| 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/kernel.h> |
| 12 | #include <linux/slab.h> |
| 13 | |
| 14 | #include <asm/mmu_context.h> |
| 15 | #include <asm/uv/uv.h> |
| 16 | #include <asm/uv/uv_mmrs.h> |
| 17 | #include <asm/uv/uv_hub.h> |
| 18 | #include <asm/uv/uv_bau.h> |
| 19 | #include <asm/apic.h> |
| 20 | #include <asm/idle.h> |
| 21 | #include <asm/tsc.h> |
| 22 | #include <asm/irq_vectors.h> |
| 23 | #include <asm/timer.h> |
| 24 | |
| 25 | struct msg_desc { |
| 26 | struct bau_payload_queue_entry *msg; |
| 27 | int msg_slot; |
| 28 | int sw_ack_slot; |
| 29 | struct bau_payload_queue_entry *va_queue_first; |
| 30 | struct bau_payload_queue_entry *va_queue_last; |
| 31 | }; |
| 32 | |
| 33 | #define UV_INTD_SOFT_ACK_TIMEOUT_PERIOD 0x000000000bUL |
| 34 | |
| 35 | static int uv_bau_max_concurrent __read_mostly; |
| 36 | |
| 37 | static int nobau; |
| 38 | static int __init setup_nobau(char *arg) |
| 39 | { |
| 40 | nobau = 1; |
| 41 | return 0; |
| 42 | } |
| 43 | early_param("nobau", setup_nobau); |
| 44 | |
| 45 | /* base pnode in this partition */ |
| 46 | static int uv_partition_base_pnode __read_mostly; |
| 47 | /* position of pnode (which is nasid>>1): */ |
| 48 | static int uv_nshift __read_mostly; |
| 49 | static unsigned long uv_mmask __read_mostly; |
| 50 | |
| 51 | static DEFINE_PER_CPU(struct ptc_stats, ptcstats); |
| 52 | static DEFINE_PER_CPU(struct bau_control, bau_control); |
| 53 | static DEFINE_PER_CPU(cpumask_var_t, uv_flush_tlb_mask); |
| 54 | |
| 55 | struct reset_args { |
| 56 | int sender; |
| 57 | }; |
| 58 | |
| 59 | /* |
| 60 | * Determine the first node on a uvhub. 'Nodes' are used for kernel |
| 61 | * memory allocation. |
| 62 | */ |
| 63 | static int __init uvhub_to_first_node(int uvhub) |
| 64 | { |
| 65 | int node, b; |
| 66 | |
| 67 | for_each_online_node(node) { |
| 68 | b = uv_node_to_blade_id(node); |
| 69 | if (uvhub == b) |
| 70 | return node; |
| 71 | } |
| 72 | return -1; |
| 73 | } |
| 74 | |
| 75 | /* |
| 76 | * Determine the apicid of the first cpu on a uvhub. |
| 77 | */ |
| 78 | static int __init uvhub_to_first_apicid(int uvhub) |
| 79 | { |
| 80 | int cpu; |
| 81 | |
| 82 | for_each_present_cpu(cpu) |
| 83 | if (uvhub == uv_cpu_to_blade_id(cpu)) |
| 84 | return per_cpu(x86_cpu_to_apicid, cpu); |
| 85 | return -1; |
| 86 | } |
| 87 | |
| 88 | /* |
| 89 | * Free a software acknowledge hardware resource by clearing its Pending |
| 90 | * bit. This will return a reply to the sender. |
| 91 | * If the message has timed out, a reply has already been sent by the |
| 92 | * hardware but the resource has not been released. In that case our |
| 93 | * clear of the Timeout bit (as well) will free the resource. No reply will |
| 94 | * be sent (the hardware will only do one reply per message). |
| 95 | */ |
| 96 | static inline void uv_reply_to_message(struct msg_desc *mdp, |
| 97 | struct bau_control *bcp) |
| 98 | { |
| 99 | unsigned long dw; |
| 100 | struct bau_payload_queue_entry *msg; |
| 101 | |
| 102 | msg = mdp->msg; |
| 103 | if (!msg->canceled) { |
| 104 | dw = (msg->sw_ack_vector << UV_SW_ACK_NPENDING) | |
| 105 | msg->sw_ack_vector; |
| 106 | uv_write_local_mmr( |
| 107 | UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS, dw); |
| 108 | } |
| 109 | msg->replied_to = 1; |
| 110 | msg->sw_ack_vector = 0; |
| 111 | } |
| 112 | |
| 113 | /* |
| 114 | * Process the receipt of a RETRY message |
| 115 | */ |
| 116 | static inline void uv_bau_process_retry_msg(struct msg_desc *mdp, |
| 117 | struct bau_control *bcp) |
| 118 | { |
| 119 | int i; |
| 120 | int cancel_count = 0; |
| 121 | int slot2; |
| 122 | unsigned long msg_res; |
| 123 | unsigned long mmr = 0; |
| 124 | struct bau_payload_queue_entry *msg; |
| 125 | struct bau_payload_queue_entry *msg2; |
| 126 | struct ptc_stats *stat; |
| 127 | |
| 128 | msg = mdp->msg; |
| 129 | stat = &per_cpu(ptcstats, bcp->cpu); |
| 130 | stat->d_retries++; |
| 131 | /* |
| 132 | * cancel any message from msg+1 to the retry itself |
| 133 | */ |
| 134 | for (msg2 = msg+1, i = 0; i < DEST_Q_SIZE; msg2++, i++) { |
| 135 | if (msg2 > mdp->va_queue_last) |
| 136 | msg2 = mdp->va_queue_first; |
| 137 | if (msg2 == msg) |
| 138 | break; |
| 139 | |
| 140 | /* same conditions for cancellation as uv_do_reset */ |
| 141 | if ((msg2->replied_to == 0) && (msg2->canceled == 0) && |
| 142 | (msg2->sw_ack_vector) && ((msg2->sw_ack_vector & |
| 143 | msg->sw_ack_vector) == 0) && |
| 144 | (msg2->sending_cpu == msg->sending_cpu) && |
| 145 | (msg2->msg_type != MSG_NOOP)) { |
| 146 | slot2 = msg2 - mdp->va_queue_first; |
| 147 | mmr = uv_read_local_mmr |
| 148 | (UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE); |
| 149 | msg_res = ((msg2->sw_ack_vector << 8) | |
| 150 | msg2->sw_ack_vector); |
| 151 | /* |
| 152 | * This is a message retry; clear the resources held |
| 153 | * by the previous message only if they timed out. |
| 154 | * If it has not timed out we have an unexpected |
| 155 | * situation to report. |
| 156 | */ |
| 157 | if (mmr & (msg_res << 8)) { |
| 158 | /* |
| 159 | * is the resource timed out? |
| 160 | * make everyone ignore the cancelled message. |
| 161 | */ |
| 162 | msg2->canceled = 1; |
| 163 | stat->d_canceled++; |
| 164 | cancel_count++; |
| 165 | uv_write_local_mmr( |
| 166 | UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS, |
| 167 | (msg_res << 8) | msg_res); |
| 168 | } else |
| 169 | printk(KERN_INFO "note bau retry: no effect\n"); |
| 170 | } |
| 171 | } |
| 172 | if (!cancel_count) |
| 173 | stat->d_nocanceled++; |
| 174 | } |
| 175 | |
| 176 | /* |
| 177 | * Do all the things a cpu should do for a TLB shootdown message. |
| 178 | * Other cpu's may come here at the same time for this message. |
| 179 | */ |
| 180 | static void uv_bau_process_message(struct msg_desc *mdp, |
| 181 | struct bau_control *bcp) |
| 182 | { |
| 183 | int msg_ack_count; |
| 184 | short socket_ack_count = 0; |
| 185 | struct ptc_stats *stat; |
| 186 | struct bau_payload_queue_entry *msg; |
| 187 | struct bau_control *smaster = bcp->socket_master; |
| 188 | |
| 189 | /* |
| 190 | * This must be a normal message, or retry of a normal message |
| 191 | */ |
| 192 | msg = mdp->msg; |
| 193 | stat = &per_cpu(ptcstats, bcp->cpu); |
| 194 | if (msg->address == TLB_FLUSH_ALL) { |
