1/* 2 * This file is part of the zfcp device driver for 3 * FCP adapters for IBM System z9 and zSeries. 4 * 5 * (C) Copyright IBM Corp. 2002, 2006 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2, or (at your option) 10 * any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 */ 21 22#include "zfcp_ext.h" 23 24static void zfcp_qdio_sbal_limit(struct zfcp_fsf_req *, int); 25static inline volatile struct qdio_buffer_element *zfcp_qdio_sbale_get 26 (struct zfcp_qdio_queue *, int, int); 27static inline volatile struct qdio_buffer_element *zfcp_qdio_sbale_resp 28 (struct zfcp_fsf_req *, int, int); 29static volatile struct qdio_buffer_element *zfcp_qdio_sbal_chain 30 (struct zfcp_fsf_req *, unsigned long); 31static volatile struct qdio_buffer_element *zfcp_qdio_sbale_next 32 (struct zfcp_fsf_req *, unsigned long); 33static int zfcp_qdio_sbals_zero(struct zfcp_qdio_queue *, int, int); 34static inline int zfcp_qdio_sbals_wipe(struct zfcp_fsf_req *); 35static void zfcp_qdio_sbale_fill 36 (struct zfcp_fsf_req *, unsigned long, void *, int); 37static int zfcp_qdio_sbals_from_segment 38 (struct zfcp_fsf_req *, unsigned long, void *, unsigned long); 39static int zfcp_qdio_sbals_from_buffer 40 (struct zfcp_fsf_req *, unsigned long, void *, unsigned long, int); 41 42static qdio_handler_t zfcp_qdio_request_handler; 43static qdio_handler_t zfcp_qdio_response_handler; 44static int zfcp_qdio_handler_error_check(struct zfcp_adapter *, 45 unsigned int, unsigned int, unsigned int, int, int); 46 47#define ZFCP_LOG_AREA ZFCP_LOG_AREA_QDIO 48 49/* 50 * Allocates BUFFER memory to each of the pointers of the qdio_buffer_t 51 * array in the adapter struct. 52 * Cur_buf is the pointer array and count can be any number of required 53 * buffers, the page-fitting arithmetic is done entirely within this funciton. 54 * 55 * returns: number of buffers allocated 56 * locks: must only be called with zfcp_data.config_sema taken 57 */ 58static int 59zfcp_qdio_buffers_enqueue(struct qdio_buffer **cur_buf, int count) 60{ 61 int buf_pos; 62 int qdio_buffers_per_page; 63 int page_pos = 0; 64 struct qdio_buffer *first_in_page = NULL; 65 66 qdio_buffers_per_page = PAGE_SIZE / sizeof (struct qdio_buffer); 67 ZFCP_LOG_TRACE("buffers_per_page=%d\n", qdio_buffers_per_page); 68 69 for (buf_pos = 0; buf_pos < count; buf_pos++) { 70 if (page_pos == 0) { 71 cur_buf[buf_pos] = (struct qdio_buffer *) 72 get_zeroed_page(GFP_KERNEL); 73 if (cur_buf[buf_pos] == NULL) { 74 ZFCP_LOG_INFO("error: allocation of " 75 "QDIO buffer failed \n"); 76 goto out; 77 } 78 first_in_page = cur_buf[buf_pos]; 79 } else { 80 cur_buf[buf_pos] = first_in_page + page_pos; 81 82 } 83 /* was initialised to zero */ 84 page_pos++; 85 page_pos %= qdio_buffers_per_page; 86 } 87 out: 88 return buf_pos; 89} 90 91/* 92 * Frees BUFFER memory for each of the pointers of the struct qdio_buffer array 93 * in the adapter struct cur_buf is the pointer array and count can be any 94 * number of buffers in the array that should be freed starting from buffer 0 95 * 96 * locks: must only be called with zfcp_data.config_sema taken 97 */ 98static void 99zfcp_qdio_buffers_dequeue(struct qdio_buffer **cur_buf, int count) 100{ 101 int buf_pos; 102 int qdio_buffers_per_page; 103 104 qdio_buffers_per_page = PAGE_SIZE / sizeof (struct qdio_buffer); 105 ZFCP_LOG_TRACE("buffers_per_page=%d\n", qdio_buffers_per_page); 106 107 for (buf_pos = 0; buf_pos < count; buf_pos += qdio_buffers_per_page) 108 free_page((unsigned long) cur_buf[buf_pos]); 109 return; 110} 111 112/* locks: must only be called with zfcp_data.config_sema taken */ 113int 114zfcp_qdio_allocate_queues(struct zfcp_adapter *adapter) 115{ 116 int buffer_count; 117 int retval = 0; 118 119 buffer_count = 120 zfcp_qdio_buffers_enqueue(&(adapter->request_queue.buffer[0]), 121 QDIO_MAX_BUFFERS_PER_Q); 122 if (buffer_count < QDIO_MAX_BUFFERS_PER_Q) { 123 ZFCP_LOG_DEBUG("only %d QDIO buffers allocated for request " 124 "queue\n", buffer_count); 125 zfcp_qdio_buffers_dequeue(&(adapter->request_queue.buffer[0]), 126 buffer_count); 127 retval = -ENOMEM; 128 goto out; 129 } 130 131 buffer_count = 132 zfcp_qdio_buffers_enqueue(&(adapter->response_queue.buffer[0]), 133 QDIO_MAX_BUFFERS_PER_Q); 134 if (buffer_count < QDIO_MAX_BUFFERS_PER_Q) { 135 ZFCP_LOG_DEBUG("only %d QDIO buffers allocated for response " 136 "queue", buffer_count); 137 zfcp_qdio_buffers_dequeue(&(adapter->response_queue.buffer[0]), 138 buffer_count); 139 ZFCP_LOG_TRACE("freeing request_queue buffers\n"); 140 zfcp_qdio_buffers_dequeue(&(adapter->request_queue.buffer[0]), 141 QDIO_MAX_BUFFERS_PER_Q); 142 retval = -ENOMEM; 143 goto out; 144 } 145 out: 146 return retval; 147} 148 149/* locks: must only be called with zfcp_data.config_sema taken */ 150void 151zfcp_qdio_free_queues(struct zfcp_adapter *adapter) 152{ 153 ZFCP_LOG_TRACE("freeing request_queue buffers\n"); 154 zfcp_qdio_buffers_dequeue(&(adapter->request_queue.buffer[0]), 155 QDIO_MAX_BUFFERS_PER_Q); 156 157 ZFCP_LOG_TRACE("freeing response_queue buffers\n"); 158 zfcp_qdio_buffers_dequeue(&(adapter->response_queue.buffer[0]), 159 QDIO_MAX_BUFFERS_PER_Q); 160} 161 162int 163zfcp_qdio_allocate(struct zfcp_adapter *adapter) 164{ 165 struct qdio_initialize *init_data; 166 167 init_data = &adapter->qdio_init_data; 168 169 init_data->cdev = adapter->ccw_device; 170 init_data->q_format = QDIO_SCSI_QFMT; 171 memcpy(init_data->adapter_name, zfcp_get_busid_by_adapter(adapter), 8); 172 ASCEBC(init_data->adapter_name, 8); 173 init_data->qib_param_field_format = 0; 174 init_data->qib_param_field = NULL; 175 init_data->input_slib_elements = NULL; 176 init_data->output_slib_elements = NULL; 177 init_data->min_input_threshold = ZFCP_MIN_INPUT_THRESHOLD; 178 init_data->max_input_threshold = ZFCP_MAX_INPUT_THRESHOLD; 179 init_data->min_output_threshold = ZFCP_MIN_OUTPUT_THRESHOLD; 180 init_data->max_output_threshold = ZFCP_MAX_OUTPUT_THRESHOLD; 181 init_data->no_input_qs = 1; 182 init_data->no_output_qs = 1; 183 init_data->input_handler = zfcp_qdio_response_handler; 184 init_data->output_handler = zfcp_qdio_request_handler; 185 init_data->int_parm = (unsigned long) adapter; 186 init_data->flags = QDIO_INBOUND_0COPY_SBALS | 187 QDIO_OUTBOUND_0COPY_SBALS | QDIO_USE_OUTBOUND_PCIS; 188 init_data->input_sbal_addr_array = 189 (void **) (adapter->response_queue.buffer); 190 init_data->output_sbal_addr_array = 191 (void **) (adapter->request_queue.buffer); 192 193 return qdio_allocate(init_data); 194} 195 196/* 197 * function: zfcp_qdio_handler_error_check 198 * 199 * purpose: called by the response handler to determine error condition 200 * 201 * returns: error flag 202 * 203 */ 204static int 205zfcp_qdio_handler_error_check(struct zfcp_adapter *adapter, unsigned int status, 206 unsigned int qdio_error, unsigned int siga_error, 207 int first_element, int elements_processed) 208{ 209 int retval = 0; 210 211 if (unlikely(status & QDIO_STATUS_LOOK_FOR_ERROR)) { 212 retval = -EIO; 213 214 ZFCP_LOG_INFO("QDIO problem occurred (status=0x%x, " 215 "qdio_error=0x%x, siga_error=0x%x)\n", 216 status, qdio_error, siga_error); 217 218 zfcp_hba_dbf_event_qdio(adapter, status, qdio_error, siga_error, 219 first_element, elements_processed); 220 /* 221 * Restarting IO on the failed adapter from scratch. 