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 * SGI UV Broadcast Assist Unit definitions 7 * 8 * Copyright (C) 2008 Silicon Graphics, Inc. All rights reserved. 9 */ 10 11#ifndef _ASM_X86_UV_UV_BAU_H 12#define _ASM_X86_UV_UV_BAU_H 13 14#include <linux/bitmap.h> 15#define BITSPERBYTE 8 16 17/* 18 * Broadcast Assist Unit messaging structures 19 * 20 * Selective Broadcast activations are induced by software action 21 * specifying a particular 8-descriptor "set" via a 6-bit index written 22 * to an MMR. 23 * Thus there are 64 unique 512-byte sets of SB descriptors - one set for 24 * each 6-bit index value. These descriptor sets are mapped in sequence 25 * starting with set 0 located at the address specified in the 26 * BAU_SB_DESCRIPTOR_BASE register, set 1 is located at BASE + 512, 27 * set 2 is at BASE + 2*512, set 3 at BASE + 3*512, and so on. 28 * 29 * We will use 31 sets, one for sending BAU messages from each of the 32 30 * cpu's on the uvhub. 31 * 32 * TLB shootdown will use the first of the 8 descriptors of each set. 33 * Each of the descriptors is 64 bytes in size (8*64 = 512 bytes in a set). 34 */ 35 36#define UV_ITEMS_PER_DESCRIPTOR 8 37/* the 'throttle' to prevent the hardware stay-busy bug */ 38#define MAX_BAU_CONCURRENT 3 39#define UV_CPUS_PER_ACT_STATUS 32 40#define UV_ACT_STATUS_MASK 0x3 41#define UV_ACT_STATUS_SIZE 2 42#define UV_ADP_SIZE 32 43#define UV_DISTRIBUTION_SIZE 256 44#define UV_SW_ACK_NPENDING 8 45#define UV_NET_ENDPOINT_INTD 0x38 46#define UV_DESC_BASE_PNODE_SHIFT 49 47#define UV_PAYLOADQ_PNODE_SHIFT 49 48#define UV_PTC_BASENAME "sgi_uv/ptc_statistics" 49#define UV_BAU_BASENAME "sgi_uv/bau_tunables" 50#define UV_BAU_TUNABLES_DIR "sgi_uv" 51#define UV_BAU_TUNABLES_FILE "bau_tunables" 52#define WHITESPACE " \t\n" 53#define uv_physnodeaddr(x) ((__pa((unsigned long)(x)) & uv_mmask)) 54#define UV_ENABLE_INTD_SOFT_ACK_MODE_SHIFT 15 55#define UV_INTD_SOFT_ACK_TIMEOUT_PERIOD_SHIFT 16 56#define UV_INTD_SOFT_ACK_TIMEOUT_PERIOD 0x0000000009UL 57/* [19:16] SOFT_ACK timeout period 19: 1 is urgency 7 17:16 1 is multiplier */ 58#define BAU_MISC_CONTROL_MULT_MASK 3 59 60#define UVH_AGING_PRESCALE_SEL 0x000000b000UL 61/* [30:28] URGENCY_7 an index into a table of times */ 62#define BAU_URGENCY_7_SHIFT 28 63#define BAU_URGENCY_7_MASK 7 64 65#define UVH_TRANSACTION_TIMEOUT 0x000000b200UL 66/* [45:40] BAU - BAU transaction timeout select - a multiplier */ 67#define BAU_TRANS_SHIFT 40 68#define BAU_TRANS_MASK 0x3f 69 70/* 71 * bits in UVH_LB_BAU_SB_ACTIVATION_STATUS_0/1 72 */ 73#define DESC_STATUS_IDLE 0 74#define DESC_STATUS_ACTIVE 1 75#define DESC_STATUS_DESTINATION_TIMEOUT 2 76#define DESC_STATUS_SOURCE_TIMEOUT 3 77 78/* 79 * delay for 'plugged' timeout retries, in microseconds 80 */ 81#define PLUGGED_DELAY 10 82 83/* 84 * threshholds at which to use IPI to free resources 85 */ 86/* after this # consecutive 'plugged' timeouts, use IPI to release resources */ 87#define PLUGSB4RESET 100 88/* after this many consecutive timeouts, use IPI to release resources */ 89#define TIMEOUTSB4RESET 1 90/* at this number uses of IPI to release resources, giveup the request */ 91#define IPI_RESET_LIMIT 1 92/* after this # consecutive successes, bump up the throttle if it was lowered */ 93#define COMPLETE_THRESHOLD 5 94 95/* 96 * number of entries in the destination side payload queue 97 */ 98#define DEST_Q_SIZE 20 99/* 100 * number of destination side software ack resources 101 */ 102#define