1/* 2 * Linux for s390 qdio support, buffer handling, qdio API and module support. 3 * 4 * Copyright IBM Corp. 2000, 2008 5 * Author(s): Utz Bacher <utz.bacher@de.ibm.com> 6 * Jan Glauber <jang@linux.vnet.ibm.com> 7 * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com> 8 */ 9#include <linux/module.h> 10#include <linux/init.h> 11#include <linux/kernel.h> 12#include <linux/timer.h> 13#include <linux/delay.h> 14#include <linux/gfp.h> 15#include <linux/io.h> 16#include <linux/atomic.h> 17#include <asm/debug.h> 18#include <asm/qdio.h> 19#include <asm/ipl.h> 20 21#include "cio.h" 22#include "css.h" 23#include "device.h" 24#include "qdio.h" 25#include "qdio_debug.h" 26 27MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\ 28 "Jan Glauber <jang@linux.vnet.ibm.com>"); 29MODULE_DESCRIPTION("QDIO base support"); 30MODULE_LICENSE("GPL"); 31 32static inline int do_siga_sync(unsigned long schid, 33 unsigned int out_mask, unsigned int in_mask, 34 unsigned int fc) 35{ 36 register unsigned long __fc asm ("0") = fc; 37 register unsigned long __schid asm ("1") = schid; 38 register unsigned long out asm ("2") = out_mask; 39 register unsigned long in asm ("3") = in_mask; 40 int cc; 41 42 asm volatile( 43 " siga 0\n" 44 " ipm %0\n" 45 " srl %0,28\n" 46 : "=d" (cc) 47 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc"); 48 return cc; 49} 50 51static inline int do_siga_input(unsigned long schid, unsigned int mask, 52 unsigned int fc) 53{ 54 register unsigned long __fc asm ("0") = fc; 55 register unsigned long __schid asm ("1") = schid; 56 register unsigned long __mask asm ("2") = mask; 57 int cc; 58 59 asm volatile( 60 " siga 0\n" 61 " ipm %0\n" 62 " srl %0,28\n" 63 : "=d" (cc) 64 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc"); 65 return cc; 66} 67 68/** 69 * do_siga_output - perform SIGA-w/wt function 70 * @schid: subchannel id or in case of QEBSM the subchannel token 71 * @mask: which output queues to process 72 * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer 73 * @fc: function code to perform 74 * 75 * Returns condition code. 76 * Note: For IQDC unicast queues only the highest priority queue is processed. 77 */ 78static inline int do_siga_output(unsigned long schid, unsigned long mask, 79 unsigned int *bb, unsigned int fc, 80 unsigned long aob) 81{ 82 register unsigned long __fc asm("0") = fc; 83 register unsigned long __schid asm("1") = schid; 84 register unsigned long __mask asm("2") = mask; 85 register unsigned long __aob asm("3") = aob; 86 int cc; 87 88 asm volatile( 89 " siga 0\n" 90 " ipm %0\n" 91 " srl %0,28\n" 92 : "=d" (cc), "+d" (__fc), "+d" (__aob) 93 : "d" (__schid), "d" (__mask) 94 : "cc"); 95 *bb = __fc >> 31; 96 return cc; 97} 98 99static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq) 100{ 101 /* all done or next buffer state different */ 102 if (ccq == 0 || ccq == 32) 103 return 0; 104 /* no buffer processed */ 105 if (ccq == 97) 106 return 1; 107 /* not all buffers processed */ 108 if (ccq == 96) 109 return 2; 110 /* notify devices immediately */ 111 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq); 112 return -EIO; 113} 114 115/** 116 * qdio_do_eqbs - extract buffer states for QEBSM 117 * @q: queue to manipulate 118 * @state: state of the extracted buffers 119 * @start: buffer number to start at 120 * @count: count of buffers to examine 121 * @auto_ack: automatically acknowledge buffers 122 * 123 * Returns the number of successfully extracted equal buffer states. 124 * Stops processing if a state is different from the last buffers state. 125 */ 126static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state, 127 int start, int count, int auto_ack) 128{ 129 int rc, tmp_count = count, tmp_start = start, nr = q->nr, retried = 0; 130 unsigned int ccq = 0; 131 132 qperf_inc(q, eqbs); 133 134 if (!q->is_input_q) 135 nr += q->irq_ptr->nr_input_qs; 136again: 137 ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count, 138 auto_ack); 139 rc = qdio_check_ccq(q, ccq); 140 if (!rc) 141 return count - tmp_count; 142 143 if (rc == 1) { 144 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq); 145 goto again; 146 } 147 148 if (rc == 2) { 149 qperf_inc(q, eqbs_partial); 150 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x", 151 tmp_count); 152 /* 153 * Retry once, if that fails bail out and process the 154 * extracted buffers before trying again. 155 */ 156 if (!retried++) 157 goto again; 158 else 159 return count - tmp_count; 160 } 161 162 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q)); 163 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); 164 q->handler(q->irq_ptr->cdev, QDIO_ERROR_GET_BUF_STATE, 165 q->nr, q->first_to_kick, count, q->irq_ptr->int_parm); 166 return 0; 167} 168 169/** 170 * qdio_do_sqbs - set buffer states for QEBSM 171 * @q: queue to manipulate 172 * @state: new state of the buffers 173 * @start: first buffer number to change 174 * @count: how many buffers to change 175 * 176 * Returns the number of successfully changed buffers. 177 * Does retrying until the specified count of buffer states is set or an 178 * error occurs. 179 */ 180static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start, 181 int count) 182{ 183 unsigned int ccq = 0; 184 int tmp_count = count, tmp_start = start; 185 int nr = q->nr; 186 int rc; 187 188 if (!count) 189 return 0; 190 qperf_inc(q, sqbs); 191 192 if (!q->is_input_q) 193 nr += q->irq_ptr->nr_input_qs; 194again: 195 ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count); 196 rc = qdio_check_ccq(q, ccq); 197 if (!rc) { 198 WARN_ON_ONCE(tmp_count); 199 return count - tmp_count; 200 } 201 202 if (rc == 1 || rc == 2) { 203 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq); 204 qperf_inc(q, sqbs_partial); 205 goto again; 206 } 207 208 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q)); 209 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); 210 q->handler(q->irq_ptr->cdev, QDIO_ERROR_SET_BUF_STATE, 211 q->nr, q->first_to_kick, count, q->irq_ptr->int_parm); 212 return 0; 213} 214 215/* returns number of examined buffers and their common state in *state */ 216static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr, 217 unsigned char *state, unsigned int count, 218 int auto_ack, int merge_pending) 219{ 220 unsigned char __state = 0; 221 int i; 222 223 if (is_qebsm(q)) 224 return qdio_do_eqbs(q, state, bufnr, count, auto_ack); 225 226 for (i = 0; i < count; i++) { 227 if (!