git.oblomov.eu Git - linux-2.6/blob - drivers/infiniband/hw/ipath/ipath_init_chip.c

   1 /*
   2  * Copyright (c) 2006, 2007, 2008 QLogic Corporation. All rights reserved.
   3  * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/pci.h>
  35 #include <linux/netdevice.h>
  36 #include <linux/vmalloc.h>
  37
  38 #include "ipath_kernel.h"
  39 #include "ipath_common.h"
  40
  41 /*
  42  * min buffers we want to have per port, after driver
  43  */
  44 #define IPATH_MIN_USER_PORT_BUFCNT 7
  45
  46 /*
  47  * Number of ports we are configured to use (to allow for more pio
  48  * buffers per port, etc.)  Zero means use chip value.
  49  */
  50 static ushort ipath_cfgports;
  51
  52 module_param_named(cfgports, ipath_cfgports, ushort, S_IRUGO);
  53 MODULE_PARM_DESC(cfgports, "Set max number of ports to use");
  54
  55 /*
  56  * Number of buffers reserved for driver (verbs and layered drivers.)
  57  * Initialized based on number of PIO buffers if not set via module interface.
  58  * The problem with this is that it's global, but we'll use different
  59  * numbers for different chip types.
  60  */
  61 static ushort ipath_kpiobufs;
  62
  63 static int ipath_set_kpiobufs(const char *val, struct kernel_param *kp);
  64
  65 module_param_call(kpiobufs, ipath_set_kpiobufs, param_get_ushort,
  66                   &ipath_kpiobufs, S_IWUSR | S_IRUGO);
  67 MODULE_PARM_DESC(kpiobufs, "Set number of PIO buffers for driver");
  68
  69 /**
  70  * create_port0_egr - allocate the eager TID buffers
  71  * @dd: the infinipath device
  72  *
  73  * This code is now quite different for user and kernel, because
  74  * the kernel uses skb's, for the accelerated network performance.
  75  * This is the kernel (port0) version.
  76  *
  77  * Allocate the eager TID buffers and program them into infinipath.
  78  * We use the network layer alloc_skb() allocator to allocate the
  79  * memory, and either use the buffers as is for things like verbs
  80  * packets, or pass the buffers up to the ipath layered driver and
  81  * thence the network layer, replacing them as we do so (see
  82  * ipath_rcv_layer()).
  83  */
  84 static int create_port0_egr(struct ipath_devdata *dd)
  85 {
  86         unsigned e, egrcnt;
  87         struct ipath_skbinfo *skbinfo;
  88         int ret;
  89
  90         egrcnt = dd->ipath_p0_rcvegrcnt;
  91
  92         skbinfo = vmalloc(sizeof(*dd->ipath_port0_skbinfo) * egrcnt);
  93         if (skbinfo == NULL) {
  94                 ipath_dev_err(dd, "allocation error for eager TID "
  95                               "skb array\n");
  96                 ret = -ENOMEM;
  97                 goto bail;
  98         }
  99         for (e = 0; e < egrcnt; e++) {
 100                 /*
 101                  * This is a bit tricky in that we allocate extra
 102                  * space for 2 bytes of the 14 byte ethernet header.
 103                  * These two bytes are passed in the ipath header so
 104                  * the rest of the data is word aligned.  We allocate
 105                  * 4 bytes so that the data buffer stays word aligned.
 106                  * See ipath_kreceive() for more details.
 107                  */
 108                 skbinfo[e].skb = ipath_alloc_skb(dd, GFP_KERNEL);
 109                 if (!skbinfo[e].skb) {
 110                         ipath_dev_err(dd, "SKB allocation error for "
 111                                       "eager TID %u\n", e);
 112                         while (e != 0)
 113                                 dev_kfree_skb(skbinfo[--e].skb);
 114                         vfree(skbinfo);
 115                         ret = -ENOMEM;
 116                         goto bail;
 117                 }
 118         }
 119         /*
 120          * After loop above, so we can test non-NULL to see if ready
 121          * to use at receive, etc.
 122          */
 123         dd->ipath_port0_skbinfo = skbinfo;
 124
 125         for (e = 0; e < egrcnt; e++) {
 126                 dd->ipath_port0_skbinfo[e].phys =
 127                   ipath_map_single(dd->pcidev,
 128                                    dd->ipath_port0_skbinfo[e].skb->data,
 129                                    dd->ipath_ibmaxlen, PCI_DMA_FROMDEVICE);
 130                 dd->ipath_f_put_tid(dd, e + (u64 __iomem *)
 131                                     ((char __iomem *) dd->ipath_kregbase +
 132                                      dd->ipath_rcvegrbase),
 133                                     RCVHQ_RCV_TYPE_EAGER,
 134                                     dd->ipath_port0_skbinfo[e].phys);
 135         }
 136
 137         ret = 0;
 138
 139 bail:
 140         return ret;
 141 }
 142
 143 static int bringup_link(struct ipath_devdata *dd)
 144 {
 145         u64 val, ibc;
 146         int ret = 0;
 147
 148         /* hold IBC in reset */
 149         dd->ipath_control &= ~INFINIPATH_C_LINKENABLE;
 150         ipath_write_kreg(dd, dd->ipath_kregs->kr_control,
 151                          dd->ipath_control);
 152
 153         /*
 154          * set initial max size pkt IBC will send, including ICRC; it's the
 155          * PIO buffer size in dwords, less 1; also see ipath_set_mtu()
 156          */
 157         val = (dd->ipath_ibmaxlen >> 2) + 1;
 158         ibc = val << dd->ibcc_mpl_shift;
 159
 160         /* flowcontrolwatermark is in units of KBytes */
 161         ibc |= 0x5ULL << INFINIPATH_IBCC_FLOWCTRLWATERMARK_SHIFT;
 162         /*
 163          * How often flowctrl sent.  More or less in usecs; balance against
 164          * watermark value, so that in theory senders always get a flow
 165          * control update in time to not let the IB link go idle.
