1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Linux for s390 qdio support, buffer handling, qdio API and module support. 4 * 5 * Copyright IBM Corp. 2000, 2008 6 * Author(s): Utz Bacher <utz.bacher@de.ibm.com> 7 * Jan Glauber <jang@linux.vnet.ibm.com> 8 * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com> 9 */ 10 #include <linux/module.h> 11 #include <linux/init.h> 12 #include <linux/kernel.h> 13 #include <linux/timer.h> 14 #include <linux/delay.h> 15 #include <linux/gfp.h> 16 #include <linux/io.h> 17 #include <linux/atomic.h> 18 #include <asm/debug.h> 19 #include <asm/qdio.h> 20 #include <asm/ipl.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"); 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 * @aob: asynchronous operation block 76 * 77 * Returns condition code. 78 * Note: For IQDC unicast queues only the highest priority queue is processed. 79 */ 80 static inline int do_siga_output(unsigned long schid, unsigned long mask, 81 unsigned int *bb, unsigned int fc, 82 unsigned long aob) 83 { 84 register unsigned long __fc asm("0") = fc; 85 register unsigned long __schid asm("1") = schid; 86 register unsigned long __mask asm("2") = mask; 87 register unsigned long __aob asm("3") = aob; 88 int cc; 89 90 asm volatile( 91 " siga 0\n" 92 " ipm %0\n" 93 " srl %0,28\n" 94 : "=d" (cc), "+d" (__fc), "+d" (__aob) 95 : "d" (__schid), "d" (__mask) 96 : "cc"); 97 *bb = __fc >> 31; 98 return cc; 99 } 100 101 /** 102 * qdio_do_eqbs - extract buffer states for QEBSM 103 * @q: queue to manipulate 104 * @state: state of the extracted buffers 105 * @start: buffer number to start at 106 * @count: count of buffers to examine 107 * @auto_ack: automatically acknowledge buffers 108 * 109 * Returns the number of successfully extracted equal buffer states. 110 * Stops processing if a state is different from the last buffers state. 111 */ 112 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state, 113 int start, int count, int auto_ack) 114 { 115 int tmp_count = count, tmp_start = start, nr = q->nr; 116 unsigned int ccq = 0; 117 118 qperf_inc(q, eqbs); 119 120 if (!q->is_input_q) 121 nr += q->irq_ptr->nr_input_qs; 122 again: 123 ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count, 124 auto_ack); 125 126 switch (ccq) { 127 case 0: 128 case 32: 129 /* all done, or next buffer state different */ 130 return count - tmp_count; 131 case 96: 132 /* not all buffers processed */ 133 qperf_inc(q, eqbs_partial); 134 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x", 135 tmp_count); 136 return count - tmp_count; 137 case 97: 138 /* no buffer processed */ 139 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq); 140 goto again; 141 default: 142 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq); 143 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q)); 144 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); 145 q->handler(q->irq_ptr->cdev, QDIO_ERROR_GET_BUF_STATE, q->nr, 146 q->first_to_kick, count, q->irq_ptr->int_parm); 147 return 0; 148 } 149 } 150 151 /** 152 * qdio_do_sqbs - set buffer states for QEBSM 153 * @q: queue to manipulate 154 * @state: new state of the buffers 155 * @start: first buffer number to change 156 * @count: how many buffers to change 157 * 158 * Returns the number of successfully changed buffers. 159 * Does retrying until the specified count of buffer states is set or an 160 * error occurs. 161 */ 162 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start, 163 int count) 164 { 165 unsigned int ccq = 0; 166 int tmp_count = count, tmp_start = start; 167 int nr = q->nr; 168 169 if (!count) 170 return 0; 171 qperf_inc(q, sqbs); 172 173 if (!q->is_input_q) 174 nr += q->irq_ptr->nr_input_qs; 175 again: 176 ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count); 177 178 switch (ccq) { 179 case 0: 180 case 32: 181 /* all done, or active buffer adapter-owned */ 182 WARN_ON_ONCE(tmp_count); 183 return count - tmp_count; 184 case 96: 185 /* not all buffers processed */ 186 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq); 187 qperf_inc(q, sqbs_partial); 188 goto again; 189 default: 190 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq); 191 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q)); 192 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); 193 q->handler(q->irq_ptr->cdev, QDIO_ERROR_SET_BUF_STATE, q->nr, 194 q->first_to_kick, count, q->irq_ptr->int_parm); 195 return 0; 196 } 197 } 198 199 /* 200 * Returns number of examined buffers and their common state in *state. 201 * Requested number of buffers-to-examine must be > 0. 202 */ 203 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr, 204 unsigned char *state, unsigned int count, 205 int auto_ack, int merge_pending) 206 { 207 unsigned char __state = 0; 208 int i = 1; 209 210 if (is_qebsm(q)) 211 return qdio_do_eqbs(q, state, bufnr, count, auto_ack); 212 213 /* get initial state: */ 214 __state = q->slsb.val[bufnr]; 215 216 /* Bail out early if there is no work on the queue: */ 217 if (__state & SLSB_OWNER_CU) 218 goto out; 219 220 if (merge_pending && __state == SLSB_P_OUTPUT_PENDING) 221 __state = SLSB_P_OUTPUT_EMPTY; 222 223 for (; i < count; i++) { 224 bufnr = next_buf(bufnr); 225 226 /* merge PENDING into EMPTY: */ 227 if (merge_pending && 228 q->slsb.val[bufnr] == SLSB_P_OUTPUT_PENDING && 229 __state == SLSB_P_OUTPUT_EMPTY) 230 continue; 231 232 /* stop if next state differs from initial state: */ 233 if (q->slsb.val[bufnr] != __state) 234 break; 235 } 236 237 out: 238 *state = __state; 239 return i; 240 } 241 242 static 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 */ 249 static 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 } 263 264 static 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 */ 271 static 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 } 283 284 static 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 } 304 305 static 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 } 312 313 static 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 WARN_ON_ONCE(aob && ((queue_type(q) != QDIO_IQDIO_QFMT) || 323 !q->u.out.use_cq)); 324 if (q->u.out.use_cq && aob != 0) { 325 fc = QDIO_SIGA_WRITEQ; 326 laob = aob; 327 } 328 329 if (is_qebsm(q)) { 330 schid = q->irq_ptr->sch_token; 331 fc |= QDIO_SIGA_QEBSM_FLAG; 332 } 333 again: 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 } 354 355 static 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) 377 378 static 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->irq_ptr)) 382 qdio_siga_sync_all(q); 383 else 384 qdio_siga_sync_q(q); 385 } 386 387 int 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_state(q, bufnr, state, 0); 393 } 394 395 static 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 } 411 412 static 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 } 424 425 static void process_buffer_error(struct qdio_q *q, unsigned int start, 426 int count) 427 { 428 unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT : 429 SLSB_P_OUTPUT_NOT_INIT; 430 431 q->qdio_error = QDIO_ERROR_SLSB_STATE; 432 433 /* special handling for no target buffer empty */ 434 if (queue_type(q) == QDIO_IQDIO_QFMT && !q->is_input_q && 435 q->sbal[start]->element[15].sflags == 0x10) { 436 qperf_inc(q, target_full); 437 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", start); 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", start, count); 444 DBF_ERROR("F14:%2x F15:%2x", 445 q->sbal[start]->element[14].sflags, 446 q->sbal[start]->element[15].sflags); 447 448 set: 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, start, state, count); 454 } 455 456 static inline void inbound_primed(struct qdio_q *q, unsigned int start, 457 int count) 458 { 459 int new; 460 461 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr, count); 462 463 /* for QEBSM the ACK was already set by EQBS */ 464 if (is_qebsm(q)) { 465 if (!q->u.in.polling) { 466 q->u.in.polling = 1; 467 q->u.in.ack_count = count; 468 q->u.in.ack_start = start; 469 return; 470 } 471 472 /* delete the previous ACK's */ 473 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, 474 q->u.in.ack_count); 475 q->u.in.ack_count = count; 476 q->u.in.ack_start = start; 477 return; 478 } 479 480 /* 481 * ACK the newest buffer. The ACK will be removed in qdio_stop_polling 482 * or by the next inbound run. 483 */ 484 new = add_buf(start, count - 1); 485 if (q->u.in.polling) { 486 /* reset the previous ACK but first set the new one */ 487 set_buf_state(q, new, SLSB_P_INPUT_ACK); 488 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); 489 } else { 490 q->u.in.polling = 1; 491 set_buf_state(q, new, SLSB_P_INPUT_ACK); 492 } 493 494 q->u.in.ack_start = new; 495 count--; 496 if (!count) 497 return; 498 /* need to change ALL buffers to get more interrupts */ 499 set_buf_states(q, start, SLSB_P_INPUT_NOT_INIT, count); 500 } 501 502 static int get_inbound_buffer_frontier(struct qdio_q *q, unsigned int start) 503 { 504 unsigned char state = 0; 505 int count; 506 507 q->timestamp = get_tod_clock_fast(); 508 509 /* 510 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved 511 * would return 0. 512 */ 513 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); 514 if (!count) 515 return 0; 516 517 /* 518 * No siga sync here, as a PCI or we after a thin interrupt 519 * already sync'ed the queues. 520 */ 521 count = get_buf_states(q, start, &state, count, 1, 0); 522 if (!count) 523 return 0; 524 525 switch (state) { 526 case SLSB_P_INPUT_PRIMED: 527 inbound_primed(q, start, count); 528 if (atomic_sub_return(count, &q->nr_buf_used) == 0) 529 qperf_inc(q, inbound_queue_full); 530 if (q->irq_ptr->perf_stat_enabled) 531 account_sbals(q, count); 532 return count; 533 case SLSB_P_INPUT_ERROR: 534 process_buffer_error(q, start, count); 535 if (atomic_sub_return(count, &q->nr_buf_used) == 0) 536 qperf_inc(q, inbound_queue_full); 537 if (q->irq_ptr->perf_stat_enabled) 538 account_sbals_error(q, count); 539 return count; 540 case SLSB_CU_INPUT_EMPTY: 541 case SLSB_P_INPUT_NOT_INIT: 542 case SLSB_P_INPUT_ACK: 543 if (q->irq_ptr->perf_stat_enabled) 544 q->q_stats.nr_sbal_nop++; 545 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x", 546 q->nr, start); 547 return 0; 548 default: 549 WARN_ON_ONCE(1); 550 return 0; 551 } 552 } 553 554 static int qdio_inbound_q_moved(struct qdio_q *q, unsigned int start) 555 { 556 int count; 557 558 count = get_inbound_buffer_frontier(q, start); 559 560 if (count && !is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR) 561 q->u.in.timestamp = get_tod_clock(); 562 563 return count; 564 } 565 566 static inline int qdio_inbound_q_done(struct qdio_q *q, unsigned int start) 567 { 568 unsigned char state = 0; 569 570 if (!atomic_read(&q->nr_buf_used)) 571 return 1; 572 573 if (need_siga_sync(q)) 574 qdio_siga_sync_q(q); 575 get_buf_state(q, start, &state, 0); 576 577 if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR) 578 /* more work coming */ 579 return 0; 580 581 if (is_thinint_irq(q->irq_ptr)) 582 return 1; 583 584 /* don't poll under z/VM */ 585 if (MACHINE_IS_VM) 586 return 1; 587 588 /* 589 * At this point we know, that inbound first_to_check 590 * has (probably) not moved (see qdio_inbound_processing). 