__state) { 228 __state = q->slsb.val[bufnr]; 229 if (merge_pending && __state == SLSB_P_OUTPUT_PENDING) 230 __state = SLSB_P_OUTPUT_EMPTY; 231 } else if (merge_pending) { 232 if ((q->slsb.val[bufnr] & __state) != __state) 233 break; 234 } else if (q->slsb.val[bufnr] != __state) 235 break; 236 bufnr = next_buf(bufnr); 237 } 238 *state = __state; 239 return i; 240} 241 242static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr, 243 unsigned char *state, int auto_ack) 244{ 245 return get_buf_states(q, bufnr, state, 1, auto_ack, 0); 246} 247 248/* wrap-around safe setting of slsb states, returns number of changed buffers */ 249static inline int set_buf_states(struct qdio_q *q, int bufnr, 250 unsigned char state, int count) 251{ 252 int i; 253 254 if (is_qebsm(q)) 255 return qdio_do_sqbs(q, state, bufnr, count); 256 257 for (i = 0; i < count; i++) { 258 xchg(&q->slsb.val[bufnr], state); 259 bufnr = next_buf(bufnr); 260 } 261 return count; 262} 263 264static inline int set_buf_state(struct qdio_q *q, int bufnr, 265 unsigned char state) 266{ 267 return set_buf_states(q, bufnr, state, 1); 268} 269 270/* set slsb states to initial state */ 271static void qdio_init_buf_states(struct qdio_irq *irq_ptr) 272{ 273 struct qdio_q *q; 274 int i; 275 276 for_each_input_queue(irq_ptr, q, i) 277 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT, 278 QDIO_MAX_BUFFERS_PER_Q); 279 for_each_output_queue(irq_ptr, q, i) 280 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT, 281 QDIO_MAX_BUFFERS_PER_Q); 282} 283 284static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output, 285 unsigned int input) 286{ 287 unsigned long schid = *((u32 *) &q->irq_ptr->schid); 288 unsigned int fc = QDIO_SIGA_SYNC; 289 int cc; 290 291 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr); 292 qperf_inc(q, siga_sync); 293 294 if (is_qebsm(q)) { 295 schid = q->irq_ptr->sch_token; 296 fc |= QDIO_SIGA_QEBSM_FLAG; 297 } 298 299 cc = do_siga_sync(schid, output, input, fc); 300 if (unlikely(cc)) 301 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc); 302 return (cc) ? -EIO : 0; 303} 304 305static inline int qdio_siga_sync_q(struct qdio_q *q) 306{ 307 if (q->is_input_q) 308 return qdio_siga_sync(q, 0, q->mask); 309 else 310 return qdio_siga_sync(q, q->mask, 0); 311} 312 313static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit, 314 unsigned long aob) 315{ 316 unsigned long schid = *((u32 *) &q->irq_ptr->schid); 317 unsigned int fc = QDIO_SIGA_WRITE; 318 u64 start_time = 0; 319 int retries = 0, cc; 320 unsigned long laob = 0; 321 322 if (q->u.out.use_cq && aob != 0) { 323 fc = QDIO_SIGA_WRITEQ; 324 laob = aob; 325 } 326 327 if (is_qebsm(q)) { 328 schid = q->irq_ptr->sch_token; 329 fc |= QDIO_SIGA_QEBSM_FLAG; 330 } 331again: 332 WARN_ON_ONCE((aob && queue_type(q) != QDIO_IQDIO_QFMT) || 333 (aob && fc != QDIO_SIGA_WRITEQ)); 334 cc = do_siga_output(schid, q->mask, busy_bit, fc, laob); 335 336 /* hipersocket busy condition */ 337 if (unlikely(*busy_bit)) { 338 retries++; 339 340 if (!start_time) { 341 start_time = get_tod_clock_fast(); 342 goto again; 343 } 344 if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE) 345 goto again; 346 } 347 if (retries) { 348 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, 349 "%4x cc2 BB1:%1d", SCH_NO(q), q->nr); 350 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries); 351 } 352 return cc; 353} 354 355static inline int qdio_siga_input(struct qdio_q *q) 356{ 357 unsigned long schid = *((u32 *) &q->irq_ptr->schid); 358 unsigned int fc = QDIO_SIGA_READ; 359 int cc; 360 361 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr); 362 qperf_inc(q, siga_read); 363 364 if (is_qebsm(q)) { 365 schid = q->irq_ptr->sch_token; 366 fc |= QDIO_SIGA_QEBSM_FLAG; 367 } 368 369 cc = do_siga_input(schid, q->mask, fc); 370 if (unlikely(cc)) 371 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc); 372 return (cc) ? -EIO : 0; 373} 374 375#define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0) 376#define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U) 377 378static inline void qdio_sync_queues(struct qdio_q *q) 379{ 380 /* PCI capable outbound queues will also be scanned so sync them too */ 381 if (pci_out_supported(q)) 382 qdio_siga_sync_all(q); 383 else 384 qdio_siga_sync_q(q); 385} 386 387int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr, 388 unsigned char *state) 389{ 390 if (need_siga_sync(q)) 391 qdio_siga_sync_q(q); 392 return get_buf_states(q, bufnr, state, 1, 0, 0); 393} 394 395static inline void qdio_stop_polling(struct qdio_q *q) 396{ 397 if (!q->u.in.polling) 398 return; 399 400 q->u.in.polling = 0; 401 qperf_inc(q, stop_polling); 402 403 /* show the card that we are not polling anymore */ 404 if (is_qebsm(q)) { 405 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, 406 q->u.in.ack_count); 407 q->u.in.ack_count = 0; 408 } else 409 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); 410} 411 412static inline void account_sbals(struct qdio_q *q, unsigned int count) 413{ 414 int pos; 415 416 q->q_stats.nr_sbal_total += count; 417 if (count == QDIO_MAX_BUFFERS_MASK) { 418 q->q_stats.nr_sbals[7]++; 419 return; 420 } 421 pos = ilog2(count); 422 q->q_stats.nr_sbals[pos]++; 423} 424 425static void process_buffer_error(struct qdio_q *q, int count) 426{ 427 unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT : 428 SLSB_P_OUTPUT_NOT_INIT; 429 430 q->qdio_error = QDIO_ERROR_SLSB_STATE; 431 432 /* special handling for no target buffer empty */ 433 if ((!q->is_input_q && 434 (q->sbal[q->first_to_check]->element[15].sflags) == 0x10)) { 435 qperf_inc(q, target_full); 436 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", 437 q->first_to_check); 438 goto set; 439 } 440 441 DBF_ERROR("%4x BUF ERROR", SCH_NO(q)); 442 DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr); 443 DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count); 444 DBF_ERROR("F14:%2x F15:%2x", 445 q->sbal[q->first_to_check]->element[14].sflags, 446 q->sbal[q->first_to_check]->element[15].sflags); 447 448set: 449 /* 450 * Interrupts may be avoided as long as the error is present 451 * so change the buffer state immediately to avoid starvation. 