222 * Since we have been using this adapter, it is save to assume 223 * that it is not failed but recoverable. The card seems to 224 * report link-up events by self-initiated queue shutdown. 225 * That is why we need to clear the link-down flag 226 * which is set again in case we have missed by a mile. 227 */ 228 zfcp_erp_adapter_reopen( 229 adapter, 230 ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED | 231 ZFCP_STATUS_COMMON_ERP_FAILED); 232 } 233 return retval; 234} 235 236/* 237 * function: zfcp_qdio_request_handler 238 * 239 * purpose: is called by QDIO layer for completed SBALs in request queue 240 * 241 * returns: (void) 242 */ 243static void 244zfcp_qdio_request_handler(struct ccw_device *ccw_device, 245 unsigned int status, 246 unsigned int qdio_error, 247 unsigned int siga_error, 248 unsigned int queue_number, 249 int first_element, 250 int elements_processed, 251 unsigned long int_parm) 252{ 253 struct zfcp_adapter *adapter; 254 struct zfcp_qdio_queue *queue; 255 256 adapter = (struct zfcp_adapter *) int_parm; 257 queue = &adapter->request_queue; 258 259 ZFCP_LOG_DEBUG("adapter %s, first=%d, elements_processed=%d\n", 260 zfcp_get_busid_by_adapter(adapter), 261 first_element, elements_processed); 262 263 if (unlikely(zfcp_qdio_handler_error_check(adapter, status, qdio_error, 264 siga_error, first_element, 265 elements_processed))) 266 goto out; 267 /* 268 * we stored address of struct zfcp_adapter data structure 269 * associated with irq in int_parm 270 */ 271 272 /* cleanup all SBALs being program-owned now */ 273 zfcp_qdio_zero_sbals(queue->buffer, first_element, elements_processed); 274 275 /* increase free space in outbound queue */ 276 atomic_add(elements_processed, &queue->free_count); 277 ZFCP_LOG_DEBUG("free_count=%d\n", atomic_read(&queue->free_count)); 278 wake_up(&adapter->request_wq); 279 ZFCP_LOG_DEBUG("elements_processed=%d, free count=%d\n", 280 elements_processed, atomic_read(&queue->free_count)); 281 out: 282 return; 283} 284 285/** 286 * zfcp_qdio_reqid_check - checks for valid reqids. 287 */ 288static void zfcp_qdio_reqid_check(struct zfcp_adapter *adapter, 289 unsigned long req_id) 290{ 291 struct zfcp_fsf_req *fsf_req; 292 unsigned long flags; 293 294 debug_long_event(adapter->erp_dbf, 4, req_id); 295 296 spin_lock_irqsave(&adapter->req_list_lock, flags); 297 fsf_req = zfcp_reqlist_find(adapter, req_id); 298 299 if (!fsf_req) 300 /* 301 * Unknown request means that we have potentially memory 302 * corruption and must stop the machine immediatly. 303 */ 304 panic("error: unknown request id (%ld) on adapter %s.