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_INFO, 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 count, 314 unsigned int *busy_bit, 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; 320 321 if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) { 322 if (count > 1) 323 fc = QDIO_SIGA_WRITEM; 324 else if (aob) 325 fc = QDIO_SIGA_WRITEQ; 326 } 327 328 if (is_qebsm(q)) { 329 schid = q->irq_ptr->sch_token; 330 fc |= QDIO_SIGA_QEBSM_FLAG; 331 } 332 again: 333 cc = do_siga_output(schid, q->mask, busy_bit, fc, aob); 334 335 /* hipersocket busy condition */ 336 if (unlikely(*busy_bit)) { 337 retries++; 338 339 if (!start_time) { 340 start_time = get_tod_clock_fast(); 341 goto again; 342 } 343 if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE) 344 goto again; 345 } 346 if (retries) { 347 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, 348 "%4x cc2 BB1:%1d", SCH_NO(q), q->nr); 349 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries); 350 } 351 return cc; 352 } 353 354 static inline int qdio_siga_input(struct qdio_q *q) 355 { 356 unsigned long schid = *((u32 *) &q->irq_ptr->schid); 357 unsigned int fc = QDIO_SIGA_READ; 358 int cc; 359 360 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr); 361 qperf_inc(q, siga_read); 362 363 if (is_qebsm(q)) { 364 schid = q->irq_ptr->sch_token; 365 fc |= QDIO_SIGA_QEBSM_FLAG; 366 } 367 368 cc = do_siga_input(schid, q->mask, fc); 369 if (unlikely(cc)) 370 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc); 371 return (cc) ? -EIO : 0; 372 } 373 374 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0) 375 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U) 376 377 static inline void qdio_sync_queues(struct qdio_q *q) 378 { 379 /* PCI capable outbound queues will also be scanned so sync them too */ 380 if (pci_out_supported(q->irq_ptr)) 381 qdio_siga_sync_all(q); 382 else 383 qdio_siga_sync_q(q); 384 } 385 386 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr, 387 unsigned char *state) 388 { 389 if (need_siga_sync(q)) 390 qdio_siga_sync_q(q); 391 return get_buf_state(q, bufnr, state, 0); 392 } 393 394 static inline void qdio_stop_polling(struct qdio_q *q) 395 { 396 if (!q->u.in.polling) 397 return; 398 399 q->u.in.polling = 0; 400 qperf_inc(q, stop_polling); 401 402 /* show the card that we are not polling anymore */ 403 if (is_qebsm(q)) { 404 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, 405 q->u.in.ack_count); 406 q->u.in.ack_count = 0; 407 } else 408 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); 409 } 410 411 static inline void account_sbals(struct qdio_q *q, unsigned int count) 412 { 413 int pos; 414 415 q->q_stats.nr_sbal_total += count; 416 if (count == QDIO_MAX_BUFFERS_MASK) { 417 q->q_stats.nr_sbals[7]++; 418 return; 419 } 420 pos = ilog2(count); 421 q->q_stats.nr_sbals[pos]++; 422 } 423 424 static void process_buffer_error(struct qdio_q *q, unsigned int start, 425 int count) 426 { 427 q->qdio_error = QDIO_ERROR_SLSB_STATE; 428 429 /* special handling for no target buffer empty */ 430 if (queue_type(q) == QDIO_IQDIO_QFMT && !q->is_input_q && 431 q->sbal[start]->element[15].sflags == 0x10) { 432 qperf_inc(q, target_full); 433 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", start); 434 return; 435 } 436 437 DBF_ERROR("%4x BUF ERROR", SCH_NO(q)); 438 DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr); 439 DBF_ERROR("FTC:%3d C:%3d", start, count); 440 DBF_ERROR("F14:%2x F15:%2x", 441 q->sbal[start]->element[14].sflags, 442 q->sbal[start]->element[15].sflags); 443 } 444 445 static inline void inbound_primed(struct qdio_q *q, unsigned int start, 446 int count) 447 { 448 int new; 449 450 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr, count); 451 452 /* for QEBSM the ACK was already set by EQBS */ 453 if (is_qebsm(q)) { 454 if (!q->u.in.polling) { 455 q->u.in.polling = 1; 456 q->u.in.ack_count = count; 457 q->u.in.ack_start = start; 458 return; 459 } 460 461 /* delete the previous ACK's */ 462 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, 463 q->u.in.ack_count); 464 q->u.in.ack_count = count; 465 q->u.in.ack_start = start; 466 return; 467 } 468 469 /* 470 * ACK the newest buffer. The ACK will be removed in qdio_stop_polling 471 * or by the next inbound run. 472 */ 473 new = add_buf(start, count - 1); 474 if (q->u.in.polling) { 475 /* reset the previous ACK but first set the new one */ 476 set_buf_state(q, new, SLSB_P_INPUT_ACK); 477 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); 478 } else { 479 q->u.in.polling = 1; 480 set_buf_state(q, new, SLSB_P_INPUT_ACK); 481 } 482 483 q->u.in.ack_start = new; 484 count--; 485 if (!count) 486 return; 487 /* need to change ALL buffers to get more interrupts */ 488 set_buf_states(q, start, SLSB_P_INPUT_NOT_INIT, count); 489 } 490 491 static int get_inbound_buffer_frontier(struct qdio_q *q, unsigned int start) 492 { 493 unsigned char state = 0; 494 int count; 495 496 q->timestamp = get_tod_clock_fast(); 497 498 /* 499 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved 500 * would return 0. 