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

   1 /*
   2  * Copyright (c) 2006 QLogic, Inc. 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 8
  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  * Reserved at end of buffer list.   Initialized based on
  58  * number of PIO buffers if not set via module interface.
  59  * The problem with this is that it's global, but we'll use different
  60  * numbers for different chip types.  So the default value is not
  61  * very useful.  I've redefined it for the 1.3 release so that it's
  62  * zero unless set by the user to something else, in which case we
  63  * try to respect it.
  64  */
  65 static ushort ipath_kpiobufs;
  66
  67 static int ipath_set_kpiobufs(const char *val, struct kernel_param *kp);
  68
  69 module_param_call(kpiobufs, ipath_set_kpiobufs, param_get_ushort,
  70                   &ipath_kpiobufs, S_IWUSR | S_IRUGO);
  71 MODULE_PARM_DESC(kpiobufs, "Set number of PIO buffers for driver");
  72
  73 /**
  74  * create_port0_egr - allocate the eager TID buffers
  75  * @dd: the infinipath device
  76  *
  77  * This code is now quite different for user and kernel, because
  78  * the kernel uses skb's, for the accelerated network performance.
  79  * This is the kernel (port0) version.
  80  *
  81  * Allocate the eager TID buffers and program them into infinipath.
  82  * We use the network layer alloc_skb() allocator to allocate the
  83  * memory, and either use the buffers as is for things like verbs
  84  * packets, or pass the buffers up to the ipath layered driver and
  85  * thence the network layer, replacing them as we do so (see
  86  * ipath_rcv_layer()).
  87  */
  88 static int create_port0_egr(struct ipath_devdata *dd)
  89 {
  90         unsigned e, egrcnt;
  91         struct sk_buff **skbs;
  92         int ret;
  93
  94         egrcnt = dd->ipath_rcvegrcnt;
  95
  96         skbs = vmalloc(sizeof(*dd->ipath_port0_skbs) * egrcnt);
  97         if (skbs == NULL) {
  98                 ipath_dev_err(dd, "allocation error for eager TID "
  99                               "skb array\n");
 100                 ret = -ENOMEM;
 101                 goto bail;
 102         }
 103         for (e = 0; e < egrcnt; e++) {
 104                 /*
 105                  * This is a bit tricky in that we allocate extra
 106                  * space for 2 bytes of the 14 byte ethernet header.
 107                  * These two bytes are passed in the ipath header so
 108                  * the rest of the data is word aligned.  We allocate
 109                  * 4 bytes so that the data buffer stays word aligned.
 110                  * See ipath_kreceive() for more details.
 111                  */
 112                 skbs[e] = ipath_alloc_skb(dd, GFP_KERNEL);
 113                 if (!skbs[e]) {
 114                         ipath_dev_err(dd, "SKB allocation error for "
 115                                       "eager TID %u\n", e);
 116                         while (e != 0)
 117                                 dev_kfree_skb(skbs[--e]);
 118                         vfree(skbs);
 119                         ret = -ENOMEM;
 120                         goto bail;
 121                 }
 122         }
 123         /*
 124          * After loop above, so we can test non-NULL to see if ready
 125          * to use at receive, etc.
 126          */
 127         dd->ipath_port0_skbs = skbs;
 128
 129         for (e = 0; e < egrcnt; e++) {
 130                 unsigned long phys =
 131                         virt_to_phys(dd->ipath_port0_skbs[e]->data);
 132                 dd->ipath_f_put_tid(dd, e + (u64 __iomem *)
 133                                     ((char __iomem *) dd->ipath_kregbase +
 134                                      dd->ipath_rcvegrbase), 0, 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          * Note that prior to try 14 or 15 of IB, the credit scaling
 155          * wasn't working, because it was swapped for writes with the
 156          * 1 bit default linkstate field
 157          */
 158
 159         /* ignore pbc and align word */
 160         val = dd->ipath_piosize2k - 2 * sizeof(u32);
 161         /*
 162          * for ICRC, which we only send in diag test pkt mode, and we
 163          * don't need to worry about that for mtu
 164          */
 165         val += 1;
 166         /*
 167          * Set the IBC maxpktlength to the size of our pio buffers the
 168          * maxpktlength is in words.  This is *not* the IB data MTU.
 169          */
 170         ibc = (val / sizeof(u32)) << INFINIPATH_IBCC_MAXPKTLEN_SHIFT;
 171         /* in KB */
 172         ibc |= 0x5ULL << INFINIPATH_IBCC_FLOWCTRLWATERMARK_SHIFT;
 173         /*
 174          * How often flowctrl sent.  More or less in usecs; balance against
 175          * watermark value, so that in theory senders always get a flow
 176          * control update in time to not let the IB link go idle.