| 195 | local_flush_tlb(); |
| 196 | stat->d_alltlb++; |
| 197 | } else { |
| 198 | __flush_tlb_one(msg->address); |
| 199 | stat->d_onetlb++; |
| 200 | } |
| 201 | stat->d_requestee++; |
| 202 | |
| 203 | /* |
| 204 | * One cpu on each uvhub has the additional job on a RETRY |
| 205 | * of releasing the resource held by the message that is |
| 206 | * being retried. That message is identified by sending |
| 207 | * cpu number. |
| 208 | */ |
| 209 | if (msg->msg_type == MSG_RETRY && bcp == bcp->uvhub_master) |
| 210 | uv_bau_process_retry_msg(mdp, bcp); |
| 211 | |
| 212 | /* |
| 213 | * This is a sw_ack message, so we have to reply to it. |
| 214 | * Count each responding cpu on the socket. This avoids |
| 215 | * pinging the count's cache line back and forth between |
| 216 | * the sockets. |
| 217 | */ |
| 218 | socket_ack_count = atomic_add_short_return(1, (struct atomic_short *) |
| 219 | &smaster->socket_acknowledge_count[mdp->msg_slot]); |
| 220 | if (socket_ack_count == bcp->cpus_in_socket) { |
| 221 | /* |
| 222 | * Both sockets dump their completed count total into |
| 223 | * the message's count. |
| 224 | */ |
| 225 | smaster->socket_acknowledge_count[mdp->msg_slot] = 0; |
| 226 | msg_ack_count = atomic_add_short_return(socket_ack_count, |
| 227 | (struct atomic_short *)&msg->acknowledge_count); |
| 228 | |
| 229 | if (msg_ack_count == bcp->cpus_in_uvhub) { |
| 230 | /* |
| 231 | * All cpus in uvhub saw it; reply |
| 232 | */ |
| 233 | uv_reply_to_message(mdp, bcp); |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | return; |
| 238 | } |
| 239 | |
| 240 | /* |
| 241 | * Determine the first cpu on a uvhub. |
| 242 | */ |
| 243 | static int uvhub_to_first_cpu(int uvhub) |
| 244 | { |
| 245 | int cpu; |
| 246 | for_each_present_cpu(cpu) |
| 247 | if (uvhub == uv_cpu_to_blade_id(cpu)) |
| 248 | return cpu; |
| 249 | return -1; |
| 250 | } |
| 251 | |
| 252 | /* |
| 253 | * Last resort when we get a large number of destination timeouts is |
| 254 | * to clear resources held by a given cpu. |
| 255 | * Do this with IPI so that all messages in the BAU message queue |
| 256 | * can be identified by their nonzero sw_ack_vector field. |
| 257 | * |
| 258 | * This is entered for a single cpu on the uvhub. |
| 259 | * The sender want's this uvhub to free a specific message's |
| 260 | * sw_ack resources. |
| 261 | */ |
| 262 | static void |
| 263 | uv_do_reset(void *ptr) |
| 264 | { |
| 265 | int i; |
| 266 | int slot; |
| 267 | int count = 0; |
| 268 | unsigned long mmr; |
| 269 | unsigned long msg_res; |
| 270 | struct bau_control *bcp; |
| 271 | struct reset_args *rap; |
| 272 | struct bau_payload_queue_entry *msg; |
| 273 | struct ptc_stats *stat; |
| 274 | |
| 275 | bcp = &per_cpu(bau_control, smp_processor_id()); |
| 276 | rap = (struct reset_args *)ptr; |
| 277 | stat = &per_cpu(ptcstats, bcp->cpu); |
| 278 | stat->d_resets++; |
| 279 | |
| 280 | /* |
| 281 | * We're looking for the given sender, and |
| 282 | * will free its sw_ack resource. |
| 283 | * If all cpu's finally responded after the timeout, its |
| 284 | * message 'replied_to' was set. |
| 285 | */ |
| 286 | for (msg = bcp->va_queue_first, i = 0; i < DEST_Q_SIZE; msg++, i++) { |
| 287 | /* uv_do_reset: same conditions for cancellation as |
| 288 | uv_bau_process_retry_msg() */ |
| 289 | if ((msg->replied_to == 0) && |
| 290 | (msg->canceled == 0) && |
| 291 | (msg->sending_cpu == rap->sender) && |
| 292 | (msg->sw_ack_vector) && |
| 293 | (msg->msg_type != MSG_NOOP)) { |
| 294 | /* |
| 295 | * make everyone else ignore this message |
| 296 | */ |
| 297 | msg->canceled = 1; |
| 298 | slot = msg - bcp->va_queue_first; |
| 299 | count++; |
| 300 | /* |
| 301 | * only reset the resource if it is still pending |
| 302 | */ |
| 303 | mmr = uv_read_local_mmr |
| 304 | (UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE); |
| 305 | msg_res = ((msg->sw_ack_vector << 8) | |
| 306 | msg->sw_ack_vector); |
| 307 | if (mmr & msg_res) { |
| 308 | stat->d_rcanceled++; |
| 309 | uv_write_local_mmr( |
| 310 | UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS, |
| 311 | msg_res); |
| 312 | } |
| 313 | } |
| 314 | } |
| 315 | return; |
| 316 | } |
| 317 | |
| 318 | /* |
| 319 | * Use IPI to get all target uvhubs to release resources held by |
| 320 | * a given sending cpu number. |
| 321 | */ |
| 322 | static void uv_reset_with_ipi(struct bau_target_uvhubmask *distribution, |
| 323 | int sender) |
| 324 | { |
| 325 | int uvhub; |
| 326 | int cpu; |
| 327 | cpumask_t mask; |
| 328 | struct reset_args reset_args; |
| 329 | |
| 330 | reset_args.sender = sender; |
| 331 | |
| 332 | cpus_clear(mask); |
| 333 | /* find a single cpu for each uvhub in this distribution mask */ |
| 334 | for (uvhub = 0; |
| 335 | uvhub < sizeof(struct bau_target_uvhubmask) * BITSPERBYTE; |
| 336 | uvhub++) { |
| 337 | if (!bau_uvhub_isset(uvhub, distribution)) |
| 338 | continue; |
| 339 | /* find a cpu for this uvhub */ |
| 340 | cpu = uvhub_to_first_cpu(uvhub); |
| 341 | cpu_set(cpu, mask); |
| 342 | } |
| 343 | /* IPI all cpus; Preemption is already disabled */ |
| 344 | smp_call_function_many(&mask, uv_do_reset, (void *)&reset_args, 1); |
| 345 | return; |
| 346 | } |
| 347 | |
| 348 | static inline unsigned long |
| 349 | cycles_2_us(unsigned long long cyc) |
| 350 | { |
| 351 | unsigned long long ns; |
| 352 | unsigned long us; |
| 353 | ns = (cyc * per_cpu(cyc2ns, smp_processor_id())) |
| 354 | >> CYC2NS_SCALE_FACTOR; |
| 355 | us = ns / 1000; |
| 356 | return us; |
| 357 | } |
| 358 | |
| 359 | /* |
| 360 | * wait for all cpus on this hub to finish their sends and go quiet |
| 361 | * leaves uvhub_quiesce set so that no new broadcasts are started by |
| 362 | * bau_flush_send_and_wait() |
| 363 | */ |
| 364 | static inline void |
| 365 | quiesce_local_uvhub(struct bau_control *hmaster) |
| 366 | { |
| 367 | atomic_add_short_return(1, (struct atomic_short *) |
| 368 | &hmaster->uvhub_quiesce); |
| 369 | } |
| 370 | |
| 371 | /* |
| 372 | * mark this quiet-requestor as done |
| 373 | */ |
| 374 | static inline void |
| 375 | end_uvhub_quiesce(struct bau_control *hmaster) |
| 376 | { |
| 377 | atomic_add_short_return(-1, (struct atomic_short *) |
| 378 | &hmaster->uvhub_quiesce); |
| 379 | } |
| 380 | |
| 381 | /* |
