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