tlb_uv.c revision 8191c9f69202d4dbc66063cb92059b8a58640d34
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; 1005 int ret; 1006 1007 buf = kasprintf(GFP_KERNEL, "%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 if (!buf) 1016 return -ENOMEM; 1017 1018 ret = simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf)); 1019 kfree(buf); 1020 return ret; 1021} 1022 1023/* 1024 * -1: resetf the statistics 1025 * 0: display meaning of the statistics 1026 */ 1027static ssize_t uv_ptc_proc_write(struct file *file, const char __user *user, 1028 size_t count, loff_t *data) 1029{ 1030 int cpu; 1031 long input_arg; 1032 char optstr[64]; 1033 struct ptc_stats *stat; 1034 1035 if (count == 0 || count > sizeof(optstr)) 1036 return -EINVAL; 1037 if (copy_from_user(optstr, user, count)) 1038 return -EFAULT; 1039 optstr[count - 1] = '\0'; 1040 if (strict_strtol(optstr, 10, &input_arg) < 0) { 1041 printk(KERN_DEBUG "%s is invalid\n", optstr); 1042 return -EINVAL; 1043 } 1044 1045 if (input_arg == 0) { 1046 printk(KERN_DEBUG "# cpu: cpu number\n"); 1047 printk(KERN_DEBUG "Sender statistics:\n"); 1048 printk(KERN_DEBUG 1049 "sent: number of shootdown messages sent\n"); 1050 printk(KERN_DEBUG 1051 "stime: time spent sending messages\n"); 1052 printk(KERN_DEBUG 1053 "numuvhubs: number of hubs targeted with shootdown\n"); 1054 printk(KERN_DEBUG 1055 "numuvhubs16: number times 16 or more hubs targeted\n"); 1056 printk(KERN_DEBUG 1057 "numuvhubs8: number times 8 or more hubs targeted\n"); 1058 printk(KERN_DEBUG 1059 "numuvhubs4: number times 4 or more hubs targeted\n"); 1060 printk(KERN_DEBUG 1061 "numuvhubs2: number times 2 or more hubs targeted\n"); 1062 printk(KERN_DEBUG 1063 "numuvhubs1: number times 1 hub targeted\n"); 1064 printk(KERN_DEBUG 1065 "numcpus: number of cpus targeted with shootdown\n"); 1066 printk(KERN_DEBUG 1067 "dto: number of destination timeouts\n"); 1068 printk(KERN_DEBUG 1069 "retries: destination timeout retries sent\n"); 1070 printk(KERN_DEBUG 1071 "rok: : destination timeouts successfully retried\n"); 1072 printk(KERN_DEBUG 1073 "resetp: ipi-style resource resets for plugs\n"); 1074 printk(KERN_DEBUG 1075 "resett: ipi-style resource resets for timeouts\n"); 1076 printk(KERN_DEBUG 1077 "giveup: fall-backs to ipi-style shootdowns\n"); 1078 printk(KERN_DEBUG 1079 "sto: number of source timeouts\n"); 1080 printk(KERN_DEBUG 1081 "bz: number of stay-busy's\n"); 1082 printk(KERN_DEBUG 1083 "throt: number times spun in throttle\n"); 1084 printk(KERN_DEBUG "Destination side statistics:\n"); 1085 printk(KERN_DEBUG 1086 "sw_ack: image of UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE\n"); 1087 printk(KERN_DEBUG 1088 "recv: shootdown messages received\n"); 1089 printk(KERN_DEBUG 1090 "rtime: time spent processing messages\n"); 1091 printk(KERN_DEBUG 1092 "all: shootdown all-tlb messages\n"); 1093 printk(KERN_DEBUG 1094 "one: shootdown one-tlb messages\n"); 1095 printk(KERN_DEBUG 1096 "mult: interrupts that found multiple messages\n"); 1097 printk(KERN_DEBUG 1098 "none: interrupts that found no messages\n"); 1099 printk(KERN_DEBUG 1100 "retry: number of retry messages processed\n"); 1101 printk(KERN_DEBUG 1102 "canc: number messages canceled by