1/* 2 * SGI UltraViolet TLB flush routines. 3 * 4 * (c) 2008-2010 Cliff Wickman <cpw@sgi.com>, SGI. 5 * 6 * This code is released under the GNU General Public License version 2 or 7 * later. 8 */ 9#include <linux/seq_file.h> 10#include <linux/proc_fs.h> 11#include <linux/debugfs.h> 12#include <linux/kernel.h> 13#include <linux/slab.h> 14 15#include <asm/mmu_context.h> 16#include <asm/uv/uv.h> 17#include <asm/uv/uv_mmrs.h> 18#include <asm/uv/uv_hub.h> 19#include <asm/uv/uv_bau.h> 20#include <asm/apic.h> 21#include <asm/idle.h> 22#include <asm/tsc.h> 23#include <asm/irq_vectors.h> 24#include <asm/timer.h> 25 26/* timeouts in nanoseconds (indexed by UVH_AGING_PRESCALE_SEL urgency7 30:28) */ 27static int timeout_base_ns[] = { 28 20, 29 160, 30 1280, 31 10240, 32 81920, 33 655360, 34 5242880, 35 167772160 36}; 37static int timeout_us; 38static int nobau; 39static int baudisabled; 40static spinlock_t disable_lock; 41static cycles_t congested_cycles; 42 43/* tunables: */ 44static int max_bau_concurrent = MAX_BAU_CONCURRENT; 45static int max_bau_concurrent_constant = MAX_BAU_CONCURRENT; 46static int plugged_delay = PLUGGED_DELAY; 47static int plugsb4reset = PLUGSB4RESET; 48static int timeoutsb4reset = TIMEOUTSB4RESET; 49static int ipi_reset_limit = IPI_RESET_LIMIT; 50static int complete_threshold = COMPLETE_THRESHOLD; 51static int congested_response_us = CONGESTED_RESPONSE_US; 52static int congested_reps = CONGESTED_REPS; 53static int congested_period = CONGESTED_PERIOD; 54static struct dentry *tunables_dir; 55static struct dentry *tunables_file; 56 57static int __init setup_nobau(char *arg) 58{ 59 nobau = 1; 60 return 0; 61} 62early_param("nobau", setup_nobau); 63 64/* base pnode in this partition */ 65static int uv_partition_base_pnode __read_mostly; 66/* position of pnode (which is nasid>>1): */ 67static int uv_nshift __read_mostly; 68static unsigned long uv_mmask __read_mostly; 69 70static DEFINE_PER_CPU(struct ptc_stats, ptcstats); 71static DEFINE_PER_CPU(struct bau_control, bau_control); 72static DEFINE_PER_CPU(cpumask_var_t, uv_flush_tlb_mask); 73 74/* 75 * Determine the first node on a uvhub. 'Nodes' are used for kernel 76 * memory allocation. 77 */ 78static int __init uvhub_to_first_node(int uvhub) 79{ 80 int node, b; 81 82 for_each_online_node(node) { 83 b = uv_node_to_blade_id(node); 84 if (uvhub == b) 85 return node; 86 } 87 return -1; 88} 89 90/* 91 * Determine the apicid of the first cpu on a uvhub. 92 */ 93static int __init uvhub_to_first_apicid(int uvhub) 94{ 95 int cpu; 96 97 for_each_present_cpu(cpu) 98 if (uvhub == uv_cpu_to_blade_id(cpu)) 99 return per_cpu(x86_cpu_to_apicid, cpu); 100 return -1; 101} 102 103/* 104 * Free a software acknowledge hardware resource by clearing its Pending 105 * bit. This will return a reply to the sender. 106 * If the message has timed out, a reply has already been sent by the 107 * hardware but the resource has not been released. In that case our 108 * clear of the Timeout bit (as well) will free the resource. No reply will 109 * be sent (the hardware will only do one reply per message). 110 */ 111static inline void uv_reply_to_message(struct msg_desc *mdp, 112 struct bau_control *bcp) 113{ 114 unsigned long dw; 115 struct bau_payload_queue_entry *msg; 116 117 msg = mdp->msg; 118 if (!msg->canceled) { 119 dw = (msg->sw_ack_vector << UV_SW_ACK_NPENDING) | 120 msg->sw_ack_vector; 121 uv_write_local_mmr( 122 UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS, dw); 123 } 124 msg->replied_to = 1; 125 msg->sw_ack_vector = 0; 126} 127 128/* 129 * Process the receipt of a RETRY message 130 */ 131static inline void uv_bau_process_retry_msg(struct msg_desc *mdp, 132 struct bau_control *bcp) 133{ 134 int i; 135 int cancel_count = 0; 136 int slot2; 137 unsigned long msg_res; 138 unsigned long mmr = 0; 139 struct bau_payload_queue_entry *msg; 140 struct bau_payload_queue_entry *msg2; 141 struct ptc_stats *stat; 142 143 msg = mdp->msg; 144 stat = bcp->statp; 145 stat->d_retries++; 146 /* 147 * cancel any message from msg+1 to the retry itself 148 */ 149 for (msg2 = msg+1, i = 0; i < DEST_Q_SIZE; msg2++, i++) { 150 if (msg2 > mdp->va_queue_last) 151 msg2 = mdp->va_queue_first; 152 if (msg2 == msg) 153 break; 154 155 /* same conditions for cancellation as uv_do_reset */ 156 if ((msg2->replied_to == 0) && (msg2->canceled == 0) && 157 (msg2->sw_ack_vector) && ((msg2->sw_ack_vector & 158 msg->sw_ack_vector) == 0) && 159 (msg2->sending_cpu == msg->sending_cpu) && 160 (msg2->msg_type != MSG_NOOP)) { 161 slot2 = msg2 - mdp->va_queue_first; 162 mmr = uv_read_local_mmr 163 (UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE); 164 msg_res = msg2->sw_ack_vector; 165 /* 166 * This is a message retry; clear the resources held 167 * by the previous message only if they timed out. 168 * If it has not timed out we have an unexpected 169 * situation to report. 170 */ 171 if (mmr & (msg_res << UV_SW_ACK_NPENDING)) { 172 /* 173 * is the resource timed out? 174 * make everyone ignore the cancelled message. 175 */ 176 msg2->canceled = 1; 177 stat->d_canceled++; 178 cancel_count++; 179 uv_write_local_mmr( 180 UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS, 181 (msg_res << UV_SW_ACK_NPENDING) | 182 msg_res); 183 } 184 } 185 } 186 if (!cancel_count) 187 stat->d_nocanceled++; 188} 189 190/* 191 * Do all the things a cpu should do for a TLB shootdown message. 192 * Other cpu's may come here at the same time for this message. 193 */ 194static void uv_bau_process_message(struct msg_desc *mdp, 195 struct bau_control *bcp) 196{ 197 int msg_ack_count; 198 short socket_ack_count = 0; 199 struct ptc_stats *stat; 200 struct bau_payload_queue_entry *msg; 201 struct bau_control *smaster = bcp->socket_master; 202 203 /* 204 * This must be a normal message, or retry of a normal message 205 */ 206 msg = mdp->msg; 207 stat = bcp->statp; 208 if (msg->address == TLB_FLUSH_ALL) { 209 local_flush_tlb(); 210 stat->d_alltlb++; 211 } else { 212 __flush_tlb_one(msg->address); 213 stat->d_onetlb++; 214 } 215 stat->d_requestee++; 216 217 /* 218 * One cpu on each uvhub has the additional job on a RETRY 219 * of releasing the resource held by the message that is 220 * being retried. That message is identified by sending 221 * cpu number. 