| 382 | * Wait for completion of a broadcast software ack message |
| 383 | * return COMPLETE, RETRY(PLUGGED or TIMEOUT) or GIVEUP |
| 384 | */ |
| 385 | static int uv_wait_completion(struct bau_desc *bau_desc, |
| 386 | unsigned long mmr_offset, int right_shift, int this_cpu, |
| 387 | struct bau_control *bcp, struct bau_control *smaster, long try) |
| 388 | { |
| 389 | int relaxes = 0; |
| 390 | unsigned long descriptor_status; |
| 391 | unsigned long mmr; |
| 392 | unsigned long mask; |
| 393 | cycles_t ttime; |
| 394 | cycles_t timeout_time; |
| 395 | struct ptc_stats *stat = &per_cpu(ptcstats, this_cpu); |
| 396 | struct bau_control *hmaster; |
| 397 | |
| 398 | hmaster = bcp->uvhub_master; |
| 399 | timeout_time = get_cycles() + bcp->timeout_interval; |
| 400 | |
| 401 | /* spin on the status MMR, waiting for it to go idle */ |
| 402 | while ((descriptor_status = (((unsigned long) |
| 403 | uv_read_local_mmr(mmr_offset) >> |
| 404 | right_shift) & UV_ACT_STATUS_MASK)) != |
| 405 | DESC_STATUS_IDLE) { |
| 406 | /* |
| 407 | * Our software ack messages may be blocked because there are |
| 408 | * no swack resources available. As long as none of them |
| 409 | * has timed out hardware will NACK our message and its |
| 410 | * state will stay IDLE. |
| 411 | */ |
| 412 | if (descriptor_status == DESC_STATUS_SOURCE_TIMEOUT) { |
| 413 | stat->s_stimeout++; |
| 414 | return FLUSH_GIVEUP; |
| 415 | } else if (descriptor_status == |
| 416 | DESC_STATUS_DESTINATION_TIMEOUT) { |
| 417 | stat->s_dtimeout++; |
| 418 | ttime = get_cycles(); |
| 419 | |
| 420 | /* |
| 421 | * Our retries may be blocked by all destination |
| 422 | * swack resources being consumed, and a timeout |
| 423 | * pending. In that case hardware returns the |
| 424 | * ERROR that looks like a destination timeout. |
| 425 | */ |
| 426 | if (cycles_2_us(ttime - bcp->send_message) < BIOS_TO) { |
| 427 | bcp->conseccompletes = 0; |
| 428 | return FLUSH_RETRY_PLUGGED; |
| 429 | } |
| 430 | |
| 431 | bcp->conseccompletes = 0; |
| 432 | return FLUSH_RETRY_TIMEOUT; |
| 433 | } else { |
| 434 | /* |
| 435 | * descriptor_status is still BUSY |
| 436 | */ |
| 437 | cpu_relax(); |
| 438 | relaxes++; |
| 439 | if (relaxes >= 10000) { |
| 440 | relaxes = 0; |
| 441 | if (get_cycles() > timeout_time) { |
| 442 | quiesce_local_uvhub(hmaster); |
| 443 | |
| 444 | /* single-thread the register change */ |
| 445 | spin_lock(&hmaster->masks_lock); |
| 446 | mmr = uv_read_local_mmr(mmr_offset); |
| 447 | mask = 0UL; |
| 448 | mask |= (3UL < right_shift); |
| 449 | mask = ~mask; |
| 450 | mmr &= mask; |
| 451 | uv_write_local_mmr(mmr_offset, mmr); |
| 452 | spin_unlock(&hmaster->masks_lock); |
| 453 | end_uvhub_quiesce(hmaster); |
| 454 | stat->s_busy++; |
| 455 | return FLUSH_GIVEUP; |
| 456 | } |
| 457 | } |
| 458 | } |
| 459 | } |
| 460 | bcp->conseccompletes++; |
| 461 | return FLUSH_COMPLETE; |
| 462 | } |
| 463 | |
| 464 | static inline cycles_t |
| 465 | sec_2_cycles(unsigned long sec) |
| 466 | { |
| 467 | unsigned long ns; |
| 468 | cycles_t cyc; |
| 469 | |
| 470 | ns = sec * 1000000000; |
| 471 | cyc = (ns << CYC2NS_SCALE_FACTOR)/(per_cpu(cyc2ns, smp_processor_id())); |
| 472 | return cyc; |
| 473 | } |
| 474 | |
| 475 | /* |
| 476 | * conditionally add 1 to *v, unless *v is >= u |
| 477 | * return 0 if we cannot add 1 to *v because it is >= u |
| 478 | * return 1 if we can add 1 to *v because it is < u |
| 479 | * the add is atomic |
| 480 | * |
| 481 | * This is close to atomic_add_unless(), but this allows the 'u' value |
| 482 | * to be lowered below the current 'v'. atomic_add_unless can only stop |
| 483 | * on equal. |
| 484 | */ |
| 485 | static inline int atomic_inc_unless_ge(spinlock_t *lock, atomic_t *v, int u) |
| 486 | { |
| 487 | spin_lock(lock); |
| 488 | if (atomic_read(v) >= u) { |
| 489 | spin_unlock(lock); |
| 490 | return 0; |
| 491 | } |
| 492 | atomic_inc(v); |
| 493 | spin_unlock(lock); |
| 494 | return 1; |
| 495 | } |
| 496 | |
| 497 | /** |
| 498 | * uv_flush_send_and_wait |
| 499 | * |
| 500 | * Send a broadcast and wait for it to complete. |
| 501 | * |
| 502 | * The flush_mask contains the cpus the broadcast is to be sent to, plus |
| 503 | * cpus that are on the local uvhub. |
| 504 | * |
| 505 | * Returns NULL if all flushing represented in the mask was done. The mask |
| 506 | * is zeroed. |
| 507 | * Returns @flush_mask if some remote flushing remains to be done. The |
| 508 | * mask will have some bits still set, representing any cpus on the local |
| 509 | * uvhub (not current cpu) and any on remote uvhubs if the broadcast failed. |
| 510 | */ |
| 511 | const struct cpumask *uv_flush_send_and_wait(struct bau_desc *bau_desc, |
| 512 | struct cpumask *flush_mask, |
| 513 | struct bau_control *bcp) |
| 514 | { |
| 515 | int right_shift; |
| 516 | int uvhub; |
| 517 | int bit; |
| 518 | int completion_status = 0; |
| 519 | int seq_number = 0; |
| 520 | long try = 0; |
| 521 | int cpu = bcp->uvhub_cpu; |
| 522 | int this_cpu = bcp->cpu; |
| 523 | int this_uvhub = bcp->uvhub; |
| 524 | unsigned long mmr_offset; |
| 525 | unsigned long index; |
| 526 | cycles_t time1; |
| 527 | cycles_t time2; |
| 528 | struct ptc_stats *stat = &per_cpu(ptcstats, bcp->cpu); |
| 529 | struct bau_control *smaster = bcp->socket_master; |
| 530 | struct bau_control *hmaster = bcp->uvhub_master; |
| 531 | |
| 532 | /* |
| 533 | * Spin here while there are hmaster->max_concurrent or more active |
| 534 | * descriptors. This is the per-uvhub 'throttle'. |
| 535 | */ |
| 536 | if (!atomic_inc_unless_ge(&hmaster->uvhub_lock, |
| 537 | &hmaster->active_descriptor_count, |
| 538 | hmaster->max_concurrent)) { |
| 539 | stat->s_throttles++; |
| 540 | do { |
| 541 | cpu_relax(); |
| 542 | } while (!atomic_inc_unless_ge(&hmaster->uvhub_lock, |
| 543 | &hmaster->active_descriptor_count, |
| 544 | hmaster->max_concurrent)); |
| 545 | } |
| 546 | |
| 547 | while (hmaster->uvhub_quiesce) |
| 548 | cpu_relax(); |
| 549 | |
| 550 | if (cpu < UV_CPUS_PER_ACT_STATUS) { |
| 551 | mmr_offset = UVH_LB_BAU_SB_ACTIVATION_STATUS_0; |
| 552 | right_shift = cpu * UV_ACT_STATUS_SIZE; |
| 553 | } else { |
| 554 | mmr_offset = UVH_LB_BAU_SB_ACTIVATION_STATUS_1; |
| 555 | right_shift = |
| 556 | ((cpu - UV_CPUS_PER_ACT_STATUS) * UV_ACT_STATUS_SIZE); |
