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.ack_count) 397 return; 398 399 qperf_inc(q, stop_polling); 400 401 /* show the card that we are not polling anymore */ 402 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, 403 q->u.in.ack_count); 404 q->u.in.ack_count = 0; 405 } 406 407 static inline void account_sbals(struct qdio_q *q, unsigned int count) 408 { 409 int pos; 410 411 q->q_stats.nr_sbal_total += count; 412 if (count == QDIO_MAX_BUFFERS_MASK) { 413 q->q_stats.nr_sbals[7]++; 414 return; 415 } 416 pos = ilog2(count); 417 q->q_stats.nr_sbals[pos]++; 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_primed(struct qdio_q *q, unsigned int start, 442 int count) 443 { 444 int new; 445 446 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr, count); 447 448 /* for QEBSM the ACK was already set by EQBS */ 449 if (is_qebsm(q)) { 450 if (!q->u.in.ack_count) { 451 q->u.in.ack_count = count; 452 q->u.in.ack_start = start; 453 return; 454 } 455 456 /* delete the previous ACK's */ 457 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, 458 q->u.in.ack_count); 459 q->u.in.ack_count = count; 460 q->u.in.ack_start = start; 461 return; 462 } 463 464 /* 465 * ACK the newest buffer. The ACK will be removed in qdio_stop_polling 466 * or by the next inbound run. 467 */ 468 new = add_buf(start, count - 1); 469 if (q->u.in.ack_count) { 470 /* reset the previous ACK but first set the new one */ 471 set_buf_state(q, new, SLSB_P_INPUT_ACK); 472 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); 473 } else { 474 q->u.in.ack_count = 1; 475 set_buf_state(q, new, SLSB_P_INPUT_ACK); 476 } 477 478 q->u.in.ack_start = new; 479 count--; 480 if (!count) 481 return; 482 /* need to change ALL buffers to get more interrupts */ 483 set_buf_states(q, start, SLSB_P_INPUT_NOT_INIT, count); 484 } 485 486 static int get_inbound_buffer_frontier(struct qdio_q *q, unsigned int start) 487 { 488 unsigned char state = 0; 489 int count; 490 491 q->timestamp = get_tod_clock_fast(); 492 493 /* 494 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved 495 * would return 0. 496 */ 497 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); 498 if (!count) 499 return 0; 500 501 /* 502 * No siga sync here, as a PCI or we after a thin interrupt 503 * already sync'ed the queues. 504 */ 505 count = get_buf_states(q, start, &state, count, 1, 0); 506 if (!count) 507 return 0; 508 509 switch (state) { 510 case SLSB_P_INPUT_PRIMED: 511 inbound_primed(q, start, count); 512 if (atomic_sub_return(count, &q->nr_buf_used) == 0) 513 qperf_inc(q, inbound_queue_full); 514 if (q->irq_ptr->perf_stat_enabled) 515 account_sbals(q, count); 516 return count; 517 case SLSB_P_INPUT_ERROR: 518 process_buffer_error(q, start, count); 519 /* 520 * Interrupts may be avoided as long as the error is present 521 * so change the buffer state immediately to avoid starvation. 522 */ 523 set_buf_states(q, start, SLSB_P_INPUT_NOT_INIT, count); 524 if (atomic_sub_return(count, &q->nr_buf_used) == 0) 525 qperf_inc(q, inbound_queue_full); 526 if (q->irq_ptr->perf_stat_enabled) 527 account_sbals_error(q, count); 528 return count; 529 case SLSB_CU_INPUT_EMPTY: 530 case SLSB_P_INPUT_NOT_INIT: 531 case SLSB_P_INPUT_ACK: 532 if (q->irq_ptr->perf_stat_enabled) 533 q->q_stats.nr_sbal_nop++; 534 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x", 535 q->nr, start); 536 return 0; 537 default: 538 WARN_ON_ONCE(1); 539 return 0; 540 } 541 } 542 543 static int qdio_inbound_q_moved(struct qdio_q *q, unsigned int start) 544 { 545 int count; 546 547 count = get_inbound_buffer_frontier(q, start); 548 549 if (count && !is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR) 550 q->u.in.timestamp = get_tod_clock(); 551 552 return count; 553 } 554 555 static inline int qdio_inbound_q_done(struct qdio_q *q, unsigned int start) 556 { 557 unsigned char state = 0; 558 559 if (!atomic_read(&q->nr_buf_used)) 560 return 1; 561 562 if (need_siga_sync(q)) 563 qdio_siga_sync_q(q); 564 get_buf_state(q, start, &state, 0); 565 566 if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR) 567 /* more work coming */ 568 return 0; 569 570 if (is_thinint_irq(q->irq_ptr)) 571 return 1; 572 573 /* don't poll under z/VM */ 574 if (MACHINE_IS_VM) 575 return 1; 576 577 /* 578 * At this point we know, that inbound first_to_check 579 * has (probably) not moved (see qdio_inbound_processing). 