222 */ 223 if (msg->msg_type == MSG_RETRY && bcp == bcp->uvhub_master) 224 uv_bau_process_retry_msg(mdp, bcp); 225 226 /* 227 * This is a sw_ack message, so we have to reply to it. 228 * Count each responding cpu on the socket. This avoids 229 * pinging the count's cache line back and forth between 230 * the sockets. 231 */ 232 socket_ack_count = atomic_add_short_return(1, (struct atomic_short *) 233 &smaster->socket_acknowledge_count[mdp->msg_slot]); 234 if (socket_ack_count == bcp->cpus_in_socket) { 235 /* 236 * Both sockets dump their completed count total into 237 * the message's count. 238 */ 239 smaster->socket_acknowledge_count[mdp->msg_slot] = 0; 240 msg_ack_count = atomic_add_short_return(socket_ack_count, 241 (struct atomic_short *)&msg->acknowledge_count); 242 243 if (msg_ack_count == bcp->cpus_in_uvhub) { 244 /* 245 * All cpus in uvhub saw it; reply 246 */ 247 uv_reply_to_message(mdp, bcp); 248 } 249 } 250 251 return; 252} 253 254/* 255 * Determine the first cpu on a uvhub. 256 */ 257static int uvhub_to_first_cpu(int uvhub) 258{ 259 int cpu; 260 for_each_present_cpu(cpu) 261 if (uvhub == uv_cpu_to_blade_id(cpu)) 262 return cpu; 263 return -1; 264} 265 266/* 267 * Last resort when we get a large number of destination timeouts is 268 * to clear resources held by a given cpu. 269 * Do this with IPI so that all messages in the BAU message queue 270 * can be identified by their nonzero sw_ack_vector field. 271 * 272 * This is entered for a single cpu on the uvhub. 273 * The sender want's this uvhub to free a specific message's 274 * sw_ack resources. 275 */ 276static void 277uv_do_reset(void *ptr) 278{ 279 int i; 280 int slot; 281 int count = 0; 282 unsigned long mmr; 283 unsigned long msg_res; 284 struct bau_control *bcp; 285 struct reset_args *rap; 286 struct bau_payload_queue_entry *msg; 287 struct ptc_stats *stat; 288 289 bcp = &per_cpu(bau_control, smp_processor_id()); 290 rap = (struct reset_args *)ptr; 291 stat = bcp->statp; 292 stat->d_resets++; 293 294 /* 295 * We're looking for the given sender, and 296 * will free its sw_ack resource. 297 * If all cpu's finally responded after the timeout, its 298 * message 'replied_to' was set. 299 */ 300 for (msg = bcp->va_queue_first, i = 0; i < DEST_Q_SIZE; msg++, i++) { 301 /* uv_do_reset: same conditions for cancellation as 302 uv_bau_process_retry_msg() */ 303 if ((msg->replied_to == 0) && 304 (msg->canceled == 0) && 305 (msg->sending_cpu == rap->sender) && 306 (msg->sw_ack_vector) && 307 (msg->msg_type != MSG_NOOP)) { 308 /* 309 * make everyone else ignore this message 310 */ 311 msg->canceled = 1; 312 slot = msg - bcp->va_queue_first; 313 count++; 314 /* 315 * only reset the resource if it is still pending 316 */ 317 mmr = uv_read_local_mmr 318 (UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE); 319 msg_res = msg->sw_ack_vector; 320 if (mmr & msg_res) { 321 stat->d_rcanceled++; 322 uv_write_local_mmr( 323 UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS, 324 (msg_res << UV_SW_ACK_NPENDING) | 325 msg_res); 326 } 327 } 328 } 329 return; 330} 331 332/* 333 * Use IPI to get all target uvhubs to release resources held by 334 * a given sending cpu number. 335 */ 336static void uv_reset_with_ipi(struct bau_target_uvhubmask *distribution, 337 int sender) 338{ 339 int uvhub; 340 int cpu; 341 cpumask_t mask; 342 struct reset_args reset_args; 343 344 reset_args.sender = sender; 345 346 cpus_clear(mask); 347 /* find a single cpu for each uvhub in this distribution mask */ 348 for (uvhub = 0; 349 uvhub < sizeof(struct bau_target_uvhubmask) * BITSPERBYTE; 350 uvhub++) { 351 if (!bau_uvhub_isset(uvhub, distribution)) 352 continue; 353 /* find a cpu for this uvhub */ 354 cpu = uvhub_to_first_cpu(uvhub); 355 cpu_set(cpu, mask); 356 } 357 /* IPI all cpus; Preemption is already disabled */ 358 smp_call_function_many(&mask, uv_do_reset, (void *)&reset_args, 1); 359 return; 360} 361 362static inline unsigned long 363cycles_2_us(unsigned long long cyc) 364{ 365 unsigned long long ns; 366 unsigned long us; 367 ns = (cyc * per_cpu(cyc2ns, smp_processor_id())) 368 >> CYC2NS_SCALE_FACTOR; 369 us = ns / 1000; 370 return us; 371} 372 373/* 374 * wait for all cpus on this hub to finish their sends and go quiet 375 * leaves uvhub_quiesce set so that no new broadcasts are started by 376 * bau_flush_send_and_wait() 377 */ 378static inline void 379quiesce_local_uvhub(struct bau_control *hmaster) 380{ 381 atomic_add_short_return(1, (struct atomic_short *) 382 &hmaster->uvhub_quiesce); 383} 384 385/* 386 * mark this quiet-requestor as done 387 */ 388static inline void 389end_uvhub_quiesce(struct bau_control *hmaster) 390{ 391 atomic_add_short_return(-1, (struct atomic_short *) 392 &hmaster->uvhub_quiesce); 393} 394 395/* 396 * Wait for completion of a broadcast software ack message 397 * return COMPLETE, RETRY(PLUGGED or TIMEOUT) or GIVEUP 398 */ 399static int uv_wait_completion(struct bau_desc *bau_desc, 400 unsigned long mmr_offset, int right_shift, int this_cpu, 401 struct bau_control *bcp, struct bau_control *smaster, long try) 402{ 403 unsigned long descriptor_status; 404 cycles_t ttime; 405 struct ptc_stats *stat = bcp->statp; 406 struct bau_control *hmaster; 407 408 hmaster = bcp->uvhub_master; 409 410 /* spin on the status MMR, waiting for it to go idle */ 411 while ((descriptor_status = (((unsigned long) 412 uv_read_local_mmr(mmr_offset) >> 413 right_shift) & UV_ACT_STATUS_MASK)) != 414 DESC_STATUS_IDLE) { 415 /* 416 * Our software ack messages may be blocked because there are 417 * no swack resources available. As long as none of them 418 * has timed out hardware will NACK our message and its 419 * state will stay IDLE. 420 */ 421 if (descriptor_status == DESC_STATUS_SOURCE_TIMEOUT) { 422 stat->s_stimeout++; 423 return FLUSH_GIVEUP; 424 } else if (descriptor_status == 425 DESC_STATUS_DESTINATION_TIMEOUT) { 426 stat->s_dtimeout++; 427 ttime = get_cycles(); 428 429 /* 430 * Our retries may be blocked by all destination 431 * swack resources being consumed, and a timeout 432 * pending. In that case hardware returns the 433 * ERROR that looks like a destination timeout. 