501 */ 502 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); 503 if (!count) 504 return 0; 505 506 /* 507 * No siga sync here, as a PCI or we after a thin interrupt 508 * already sync'ed the queues. 509 */ 510 count = get_buf_states(q, start, &state, count, 1, 0); 511 if (!count) 512 return 0; 513 514 switch (state) { 515 case SLSB_P_INPUT_PRIMED: 516 inbound_primed(q, start, count); 517 if (atomic_sub_return(count, &q->nr_buf_used) == 0) 518 qperf_inc(q, inbound_queue_full); 519 if (q->irq_ptr->perf_stat_enabled) 520 account_sbals(q, count); 521 return count; 522 case SLSB_P_INPUT_ERROR: 523 process_buffer_error(q, start, count); 524 /* 525 * Interrupts may be avoided as long as the error is present 526 * so change the buffer state immediately to avoid starvation. 527 */ 528 set_buf_states(q, start, SLSB_P_INPUT_NOT_INIT, count); 529 if (atomic_sub_return(count, &q->nr_buf_used) == 0) 530 qperf_inc(q, inbound_queue_full); 531 if (q->irq_ptr->perf_stat_enabled) 532 account_sbals_error(q, count); 533 return count; 534 case SLSB_CU_INPUT_EMPTY: 535 case SLSB_P_INPUT_NOT_INIT: 536 case SLSB_P_INPUT_ACK: 537 if (q->irq_ptr->perf_stat_enabled) 538 q->q_stats.nr_sbal_nop++; 539 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x", 540 q->nr, start); 541 return 0; 542 default: 543 WARN_ON_ONCE(1); 544 return 0; 545 } 546 } 547 548 static int qdio_inbound_q_moved(struct qdio_q *q, unsigned int start) 549 { 550 int count; 551 552 count = get_inbound_buffer_frontier(q, start); 553 554 if (count && !is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR) 555 q->u.in.timestamp = get_tod_clock(); 556 557 return count; 558 } 559 560 static inline int qdio_inbound_q_done(struct qdio_q *q, unsigned int start) 561 { 562 unsigned char state = 0; 563 564 if (!atomic_read(&q->nr_buf_used)) 565 return 1; 566 567 if (need_siga_sync(q)) 568 qdio_siga_sync_q(q); 569 get_buf_state(q, start, &state, 0); 570 571 if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR) 572 /* more work coming */ 573 return 0; 574 575 if (is_thinint_irq(q->irq_ptr)) 576 return 1; 577 578 /* don't poll under z/VM */ 579 if (MACHINE_IS_VM) 580 return 1; 581 582 /* 583 * At this point we know, that inbound first_to_check 584 * has (probably) not moved (see qdio_inbound_processing). 585 */ 586 if (get_tod_clock_fast() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) { 587 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x", start); 588 return 1; 589 } else 590 return 0; 591 } 592 593 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count) 594 { 595 unsigned char state = 0; 596 int j, b = start; 597 598 for (j = 0; j < count; ++j) { 599 get_buf_state(q, b, &state, 0); 600 if (state == SLSB_P_OUTPUT_PENDING) { 601 struct qaob *aob = q->u.out.aobs[b]; 602 if (aob == NULL) 603 continue; 604 605 q->u.out.sbal_state[b].flags |= 606 QDIO_OUTBUF_STATE_FLAG_PENDING; 607 q->u.out.aobs[b] = NULL; 608 } 609 b = next_buf(b); 610 } 611 } 612 613 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q, 614 int bufnr) 615 { 616 unsigned long phys_aob = 0; 617 618 if (!q->aobs[bufnr]) { 619 struct qaob *aob = qdio_allocate_aob(); 620 q->aobs[bufnr] = aob; 621 } 622 if (q->aobs[bufnr]) { 623 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user; 624 phys_aob = virt_to_phys(q->aobs[bufnr]); 625 WARN_ON_ONCE(phys_aob & 0xFF); 626 } 627 628 q->sbal_state[bufnr].flags = 0; 629 return phys_aob; 630 } 631 632 static void qdio_kick_handler(struct qdio_q *q, unsigned int count) 633 { 634 int start = q->first_to_kick; 635 636 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) 637 return; 638 639 if (q->is_input_q) { 640 qperf_inc(q, inbound_handler); 641 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count); 642 } else { 643 qperf_inc(q, outbound_handler); 644 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x", 645 start, count); 646 } 647 648 q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count, 649 q->irq_ptr->int_parm); 650 651 /* for the next time */ 652 q->first_to_kick = add_buf(start, count); 653 q->qdio_error = 0; 654 } 655 656 static inline int qdio_tasklet_schedule(struct qdio_q *q) 657 { 658 if (likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) { 