\n", 305 req_id, zfcp_get_busid_by_adapter(adapter)); 306 307 zfcp_reqlist_remove(adapter, fsf_req); 308 atomic_dec(&adapter->reqs_active); 309 spin_unlock_irqrestore(&adapter->req_list_lock, flags); 310 311 /* finish the FSF request */ 312 zfcp_fsf_req_complete(fsf_req); 313} 314 315/* 316 * function: zfcp_qdio_response_handler 317 * 318 * purpose: is called by QDIO layer for completed SBALs in response queue 319 * 320 * returns: (void) 321 */ 322static void 323zfcp_qdio_response_handler(struct ccw_device *ccw_device, 324 unsigned int status, 325 unsigned int qdio_error, 326 unsigned int siga_error, 327 unsigned int queue_number, 328 int first_element, 329 int elements_processed, 330 unsigned long int_parm) 331{ 332 struct zfcp_adapter *adapter; 333 struct zfcp_qdio_queue *queue; 334 int buffer_index; 335 int i; 336 struct qdio_buffer *buffer; 337 int retval = 0; 338 u8 count; 339 u8 start; 340 volatile struct qdio_buffer_element *buffere = NULL; 341 int buffere_index; 342 343 adapter = (struct zfcp_adapter *) int_parm; 344 queue = &adapter->response_queue; 345 346 if (unlikely(zfcp_qdio_handler_error_check(adapter, status, qdio_error, 347 siga_error, first_element, 348 elements_processed))) 349 goto out; 350 351 /* 352 * we stored address of struct zfcp_adapter data structure 353 * associated with irq in int_parm 354 */ 355 356 buffere = &(queue->buffer[first_element]->element[0]); 357 ZFCP_LOG_DEBUG("first BUFFERE flags=0x%x\n", buffere->flags); 358 /* 359 * go through all SBALs from input queue currently 360 * returned by QDIO layer 361 */ 362 363 for (i = 0; i < elements_processed; i++) { 364 365 buffer_index = first_element + i; 366 buffer_index %= QDIO_MAX_BUFFERS_PER_Q; 367 buffer = queue->buffer[buffer_index]; 368 369 /* go through all SBALEs of SBAL */ 370 for (buffere_index = 0; 371 buffere_index < QDIO_MAX_ELEMENTS_PER_BUFFER; 372 buffere_index++) { 373 374 /* look for QDIO request identifiers in SB */ 375 buffere = &buffer->element[buffere_index]; 376 zfcp_qdio_reqid_check(adapter, 377 (unsigned long) buffere->addr); 378 379 /* 380 * A single used SBALE per inbound SBALE has been 381 * implemented by QDIO so far. Hope they will 382 * do some optimisation. Will need to change to 383 * unlikely() then. 384 */ 385 if (likely(buffere->flags & SBAL_FLAGS_LAST_ENTRY)) 386 break; 387 }; 388 389 if (unlikely(!(buffere->flags & SBAL_FLAGS_LAST_ENTRY))) { 390 ZFCP_LOG_NORMAL("bug: End of inbound data " 391 "not marked!\n"); 392 } 393 } 394 395 /* 396 * put range of SBALs back to response queue 397 * (including SBALs which have already been free before) 398 */ 399 count = atomic_read(&queue->free_count) + elements_processed; 400 start = queue->free_index; 401 402 ZFCP_LOG_TRACE("calling do_QDIO on adapter %s (flags=0x%x, " 403 "queue_no=%i, index_in_queue=%i, count=%i, " 404 "buffers=0x%lx\n", 405 zfcp_get_busid_by_adapter(adapter), 406 QDIO_FLAG_SYNC_INPUT | QDIO_FLAG_UNDER_INTERRUPT, 407 0, start, count, (unsigned long) &queue->buffer[start]); 408 409 retval = do_QDIO(ccw_device, 410 QDIO_FLAG_SYNC_INPUT | QDIO_FLAG_UNDER_INTERRUPT, 411 0, start, count, NULL); 412 413 if (unlikely(retval)) { 414 atomic_set(&queue->free_count, count); 415 ZFCP_LOG_DEBUG("clearing of inbound data regions failed, " 416 "queues may be down " 417 "(count=%d, start=%d, retval=%d)\n", 418 count, start, retval); 419 } else { 420 queue->free_index += count; 421 queue->free_index %= QDIO_MAX_BUFFERS_PER_Q; 422 atomic_set(&queue->free_count, 0); 423 ZFCP_LOG_TRACE("%i buffers enqueued to response " 424 "queue at position %i\n", count, start); 425 } 426 out: 427 return; 428} 429 430/** 431 * zfcp_qdio_sbale_get - return pointer to SBALE of qdio_queue 432 * @queue: queue from which SBALE should be returned 433 * @sbal: specifies number of SBAL in queue 434 * @sbale: specifes number of SBALE in SBAL 435 */ 436static inline volatile struct qdio_buffer_element * 437zfcp_qdio_sbale_get(struct zfcp_qdio_queue *queue, int sbal, int sbale) 438{ 439 return &queue->buffer[sbal]->element[sbale]; 440} 441 442/** 443 * zfcp_qdio_sbale_req - return pointer to SBALE of request_queue for 444 * a struct zfcp_fsf_req 445 */ 446volatile struct qdio_buffer_element * 447zfcp_qdio_sbale_req(struct zfcp_fsf_req *fsf_req, int sbal, int sbale) 448{ 449 return zfcp_qdio_sbale_get(&fsf_req->adapter->request_queue, 450 sbal, sbale); 451} 452 453/** 454 * zfcp_qdio_sbale_resp - return pointer to SBALE of response_queue for 455 * a struct zfcp_fsf_req 456 */ 457static inline volatile struct qdio_buffer_element * 458zfcp_qdio_sbale_resp(struct zfcp_fsf_req *fsf_req, int sbal, int sbale) 459{ 460 return zfcp_qdio_sbale_get(&fsf_req->adapter->response_queue, 461 sbal, sbale); 462} 463 464/** 465 * zfcp_qdio_sbale_curr - return current SBALE on request_queue for 466 * a struct zfcp_fsf_req 467 */ 468volatile struct qdio_buffer_element * 469zfcp_qdio_sbale_curr(struct zfcp_fsf_req *fsf_req) 470{ 471 return zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 472 fsf_req->sbale_curr); 473} 474 475/** 476 * zfcp_qdio_sbal_limit - determine maximum number of SBALs that can be used 477 * on the request_queue for a struct zfcp_fsf_req 478 * @fsf_req: the number of the last SBAL that can be used is stored herein 479 * @max_sbals: used to pass an upper limit for the number of SBALs 480 * 481 * Note: We can assume at least one free SBAL in the request_queue when called. 482 */ 483static void 484zfcp_qdio_sbal_limit(struct zfcp_fsf_req *fsf_req, int max_sbals) 485{ 486 int count = atomic_read(&fsf_req->adapter->request_queue.free_count); 487 count = min(count, max_sbals); 488 fsf_req->sbal_last = fsf_req->sbal_first; 489 fsf_req->sbal_last += (count - 1); 490 fsf_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q; 491} 492 493/** 494 * zfcp_qdio_sbal_chain - chain SBALs if more than one SBAL is needed for a 495 * request 496 * @fsf_req: zfcp_fsf_req to be processed 497 * @sbtype: SBAL flags which have to be set in first SBALE of new SBAL 498 * 499 * This function changes sbal_curr, sbale_curr, sbal_number of fsf_req. 500 */ 501static volatile struct qdio_buffer_element * 502zfcp_qdio_sbal_chain(struct zfcp_fsf_req *fsf_req, unsigned long sbtype) 503{ 504 volatile struct qdio_buffer_element *sbale; 505 506 /* set last entry flag in current SBALE of current SBAL */ 507 sbale = zfcp_qdio_sbale_curr(fsf_req); 508 sbale->flags |= SBAL_FLAGS_LAST_ENTRY; 509 510 /* don't exceed last allowed SBAL */ 511 if (fsf_req->sbal_curr == fsf_req->sbal_last) 512 return NULL; 513 514 /* set chaining flag in first SBALE of current SBAL */ 515 sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0); 516 sbale->flags |= SBAL_FLAGS0_MORE_SBALS; 517 518 /* calculate index of next SBAL */ 519 fsf_req->sbal_curr++; 520 fsf_req->sbal_curr %= QDIO_MAX_BUFFERS_PER_Q; 521 522 /* keep this requests number of SBALs up-to-date */ 523 fsf_req->sbal_number++; 524 525 /* start at first SBALE of new SBAL */ 526 fsf_req->sbale_curr = 0; 527 528 /* set storage-block type for new SBAL */ 529 sbale = zfcp_qdio_sbale_curr(fsf_req); 530 sbale->flags |= sbtype; 531 532 return sbale; 533} 534 535/** 536 * zfcp_qdio_sbale_next - switch to next SBALE, chain SBALs if needed 537 */ 538static volatile