 166          */
 167         ibc |= 0x3ULL << INFINIPATH_IBCC_FLOWCTRLPERIOD_SHIFT;
 168         /* max error tolerance */
 169         ibc |= 0xfULL << INFINIPATH_IBCC_PHYERRTHRESHOLD_SHIFT;
 170         /* use "real" buffer space for */
 171         ibc |= 4ULL << INFINIPATH_IBCC_CREDITSCALE_SHIFT;
 172         /* IB credit flow control. */
 173         ibc |= 0xfULL << INFINIPATH_IBCC_OVERRUNTHRESHOLD_SHIFT;
 174         /* initially come up waiting for TS1, without sending anything. */
 175         dd->ipath_ibcctrl = ibc;
 176         /*
 177          * Want to start out with both LINKCMD and LINKINITCMD in NOP
 178          * (0 and 0).  Don't put linkinitcmd in ipath_ibcctrl, want that
 179          * to stay a NOP. Flag that we are disabled, for the (unlikely)
 180          * case that some recovery path is trying to bring the link up
 181          * before we are ready.
 182          */
 183         ibc |= INFINIPATH_IBCC_LINKINITCMD_DISABLE <<
 184                 INFINIPATH_IBCC_LINKINITCMD_SHIFT;
 185         dd->ipath_flags |= IPATH_IB_LINK_DISABLED;
 186         ipath_cdbg(VERBOSE, "Writing 0x%llx to ibcctrl\n",
 187                    (unsigned long long) ibc);
 188         ipath_write_kreg(dd, dd->ipath_kregs->kr_ibcctrl, ibc);
 189
 190         // be sure chip saw it
 191         val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
 192
 193         ret = dd->ipath_f_bringup_serdes(dd);
 194
 195         if (ret)
 196                 dev_info(&dd->pcidev->dev, "Could not initialize SerDes, "
 197                          "not usable\n");
 198         else {
 199                 /* enable IBC */
 200                 dd->ipath_control |= INFINIPATH_C_LINKENABLE;
 201                 ipath_write_kreg(dd, dd->ipath_kregs->kr_control,
 202                                  dd->ipath_control);
 203         }
 204
 205         return ret;
 206 }
 207
 208 static struct ipath_portdata *create_portdata0(struct ipath_devdata *dd)
 209 {
 210         struct ipath_portdata *pd = NULL;
 211
 212         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 213         if (pd) {
 214                 pd->port_dd = dd;
 215                 pd->port_cnt = 1;
 216                 /* The port 0 pkey table is used by the layer interface. */
 217                 pd->port_pkeys[0] = IPATH_DEFAULT_P_KEY;
 218                 pd->port_seq_cnt = 1;
 219         }
 220         return pd;
 221 }
 222
 223 static int init_chip_first(struct ipath_devdata *dd)
 224 {
 225         struct ipath_portdata *pd;
 226         int ret = 0;
 227         u64 val;
 228
 229         spin_lock_init(&dd->ipath_kernel_tid_lock);
 230         spin_lock_init(&dd->ipath_user_tid_lock);
 231         spin_lock_init(&dd->ipath_sendctrl_lock);
 232         spin_lock_init(&dd->ipath_uctxt_lock);
 233         spin_lock_init(&dd->ipath_sdma_lock);
 234         spin_lock_init(&dd->ipath_gpio_lock);
 235         spin_lock_init(&dd->ipath_eep_st_lock);
 236         spin_lock_init(&dd->ipath_sdepb_lock);
 237         mutex_init(&dd->ipath_eep_lock);
 238
 239         /*
 240          * skip cfgports stuff because we are not allocating memory,
 241          * and we don't want problems if the portcnt changed due to
 242          * cfgports.  We do still check and report a difference, if
 243          * not same (should be impossible).
 244          */
 245         dd->ipath_f_config_ports(dd, ipath_cfgports);
 246         if (!ipath_cfgports)
 247                 dd->ipath_cfgports = dd->ipath_portcnt;
 248         else if (ipath_cfgports <= dd->ipath_portcnt) {
 249                 dd->ipath_cfgports = ipath_cfgports;
 250                 ipath_dbg("Configured to use %u ports out of %u in chip\n",
 251                           dd->ipath_cfgports, ipath_read_kreg32(dd,
 252                           dd->ipath_kregs->kr_portcnt));
 253         } else {
 254                 dd->ipath_cfgports = dd->ipath_portcnt;
 255                 ipath_dbg("Tried to configured to use %u ports; chip "
 256                           "only supports %u\n", ipath_cfgports,
 257                           ipath_read_kreg32(dd,
 258                                   dd->ipath_kregs->kr_portcnt));
 259         }
 260         /*
 261          * Allocate full portcnt array, rather than just cfgports, because
 262          * cleanup iterates across all possible ports.
