ipath_file_ops.c revision eaf6733bc176742fb08def2269441684e963c275
1/* 2 * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 */ 32 33#include <linux/pci.h> 34#include <linux/poll.h> 35#include <linux/cdev.h> 36#include <linux/swap.h> 37#include <linux/vmalloc.h> 38#include <asm/pgtable.h> 39 40#include "ipath_kernel.h" 41#include "ips_common.h" 42#include "ipath_layer.h" 43 44static int ipath_open(struct inode *, struct file *); 45static int ipath_close(struct inode *, struct file *); 46static ssize_t ipath_write(struct file *, const char __user *, size_t, 47 loff_t *); 48static unsigned int ipath_poll(struct file *, struct poll_table_struct *); 49static int ipath_mmap(struct file *, struct vm_area_struct *); 50 51static struct file_operations ipath_file_ops = { 52 .owner = THIS_MODULE, 53 .write = ipath_write, 54 .open = ipath_open, 55 .release = ipath_close, 56 .poll = ipath_poll, 57 .mmap = ipath_mmap 58}; 59 60static int ipath_get_base_info(struct ipath_portdata *pd, 61 void __user *ubase, size_t ubase_size) 62{ 63 int ret = 0; 64 struct ipath_base_info *kinfo = NULL; 65 struct ipath_devdata *dd = pd->port_dd; 66 67 if (ubase_size < sizeof(*kinfo)) { 68 ipath_cdbg(PROC, 69 "Base size %lu, need %lu (version mismatch?)\n", 70 (unsigned long) ubase_size, 71 (unsigned long) sizeof(*kinfo)); 72 ret = -EINVAL; 73 goto bail; 74 } 75 76 kinfo = kzalloc(sizeof(*kinfo), GFP_KERNEL); 77 if (kinfo == NULL) { 78 ret = -ENOMEM; 79 goto bail; 80 } 81 82 ret = dd->ipath_f_get_base_info(pd, kinfo); 83 if (ret < 0) 84 goto bail; 85 86 kinfo->spi_rcvhdr_cnt = dd->ipath_rcvhdrcnt; 87 kinfo->spi_rcvhdrent_size = dd->ipath_rcvhdrentsize; 88 kinfo->spi_tidegrcnt = dd->ipath_rcvegrcnt; 89 kinfo->spi_rcv_egrbufsize = dd->ipath_rcvegrbufsize; 90 /* 91 * have to mmap whole thing 92 */ 93 kinfo->spi_rcv_egrbuftotlen = 94 pd->port_rcvegrbuf_chunks * pd->port_rcvegrbuf_size; 95 kinfo->spi_rcv_egrperchunk = pd->port_rcvegrbufs_perchunk; 96 kinfo->spi_rcv_egrchunksize = kinfo->spi_rcv_egrbuftotlen / 97 pd->port_rcvegrbuf_chunks; 98 kinfo->spi_tidcnt = dd->ipath_rcvtidcnt; 99 /* 100 * for this use, may be ipath_cfgports summed over all chips that 101 * are are configured and present 102 */ 103 kinfo->spi_nports = dd->ipath_cfgports; 104 /* unit (chip/board) our port is on */ 105 kinfo->spi_unit = dd->ipath_unit; 106 /* for now, only a single page */ 107 kinfo->spi_tid_maxsize = PAGE_SIZE; 108 109 /* 110 * Doing this per port, and based on the skip value, etc. This has 111 * to be the actual buffer size, since the protocol code treats it 112 * as an array. 113 * 114 * These have to be set to user addresses in the user code via mmap. 115 * These values are used on return to user code for the mmap target 116 * addresses only. For 32 bit, same 44 bit address problem, so use 117 * the physical address, not virtual. Before 2.6.11, using the 118 * page_address() macro worked, but in 2.6.11, even that returns the 119 * full 64 bit address (upper bits all 1's). So far, using the 120 * physical addresses (or chip offsets, for chip mapping) works, but 121 * no doubt some future kernel release will chang that, and we'll be 122 * on to yet another method of dealing with this 123 */ 124 kinfo->spi_rcvhdr_base = (u64) pd->port_rcvhdrq_phys; 125 kinfo->spi_rcv_egrbufs = (u64) pd->port_rcvegr_phys; 126 kinfo->spi_pioavailaddr = (u64) dd->ipath_pioavailregs_phys; 127 kinfo->spi_status = (u64) kinfo->spi_pioavailaddr + 128 (void *) dd->ipath_statusp - 129 (void *) dd->ipath_pioavailregs_dma; 130 kinfo->spi_piobufbase = (u64) pd->port_piobufs; 131 kinfo->__spi_uregbase = 132 dd->ipath_uregbase + dd->ipath_palign * pd->port_port; 133 134 kinfo->spi_pioindex = dd->ipath_pbufsport * (pd->port_port - 1); 135 kinfo->spi_piocnt = dd->ipath_pbufsport; 136 kinfo->spi_pioalign = dd->ipath_palign; 137 138 kinfo->spi_qpair = IPATH_KD_QP; 139 kinfo->spi_piosize = dd->ipath_ibmaxlen; 140 kinfo->spi_mtu = dd->ipath_ibmaxlen; /* maxlen, not ibmtu */ 141 kinfo->spi_port = pd->port_port; 142 kinfo->spi_sw_version = IPATH_KERN_SWVERSION; 143 kinfo->spi_hw_version = dd->ipath_revision; 144 145 if (copy_to_user(ubase, kinfo, sizeof(*kinfo))) 146 ret = -EFAULT; 147 148bail: 149 kfree(kinfo); 150 return ret; 151} 152 153/** 154 * ipath_tid_update - update a port TID 155 * @pd: the port 156 * @ti: the TID information 157 * 158 * The new implementation as of Oct 2004 is that the driver assigns 159 * the tid and returns it to the caller. To make it easier to 160 * catch bugs, and to reduce search time, we keep a cursor for 161 * each port, walking the shadow tid array to find one that's not 162 * in use. 163 * 164 * For now, if we can't allocate the full list, we fail, although 165 * in the long run, we'll allocate as many as we can, and the 166 * caller will deal with that by trying the remaining pages later. 167 * That means that when we fail, we have to mark the tids as not in 168 * use again, in our shadow copy. 169 * 170 * It's up to the caller to free the tids when they are done. 171 * We'll unlock the pages as they free them. 172 * 173 * Also, right now we are locking one page at a time, but since 174 * the intended use of this routine is for a single group of 175 * virtually contiguous pages, that should change to improve 176 * performance. 177 */ 178static int ipath_tid_update(struct ipath_portdata *pd, 179 const struct ipath_tid_info *ti) 180{ 181 int ret = 0, ntids; 182 u32 tid, porttid, cnt, i, tidcnt; 183 u16 *tidlist; 184 struct ipath_devdata *dd = pd->port_dd; 185 u64 physaddr; 186 unsigned long vaddr; 187 u64 __iomem *tidbase; 188 unsigned long tidmap[8]; 189 struct page **pagep = NULL; 190 191 if (!dd->ipath_pageshadow) { 192 ret = -ENOMEM; 193 goto done; 194 } 195 196 cnt = ti->tidcnt; 197 if (!cnt) { 198 ipath_dbg("After copyin, tidcnt 0, tidlist %llx\n", 199 (unsigned long long) ti->tidlist); 200 /* 201 * Should we treat as success? likely a bug 202 */ 203 ret = -EFAULT; 204 goto done; 205 } 206 tidcnt = dd->ipath_rcvtidcnt; 207 if (cnt >= tidcnt) { 208 /* make sure it all fits in port_tid_pg_list */ 209 dev_info(&dd->pcidev->dev, "Process tried to allocate %u " 210 "TIDs, only trying max (%u)\n", cnt, tidcnt); 211 cnt = tidcnt; 212 } 213 pagep = (struct page **)pd->port_tid_pg_list; 214 tidlist = (u16 *) (&pagep[cnt]); 215 216 memset(tidmap, 0, sizeof(tidmap)); 217 tid = pd->port_tidcursor; 218 /* before decrement; chip actual # */ 219 porttid = pd->port_port * tidcnt; 220 ntids = tidcnt; 221 tidbase = (u64 __iomem *) (((char __iomem *) dd->ipath_kregbase) + 222 dd->ipath_rcvtidbase + 223 porttid * sizeof(*tidbase)); 224 225 ipath_cdbg(VERBOSE, "Port%u %u tids, cursor %u, tidbase %p\n", 226 pd->port_port, cnt, tid, tidbase); 227 228 /* virtual address of first page in transfer */ 229 vaddr = ti->tidvaddr; 230 if (!access_ok(VERIFY_WRITE, (void __user *) vaddr, 231 cnt * PAGE_SIZE)) { 232 ipath_dbg("Fail vaddr %p, %u pages, !access_ok\n", 233 (void *)vaddr, cnt); 234 ret = -EFAULT; 235 goto done; 236 } 237 ret = ipath_get_user_pages(vaddr, cnt, pagep); 238 