591 */ 592 if (get_tod_clock_fast() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) { 593 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x", start); 594 return 1; 595 } else 596 return 0; 597 } 598 599 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count) 600 { 601 unsigned char state = 0; 602 int j, b = start; 603 604 for (j = 0; j < count; ++j) { 605 get_buf_state(q, b, &state, 0); 606 if (state == SLSB_P_OUTPUT_PENDING) { 607 struct qaob *aob = q->u.out.aobs[b]; 608 if (aob == NULL) 609 continue; 610 611 q->u.out.sbal_state[b].flags |= 612 QDIO_OUTBUF_STATE_FLAG_PENDING; 613 q->u.out.aobs[b] = NULL; 614 } 615 b = next_buf(b); 616 } 617 } 618 619 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q, 620 int bufnr) 621 { 622 unsigned long phys_aob = 0; 623 624 if (!q->use_cq) 625 return 0; 626 627 if (!q->aobs[bufnr]) { 628 struct qaob *aob = qdio_allocate_aob(); 629 q->aobs[bufnr] = aob; 630 } 631 if (q->aobs[bufnr]) { 632 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user; 633 phys_aob = virt_to_phys(q->aobs[bufnr]); 634 WARN_ON_ONCE(phys_aob & 0xFF); 635 } 636 637 q->sbal_state[bufnr].flags = 0; 638 return phys_aob; 639 } 640 641 static void qdio_kick_handler(struct qdio_q *q, unsigned int count) 642 { 643 int start = q->first_to_kick; 644 645 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) 646 return; 647 648 if (q->is_input_q) { 649 qperf_inc(q, inbound_handler); 650 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count); 651 } else { 652 qperf_inc(q, outbound_handler); 653 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x", 654 start, count); 655 if (q->u.out.use_cq) 656 qdio_handle_aobs(q, start, count); 657 } 658 659 q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count, 660 q->irq_ptr->int_parm); 661 662 /* for the next time */ 663 q->first_to_kick = add_buf(start, count); 664 q->qdio_error = 0; 665 } 666 667 static inline int qdio_tasklet_schedule(struct qdio_q *q) 668 { 669 if (likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) { 670 tasklet_schedule(&q->tasklet); 671 return 0; 672 } 673 return -EPERM; 674 } 675 676 static void __qdio_inbound_processing(struct qdio_q *q) 677 { 678 unsigned int start = q->first_to_check; 679 int count; 680 681 qperf_inc(q, tasklet_inbound); 682 683 count = qdio_inbound_q_moved(q, start); 684 if (count == 0) 685 return; 686 687 start = add_buf(start, count); 688 q->first_to_check = start; 689 qdio_kick_handler(q, count); 690 691 if (!qdio_inbound_q_done(q, start)) { 692 /* means poll time is not yet over */ 693 qperf_inc(q, tasklet_inbound_resched); 694 if (!qdio_tasklet_schedule(q)) 695 return; 696 } 697 698 qdio_stop_polling(q); 699 /* 700 * We need to check again to not lose initiative after 701 * resetting the ACK state. 702 */ 703 if (!qdio_inbound_q_done(q, start)) { 704 qperf_inc(q, tasklet_inbound_resched2); 705 qdio_tasklet_schedule(q); 706 } 707 } 708 709 void qdio_inbound_processing(unsigned long data) 710 { 711 struct qdio_q *q = (struct qdio_q *)data; 712 __qdio_inbound_processing(q); 713 } 714 715 static int get_outbound_buffer_frontier(struct qdio_q *q, unsigned int start) 716 { 717 unsigned char state = 0; 718 int count; 719 720 q->timestamp = get_tod_clock_fast(); 721 722 if (need_siga_sync(q)) 723 if (((queue_type(q) != QDIO_IQDIO_QFMT) && 724 !pci_out_supported(q->irq_ptr)) || 725 (queue_type(q) == QDIO_IQDIO_QFMT && 726 multicast_outbound(q))) 727 qdio_siga_sync_q(q); 728 729 count = atomic_read(&q->nr_buf_used); 730 if (!count) 731 return 0; 732 733 count = get_buf_states(q, start, &state, count, 0, q->u.out.use_cq); 734 if (!count) 735 return 0; 736 737 switch (state) { 738 case SLSB_P_OUTPUT_EMPTY: 739 case SLSB_P_OUTPUT_PENDING: 740 /* the adapter got it */ 741 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, 742 "out empty:%1d %02x", q->nr, count); 743 744 atomic_sub(count, &q->nr_buf_used); 745 if (q->irq_ptr->perf_stat_enabled) 746 account_sbals(q, count); 747 return count; 748 case SLSB_P_OUTPUT_ERROR: 749 process_buffer_error(q, start, count); 750 atomic_sub(count, &q->nr_buf_used); 751 if (q->irq_ptr->perf_stat_enabled) 752 account_sbals_error(q, count); 753 return count; 754 case SLSB_CU_OUTPUT_PRIMED: 755 /* the adapter has not fetched the output yet */ 756 if (q->irq_ptr->perf_stat_enabled) 757 q->q_stats.nr_sbal_nop++; 758 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", 759 q->nr); 760 return 0; 761 case SLSB_P_OUTPUT_NOT_INIT: 762 case SLSB_P_OUTPUT_HALTED: 763 return 0; 764 default: 765 WARN_ON_ONCE(1); 766 return 0; 767 } 768 } 769 770 /* all buffers processed? */ 771 static inline int qdio_outbound_q_done(struct qdio_q *q) 772 { 773 return atomic_read(&q->nr_buf_used) == 0; 774 } 775 776 static inline int qdio_outbound_q_moved(struct qdio_q *q, unsigned int start) 777 { 778 int count; 779 780 count = get_outbound_buffer_frontier(q, start); 781 782 if (count) 783 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr); 784 785 return count; 786 } 787 788 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob) 789 { 790 int retries = 0, cc; 791 unsigned int busy_bit; 792 793 if (!need_siga_out(q)) 794 return 0; 795 796 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr); 797 retry: 798 qperf_inc(q, siga_write); 799 800 cc = qdio_siga_output(q, &busy_bit, aob); 801 switch (cc) { 802 case 0: 803 break; 804 case 2: 805 if (busy_bit) { 806 while (++retries < QDIO_BUSY_BIT_RETRIES) { 807 mdelay(QDIO_BUSY_BIT_RETRY_DELAY); 808 goto retry; 809 } 810 DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr); 811 cc = -EBUSY; 812 } else { 813 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr); 814 cc = -ENOBUFS; 815 } 816 break; 817 case 1: 818 case 3: 819 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc); 820 cc = -EIO; 821 break; 822 } 823 if (retries) { 824 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr); 825 DBF_ERROR("count:%u", retries); 826 } 827 return cc; 828 } 829 830 static void __qdio_outbound_processing(struct qdio_q *q) 831 { 832 unsigned int start = q->first_to_check; 833 int count; 834 835 qperf_inc(q, tasklet_outbound); 836 WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0); 837 838 count = qdio_outbound_q_moved(q, start); 