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_check, 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_check, 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 /* Ensure that all preceding changes to the SBALs are visible: */ 258 mb(); 259 260 for (i = 0; i < count; i++) { 261 WRITE_ONCE(q->slsb.val[bufnr], state); 262 bufnr = next_buf(bufnr); 263 } 264 265 /* Make our SLSB changes visible: */ 266 mb(); 267 268 return count; 269 } 270 271 static inline int set_buf_state(struct qdio_q *q, int bufnr, 272 unsigned char state) 273 { 274 return set_buf_states(q, bufnr, state, 1); 275 } 276 277 /* set slsb states to initial state */ 278 static void qdio_init_buf_states(struct qdio_irq *irq_ptr) 279 { 280 struct qdio_q *q; 281 int i; 282 283 for_each_input_queue(irq_ptr, q, i) 284 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT, 285 QDIO_MAX_BUFFERS_PER_Q); 286 for_each_output_queue(irq_ptr, q, i) 287 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT, 288 QDIO_MAX_BUFFERS_PER_Q); 289 } 290 291 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output, 292 unsigned int input) 293 { 294 unsigned long schid = *((u32 *) &q->irq_ptr->schid); 295 unsigned int fc = QDIO_SIGA_SYNC; 296 int cc; 297 298 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr); 299 qperf_inc(q, siga_sync); 300 301 if (is_qebsm(q)) { 302 schid = q->irq_ptr->sch_token; 303 fc |= QDIO_SIGA_QEBSM_FLAG; 304 } 305 306 cc = do_siga_sync(schid, output, input, fc); 307 if (unlikely(cc)) 308 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc); 309 return (cc) ? -EIO : 0; 310 } 311 312 static inline int qdio_siga_sync_q(struct qdio_q *q) 313 { 314 if (q->is_input_q) 315 return qdio_siga_sync(q, 0, q->mask); 316 else 317 return qdio_siga_sync(q, q->mask, 0); 318 } 319 320 static int qdio_siga_output(struct qdio_q *q, unsigned int count, 321 unsigned int *busy_bit, unsigned long aob) 322 { 323 unsigned long schid = *((u32 *) &q->irq_ptr->schid); 324 unsigned int fc = QDIO_SIGA_WRITE; 325 u64 start_time = 0; 326 int retries = 0, cc; 327 328 if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) { 329 if (count > 1) 330 fc = QDIO_SIGA_WRITEM; 331 else if (aob) 332 fc = QDIO_SIGA_WRITEQ; 333 } 334 335 if (is_qebsm(q)) { 336 schid = q->irq_ptr->sch_token; 337 fc |= QDIO_SIGA_QEBSM_FLAG; 338 } 339 again: 340 cc = do_siga_output(schid, q->mask, busy_bit, fc, aob); 341 342 /* hipersocket busy condition */ 343 if (unlikely(*busy_bit)) { 344 retries++; 345 346 if (!start_time) { 347 start_time = get_tod_clock_fast(); 348 goto again; 349 } 350 if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE) 351 goto again; 352 } 353 if (retries) { 354 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, 355 "%4x cc2 BB1:%1d", SCH_NO(q), q->nr); 356 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries); 357 } 358 return cc; 359 } 360 361 static inline int qdio_siga_input(struct qdio_q *q) 362 { 363 unsigned long schid = *((u32 *) &q->irq_ptr->schid); 364 unsigned int fc = QDIO_SIGA_READ; 365 int cc; 366 367 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr); 368 qperf_inc(q, siga_read); 369 370 if (is_qebsm(q)) { 371 schid = q->irq_ptr->sch_token; 372 fc |= QDIO_SIGA_QEBSM_FLAG; 373 } 374 375 cc = do_siga_input(schid, q->mask, fc); 376 if (unlikely(cc)) 377 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc); 378 return (cc) ? -EIO : 0; 379 } 380 381 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0) 382 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U) 383 384 static inline void qdio_sync_queues(struct qdio_q *q) 385 { 386 /* PCI capable outbound queues will also be scanned so sync them too */ 387 if (pci_out_supported(q->irq_ptr)) 388 qdio_siga_sync_all(q); 389 else 390 qdio_siga_sync_q(q); 391 } 392 393 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr, 394 unsigned char *state) 395 { 396 if (need_siga_sync(q)) 397 qdio_siga_sync_q(q); 398 return get_buf_state(q, bufnr, state, 0); 399 } 400 401 static inline void qdio_stop_polling(struct qdio_q *q) 402 { 403 if (!q->u.in.batch_count) 404 return; 405 406 qperf_inc(q, stop_polling); 407 408 /* show the card that we are not polling anymore */ 409 set_buf_states(q, q->u.in.batch_start, SLSB_P_INPUT_NOT_INIT, 410 q->u.in.batch_count); 411 q->u.in.batch_count = 0; 412 } 413 414 static inline void account_sbals(struct qdio_q *q, unsigned int count) 415 { 416 q->q_stats.nr_sbal_total += count; 417 q->q_stats.nr_sbals[ilog2(count)]++; 418 } 419 420 static void process_buffer_error(struct qdio_q *q, unsigned int start, 421 int count) 422 { 423 q->qdio_error = QDIO_ERROR_SLSB_STATE; 424 425 /* special handling for no target buffer empty */ 426 if (queue_type(q) == QDIO_IQDIO_QFMT && !q->is_input_q && 427 q->sbal[start]->element[15].sflags == 0x10) { 428 qperf_inc(q, target_full); 429 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", start); 430 return; 431 } 432 433 DBF_ERROR("%4x BUF ERROR", SCH_NO(q)); 434 DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr); 435 