 263          */
 264         dd->ipath_pd = kzalloc(sizeof(*dd->ipath_pd) * dd->ipath_portcnt,
 265                                GFP_KERNEL);
 266
 267         if (!dd->ipath_pd) {
 268                 ipath_dev_err(dd, "Unable to allocate portdata array, "
 269                               "failing\n");
 270                 ret = -ENOMEM;
 271                 goto done;
 272         }
 273
 274         pd = create_portdata0(dd);
 275         if (!pd) {
 276                 ipath_dev_err(dd, "Unable to allocate portdata for port "
 277                               "0, failing\n");
 278                 ret = -ENOMEM;
 279                 goto done;
 280         }
 281         dd->ipath_pd[0] = pd;
 282
 283         dd->ipath_rcvtidcnt =
 284                 ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvtidcnt);
 285         dd->ipath_rcvtidbase =
 286                 ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvtidbase);
 287         dd->ipath_rcvegrcnt =
 288                 ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvegrcnt);
 289         dd->ipath_rcvegrbase =
 290                 ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvegrbase);
 291         dd->ipath_palign =
 292                 ipath_read_kreg32(dd, dd->ipath_kregs->kr_pagealign);
 293         dd->ipath_piobufbase =
 294                 ipath_read_kreg64(dd, dd->ipath_kregs->kr_sendpiobufbase);
 295         val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_sendpiosize);
 296         dd->ipath_piosize2k = val & ~0U;
 297         dd->ipath_piosize4k = val >> 32;
 298         if (dd->ipath_piosize4k == 0 && ipath_mtu4096)
 299                 ipath_mtu4096 = 0; /* 4KB not supported by this chip */
 300         dd->ipath_ibmtu = ipath_mtu4096 ? 4096 : 2048;
 301         val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_sendpiobufcnt);
 302         dd->ipath_piobcnt2k = val & ~0U;
 303         dd->ipath_piobcnt4k = val >> 32;
 304         dd->ipath_pio2kbase =
 305                 (u32 __iomem *) (((char __iomem *) dd->ipath_kregbase) +
 306                                  (dd->ipath_piobufbase & 0xffffffff));
 307         if (dd->ipath_piobcnt4k) {
 308                 dd->ipath_pio4kbase = (u32 __iomem *)
 309                         (((char __iomem *) dd->ipath_kregbase) +
 310                          (dd->ipath_piobufbase >> 32));
 311                 /*
 312                  * 4K buffers take 2 pages; we use roundup just to be
 313                  * paranoid; we calculate it once here, rather than on
 314                  * ever buf allocate
 315                  */
 316                 dd->ipath_4kalign = ALIGN(dd->ipath_piosize4k,
 317                                           dd->ipath_palign);
 318                 ipath_dbg("%u 2k(%x) piobufs @ %p, %u 4k(%x) @ %p "
 319                           "(%x aligned)\n",
 320                           dd->ipath_piobcnt2k, dd->ipath_piosize2k,
 321                           dd->ipath_pio2kbase, dd->ipath_piobcnt4k,
 322                           dd->ipath_piosize4k, dd->ipath_pio4kbase,
 323                           dd->ipath_4kalign);
 324         }
 325         else ipath_dbg("%u 2k piobufs @ %p\n",
 326                        dd->ipath_piobcnt2k, dd->ipath_pio2kbase);
 327
 328 done:
 329         return ret;
 330 }
 331
 332 /**
 333  * init_chip_reset - re-initialize after a reset, or enable
 334  * @dd: the infinipath device
 335  *
 336  * sanity check at least some of the values after reset, and
 337  * ensure no receive or transmit (explictly, in case reset
 338  * failed
 339  */
 340 static int init_chip_reset(struct ipath_devdata *dd)
 341 {
 342         u32 rtmp;
 343         int i;
 344         unsigned long flags;
 345
 346         /*
 347          * ensure chip does no sends or receives, tail updates, or
 348          * pioavail updates while we re-initialize
 349          */
 350         dd->ipath_rcvctrl &= ~(1ULL << dd->ipath_r_tailupd_shift);
 351         for (i = 0; i < dd->ipath_portcnt; i++) {
 352                 clear_bit(dd->ipath_r_portenable_shift + i,
 353                           &dd->ipath_rcvctrl);
 354                 clear_bit(dd->ipath_r_intravail_shift + i,
 355                           &dd->ipath_rcvctrl);
 356         }
 357         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
 358                 dd->ipath_rcvctrl);
 359
 360         spin_lock_irqsave(&dd->ipath_sendctrl_lock, flags);
 361         dd->ipath_sendctrl = 0U; /* no sdma, etc */
 362         ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl, dd->ipath_sendctrl);
 363         ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
 364         spin_unlock_irqrestore(&dd->ipath_sendctrl_lock, flags);
 365
 366         ipath_write_kreg(dd, dd->ipath_kregs->kr_control, 0ULL);
 367
 368         rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvtidcnt);
 369         if (rtmp != dd->ipath_rcvtidcnt)
 370                 dev_info(&dd->pcidev->dev, "tidcnt was %u before "
 371                          "reset, now %u, using original\n",
 372                          dd->ipath_rcvtidcnt, rtmp);
 373         rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvtidbase);
 374         if (rtmp != dd->ipath_rcvtidbase)
 375                 dev_info(&dd->pcidev->dev, "tidbase was %u before "
 376                          "reset, now %u, using original\n",
 377                          dd->ipath_rcvtidbase, rtmp);
 378         rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvegrcnt);
 379         if (rtmp != dd->ipath_rcvegrcnt)
 380                 dev_info(&dd->pcidev->dev, "egrcnt was %u before "
 381                          "reset, now %u, using original\n",
 382                          dd->ipath_rcvegrcnt, rtmp);
 383         rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvegrbase);
 384         if (rtmp != dd->ipath_rcvegrbase)
 385                 dev_info(&dd->pcidev->dev, "egrbase was %u before "
 386                          "reset, now %u, using original\n",
 387                          dd->ipath_rcvegrbase, rtmp);
 388
 389         return 0;
 390 }
 391
 392 static int init_pioavailregs(struct ipath_devdata *dd)
 393 {
 394         int ret;
 395
 396         dd->ipath_pioavailregs_dma = dma_alloc_coherent(
 397                 &dd->pcidev->dev, PAGE_SIZE, &dd->ipath_pioavailregs_phys,
 398                 GFP_KERNEL);
 399         if (!dd->ipath_pioavailregs_dma) {
 400                 ipath_dev_err(dd, "failed to allocate PIOavail reg area "
 401                               "in memory\n");
 402                 ret = -ENOMEM;
 403                 goto done;
 404         }
 405
 406         /*
 407          * we really want L2 cache aligned, but for current CPUs of
 408          * interest, they are the same.