659 tasklet_schedule(&q->tasklet); 660 return 0; 661 } 662 return -EPERM; 663 } 664 665 static void __qdio_inbound_processing(struct qdio_q *q) 666 { 667 unsigned int start = q->first_to_check; 668 int count; 669 670 qperf_inc(q, tasklet_inbound); 671 672 count = qdio_inbound_q_moved(q, start); 673 if (count == 0) 674 return; 675 676 start = add_buf(start, count); 677 q->first_to_check = start; 678 qdio_kick_handler(q, count); 679 680 if (!qdio_inbound_q_done(q, start)) { 681 /* means poll time is not yet over */ 682 qperf_inc(q, tasklet_inbound_resched); 683 if (!qdio_tasklet_schedule(q)) 684 return; 685 } 686 687 qdio_stop_polling(q); 688 /* 689 * We need to check again to not lose initiative after 690 * resetting the ACK state. 691 */ 692 if (!qdio_inbound_q_done(q, start)) { 693 qperf_inc(q, tasklet_inbound_resched2); 694 qdio_tasklet_schedule(q); 695 } 696 } 697 698 void qdio_inbound_processing(unsigned long data) 699 { 700 struct qdio_q *q = (struct qdio_q *)data; 701 __qdio_inbound_processing(q); 702 } 703 704 static int get_outbound_buffer_frontier(struct qdio_q *q, unsigned int start) 705 { 706 unsigned char state = 0; 707 int count; 708 709 q->timestamp = get_tod_clock_fast(); 710 711 if (need_siga_sync(q)) 712 if (((queue_type(q) != QDIO_IQDIO_QFMT) && 713 !pci_out_supported(q->irq_ptr)) || 714 (queue_type(q) == QDIO_IQDIO_QFMT && 715 multicast_outbound(q))) 716 qdio_siga_sync_q(q); 717 718 count = atomic_read(&q->nr_buf_used); 719 if (!count) 720 return 0; 721 722 count = get_buf_states(q, start, &state, count, 0, q->u.out.use_cq); 723 if (!count) 724 return 0; 725 726 switch (state) { 727 case SLSB_P_OUTPUT_EMPTY: 728 case SLSB_P_OUTPUT_PENDING: 729 /* the adapter got it */ 730 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, 731 "out empty:%1d %02x", q->nr, count); 732 733 atomic_sub(count, &q->nr_buf_used); 734 if (q->irq_ptr->perf_stat_enabled) 735 account_sbals(q, count); 736 return count; 737 case SLSB_P_OUTPUT_ERROR: 738 process_buffer_error(q, start, count); 739 atomic_sub(count, &q->nr_buf_used); 740 if (q->irq_ptr->perf_stat_enabled) 741 account_sbals_error(q, count); 742 return count; 743 case SLSB_CU_OUTPUT_PRIMED: 744 /* the adapter has not fetched the output yet */ 745 if (q->irq_ptr->perf_stat_enabled) 746 q->q_stats.nr_sbal_nop++; 747 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", 748 q->nr); 749 return 0; 750 case SLSB_P_OUTPUT_NOT_INIT: 751 case SLSB_P_OUTPUT_HALTED: 752 return 0; 753 default: 754 WARN_ON_ONCE(1); 755 return 0; 756 } 757 } 758 759 /* all buffers processed? */ 760 static inline int qdio_outbound_q_done(struct qdio_q *q) 761 { 762 return atomic_read(&q->nr_buf_used) == 0; 763 } 764 765 static inline int qdio_outbound_q_moved(struct qdio_q *q, unsigned int start) 766 { 767 int count; 768 769 count = get_outbound_buffer_frontier(q, start); 770 771 if (count) { 772 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr); 773 if (q->u.out.use_cq) 774 qdio_handle_aobs(q, start, count); 775 } 776 777 return count; 778 } 779 780 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned int count, 781 unsigned long aob) 782 { 783 int retries = 0, cc; 784 unsigned int busy_bit; 785 786 if (!need_siga_out(q)) 787 return 0; 788 789 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr); 790 retry: 791 qperf_inc(q, siga_write); 792 793 cc = qdio_siga_output(q, count, &busy_bit, aob); 794 switch (cc) { 795 case 0: 796 break; 797 case 2: 798 if (busy_bit) { 799 while (++retries < QDIO_BUSY_BIT_RETRIES) { 800 mdelay(QDIO_BUSY_BIT_RETRY_DELAY); 801 goto retry; 802 } 803 DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr); 804 cc = -EBUSY; 805 } else { 806 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr); 807 cc = -ENOBUFS; 808 } 809 break; 810 case 1: 811 case 3: 812 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc); 813 cc = -EIO; 814 break; 815 } 816 if (retries) { 817 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr); 818 DBF_ERROR("count:%u", retries); 819 } 820 return cc; 821 } 822 823 static void __qdio_outbound_processing(struct qdio_q *q) 824 { 825 unsigned int start = q->first_to_check; 826 int count; 827 828 qperf_inc(q, tasklet_outbound); 829 WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0); 830 831 count = qdio_outbound_q_moved(q, start); 832 if (count) { 833 q->first_to_check = add_buf(start, count); 834 qdio_kick_handler(q, count); 835 } 836 837 if (queue_type(q) == QDIO_ZFCP_QFMT && !pci_out_supported(q->irq_ptr) && 838 !qdio_outbound_q_done(q)) 839 goto sched; 840 841 if (q->u.out.pci_out_enabled) 842 return; 843 844 /* 