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