struct qdio_buffer_element * 539zfcp_qdio_sbale_next(struct zfcp_fsf_req *fsf_req, unsigned long sbtype) 540{ 541 if (fsf_req->sbale_curr == ZFCP_LAST_SBALE_PER_SBAL) 542 return zfcp_qdio_sbal_chain(fsf_req, sbtype); 543 544 fsf_req->sbale_curr++; 545 546 return zfcp_qdio_sbale_curr(fsf_req); 547} 548 549/** 550 * zfcp_qdio_sbals_zero - initialize SBALs between first and last in queue 551 * with zero from 552 */ 553static int 554zfcp_qdio_sbals_zero(struct zfcp_qdio_queue *queue, int first, int last) 555{ 556 struct qdio_buffer **buf = queue->buffer; 557 int curr = first; 558 int count = 0; 559 560 for(;;) { 561 curr %= QDIO_MAX_BUFFERS_PER_Q; 562 count++; 563 memset(buf[curr], 0, sizeof(struct qdio_buffer)); 564 if (curr == last) 565 break; 566 curr++; 567 } 568 return count; 569} 570 571 572/** 573 * zfcp_qdio_sbals_wipe - reset all changes in SBALs for an fsf_req 574 */ 575static inline int 576zfcp_qdio_sbals_wipe(struct zfcp_fsf_req *fsf_req) 577{ 578 return zfcp_qdio_sbals_zero(&fsf_req->adapter->request_queue, 579 fsf_req->sbal_first, fsf_req->sbal_curr); 580} 581 582 583/** 584 * zfcp_qdio_sbale_fill - set address and lenght in current SBALE 585 * on request_queue 586 */ 587static void 588zfcp_qdio_sbale_fill(struct zfcp_fsf_req *fsf_req, unsigned long sbtype, 589 void *addr, int length) 590{ 591 volatile struct qdio_buffer_element *sbale; 592 593 sbale = zfcp_qdio_sbale_curr(fsf_req); 594 sbale->addr = addr; 595 sbale->length = length; 596} 597 598/** 599 * zfcp_qdio_sbals_from_segment - map memory segment to SBALE(s) 600 * @fsf_req: request to be processed 601 * @sbtype: SBALE flags 602 * @start_addr: address of memory segment 603 * @total_length: length of memory segment 604 * 605 * Alignment and length of the segment determine how many SBALEs are needed 606 * for the memory segment. 607 */ 608static int 609zfcp_qdio_sbals_from_segment(struct zfcp_fsf_req *fsf_req, unsigned long sbtype, 610 void *start_addr, unsigned long total_length) 611{ 612 unsigned long remaining, length; 613 void *addr; 614 615 /* split segment up heeding page boundaries */ 616 for (addr = start_addr, remaining = total_length; remaining > 0; 617 addr += length, remaining -= length) { 618 /* get next free SBALE for new piece */ 619 if (NULL == zfcp_qdio_sbale_next(fsf_req, sbtype)) { 620 /* no SBALE left, clean up and leave */ 621 zfcp_qdio_sbals_wipe(fsf_req); 622 return -EINVAL; 623 } 624 /* calculate length of new piece */ 625 length = min(remaining, 626 (PAGE_SIZE - ((unsigned long) addr & 627 (PAGE_SIZE - 1)))); 628 /* fill current SBALE with calculated piece */ 629 zfcp_qdio_sbale_fill(fsf_req, sbtype, addr, length); 630 } 631 return total_length; 632} 633 634 635/** 636 * zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list 637 * @fsf_req: request to be processed 638 * @sbtype: SBALE flags 639 * @sg: scatter-gather list 640 * @sg_count: number of elements in scatter-gather list 641 * @max_sbals: upper bound for number of SBALs to be used 642 */ 643int 644zfcp_qdio_sbals_from_sg(struct zfcp_fsf_req *fsf_req, unsigned long sbtype, 645 struct scatterlist *sg, int sg_count, int max_sbals) 646{ 647 int sg_index; 648 struct scatterlist *sg_segment; 649 int retval; 650 volatile struct qdio_buffer_element *sbale; 651 int bytes = 0; 652 653 /* figure out last allowed SBAL */ 654 zfcp_qdio_sbal_limit(fsf_req, max_sbals); 655 656 /* set storage-block type for current SBAL */ 