 177          */
 178         ibc |= 0x3ULL << INFINIPATH_IBCC_FLOWCTRLPERIOD_SHIFT;
 179         /* max error tolerance */
 180         ibc |= 0xfULL << INFINIPATH_IBCC_PHYERRTHRESHOLD_SHIFT;
 181         /* use "real" buffer space for */
 182         ibc |= 4ULL << INFINIPATH_IBCC_CREDITSCALE_SHIFT;
 183         /* IB credit flow control. */
 184         ibc |= 0xfULL << INFINIPATH_IBCC_OVERRUNTHRESHOLD_SHIFT;
 185         /* initially come up waiting for TS1, without sending anything. */
 186         dd->ipath_ibcctrl = ibc;
 187         /*
 188          * Want to start out with both LINKCMD and LINKINITCMD in NOP
 189          * (0 and 0).  Don't put linkinitcmd in ipath_ibcctrl, want that
 190          * to stay a NOP
 191          */
 192         ibc |= INFINIPATH_IBCC_LINKINITCMD_DISABLE <<
 193                 INFINIPATH_IBCC_LINKINITCMD_SHIFT;
 194         ipath_cdbg(VERBOSE, "Writing 0x%llx to ibcctrl\n",
 195                    (unsigned long long) ibc);
 196         ipath_write_kreg(dd, dd->ipath_kregs->kr_ibcctrl, ibc);
 197
 198         // be sure chip saw it
 199         val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
 200
 201         ret = dd->ipath_f_bringup_serdes(dd);
 202
 203         if (ret)
 204                 dev_info(&dd->pcidev->dev, "Could not initialize SerDes, "
 205                          "not usable\n");
 206         else {
 207                 /* enable IBC */
 208                 dd->ipath_control |= INFINIPATH_C_LINKENABLE;
 209                 ipath_write_kreg(dd, dd->ipath_kregs->kr_control,
 210                                  dd->ipath_control);
 211         }
 212
 213         return ret;
 214 }
 215
 216 static int init_chip_first(struct ipath_devdata *dd,
 217                            struct ipath_portdata **pdp)
 218 {
 219         struct ipath_portdata *pd = NULL;
 220         int ret = 0;
 221         u64 val;
 222
 223         /*
 224          * skip cfgports stuff because we are not allocating memory,
 225          * and we don't want problems if the portcnt changed due to
 226          * cfgports.  We do still check and report a difference, if
 227          * not same (should be impossible).
 228          */
 229         dd->ipath_portcnt =
 230                 ipath_read_kreg32(dd, dd->ipath_kregs->kr_portcnt);
 231         if (!ipath_cfgports)
 232                 dd->ipath_cfgports = dd->ipath_portcnt;
 233         else if (ipath_cfgports <= dd->ipath_portcnt) {
 234                 dd->ipath_cfgports = ipath_cfgports;
 235                 ipath_dbg("Configured to use %u ports out of %u in chip\n",
 236                           dd->ipath_cfgports, dd->ipath_portcnt);
 237         } else {
 238                 dd->ipath_cfgports = dd->ipath_portcnt;
 239                 ipath_dbg("Tried to configured to use %u ports; chip "
 240                           "only supports %u\n", ipath_cfgports,
 241                           dd->ipath_portcnt);
 242         }
 243         /*
 244          * Allocate full portcnt array, rather than just cfgports, because
 245          * cleanup iterates across all possible ports.
 246          */
 247         dd->ipath_pd = kzalloc(sizeof(*dd->ipath_pd) * dd->ipath_portcnt,
 248                                GFP_KERNEL);
 249
 250         if (!dd->ipath_pd) {
 251                 ipath_dev_err(dd, "Unable to allocate portdata array, "
 252                               "failing\n");
 253                 ret = -ENOMEM;
 254                 goto done;
 255         }
 256
 257         dd->ipath_lastegrheads = kzalloc(sizeof(*dd->ipath_lastegrheads)
 258                                          * dd->ipath_cfgports,
 259                                          GFP_KERNEL);
 260         dd->ipath_lastrcvhdrqtails =
 261                 kzalloc(sizeof(*dd->ipath_lastrcvhdrqtails)
 262                         * dd->ipath_cfgports, GFP_KERNEL);
 263
 264         if (!dd->ipath_lastegrheads || !dd->ipath_lastrcvhdrqtails) {
 265                 ipath_dev_err(dd, "Unable to allocate head arrays, "
 266                               "failing\n");
 267                 ret = -ENOMEM;
 268                 goto done;
 269         }
 270
 271         dd->ipath_pd[0] = kzalloc(sizeof(*pd), GFP_KERNEL);
 272
 273         if (!dd->ipath_pd[0]) {
 274                 ipath_dev_err(dd, "Unable to allocate portdata for port "
 275                               "0, failing\n");
 276                 ret = -ENOMEM;
 277                 goto done;
 278         }
 279         pd = dd->ipath_pd[0];
 280         pd->port_dd = dd;
 281         pd->port_port = 0;
 282         pd->port_cnt = 1;
 283         /* The port 0 pkey table is used by the layer interface. */
 284         pd->port_pkeys[0] = IPATH_DEFAULT_P_KEY;
 285         dd->ipath_rcvtidcnt =
 286                 ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvtidcnt);
 287         dd->ipath_rcvtidbase =
 288                 ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvtidbase);
 289         dd->ipath_rcvegrcnt =
 290                 ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvegrcnt);