DBF_ERROR("FTC:%3d C:%3d", start, count); 436 DBF_ERROR("F14:%2x F15:%2x", 437 q->sbal[start]->element[14].sflags, 438 q->sbal[start]->element[15].sflags); 439 } 440 441 static inline void inbound_handle_work(struct qdio_q *q, unsigned int start, 442 int count, bool auto_ack) 443 { 444 /* ACK the newest SBAL: */ 445 if (!auto_ack) 446 set_buf_state(q, add_buf(start, count - 1), SLSB_P_INPUT_ACK); 447 448 if (!q->u.in.batch_count) 449 q->u.in.batch_start = start; 450 q->u.in.batch_count += count; 451 } 452 453 static int get_inbound_buffer_frontier(struct qdio_q *q, unsigned int start) 454 { 455 unsigned char state = 0; 456 int count; 457 458 q->timestamp = get_tod_clock_fast(); 459 460 count = atomic_read(&q->nr_buf_used); 461 if (!count) 462 return 0; 463 464 /* 465 * No siga sync here, as a PCI or we after a thin interrupt 466 * already sync'ed the queues. 467 */ 468 count = get_buf_states(q, start, &state, count, 1, 0); 469 if (!count) 470 return 0; 471 472 switch (state) { 473 case SLSB_P_INPUT_PRIMED: 474 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr, 475 count); 476 477 inbound_handle_work(q, start, count, is_qebsm(q)); 478 if (atomic_sub_return(count, &q->nr_buf_used) == 0) 479 qperf_inc(q, inbound_queue_full); 480 if (q->irq_ptr->perf_stat_enabled) 481 account_sbals(q, count); 482 return count; 483 case SLSB_P_INPUT_ERROR: 484 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in err:%1d %02x", q->nr, 485 count); 486 487 process_buffer_error(q, start, count); 488 inbound_handle_work(q, start, count, false); 489 if (atomic_sub_return(count, &q->nr_buf_used) == 0) 490 qperf_inc(q, inbound_queue_full); 491 if (q->irq_ptr->perf_stat_enabled) 492 account_sbals_error(q, count); 493 return count; 494 case SLSB_CU_INPUT_EMPTY: 495 if (q->irq_ptr->perf_stat_enabled) 496 q->q_stats.nr_sbal_nop++; 497 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x", 498 q->nr, start); 499 return 0; 500 case SLSB_P_INPUT_NOT_INIT: 501 case SLSB_P_INPUT_ACK: 502 /* We should never see this state, throw a WARN: */ 503 default: 504 dev_WARN_ONCE(&q->irq_ptr->cdev->dev, 1, 505 "found state %#x at index %u on queue %u\n", 506 state, start, q->nr); 507 return 0; 508 } 509 } 510 511 static int qdio_inbound_q_moved(struct qdio_q *q, unsigned int start) 512 { 513 return get_inbound_buffer_frontier(q, start); 514 } 515 516 static inline int qdio_inbound_q_done(struct qdio_q *q, unsigned int start) 517 { 518 unsigned char state = 0; 519 520 if (!atomic_read(&q->nr_buf_used)) 521 return 1; 522 523 if (need_siga_sync(q)) 524 qdio_siga_sync_q(q); 525 get_buf_state(q, start, &state, 0); 526 527 if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR) 528 /* more work coming */ 529 return 0; 530 531 return 1; 532 } 533 534 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q, 535 int bufnr) 536 { 537 unsigned long phys_aob = 0; 538 539 if (!q->aobs[bufnr]) { 540 struct qaob *aob = qdio_allocate_aob(); 541 q->aobs[bufnr] = aob; 542 } 543 if (q->aobs[bufnr]) { 544 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user; 545 phys_aob = virt_to_phys(q->aobs[bufnr]); 546 WARN_ON_ONCE(phys_aob & 0xFF); 547 } 548 549 q->sbal_state[bufnr].flags = 0; 550 return phys_aob; 551 } 552 553 static void qdio_kick_handler(struct qdio_q *q, unsigned int start, 554 unsigned int count) 555 { 556 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) 557 return; 558 559 if (q->is_input_q) { 560 qperf_inc(q, inbound_handler); 561 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count); 562 } else { 563 qperf_inc(q, outbound_handler); 564 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x", 565 start, count); 566 } 567 568 q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count, 569 q->irq_ptr->int_parm); 570 571 /* for the next time */ 572 q->qdio_error = 0; 573 } 574 575 static inline int qdio_tasklet_schedule(struct qdio_q *q) 576 { 577 if (likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) { 578 tasklet_schedule(&q->tasklet); 579 return 0; 580 } 581 return -EPERM; 582 } 583 584 static void __qdio_inbound_processing(struct qdio_q *q) 585 { 586 unsigned int start = q->first_to_check; 587 int count; 588 589 qperf_inc(q, tasklet_inbound); 590 591 count = qdio_inbound_q_moved(q, start); 592 if (count == 0) 593 return; 594 595 qdio_kick_handler(q, start, count); 596 start = add_buf(start, count); 597 q->first_to_check = start; 598 599 if (!qdio_inbound_q_done(q, start)) { 600 /* means poll time is not yet over */ 601 qperf_inc(q, tasklet_inbound_resched); 602 if (!qdio_tasklet_schedule(q)) 603 return; 604 } 605 606 qdio_stop_polling(q); 607 /* 608 * We need to check again to not lose initiative after 609 * resetting the ACK state. 