452 */ 453 set_buf_states(q, q->first_to_check, state, count); 454} 455 456static inline void inbound_primed(struct qdio_q *q, int count) 457{ 458 int new; 459 460 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count); 461 462 /* for QEBSM the ACK was already set by EQBS */ 463 if (is_qebsm(q)) { 464 if (!q->u.in.polling) { 465 q->u.in.polling = 1; 466 q->u.in.ack_count = count; 467 q->u.in.ack_start = q->first_to_check; 468 return; 469 } 470 471 /* delete the previous ACK's */ 472 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, 473 q->u.in.ack_count); 474 q->u.in.ack_count = count; 475 q->u.in.ack_start = q->first_to_check; 476 return; 477 } 478 479 /* 480 * ACK the newest buffer. The ACK will be removed in qdio_stop_polling 481 * or by the next inbound run. 482 */ 483 new = add_buf(q->first_to_check, count - 1); 484 if (q->u.in.polling) { 485 /* reset the previous ACK but first set the new one */ 486 set_buf_state(q, new, SLSB_P_INPUT_ACK); 487 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); 488 } else { 489 q->u.in.polling = 1; 490 set_buf_state(q, new, SLSB_P_INPUT_ACK); 491 } 492 493 q->u.in.ack_start = new; 494 count--; 495 if (!count) 496 return; 497 /* need to change ALL buffers to get more interrupts */ 498 set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count); 499} 500 501static int get_inbound_buffer_frontier(struct qdio_q *q) 502{ 503 int count, stop; 504 unsigned char state = 0; 505 506 q->timestamp = get_tod_clock_fast(); 507 508 /* 509 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved 510 * would return 0. 511 */ 512 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); 513 stop = add_buf(q->first_to_check, count); 514 515 if (q->first_to_check == stop) 516 goto out; 517 518 /* 519 * No siga sync here, as a PCI or we after a thin interrupt 520 * already sync'ed the queues. 521 */ 522 count = get_buf_states(q, q->first_to_check, &state, count, 1, 0); 523 if (!count) 524 goto out; 525 526 switch (state) { 527 case SLSB_P_INPUT_PRIMED: 528 inbound_primed(q, count); 529 q->first_to_check = add_buf(q->first_to_check, count); 530 if (atomic_sub_return(count, &q->nr_buf_used) == 0) 531 qperf_inc(q, inbound_queue_full); 532 if (q->irq_ptr->perf_stat_enabled) 533 account_sbals(q, count); 534 break; 535 case SLSB_P_INPUT_ERROR: 536 process_buffer_error(q, count); 537 q->first_to_check = add_buf(q->first_to_check, count); 538 atomic_sub(count, &q->nr_buf_used); 539 if (q->irq_ptr->perf_stat_enabled) 540 account_sbals_error(q, count); 541 break; 542 case SLSB_CU_INPUT_EMPTY: 543 case SLSB_P_INPUT_NOT_INIT: 544 case SLSB_P_INPUT_ACK: 545 if (q->irq_ptr->perf_stat_enabled) 546 q->q_stats.nr_sbal_nop++; 547 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop"); 548 break; 549 default: 550 WARN_ON_ONCE(1); 551 } 552out: 553 return q->first_to_check; 554} 555 556static int qdio_inbound_q_moved(struct qdio_q *q) 557{ 558 int bufnr; 559 560 bufnr = get_inbound_buffer_frontier(q); 561 562 if (bufnr != q->last_move) { 563 q->last_move = bufnr; 564 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR) 565 q->u.in.timestamp = get_tod_clock(); 566 return 1; 567 } else 568 return 0; 569} 570 571static inline int qdio_inbound_q_done(struct qdio_q *q) 572{ 573 unsigned char state = 0; 574 575 if (!atomic_read(&q->nr_buf_used)) 576 return 1; 577 578 if (need_siga_sync(q)) 579 qdio_siga_sync_q(q); 580 get_buf_state(q, q->first_to_check, &state, 0); 581 582 if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR) 583 /* more work coming */ 584 return 0; 585 586 if (is_thinint_irq(q->irq_ptr)) 587 return 1; 588 589 /* don't poll under z/VM */ 590 if (MACHINE_IS_VM) 591 return 1; 592 593 /* 594 * At this point we know, that inbound first_to_check 595 * has (probably) not moved (see qdio_inbound_processing). 596 */ 597 if (get_tod_clock_fast() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) { 598 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x", 599 q->first_to_check); 600 return 1; 601 } else 602 return 0; 603} 604 605static inline int contains_aobs(struct qdio_q *q) 606{ 607 return !q->is_input_q && q->u.out.use_cq; 608} 609 610static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count) 611{ 612 unsigned char state = 0; 613 int j, b = start; 614 615 if (!contains_aobs(q)) 616 return; 617 618 for (j = 0; j < count; ++j) { 619 get_buf_state(q, b, &state, 0); 620 if (state == SLSB_P_OUTPUT_PENDING) { 621 struct qaob *aob = q->u.out.aobs[b]; 622 if (aob == NULL) 623 continue; 624 625 q->u.out.sbal_state[b].flags |= 626 QDIO_OUTBUF_STATE_FLAG_PENDING; 627 q->u.out.aobs[b] = NULL; 628 } else if (state == SLSB_P_OUTPUT_EMPTY) { 629 q->u.out.sbal_state[b].aob = NULL; 630 } 631 b = next_buf(b); 632 } 633} 634 635static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q, 636 int bufnr) 637{ 638 unsigned long phys_aob = 0; 639 640 if (!q->use_cq) 641 goto out; 642 643 if (!q->aobs[bufnr]) { 644 struct qaob *aob = qdio_allocate_aob(); 645 q->aobs[bufnr] = aob; 646 } 647 if (q->aobs[bufnr]) { 648 q->sbal_state[bufnr].flags = QDIO_OUTBUF_STATE_FLAG_NONE; 649 q->sbal_state[bufnr].aob = q->aobs[bufnr]; 650 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user; 651 phys_aob = virt_to_phys(q->aobs[bufnr]); 652 WARN_ON_ONCE(phys_aob & 0xFF); 653 } 654 655out: 656 return phys_aob; 657} 658 659static void qdio_kick_handler(struct qdio_q *q) 660{ 661 int start = q->first_to_kick; 662 int end = q->first_to_check; 663 int count; 664 665 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) 666 return; 667 668 count = sub_buf(end, start); 669 670 if (q->is_input_q) { 671 qperf_inc(q, inbound_handler); 672 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count); 673 } else { 674 qperf_inc(q, outbound_handler); 675 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x", 676 start, count); 677 } 678 679 qdio_handle_aobs(q, start, count); 680 681 q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count, 682 q->irq_ptr->int_parm); 683 684 /* for the next time */ 685 q->first_to_kick = end; 686 q->qdio_error = 0; 687} 688 689static void __qdio_inbound_processing(struct qdio_q *q) 690{ 691 qperf_inc(q, tasklet_inbound); 692 693 if (!qdio_inbound_q_moved(q)) 694 return; 695 696 qdio_kick_handler(q); 697 698 if (!qdio_inbound_q_done(q)) { 699 /* means poll time is not yet over */ 700 qperf_inc(q, tasklet_inbound_resched); 701 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) { 702 tasklet_schedule(&q->tasklet); 703 return; 704 } 705 } 706 707 qdio_stop_polling(q); 708 /* 709 * We need to check again to not lose initiative after 710 * resetting the ACK state. 