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) 2004-2006 Silicon Graphics, Inc. All Rights Reserved. 7 */ 8 9 10/* 11 * Cross Partition Communication (XPC) structures and macros. 12 */ 13 14#ifndef _ASM_IA64_SN_XPC_H 15#define _ASM_IA64_SN_XPC_H 16 17 18#include <linux/interrupt.h> 19#include <linux/sysctl.h> 20#include <linux/device.h> 21#include <linux/mutex.h> 22#include <linux/completion.h> 23#include <asm/pgtable.h> 24#include <asm/processor.h> 25#include <asm/sn/bte.h> 26#include <asm/sn/clksupport.h> 27#include <asm/sn/addrs.h> 28#include <asm/sn/mspec.h> 29#include <asm/sn/shub_mmr.h> 30#include <asm/sn/xp.h> 31 32 33/* 34 * XPC Version numbers consist of a major and minor number. XPC can always 35 * talk to versions with same major #, and never talk to versions with a 36 * different major #. 37 */ 38#define _XPC_VERSION(_maj, _min) (((_maj) << 4) | ((_min) & 0xf)) 39#define XPC_VERSION_MAJOR(_v) ((_v) >> 4) 40#define XPC_VERSION_MINOR(_v) ((_v) & 0xf) 41 42 43/* 44 * The next macros define word or bit representations for given 45 * C-brick nasid in either the SAL provided bit array representing 46 * nasids in the partition/machine or the AMO_t array used for 47 * inter-partition initiation communications. 48 * 49 * For SN2 machines, C-Bricks are alway even numbered NASIDs. As 50 * such, some space will be saved by insisting that nasid information 51 * passed from SAL always be packed for C-Bricks and the 52 * cross-partition interrupts use the same packing scheme. 53 */ 54#define XPC_NASID_W_INDEX(_n) (((_n) / 64) / 2) 55#define XPC_NASID_B_INDEX(_n) (((_n) / 2) & (64 - 1)) 56#define XPC_NASID_IN_ARRAY(_n, _p) ((_p)[XPC_NASID_W_INDEX(_n)] & \ 57 (1UL << XPC_NASID_B_INDEX(_n))) 58#define XPC_NASID_FROM_W_B(_w, _b) (((_w) * 64 + (_b)) * 2) 59 60#define XPC_HB_DEFAULT_INTERVAL 5 /* incr HB every x secs */ 61#define XPC_HB_CHECK_DEFAULT_INTERVAL 20 /* check HB every x secs */ 62 63/* define the process name of HB checker and the CPU it is pinned to */ 64#define XPC_HB_CHECK_THREAD_NAME "xpc_hb" 65#define XPC_HB_CHECK_CPU 0 66 67/* define the process name of the discovery thread */ 68#define XPC_DISCOVERY_THREAD_NAME "xpc_discovery" 69 70 71/* 72 * the reserved page 73 * 74 * SAL reserves one page of memory per partition for XPC. Though a full page 75 * in length (16384 bytes), its starting address is not page aligned, but it 76 * is cacheline aligned. The reserved page consists of the following: 77 * 78 * reserved page header 79 * 80 * The first cacheline of the reserved page contains the header 81 * (struct xpc_rsvd_page). Before SAL initialization has completed, 82 * SAL has set up the following fields of the reserved page header: 83 * SAL_signature, SAL_version, partid, and nasids_size. The other 84 * fields are set up by XPC. (xpc_rsvd_page points to the local 85 * partition's reserved page.) 86 * 87 * part_nasids mask 88 * mach_nasids mask 89 * 90 * SAL also sets up two bitmaps (or masks), one that reflects the actual 91 * nasids in this partition (part_nasids), and the other that reflects 92 * the actual nasids in the entire machine (mach_nasids). We're only 93 * interested in the even numbered nasids (which contain the processors 94 * and/or memory), so we only need half as many bits to represent the 95 * nasids. The part_nasids mask is located starting at the first cacheline 96 * following the reserved page header. The mach_nasids mask follows right 97 * after the part_nasids mask. The size in bytes of each mask is reflected 98 * by the reserved page header field 'nasids_size'. (Local partition's 99 * mask pointers are xpc_part_nasids and xpc_mach_nasids.) 100 * 101 * vars 102 * vars part 103 * 104 * Immediately following the mach_nasids mask are the XPC variables 105 * required by other partitions. First are those that are generic to all 106 * partitions (vars), followed on the next available cacheline by those 107 * which are partition specific (vars part). These are setup by XPC. 108 * (Local partition's vars pointers are xpc_vars and xpc_vars_part.) 109 * 110 * Note: Until vars_pa is set, the partition XPC code has not been initialized. 111 */ 112struct xpc_rsvd_page { 113 u64 SAL_signature; /* SAL: unique signature */ 114 u64 SAL_version; /* SAL: version */ 115 u8 partid; /* SAL: partition ID */ 116 u8 version; 117 u8 pad1[6]; /* align to next u64 in cacheline */ 118 volatile u64 vars_pa; 119 struct timespec stamp; /* time when reserved page was setup by XPC */ 120 u64 pad2[9]; /* align to last u64 in cacheline */ 121 u64 nasids_size; /* SAL: size of each nasid mask in bytes */ 122}; 123 124#define XPC_RP_VERSION _XPC_VERSION(1,1) /* version 1.1 of the reserved page */ 125 126#define XPC_SUPPORTS_RP_STAMP(_version) \ 127 (_version >= _XPC_VERSION(1,1)) 128 129/* 130 * compare stamps - the return value is: 131 * 132 * < 0, if stamp1 < stamp2 133 * = 0, if stamp1 == stamp2 134 * > 0, if stamp1 > stamp2 135 */ 136static inline int 137xpc_compare_stamps(struct timespec *stamp1, struct timespec *stamp2) 138{ 139 int ret; 140 141 142 if ((ret = stamp1->tv_sec - stamp2->tv_sec) == 0) { 143 ret = stamp1->tv_nsec - stamp2->tv_nsec; 144 } 145 return ret; 146} 147 148 149/* 150 * Define the structures by which XPC variables can be exported to other 151 * partitions. (There are two: struct xpc_vars and struct xpc_vars_part) 152 */ 153 154/* 155 * The following structure describes the partition generic variables 156 * needed by other partitions in order to properly initialize. 