if (ret) { 239 if (ret == -EBUSY) { 240 ipath_dbg("Failed to lock addr %p, %u pages " 241 "(already locked)\n", 242 (void *) vaddr, cnt); 243 /* 244 * for now, continue, and see what happens but with 245 * the new implementation, this should never happen, 246 * unless perhaps the user has mpin'ed the pages 247 * themselves (something we need to test) 248 */ 249 ret = 0; 250 } else { 251 dev_info(&dd->pcidev->dev, 252 "Failed to lock addr %p, %u pages: " 253 "errno %d\n", (void *) vaddr, cnt, -ret); 254 goto done; 255 } 256 } 257 for (i = 0; i < cnt; i++, vaddr += PAGE_SIZE) { 258 for (; ntids--; tid++) { 259 if (tid == tidcnt) 260 tid = 0; 261 if (!dd->ipath_pageshadow[porttid + tid]) 262 break; 263 } 264 if (ntids < 0) { 265 /* 266 * oops, wrapped all the way through their TIDs, 267 * and didn't have enough free; see comments at 268 * start of routine 269 */ 270 ipath_dbg("Not enough free TIDs for %u pages " 271 "(index %d), failing\n", cnt, i); 272 i--; /* last tidlist[i] not filled in */ 273 ret = -ENOMEM; 274 break; 275 } 276 tidlist[i] = tid; 277 ipath_cdbg(VERBOSE, "Updating idx %u to TID %u, " 278 "vaddr %lx\n", i, tid, vaddr); 279 /* we "know" system pages and TID pages are same size */ 280 dd->ipath_pageshadow[porttid + tid] = pagep[i]; 281 /* 282 * don't need atomic or it's overhead 283 */ 284 __set_bit(tid, tidmap); 285 physaddr = page_to_phys(pagep[i]); 286 ipath_stats.sps_pagelocks++; 287 ipath_cdbg(VERBOSE, 288 "TID %u, vaddr %lx, physaddr %llx pgp %p\n", 289 tid, vaddr, (unsigned long long) physaddr, 290 pagep[i]); 291 dd->ipath_f_put_tid(dd, &tidbase[tid], 1, physaddr); 292 /* 293 * don't check this tid in ipath_portshadow, since we 294 * just filled it in; start with the next one. 295 */ 296 tid++; 297 } 298 299 if (ret) { 300 u32 limit; 301 cleanup: 302 /* jump here if copy out of updated info failed... */ 303 ipath_dbg("After failure (ret=%d), undo %d of %d entries\n", 304 -ret, i, cnt); 305 /* same code that's in ipath_free_tid() */ 306 limit = sizeof(tidmap) * BITS_PER_BYTE; 307 if (limit > tidcnt) 308 /* just in case size changes in future */ 309 limit = tidcnt; 310 tid = find_first_bit((const unsigned long *)tidmap, limit); 311 for (; tid < limit; tid++) { 312 if (!test_bit(tid, tidmap)) 313 continue; 314 if (dd->ipath_pageshadow[porttid + tid]) { 315 ipath_cdbg(VERBOSE, "Freeing TID %u\n", 316 tid); 317 dd->ipath_f_put_tid(dd, &tidbase[tid], 1, 318 dd->ipath_tidinvalid); 319 dd->ipath_pageshadow[porttid + tid] = NULL; 320 ipath_stats.sps_pageunlocks++; 321 } 322 } 323 ipath_release_user_pages(pagep, cnt); 324 } else { 325 /* 326 * Copy the updated array, with ipath_tid's filled in, back 327 * to user. Since we did the copy in already, this "should 328 * never fail" If it does, we have to clean up... 329 */ 330 if (copy_to_user((void __user *) 331 (unsigned long) ti->tidlist, 332 tidlist, cnt * sizeof(*tidlist))) { 333 ret = -EFAULT; 334 goto cleanup; 335 } 336 if (copy_to_user((void __user *) (unsigned long) ti->tidmap, 337 tidmap, sizeof tidmap)) { 338 ret = -EFAULT; 339 goto cleanup; 340 } 341 if (tid == tidcnt) 342 tid = 0; 343 pd->port_tidcursor = tid; 344 } 345 346done: 347 if (ret) 348 ipath_dbg("Failed to map %u TID pages, failing with %d\n", 349 ti->tidcnt, -ret); 350 return ret; 351} 352 353/** 354 * ipath_tid_free - free a port TID 355 * @pd: the port 356 * @ti: the TID info 357 * 358 * right now we are unlocking one page at a time, but since 359 * the intended use of this routine is for a single group of 360 * virtually contiguous pages, that should change to improve 361 * performance. We check that the TID is in range for this port 362 * but otherwise don't check validity; if user has an error and 363 * frees the wrong tid, it's only their own data that can thereby 364 * be corrupted. We do check that the TID was in use, for sanity 365 * We always use our idea of the saved address, not the address that 366 * they pass in to us. 367 */ 368 369static int ipath_tid_free(struct ipath_portdata *pd, 370 const struct ipath_tid_info *ti) 371{ 372 int ret = 0; 373 u32 tid, porttid, cnt, limit, tidcnt; 374 struct ipath_devdata *dd = pd->port_dd; 375 u64 __iomem *tidbase; 376 unsigned long tidmap[8]; 377 378 if (!dd->ipath_pageshadow) { 379 ret = -ENOMEM; 380 goto done; 381 } 382 383 if (copy_from_user(tidmap, (void __user *)(unsigned long)ti->tidmap, 384 sizeof tidmap)) { 385 ret = -EFAULT; 386 goto done; 387 } 388 389 porttid = pd->port_port * dd->ipath_rcvtidcnt; 390 tidbase = (u64 __iomem *) ((char __iomem *)(dd->ipath_kregbase) + 391 dd->ipath_rcvtidbase + 392 porttid * sizeof(*tidbase)); 393 394 tidcnt = dd->ipath_rcvtidcnt; 395 limit = sizeof(tidmap) * BITS_PER_BYTE; 396 if (limit > tidcnt) 397 /* just in case size changes in future */ 398 limit = tidcnt; 399 tid = find_first_bit(tidmap, limit); 400 ipath_cdbg(VERBOSE, "Port%u free %u tids; first bit (max=%d) " 401 "set is %d, porttid %u\n", pd->port_port, ti->tidcnt, 402 limit, tid, porttid); 403 for (cnt = 0; tid < limit; tid++) { 404 /* 405 * small optimization; if we detect a run of 3 or so without 406 * any set, use find_first_bit again. That's mainly to 407 * accelerate the case where we wrapped, so we have some at 408 * the beginning, and some at the end, and a big gap 409 * in the middle. 410 */ 411 if (!test_bit(tid, tidmap)) 412 continue; 413 cnt++; 414 if (dd->ipath_pageshadow[porttid + tid]) { 415 ipath_cdbg(VERBOSE, "PID %u freeing TID %u\n", 416 pd->port_pid, tid); 417 dd->ipath_f_put_tid(dd, &tidbase[tid], 1, 418 dd->ipath_tidinvalid); 419 ipath_release_user_pages( 420 &dd->ipath_pageshadow[porttid + tid], 1); 421 dd->ipath_pageshadow[porttid + tid] = NULL; 422 ipath_stats.sps_pageunlocks++; 423 } else 424 ipath_dbg("Unused tid %u, ignoring\n", tid); 425 } 426 if (cnt != ti->tidcnt) 427 ipath_dbg("passed in tidcnt %d, only %d bits set in map\n", 428 ti->tidcnt, cnt); 429done: 430 if (ret) 431 ipath_dbg("Failed to unmap %u TID pages, failing with %d\n", 432 ti->tidcnt, -ret); 433 return ret; 434} 435 436/** 437 * ipath_set_part_key - set a partition key 438 * @pd: the port 439 * @key: the key 440 * 441 * We can have up to 4 active at a time (other than the default, which is 442 * always allowed). This is somewhat tricky, since multiple ports may set 443 * the same key, so we reference count them, and clean up at exit. All 4 444 * partition keys are packed into a single infinipath register. It's an 445 * error for a process to set the same pkey multiple times. We provide no 446 * mechanism to de-allocate a pkey at this time, we may eventually need to 447 * do that. I've used the atomic operations, and no locking, and only make 448 * a single pass through what's available. This should be more than 449 * adequate for some time. I'll think about spinlocks or the like if and as 450 * it's necessary. 