657 sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0); 658 sbale->flags |= sbtype; 659 660 /* process all segements of scatter-gather list */ 661 for (sg_index = 0, sg_segment = sg, bytes = 0; 662 sg_index < sg_count; 663 sg_index++, sg_segment++) { 664 retval = zfcp_qdio_sbals_from_segment( 665 fsf_req, 666 sbtype, 667 zfcp_sg_to_address(sg_segment), 668 sg_segment->length); 669 if (retval < 0) { 670 bytes = retval; 671 goto out; 672 } else 673 bytes += retval; 674 } 675 /* assume that no other SBALEs are to follow in the same SBAL */ 676 sbale = zfcp_qdio_sbale_curr(fsf_req); 677 sbale->flags |= SBAL_FLAGS_LAST_ENTRY; 678out: 679 return bytes; 680} 681 682 683/** 684 * zfcp_qdio_sbals_from_buffer - fill SBALs from buffer 685 * @fsf_req: request to be processed 686 * @sbtype: SBALE flags 687 * @buffer: data buffer 688 * @length: length of buffer 689 * @max_sbals: upper bound for number of SBALs to be used 690 */ 691static int 692zfcp_qdio_sbals_from_buffer(struct zfcp_fsf_req *fsf_req, unsigned long sbtype, 693 void *buffer, unsigned long length, int max_sbals) 694{ 695 struct scatterlist sg_segment; 696 697 zfcp_address_to_sg(buffer, &sg_segment); 698 sg_segment.length = length; 699 700 return zfcp_qdio_sbals_from_sg(fsf_req, sbtype, &sg_segment, 1, 701 max_sbals); 702} 703 704 705/** 706 * zfcp_qdio_sbals_from_scsicmnd - fill SBALs from scsi command 707 * @fsf_req: request to be processed 708 * @sbtype: SBALE flags 709 * @scsi_cmnd: either scatter-gather list or buffer contained herein is used 710 * to fill SBALs 711 */ 712int 713zfcp_qdio_sbals_from_scsicmnd(struct zfcp_fsf_req *fsf_req, 714 unsigned long sbtype, struct scsi_cmnd *scsi_cmnd) 715{ 716 if (scsi_cmnd->use_sg) { 717 return zfcp_qdio_sbals_from_sg(fsf_req, sbtype, 718 (struct scatterlist *) 719 scsi_cmnd->request_buffer, 720 scsi_cmnd->use_sg, 721 ZFCP_MAX_SBALS_PER_REQ); 722 } else { 723 return zfcp_qdio_sbals_from_buffer(fsf_req, sbtype, 724 scsi_cmnd->request_buffer, 725 scsi_cmnd->request_bufflen, 726 ZFCP_MAX_SBALS_PER_REQ); 727 } 728} 729 730/** 731 * zfcp_qdio_determine_pci - set PCI flag in first SBALE on qdio queue if needed 732 */ 733int 734zfcp_qdio_determine_pci(struct zfcp_qdio_queue *req_queue, 735 struct zfcp_fsf_req *fsf_req) 736{ 737 int new_distance_from_int; 738 int pci_pos; 739 volatile struct qdio_buffer_element *sbale; 740 741 new_distance_from_int = req_queue->distance_from_int + 742 fsf_req->sbal_number; 743 744 if (unlikely(new_distance_from_int >= ZFCP_QDIO_PCI_INTERVAL)) { 745 new_distance_from_int %= ZFCP_QDIO_PCI_INTERVAL; 746 pci_pos = fsf_req->sbal_first; 747 pci_pos += fsf_req->sbal_number; 748 pci_pos -= new_distance_from_int; 749 pci_pos -= 1; 750 pci_pos %= QDIO_MAX_BUFFERS_PER_Q; 751 sbale = zfcp_qdio_sbale_req(fsf_req, pci_pos, 0); 752 sbale->flags |= SBAL_FLAGS0_PCI; 753 } 754 return new_distance_from_int; 755} 756 757/* 758 * function: zfcp_zero_sbals 759 * 760 * purpose: zeros specified range of SBALs 761 * 762 * returns: 763 */ 764void 765zfcp_qdio_zero_sbals(struct qdio_buffer *buf[], int first, int clean_count) 766{ 767 int cur_pos; 768 int index; 769 770 for (cur_pos = first; cur_pos < (first + clean_count); cur_pos++) { 771 index = cur_pos % QDIO_MAX_BUFFERS_PER_Q; 772 memset(buf[index], 0, sizeof (struct qdio_buffer)); 773 ZFCP_LOG_TRACE("zeroing BUFFER %d at address %p\n", 774 index, buf[index]); 775 } 776} 777 778#undef ZFCP_LOG_AREA 779