECESSARY INFRASTRUCTURE TO SUPPORT CROSS PARTITION 541 * COMMUNICATION. ALL OF THE FOLLOWING FIELDS WILL BE CLEARED. (THE 542 * 'nchannels' FIELD MUST BE THE FIRST OF THE FIELDS TO BE CLEARED.) 543 */ 544 545 u8 nchannels; /* #of defined channels supported */ 546 atomic_t nchannels_active; /* #of channels that are not DISCONNECTED */ 547 atomic_t nchannels_engaged; /* #of channels engaged with remote part */ 548 struct xpc_channel *channels; /* array of channel structures */ 549 550 void *local_GPs_base; /* base address of kmalloc'd space */ 551 struct xpc_gp *local_GPs; /* local Get/Put values */ 552 void *remote_GPs_base; /* base address of kmalloc'd space */ 553 struct xpc_gp *remote_GPs; /* copy of remote partition's local */ 554 /* Get/Put values */ 555 u64 remote_GPs_pa; /* phys address of remote partition's local */ 556 /* Get/Put values */ 557 558 /* fields used to pass args when opening or closing a channel */ 559 560 void *local_openclose_args_base; /* base address of kmalloc'd space */ 561 struct xpc_openclose_args *local_openclose_args; /* local's args */ 562 void *remote_openclose_args_base; /* base address of kmalloc'd space */ 563 struct xpc_openclose_args *remote_openclose_args; /* copy of remote's */ 564 /* args */ 565 u64 remote_openclose_args_pa; /* phys addr of remote's args */ 566 567 /* IPI sending, receiving and handling related fields */ 568 569 int remote_IPI_nasid; /* nasid of where to send IPIs */ 570 int remote_IPI_phys_cpuid; /* phys CPU ID of where to send IPIs */ 571 AMO_t *remote_IPI_amo_va; /* address of remote IPI AMO_t structure */ 572 573 AMO_t *local_IPI_amo_va; /* address of IPI AMO_t structure */ 574 u64 local_IPI_amo; /* IPI amo flags yet to be handled */ 575 char IPI_owner[8]; /* IPI owner's name */ 576 struct timer_list dropped_IPI_timer; /* dropped IPI timer */ 577 578 spinlock_t IPI_lock; /* IPI handler lock */ 579 580 /* channel manager related fields */ 581 582 atomic_t channel_mgr_requests; /* #of requests to activate chan mgr */ 583 wait_queue_head_t channel_mgr_wq; /* channel mgr's wait queue */ 584 585 } ____cacheline_aligned; 586 587 /* struct xpc_partition act_state values (for XPC HB) */ 588 589 #define XPC_P_INACTIVE 0x00 /* partition is not active */ 590 #define XPC_P_ACTIVATION_REQ 0x01 /* created thread to activate */ 591 #define XPC_P_ACTIVATING 0x02 /* activation thread started */ 592 #define XPC_P_ACTIVE 0x03 /* xpc_partition_up() was called */ 593 #define XPC_P_DEACTIVATING 0x04 /* partition deactivation initiated */ 594 595 #define XPC_DEACTIVATE_PARTITION(_p, _reason) \ 596 xpc_deactivate_partition(__LINE__, (_p), (_reason)) 597 598 /* struct xpc_partition setup_state values */ 599 600 #define XPC_P_UNSET 0x00 /* infrastructure was never setup */ 601 #define XPC_P_SETUP 0x01 /* infrastructure is setup */ 602 #define XPC_P_WTEARDOWN 0x02 /* waiting to teardown infrastructure */ 603 #define XPC_P_TORNDOWN 0x03 /* infrastructure is torndown */ 604 605 /* 606 * struct xpc_partition IPI_timer #of seconds to wait before checking for 607 * dropped IPIs. These occur whenever an IPI amo write doesn't complete until 608 * after the IPI was received. 