drivers/scsi/snic/vnic_dev.c

   1 /*
   2  * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
   3  *
   4  * This program is free software; you may redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   9  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  10  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  11  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  12  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  13  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  14  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  15  * SOFTWARE.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/errno.h>
  20 #include <linux/types.h>
  21 #include <linux/pci.h>
  22 #include <linux/delay.h>
  23 #include <linux/if_ether.h>
  24 #include <linux/slab.h>
  25 #include "vnic_resource.h"
  26 #include "vnic_devcmd.h"
  27 #include "vnic_dev.h"
  28 #include "vnic_stats.h"
  29 #include "vnic_wq.h"
  30
  31 #define VNIC_DVCMD_TMO  10000   /* Devcmd Timeout value */
  32 #define VNIC_NOTIFY_INTR_MASK 0x0000ffff00000000ULL
  33
  34 struct devcmd2_controller {
  35         struct vnic_wq_ctrl __iomem *wq_ctrl;
  36         struct vnic_dev_ring results_ring;
  37         struct vnic_wq wq;
  38         struct vnic_devcmd2 *cmd_ring;
  39         struct devcmd2_result *result;
  40         u16 next_result;
  41         u16 result_size;
  42         int color;
  43 };
  44
  45 struct vnic_res {
  46         void __iomem *vaddr;
  47         unsigned int count;
  48 };
  49
  50 struct vnic_dev {
  51         void *priv;
  52         struct pci_dev *pdev;
  53         struct vnic_res res[RES_TYPE_MAX];
  54         enum vnic_dev_intr_mode intr_mode;
  55         struct vnic_devcmd __iomem *devcmd;
  56         struct vnic_devcmd_notify *notify;
  57         struct vnic_devcmd_notify notify_copy;
  58         dma_addr_t notify_pa;
  59         u32 *linkstatus;
  60         dma_addr_t linkstatus_pa;
  61         struct vnic_stats *stats;
  62         dma_addr_t stats_pa;
  63         struct vnic_devcmd_fw_info *fw_info;
  64         dma_addr_t fw_info_pa;
  65         u64 args[VNIC_DEVCMD_NARGS];
  66         struct devcmd2_controller *devcmd2;
  67
  68         int (*devcmd_rtn)(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
  69                           int wait);
  70 };
  71
  72 #define VNIC_MAX_RES_HDR_SIZE \
  73         (sizeof(struct vnic_resource_header) + \
  74         sizeof(struct vnic_resource) * RES_TYPE_MAX)
  75 #define VNIC_RES_STRIDE 128
  76
  77 void *svnic_dev_priv(struct vnic_dev *vdev)
  78 {
  79         return vdev->priv;
  80 }
  81
  82 static int vnic_dev_discover_res(struct vnic_dev *vdev,
  83         struct vnic_dev_bar *bar, unsigned int num_bars)
  84 {
  85         struct vnic_resource_header __iomem *rh;
  86         struct vnic_resource __iomem *r;
  87         u8 type;
  88
  89         if (num_bars == 0)
  90                 return -EINVAL;
  91
  92         if (bar->len < VNIC_MAX_RES_HDR_SIZE) {
  93                 pr_err("vNIC BAR0 res hdr length error\n");
  94
  95                 return -EINVAL;
  96         }
  97
  98         rh = bar->vaddr;
  99         if (!rh) {
 100                 pr_err("vNIC BAR0 res hdr not mem-mapped\n");
 101
 102                 return -EINVAL;
 103         }
 104
 105         if (ioread32(&rh->magic) != VNIC_RES_MAGIC ||
 106             ioread32(&rh->version) != VNIC_RES_VERSION) {
 107                 pr_err("vNIC BAR0 res magic/version error exp (%lx/%lx) curr (%x/%x)\n",
 108                         VNIC_RES_MAGIC, VNIC_RES_VERSION,
 109                         ioread32(&rh->magic), ioread32(&rh->version));
 110
 111                 return -EINVAL;
 112         }
 113
 114         r = (struct vnic_resource __iomem *)(rh + 1);
 115
 116         while ((type = ioread8(&r->type)) != RES_TYPE_EOL) {
 117
 118                 u8 bar_num = ioread8(&r->bar);
 119                 u32 bar_offset = ioread32(&r->bar_offset);
 120                 u32 count = ioread32(&r->count);
 121                 u32 len;
 122
 123                 r++;
 124
 125                 if (bar_num >= num_bars)
 126                         continue;
 127
 128                 if (!bar[bar_num].len || !bar[bar_num].vaddr)
 129                         continue;
 130
 131                 switch (type) {
 132                 case RES_TYPE_WQ:
 133                 case RES_TYPE_RQ:
 134                 case RES_TYPE_CQ:
 135                 case RES_TYPE_INTR_CTRL:
 136                         /* each count is stride bytes long */