 291         dd->ipath_rcvegrbase =
 292                 ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvegrbase);
 293         dd->ipath_palign =
 294                 ipath_read_kreg32(dd, dd->ipath_kregs->kr_pagealign);
 295         dd->ipath_piobufbase =
 296                 ipath_read_kreg64(dd, dd->ipath_kregs->kr_sendpiobufbase);
 297         val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_sendpiosize);
 298         dd->ipath_piosize2k = val & ~0U;
 299         dd->ipath_piosize4k = val >> 32;
 300         dd->ipath_ibmtu = 4096; /* default to largest legal MTU */
 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         spin_lock_init(&dd->ipath_tid_lock);
 329
 330 done:
 331         *pdp = pd;
 332         return ret;
 333 }
 334
 335 /**
 336  * init_chip_reset - re-initialize after a reset, or enable
 337  * @dd: the infinipath device
 338  * @pdp: output for port data
 339  *
 340  * sanity check at least some of the values after reset, and
 341  * ensure no receive or transmit (explictly, in case reset
 342  * failed
 343  */
 344 static int init_chip_reset(struct ipath_devdata *dd,
 345                            struct ipath_portdata **pdp)
 346 {
 347         struct ipath_portdata *pd;
 348         u32 rtmp;
 349
 350         *pdp = pd = dd->ipath_pd[0];
 351         /* ensure chip does no sends or receives while we re-initialize */
 352         dd->ipath_control = dd->ipath_sendctrl = dd->ipath_rcvctrl = 0U;
 353         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl, 0);
 354         ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl, 0);
 355         ipath_write_kreg(dd, dd->ipath_kregs->kr_control, 0);
 356
 357         rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_portcnt);
 358         if (dd->ipath_portcnt != rtmp)
 359                 dev_info(&dd->pcidev->dev, "portcnt was %u before "
 360                          "reset, now %u, using original\n",
 361                          dd->ipath_portcnt, rtmp);
 362         rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvtidcnt);
 363         if (rtmp != dd->ipath_rcvtidcnt)
 364                 dev_info(&dd->pcidev->dev, "tidcnt was %u before "
 365                          "reset, now %u, using original\n",
 366                          dd->ipath_rcvtidcnt, rtmp);
 367         rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvtidbase);
 368         if (rtmp != dd->ipath_rcvtidbase)
 369                 dev_info(&dd->pcidev->dev, "tidbase was %u before "
 370                          "reset, now %u, using original\n",
 371                          dd->ipath_rcvtidbase, rtmp);
 372         rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvegrcnt);
 373         if (rtmp != dd->ipath_rcvegrcnt)
 374                 dev_info(&dd->pcidev->dev, "egrcnt was %u before "
 375                          "reset, now %u, using original\n",
 376                          dd->ipath_rcvegrcnt, rtmp);
 377         rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvegrbase);
 378         if (rtmp != dd->ipath_rcvegrbase)
 379                 dev_info(&dd->pcidev->dev, "egrbase was %u before "
 380                          "reset, now %u, using original\n",
 381                          dd->ipath_rcvegrbase, rtmp);
 382
 383         return 0;
 384 }
 385
 386 static int init_pioavailregs(struct ipath_devdata *dd)
 387 {
 388         int ret;
 389
 390         dd->ipath_pioavailregs_dma = dma_alloc_coherent(
 391                 &dd->pcidev->dev, PAGE_SIZE, &dd->ipath_pioavailregs_phys,
 392                 GFP_KERNEL);
 393         if (!dd->ipath_pioavailregs_dma) {
 394                 ipath_dev_err(dd, "failed to allocate PIOavail reg area "
 395                               "in memory\n");
 396                 ret = -ENOMEM;
 397                 goto done;
 398         }
 399
 400         /*
 401          * we really want L2 cache aligned, but for current CPUs of
 402          * interest, they are the same.
 403          */
 404         dd->ipath_statusp = (u64 *)
 405                 ((char *)dd->ipath_pioavailregs_dma +
 406                  ((2 * L1_CACHE_BYTES +
 407                    dd->ipath_pioavregs * sizeof(u64)) & ~L1_CACHE_BYTES));
 408         /* copy the current value now that it's really allocated */
 409         *dd->ipath_statusp = dd->_ipath_status;
 410         /*
 411          * setup buffer to hold freeze msg, accessible to apps,
 412          * following statusp
 413          */
 414         dd->ipath_freezemsg = (char *)&dd->ipath_statusp[1];
 415         /* and its length */
 416         dd->ipath_freezelen = L1_CACHE_BYTES - sizeof(dd->ipath_statusp[0]);
 417
 418         ret = 0;
 419
 420 done:
 421         return ret;
 422 }
 423
 424 /**
 425  * init_shadow_tids - allocate the shadow TID array
 426  * @dd: the infinipath device
 427  *
 428  * allocate the shadow TID array, so we can ipath_munlock previous
 429  * entries.  It may make more sense to move the pageshadow to the
 430  * port data structure, so we only allocate memory for ports actually
 431  * in use, since we at 8k per port, now.