609 */ 610 #define XPC_P_DROPPED_IPI_WAIT (0.25 * HZ) 611 612 /* number of seconds to wait for other partitions to disengage */ 613 #define XPC_DISENGAGE_REQUEST_DEFAULT_TIMELIMIT 90 614 615 /* interval in seconds to print 'waiting disengagement' messages */ 616 #define XPC_DISENGAGE_PRINTMSG_INTERVAL 10 617 618 #define XPC_PARTID(_p) ((short)((_p) - &xpc_partitions[0])) 619 620 /* found in xp_main.c */ 621 extern struct xpc_registration xpc_registrations[]; 622 623 /* found in xpc_main.c */ 624 extern struct device *xpc_part; 625 extern struct device *xpc_chan; 626 extern int xpc_disengage_request_timelimit; 627 extern int xpc_disengage_request_timedout; 628 extern irqreturn_t xpc_notify_IRQ_handler(int, void *); 629 extern void xpc_dropped_IPI_check(struct xpc_partition *); 630 extern void xpc_activate_partition(struct xpc_partition *); 631 extern void xpc_activate_kthreads(struct xpc_channel *, int); 632 extern void xpc_create_kthreads(struct xpc_channel *, int, int); 633 extern void xpc_disconnect_wait(int); 634 635 /* found in xpc_partition.c */ 636 extern int xpc_exiting; 637 extern struct xpc_vars *xpc_vars; 638 extern struct xpc_rsvd_page *xpc_rsvd_page; 639 extern struct xpc_vars_part *xpc_vars_part; 640 extern struct xpc_partition xpc_partitions[XP_MAX_PARTITIONS + 1]; 641 extern char *xpc_remote_copy_buffer; 642 extern void *xpc_remote_copy_buffer_base; 643 extern void *xpc_kmalloc_cacheline_aligned(size_t, gfp_t, void **); 644 extern struct xpc_rsvd_page *xpc_rsvd_page_init(void); 645 extern void xpc_allow_IPI_ops(void); 646 extern void xpc_restrict_IPI_ops(void); 647 extern int xpc_identify_act_IRQ_sender(void); 648 extern int xpc_partition_disengaged(struct xpc_partition *); 649 extern enum xp_retval xpc_mark_partition_active(struct xpc_partition *); 650 extern void xpc_mark_partition_inactive(struct xpc_partition *); 651 extern void xpc_discovery(void); 652 extern void xpc_check_remote_hb(void); 653 extern void xpc_deactivate_partition(const int, struct xpc_partition *, 654 enum xp_retval); 655 extern enum xp_retval xpc_initiate_partid_to_nasids(short, void *); 656 657 /* found in xpc_channel.c */ 658 extern void xpc_initiate_connect(int); 659 extern void xpc_initiate_disconnect(int); 660 extern enum xp_retval xpc_initiate_allocate(short, int, u32, void **); 661 extern enum xp_retval xpc_initiate_send(short, int, void *); 662 extern enum xp_retval xpc_initiate_send_notify(short, int, void *, 663 xpc_notify_func, void *); 664 extern void xpc_initiate_received(short, int, void *); 665 extern enum xp_retval xpc_setup_infrastructure(struct xpc_partition *); 666 extern enum xp_retval xpc_pull_remote_vars_part(struct xpc_partition *); 667 extern void xpc_process_channel_activity(struct xpc_partition *); 668 extern void xpc_connected_callout(struct xpc_channel *); 669 extern void xpc_deliver_msg(struct xpc_channel *); 670 extern void xpc_disconnect_channel(const int, struct xpc_channel *, 671 enum xp_retval, unsigned long *); 672 extern void xpc_disconnect_callout(struct xpc_channel *, enum xp_retval); 673 extern void xpc_partition_going_down(struct xpc_partition *, enum xp_retval); 674 extern void xpc_teardown_infrastructure(struct xpc_partition *); 675 676 static inline void 677 xpc_wakeup_channel_mgr(struct xpc_partition *part) 678 { 679 if (atomic_inc_return(&part->channel_mgr_requests) == 1) 680 wake_up(&part->channel_mgr_wq); 681 } 682 683 /* 684 * These next two inlines are used to keep us from tearing down a channel's 685 * msg queues while a thread may be referencing them. 686 */ 687 static inline void 688 xpc_msgqueue_ref(struct xpc_channel *ch) 689 { 690 atomic_inc(&ch->references); 691 } 692 693 static inline void 694 xpc_msgqueue_deref(struct xpc_channel *ch) 695 { 696 s32 refs = atomic_dec_return(&ch->references); 697 698 DBUG_ON(refs < 0); 699 if (refs == 0) 700 xpc_wakeup_channel_mgr(&xpc_partitions[ch->partid]); 701 } 702 703 #define XPC_DISCONNECT_CHANNEL(_ch, _reason, _irqflgs) \ 704 xpc_disconnect_channel(__LINE__, _ch, _reason, _irqflgs) 705 706 /* 707 * These two inlines are used to keep us from tearing down a partition's 708 * setup infrastructure while a thread may be referencing it. 709 */ 710 static inline void 711 xpc_part_deref(struct xpc_partition *part) 712 { 713 s32 refs = atomic_dec_return(&part->references); 714 715 DBUG_ON(refs < 0); 716 if (refs == 0 && part->setup_state == XPC_P_WTEARDOWN) 717 wake_up(&part->teardown_wq); 718 } 719 720 static inline int 721 xpc_part_ref(struct xpc_partition *part) 722 { 723 int setup; 724 725 atomic_inc(&part->references); 726 setup = (part->setup_state == XPC_P_SETUP); 727 if (!setup) 728 xpc_part_deref(part); 729 730 return setup; 731 } 732 733 /* 734 * The following macro is to be used for the setting of the reason and 735 * reason_line fields in both the struct xpc_channel and struct xpc_partition 736 * structures. 737 */ 738 #define XPC_SET_REASON(_p, _reason, _line) \ 739 { \ 740 (_p)->reason = _reason; \ 741 (_p)->reason_line = _line; \ 742 } 743 744 /* 745 * This next set of inlines are used to keep track of when a partition is 746 * potentially engaged in accessing memory belonging to another partition. 747 */ 748 749 static inline void 750 xpc_mark_partition_engaged(struct xpc_partition *part) 751 { 752 unsigned long irq_flags; 753 AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa + 754 (XPC_ENGAGED_PARTITIONS_AMO * 755 sizeof(AMO_t))); 756 757 local_irq_save(irq_flags); 758 759 /* set bit corresponding to our partid in remote partition's AMO */ 760 FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR, 761 (1UL << sn_partition_id)); 762 /* 763 * We must always use the nofault function regardless of whether we 764 * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we 765 * didn't, we'd never know that the other partition is down and would 766 * keep sending IPIs and AMOs to it until the heartbeat times out. 767 */ 768 (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo-> 769 variable), 770 xp_nofault_PIOR_target)); 771 772 local_irq_restore(irq_flags); 773 } 774 775 static inline void 776 xpc_mark_partition_disengaged(struct xpc_partition *part) 777 { 778 unsigned long irq_flags; 779 AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa + 780 (XPC_ENGAGED_PARTITIONS_AMO * 781 sizeof(AMO_t))); 782 783 local_irq_save(irq_flags); 784 785 /* clear bit corresponding to our partid in remote partition's AMO */ 786 FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND, 787 ~(1UL << sn_partition_id)); 788 /* 789 * We must always use the nofault function regardless of whether we 790 * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we 791 * didn't, we'd never know that the other partition is down and would 792 * keep sending IPIs and AMOs to it until the heartbeat times out. 793 */ 794 (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo-> 795 variable), 796 xp_nofault_PIOR_target)); 797 798 local_irq_restore(irq_flags); 799 } 800 801 static inline void 802 xpc_request_partition_disengage(struct xpc_partition *part) 803 { 804 unsigned long irq_flags; 805 AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa + 806 (XPC_DISENGAGE_REQUEST_AMO * sizeof(AMO_t))); 807 808 local_irq_save(irq_flags); 809 810 /* set bit corresponding to our partid in remote partition's AMO */ 811 FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR, 812 (1UL << sn_partition_id)); 813 /* 814 * We must always use the nofault function regardless of whether we 815 * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we 816 * didn't, we'd never know that the other partition is down and would 817 * keep sending IPIs and AMOs to it until the heartbeat times out. 818 */ 819 (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo-> 820 variable), 821 xp_nofault_PIOR_target)); 822 823 local_irq_restore(irq_flags); 824 } 825 826 static inline void 827 xpc_cancel_partition_disengage_request(struct xpc_partition *part) 828 { 829 unsigned long irq_flags; 