451 */ 452static int ipath_set_part_key(struct ipath_portdata *pd, u16 key) 453{ 454 struct ipath_devdata *dd = pd->port_dd; 455 int i, any = 0, pidx = -1; 456 u16 lkey = key & 0x7FFF; 457 int ret; 458 459 if (lkey == (IPS_DEFAULT_P_KEY & 0x7FFF)) { 460 /* nothing to do; this key always valid */ 461 ret = 0; 462 goto bail; 463 } 464 465 ipath_cdbg(VERBOSE, "p%u try to set pkey %hx, current keys " 466 "%hx:%x %hx:%x %hx:%x %hx:%x\n", 467 pd->port_port, key, dd->ipath_pkeys[0], 468 atomic_read(&dd->ipath_pkeyrefs[0]), dd->ipath_pkeys[1], 469 atomic_read(&dd->ipath_pkeyrefs[1]), dd->ipath_pkeys[2], 470 atomic_read(&dd->ipath_pkeyrefs[2]), dd->ipath_pkeys[3], 471 atomic_read(&dd->ipath_pkeyrefs[3])); 472 473 if (!lkey) { 474 ipath_cdbg(PROC, "p%u tries to set key 0, not allowed\n", 475 pd->port_port); 476 ret = -EINVAL; 477 goto bail; 478 } 479 480 /* 481 * Set the full membership bit, because it has to be 482 * set in the register or the packet, and it seems 483 * cleaner to set in the register than to force all 484 * callers to set it. (see bug 4331) 485 */ 486 key |= 0x8000; 487 488 for (i = 0; i < ARRAY_SIZE(pd->port_pkeys); i++) { 489 if (!pd->port_pkeys[i] && pidx == -1) 490 pidx = i; 491 if (pd->port_pkeys[i] == key) { 492 ipath_cdbg(VERBOSE, "p%u tries to set same pkey " 493 "(%x) more than once\n", 494 pd->port_port, key); 495 ret = -EEXIST; 496 goto bail; 497 } 498 } 499 if (pidx == -1) { 500 ipath_dbg("All pkeys for port %u already in use, " 501 "can't set %x\n", pd->port_port, key); 502 ret = -EBUSY; 503 goto bail; 504 } 505 for (any = i = 0; i < ARRAY_SIZE(dd->ipath_pkeys); i++) { 506 if (!dd->ipath_pkeys[i]) { 507 any++; 508 continue; 509 } 510 if (dd->ipath_pkeys[i] == key) { 511 atomic_t *pkrefs = &dd->ipath_pkeyrefs[i]; 512 513 if (atomic_inc_return(pkrefs) > 1) { 514 pd->port_pkeys[pidx] = key; 515 ipath_cdbg(VERBOSE, "p%u set key %x " 516 "matches #%d, count now %d\n", 517 pd->port_port, key, i, 518 atomic_read(pkrefs)); 519 ret = 0; 520 goto bail; 521 } else { 522 /* 523 * lost race, decrement count, catch below 524 */ 525 atomic_dec(pkrefs); 526 ipath_cdbg(VERBOSE, "Lost race, count was " 527 "0, after dec, it's %d\n", 528 atomic_read(pkrefs)); 529 any++; 530 } 531 } 532 if ((dd->ipath_pkeys[i] & 0x7FFF) == lkey) { 533 /* 534 * It makes no sense to have both the limited and 535 * full membership PKEY set at the same time since 536 * the unlimited one will disable the limited one. 537 */ 538 ret = -EEXIST; 539 goto bail; 540 } 541 } 542 if (!any) { 543 ipath_dbg("port %u, all pkeys already in use, " 544 "can't set %x\n", pd->port_port, key); 545 ret = -EBUSY; 546 goto bail; 547 } 548 for (any = i = 0; i < ARRAY_SIZE(dd->ipath_pkeys); i++) { 549 if (!dd->ipath_pkeys[i] && 550 atomic_inc_return(&dd->ipath_pkeyrefs[i]) == 1) { 551 u64 pkey; 552 553 /* for ipathstats, etc. */ 554 ipath_stats.sps_pkeys[i] = lkey; 555 pd->port_pkeys[pidx] = dd->ipath_pkeys[i] = key; 556 pkey = 557 (u64) dd->ipath_pkeys[0] | 558 ((u64) dd->ipath_pkeys[1] << 16) | 559 ((u64) dd->ipath_pkeys[2] << 32) | 560 ((u64) dd->ipath_pkeys[3] << 48); 561 ipath_cdbg(PROC, "p%u set key %x in #%d, " 562 "portidx %d, new pkey reg %llx\n", 563 pd->port_port, key, i, pidx, 564 (unsigned long long) pkey); 565 ipath_write_kreg( 566 dd, dd->ipath_kregs->kr_partitionkey, pkey); 567 568 ret = 0; 569 goto bail; 570 } 571 } 572 ipath_dbg("port %u, all pkeys already in use 2nd pass, " 573 "can't set %x\n", pd->port_port, key); 574 ret = -EBUSY; 575 576bail: 577 return ret; 578} 579 580/** 581 * ipath_manage_rcvq - manage a port's receive queue 582 * @pd: the port 583 * @start_stop: action to carry out 584 * 585 * start_stop == 0 disables receive on the port, for use in queue 586 * overflow conditions. start_stop==1 re-enables, to be used to 587 * re-init the software copy of the head register 588 */ 589static int ipath_manage_rcvq(struct ipath_portdata *pd, int start_stop) 590{ 591 struct ipath_devdata *dd = pd->port_dd; 592 u64 tval; 593 594 ipath_cdbg(PROC, "%sabling rcv for unit %u port %u\n", 595 start_stop ? "en" : "dis", dd->ipath_unit, 596 pd->port_port); 597 /* atomically clear receive enable port. */ 598 if (start_stop) { 599 /* 600 * On enable, force in-memory copy of the tail register to 601 * 0, so that protocol code doesn't have to worry about 602 * whether or not the chip has yet updated the in-memory 603 * copy or not on return from the system call. The chip 604 * always resets it's tail register back to 0 on a 605 * transition from disabled to enabled. This could cause a 606 * problem if software was broken, and did the enable w/o 607 * the disable, but eventually the in-memory copy will be 608 * updated and correct itself, even in the face of software 609 * bugs. 610 */ 611 *pd->port_rcvhdrtail_kvaddr = 0; 612 set_bit(INFINIPATH_R_PORTENABLE_SHIFT + pd->port_port, 613 &dd->ipath_rcvctrl); 614 } else 615 clear_bit(INFINIPATH_R_PORTENABLE_SHIFT + pd->port_port, 616 &dd->ipath_rcvctrl); 617 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl, 618 dd->ipath_rcvctrl); 619 /* now be sure chip saw it before we return */ 620 tval = ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch); 621 if (start_stop) { 622 /* 623 * And try to be sure that tail reg update has happened too. 624 * This should in theory interlock with the RXE changes to 625 * the tail register. Don't assign it to the tail register 626 * in memory copy, since we could overwrite an update by the 627 * chip if we did. 628 */ 629 tval = ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port); 630 } 631 /* always; new head should be equal to new tail; see above */ 632 return 0; 633} 634 635static void ipath_clean_part_key(struct ipath_portdata *pd, 636 struct ipath_devdata *dd) 637{ 638 int i, j, pchanged = 0; 639 u64 oldpkey; 640 641 /* for debugging only */ 642 oldpkey = (u64) dd->ipath_pkeys[0] | 643 ((u64) dd->ipath_pkeys[1] << 16) | 644 ((u64) dd->ipath_pkeys[2] << 32) | 645 ((u64) dd->ipath_pkeys[3] << 48); 646 647 for (i = 0; i < ARRAY_SIZE(pd->port_pkeys); i++) { 648 if (!pd->port_pkeys[i]) 649 continue; 650 ipath_cdbg(VERBOSE, "look for key[%d] %hx in pkeys\n", i, 651 pd->port_pkeys[i]); 652 for (j = 0; j < ARRAY_SIZE(dd->ipath_pkeys); j++) { 653 /* check for match independent of the global bit */ 654 if ((dd->ipath_pkeys[j] & 0x7fff) != 655 (pd->port_pkeys[i] & 0x7fff)) 656 continue; 657 if (atomic_dec_and_test(&dd->ipath_pkeyrefs[j])) { 658 ipath_cdbg(VERBOSE, "p%u clear key " 659 "%x matches #%d\n", 660 pd->port_port, 661 pd->port_pkeys[i], j); 662 ipath_stats.sps_pkeys[j] = 663 dd->ipath_pkeys[j] = 0; 664 pchanged++; 665 } 666 else ipath_cdbg( 667 VERBOSE, "p%u key %x matches #%d, " 668 "but ref still %d\n", pd->port_port, 669 pd->port_pkeys[i], j, 670 atomic_read(&dd->ipath_pkeyrefs[j])); 671 break; 672 } 673 pd->port_pkeys[i] = 0; 674 } 675 if (pchanged) { 676 u64 pkey = (u64) dd->ipath_pkeys[0] | 677 ((u64) dd->ipath_pkeys[1] << 16) | 678 ((u64) dd->ipath_pkeys[2] << 32) | 679 ((u64) dd->ipath_pkeys[3] << 48); 680 ipath_cdbg(VERBOSE, "p%u old pkey reg %llx, " 681 "new pkey reg %llx\n", pd->port_port, 682 (unsigned long long) oldpkey, 683 (unsigned long long) pkey); 684 ipath_write_kreg(dd, dd->ipath_kregs->kr_partitionkey, 685 pkey); 686 } 687} 688 689/** 690 * ipath_create_user_egr - allocate eager TID buffers 691 * @pd: the port to allocate TID buffers for 692 * 693 * This routine is now quite different for user and kernel, because 694 * the kernel uses skb's, for the accelerated network performance 695 * This is the user port version 696 * 697 * Allocate the eager TID buffers and program them into infinipath 698 * They are no longer completely contiguous, we do multiple allocation 699 * calls. 