157 * 158 * struct xpc_vars version number also applies to struct xpc_vars_part. 159 * Changes to either structure and/or related functionality should be 160 * reflected by incrementing either the major or minor version numbers 161 * of struct xpc_vars. 162 */ 163struct xpc_vars { 164 u8 version; 165 u64 heartbeat; 166 u64 heartbeating_to_mask; 167 u64 heartbeat_offline; /* if 0, heartbeat should be changing */ 168 int act_nasid; 169 int act_phys_cpuid; 170 u64 vars_part_pa; 171 u64 amos_page_pa; /* paddr of page of AMOs from MSPEC driver */ 172 AMO_t *amos_page; /* vaddr of page of AMOs from MSPEC driver */ 173}; 174 175#define XPC_V_VERSION _XPC_VERSION(3,1) /* version 3.1 of the cross vars */ 176 177#define XPC_SUPPORTS_DISENGAGE_REQUEST(_version) \ 178 (_version >= _XPC_VERSION(3,1)) 179 180 181static inline int 182xpc_hb_allowed(partid_t partid, struct xpc_vars *vars) 183{ 184 return ((vars->heartbeating_to_mask & (1UL << partid)) != 0); 185} 186 187static inline void 188xpc_allow_hb(partid_t partid, struct xpc_vars *vars) 189{ 190 u64 old_mask, new_mask; 191 192 do { 193 old_mask = vars->heartbeating_to_mask; 194 new_mask = (old_mask | (1UL << partid)); 195 } while (cmpxchg(&vars->heartbeating_to_mask, old_mask, new_mask) != 196 old_mask); 197} 198 199static inline void 200xpc_disallow_hb(partid_t partid, struct xpc_vars *vars) 201{ 202 u64 old_mask, new_mask; 203 204 do { 205 old_mask = vars->heartbeating_to_mask; 206 new_mask = (old_mask & ~(1UL << partid)); 207 } while (cmpxchg(&vars->heartbeating_to_mask, old_mask, new_mask) != 208 old_mask); 209} 210 211 212/* 213 * The AMOs page consists of a number of AMO variables which are divided into 214 * four groups, The first two groups are used to identify an IRQ's sender. 215 * These two groups consist of 64 and 128 AMO variables respectively. The last 216 * two groups, consisting of just one AMO variable each, are used to identify 217 * the remote partitions that are currently engaged (from the viewpoint of 218 * the XPC running on the remote partition). 219 */ 220#define XPC_NOTIFY_IRQ_AMOS 0 221#define XPC_ACTIVATE_IRQ_AMOS (XPC_NOTIFY_IRQ_AMOS + XP_MAX_PARTITIONS) 222#define XPC_ENGAGED_PARTITIONS_AMO (XPC_ACTIVATE_IRQ_AMOS + XP_NASID_MASK_WORDS) 223#define XPC_DISENGAGE_REQUEST_AMO (XPC_ENGAGED_PARTITIONS_AMO + 1) 224 225 226/* 227 * The following structure describes the per partition specific variables. 228 * 229 * An array of these structures, one per partition, will be defined. As a 230 * partition becomes active XPC will copy the array entry corresponding to 231 * itself from that partition. It is desirable that the size of this 232 * structure evenly divide into a cacheline, such that none of the entries 233 * in this array crosses a cacheline boundary. As it is now, each entry 234 * occupies half a cacheline. 235 */ 236struct xpc_vars_part { 237 volatile u64 magic; 238 239 u64 openclose_args_pa; /* physical address of open and close args */ 240 u64 GPs_pa; /* physical address of Get/Put values */ 241 242 u64 IPI_amo_pa; /* physical address of IPI AMO_t structure */ 243 int IPI_nasid; /* nasid of where to send IPIs */ 244 int IPI_phys_cpuid; /* physical CPU ID of where to send IPIs */ 245 246 u8 nchannels; /* #of defined channels supported */ 247 248 u8 reserved[23]; /* pad to a full 64 bytes */ 249}; 250 251/* 252 * The vars_part MAGIC numbers play a part in the first contact protocol. 253 * 254 * MAGIC1 indicates that the per partition specific variables for a remote 255 * partition have been initialized by this partition. 256 * 257 * MAGIC2 indicates that this partition has pulled the remote partititions 258 * per partition variables that pertain to this partition. 259 */ 260#define XPC_VP_MAGIC1 0x0053524156435058L /* 'XPCVARS\0'L (little endian) */ 261#define XPC_VP_MAGIC2 0x0073726176435058L /* 'XPCvars\0'L (little endian) */ 262 263 264/* the reserved page sizes and offsets */ 265 266#define XPC_RP_HEADER_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_rsvd_page)) 267#define XPC_RP_VARS_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_vars)) 268 269#define XPC_RP_PART_NASIDS(_rp) (u64 *) ((u8 *) _rp + XPC_RP_HEADER_SIZE) 270#define XPC_RP_MACH_NASIDS(_rp) (XPC_RP_PART_NASIDS(_rp) + xp_nasid_mask_words) 271#define XPC_RP_VARS(_rp) ((struct xpc_vars *) XPC_RP_MACH_NASIDS(_rp) + xp_nasid_mask_words) 272#define XPC_RP_VARS_PART(_rp) (struct xpc_vars_part *) ((u8 *) XPC_RP_VARS(rp) + XPC_RP_VARS_SIZE) 273 274 275/* 276 * Functions registered by add_timer() or called by kernel_thread() only 277 * allow for a single 64-bit argument. The following macros can be used to 278 * pack and unpack two (32-bit, 16-bit or 8-bit) arguments into or out from 279 * the passed argument. 280 */ 281#define XPC_PACK_ARGS(_arg1, _arg2) \ 282 ((((u64) _arg1) & 0xffffffff) | \ 283 ((((u64) _arg2) & 0xffffffff) << 32)) 284 285#define XPC_UNPACK_ARG1(_args) (((u64) _args) & 0xffffffff) 286#define XPC_UNPACK_ARG2(_args) ((((u64) _args) >> 32) & 0xffffffff) 287 288 289 290/* 291 * Define a Get/Put value pair (pointers) used with a message queue. 292 */ 293struct xpc_gp { 294 volatile s64 get; /* Get value */ 295 volatile s64 put; /* Put value */ 296}; 297 298#define XPC_GP_SIZE \ 299 L1_CACHE_ALIGN(sizeof(struct xpc_gp) * XPC_NCHANNELS) 300 301 302 303/* 304 * Define a structure that contains arguments associated with opening and 305 * closing a channel. 