 432  */
 433 static void init_shadow_tids(struct ipath_devdata *dd)
 434 {
 435         dd->ipath_pageshadow = (struct page **)
 436                 vmalloc(dd->ipath_cfgports * dd->ipath_rcvtidcnt *
 437                         sizeof(struct page *));
 438         if (!dd->ipath_pageshadow)
 439                 ipath_dev_err(dd, "failed to allocate shadow page * "
 440                               "array, no expected sends!\n");
 441         else
 442                 memset(dd->ipath_pageshadow, 0,
 443                        dd->ipath_cfgports * dd->ipath_rcvtidcnt *
 444                        sizeof(struct page *));
 445 }
 446
 447 static void enable_chip(struct ipath_devdata *dd,
 448                         struct ipath_portdata *pd, int reinit)
 449 {
 450         u32 val;
 451         int i;
 452
 453         if (!reinit)
 454                 init_waitqueue_head(&ipath_state_wait);
 455
 456         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
 457                          dd->ipath_rcvctrl);
 458
 459         /* Enable PIO send, and update of PIOavail regs to memory. */
 460         dd->ipath_sendctrl = INFINIPATH_S_PIOENABLE |
 461                 INFINIPATH_S_PIOBUFAVAILUPD;
 462         ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
 463                          dd->ipath_sendctrl);
 464
 465         /*
 466          * enable port 0 receive, and receive interrupt.  other ports
 467          * done as user opens and inits them.
 468          */
 469         dd->ipath_rcvctrl = INFINIPATH_R_TAILUPD |
 470                 (1ULL << INFINIPATH_R_PORTENABLE_SHIFT) |
 471                 (1ULL << INFINIPATH_R_INTRAVAIL_SHIFT);
 472         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
 473                          dd->ipath_rcvctrl);
 474
 475         /*
 476          * now ready for use.  this should be cleared whenever we
 477          * detect a reset, or initiate one.
 478          */
 479         dd->ipath_flags |= IPATH_INITTED;
 480
 481         /*
 482          * init our shadow copies of head from tail values, and write
 483          * head values to match.
 484          */
 485         val = ipath_read_ureg32(dd, ur_rcvegrindextail, 0);
 486         (void)ipath_write_ureg(dd, ur_rcvegrindexhead, val, 0);
 487         dd->ipath_port0head = ipath_read_ureg32(dd, ur_rcvhdrtail, 0);
 488
 489         /* Initialize so we interrupt on next packet received */
 490         (void)ipath_write_ureg(dd, ur_rcvhdrhead,
 491                                dd->ipath_rhdrhead_intr_off |
 492                                dd->ipath_port0head, 0);
 493
 494         /*
 495          * by now pioavail updates to memory should have occurred, so
 496          * copy them into our working/shadow registers; this is in
 497          * case something went wrong with abort, but mostly to get the
 498          * initial values of the generation bit correct.
 499          */
 500         for (i = 0; i < dd->ipath_pioavregs; i++) {
 501                 __le64 val;
 502
 503                 /*
 504                  * Chip Errata bug 6641; even and odd qwords>3 are swapped.
 505                  */
 506                 if (i > 3) {
 507                         if (i & 1)
 508                                 val = dd->ipath_pioavailregs_dma[i - 1];
 509                         else
 510                                 val = dd->ipath_pioavailregs_dma[i + 1];
 511                 }
 512                 else
 513                         val = dd->ipath_pioavailregs_dma[i];
 514                 dd->ipath_pioavailshadow[i] = le64_to_cpu(val);
 515         }
 516         /* can get counters, stats, etc. */
 517         dd->ipath_flags |= IPATH_PRESENT;
 518 }
 519
 520 static int init_housekeeping(struct ipath_devdata *dd,
 521                              struct ipath_portdata **pdp, int reinit)
 522 {
 523         char boardn[32];
 524         int ret = 0;
 525
 526         /*
 527          * have to clear shadow copies of registers at init that are
 528          * not otherwise set here, or all kinds of bizarre things
 529          * happen with driver on chip reset
 530          */
 531         dd->ipath_rcvhdrsize = 0;
 532
 533         /*
 534          * Don't clear ipath_flags as 8bit mode was set before
 535          * entering this func. However, we do set the linkstate to
 536          * unknown, so we can watch for a transition.
