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 24 static inline void zfcp_qdio_sbal_limit(struct zfcp_fsf_req *, int); 25 static inline volatile struct qdio_buffer_element *zfcp_qdio_sbale_get 26 (struct zfcp_qdio_queue *, int, int); 27 static inline volatile struct qdio_buffer_element *zfcp_qdio_sbale_resp 28 (struct zfcp_fsf_req *, int, int); 29 static inline volatile struct qdio_buffer_element *zfcp_qdio_sbal_chain 30 (struct zfcp_fsf_req *, unsigned long); 31 static inline volatile struct qdio_buffer_element *zfcp_qdio_sbale_next 32 (struct zfcp_fsf_req *, unsigned long); 33 static inline int zfcp_qdio_sbals_zero(struct zfcp_qdio_queue *, int, int); 34 static inline int zfcp_qdio_sbals_wipe(struct zfcp_fsf_req *); 35 static inline void zfcp_qdio_sbale_fill 36 (struct zfcp_fsf_req *, unsigned long, void *, int); 37 static inline int zfcp_qdio_sbals_from_segment 38 (struct zfcp_fsf_req *, unsigned long, void *, unsigned long); 39 static inline int zfcp_qdio_sbals_from_buffer 40 (struct zfcp_fsf_req *, unsigned long, void *, unsigned long, int); 41 42 static qdio_handler_t zfcp_qdio_request_handler; 43 static qdio_handler_t zfcp_qdio_response_handler; 44 static 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 */ 58 static int 59 zfcp_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 */ 98 static void 99 zfcp_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 */ 113 int 114 zfcp_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 */ 150 void 151 zfcp_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 } 161 162 int 163 zfcp_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 */ 204 static inline int 205 zfcp_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 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 */ 243 static void 244 zfcp_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 * function: zfcp_qdio_response_handler 287 * 288 * purpose: is called by QDIO layer for completed SBALs in response queue 289 * 290 * returns: (void) 291 */ 292 static void 293 zfcp_qdio_response_handler(struct ccw_device *ccw_device, 294 unsigned int status, 295 unsigned int qdio_error, 296 unsigned int siga_error, 297 unsigned int queue_number, 298 int first_element, 299 int elements_processed, 300 unsigned long int_parm) 301 { 302 struct zfcp_adapter *adapter; 303 struct zfcp_qdio_queue *queue; 304 int buffer_index; 305 int i; 306 struct qdio_buffer *buffer; 307 int retval = 0; 308 u8 count; 309 u8 start; 310 volatile struct qdio_buffer_element *buffere = NULL; 311 int buffere_index; 312 313 adapter = (struct zfcp_adapter *) int_parm; 314 queue = &adapter->response_queue; 315 316 if (unlikely(zfcp_qdio_handler_error_check(adapter, status, qdio_error, 317 siga_error, first_element, 318 elements_processed))) 319 goto out; 320 321 /* 322 * we stored address of struct zfcp_adapter data structure 323 * associated with irq in int_parm 324 */ 325 326 buffere = &(queue->buffer[first_element]->element[0]); 327 ZFCP_LOG_DEBUG("first BUFFERE flags=0x%x\n", buffere->flags); 328 /* 329 * go through all SBALs from input queue currently 330 * returned by QDIO layer 331 */ 332 333 for (i = 0; i < elements_processed; i++) { 334 335 buffer_index = first_element + i; 336 buffer_index %= QDIO_MAX_BUFFERS_PER_Q; 337 buffer = queue->buffer[buffer_index]; 338 339 /* go through all SBALEs of SBAL */ 340 for (buffere_index = 0; 341 buffere_index < QDIO_MAX_ELEMENTS_PER_BUFFER; 342 buffere_index++) { 343 344 /* look for QDIO request identifiers in SB */ 345 buffere = &buffer->element[buffere_index]; 346 retval = zfcp_qdio_reqid_check(adapter, 347 (void *) buffere->addr); 348 349 if (retval) { 350 ZFCP_LOG_NORMAL("bug: unexpected inbound " 351 "packet on adapter %s " 352 "(reqid=0x%lx, " 353 "first_element=%d, " 354 "elements_processed=%d)\n", 355 zfcp_get_busid_by_adapter(adapter), 356 (unsigned long) buffere->addr, 357 first_element, 358 elements_processed); 359 ZFCP_LOG_NORMAL("hex dump of inbound buffer " 360 "at address %p " 361 "(buffer_index=%d, " 362 "buffere_index=%d)\n", buffer, 363 buffer_index, buffere_index); 364 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL, 365 (char *) buffer, SBAL_SIZE); 366 } 367 /* 368 * A single used SBALE per inbound SBALE has been 369 * implemented by QDIO so far. Hope they will 370 * do some optimisation. Will need to change to 371 * unlikely() then. 372 */ 373 if (likely(buffere->flags & SBAL_FLAGS_LAST_ENTRY)) 374 break; 375 }; 376 377 if (unlikely(!(buffere->flags & SBAL_FLAGS_LAST_ENTRY))) { 378 ZFCP_LOG_NORMAL("bug: End of inbound data " 379 "not marked!\n"); 380 } 381 } 382 383 /* 384 * put range of SBALs back to response queue 385 * (including SBALs which have already been free before) 386 */ 387 count = atomic_read(&queue->free_count) + elements_processed; 388 start = queue->free_index; 389 390 ZFCP_LOG_TRACE("calling do_QDIO on adapter %s (flags=0x%x, " 391 "queue_no=%i, index_in_queue=%i, count=%i, " 392 "buffers=0x%lx\n", 393 zfcp_get_busid_by_adapter(adapter), 394 QDIO_FLAG_SYNC_INPUT | QDIO_FLAG_UNDER_INTERRUPT, 395 0, start, count, (unsigned long) &queue->buffer[start]); 396 397 retval = do_QDIO(ccw_device, 398 QDIO_FLAG_SYNC_INPUT | QDIO_FLAG_UNDER_INTERRUPT, 399 0, start, count, NULL); 400 401 if (unlikely(retval)) { 402 atomic_set(&queue->free_count, count); 403 ZFCP_LOG_DEBUG("clearing of inbound data regions failed, " 404 "queues may be down " 405 "(count=%d, start=%d, retval=%d)\n", 406 count, start, retval); 407 } else { 408 queue->free_index += count; 409 queue->free_index %= QDIO_MAX_BUFFERS_PER_Q; 410 atomic_set(&queue->free_count, 0); 411 ZFCP_LOG_TRACE("%i buffers enqueued to response " 412 "queue at position %i\n", count, start); 413 } 414 out: 415 return; 416 } 417 418 /* 419 * function: zfcp_qdio_reqid_check 420 * 421 * purpose: checks for valid reqids or unsolicited status 422 * 423 * returns: 0 - valid request id or unsolicited status 424 * !0 - otherwise 425 */ 426 int 427 zfcp_qdio_reqid_check(struct zfcp_adapter *adapter, void *sbale_addr) 428 { 429 struct zfcp_fsf_req *fsf_req; 430 431 /* invalid (per convention used in this driver) */ 432 if (unlikely(!sbale_addr)) { 433 ZFCP_LOG_NORMAL("bug: invalid reqid\n"); 434 return -EINVAL; 435 } 436 437 /* valid request id and thus (hopefully :) valid fsf_req address */ 438 fsf_req = (struct zfcp_fsf_req *) sbale_addr; 439 440 /* serialize with zfcp_fsf_req_dismiss_all */ 441 spin_lock(&adapter->fsf_req_list_lock); 442 if (list_empty(&adapter->fsf_req_list_head)) { 443 spin_unlock(&adapter->fsf_req_list_lock); 444 return 0; 445 } 446 list_del(&fsf_req->list); 447 atomic_dec(&adapter->fsf_reqs_active); 448 spin_unlock(&adapter->fsf_req_list_lock); 449 450 if (unlikely(adapter != fsf_req->adapter)) { 451 ZFCP_LOG_NORMAL("bug: invalid reqid (fsf_req=%p, " 452 "fsf_req->adapter=%p, adapter=%p)\n", 453 fsf_req, fsf_req->adapter, adapter); 454 return -EINVAL; 455 } 456 457 /* finish the FSF request */ 458 zfcp_fsf_req_complete(fsf_req); 459 460 return 0; 461 } 462 463 /** 464 * zfcp_qdio_sbale_get - return