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