434 */ 435 if (cycles_2_us(ttime - bcp->send_message) < 436 timeout_us) { 437 bcp->conseccompletes = 0; 438 return FLUSH_RETRY_PLUGGED; 439 } 440 441 bcp->conseccompletes = 0; 442 return FLUSH_RETRY_TIMEOUT; 443 } else { 444 /* 445 * descriptor_status is still BUSY 446 */ 447 cpu_relax(); 448 } 449 } 450 bcp->conseccompletes++; 451 return FLUSH_COMPLETE; 452} 453 454static inline cycles_t 455sec_2_cycles(unsigned long sec) 456{ 457 unsigned long ns; 458 cycles_t cyc; 459 460 ns = sec * 1000000000; 461 cyc = (ns << CYC2NS_SCALE_FACTOR)/(per_cpu(cyc2ns, smp_processor_id())); 462 return cyc; 463} 464 465/* 466 * conditionally add 1 to *v, unless *v is >= u 467 * return 0 if we cannot add 1 to *v because it is >= u 468 * return 1 if we can add 1 to *v because it is < u 469 * the add is atomic 470 * 471 * This is close to atomic_add_unless(), but this allows the 'u' value 472 * to be lowered below the current 'v'. atomic_add_unless can only stop 473 * on equal. 474 */ 475static inline int atomic_inc_unless_ge(spinlock_t *lock, atomic_t *v, int u) 476{ 477 spin_lock(lock); 478 if (atomic_read(v) >= u) { 479 spin_unlock(lock); 480 return 0; 481 } 482 atomic_inc(v); 483 spin_unlock(lock); 484 return 1; 485} 486 487/* 488 * Our retries are blocked by all destination swack resources being 489 * in use, and a timeout is pending. In that case hardware immediately 490 * returns the ERROR that looks like a destination timeout. 491 */ 492static void 493destination_plugged(struct bau_desc *bau_desc, struct bau_control *bcp, 494 struct bau_control *hmaster, struct ptc_stats *stat) 495{ 496 udelay(bcp->plugged_delay); 497 bcp->plugged_tries++; 498 if (bcp->plugged_tries >= bcp->plugsb4reset) { 499 bcp->plugged_tries = 0; 500 quiesce_local_uvhub(hmaster); 501 spin_lock(&hmaster->queue_lock); 502 uv_reset_with_ipi(&bau_desc->distribution, bcp->cpu); 503 spin_unlock(&hmaster->queue_lock); 504 end_uvhub_quiesce(hmaster); 505 bcp->ipi_attempts++; 506 stat->s_resets_plug++; 507 } 508} 509 510static void 511destination_timeout(struct bau_desc *bau_desc, struct bau_control *bcp, 512 struct bau_control *hmaster, struct ptc_stats *stat) 513{ 514 hmaster->max_bau_concurrent = 1; 515 bcp->timeout_tries++; 516 if (bcp->timeout_tries >= bcp->timeoutsb4reset) { 517 bcp->timeout_tries = 0; 518 quiesce_local_uvhub(hmaster); 519 spin_lock(&hmaster->queue_lock); 520 uv_reset_with_ipi(&bau_desc->distribution, bcp->cpu); 521 spin_unlock(&hmaster->queue_lock); 522 end_uvhub_quiesce(hmaster); 523 bcp->ipi_attempts++; 524 stat->s_resets_timeout++; 525 } 526} 527 528/* 529 * Completions are taking a very long time due to a congested numalink 530 * network. 531 */ 532static void 533disable_for_congestion(struct bau_control *bcp, struct ptc_stats *stat) 534{ 535 int tcpu; 536 struct bau_control *tbcp; 537 538 /* let only one cpu do this disabling */ 539 spin_lock(&disable_lock); 540 if (!baudisabled && bcp->period_requests && 541 ((bcp->period_time / bcp->period_requests) > congested_cycles)) { 542 /* it becomes this cpu's job to turn on the use of the 543 BAU again */ 544 baudisabled = 1; 545 bcp->set_bau_off = 1; 546 bcp->set_bau_on_time = get_cycles() + 547 sec_2_cycles(bcp->congested_period); 548 stat->s_bau_disabled++; 549 for_each_present_cpu(tcpu) { 550 tbcp = &per_cpu(bau_control, tcpu); 551 tbcp->baudisabled = 1; 552 } 553 } 554 spin_unlock(&disable_lock); 555} 556 557/** 558 * uv_flush_send_and_wait 559 * 560 * Send a broadcast and wait for it to complete. 561 * 562 * The flush_mask contains the cpus the broadcast is to be sent to including 563 * cpus that are on the local uvhub. 564 * 565 * Returns 0 if all flushing represented in the mask was done. 566 * Returns 1 if it gives up entirely and the original cpu mask is to be 567 * returned to the kernel. 568 */ 569int uv_flush_send_and_wait(struct bau_desc *bau_desc, 570 struct cpumask *flush_mask, struct bau_control *bcp) 571{ 572 int right_shift; 573 int completion_status = 0; 574 int seq_number = 0; 575 long try = 0; 576 int cpu = bcp->uvhub_cpu; 577 int this_cpu = bcp->cpu; 578 unsigned long mmr_offset; 579 unsigned long index; 580 cycles_t time1; 581 cycles_t time2; 582 cycles_t elapsed; 583 struct ptc_stats *stat = bcp->statp; 584 struct bau_control *smaster = bcp->socket_master; 585 struct bau_control *hmaster = bcp->uvhub_master; 586 587 if (!atomic_inc_unless_ge(&hmaster->uvhub_lock, 588 &hmaster->active_descriptor_count, 589 hmaster->max_bau_concurrent)) { 590 stat->s_throttles++; 591 do { 592 cpu_relax(); 593 } while (!atomic_inc_unless_ge(&hmaster->uvhub_lock, 594 &hmaster->active_descriptor_count, 595 hmaster->max_bau_concurrent)); 596 } 597 while (hmaster->uvhub_quiesce) 598 cpu_relax(); 599 600 if (cpu < UV_CPUS_PER_ACT_STATUS) { 601 mmr_offset = UVH_LB_BAU_SB_ACTIVATION_STATUS_0; 602 right_shift = cpu * UV_ACT_STATUS_SIZE; 603 } else { 604 mmr_offset = UVH_LB_BAU_SB_ACTIVATION_STATUS_1; 605 right_shift = 606 ((cpu - UV_CPUS_PER_ACT_STATUS) * UV_ACT_STATUS_SIZE); 607 } 608 time1 = get_cycles(); 609 do { 610 if (try == 0) { 611 bau_desc->header.msg_type = MSG_REGULAR; 612 seq_number = bcp->message_number++; 613 } else { 614 bau_desc->header.msg_type = MSG_RETRY; 615 stat->s_retry_messages++; 616 } 617 bau_desc->header.sequence = seq_number; 618 index = (1UL << UVH_LB_BAU_SB_ACTIVATION_CONTROL_PUSH_SHFT) | 619 bcp->uvhub_cpu; 620 bcp->send_message = get_cycles(); 621 uv_write_local_mmr(UVH_LB_BAU_SB_ACTIVATION_CONTROL, index); 622 try++; 623 completion_status = uv_wait_completion(bau_desc, mmr_offset, 624 right_shift, this_cpu, bcp, smaster, try); 625 626 if (completion_status == FLUSH_RETRY_PLUGGED) { 627 destination_plugged(bau_desc, bcp, hmaster, stat); 628 } else if (completion_status == FLUSH_RETRY_TIMEOUT) { 629 destination_timeout(bau_desc, bcp, hmaster, stat); 630 } 631 if (bcp->ipi_attempts >= bcp->ipi_reset_limit) { 632 bcp->ipi_attempts = 0; 633 completion_status = FLUSH_GIVEUP; 634 break; 635 } 636 cpu_relax(); 637 } while ((completion_status == FLUSH_RETRY_PLUGGED) || 638 (completion_status == FLUSH_RETRY_TIMEOUT)); 