700 */ 701static int ipath_create_user_egr(struct ipath_portdata *pd) 702{ 703 struct ipath_devdata *dd = pd->port_dd; 704 unsigned e, egrcnt, alloced, egrperchunk, chunk, egrsize, egroff; 705 size_t size; 706 int ret; 707 708 egrcnt = dd->ipath_rcvegrcnt; 709 /* TID number offset for this port */ 710 egroff = pd->port_port * egrcnt; 711 egrsize = dd->ipath_rcvegrbufsize; 712 ipath_cdbg(VERBOSE, "Allocating %d egr buffers, at egrtid " 713 "offset %x, egrsize %u\n", egrcnt, egroff, egrsize); 714 715 /* 716 * to avoid wasting a lot of memory, we allocate 32KB chunks of 717 * physically contiguous memory, advance through it until used up 718 * and then allocate more. Of course, we need memory to store those 719 * extra pointers, now. Started out with 256KB, but under heavy 720 * memory pressure (creating large files and then copying them over 721 * NFS while doing lots of MPI jobs), we hit some allocation 722 * failures, even though we can sleep... (2.6.10) Still get 723 * failures at 64K. 32K is the lowest we can go without waiting 724 * more memory again. It seems likely that the coalescing in 725 * free_pages, etc. still has issues (as it has had previously 726 * during 2.6.x development). 727 */ 728 size = 0x8000; 729 alloced = ALIGN(egrsize * egrcnt, size); 730 egrperchunk = size / egrsize; 731 chunk = (egrcnt + egrperchunk - 1) / egrperchunk; 732 pd->port_rcvegrbuf_chunks = chunk; 733 pd->port_rcvegrbufs_perchunk = egrperchunk; 734 pd->port_rcvegrbuf_size = size; 735 pd->port_rcvegrbuf = vmalloc(chunk * sizeof(pd->port_rcvegrbuf[0])); 736 if (!pd->port_rcvegrbuf) { 737 ret = -ENOMEM; 738 goto bail; 739 } 740 pd->port_rcvegrbuf_phys = 741 vmalloc(chunk * sizeof(pd->port_rcvegrbuf_phys[0])); 742 if (!pd->port_rcvegrbuf_phys) { 743 ret = -ENOMEM; 744 goto bail_rcvegrbuf; 745 } 746 for (e = 0; e < pd->port_rcvegrbuf_chunks; e++) { 747 /* 748 * GFP_USER, but without GFP_FS, so buffer cache can be 749 * coalesced (we hope); otherwise, even at order 4, 750 * heavy filesystem activity makes these fail 751 */ 752 gfp_t gfp_flags = __GFP_WAIT | __GFP_IO | __GFP_COMP; 753 754 pd->port_rcvegrbuf[e] = dma_alloc_coherent( 755 &dd->pcidev->dev, size, &pd->port_rcvegrbuf_phys[e], 756 gfp_flags); 757 758 if (!pd->port_rcvegrbuf[e]) { 759 ret = -ENOMEM; 760 goto bail_rcvegrbuf_phys; 761 } 762 } 763 764 pd->port_rcvegr_phys = pd->port_rcvegrbuf_phys[0]; 765 766 for (e = chunk = 0; chunk < pd->port_rcvegrbuf_chunks; chunk++) { 767 dma_addr_t pa = pd->port_rcvegrbuf_phys[chunk]; 768 unsigned i; 769 770 for (i = 0; e < egrcnt && i < egrperchunk; e++, i++) { 771 dd->ipath_f_put_tid(dd, e + egroff + 772 (u64 __iomem *) 773 ((char __iomem *) 774 dd->ipath_kregbase + 775 dd->ipath_rcvegrbase), 0, pa); 776 pa += egrsize; 777 } 778 cond_resched(); /* don't hog the cpu */ 779 } 780 781 ret = 0; 782 goto bail; 783 784bail_rcvegrbuf_phys: 785 for (e = 0; e < pd->port_rcvegrbuf_chunks && 786 pd->port_rcvegrbuf[e]; e++) 787 dma_free_coherent(&dd->pcidev->dev, size, 788 pd->port_rcvegrbuf[e], 789 pd->port_rcvegrbuf_phys[e]); 790 791 vfree(pd->port_rcvegrbuf_phys); 792 pd->port_rcvegrbuf_phys = NULL; 793bail_rcvegrbuf: 794 vfree(pd->port_rcvegrbuf); 795 pd->port_rcvegrbuf = NULL; 796bail: 797 return ret; 798} 799 800static int ipath_do_user_init(struct ipath_portdata *pd, 801 const struct ipath_user_info *uinfo) 802{ 803 int ret = 0; 804 struct ipath_devdata *dd = pd->port_dd; 805 u64 physaddr, uaddr, off, atmp; 806 struct page *pagep; 807 u32 head32; 808 u64 head; 809 810 /* for now, if major version is different, bail */ 811 if ((uinfo->spu_userversion >> 16) != IPATH_USER_SWMAJOR) { 812 dev_info(&dd->pcidev->dev, 813 "User major version %d not same as driver " 814 "major %d\n", uinfo->spu_userversion >> 16, 815 IPATH_USER_SWMAJOR); 816 ret = -ENODEV; 817 goto done; 818 } 819 820 if ((uinfo->spu_userversion & 0xffff) != IPATH_USER_SWMINOR) 821 ipath_dbg("User minor version %d not same as driver " 822 "minor %d\n", uinfo->spu_userversion & 0xffff, 823 IPATH_USER_SWMINOR); 824 825 if (uinfo->spu_rcvhdrsize) { 826 ret = ipath_setrcvhdrsize(dd, uinfo->spu_rcvhdrsize); 827 if (ret) 828 goto done; 829 } 830 831 /* for now we do nothing with rcvhdrcnt: uinfo->spu_rcvhdrcnt */ 832 833 /* set up for the rcvhdr Q tail register writeback to user memory */ 834 if (!uinfo->spu_rcvhdraddr || 835 !access_ok(VERIFY_WRITE, (u64 __user *) (unsigned long) 836 uinfo->spu_rcvhdraddr, sizeof(u64))) { 837 ipath_dbg("Port %d rcvhdrtail addr %llx not valid\n", 838 pd->port_port, 839 (unsigned long long) uinfo->spu_rcvhdraddr); 840 ret = -EINVAL; 841 goto done; 842 } 843 844 off = offset_in_page(uinfo->spu_rcvhdraddr); 845 uaddr = PAGE_MASK & (unsigned long) uinfo->spu_rcvhdraddr; 846 ret = ipath_get_user_pages_nocopy(uaddr, &pagep); 847 if (ret) { 848 dev_info(&dd->pcidev->dev, "Failed to lookup and lock " 849 "address %llx for rcvhdrtail: errno %d\n", 850 (unsigned long long) uinfo->spu_rcvhdraddr, -ret); 851 goto done; 852 } 853 ipath_stats.sps_pagelocks++; 854 pd->port_rcvhdrtail_uaddr = uaddr; 855 pd->port_rcvhdrtail_pagep = pagep; 856 pd->port_rcvhdrtail_kvaddr = 857 page_address(pagep); 858 pd->port_rcvhdrtail_kvaddr += off; 859 physaddr = page_to_phys(pagep) + off; 860 ipath_cdbg(VERBOSE, "port %d user addr %llx hdrtailaddr, %llx " 861 "physical (off=%llx)\n", 862 pd->port_port, 863 (unsigned long long) uinfo->spu_rcvhdraddr, 864 (unsigned long long) physaddr, (unsigned long long) off); 865 ipath_write_kreg_port(dd, dd->ipath_kregs->kr_rcvhdrtailaddr, 866 pd->port_port, physaddr); 867 atmp = ipath_read_kreg64_port(dd, 868 dd->ipath_kregs->kr_rcvhdrtailaddr, 869 pd->port_port); 870 if (physaddr != atmp) { 871 ipath_dev_err(dd, 872 "Catastrophic software error, " 873 "RcvHdrTailAddr%u written as %llx, " 874 "read back as %llx\n", pd->port_port, 875 (unsigned long long) physaddr, 876 (unsigned long long) atmp); 877 ret = -EINVAL; 878 goto done; 879 } 880 881 /* for right now, kernel piobufs are at end, so port 1 is at 0 */ 882 pd->port_piobufs = dd->ipath_piobufbase + 883 dd->ipath_pbufsport * (pd->port_port - 884 1) * dd->ipath_palign; 885 ipath_cdbg(VERBOSE, "Set base of piobufs for port %u to 0x%x\n", 886 pd->port_port, pd->port_piobufs); 887 888 /* 889 * Now allocate the rcvhdr Q and eager TIDs; skip the TID 890 * array for time being. If pd->port_port > chip-supported, 891 * we need to do extra stuff here to handle by handling overflow 892 * through port 0, someday 893 */ 894 ret = ipath_create_rcvhdrq(dd, pd); 895 if (!ret) 896 ret = ipath_create_user_egr(pd); 897 if (ret) 898 goto done; 899 /* enable receives