 137                         len = count * VNIC_RES_STRIDE;
 138                         if (len + bar_offset > bar->len) {
 139                                 pr_err("vNIC BAR0 resource %d out-of-bounds, offset 0x%x + size 0x%x > bar len 0x%lx\n",
 140                                         type, bar_offset,
 141                                         len,
 142                                         bar->len);
 143
 144                                 return -EINVAL;
 145                         }
 146                         break;
 147
 148                 case RES_TYPE_INTR_PBA_LEGACY:
 149                 case RES_TYPE_DEVCMD:
 150                 case RES_TYPE_DEVCMD2:
 151                         len = count;
 152                         break;
 153
 154                 default:
 155                         continue;
 156                 }
 157
 158                 vdev->res[type].count = count;
 159                 vdev->res[type].vaddr = (char __iomem *)bar->vaddr + bar_offset;
 160         }
 161
 162         return 0;
 163 }
 164
 165 unsigned int svnic_dev_get_res_count(struct vnic_dev *vdev,
 166         enum vnic_res_type type)
 167 {
 168         return vdev->res[type].count;
 169 }
 170
 171 void __iomem *svnic_dev_get_res(struct vnic_dev *vdev, enum vnic_res_type type,
 172         unsigned int index)
 173 {
 174         if (!vdev->res[type].vaddr)
 175                 return NULL;
 176
 177         switch (type) {
 178         case RES_TYPE_WQ:
 179         case RES_TYPE_RQ:
 180         case RES_TYPE_CQ:
 181         case RES_TYPE_INTR_CTRL:
 182                 return (char __iomem *)vdev->res[type].vaddr +
 183                                         index * VNIC_RES_STRIDE;
 184
 185         default:
 186                 return (char __iomem *)vdev->res[type].vaddr;
 187         }
 188 }
 189
 190 unsigned int svnic_dev_desc_ring_size(struct vnic_dev_ring *ring,
 191                                       unsigned int desc_count,
 192                                       unsigned int desc_size)
 193 {
 194         /* The base address of the desc rings must be 512 byte aligned.
 195          * Descriptor count is aligned to groups of 32 descriptors.  A
 196          * count of 0 means the maximum 4096 descriptors.  Descriptor
 197          * size is aligned to 16 bytes.
 198          */
 199
 200         unsigned int count_align = 32;
 201         unsigned int desc_align = 16;
 202
 203         ring->base_align = 512;
 204
 205         if (desc_count == 0)
 206                 desc_count = 4096;
 207
 208         ring->desc_count = ALIGN(desc_count, count_align);
 209
 210         ring->desc_size = ALIGN(desc_size, desc_align);
 211
 212         ring->size = ring->desc_count * ring->desc_size;
 213         ring->size_unaligned = ring->size + ring->base_align;
 214
 215         return ring->size_unaligned;
 216 }
 217
 218 void svnic_dev_clear_desc_ring(struct vnic_dev_ring *ring)
 219 {
 220         memset(ring->descs, 0, ring->size);
 221 }
 222
 223 int svnic_dev_alloc_desc_ring(struct vnic_dev *vdev, struct vnic_dev_ring *ring,
 224         unsigned int desc_count, unsigned int desc_size)
 225 {
 226         svnic_dev_desc_ring_size(ring, desc_count, desc_size);
 227
 228         ring->descs_unaligned = pci_alloc_consistent(vdev->pdev,
 229                 ring->size_unaligned,
 230                 &ring->base_addr_unaligned);
 231
 232         if (!ring->descs_unaligned) {
 233                 pr_err("Failed to allocate ring (size=%d), aborting\n",
 234                         (int)ring->size);
 235
 236                 return -ENOMEM;
 237         }
 238
 239         ring->base_addr = ALIGN(ring->base_addr_unaligned,
 240                 ring->base_align);
 241         ring->descs = (u8 *)ring->descs_unaligned +
 242                 (ring->base_addr - ring->base_addr_unaligned);
 243
 244         svnic_dev_clear_desc_ring(ring);
 245
 246         ring->desc_avail = ring->desc_count - 1;
 247
 248         return 0;
 249 }
 250
 251 void svnic_dev_free_desc_ring(struct vnic_dev *vdev, struct vnic_dev_ring *ring)
 252 {
 253         if (ring->descs) {
 254                 pci_free_consistent(vdev->pdev,
 255                         ring->size_unaligned,
 256                         ring->descs_unaligned,
 257                         ring->base_addr_unaligned);
 258                 ring->descs = NULL;
 259         }
 260 }
 261
 262 static int _svnic_dev_cmd2(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
 263         int wait)
 264 {
 265         struct devcmd2_controller *dc2c = vdev->devcmd2;