306 */ 307struct xpc_openclose_args { 308 u16 reason; /* reason why channel is closing */ 309 u16 msg_size; /* sizeof each message entry */ 310 u16 remote_nentries; /* #of message entries in remote msg queue */ 311 u16 local_nentries; /* #of message entries in local msg queue */ 312 u64 local_msgqueue_pa; /* physical address of local message queue */ 313}; 314 315#define XPC_OPENCLOSE_ARGS_SIZE \ 316 L1_CACHE_ALIGN(sizeof(struct xpc_openclose_args) * XPC_NCHANNELS) 317 318 319 320/* struct xpc_msg flags */ 321 322#define XPC_M_DONE 0x01 /* msg has been received/consumed */ 323#define XPC_M_READY 0x02 /* msg is ready to be sent */ 324#define XPC_M_INTERRUPT 0x04 /* send interrupt when msg consumed */ 325 326 327#define XPC_MSG_ADDRESS(_payload) \ 328 ((struct xpc_msg *)((u8 *)(_payload) - XPC_MSG_PAYLOAD_OFFSET)) 329 330 331 332/* 333 * Defines notify entry. 334 * 335 * This is used to notify a message's sender that their message was received 336 * and consumed by the intended recipient. 337 */ 338struct xpc_notify { 339 volatile u8 type; /* type of notification */ 340 341 /* the following two fields are only used if type == XPC_N_CALL */ 342 xpc_notify_func func; /* user's notify function */ 343 void *key; /* pointer to user's key */ 344}; 345 346/* struct xpc_notify type of notification */ 347 348#define XPC_N_CALL 0x01 /* notify function provided by user */ 349 350 351 352/* 353 * Define the structure that manages all the stuff required by a channel. In 354 * particular, they are used to manage the messages sent across the channel. 355 * 356 * This structure is private to a partition, and is NOT shared across the 357 * partition boundary. 358 * 359 * There is an array of these structures for each remote partition. It is 360 * allocated at the time a partition becomes active. The array contains one 361 * of these structures for each potential channel connection to that partition. 362 * 363 * Each of these structures manages two message queues (circular buffers). 364 * They are allocated at the time a channel connection is made. One of 365 * these message queues (local_msgqueue) holds the locally created messages 366 * that are destined for the remote partition. The other of these message 367 * queues (remote_msgqueue) is a locally cached copy of the remote partition's 368 * own local_msgqueue. 369 * 370 * The following is a description of the Get/Put pointers used to manage these 371 * two message queues. Consider the local_msgqueue to be on one partition 372 * and the remote_msgqueue to be its cached copy on another partition. A 373 * description of what each of the lettered areas contains is included. 374 * 375 * 376 * local_msgqueue remote_msgqueue 377 * 378 * |/////////| |/////////| 379 * w_remote_GP.get --> +---------+ |/////////| 380 * | F | |/////////| 381 * remote_GP.get --> +---------+ +---------+ <-- local_GP->get 382 * | | | | 383 * | | | E | 384 * | | | | 385 * | | +---------+ <-- w_local_GP.get 386 * | B | |/////////| 387 * | | |////D////| 388 * | | |/////////| 389 * | | +---------+ <-- w_remote_GP.put 390 * | | |////C////| 391 * local_GP->put --> +---------+ +---------+ <-- remote_GP.put 392 * | | |/////////| 393 * | A | |/////////| 394 * | | |/////////| 395 * w_local_GP.put --> +---------+ |/////////| 396 * |/////////| |/////////| 397 * 398 * 399 * ( remote_GP.[get|put] are cached copies of the remote 400 * partition's local_GP->[get|put], and thus their values can 401 * lag behind their counterparts on the remote partition. ) 402 * 403 * 404 * A - Messages that have been allocated, but have not yet been sent to the 405 * remote partition. 406 * 407 * B - Messages that have been sent, but have not yet been acknowledged by the 408 * remote partition as having been received. 409 * 410 * C - Area that needs to be prepared for the copying of sent messages, by 411 * the clearing of the message flags of any previously received messages. 412 * 413 * D - Area into which sent messages are to be copied from the remote 414 * partition's local_msgqueue and then delivered to their intended 415 * recipients. [ To allow for a multi-message copy, another pointer 416 * (next_msg_to_pull) has been added to keep track of the next message 417 * number needing to be copied (pulled). It chases after w_remote_GP.put. 418 * Any messages lying between w_local_GP.get and next_msg_to_pull have 419 * been copied and are ready to be delivered. ] 420 * 421 * E - Messages that have been copied and delivered, but have not yet been 422 * acknowledged by the recipient as having been received. 423 * 424 * F - Messages that have been acknowledged, but XPC has not yet notified the 425 * sender that the message was received by its intended recipient. 426 * This is also an area that needs to be prepared for the allocating of 427 * new messages, by the clearing of the message flags of the acknowledged 428 * messages. 429 */ 430struct xpc_channel { 431 partid_t partid; /* ID of remote partition connected */ 432 spinlock_t lock; /* lock for updating this structure */ 433 u32 flags; /* general flags */ 434 435 enum xpc_retval reason; /* reason why channel is disconnect'g */ 436 int reason_line; /* line# disconnect initiated from */ 437 438 u16 number; /* channel # */ 439 440 u16 msg_size; /* sizeof each msg entry */ 441 u16 local_nentries; /* #of msg entries in local msg queue */ 442 u16 remote_nentries; /* #of msg entries in remote msg queue*/ 443 444 void *local_msgqueue_base; /* base address of kmalloc'd space */ 445 struct xpc_msg *local_msgqueue; /* local message queue */ 446 void *remote_msgqueue_base; /* base address of kmalloc'd space */ 447 struct xpc_msg *remote_msgqueue;/* cached copy of remote partition's */ 448 /* local message queue */ 449 u64 remote_msgqueue_pa; /* phys addr of remote partition's */ 450 /* local message queue */ 451 452 atomic_t references; /* #of external references to queues */ 453 454 atomic_t n_on_msg_allocate_wq; /* #on msg allocation wait queue */ 455 wait_queue_head_t msg_allocate_wq; /* msg