now */ 900 /* atomically set enable bit for this port */ 901 set_bit(INFINIPATH_R_PORTENABLE_SHIFT + pd->port_port, 902 &dd->ipath_rcvctrl); 903 904 /* 905 * set the head registers for this port to the current values 906 * of the tail pointers, since we don't know if they were 907 * updated on last use of the port. 908 */ 909 head32 = ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port); 910 head = (u64) head32; 911 ipath_write_ureg(dd, ur_rcvhdrhead, head, pd->port_port); 912 head32 = ipath_read_ureg32(dd, ur_rcvegrindextail, pd->port_port); 913 ipath_write_ureg(dd, ur_rcvegrindexhead, head32, pd->port_port); 914 dd->ipath_lastegrheads[pd->port_port] = -1; 915 dd->ipath_lastrcvhdrqtails[pd->port_port] = -1; 916 ipath_cdbg(VERBOSE, "Wrote port%d head %llx, egrhead %x from " 917 "tail regs\n", pd->port_port, 918 (unsigned long long) head, head32); 919 pd->port_tidcursor = 0; /* start at beginning after open */ 920 /* 921 * now enable the port; the tail registers will be written to memory 922 * by the chip as soon as it sees the write to 923 * dd->ipath_kregs->kr_rcvctrl. The update only happens on 924 * transition from 0 to 1, so clear it first, then set it as part of 925 * enabling the port. This will (very briefly) affect any other 926 * open ports, but it shouldn't be long enough to be an issue. 927 */ 928 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl, 929 dd->ipath_rcvctrl & ~INFINIPATH_R_TAILUPD); 930 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl, 931 dd->ipath_rcvctrl); 932 933done: 934 return ret; 935} 936 937static int mmap_ureg(struct vm_area_struct *vma, struct ipath_devdata *dd, 938 u64 ureg) 939{ 940 unsigned long phys; 941 int ret; 942 943 /* it's the real hardware, so io_remap works */ 944 945 if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) { 946 dev_info(&dd->pcidev->dev, "FAIL mmap userreg: reqlen " 947 "%lx > PAGE\n", vma->vm_end - vma->vm_start); 948 ret = -EFAULT; 949 } else { 950 phys = dd->ipath_physaddr + ureg; 951 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 952 953 vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND; 954 ret = io_remap_pfn_range(vma, vma->vm_start, 955 phys >> PAGE_SHIFT, 956 vma->vm_end - vma->vm_start, 957 vma->vm_page_prot); 958 } 959 return ret; 960} 961 962static int mmap_piobufs(struct vm_area_struct *vma, 963 struct ipath_devdata *dd, 964 struct ipath_portdata *pd) 965{ 966 unsigned long phys; 967 int ret; 968 969 /* 970 * When we map the PIO buffers, we want to map them as writeonly, no 971 * read possible. 972 */ 973 974 if ((vma->vm_end - vma->vm_start) > 975 (dd->ipath_pbufsport * dd->ipath_palign)) { 976 dev_info(&dd->pcidev->dev, "FAIL mmap piobufs: " 977 "reqlen %lx > PAGE\n", 978 vma->vm_end - vma->vm_start); 979 ret = -EFAULT; 980 goto bail; 981 } 982 983 phys = dd->ipath_physaddr + pd->port_piobufs; 984 /* 985 * Do *NOT* mark this as non-cached (PWT bit), or we don't get the 986 * write combining behavior we want on the PIO buffers! 987 * vma->vm_page_prot = 988 * pgprot_noncached(vma->vm_page_prot); 989 */ 990 991 if (vma->vm_flags & VM_READ) { 992 dev_info(&dd->pcidev->dev, 993 "Can't map piobufs as readable (flags=%lx)\n", 994 vma->vm_flags); 995 ret = -EPERM; 996 goto bail; 997 } 998 999 /* don't allow them to later change to readable with mprotect */ 1000 1001 vma->vm_flags &= ~VM_MAYWRITE; 1002 vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND; 1003 1004 ret = io_remap_pfn_range(vma, vma->vm_start, phys >> PAGE_SHIFT, 1005 vma->vm_end - vma->vm_start, 1006 vma->vm_page_prot); 1007bail: 1008 return ret; 1009} 1010 1011static int mmap_rcvegrbufs(struct vm_area_struct *vma, 1012 struct ipath_portdata *pd) 1013{ 1014 struct ipath_devdata *dd = pd->port_dd; 1015 unsigned long start, size; 1016 size_t total_size, i; 1017 dma_addr_t *phys; 1018 int ret; 1019 1020 if (!pd->port_rcvegrbuf) { 1021 ret = -EFAULT; 1022 goto bail; 1023 } 1024 1025 size = pd->port_rcvegrbuf_size; 1026 total_size = pd->port_rcvegrbuf_chunks * size; 1027 if ((vma->vm_end - vma->vm_start) > total_size) { 1028 dev_info(&dd->pcidev->dev, "FAIL on egr bufs: " 1029 "reqlen %lx > actual %lx\n", 1030 vma->vm_end - vma->vm_start, 1031 (unsigned long) total_size); 1032 ret = -EFAULT; 1033 goto bail; 1034 } 1035 1036 if (vma->vm_flags & VM_WRITE) { 1037 dev_info(&dd->pcidev->dev, "Can't map eager buffers as " 1038 "writable (flags=%lx)\n", vma->vm_flags); 1039 ret = -EPERM; 1040 goto bail; 1041 } 1042 1043 start = vma->vm_start; 1044 phys = pd->port_rcvegrbuf_phys; 1045 1046 /* don't allow them to later change to writeable with mprotect */ 1047 vma->vm_flags &= ~VM_MAYWRITE; 1048 1049 for (i = 0; i < pd->port_rcvegrbuf_chunks; i++, start += size) { 1050 ret = remap_pfn_range(vma, start, phys[i] >> PAGE_SHIFT, 1051 size, vma->vm_page_prot); 1052 if (ret < 0) 1053 goto bail; 1054 } 1055 ret = 0; 1056 1057bail: 1058 return ret; 1059} 1060 1061static int mmap_rcvhdrq(struct vm_area_struct *vma, 1062 struct ipath_portdata *pd) 1063{ 1064 struct ipath_devdata *dd = pd->port_dd; 1065 size_t total_size; 1066 int ret; 1067 1068 /* 1069 * kmalloc'ed memory, physically contiguous; this is from 1070 * spi_rcvhdr_base; we allow user to map read-write so they can 1071 * write hdrq entries to allow protocol code to directly poll 1072 * whether a hdrq entry has been written. 1073 */ 1074 total_size = ALIGN(dd->ipath_rcvhdrcnt * dd->ipath_rcvhdrentsize * 1075 sizeof(u32), PAGE_SIZE); 1076 if ((vma->vm_end - vma->vm_start) > total_size) { 1077 dev_info(&dd->pcidev->dev, 1078 "FAIL on rcvhdrq: reqlen %lx > actual %lx\n", 1079 vma->vm_end - vma->vm_start, 1080 (unsigned long) total_size); 1081 ret = -EFAULT; 1082 goto bail; 1083 } 1084 1085 ret = remap_pfn_range(vma, vma->vm_start, 1086 pd->port_rcvhdrq_phys >> PAGE_SHIFT, 1087 vma->vm_end - vma->vm_start, 1088 vma->vm_page_prot); 1089bail: 1090 return ret; 1091} 1092 1093static int mmap_pioavailregs(struct vm_area_struct *vma, 1094 struct ipath_portdata *pd) 1095{ 1096 struct ipath_devdata *dd = pd->port_dd; 1097 int ret; 1098 1099 /* 1100 * when we map the PIO bufferavail registers, we want to map them as 1101 * readonly, no write possible. 1102 * 1103 * kmalloc'ed memory, physically contiguous, one page only, readonly 1104 */ 1105 1106 if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) { 1107 dev_info(&dd->pcidev->dev, "FAIL on pioavailregs_dma: " 1108 "reqlen %lx > actual %lx\n", 1109 vma->vm_end - vma->vm_start, 1110 (unsigned long) PAGE_SIZE); 1111 ret = -EFAULT; 1112 goto bail; 1113 } 1114 1115 if (vma->vm_flags & VM_WRITE) { 1116 dev_info(&dd->pcidev->dev, 1117 "Can't map pioavailregs as writable (flags=%lx)\n", 1118 vma->vm_flags); 1119 ret = -EPERM; 1120 goto bail; 1121 } 1122 1123 /* don't allow them to later change with mprotect */ 1124 vma->vm_flags &= ~VM_MAYWRITE; 1125 1126 ret = remap_pfn_range(vma, vma->vm_start, 1127 dd->ipath_pioavailregs_phys >> PAGE_SHIFT, 1128 PAGE_SIZE, vma->vm_page_prot); 1129bail: 1130 return ret; 1131} 1132 1133/** 1134 * ipath_mmap - mmap various structures into user space 1135 * @fp: the file pointer 1136 * @vma: the VM area 1137 * 1138 * We use this to have a shared buffer between the kernel and the user code 1139 * for the rcvhdr queue, egr buffers, and the per-port user regs and pio 1140 * buffers in the chip. We have the open and close entries so we can bump 1141 * the ref count and keep the driver from being unloaded while still mapped. 