 266         struct devcmd2_result *result = dc2c->result + dc2c->next_result;
 267         unsigned int i;
 268         int delay;
 269         int err;
 270         u32 posted;
 271         u32 new_posted;
 272
 273         posted = ioread32(&dc2c->wq_ctrl->posted_index);
 274
 275         if (posted == 0xFFFFFFFF) { /* check for hardware gone  */
 276                 /* Hardware surprise removal: return error */
 277                 return -ENODEV;
 278         }
 279
 280         new_posted = (posted + 1) % DEVCMD2_RING_SIZE;
 281         dc2c->cmd_ring[posted].cmd = cmd;
 282         dc2c->cmd_ring[posted].flags = 0;
 283
 284         if ((_CMD_FLAGS(cmd) & _CMD_FLAGS_NOWAIT))
 285                 dc2c->cmd_ring[posted].flags |= DEVCMD2_FNORESULT;
 286
 287         if (_CMD_DIR(cmd) & _CMD_DIR_WRITE) {
 288                 for (i = 0; i < VNIC_DEVCMD_NARGS; i++)
 289                         dc2c->cmd_ring[posted].args[i] = vdev->args[i];
 290         }
 291         /* Adding write memory barrier prevents compiler and/or CPU
 292          * reordering, thus avoiding descriptor posting before
 293          * descriptor is initialized. Otherwise, hardware can read
 294          * stale descriptor fields.
 295          */
 296         wmb();
 297         iowrite32(new_posted, &dc2c->wq_ctrl->posted_index);
 298
 299         if (dc2c->cmd_ring[posted].flags & DEVCMD2_FNORESULT)
 300                 return 0;
 301
 302         for (delay = 0; delay < wait; delay++) {
 303                 udelay(100);
 304                 if (result->color == dc2c->color) {
 305                         dc2c->next_result++;
 306                         if (dc2c->next_result == dc2c->result_size) {
 307                                 dc2c->next_result = 0;
 308                                 dc2c->color = dc2c->color ? 0 : 1;
 309                         }
 310                         if (result->error) {
 311                                 err = (int) result->error;
 312                                 if (err != ERR_ECMDUNKNOWN ||
 313                                     cmd != CMD_CAPABILITY)
 314                                         pr_err("Error %d devcmd %d\n",
 315                                                 err, _CMD_N(cmd));
 316
 317                                 return err;
 318                         }
 319                         if (_CMD_DIR(cmd) & _CMD_DIR_READ) {
 320                                 /*
 321                                  * Adding the rmb() prevents the compiler
 322                                  * and/or CPU from reordering the reads which
 323                                  * would potentially result in reading stale
 324                                  * values.
 325                                  */
 326                                 rmb();
 327                                 for (i = 0; i < VNIC_DEVCMD_NARGS; i++)
 328                                         vdev->args[i] = result->results[i];
 329                         }
 330
 331                         return 0;
 332                 }
 333         }
 334
 335         pr_err("Timed out devcmd %d\n", _CMD_N(cmd));
 336
 337         return -ETIMEDOUT;
 338 }
 339
 340 static int svnic_dev_init_devcmd2(struct vnic_dev *vdev)
 341 {
 342         struct devcmd2_controller *dc2c = NULL;
 343         unsigned int fetch_idx;
 344         int ret;
 345         void __iomem *p;
 346
 347         if (vdev->devcmd2)
 348                 return 0;
 349
 350         p = svnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0);
 351         if (!p)
 352                 return -ENODEV;
 353
 354         dc2c = kzalloc(sizeof(*dc2c), GFP_ATOMIC);
 355         if (!dc2c)
 356                 return -ENOMEM;
 357
 358         vdev->devcmd2 = dc2c;
 359
 360         dc2c->color = 1;
 361         dc2c->result_size = DEVCMD2_RING_SIZE;
 362
 363         ret  = vnic_wq_devcmd2_alloc(vdev,
 364                                      &dc2c->wq,
 365                                      DEVCMD2_RING_SIZE,
 366                                      DEVCMD2_DESC_SIZE);
 367         if (ret)
 368                 goto err_free_devcmd2;
 369
 370         fetch_idx = ioread32(&dc2c->wq.ctrl->fetch_index);
 371         if (fetch_idx == 0xFFFFFFFF) { /* check for hardware gone  */
 372                 /* Hardware surprise removal: reset fetch_index */
 373                 fetch_idx = 0;
 374         }
 375
 376         /*
 377          * Don't change fetch_index ever and
 378          * set posted_index same as fetch_index
 379          * when setting up the WQ for devcmd2.