retries\n"); 1103 printk(KERN_DEBUG 1104 "nocan: number retries that found nothing to cancel\n"); 1105 printk(KERN_DEBUG 1106 "reset: number of ipi-style reset requests processed\n"); 1107 printk(KERN_DEBUG 1108 "rcan: number messages canceled by reset requests\n"); 1109 printk(KERN_DEBUG 1110 "disable: number times use of the BAU was disabled\n"); 1111 printk(KERN_DEBUG 1112 "enable: number times use of the BAU was re-enabled\n"); 1113 } else if (input_arg == -1) { 1114 for_each_present_cpu(cpu) { 1115 stat = &per_cpu(ptcstats, cpu); 1116 memset(stat, 0, sizeof(struct ptc_stats)); 1117 } 1118 } 1119 1120 return count; 1121} 1122 1123static int local_atoi(const char *name) 1124{ 1125 int val = 0; 1126 1127 for (;; name++) { 1128 switch (*name) { 1129 case '0' ... '9': 1130 val = 10*val+(*name-'0'); 1131 break; 1132 default: 1133 return val; 1134 } 1135 } 1136} 1137 1138/* 1139 * set the tunables 1140 * 0 values reset them to defaults 1141 */ 1142static ssize_t tunables_write(struct file *file, const char __user *user, 1143 size_t count, loff_t *data) 1144{ 1145 int cpu; 1146 int cnt = 0; 1147 int val; 1148 char *p; 1149 char *q; 1150 char instr[64]; 1151 struct bau_control *bcp; 1152 1153 if (count == 0 || count > sizeof(instr)-1) 1154 return -EINVAL; 1155 if (copy_from_user(instr, user, count)) 1156 return -EFAULT; 1157 1158 instr[count] = '\0'; 1159 /* count the fields */ 1160 p = instr + strspn(instr, WHITESPACE); 1161 q = p; 1162 for (; *p; p = q + strspn(q, WHITESPACE)) { 1163 q = p + strcspn(p, WHITESPACE); 1164 cnt++; 1165 if (q == p) 1166 break; 1167 } 1168 if (cnt != 9) { 1169 printk(KERN_INFO "bau tunable error: should be 9 numbers\n"); 1170 return -EINVAL; 1171 } 1172 1173 p = instr + strspn(instr, WHITESPACE); 1174 q = p; 1175 for (cnt = 0; *p; p = q + strspn(q, WHITESPACE), cnt++) { 1176 q = p + strcspn(p, WHITESPACE); 1177 val = local_atoi(p); 1178 switch (cnt) { 1179 case 0: 1180 if (val == 0) { 1181 max_bau_concurrent = MAX_BAU_CONCURRENT; 1182 max_bau_concurrent_constant = 1183 MAX_BAU_CONCURRENT; 1184 continue; 1185 } 1186 bcp = &per_cpu(bau_control, smp_processor_id()); 1187 if (val < 1 || val > bcp->cpus_in_uvhub) { 1188 printk(KERN_DEBUG 1189 "Error: BAU max concurrent %d is invalid\n", 1190 val); 1191 return -EINVAL; 1192 } 1193 max_bau_concurrent = val; 1194 max_bau_concurrent_constant = val; 1195 continue; 1196 case 1: 1197 if (val == 0) 1198 plugged_delay = PLUGGED_DELAY; 1199 else 1200 plugged_delay = val; 1201 continue; 1202 case 2: 1203 if (val == 0) 1204 plugsb4reset = PLUGSB4RESET; 1205 else 1206 plugsb4reset = val; 1207 continue; 1208 case 3: 1209 if (val == 0) 1210 timeoutsb4reset = TIMEOUTSB4RESET; 1211 else 1212 timeoutsb4reset = val; 1213 continue; 1214 case 4: 1215 if (val == 0) 1216 ipi_reset_limit = IPI_RESET_LIMIT; 1217 else 1218 ipi_reset_limit = val; 1219 continue; 1220 case 5: 1221 if (val == 0) 1222 complete_threshold = COMPLETE_THRESHOLD; 1223 else 1224 complete_threshold = val; 1225 continue; 1226 case 6: 1227 if (val == 0) 1228 congested_response_us = CONGESTED_RESPONSE_US; 1229 else 1230 congested_response_us = val; 1231 continue; 1232 case 7: 1233 if (val == 0) 1234 congested_reps = CONGESTED_REPS; 1235 