 537          * PRESENT is set because we want register reads to work,
 538          * and the kernel infrastructure saw it in config space;
 539          * We clear it if we have failures.
 540          */
 541         dd->ipath_flags |= IPATH_LINKUNK | IPATH_PRESENT;
 542         dd->ipath_flags &= ~(IPATH_LINKACTIVE | IPATH_LINKARMED |
 543                              IPATH_LINKDOWN | IPATH_LINKINIT);
 544
 545         ipath_cdbg(VERBOSE, "Try to read spc chip revision\n");
 546         dd->ipath_revision =
 547                 ipath_read_kreg64(dd, dd->ipath_kregs->kr_revision);
 548
 549         /*
 550          * set up fundamental info we need to use the chip; we assume
 551          * if the revision reg and these regs are OK, we don't need to
 552          * special case the rest
 553          */
 554         dd->ipath_sregbase =
 555                 ipath_read_kreg32(dd, dd->ipath_kregs->kr_sendregbase);
 556         dd->ipath_cregbase =
 557                 ipath_read_kreg32(dd, dd->ipath_kregs->kr_counterregbase);
 558         dd->ipath_uregbase =
 559                 ipath_read_kreg32(dd, dd->ipath_kregs->kr_userregbase);
 560         ipath_cdbg(VERBOSE, "ipath_kregbase %p, sendbase %x usrbase %x, "
 561                    "cntrbase %x\n", dd->ipath_kregbase, dd->ipath_sregbase,
 562                    dd->ipath_uregbase, dd->ipath_cregbase);
 563         if ((dd->ipath_revision & 0xffffffff) == 0xffffffff
 564             || (dd->ipath_sregbase & 0xffffffff) == 0xffffffff
 565             || (dd->ipath_cregbase & 0xffffffff) == 0xffffffff
 566             || (dd->ipath_uregbase & 0xffffffff) == 0xffffffff) {
 567                 ipath_dev_err(dd, "Register read failures from chip, "
 568                               "giving up initialization\n");
 569                 dd->ipath_flags &= ~IPATH_PRESENT;
 570                 ret = -ENODEV;
 571                 goto done;
 572         }
 573
 574         /* clear the initial reset flag, in case first driver load */
 575         ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear,
 576                          INFINIPATH_E_RESET);
 577
 578         if (reinit)
 579                 ret = init_chip_reset(dd, pdp);
 580         else
 581                 ret = init_chip_first(dd, pdp);
 582
 583         if (ret)
 584                 goto done;
 585
 586         ipath_cdbg(VERBOSE, "Revision %llx (PCI %x), %u ports, %u tids, "
 587                    "%u egrtids\n", (unsigned long long) dd->ipath_revision,
 588                    dd->ipath_pcirev, dd->ipath_portcnt, dd->ipath_rcvtidcnt,
 589                    dd->ipath_rcvegrcnt);
 590
 591         if (((dd->ipath_revision >> INFINIPATH_R_SOFTWARE_SHIFT) &
 592              INFINIPATH_R_SOFTWARE_MASK) != IPATH_CHIP_SWVERSION) {
 593                 ipath_dev_err(dd, "Driver only handles version %d, "
 594                               "chip swversion is %d (%llx), failng\n",
 595                               IPATH_CHIP_SWVERSION,
 596                               (int)(dd->ipath_revision >>
 597                                     INFINIPATH_R_SOFTWARE_SHIFT) &
 598                               INFINIPATH_R_SOFTWARE_MASK,
 599                               (unsigned long long) dd->ipath_revision);
 600                 ret = -ENOSYS;
 601                 goto done;
 602         }
 603         dd->ipath_majrev = (u8) ((dd->ipath_revision >>
 604                                   INFINIPATH_R_CHIPREVMAJOR_SHIFT) &
 605                                  INFINIPATH_R_CHIPREVMAJOR_MASK);
 606         dd->ipath_minrev = (u8) ((dd->ipath_revision >>
 607                                   INFINIPATH_R_CHIPREVMINOR_SHIFT) &
 608                                  INFINIPATH_R_CHIPREVMINOR_MASK);
 609         dd->ipath_boardrev = (u8) ((dd->ipath_revision >>
 610                                     INFINIPATH_R_BOARDID_SHIFT) &
 611                                    INFINIPATH_R_BOARDID_MASK);
 612
 613         ret = dd->ipath_f_get_boardname(dd, boardn, sizeof boardn);
 614
 615         snprintf(dd->ipath_boardversion, sizeof(dd->ipath_boardversion),
 616                  "Driver %u.%u, %s, InfiniPath%u %u.%u, PCI %u, "
 617                  "SW Compat %u\n",
 618                  IPATH_CHIP_VERS_MAJ, IPATH_CHIP_VERS_MIN, boardn,
 619                  (unsigned)(dd->ipath_revision >> INFINIPATH_R_ARCH_SHIFT) &
 620                  INFINIPATH_R_ARCH_MASK,
 621                  dd->ipath_majrev, dd->ipath_minrev, dd->ipath_pcirev,
 622                  (unsigned)(dd->ipath_revision >>
 623                             INFINIPATH_R_SOFTWARE_SHIFT) &
 624                  INFINIPATH_R_SOFTWARE_MASK);
 625
 626         ipath_dbg("%s", dd->ipath_boardversion);
 627
 628 done:
 629         return ret;
 630 }
 631
 632
 633 /**
 634  * ipath_init_chip - do the actual initialization sequence on the chip
 635  * @dd: the infinipath device
 636  * @reinit: reinitializing, so don't allocate new memory
 637  *
 638  * Do the actual initialization sequence on the chip.  This is done
 639  * both from the init routine called from the PCI infrastructure, and
 640  * when we reset the chip, or detect that it was reset internally,
 641  * or it's administratively re-enabled.
