arch/x86/kernel/tlb_uv.c

   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) */
  27 static int timeout_base_ns[] = {
  28                 20,
  29                 160,
  30                 1280,
  31                 10240,
  32                 81920,
  33                 655360,
  34                 5242880,
  35                 167772160
  36 };
  37 static int timeout_us;
  38 static int nobau;
  39 static int baudisabled;
  40 static spinlock_t disable_lock;
  41 static cycles_t congested_cycles;
  42
  43 /* tunables: */
  44 static int max_bau_concurrent = MAX_BAU_CONCURRENT;
  45 static int max_bau_concurrent_constant = MAX_BAU_CONCURRENT;
  46 static int plugged_delay = PLUGGED_DELAY;
  47 static int plugsb4reset = PLUGSB4RESET;
  48 static int timeoutsb4reset = TIMEOUTSB4RESET;
  49 static int ipi_reset_limit = IPI_RESET_LIMIT;
  50 static int complete_threshold = COMPLETE_THRESHOLD;
  51 static int congested_response_us = CONGESTED_RESPONSE_US;
  52 static int congested_reps = CONGESTED_REPS;
  53 static int congested_period = CONGESTED_PERIOD;
  54 static struct dentry *tunables_dir;
  55 static struct dentry *tunables_file;
  56
  57 static int __init setup_nobau(char *arg)
  58 {
  59         nobau = 1;
  60         return 0;
  61 }
  62 early_param("nobau", setup_nobau);
  63
  64 /* base pnode in this partition */
  65 static int uv_partition_base_pnode __read_mostly;
  66 /* position of pnode (which is nasid>>1): */
  67 static int uv_nshift __read_mostly;
  68 static unsigned long uv_mmask __read_mostly;
  69
  70 static DEFINE_PER_CPU(struct ptc_stats, ptcstats);
  71 static DEFINE_PER_CPU(struct bau_control, bau_control);
  72 static 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  */
  78 static 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  */
  93 static 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  */
 111 static 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  */
 131 static 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  */
 194 static 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  */
 257 static 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  */
 276 static void
 277 uv_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  */
 336 static 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
 362 static inline unsigned long
 363 cycles_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  */
 378 static inline void
 379 quiesce_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  */
 388 static inline void
 389 end_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  */
 399 static 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
 454 static inline cycles_t
 455 sec_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  */
 475 static 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  */
 492 static void
 493 destination_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
 510 static void
 511 destination_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  */
 532 static void
 533 disable_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  */
 569 int 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  */
 697 const 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  */
 815 void 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  */
 857 static 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
 904 static 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
 911 static 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
 919 static void uv_ptc_seq_stop(struct seq_file *file, void *data)
 920 {
 921 }
 922
 923 static inline unsigned long long
 924 microsec_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  */
 938 static 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  */
1001 static 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  */
1027 static 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
1123 static 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  */
1142 static 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
1264 static 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
1271 static int uv_ptc_proc_open(struct inode *inode, struct file *file)
1272 {
1273         return seq_open(file, &uv_ptc_seq_ops);
1274 }
1275
1276 static int tunables_open(struct inode *inode, struct file *file)
1277 {
1278         return 0;
1279 }
1280
1281 static 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
1289 static const struct file_operations tunables_fops = {
1290         .open           = tunables_open,
1291         .read           = tunables_read,
1292         .write          = tunables_write,
1293         .llseek         = default_llseek,
1294 };
1295
1296 static 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  */
1330 static void
1331 uv_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 = (struct bau_desc *)kmalloc_node(sizeof(struct bau_desc)*
1347                 UV_ADP_SIZE*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  */
1394 static void
1395 uv_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 = (struct bau_payload_queue_entry *) kmalloc_node(
1406                 (DEST_Q_SIZE + 1) * 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  */
1444 static 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);
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  */
1468 static int
1469 calculate_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  */
1493 static 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 = (struct uvhub_desc *)
1524                 kmalloc(nuvhubs * sizeof(struct uvhub_desc), GFP_KERNEL);
1525         memset(uvhub_descs, 0, nuvhubs * sizeof(struct uvhub_desc));
1526         uvhub_mask = kzalloc((nuvhubs+7)/8, GFP_KERNEL);
1527         for_each_present_cpu(cpu) {
1528                 bcp = &per_cpu(bau_control, cpu);
1529                 memset(bcp, 0, sizeof(struct bau_control));
1530                 pnode = uv_cpu_hub_info(cpu)->pnode;
1531                 uvhub = uv_cpu_hub_info(cpu)->numa_blade_id;