580 */ 581 if (get_tod_clock_fast() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) { 582 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x", start); 583 return 1; 584 } else 585 return 0; 586 } 587 588 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count) 589 { 590 unsigned char state = 0; 591 int j, b = start; 592 593 for (j = 0; j < count; ++j) { 594 get_buf_state(q, b, &state, 0); 595 if (state == SLSB_P_OUTPUT_PENDING) { 596 struct qaob *aob = q->u.out.aobs[b]; 597 if (aob == NULL) 598 continue; 599 600 q->u.out.sbal_state[b].flags |= 601 QDIO_OUTBUF_STATE_FLAG_PENDING; 602 q->u.out.aobs[b] = NULL; 603 } 604 b = next_buf(b); 605 } 606 } 607 608 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q, 609 int bufnr) 610 { 611 unsigned long phys_aob = 0; 612 613 if (!q->aobs[bufnr]) { 614 struct qaob *aob = qdio_allocate_aob(); 615 q->aobs[bufnr] = aob; 616 } 617 if (q->aobs[bufnr]) { 618 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user; 619 phys_aob = virt_to_phys(q->aobs[bufnr]); 620 WARN_ON_ONCE(phys_aob & 0xFF); 621 } 622 623 q->sbal_state[bufnr].flags = 0; 624 return phys_aob; 625 } 626 627 static void qdio_kick_handler(struct qdio_q *q, unsigned int count) 628 { 629 int start = q->first_to_kick; 630 631 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) 632 return; 633 634 if (q->is_input_q) { 635 qperf_inc(q, inbound_handler); 636 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count); 637 } else { 638 qperf_inc(q, outbound_handler); 639 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x", 640 start, count); 641 } 642 643 q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count, 644 q->irq_ptr->int_parm); 645 646 /* for the next time */ 647 q->first_to_kick = add_buf(start, count); 648 q->qdio_error = 0; 649 } 650 651 static inline int qdio_tasklet_schedule(struct qdio_q *q) 652 { 653 if (likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) { 654 tasklet_schedule(&q->tasklet); 655 return 0; 656 } 657 return -EPERM; 658 } 659 660 static void __qdio_inbound_processing(struct qdio_q *q) 661 { 662 unsigned int start = q->first_to_check; 663 int count; 664 665 qperf_inc(q, tasklet_inbound); 666 667 count = qdio_inbound_q_moved(q, start); 668 if (count == 0) 669 return; 670 671 start = add_buf(start, count); 672 q->first_to_check = start; 673 qdio_kick_handler(q, count); 674 675 if (!qdio_inbound_q_done(q, start)) { 676 /* means poll time is not yet over */ 677 qperf_inc(q, tasklet_inbound_resched); 678 if (!qdio_tasklet_schedule(q)) 679 return; 680 } 681 682 qdio_stop_polling(q); 683 /* 684 * We need to check again to not lose initiative after 685 * resetting the ACK state. 686 */ 687 if (!qdio_inbound_q_done(q, start)) { 688 qperf_inc(q, tasklet_inbound_resched2); 689 qdio_tasklet_schedule(q); 690 } 691 } 692 693 void qdio_inbound_processing(unsigned long data) 694 { 695 struct qdio_q *q = (struct qdio_q *)data; 696 __qdio_inbound_processing(q); 697 } 698 699 static int get_outbound_buffer_frontier(struct qdio_q *q, unsigned int start) 700 { 701 unsigned char state = 0; 702 int count; 703 704 q->timestamp = get_tod_clock_fast(); 705 706 if (need_siga_sync(q)) 707 if (((queue_type(q) != QDIO_IQDIO_QFMT) && 708 !pci_out_supported(q->irq_ptr)) || 709 (queue_type(q) == QDIO_IQDIO_QFMT && 710 multicast_outbound(q))) 711 qdio_siga_sync_q(q); 712 713 count = atomic_read(&q->nr_buf_used); 714 if (!count) 715 return 0; 716 717 count = get_buf_states(q, start, &state, count, 0, q->u.out.use_cq); 718 if (!count) 719 return 0; 720 721 switch (state) { 722 case SLSB_P_OUTPUT_EMPTY: 723 case SLSB_P_OUTPUT_PENDING: 724 /* the adapter got it */ 725 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, 726 "out empty:%1d %02x", q->nr, count); 727 728 atomic_sub(count, &q->nr_buf_used); 729 if (q->irq_ptr->perf_stat_enabled) 730 account_sbals(q, count); 731 return count; 732 case SLSB_P_OUTPUT_ERROR: 733 process_buffer_error(q, start, count); 734 atomic_sub(count, &q->nr_buf_used); 735 if (q->irq_ptr->perf_stat_enabled) 736 account_sbals_error(q, count); 737 return count; 738 case SLSB_CU_OUTPUT_PRIMED: 739 /* the adapter has not fetched the output yet */ 740 if (q->irq_ptr->perf_stat_enabled) 741 q->q_stats.nr_sbal_nop++; 742 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", 743 q->nr); 744 return 0; 745 case SLSB_P_OUTPUT_NOT_INIT: 746 case SLSB_P_OUTPUT_HALTED: 747 return 0; 748 default: 749 WARN_ON_ONCE(1); 750 return 0; 751 } 752 } 753 754 /* all buffers processed? */ 755 static inline int qdio_outbound_q_done(struct qdio_q *q) 756 { 757 return atomic_read(&q->nr_buf_used) == 0; 758 } 759 760 static inline int qdio_outbound_q_moved(struct qdio_q *q, unsigned int start) 761 { 762 int count; 763 764 count = get_outbound_buffer_frontier(q, start); 765 766 if (count) { 767 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr); 768 if (q->u.out.use_cq) 769 qdio_handle_aobs(q, start, count); 770 } 771 772 return count; 773 } 774 775 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned int count, 776 unsigned long aob) 777 { 778 int retries = 0, cc; 779 unsigned int busy_bit; 780 781 if (!need_siga_out(q)) 782 return 0; 783 784 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr); 785 retry: 786 qperf_inc(q, siga_write); 787 788 cc = qdio_siga_output(q, count, &busy_bit, aob); 789 switch (cc) { 790 case 0: 791 break; 792 case 2: 793 if (busy_bit) { 794 while (++retries < QDIO_BUSY_BIT_RETRIES) { 795 mdelay(QDIO_BUSY_BIT_RETRY_DELAY); 796 goto retry; 797 } 798 DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr); 799 cc = -EBUSY; 800 } else { 801 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr); 802 cc = -ENOBUFS; 803 } 804 break; 805 case 1: 806 case 3: 807 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc); 