allocation wait queue */ 456 457 u8 delayed_IPI_flags; /* IPI flags received, but delayed */ 458 /* action until channel disconnected */ 459 460 /* queue of msg senders who want to be notified when msg received */ 461 462 atomic_t n_to_notify; /* #of msg senders to notify */ 463 struct xpc_notify *notify_queue;/* notify queue for messages sent */ 464 465 xpc_channel_func func; /* user's channel function */ 466 void *key; /* pointer to user's key */ 467 468 struct mutex msg_to_pull_mutex; /* next msg to pull serialization */ 469 struct completion wdisconnect_wait; /* wait for channel disconnect */ 470 471 struct xpc_openclose_args *local_openclose_args; /* args passed on */ 472 /* opening or closing of channel */ 473 474 /* various flavors of local and remote Get/Put values */ 475 476 struct xpc_gp *local_GP; /* local Get/Put values */ 477 struct xpc_gp remote_GP; /* remote Get/Put values */ 478 struct xpc_gp w_local_GP; /* working local Get/Put values */ 479 struct xpc_gp w_remote_GP; /* working remote Get/Put values */ 480 s64 next_msg_to_pull; /* Put value of next msg to pull */ 481 482 /* kthread management related fields */ 483 484// >>> rethink having kthreads_assigned_limit and kthreads_idle_limit; perhaps 485// >>> allow the assigned limit be unbounded and let the idle limit be dynamic 486// >>> dependent on activity over the last interval of time 487 atomic_t kthreads_assigned; /* #of kthreads assigned to channel */ 488 u32 kthreads_assigned_limit; /* limit on #of kthreads assigned */ 489 atomic_t kthreads_idle; /* #of kthreads idle waiting for work */ 490 u32 kthreads_idle_limit; /* limit on #of kthreads idle */ 491 atomic_t kthreads_active; /* #of kthreads actively working */ 492 // >>> following field is temporary 493 u32 kthreads_created; /* total #of kthreads created */ 494 495 wait_queue_head_t idle_wq; /* idle kthread wait queue */ 496 497} ____cacheline_aligned; 498 499 500/* struct xpc_channel flags */ 501 502#define XPC_C_WASCONNECTED 0x00000001 /* channel was connected */ 503 504#define XPC_C_ROPENREPLY 0x00000002 /* remote open channel reply */ 505#define XPC_C_OPENREPLY 0x00000004 /* local open channel reply */ 506#define XPC_C_ROPENREQUEST 0x00000008 /* remote open channel request */ 507#define XPC_C_OPENREQUEST 0x00000010 /* local open channel request */ 508 509#define XPC_C_SETUP 0x00000020 /* channel's msgqueues are alloc'd */ 510#define XPC_C_CONNECTEDCALLOUT 0x00000040 /* connected callout initiated */ 511#define XPC_C_CONNECTEDCALLOUT_MADE \ 512 0x00000080 /* connected callout completed */ 513#define XPC_C_CONNECTED 0x00000100 /* local channel is connected */ 514#define XPC_C_CONNECTING 0x00000200 /* channel is being connected */ 515 516#define XPC_C_RCLOSEREPLY 0x00000400 /* remote close channel reply */ 517#define XPC_C_CLOSEREPLY 0x00000800 /* local close channel reply */ 518#define XPC_C_RCLOSEREQUEST 0x00001000 /* remote close channel request */ 519#define XPC_C_CLOSEREQUEST 0x00002000 /* local close channel request */ 520 521#define XPC_C_DISCONNECTED 0x00004000 /* channel is disconnected */ 522#define XPC_C_DISCONNECTING 0x00008000 /* channel is being disconnected */ 523#define XPC_C_DISCONNECTINGCALLOUT \ 524 0x00010000 /* disconnecting callout initiated */ 525#define XPC_C_DISCONNECTINGCALLOUT_MADE \ 526 0x00020000 /* disconnecting callout completed */ 527#define XPC_C_WDISCONNECT 0x00040000 /* waiting for channel disconnect */ 528 529 530 531/* 532 * Manages channels on a partition basis. There is one of these structures 533 * for each partition (a partition will never utilize the structure that 534 * represents itself). 535 */ 536struct xpc_partition { 537 538 /* XPC HB infrastructure */ 539 540 u8 remote_rp_version; /* version# of partition's rsvd pg */ 541 struct timespec remote_rp_stamp;/* time when rsvd pg was initialized */ 542 u64 remote_rp_pa; /* phys addr of partition's rsvd pg */ 543 u64 remote_vars_pa; /* phys addr of partition's vars */ 544 u64 remote_vars_part_pa; /* phys addr of partition's vars part */ 545 u64 last_heartbeat; /* HB at last read */ 546 u64 remote_amos_page_pa; /* phys addr of partition's amos page */ 547 int remote_act_nasid; /* active part's act/deact nasid */ 548 int remote_act_phys_cpuid; /* active part's act/deact phys cpuid */ 549 u32 act_IRQ_rcvd; /* IRQs since activation */ 550 spinlock_t act_lock; /* protect updating of act_state */ 551 u8 act_state; /* from XPC HB viewpoint */ 552 u8 remote_vars_version; /* version# of partition's vars */ 553 enum xpc_retval reason; /* reason partition is deactivating */ 554 int reason_line; /* line# deactivation initiated from */ 555 int reactivate_nasid; /* nasid in partition to reactivate */ 556 557 unsigned long disengage_request_timeout; /* timeout in jiffies */ 558 struct timer_list disengage_request_timer; 559 560 561 /* XPC infrastructure referencing and teardown control */ 562 563 volatile u8 setup_state; /* infrastructure setup state */ 564 wait_queue_head_t teardown_wq; /* kthread waiting to teardown infra */ 565 atomic_t references; /* #of references to infrastructure */ 566 567 568 /* 569 * NONE OF THE PRECEDING FIELDS OF THIS STRUCTURE WILL BE CLEARED WHEN 570 * XPC SETS UP THE NECESSARY INFRASTRUCTURE TO SUPPORT CROSS PARTITION 571 * COMMUNICATION. ALL OF THE FOLLOWING FIELDS WILL BE CLEARED. (THE 572 * 'nchannels' FIELD MUST BE THE FIRST OF THE FIELDS TO BE CLEARED.) 