839 if (count) { 840 q->first_to_check = add_buf(start, count); 841 qdio_kick_handler(q, count); 842 } 843 844 if (queue_type(q) == QDIO_ZFCP_QFMT && !pci_out_supported(q->irq_ptr) && 845 !qdio_outbound_q_done(q)) 846 goto sched; 847 848 if (q->u.out.pci_out_enabled) 849 return; 850 851 /* 852 * Now we know that queue type is either qeth without pci enabled 853 * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY 854 * is noticed and outbound_handler is called after some time. 855 */ 856 if (qdio_outbound_q_done(q)) 857 del_timer_sync(&q->u.out.timer); 858 else 859 if (!timer_pending(&q->u.out.timer) && 860 likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) 861 mod_timer(&q->u.out.timer, jiffies + 10 * HZ); 862 return; 863 864 sched: 865 qdio_tasklet_schedule(q); 866 } 867 868 /* outbound tasklet */ 869 void qdio_outbound_processing(unsigned long data) 870 { 871 struct qdio_q *q = (struct qdio_q *)data; 872 __qdio_outbound_processing(q); 873 } 874 875 void qdio_outbound_timer(struct timer_list *t) 876 { 877 struct qdio_q *q = from_timer(q, t, u.out.timer); 878 879 qdio_tasklet_schedule(q); 880 } 881 882 static inline void qdio_check_outbound_pci_queues(struct qdio_irq *irq) 883 { 884 struct qdio_q *out; 885 int i; 886 887 if (!pci_out_supported(irq)) 888 return; 889 890 for_each_output_queue(irq, out, i) 891 if (!qdio_outbound_q_done(out)) 892 qdio_tasklet_schedule(out); 893 } 894 895 static void __tiqdio_inbound_processing(struct qdio_q *q) 896 { 897 unsigned int start = q->first_to_check; 898 int count; 899 900 qperf_inc(q, tasklet_inbound); 901 if (need_siga_sync(q) && need_siga_sync_after_ai(q)) 902 qdio_sync_queues(q); 903 904 /* The interrupt could be caused by a PCI request: */ 905 qdio_check_outbound_pci_queues(q->irq_ptr); 906 907 count = qdio_inbound_q_moved(q, start); 908 if (count == 0) 909 return; 910 911 start = add_buf(start, count); 912 q->first_to_check = start; 913 qdio_kick_handler(q, count); 914 915 if (!qdio_inbound_q_done(q, start)) { 916 qperf_inc(q, tasklet_inbound_resched); 917 if (!qdio_tasklet_schedule(q)) 918 return; 919 } 920 921 qdio_stop_polling(q); 922 /* 923 * We need to check again to not lose initiative after 924 * resetting the ACK state. 925 */ 926 if (!qdio_inbound_q_done(q, start)) { 927 qperf_inc(q, tasklet_inbound_resched2); 928 qdio_tasklet_schedule(q); 929 } 930 } 931 932 void tiqdio_inbound_processing(unsigned long data) 933 { 934 struct qdio_q *q = (struct qdio_q *)data; 935 __tiqdio_inbound_processing(q); 936 } 937 938 static inline void qdio_set_state(struct qdio_irq *irq_ptr, 939 enum qdio_irq_states state) 940 { 941 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state); 942 943 irq_ptr->state = state; 944 mb(); 945 } 946 947 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb) 948 { 949 if (irb->esw.esw0.erw.cons) { 950 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no); 951 DBF_ERROR_HEX(irb, 64); 952 DBF_ERROR_HEX(irb->ecw, 64); 953 } 954 } 955 956 /* PCI interrupt handler */ 957 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr) 958 { 959 int i; 960 struct qdio_q *q; 961 962 if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) 963 return; 964 965 for_each_input_queue(irq_ptr, q, i) { 966 if (q->u.in.queue_start_poll) { 967 /* skip if polling is enabled or already in work */ 968 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, 969 &q->u.in.queue_irq_state)) { 970 qperf_inc(q, int_discarded); 971 continue; 972 } 973 q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr, 974 q->irq_ptr->int_parm); 975 } else { 976 tasklet_schedule(&q->tasklet); 977 } 978 } 979 980 if (!pci_out_supported(irq_ptr)) 981 return; 982 983 for_each_output_queue(irq_ptr, q, i) { 984 if (qdio_outbound_q_done(q)) 985 continue; 986 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q)) 987 qdio_siga_sync_q(q); 988 qdio_tasklet_schedule(q); 989 } 990 } 991 992 static void qdio_handle_activate_check(struct ccw_device *cdev, 993 unsigned long intparm, int cstat, int dstat) 994 { 995 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 996 struct qdio_q *q; 997 int count; 998 999 DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no); 1000 DBF_ERROR("intp :%lx", intparm); 1001 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); 1002 1003 if (irq_ptr->nr_input_qs) { 1004 q = irq_ptr->input_qs[0]; 1005 } else if (irq_ptr->nr_output_qs) { 1006 q = irq_ptr->output_qs[0]; 1007 } else { 1008 dump_stack(); 1009 goto no_handler; 1010 } 1011 1012 count = sub_buf(q->first_to_check, q->first_to_kick); 1013 q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE, 1014 q->nr, q->first_to_kick, count, irq_ptr->int_parm); 1015 no_handler: 1016 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); 1017 /* 1018 * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen. 1019 * Therefore we call the LGR detection function here. 1020 */ 1021 lgr_info_log(); 1022 } 1023 1024 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat, 1025 int dstat) 1026 { 1027 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1028 1029 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq"); 1030 1031 if (cstat) 1032 goto error; 1033 if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END)) 1034 goto error; 1035 if (!