711 */ 712 if (!qdio_inbound_q_done(q)) { 713 qperf_inc(q, tasklet_inbound_resched2); 714 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) 715 tasklet_schedule(&q->tasklet); 716 } 717} 718 719void qdio_inbound_processing(unsigned long data) 720{ 721 struct qdio_q *q = (struct qdio_q *)data; 722 __qdio_inbound_processing(q); 723} 724 725static int get_outbound_buffer_frontier(struct qdio_q *q) 726{ 727 int count, stop; 728 unsigned char state = 0; 729 730 q->timestamp = get_tod_clock_fast(); 731 732 if (need_siga_sync(q)) 733 if (((queue_type(q) != QDIO_IQDIO_QFMT) && 734 !pci_out_supported(q)) || 735 (queue_type(q) == QDIO_IQDIO_QFMT && 736 multicast_outbound(q))) 737 qdio_siga_sync_q(q); 738 739 /* 740 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved 741 * would return 0. 742 */ 743 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); 744 stop = add_buf(q->first_to_check, count); 745 if (q->first_to_check == stop) 746 goto out; 747 748 count = get_buf_states(q, q->first_to_check, &state, count, 0, 1); 749 if (!count) 750 goto out; 751 752 switch (state) { 753 case SLSB_P_OUTPUT_EMPTY: 754 /* the adapter got it */ 755 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, 756 "out empty:%1d %02x", q->nr, count); 757 758 atomic_sub(count, &q->nr_buf_used); 759 q->first_to_check = add_buf(q->first_to_check, count); 760 if (q->irq_ptr->perf_stat_enabled) 761 account_sbals(q, count); 762 763 break; 764 case SLSB_P_OUTPUT_ERROR: 765 process_buffer_error(q, count); 766 q->first_to_check = add_buf(q->first_to_check, count); 767 atomic_sub(count, &q->nr_buf_used); 768 if (q->irq_ptr->perf_stat_enabled) 769 account_sbals_error(q, count); 770 break; 771 case SLSB_CU_OUTPUT_PRIMED: 772 /* the adapter has not fetched the output yet */ 773 if (q->irq_ptr->perf_stat_enabled) 774 q->q_stats.nr_sbal_nop++; 775 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", 776 q->nr); 777 break; 778 case SLSB_P_OUTPUT_NOT_INIT: 779 case SLSB_P_OUTPUT_HALTED: 780 break; 781 default: 782 WARN_ON_ONCE(1); 783 } 784 785out: 786 return q->first_to_check; 787} 788 789/* all buffers processed? */ 790static inline int qdio_outbound_q_done(struct qdio_q *q) 791{ 792 return atomic_read(&q->nr_buf_used) == 0; 793} 794 795static inline int qdio_outbound_q_moved(struct qdio_q *q) 796{ 797 int bufnr; 798 799 bufnr = get_outbound_buffer_frontier(q); 800 801 if (bufnr != q->last_move) { 802 q->last_move = bufnr; 803 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr); 804 return 1; 805 } else 806 return 0; 807} 808 809static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob) 810{ 811 int retries = 0, cc; 812 unsigned int busy_bit; 813 814 if (!need_siga_out(q)) 815 return 0; 816 817 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr); 818retry: 819 qperf_inc(q, siga_write); 820 821 cc = qdio_siga_output(q, &busy_bit, aob); 822 switch (cc) { 823 case 0: 824 break; 825 case 2: 826 if (busy_bit) { 827 while (++retries < QDIO_BUSY_BIT_RETRIES) { 828 mdelay(QDIO_BUSY_BIT_RETRY_DELAY); 829 goto retry; 830 } 831 DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr); 832 cc = -EBUSY; 833 } else { 834 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr); 835 cc = -ENOBUFS; 836 } 837 break; 838 case 1: 839 case 3: 840 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc); 841 cc = -EIO; 842 break; 843 } 844 if (retries) { 845 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr); 846 DBF_ERROR("count:%u", retries); 847 } 848 return cc; 849} 850 851static void __qdio_outbound_processing(struct qdio_q *q) 852{ 853 qperf_inc(q, tasklet_outbound); 854 WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0); 855 856 if (qdio_outbound_q_moved(q)) 857 qdio_kick_handler(q); 858 859 if (queue_type(q) == QDIO_ZFCP_QFMT) 860 if (!pci_out_supported(q) && !qdio_outbound_q_done(q)) 861 goto sched; 862 863 if (q->u.out.pci_out_enabled) 864 return; 865 866 /* 867 * Now we know that queue type is either qeth without pci enabled 868 * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY 869 * is noticed and outbound_handler is called after some time. 870 */ 871 if (qdio_outbound_q_done(q)) 872 del_timer(&q->u.out.timer); 873 else 874 if (!timer_pending(&q->u.out.timer)) 875 mod_timer(&q->u.out.timer, jiffies + 10 * HZ); 876 return; 877 878sched: 879 if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) 880 return; 881 tasklet_schedule(&q->tasklet); 882} 883 884/* outbound tasklet */ 885void qdio_outbound_processing(unsigned long data) 886{ 887 struct qdio_q *q = (struct qdio_q *)data; 888 __qdio_outbound_processing(q); 889} 890 891void qdio_outbound_timer(unsigned long data) 892{ 893 struct qdio_q *q = (struct qdio_q *)data; 894 895 if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) 896 return; 897 tasklet_schedule(&q->tasklet); 898} 899 900static inline void qdio_check_outbound_after_thinint(struct qdio_q *q) 901{ 902 struct qdio_q *out; 903 int i; 904 905 if (!pci_out_supported(q)) 906 return; 907 908 for_each_output_queue(q->irq_ptr, out, i) 909 if (!qdio_outbound_q_done(out)) 910 tasklet_schedule(&out->tasklet); 911} 912 913static void __tiqdio_inbound_processing(struct qdio_q *q) 914{ 915 qperf_inc(q, tasklet_inbound); 916 if (need_siga_sync(q) && need_siga_sync_after_ai(q)) 917 qdio_sync_queues(q); 918 919 /* 920 * The interrupt could be caused by a PCI request. Check the 921 * PCI capable outbound queues. 922 */ 923 qdio_check_outbound_after_thinint(q); 924 925 if (!qdio_inbound_q_moved(q)) 926 return; 927 928 qdio_kick_handler(q); 929 930 if (!qdio_inbound_q_done(q)) { 931 qperf_inc(q, tasklet_inbound_resched); 932 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) { 933 tasklet_schedule(&q->tasklet); 934 return; 935 } 936 } 937 938 qdio_stop_polling(q); 939 /* 940 * We need to check again to not lose initiative after 941 * resetting the ACK state. 