573 */ 574 575 576 u8 nchannels; /* #of defined channels supported */ 577 atomic_t nchannels_active; /* #of channels that are not DISCONNECTED */ 578 atomic_t nchannels_engaged;/* #of channels engaged with remote part */ 579 struct xpc_channel *channels;/* array of channel structures */ 580 581 void *local_GPs_base; /* base address of kmalloc'd space */ 582 struct xpc_gp *local_GPs; /* local Get/Put values */ 583 void *remote_GPs_base; /* base address of kmalloc'd space */ 584 struct xpc_gp *remote_GPs;/* copy of remote partition's local Get/Put */ 585 /* values */ 586 u64 remote_GPs_pa; /* phys address of remote partition's local */ 587 /* Get/Put values */ 588 589 590 /* fields used to pass args when opening or closing a channel */ 591 592 void *local_openclose_args_base; /* base address of kmalloc'd space */ 593 struct xpc_openclose_args *local_openclose_args; /* local's args */ 594 void *remote_openclose_args_base; /* base address of kmalloc'd space */ 595 struct xpc_openclose_args *remote_openclose_args; /* copy of remote's */ 596 /* args */ 597 u64 remote_openclose_args_pa; /* phys addr of remote's args */ 598 599 600 /* IPI sending, receiving and handling related fields */ 601 602 int remote_IPI_nasid; /* nasid of where to send IPIs */ 603 int remote_IPI_phys_cpuid; /* phys CPU ID of where to send IPIs */ 604 AMO_t *remote_IPI_amo_va; /* address of remote IPI AMO_t structure */ 605 606 AMO_t *local_IPI_amo_va; /* address of IPI AMO_t structure */ 607 u64 local_IPI_amo; /* IPI amo flags yet to be handled */ 608 char IPI_owner[8]; /* IPI owner's name */ 609 struct timer_list dropped_IPI_timer; /* dropped IPI timer */ 610 611 spinlock_t IPI_lock; /* IPI handler lock */ 612 613 614 /* channel manager related fields */ 615 616 atomic_t channel_mgr_requests; /* #of requests to activate chan mgr */ 617 wait_queue_head_t channel_mgr_wq; /* channel mgr's wait queue */ 618 619} ____cacheline_aligned; 620 621 622/* struct xpc_partition act_state values (for XPC HB) */ 623 624#define XPC_P_INACTIVE 0x00 /* partition is not active */ 625#define XPC_P_ACTIVATION_REQ 0x01 /* created thread to activate */ 626#define XPC_P_ACTIVATING 0x02 /* activation thread started */ 627#define XPC_P_ACTIVE 0x03 /* xpc_partition_up() was called */ 628#define XPC_P_DEACTIVATING 0x04 /* partition deactivation initiated */ 629 630 631#define XPC_DEACTIVATE_PARTITION(_p, _reason) \ 632 xpc_deactivate_partition(__LINE__, (_p), (_reason)) 633 634 635/* struct xpc_partition setup_state values */ 636 637#define XPC_P_UNSET 0x00 /* infrastructure was never setup */ 638#define XPC_P_SETUP 0x01 /* infrastructure is setup */ 639#define XPC_P_WTEARDOWN 0x02 /* waiting to teardown infrastructure */ 640#define XPC_P_TORNDOWN 0x03 /* infrastructure is torndown */ 641 642 643 644/* 645 * struct xpc_partition IPI_timer #of seconds to wait before checking for 646 * dropped IPIs. These occur whenever an IPI amo write doesn't complete until 647 * after the IPI was received. 648 */ 649#define XPC_P_DROPPED_IPI_WAIT (0.25 * HZ) 650 651 652/* number of seconds to wait for other partitions to disengage */ 653#define XPC_DISENGAGE_REQUEST_DEFAULT_TIMELIMIT 90 654 655/* interval in seconds to print 'waiting disengagement' messages */ 656#define XPC_DISENGAGE_PRINTMSG_INTERVAL 10 657 658 659#define XPC_PARTID(_p) ((partid_t) ((_p) - &xpc_partitions[0])) 660 661 662 663/* found in xp_main.c */ 664extern struct xpc_registration xpc_registrations[]; 665 666 667/* found in xpc_main.c */ 668extern struct device *xpc_part; 669extern struct device *xpc_chan; 670extern int xpc_disengage_request_timelimit; 671extern int xpc_disengage_request_timedout; 672extern irqreturn_t xpc_notify_IRQ_handler(int, void *); 673extern void xpc_dropped_IPI_check(struct xpc_partition *); 674extern void xpc_activate_partition(struct xpc_partition *); 675extern void xpc_activate_kthreads(struct xpc_channel *, int); 676extern void xpc_create_kthreads(struct xpc_channel *, int, int); 677extern void xpc_disconnect_wait(int); 678 679 680/* found in xpc_partition.c */ 681extern int xpc_exiting; 682extern struct xpc_vars *xpc_vars; 683extern struct xpc_rsvd_page *xpc_rsvd_page; 684extern struct xpc_vars_part *xpc_vars_part; 685extern struct xpc_partition xpc_partitions[XP_MAX_PARTITIONS + 1]; 686extern char *xpc_remote_copy_buffer; 687extern void *xpc_remote_copy_buffer_base; 688extern void *xpc_kmalloc_cacheline_aligned(size_t, gfp_t, void **); 689extern struct xpc_rsvd_page *xpc_rsvd_page_init(void); 690extern void xpc_allow_IPI_ops(void); 691extern void xpc_restrict_IPI_ops(void); 692extern int xpc_identify_act_IRQ_sender(void); 693extern int xpc_partition_disengaged(struct xpc_partition *); 694extern enum xpc_retval xpc_mark_partition_active(struct xpc_partition *); 695extern void xpc_mark_partition_inactive(struct xpc_partition *); 696extern void xpc_discovery(void); 697extern void xpc_check_remote_hb(void); 698extern void xpc_deactivate_partition(const int, struct xpc_partition *, 699 enum xpc_retval); 700extern enum xpc_retval xpc_initiate_partid_to_nasids(partid_t, void *); 701 702 703/* found in xpc_channel.c */ 704extern void xpc_initiate_connect(int); 705extern void xpc_initiate_disconnect(int); 706extern enum xpc_retval xpc_initiate_allocate(partid_t, int, u32, void **); 707extern enum xpc_retval xpc_initiate_send(partid_t, int, void *); 708extern enum xpc_retval xpc_initiate_send_notify(partid_t, int, void *, 709 xpc_notify_func, void *); 710extern void xpc_initiate_received(partid_t, int, void *); 711extern enum xpc_retval xpc_setup_infrastructure(struct xpc_partition *); 712extern enum xpc_retval xpc_pull_remote_vars_part(struct xpc_partition *); 713extern void xpc_process_channel_activity(struct xpc_partition *); 714extern void xpc_connected_callout(struct xpc_channel *); 715extern void xpc_deliver_msg(struct xpc_channel *); 716extern void