610 */ 611 if (!qdio_inbound_q_done(q, start)) { 612 qperf_inc(q, tasklet_inbound_resched2); 613 qdio_tasklet_schedule(q); 614 } 615 } 616 617 void qdio_inbound_processing(unsigned long data) 618 { 619 struct qdio_q *q = (struct qdio_q *)data; 620 __qdio_inbound_processing(q); 621 } 622 623 static void qdio_check_pending(struct qdio_q *q, unsigned int index) 624 { 625 unsigned char state; 626 627 if (get_buf_state(q, index, &state, 0) > 0 && 628 state == SLSB_P_OUTPUT_PENDING && 629 q->u.out.aobs[index]) { 630 q->u.out.sbal_state[index].flags |= 631 QDIO_OUTBUF_STATE_FLAG_PENDING; 632 q->u.out.aobs[index] = NULL; 633 } 634 } 635 636 static int get_outbound_buffer_frontier(struct qdio_q *q, unsigned int start) 637 { 638 unsigned char state = 0; 639 int count; 640 641 q->timestamp = get_tod_clock_fast(); 642 643 if (need_siga_sync(q)) 644 if (((queue_type(q) != QDIO_IQDIO_QFMT) && 645 !pci_out_supported(q->irq_ptr)) || 646 (queue_type(q) == QDIO_IQDIO_QFMT && 647 multicast_outbound(q))) 648 qdio_siga_sync_q(q); 649 650 count = atomic_read(&q->nr_buf_used); 651 if (!count) 652 return 0; 653 654 count = get_buf_states(q, start, &state, count, 0, q->u.out.use_cq); 655 if (!count) 656 return 0; 657 658 switch (state) { 659 case SLSB_P_OUTPUT_EMPTY: 660 case SLSB_P_OUTPUT_PENDING: 661 /* the adapter got it */ 662 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, 663 "out empty:%1d %02x", q->nr, count); 664 665 atomic_sub(count, &q->nr_buf_used); 666 if (q->irq_ptr->perf_stat_enabled) 667 account_sbals(q, count); 668 return count; 669 case SLSB_P_OUTPUT_ERROR: 670 process_buffer_error(q, start, count); 671 atomic_sub(count, &q->nr_buf_used); 672 if (q->irq_ptr->perf_stat_enabled) 673 account_sbals_error(q, count); 674 return count; 675 case SLSB_CU_OUTPUT_PRIMED: 676 /* the adapter has not fetched the output yet */ 677 if (q->irq_ptr->perf_stat_enabled) 678 q->q_stats.nr_sbal_nop++; 679 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", 680 q->nr); 681 return 0; 682 case SLSB_P_OUTPUT_HALTED: 683 return 0; 684 case SLSB_P_OUTPUT_NOT_INIT: 685 /* We should never see this state, throw a WARN: */ 686 default: 687 dev_WARN_ONCE(&q->irq_ptr->cdev->dev, 1, 688 "found state %#x at index %u on queue %u\n", 689 state, start, q->nr); 690 return 0; 691 } 692 } 693 694 /* all buffers processed? */ 695 static inline int qdio_outbound_q_done(struct qdio_q *q) 696 { 697 return atomic_read(&q->nr_buf_used) == 0; 698 } 699 700 static inline int qdio_outbound_q_moved(struct qdio_q *q, unsigned int start) 701 { 702 int count; 703 704 count = get_outbound_buffer_frontier(q, start); 705 706 if (count) { 707 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr); 708 709 if (q->u.out.use_cq) { 710 unsigned int i; 711 712 for (i = 0; i < count; i++) 713 qdio_check_pending(q, QDIO_BUFNR(start + i)); 714 } 715 } 716 717 return count; 718 } 719 720 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned int count, 721 unsigned long aob) 722 { 723 int retries = 0, cc; 724 unsigned int busy_bit; 725 726 if (!need_siga_out(q)) 727 return 0; 728 729 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr); 730 retry: 731 qperf_inc(q, siga_write); 732 733 cc = qdio_siga_output(q, count, &busy_bit, aob); 734 switch (cc) { 735 case 0: 736 break; 737 case 2: 738 if (busy_bit) { 739 while (++retries < QDIO_BUSY_BIT_RETRIES) { 740 mdelay(QDIO_BUSY_BIT_RETRY_DELAY); 741 goto retry; 742 } 743 DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr); 744 cc = -EBUSY; 745 } else { 746 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr); 747 cc = -ENOBUFS; 748 } 749 break; 750 case 1: 751 case 3: 752 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc); 753 cc = -EIO; 754 break; 755 } 756 if (retries) { 757 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr); 758 DBF_ERROR("count:%u", retries); 759 } 760 return cc; 761 } 762 763 static void __qdio_outbound_processing(struct qdio_q *q) 764 { 765 unsigned int start = q->first_to_check; 766 int count; 767 768 qperf_inc(q, tasklet_outbound); 769 WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0); 770 771 count = qdio_outbound_q_moved(q, start); 772 if (count) { 773 q->first_to_check = add_buf(start, count); 774 qdio_kick_handler(q, start, count); 775 } 776 777 if (queue_type(q) == QDIO_ZFCP_QFMT && !pci_out_supported(q->irq_ptr) && 778 !qdio_outbound_q_done(q)) 779 goto sched; 780 781 if (q->u.out.pci_out_enabled) 782 return; 783 784 /* 785 * Now we know that queue type is either qeth without pci enabled 786 * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY 787 * is noticed and outbound_handler is called after some time. 788 */ 789 if (qdio_outbound_q_done(q)) 790 del_timer_sync(&q->u.out.timer); 791 else 792 if (!timer_pending(&q->u.out.timer) && 793 likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) 794 mod_timer(&q->u.out.timer, jiffies + 10 * HZ); 795 return; 796 797 sched: 798 qdio_tasklet_schedule(q); 799 } 800 801 /* outbound tasklet */ 802 void qdio_outbound_processing(unsigned long data) 803 { 804 struct qdio_q *q = (struct qdio_q *)data; 805 __qdio_outbound_processing(q); 806 } 807 808 void qdio_outbound_timer(struct timer_list *t) 809 { 810 struct qdio_q *q = from_timer(q, t, u.out.timer); 811 812 qdio_tasklet_schedule(q); 813 } 814 815 static inline void qdio_check_outbound_pci_queues(struct