 642  *
 643  * Memory allocation here and in called routines is only done in
 644  * the first case (reinit == 0).  We have to be careful, because even
 645  * without memory allocation, we need to re-write all the chip registers
 646  * TIDs, etc. after the reset or enable has completed.
 647  */
 648 int ipath_init_chip(struct ipath_devdata *dd, int reinit)
 649 {
 650         int ret = 0, i;
 651         u32 val32, kpiobufs;
 652         u64 val;
 653         struct ipath_portdata *pd = NULL; /* keep gcc4 happy */
 654         gfp_t gfp_flags = GFP_USER | __GFP_COMP;
 655
 656         ret = init_housekeeping(dd, &pd, reinit);
 657         if (ret)
 658                 goto done;
 659
 660         /*
 661          * we ignore most issues after reporting them, but have to specially
 662          * handle hardware-disabled chips.
 663          */
 664         if (ret == 2) {
 665                 /* unique error, known to ipath_init_one */
 666                 ret = -EPERM;
 667                 goto done;
 668         }
 669
 670         /*
 671          * We could bump this to allow for full rcvegrcnt + rcvtidcnt,
 672          * but then it no longer nicely fits power of two, and since
 673          * we now use routines that backend onto __get_free_pages, the
 674          * rest would be wasted.
 675          */
 676         dd->ipath_rcvhdrcnt = dd->ipath_rcvegrcnt;
 677         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvhdrcnt,
 678                          dd->ipath_rcvhdrcnt);
 679
 680         /*
 681          * Set up the shadow copies of the piobufavail registers,
 682          * which we compare against the chip registers for now, and
 683          * the in memory DMA'ed copies of the registers.  This has to
 684          * be done early, before we calculate lastport, etc.
 685          */
 686         val = dd->ipath_piobcnt2k + dd->ipath_piobcnt4k;
 687         /*
 688          * calc number of pioavail registers, and save it; we have 2
 689          * bits per buffer.
 690          */
 691         dd->ipath_pioavregs = ALIGN(val, sizeof(u64) * BITS_PER_BYTE / 2)
 692                 / (sizeof(u64) * BITS_PER_BYTE / 2);
 693         if (ipath_kpiobufs == 0) {
 694                 /* not set by user (this is default) */
 695                 if ((dd->ipath_piobcnt2k + dd->ipath_piobcnt4k) > 128)
 696                         kpiobufs = 32;
 697                 else
 698                         kpiobufs = 16;
 699         }
 700         else
 701                 kpiobufs = ipath_kpiobufs;
 702
 703         if (kpiobufs >
 704             (dd->ipath_piobcnt2k + dd->ipath_piobcnt4k -
 705              (dd->ipath_cfgports * IPATH_MIN_USER_PORT_BUFCNT))) {
 706                 i = dd->ipath_piobcnt2k + dd->ipath_piobcnt4k -
 707                         (dd->ipath_cfgports * IPATH_MIN_USER_PORT_BUFCNT);
 708                 if (i < 0)
 709                         i = 0;
 710                 dev_info(&dd->pcidev->dev, "Allocating %d PIO bufs for "
 711                          "kernel leaves too few for %d user ports "
 712                          "(%d each); using %u\n", kpiobufs,
 713                          dd->ipath_cfgports - 1,
 714                          IPATH_MIN_USER_PORT_BUFCNT, i);
 715                 /*
 716                  * shouldn't change ipath_kpiobufs, because could be
 717                  * different for different devices...