| 557 | } |
| 558 | time1 = get_cycles(); |
| 559 | do { |
| 560 | /* |
| 561 | * Every message from any given cpu gets a unique message |
| 562 | * sequence number. But retries use that same number. |
| 563 | * Our message may have timed out at the destination because |
| 564 | * all sw-ack resources are in use and there is a timeout |
| 565 | * pending there. In that case, our last send never got |
| 566 | * placed into the queue and we need to persist until it |
| 567 | * does. |
| 568 | * |
| 569 | * Make any retry a type MSG_RETRY so that the destination will |
| 570 | * free any resource held by a previous message from this cpu. |
| 571 | */ |
| 572 | if (try == 0) { |
| 573 | /* use message type set by the caller the first time */ |
| 574 | seq_number = bcp->message_number++; |
| 575 | } else { |
| 576 | /* use RETRY type on all the rest; same sequence */ |
| 577 | bau_desc->header.msg_type = MSG_RETRY; |
| 578 | stat->s_retry_messages++; |
| 579 | } |
| 580 | bau_desc->header.sequence = seq_number; |
| 581 | index = (1UL << UVH_LB_BAU_SB_ACTIVATION_CONTROL_PUSH_SHFT) | |
| 582 | bcp->uvhub_cpu; |
| 583 | bcp->send_message = get_cycles(); |
| 584 | |
| 585 | uv_write_local_mmr(UVH_LB_BAU_SB_ACTIVATION_CONTROL, index); |
| 586 | |
| 587 | try++; |
| 588 | completion_status = uv_wait_completion(bau_desc, mmr_offset, |
| 589 | right_shift, this_cpu, bcp, smaster, try); |
| 590 | |
| 591 | if (completion_status == FLUSH_RETRY_PLUGGED) { |
| 592 | /* |
| 593 | * Our retries may be blocked by all destination swack |
| 594 | * resources being consumed, and a timeout pending. In |
| 595 | * that case hardware immediately returns the ERROR |
| 596 | * that looks like a destination timeout. |
| 597 | */ |
| 598 | udelay(TIMEOUT_DELAY); |
| 599 | bcp->plugged_tries++; |
| 600 | if (bcp->plugged_tries >= PLUGSB4RESET) { |
| 601 | bcp->plugged_tries = 0; |
| 602 | quiesce_local_uvhub(hmaster); |
| 603 | spin_lock(&hmaster->queue_lock); |
| 604 | uv_reset_with_ipi(&bau_desc->distribution, |
| 605 | this_cpu); |
| 606 | spin_unlock(&hmaster->queue_lock); |
| 607 | end_uvhub_quiesce(hmaster); |
| 608 | bcp->ipi_attempts++; |
| 609 | stat->s_resets_plug++; |
| 610 | } |
| 611 | } else if (completion_status == FLUSH_RETRY_TIMEOUT) { |
| 612 | hmaster->max_concurrent = 1; |
| 613 | bcp->timeout_tries++; |
| 614 | udelay(TIMEOUT_DELAY); |
| 615 | if (bcp->timeout_tries >= TIMEOUTSB4RESET) { |
| 616 | bcp->timeout_tries = 0; |
| 617 | quiesce_local_uvhub(hmaster); |
| 618 | spin_lock(&hmaster->queue_lock); |
| 619 | uv_reset_with_ipi(&bau_desc->distribution, |
| 620 | this_cpu); |
| 621 | spin_unlock(&hmaster->queue_lock); |
| 622 | end_uvhub_quiesce(hmaster); |
| 623 | bcp->ipi_attempts++; |
| 624 | stat->s_resets_timeout++; |
| 625 | } |
| 626 | } |
| 627 | if (bcp->ipi_attempts >= 3) { |
| 628 | bcp->ipi_attempts = 0; |
| 629 | completion_status = FLUSH_GIVEUP; |
| 630 | break; |
| 631 | } |
| 632 | cpu_relax(); |
| 633 | } while ((completion_status == FLUSH_RETRY_PLUGGED) || |
| 634 | (completion_status == FLUSH_RETRY_TIMEOUT)); |
| 635 | time2 = get_cycles(); |
| 636 | |
| 637 | if ((completion_status == FLUSH_COMPLETE) && (bcp->conseccompletes > 5) |
| 638 | && (hmaster->max_concurrent < hmaster->max_concurrent_constant)) |
| 639 | hmaster->max_concurrent++; |
| 640 | |
| 641 | /* |
| 642 | * hold any cpu not timing out here; no other cpu currently held by |
| 643 | * the 'throttle' should enter the activation code |
| 644 | */ |
| 645 | while (hmaster->uvhub_quiesce) |
| 646 | cpu_relax(); |
| 647 | atomic_dec(&hmaster->active_descriptor_count); |
| 648 | |
| 649 | /* guard against cycles wrap */ |
| 650 | if (time2 > time1) |
| 651 | stat->s_time += (time2 - time1); |
| 652 | else |
| 653 | stat->s_requestor--; /* don't count this one */ |
| 654 | if (completion_status == FLUSH_COMPLETE && try > 1) |
| 655 | stat->s_retriesok++; |
| 656 | else if (completion_status == FLUSH_GIVEUP) { |
| 657 | /* |
| 658 | * Cause the caller to do an IPI-style TLB shootdown on |
| 659 | * the target cpu's, all of which are still in the mask. |
| 660 | */ |
| 661 | stat->s_giveup++; |
| 662 | return flush_mask; |
| 663 | } |
| 664 | |
| 665 | /* |
| 666 | * Success, so clear the remote cpu's from the mask so we don't |
| 667 | * use the IPI method of shootdown on them. |
| 668 | */ |
| 669 | for_each_cpu(bit, flush_mask) { |
| 670 | uvhub = uv_cpu_to_blade_id(bit); |
| 671 | if (uvhub == this_uvhub) |
| 672 | continue; |
| 673 | cpumask_clear_cpu(bit, flush_mask); |
| 674 | } |
| 675 | if (!cpumask_empty(flush_mask)) |
| 676 | return flush_mask; |
| 677 | |
| 678 | return NULL; |
| 679 | } |
| 680 | |
| 681 | /** |
| 682 | * uv_flush_tlb_others - globally purge translation cache of a virtual |
| 683 | * address or all TLB's |
| 684 | * @cpumask: mask of all cpu's in which the address is to be removed |
| 685 | * @mm: mm_struct containing virtual address range |
| 686 | * @va: virtual address to be removed (or TLB_FLUSH_ALL for all TLB's on cpu) |
| 687 | * @cpu: the current cpu |
| 688 | * |
| 689 | * This is the entry point for initiating any UV global TLB shootdown. |
| 690 | * |
| 691 | * Purges the translation caches of all specified processors of the given |
| 692 | * virtual address, or purges all TLB's on specified processors. |
| 693 | * |
| 694 | * The caller has derived the cpumask from the mm_struct. This function |
| 695 | * is called only if there are bits set in the mask. (e.g. flush_tlb_page()) |
| 696 | * |
| 697 | * The cpumask is converted into a uvhubmask of the uvhubs containing |
| 698 | * those cpus. |
| 699 | * |
| 700 | * Note that this function should be called with preemption disabled. |
| 701 | * |
| 702 | * Returns NULL if all remote flushing was done. |
| 703 | * Returns pointer to cpumask if some remote flushing remains to be |
| 704 | * done. The returned pointer is valid till preemption is re-enabled. |
| 705 | */ |
| 706 | const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask, |
| 707 | struct mm_struct *mm, |
| 708 | unsigned long va, unsigned int cpu) |
| 709 | { |
| 710 | int remotes; |
| 711 | int tcpu; |
| 712 | int uvhub; |
| 713 | int locals = 0; |
| 714 | struct bau_desc *bau_desc; |
| 715 | struct cpumask *flush_mask; |