else 1236 congested_reps = val; 1237 continue; 1238 case 8: 1239 if (val == 0) 1240 congested_period = CONGESTED_PERIOD; 1241 else 1242 congested_period = val; 1243 continue; 1244 } 1245 if (q == p) 1246 break; 1247 } 1248 for_each_present_cpu(cpu) { 1249 bcp = &per_cpu(bau_control, cpu); 1250 bcp->max_bau_concurrent = max_bau_concurrent; 1251 bcp->max_bau_concurrent_constant = max_bau_concurrent; 1252 bcp->plugged_delay = plugged_delay; 1253 bcp->plugsb4reset = plugsb4reset; 1254 bcp->timeoutsb4reset = timeoutsb4reset; 1255 bcp->ipi_reset_limit = ipi_reset_limit; 1256 bcp->complete_threshold = complete_threshold; 1257 bcp->congested_response_us = congested_response_us; 1258 bcp->congested_reps = congested_reps; 1259 bcp->congested_period = congested_period; 1260 } 1261 return count; 1262} 1263 1264static const struct seq_operations uv_ptc_seq_ops = { 1265 .start = uv_ptc_seq_start, 1266 .next = uv_ptc_seq_next, 1267 .stop = uv_ptc_seq_stop, 1268 .show = uv_ptc_seq_show 1269}; 1270 1271static int uv_ptc_proc_open(struct inode *inode, struct file *file) 1272{ 1273 return seq_open(file, &uv_ptc_seq_ops); 1274} 1275 1276static int tunables_open(struct inode *inode, struct file *file) 1277{ 1278 return 0; 1279} 1280 1281static const struct file_operations proc_uv_ptc_operations = { 1282 .open = uv_ptc_proc_open, 1283 .read = seq_read, 1284 .write = uv_ptc_proc_write, 1285 .llseek = seq_lseek, 1286 .release = seq_release, 1287}; 1288 1289static const struct file_operations tunables_fops = { 1290 .open = tunables_open, 1291 .read = tunables_read, 1292 .write = tunables_write, 1293 .llseek = default_llseek, 1294}; 1295 1296static int __init uv_ptc_init(void) 1297{ 1298 struct proc_dir_entry *proc_uv_ptc; 1299 1300 if (!is_uv_system()) 1301 return 0; 1302 1303 proc_uv_ptc = proc_create(UV_PTC_BASENAME, 0444, NULL, 1304 &proc_uv_ptc_operations); 1305 if (!proc_uv_ptc) { 1306 printk(KERN_ERR "unable to create %s proc entry\n", 1307 UV_PTC_BASENAME); 1308 return -EINVAL; 1309 } 1310 1311 tunables_dir = debugfs_create_dir(UV_BAU_TUNABLES_DIR, NULL); 1312 if (!tunables_dir) { 1313 printk(KERN_ERR "unable to create debugfs directory %s\n", 1314 UV_BAU_TUNABLES_DIR); 1315 return -EINVAL; 1316 } 1317 tunables_file = debugfs_create_file(UV_BAU_TUNABLES_FILE, 0600, 1318 tunables_dir, NULL, &tunables_fops); 1319 if (!tunables_file) { 1320 printk(KERN_ERR "unable to create debugfs file %s\n", 1321 UV_BAU_TUNABLES_FILE); 1322 return -EINVAL; 1323 } 1324 return 0; 1325} 1326 1327/* 1328 * initialize the sending side's sending buffers 1329 */ 1330static void 1331uv_activation_descriptor_init(int node, int pnode) 1332{ 1333 int i; 1334 int cpu; 1335 unsigned long pa; 1336 unsigned long m; 1337 unsigned long n; 1338 struct bau_desc *bau_desc; 1339 struct bau_desc *bd2; 1340 struct bau_control *bcp; 1341 1342 /* 1343 * each bau_desc is 64 bytes; there are 8 (UV_ITEMS_PER_DESCRIPTOR) 1344 * per cpu; and up to 32 (UV_ADP_SIZE) cpu's per uvhub 1345 */ 1346 bau_desc = kmalloc_node(sizeof(struct bau_desc) * UV_ADP_SIZE 1347 * UV_ITEMS_PER_DESCRIPTOR, GFP_KERNEL, node); 1348 BUG_ON(!bau_desc); 1349 1350 pa = uv_gpa(bau_desc); /* need the real nasid*/ 1351 n = pa >> uv_nshift; 1352 m = pa & uv_mmask; 1353 1354 uv_write_global_mmr64(pnode, UVH_LB_BAU_SB_DESCRIPTOR_BASE, 1355 (n << UV_DESC_BASE_PNODE_SHIFT | m)); 1356 1357 /* 1358 * initializing all 8 (UV_ITEMS_PER_DESCRIPTOR) descriptors for each 1359 * cpu even though we only use the first one; one descriptor can 1360 * describe a broadcast to 256 uv hubs. 1361 */ 1362 for (i = 0, bd2 = bau_desc; i < (UV_ADP_SIZE*UV_ITEMS_PER_DESCRIPTOR); 1363 i++, bd2++) { 1364 memset(bd2, 0, sizeof(struct bau_desc)); 1365 bd2->header.sw_ack_flag = 1; 1366 /* 1367 * base_dest_nodeid is the nasid (pnode<<1) of the first uvhub 1368 * in the partition. The bit map will indicate uvhub numbers, 1369 * which are 0-N in a partition. Pnodes are unique system-wide. 1370 */ 1371 bd2->header.base_dest_nodeid = uv_partition_base_pnode << 1; 1372 bd2->header.dest_subnodeid = 0x10; /* the LB */ 1373 bd2->header.command = UV_NET_ENDPOINT_INTD; 1374 bd2->header.int_both = 1; 1375 /* 1376 * all others need to be set to zero: 1377 * fairness chaining multilevel count replied_to 1378 */ 1379 } 1380 for_each_present_cpu(cpu) { 1381 if (pnode != uv_blade_to_pnode(uv_cpu_to_blade_id(cpu))) 1382 continue; 1383 bcp = &per_cpu(bau_control, cpu); 1384 bcp->descriptor_base = bau_desc; 1385 } 1386} 1387 1388/* 1389 * initialize the destination side's receiving buffers 1390 * entered for each uvhub in the partition 1391 * - node is first node (kernel memory notion) on the uvhub 1392 * - pnode is the uvhub's physical identifier 1393 */ 1394static void 1395uv_payload_queue_init(int node, int pnode) 1396{ 1397 int pn; 1398 int cpu; 1399 char *cp; 1400 unsigned long pa; 1401 struct bau_payload_queue_entry *pqp; 1402 struct bau_payload_queue_entry *pqp_malloc; 1403 struct bau_control *bcp; 1404 1405 pqp = kmalloc_node((DEST_Q_SIZE + 1) 1406 * sizeof(struct bau_payload_queue_entry), 1407 GFP_KERNEL, node); 1408 BUG_ON(!pqp); 1409 pqp_malloc = pqp; 1410 1411 cp = (char *)pqp + 31; 1412 pqp = (struct bau_payload_queue_entry *)(((unsigned long)cp >> 5) << 5); 1413 1414 for_each_present_cpu(cpu) { 1415 if (pnode != uv_cpu_to_pnode(cpu)) 1416 continue; 1417 /* for every cpu on this pnode: */ 1418 bcp = &per_cpu(bau_control, cpu); 1419 bcp->va_queue_first = pqp; 1420 bcp->bau_msg_head = pqp; 1421 bcp->va_queue_last = pqp + (DEST_Q_SIZE - 1); 1422 } 1423 /* 1424 * need the pnode of where the memory was really allocated 1425 */ 1426 pa = uv_gpa(pqp); 1427 pn = pa >> uv_nshift; 1428 uv_write_global_mmr64(pnode, 1429 UVH_LB_BAU_INTD_PAYLOAD_QUEUE_FIRST, 1430 ((unsigned long)pn << UV_PAYLOADQ_PNODE_SHIFT) | 1431 uv_physnodeaddr(pqp)); 1432 uv_write_global_mmr64(pnode, UVH_LB_BAU_INTD_PAYLOAD_QUEUE_TAIL, 1433 uv_physnodeaddr(pqp)); 1434 uv_write_global_mmr64(pnode, UVH_LB_BAU_INTD_PAYLOAD_QUEUE_LAST, 1435 (unsigned long) 1436 uv_physnodeaddr(pqp + (DEST_Q_SIZE - 1))); 1437 /* in effect, all msg_type's are set to MSG_NOOP */ 1438 memset(pqp, 0, sizeof(struct bau_payload_queue_entry) * DEST_Q_SIZE); 1439} 1440 1441/* 1442 * Initialization of each UV hub's structures 1443 */ 1444static void __init uv_init_uvhub(int uvhub, int vector) 1445{ 1446 int node; 1447 int pnode; 1448 unsigned long apicid; 1449 1450 node = uvhub_to_first_node(uvhub); 1451 pnode = uv_blade_to_pnode(uvhub); 1452 uv_activation_descriptor_init(node, pnode); 1453 uv_payload_queue_init(node, pnode); 1454 /* 1455 * the below initialization can't be in firmware because the 1456 * messaging IRQ will be determined by the OS 1457 */ 1458 apicid = uvhub_to_first_apicid(uvhub) | uv_apicid_hibits; 1459 uv_write_global_mmr64(pnode, UVH_BAU_DATA_CONFIG, 1460 ((apicid << 32) | vector)); 1461} 1462 1463/* 1464 * We will set BAU_MISC_CONTROL with a timeout period. 