808 cc = -EIO; 809 break; 810 } 811 if (retries) { 812 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr); 813 DBF_ERROR("count:%u", retries); 814 } 815 return cc; 816 } 817 818 static void __qdio_outbound_processing(struct qdio_q *q) 819 { 820 unsigned int start = q->first_to_check; 821 int count; 822 823 qperf_inc(q, tasklet_outbound); 824 WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0); 825 826 count = qdio_outbound_q_moved(q, start); 827 if (count) { 828 q->first_to_check = add_buf(start, count); 829 qdio_kick_handler(q, count); 830 } 831 832 if (queue_type(q) == QDIO_ZFCP_QFMT && !pci_out_supported(q->irq_ptr) && 833 !qdio_outbound_q_done(q)) 834 goto sched; 835 836 if (q->u.out.pci_out_enabled) 837 return; 838 839 /* 840 * Now we know that queue type is either qeth without pci enabled 841 * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY 842 * is noticed and outbound_handler is called after some time. 843 */ 844 if (qdio_outbound_q_done(q)) 845 del_timer_sync(&q->u.out.timer); 846 else 847 if (!timer_pending(&q->u.out.timer) && 848 likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) 849 mod_timer(&q->u.out.timer, jiffies + 10 * HZ); 850 return; 851 852 sched: 853 qdio_tasklet_schedule(q); 854 } 855 856 /* outbound tasklet */ 857 void qdio_outbound_processing(unsigned long data) 858 { 859 struct qdio_q *q = (struct qdio_q *)data; 860 __qdio_outbound_processing(q); 861 } 862 863 void qdio_outbound_timer(struct timer_list *t) 864 { 865 struct qdio_q *q = from_timer(q, t, u.out.timer); 866 867 qdio_tasklet_schedule(q); 868 } 869 870 static inline void qdio_check_outbound_pci_queues(struct qdio_irq *irq) 871 { 872 struct qdio_q *out; 873 int i; 874 875 if (!pci_out_supported(irq) || !irq->scan_threshold) 876 return; 877 878 for_each_output_queue(irq, out, i) 879 if (!qdio_outbound_q_done(out)) 880 qdio_tasklet_schedule(out); 881 } 882 883 static void __tiqdio_inbound_processing(struct qdio_q *q) 884 { 885 unsigned int start = q->first_to_check; 886 int count; 887 888 qperf_inc(q, tasklet_inbound); 889 if (need_siga_sync(q) && need_siga_sync_after_ai(q)) 890 qdio_sync_queues(q); 891 892 /* The interrupt could be caused by a PCI request: */ 893 qdio_check_outbound_pci_queues(q->irq_ptr); 894 895 count = qdio_inbound_q_moved(q, start); 896 if (count == 0) 897 return; 898 899 start = add_buf(start, count); 900 q->first_to_check = start; 901 qdio_kick_handler(q, count); 902 903 if (!qdio_inbound_q_done(q, start)) { 904 qperf_inc(q, tasklet_inbound_resched); 905 if (!qdio_tasklet_schedule(q)) 906 return; 907 } 908 909 qdio_stop_polling(q); 910 /* 911 * We need to check again to not lose initiative after 912 * resetting the ACK state. 913 */ 914 if (!qdio_inbound_q_done(q, start)) { 915 qperf_inc(q, tasklet_inbound_resched2); 916 qdio_tasklet_schedule(q); 917 } 918 } 919 920 void tiqdio_inbound_processing(unsigned long data) 921 { 922 struct qdio_q *q = (struct qdio_q *)data; 923 __tiqdio_inbound_processing(q); 924 } 925 926 static inline void qdio_set_state(struct qdio_irq *irq_ptr, 927 enum qdio_irq_states state) 928 { 929 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state); 930 931 irq_ptr->state = state; 932 mb(); 933 } 934 935 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb) 936 { 937 if (irb->esw.esw0.erw.cons) { 938 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no); 939 DBF_ERROR_HEX(irb, 64); 940 DBF_ERROR_HEX(irb->ecw, 64); 941 } 942 } 943 944 /* PCI interrupt handler */ 945 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr) 946 { 947 int i; 948 struct qdio_q *q; 949 950 if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) 951 return; 952 953 for_each_input_queue(irq_ptr, q, i) { 954 if (q->u.in.queue_start_poll) { 955 /* skip if polling is enabled or already in work */ 956 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, 957 &q->u.in.queue_irq_state)) { 958 QDIO_PERF_STAT_INC(irq_ptr, int_discarded); 959 continue; 960 } 961 q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr, 962 q->irq_ptr->int_parm); 963 } else { 964 tasklet_schedule(&q->tasklet); 965 } 966 } 967 968 if (!pci_out_supported(irq_ptr) || !irq_ptr->scan_threshold) 969 return; 970 971 for_each_output_queue(irq_ptr, q, i) { 972 if (qdio_outbound_q_done(q)) 973 continue; 974 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q)) 975 qdio_siga_sync_q(q); 976 qdio_tasklet_schedule(q); 977 } 978 } 979 980 static void qdio_handle_activate_check(struct ccw_device *cdev, 981 unsigned long intparm, int cstat, int dstat) 982 { 983 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 984 struct qdio_q *q; 985 int count; 986 987 DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no); 988 DBF_ERROR("intp :%lx", intparm); 989 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); 990 991 if (irq_ptr->nr_input_qs) { 992 q = irq_ptr->input_qs[0]; 993 } else if (irq_ptr->nr_output_qs) { 994 q = irq_ptr->output_qs[0]; 995 } else { 996 dump_stack(); 997 goto no_handler; 998 } 999 1000 count = sub_buf(q->first_to_check, q->first_to_kick); 1001 q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE, 1002 q->nr, q->first_to_kick, count, irq_ptr->int_parm); 1003 no_handler: 1004 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); 1005 /* 1006 * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen. 1007 * Therefore we call the LGR detection function here. 1008 */ 1009 lgr_info_log(); 1010 } 1011 1012 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat, 1013 int dstat) 1014 { 1015 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1016 1017 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq"); 1018 1019 if (cstat) 1020 goto error; 1021 if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END)) 1022 goto error; 1023 if (!