845 * Now we know that queue type is either qeth without pci enabled 846 * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY 847 * is noticed and outbound_handler is called after some time. 848 */ 849 if (qdio_outbound_q_done(q)) 850 del_timer_sync(&q->u.out.timer); 851 else 852 if (!timer_pending(&q->u.out.timer) && 853 likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) 854 mod_timer(&q->u.out.timer, jiffies + 10 * HZ); 855 return; 856 857 sched: 858 qdio_tasklet_schedule(q); 859 } 860 861 /* outbound tasklet */ 862 void qdio_outbound_processing(unsigned long data) 863 { 864 struct qdio_q *q = (struct qdio_q *)data; 865 __qdio_outbound_processing(q); 866 } 867 868 void qdio_outbound_timer(struct timer_list *t) 869 { 870 struct qdio_q *q = from_timer(q, t, u.out.timer); 871 872 qdio_tasklet_schedule(q); 873 } 874 875 static inline void qdio_check_outbound_pci_queues(struct qdio_irq *irq) 876 { 877 struct qdio_q *out; 878 int i; 879 880 if (!pci_out_supported(irq) || !irq->scan_threshold) 881 return; 882 883 for_each_output_queue(irq, out, i) 884 if (!qdio_outbound_q_done(out)) 885 qdio_tasklet_schedule(out); 886 } 887 888 static void __tiqdio_inbound_processing(struct qdio_q *q) 889 { 890 unsigned int start = q->first_to_check; 891 int count; 892 893 qperf_inc(q, tasklet_inbound); 894 if (need_siga_sync(q) && need_siga_sync_after_ai(q)) 895 qdio_sync_queues(q); 896 897 /* The interrupt could be caused by a PCI request: */ 898 qdio_check_outbound_pci_queues(q->irq_ptr); 899 900 count = qdio_inbound_q_moved(q, start); 901 if (count == 0) 902 return; 903 904 start = add_buf(start, count); 905 q->first_to_check = start; 906 qdio_kick_handler(q, count); 907 908 if (!qdio_inbound_q_done(q, start)) { 909 qperf_inc(q, tasklet_inbound_resched); 910 if (!qdio_tasklet_schedule(q)) 911 return; 912 } 913 914 qdio_stop_polling(q); 915 /* 916 * We need to check again to not lose initiative after 917 * resetting the ACK state. 918 */ 919 if (!qdio_inbound_q_done(q, start)) { 920 qperf_inc(q, tasklet_inbound_resched2); 921 qdio_tasklet_schedule(q); 922 } 923 } 924 925 void tiqdio_inbound_processing(unsigned long data) 926 { 927 struct qdio_q *q = (struct qdio_q *)data; 928 __tiqdio_inbound_processing(q); 929 } 930 931 static inline void qdio_set_state(struct qdio_irq *irq_ptr, 932 enum qdio_irq_states state) 933 { 934 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state); 935 936 irq_ptr->state = state; 937 mb(); 938 } 939 940 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb) 941 { 942 if (irb->esw.esw0.erw.cons) { 943 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no); 944 DBF_ERROR_HEX(irb, 64); 945 DBF_ERROR_HEX(irb->ecw, 64); 946 } 947 } 948 949 /* PCI interrupt handler */ 950 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr) 951 { 952 int i; 953 struct qdio_q *q; 954 955 if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) 956 return; 957 958 for_each_input_queue(irq_ptr, q, i) { 959 if (q->u.in.queue_start_poll) { 960 /* skip if polling is enabled or already in work */ 961 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, 962 &q->u.in.queue_irq_state)) { 963 QDIO_PERF_STAT_INC(irq_ptr, int_discarded); 964 continue; 965 } 966 q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr, 967 q->irq_ptr->int_parm); 968 } else { 969 tasklet_schedule(&q->tasklet); 970 } 971 } 972 973 if (!pci_out_supported(irq_ptr) || !irq_ptr->scan_threshold) 974 return; 975 976 for_each_output_queue(irq_ptr, q, i) { 977 if (qdio_outbound_q_done(q)) 978 continue; 979 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q)) 980 qdio_siga_sync_q(q); 981 qdio_tasklet_schedule(q); 982 } 983 } 984 985 static void qdio_handle_activate_check(struct ccw_device *cdev, 986 unsigned long intparm, int cstat, int dstat) 987 { 988 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 989 struct qdio_q *q; 990 int count; 991 992 DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no); 993 DBF_ERROR("intp :%lx", intparm); 994 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); 995 996 if (irq_ptr->nr_input_qs) { 997 q = irq_ptr->input_qs[0]; 998 } else if (irq_ptr->nr_output_qs) { 999 q = irq_ptr->output_qs[0]; 1000 } else { 1001 dump_stack(); 1002 goto no_handler; 1003 } 1004 1005 count = sub_buf(q->first_to_check, q->first_to_kick); 1006 q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE, 1007 q->nr, q->first_to_kick, count, irq_ptr->int_parm); 1008 no_handler: 1009 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); 1010 /* 1011 * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen. 1012 * Therefore we call the LGR detection function here. 1013 */ 1014 lgr_info_log(); 1015 } 1016 1017 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat, 1018 int dstat) 1019 { 1020 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1021 1022 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq"); 1023 1024 if (cstat) 1025 goto error; 1026 if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END)) 1027 goto error; 1028 if (!