pointer to SBALE of qdio_queue 465 * @queue: queue from which SBALE should be returned 466 * @sbal: specifies number of SBAL in queue 467 * @sbale: specifes number of SBALE in SBAL 468 */ 469 static inline volatile struct qdio_buffer_element * 470 zfcp_qdio_sbale_get(struct zfcp_qdio_queue *queue, int sbal, int sbale) 471 { 472 return &queue->buffer[sbal]->element[sbale]; 473 } 474 475 /** 476 * zfcp_qdio_sbale_req - return pointer to SBALE of request_queue for 477 * a struct zfcp_fsf_req 478 */ 479 inline volatile struct qdio_buffer_element * 480 zfcp_qdio_sbale_req(struct zfcp_fsf_req *fsf_req, int sbal, int sbale) 481 { 482 return zfcp_qdio_sbale_get(&fsf_req->adapter->request_queue, 483 sbal, sbale); 484 } 485 486 /** 487 * zfcp_qdio_sbale_resp - return pointer to SBALE of response_queue for 488 * a struct zfcp_fsf_req 489 */ 490 static inline volatile struct qdio_buffer_element * 491 zfcp_qdio_sbale_resp(struct zfcp_fsf_req *fsf_req, int sbal, int sbale) 492 { 493 return zfcp_qdio_sbale_get(&fsf_req->adapter->response_queue, 494 sbal, sbale); 495 } 496 497 /** 498 * zfcp_qdio_sbale_curr - return current SBALE on request_queue for 499 * a struct zfcp_fsf_req 500 */ 501 inline volatile struct qdio_buffer_element * 502 zfcp_qdio_sbale_curr(struct zfcp_fsf_req *fsf_req) 503 { 504 return zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 505 fsf_req->sbale_curr); 506 } 507 508 /** 509 * zfcp_qdio_sbal_limit - determine maximum number of SBALs that can be used 510 * on the request_queue for a struct zfcp_fsf_req 511 * @fsf_req: the number of the last SBAL that can be used is stored herein 512 * @max_sbals: used to pass an upper limit for the number of SBALs 513 * 514 * Note: We can assume at least one free SBAL in the request_queue when called. 515 */ 516 static inline void 517 zfcp_qdio_sbal_limit(struct zfcp_fsf_req *fsf_req, int max_sbals) 518 { 519 int count = atomic_read(&fsf_req->adapter->request_queue.free_count); 520 count = min(count, max_sbals); 521 fsf_req->sbal_last = fsf_req->sbal_first; 522 fsf_req->sbal_last += (count - 1); 523 fsf_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q; 524 } 525 526 /** 527 * zfcp_qdio_sbal_chain - chain SBALs if more than one SBAL is needed for a 528 * request 529 * @fsf_req: zfcp_fsf_req to be processed 530 * @sbtype: SBAL flags which have to be set in first SBALE of new SBAL 531 * 532 * This function changes sbal_curr, sbale_curr, sbal_number of fsf_req. 533 */ 534 static inline volatile struct qdio_buffer_element * 535 zfcp_qdio_sbal_chain(struct zfcp_fsf_req *fsf_req, unsigned long sbtype) 536 { 537 volatile struct qdio_buffer_element *sbale; 538 539 /* set last entry flag in current SBALE of current SBAL */ 540 sbale = zfcp_qdio_sbale_curr(fsf_req); 541 sbale->flags |= SBAL_FLAGS_LAST_ENTRY; 542 543 /* don't exceed last allowed SBAL */ 544 if (fsf_req->sbal_curr == fsf_req->sbal_last) 545 return NULL; 546 547 /* set chaining flag in first SBALE of current SBAL */ 548 sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0); 549 sbale->flags |= SBAL_FLAGS0_MORE_SBALS; 550 551 /* calculate index of next SBAL */ 552 fsf_req->sbal_curr++; 553 fsf_req->sbal_curr %= QDIO_MAX_BUFFERS_PER_Q; 554 555 /* keep this requests number of SBALs up-to-date */ 556 fsf_req->sbal_number++; 557 558 /* start at first SBALE of new SBAL */ 559 fsf_req->sbale_curr = 0; 560 561 /* set storage-block type for new SBAL */ 562 sbale = zfcp_qdio_sbale_curr(fsf_req); 563 sbale->flags |= sbtype; 564 565 return sbale; 566 } 567 