(dstat & DEV_STAT_DEV_END)) 1024 goto error; 1025 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED); 1026 return; 1027 1028 error: 1029 DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no); 1030 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); 1031 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); 1032 } 1033 1034 /* qdio interrupt handler */ 1035 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm, 1036 struct irb *irb) 1037 { 1038 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1039 struct subchannel_id schid; 1040 int cstat, dstat; 1041 1042 if (!intparm || !irq_ptr) { 1043 ccw_device_get_schid(cdev, &schid); 1044 DBF_ERROR("qint:%4x", schid.sch_no); 1045 return; 1046 } 1047 1048 if (irq_ptr->perf_stat_enabled) 1049 irq_ptr->perf_stat.qdio_int++; 1050 1051 if (IS_ERR(irb)) { 1052 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no); 1053 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); 1054 wake_up(&cdev->private->wait_q); 1055 return; 1056 } 1057 qdio_irq_check_sense(irq_ptr, irb); 1058 cstat = irb->scsw.cmd.cstat; 1059 dstat = irb->scsw.cmd.dstat; 1060 1061 switch (irq_ptr->state) { 1062 case QDIO_IRQ_STATE_INACTIVE: 1063 qdio_establish_handle_irq(cdev, cstat, dstat); 1064 break; 1065 case QDIO_IRQ_STATE_CLEANUP: 1066 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); 1067 break; 1068 case QDIO_IRQ_STATE_ESTABLISHED: 1069 case QDIO_IRQ_STATE_ACTIVE: 1070 if (cstat & SCHN_STAT_PCI) { 1071 qdio_int_handler_pci(irq_ptr); 1072 return; 1073 } 1074 if (cstat || dstat) 1075 qdio_handle_activate_check(cdev, intparm, cstat, 1076 dstat); 1077 break; 1078 case QDIO_IRQ_STATE_STOPPED: 1079 break; 1080 default: 1081 WARN_ON_ONCE(1); 1082 } 1083 wake_up(&cdev->private->wait_q); 1084 } 1085 1086 /** 1087 * qdio_get_ssqd_desc - get qdio subchannel description 1088 * @cdev: ccw device to get description for 1089 * @data: where to store the ssqd 1090 * 1091 * Returns 0 or an error code. The results of the chsc are stored in the 1092 * specified structure. 1093 */ 1094 int qdio_get_ssqd_desc(struct ccw_device *cdev, 1095 struct qdio_ssqd_desc *data) 1096 { 1097 struct subchannel_id schid; 1098 1099 if (!cdev || !cdev->private) 1100 return -EINVAL; 1101 1102 ccw_device_get_schid(cdev, &schid); 1103 DBF_EVENT("get ssqd:%4x", schid.sch_no); 1104 return qdio_setup_get_ssqd(NULL, &schid, data); 1105 } 1106 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc); 1107 1108 static void qdio_shutdown_queues(struct ccw_device *cdev) 1109 { 1110 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1111 struct qdio_q *q; 1112 int i; 1113 1114 for_each_input_queue(irq_ptr, q, i) 1115 tasklet_kill(&q->tasklet); 1116 1117 for_each_output_queue(irq_ptr, q, i) { 1118 del_timer_sync(&q->u.out.timer); 1119 tasklet_kill(&q->tasklet); 1120 } 1121 } 1122 1123 /** 1124 * qdio_shutdown - shut down a qdio subchannel 1125 * @cdev: associated ccw device 1126 * @how: use halt or clear to shutdown 1127 */ 1128 int qdio_shutdown(struct ccw_device *cdev, int how) 1129 { 1130 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1131 struct subchannel_id schid; 1132 int rc; 1133 1134 if (!irq_ptr) 1135 return -ENODEV; 1136 1137 WARN_ON_ONCE(irqs_disabled()); 1138 ccw_device_get_schid(cdev, &schid); 1139 DBF_EVENT("qshutdown:%4x", schid.sch_no); 1140 1141 mutex_lock(&irq_ptr->setup_mutex); 1142 /* 1143 * Subchannel was already shot down. We cannot prevent being called 1144 * twice since cio may trigger a shutdown asynchronously. 1145 */ 1146 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { 1147 mutex_unlock(&irq_ptr->setup_mutex); 1148 return 0; 1149 } 1150 1151 /* 1152 * Indicate that the device is going down. Scheduling the queue 1153 * tasklets is forbidden from here on. 1154 */ 1155 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); 1156 1157 tiqdio_remove_device(irq_ptr); 1158 qdio_shutdown_queues(cdev); 1159 qdio_shutdown_debug_entries(irq_ptr); 1160 1161 /* cleanup subchannel */ 1162 spin_lock_irq(get_ccwdev_lock(cdev)); 1163 1164 if (how & QDIO_FLAG_CLEANUP_USING_CLEAR) 1165 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP); 1166 else 1167 /* default behaviour is halt */ 1168 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP); 1169 if (rc) { 1170 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no); 1171 DBF_ERROR("rc:%4d", rc); 1172 