(dstat & DEV_STAT_DEV_END)) 1029 goto error; 1030 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED); 1031 return; 1032 1033 error: 1034 DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no); 1035 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); 1036 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); 1037 } 1038 1039 /* qdio interrupt handler */ 1040 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm, 1041 struct irb *irb) 1042 { 1043 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1044 struct subchannel_id schid; 1045 int cstat, dstat; 1046 1047 if (!intparm || !irq_ptr) { 1048 ccw_device_get_schid(cdev, &schid); 1049 DBF_ERROR("qint:%4x", schid.sch_no); 1050 return; 1051 } 1052 1053 if (irq_ptr->perf_stat_enabled) 1054 irq_ptr->perf_stat.qdio_int++; 1055 1056 if (IS_ERR(irb)) { 1057 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no); 1058 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); 1059 wake_up(&cdev->private->wait_q); 1060 return; 1061 } 1062 qdio_irq_check_sense(irq_ptr, irb); 1063 cstat = irb->scsw.cmd.cstat; 1064 dstat = irb->scsw.cmd.dstat; 1065 1066 switch (irq_ptr->state) { 1067 case QDIO_IRQ_STATE_INACTIVE: 1068 qdio_establish_handle_irq(cdev, cstat, dstat); 1069 break; 1070 case QDIO_IRQ_STATE_CLEANUP: 1071 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); 1072 break; 1073 case QDIO_IRQ_STATE_ESTABLISHED: 1074 case QDIO_IRQ_STATE_ACTIVE: 1075 if (cstat & SCHN_STAT_PCI) { 1076 qdio_int_handler_pci(irq_ptr); 1077 return; 1078 } 1079 if (cstat || dstat) 1080 qdio_handle_activate_check(cdev, intparm, cstat, 1081 dstat); 1082 break; 1083 case QDIO_IRQ_STATE_STOPPED: 1084 break; 1085 default: 1086 WARN_ON_ONCE(1); 1087 } 1088 wake_up(&cdev->private->wait_q); 1089 } 1090 1091 /** 1092 * qdio_get_ssqd_desc - get qdio subchannel description 1093 * @cdev: ccw device to get description for 1094 * @data: where to store the ssqd 1095 * 1096 * Returns 0 or an error code. The results of the chsc are stored in the 1097 * specified structure. 1098 */ 1099 int qdio_get_ssqd_desc(struct ccw_device *cdev, 1100 struct qdio_ssqd_desc *data) 1101 { 1102 struct subchannel_id schid; 1103 1104 if (!cdev || !cdev->private) 1105 return -EINVAL; 1106 1107 ccw_device_get_schid(cdev, &schid); 1108 DBF_EVENT("get ssqd:%4x", schid.sch_no); 1109 return qdio_setup_get_ssqd(NULL, &schid, data); 1110 } 1111 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc); 1112 1113 static void qdio_shutdown_queues(struct ccw_device *cdev) 1114 { 1115 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1116 struct qdio_q *q; 1117 int i; 1118 1119 for_each_input_queue(irq_ptr, q, i) 1120 tasklet_kill(&q->tasklet); 1121 1122 for_each_output_queue(irq_ptr, q, i) { 1123 del_timer_sync(&q->u.out.timer); 1124 tasklet_kill(&q->tasklet); 1125 } 1126 } 1127 1128 /** 1129 * qdio_shutdown - shut down a qdio subchannel 1130 * @cdev: associated ccw device 1131 * @how: use halt or clear to shutdown 1132 */ 1133 int qdio_shutdown(struct ccw_device *cdev, int how) 1134 { 1135 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1136 struct subchannel_id schid; 1137 int rc; 1138 1139 if (!irq_ptr) 1140 return -ENODEV; 1141 1142 WARN_ON_ONCE(irqs_disabled()); 1143 ccw_device_get_schid(cdev, &schid); 1144 DBF_EVENT("qshutdown:%4x", schid.sch_no); 1145 1146 mutex_lock(&irq_ptr->setup_mutex); 1147 /* 1148 * Subchannel was already shot down. We cannot prevent being called 1149 * twice since cio may trigger a shutdown asynchronously. 1150 */ 1151 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { 1152 mutex_unlock(&irq_ptr->setup_mutex); 1153 return 0; 1154 } 1155 1156 /* 1157 * Indicate that the device is going down. Scheduling the queue 1158 * tasklets is forbidden from here on. 1159 */ 1160 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); 1161 1162 tiqdio_remove_device(irq_ptr); 1163 qdio_shutdown_queues(cdev); 1164 qdio_shutdown_debug_entries(irq_ptr); 1165 1166 /* cleanup subchannel */ 1167 spin_lock_irq(get_ccwdev_lock(cdev)); 1168 1169 if (how & QDIO_FLAG_CLEANUP_USING_CLEAR) 1170 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP); 1171 else 1172 /* default behaviour is halt */ 1173 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP); 