xpc_disconnect_channel(const int, struct xpc_channel *, 717 enum xpc_retval, unsigned long *); 718extern void xpc_disconnect_callout(struct xpc_channel *, enum xpc_retval); 719extern void xpc_partition_going_down(struct xpc_partition *, enum xpc_retval); 720extern void xpc_teardown_infrastructure(struct xpc_partition *); 721 722 723 724static inline void 725xpc_wakeup_channel_mgr(struct xpc_partition *part) 726{ 727 if (atomic_inc_return(&part->channel_mgr_requests) == 1) { 728 wake_up(&part->channel_mgr_wq); 729 } 730} 731 732 733 734/* 735 * These next two inlines are used to keep us from tearing down a channel's 736 * msg queues while a thread may be referencing them. 737 */ 738static inline void 739xpc_msgqueue_ref(struct xpc_channel *ch) 740{ 741 atomic_inc(&ch->references); 742} 743 744static inline void 745xpc_msgqueue_deref(struct xpc_channel *ch) 746{ 747 s32 refs = atomic_dec_return(&ch->references); 748 749 DBUG_ON(refs < 0); 750 if (refs == 0) { 751 xpc_wakeup_channel_mgr(&xpc_partitions[ch->partid]); 752 } 753} 754 755 756 757#define XPC_DISCONNECT_CHANNEL(_ch, _reason, _irqflgs) \ 758 xpc_disconnect_channel(__LINE__, _ch, _reason, _irqflgs) 759 760 761/* 762 * These two inlines are used to keep us from tearing down a partition's 763 * setup infrastructure while a thread may be referencing it. 764 */ 765static inline void 766xpc_part_deref(struct xpc_partition *part) 767{ 768 s32 refs = atomic_dec_return(&part->references); 769 770 771 DBUG_ON(refs < 0); 772 if (refs == 0 && part->setup_state == XPC_P_WTEARDOWN) { 773 wake_up(&part->teardown_wq); 774 } 775} 776 777static inline int 778xpc_part_ref(struct xpc_partition *part) 779{ 780 int setup; 781 782 783 atomic_inc(&part->references); 784 setup = (part->setup_state == XPC_P_SETUP); 785 if (!setup) { 786 xpc_part_deref(part); 787 } 788 return setup; 789} 790 791 792 793/* 794 * The following macro is to be used for the setting of the reason and 795 * reason_line fields in both the struct xpc_channel and struct xpc_partition 796 * structures. 797 */ 798#define XPC_SET_REASON(_p, _reason, _line) \ 799 { \ 800 (_p)->reason = _reason; \ 801 (_p)->reason_line = _line; \ 802 } 803 804 805 806/* 807 * This next set of inlines are used to keep track of when a partition is 808 * potentially engaged in accessing memory belonging to another partition. 809 */ 810 811static inline void 812xpc_mark_partition_engaged(struct xpc_partition *part) 813{ 814 unsigned long irq_flags; 815 AMO_t *amo = (AMO_t *) __va(part->remote_amos_page_pa + 816 (XPC_ENGAGED_PARTITIONS_AMO * sizeof(AMO_t))); 817 818 819 local_irq_save(irq_flags); 820 821 /* set bit corresponding to our partid in remote partition's AMO */ 822 FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_OR, 823 (1UL << sn_partition_id)); 824 /* 825 * We must always use the nofault function regardless of whether we 826 * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we 827 * didn't, we'd never know that the other partition is down and would 828 * keep sending IPIs and AMOs to it until the heartbeat times out. 829 */ 830 (void) xp_nofault_PIOR((u64 *) GLOBAL_MMR_ADDR(NASID_GET(&amo-> 831 variable), xp_nofault_PIOR_target)); 832 833 local_irq_restore(irq_flags); 834} 835 836static inline void 837xpc_mark_partition_disengaged(struct xpc_partition *part) 838{ 839 unsigned long irq_flags; 840 AMO_t *amo = (AMO_t *) __va(part->remote_amos_page_pa + 841 (XPC_ENGAGED_PARTITIONS_AMO * sizeof(AMO_t))); 842 843 844 local_irq_save(irq_flags); 845 846 /* clear bit corresponding to our partid in remote partition's AMO */ 847 FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_AND, 848 ~(1UL << sn_partition_id)); 849 /* 850 * We must always use the nofault function regardless of whether we 851 * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we 852 * didn't, we'd never know that the other partition is down and would 853 * keep sending IPIs and AMOs to it until the heartbeat times out. 854 */ 855 (void) xp_nofault_PIOR((u64 *) GLOBAL_MMR_ADDR(NASID_GET(&amo-> 856 variable), xp_nofault_PIOR_target)); 857 858 local_irq_restore(irq_flags); 859} 860 861static inline void 862xpc_request_partition_disengage(struct xpc_partition *part) 863{ 864 unsigned long irq_flags; 865 AMO_t *amo = (AMO_t *) __va(part->remote_amos_page_pa + 866 (XPC_DISENGAGE_REQUEST_AMO * sizeof(AMO_t))); 867 868 869 local_irq_save(irq_flags); 870 871 /* set bit corresponding to our partid in remote partition's AMO */ 872 FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_OR, 873 (1UL << sn_partition_id)); 874 /* 875 * We must always use the nofault function regardless of whether we 876 * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we 877 * didn't, we'd never know that the other partition is down and would 878 * keep sending IPIs and AMOs to it until the heartbeat times out. 879 */ 880 (void) xp_nofault_PIOR((u64 *) GLOBAL_MMR_ADDR(NASID_GET(&amo-> 881 variable), xp_nofault_PIOR_target)); 882 883 local_irq_restore(irq_flags); 884} 885 886static inline void 887xpc_cancel_partition_disengage_request(struct xpc_partition *part) 888{ 889 unsigned long irq_flags; 890 AMO_t *amo = (AMO_t *) __va(part->remote_amos_page_pa + 891 (XPC_DISENGAGE_REQUEST_AMO * sizeof(AMO_t))); 892 893 894 local_irq_save(irq_flags); 895 896 /* clear bit corresponding to our partid in remote partition's AMO */ 897 FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_AND, 898 ~(1UL << sn_partition_id)); 899 /* 900 * We must always use the nofault function regardless of whether we 901 * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we 902 * didn't, we'd never know that the other