goto no_cleanup; 1173 } 1174 1175 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP); 1176 spin_unlock_irq(get_ccwdev_lock(cdev)); 1177 wait_event_interruptible_timeout(cdev->private->wait_q, 1178 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE || 1179 irq_ptr->state == QDIO_IRQ_STATE_ERR, 1180 10 * HZ); 1181 spin_lock_irq(get_ccwdev_lock(cdev)); 1182 1183 no_cleanup: 1184 qdio_shutdown_thinint(irq_ptr); 1185 1186 /* restore interrupt handler */ 1187 if ((void *)cdev->handler == (void *)qdio_int_handler) { 1188 cdev->handler = irq_ptr->orig_handler; 1189 cdev->private->intparm = 0; 1190 } 1191 spin_unlock_irq(get_ccwdev_lock(cdev)); 1192 1193 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); 1194 mutex_unlock(&irq_ptr->setup_mutex); 1195 if (rc) 1196 return rc; 1197 return 0; 1198 } 1199 EXPORT_SYMBOL_GPL(qdio_shutdown); 1200 1201 /** 1202 * qdio_free - free data structures for a qdio subchannel 1203 * @cdev: associated ccw device 1204 */ 1205 int qdio_free(struct ccw_device *cdev) 1206 { 1207 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1208 struct subchannel_id schid; 1209 1210 if (!irq_ptr) 1211 return -ENODEV; 1212 1213 ccw_device_get_schid(cdev, &schid); 1214 DBF_EVENT("qfree:%4x", schid.sch_no); 1215 DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned"); 1216 mutex_lock(&irq_ptr->setup_mutex); 1217 1218 irq_ptr->debug_area = NULL; 1219 cdev->private->qdio_data = NULL; 1220 mutex_unlock(&irq_ptr->setup_mutex); 1221 1222 qdio_release_memory(irq_ptr); 1223 return 0; 1224 } 1225 EXPORT_SYMBOL_GPL(qdio_free); 1226 1227 /** 1228 * qdio_allocate - allocate qdio queues and associated data 1229 * @init_data: initialization data 1230 */ 1231 int qdio_allocate(struct qdio_initialize *init_data) 1232 { 1233 struct subchannel_id schid; 1234 struct qdio_irq *irq_ptr; 1235 1236 ccw_device_get_schid(init_data->cdev, &schid); 1237 DBF_EVENT("qallocate:%4x", schid.sch_no); 1238 1239 if ((init_data->no_input_qs && !init_data->input_handler) || 1240 (init_data->no_output_qs && !init_data->output_handler)) 1241 return -EINVAL; 1242 1243 if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) || 1244 (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)) 1245 return -EINVAL; 1246 1247 if ((!init_data->input_sbal_addr_array) || 1248 (!init_data->output_sbal_addr_array)) 1249 return -EINVAL; 1250 1251 /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */ 1252 irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 1253 if (!irq_ptr) 1254 goto out_err; 1255 1256 mutex_init(&irq_ptr->setup_mutex); 1257 if (qdio_allocate_dbf(init_data, irq_ptr)) 1258 goto out_rel; 1259 1260 /* 1261 * Allocate a page for the chsc calls in qdio_establish. 1262 * Must be pre-allocated since a zfcp recovery will call 1263 * qdio_establish. In case of low memory and swap on a zfcp disk 1264 * we may not be able to allocate memory otherwise. 1265 */ 1266 irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL); 1267 if (!irq_ptr->chsc_page) 1268 goto out_rel; 1269 1270 /* qdr is used in ccw1.cda which is u32 */ 1271 irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 1272 if (!irq_ptr->qdr) 1273 goto out_rel; 1274 1275 if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs, 1276 init_data->no_output_qs)) 1277 goto out_rel; 1278 1279 INIT_LIST_HEAD(&irq_ptr->entry); 1280 init_data->cdev->private->qdio_data = irq_ptr; 1281 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); 1282 return 0; 1283 out_rel: 1284 qdio_release_memory(irq_ptr); 1285 out_err: 1286 return -ENOMEM; 1287 } 1288 EXPORT_SYMBOL_GPL(qdio_allocate); 1289 1290 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr) 1291 { 1292 struct qdio_q *q = irq_ptr->input_qs[0]; 1293 int i, use_cq = 0; 1294 1295 if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT) 1296 use_cq = 1; 1297 1298 for_each_output_queue(irq_ptr, q, i) { 1299 if (use_cq) { 1300 if (multicast_outbound(q)) 1301 continue; 1302 if (qdio_enable_async_operation(&q->u.out) < 0) { 1303 use_cq = 0; 1304 continue; 1305 } 1306 } else 1307 qdio_disable_async_operation(&q->u.out); 1308 } 1309 DBF_EVENT("use_cq:%d", use_cq); 1310 } 1311 1312 /** 1313 * qdio_establish - establish queues on a qdio subchannel 1314 * @init_data: initialization data 1315 */ 1316 int qdio_establish(struct qdio_initialize *init_data) 1317 { 1318 struct ccw_device *cdev = init_data->cdev; 1319 struct subchannel_id schid; 1320 struct qdio_irq *irq_ptr; 1321 int rc; 1322 1323 ccw_device_get_schid(cdev, &schid); 1324 DBF_EVENT("qestablish:%4x", schid.sch_no); 1325 1326 irq_ptr = cdev->private->qdio_data; 1327 if (!irq_ptr) 1328 return -ENODEV; 1329 1330 mutex_lock(&irq_ptr->setup_mutex); 1331 qdio_setup_irq(init_data); 1332 1333 rc = qdio_establish_thinint(irq_ptr); 1334 if (rc) { 1335 mutex_unlock(&irq_ptr->setup_mutex); 1336 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); 1337 return rc; 1338 } 1339 1340 /* establish q */ 1341 irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd; 1342 irq_ptr->ccw.flags = CCW_FLAG_SLI; 1343 irq_ptr->ccw.count = irq_ptr->equeue.count; 