| 716 | struct ptc_stats *stat; |
| 717 | struct bau_control *bcp; |
| 718 | |
| 719 | if (nobau) |
| 720 | return cpumask; |
| 721 | |
| 722 | bcp = &per_cpu(bau_control, cpu); |
| 723 | /* |
| 724 | * Each sending cpu has a per-cpu mask which it fills from the caller's |
| 725 | * cpu mask. Only remote cpus are converted to uvhubs and copied. |
| 726 | */ |
| 727 | flush_mask = (struct cpumask *)per_cpu(uv_flush_tlb_mask, cpu); |
| 728 | /* |
| 729 | * copy cpumask to flush_mask, removing current cpu |
| 730 | * (current cpu should already have been flushed by the caller and |
| 731 | * should never be returned if we return flush_mask) |
| 732 | */ |
| 733 | cpumask_andnot(flush_mask, cpumask, cpumask_of(cpu)); |
| 734 | if (cpu_isset(cpu, *cpumask)) |
| 735 | locals++; /* current cpu was targeted */ |
| 736 | |
| 737 | bau_desc = bcp->descriptor_base; |
| 738 | bau_desc += UV_ITEMS_PER_DESCRIPTOR * bcp->uvhub_cpu; |
| 739 | |
| 740 | bau_uvhubs_clear(&bau_desc->distribution, UV_DISTRIBUTION_SIZE); |
| 741 | remotes = 0; |
| 742 | for_each_cpu(tcpu, flush_mask) { |
| 743 | uvhub = uv_cpu_to_blade_id(tcpu); |
| 744 | if (uvhub == bcp->uvhub) { |
| 745 | locals++; |
| 746 | continue; |
| 747 | } |
| 748 | bau_uvhub_set(uvhub, &bau_desc->distribution); |
| 749 | remotes++; |
| 750 | } |
| 751 | if (remotes == 0) { |
| 752 | /* |
| 753 | * No off_hub flushing; return status for local hub. |
| 754 | * Return the caller's mask if all were local (the current |
| 755 | * cpu may be in that mask). |
| 756 | */ |
| 757 | if (locals) |
| 758 | return cpumask; |
| 759 | else |
| 760 | return NULL; |
| 761 | } |
| 762 | stat = &per_cpu(ptcstats, cpu); |
| 763 | stat->s_requestor++; |
| 764 | stat->s_ntargcpu += remotes; |
| 765 | remotes = bau_uvhub_weight(&bau_desc->distribution); |
| 766 | stat->s_ntarguvhub += remotes; |
| 767 | if (remotes >= 16) |
| 768 | stat->s_ntarguvhub16++; |
| 769 | else if (remotes >= 8) |
| 770 | stat->s_ntarguvhub8++; |
| 771 | else if (remotes >= 4) |
| 772 | stat->s_ntarguvhub4++; |
| 773 | else if (remotes >= 2) |
| 774 | stat->s_ntarguvhub2++; |
| 775 | else |
| 776 | stat->s_ntarguvhub1++; |
| 777 | |
| 778 | bau_desc->payload.address = va; |
| 779 | bau_desc->payload.sending_cpu = cpu; |
| 780 | |
| 781 | /* |
| 782 | * uv_flush_send_and_wait returns null if all cpu's were messaged, or |
| 783 | * the adjusted flush_mask if any cpu's were not messaged. |
| 784 | */ |
| 785 | return uv_flush_send_and_wait(bau_desc, flush_mask, bcp); |
| 786 | } |
| 787 | |
| 788 | /* |
| 789 | * The BAU message interrupt comes here. (registered by set_intr_gate) |
| 790 | * See entry_64.S |
| 791 | * |
| 792 | * We received a broadcast assist message. |
| 793 | * |
| 794 | * Interrupts are disabled; this interrupt could represent |
| 795 | * the receipt of several messages. |
| 796 | * |
| 797 | * All cores/threads on this hub get this interrupt. |
| 798 | * The last one to see it does the software ack. |
| 799 | * (the resource will not be freed until noninterruptable cpus see this |
| 800 | * interrupt; hardware may timeout the s/w ack and reply ERROR) |
| 801 | */ |
| 802 | void uv_bau_message_interrupt(struct pt_regs *regs) |
| 803 | { |
| 804 | int count = 0; |
| 805 | cycles_t time_start; |
| 806 | struct bau_payload_queue_entry *msg; |
| 807 | struct bau_control *bcp; |
| 808 | struct ptc_stats *stat; |
| 809 | struct msg_desc msgdesc; |
| 810 | |
| 811 | time_start = get_cycles(); |
| 812 | bcp = &per_cpu(bau_control, smp_processor_id()); |
| 813 | stat = &per_cpu(ptcstats, smp_processor_id()); |
| 814 | msgdesc.va_queue_first = bcp->va_queue_first; |
| 815 | msgdesc.va_queue_last = bcp->va_queue_last; |
| 816 | msg = bcp->bau_msg_head; |
| 817 | while (msg->sw_ack_vector) { |
| 818 | count++; |
| 819 | msgdesc.msg_slot = msg - msgdesc.va_queue_first; |
| 820 | msgdesc.sw_ack_slot = ffs(msg->sw_ack_vector) - 1; |
| 821 | msgdesc.msg = msg; |
| 822 | uv_bau_process_message(&msgdesc, bcp); |
| 823 | msg++; |
| 824 | if (msg > msgdesc.va_queue_last) |
| 825 | msg = msgdesc.va_queue_first; |
| 826 | bcp->bau_msg_head = msg; |
| 827 | } |
| 828 | stat->d_time += (get_cycles() - time_start); |
| 829 | if (!count) |
| 830 | stat->d_nomsg++; |
| 831 | else if (count > 1) |
| 832 | stat->d_multmsg++; |
| 833 | ack_APIC_irq(); |
| 834 | } |
| 835 | |
| 836 | /* |
| 837 | * uv_enable_timeouts |
| 838 | * |
| 839 | * Each target uvhub (i.e. a uvhub that has no cpu's) needs to have |
| 840 | * shootdown message timeouts enabled. The timeout does not cause |
| 841 | * an interrupt, but causes an error message to be returned to |
| 842 | * the sender. |
| 843 | */ |
| 844 | static void uv_enable_timeouts(void) |
| 845 | { |
| 846 | int uvhub; |
| 847 | int nuvhubs; |
| 848 | int pnode; |
| 849 | unsigned long mmr_image; |
| 850 | |
| 851 | nuvhubs = uv_num_possible_blades(); |
| 852 | |
| 853 | for (uvhub = 0; uvhub < nuvhubs; uvhub++) { |
| 854 | if (!uv_blade_nr_possible_cpus(uvhub)) |
| 855 | continue; |
| 856 | |
| 857 | pnode = uv_blade_to_pnode(uvhub); |
| 858 | mmr_image = |
| 859 | uv_read_global_mmr64(pnode, UVH_LB_BAU_MISC_CONTROL); |
| 860 | /* |
| 861 | * Set the timeout period and then lock it in, in three |
| 862 | * steps; captures and locks in the period. |
| 863 | * |
| 864 | * To program the period, the SOFT_ACK_MODE must be off. |
| 865 | */ |
| 866 | mmr_image &= ~((unsigned long)1 << |
| 867 | UVH_LB_BAU_MISC_CONTROL_ENABLE_INTD_SOFT_ACK_MODE_SHFT); |
| 868 | uv_write_global_mmr64 |
| 869 | (pnode, UVH_LB_BAU_MISC_CONTROL, mmr_image); |
| 870 | /* |
| 871 | * Set the 4-bit period. |
| 872 | */ |
| 873 | mmr_image &= ~((unsigned long)0xf << |
| 874 | UVH_LB_BAU_MISC_CONTROL_INTD_SOFT_ACK_TIMEOUT_PERIOD_SHFT); |
| 875 | mmr_image |= (UV_INTD_SOFT_ACK_TIMEOUT_PERIOD << |
| 876 | UVH_LB_BAU_MISC_CONTROL_INTD_SOFT_ACK_TIMEOUT_PERIOD_SHFT); |
| 877 | uv_write_global_mmr64 |
| 878 | (pnode, UVH_LB_BAU_MISC_CONTROL, mmr_image); |
| 879 | /* |
| 880 | * Subsequent reversals of the timebase bit (3) cause an |
| 881 | * immediate timeout of one or all INTD resources as |
| 882 | * indicated in bits 2:0 (7 causes all of them to timeout). |
| 883 | */ |
| 884 | mmr_image |= ((unsigned long)1 << |
| 885 | UVH_LB_BAU_MISC_CONTROL_ENABLE_INTD_SOFT_ACK_MODE_SHFT); |
| 886 | uv_write_global_mmr64 |