639 time2 = get_cycles(); 640 bcp->plugged_tries = 0; 641 bcp->timeout_tries = 0; 642 if ((completion_status == FLUSH_COMPLETE) && 643 (bcp->conseccompletes > bcp->complete_threshold) && 644 (hmaster->max_bau_concurrent < 645 hmaster->max_bau_concurrent_constant)) 646 hmaster->max_bau_concurrent++; 647 while (hmaster->uvhub_quiesce) 648 cpu_relax(); 649 atomic_dec(&hmaster->active_descriptor_count); 650 if (time2 > time1) { 651 elapsed = time2 - time1; 652 stat->s_time += elapsed; 653 if ((completion_status == FLUSH_COMPLETE) && (try == 1)) { 654 bcp->period_requests++; 655 bcp->period_time += elapsed; 656 if ((elapsed > congested_cycles) && 657 (bcp->period_requests > bcp->congested_reps)) { 658 disable_for_congestion(bcp, stat); 659 } 660 } 661 } else 662 stat->s_requestor--; 663 if (completion_status == FLUSH_COMPLETE && try > 1) 664 stat->s_retriesok++; 665 else if (completion_status == FLUSH_GIVEUP) { 666 stat->s_giveup++; 667 return 1; 668 } 669 return 0; 670} 671 672/** 673 * uv_flush_tlb_others - globally purge translation cache of a virtual 674 * address or all TLB's 675 * @cpumask: mask of all cpu's in which the address is to be removed 676 * @mm: mm_struct containing virtual address range 677 * @va: virtual address to be removed (or TLB_FLUSH_ALL for all TLB's on cpu) 678 * @cpu: the current cpu 679 * 680 * This is the entry point for initiating any UV global TLB shootdown. 681 * 682 * Purges the translation caches of all specified processors of the given 683 * virtual address, or purges all TLB's on specified processors. 684 * 685 * The caller has derived the cpumask from the mm_struct. This function 686 * is called only if there are bits set in the mask. (e.g. flush_tlb_page()) 687 * 688 * The cpumask is converted into a uvhubmask of the uvhubs containing 689 * those cpus. 690 * 691 * Note that this function should be called with preemption disabled. 692 * 693 * Returns NULL if all remote flushing was done. 694 * Returns pointer to cpumask if some remote flushing remains to be 695 * done. The returned pointer is valid till preemption is re-enabled. 696 */ 697const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask, 698 struct mm_struct *mm, 699 unsigned long va, unsigned int cpu) 700{ 701 int tcpu; 702 int uvhub; 703 int locals = 0; 704 int remotes = 0; 705 int hubs = 0; 706 struct bau_desc *bau_desc; 707 struct cpumask *flush_mask; 708 struct ptc_stats *stat; 709 struct bau_control *bcp; 710 struct bau_control *tbcp; 711 712 /* kernel was booted 'nobau' */ 713 if (nobau) 714 return cpumask; 715 716 bcp = &per_cpu(bau_control, cpu); 717 stat = bcp->statp; 718 719 /* bau was disabled due to slow response */ 720 if (bcp->baudisabled) { 721 /* the cpu that disabled it must re-enable it */ 722 if (bcp->set_bau_off) { 723 if (get_cycles() >= bcp->set_bau_on_time) { 724 stat->s_bau_reenabled++; 725 baudisabled = 0; 726 for_each_present_cpu(tcpu) { 727 tbcp = &per_cpu(bau_control, tcpu); 728 tbcp->baudisabled = 0; 729 tbcp->period_requests = 0; 730 tbcp->period_time = 0; 731 } 732 } 733 } 734 return cpumask; 735 } 736 737 /* 738 * Each sending cpu has a per-cpu mask which it fills from the caller's 739 * cpu mask. All cpus are converted to uvhubs and copied to the 740 * activation descriptor. 741 */ 742 flush_mask = (struct cpumask *)per_cpu(uv_flush_tlb_mask, cpu); 743 /* don't actually do a shootdown of the local cpu */ 744 cpumask_andnot(flush_mask, cpumask, cpumask_of(cpu)); 745 if (cpu_isset(cpu, *cpumask)) 746 stat->s_ntargself++; 747 748 bau_desc = bcp->descriptor_base; 749 bau_desc += UV_ITEMS_PER_DESCRIPTOR * bcp->uvhub_cpu; 750 bau_uvhubs_clear(&bau_desc->distribution, UV_DISTRIBUTION_SIZE); 751 752 /* cpu statistics */ 753 for_each_cpu(tcpu, flush_mask) { 754 uvhub = uv_cpu_to_blade_id(tcpu); 755 bau_uvhub_set(uvhub, &bau_desc->distribution); 756 if (uvhub == bcp->uvhub) 757 locals++; 758 else 759 remotes++; 760 } 761 if ((locals + remotes) == 0) 762 return NULL; 763 stat->s_requestor++; 764 stat->s_ntargcpu += remotes + locals; 765 stat->s_ntargremotes += remotes; 766 stat->s_ntarglocals += locals; 767 remotes = bau_uvhub_weight(&bau_desc->distribution); 768 769 /* uvhub statistics */ 770 hubs = bau_uvhub_weight(&bau_desc->distribution); 771 if (locals) { 772 stat->s_ntarglocaluvhub++; 773 stat->s_ntargremoteuvhub += (hubs - 1); 774 } else 775 stat->s_ntargremoteuvhub += hubs; 776 stat->s_ntarguvhub += hubs; 777 if (hubs >= 16) 778 stat->s_ntarguvhub16++; 779 else if (hubs >= 8) 780 stat->s_ntarguvhub8++; 781 else if (hubs >= 4) 782 stat->s_ntarguvhub4++; 783 else if (hubs >= 2) 784 stat->s_ntarguvhub2++; 785 else 786 stat->s_ntarguvhub1++; 787 788 bau_desc->payload.address = va; 789 bau_desc->payload.sending_cpu = cpu; 790 791 /* 792 * uv_flush_send_and_wait returns 0 if all cpu's were messaged, 793 * or 1 if it gave up and the original cpumask should be returned. 794 */ 795 if (!uv_flush_send_and_wait(bau_desc, flush_mask, bcp)) 796 return NULL; 797 else 798 return cpumask; 799} 800 801/* 802 * The BAU message interrupt comes here. (registered by set_intr_gate) 803 * See entry_64.S 804 * 805 * We received a broadcast assist message. 806 * 807 * Interrupts are disabled; this interrupt could represent 808 * the receipt of several messages. 809 * 810 * All cores/threads on this hub get this interrupt. 811 * The last one to see it does the software ack. 812 * (the resource will not be freed until noninterruptable cpus see this 813 * interrupt; hardware may timeout the s/w ack and reply ERROR) 814 */ 815void uv_bau_message_interrupt(struct pt_regs *regs) 816{ 817 int count = 0; 818 cycles_t time_start; 819 struct bau_payload_queue_entry *msg; 820 struct bau_control *bcp; 821 struct ptc_stats *stat; 822 struct msg_desc msgdesc; 823 824 time_start = get_cycles(); 825 bcp = &per_cpu(bau_control, smp_processor_id()); 826 stat = bcp->statp; 827 msgdesc.va_queue_first = bcp->va_queue_first; 828 msgdesc.va_queue_last = bcp->va_queue_last; 829 msg = bcp->bau_msg_head; 830 while (msg->sw_ack_vector) { 831 count++; 832 msgdesc.msg_slot = msg - msgdesc.va_queue_first; 833 msgdesc.sw_ack_slot = ffs(msg->sw_ack_vector) - 1; 834 msgdesc.msg = msg; 835 uv_bau_process_message(&msgdesc, bcp); 836 msg++; 837 if (msg > msgdesc.va_queue_last) 838 msg = msgdesc.va_queue_first; 839 bcp->bau_msg_head = msg; 840 } 841 stat->d_time += (get_cycles() - time_start); 842 if (!count) 843 stat->d_nomsg++; 844 else if (count > 1) 845 stat->d_multmsg++; 846 ack_APIC_irq(); 847} 848 849/* 850 * uv_enable_timeouts 851 * 852 * Each target uvhub (i.e. a uvhub that has no cpu's) needs to have 853 * shootdown message timeouts enabled. The timeout does not cause 854 * an interrupt, but causes an error message to be returned to 855 * the sender. 