568 /** 569 * zfcp_qdio_sbale_next - switch to next SBALE, chain SBALs if needed 570 */ 571 static inline volatile struct qdio_buffer_element * 572 zfcp_qdio_sbale_next(struct zfcp_fsf_req *fsf_req, unsigned long sbtype) 573 { 574 if (fsf_req->sbale_curr == ZFCP_LAST_SBALE_PER_SBAL) 575 return zfcp_qdio_sbal_chain(fsf_req, sbtype); 576 577 fsf_req->sbale_curr++; 578 579 return zfcp_qdio_sbale_curr(fsf_req); 580 } 581 582 /** 583 * zfcp_qdio_sbals_zero - initialize SBALs between first and last in queue 584 * with zero from 585 */ 586 static inline int 587 zfcp_qdio_sbals_zero(struct zfcp_qdio_queue *queue, int first, int last) 588 { 589 struct qdio_buffer **buf = queue->buffer; 590 int curr = first; 591 int count = 0; 592 593 for(;;) { 594 curr %= QDIO_MAX_BUFFERS_PER_Q; 595 count++; 596 memset(buf[curr], 0, sizeof(struct qdio_buffer)); 597 if (curr == last) 598 break; 599 curr++; 600 } 601 return count; 602 } 603 604 605 /** 606 * zfcp_qdio_sbals_wipe - reset all changes in SBALs for an fsf_req 607 */ 608 static inline int 609 zfcp_qdio_sbals_wipe(struct zfcp_fsf_req *fsf_req) 610 { 611 return zfcp_qdio_sbals_zero(&fsf_req->adapter->request_queue, 612 fsf_req->sbal_first, fsf_req->sbal_curr); 613 } 614 615 616 /** 617 * zfcp_qdio_sbale_fill - set address and lenght in current SBALE 618 * on request_queue 619 */ 620 static inline void 621 zfcp_qdio_sbale_fill(struct zfcp_fsf_req *fsf_req, unsigned long sbtype, 622 void *addr, int length) 623 { 624 volatile struct qdio_buffer_element *sbale; 625 626 sbale = zfcp_qdio_sbale_curr(fsf_req); 627 sbale->addr = addr; 628 sbale->length = length; 629 } 630 631 /** 632 * zfcp_qdio_sbals_from_segment - map memory segment to SBALE(s) 633 * @fsf_req: request to be processed 634 * @sbtype: SBALE flags 635 * @start_addr: address of memory segment 636 * @total_length: length of memory segment 637 * 638 * Alignment and length of the segment determine how many SBALEs are needed 639 * for the memory segment. 640 */ 641 static inline int 642 zfcp_qdio_sbals_from_segment(struct zfcp_fsf_req *fsf_req, unsigned long sbtype, 643 void *start_addr, unsigned long total_length) 644 { 645 unsigned long remaining, length; 646 void *addr; 647 648 /* split segment up heeding page boundaries */ 649 for (addr = start_addr, remaining = total_length; remaining > 0; 650 addr += length, remaining -= length) { 651 /* get next free SBALE for new piece */ 652 if (NULL == zfcp_qdio_sbale_next(fsf_req, sbtype)) { 653 /* no SBALE left, clean up and leave */ 654 zfcp_qdio_sbals_wipe(fsf_req); 655 return -EINVAL; 656 } 657 /* calculate length of new piece */ 658 length = min(remaining, 659 (PAGE_SIZE - ((unsigned long) addr & 660 (PAGE_SIZE - 1)))); 661 /* fill current SBALE with calculated piece */ 662 zfcp_qdio_sbale_fill(fsf_req, sbtype, addr, length); 663 } 664 return total_length; 665 } 666 667 668 /** 669 * zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list 670 * @fsf_req: request to be processed 671 * @sbtype: SBALE flags 672 * @sg: scatter-gather list 673 * @sg_count: number of elements in scatter-gather list 674 * @max_sbals: upper bound for number of SBALs to be used 675 */ 676 inline int 677 zfcp_qdio_sbals_from_sg(struct zfcp_fsf_req *fsf_req, unsigned long sbtype, 678 struct scatterlist *sg, int sg_count, int max_sbals) 679 { 680 int sg_index; 681 struct scatterlist *sg_segment; 682 int retval; 683 volatile struct qdio_buffer_element *sbale; 684 int bytes = 0; 685 686 /* figure out last allowed SBAL */ 687 zfcp_qdio_sbal_limit(fsf_req, max_sbals); 