DEST_NUM_RESOURCES 8 103#define MAX_CPUS_PER_NODE 32 104/* 105 * completion statuses for sending a TLB flush message 106 */ 107#define FLUSH_RETRY_PLUGGED 1 108#define FLUSH_RETRY_TIMEOUT 2 109#define FLUSH_GIVEUP 3 110#define FLUSH_COMPLETE 4 111 112/* 113 * tuning the action when the numalink network is extremely delayed 114 */ 115#define CONGESTED_RESPONSE_US 1000 /* 'long' response time, in microseconds */ 116#define CONGESTED_REPS 10 /* long delays averaged over this many broadcasts */ 117#define CONGESTED_PERIOD 30 /* time for the bau to be disabled, in seconds */ 118 119/* 120 * Distribution: 32 bytes (256 bits) (bytes 0-0x1f of descriptor) 121 * If the 'multilevel' flag in the header portion of the descriptor 122 * has been set to 0, then endpoint multi-unicast mode is selected. 123 * The distribution specification (32 bytes) is interpreted as a 256-bit 124 * distribution vector. Adjacent bits correspond to consecutive even numbered 125 * nodeIDs. The result of adding the index of a given bit to the 15-bit 126 * 'base_dest_nodeid' field of the header corresponds to the 127 * destination nodeID associated with that specified bit. 128 */ 129struct bau_target_uvhubmask { 130 unsigned long bits[BITS_TO_LONGS(UV_DISTRIBUTION_SIZE)]; 131}; 132 133/* 134 * mask of cpu's on a uvhub 135 * (during initialization we need to check that unsigned long has 136 * enough bits for max. cpu's per uvhub) 137 */ 138struct bau_local_cpumask { 139 unsigned long bits; 140}; 141 142/* 143 * Payload: 16 bytes (128 bits) (bytes 0x20-0x2f of descriptor) 144 * only 12 bytes (96 bits) of the payload area are usable. 145 * An additional 3 bytes (bits 27:4) of the header address are carried 146 * to the next bytes of the destination payload queue. 147 * And an additional 2 bytes of the header Suppl_A field are also 148 * carried to the destination payload queue. 149 * But the first byte of the Suppl_A becomes bits 127:120 (the 16th byte) 150 * of the destination payload queue, which is written by the hardware 151 * with the s/w ack resource bit vector. 152 * [ effective message contents (16 bytes (128 bits) maximum), not counting 153 * the s/w ack bit vector ] 154 */ 155 156/* 157 * The payload is software-defined for INTD transactions 158 */ 159struct bau_msg_payload { 160 unsigned long address; /* signifies a page or all TLB's 161 of the cpu */ 162 /* 64 bits */ 163 unsigned short sending_cpu; /* filled in by sender */ 164 /* 16 bits */ 165 unsigned short acknowledge_count;/* filled in by destination */ 166 /* 16 bits */ 167 unsigned int reserved1:32; /* not usable */ 168}; 169 170 171/* 172 * Message header: 16 bytes (128 bits) (bytes 0x30-0x3f of descriptor) 173 * see table 4.2.3.0.1 in broacast_assist spec. 174 */ 175struct bau_msg_header { 176 unsigned int dest_subnodeid:6; /* must be 0x10, for the LB */ 177 /* bits 5:0 */ 178 unsigned int base_dest_nodeid:15; /* nasid (pnode<<1) of */ 179 /* bits 20:6 */ /* first bit in uvhub map */ 180 unsigned int command:8; /* message type */ 181 /* bits 28:21 */ 182 /* 0x38: SN3net EndPoint Message */ 183 unsigned int rsvd_1:3; /* must be zero */ 184 /* bits 31:29 */ 185 /* int will align on 32 bits */ 186 unsigned int rsvd_2:9; /* must be zero */ 187 /* bits 40:32 */ 188 /* Suppl_A is 56-41 */ 189 unsigned int sequence:16;/* message sequence number */ 190 /* bits 56:41 */ /* becomes bytes 16-17 of msg */ 191 /* Address field (96:57) is never used as an 192 address (these