1174 if (rc) { 1175 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no); 1176 DBF_ERROR("rc:%4d", rc); 1177 goto no_cleanup; 1178 } 1179 1180 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP); 1181 spin_unlock_irq(get_ccwdev_lock(cdev)); 1182 wait_event_interruptible_timeout(cdev->private->wait_q, 1183 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE || 1184 irq_ptr->state == QDIO_IRQ_STATE_ERR, 1185 10 * HZ); 1186 spin_lock_irq(get_ccwdev_lock(cdev)); 1187 1188 no_cleanup: 1189 qdio_shutdown_thinint(irq_ptr); 1190 1191 /* restore interrupt handler */ 1192 if ((void *)cdev->handler == (void *)qdio_int_handler) { 1193 cdev->handler = irq_ptr->orig_handler; 1194 cdev->private->intparm = 0; 1195 } 1196 spin_unlock_irq(get_ccwdev_lock(cdev)); 1197 1198 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); 1199 mutex_unlock(&irq_ptr->setup_mutex); 1200 if (rc) 1201 return rc; 1202 return 0; 1203 } 1204 EXPORT_SYMBOL_GPL(qdio_shutdown); 1205 1206 /** 1207 * qdio_free - free data structures for a qdio subchannel 1208 * @cdev: associated ccw device 1209 */ 1210 int qdio_free(struct ccw_device *cdev) 1211 { 1212 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1213 struct subchannel_id schid; 1214 1215 if (!irq_ptr) 1216 return -ENODEV; 1217 1218 ccw_device_get_schid(cdev, &schid); 1219 DBF_EVENT("qfree:%4x", schid.sch_no); 1220 DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned"); 1221 mutex_lock(&irq_ptr->setup_mutex); 1222 1223 irq_ptr->debug_area = NULL; 1224 cdev->private->qdio_data = NULL; 1225 mutex_unlock(&irq_ptr->setup_mutex); 1226 1227 qdio_release_memory(irq_ptr); 1228 return 0; 1229 } 1230 EXPORT_SYMBOL_GPL(qdio_free); 1231 1232 /** 1233 * qdio_allocate - allocate qdio queues and associated data 1234 * @init_data: initialization data 1235 */ 1236 int qdio_allocate(struct qdio_initialize *init_data) 1237 { 1238 struct subchannel_id schid; 1239 struct qdio_irq *irq_ptr; 1240 1241 ccw_device_get_schid(init_data->cdev, &schid); 1242 DBF_EVENT("qallocate:%4x", schid.sch_no); 1243 1244 if ((init_data->no_input_qs && !init_data->input_handler) || 1245 (init_data->no_output_qs && !init_data->output_handler)) 1246 return -EINVAL; 1247 1248 if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) || 1249 (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)) 1250 return -EINVAL; 1251 1252 if ((!init_data->input_sbal_addr_array) || 1253 (!init_data->output_sbal_addr_array)) 1254 return -EINVAL; 1255 1256 /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */ 1257 irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 1258 if (!irq_ptr) 1259 goto out_err; 1260 1261 mutex_init(&irq_ptr->setup_mutex); 1262 if (qdio_allocate_dbf(init_data, irq_ptr)) 1263 goto out_rel; 1264 1265 /* 1266 * Allocate a page for the chsc calls in qdio_establish. 1267 * Must be pre-allocated since a zfcp recovery will call 1268 * qdio_establish. In case of low memory and swap on a zfcp disk 1269 * we may not be able to allocate memory otherwise. 1270 */ 1271 irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL); 1272 if (!irq_ptr->chsc_page) 1273 goto out_rel; 1274 1275 /* qdr is used in ccw1.cda which is u32 */ 1276 irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 1277 if (!irq_ptr->qdr) 1278 goto out_rel; 1279 1280 if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs, 1281 init_data->no_output_qs)) 1282 goto out_rel; 1283 1284 INIT_LIST_HEAD(&irq_ptr->entry); 1285 init_data->cdev->private->qdio_data = irq_ptr; 1286 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); 1287 return 0; 1288 out_rel: 1289 qdio_release_memory(irq_ptr); 1290 out_err: 1291 return -ENOMEM; 1292 } 1293 EXPORT_SYMBOL_GPL(qdio_allocate); 1294 1295 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr) 1296 { 1297 struct qdio_q *q = irq_ptr->input_qs[0]; 1298 int i, use_cq = 0; 1299 1300 if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT) 1301 use_cq = 1; 1302 1303 for_each_output_queue(irq_ptr, q, i) { 1304 if (use_cq) { 1305 if (multicast_outbound(q)) 1306 continue; 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_device(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 unsigned int bufnr, unsigned int count) 1528 { 1529 const unsigned int scan_threshold = q->irq_ptr->scan_threshold; 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 if (q->u.out.use_cq && count == 1) 1551 phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr); 1552 1553 rc = qdio_kick_outbound_q(q, count, phys_aob); 1554 } else if (need_siga_sync(q)) { 1555 rc = qdio_siga_sync_q(q); 1556 } else if (count < QDIO_MAX_BUFFERS_PER_Q && 1557 get_buf_state(q, prev_buf(bufnr), &state, 