 409          */
 410         dd->ipath_statusp = (u64 *)
 411                 ((char *)dd->ipath_pioavailregs_dma +
 412                  ((2 * L1_CACHE_BYTES +
 413                    dd->ipath_pioavregs * sizeof(u64)) & ~L1_CACHE_BYTES));
 414         /* copy the current value now that it's really allocated */
 415         *dd->ipath_statusp = dd->_ipath_status;
 416         /*
 417          * setup buffer to hold freeze msg, accessible to apps,
 418          * following statusp
 419          */
 420         dd->ipath_freezemsg = (char *)&dd->ipath_statusp[1];
 421         /* and its length */
 422         dd->ipath_freezelen = L1_CACHE_BYTES - sizeof(dd->ipath_statusp[0]);
 423
 424         ret = 0;
 425
 426 done:
 427         return ret;
 428 }
 429
 430 /**
 431  * init_shadow_tids - allocate the shadow TID array
 432  * @dd: the infinipath device
 433  *
 434  * allocate the shadow TID array, so we can ipath_munlock previous
 435  * entries.  It may make more sense to move the pageshadow to the
 436  * port data structure, so we only allocate memory for ports actually
 437  * in use, since we at 8k per port, now.
 438  */
 439 static void init_shadow_tids(struct ipath_devdata *dd)
 440 {
 441         struct page **pages;
 442         dma_addr_t *addrs;
 443
 444         pages = vmalloc(dd->ipath_cfgports * dd->ipath_rcvtidcnt *
 445                         sizeof(struct page *));
 446         if (!pages) {
 447                 ipath_dev_err(dd, "failed to allocate shadow page * "
 448                               "array, no expected sends!\n");
 449                 dd->ipath_pageshadow = NULL;
 450                 return;
 451         }
 452
 453         addrs = vmalloc(dd->ipath_cfgports * dd->ipath_rcvtidcnt *
 454                         sizeof(dma_addr_t));
 455         if (!addrs) {
 456                 ipath_dev_err(dd, "failed to allocate shadow dma handle "
 457                               "array, no expected sends!\n");
 458                 vfree(pages);
 459                 dd->ipath_pageshadow = NULL;
 460                 return;
 461         }
 462
 463         memset(pages, 0, dd->ipath_cfgports * dd->ipath_rcvtidcnt *
 464                sizeof(struct page *));
 465
 466         dd->ipath_pageshadow = pages;
 467         dd->ipath_physshadow = addrs;
 468 }
 469
 470 static void enable_chip(struct ipath_devdata *dd, int reinit)
 471 {
 472         u32 val;
 473         u64 rcvmask;
 474         unsigned long flags;
 475         int i;
 476
 477         if (!reinit)
 478                 init_waitqueue_head(&ipath_state_wait);
 479
 480         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
 481                          dd->ipath_rcvctrl);
 482
 483         spin_lock_irqsave(&dd->ipath_sendctrl_lock, flags);
 484         /* Enable PIO send, and update of PIOavail regs to memory. */
 485         dd->ipath_sendctrl = INFINIPATH_S_PIOENABLE |
 486                 INFINIPATH_S_PIOBUFAVAILUPD;
 487
 488         /*
 489          * Set the PIO avail update threshold to host memory
 490          * on chips that support it.
 491          */
 492         if (dd->ipath_pioupd_thresh)
 493                 dd->ipath_sendctrl |= dd->ipath_pioupd_thresh
 494                         << INFINIPATH_S_UPDTHRESH_SHIFT;
 495         ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl, dd->ipath_sendctrl);
 496         ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
 497         spin_unlock_irqrestore(&dd->ipath_sendctrl_lock, flags);
 498
 499         /*
 500          * Enable kernel ports' receive and receive interrupt.
 501          * Other ports done as user opens and inits them.
 502          */
 503         rcvmask = 1ULL;
 504         dd->ipath_rcvctrl |= (rcvmask << dd->ipath_r_portenable_shift) |
 505                 (rcvmask << dd->ipath_r_intravail_shift);
 506         if (!(dd->ipath_flags & IPATH_NODMA_RTAIL))
 507                 dd->ipath_rcvctrl |= (1ULL << dd->ipath_r_tailupd_shift);
 508
 509         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
 510                          dd->ipath_rcvctrl);
 511
 512         /*
 513          * now ready for use.  this should be cleared whenever we
 514          * detect a reset, or initiate one.
 515          */
 516         dd->ipath_flags |= IPATH_INITTED;
 517
 518         /*
 519          * Init our shadow copies of head from tail values,
 520          * and write head values to match.
 521          */
 522         val = ipath_read_ureg32(dd, ur_rcvegrindextail, 0);
 523         ipath_write_ureg(dd, ur_rcvegrindexhead, val, 0);
 524
 525         /* Initialize so we interrupt on next packet received */
 526         ipath_write_ureg(dd, ur_rcvhdrhead,
 527                          dd->ipath_rhdrhead_intr_off |
 528                          dd->ipath_pd[0]->port_head, 0);
 529
 530         /*
 531          * by now pioavail updates to memory should have occurred, so
 532          * copy them into our working/shadow registers; this is in
 533          * case something went wrong with abort, but mostly to get the
 534          * initial values of the generation bit correct.
 535          */
 536         for (i = 0; i < dd->ipath_pioavregs; i++) {
 537                 __le64 pioavail;
 538
 539                 /*
 540                  * Chip Errata bug 6641; even and odd qwords>3 are swapped.