942 */ 943 if (!qdio_inbound_q_done(q)) { 944 qperf_inc(q, tasklet_inbound_resched2); 945 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) 946 tasklet_schedule(&q->tasklet); 947 } 948} 949 950void tiqdio_inbound_processing(unsigned long data) 951{ 952 struct qdio_q *q = (struct qdio_q *)data; 953 __tiqdio_inbound_processing(q); 954} 955 956static inline void qdio_set_state(struct qdio_irq *irq_ptr, 957 enum qdio_irq_states state) 958{ 959 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state); 960 961 irq_ptr->state = state; 962 mb(); 963} 964 965static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb) 966{ 967 if (irb->esw.esw0.erw.cons) { 968 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no); 969 DBF_ERROR_HEX(irb, 64); 970 DBF_ERROR_HEX(irb->ecw, 64); 971 } 972} 973 974/* PCI interrupt handler */ 975static void qdio_int_handler_pci(struct qdio_irq *irq_ptr) 976{ 977 int i; 978 struct qdio_q *q; 979 980 if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) 981 return; 982 983 for_each_input_queue(irq_ptr, q, i) { 984 if (q->u.in.queue_start_poll) { 985 /* skip if polling is enabled or already in work */ 986 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, 987 &q->u.in.queue_irq_state)) { 988 qperf_inc(q, int_discarded); 989 continue; 990 } 991 q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr, 992 q->irq_ptr->int_parm); 993 } else { 994 tasklet_schedule(&q->tasklet); 995 } 996 } 997 998 if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)) 999 return; 1000 1001 for_each_output_queue(irq_ptr, q, i) { 1002 if (qdio_outbound_q_done(q)) 1003 continue; 1004 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q)) 1005 qdio_siga_sync_q(q); 1006 tasklet_schedule(&q->tasklet); 1007 } 1008} 1009 1010static void qdio_handle_activate_check(struct ccw_device *cdev, 1011 unsigned long intparm, int cstat, int dstat) 1012{ 1013 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1014 struct qdio_q *q; 1015 int count; 1016 1017 DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no); 1018 DBF_ERROR("intp :%lx", intparm); 1019 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); 1020 1021 if (irq_ptr->nr_input_qs) { 1022 q = irq_ptr->input_qs[0]; 1023 } else if (irq_ptr->nr_output_qs) { 1024 q = irq_ptr->output_qs[0]; 1025 } else { 1026 dump_stack(); 1027 goto no_handler; 1028 } 1029 1030 count = sub_buf(q->first_to_check, q->first_to_kick); 1031 q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE, 1032 q->nr, q->first_to_kick, count, irq_ptr->int_parm); 1033no_handler: 1034 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); 1035 /* 1036 * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen. 1037 * Therefore we call the LGR detection function here. 1038 */ 1039 lgr_info_log(); 1040} 1041 1042static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat, 1043 int dstat) 1044{ 1045 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1046 1047 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq"); 1048 1049 if (cstat) 1050 goto error; 1051 if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END)) 1052 goto error; 1053 if (!(dstat & DEV_STAT_DEV_END)) 1054 goto error; 1055 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED); 1056 return; 1057 1058error: 1059 DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no); 1060 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); 1061 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); 1062} 1063 1064/* qdio interrupt handler */ 1065void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm, 1066 struct irb *irb) 1067{ 1068 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1069 int cstat, dstat; 1070 1071 if (!intparm || !irq_ptr) { 1072 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no); 1073 return; 1074 } 1075 1076 if (irq_ptr->perf_stat_enabled) 1077 irq_ptr->perf_stat.qdio_int++; 1078 1079 if (IS_ERR(irb)) { 1080 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no); 1081 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); 1082 wake_up(&cdev->private->wait_q); 1083 return; 1084 } 1085 qdio_irq_check_sense(irq_ptr, irb); 1086 cstat = irb->scsw.cmd.cstat; 1087 dstat = irb->scsw.cmd.dstat; 1088 1089 switch (irq_ptr->state) { 1090 case QDIO_IRQ_STATE_INACTIVE: 1091 qdio_establish_handle_irq(cdev, cstat, dstat); 1092 break; 1093 case QDIO_IRQ_STATE_CLEANUP: 1094 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); 1095 break; 1096 case QDIO_IRQ_STATE_ESTABLISHED: 1097 case QDIO_IRQ_STATE_ACTIVE: 1098 if (cstat & SCHN_STAT_PCI) { 1099 qdio_int_handler_pci(irq_ptr); 1100 return; 1101 } 1102 if (cstat || dstat) 1103 qdio_handle_activate_check(cdev, intparm, cstat, 1104 dstat); 1105 break; 1106 case QDIO_IRQ_STATE_STOPPED: 1107 break; 1108 default: 1109 WARN_ON_ONCE(1); 1110 } 1111 wake_up(&cdev->private->wait_q); 1112} 1113 1114/** 1115 * qdio_get_ssqd_desc - get qdio subchannel description 1116 * @cdev: ccw device to get description for 1117 * @data: where to store the ssqd 1118 * 1119 * Returns 0 or an error code. The results of the chsc are stored in the 1120 * specified structure. 1121 */ 1122int qdio_get_ssqd_desc(struct ccw_device *cdev, 1123 struct qdio_ssqd_desc *data) 1124{ 1125 1126 if (!cdev || !cdev->private) 1127 return -EINVAL; 1128 1129 DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no); 1130 return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data); 1131} 1132EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc); 1133 1134static void qdio_shutdown_queues(struct ccw_device *cdev) 1135{ 1136 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1137 struct qdio_q *q; 1138 int i; 1139 1140 for_each_input_queue(irq_ptr, q, i) 1141 tasklet_kill(&q->tasklet); 1142 1143 for_each_output_queue(irq_ptr, q, i) { 1144 del_timer(&q->u.out.timer); 1145 tasklet_kill(&q->tasklet); 1146 } 1147} 1148 1149/** 1150 * qdio_shutdown - shut down a qdio subchannel 1151 * @cdev: associated ccw device 1152 * @how: use halt or clear to shutdown 1153 */ 1154int qdio_shutdown(struct ccw_device *cdev, int how) 1155{ 1156 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1157 int rc; 1158 unsigned long flags; 1159 1160 if (!irq_ptr) 1161 return -ENODEV; 1162 1163 WARN_ON_ONCE(irqs_disabled()); 1164 DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no); 1165 1166 mutex_lock(&irq_ptr->setup_mutex); 1167 /* 1168 * Subchannel was already shot down. We cannot prevent being called 1169 * twice since cio may trigger a shutdown asynchronously. 