partition is down and would 903 * keep sending IPIs and AMOs to it until the heartbeat times out. 904 */ 905 (void) xp_nofault_PIOR((u64 *) GLOBAL_MMR_ADDR(NASID_GET(&amo-> 906 variable), xp_nofault_PIOR_target)); 907 908 local_irq_restore(irq_flags); 909} 910 911static inline u64 912xpc_partition_engaged(u64 partid_mask) 913{ 914 AMO_t *amo = xpc_vars->amos_page + XPC_ENGAGED_PARTITIONS_AMO; 915 916 917 /* return our partition's AMO variable ANDed with partid_mask */ 918 return (FETCHOP_LOAD_OP(TO_AMO((u64) &amo->variable), FETCHOP_LOAD) & 919 partid_mask); 920} 921 922static inline u64 923xpc_partition_disengage_requested(u64 partid_mask) 924{ 925 AMO_t *amo = xpc_vars->amos_page + XPC_DISENGAGE_REQUEST_AMO; 926 927 928 /* return our partition's AMO variable ANDed with partid_mask */ 929 return (FETCHOP_LOAD_OP(TO_AMO((u64) &amo->variable), FETCHOP_LOAD) & 930 partid_mask); 931} 932 933static inline void 934xpc_clear_partition_engaged(u64 partid_mask) 935{ 936 AMO_t *amo = xpc_vars->amos_page + XPC_ENGAGED_PARTITIONS_AMO; 937 938 939 /* clear bit(s) based on partid_mask in our partition's AMO */ 940 FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_AND, 941 ~partid_mask); 942} 943 944static inline void 945xpc_clear_partition_disengage_request(u64 partid_mask) 946{ 947 AMO_t *amo = xpc_vars->amos_page + XPC_DISENGAGE_REQUEST_AMO; 948 949 950 /* clear bit(s) based on partid_mask in our partition's AMO */ 951 FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_AND, 952 ~partid_mask); 953} 954 955 956 957/* 958 * The following set of macros and inlines are used for the sending and 959 * receiving of IPIs (also known as IRQs). There are two flavors of IPIs, 960 * one that is associated with partition activity (SGI_XPC_ACTIVATE) and 961 * the other that is associated with channel activity (SGI_XPC_NOTIFY). 962 */ 963 964static inline u64 965xpc_IPI_receive(AMO_t *amo) 966{ 967 return FETCHOP_LOAD_OP(TO_AMO((u64) &amo->variable), FETCHOP_CLEAR); 968} 969 970 971static inline enum xpc_retval 972xpc_IPI_send(AMO_t *amo, u64 flag, int nasid, int phys_cpuid, int vector) 973{ 974 int ret = 0; 975 unsigned long irq_flags; 976 977 978 local_irq_save(irq_flags); 979 980 FETCHOP_STORE_OP(TO_AMO((u64) &amo->variable), FETCHOP_OR, flag); 981 sn_send_IPI_phys(nasid, phys_cpuid, vector, 0); 982 983 /* 984 * We must always use the nofault function regardless of whether we 985 * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we 986 * didn't, we'd never know that the other partition is down and would 987 * keep sending IPIs and AMOs to it until the heartbeat times out. 988 */ 989 ret = xp_nofault_PIOR((u64 *) GLOBAL_MMR_ADDR(NASID_GET(&amo->variable), 990 xp_nofault_PIOR_target)); 991 992 local_irq_restore(irq_flags); 993 994 return ((ret == 0) ? xpcSuccess : xpcPioReadError); 995} 996 997 998/* 999 * IPIs associated with SGI_XPC_ACTIVATE IRQ. 1000 */ 1001 1002/* 1003 * Flag the appropriate AMO variable and send an IPI to the specified node. 1004 */ 1005static inline void 1006xpc_activate_IRQ_send(u64 amos_page_pa, int from_nasid, int to_nasid, 1007 int to_phys_cpuid) 1008{ 1009 int w_index = XPC_NASID_W_INDEX(from_nasid); 1010 int b_index = XPC_NASID_B_INDEX(from_nasid); 1011 AMO_t *amos = (AMO_t *) __va(amos_page_pa + 1012 (XPC_ACTIVATE_IRQ_AMOS * sizeof(AMO_t))); 1013 1014 1015 (void) xpc_IPI_send(&amos[w_index], (1UL << b_index), to_nasid, 1016 to_phys_cpuid, SGI_XPC_ACTIVATE); 1017} 1018 1019static inline void 1020xpc_IPI_send_activate(struct xpc_vars *vars) 1021{ 1022 xpc_activate_IRQ_send(vars->amos_page_pa, cnodeid_to_nasid(0), 1023 vars->act_nasid, vars->act_phys_cpuid); 1024} 1025 1026static inline void 1027xpc_IPI_send_activated(struct xpc_partition *part) 1028{ 1029 xpc_activate_IRQ_send(part->remote_amos_page_pa, cnodeid_to_nasid(0), 1030 part->remote_act_nasid, part->remote_act_phys_cpuid); 1031} 1032 1033static inline void 1034xpc_IPI_send_reactivate(struct xpc_partition *part) 1035{ 1036 xpc_activate_IRQ_send(xpc_vars->amos_page_pa, part->reactivate_nasid, 1037 xpc_vars->act_nasid, xpc_vars->act_phys_cpuid); 1038} 1039 1040static inline void 1041xpc_IPI_send_disengage(struct xpc_partition *part) 1042{ 1043 xpc_activate_IRQ_send(part->remote_amos_page_pa, cnodeid_to_nasid(0), 1044 part->remote_act_nasid, part->remote_act_phys_cpuid); 1045} 1046 1047 1048/* 1049 * IPIs associated with SGI_XPC_NOTIFY IRQ. 1050 */ 1051 1052/* 1053 * Send an IPI to the remote partition that is associated with the 1054 * specified channel. 1055 */ 1056#define XPC_NOTIFY_IRQ_SEND(_ch, _ipi_f, _irq_f) \ 1057 xpc_notify_IRQ_send(_ch, _ipi_f, #_ipi_f, _irq_f) 1058 1059static inline void 1060xpc_notify_IRQ_send(struct xpc_channel *ch, u8 ipi_flag, char *ipi_flag_string, 1061 unsigned long *irq_flags) 1062{ 1063 struct xpc_partition *part = &xpc_partitions[ch->partid]; 1064 enum xpc_retval ret; 1065 1066 1067 if (likely(part->act_state != XPC_P_DEACTIVATING)) { 1068 ret = xpc_IPI_send(part->remote_IPI_amo_va, 1069 (u64) ipi_flag << (ch->number * 8), 1070 part->remote_IPI_nasid, 1071 part->remote_IPI_phys_cpuid, 1072 SGI_XPC_NOTIFY); 1073 dev_dbg(xpc_chan, "%s sent to partid=%d, channel=%d, ret=%d\n", 1074 ipi_flag_string, ch->partid, ch->number, ret); 1075 if (unlikely(ret != xpcSuccess)) { 1076 if (irq_flags != NULL) { 1077 spin_unlock_irqrestore(&ch->lock, *irq_flags); 1078 } 1079 XPC_DEACTIVATE_PARTITION(part, ret); 1080 if (irq_flags != NULL) { 1081 spin_lock_irqsave(&ch->lock, *irq_flags); 1082 } 1083 } 1084 } 1085} 1086 1087 1088/* 1089 * Make it look like the remote partition, which is associated with the 1090 * specified channel, sent us an IPI. This faked IPI will be handled 1091 * by xpc_dropped_IPI_check(). 