| 887 | (pnode, UVH_LB_BAU_MISC_CONTROL, mmr_image); |
| 888 | } |
| 889 | } |
| 890 | |
| 891 | static void *uv_ptc_seq_start(struct seq_file *file, loff_t *offset) |
| 892 | { |
| 893 | if (*offset < num_possible_cpus()) |
| 894 | return offset; |
| 895 | return NULL; |
| 896 | } |
| 897 | |
| 898 | static void *uv_ptc_seq_next(struct seq_file *file, void *data, loff_t *offset) |
| 899 | { |
| 900 | (*offset)++; |
| 901 | if (*offset < num_possible_cpus()) |
| 902 | return offset; |
| 903 | return NULL; |
| 904 | } |
| 905 | |
| 906 | static void uv_ptc_seq_stop(struct seq_file *file, void *data) |
| 907 | { |
| 908 | } |
| 909 | |
| 910 | static inline unsigned long long |
| 911 | millisec_2_cycles(unsigned long millisec) |
| 912 | { |
| 913 | unsigned long ns; |
| 914 | unsigned long long cyc; |
| 915 | |
| 916 | ns = millisec * 1000; |
| 917 | cyc = (ns << CYC2NS_SCALE_FACTOR)/(per_cpu(cyc2ns, smp_processor_id())); |
| 918 | return cyc; |
| 919 | } |
| 920 | |
| 921 | /* |
| 922 | * Display the statistics thru /proc. |
| 923 | * 'data' points to the cpu number |
| 924 | */ |
| 925 | static int uv_ptc_seq_show(struct seq_file *file, void *data) |
| 926 | { |
| 927 | struct ptc_stats *stat; |
| 928 | int cpu; |
| 929 | |
| 930 | cpu = *(loff_t *)data; |
| 931 | |
| 932 | if (!cpu) { |
| 933 | seq_printf(file, |
| 934 | "# cpu sent stime numuvhubs numuvhubs16 numuvhubs8 "); |
| 935 | seq_printf(file, |
| 936 | "numuvhubs4 numuvhubs2 numuvhubs1 numcpus dto "); |
| 937 | seq_printf(file, |
| 938 | "retries rok resetp resett giveup sto bz throt "); |
| 939 | seq_printf(file, |
| 940 | "sw_ack recv rtime all "); |
| 941 | seq_printf(file, |
| 942 | "one mult none retry canc nocan reset rcan\n"); |
| 943 | } |
| 944 | if (cpu < num_possible_cpus() && cpu_online(cpu)) { |
| 945 | stat = &per_cpu(ptcstats, cpu); |
| 946 | /* source side statistics */ |
| 947 | seq_printf(file, |
| 948 | "cpu %d %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld ", |
| 949 | cpu, stat->s_requestor, cycles_2_us(stat->s_time), |
| 950 | stat->s_ntarguvhub, stat->s_ntarguvhub16, |
| 951 | stat->s_ntarguvhub8, stat->s_ntarguvhub4, |
| 952 | stat->s_ntarguvhub2, stat->s_ntarguvhub1, |
| 953 | stat->s_ntargcpu, stat->s_dtimeout); |
| 954 | seq_printf(file, "%ld %ld %ld %ld %ld %ld %ld %ld ", |
| 955 | stat->s_retry_messages, stat->s_retriesok, |
| 956 | stat->s_resets_plug, stat->s_resets_timeout, |
| 957 | stat->s_giveup, stat->s_stimeout, |
| 958 | stat->s_busy, stat->s_throttles); |
| 959 | /* destination side statistics */ |
| 960 | seq_printf(file, |
| 961 | "%lx %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld\n", |
| 962 | uv_read_global_mmr64(uv_cpu_to_pnode(cpu), |
| 963 | UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE), |
| 964 | stat->d_requestee, cycles_2_us(stat->d_time), |
| 965 | stat->d_alltlb, stat->d_onetlb, stat->d_multmsg, |
| 966 | stat->d_nomsg, stat->d_retries, stat->d_canceled, |
| 967 | stat->d_nocanceled, stat->d_resets, |
| 968 | stat->d_rcanceled); |
| 969 | } |
| 970 | |
| 971 | return 0; |
| 972 | } |
| 973 | |
| 974 | /* |
| 975 | * -1: resetf the statistics |
| 976 | * 0: display meaning of the statistics |
| 977 | * >0: maximum concurrent active descriptors per uvhub (throttle) |
| 978 | */ |
| 979 | static ssize_t uv_ptc_proc_write(struct file *file, const char __user *user, |
| 980 | size_t count, loff_t *data) |
| 981 | { |
| 982 | int cpu; |
| 983 | long input_arg; |
| 984 | char optstr[64]; |
| 985 | struct ptc_stats *stat; |
| 986 | struct bau_control *bcp; |
| 987 | |
| 988 | if (count == 0 || count > sizeof(optstr)) |
| 989 | return -EINVAL; |
| 990 | if (copy_from_user(optstr, user, count)) |
| 991 | return -EFAULT; |
| 992 | optstr[count - 1] = '\0'; |
| 993 | if (strict_strtol(optstr, 10, &input_arg) < 0) { |
| 994 | printk(KERN_DEBUG "%s is invalid\n", optstr); |
| 995 | return -EINVAL; |
| 996 | } |
| 997 | |
| 998 | if (input_arg == 0) { |
| 999 | printk(KERN_DEBUG "# cpu: cpu number\n"); |
| 1000 | printk(KERN_DEBUG "Sender statistics:\n"); |
| 1001 | printk(KERN_DEBUG |
| 1002 | "sent: number of shootdown messages sent\n"); |
| 1003 | printk(KERN_DEBUG |
| 1004 | "stime: time spent sending messages\n"); |
| 1005 | printk(KERN_DEBUG |
| 1006 | "numuvhubs: number of hubs targeted with shootdown\n"); |
| 1007 | printk(KERN_DEBUG |
| 1008 | "numuvhubs16: number times 16 or more hubs targeted\n"); |
| 1009 | printk(KERN_DEBUG |
| 1010 | "numuvhubs8: number times 8 or more hubs targeted\n"); |
| 1011 | printk(KERN_DEBUG |
| 1012 | "numuvhubs4: number times 4 or more hubs targeted\n"); |
| 1013 | printk(KERN_DEBUG |
| 1014 | "numuvhubs2: number times 2 or more hubs targeted\n"); |
| 1015 | printk(KERN_DEBUG |
| 1016 | "numuvhubs1: number times 1 hub targeted\n"); |
| 1017 | printk(KERN_DEBUG |
| 1018 | "numcpus: number of cpus targeted with shootdown\n"); |
| 1019 | printk(KERN_DEBUG |
| 1020 | "dto: number of destination timeouts\n"); |
| 1021 | printk(KERN_DEBUG |
| 1022 | "retries: destination timeout retries sent\n"); |
| 1023 | printk(KERN_DEBUG |
| 1024 | "rok: : destination timeouts successfully retried\n"); |
| 1025 | printk(KERN_DEBUG |
| 1026 | "resetp: ipi-style resource resets for plugs\n"); |
| 1027 | printk(KERN_DEBUG |
| 1028 | "resett: ipi-style resource resets for timeouts\n"); |
| 1029 | printk(KERN_DEBUG |
| 1030 | "giveup: fall-backs to ipi-style shootdowns\n"); |
| 1031 | printk(KERN_DEBUG |
| 1032 | "sto: number of source timeouts\n"); |
| 1033 | printk(KERN_DEBUG |
| 1034 | "bz: number of stay-busy's\n"); |
| 1035 | printk(KERN_DEBUG |
| 1036 | "throt: number times spun in throttle\n"); |
| 1037 | printk(KERN_DEBUG "Destination side statistics:\n"); |
| 1038 | printk(KERN_DEBUG |
| 1039 | "sw_ack: image of UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE\n"); |
| 1040 | printk(KERN_DEBUG |
| 1041 | "recv: shootdown messages received\n"); |
| 1042 | printk(KERN_DEBUG |
| 1043 | "rtime: time spent processing messages\n"); |
| 1044 | printk(KERN_DEBUG |
| 1045 | "all: shootdown all-tlb messages\n"); |
| 1046 | printk(KERN_DEBUG |
| 1047 | "one: shootdown one-tlb messages\n"); |
| 1048 | printk(KERN_DEBUG |
| 1049 | "mult: interrupts that found multiple messages\n"); |
| 1050 | printk(KERN_DEBUG |