0) > 0 && 1558 state == SLSB_CU_OUTPUT_PRIMED) { 1559 /* The previous buffer is not processed yet, tack on. */ 1560 qperf_inc(q, fast_requeue); 1561 } else { 1562 rc = qdio_kick_outbound_q(q, count, 0); 1563 } 1564 1565 /* Let drivers implement their own completion scanning: */ 1566 if (!scan_threshold) 1567 return rc; 1568 1569 /* in case of SIGA errors we must process the error immediately */ 1570 if (used >= scan_threshold || rc) 1571 qdio_tasklet_schedule(q); 1572 else 1573 /* free the SBALs in case of no further traffic */ 1574 if (!timer_pending(&q->u.out.timer) && 1575 likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) 1576 mod_timer(&q->u.out.timer, jiffies + HZ); 1577 return rc; 1578 } 1579 1580 /** 1581 * do_QDIO - process input or output buffers 1582 * @cdev: associated ccw_device for the qdio subchannel 1583 * @callflags: input or output and special flags from the program 1584 * @q_nr: queue number 1585 * @bufnr: buffer number 1586 * @count: how many buffers to process 1587 */ 1588 int do_QDIO(struct ccw_device *cdev, unsigned int callflags, 1589 int q_nr, unsigned int bufnr, unsigned int count) 1590 { 1591 struct qdio_irq *irq_ptr; 1592 1593 if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q) 1594 return -EINVAL; 1595 1596 irq_ptr = cdev->private->qdio_data; 1597 if (!irq_ptr) 1598 return -ENODEV; 1599 1600 DBF_DEV_EVENT(DBF_INFO, irq_ptr, 1601 "do%02x b:%02x c:%02x", callflags, bufnr, count); 1602 1603 if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE) 1604 return -EIO; 1605 if (!count) 1606 return 0; 1607 if (callflags & QDIO_FLAG_SYNC_INPUT) 1608 return handle_inbound(irq_ptr->input_qs[q_nr], 1609 callflags, bufnr, count); 1610 else if (callflags & QDIO_FLAG_SYNC_OUTPUT) 1611 return handle_outbound(irq_ptr->output_qs[q_nr], 1612 callflags, bufnr, count); 1613 return -EINVAL; 1614 } 1615 EXPORT_SYMBOL_GPL(do_QDIO); 1616 1617 /** 1618 * qdio_start_irq - process input buffers 1619 * @cdev: associated ccw_device for the qdio subchannel 1620 * @nr: input queue number 1621 * 1622 * Return codes 1623 * 0 - success 1624 * 1 - irqs not started since new data is available 1625 */ 1626 int qdio_start_irq(struct ccw_device *cdev, int nr) 1627 { 1628 struct qdio_q *q; 1629 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1630 1631 if (!irq_ptr) 1632 return -ENODEV; 1633 q = irq_ptr->input_qs[nr]; 1634 1635 clear_nonshared_ind(irq_ptr); 1636 qdio_stop_polling(q); 1637 clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state); 1638 1639 /* 1640 * We need to check again to not lose initiative after 1641 * resetting the ACK state. 1642 */ 1643 if (test_nonshared_ind(irq_ptr)) 1644 goto rescan; 1645 if (!qdio_inbound_q_done(q, q->first_to_check)) 1646 goto rescan; 1647 return 0; 1648 1649 rescan: 1650 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, 1651 &q->u.in.queue_irq_state)) 1652 return 0; 1653 else 1654 return 1; 1655 1656 } 1657 EXPORT_SYMBOL(qdio_start_irq); 1658 1659 static int __qdio_inspect_queue(struct qdio_q *q, unsigned int *bufnr, 1660 unsigned int *error) 1661 { 1662 unsigned int start = q->first_to_check; 1663 int count; 1664 1665 count = q->is_input_q ? qdio_inbound_q_moved(q, start) : 1666 qdio_outbound_q_moved(q, start); 1667 if (count == 0) 1668 return 0; 1669 1670 *bufnr = start; 1671 *error = q->qdio_error; 1672 1673 /* for the next time */ 1674 q->first_to_check = add_buf(start, count); 1675 q->qdio_error = 0; 1676 1677 return count; 1678 } 1679 1680 int qdio_inspect_queue(struct ccw_device *cdev, unsigned int nr, bool is_input, 1681 unsigned int *bufnr, unsigned int *error) 1682 { 1683 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1684 struct qdio_q *q; 1685 1686 if (!irq_ptr) 1687 return -ENODEV; 1688 q = is_input ? irq_ptr->input_qs[nr] : irq_ptr->output_qs[nr]; 1689 1690 if (need_siga_sync(q)) 1691 qdio_siga_sync_q(q); 1692 1693 return __qdio_inspect_queue(q, bufnr, error); 1694 } 1695 EXPORT_SYMBOL_GPL(qdio_inspect_queue); 1696 1697 /** 1698 * qdio_get_next_buffers - process input buffers 1699 * @cdev: associated ccw_device for the qdio subchannel 1700 * @nr: input queue number 1701 * @bufnr: first filled buffer number 1702 * @error: buffers are in error state 1703 * 1704 * Return codes 1705 * < 0 - error 1706 * = 0 - no new buffers found 1707 * > 0 - number of processed buffers 1708 */ 1709 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr, 1710 int *error) 1711 { 1712 struct qdio_q *q; 1713 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1714 1715 if (!irq_ptr) 1716 return -ENODEV; 1717 q = irq_ptr->input_qs[nr]; 1718 1719 /* 1720 * Cannot rely on automatic sync after interrupt since queues may 1721 * also be examined without interrupt. 