qdio_irq *irq) 816 { 817 struct qdio_q *out; 818 int i; 819 820 if (!pci_out_supported(irq) || !irq->scan_threshold) 821 return; 822 823 for_each_output_queue(irq, out, i) 824 if (!qdio_outbound_q_done(out)) 825 qdio_tasklet_schedule(out); 826 } 827 828 void tiqdio_inbound_processing(unsigned long data) 829 { 830 struct qdio_q *q = (struct qdio_q *)data; 831 832 if (need_siga_sync(q) && need_siga_sync_after_ai(q)) 833 qdio_sync_queues(q); 834 835 /* The interrupt could be caused by a PCI request: */ 836 qdio_check_outbound_pci_queues(q->irq_ptr); 837 838 __qdio_inbound_processing(q); 839 } 840 841 static inline void qdio_set_state(struct qdio_irq *irq_ptr, 842 enum qdio_irq_states state) 843 { 844 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state); 845 846 irq_ptr->state = state; 847 mb(); 848 } 849 850 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb) 851 { 852 if (irb->esw.esw0.erw.cons) { 853 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no); 854 DBF_ERROR_HEX(irb, 64); 855 DBF_ERROR_HEX(irb->ecw, 64); 856 } 857 } 858 859 /* PCI interrupt handler */ 860 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr) 861 { 862 int i; 863 struct qdio_q *q; 864 865 if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) 866 return; 867 868 if (irq_ptr->irq_poll) { 869 if (!test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state)) 870 irq_ptr->irq_poll(irq_ptr->cdev, irq_ptr->int_parm); 871 else 872 QDIO_PERF_STAT_INC(irq_ptr, int_discarded); 873 } else { 874 for_each_input_queue(irq_ptr, q, i) 875 tasklet_schedule(&q->tasklet); 876 } 877 878 if (!pci_out_supported(irq_ptr) || !irq_ptr->scan_threshold) 879 return; 880 881 for_each_output_queue(irq_ptr, q, i) { 882 if (qdio_outbound_q_done(q)) 883 continue; 884 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q)) 885 qdio_siga_sync_q(q); 886 qdio_tasklet_schedule(q); 887 } 888 } 889 890 static void qdio_handle_activate_check(struct qdio_irq *irq_ptr, 891 unsigned long intparm, int cstat, 892 int dstat) 893 { 894 struct qdio_q *q; 895 896 DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no); 897 DBF_ERROR("intp :%lx", intparm); 898 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); 899 900 if (irq_ptr->nr_input_qs) { 901 q = irq_ptr->input_qs[0]; 902 } else if (irq_ptr->nr_output_qs) { 903 q = irq_ptr->output_qs[0]; 904 } else { 905 dump_stack(); 906 goto no_handler; 907 } 908 909 q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE, 910 q->nr, q->first_to_check, 0, irq_ptr->int_parm); 911 no_handler: 912 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); 913 /* 914 * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen. 915 * Therefore we call the LGR detection function here. 916 */ 917 lgr_info_log(); 918 } 919 920 static void qdio_establish_handle_irq(struct qdio_irq *irq_ptr, int cstat, 921 int dstat) 922 { 923 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq"); 924 925 if (cstat) 926 goto error; 927 if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END)) 928 goto error; 929 if (!(dstat & DEV_STAT_DEV_END)) 930 goto error; 931 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED); 932 return; 933 934 error: 935 DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no); 936 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); 937 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); 938 } 939 940 /* qdio interrupt handler */ 941 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm, 942 struct irb *irb) 943 { 944 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 945 struct subchannel_id schid; 946 int cstat, dstat; 947 948 if (!intparm || !irq_ptr) { 949 ccw_device_get_schid(cdev, &schid); 950 DBF_ERROR("qint:%4x", schid.sch_no); 951 return; 952 } 953 954 if (irq_ptr->perf_stat_enabled) 955 irq_ptr->perf_stat.qdio_int++; 956 957 if (IS_ERR(irb)) { 958 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no); 959 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); 960 wake_up(&cdev->private->wait_q); 961 return; 962 } 963 qdio_irq_check_sense(irq_ptr, irb); 964 cstat = irb->scsw.cmd.cstat; 965 dstat = irb->scsw.cmd.dstat; 966 967 switch (irq_ptr->state) { 968 case QDIO_IRQ_STATE_INACTIVE: 969 qdio_establish_handle_irq(irq_ptr, cstat, dstat); 970 break; 971 case QDIO_IRQ_STATE_CLEANUP: 972 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); 973 break; 974 case QDIO_IRQ_STATE_ESTABLISHED: 975 case QDIO_IRQ_STATE_ACTIVE: 976 if (cstat & SCHN_STAT_PCI) { 977 qdio_int_handler_pci(irq_ptr); 978 return; 979 } 980 if (cstat || dstat) 981 qdio_handle_activate_check(irq_ptr, intparm, cstat, 982 dstat); 983 break; 984 case QDIO_IRQ_STATE_STOPPED: 985 break; 986 default: 987 WARN_ON_ONCE(1); 988 } 989 wake_up(&cdev->private->wait_q); 990 } 991 992 /** 993 * qdio_get_ssqd_desc - get qdio subchannel description 994 * @cdev: ccw device to get description for 995 * @data: where to store the ssqd 996 * 997 * Returns 0 or an error code. The results of the chsc are stored in the 998 * specified structure. 