| 1051 | "none: interrupts that found no messages\n"); |
| 1052 | printk(KERN_DEBUG |
| 1053 | "retry: number of retry messages processed\n"); |
| 1054 | printk(KERN_DEBUG |
| 1055 | "canc: number messages canceled by retries\n"); |
| 1056 | printk(KERN_DEBUG |
| 1057 | "nocan: number retries that found nothing to cancel\n"); |
| 1058 | printk(KERN_DEBUG |
| 1059 | "reset: number of ipi-style reset requests processed\n"); |
| 1060 | printk(KERN_DEBUG |
| 1061 | "rcan: number messages canceled by reset requests\n"); |
| 1062 | } else if (input_arg == -1) { |
| 1063 | for_each_present_cpu(cpu) { |
| 1064 | stat = &per_cpu(ptcstats, cpu); |
| 1065 | memset(stat, 0, sizeof(struct ptc_stats)); |
| 1066 | } |
| 1067 | } else { |
| 1068 | uv_bau_max_concurrent = input_arg; |
| 1069 | bcp = &per_cpu(bau_control, smp_processor_id()); |
| 1070 | if (uv_bau_max_concurrent < 1 || |
| 1071 | uv_bau_max_concurrent > bcp->cpus_in_uvhub) { |
| 1072 | printk(KERN_DEBUG |
| 1073 | "Error: BAU max concurrent %d; %d is invalid\n", |
| 1074 | bcp->max_concurrent, uv_bau_max_concurrent); |
| 1075 | return -EINVAL; |
| 1076 | } |
| 1077 | printk(KERN_DEBUG "Set BAU max concurrent:%d\n", |
| 1078 | uv_bau_max_concurrent); |
| 1079 | for_each_present_cpu(cpu) { |
| 1080 | bcp = &per_cpu(bau_control, cpu); |
| 1081 | bcp->max_concurrent = uv_bau_max_concurrent; |
| 1082 | } |
| 1083 | } |
| 1084 | |
| 1085 | return count; |
| 1086 | } |
| 1087 | |
| 1088 | static const struct seq_operations uv_ptc_seq_ops = { |
| 1089 | .start = uv_ptc_seq_start, |
| 1090 | .next = uv_ptc_seq_next, |
| 1091 | .stop = uv_ptc_seq_stop, |
| 1092 | .show = uv_ptc_seq_show |
| 1093 | }; |
| 1094 | |
| 1095 | static int uv_ptc_proc_open(struct inode *inode, struct file *file) |
| 1096 | { |
| 1097 | return seq_open(file, &uv_ptc_seq_ops); |
| 1098 | } |
| 1099 | |
| 1100 | static const struct file_operations proc_uv_ptc_operations = { |
| 1101 | .open = uv_ptc_proc_open, |
| 1102 | .read = seq_read, |
| 1103 | .write = uv_ptc_proc_write, |
| 1104 | .llseek = seq_lseek, |
| 1105 | .release = seq_release, |
| 1106 | }; |
| 1107 | |
| 1108 | static int __init uv_ptc_init(void) |
| 1109 | { |
| 1110 | struct proc_dir_entry *proc_uv_ptc; |
| 1111 | |
| 1112 | if (!is_uv_system()) |
| 1113 | return 0; |
| 1114 | |
| 1115 | proc_uv_ptc = proc_create(UV_PTC_BASENAME, 0444, NULL, |
| 1116 | &proc_uv_ptc_operations); |
| 1117 | if (!proc_uv_ptc) { |
| 1118 | printk(KERN_ERR "unable to create %s proc entry\n", |
| 1119 | UV_PTC_BASENAME); |
| 1120 | return -EINVAL; |
| 1121 | } |
| 1122 | return 0; |
| 1123 | } |
| 1124 | |
| 1125 | /* |
| 1126 | * initialize the sending side's sending buffers |
| 1127 | */ |
| 1128 | static void |
| 1129 | uv_activation_descriptor_init(int node, int pnode) |
| 1130 | { |
| 1131 | int i; |
| 1132 | int cpu; |
| 1133 | unsigned long pa; |
| 1134 | unsigned long m; |
| 1135 | unsigned long n; |
| 1136 | struct bau_desc *bau_desc; |
| 1137 | struct bau_desc *bd2; |
| 1138 | struct bau_control *bcp; |
| 1139 | |
| 1140 | /* |
| 1141 | * each bau_desc is 64 bytes; there are 8 (UV_ITEMS_PER_DESCRIPTOR) |
| 1142 | * per cpu; and up to 32 (UV_ADP_SIZE) cpu's per uvhub |
| 1143 | */ |
| 1144 | bau_desc = (struct bau_desc *)kmalloc_node(sizeof(struct bau_desc)* |
| 1145 | UV_ADP_SIZE*UV_ITEMS_PER_DESCRIPTOR, GFP_KERNEL, node); |
| 1146 | BUG_ON(!bau_desc); |
| 1147 | |
| 1148 | pa = uv_gpa(bau_desc); /* need the real nasid*/ |
| 1149 | n = pa >> uv_nshift; |
| 1150 | m = pa & uv_mmask; |
| 1151 | |
| 1152 | uv_write_global_mmr64(pnode, UVH_LB_BAU_SB_DESCRIPTOR_BASE, |
| 1153 | (n << UV_DESC_BASE_PNODE_SHIFT | m)); |
| 1154 | |
| 1155 | /* |
| 1156 | * initializing all 8 (UV_ITEMS_PER_DESCRIPTOR) descriptors for each |
| 1157 | * cpu even though we only use the first one; one descriptor can |
| 1158 | * describe a broadcast to 256 uv hubs. |
| 1159 | */ |
| 1160 | for (i = 0, bd2 = bau_desc; i < (UV_ADP_SIZE*UV_ITEMS_PER_DESCRIPTOR); |
| 1161 | i++, bd2++) { |
| 1162 | memset(bd2, 0, sizeof(struct bau_desc)); |
| 1163 | bd2->header.sw_ack_flag = 1; |
| 1164 | /* |
| 1165 | * base_dest_nodeid is the nasid (pnode<<1) of the first uvhub |
| 1166 | * in the partition. The bit map will indicate uvhub numbers, |
| 1167 | * which are 0-N in a partition. Pnodes are unique system-wide. |
| 1168 | */ |
| 1169 | bd2->header.base_dest_nodeid = uv_partition_base_pnode << 1; |
| 1170 | bd2->header.dest_subnodeid = 0x10; /* the LB */ |
| 1171 | bd2->header.command = UV_NET_ENDPOINT_INTD; |
| 1172 | bd2->header.int_both = 1; |
| 1173 | /* |
| 1174 | * all others need to be set to zero: |
| 1175 | * fairness chaining multilevel count replied_to |
| 1176 | */ |
| 1177 | } |
| 1178 | for_each_present_cpu(cpu) { |
| 1179 | if (pnode != uv_blade_to_pnode(uv_cpu_to_blade_id(cpu))) |
| 1180 | continue; |
| 1181 | bcp = &per_cpu(bau_control, cpu); |
| 1182 | bcp->descriptor_base = bau_desc; |
| 1183 | } |
| 1184 | } |
| 1185 | |
| 1186 | /* |
| 1187 | * initialize the destination side's receiving buffers |
| 1188 | * entered for each uvhub in the partition |
| 1189 | * - node is first node (kernel memory notion) on the uvhub |
| 1190 | * - pnode is the uvhub's physical identifier |
| 1191 | */ |
| 1192 | static void |
| 1193 | uv_payload_queue_init(int node, int pnode) |
| 1194 | { |
| 1195 | int pn; |
| 1196 | int cpu; |
| 1197 | char *cp; |
| 1198 | unsigned long pa; |
| 1199 | struct bau_payload_queue_entry *pqp; |
| 1200 | struct bau_payload_queue_entry *pqp_malloc; |
| 1201 | struct bau_control *bcp; |
| 1202 | |
| 1203 | pqp = (struct bau_payload_queue_entry *) kmalloc_node( |
| 1204 | (DEST_Q_SIZE + 1) * sizeof(struct bau_payload_queue_entry), |
| 1205 | GFP_KERNEL, node); |
| 1206 | BUG_ON(!pqp); |
| 1207 | pqp_malloc = pqp; |
| 1208 | |
| 1209 | cp = (char *)pqp + 31; |
| 1210 | pqp = (struct bau_payload_queue_entry *)(((unsigned long)cp >> 5) << 5); |
| 1211 | |
| 1212 | for_each_present_cpu(cpu) { |
| 1213 | if (pnode != uv_cpu_to_pnode(cpu)) |
| 1214 | continue; |
| 1215 | /* for every cpu on this pnode: */ |
| 1216 | bcp = &per_cpu(bau_control, cpu); |
| 1217 | bcp->va_queue_first = pqp; |
| 1218 | bcp->bau_msg_head = pqp; |
| 1219 | bcp->va_queue_last = pqp + (DEST_Q_SIZE - 1); |
| 1220 | } |
| 1221 | /* |