 541                  */
 542                 if (i > 3 && (dd->ipath_flags & IPATH_SWAP_PIOBUFS))
 543                         pioavail = dd->ipath_pioavailregs_dma[i ^ 1];
 544                 else
 545                         pioavail = dd->ipath_pioavailregs_dma[i];
 546                 /*
 547                  * don't need to worry about ipath_pioavailkernel here
 548                  * because we will call ipath_chg_pioavailkernel() later
 549                  * in initialization, to busy out buffers as needed
 550                  */
 551                 dd->ipath_pioavailshadow[i] = le64_to_cpu(pioavail);
 552         }
 553         /* can get counters, stats, etc. */
 554         dd->ipath_flags |= IPATH_PRESENT;
 555 }
 556
 557 static int init_housekeeping(struct ipath_devdata *dd, int reinit)
 558 {
 559         char boardn[40];
 560         int ret = 0;
 561
 562         /*
 563          * have to clear shadow copies of registers at init that are
 564          * not otherwise set here, or all kinds of bizarre things
 565          * happen with driver on chip reset
 566          */
 567         dd->ipath_rcvhdrsize = 0;
 568
 569         /*
 570          * Don't clear ipath_flags as 8bit mode was set before
 571          * entering this func. However, we do set the linkstate to
 572          * unknown, so we can watch for a transition.
 573          * PRESENT is set because we want register reads to work,
 574          * and the kernel infrastructure saw it in config space;
 575          * We clear it if we have failures.
 576          */
 577         dd->ipath_flags |= IPATH_LINKUNK | IPATH_PRESENT;
 578         dd->ipath_flags &= ~(IPATH_LINKACTIVE | IPATH_LINKARMED |
 579                              IPATH_LINKDOWN | IPATH_LINKINIT);
 580
 581         ipath_cdbg(VERBOSE, "Try to read spc chip revision\n");
 582         dd->ipath_revision =
 583                 ipath_read_kreg64(dd, dd->ipath_kregs->kr_revision);
 584
 585         /*
 586          * set up fundamental info we need to use the chip; we assume
 587          * if the revision reg and these regs are OK, we don't need to
 588          * special case the rest
 589          */
 590         dd->ipath_sregbase =
 591                 ipath_read_kreg32(dd, dd->ipath_kregs->kr_sendregbase);
 592         dd->ipath_cregbase =
 593                 ipath_read_kreg32(dd, dd->ipath_kregs->kr_counterregbase);
 594         dd->ipath_uregbase =
 595                 ipath_read_kreg32(dd, dd->ipath_kregs->kr_userregbase);
 596         ipath_cdbg(VERBOSE, "ipath_kregbase %p, sendbase %x usrbase %x, "
 597                    "cntrbase %x\n", dd->ipath_kregbase, dd->ipath_sregbase,
 598                    dd->ipath_uregbase, dd->ipath_cregbase);
 599         if ((dd->ipath_revision & 0xffffffff) == 0xffffffff
 600             || (dd->ipath_sregbase & 0xffffffff) == 0xffffffff
 601             || (dd->ipath_cregbase & 0xffffffff) == 0xffffffff
 602             || (dd->ipath_uregbase & 0xffffffff) == 0xffffffff) {
 603                 ipath_dev_err(dd, "Register read failures from chip, "
 604                               "giving up initialization\n");
 605                 dd->ipath_flags &= ~IPATH_PRESENT;
 606                 ret = -ENODEV;
 607                 goto done;
 608         }
 609
 610
 611         /* clear diagctrl register, in case diags were running and crashed */
 612         ipath_write_kreg (dd, dd->ipath_kregs->kr_hwdiagctrl, 0);
 613
 614         /* clear the initial reset flag, in case first driver load */
 615         ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear,
 616                          INFINIPATH_E_RESET);
 617
 618         ipath_cdbg(VERBOSE, "Revision %llx (PCI %x)\n",
 619                    (unsigned long long) dd->ipath_revision,
 620                    dd->ipath_pcirev);
 621
 622         if (((dd->ipath_revision >> INFINIPATH_R_SOFTWARE_SHIFT) &
 623              INFINIPATH_R_SOFTWARE_MASK) != IPATH_CHIP_SWVERSION) {
 624                 ipath_dev_err(dd, "Driver only handles version %d, "
 625                               "chip swversion is %d (%llx), failng\n",
 626                               IPATH_CHIP_SWVERSION,
 627                               (int)(dd->ipath_revision >>
 628                                     INFINIPATH_R_SOFTWARE_SHIFT) &
 629                               INFINIPATH_R_SOFTWARE_MASK,
 630                               (unsigned long long) dd->ipath_revision);
 631                 ret = -ENOSYS;
 632                 goto done;
 633         }
 634         dd->ipath_majrev = (u8) ((dd->ipath_revision >>
 635                                   INFINIPATH_R_CHIPREVMAJOR_SHIFT) &
 636                                  INFINIPATH_R_CHIPREVMAJOR_MASK);
 637         dd->ipath_minrev = (u8) ((dd->ipath_revision >>
 638                                   INFINIPATH_R_CHIPREVMINOR_SHIFT) &
 639                                  INFINIPATH_R_CHIPREVMINOR_MASK);
 640         dd->ipath_boardrev = (u8) ((dd->ipath_revision >>
 641                                     INFINIPATH_R_BOARDID_SHIFT) &
 642                                    INFINIPATH_R_BOARDID_MASK);
 643
 644         ret = dd->ipath_f_get_boardname(dd, boardn, sizeof boardn);
 645
 646         snprintf(dd->ipath_boardversion, sizeof(dd->ipath_boardversion),
 647                  "ChipABI %u.%u, %s, InfiniPath%u %u.%u, PCI %u, "
 648                  "SW Compat %u\n",
 649                  IPATH_CHIP_VERS_MAJ, IPATH_CHIP_VERS_MIN, boardn,
 650                  (unsigned)(dd->ipath_revision >> INFINIPATH_R_ARCH_SHIFT) &
 651                  INFINIPATH_R_ARCH_MASK,
 652                  dd->ipath_majrev, dd->ipath_minrev, dd->ipath_pcirev,
 653                  (unsigned)(dd->ipath_revision >>
 654                             INFINIPATH_R_SOFTWARE_SHIFT) &
 655                  INFINIPATH_R_SOFTWARE_MASK);
 656
 657         ipath_dbg("%s", dd->ipath_boardversion);
 658
 659         if (ret)
 660                 goto done;
 661
 662         if (reinit)
 663                 ret = init_chip_reset(dd);
 664         else
 665                 ret = init_chip_first(dd);
 666
 667 done:
 668         return ret;
 669 }
 670
 671 static void verify_interrupt(unsigned long opaque)
 672 {
 673         struct ipath_devdata *dd = (struct ipath_devdata *) opaque;
 674
 675         if (!dd)
 676                 return; /* being torn down */
 677
 678         /*
 679          * If we don't have any interrupts, let the user know and
 680          * don't bother checking again.