1465 * But the BIOS has set UVH_AGING_PRESCALE_SEL and UVH_TRANSACTION_TIMEOUT. 1466 * So the destination timeout period has be be calculated from them. 1467 */ 1468static int 1469calculate_destination_timeout(void) 1470{ 1471 unsigned long mmr_image; 1472 int mult1; 1473 int mult2; 1474 int index; 1475 int base; 1476 int ret; 1477 unsigned long ts_ns; 1478 1479 mult1 = UV_INTD_SOFT_ACK_TIMEOUT_PERIOD & BAU_MISC_CONTROL_MULT_MASK; 1480 mmr_image = uv_read_local_mmr(UVH_AGING_PRESCALE_SEL); 1481 index = (mmr_image >> BAU_URGENCY_7_SHIFT) & BAU_URGENCY_7_MASK; 1482 mmr_image = uv_read_local_mmr(UVH_TRANSACTION_TIMEOUT); 1483 mult2 = (mmr_image >> BAU_TRANS_SHIFT) & BAU_TRANS_MASK; 1484 base = timeout_base_ns[index]; 1485 ts_ns = base * mult1 * mult2; 1486 ret = ts_ns / 1000; 1487 return ret; 1488} 1489 1490/* 1491 * initialize the bau_control structure for each cpu 1492 */ 1493static void __init uv_init_per_cpu(int nuvhubs) 1494{ 1495 int i; 1496 int cpu; 1497 int pnode; 1498 int uvhub; 1499 int have_hmaster; 1500 short socket = 0; 1501 unsigned short socket_mask; 1502 unsigned char *uvhub_mask; 1503 struct bau_control *bcp; 1504 struct uvhub_desc *bdp; 1505 struct socket_desc *sdp; 1506 struct bau_control *hmaster = NULL; 1507 struct bau_control *smaster = NULL; 1508 struct socket_desc { 1509 short num_cpus; 1510 short cpu_number[16]; 1511 }; 1512 struct uvhub_desc { 1513 unsigned short socket_mask; 1514 short num_cpus; 1515 short uvhub; 1516 short pnode; 1517 struct socket_desc socket[2]; 1518 }; 1519 struct uvhub_desc *uvhub_descs; 1520 1521 timeout_us = calculate_destination_timeout(); 1522 1523 uvhub_descs = kmalloc(nuvhubs * sizeof(struct uvhub_desc), GFP_KERNEL); 1524 memset(uvhub_descs, 0, nuvhubs * sizeof(struct uvhub_desc)); 1525 uvhub_mask = kzalloc((nuvhubs+7)/8, GFP_KERNEL); 1526 for_each_present_cpu(cpu) { 1527 bcp = &per_cpu(bau_control, cpu); 1528 memset(bcp, 0, sizeof(struct bau_control)); 1529 pnode = uv_cpu_hub_info(cpu)->pnode; 1530 uvhub = uv_cpu_hub_info(cpu)->numa_blade_id; 1531 *(uvhub_mask + (uvhub/8)) |= (1 << (uvhub%8)); 1532 bdp = &uvhub_descs[uvhub]; 1533 bdp->num_cpus++; 1534 bdp->uvhub = uvhub; 1535 bdp->pnode = pnode; 1536 /* kludge: 'assuming' one node per socket, and assuming that 1537 disabling a socket just leaves a gap in node numbers */ 1538 socket = (cpu_to_node(cpu) & 1); 1539 bdp->socket_mask |= (1 << socket); 1540 sdp = &bdp->socket[socket]; 1541 sdp->cpu_number[sdp->num_cpus] = cpu; 1542 sdp->num_cpus++; 1543 } 1544 for (uvhub = 0; uvhub < nuvhubs; uvhub++) { 1545 if (!(*(uvhub_mask + (uvhub/8)) & (1 << (uvhub%8)))) 1546 continue; 1547 have_hmaster = 0; 1548 bdp = &uvhub_descs[uvhub]; 1549 socket_mask = bdp->socket_mask; 1550 socket = 0; 1551 while (socket_mask) { 1552 if (!