1344 irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr); 1345 1346 spin_lock_irq(get_ccwdev_lock(cdev)); 1347 ccw_device_set_options_mask(cdev, 0); 1348 1349 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0); 1350 spin_unlock_irq(get_ccwdev_lock(cdev)); 1351 if (rc) { 1352 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no); 1353 DBF_ERROR("rc:%4x", rc); 1354 mutex_unlock(&irq_ptr->setup_mutex); 1355 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); 1356 return rc; 1357 } 1358 1359 wait_event_interruptible_timeout(cdev->private->wait_q, 1360 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED || 1361 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ); 1362 1363 if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) { 1364 mutex_unlock(&irq_ptr->setup_mutex); 1365 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); 1366 return -EIO; 1367 } 1368 1369 qdio_setup_ssqd_info(irq_ptr); 1370 1371 qdio_detect_hsicq(irq_ptr); 1372 1373 /* qebsm is now setup if available, initialize buffer states */ 1374 qdio_init_buf_states(irq_ptr); 1375 1376 mutex_unlock(&irq_ptr->setup_mutex); 1377 qdio_print_subchannel_info(irq_ptr, cdev); 1378 qdio_setup_debug_entries(irq_ptr, cdev); 1379 return 0; 1380 } 1381 EXPORT_SYMBOL_GPL(qdio_establish); 1382 1383 /** 1384 * qdio_activate - activate queues on a qdio subchannel 1385 * @cdev: associated cdev 1386 */ 1387 int qdio_activate(struct ccw_device *cdev) 1388 { 1389 struct subchannel_id schid; 1390 struct qdio_irq *irq_ptr; 1391 int rc; 1392 1393 ccw_device_get_schid(cdev, &schid); 1394 DBF_EVENT("qactivate:%4x", schid.sch_no); 1395 1396 irq_ptr = cdev->private->qdio_data; 1397 if (!irq_ptr) 1398 return -ENODEV; 1399 1400 mutex_lock(&irq_ptr->setup_mutex); 1401 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { 1402 rc = -EBUSY; 1403 goto out; 1404 } 1405 1406 irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd; 1407 irq_ptr->ccw.flags = CCW_FLAG_SLI; 1408 irq_ptr->ccw.count = irq_ptr->aqueue.count; 1409 irq_ptr->ccw.cda = 0; 1410 1411 spin_lock_irq(get_ccwdev_lock(cdev)); 1412 ccw_device_set_options(cdev, CCWDEV_REPORT_ALL); 1413 1414 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE, 1415 0, DOIO_DENY_PREFETCH); 1416 spin_unlock_irq(get_ccwdev_lock(cdev)); 1417 if (rc) { 1418 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no); 1419 DBF_ERROR("rc:%4x", rc); 1420 goto out; 1421 } 1422 1423 if (is_thinint_irq(irq_ptr)) 1424 tiqdio_add_device(irq_ptr); 1425 1426 /* wait for subchannel to become active */ 1427 msleep(5); 1428 1429 switch (irq_ptr->state) { 1430 case QDIO_IRQ_STATE_STOPPED: 1431 case QDIO_IRQ_STATE_ERR: 1432 rc = -EIO; 1433 break; 1434 default: 1435 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE); 1436 rc = 0; 1437 } 1438 out: 1439 mutex_unlock(&irq_ptr->setup_mutex); 1440 return rc; 1441 } 1442 EXPORT_SYMBOL_GPL(qdio_activate); 1443 1444 static inline int buf_in_between(int bufnr, int start, int count) 1445 { 1446 int end = add_buf(start, count); 1447 1448 if (end > start) { 1449 if (bufnr >= start && bufnr < end) 1450 return 1; 1451 else 1452 return 0; 1453 } 1454 1455 /* wrap-around case */ 1456 if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) || 1457 (bufnr < end)) 1458 return 1; 1459 else 1460 return 0; 1461 } 1462 1463 /** 1464 * handle_inbound - reset processed input buffers 1465 * @q: queue containing the buffers 1466 * @callflags: flags 1467 * @bufnr: first buffer to process 1468 * @count: how many buffers are emptied 1469 */ 1470 static int handle_inbound(struct qdio_q *q, unsigned int callflags, 1471 int bufnr, int count) 1472 { 1473 int diff; 1474 1475 qperf_inc(q, inbound_call); 1476 1477 if (!q->u.in.ack_count) 1478 goto set; 1479 1480 /* protect against stop polling setting an ACK for an emptied slsb */ 1481 if (count == QDIO_MAX_BUFFERS_PER_Q) { 1482 /* overwriting everything, just delete polling status */ 1483 q->u.in.ack_count = 0; 1484 goto set; 1485 } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) { 1486 if (is_qebsm(q)) { 1487 /* partial overwrite, just update ack_start */ 1488 diff = add_buf(bufnr, count); 1489 diff = sub_buf(diff, q->u.in.ack_start); 1490 q->u.in.ack_count -= diff; 1491 if (q->u.in.ack_count <= 0) { 1492 q->u.in.ack_count = 0; 1493 goto set; 1494 } 1495 q->u.in.ack_start = add_buf(q->u.in.ack_start, diff); 1496 } else { 1497 /* the only ACK will be deleted */ 1498 q->u.in.ack_count = 0; 1499 } 1500 } 1501 1502 set: 1503 count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count); 1504 atomic_add(count, &q->nr_buf_used); 1505 1506 if (need_siga_in(q)) 1507 return qdio_siga_input(q); 1508 1509 return 0; 1510 } 1511 1512 /** 1513 * handle_outbound - process filled outbound buffers 1514 * @q: queue containing the buffers 1515 * @callflags: flags 1516 * @bufnr: first buffer to process 1517 * @count: how many buffers are filled 1518 */ 1519 static int handle_outbound(struct qdio_q *q, unsigned int callflags, 1520 unsigned int bufnr, unsigned int count) 1521 { 1522 const unsigned int scan_threshold = q->irq_ptr->scan_threshold; 