 681          */
 682         if (dd->ipath_int_counter == 0) {
 683                 if (!dd->ipath_f_intr_fallback(dd))
 684                         dev_err(&dd->pcidev->dev, "No interrupts detected, "
 685                                 "not usable.\n");
 686                 else /* re-arm the timer to see if fallback works */
 687                         mod_timer(&dd->ipath_intrchk_timer, jiffies + HZ/2);
 688         } else
 689                 ipath_cdbg(VERBOSE, "%u interrupts at timer check\n",
 690                         dd->ipath_int_counter);
 691 }
 692
 693 /**
 694  * ipath_init_chip - do the actual initialization sequence on the chip
 695  * @dd: the infinipath device
 696  * @reinit: reinitializing, so don't allocate new memory
 697  *
 698  * Do the actual initialization sequence on the chip.  This is done
 699  * both from the init routine called from the PCI infrastructure, and
 700  * when we reset the chip, or detect that it was reset internally,
 701  * or it's administratively re-enabled.
 702  *
 703  * Memory allocation here and in called routines is only done in
 704  * the first case (reinit == 0).  We have to be careful, because even
 705  * without memory allocation, we need to re-write all the chip registers
 706  * TIDs, etc. after the reset or enable has completed.
 707  */
 708 int ipath_init_chip(struct ipath_devdata *dd, int reinit)
 709 {
 710         int ret = 0;
 711         u32 kpiobufs, defkbufs;
 712         u32 piobufs, uports;
 713         u64 val;
 714         struct ipath_portdata *pd;
 715         gfp_t gfp_flags = GFP_USER | __GFP_COMP;
 716
 717         ret = init_housekeeping(dd, reinit);
 718         if (ret)
 719                 goto done;
 720
 721         /*
 722          * we ignore most issues after reporting them, but have to specially
 723          * handle hardware-disabled chips.
 724          */
 725         if (ret == 2) {
 726                 /* unique error, known to ipath_init_one */
 727                 ret = -EPERM;
 728                 goto done;
 729         }
 730
 731         /*
 732          * We could bump this to allow for full rcvegrcnt + rcvtidcnt,
 733          * but then it no longer nicely fits power of two, and since
 734          * we now use routines that backend onto __get_free_pages, the
 735          * rest would be wasted.
 736          */
 737         dd->ipath_rcvhdrcnt = max(dd->ipath_p0_rcvegrcnt, dd->ipath_rcvegrcnt);
 738         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvhdrcnt,
 739                          dd->ipath_rcvhdrcnt);
 740
 741         /*
 742          * Set up the shadow copies of the piobufavail registers,
 743          * which we compare against the chip registers for now, and
 744          * the in memory DMA'ed copies of the registers.  This has to
 745          * be done early, before we calculate lastport, etc.
 746          */
 747         piobufs = dd->ipath_piobcnt2k + dd->ipath_piobcnt4k;
 748         /*
 749          * calc number of pioavail registers, and save it; we have 2
 750          * bits per buffer.
 751          */
 752         dd->ipath_pioavregs = ALIGN(piobufs, sizeof(u64) * BITS_PER_BYTE / 2)
 753                 / (sizeof(u64) * BITS_PER_BYTE / 2);
 754         uports = dd->ipath_cfgports ? dd->ipath_cfgports - 1 : 0;
 755         if (piobufs > 144)
 756                 defkbufs = 32 + dd->ipath_pioreserved;
 757         else
 758                 defkbufs = 16 + dd->ipath_pioreserved;
 759
 760         if (ipath_kpiobufs && (ipath_kpiobufs +
 761                 (uports * IPATH_MIN_USER_PORT_BUFCNT)) > piobufs) {
 762                 int i = (int) piobufs -
 763                         (int) (uports * IPATH_MIN_USER_PORT_BUFCNT);
 764                 if (i < 1)
 765                         i = 1;
 766                 dev_info(&dd->pcidev->dev, "Allocating %d PIO bufs of "
 767                          "%d for kernel leaves too few for %d user ports "
 768                          "(%d each); using %u\n", ipath_kpiobufs,
 769                          piobufs, uports, IPATH_MIN_USER_PORT_BUFCNT, i);
 770                 /*
 771                  * shouldn't change ipath_kpiobufs, because could be
 772                  * different for different devices...
 773                  */
 774                 kpiobufs = i;
 775         } else if (ipath_kpiobufs)
 776                 kpiobufs = ipath_kpiobufs;
 777         else
 778                 kpiobufs = defkbufs;
 779         dd->ipath_lastport_piobuf = piobufs - kpiobufs;
 780         dd->ipath_pbufsport =
 781                 uports ? dd->ipath_lastport_piobuf / uports : 0;
 782         /* if not an even divisor, some user ports get extra buffers */
 783         dd->ipath_ports_extrabuf = dd->ipath_lastport_piobuf -
 784                 (dd->ipath_pbufsport * uports);
 785         if (dd->ipath_ports_extrabuf)
 786                 ipath_dbg("%u pbufs/port leaves some unused, add 1 buffer to "
 787                         "ports <= %u\n", dd->ipath_pbufsport,
 788                         dd->ipath_ports_extrabuf);
 789         dd->ipath_lastpioindex = 0;
 790         dd->ipath_lastpioindexl = dd->ipath_piobcnt2k;
 791         /* ipath_pioavailshadow initialized earlier */
 792         ipath_cdbg(VERBOSE, "%d PIO bufs for kernel out of %d total %u "
 793                    "each for %u user ports\n", kpiobufs,
 794                    piobufs, dd->ipath_pbufsport, uports);
 795         ret = dd->ipath_f_early_init(dd);
 796         if (ret) {
 797                 ipath_dev_err(dd, "Early initialization failure\n");
 798                 goto done;
 799         }
 800
 801         /*
 802          * Early_init sets rcvhdrentsize and rcvhdrsize, so this must be
 803          * done after early_init.