1092 */ 1093#define XPC_NOTIFY_IRQ_SEND_LOCAL(_ch, _ipi_f) \ 1094 xpc_notify_IRQ_send_local(_ch, _ipi_f, #_ipi_f) 1095 1096static inline void 1097xpc_notify_IRQ_send_local(struct xpc_channel *ch, u8 ipi_flag, 1098 char *ipi_flag_string) 1099{ 1100 struct xpc_partition *part = &xpc_partitions[ch->partid]; 1101 1102 1103 FETCHOP_STORE_OP(TO_AMO((u64) &part->local_IPI_amo_va->variable), 1104 FETCHOP_OR, ((u64) ipi_flag << (ch->number * 8))); 1105 dev_dbg(xpc_chan, "%s sent local from partid=%d, channel=%d\n", 1106 ipi_flag_string, ch->partid, ch->number); 1107} 1108 1109 1110/* 1111 * The sending and receiving of IPIs includes the setting of an AMO variable 1112 * to indicate the reason the IPI was sent. The 64-bit variable is divided 1113 * up into eight bytes, ordered from right to left. Byte zero pertains to 1114 * channel 0, byte one to channel 1, and so on. Each byte is described by 1115 * the following IPI flags. 1116 */ 1117 1118#define XPC_IPI_CLOSEREQUEST 0x01 1119#define XPC_IPI_CLOSEREPLY 0x02 1120#define XPC_IPI_OPENREQUEST 0x04 1121#define XPC_IPI_OPENREPLY 0x08 1122#define XPC_IPI_MSGREQUEST 0x10 1123 1124 1125/* given an AMO variable and a channel#, get its associated IPI flags */ 1126#define XPC_GET_IPI_FLAGS(_amo, _c) ((u8) (((_amo) >> ((_c) * 8)) & 0xff)) 1127#define XPC_SET_IPI_FLAGS(_amo, _c, _f) (_amo) |= ((u64) (_f) << ((_c) * 8)) 1128 1129#define XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(_amo) ((_amo) & __IA64_UL_CONST(0x0f0f0f0f0f0f0f0f)) 1130#define XPC_ANY_MSG_IPI_FLAGS_SET(_amo) ((_amo) & __IA64_UL_CONST(0x1010101010101010)) 1131 1132 1133static inline void 1134xpc_IPI_send_closerequest(struct xpc_channel *ch, unsigned long *irq_flags) 1135{ 1136 struct xpc_openclose_args *args = ch->local_openclose_args; 1137 1138 1139 args->reason = ch->reason; 1140 1141 XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_CLOSEREQUEST, irq_flags); 1142} 1143 1144static inline void 1145xpc_IPI_send_closereply(struct xpc_channel *ch, unsigned long *irq_flags) 1146{ 1147 XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_CLOSEREPLY, irq_flags); 1148} 1149 1150static inline void 1151xpc_IPI_send_openrequest(struct xpc_channel *ch, unsigned long *irq_flags) 1152{ 1153 struct xpc_openclose_args *args = ch->local_openclose_args; 1154 1155 1156 args->msg_size = ch->msg_size; 1157 args->local_nentries = ch->local_nentries; 1158 1159 XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_OPENREQUEST, irq_flags); 1160} 1161 1162static inline void 1163xpc_IPI_send_openreply(struct xpc_channel *ch, unsigned long *irq_flags) 1164{ 1165 struct xpc_openclose_args *args = ch->local_openclose_args; 1166 1167 1168 args->remote_nentries = ch->remote_nentries; 1169 args->local_nentries = ch->local_nentries; 1170 args->local_msgqueue_pa = __pa(ch->local_msgqueue); 1171 1172 XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_OPENREPLY, irq_flags); 1173} 1174 1175static inline void 1176xpc_IPI_send_msgrequest(struct xpc_channel *ch) 1177{ 1178 XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_MSGREQUEST, NULL); 1179} 1180 1181static inline void 1182xpc_IPI_send_local_msgrequest(struct xpc_channel *ch) 1183{ 1184 XPC_NOTIFY_IRQ_SEND_LOCAL(ch, XPC_IPI_MSGREQUEST); 1185} 1186 1187 1188/* 1189 * Memory for XPC's AMO variables is allocated by the MSPEC driver. These 1190 * pages are located in the lowest granule. The lowest granule uses 4k pages 1191 * for cached references and an alternate TLB handler to never provide a 1192 * cacheable mapping for the entire region. This will prevent speculative 1193 * reading of cached copies of our lines from being issued which will cause 1194 * a PI FSB Protocol error to be generated by the SHUB. For XPC, we need 64 1195 * AMO variables (based on XP_MAX_PARTITIONS) for message notification and an 1196 * additional 128 AMO variables (based on XP_NASID_MASK_WORDS) for partition 1197 * activation and 2 AMO variables for partition deactivation. 1198 */ 1199static inline AMO_t * 1200xpc_IPI_init(int index) 1201{ 1202 AMO_t *amo = xpc_vars->amos_page + index; 1203 1204 1205 (void) xpc_IPI_receive(amo); /* clear AMO variable */ 1206 return amo; 1207} 1208 1209 1210 1211static inline enum xpc_retval 1212xpc_map_bte_errors(bte_result_t error) 1213{ 1214 switch (error) { 1215 case BTE_SUCCESS: return xpcSuccess; 1216 case BTEFAIL_DIR: return xpcBteDirectoryError; 1217 case BTEFAIL_POISON: return xpcBtePoisonError; 1218 case BTEFAIL_WERR: return xpcBteWriteError; 1219 case BTEFAIL_ACCESS: return xpcBteAccessError; 1220 case BTEFAIL_PWERR: return xpcBtePWriteError; 1221 case BTEFAIL_PRERR: return xpcBtePReadError; 1222 case BTEFAIL_TOUT: return xpcBteTimeOutError; 1223 case BTEFAIL_XTERR: return xpcBteXtalkError; 1224 case BTEFAIL_NOTAVAIL: return xpcBteNotAvailable; 1225 default: return xpcBteUnmappedError; 1226 } 1227} 1228 1229 1230 1231/* 1232 * Check to see if there is any channel activity to/from the specified 1233 * partition. 1234 */ 1235static inline void 1236xpc_check_for_channel_activity(struct xpc_partition *part) 1237{ 1238 u64 IPI_amo; 1239 unsigned long irq_flags; 1240 1241 1242 IPI_amo = xpc_IPI_receive(part->local_IPI_amo_va); 1243 if (IPI_amo == 0) { 1244 return; 1245 } 1246 1247 spin_lock_irqsave(&part->IPI_lock, irq_flags); 1248 part->local_IPI_amo |= IPI_amo; 1249 spin_unlock_irqrestore(&part->IPI_lock, irq_flags); 1250 1251 dev_dbg(xpc_chan, "received IPI from partid=%d, IPI_amo=0x%lx\n", 1252 XPC_PARTID(part), IPI_amo); 1253 1254 xpc_wakeup_channel_mgr(part); 1255} 1256 1257 1258#endif /* _ASM_IA64_SN_XPC_H */ 1259