are address bits 42:3) */ 193 194 unsigned int rsvd_3:1; /* must be zero */ 195 /* bit 57 */ 196 /* address bits 27:4 are payload */ 197 /* these next 24 (58-81) bits become bytes 12-14 of msg */ 198 199 /* bits 65:58 land in byte 12 */ 200 unsigned int replied_to:1;/* sent as 0 by the source to byte 12 */ 201 /* bit 58 */ 202 unsigned int msg_type:3; /* software type of the message*/ 203 /* bits 61:59 */ 204 unsigned int canceled:1; /* message canceled, resource to be freed*/ 205 /* bit 62 */ 206 unsigned int payload_1a:1;/* not currently used */ 207 /* bit 63 */ 208 unsigned int payload_1b:2;/* not currently used */ 209 /* bits 65:64 */ 210 211 /* bits 73:66 land in byte 13 */ 212 unsigned int payload_1ca:6;/* not currently used */ 213 /* bits 71:66 */ 214 unsigned int payload_1c:2;/* not currently used */ 215 /* bits 73:72 */ 216 217 /* bits 81:74 land in byte 14 */ 218 unsigned int payload_1d:6;/* not currently used */ 219 /* bits 79:74 */ 220 unsigned int payload_1e:2;/* not currently used */ 221 /* bits 81:80 */ 222 223 unsigned int rsvd_4:7; /* must be zero */ 224 /* bits 88:82 */ 225 unsigned int sw_ack_flag:1;/* software acknowledge flag */ 226 /* bit 89 */ 227 /* INTD trasactions at destination are to 228 wait for software acknowledge */ 229 unsigned int rsvd_5:6; /* must be zero */ 230 /* bits 95:90 */ 231 unsigned int rsvd_6:5; /* must be zero */ 232 /* bits 100:96 */ 233 unsigned int int_both:1;/* if 1, interrupt both sockets on the uvhub */ 234 /* bit 101*/ 235 unsigned int fairness:3;/* usually zero */ 236 /* bits 104:102 */ 237 unsigned int multilevel:1; /* multi-level multicast format */ 238 /* bit 105 */ 239 /* 0 for TLB: endpoint multi-unicast messages */ 240 unsigned int chaining:1;/* next descriptor is part of this activation*/ 241 /* bit 106 */ 242 unsigned int rsvd_7:21; /* must be zero */ 243 /* bits 127:107 */ 244}; 245 246/* see msg_type: */ 247#define MSG_NOOP 0 248#define MSG_REGULAR 1 249#define MSG_RETRY 2 250 251/* 252 * The activation descriptor: 253 * The format of the message to send, plus all accompanying control 254 * Should be 64 bytes 255 */ 256struct bau_desc { 257 struct bau_target_uvhubmask distribution; 258 /* 259 * message template, consisting of header and payload: 260 */ 261 struct bau_msg_header header; 262 struct bau_msg_payload payload; 263}; 264/* 265 * -payload-- ---------header------ 266 * bytes 0-11 bits 41-56 bits 58-81 267 * A B (2) C (3) 268 * 269 * A/B/C are moved to: 270 * A C B 271 * bytes 0-11 bytes 12-14 bytes 16-17 (byte 15 filled in by hw as vector) 272 * ------------payload queue----------- 273 */ 274 275/* 276 * The payload queue on the destination side is an array of these. 277 * With BAU_MISC_CONTROL set for software acknowledge mode, the messages 278 * are 32 bytes (2 micropackets) (256 bits) in length, but contain only 17 279 * bytes of usable data, including the sw ack vector in byte 15 (bits 127:120) 280 * (12 bytes come from bau_msg_payload, 3 from payload_1, 2 from 281 * sw_ack_vector and payload_2) 282 * "Enabling Software Acknowledgment mode (see Section 4.3.3 Software 283 * Acknowledge Processing) also selects 32 byte (17 bytes usable) payload 284 * operation." 