999 */ 1000 int qdio_get_ssqd_desc(struct ccw_device *cdev, 1001 struct qdio_ssqd_desc *data) 1002 { 1003 struct subchannel_id schid; 1004 1005 if (!cdev || !cdev->private) 1006 return -EINVAL; 1007 1008 ccw_device_get_schid(cdev, &schid); 1009 DBF_EVENT("get ssqd:%4x", schid.sch_no); 1010 return qdio_setup_get_ssqd(NULL, &schid, data); 1011 } 1012 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc); 1013 1014 static void qdio_shutdown_queues(struct qdio_irq *irq_ptr) 1015 { 1016 struct qdio_q *q; 1017 int i; 1018 1019 for_each_input_queue(irq_ptr, q, i) 1020 tasklet_kill(&q->tasklet); 1021 1022 for_each_output_queue(irq_ptr, q, i) { 1023 del_timer_sync(&q->u.out.timer); 1024 tasklet_kill(&q->tasklet); 1025 } 1026 } 1027 1028 /** 1029 * qdio_shutdown - shut down a qdio subchannel 1030 * @cdev: associated ccw device 1031 * @how: use halt or clear to shutdown 1032 */ 1033 int qdio_shutdown(struct ccw_device *cdev, int how) 1034 { 1035 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1036 struct subchannel_id schid; 1037 int rc; 1038 1039 if (!irq_ptr) 1040 return -ENODEV; 1041 1042 WARN_ON_ONCE(irqs_disabled()); 1043 ccw_device_get_schid(cdev, &schid); 1044 DBF_EVENT("qshutdown:%4x", schid.sch_no); 1045 1046 mutex_lock(&irq_ptr->setup_mutex); 1047 /* 1048 * Subchannel was already shot down. We cannot prevent being called 1049 * twice since cio may trigger a shutdown asynchronously. 1050 */ 1051 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { 1052 mutex_unlock(&irq_ptr->setup_mutex); 1053 return 0; 1054 } 1055 1056 /* 1057 * Indicate that the device is going down. Scheduling the queue 1058 * tasklets is forbidden from here on. 1059 */ 1060 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); 1061 1062 tiqdio_remove_device(irq_ptr); 1063 qdio_shutdown_queues(irq_ptr); 1064 qdio_shutdown_debug_entries(irq_ptr); 1065 1066 /* cleanup subchannel */ 1067 spin_lock_irq(get_ccwdev_lock(cdev)); 1068 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP); 1069 if (how & QDIO_FLAG_CLEANUP_USING_CLEAR) 1070 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP); 1071 else 1072 /* default behaviour is halt */ 1073 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP); 1074 spin_unlock_irq(get_ccwdev_lock(cdev)); 1075 if (rc) { 1076 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no); 1077 DBF_ERROR("rc:%4d", rc); 1078 goto no_cleanup; 1079 } 1080 1081 wait_event_interruptible_timeout(cdev->private->wait_q, 1082 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE || 1083 irq_ptr->state == QDIO_IRQ_STATE_ERR, 1084 10 * HZ); 1085 1086 no_cleanup: 1087 qdio_shutdown_thinint(irq_ptr); 1088 qdio_shutdown_irq(irq_ptr); 1089 1090 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); 1091 mutex_unlock(&irq_ptr->setup_mutex); 1092 if (rc) 1093 return rc; 1094 return 0; 1095 } 1096 EXPORT_SYMBOL_GPL(qdio_shutdown); 1097 1098 /** 1099 * qdio_free - free data structures for a qdio subchannel 1100 * @cdev: associated ccw device 1101 */ 1102 int qdio_free(struct ccw_device *cdev) 1103 { 1104 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1105 struct subchannel_id schid; 1106 1107 if (!irq_ptr) 1108 return -ENODEV; 1109 1110 ccw_device_get_schid(cdev, &schid); 1111 DBF_EVENT("qfree:%4x", schid.sch_no); 1112 DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned"); 1113 mutex_lock(&irq_ptr->setup_mutex); 1114 1115 irq_ptr->debug_area = NULL; 1116 cdev->private->qdio_data = NULL; 1117 mutex_unlock(&irq_ptr->setup_mutex); 1118 1119 qdio_free_async_data(irq_ptr); 1120 qdio_free_queues(irq_ptr); 1121 free_page((unsigned long) irq_ptr->qdr); 1122 free_page(irq_ptr->chsc_page); 1123 free_page((unsigned long) irq_ptr); 1124 return 0; 1125 } 1126 EXPORT_SYMBOL_GPL(qdio_free); 1127 1128 /** 1129 * qdio_allocate - allocate qdio queues and associated data 1130 * @cdev: associated ccw device 1131 * @no_input_qs: allocate this number of Input Queues 1132 * @no_output_qs: allocate this number of Output Queues 1133 */ 1134 int qdio_allocate(struct ccw_device *cdev, unsigned int no_input_qs, 1135 unsigned int no_output_qs) 1136 { 1137 struct subchannel_id schid; 1138 struct qdio_irq *irq_ptr; 1139 int rc = -ENOMEM; 1140 1141 ccw_device_get_schid(cdev, &schid); 1142 DBF_EVENT("qallocate:%4x", schid.sch_no); 1143 1144 if (no_input_qs > QDIO_MAX_QUEUES_PER_IRQ || 1145 no_output_qs > QDIO_MAX_QUEUES_PER_IRQ) 1146 return -EINVAL; 1147 1148 /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */ 1149 irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 1150 if (!irq_ptr) 1151 return -ENOMEM; 1152 1153 irq_ptr->cdev = cdev; 1154 mutex_init(&irq_ptr->setup_mutex); 1155 if (qdio_allocate_dbf(irq_ptr)) 1156 goto err_dbf; 1157 1158 DBF_DEV_EVENT(DBF_ERR, irq_ptr, "alloc niq:%1u noq:%1u", no_input_qs, 1159 no_output_qs); 1160 1161 /* 1162 * Allocate a page for the chsc calls in qdio_establish. 1163 * Must be pre-allocated since a zfcp recovery will call 1164 * qdio_establish. In case of low memory and swap on a zfcp disk 1165 * we may not be able to allocate memory otherwise. 