 718                  */
 719                 kpiobufs = i;
 720         }
 721         dd->ipath_lastport_piobuf =
 722                 dd->ipath_piobcnt2k + dd->ipath_piobcnt4k - kpiobufs;
 723         dd->ipath_pbufsport = dd->ipath_cfgports > 1
 724                 ? dd->ipath_lastport_piobuf / (dd->ipath_cfgports - 1)
 725                 : 0;
 726         val32 = dd->ipath_lastport_piobuf -
 727                 (dd->ipath_pbufsport * (dd->ipath_cfgports - 1));
 728         if (val32 > 0) {
 729                 ipath_dbg("allocating %u pbufs/port leaves %u unused, "
 730                           "add to kernel\n", dd->ipath_pbufsport, val32);
 731                 dd->ipath_lastport_piobuf -= val32;
 732                 ipath_dbg("%u pbufs/port leaves %u unused, add to kernel\n",
 733                           dd->ipath_pbufsport, val32);
 734         }
 735         dd->ipath_lastpioindex = dd->ipath_lastport_piobuf;
 736         ipath_cdbg(VERBOSE, "%d PIO bufs for kernel out of %d total %u "
 737                    "each for %u user ports\n", kpiobufs,
 738                    dd->ipath_piobcnt2k + dd->ipath_piobcnt4k,
 739                    dd->ipath_pbufsport, dd->ipath_cfgports - 1);
 740
 741         dd->ipath_f_early_init(dd);
 742
 743         /* early_init sets rcvhdrentsize and rcvhdrsize, so this must be
 744          * done after early_init */
 745         dd->ipath_hdrqlast =
 746                 dd->ipath_rcvhdrentsize * (dd->ipath_rcvhdrcnt - 1);
 747         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvhdrentsize,
 748                          dd->ipath_rcvhdrentsize);
 749         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvhdrsize,
 750                          dd->ipath_rcvhdrsize);
 751
 752         if (!reinit) {
 753                 ret = init_pioavailregs(dd);
 754                 init_shadow_tids(dd);
 755                 if (ret)
 756                         goto done;
 757         }
 758
 759         (void)ipath_write_kreg(dd, dd->ipath_kregs->kr_sendpioavailaddr,
 760                                dd->ipath_pioavailregs_phys);
 761         /*
 762          * this is to detect s/w errors, which the h/w works around by
 763          * ignoring the low 6 bits of address, if it wasn't aligned.
 764          */
 765         val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_sendpioavailaddr);
 766         if (val != dd->ipath_pioavailregs_phys) {
 767                 ipath_dev_err(dd, "Catastrophic software error, "
 768                               "SendPIOAvailAddr written as %lx, "
 769                               "read back as %llx\n",
 770                               (unsigned long) dd->ipath_pioavailregs_phys,
 771                               (unsigned long long) val);
 772                 ret = -EINVAL;
 773                 goto done;
 774         }
 775
 776         ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvbthqp, IPATH_KD_QP);
 777
 778         /*
 779          * make sure we are not in freeze, and PIO send enabled, so
 780          * writes to pbc happen
 781          */
 782         ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrmask, 0ULL);
 783         ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrclear,
 784                          ~0ULL&~INFINIPATH_HWE_MEMBISTFAILED);
 785         ipath_write_kreg(dd, dd->ipath_kregs->kr_control, 0ULL);
 786         ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
 787                          INFINIPATH_S_PIOENABLE);
 788
 789         /*
 790          * before error clears, since we expect serdes pll errors during
 791          * this, the first time after reset
 792          */
 793         if (bringup_link(dd)) {
 794                 dev_info(&dd->pcidev->dev, "Failed to bringup IB link\n");
 795                 ret = -ENETDOWN;
 796                 goto done;
 797         }
 798
 799         /*
 800          * clear any "expected" hwerrs from reset and/or initialization
 801          * clear any that aren't enabled (at least this once), and then
 802          * set the enable mask
 803          */
 804         dd->ipath_f_init_hwerrors(dd);
 805         ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrclear,
 806                          ~0ULL&~INFINIPATH_HWE_MEMBISTFAILED);
 807         ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrmask,
 808                          dd->ipath_hwerrmask);
 809
 810         dd->ipath_maskederrs = dd->ipath_ignorederrs;
 811         /* clear all */
 812         ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear, -1LL);
 813         /* enable errors that are masked, at least this first time. */
 814         ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
 815                          ~dd->ipath_maskederrs);
 816         /* clear any interrups up to this point (ints still not enabled) */
 817         ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, -1LL);
 818
 819         /*
 820          * Set up the port 0 (kernel) rcvhdr q and egr TIDs.  If doing
 821          * re-init, the simplest way to handle this is to free
 822          * existing, and re-allocate.