1532                 *(uvhub_mask + (uvhub/8)) |= (1 << (uvhub%8));
1533                 bdp = &uvhub_descs[uvhub];
1534                 bdp->num_cpus++;
1535                 bdp->uvhub = uvhub;
1536                 bdp->pnode = pnode;
1537                 /* kludge: 'assuming' one node per socket, and assuming that
1538                    disabling a socket just leaves a gap in node numbers */
1539                 socket = (cpu_to_node(cpu) & 1);
1540                 bdp->socket_mask |= (1 << socket);
1541                 sdp = &bdp->socket[socket];
1542                 sdp->cpu_number[sdp->num_cpus] = cpu;
1543                 sdp->num_cpus++;
1544         }
1545         for (uvhub = 0; uvhub < nuvhubs; uvhub++) {
1546                 if (!(*(uvhub_mask + (uvhub/8)) & (1 << (uvhub%8))))
1547                         continue;
1548                 have_hmaster = 0;
1549                 bdp = &uvhub_descs[uvhub];
1550                 socket_mask = bdp->socket_mask;
1551                 socket = 0;
1552                 while (socket_mask) {
1553                         if (!(socket_mask & 1))
1554                                 goto nextsocket;
1555                         sdp = &bdp->socket[socket];
1556                         for (i = 0; i < sdp->num_cpus; i++) {
1557                                 cpu = sdp->cpu_number[i];
1558                                 bcp = &per_cpu(bau_control, cpu);
1559                                 bcp->cpu = cpu;
1560                                 if (i == 0) {
1561                                         smaster = bcp;
1562                                         if (!have_hmaster) {
1563                                                 have_hmaster++;
1564                                                 hmaster = bcp;
1565                                         }
1566                                 }
1567                                 bcp->cpus_in_uvhub = bdp->num_cpus;
1568                                 bcp->cpus_in_socket = sdp->num_cpus;
1569                                 bcp->socket_master = smaster;
1570                                 bcp->uvhub = bdp->uvhub;
1571                                 bcp->uvhub_master = hmaster;
1572                                 bcp->uvhub_cpu = uv_cpu_hub_info(cpu)->
1573                                                 blade_processor_id;
1574                         }
1575 nextsocket:
1576                         socket++;
1577                         socket_mask = (socket_mask >> 1);
1578                 }
1579         }
1580         kfree(uvhub_descs);
1581         kfree(uvhub_mask);
1582         for_each_present_cpu(cpu) {
1583                 bcp = &per_cpu(bau_control, cpu);
1584                 bcp->baudisabled = 0;
1585                 bcp->statp = &per_cpu(ptcstats, cpu);
1586                 /* time interval to catch a hardware stay-busy bug */
1587                 bcp->timeout_interval = microsec_2_cycles(2*timeout_us);
1588                 bcp->max_bau_concurrent = max_bau_concurrent;
1589                 bcp->max_bau_concurrent_constant = max_bau_concurrent;
1590                 bcp->plugged_delay = plugged_delay;
1591                 bcp->plugsb4reset = plugsb4reset;
1592                 bcp->timeoutsb4reset = timeoutsb4reset;
1593                 bcp->ipi_reset_limit = ipi_reset_limit;
1594                 bcp->complete_threshold = complete_threshold;
1595                 bcp->congested_response_us = congested_response_us;
1596                 bcp->congested_reps = congested_reps;
1597                 bcp->congested_period = congested_period;
1598         }
1599 }
1600
1601 /*
1602  * Initialization of BAU-related structures
1603  */
1604 static int __init uv_bau_init(void)
1605 {
1606         int uvhub;
1607         int pnode;
1608         int nuvhubs;
1609         int cur_cpu;
1610         int vector;
1611         unsigned long mmr;
1612
1613         if (!is_uv_system())
1614                 return 0;
1615
1616         if (nobau)
1617                 return 0;
1618
1619         for_each_possible_cpu(cur_cpu)
1620                 zalloc_cpumask_var_node(&per_cpu(uv_flush_tlb_mask, cur_cpu),
1621                                        GFP_KERNEL, cpu_to_node(cur_cpu));
1622
1623         uv_nshift = uv_hub_info->m_val;
1624         uv_mmask = (1UL << uv_hub_info->m_val) - 1;
1625         nuvhubs = uv_num_possible_blades();
1626         spin_lock_init(&disable_lock);
1627         congested_cycles = microsec_2_cycles(congested_response_us);
1628
1629         uv_init_per_cpu(nuvhubs);
1630
1631         uv_partition_base_pnode = 0x7fffffff;
1632         for (uvhub = 0; uvhub < nuvhubs; uvhub++)
1633                 if (uv_blade_nr_possible_cpus(uvhub) &&
1634                         (uv_blade_to_pnode(uvhub) < uv_partition_base_pnode))
1635                         uv_partition_base_pnode = uv_blade_to_pnode(uvhub);
1636
1637         vector = UV_BAU_MESSAGE;
1638         for_each_possible_blade(uvhub)
1639                 if (uv_blade_nr_possible_cpus(uvhub))
1640                         uv_init_uvhub(uvhub, vector);
1641
1642         uv_enable_timeouts();
1643         alloc_intr_gate(vector, uv_bau_message_intr1);
1644
1645         for_each_possible_blade(uvhub) {
1646                 if (uv_blade_nr_possible_cpus(uvhub)) {
1647                         pnode = uv_blade_to_pnode(uvhub);
1648                         /* INIT the bau */
1649                         uv_write_global_mmr64(pnode,
1650                                         UVH_LB_BAU_SB_ACTIVATION_CONTROL,
1651                                         ((unsigned long)1 << 63));
1652                         mmr = 1; /* should be 1 to broadcast to both sockets */
1653                         uv_write_global_mmr64(pnode, UVH_BAU_DATA_BROADCAST,
1654                                                 mmr);
1655                 }
1656         }
1657
1658         return 0;
1659 }
1660 core_initcall(uv_bau_init);
1661 fs_initcall(uv_ptc_init);