| 1222 | * need the pnode of where the memory was really allocated |
| 1223 | */ |
| 1224 | pa = uv_gpa(pqp); |
| 1225 | pn = pa >> uv_nshift; |
| 1226 | uv_write_global_mmr64(pnode, |
| 1227 | UVH_LB_BAU_INTD_PAYLOAD_QUEUE_FIRST, |
| 1228 | ((unsigned long)pn << UV_PAYLOADQ_PNODE_SHIFT) | |
| 1229 | uv_physnodeaddr(pqp)); |
| 1230 | uv_write_global_mmr64(pnode, UVH_LB_BAU_INTD_PAYLOAD_QUEUE_TAIL, |
| 1231 | uv_physnodeaddr(pqp)); |
| 1232 | uv_write_global_mmr64(pnode, UVH_LB_BAU_INTD_PAYLOAD_QUEUE_LAST, |
| 1233 | (unsigned long) |
| 1234 | uv_physnodeaddr(pqp + (DEST_Q_SIZE - 1))); |
| 1235 | /* in effect, all msg_type's are set to MSG_NOOP */ |
| 1236 | memset(pqp, 0, sizeof(struct bau_payload_queue_entry) * DEST_Q_SIZE); |
| 1237 | } |
| 1238 | |
| 1239 | /* |
| 1240 | * Initialization of each UV hub's structures |
| 1241 | */ |
| 1242 | static void __init uv_init_uvhub(int uvhub, int vector) |
| 1243 | { |
| 1244 | int node; |
| 1245 | int pnode; |
| 1246 | unsigned long apicid; |
| 1247 | |
| 1248 | node = uvhub_to_first_node(uvhub); |
| 1249 | pnode = uv_blade_to_pnode(uvhub); |
| 1250 | uv_activation_descriptor_init(node, pnode); |
| 1251 | uv_payload_queue_init(node, pnode); |
| 1252 | /* |
| 1253 | * the below initialization can't be in firmware because the |
| 1254 | * messaging IRQ will be determined by the OS |
| 1255 | */ |
| 1256 | apicid = uvhub_to_first_apicid(uvhub); |
| 1257 | uv_write_global_mmr64(pnode, UVH_BAU_DATA_CONFIG, |
| 1258 | ((apicid << 32) | vector)); |
| 1259 | } |
| 1260 | |
| 1261 | /* |
| 1262 | * initialize the bau_control structure for each cpu |
| 1263 | */ |
| 1264 | static void uv_init_per_cpu(int nuvhubs) |
| 1265 | { |
| 1266 | int i, j, k; |
| 1267 | int cpu; |
| 1268 | int pnode; |
| 1269 | int uvhub; |
| 1270 | short socket = 0; |
| 1271 | struct bau_control *bcp; |
| 1272 | struct uvhub_desc *bdp; |
| 1273 | struct socket_desc *sdp; |
| 1274 | struct bau_control *hmaster = NULL; |
| 1275 | struct bau_control *smaster = NULL; |
| 1276 | struct socket_desc { |
| 1277 | short num_cpus; |
| 1278 | short cpu_number[16]; |
| 1279 | }; |
| 1280 | struct uvhub_desc { |
| 1281 | short num_sockets; |
| 1282 | short num_cpus; |
| 1283 | short uvhub; |
| 1284 | short pnode; |
| 1285 | struct socket_desc socket[2]; |
| 1286 | }; |
| 1287 | struct uvhub_desc *uvhub_descs; |
| 1288 | |
| 1289 | uvhub_descs = (struct uvhub_desc *) |
| 1290 | kmalloc(nuvhubs * sizeof(struct uvhub_desc), GFP_KERNEL); |
| 1291 | memset(uvhub_descs, 0, nuvhubs * sizeof(struct uvhub_desc)); |
| 1292 | for_each_present_cpu(cpu) { |
| 1293 | bcp = &per_cpu(bau_control, cpu); |
| 1294 | memset(bcp, 0, sizeof(struct bau_control)); |
| 1295 | spin_lock_init(&bcp->masks_lock); |
| 1296 | bcp->max_concurrent = uv_bau_max_concurrent; |
| 1297 | pnode = uv_cpu_hub_info(cpu)->pnode; |
| 1298 | uvhub = uv_cpu_hub_info(cpu)->numa_blade_id; |
| 1299 | bdp = &uvhub_descs[uvhub]; |
| 1300 | bdp->num_cpus++; |
| 1301 | bdp->uvhub = uvhub; |
| 1302 | bdp->pnode = pnode; |
| 1303 | /* time interval to catch a hardware stay-busy bug */ |
| 1304 | bcp->timeout_interval = millisec_2_cycles(3); |
| 1305 | /* kludge: assume uv_hub.h is constant */ |
| 1306 | socket = (cpu_physical_id(cpu)>>5)&1; |
| 1307 | if (socket >= bdp->num_sockets) |
| 1308 | bdp->num_sockets = socket+1; |
| 1309 | sdp = &bdp->socket[socket]; |
| 1310 | sdp->cpu_number[sdp->num_cpus] = cpu; |
| 1311 | sdp->num_cpus++; |
| 1312 | } |
| 1313 | socket = 0; |
| 1314 | for_each_possible_blade(uvhub) { |
| 1315 | bdp = &uvhub_descs[uvhub]; |
| 1316 | for (i = 0; i < bdp->num_sockets; i++) { |
| 1317 | sdp = &bdp->socket[i]; |
| 1318 | for (j = 0; j < sdp->num_cpus; j++) { |
| 1319 | cpu = sdp->cpu_number[j]; |
| 1320 | bcp = &per_cpu(bau_control, cpu); |
| 1321 | bcp->cpu = cpu; |
| 1322 | if (j == 0) { |
| 1323 | smaster = bcp; |
| 1324 | if (i == 0) |
| 1325 | hmaster = bcp; |
| 1326 | } |
| 1327 | bcp->cpus_in_uvhub = bdp->num_cpus; |
| 1328 | bcp->cpus_in_socket = sdp->num_cpus; |
| 1329 | bcp->socket_master = smaster; |
| 1330 | bcp->uvhub_master = hmaster; |
| 1331 | for (k = 0; k < DEST_Q_SIZE; k++) |
| 1332 | bcp->socket_acknowledge_count[k] = 0; |
| 1333 | bcp->uvhub_cpu = |
| 1334 | uv_cpu_hub_info(cpu)->blade_processor_id; |
| 1335 | } |
| 1336 | socket++; |
| 1337 | } |
| 1338 | } |
| 1339 | kfree(uvhub_descs); |
| 1340 | } |
| 1341 | |
| 1342 | /* |
| 1343 | * Initialization of BAU-related structures |
| 1344 | */ |
| 1345 | static int __init uv_bau_init(void) |
| 1346 | { |
| 1347 | int uvhub; |
| 1348 | int pnode; |
| 1349 | int nuvhubs; |
| 1350 | int cur_cpu; |
| 1351 | int vector; |
| 1352 | unsigned long mmr; |
| 1353 | |
| 1354 | if (!is_uv_system()) |
| 1355 | return 0; |
| 1356 | |
| 1357 | if (nobau) |
| 1358 | return 0; |
| 1359 | |
| 1360 | for_each_possible_cpu(cur_cpu) |
| 1361 | zalloc_cpumask_var_node(&per_cpu(uv_flush_tlb_mask, cur_cpu), |
| 1362 | GFP_KERNEL, cpu_to_node(cur_cpu)); |
| 1363 | |
| 1364 | uv_bau_max_concurrent = MAX_BAU_CONCURRENT; |
| 1365 | uv_nshift = uv_hub_info->m_val; |
| 1366 | uv_mmask = (1UL << uv_hub_info->m_val) - 1; |
| 1367 | nuvhubs = uv_num_possible_blades(); |
| 1368 | |
| 1369 | uv_init_per_cpu(nuvhubs); |
| 1370 | |
| 1371 | uv_partition_base_pnode = 0x7fffffff; |
| 1372 | for (uvhub = 0; uvhub < nuvhubs; uvhub++) |
| 1373 | if (uv_blade_nr_possible_cpus(uvhub) && |
| 1374 | (uv_blade_to_pnode(uvhub) < uv_partition_base_pnode)) |
| 1375 | uv_partition_base_pnode = uv_blade_to_pnode(uvhub); |
| 1376 | |
| 1377 | vector = UV_BAU_MESSAGE; |
| 1378 | for_each_possible_blade(uvhub) |
| 1379 | if (uv_blade_nr_possible_cpus(uvhub)) |
| 1380 | uv_init_uvhub(uvhub, vector); |
| 1381 | |
| 1382 | uv_enable_timeouts(); |
| 1383 | alloc_intr_gate(vector, uv_bau_message_intr1); |
| 1384 | |
| 1385 | for_each_possible_blade(uvhub) { |
| 1386 | pnode = uv_blade_to_pnode(uvhub); |
| 1387 | /* INIT the bau */ |
| 1388 | uv_write_global_mmr64(pnode, UVH_LB_BAU_SB_ACTIVATION_CONTROL, |
| 1389 | ((unsigned long)1 << 63)); |
| 1390 | mmr = 1; /* should be 1 to broadcast to both sockets */ |
| 1391 | uv_write_global_mmr64(pnode, UVH_BAU_DATA_BROADCAST, mmr); |
| 1392 | } |
| 1393 | |
| 1394 | return 0; |
| 1395 | } |
| 1396 | core_initcall(uv_bau_init); |
| 1397 | core_initcall(uv_ptc_init); |