688 689 /* set storage-block type for current SBAL */ 690 sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0); 691 sbale->flags |= sbtype; 692 693 /* process all segements of scatter-gather list */ 694 for (sg_index = 0, sg_segment = sg, bytes = 0; 695 sg_index < sg_count; 696 sg_index++, sg_segment++) { 697 retval = zfcp_qdio_sbals_from_segment( 698 fsf_req, 699 sbtype, 700 zfcp_sg_to_address(sg_segment), 701 sg_segment->length); 702 if (retval < 0) { 703 bytes = retval; 704 goto out; 705 } else 706 bytes += retval; 707 } 708 /* assume that no other SBALEs are to follow in the same SBAL */ 709 sbale = zfcp_qdio_sbale_curr(fsf_req); 710 sbale->flags |= SBAL_FLAGS_LAST_ENTRY; 711 out: 712 return bytes; 713 } 714 715 716 /** 717 * zfcp_qdio_sbals_from_buffer - fill SBALs from buffer 718 * @fsf_req: request to be processed 719 * @sbtype: SBALE flags 720 * @buffer: data buffer 721 * @length: length of buffer 722 * @max_sbals: upper bound for number of SBALs to be used 723 */ 724 static inline int 725 zfcp_qdio_sbals_from_buffer(struct zfcp_fsf_req *fsf_req, unsigned long sbtype, 726 void *buffer, unsigned long length, int max_sbals) 727 { 728 struct scatterlist sg_segment; 729 730 zfcp_address_to_sg(buffer, &sg_segment); 731 sg_segment.length = length; 732 733 return zfcp_qdio_sbals_from_sg(fsf_req, sbtype, &sg_segment, 1, 734 max_sbals); 735 } 736 737 738 /** 739 * zfcp_qdio_sbals_from_scsicmnd - fill SBALs from scsi command 740 * @fsf_req: request to be processed 741 * @sbtype: SBALE flags 742 * @scsi_cmnd: either scatter-gather list or buffer contained herein is used 743 * to fill SBALs 744 */ 745 inline int 746 zfcp_qdio_sbals_from_scsicmnd(struct zfcp_fsf_req *fsf_req, 747 unsigned long sbtype, struct scsi_cmnd *scsi_cmnd) 748 { 749 if (scsi_cmnd->use_sg) { 750 return zfcp_qdio_sbals_from_sg(fsf_req, sbtype, 751 (struct scatterlist *) 752 scsi_cmnd->request_buffer, 753 scsi_cmnd->use_sg, 754 ZFCP_MAX_SBALS_PER_REQ); 755 } else { 756 return zfcp_qdio_sbals_from_buffer(fsf_req, sbtype, 757 scsi_cmnd->request_buffer, 758 scsi_cmnd->request_bufflen, 759 ZFCP_MAX_SBALS_PER_REQ); 760 } 761 } 762 763 /** 764 * zfcp_qdio_determine_pci - set PCI flag in first SBALE on qdio queue if needed 765 */ 766 int 767 zfcp_qdio_determine_pci(struct zfcp_qdio_queue *req_queue, 768 struct zfcp_fsf_req *fsf_req) 769 { 770 int new_distance_from_int; 771 int pci_pos; 772 volatile struct qdio_buffer_element *sbale; 773 774 new_distance_from_int = req_queue->distance_from_int + 775 fsf_req->sbal_number; 776 777 if (unlikely(new_distance_from_int >= ZFCP_QDIO_PCI_INTERVAL)) { 778 new_distance_from_int %= ZFCP_QDIO_PCI_INTERVAL; 779 pci_pos = fsf_req->sbal_first; 780 pci_pos += fsf_req->sbal_number; 781 pci_pos -= new_distance_from_int; 782 pci_pos -= 1; 783 pci_pos %= QDIO_MAX_BUFFERS_PER_Q; 784 sbale = zfcp_qdio_sbale_req(fsf_req, pci_pos, 0); 785 sbale->flags |= SBAL_FLAGS0_PCI; 786 } 787 return new_distance_from_int; 788 } 789 790 /* 791 * function: zfcp_zero_sbals 792 * 793 * purpose: zeros specified range of SBALs 794 * 795 * returns: 796 */ 797 void 798 zfcp_qdio_zero_sbals(struct qdio_buffer *buf[], int first, int clean_count) 799 { 800 int cur_pos; 801 int index; 802 803 for (cur_pos = first; cur_pos < (first + clean_count); cur_pos++) { 804 index = cur_pos % QDIO_MAX_BUFFERS_PER_Q; 805 memset(buf[index], 0, sizeof (struct qdio_buffer)); 806 ZFCP_LOG_TRACE("zeroing BUFFER %d at address %p\n", 807 index, buf[index]); 808 } 809 } 810 811 #undef ZFCP_LOG_AREA 812