1523 unsigned char state = 0; 1524 int used, rc = 0; 1525 1526 qperf_inc(q, outbound_call); 1527 1528 count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count); 1529 used = atomic_add_return(count, &q->nr_buf_used); 1530 1531 if (used == QDIO_MAX_BUFFERS_PER_Q) 1532 qperf_inc(q, outbound_queue_full); 1533 1534 if (callflags & QDIO_FLAG_PCI_OUT) { 1535 q->u.out.pci_out_enabled = 1; 1536 qperf_inc(q, pci_request_int); 1537 } else 1538 q->u.out.pci_out_enabled = 0; 1539 1540 if (queue_type(q) == QDIO_IQDIO_QFMT) { 1541 unsigned long phys_aob = 0; 1542 1543 if (q->u.out.use_cq && count == 1) 1544 phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr); 1545 1546 rc = qdio_kick_outbound_q(q, count, phys_aob); 1547 } else if (need_siga_sync(q)) { 1548 rc = qdio_siga_sync_q(q); 1549 } else if (count < QDIO_MAX_BUFFERS_PER_Q && 1550 get_buf_state(q, prev_buf(bufnr), &state, 0) > 0 && 1551 state == SLSB_CU_OUTPUT_PRIMED) { 1552 /* The previous buffer is not processed yet, tack on. */ 1553 qperf_inc(q, fast_requeue); 1554 } else { 1555 rc = qdio_kick_outbound_q(q, count, 0); 1556 } 1557 1558 /* Let drivers implement their own completion scanning: */ 1559 if (!scan_threshold) 1560 return rc; 1561 1562 /* in case of SIGA errors we must process the error immediately */ 1563 if (used >= scan_threshold || rc) 1564 qdio_tasklet_schedule(q); 1565 else 1566 /* free the SBALs in case of no further traffic */ 1567 if (!timer_pending(&q->u.out.timer) && 1568 likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) 1569 mod_timer(&q->u.out.timer, jiffies + HZ); 1570 return rc; 1571 } 1572 1573 /** 1574 * do_QDIO - process input or output buffers 1575 * @cdev: associated ccw_device for the qdio subchannel 1576 * @callflags: input or output and special flags from the program 1577 * @q_nr: queue number 1578 * @bufnr: buffer number 1579 * @count: how many buffers to process 1580 */ 1581 int do_QDIO(struct ccw_device *cdev, unsigned int callflags, 1582 int q_nr, unsigned int bufnr, unsigned int count) 1583 { 1584 struct qdio_irq *irq_ptr; 1585 1586 if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q) 1587 return -EINVAL; 1588 1589 irq_ptr = cdev->private->qdio_data; 1590 if (!irq_ptr) 1591 return -ENODEV; 1592 1593 DBF_DEV_EVENT(DBF_INFO, irq_ptr, 1594 "do%02x b:%02x c:%02x", callflags, bufnr, count); 1595 1596 if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE) 1597 return -EIO; 1598 if (!count) 1599 return 0; 1600 if (callflags & QDIO_FLAG_SYNC_INPUT) 1601 return handle_inbound(irq_ptr->input_qs[q_nr], 1602 callflags, bufnr, count); 1603 else if (callflags & QDIO_FLAG_SYNC_OUTPUT) 1604 return handle_outbound(irq_ptr->output_qs[q_nr], 1605 callflags, bufnr, count); 1606 return -EINVAL; 1607 } 1608 EXPORT_SYMBOL_GPL(do_QDIO); 1609 1610 /** 1611 * qdio_start_irq - process input buffers 1612 * @cdev: associated ccw_device for the qdio subchannel 1613 * @nr: input queue number 1614 * 1615 * Return codes 1616 * 0 - success 1617 * 1 - irqs not started since new data is available 1618 */ 1619 int qdio_start_irq(struct ccw_device *cdev, int nr) 1620 { 1621 struct qdio_q *q; 1622 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1623 1624 if (!irq_ptr) 1625 return -ENODEV; 1626 q = irq_ptr->input_qs[nr]; 1627 1628 clear_nonshared_ind(irq_ptr); 1629 qdio_stop_polling(q); 1630 clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state); 1631 1632 /* 1633 * We need to check again to not lose initiative after 1634 * resetting the ACK state. 1635 */ 1636 if (test_nonshared_ind(irq_ptr)) 1637 goto rescan; 1638 if (!qdio_inbound_q_done(q, q->first_to_check)) 1639 goto rescan; 1640 return 0; 1641 1642 rescan: 1643 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, 1644 &q->u.in.queue_irq_state)) 1645 return 0; 1646 else 1647 return 1; 1648 1649 } 1650 EXPORT_SYMBOL(qdio_start_irq); 1651 1652 static int __qdio_inspect_queue(struct qdio_q *q, unsigned int *bufnr, 1653 unsigned int *error) 1654 { 1655 unsigned int start = q->first_to_check; 1656 int count; 1657 1658 count = q->is_input_q ? qdio_inbound_q_moved(q, start) : 1659 qdio_outbound_q_moved(q, start); 1660 if (count == 0) 1661 return 0; 1662 1663 *bufnr = start; 1664 *error = q->qdio_error; 1665 1666 /* for the next time */ 1667 q->first_to_check = add_buf(start, count); 1668 q->qdio_error = 0; 1669 1670 return count; 1671 } 1672 1673 int qdio_inspect_queue(struct ccw_device *cdev, unsigned int nr, bool is_input, 1674 unsigned int *bufnr, unsigned int *error) 1675 { 1676 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1677 struct qdio_q *q; 1678 1679 if (!irq_ptr) 1680 return -ENODEV; 1681 q = is_input ? irq_ptr->input_qs[nr] : irq_ptr->output_qs[nr]; 1682 1683 if (need_siga_sync(q)) 1684 qdio_siga_sync_q(q); 1685 1686 return __qdio_inspect_queue(q, bufnr, error); 1687 } 1688 EXPORT_SYMBOL_GPL(qdio_inspect_queue); 1689 1690 /** 1691 * qdio_get_next_buffers - process input buffers 1692 * @cdev: associated ccw_device for the qdio subchannel 1693 * @nr: input queue number 1694 * @bufnr: first filled buffer number 1695 * @error: buffers are in error state 1696 * 1697 * Return codes 1698 * < 0 - error 1699 * = 0 - no new buffers found 1700 * > 0 - number of processed buffers 1701 */ 1702 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr, 1703 int *error) 1704 { 1705 struct qdio_q *q; 1706 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1707 1708 if (!irq_ptr) 1709 return -ENODEV; 1710 q = irq_ptr->input_qs[nr]; 1711 1712 /* 1713 * Cannot rely on automatic sync after interrupt since queues may 1714 * also be examined without interrupt. 