(socket_mask & 1)) 1553 goto nextsocket; 1554 sdp = &bdp->socket[socket]; 1555 for (i = 0; i < sdp->num_cpus; i++) { 1556 cpu = sdp->cpu_number[i]; 1557 bcp = &per_cpu(bau_control, cpu); 1558 bcp->cpu = cpu; 1559 if (i == 0) { 1560 smaster = bcp; 1561 if (!have_hmaster) { 1562 have_hmaster++; 1563 hmaster = bcp; 1564 } 1565 } 1566 bcp->cpus_in_uvhub = bdp->num_cpus; 1567 bcp->cpus_in_socket = sdp->num_cpus; 1568 bcp->socket_master = smaster; 1569 bcp->uvhub = bdp->uvhub; 1570 bcp->uvhub_master = hmaster; 1571 bcp->uvhub_cpu = uv_cpu_hub_info(cpu)-> 1572 blade_processor_id; 1573 } 1574nextsocket: 1575 socket++; 1576 socket_mask = (socket_mask >> 1); 1577 } 1578 } 1579 kfree(uvhub_descs); 1580 kfree(uvhub_mask); 1581 for_each_present_cpu(cpu) { 1582 bcp = &per_cpu(bau_control, cpu); 1583 bcp->baudisabled = 0; 1584 bcp->statp = &per_cpu(ptcstats, cpu); 1585 /* time interval to catch a hardware stay-busy bug */ 1586 bcp->timeout_interval = microsec_2_cycles(2*timeout_us); 1587 bcp->max_bau_concurrent = max_bau_concurrent; 1588 bcp->max_bau_concurrent_constant = max_bau_concurrent; 1589 bcp->plugged_delay = plugged_delay; 1590 bcp->plugsb4reset = plugsb4reset; 1591 bcp->timeoutsb4reset = timeoutsb4reset; 1592 bcp->ipi_reset_limit = ipi_reset_limit; 1593 bcp->complete_threshold = complete_threshold; 1594 bcp->congested_response_us = congested_response_us; 1595 bcp->congested_reps = congested_reps; 1596 bcp->congested_period = congested_period; 1597 } 1598} 1599 1600/* 1601 * Initialization of BAU-related structures 1602 */ 1603static int __init uv_bau_init(void) 1604{ 1605 int uvhub; 1606 int pnode; 1607 int nuvhubs; 1608 int cur_cpu; 1609 int vector; 1610 unsigned long mmr; 1611 1612 if (!is_uv_system()) 1613 return 0; 1614 1615 if (nobau) 1616 return 0; 1617 1618 for_each_possible_cpu(cur_cpu) 1619 zalloc_cpumask_var_node(&per_cpu(uv_flush_tlb_mask, cur_cpu), 1620 GFP_KERNEL, cpu_to_node(cur_cpu)); 1621 1622 uv_nshift = uv_hub_info->m_val; 1623 uv_mmask = (1UL << uv_hub_info->m_val) - 1; 1624 nuvhubs = uv_num_possible_blades(); 1625 spin_lock_init(&disable_lock); 1626 congested_cycles = microsec_2_cycles(congested_response_us); 1627 1628 uv_init_per_cpu(nuvhubs); 1629 1630 uv_partition_base_pnode = 0x7fffffff; 1631 for (uvhub = 0; uvhub < nuvhubs; uvhub++) 1632 if (uv_blade_nr_possible_cpus(uvhub) && 1633 (uv_blade_to_pnode(uvhub) < uv_partition_base_pnode)) 1634 uv_partition_base_pnode = uv_blade_to_pnode(uvhub); 1635 1636 vector = UV_BAU_MESSAGE; 1637 for_each_possible_blade(uvhub) 1638 if (uv_blade_nr_possible_cpus(uvhub)) 1639 uv_init_uvhub(uvhub, vector); 1640 1641 uv_enable_timeouts(); 1642 alloc_intr_gate(vector, uv_bau_message_intr1); 1643 1644 for_each_possible_blade(uvhub) { 1645 if (uv_blade_nr_possible_cpus(uvhub)) { 1646 pnode = uv_blade_to_pnode(uvhub); 1647 /* INIT the bau */ 1648 uv_write_global_mmr64(pnode, 1649 UVH_LB_BAU_SB_ACTIVATION_CONTROL, 1650 ((unsigned long)1 << 63)); 1651 mmr = 1; /* should be 1 to broadcast to both sockets */ 1652 uv_write_global_mmr64(pnode, UVH_BAU_DATA_BROADCAST, 1653 mmr); 1654 } 1655 } 1656 1657 return 0; 1658} 1659core_initcall(uv_bau_init); 1660fs_initcall(uv_ptc_init); 1661