(dstat & DEV_STAT_DEV_END)) 1036 goto error; 1037 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED); 1038 return; 1039 1040 error: 1041 DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no); 1042 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); 1043 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); 1044 } 1045 1046 /* qdio interrupt handler */ 1047 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm, 1048 struct irb *irb) 1049 { 1050 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1051 struct subchannel_id schid; 1052 int cstat, dstat; 1053 1054 if (!intparm || !irq_ptr) { 1055 ccw_device_get_schid(cdev, &schid); 1056 DBF_ERROR("qint:%4x", schid.sch_no); 1057 return; 1058 } 1059 1060 if (irq_ptr->perf_stat_enabled) 1061 irq_ptr->perf_stat.qdio_int++; 1062 1063 if (IS_ERR(irb)) { 1064 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no); 1065 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); 1066 wake_up(&cdev->private->wait_q); 1067 return; 1068 } 1069 qdio_irq_check_sense(irq_ptr, irb); 1070 cstat = irb->scsw.cmd.cstat; 1071 dstat = irb->scsw.cmd.dstat; 1072 1073 switch (irq_ptr->state) { 1074 case QDIO_IRQ_STATE_INACTIVE: 1075 qdio_establish_handle_irq(cdev, cstat, dstat); 1076 break; 1077 case QDIO_IRQ_STATE_CLEANUP: 1078 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); 1079 break; 1080 case QDIO_IRQ_STATE_ESTABLISHED: 1081 case QDIO_IRQ_STATE_ACTIVE: 1082 if (cstat & SCHN_STAT_PCI) { 1083 qdio_int_handler_pci(irq_ptr); 1084 return; 1085 } 1086 if (cstat || dstat) 1087 qdio_handle_activate_check(cdev, intparm, cstat, 1088 dstat); 1089 break; 1090 case QDIO_IRQ_STATE_STOPPED: 1091 break; 1092 default: 1093 WARN_ON_ONCE(1); 1094 } 1095 wake_up(&cdev->private->wait_q); 1096 } 1097 1098 /** 1099 * qdio_get_ssqd_desc - get qdio subchannel description 1100 * @cdev: ccw device to get description for 1101 * @data: where to store the ssqd 1102 * 1103 * Returns 0 or an error code. The results of the chsc are stored in the 1104 * specified structure. 1105 */ 1106 int qdio_get_ssqd_desc(struct ccw_device *cdev, 1107 struct qdio_ssqd_desc *data) 1108 { 1109 struct subchannel_id schid; 1110 1111 if (!cdev || !cdev->private) 1112 return -EINVAL; 1113 1114 ccw_device_get_schid(cdev, &schid); 1115 DBF_EVENT("get ssqd:%4x", schid.sch_no); 1116 return qdio_setup_get_ssqd(NULL, &schid, data); 1117 } 1118 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc); 1119 1120 static void qdio_shutdown_queues(struct ccw_device *cdev) 1121 { 1122 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1123 struct qdio_q *q; 1124 int i; 1125 1126 for_each_input_queue(irq_ptr, q, i) 1127 tasklet_kill(&q->tasklet); 1128 1129 for_each_output_queue(irq_ptr, q, i) { 1130 del_timer_sync(&q->u.out.timer); 1131 tasklet_kill(&q->tasklet); 1132 } 1133 } 1134 1135 /** 1136 * qdio_shutdown - shut down a qdio subchannel 1137 * @cdev: associated ccw device 1138 * @how: use halt or clear to shutdown 1139 */ 1140 int qdio_shutdown(struct ccw_device *cdev, int how) 1141 { 1142 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1143 struct subchannel_id schid; 1144 int rc; 1145 1146 if (!irq_ptr) 1147 return -ENODEV; 1148 1149 WARN_ON_ONCE(irqs_disabled()); 1150 ccw_device_get_schid(cdev, &schid); 1151 DBF_EVENT("qshutdown:%4x", schid.sch_no); 1152 1153 mutex_lock(&irq_ptr->setup_mutex); 1154 /* 1155 * Subchannel was already shot down. We cannot prevent being called 1156 * twice since cio may trigger a shutdown asynchronously. 1157 */ 1158 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { 1159 mutex_unlock(&irq_ptr->setup_mutex); 1160 return 0; 1161 } 1162 1163 /* 1164 * Indicate that the device is going down. Scheduling the queue 1165 * tasklets is forbidden from here on. 1166 */ 1167 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); 1168 1169 tiqdio_remove_input_queues(irq_ptr); 1170 qdio_shutdown_queues(cdev); 1171 qdio_shutdown_debug_entries(irq_ptr); 1172 1173 /* cleanup subchannel */ 1174 spin_lock_irq(get_ccwdev_lock(cdev)); 1175 1176 if (how & QDIO_FLAG_CLEANUP_USING_CLEAR) 1177 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP); 1178 else 1179 /* default behaviour is halt */ 1180 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP); 1181 if (rc) { 1182 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no); 1183 DBF_ERROR("rc:%4d", rc); 1184 goto no_cleanup; 1185 } 1186 1187 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP); 1188 spin_unlock_irq(get_ccwdev_lock(cdev)); 1189 wait_event_interruptible_timeout(cdev->private->wait_q, 1190 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE || 1191 irq_ptr->state == QDIO_IRQ_STATE_ERR, 1192 10 * HZ); 1193 spin_lock_irq(get_ccwdev_lock(cdev)); 1194 1195 no_cleanup: 1196 qdio_shutdown_thinint(irq_ptr); 1197 1198 /* restore interrupt handler */ 1199 if ((void *)cdev->handler == (void *)qdio_int_handler) { 1200 cdev->handler = irq_ptr->orig_handler; 1201 cdev->private->intparm = 0; 1202 } 1203 spin_unlock_irq(get_ccwdev_lock(cdev)); 1204 1205 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); 1206 mutex_unlock(&irq_ptr->setup_mutex); 1207 if (rc) 1208 return rc; 1209 return 0; 1210 } 1211 EXPORT_SYMBOL_GPL(qdio_shutdown); 1212 1213 /** 1214 * qdio_free - free data structures for a qdio subchannel 1215 * @cdev: associated ccw device 1216 */ 1217 int qdio_free(struct ccw_device *cdev) 1218 { 1219 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1220 struct subchannel_id schid; 1221 1222 if (!irq_ptr) 1223 return -ENODEV; 1224 1225 ccw_device_get_schid(cdev, &schid); 1226 DBF_EVENT("qfree:%4x", schid.sch_no); 1227 DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned"); 1228 mutex_lock(&irq_ptr->setup_mutex); 1229 1230 irq_ptr->debug_area = NULL; 1231 cdev->private->qdio_data = NULL; 1232 mutex_unlock(&irq_ptr->setup_mutex); 1233 1234 qdio_release_memory(irq_ptr); 1235 return 0; 1236 } 1237 EXPORT_SYMBOL_GPL(qdio_free); 1238 1239 /** 1240 * qdio_allocate - allocate qdio queues and associated data 1241 * @init_data: initialization data 1242 */ 1243 int qdio_allocate(struct qdio_initialize *init_data) 1244 { 1245 struct subchannel_id schid; 1246 struct qdio_irq *irq_ptr; 1247 1248 ccw_device_get_schid(init_data->cdev, &schid); 1249 DBF_EVENT("qallocate:%4x", schid.sch_no); 1250 1251 if ((init_data->no_input_qs && !init_data->input_handler) || 1252 (init_data->no_output_qs && !init_data->output_handler)) 1253 return -EINVAL; 1254 1255 if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) || 1256 (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)) 1257 return -EINVAL; 1258 1259 if ((!init_data->input_sbal_addr_array) || 1260 (!init_data->output_sbal_addr_array)) 1261 return -EINVAL; 1262 1263 /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */ 1264 irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 1265 if (!irq_ptr) 1266 goto out_err; 1267 1268 mutex_init(&irq_ptr->setup_mutex); 1269 if (qdio_allocate_dbf(init_data, irq_ptr)) 1270 goto out_rel; 1271 1272 /* 1273 * Allocate a page for the chsc calls in qdio_establish. 