1170 */ 1171 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { 1172 mutex_unlock(&irq_ptr->setup_mutex); 1173 return 0; 1174 } 1175 1176 /* 1177 * Indicate that the device is going down. Scheduling the queue 1178 * tasklets is forbidden from here on. 1179 */ 1180 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); 1181 1182 tiqdio_remove_input_queues(irq_ptr); 1183 qdio_shutdown_queues(cdev); 1184 qdio_shutdown_debug_entries(irq_ptr); 1185 1186 /* cleanup subchannel */ 1187 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1188 1189 if (how & QDIO_FLAG_CLEANUP_USING_CLEAR) 1190 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP); 1191 else 1192 /* default behaviour is halt */ 1193 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP); 1194 if (rc) { 1195 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no); 1196 DBF_ERROR("rc:%4d", rc); 1197 goto no_cleanup; 1198 } 1199 1200 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP); 1201 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1202 wait_event_interruptible_timeout(cdev->private->wait_q, 1203 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE || 1204 irq_ptr->state == QDIO_IRQ_STATE_ERR, 1205 10 * HZ); 1206 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1207 1208no_cleanup: 1209 qdio_shutdown_thinint(irq_ptr); 1210 1211 /* restore interrupt handler */ 1212 if ((void *)cdev->handler == (void *)qdio_int_handler) 1213 cdev->handler = irq_ptr->orig_handler; 1214 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1215 1216 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); 1217 mutex_unlock(&irq_ptr->setup_mutex); 1218 if (rc) 1219 return rc; 1220 return 0; 1221} 1222EXPORT_SYMBOL_GPL(qdio_shutdown); 1223 1224/** 1225 * qdio_free - free data structures for a qdio subchannel 1226 * @cdev: associated ccw device 1227 */ 1228int qdio_free(struct ccw_device *cdev) 1229{ 1230 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1231 1232 if (!irq_ptr) 1233 return -ENODEV; 1234 1235 DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no); 1236 DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned"); 1237 mutex_lock(&irq_ptr->setup_mutex); 1238 1239 irq_ptr->debug_area = NULL; 1240 cdev->private->qdio_data = NULL; 1241 mutex_unlock(&irq_ptr->setup_mutex); 1242 1243 qdio_release_memory(irq_ptr); 1244 return 0; 1245} 1246EXPORT_SYMBOL_GPL(qdio_free); 1247 1248/** 1249 * qdio_allocate - allocate qdio queues and associated data 1250 * @init_data: initialization data 1251 */ 1252int qdio_allocate(struct qdio_initialize *init_data) 1253{ 1254 struct qdio_irq *irq_ptr; 1255 1256 DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no); 1257 1258 if ((init_data->no_input_qs && !init_data->input_handler) || 1259 (init_data->no_output_qs && !init_data->output_handler)) 1260 return -EINVAL; 1261 1262 if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) || 1263 (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)) 1264 return -EINVAL; 1265 1266 if ((!init_data->input_sbal_addr_array) || 1267 (!init_data->output_sbal_addr_array)) 1268 return -EINVAL; 1269 1270 /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */ 1271 irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 1272 if (!irq_ptr) 1273 goto out_err; 1274 1275 mutex_init(&irq_ptr->setup_mutex); 1276 if (qdio_allocate_dbf(init_data, irq_ptr)) 1277 goto out_rel; 1278 1279 /* 1280 * Allocate a page for the chsc calls in qdio_establish. 1281 * Must be pre-allocated since a zfcp recovery will call 1282 * qdio_establish. In case of low memory and swap on a zfcp disk 1283 * we may not be able to allocate memory otherwise. 1284 */ 1285 irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL); 1286 if (!irq_ptr->chsc_page) 1287 goto out_rel; 1288 1289 /* qdr is used in ccw1.cda which is u32 */ 1290 irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 1291 if (!irq_ptr->qdr) 1292 goto out_rel; 1293 1294 if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs, 1295 init_data->no_output_qs)) 1296 goto out_rel; 1297 1298 init_data->cdev->private->qdio_data = irq_ptr; 1299 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); 1300 return 0; 1301out_rel: 1302 qdio_release_memory(irq_ptr); 1303out_err: 1304 return -ENOMEM; 1305} 1306EXPORT_SYMBOL_GPL(qdio_allocate); 1307 1308static void qdio_detect_hsicq(struct qdio_irq *irq_ptr) 1309{ 1310 struct qdio_q *q = irq_ptr->input_qs[0]; 1311 int i, use_cq = 0; 1312 1313 if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT) 1314 use_cq = 1; 1315 1316 for_each_output_queue(irq_ptr, q, i) { 1317 if (use_cq) { 1318 if (qdio_enable_async_operation(&q->u.out) < 0) { 1319 use_cq = 0; 1320 continue; 1321 } 1322 } else 1323 qdio_disable_async_operation(&q->u.out); 1324 } 1325 DBF_EVENT("use_cq:%d", use_cq); 1326} 1327 1328/** 1329 * qdio_establish - establish queues on a qdio subchannel 1330 * @init_data: initialization data 1331 */ 1332int qdio_establish(struct qdio_initialize *init_data) 1333{ 1334 struct qdio_irq *irq_ptr; 1335 struct ccw_device *cdev = init_data->cdev; 1336 unsigned long saveflags; 1337 int rc; 1338 1339 DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no); 1340 1341 irq_ptr = cdev->private->qdio_data; 1342 if (!irq_ptr) 1343 return -ENODEV; 1344 1345 if (cdev->private->state != DEV_STATE_ONLINE) 1346 return -EINVAL; 1347 1348 mutex_lock(&irq_ptr->setup_mutex); 1349 qdio_setup_irq(init_data); 1350 1351 rc = qdio_establish_thinint(irq_ptr); 1352 if (rc) { 1353 mutex_unlock(&irq_ptr->setup_mutex); 1354 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); 1355 return rc; 1356 } 1357 1358 /* establish q */ 1359 irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd; 1360 irq_ptr->ccw.flags = CCW_FLAG_SLI; 1361 irq_ptr->ccw.count = irq_ptr->equeue.count; 1362 irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr); 1363 1364 spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); 1365 ccw_device_set_options_mask(cdev, 0); 1366 1367 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0); 1368 if (rc) { 1369 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no); 1370 DBF_ERROR("rc:%4x", rc); 1371 } 1372 spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); 1373 1374 if (rc) { 1375 mutex_unlock(&irq_ptr->setup_mutex); 1376 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); 1377 return rc; 1378 } 1379 1380 wait_event_interruptible_timeout(cdev->private->wait_q, 1381 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED || 1382 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ); 1383 1384 if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) { 1385 mutex_unlock(&irq_ptr->setup_mutex); 1386 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); 1387 return -EIO; 1388 } 1389 1390 qdio_setup_ssqd_info(irq_ptr); 1391 1392 qdio_detect_hsicq(irq_ptr); 1393 1394 /* qebsm is now setup if available, initialize buffer states */ 1395 qdio_init_buf_states(irq_ptr); 1396 1397 mutex_unlock(&irq_ptr->setup_mutex); 1398 qdio_print_subchannel_info(irq_ptr, cdev); 1399 qdio_setup_debug_entries(irq_ptr, cdev); 1400 return 0; 1401} 1402EXPORT_SYMBOL_GPL(qdio_establish); 1403 1404/** 1405 * qdio_activate - activate queues on a qdio subchannel 1406 * @cdev: associated cdev 1407 */ 1408int qdio_activate(struct ccw_device *cdev) 1409{ 1410 struct qdio_irq *irq_ptr; 1411 int rc; 1412 unsigned long saveflags; 1413 1414 DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no); 1415 1416 irq_ptr = cdev->private->qdio_data; 1417 if (!irq_ptr) 1418 return -ENODEV; 1419 1420 if (cdev->private->state != DEV_STATE_ONLINE) 1421 return -EINVAL; 1422 1423 mutex_lock(&irq_ptr->setup_mutex); 1424 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { 1425 rc = -EBUSY; 1426 goto out; 1427 } 1428 1429 irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd; 1430 irq_ptr->ccw.flags = CCW_FLAG_SLI; 1431 irq_ptr->ccw.count = irq_ptr->aqueue.count; 1432 irq_ptr->ccw.cda = 0; 1433 1434 spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); 1435 ccw_device_set_options(cdev, CCWDEV_REPORT_ALL); 1436 1437 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE, 1438 0, DOIO_DENY_PREFETCH); 1439 if (rc) { 1440 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no); 1441 DBF_ERROR("rc:%4x", rc); 1442 } 1443 spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); 1444 1445 if (rc) 1446 goto out; 1447 1448 if (is_thinint_irq(irq_ptr)) 1449 tiqdio_add_input_queues(irq_ptr); 1450 1451 /* wait for subchannel to become active */ 1452 msleep(5); 1453 1454 switch (irq_ptr->state) { 1455 case QDIO_IRQ_STATE_STOPPED: 1456 case QDIO_IRQ_STATE_ERR: 1457 rc = -EIO; 1458 break; 1459 default: 1460 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE); 1461 rc = 0; 1462 } 1463out: 1464 mutex_unlock(&irq_ptr->setup_mutex); 1465 return rc; 1466} 1467EXPORT_SYMBOL_GPL(qdio_activate); 1468 1469static inline int buf_in_between(int bufnr, int start, int count) 1470{ 1471 int end = add_buf(start, count); 1472 1473 if (end > start) { 1474 if (bufnr >= start && bufnr < end) 1475 return 1; 1476 else 1477 return 0; 1478 } 1479 1480 /* wrap-around case */ 1481 if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) || 1482 (bufnr < end)) 1483 return 1; 1484 else 1485 return 0; 1486} 1487 1488/** 1489 * handle_inbound - reset processed input buffers 1490 * @q: queue containing the buffers 1491 * @callflags: flags 1492 * @bufnr: first buffer to process 1493 * @count: how many buffers are emptied 1494 */ 1495static int handle_inbound(struct qdio_q *q, unsigned int callflags, 1496 int bufnr, int count) 1497{ 1498 int diff; 1499 1500 qperf_inc(q, inbound_call); 1501 1502 if (!q->u.in.polling) 1503 goto set; 1504 1505 /* protect against stop polling setting an ACK for an emptied slsb */ 1506 if (count == QDIO_MAX_BUFFERS_PER_Q) { 1507 /* overwriting everything, just delete polling status */ 1508 q->u.in.polling = 0; 1509 q->u.in.ack_count = 0; 1510 goto set; 1511 } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) { 1512 if (is_qebsm(q)) { 1513 /* partial overwrite, just update ack_start */ 1514 diff = add_buf(bufnr, count); 1515 diff = sub_buf(diff, q->u.in.ack_start); 1516 q->u.in.ack_count -= diff; 1517 if (q->u.in.ack_count <= 0) { 1518 q->u.in.polling = 0; 1519 q->u.in.ack_count = 0; 1520 goto set; 1521 } 1522 q->u.in.ack_start = add_buf(q->u.in.ack_start, diff); 1523 } 1524 else 1525 /* the only ACK will be deleted, so stop polling */ 1526 q->u.in.polling = 0; 1527 } 1528 1529set: 1530 count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count); 1531 atomic_add(count, &q->nr_buf_used); 1532 1533 if (need_siga_in(q)) 1534 return qdio_siga_input(q); 1535 1536 return 0; 1537} 1538 1539/** 1540 * handle_outbound - process filled outbound buffers 1541 * @q: queue containing the buffers 1542 * @callflags: flags 1543 * @bufnr: first buffer to process 1544 * @count: how many buffers are filled 1545 */ 1546static int handle_outbound(struct qdio_q *q, unsigned int callflags, 1547 int bufnr, int count) 1548{ 1549 unsigned char state = 0; 1550 int used, rc = 0; 1551 1552 qperf_inc(q, outbound_call); 1553 1554 count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count); 1555 used = atomic_add_return(count, &q->nr_buf_used); 1556 1557 if (used == QDIO_MAX_BUFFERS_PER_Q) 1558 qperf_inc(q, outbound_queue_full); 1559 1560 if (callflags & QDIO_FLAG_PCI_OUT) { 1561 q->u.out.pci_out_enabled = 1; 1562 qperf_inc(q, pci_request_int); 1563 } else 1564 q->u.out.pci_out_enabled = 0; 1565 1566 if (queue_type(q) == QDIO_IQDIO_QFMT) { 1567 unsigned long phys_aob = 0; 1568 1569 /* One SIGA-W per buffer required for unicast HSI */ 1570 WARN_ON_ONCE(count > 1 && !multicast_outbound(q)); 1571 1572 phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr); 1573 1574 rc = qdio_kick_outbound_q(q, phys_aob); 1575 } else if (need_siga_sync(q)) { 1576 rc = qdio_siga_sync_q(q); 1577 } else { 1578 /* try to fast requeue buffers */ 1579 get_buf_state(q, prev_buf(bufnr), &state, 0); 1580 if (state != SLSB_CU_OUTPUT_PRIMED) 1581 rc = qdio_kick_outbound_q(q, 0); 1582 else 1583 qperf_inc(q, fast_requeue); 1584 } 1585 1586 /* in case of SIGA errors we must process the error immediately */ 1587 if (used >= q->u.out.scan_threshold || rc) 1588 tasklet_schedule(&q->tasklet); 1589 else 1590 /* free the SBALs in case of no further traffic */ 1591 if (!timer_pending(&q->u.out.timer)) 1592 mod_timer(&q->u.out.timer, jiffies + HZ); 1593 return rc; 1594} 1595 1596/** 1597 * do_QDIO - process input or output buffers 1598 * @cdev: associated ccw_device for the qdio subchannel 1599 * @callflags: input or output and special flags from the program 1600 * @q_nr: queue number 1601 * @bufnr: buffer number 1602 * @count: how many buffers to process 1603 */ 1604int do_QDIO(struct ccw_device *cdev, unsigned int callflags, 1605 int q_nr, unsigned int bufnr, unsigned int count) 1606{ 1607 struct qdio_irq *irq_ptr; 1608 1609 if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q) 1610 return -EINVAL; 1611 1612 irq_ptr = cdev->private->qdio_data; 1613 if (!irq_ptr) 1614 return -ENODEV; 1615 1616 DBF_DEV_EVENT(DBF_INFO, irq_ptr, 1617 "do%02x b:%02x c:%02x", callflags, bufnr, count); 1618 1619 if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE) 1620 return -EIO; 1621 if (!count) 1622 return 0; 1623 if (callflags & QDIO_FLAG_SYNC_INPUT) 1624 return handle_inbound(irq_ptr->input_qs[q_nr], 1625 callflags, bufnr, count); 1626 else if (callflags & QDIO_FLAG_SYNC_OUTPUT) 1627 return handle_outbound(irq_ptr->output_qs[q_nr], 1628 callflags, bufnr, count); 1629 return -EINVAL; 1630} 1631EXPORT_SYMBOL_GPL(do_QDIO); 1632 1633/** 1634 * qdio_start_irq - process input buffers 1635 * @cdev: associated ccw_device for the qdio subchannel 1636 * @nr: input queue number 1637 * 1638 * Return codes 1639 * 0 - success 1640 * 1 - irqs not started since new data is available 1641 */ 1642int qdio_start_irq(struct ccw_device *cdev, int nr) 1643{ 1644 struct qdio_q *q; 1645 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1646 1647 if (!irq_ptr) 1648 return -ENODEV; 1649 q = irq_ptr->input_qs[nr]; 1650 1651 clear_nonshared_ind(irq_ptr); 1652 qdio_stop_polling(q); 1653 clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state); 1654 1655 /* 1656 * We need to check again to not lose initiative after 1657 * resetting the ACK state. 