1715 */ 1716 if (need_siga_sync(q)) 1717 qdio_sync_queues(q); 1718 1719 qdio_check_outbound_pci_queues(irq_ptr); 1720 1721 /* Note: upper-layer MUST stop processing immediately here ... */ 1722 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) 1723 return -EIO; 1724 1725 return __qdio_inspect_queue(q, bufnr, error); 1726 } 1727 EXPORT_SYMBOL(qdio_get_next_buffers); 1728 1729 /** 1730 * qdio_stop_irq - disable interrupt processing for the device 1731 * @cdev: associated ccw_device for the qdio subchannel 1732 * @nr: input queue number 1733 * 1734 * Return codes 1735 * 0 - interrupts were already disabled 1736 * 1 - interrupts successfully disabled 1737 */ 1738 int qdio_stop_irq(struct ccw_device *cdev, int nr) 1739 { 1740 struct qdio_q *q; 1741 struct qdio_irq *irq_ptr = cdev->private->qdio_data; 1742 1743 if (!irq_ptr) 1744 return -ENODEV; 1745 q = irq_ptr->input_qs[nr]; 1746 1747 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, 1748 &q->u.in.queue_irq_state)) 1749 return 0; 1750 else 1751 return 1; 1752 } 1753 EXPORT_SYMBOL(qdio_stop_irq); 1754 1755 /** 1756 * qdio_pnso_brinfo() - perform network subchannel op #0 - bridge info. 1757 * @schid: Subchannel ID. 1758 * @cnc: Boolean Change-Notification Control 1759 * @response: Response code will be stored at this address 1760 * @cb: Callback function will be executed for each element 1761 * of the address list 1762 * @priv: Pointer to pass to the callback function. 1763 * 1764 * Performs "Store-network-bridging-information list" operation and calls 1765 * the callback function for every entry in the list. If "change- 1766 * notification-control" is set, further changes in the address list 1767 * will be reported via the IPA command. 1768 */ 1769 int qdio_pnso_brinfo(struct subchannel_id schid, 1770 int cnc, u16 *response, 1771 void (*cb)(void *priv, enum qdio_brinfo_entry_type type, 1772 void *entry), 1773 void *priv) 1774 { 1775 struct chsc_pnso_area *rr; 1776 int rc; 1777 u32 prev_instance = 0; 1778 int isfirstblock = 1; 1779 int i, size, elems; 1780 1781 rr = (struct chsc_pnso_area *)get_zeroed_page(GFP_KERNEL); 1782 if (rr == NULL) 1783 return -ENOMEM; 1784 do { 1785 /* on the first iteration, naihdr.resume_token will be zero */ 1786 rc = chsc_pnso_brinfo(schid, rr, rr->naihdr.resume_token, cnc); 1787 if (rc != 0 && rc != -EBUSY) 1788 goto out; 1789 if (rr->response.code != 1) { 1790 rc = -EIO; 1791 continue; 1792 } else 1793 rc = 0; 1794 1795 if (cb == NULL) 1796 continue; 1797 1798 size = rr->naihdr.naids; 1799 elems = (rr->response.length - 1800 sizeof(struct chsc_header) - 1801 sizeof(struct chsc_brinfo_naihdr)) / 1802 size; 1803 1804 if (!isfirstblock && (rr->naihdr.instance != prev_instance)) { 1805 /* Inform the caller that they need to scrap */ 1806 /* the data that was already reported via cb */ 1807 rc = -EAGAIN; 1808 break; 1809 } 1810 isfirstblock = 0; 1811 prev_instance = rr->naihdr.instance; 1812 for (i = 0; i < elems; i++) 1813 switch (size) { 1814 case sizeof(struct qdio_brinfo_entry_l3_ipv6): 1815 (*cb)(priv, l3_ipv6_addr, 1816 &rr->entries.l3_ipv6[i]); 1817 break; 1818 case sizeof(struct qdio_brinfo_entry_l3_ipv4): 1819 (*cb)(priv, l3_ipv4_addr, 1820 &rr->entries.l3_ipv4[i]); 1821 break; 1822 case sizeof(struct qdio_brinfo_entry_l2): 1823 (*cb)(priv, l2_addr_lnid, 1824 &rr->entries.l2[i]); 1825 break; 1826 default: 1827 WARN_ON_ONCE(1); 1828 rc = -EIO; 1829 goto out; 1830 } 1831 } while (rr->response.code == 0x0107 || /* channel busy */ 1832 (rr->response.code == 1 && /* list stored */ 1833 /* resume token is non-zero => list incomplete */ 1834 (rr->naihdr.resume_token.t1 || rr->naihdr.resume_token.t2))); 1835 (*response) = rr->response.code; 1836 1837 out: 1838 free_page((unsigned long)rr); 1839 return rc; 1840 } 1841 EXPORT_SYMBOL_GPL(qdio_pnso_brinfo); 1842 1843 static int __init init_QDIO(void) 1844 { 1845 int rc; 1846 1847 rc = qdio_debug_init(); 1848 if (rc) 1849 return rc; 1850 rc = qdio_setup_init(); 1851 if (rc) 1852 goto out_debug; 1853 rc = tiqdio_allocate_memory(); 1854 if (rc) 1855 goto out_cache; 1856 rc = tiqdio_register_thinints(); 1857 if (rc) 1858 goto out_ti; 1859 return 0; 1860 1861 out_ti: 1862 tiqdio_free_memory(); 1863 out_cache: 1864 qdio_setup_exit(); 1865 out_debug: 1866 qdio_debug_exit(); 1867 return rc; 1868 } 1869 1870 static void __exit exit_QDIO(void) 1871 { 1872 tiqdio_unregister_thinints(); 1873 tiqdio_free_memory(); 1874 qdio_setup_exit(); 1875 qdio_debug_exit(); 1876 } 1877 1878 module_init(init_QDIO); 1879 module_exit(exit_QDIO); 1880