1274 * Must be pre-allocated since a zfcp recovery will call 1275 * qdio_establish. In case of low memory and swap on a zfcp disk 1276 * we may not be able to allocate memory otherwise. 1277 */ 1278 irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL); 1279 if (!irq_ptr->chsc_page) 1280 goto out_rel; 1281 1282 /* qdr is used in ccw1.cda which is u32 */ 1283 irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 1284 if (!irq_ptr->qdr) 1285 goto out_rel; 1286 1287 if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs, 1288 init_data->no_output_qs)) 1289 goto out_rel; 1290 1291 init_data->cdev->private->qdio_data = irq_ptr; 1292 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); 1293 return 0; 1294 out_rel: 1295 qdio_release_memory(irq_ptr); 1296 out_err: 1297 return -ENOMEM; 1298 } 1299 EXPORT_SYMBOL_GPL(qdio_allocate); 1300 1301 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr) 1302 { 1303 struct qdio_q *q = irq_ptr->input_qs[0]; 1304 int i, use_cq = 0; 1305 1306 if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT) 1307 use_cq = 1; 1308 1309 for_each_output_queue(irq_ptr, q, i) { 1310 if (use_cq) { 1311 if (qdio_enable_async_operation(&q->u.out) < 0) { 1312 use_cq = 0; 1313 continue; 1314 } 1315 } else 1316 qdio_disable_async_operation(&q->u.out); 1317 } 1318 DBF_EVENT("use_cq:%d", use_cq); 1319 } 1320 1321 /** 1322 * qdio_establish - establish queues on a qdio subchannel 1323 * @init_data: initialization data 1324 */ 1325 int qdio_establish(struct qdio_initialize *init_data) 1326 { 1327 struct ccw_device *cdev = init_data->cdev; 1328 struct subchannel_id schid; 1329 struct qdio_irq *irq_ptr; 1330 int rc; 1331 1332 ccw_device_get_schid(cdev, &schid); 1333 DBF_EVENT("qestablish:%4x", schid.sch_no); 1334 1335 irq_ptr = cdev->private->qdio_data; 1336 if (!irq_ptr) 1337 return -ENODEV; 1338 1339 mutex_lock(&irq_ptr->setup_mutex); 1340 qdio_setup_irq(init_data); 1341 1342 rc = qdio_establish_thinint(irq_ptr); 1343 if (rc) { 1344 mutex_unlock(&irq_ptr->setup_mutex); 1345 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); 1346 return rc; 1347 } 1348 1349 /* establish q */ 1350 irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd; 1351 irq_ptr->ccw.flags = CCW_FLAG_SLI; 1352 irq_ptr->ccw.count = irq_ptr->equeue.count; 1353 irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr); 1354 1355 spin_lock_irq(get_ccwdev_lock(cdev)); 1356 ccw_device_set_options_mask(cdev, 0); 1357 1358 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0); 1359 spin_unlock_irq(get_ccwdev_lock(cdev)); 1360 if (rc) { 1361 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no); 1362 DBF_ERROR("rc:%4x", rc); 1363 mutex_unlock(&irq_ptr->setup_mutex); 1364 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); 1365 return rc; 1366 } 1367 1368 wait_event_interruptible_timeout(cdev->private->wait_q, 1369 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED || 1370 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ); 1371 1372 if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) { 1373 mutex_unlock(&irq_ptr->setup_mutex); 1374 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); 1375 return -EIO; 1376 } 1377 1378 qdio_setup_ssqd_info(irq_ptr); 1379 1380 qdio_detect_hsicq(irq_ptr); 1381 1382 /* qebsm is now setup if available, initialize buffer states */ 1383 qdio_init_buf_states(irq_ptr); 1384 1385 mutex_unlock(&irq_ptr->setup_mutex); 1386 qdio_print_subchannel_info(irq_ptr, cdev); 1387 qdio_setup_debug_entries(irq_ptr, cdev); 1388 return 0; 1389 } 1390 EXPORT_SYMBOL_GPL(qdio_establish); 1391 1392 /** 1393 * qdio_activate - activate queues on a qdio subchannel 1394 * @cdev: associated cdev 1395 */ 1396 int qdio_activate(struct ccw_device *cdev) 1397 { 1398 struct subchannel_id schid; 1399 struct qdio_irq *irq_ptr; 1400 int rc; 1401 1402 ccw_device_get_schid(cdev, &schid); 1403 DBF_EVENT("qactivate:%4x", schid.sch_no); 1404 1405 irq_ptr = cdev->private->qdio_data; 1406 if (!irq_ptr) 1407 return -ENODEV; 1408 1409 mutex_lock(&irq_ptr->setup_mutex); 1410 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { 1411 rc = -EBUSY; 1412 goto out; 1413 } 1414 1415 irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd; 1416 irq_ptr->ccw.flags = CCW_FLAG_SLI; 1417 irq_ptr->ccw.count = irq_ptr->aqueue.count; 1418 irq_ptr->ccw.cda = 0; 1419 1420 spin_lock_irq(get_ccwdev_lock(cdev)); 1421 ccw_device_set_options(cdev, CCWDEV_REPORT_ALL); 1422 1423 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE, 1424 0, DOIO_DENY_PREFETCH); 1425 spin_unlock_irq(get_ccwdev_lock(cdev)); 1426 if (rc) { 1427 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no); 1428 DBF_ERROR("rc:%4x", rc); 1429 goto out; 1430 } 1431 1432 if (is_thinint_irq(irq_ptr)) 1433 tiqdio_add_input_queues(irq_ptr); 1434 1435 /* wait for subchannel to become active */ 1436 msleep(5); 1437 1438 switch (irq_ptr->state) { 1439 case QDIO_IRQ_STATE_STOPPED: 1440 case QDIO_IRQ_STATE_ERR: 1441 rc = -EIO; 1442 break; 1443 default: 1444 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE); 1445 rc = 0; 1446 } 1447 out: 1448 mutex_unlock(&irq_ptr->setup_mutex); 