1722 */ 1723 if (need_siga_sync(q)) 1724 qdio_sync_queues(q); 1725 1726 qdio_check_outbound_pci_queues(irq_ptr); 1727 1728 /* Note: upper-layer MUST stop processing immediately here ... */ 1729 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) 1730 return -EIO; 1731 1732 return __qdio_inspect_queue(q, bufnr, error); 1733 } 1734 EXPORT_SYMBOL(qdio_get_next_buffers); 1735 1736 /** 1737 * qdio_stop_irq - disable interrupt processing for the device 1738 * @cdev: associated ccw_device for the qdio subchannel 1739 * @nr: input queue number 1740 * 1741 * Return codes 1742 * 0 - interrupts were already disabled 1743 * 1 - interrupts successfully disabled 1744 */ 1745 int qdio_stop_irq(struct ccw_device *cdev, int nr) 1746 { 1747 struct qdio_q *q; 1748 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1749 1750 if (!irq_ptr) 1751 return -ENODEV; 1752 q = irq_ptr->input_qs[nr]; 1753 1754 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, 1755 &q->u.in.queue_irq_state)) 1756 return 0; 1757 else 1758 return 1; 1759 } 1760 EXPORT_SYMBOL(qdio_stop_irq); 1761 1762 /** 1763 * qdio_pnso_brinfo() - perform network subchannel op #0 - bridge info. 1764 * @schid: Subchannel ID. 1765 * @cnc: Boolean Change-Notification Control 1766 * @response: Response code will be stored at this address 1767 * @cb: Callback function will be executed for each element 1768 * of the address list 1769 * @priv: Pointer to pass to the callback function. 1770 * 1771 * Performs "Store-network-bridging-information list" operation and calls 1772 * the callback function for every entry in the list. If "change- 1773 * notification-control" is set, further changes in the address list 1774 * will be reported via the IPA command. 1775 */ 1776 int qdio_pnso_brinfo(struct subchannel_id schid, 1777 int cnc, u16 *response, 1778 void (*cb)(void *priv, enum qdio_brinfo_entry_type type, 1779 void *entry), 1780 void *priv) 1781 { 1782 struct chsc_pnso_area *rr; 1783 int rc; 1784 u32 prev_instance = 0; 1785 int isfirstblock = 1; 1786 int i, size, elems; 1787 1788 rr = (struct chsc_pnso_area *)get_zeroed_page(GFP_KERNEL); 1789 if (rr == NULL) 1790 return -ENOMEM; 1791 do { 1792 /* on the first iteration, naihdr.resume_token will be zero */ 1793 rc = chsc_pnso_brinfo(schid, rr, rr->naihdr.resume_token, cnc); 1794 if (rc != 0 && rc != -EBUSY) 1795 goto out; 1796 if (rr->response.code != 1) { 1797 rc = -EIO; 1798 continue; 1799 } else 1800 rc = 0; 1801 1802 if (cb == NULL) 1803 continue; 1804 1805 size = rr->naihdr.naids; 1806 elems = (rr->response.length - 1807 sizeof(struct chsc_header) - 1808 sizeof(struct chsc_brinfo_naihdr)) / 1809 size; 1810 1811 if (!isfirstblock && (rr->naihdr.instance != prev_instance)) { 1812 /* Inform the caller that they need to scrap */ 1813 /* the data that was already reported via cb */ 1814 rc = -EAGAIN; 1815 break; 1816 } 1817 isfirstblock = 0; 1818 prev_instance = rr->naihdr.instance; 1819 for (i = 0; i < elems; i++) 1820 switch (size) { 1821 case sizeof(struct qdio_brinfo_entry_l3_ipv6): 1822 (*cb)(priv, l3_ipv6_addr, 1823 &rr->entries.l3_ipv6[i]); 1824 break; 1825 case sizeof(struct qdio_brinfo_entry_l3_ipv4): 1826 (*cb)(priv, l3_ipv4_addr, 1827 &rr->entries.l3_ipv4[i]); 1828 break; 1829 case sizeof(struct qdio_brinfo_entry_l2): 1830 (*cb)(priv, l2_addr_lnid, 1831 &rr->entries.l2[i]); 1832 break; 1833 default: 1834 WARN_ON_ONCE(1); 1835 rc = -EIO; 1836 goto out; 1837 } 1838 } while (rr->response.code == 0x0107 || /* channel busy */ 1839 (rr->response.code == 1 && /* list stored */ 1840 /* resume token is non-zero => list incomplete */ 1841 (rr->naihdr.resume_token.t1 || rr->naihdr.resume_token.t2))); 1842 (*response) = rr->response.code; 1843 1844 out: 1845 free_page((unsigned long)rr); 1846 return rc; 1847 } 1848 EXPORT_SYMBOL_GPL(qdio_pnso_brinfo); 1849 1850 static int __init init_QDIO(void) 1851 { 1852 int rc; 1853 1854 rc = qdio_debug_init(); 1855 if (rc) 1856 return rc; 1857 rc = qdio_setup_init(); 1858 if (rc) 1859 goto out_debug; 1860 rc = tiqdio_allocate_memory(); 1861 if (rc) 1862 goto out_cache; 1863 rc = tiqdio_register_thinints(); 1864 if (rc) 1865 goto out_ti; 1866 return 0; 1867 1868 out_ti: 1869 tiqdio_free_memory(); 1870 out_cache: 1871 qdio_setup_exit(); 1872 out_debug: 1873 qdio_debug_exit(); 1874 return rc; 1875 } 1876 1877 static void __exit exit_QDIO(void) 1878 { 1879 tiqdio_unregister_thinints(); 1880 tiqdio_free_memory(); 1881 qdio_setup_exit(); 1882 qdio_debug_exit(); 1883 } 1884 1885 module_init(init_QDIO); 1886 module_exit(exit_QDIO); 1887