830 AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa + 831 (XPC_DISENGAGE_REQUEST_AMO * sizeof(AMO_t))); 832 833 local_irq_save(irq_flags); 834 835 /* clear bit corresponding to our partid in remote partition's AMO */ 836 FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND, 837 ~(1UL << sn_partition_id)); 838 /* 839 * We must always use the nofault function regardless of whether we 840 * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we 841 * didn't, we'd never know that the other partition is down and would 842 * keep sending IPIs and AMOs to it until the heartbeat times out. 843 */ 844 (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo-> 845 variable), 846 xp_nofault_PIOR_target)); 847 848 local_irq_restore(irq_flags); 849 } 850 851 static inline u64 852 xpc_partition_engaged(u64 partid_mask) 853 { 854 AMO_t *amo = xpc_vars->amos_page + XPC_ENGAGED_PARTITIONS_AMO; 855 856 /* return our partition's AMO variable ANDed with partid_mask */ 857 return (FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_LOAD) & 858 partid_mask); 859 } 860 861 static inline u64 862 xpc_partition_disengage_requested(u64 partid_mask) 863 { 864 AMO_t *amo = xpc_vars->amos_page + XPC_DISENGAGE_REQUEST_AMO; 865 866 /* return our partition's AMO variable ANDed with partid_mask */ 867 return (FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_LOAD) & 868 partid_mask); 869 } 870 871 static inline void 872 xpc_clear_partition_engaged(u64 partid_mask) 873 { 874 AMO_t *amo = xpc_vars->amos_page + XPC_ENGAGED_PARTITIONS_AMO; 875 876 /* clear bit(s) based on partid_mask in our partition's AMO */ 877 FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND, 878 ~partid_mask); 879 } 880 881 static inline void 882 xpc_clear_partition_disengage_request(u64 partid_mask) 883 { 884 AMO_t *amo = xpc_vars->amos_page + XPC_DISENGAGE_REQUEST_AMO; 885 886 /* clear bit(s) based on partid_mask in our partition's AMO */ 887 FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND, 888 ~partid_mask); 889 } 890 891 /* 892 * The following set of macros and inlines are used for the sending and 893 * receiving of IPIs (also known as IRQs). There are two flavors of IPIs, 894 * one that is associated with partition activity (SGI_XPC_ACTIVATE) and 895 * the other that is associated with channel activity (SGI_XPC_NOTIFY). 896 */ 897 898 static inline u64 899 xpc_IPI_receive(AMO_t *amo) 900 { 901 return FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_CLEAR); 902 } 903 904 static inline enum xp_retval 905 xpc_IPI_send(AMO_t *amo, u64 flag, int nasid, int phys_cpuid, int vector) 906 { 907 int ret = 0; 908 unsigned long irq_flags; 909 910 local_irq_save(irq_flags); 911 912 FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR, flag); 913 sn_send_IPI_phys(nasid, phys_cpuid, vector, 0); 914 915 /* 916 * We must always use the nofault function regardless of whether we 917 * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we 918 * didn't, we'd never know that the other partition is down and would 919 * keep sending IPIs and AMOs to it until the heartbeat times out. 920 */ 921 ret = xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->variable), 922 xp_nofault_PIOR_target)); 923 924 local_irq_restore(irq_flags); 925 926 return ((ret == 0) ? xpSuccess : xpPioReadError); 927 } 928 929 /* 930 * IPIs associated with SGI_XPC_ACTIVATE IRQ. 931 */ 932 933 /* 934 * Flag the appropriate AMO variable and send an IPI to the specified node. 935 */ 936 static inline void 937 xpc_activate_IRQ_send(u64 amos_page_pa, int from_nasid, int to_nasid, 938 int to_phys_cpuid) 939 { 940 int w_index = XPC_NASID_W_INDEX(from_nasid); 941 int b_index = XPC_NASID_B_INDEX(from_nasid); 942 