1449 return rc; 1450 } 1451 EXPORT_SYMBOL_GPL(qdio_activate); 1452 1453 static inline int buf_in_between(int bufnr, int start, int count) 1454 { 1455 int end = add_buf(start, count); 1456 1457 if (end > start) { 1458 if (bufnr >= start && bufnr < end) 1459 return 1; 1460 else 1461 return 0; 1462 } 1463 1464 /* wrap-around case */ 1465 if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) || 1466 (bufnr < end)) 1467 return 1; 1468 else 1469 return 0; 1470 } 1471 1472 /** 1473 * handle_inbound - reset processed input buffers 1474 * @q: queue containing the buffers 1475 * @callflags: flags 1476 * @bufnr: first buffer to process 1477 * @count: how many buffers are emptied 1478 */ 1479 static int handle_inbound(struct qdio_q *q, unsigned int callflags, 1480 int bufnr, int count) 1481 { 1482 int diff; 1483 1484 qperf_inc(q, inbound_call); 1485 1486 if (!q->u.in.polling) 1487 goto set; 1488 1489 /* protect against stop polling setting an ACK for an emptied slsb */ 1490 if (count == QDIO_MAX_BUFFERS_PER_Q) { 1491 /* overwriting everything, just delete polling status */ 1492 q->u.in.polling = 0; 1493 q->u.in.ack_count = 0; 1494 goto set; 1495 } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) { 1496 if (is_qebsm(q)) { 1497 /* partial overwrite, just update ack_start */ 1498 diff = add_buf(bufnr, count); 1499 diff = sub_buf(diff, q->u.in.ack_start); 1500 q->u.in.ack_count -= diff; 1501 if (q->u.in.ack_count <= 0) { 1502 q->u.in.polling = 0; 1503 q->u.in.ack_count = 0; 1504 goto set; 1505 } 1506 q->u.in.ack_start = add_buf(q->u.in.ack_start, diff); 1507 } 1508 else 1509 /* the only ACK will be deleted, so stop polling */ 1510 q->u.in.polling = 0; 1511 } 1512 1513 set: 1514 count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count); 1515 atomic_add(count, &q->nr_buf_used); 1516 1517 if (need_siga_in(q)) 1518 return qdio_siga_input(q); 1519 1520 return 0; 1521 } 1522 1523 /** 1524 * handle_outbound - process filled outbound buffers 1525 * @q: queue containing the buffers 1526 * @callflags: flags 1527 * @bufnr: first buffer to process 1528 * @count: how many buffers are filled 1529 */ 1530 static int handle_outbound(struct qdio_q *q, unsigned int callflags, 1531 int bufnr, int count) 1532 { 1533 unsigned char state = 0; 1534 int used, rc = 0; 1535 1536 qperf_inc(q, outbound_call); 1537 1538 count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count); 1539 used = atomic_add_return(count, &q->nr_buf_used); 1540 1541 if (used == QDIO_MAX_BUFFERS_PER_Q) 1542 qperf_inc(q, outbound_queue_full); 1543 1544 if (callflags & QDIO_FLAG_PCI_OUT) { 1545 q->u.out.pci_out_enabled = 1; 1546 qperf_inc(q, pci_request_int); 1547 } else 1548 q->u.out.pci_out_enabled = 0; 1549 1550 if (queue_type(q) == QDIO_IQDIO_QFMT) { 1551 unsigned long phys_aob = 0; 1552 1553 /* One SIGA-W per buffer required for unicast HSI */ 1554 WARN_ON_ONCE(count > 1 && !multicast_outbound(q)); 1555 1556 phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr); 1557 1558 rc = qdio_kick_outbound_q(q, phys_aob); 1559 } else if (need_siga_sync(q)) { 1560 rc = qdio_siga_sync_q(q); 1561 } else { 1562 /* try to fast requeue buffers */ 1563 get_buf_state(q, prev_buf(bufnr), &state, 0); 1564 if (state != SLSB_CU_OUTPUT_PRIMED) 1565 rc = qdio_kick_outbound_q(q, 0); 1566 else 1567 qperf_inc(q, fast_requeue); 1568 } 1569 1570 /* in case of SIGA errors we must process the error immediately */ 1571 if (used >= q->u.out.scan_threshold || rc) 1572 qdio_tasklet_schedule(q); 1573 else 1574 /* free the SBALs in case of no further traffic */ 1575 if (!timer_pending(&q->u.out.timer) && 1576 likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) 1577 mod_timer(&q->u.out.timer, jiffies + HZ); 1578 return rc; 1579 } 1580 1581 /** 1582 * do_QDIO - process input or output buffers 1583 * @cdev: associated ccw_device for the qdio subchannel 1584 * @callflags: input or output and special flags from the program 1585 * @q_nr: queue number 1586 * @bufnr: buffer number 1587 * @count: how many buffers to process 1588 */ 1589 int do_QDIO(struct ccw_device *cdev, unsigned int callflags, 1590 int q_nr, unsigned int bufnr, unsigned int count) 1591 { 1592 struct qdio_irq *irq_ptr; 1593 1594 if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q) 1595 return -EINVAL; 1596 1597 irq_ptr = cdev->private->qdio_data; 1598 if (!irq_ptr) 1599 return -ENODEV; 1600 1601 DBF_DEV_EVENT(DBF_INFO, irq_ptr, 1602 "do%02x b:%02x c:%02x", callflags, bufnr, count); 1603 1604 if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE) 1605 return -EIO; 1606 if (!count) 1607 return 0; 1608 if (callflags & QDIO_FLAG_SYNC_INPUT) 1609 return handle_inbound(irq_ptr->input_qs[q_nr], 1610 callflags, bufnr, count); 1611 else if (callflags & QDIO_FLAG_SYNC_OUTPUT) 1612 return handle_outbound(irq_ptr->output_qs[q_nr], 1613 callflags, bufnr, count); 1614 return -EINVAL; 1615 } 1616 EXPORT_SYMBOL_GPL(do_QDIO); 1617 1618 /** 1619 * qdio_start_irq - process input buffers 1620 * @cdev: associated ccw_device for the qdio subchannel 1621 * @nr: input queue number 1622 * 1623 * Return codes 1624 * 0 - success 1625 * 1 - irqs not started since new data is available 1626 */ 1627 int qdio_start_irq(struct ccw_device *cdev, int nr) 1628 { 1629 struct qdio_q *q; 1630 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1631 1632 if (!irq_ptr) 1633 return -ENODEV; 1634 q = irq_ptr->input_qs[nr]; 1635 1636 clear_nonshared_ind(irq_ptr); 1637 qdio_stop_polling(q); 1638 clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state); 1639 1640 /* 1641 * We need to check again to not lose initiative after 1642 * resetting the ACK state. 