1142 */ 1143static int ipath_mmap(struct file *fp, struct vm_area_struct *vma) 1144{ 1145 struct ipath_portdata *pd; 1146 struct ipath_devdata *dd; 1147 u64 pgaddr, ureg; 1148 int ret; 1149 1150 pd = port_fp(fp); 1151 dd = pd->port_dd; 1152 /* 1153 * This is the ipath_do_user_init() code, mapping the shared buffers 1154 * into the user process. The address referred to by vm_pgoff is the 1155 * virtual, not physical, address; we only do one mmap for each 1156 * space mapped. 1157 */ 1158 pgaddr = vma->vm_pgoff << PAGE_SHIFT; 1159 1160 /* 1161 * note that ureg does *NOT* have the kregvirt as part of it, to be 1162 * sure that for 32 bit programs, we don't end up trying to map a > 1163 * 44 address. Has to match ipath_get_base_info() code that sets 1164 * __spi_uregbase 1165 */ 1166 1167 ureg = dd->ipath_uregbase + dd->ipath_palign * pd->port_port; 1168 1169 ipath_cdbg(MM, "ushare: pgaddr %llx vm_start=%lx, vmlen %lx\n", 1170 (unsigned long long) pgaddr, vma->vm_start, 1171 vma->vm_end - vma->vm_start); 1172 1173 if (pgaddr == ureg) 1174 ret = mmap_ureg(vma, dd, ureg); 1175 else if (pgaddr == pd->port_piobufs) 1176 ret = mmap_piobufs(vma, dd, pd); 1177 else if (pgaddr == (u64) pd->port_rcvegr_phys) 1178 ret = mmap_rcvegrbufs(vma, pd); 1179 else if (pgaddr == (u64) pd->port_rcvhdrq_phys) 1180 ret = mmap_rcvhdrq(vma, pd); 1181 else if (pgaddr == dd->ipath_pioavailregs_phys) 1182 ret = mmap_pioavailregs(vma, pd); 1183 else 1184 ret = -EINVAL; 1185 1186 vma->vm_private_data = NULL; 1187 1188 if (ret < 0) 1189 dev_info(&dd->pcidev->dev, 1190 "Failure %d on addr %lx, off %lx\n", 1191 -ret, vma->vm_start, vma->vm_pgoff); 1192 1193 return ret; 1194} 1195 1196static unsigned int ipath_poll(struct file *fp, 1197 struct poll_table_struct *pt) 1198{ 1199 struct ipath_portdata *pd; 1200 u32 head, tail; 1201 int bit; 1202 struct ipath_devdata *dd; 1203 1204 pd = port_fp(fp); 1205 dd = pd->port_dd; 1206 1207 bit = pd->port_port + INFINIPATH_R_INTRAVAIL_SHIFT; 1208 set_bit(bit, &dd->ipath_rcvctrl); 1209 1210 /* 1211 * Before blocking, make sure that head is still == tail, 1212 * reading from the chip, so we can be sure the interrupt 1213 * enable has made it to the chip. If not equal, disable 1214 * interrupt again and return immediately. This avoids races, 1215 * and the overhead of the chip read doesn't matter much at 1216 * this point, since we are waiting for something anyway. 1217 */ 1218 1219 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl, 1220 dd->ipath_rcvctrl); 1221 1222 head = ipath_read_ureg32(dd, ur_rcvhdrhead, pd->port_port); 1223 tail = ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port); 1224 1225 if (tail == head) { 1226 set_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag); 1227 poll_wait(fp, &pd->port_wait, pt); 1228 1229 if (test_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag)) { 1230 /* timed out, no packets received */ 1231 clear_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag); 1232 pd->port_rcvwait_to++; 1233 } 1234 } 1235 else { 1236 /* it's already happened; don't do wait_event overhead */ 1237 pd->port_rcvnowait++; 1238 } 1239 1240 clear_bit(bit, &dd->ipath_rcvctrl); 1241 ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl, 1242 dd->ipath_rcvctrl); 1243 1244 return 0; 1245} 1246 1247static int try_alloc_port(struct ipath_devdata *dd, int port, 1248 struct file *fp) 1249{ 1250 int ret; 1251 1252 if (!dd->ipath_pd[port]) { 1253 void *p, *ptmp; 1254 1255 p = kzalloc(sizeof(struct ipath_portdata), GFP_KERNEL); 1256 1257 /* 1258 * Allocate memory for use in ipath_tid_update() just once 1259 * at open, not per call. Reduces cost of expected send 1260 * setup. 1261 */ 1262 ptmp = kmalloc(dd->ipath_rcvtidcnt * sizeof(u16) + 1263 dd->ipath_rcvtidcnt * sizeof(struct page **), 1264 GFP_KERNEL); 1265 if (!p || !ptmp) { 1266 ipath_dev_err(dd, "Unable to allocate portdata " 1267 "memory, failing open\n"); 1268 ret = -ENOMEM; 1269 kfree(p); 1270 kfree(ptmp); 1271 goto bail; 1272 } 1273 dd->ipath_pd[port] = p; 1274 dd->ipath_pd[port]->port_port = port; 1275 dd->ipath_pd[port]->port_dd = dd; 1276 dd->ipath_pd[port]->port_tid_pg_list = ptmp; 1277 init_waitqueue_head(&dd->ipath_pd[port]->port_wait); 1278 } 1279 if (!dd->ipath_pd[port]->port_cnt) { 1280 dd->ipath_pd[port]->port_cnt = 1; 1281 fp->private_data = (void *) dd->ipath_pd[port]; 1282 ipath_cdbg(PROC, "%s[%u] opened unit:port %u:%u\n", 1283 current->comm, current->pid, dd->ipath_unit, 1284 port); 1285 dd->ipath_pd[port]->port_pid = current->pid; 1286 strncpy(dd->ipath_pd[port]->port_comm, current->comm, 1287 sizeof(dd->ipath_pd[port]->port_comm)); 1288 ipath_stats.sps_ports++; 1289 ret = 0; 1290 goto bail; 1291 } 1292 ret = -EBUSY; 1293 1294bail: 1295 return ret; 1296} 1297 1298static inline int usable(struct ipath_devdata *dd) 1299{ 1300 return dd && 1301 (dd->ipath_flags & IPATH_PRESENT) && 1302 dd->ipath_kregbase && 1303 dd->ipath_lid && 1304 !(dd->ipath_flags & (IPATH_LINKDOWN | IPATH_DISABLED 1305 | IPATH_LINKUNK)); 1306} 1307 1308static int find_free_port(int unit, struct file *fp) 1309{ 1310 struct ipath_devdata *dd = ipath_lookup(unit); 1311 int ret, i; 1312 1313 if (!dd) { 1314 ret = -ENODEV; 1315 goto bail; 1316 } 1317 1318 if (!usable(dd)) { 1319 ret = -ENETDOWN; 1320 goto bail; 1321 } 1322 1323 for (i = 0; i < dd->ipath_cfgports; i++) { 1324 ret = try_alloc_port(dd, i, fp); 1325 if (ret != -EBUSY) 1326 goto bail; 1327 } 1328 ret = -EBUSY; 1329 1330bail: 1331 return ret; 1332} 1333 1334static int find_best_unit(struct file *fp) 1335{ 1336 int ret = 0, i, prefunit = -1, devmax; 1337 int maxofallports, npresent, nup; 1338 int ndev; 1339 1340 (void) ipath_count_units(&npresent, &nup, &maxofallports); 1341 1342 /* 1343 * This code is present to allow a knowledgeable person to 1344 * specify the layout of processes to processors before opening 1345 * this driver, and then we'll assign the process to the "closest" 1346 * HT-400 to that processor (we assume reasonable connectivity, 1347 * for now). This code assumes that if affinity has been set 1348 * before this point, that at most one cpu is set; for now this 1349 * is reasonable. I check for both cpus_empty() and cpus_full(), 1350 * in case some kernel variant sets none of the bits when no 1351 * affinity is set. 2.6.11 and 12 kernels have all present 1352 * cpus set. Some day we'll have to fix it up further to handle 1353 * a cpu subset. This algorithm fails for two HT-400's connected 1354 * in tunnel fashion. Eventually this needs real topology 1355 * information. There may be some issues with dual core numbering 1356 * as well. This needs more work prior to release. 