AMO_t *amos = (AMO_t *)__va(amos_page_pa + 943 (XPC_ACTIVATE_IRQ_AMOS * sizeof(AMO_t))); 944 945 (void)xpc_IPI_send(&amos[w_index], (1UL << b_index), to_nasid, 946 to_phys_cpuid, SGI_XPC_ACTIVATE); 947 } 948 949 static inline void 950 xpc_IPI_send_activate(struct xpc_vars *vars) 951 { 952 xpc_activate_IRQ_send(vars->amos_page_pa, cnodeid_to_nasid(0), 953 vars->act_nasid, vars->act_phys_cpuid); 954 } 955 956 static inline void 957 xpc_IPI_send_activated(struct xpc_partition *part) 958 { 959 xpc_activate_IRQ_send(part->remote_amos_page_pa, cnodeid_to_nasid(0), 960 part->remote_act_nasid, 961 part->remote_act_phys_cpuid); 962 } 963 964 static inline void 965 xpc_IPI_send_reactivate(struct xpc_partition *part) 966 { 967 xpc_activate_IRQ_send(xpc_vars->amos_page_pa, part->reactivate_nasid, 968 xpc_vars->act_nasid, xpc_vars->act_phys_cpuid); 969 } 970 971 static inline void 972 xpc_IPI_send_disengage(struct xpc_partition *part) 973 { 974 xpc_activate_IRQ_send(part->remote_amos_page_pa, cnodeid_to_nasid(0), 975 part->remote_act_nasid, 976 part->remote_act_phys_cpuid); 977 } 978 979 /* 980 * IPIs associated with SGI_XPC_NOTIFY IRQ. 981 */ 982 983 /* 984 * Send an IPI to the remote partition that is associated with the 985 * specified channel. 986 */ 987 #define XPC_NOTIFY_IRQ_SEND(_ch, _ipi_f, _irq_f) \ 988 xpc_notify_IRQ_send(_ch, _ipi_f, #_ipi_f, _irq_f) 989 990 static inline void 991 xpc_notify_IRQ_send(struct xpc_channel *ch, u8 ipi_flag, char *ipi_flag_string, 992 unsigned long *irq_flags) 993 { 994 struct xpc_partition *part = &xpc_partitions[ch->partid]; 995 enum xp_retval ret; 996 997 if (likely(part->act_state != XPC_P_DEACTIVATING)) { 998 ret = xpc_IPI_send(part->remote_IPI_amo_va, 999 (u64)ipi_flag << (ch->number * 8), 1000 part->remote_IPI_nasid, 1001 part->remote_IPI_phys_cpuid, SGI_XPC_NOTIFY); 1002 dev_dbg(xpc_chan, "%s sent to partid=%d, channel=%d, ret=%d\n", 1003 ipi_flag_string, ch->partid, ch->number, ret); 1004 if (unlikely(ret != xpSuccess)) { 1005 if (irq_flags != NULL) 1006 spin_unlock_irqrestore(&ch->lock, *irq_flags); 1007 XPC_DEACTIVATE_PARTITION(part, ret); 1008 if (irq_flags != NULL) 1009 spin_lock_irqsave(&ch->lock, *irq_flags); 1010 } 1011 } 1012 } 1013 1014 /* 1015 * Make it look like the remote partition, which is associated with the 1016 * specified channel, sent us an IPI. This faked IPI will be handled 1017 * by xpc_dropped_IPI_check(). 1018 */ 1019 #define XPC_NOTIFY_IRQ_SEND_LOCAL(_ch, _ipi_f) \ 1020 xpc_notify_IRQ_send_local(_ch, _ipi_f, #_ipi_f) 1021 1022 static inline void 1023 xpc_notify_IRQ_send_local(struct xpc_channel *ch, u8 ipi_flag, 1024 char *ipi_flag_string) 1025 { 1026 struct xpc_partition *part = &xpc_partitions[ch->partid]; 1027 1028 FETCHOP_STORE_OP(TO_AMO((u64)&part->local_IPI_amo_va->variable), 1029 FETCHOP_OR, ((u64)ipi_flag << (ch->number * 8))); 1030 dev_dbg(xpc_chan, "%s sent local from partid=%d, channel=%d\n", 1031 ipi_flag_string, ch->partid, ch->number); 1032 } 1033 1034 /* 1035 * The sending and receiving of IPIs includes the setting of an AMO variable 1036 * to indicate the reason the IPI was sent. The 64-bit variable is divided 1037 * up into eight bytes, ordered from right to left. Byte zero pertains to 1038 * channel 0, byte one to channel 1, and so on. Each byte is described by 1039 * the following IPI flags. 