 804          */
 805         dd->ipath_hdrqlast =
 806                 dd->ipath_rcvhdrentsize * (dd->ipath_rcvhdrcnt - 1);
 807         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvhdrentsize,
 808                          dd->ipath_rcvhdrentsize);
 809         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvhdrsize,
 810                          dd->ipath_rcvhdrsize);
 811
 812         if (!reinit) {
 813                 ret = init_pioavailregs(dd);
 814                 init_shadow_tids(dd);
 815                 if (ret)
 816                         goto done;
 817         }
 818
 819         ipath_write_kreg(dd, dd->ipath_kregs->kr_sendpioavailaddr,
 820                          dd->ipath_pioavailregs_phys);
 821
 822         /*
 823          * this is to detect s/w errors, which the h/w works around by
 824          * ignoring the low 6 bits of address, if it wasn't aligned.
 825          */
 826         val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_sendpioavailaddr);
 827         if (val != dd->ipath_pioavailregs_phys) {
 828                 ipath_dev_err(dd, "Catastrophic software error, "
 829                               "SendPIOAvailAddr written as %lx, "
 830                               "read back as %llx\n",
 831                               (unsigned long) dd->ipath_pioavailregs_phys,
 832                               (unsigned long long) val);
 833                 ret = -EINVAL;
 834                 goto done;
 835         }
 836
 837         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvbthqp, IPATH_KD_QP);
 838
 839         /*
 840          * make sure we are not in freeze, and PIO send enabled, so
 841          * writes to pbc happen
 842          */
 843         ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrmask, 0ULL);
 844         ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrclear,
 845                          ~0ULL&~INFINIPATH_HWE_MEMBISTFAILED);
 846         ipath_write_kreg(dd, dd->ipath_kregs->kr_control, 0ULL);
 847
 848         /*
 849          * before error clears, since we expect serdes pll errors during
 850          * this, the first time after reset
 851          */
 852         if (bringup_link(dd)) {
 853                 dev_info(&dd->pcidev->dev, "Failed to bringup IB link\n");
 854                 ret = -ENETDOWN;
 855                 goto done;
 856         }
 857
 858         /*
 859          * clear any "expected" hwerrs from reset and/or initialization
 860          * clear any that aren't enabled (at least this once), and then
 861          * set the enable mask
 862          */
 863         dd->ipath_f_init_hwerrors(dd);
 864         ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrclear,
 865                          ~0ULL&~INFINIPATH_HWE_MEMBISTFAILED);
 866         ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrmask,
 867                          dd->ipath_hwerrmask);
 868
 869         /* clear all */
 870         ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear, -1LL);
 871         /* enable errors that are masked, at least this first time. */
 872         ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
 873                          ~dd->ipath_maskederrs);
 874         dd->ipath_maskederrs = 0; /* don't re-enable ignored in timer */
 875         dd->ipath_errormask =
 876                 ipath_read_kreg64(dd, dd->ipath_kregs->kr_errormask);
 877         /* clear any interrupts up to this point (ints still not enabled) */
 878         ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, -1LL);
 879
 880         dd->ipath_f_tidtemplate(dd);
 881
 882         /*
 883          * Set up the port 0 (kernel) rcvhdr q and egr TIDs.  If doing
 884          * re-init, the simplest way to handle this is to free
 885          * existing, and re-allocate.
 886          * Need to re-create rest of port 0 portdata as well.
 887          */
 888         pd = dd->ipath_pd[0];
 889         if (reinit) {
 890                 struct ipath_portdata *npd;
 891
 892                 /*
 893                  * Alloc and init new ipath_portdata for port0,
 894                  * Then free old pd. Could lead to fragmentation, but also
 895                  * makes later support for hot-swap easier.
 896                  */
 897                 npd = create_portdata0(dd);
 898                 if (npd) {
 899                         ipath_free_pddata(dd, pd);
 900                         dd->ipath_pd[0] = npd;
 901                         pd = npd;
 902                 } else {
 903                         ipath_dev_err(dd, "Unable to allocate portdata"
 904                                       " for port 0, failing\n");
 905                         ret = -ENOMEM;
 906                         goto done;
 907                 }
 908         }
 909         ret = ipath_create_rcvhdrq(dd, pd);
 910         if (!ret)
 911                 ret = create_port0_egr(dd);
 912         if (ret) {
 913                 ipath_dev_err(dd, "failed to allocate kernel port's "
 914                               "rcvhdrq and/or egr bufs\n");
 915                 goto done;
 916         }
 917         else
 918                 enable_chip(dd, reinit);
 919
 920         /* after enable_chip, so pioavailshadow setup */
 921         ipath_chg_pioavailkernel(dd, 0, piobufs, 1);
 922
 923         /*
 924          * Cancel any possible active sends from early driver load.
 925          * Follows early_init because some chips have to initialize
 926          * PIO buffers in early_init to avoid false parity errors.
 927          * After enable and ipath_chg_pioavailkernel so we can safely
 928          * enable pioavail updates and PIOENABLE; packets are now
 929          * ready to go out.
 930          */
 931         ipath_cancel_sends(dd, 1);
 932
 933         if (!reinit) {
 934                 /*
 935                  * Used when we close a port, for DMA already in flight
 936                  * at close.