285 */ 286struct bau_payload_queue_entry { 287 unsigned long address; /* signifies a page or all TLB's 288 of the cpu */ 289 /* 64 bits, bytes 0-7 */ 290 291 unsigned short sending_cpu; /* cpu that sent the message */ 292 /* 16 bits, bytes 8-9 */ 293 294 unsigned short acknowledge_count; /* filled in by destination */ 295 /* 16 bits, bytes 10-11 */ 296 297 /* these next 3 bytes come from bits 58-81 of the message header */ 298 unsigned short replied_to:1; /* sent as 0 by the source */ 299 unsigned short msg_type:3; /* software message type */ 300 unsigned short canceled:1; /* sent as 0 by the source */ 301 unsigned short unused1:3; /* not currently using */ 302 /* byte 12 */ 303 304 unsigned char unused2a; /* not currently using */ 305 /* byte 13 */ 306 unsigned char unused2; /* not currently using */ 307 /* byte 14 */ 308 309 unsigned char sw_ack_vector; /* filled in by the hardware */ 310 /* byte 15 (bits 127:120) */ 311 312 unsigned short sequence; /* message sequence number */ 313 /* bytes 16-17 */ 314 unsigned char unused4[2]; /* not currently using bytes 18-19 */ 315 /* bytes 18-19 */ 316 317 int number_of_cpus; /* filled in at destination */ 318 /* 32 bits, bytes 20-23 (aligned) */ 319 320 unsigned char unused5[8]; /* not using */ 321 /* bytes 24-31 */ 322}; 323 324struct msg_desc { 325 struct bau_payload_queue_entry *msg; 326 int msg_slot; 327 int sw_ack_slot; 328 struct bau_payload_queue_entry *va_queue_first; 329 struct bau_payload_queue_entry *va_queue_last; 330}; 331 332struct reset_args { 333 int sender; 334}; 335 336/* 337 * This structure is allocated per_cpu for UV TLB shootdown statistics. 338 */ 339struct ptc_stats { 340 /* sender statistics */ 341 unsigned long s_giveup; /* number of fall backs to IPI-style flushes */ 342 unsigned long s_requestor; /* number of shootdown requests */ 343 unsigned long s_stimeout; /* source side timeouts */ 344 unsigned long s_dtimeout; /* destination side timeouts */ 345 unsigned long s_time; /* time spent in sending side */ 346 unsigned long s_retriesok; /* successful retries */ 347 unsigned long s_ntargcpu; /* total number of cpu's targeted */ 348 unsigned long s_ntargself; /* times the sending cpu was targeted */ 349 unsigned long s_ntarglocals; /* targets of cpus on the local blade */ 350 unsigned long s_ntargremotes; /* targets of cpus on remote blades */ 351 unsigned long s_ntarglocaluvhub; /* targets of the local hub */ 352 unsigned long s_ntargremoteuvhub; /* remotes hubs targeted */ 353 unsigned long s_ntarguvhub; /* total number of uvhubs targeted */ 354 unsigned long s_ntarguvhub16; /* number of times target hubs >= 16*/ 355 unsigned long s_ntarguvhub8; /* number of times target hubs >= 8 */ 356 unsigned long s_ntarguvhub4; /* number of times target hubs >= 4 */ 357 unsigned long s_ntarguvhub2; /* number of times target hubs >= 2 */ 358 unsigned long s_ntarguvhub1; /* number of times target hubs == 1 */ 359 unsigned long s_resets_plug; /* ipi-style resets from plug state */ 360 unsigned long s_resets_timeout; /* ipi-style resets from timeouts */ 361 unsigned long s_busy; /* status stayed busy past s/w timer */ 362 unsigned long s_throttles; /* waits in throttle */ 363 unsigned long s_retry_messages; /* retry broadcasts */ 364 unsigned long s_bau_reenabled; /* for bau enable/disable */ 365 unsigned long s_bau_disabled; /* for bau enable/disable */ 366 /* destination statistics */ 367 unsigned long d_alltlb; /* times all tlb's on this cpu were flushed */ 368 unsigned long d_onetlb; /* times just one tlb on this cpu was flushed */ 369 unsigned long d_multmsg; /* interrupts with multiple messages */ 370 unsigned long d_nomsg; /* interrupts with no message */ 371 unsigned long