856 */ 857static void uv_enable_timeouts(void) 858{ 859 int uvhub; 860 int nuvhubs; 861 int pnode; 862 unsigned long mmr_image; 863 864 nuvhubs = uv_num_possible_blades(); 865 866 for (uvhub = 0; uvhub < nuvhubs; uvhub++) { 867 if (!uv_blade_nr_possible_cpus(uvhub)) 868 continue; 869 870 pnode = uv_blade_to_pnode(uvhub); 871 mmr_image = 872 uv_read_global_mmr64(pnode, UVH_LB_BAU_MISC_CONTROL); 873 /* 874 * Set the timeout period and then lock it in, in three 875 * steps; captures and locks in the period. 876 * 877 * To program the period, the SOFT_ACK_MODE must be off. 878 */ 879 mmr_image &= ~((unsigned long)1 << 880 UVH_LB_BAU_MISC_CONTROL_ENABLE_INTD_SOFT_ACK_MODE_SHFT); 881 uv_write_global_mmr64 882 (pnode, UVH_LB_BAU_MISC_CONTROL, mmr_image); 883 /* 884 * Set the 4-bit period. 885 */ 886 mmr_image &= ~((unsigned long)0xf << 887 UVH_LB_BAU_MISC_CONTROL_INTD_SOFT_ACK_TIMEOUT_PERIOD_SHFT); 888 mmr_image |= (UV_INTD_SOFT_ACK_TIMEOUT_PERIOD << 889 UVH_LB_BAU_MISC_CONTROL_INTD_SOFT_ACK_TIMEOUT_PERIOD_SHFT); 890 uv_write_global_mmr64 891 (pnode, UVH_LB_BAU_MISC_CONTROL, mmr_image); 892 /* 893 * Subsequent reversals of the timebase bit (3) cause an 894 * immediate timeout of one or all INTD resources as 895 * indicated in bits 2:0 (7 causes all of them to timeout). 896 */ 897 mmr_image |= ((unsigned long)1 << 898 UVH_LB_BAU_MISC_CONTROL_ENABLE_INTD_SOFT_ACK_MODE_SHFT); 899 uv_write_global_mmr64 900 (pnode, UVH_LB_BAU_MISC_CONTROL, mmr_image); 901 } 902} 903 904static void *uv_ptc_seq_start(struct seq_file *file, loff_t *offset) 905{ 906 if (*offset < num_possible_cpus()) 907 return offset; 908 return NULL; 909} 910 911static void *uv_ptc_seq_next(struct seq_file *file, void *data, loff_t *offset) 912{ 913 (*offset)++; 914 if (*offset < num_possible_cpus()) 915 return offset; 916 return NULL; 917} 918 919static void uv_ptc_seq_stop(struct seq_file *file, void *data) 920{ 921} 922 923static inline unsigned long long 924microsec_2_cycles(unsigned long microsec) 925{ 926 unsigned long ns; 927 unsigned long long cyc; 928 929 ns = microsec * 1000; 930 cyc = (ns << CYC2NS_SCALE_FACTOR)/(per_cpu(cyc2ns, smp_processor_id())); 931 return cyc; 932} 933 934/* 935 * Display the statistics thru /proc. 936 * 'data' points to the cpu number 937 */ 938static int uv_ptc_seq_show(struct seq_file *file, void *data) 939{ 940 struct ptc_stats *stat; 941 int cpu; 942 943 cpu = *(loff_t *)data; 944 945 if (!cpu) { 946 seq_printf(file, 947 "# cpu sent stime self locals remotes ncpus localhub "); 948 seq_printf(file, 949 "remotehub numuvhubs numuvhubs16 numuvhubs8 "); 950 seq_printf(file, 951 "numuvhubs4 numuvhubs2 numuvhubs1 dto "); 952 seq_printf(file, 953 "retries rok resetp resett giveup sto bz throt "); 954 seq_printf(file, 955 "sw_ack recv rtime all "); 956 seq_printf(file, 957 "one mult none retry canc nocan reset rcan "); 958 seq_printf(file, 959 "disable enable\n"); 960 } 961 if (cpu < num_possible_cpus() && cpu_online(cpu)) { 962 stat = &per_cpu(ptcstats, cpu); 963 /* source side statistics */ 964 seq_printf(file, 965 "cpu %d %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld ", 966 cpu, stat->s_requestor, cycles_2_us(stat->s_time), 967 stat->s_ntargself, stat->s_ntarglocals, 968 stat->s_ntargremotes, stat->s_ntargcpu, 969 stat->s_ntarglocaluvhub, stat->s_ntargremoteuvhub, 970 stat->s_ntarguvhub, stat->s_ntarguvhub16); 971 seq_printf(file, "%ld %ld %ld %ld %ld ", 972 stat->s_ntarguvhub8, stat->s_ntarguvhub4, 973 stat->s_ntarguvhub2, stat->s_ntarguvhub1, 974 stat->s_dtimeout); 975 seq_printf(file, "%ld %ld %ld %ld %ld %ld %ld %ld ", 976 stat->s_retry_messages, stat->s_retriesok, 977 stat->s_resets_plug, stat->s_resets_timeout, 978 stat->s_giveup, stat->s_stimeout, 979 stat->s_busy, stat->s_throttles); 980 981 /* destination side statistics */ 982 seq_printf(file, 983 "%lx %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld ", 984 uv_read_global_mmr64(uv_cpu_to_pnode(cpu), 985 UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE), 986 stat->d_requestee, cycles_2_us(stat->d_time), 987 stat->d_alltlb, stat->d_onetlb, stat->d_multmsg, 988 stat->d_nomsg, stat->d_retries, stat->d_canceled, 989 stat->d_nocanceled, stat->d_resets, 990 stat->d_rcanceled); 991 seq_printf(file, "%ld %ld\n", 992 stat->s_bau_disabled, stat->s_bau_reenabled); 993 } 994 995 return 0; 996} 997 998/* 999 * Display the tunables thru debugfs 1000 */ 1001static ssize_t tunables_read(struct file *file, char __user *userbuf, 1002 size_t count, loff_t *ppos) 1003{ 1004 char buf[300]; 1005 int ret; 1006 1007 ret = snprintf(buf, 300, "%s %s %s\n%d %d %d %d %d %d %d %d %d\n", 1008 "max_bau_concurrent plugged_delay plugsb4reset", 1009 "timeoutsb4reset ipi_reset_limit complete_threshold", 1010 "congested_response_us congested_reps congested_period", 1011 max_bau_concurrent, plugged_delay, plugsb4reset, 1012 timeoutsb4reset, ipi_reset_limit, complete_threshold, 1013 congested_response_us, congested_reps, congested_period); 1014 1015 return simple_read_from_buffer(userbuf, count, ppos, buf, ret); 1016} 1017 1018/* 1019 * -1: resetf the statistics 1020 * 0: display meaning of the statistics 1021 */ 1022static ssize_t uv_ptc_proc_write(struct file *file, const char __user *user, 1023 size_t count, loff_t *data) 1024{ 1025 int cpu; 1026 long input_arg; 1027 char optstr[64]; 1028 struct ptc_stats *stat; 1029 1030 if (count == 0 || count > sizeof(optstr)) 1031 return -EINVAL; 1032 if (copy_from_user(optstr, user, count)) 1033 return -EFAULT; 1034 optstr[count - 1] = '\0'; 1035 if (strict_strtol(optstr, 10, &input_arg) < 0) { 1036 printk(KERN_DEBUG "%s is invalid\n", optstr); 1037 return -EINVAL; 1038 } 1039 1040 if (input_arg == 0) { 1041 printk(KERN_DEBUG "# cpu: cpu number\n"); 1042 printk(KERN_DEBUG "Sender statistics:\n"); 1043 printk(KERN_DEBUG 1044 "sent: number of shootdown messages sent\n"); 1045 printk(KERN_DEBUG 1046 "stime: time spent sending messages\n"); 1047 printk(KERN_DEBUG 1048 "numuvhubs: number of hubs targeted with shootdown\n"); 1049 printk(KERN_DEBUG 1050 "numuvhubs16: number times 16 or more hubs targeted\n"); 1051 printk(KERN_DEBUG 1052 "numuvhubs8: number times 8 or more hubs targeted\n"); 1053 printk(KERN_DEBUG 1054 "numuvhubs4: number times 4 or more hubs targeted\n"); 1055 printk(KERN_DEBUG 1056 "numuvhubs2: number times 2 or more hubs targeted\n"); 1057 printk(KERN_DEBUG 1058 "numuvhubs1: number times 1 hub targeted\n"); 1059 printk(KERN_DEBUG 1060 "numcpus: number of cpus targeted with shootdown\n"); 1061 printk(KERN_DEBUG 1062 "dto: number of destination timeouts\n"); 1063 printk(KERN_DEBUG 1064 "retries: destination timeout retries sent\n"); 1065 printk(KERN_DEBUG 1066 "rok: : destination timeouts successfully retried\n"); 1067 printk(KERN_DEBUG 1068 "resetp: ipi-style resource resets for plugs\n"); 1069 printk(KERN_DEBUG 1070 "resett: ipi-style resource resets for timeouts\n"); 1071 printk(KERN_DEBUG 1072 "giveup: fall-backs to ipi-style shootdowns\n"); 1073 printk(KERN_DEBUG 1074 "sto: number of source timeouts\n"); 1075 printk(KERN_DEBUG 1076 "bz: number of stay-busy's\n"); 1077 printk(KERN_DEBUG 1078 "throt: number times spun in throttle\n"); 1079 printk(KERN_DEBUG "Destination side statistics:\n"); 1080 printk(KERN_DEBUG 1081 "sw_ack: image of UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE\n"); 1082 printk(KERN_DEBUG 1083 "recv: shootdown messages received\n"); 1084 printk(KERN_DEBUG 1085 "rtime: time spent processing messages\n"); 1086 printk(KERN_DEBUG 1087 "all: shootdown all-tlb messages\n"); 1088 printk(KERN_DEBUG 1089 "one: shootdown one-tlb messages\n"); 1090 printk(KERN_DEBUG 1091 "mult: interrupts that found multiple messages\n"); 1092 printk(KERN_DEBUG 1093 "none: interrupts that found no messages\n"); 1094 printk(KERN_DEBUG 1095 "retry: number of retry messages processed\n"); 1096 printk(KERN_DEBUG 1097 "canc: number messages canceled by retries\n"); 1098 printk(KERN_DEBUG 1099 "nocan: number retries that found nothing to cancel\n"); 1100 printk(KERN_DEBUG 1101 "reset: number of ipi-style reset requests processed\n"); 1102 printk(KERN_DEBUG 1103 "rcan: number messages canceled by reset requests\n"); 1104 printk(KERN_DEBUG 1105 "disable: number times use of the BAU was disabled\n"); 1106 printk(KERN_DEBUG 1107 "enable: number times use of the BAU was re-enabled\n"); 1108 } else if (input_arg == -1) { 1109 for_each_present_cpu(cpu) { 1110 stat = &per_cpu(ptcstats, cpu); 1111 memset(stat, 0, sizeof(struct ptc_stats)); 1112 } 1113 } 1114 1115 return count; 1116} 1117 1118static int local_atoi(const char *name) 1119{ 1120 int val = 0; 1121 1122 for (;; name++) { 1123 switch (*name) { 1124 case '0' ... '9': 1125 val = 10*val+(*name-'0'); 1126 break; 1127 default: 1128 return val; 1129 } 1130 } 1131} 1132 1133/* 1134 * set the tunables 1135 * 0 values reset them to defaults 1136 */ 1137static ssize_t tunables_write(struct file *file, const char __user *user, 1138 size_t count, loff_t *data) 1139{ 1140 int cpu; 1141 int cnt = 0; 1142 int val; 1143 char *p; 1144 char *q; 1145 char instr[64]; 1146 struct bau_control *bcp; 1147 1148 if (count == 0 || count > sizeof(instr)-1) 1149 return -EINVAL; 1150 if (copy_from_user(instr, user, count)) 1151 return -EFAULT; 1152 1153 instr[count] = '\0'; 1154 /* count the fields */ 1155 p = instr + strspn(instr, WHITESPACE); 1156 q = p; 1157 for (; *p; p = q + strspn(q, WHITESPACE)) { 1158 q = p + strcspn(p, WHITESPACE); 1159 cnt++; 1160 if (q == p) 1161 break; 1162 } 1163 if (cnt != 9) { 1164 printk(KERN_INFO "bau tunable error: should be 9 numbers\n"); 1165 return -EINVAL; 1166 } 1167 1168 p = instr + strspn(instr, WHITESPACE); 1169 q = p; 1170 for (cnt = 0; *p; p = q + strspn(q, WHITESPACE), cnt++) { 1171 q = p + strcspn(p, WHITESPACE); 1172 val = local_atoi(p); 1173 switch (cnt) { 1174 case 0: 1175 if (val == 0) { 1176 max_bau_concurrent = MAX_BAU_CONCURRENT; 1177 max_bau_concurrent_constant = 1178 MAX_BAU_CONCURRENT; 1179 continue; 1180 } 1181 bcp = &per_cpu(bau_control, smp_processor_id()); 1182 if (val < 1 || val > bcp->cpus_in_uvhub) { 1183 printk(KERN_DEBUG 1184 "Error: BAU max concurrent %d is invalid\n", 1185 val); 1186 return -EINVAL; 1187 } 1188 max_bau_concurrent = val; 1189 max_bau_concurrent_constant = val; 1190 continue; 1191 case 1: 1192 if (val == 0) 1193 plugged_delay = PLUGGED_DELAY; 1194 else 1195 plugged_delay = val; 1196 continue; 1197 case 2: 1198 if (val == 0) 1199 plugsb4reset = PLUGSB4RESET; 1200 else 1201 plugsb4reset = val; 1202 continue; 1203 case 3: 1204 if (val == 0) 1205 timeoutsb4reset = TIMEOUTSB4RESET; 1206 else 1207 timeoutsb4reset = val; 1208 continue; 1209 case 4: 1210 if (val == 0) 1211 ipi_reset_limit = IPI_RESET_LIMIT; 1212 else 1213 ipi_reset_limit = val; 1214 continue; 1215 case 5: 1216 if (val == 0) 1217 complete_threshold = COMPLETE_THRESHOLD; 1218 else 1219 complete_threshold = val; 1220 continue; 1221 case 6: 1222 if (val == 0) 1223 congested_response_us = CONGESTED_RESPONSE_US; 1224 else 1225 congested_response_us = val; 1226 continue; 1227 case 7: 1228 if (val == 0) 1229 congested_reps = CONGESTED_REPS; 1230 else 1231 congested_reps = val; 1232 continue; 1233 case 8: 1234 if (val == 0) 1235 congested_period = CONGESTED_PERIOD; 1236 else 1237 congested_period = val; 1238 continue; 1239 } 1240 if (q == p) 1241 break; 1242 } 1243 for_each_present_cpu(cpu) { 1244 bcp = &per_cpu(bau_control, cpu); 1245 bcp->max_bau_concurrent = max_bau_concurrent; 1246 bcp->max_bau_concurrent_constant = max_bau_concurrent; 1247 bcp->plugged_delay = plugged_delay; 1248 bcp->plugsb4reset = plugsb4reset; 1249 bcp->timeoutsb4reset = timeoutsb4reset; 1250 bcp->ipi_reset_limit = ipi_reset_limit; 1251 