1040 */ 1041 1042 #define XPC_IPI_CLOSEREQUEST 0x01 1043 #define XPC_IPI_CLOSEREPLY 0x02 1044 #define XPC_IPI_OPENREQUEST 0x04 1045 #define XPC_IPI_OPENREPLY 0x08 1046 #define XPC_IPI_MSGREQUEST 0x10 1047 1048 /* given an AMO variable and a channel#, get its associated IPI flags */ 1049 #define XPC_GET_IPI_FLAGS(_amo, _c) ((u8) (((_amo) >> ((_c) * 8)) & 0xff)) 1050 #define XPC_SET_IPI_FLAGS(_amo, _c, _f) (_amo) |= ((u64) (_f) << ((_c) * 8)) 1051 1052 #define XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(_amo) ((_amo) & 0x0f0f0f0f0f0f0f0fUL) 1053 #define XPC_ANY_MSG_IPI_FLAGS_SET(_amo) ((_amo) & 0x1010101010101010UL) 1054 1055 static inline void 1056 xpc_IPI_send_closerequest(struct xpc_channel *ch, unsigned long *irq_flags) 1057 { 1058 struct xpc_openclose_args *args = ch->local_openclose_args; 1059 1060 args->reason = ch->reason; 1061 1062 XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_CLOSEREQUEST, irq_flags); 1063 } 1064 1065 static inline void 1066 xpc_IPI_send_closereply(struct xpc_channel *ch, unsigned long *irq_flags) 1067 { 1068 XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_CLOSEREPLY, irq_flags); 1069 } 1070 1071 static inline void 1072 xpc_IPI_send_openrequest(struct xpc_channel *ch, unsigned long *irq_flags) 1073 { 1074 struct xpc_openclose_args *args = ch->local_openclose_args; 1075 1076 args->msg_size = ch->msg_size; 1077 args->local_nentries = ch->local_nentries; 1078 1079 XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_OPENREQUEST, irq_flags); 1080 } 1081 1082 static inline void 1083 xpc_IPI_send_openreply(struct xpc_channel *ch, unsigned long *irq_flags) 1084 { 1085 struct xpc_openclose_args *args = ch->local_openclose_args; 1086 1087 args->remote_nentries = ch->remote_nentries; 1088 args->local_nentries = ch->local_nentries; 1089 args->local_msgqueue_pa = __pa(ch->local_msgqueue); 1090 1091 XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_OPENREPLY, irq_flags); 1092 } 1093 1094 static inline void 1095 xpc_IPI_send_msgrequest(struct xpc_channel *ch) 1096 { 1097 XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_MSGREQUEST, NULL); 1098 } 1099 1100 static inline void 1101 xpc_IPI_send_local_msgrequest(struct xpc_channel *ch) 1102 { 1103 XPC_NOTIFY_IRQ_SEND_LOCAL(ch, XPC_IPI_MSGREQUEST); 1104 } 1105 1106 /* 1107 * Memory for XPC's AMO variables is allocated by the MSPEC driver. These 1108 * pages are located in the lowest granule. The lowest granule uses 4k pages 1109 * for cached references and an alternate TLB handler to never provide a 1110 * cacheable mapping for the entire region. This will prevent speculative 1111 * reading of cached copies of our lines from being issued which will cause 1112 * a PI FSB Protocol error to be generated by the SHUB. For XPC, we need 64 1113 * AMO variables (based on XP_MAX_PARTITIONS) for message notification and an 1114 * additional 128 AMO variables (based on XP_NASID_MASK_WORDS) for partition 1115 * activation and 2 AMO variables for partition deactivation. 1116 */ 1117 static inline AMO_t * 1118 xpc_IPI_init(int index) 1119 { 1120 AMO_t *amo = xpc_vars->amos_page + index; 1121 1122 (void)xpc_IPI_receive(amo); /* clear AMO variable */ 1123 return amo; 1124 } 1125 1126 static inline enum xp_retval 1127 xpc_map_bte_errors(bte_result_t error) 1128 { 1129 return ((error == BTE_SUCCESS) ? xpSuccess : xpBteCopyError); 1130 } 1131 1132 /* 1133 * Check to see if there is any channel activity to/from the specified 1134 * partition. 1135 */ 1136 static inline void 1137 xpc_check_for_channel_activity(struct xpc_partition *part) 1138 { 1139 u64 IPI_amo; 1140 unsigned long irq_flags; 1141 1142 IPI_amo = xpc_IPI_receive(part->local_IPI_amo_va); 1143 if (IPI_amo == 0) 1144 return; 1145 1146 spin_lock_irqsave(&part->IPI_lock, irq_flags); 1147 part->local_IPI_amo |= IPI_amo; 1148 spin_unlock_irqrestore(&part->IPI_lock, irq_flags); 1149 1150 dev_dbg(xpc_chan, "received IPI from partid=%d, IPI_amo=0x%lx\n", 1151 XPC_PARTID(part), IPI_amo); 1152 1153 xpc_wakeup_channel_mgr(part); 1154 } 1155 1156 #endif /* _DRIVERS_MISC_SGIXP_XPC_H */ 1157