1357 */ 1358 if (!cpus_empty(current->cpus_allowed) && 1359 !cpus_full(current->cpus_allowed)) { 1360 int ncpus = num_online_cpus(), curcpu = -1; 1361 for (i = 0; i < ncpus; i++) 1362 if (cpu_isset(i, current->cpus_allowed)) { 1363 ipath_cdbg(PROC, "%s[%u] affinity set for " 1364 "cpu %d\n", current->comm, 1365 current->pid, i); 1366 curcpu = i; 1367 } 1368 if (curcpu != -1) { 1369 if (npresent) { 1370 prefunit = curcpu / (ncpus / npresent); 1371 ipath_dbg("%s[%u] %d chips, %d cpus, " 1372 "%d cpus/chip, select unit %d\n", 1373 current->comm, current->pid, 1374 npresent, ncpus, ncpus / npresent, 1375 prefunit); 1376 } 1377 } 1378 } 1379 1380 /* 1381 * user ports start at 1, kernel port is 0 1382 * For now, we do round-robin access across all chips 1383 */ 1384 1385 if (prefunit != -1) 1386 devmax = prefunit + 1; 1387 else 1388 devmax = ipath_count_units(NULL, NULL, NULL); 1389recheck: 1390 for (i = 1; i < maxofallports; i++) { 1391 for (ndev = prefunit != -1 ? prefunit : 0; ndev < devmax; 1392 ndev++) { 1393 struct ipath_devdata *dd = ipath_lookup(ndev); 1394 1395 if (!usable(dd)) 1396 continue; /* can't use this unit */ 1397 if (i >= dd->ipath_cfgports) 1398 /* 1399 * Maxed out on users of this unit. Try 1400 * next. 1401 */ 1402 continue; 1403 ret = try_alloc_port(dd, i, fp); 1404 if (!ret) 1405 goto done; 1406 } 1407 } 1408 1409 if (npresent) { 1410 if (nup == 0) { 1411 ret = -ENETDOWN; 1412 ipath_dbg("No ports available (none initialized " 1413 "and ready)\n"); 1414 } else { 1415 if (prefunit > 0) { 1416 /* if started above 0, retry from 0 */ 1417 ipath_cdbg(PROC, 1418 "%s[%u] no ports on prefunit " 1419 "%d, clear and re-check\n", 1420 current->comm, current->pid, 1421 prefunit); 1422 devmax = ipath_count_units(NULL, NULL, 1423 NULL); 1424 prefunit = -1; 1425 goto recheck; 1426 } 1427 ret = -EBUSY; 1428 ipath_dbg("No ports available\n"); 1429 } 1430 } else { 1431 ret = -ENXIO; 1432 ipath_dbg("No boards found\n"); 1433 } 1434 1435done: 1436 return ret; 1437} 1438 1439static int ipath_open(struct inode *in, struct file *fp) 1440{ 1441 int ret, minor; 1442 1443 mutex_lock(&ipath_mutex); 1444 1445 minor = iminor(in); 1446 ipath_cdbg(VERBOSE, "open on dev %lx (minor %d)\n", 1447 (long)in->i_rdev, minor); 1448 1449 if (minor) 1450 ret = find_free_port(minor - 1, fp); 1451 else 1452 ret = find_best_unit(fp); 1453 1454 mutex_unlock(&ipath_mutex); 1455 return ret; 1456} 1457 1458/** 1459 * unlock_exptid - unlock any expected TID entries port still had in use 1460 * @pd: port 1461 * 1462 * We don't actually update the chip here, because we do a bulk update 1463 * below, using ipath_f_clear_tids. 1464 */ 1465static void unlock_expected_tids(struct ipath_portdata *pd) 1466{ 1467 struct ipath_devdata *dd = pd->port_dd; 1468 int port_tidbase = pd->port_port * dd->ipath_rcvtidcnt; 1469 int i, cnt = 0, maxtid = port_tidbase + dd->ipath_rcvtidcnt; 1470 1471 ipath_cdbg(VERBOSE, "Port %u unlocking any locked expTID pages\n", 1472 pd->port_port); 1473 for (i = port_tidbase; i < maxtid; i++) { 1474 if (!dd->ipath_pageshadow[i]) 1475 continue; 1476 1477 ipath_release_user_pages_on_close(&dd->ipath_pageshadow[i], 1478 1); 1479 dd->ipath_pageshadow[i] = NULL; 1480 cnt++; 1481 ipath_stats.sps_pageunlocks++; 1482 } 1483 if (cnt) 1484 ipath_cdbg(VERBOSE, "Port %u locked %u expTID entries\n", 1485 pd->port_port, cnt); 1486 1487 if (ipath_stats.sps_pagelocks || ipath_stats.sps_pageunlocks) 1488 ipath_cdbg(VERBOSE, "%llu pages locked, %llu unlocked\n", 1489 (unsigned long long) ipath_stats.sps_pagelocks, 1490 (unsigned long long) 1491 ipath_stats.sps_pageunlocks); 1492} 1493 1494static int ipath_close(struct inode *in, struct file *fp) 1495{ 1496 int ret = 0; 1497 struct ipath_portdata *pd; 1498 struct ipath_devdata *dd; 1499 unsigned port; 1500 1501 ipath_cdbg(VERBOSE, "close on dev %lx, private data %p\n", 1502 (long)in->i_rdev, fp->private_data); 1503 1504 mutex_lock(&ipath_mutex); 1505 1506 pd = port_fp(fp); 1507 port = pd->port_port; 1508 fp->private_data = NULL; 1509 dd = pd->port_dd; 1510 1511 if (pd->port_hdrqfull) { 1512 ipath_cdbg(PROC, "%s[%u] had %u rcvhdrqfull errors " 1513 "during run\n", pd->port_comm, pd->port_pid, 1514 pd->port_hdrqfull); 1515 pd->port_hdrqfull = 0; 1516 } 1517 1518 if (pd->port_rcvwait_to || pd->port_piowait_to 1519 || pd->port_rcvnowait || pd->port_pionowait) { 1520 ipath_cdbg(VERBOSE, "port%u, %u rcv, %u pio wait timeo; " 1521 "%u rcv %u, pio already\n", 1522 pd->port_port, pd->port_rcvwait_to, 1523 pd->port_piowait_to, pd->port_rcvnowait, 1524 pd->port_pionowait); 1525 pd->port_rcvwait_to = pd->port_piowait_to = 1526 pd->port_rcvnowait = pd->port_pionowait = 0; 1527 } 1528 if (pd->port_flag) { 1529 ipath_dbg("port %u port_flag still set to 0x%lx\n", 1530 pd->port_port, pd->port_flag); 1531 pd->port_flag = 0; 1532 } 1533 1534 if (dd->ipath_kregbase) { 1535 if (pd->port_rcvhdrtail_uaddr) { 1536 pd->port_rcvhdrtail_uaddr = 0; 1537 pd->port_rcvhdrtail_kvaddr = NULL; 1538 ipath_release_user_pages_on_close( 1539 &pd->port_rcvhdrtail_pagep, 1); 1540 pd->port_rcvhdrtail_pagep = NULL; 1541 ipath_stats.sps_pageunlocks++; 1542 } 1543 ipath_write_kreg_port( 1544 dd, dd->ipath_kregs->kr_rcvhdrtailaddr, 1545 port, 0ULL); 1546 ipath_write_kreg_port( 1547 dd, dd->ipath_kregs->kr_rcvhdraddr, 1548 pd->port_port, 0); 1549 1550 /* clean up the pkeys for this port user */ 1551 ipath_clean_part_key(pd, dd); 1552 1553 if (port < dd->ipath_cfgports) { 1554 int i = dd->ipath_pbufsport * (port - 1); 1555 ipath_disarm_piobufs(dd, i, dd->ipath_pbufsport); 1556 1557 /* atomically clear receive enable port. */ 1558 clear_bit(INFINIPATH_R_PORTENABLE_SHIFT + port, 1559 &dd->ipath_rcvctrl); 1560 ipath_write_kreg( 1561 dd, 1562 dd->ipath_kregs->kr_rcvctrl, 1563 dd->ipath_rcvctrl); 1564 1565 if (dd->ipath_pageshadow) 1566 unlock_expected_tids(pd); 1567 ipath_stats.sps_ports--; 1568 ipath_cdbg(PROC, "%s[%u] closed port %u:%u\n", 1569 pd->port_comm, pd->port_pid, 1570 dd->ipath_unit, port); 1571 } 1572 } 1573 1574 pd->port_cnt = 0; 1575 pd->port_pid = 0; 1576 1577 dd->ipath_f_clear_tids(dd, pd->port_port); 1578 1579 ipath_free_pddata(dd, pd->port_port, 0); 1580 1581 mutex_unlock(&ipath_mutex); 1582 1583 return ret; 1584} 1585 1586static int ipath_port_info(struct ipath_portdata *pd, 1587 struct ipath_port_info __user *uinfo) 1588{ 1589 struct ipath_port_info info; 1590 int nup; 1591 int ret; 1592 1593 (void) ipath_count_units(NULL, &nup, NULL); 1594 info.num_active = nup; 1595 info.unit = pd->port_dd->ipath_unit; 1596 info.port = pd->port_port; 1597 1598 if (copy_to_user(uinfo, &info, sizeof(info))) { 1599 ret = -EFAULT; 1600 goto bail; 1601 } 1602 ret = 0; 1603 1604bail: 1605 return ret; 1606} 1607 1608static ssize_t ipath_write(struct file *fp, const char __user *data, 1609 size_t count, loff_t *off) 1610{ 1611 const struct ipath_cmd __user *ucmd; 1612 struct ipath_portdata *pd; 1613 const void __user *src; 1614 size_t consumed, copy; 1615 struct ipath_cmd cmd; 1616 ssize_t ret = 0; 1617 void *dest; 1618 1619 if (count < sizeof(cmd.type)) { 1620 ret = -EINVAL; 1621 goto bail; 1622 } 1623 1624 ucmd = (const struct ipath_cmd __user *) data; 1625 1626 if (copy_from_user(&cmd.type, &ucmd->type, sizeof(cmd.type))) { 1627 ret = -EFAULT; 1628 goto bail; 1629 } 1630 1631 consumed = sizeof(cmd.type); 1632 1633 switch (cmd.type) { 1634 case IPATH_CMD_USER_INIT: 1635 copy = sizeof(cmd.cmd.user_info); 1636 dest = &cmd.cmd.user_info; 1637 src = &ucmd->cmd.user_info; 1638 break; 1639 case IPATH_CMD_RECV_CTRL: 1640 copy = sizeof(cmd.cmd.recv_ctrl); 1641 dest = &cmd.cmd.recv_ctrl; 1642 src = &ucmd->cmd.recv_ctrl; 1643 break; 1644 case IPATH_CMD_PORT_INFO: 1645 copy = sizeof(cmd.cmd.port_info); 1646 dest = &cmd.cmd.port_info; 1647 src = &ucmd->cmd.port_info; 1648 break; 1649 case IPATH_CMD_TID_UPDATE: 1650 case IPATH_CMD_TID_FREE: 1651 copy = sizeof(cmd.cmd.tid_info); 1652 dest = &cmd.cmd.tid_info; 1653 src = &ucmd->cmd.tid_info; 1654 break; 1655 case IPATH_CMD_SET_PART_KEY: 1656 copy = sizeof(cmd.cmd.part_key); 1657 dest = &cmd.cmd.part_key; 1658 src = &ucmd->cmd.part_key; 1659 break; 1660 default: 1661 ret = -EINVAL; 1662 goto bail; 1663 } 1664 1665 if ((count - consumed) < copy) { 1666 ret = -EINVAL; 1667 goto bail; 1668 } 1669 1670 if (copy_from_user(dest, src, copy)) { 1671 ret = -EFAULT; 1672 goto bail; 1673 } 1674 1675 consumed += copy; 1676 pd = port_fp(fp); 1677 1678 switch (cmd.type) { 1679 case IPATH_CMD_USER_INIT: 1680 ret = ipath_do_user_init(pd, &cmd.cmd.user_info); 1681 if (ret < 0) 1682 goto bail; 1683 ret = ipath_get_base_info( 1684 pd, (void __user *) (unsigned long) 1685 cmd.cmd.user_info.spu_base_info, 1686 cmd.cmd.user_info.spu_base_info_size); 1687 break; 1688 case IPATH_CMD_RECV_CTRL: 1689 ret = ipath_manage_rcvq(pd, cmd.cmd.recv_ctrl); 1690 break; 1691 case IPATH_CMD_PORT_INFO: 1692 ret = ipath_port_info(pd, 1693 (struct ipath_port_info __user *) 1694 (unsigned long) cmd.cmd.port_info); 1695 break; 1696 case IPATH_CMD_TID_UPDATE: 1697 ret = ipath_tid_update(pd, &cmd.cmd.tid_info); 1698 break; 1699 case IPATH_CMD_TID_FREE: 1700 ret = ipath_tid_free(pd, &cmd.cmd.tid_info); 1701 break; 1702 case IPATH_CMD_SET_PART_KEY: 1703 ret = ipath_set_part_key(pd, cmd.cmd.part_key); 1704 break; 1705 } 1706 1707 if (ret >= 0) 1708 ret = consumed; 1709 1710bail: 1711 return ret; 1712} 1713 1714static struct class *ipath_class; 1715 1716static int init_cdev(int minor, char *name, struct file_operations *fops, 1717 struct cdev **cdevp, struct class_device **class_devp) 1718{ 1719 const dev_t dev = MKDEV(IPATH_MAJOR, minor); 1720 struct cdev *cdev = NULL; 1721 struct class_device *class_dev = NULL; 1722 int ret; 1723 1724 cdev = cdev_alloc(); 1725 if (!cdev) { 1726 printk(KERN_ERR IPATH_DRV_NAME 1727 ": Could not allocate cdev for minor %d, %s\n", 1728 minor, name); 1729 ret = -ENOMEM; 1730 goto done; 1731 } 1732 1733 cdev->owner = THIS_MODULE; 1734 cdev->ops = fops; 1735 kobject_set_name(&cdev->kobj, name); 1736 1737 ret = cdev_add(cdev, dev, 1); 1738 if (ret < 0) { 1739 printk(KERN_ERR IPATH_DRV_NAME 1740 ": Could not add cdev for minor %d, %s (err %d)\n", 1741 minor, name, -ret); 1742 goto err_cdev; 1743 } 1744 1745 class_dev = class_device_create(ipath_class, NULL, dev, NULL, name); 1746 1747 if (IS_ERR(class_dev)) { 1748 ret = PTR_ERR(class_dev); 1749 printk(KERN_ERR IPATH_DRV_NAME ": Could not create " 1750 "class_dev for minor %d, %s (err %d)\n", 1751 minor, name, -ret); 1752 goto err_cdev; 1753 } 1754 1755 goto done; 1756 1757err_cdev: 1758 cdev_del(cdev); 1759 cdev = NULL; 1760 1761done: 1762 if (ret >= 0) { 1763 *cdevp = cdev; 1764 *class_devp = class_dev; 1765 } else { 1766 *cdevp = NULL; 1767 *class_devp = NULL; 1768 } 1769 1770 return ret; 1771} 1772 1773int ipath_cdev_init(int minor, char *name, struct file_operations *fops, 1774 struct cdev **cdevp, struct class_device **class_devp) 1775{ 1776 return init_cdev(minor, name, fops, cdevp, class_devp); 1777} 1778 1779static void cleanup_cdev(struct cdev **cdevp, 1780 struct class_device **class_devp) 1781{ 1782 struct class_device *class_dev = *class_devp; 1783 1784 if (class_dev) { 1785 class_device_unregister(class_dev); 1786 *class_devp = NULL; 1787 } 1788 1789 if (*cdevp) { 1790 cdev_del(*cdevp); 1791 *cdevp = NULL; 1792 } 1793} 1794 1795void ipath_cdev_cleanup(struct cdev **cdevp, 1796 struct class_device **class_devp) 1797{ 1798 cleanup_cdev(cdevp, class_devp); 1799} 1800 1801static struct cdev *wildcard_cdev; 1802static struct class_device *wildcard_class_dev; 1803 1804static const dev_t dev = MKDEV(IPATH_MAJOR, 0); 1805 1806static int user_init(void) 1807{ 1808 int ret; 1809 1810 ret = register_chrdev_region(dev, IPATH_NMINORS, IPATH_DRV_NAME); 1811 if (ret < 0) { 1812 printk(KERN_ERR IPATH_DRV_NAME ": Could not register " 1813 "chrdev region (err %d)\n", -ret); 1814 goto done; 1815 } 1816 1817 ipath_class = class_create(THIS_MODULE, IPATH_DRV_NAME); 1818 1819 if (IS_ERR(ipath_class)) { 1820 ret = PTR_ERR(ipath_class); 1821 printk(KERN_ERR IPATH_DRV_NAME ": Could not create " 1822 "device class (err %d)\n", -ret); 1823 goto bail; 1824 } 1825 1826 goto done; 1827bail: 1828 unregister_chrdev_region(dev, IPATH_NMINORS); 1829done: 1830 return ret; 1831} 1832 1833static void user_cleanup(void) 1834{ 1835 if (ipath_class) { 1836 class_destroy(ipath_class); 1837 ipath_class = NULL; 1838 } 1839 1840 unregister_chrdev_region(dev, IPATH_NMINORS); 1841} 1842 1843static atomic_t user_count = ATOMIC_INIT(0); 1844static atomic_t user_setup = ATOMIC_INIT(0); 1845 1846int ipath_user_add(struct ipath_devdata *dd) 1847{ 1848 char name[10]; 1849 int ret; 1850 1851 if (atomic_inc_return(&user_count) == 1) { 1852 ret = user_init(); 1853 if (ret < 0) { 1854 ipath_dev_err(dd, "Unable to set up user support: " 1855 "error %d\n", -ret); 1856 goto bail; 1857 } 1858 ret = ipath_diag_init(); 1859 if (ret < 0) { 1860 ipath_dev_err(dd, "Unable to set up diag support: " 1861 "error %d\n", -ret); 1862 goto bail_sma; 1863 } 1864 1865 ret = init_cdev(0, "ipath", &ipath_file_ops, &wildcard_cdev, 1866 &wildcard_class_dev); 1867 if (ret < 0) { 1868 ipath_dev_err(dd, "Could not create wildcard " 1869 "minor: error %d\n", -ret); 1870 goto bail_diag; 1871 } 1872 1873 atomic_set(&user_setup, 1); 1874 } 1875 1876 snprintf(name, sizeof(name), "ipath%d", dd->ipath_unit); 1877 1878 ret = init_cdev(dd->ipath_unit + 1, name, &ipath_file_ops, 1879 &dd->cdev, &dd->class_dev); 1880 if (ret < 0) 1881 ipath_dev_err(dd, "Could not create user minor %d, %s\n", 1882 dd->ipath_unit + 1, name); 1883 1884 goto bail; 1885 1886bail_diag: 1887 ipath_diag_cleanup(); 1888bail_sma: 1889 user_cleanup(); 1890bail: 1891 return ret; 1892} 1893 1894void ipath_user_del(struct ipath_devdata *dd) 1895{ 1896 cleanup_cdev(&dd->cdev, &dd->class_dev); 1897 1898 if (atomic_dec_return(&user_count) == 0) { 1899 if (atomic_read(&user_setup) == 0) 1900 goto bail; 1901 1902 cleanup_cdev(&wildcard_cdev, &wildcard_class_dev); 1903 ipath_diag_cleanup(); 1904 user_cleanup(); 1905 1906 atomic_set(&user_setup, 0); 1907 } 1908bail: 1909 return; 1910} 1911