1643 */ 1644 if (test_nonshared_ind(irq_ptr)) 1645 goto rescan; 1646 if (!qdio_inbound_q_done(q, q->first_to_check)) 1647 goto rescan; 1648 return 0; 1649 1650 rescan: 1651 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, 1652 &q->u.in.queue_irq_state)) 1653 return 0; 1654 else 1655 return 1; 1656 1657 } 1658 EXPORT_SYMBOL(qdio_start_irq); 1659 1660 /** 1661 * qdio_get_next_buffers - process input buffers 1662 * @cdev: associated ccw_device for the qdio subchannel 1663 * @nr: input queue number 1664 * @bufnr: first filled buffer number 1665 * @error: buffers are in error state 1666 * 1667 * Return codes 1668 * < 0 - error 1669 * = 0 - no new buffers found 1670 * > 0 - number of processed buffers 1671 */ 1672 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr, 1673 int *error) 1674 { 1675 struct qdio_q *q; 1676 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1677 unsigned int start; 1678 int count; 1679 1680 if (!irq_ptr) 1681 return -ENODEV; 1682 q = irq_ptr->input_qs[nr]; 1683 start = q->first_to_check; 1684 1685 /* 1686 * Cannot rely on automatic sync after interrupt since queues may 1687 * also be examined without interrupt. 1688 */ 1689 if (need_siga_sync(q)) 1690 qdio_sync_queues(q); 1691 1692 qdio_check_outbound_pci_queues(irq_ptr); 1693 1694 count = qdio_inbound_q_moved(q, start); 1695 if (count == 0) 1696 return 0; 1697 1698 start = add_buf(start, count); 1699 q->first_to_check = start; 1700 1701 /* Note: upper-layer MUST stop processing immediately here ... */ 1702 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) 1703 return -EIO; 1704 1705 *bufnr = q->first_to_kick; 1706 *error = q->qdio_error; 1707 1708 /* for the next time */ 1709 q->first_to_kick = add_buf(q->first_to_kick, count); 1710 q->qdio_error = 0; 1711 1712 return count; 1713 } 1714 EXPORT_SYMBOL(qdio_get_next_buffers); 1715 1716 /** 1717 * qdio_stop_irq - disable interrupt processing for the device 1718 * @cdev: associated ccw_device for the qdio subchannel 1719 * @nr: input queue number 1720 * 1721 * Return codes 1722 * 0 - interrupts were already disabled 1723 * 1 - interrupts successfully disabled 1724 */ 1725 int qdio_stop_irq(struct ccw_device *cdev, int nr) 1726 { 1727 struct qdio_q *q; 1728 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1729 1730 if (!irq_ptr) 1731 return -ENODEV; 1732 q = irq_ptr->input_qs[nr]; 1733 1734 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, 1735 &q->u.in.queue_irq_state)) 1736 return 0; 1737 else 1738 return 1; 1739 } 1740 EXPORT_SYMBOL(qdio_stop_irq); 1741 1742 /** 1743 * qdio_pnso_brinfo() - perform network subchannel op #0 - bridge info. 1744 * @schid: Subchannel ID. 1745 * @cnc: Boolean Change-Notification Control 1746 * @response: Response code will be stored at this address 1747 * @cb: Callback function will be executed for each element 1748 * of the address list 1749 * @priv: Pointer to pass to the callback function. 1750 * 1751 * Performs "Store-network-bridging-information list" operation and calls 1752 * the callback function for every entry in the list. If "change- 1753 * notification-control" is set, further changes in the address list 1754 * will be reported via the IPA command. 1755 */ 1756 int qdio_pnso_brinfo(struct subchannel_id schid, 1757 int cnc, u16 *response, 1758 void (*cb)(void *priv, enum qdio_brinfo_entry_type type, 1759 void *entry), 1760 void *priv) 1761 { 1762 struct chsc_pnso_area *rr; 1763 int rc; 1764 u32 prev_instance = 0; 1765 int isfirstblock = 1; 1766 int i, size, elems; 1767 1768 rr = (struct chsc_pnso_area *)get_zeroed_page(GFP_KERNEL); 1769 if (rr == NULL) 1770 return -ENOMEM; 1771 do { 1772 /* on the first iteration, naihdr.resume_token will be zero */ 1773 rc = chsc_pnso_brinfo(schid, rr, rr->naihdr.resume_token, cnc); 1774 if (rc != 0 && rc != -EBUSY) 1775 goto out; 1776 if (rr->response.code != 1) { 1777 rc = -EIO; 1778 continue; 1779 } else 1780 rc = 0; 1781 1782 if (cb == NULL) 1783 continue; 1784 1785 size = rr->naihdr.naids; 1786 elems = (rr->response.length - 1787 sizeof(struct chsc_header) - 1788 sizeof(struct chsc_brinfo_naihdr)) / 1789 size; 1790 1791 if (!isfirstblock && (rr->naihdr.instance != prev_instance)) { 1792 /* Inform the caller that they need to scrap */ 1793 /* the data that was already reported via cb */ 1794 rc = -EAGAIN; 1795 break; 1796 } 1797 isfirstblock = 0; 1798 prev_instance = rr->naihdr.instance; 1799 for (i = 0; i < elems; i++) 1800 switch (size) { 1801 case sizeof(struct qdio_brinfo_entry_l3_ipv6): 1802 (*cb)(priv, l3_ipv6_addr, 1803 &rr->entries.l3_ipv6[i]); 1804 break; 1805 case sizeof(struct qdio_brinfo_entry_l3_ipv4): 1806 (*cb)(priv, l3_ipv4_addr, 1807 &rr->entries.l3_ipv4[i]); 1808 break; 1809 case sizeof(struct qdio_brinfo_entry_l2): 1810 (*cb)(priv, l2_addr_lnid, 1811 &rr->entries.l2[i]); 1812 break; 1813 default: 1814 WARN_ON_ONCE(1); 1815 rc = -EIO; 1816 goto out; 1817 } 1818 } while (rr->response.code == 0x0107 || /* channel busy */ 1819 (rr->response.code == 1 && /* list stored */ 1820 /* resume token is non-zero => list incomplete */ 1821 (rr->naihdr.resume_token.t1 || rr->naihdr.resume_token.t2))); 1822 (*response) = rr->response.code; 1823 1824 out: 1825 free_page((unsigned long)rr); 1826 return rc; 1827 } 1828 EXPORT_SYMBOL_GPL(qdio_pnso_brinfo); 1829 1830 static int __init init_QDIO(void) 1831 { 1832 int rc; 1833 1834 rc = qdio_debug_init(); 1835 if (rc) 1836 return rc; 1837 rc = qdio_setup_init(); 1838 if (rc) 1839 goto out_debug; 1840 rc = tiqdio_allocate_memory(); 1841 if (rc) 1842 goto out_cache; 1843 rc = tiqdio_register_thinints(); 1844 if (rc) 1845 goto out_ti; 1846 return 0; 1847 1848 out_ti: 1849 tiqdio_free_memory(); 1850 out_cache: 1851 qdio_setup_exit(); 1852 out_debug: 1853 qdio_debug_exit(); 1854 return rc; 1855 } 1856 1857 static void __exit exit_QDIO(void) 1858 { 1859 tiqdio_unregister_thinints(); 1860 tiqdio_free_memory(); 1861 qdio_setup_exit(); 1862 qdio_debug_exit(); 1863 } 1864 1865 module_init(init_QDIO); 1866 module_exit(exit_QDIO); 1867