1166 */ 1167 irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL); 1168 if (!irq_ptr->chsc_page) 1169 goto err_chsc; 1170 1171 /* qdr is used in ccw1.cda which is u32 */ 1172 irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 1173 if (!irq_ptr->qdr) 1174 goto err_qdr; 1175 1176 rc = qdio_allocate_qs(irq_ptr, no_input_qs, no_output_qs); 1177 if (rc) 1178 goto err_queues; 1179 1180 INIT_LIST_HEAD(&irq_ptr->entry); 1181 cdev->private->qdio_data = irq_ptr; 1182 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); 1183 return 0; 1184 1185 err_queues: 1186 free_page((unsigned long) irq_ptr->qdr); 1187 err_qdr: 1188 free_page(irq_ptr->chsc_page); 1189 err_chsc: 1190 err_dbf: 1191 free_page((unsigned long) irq_ptr); 1192 return rc; 1193 } 1194 EXPORT_SYMBOL_GPL(qdio_allocate); 1195 1196 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr) 1197 { 1198 struct qdio_q *q = irq_ptr->input_qs[0]; 1199 int i, use_cq = 0; 1200 1201 if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT) 1202 use_cq = 1; 1203 1204 for_each_output_queue(irq_ptr, q, i) { 1205 if (use_cq) { 1206 if (multicast_outbound(q)) 1207 continue; 1208 if (qdio_enable_async_operation(&q->u.out) < 0) { 1209 use_cq = 0; 1210 continue; 1211 } 1212 } else 1213 qdio_disable_async_operation(&q->u.out); 1214 } 1215 DBF_EVENT("use_cq:%d", use_cq); 1216 } 1217 1218 static void qdio_trace_init_data(struct qdio_irq *irq, 1219 struct qdio_initialize *data) 1220 { 1221 DBF_DEV_EVENT(DBF_ERR, irq, "qfmt:%1u", data->q_format); 1222 DBF_DEV_EVENT(DBF_ERR, irq, "qpff%4x", data->qib_param_field_format); 1223 DBF_DEV_HEX(irq, &data->qib_param_field, sizeof(void *), DBF_ERR); 1224 DBF_DEV_HEX(irq, &data->input_slib_elements, sizeof(void *), DBF_ERR); 1225 DBF_DEV_HEX(irq, &data->output_slib_elements, sizeof(void *), DBF_ERR); 1226 DBF_DEV_EVENT(DBF_ERR, irq, "niq:%1u noq:%1u", data->no_input_qs, 1227 data->no_output_qs); 1228 DBF_DEV_HEX(irq, &data->input_handler, sizeof(void *), DBF_ERR); 1229 DBF_DEV_HEX(irq, &data->output_handler, sizeof(void *), DBF_ERR); 1230 DBF_DEV_HEX(irq, &data->int_parm, sizeof(long), DBF_ERR); 1231 DBF_DEV_HEX(irq, &data->input_sbal_addr_array, sizeof(void *), DBF_ERR); 1232 DBF_DEV_HEX(irq, &data->output_sbal_addr_array, sizeof(void *), 1233 DBF_ERR); 1234 } 1235 1236 /** 1237 * qdio_establish - establish queues on a qdio subchannel 1238 * @cdev: associated ccw device 1239 * @init_data: initialization data 1240 */ 1241 int qdio_establish(struct ccw_device *cdev, 1242 struct qdio_initialize *init_data) 1243 { 1244 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1245 struct subchannel_id schid; 1246 int rc; 1247 1248 ccw_device_get_schid(cdev, &schid); 1249 DBF_EVENT("qestablish:%4x", schid.sch_no); 1250 1251 if (!irq_ptr) 1252 return -ENODEV; 1253 1254 if (init_data->no_input_qs > irq_ptr->max_input_qs || 1255 init_data->no_output_qs > irq_ptr->max_output_qs) 1256 return -EINVAL; 1257 1258 if ((init_data->no_input_qs && !init_data->input_handler) || 1259 (init_data->no_output_qs && !init_data->output_handler)) 1260 return -EINVAL; 1261 1262 if (!init_data->input_sbal_addr_array || 1263 !init_data->output_sbal_addr_array) 1264 return -EINVAL; 1265 1266 mutex_lock(&irq_ptr->setup_mutex); 1267 qdio_trace_init_data(irq_ptr, init_data); 1268 qdio_setup_irq(irq_ptr, init_data); 1269 1270 rc = qdio_establish_thinint(irq_ptr); 1271 if (rc) { 1272 qdio_shutdown_irq(irq_ptr); 1273 mutex_unlock(&irq_ptr->setup_mutex); 1274 return rc; 1275 } 1276 1277 /* establish q */ 1278 irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd; 1279 irq_ptr->ccw.flags = CCW_FLAG_SLI; 1280 irq_ptr->ccw.count = irq_ptr->equeue.count; 1281 irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr); 1282 1283 spin_lock_irq(get_ccwdev_lock(cdev)); 1284 ccw_device_set_options_mask(cdev, 0); 1285 1286 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0); 1287 spin_unlock_irq(get_ccwdev_lock(cdev)); 1288 if (rc) { 1289 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no); 1290 DBF_ERROR("rc:%4x", rc); 1291 qdio_shutdown_thinint(irq_ptr); 1292 qdio_shutdown_irq(irq_ptr); 1293 mutex_unlock(&irq_ptr->setup_mutex); 1294 return rc; 1295 } 1296 1297 wait_event_interruptible_timeout(cdev->private->wait_q, 1298 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED || 1299 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ); 1300 1301 if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) { 1302 mutex_unlock(&irq_ptr->setup_mutex); 1303 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); 1304 return -EIO; 1305 } 1306 1307 qdio_setup_ssqd_info(irq_ptr); 1308 1309 qdio_detect_hsicq(irq_ptr); 1310 1311 /* qebsm is now setup if available, initialize buffer states */ 1312 qdio_init_buf_states(irq_ptr); 1313 1314 mutex_unlock(&irq_ptr->setup_mutex); 1315 qdio_print_subchannel_info(irq_ptr); 1316 qdio_setup_debug_entries(irq_ptr); 1317 return 0; 1318 } 1319 EXPORT_SYMBOL_GPL(qdio_establish); 1320 1321 /** 1322 * qdio_activate - activate queues on a qdio subchannel 1323 * @cdev: associated cdev 1324 */ 1325 int qdio_activate(struct ccw_device *cdev) 1326 { 1327 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1328 struct subchannel_id schid; 1329 int rc; 1330 1331 ccw_device_get_schid(cdev, &schid); 1332 DBF_EVENT("qactivate:%4x", schid.sch_no); 1333 1334 if (!irq_ptr) 1335 return -ENODEV; 1336 1337 mutex_lock(&irq_ptr->setup_mutex); 1338 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { 1339 rc = -EBUSY; 1340 goto out; 1341 } 1342 1343 irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd; 1344 irq_ptr->ccw.flags = CCW_FLAG_SLI; 1345 irq_ptr->ccw.count = irq_ptr->aqueue.count; 1346 irq_ptr->ccw.cda = 0; 1347 1348 spin_lock_irq(get_ccwdev_lock(cdev)); 1349 ccw_device_set_options(cdev, CCWDEV_REPORT_ALL); 1350 1351 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE, 1352 0, DOIO_DENY_PREFETCH); 1353 spin_unlock_irq(get_ccwdev_lock(cdev)); 1354 if (rc) { 1355 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no); 1356 DBF_ERROR("rc:%4x", rc); 1357 goto out; 1358 } 1359 1360 if (is_thinint_irq(irq_ptr)) 1361 tiqdio_add_device(irq_ptr); 1362 1363 /* wait for subchannel to become active */ 1364 msleep(5); 1365 1366 switch (irq_ptr->state) { 1367 case QDIO_IRQ_STATE_STOPPED: 1368 case QDIO_IRQ_STATE_ERR: 1369 rc = -EIO; 1370 break; 1371 default: 1372 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE); 1373 rc = 0; 1374 } 1375 out: 1376 mutex_unlock(&irq_ptr->setup_mutex); 1377 return rc; 1378 } 1379 EXPORT_SYMBOL_GPL(qdio_activate); 1380 1381 /** 1382 * handle_inbound - reset processed input buffers 1383 * @q: queue containing the buffers 1384 * @callflags: flags 1385 * @bufnr: first buffer to process 1386 * @count: how many buffers are emptied 1387 */ 1388 static int handle_inbound(struct qdio_q *q, unsigned int callflags, 1389 int bufnr, int count) 1390 { 1391 int overlap; 1392 1393 qperf_inc(q, inbound_call); 1394 1395 /* If any processed SBALs are returned to HW, adjust our tracking: */ 1396 overlap = min_t(int, count - sub_buf(q->u.in.batch_start, bufnr), 1397 q->u.in.batch_count); 1398 if (overlap > 0) { 1399 q->u.in.batch_start = add_buf(q->u.in.batch_start, overlap); 1400 q->u.in.batch_count -= overlap; 1401 } 1402 1403 count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count); 1404 atomic_add(count, &q->nr_buf_used); 1405 1406 if (need_siga_in(q)) 1407 return qdio_siga_input(q); 1408 1409 return 0; 1410 } 1411 1412 /** 1413 * handle_outbound - process filled outbound buffers 1414 * @q: queue containing the buffers 1415 * @callflags: flags 1416 * @bufnr: first buffer to process 1417 * @count: how many buffers are filled 1418 */ 1419 static int handle_outbound(struct qdio_q *q, unsigned int callflags, 1420 unsigned int bufnr, unsigned int count) 1421 { 1422 const unsigned int scan_threshold = q->irq_ptr->scan_threshold; 1423 unsigned char state = 0; 1424 int used, rc = 0; 1425 1426 qperf_inc(q, outbound_call); 1427 1428 count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count); 1429 used = atomic_add_return(count, &q->nr_buf_used); 1430 1431 if (used == QDIO_MAX_BUFFERS_PER_Q) 1432 qperf_inc(q, outbound_queue_full); 1433 1434 if (callflags & QDIO_FLAG_PCI_OUT) { 1435 q->u.out.pci_out_enabled = 1; 1436 qperf_inc(q, pci_request_int); 1437 } else 1438 q->u.out.pci_out_enabled = 0; 1439 1440 if (queue_type(q) == QDIO_IQDIO_QFMT) { 1441 unsigned long phys_aob = 0; 1442 1443 if (q->u.out.use_cq && count == 1) 1444 phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr); 1445 1446 rc = qdio_kick_outbound_q(q, count, phys_aob); 1447 } else if (need_siga_sync(q)) { 1448 rc = qdio_siga_sync_q(q); 1449 } else if (count < QDIO_MAX_BUFFERS_PER_Q && 1450 get_buf_state(q, prev_buf(bufnr), &state, 0) > 0 && 1451 state == SLSB_CU_OUTPUT_PRIMED) { 1452 /* The previous buffer is not processed yet, tack on. */ 1453 qperf_inc(q, fast_requeue); 1454 } else { 1455 rc = qdio_kick_outbound_q(q, count, 0); 1456 } 1457 1458 /* Let drivers implement their own completion scanning: */ 1459 if (!scan_threshold) 1460 return rc; 1461 1462 /* in case of SIGA errors we must process the error immediately */ 1463 if (used >= scan_threshold || rc) 1464 qdio_tasklet_schedule(q); 1465 else 1466 /* free the SBALs in case of no further traffic */ 1467 if (!timer_pending(&q->u.out.timer) && 1468 likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) 1469 mod_timer(&q->u.out.timer, jiffies + HZ); 1470 return rc; 1471 } 1472 1473 /** 1474 * do_QDIO - process input or output buffers 1475 * @cdev: associated ccw_device for the qdio subchannel 1476 * @callflags: input or output and special flags from the program 1477 * @q_nr: queue number 1478 * @bufnr: buffer number 1479 * @count: how many buffers to process 1480 */ 1481 int do_QDIO(struct ccw_device *cdev, unsigned int callflags, 1482 int q_nr, unsigned int bufnr, unsigned int count) 1483 { 1484 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1485 1486 if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q) 