1658 */ 1659 if (test_nonshared_ind(irq_ptr)) 1660 goto rescan; 1661 if (!qdio_inbound_q_done(q)) 1662 goto rescan; 1663 return 0; 1664 1665rescan: 1666 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, 1667 &q->u.in.queue_irq_state)) 1668 return 0; 1669 else 1670 return 1; 1671 1672} 1673EXPORT_SYMBOL(qdio_start_irq); 1674 1675/** 1676 * qdio_get_next_buffers - process input buffers 1677 * @cdev: associated ccw_device for the qdio subchannel 1678 * @nr: input queue number 1679 * @bufnr: first filled buffer number 1680 * @error: buffers are in error state 1681 * 1682 * Return codes 1683 * < 0 - error 1684 * = 0 - no new buffers found 1685 * > 0 - number of processed buffers 1686 */ 1687int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr, 1688 int *error) 1689{ 1690 struct qdio_q *q; 1691 int start, end; 1692 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1693 1694 if (!irq_ptr) 1695 return -ENODEV; 1696 q = irq_ptr->input_qs[nr]; 1697 1698 /* 1699 * Cannot rely on automatic sync after interrupt since queues may 1700 * also be examined without interrupt. 1701 */ 1702 if (need_siga_sync(q)) 1703 qdio_sync_queues(q); 1704 1705 /* check the PCI capable outbound queues. */ 1706 qdio_check_outbound_after_thinint(q); 1707 1708 if (!qdio_inbound_q_moved(q)) 1709 return 0; 1710 1711 /* Note: upper-layer MUST stop processing immediately here ... */ 1712 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) 1713 return -EIO; 1714 1715 start = q->first_to_kick; 1716 end = q->first_to_check; 1717 *bufnr = start; 1718 *error = q->qdio_error; 1719 1720 /* for the next time */ 1721 q->first_to_kick = end; 1722 q->qdio_error = 0; 1723 return sub_buf(end, start); 1724} 1725EXPORT_SYMBOL(qdio_get_next_buffers); 1726 1727/** 1728 * qdio_stop_irq - disable interrupt processing for the device 1729 * @cdev: associated ccw_device for the qdio subchannel 1730 * @nr: input queue number 1731 * 1732 * Return codes 1733 * 0 - interrupts were already disabled 1734 * 1 - interrupts successfully disabled 1735 */ 1736int qdio_stop_irq(struct ccw_device *cdev, int nr) 1737{ 1738 struct qdio_q *q; 1739 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1740 1741 if (!irq_ptr) 1742 return -ENODEV; 1743 q = irq_ptr->input_qs[nr]; 1744 1745 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, 1746 &q->u.in.queue_irq_state)) 1747 return 0; 1748 else 1749 return 1; 1750} 1751EXPORT_SYMBOL(qdio_stop_irq); 1752 1753/** 1754 * qdio_pnso_brinfo() - perform network subchannel op #0 - bridge info. 1755 * @schid: Subchannel ID. 1756 * @cnc: Boolean Change-Notification Control 1757 * @response: Response code will be stored at this address 1758 * @cb: Callback function will be executed for each element 1759 * of the address list 1760 * @priv: Pointer passed from the caller to qdio_pnso_brinfo() 1761 * @type: Type of the address entry passed to the callback 1762 * @entry: Entry containg the address of the specified type 1763 * @priv: Pointer to pass to the callback function. 1764 * 1765 * Performs "Store-network-bridging-information list" operation and calls 1766 * the callback function for every entry in the list. If "change- 1767 * notification-control" is set, further changes in the address list 1768 * will be reported via the IPA command. 1769 */ 1770int qdio_pnso_brinfo(struct subchannel_id schid, 1771 int cnc, u16 *response, 1772 void (*cb)(void *priv, enum qdio_brinfo_entry_type type, 1773 void *entry), 1774 void *priv) 1775{ 1776 struct chsc_pnso_area *rr; 1777 int rc; 1778 u32 prev_instance = 0; 1779 int isfirstblock = 1; 1780 int i, size, elems; 1781 1782 rr = (struct chsc_pnso_area *)get_zeroed_page(GFP_KERNEL); 1783 if (rr == NULL) 1784 return -ENOMEM; 1785 do { 1786 /* on the first iteration, naihdr.resume_token will be zero */ 1787 rc = chsc_pnso_brinfo(schid, rr, rr->naihdr.resume_token, cnc); 1788 if (rc != 0 && rc != -EBUSY) 1789 goto out; 1790 if (rr->response.code != 1) { 1791 rc = -EIO; 1792 continue; 1793 } else 1794 rc = 0; 1795 1796 if (cb == NULL) 1797 continue; 1798 1799 size = rr->naihdr.naids; 1800 elems = (rr->response.length - 1801 sizeof(struct chsc_header) - 1802 sizeof(struct chsc_brinfo_naihdr)) / 1803 size; 1804 1805 if (!isfirstblock && (rr->naihdr.instance != prev_instance)) { 1806 /* Inform the caller that they need to scrap */ 1807 /* the data that was already reported via cb */ 1808 rc = -EAGAIN; 1809 break; 1810 } 1811 isfirstblock = 0; 1812 prev_instance = rr->naihdr.instance; 1813 for (i = 0; i < elems; i++) 1814 switch (size) { 1815 case sizeof(struct qdio_brinfo_entry_l3_ipv6): 1816 (*cb)(priv, l3_ipv6_addr, 1817 &rr->entries.l3_ipv6[i]); 1818 break; 1819 case sizeof(struct qdio_brinfo_entry_l3_ipv4): 1820 (*cb)(priv, l3_ipv4_addr, 1821 &rr->entries.l3_ipv4[i]); 1822 break; 1823 case sizeof(struct qdio_brinfo_entry_l2): 1824 (*cb)(priv, l2_addr_lnid, 1825 &rr->entries.l2[i]); 1826 break; 1827 default: 1828 WARN_ON_ONCE(1); 1829 rc = -EIO; 1830 goto out; 1831 } 1832 } while (rr->response.code == 0x0107 || /* channel busy */ 1833 (rr->response.code == 1 && /* list stored */ 1834 /* resume token is non-zero => list incomplete */ 1835 (rr->naihdr.resume_token.t1 || rr->naihdr.resume_token.t2))); 1836 (*response) = rr->response.code; 1837 1838out: 1839 free_page((unsigned long)rr); 1840 return rc; 1841} 1842EXPORT_SYMBOL_GPL(qdio_pnso_brinfo); 1843 1844static int __init init_QDIO(void) 1845{ 1846 int rc; 1847 1848 rc = qdio_debug_init(); 1849 if (rc) 1850 return rc; 1851 rc = qdio_setup_init(); 1852 if (rc) 1853 goto out_debug; 1854 rc = tiqdio_allocate_memory(); 1855 if (rc) 1856 goto out_cache; 1857 rc = tiqdio_register_thinints(); 1858 if (rc) 1859 goto out_ti; 1860 return 0; 1861 1862out_ti: 1863 tiqdio_free_memory(); 1864out_cache: 1865 qdio_setup_exit(); 1866out_debug: 1867 qdio_debug_exit(); 1868 return rc; 1869} 1870 1871static void __exit exit_QDIO(void) 1872{ 1873 tiqdio_unregister_thinints(); 1874 tiqdio_free_memory(); 1875 qdio_setup_exit(); 1876 qdio_debug_exit(); 1877} 1878 1879module_init(init_QDIO); 1880module_exit(exit_QDIO); 1881