d_time; /* time spent on destination side */ 372 unsigned long d_requestee; /* number of messages processed */ 373 unsigned long d_retries; /* number of retry messages processed */ 374 unsigned long d_canceled; /* number of messages canceled by retries */ 375 unsigned long d_nocanceled; /* retries that found nothing to cancel */ 376 unsigned long d_resets; /* number of ipi-style requests processed */ 377 unsigned long d_rcanceled; /* number of messages canceled by resets */ 378}; 379 380/* 381 * one per-cpu; to locate the software tables 382 */ 383struct bau_control { 384 struct bau_desc *descriptor_base; 385 struct bau_payload_queue_entry *va_queue_first; 386 struct bau_payload_queue_entry *va_queue_last; 387 struct bau_payload_queue_entry *bau_msg_head; 388 struct bau_control *uvhub_master; 389 struct bau_control *socket_master; 390 struct ptc_stats *statp; 391 unsigned long timeout_interval; 392 unsigned long set_bau_on_time; 393 atomic_t active_descriptor_count; 394 int plugged_tries; 395 int timeout_tries; 396 int ipi_attempts; 397 int conseccompletes; 398 int baudisabled; 399 int set_bau_off; 400 short cpu; 401 short uvhub_cpu; 402 short uvhub; 403 short cpus_in_socket; 404 short cpus_in_uvhub; 405 unsigned short message_number; 406 unsigned short uvhub_quiesce; 407 short socket_acknowledge_count[DEST_Q_SIZE]; 408 cycles_t send_message; 409 spinlock_t uvhub_lock; 410 spinlock_t queue_lock; 411 /* tunables */ 412 int max_bau_concurrent; 413 int max_bau_concurrent_constant; 414 int plugged_delay; 415 int plugsb4reset; 416 int timeoutsb4reset; 417 int ipi_reset_limit; 418 int complete_threshold; 419 int congested_response_us; 420 int congested_reps; 421 int congested_period; 422 cycles_t period_time; 423 long period_requests; 424}; 425 426static inline int bau_uvhub_isset(int uvhub, struct bau_target_uvhubmask *dstp) 427{ 428 return constant_test_bit(uvhub, &dstp->bits[0]); 429} 430static inline void bau_uvhub_set(int uvhub, struct bau_target_uvhubmask *dstp) 431{ 432 __set_bit(uvhub, &dstp->bits[0]); 433} 434static inline void bau_uvhubs_clear(struct bau_target_uvhubmask *dstp, 435 int nbits) 436{ 437 bitmap_zero(&dstp->bits[0], nbits); 438} 439static inline int bau_uvhub_weight(struct bau_target_uvhubmask *dstp) 440{ 441 return bitmap_weight((unsigned long *)&dstp->bits[0], 442 UV_DISTRIBUTION_SIZE); 443} 444 445static inline void bau_cpubits_clear(struct bau_local_cpumask *dstp, int nbits) 446{ 447 bitmap_zero(&dstp->bits, nbits); 448} 449 450#define cpubit_isset(cpu, bau_local_cpumask) \ 451 test_bit((cpu), (bau_local_cpumask).bits) 452 453extern void uv_bau_message_intr1(void); 454extern void uv_bau_timeout_intr1(void); 455 456struct atomic_short { 457 short counter; 458}; 459 460/** 461 * atomic_read_short - read a short atomic variable 462 * @v: pointer of type atomic_short 463 * 464 * Atomically reads the value of @v. 465 */ 466static inline int atomic_read_short(const struct atomic_short *v) 467{ 468 return v->counter; 469} 470 471/** 472 * atomic_add_short_return - add and return a short int 473 * @i: short value to add 474 * @v: pointer of type atomic_short 475 * 476 * Atomically adds @i to @v and returns @i + @v 477 */ 478static inline int atomic_add_short_return(short i, struct atomic_short *v) 479{ 480 short __i = i; 481 asm volatile(LOCK_PREFIX "xaddw %0, %1" 482 : "+r" (i), "+m" (v->counter) 483 : : "memory"); 484 return i + __i; 485} 486 487#endif /* _ASM_X86_UV_UV_BAU_H */ 488