 823          */
 824         if (reinit) {
 825                 struct ipath_portdata *pd = dd->ipath_pd[0];
 826                 dd->ipath_pd[0] = NULL;
 827                 ipath_free_pddata(dd, pd);
 828         }
 829         dd->ipath_f_tidtemplate(dd);
 830         ret = ipath_create_rcvhdrq(dd, pd);
 831         if (!ret) {
 832                 dd->ipath_hdrqtailptr =
 833                         (volatile __le64 *)pd->port_rcvhdrtail_kvaddr;
 834                 ret = create_port0_egr(dd);
 835         }
 836         if (ret)
 837                 ipath_dev_err(dd, "failed to allocate port 0 (kernel) "
 838                               "rcvhdrq and/or egr bufs\n");
 839         else
 840                 enable_chip(dd, pd, reinit);
 841
 842
 843         if (!ret && !reinit) {
 844             /* used when we close a port, for DMA already in flight at close */
 845                 dd->ipath_dummy_hdrq = dma_alloc_coherent(
 846                         &dd->pcidev->dev, pd->port_rcvhdrq_size,
 847                         &dd->ipath_dummy_hdrq_phys,
 848                         gfp_flags);
 849                 if (!dd->ipath_dummy_hdrq ) {
 850                         dev_info(&dd->pcidev->dev,
 851                                 "Couldn't allocate 0x%lx bytes for dummy hdrq\n",
 852                                 pd->port_rcvhdrq_size);
 853                         /* fallback to just 0'ing */
 854                         dd->ipath_dummy_hdrq_phys = 0UL;
 855                 }
 856         }
 857
 858         /*
 859          * cause retrigger of pending interrupts ignored during init,
 860          * even if we had errors
 861          */
 862         ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, 0ULL);
 863
 864         if(!dd->ipath_stats_timer_active) {
 865                 /*
 866                  * first init, or after an admin disable/enable
 867                  * set up stats retrieval timer, even if we had errors
 868                  * in last portion of setup
 869                  */
 870                 init_timer(&dd->ipath_stats_timer);
 871                 dd->ipath_stats_timer.function = ipath_get_faststats;
 872                 dd->ipath_stats_timer.data = (unsigned long) dd;
 873                 /* every 5 seconds; */
 874                 dd->ipath_stats_timer.expires = jiffies + 5 * HZ;
 875                 /* takes ~16 seconds to overflow at full IB 4x bandwdith */
 876                 add_timer(&dd->ipath_stats_timer);
 877                 dd->ipath_stats_timer_active = 1;
 878         }
 879
 880 done:
 881         if (!ret) {
 882                 *dd->ipath_statusp |= IPATH_STATUS_CHIP_PRESENT;
 883                 if (!dd->ipath_f_intrsetup(dd)) {
 884                         /* now we can enable all interrupts from the chip */
 885                         ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask,
 886                                          -1LL);
 887                         /* force re-interrupt of any pending interrupts. */
 888                         ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear,
 889                                          0ULL);
 890                         /* chip is usable; mark it as initialized */
 891                         *dd->ipath_statusp |= IPATH_STATUS_INITTED;
 892                 } else
 893                         ipath_dev_err(dd, "No interrupts enabled, couldn't "
 894                                       "setup interrupt address\n");
 895
 896                 if (dd->ipath_cfgports > ipath_stats.sps_nports)
 897                         /*
 898                          * sps_nports is a global, so, we set it to
 899                          * the highest number of ports of any of the
 900                          * chips we find; we never decrement it, at
 901                          * least for now.  Since this might have changed
 902                          * over disable/enable or prior to reset, always
 903                          * do the check and potentially adjust.
 904                          */
 905                         ipath_stats.sps_nports = dd->ipath_cfgports;
 906         } else
 907                 ipath_dbg("Failed (%d) to initialize chip\n", ret);
 908
 909         /* if ret is non-zero, we probably should do some cleanup
 910            here... */
 911         return ret;
 912 }
 913
 914 static int ipath_set_kpiobufs(const char *str, struct kernel_param *kp)
 915 {
 916         struct ipath_devdata *dd;
 917         unsigned long flags;
 918         unsigned short val;
 919         int ret;
 920
 921         ret = ipath_parse_ushort(str, &val);
 922
 923         spin_lock_irqsave(&ipath_devs_lock, flags);
 924
 925         if (ret < 0)
 926                 goto bail;
 927
 928         if (val == 0) {
 929                 ret = -EINVAL;
 930                 goto bail;
 931         }
 932
 933         list_for_each_entry(dd, &ipath_dev_list, ipath_list) {
 934                 if (dd->ipath_kregbase)
 935                         continue;
 936                 if (val > (dd->ipath_piobcnt2k + dd->ipath_piobcnt4k -
 937                            (dd->ipath_cfgports *
 938                             IPATH_MIN_USER_PORT_BUFCNT)))
 939                 {
 940                         ipath_dev_err(
 941                                 dd,
 942                                 "Allocating %d PIO bufs for kernel leaves "
 943                                 "too few for %d user ports (%d each)\n",
 944                                 val, dd->ipath_cfgports - 1,
 945                                 IPATH_MIN_USER_PORT_BUFCNT);
 946                         ret = -EINVAL;
 947                         goto bail;
 948                 }
 949                 dd->ipath_lastport_piobuf =
 950                         dd->ipath_piobcnt2k + dd->ipath_piobcnt4k - val;
 951         }
 952
 953         ipath_kpiobufs = val;
 954         ret = 0;
 955 bail:
 956         spin_unlock_irqrestore(&ipath_devs_lock, flags);
 957
 958         return ret;
 959 }