1487 return -EINVAL; 1488 1489 if (!irq_ptr) 1490 return -ENODEV; 1491 1492 DBF_DEV_EVENT(DBF_INFO, irq_ptr, 1493 "do%02x b:%02x c:%02x", callflags, bufnr, count); 1494 1495 if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE) 1496 return -EIO; 1497 if (!count) 1498 return 0; 1499 if (callflags & QDIO_FLAG_SYNC_INPUT) 1500 return handle_inbound(irq_ptr->input_qs[q_nr], 1501 callflags, bufnr, count); 1502 else if (callflags & QDIO_FLAG_SYNC_OUTPUT) 1503 return handle_outbound(irq_ptr->output_qs[q_nr], 1504 callflags, bufnr, count); 1505 return -EINVAL; 1506 } 1507 EXPORT_SYMBOL_GPL(do_QDIO); 1508 1509 /** 1510 * qdio_start_irq - enable interrupt processing for the device 1511 * @cdev: associated ccw_device for the qdio subchannel 1512 * 1513 * Return codes 1514 * 0 - success 1515 * 1 - irqs not started since new data is available 1516 */ 1517 int qdio_start_irq(struct ccw_device *cdev) 1518 { 1519 struct qdio_q *q; 1520 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1521 unsigned int i; 1522 1523 if (!irq_ptr) 1524 return -ENODEV; 1525 1526 for_each_input_queue(irq_ptr, q, i) 1527 qdio_stop_polling(q); 1528 1529 clear_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state); 1530 1531 /* 1532 * We need to check again to not lose initiative after 1533 * resetting the ACK state. 1534 */ 1535 if (test_nonshared_ind(irq_ptr)) 1536 goto rescan; 1537 1538 for_each_input_queue(irq_ptr, q, i) { 1539 if (!qdio_inbound_q_done(q, q->first_to_check)) 1540 goto rescan; 1541 } 1542 1543 return 0; 1544 1545 rescan: 1546 if (test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state)) 1547 return 0; 1548 else 1549 return 1; 1550 1551 } 1552 EXPORT_SYMBOL(qdio_start_irq); 1553 1554 static int __qdio_inspect_queue(struct qdio_q *q, unsigned int *bufnr, 1555 unsigned int *error) 1556 { 1557 unsigned int start = q->first_to_check; 1558 int count; 1559 1560 count = q->is_input_q ? qdio_inbound_q_moved(q, start) : 1561 qdio_outbound_q_moved(q, start); 1562 if (count == 0) 1563 return 0; 1564 1565 *bufnr = start; 1566 *error = q->qdio_error; 1567 1568 /* for the next time */ 1569 q->first_to_check = add_buf(start, count); 1570 q->qdio_error = 0; 1571 1572 return count; 1573 } 1574 1575 int qdio_inspect_queue(struct ccw_device *cdev, unsigned int nr, bool is_input, 1576 unsigned int *bufnr, unsigned int *error) 1577 { 1578 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1579 struct qdio_q *q; 1580 1581 if (!irq_ptr) 1582 return -ENODEV; 1583 q = is_input ? irq_ptr->input_qs[nr] : irq_ptr->output_qs[nr]; 1584 1585 if (need_siga_sync(q)) 1586 qdio_siga_sync_q(q); 1587 1588 return __qdio_inspect_queue(q, bufnr, error); 1589 } 1590 EXPORT_SYMBOL_GPL(qdio_inspect_queue); 1591 1592 /** 1593 * qdio_get_next_buffers - process input buffers 1594 * @cdev: associated ccw_device for the qdio subchannel 1595 * @nr: input queue number 1596 * @bufnr: first filled buffer number 1597 * @error: buffers are in error state 1598 * 1599 * Return codes 1600 * < 0 - error 1601 * = 0 - no new buffers found 1602 * > 0 - number of processed buffers 1603 */ 1604 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr, 1605 int *error) 1606 { 1607 struct qdio_q *q; 1608 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1609 1610 if (!irq_ptr) 1611 return -ENODEV; 1612 q = irq_ptr->input_qs[nr]; 1613 1614 /* 1615 * Cannot rely on automatic sync after interrupt since queues may 1616 * also be examined without interrupt. 1617 */ 1618 if (need_siga_sync(q)) 1619 qdio_sync_queues(q); 1620 1621 qdio_check_outbound_pci_queues(irq_ptr); 1622 1623 /* Note: upper-layer MUST stop processing immediately here ... */ 1624 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) 1625 return -EIO; 1626 1627 return __qdio_inspect_queue(q, bufnr, error); 1628 } 1629 EXPORT_SYMBOL(qdio_get_next_buffers); 1630 1631 /** 1632 * qdio_stop_irq - disable interrupt processing for the device 1633 * @cdev: associated ccw_device for the qdio subchannel 1634 * 1635 * Return codes 1636 * 0 - interrupts were already disabled 1637 * 1 - interrupts successfully disabled 1638 */ 1639 int qdio_stop_irq(struct ccw_device *cdev) 1640 { 1641 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1642 1643 if (!irq_ptr) 1644 return -ENODEV; 1645 1646 if (test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state)) 1647 return 0; 1648 else 1649 return 1; 1650 } 1651 EXPORT_SYMBOL(qdio_stop_irq); 1652 1653 static int __init init_QDIO(void) 1654 { 1655 int rc; 1656 1657 rc = qdio_debug_init(); 1658 if (rc) 1659 return rc; 1660 rc = qdio_setup_init(); 1661 if (rc) 1662 goto out_debug; 1663 rc = qdio_thinint_init(); 1664 if (rc) 1665 goto out_cache; 1666 return 0; 1667 1668 out_cache: 1669 qdio_setup_exit(); 1670 out_debug: 1671 qdio_debug_exit(); 1672 return rc; 1673 } 1674 1675 static void __exit exit_QDIO(void) 1676 { 1677 qdio_thinint_exit(); 1678 qdio_setup_exit(); 1679 qdio_debug_exit(); 1680 } 1681 1682 module_init(init_QDIO); 1683 module_exit(exit_QDIO); 1684