bcp->complete_threshold = complete_threshold; 1252 bcp->congested_response_us = congested_response_us; 1253 bcp->congested_reps = congested_reps; 1254 bcp->congested_period = congested_period; 1255 } 1256 return count; 1257} 1258 1259static const struct seq_operations uv_ptc_seq_ops = { 1260 .start = uv_ptc_seq_start, 1261 .next = uv_ptc_seq_next, 1262 .stop = uv_ptc_seq_stop, 1263 .show = uv_ptc_seq_show 1264}; 1265 1266static int uv_ptc_proc_open(struct inode *inode, struct file *file) 1267{ 1268 return seq_open(file, &uv_ptc_seq_ops); 1269} 1270 1271static int tunables_open(struct inode *inode, struct file *file) 1272{ 1273 return 0; 1274} 1275 1276static const struct file_operations proc_uv_ptc_operations = { 1277 .open = uv_ptc_proc_open, 1278 .read = seq_read, 1279 .write = uv_ptc_proc_write, 1280 .llseek = seq_lseek, 1281 .release = seq_release, 1282}; 1283 1284static const struct file_operations tunables_fops = { 1285 .open = tunables_open, 1286 .read = tunables_read, 1287 .write = tunables_write, 1288}; 1289 1290static int __init uv_ptc_init(void) 1291{ 1292 struct proc_dir_entry *proc_uv_ptc; 1293 1294 if (!is_uv_system()) 1295 return 0; 1296 1297 proc_uv_ptc = proc_create(UV_PTC_BASENAME, 0444, NULL, 1298 &proc_uv_ptc_operations); 1299 if (!proc_uv_ptc) { 1300 printk(KERN_ERR "unable to create %s proc entry\n", 1301 UV_PTC_BASENAME); 1302 return -EINVAL; 1303 } 1304 1305 tunables_dir = debugfs_create_dir(UV_BAU_TUNABLES_DIR, NULL); 1306 if (!tunables_dir) { 1307 printk(KERN_ERR "unable to create debugfs directory %s\n", 1308 UV_BAU_TUNABLES_DIR); 1309 return -EINVAL; 1310 } 1311 tunables_file = debugfs_create_file(UV_BAU_TUNABLES_FILE, 0600, 1312 tunables_dir, NULL, &tunables_fops); 1313 if (!tunables_file) { 1314 printk(KERN_ERR "unable to create debugfs file %s\n", 1315 UV_BAU_TUNABLES_FILE); 1316 return -EINVAL; 1317 } 1318 return 0; 1319} 1320 1321/* 1322 * initialize the sending side's sending buffers 1323 */ 1324static void 1325uv_activation_descriptor_init(int node, int pnode) 1326{ 1327 int i; 1328 int cpu; 1329 unsigned long pa; 1330 unsigned long m; 1331 unsigned long n; 1332 struct bau_desc *bau_desc; 1333 struct bau_desc *bd2; 1334 struct bau_control *bcp; 1335 1336 /* 1337 * each bau_desc is 64 bytes; there are 8 (UV_ITEMS_PER_DESCRIPTOR) 1338 * per cpu; and up to 32 (UV_ADP_SIZE) cpu's per uvhub 1339 */ 1340 bau_desc = (struct bau_desc *)kmalloc_node(sizeof(struct bau_desc)* 1341 UV_ADP_SIZE*UV_ITEMS_PER_DESCRIPTOR, GFP_KERNEL, node); 1342 BUG_ON(!bau_desc); 1343 1344 pa = uv_gpa(bau_desc); /* need the real nasid*/ 1345 n = pa >> uv_nshift; 1346 m = pa & uv_mmask; 1347 1348 uv_write_global_mmr64(pnode, UVH_LB_BAU_SB_DESCRIPTOR_BASE, 1349 (n << UV_DESC_BASE_PNODE_SHIFT | m)); 1350 1351 /* 1352 * initializing all 8 (UV_ITEMS_PER_DESCRIPTOR) descriptors for each 1353 * cpu even though we only use the first one; one descriptor can 1354 * describe a broadcast to 256 uv hubs. 1355 */ 1356 for (i = 0, bd2 = bau_desc; i < (UV_ADP_SIZE*UV_ITEMS_PER_DESCRIPTOR); 1357 i++, bd2++) { 1358 memset(bd2, 0, sizeof(struct bau_desc)); 1359 bd2->header.sw_ack_flag = 1; 1360 /* 1361 * base_dest_nodeid is the nasid (pnode<<1) of the first uvhub 1362 * in the partition. The bit map will indicate uvhub numbers, 1363 * which are 0-N in a partition. Pnodes are unique system-wide. 1364 */ 1365 bd2->header.base_dest_nodeid = uv_partition_base_pnode << 1; 1366 bd2->header.dest_subnodeid = 0x10; /* the LB */ 1367 bd2->header.command = UV_NET_ENDPOINT_INTD; 1368 bd2->header.int_both = 1; 1369 /* 1370 * all others need to be set to zero: 1371 * fairness chaining multilevel count replied_to 1372 */ 1373 } 1374 for_each_present_cpu(cpu) { 1375 if (pnode != uv_blade_to_pnode(uv_cpu_to_blade_id(cpu))) 1376 continue; 1377 bcp = &per_cpu(bau_control, cpu); 1378 bcp->descriptor_base = bau_desc; 1379 } 1380} 1381 1382/* 1383 * initialize the destination side's receiving buffers 1384 * entered for each uvhub in the partition 1385 * - node is first node (kernel memory notion) on the uvhub 1386 * - pnode is the uvhub's physical identifier 1387 */ 1388static void 1389uv_payload_queue_init(int node, int pnode) 1390{ 1391 int pn; 1392 int cpu; 1393 char *cp; 1394 unsigned long pa; 1395 struct bau_payload_queue_entry *pqp; 1396 struct bau_payload_queue_entry *pqp_malloc; 1397 struct bau_control *bcp; 1398 1399 pqp = (struct bau_payload_queue_entry *) kmalloc_node( 1400 (DEST_Q_SIZE + 1) * sizeof(struct bau_payload_queue_entry), 1401 GFP_KERNEL, node); 1402 BUG_ON(!pqp); 1403 pqp_malloc = pqp; 1404 1405 cp = (char *)pqp + 31; 1406 pqp = (struct bau_payload_queue_entry *)(((unsigned long)cp >> 5) << 5); 1407 1408 for_each_present_cpu(cpu) { 1409 if (pnode != uv_cpu_to_pnode(cpu)) 1410 continue; 1411 /* for every cpu on this pnode: */ 1412 bcp = &per_cpu(bau_control, cpu); 1413 bcp->va_queue_first = pqp; 1414 bcp->bau_msg_head = pqp; 1415 bcp->va_queue_last = pqp + (DEST_Q_SIZE - 1); 1416 } 1417 /* 1418 * need the pnode of where the memory was really allocated 1419 */ 1420 pa = uv_gpa(pqp); 1421 pn = pa >> uv_nshift; 1422 uv_write_global_mmr64(pnode, 1423 UVH_LB_BAU_INTD_PAYLOAD_QUEUE_FIRST, 1424 ((unsigned long)pn << UV_PAYLOADQ_PNODE_SHIFT) | 1425 uv_physnodeaddr(pqp)); 1426 uv_write_global_mmr64(pnode, UVH_LB_BAU_INTD_PAYLOAD_QUEUE_TAIL, 1427 uv_physnodeaddr(pqp)); 1428 uv_write_global_mmr64(pnode, UVH_LB_BAU_INTD_PAYLOAD_QUEUE_LAST, 1429 (unsigned long) 1430 uv_physnodeaddr(pqp + (DEST_Q_SIZE - 1))); 1431 /* in effect, all msg_type's are set to MSG_NOOP */ 1432 memset(pqp, 0, sizeof(struct bau_payload_queue_entry) * DEST_Q_SIZE); 1433} 1434 1435/* 1436 * Initialization of each UV hub's structures 1437 */ 1438static void __init uv_init_uvhub(int uvhub, int vector) 1439{ 1440 int node; 1441 int pnode; 1442 unsigned long apicid; 1443 1444 node = uvhub_to_first_node(uvhub); 1445 pnode = uv_blade_to_pnode(uvhub); 1446 uv_activation_descriptor_init(node, pnode); 1447 uv_payload_queue_init(node, pnode); 1448 /* 1449 * the below initialization can't be in firmware because the 1450 * messaging IRQ will be determined by the OS 1451 */ 1452 apicid = uvhub_to_first_apicid(uvhub); 1453 uv_write_global_mmr64(pnode, UVH_BAU_DATA_CONFIG, 1454 ((apicid << 32) | vector)); 1455} 1456 1457/* 1458 * We will set BAU_MISC_CONTROL with a timeout period. 