 937                  */
 938                 dd->ipath_dummy_hdrq = dma_alloc_coherent(
 939                         &dd->pcidev->dev, dd->ipath_pd[0]->port_rcvhdrq_size,
 940                         &dd->ipath_dummy_hdrq_phys,
 941                         gfp_flags);
 942                 if (!dd->ipath_dummy_hdrq) {
 943                         dev_info(&dd->pcidev->dev,
 944                                 "Couldn't allocate 0x%lx bytes for dummy hdrq\n",
 945                                 dd->ipath_pd[0]->port_rcvhdrq_size);
 946                         /* fallback to just 0'ing */
 947                         dd->ipath_dummy_hdrq_phys = 0UL;
 948                 }
 949         }
 950
 951         /*
 952          * cause retrigger of pending interrupts ignored during init,
 953          * even if we had errors
 954          */
 955         ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, 0ULL);
 956
 957         if (!dd->ipath_stats_timer_active) {
 958                 /*
 959                  * first init, or after an admin disable/enable
 960                  * set up stats retrieval timer, even if we had errors
 961                  * in last portion of setup
 962                  */
 963                 init_timer(&dd->ipath_stats_timer);
 964                 dd->ipath_stats_timer.function = ipath_get_faststats;
 965                 dd->ipath_stats_timer.data = (unsigned long) dd;
 966                 /* every 5 seconds; */
 967                 dd->ipath_stats_timer.expires = jiffies + 5 * HZ;
 968                 /* takes ~16 seconds to overflow at full IB 4x bandwdith */
 969                 add_timer(&dd->ipath_stats_timer);
 970                 dd->ipath_stats_timer_active = 1;
 971         }
 972
 973         /* Set up SendDMA if chip supports it */
 974         if (dd->ipath_flags & IPATH_HAS_SEND_DMA)
 975                 ret = setup_sdma(dd);
 976
 977         /* Set up HoL state */
 978         init_timer(&dd->ipath_hol_timer);
 979         dd->ipath_hol_timer.function = ipath_hol_event;
 980         dd->ipath_hol_timer.data = (unsigned long)dd;
 981         dd->ipath_hol_state = IPATH_HOL_UP;
 982
 983 done:
 984         if (!ret) {
 985                 *dd->ipath_statusp |= IPATH_STATUS_CHIP_PRESENT;
 986                 if (!dd->ipath_f_intrsetup(dd)) {
 987                         /* now we can enable all interrupts from the chip */
 988                         ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask,
 989                                          -1LL);
 990                         /* force re-interrupt of any pending interrupts. */
 991                         ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear,
 992                                          0ULL);
 993                         /* chip is usable; mark it as initialized */
 994                         *dd->ipath_statusp |= IPATH_STATUS_INITTED;
 995
 996                         /*
 997                          * setup to verify we get an interrupt, and fallback
 998                          * to an alternate if necessary and possible
 999                          */
1000                         if (!reinit) {
1001                                 init_timer(&dd->ipath_intrchk_timer);
1002                                 dd->ipath_intrchk_timer.function =
1003                                         verify_interrupt;
1004                                 dd->ipath_intrchk_timer.data =
1005                                         (unsigned long) dd;
1006                         }
1007                         dd->ipath_intrchk_timer.expires = jiffies + HZ/2;
1008                         add_timer(&dd->ipath_intrchk_timer);
1009                 } else
1010                         ipath_dev_err(dd, "No interrupts enabled, couldn't "
1011                                       "setup interrupt address\n");
1012
1013                 if (dd->ipath_cfgports > ipath_stats.sps_nports)
1014                         /*
1015                          * sps_nports is a global, so, we set it to
1016                          * the highest number of ports of any of the
1017                          * chips we find; we never decrement it, at
1018                          * least for now.  Since this might have changed
1019                          * over disable/enable or prior to reset, always
1020                          * do the check and potentially adjust.
1021                          */
1022                         ipath_stats.sps_nports = dd->ipath_cfgports;
1023         } else
1024                 ipath_dbg("Failed (%d) to initialize chip\n", ret);
1025
1026         /* if ret is non-zero, we probably should do some cleanup
1027            here... */
1028         return ret;
1029 }
1030
1031 static int ipath_set_kpiobufs(const char *str, struct kernel_param *kp)
1032 {
1033         struct ipath_devdata *dd;
1034         unsigned long flags;
1035         unsigned short val;
1036         int ret;
1037
1038         ret = ipath_parse_ushort(str, &val);
1039
1040         spin_lock_irqsave(&ipath_devs_lock, flags);
1041
1042         if (ret < 0)
1043                 goto bail;
1044
1045         if (val == 0) {
1046                 ret = -EINVAL;
1047                 goto bail;
1048         }
1049
1050         list_for_each_entry(dd, &ipath_dev_list, ipath_list) {
1051                 if (dd->ipath_kregbase)
1052                         continue;
1053                 if (val > (dd->ipath_piobcnt2k + dd->ipath_piobcnt4k -
1054                            (dd->ipath_cfgports *
1055                             IPATH_MIN_USER_PORT_BUFCNT)))
1056                 {
1057                         ipath_dev_err(
1058                                 dd,
1059                                 "Allocating %d PIO bufs for kernel leaves "
1060                                 "too few for %d user ports (%d each)\n",
1061                                 val, dd->ipath_cfgports - 1,
1062                                 IPATH_MIN_USER_PORT_BUFCNT);
1063                         ret = -EINVAL;
1064                         goto bail;
1065                 }
1066                 dd->ipath_lastport_piobuf =
1067                         dd->ipath_piobcnt2k + dd->ipath_piobcnt4k - val;
1068         }
1069
1070         ipath_kpiobufs = val;
1071         ret = 0;
1072 bail:
1073         spin_unlock_irqrestore(&ipath_devs_lock, flags);
1074
1075         return ret;
1076 }