1459 * But the BIOS has set UVH_AGING_PRESCALE_SEL and UVH_TRANSACTION_TIMEOUT. 1460 * So the destination timeout period has be be calculated from them. 1461 */ 1462static int 1463calculate_destination_timeout(void) 1464{ 1465 unsigned long mmr_image; 1466 int mult1; 1467 int mult2; 1468 int index; 1469 int base; 1470 int ret; 1471 unsigned long ts_ns; 1472 1473 mult1 = UV_INTD_SOFT_ACK_TIMEOUT_PERIOD & BAU_MISC_CONTROL_MULT_MASK; 1474 mmr_image = uv_read_local_mmr(UVH_AGING_PRESCALE_SEL); 1475 index = (mmr_image >> BAU_URGENCY_7_SHIFT) & BAU_URGENCY_7_MASK; 1476 mmr_image = uv_read_local_mmr(UVH_TRANSACTION_TIMEOUT); 1477 mult2 = (mmr_image >> BAU_TRANS_SHIFT) & BAU_TRANS_MASK; 1478 base = timeout_base_ns[index]; 1479 ts_ns = base * mult1 * mult2; 1480 ret = ts_ns / 1000; 1481 return ret; 1482} 1483 1484/* 1485 * initialize the bau_control structure for each cpu 1486 */ 1487static void __init uv_init_per_cpu(int nuvhubs) 1488{ 1489 int i; 1490 int cpu; 1491 int pnode; 1492 int uvhub; 1493 int have_hmaster; 1494 short socket = 0; 1495 unsigned short socket_mask; 1496 unsigned char *uvhub_mask; 1497 struct bau_control *bcp; 1498 struct uvhub_desc *bdp; 1499 struct socket_desc *sdp; 1500 struct bau_control *hmaster = NULL; 1501 struct bau_control *smaster = NULL; 1502 struct socket_desc { 1503 short num_cpus; 1504 short cpu_number[16]; 1505 }; 1506 struct uvhub_desc { 1507 unsigned short socket_mask; 1508 short num_cpus; 1509 short uvhub; 1510 short pnode; 1511 struct socket_desc socket[2]; 1512 }; 1513 struct uvhub_desc *uvhub_descs; 1514 1515 timeout_us = calculate_destination_timeout(); 1516 1517 uvhub_descs = (struct uvhub_desc *) 1518 kmalloc(nuvhubs * sizeof(struct uvhub_desc), GFP_KERNEL); 1519 memset(uvhub_descs, 0, nuvhubs * sizeof(struct uvhub_desc)); 1520 uvhub_mask = kzalloc((nuvhubs+7)/8, GFP_KERNEL); 1521 for_each_present_cpu(cpu) { 1522 bcp = &per_cpu(bau_control, cpu); 1523 memset(bcp, 0, sizeof(struct bau_control)); 1524 pnode = uv_cpu_hub_info(cpu)->pnode; 1525 uvhub = uv_cpu_hub_info(cpu)->numa_blade_id; 1526 *(uvhub_mask + (uvhub/8)) |= (1 << (uvhub%8)); 1527 bdp = &uvhub_descs[uvhub]; 1528 bdp->num_cpus++; 1529 bdp->uvhub = uvhub; 1530 bdp->pnode = pnode; 1531 /* kludge: 'assuming' one node per socket, and assuming that 1532 disabling a socket just leaves a gap in node numbers */ 1533 socket = (cpu_to_node(cpu) & 1); 1534 bdp->socket_mask |= (1 << socket); 1535 sdp = &bdp->socket[socket]; 1536 sdp->cpu_number[sdp->num_cpus] = cpu; 1537 sdp->num_cpus++; 1538 } 1539 for (uvhub = 0; uvhub < nuvhubs; uvhub++) { 1540 if (!(*(uvhub_mask + (uvhub/8)) & (1 << (uvhub%8)))) 1541 continue; 1542 have_hmaster = 0; 1543 bdp = &uvhub_descs[uvhub]; 1544 socket_mask = bdp->socket_mask; 1545 socket = 0; 1546 while (socket_mask) { 1547 if (!(socket_mask & 1)) 1548 goto nextsocket; 1549 sdp = &bdp->socket[socket]; 1550 for (i = 0; i < sdp->num_cpus; i++) { 1551 cpu = sdp->cpu_number[i]; 1552 bcp = &per_cpu(bau_control, cpu); 1553 bcp->cpu = cpu; 1554 if (i == 0) { 1555 smaster = bcp; 1556 if (!have_hmaster) { 1557 have_hmaster++; 1558 hmaster = bcp; 1559 } 1560 } 1561 bcp->cpus_in_uvhub = bdp->num_cpus; 1562 bcp->cpus_in_socket = sdp->num_cpus; 1563 bcp->socket_master = smaster; 1564 bcp->uvhub = bdp->uvhub; 1565 bcp->uvhub_master = hmaster; 1566 bcp->uvhub_cpu = uv_cpu_hub_info(cpu)-> 1567 blade_processor_id; 1568 } 1569nextsocket: 1570 socket++; 1571 socket_mask = (socket_mask >> 1); 1572 } 1573 } 1574 kfree(uvhub_descs); 1575 kfree(uvhub_mask); 1576 for_each_present_cpu(cpu) { 1577 bcp = &per_cpu(bau_control, cpu); 1578 bcp->baudisabled = 0; 1579 bcp->statp = &per_cpu(ptcstats, cpu); 1580 /* time interval to catch a hardware stay-busy bug */ 1581 bcp->timeout_interval = microsec_2_cycles(2*timeout_us); 1582 bcp->max_bau_concurrent = max_bau_concurrent; 1583 bcp->max_bau_concurrent_constant = max_bau_concurrent; 1584 bcp->plugged_delay = plugged_delay; 1585 bcp->plugsb4reset = plugsb4reset; 1586 bcp->timeoutsb4reset = timeoutsb4reset; 1587 bcp->ipi_reset_limit = ipi_reset_limit; 1588 bcp->complete_threshold = complete_threshold; 1589 bcp->congested_response_us = congested_response_us; 1590 bcp->congested_reps = congested_reps; 1591 bcp->congested_period = congested_period; 1592 } 1593} 1594 1595/* 1596 * Initialization of BAU-related structures 1597 */ 1598static int __init uv_bau_init(void) 1599{ 1600 int uvhub; 1601 int pnode; 1602 int nuvhubs; 1603 int cur_cpu; 1604 int vector; 1605 unsigned long mmr; 1606 1607 if (!is_uv_system()) 1608 return 0; 1609 1610 if (nobau) 1611 return 0; 1612 1613 for_each_possible_cpu(cur_cpu) 1614 zalloc_cpumask_var_node(&per_cpu(uv_flush_tlb_mask, cur_cpu), 1615 GFP_KERNEL, cpu_to_node(cur_cpu)); 1616 1617 uv_nshift = uv_hub_info->m_val; 1618 uv_mmask = (1UL << uv_hub_info->m_val) - 1; 1619 nuvhubs = uv_num_possible_blades(); 1620 spin_lock_init(&disable_lock); 1621 congested_cycles = microsec_2_cycles(congested_response_us); 1622 1623 uv_init_per_cpu(nuvhubs); 1624 1625 uv_partition_base_pnode = 0x7fffffff; 1626 for (uvhub = 0; uvhub < nuvhubs; uvhub++) 1627 if (uv_blade_nr_possible_cpus(uvhub) && 1628 (uv_blade_to_pnode(uvhub) < uv_partition_base_pnode)) 1629 uv_partition_base_pnode = uv_blade_to_pnode(uvhub); 1630 1631 vector = UV_BAU_MESSAGE; 1632 for_each_possible_blade(uvhub) 1633 if (uv_blade_nr_possible_cpus(uvhub)) 1634 uv_init_uvhub(uvhub, vector); 1635 1636 uv_enable_timeouts(); 1637 alloc_intr_gate(vector, uv_bau_message_intr1); 1638 1639 for_each_possible_blade(uvhub) { 1640 if (uv_blade_nr_possible_cpus(uvhub)) { 1641 pnode = uv_blade_to_pnode(uvhub); 1642 /* INIT the bau */ 1643 uv_write_global_mmr64(pnode, 1644 UVH_LB_BAU_SB_ACTIVATION_CONTROL, 1645 ((unsigned long)1 << 63)); 1646 mmr = 1; /* should be 1 to broadcast to both sockets */ 1647 uv_write_global_mmr64(pnode, UVH_BAU_DATA_BROADCAST, 1648 mmr); 1649 } 1650 } 1651 1652 return 0; 1653} 1654core_initcall(uv_bau_init); 1655fs_initcall(uv_ptc_init); 1656