 380          */
 381         vnic_wq_init_start(&dc2c->wq, 0, fetch_idx, fetch_idx, 0, 0);
 382         svnic_wq_enable(&dc2c->wq);
 383         ret = svnic_dev_alloc_desc_ring(vdev,
 384                                         &dc2c->results_ring,
 385                                         DEVCMD2_RING_SIZE,
 386                                         DEVCMD2_DESC_SIZE);
 387         if (ret)
 388                 goto err_free_wq;
 389
 390         dc2c->result = (struct devcmd2_result *) dc2c->results_ring.descs;
 391         dc2c->cmd_ring = (struct vnic_devcmd2 *) dc2c->wq.ring.descs;
 392         dc2c->wq_ctrl = dc2c->wq.ctrl;
 393         vdev->args[0] = (u64) dc2c->results_ring.base_addr | VNIC_PADDR_TARGET;
 394         vdev->args[1] = DEVCMD2_RING_SIZE;
 395
 396         ret = _svnic_dev_cmd2(vdev, CMD_INITIALIZE_DEVCMD2, VNIC_DVCMD_TMO);
 397         if (ret < 0)
 398                 goto err_free_desc_ring;
 399
 400         vdev->devcmd_rtn = &_svnic_dev_cmd2;
 401         pr_info("DEVCMD2 Initialized.\n");
 402
 403         return ret;
 404
 405 err_free_desc_ring:
 406         svnic_dev_free_desc_ring(vdev, &dc2c->results_ring);
 407
 408 err_free_wq:
 409         svnic_wq_disable(&dc2c->wq);
 410         svnic_wq_free(&dc2c->wq);
 411
 412 err_free_devcmd2:
 413         kfree(dc2c);
 414         vdev->devcmd2 = NULL;
 415
 416         return ret;
 417 } /* end of svnic_dev_init_devcmd2 */
 418
 419 static void vnic_dev_deinit_devcmd2(struct vnic_dev *vdev)
 420 {
 421         struct devcmd2_controller *dc2c = vdev->devcmd2;
 422
 423         vdev->devcmd2 = NULL;
 424         vdev->devcmd_rtn = NULL;
 425
 426         svnic_dev_free_desc_ring(vdev, &dc2c->results_ring);
 427         svnic_wq_disable(&dc2c->wq);
 428         svnic_wq_free(&dc2c->wq);
 429         kfree(dc2c);
 430 }
 431
 432 int svnic_dev_cmd(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
 433         u64 *a0, u64 *a1, int wait)
 434 {
 435         int err;
 436
 437         memset(vdev->args, 0, sizeof(vdev->args));
 438         vdev->args[0] = *a0;
 439         vdev->args[1] = *a1;
 440
 441         err = (*vdev->devcmd_rtn)(vdev, cmd, wait);
 442
 443         *a0 = vdev->args[0];
 444         *a1 = vdev->args[1];
 445
 446         return  err;
 447 }
 448
 449 int svnic_dev_fw_info(struct vnic_dev *vdev,
 450         struct vnic_devcmd_fw_info **fw_info)
 451 {
 452         u64 a0, a1 = 0;
 453         int wait = VNIC_DVCMD_TMO;
 454         int err = 0;
 455
 456         if (!vdev->fw_info) {
 457                 vdev->fw_info = pci_alloc_consistent(vdev->pdev,
 458                         sizeof(struct vnic_devcmd_fw_info),
 459                         &vdev->fw_info_pa);
 460                 if (!vdev->fw_info)
 461                         return -ENOMEM;
 462
 463                 a0 = vdev->fw_info_pa;
 464
 465                 /* only get fw_info once and cache it */
 466                 err = svnic_dev_cmd(vdev, CMD_MCPU_FW_INFO, &a0, &a1, wait);
 467         }
 468
 469         *fw_info = vdev->fw_info;
 470
 471         return err;
 472 }
 473
 474 int svnic_dev_spec(struct vnic_dev *vdev, unsigned int offset,
 475         unsigned int size, void *value)
 476 {
 477         u64 a0, a1;
 478         int wait = VNIC_DVCMD_TMO;
 479         int err;
 480
 481         a0 = offset;
 482         a1 = size;
 483
 484         err = svnic_dev_cmd(vdev, CMD_DEV_SPEC, &a0, &a1, wait);
 485
 486         switch (size) {
 487         case 1:
 488                 *(u8 *)value = (u8)a0;
 489                 break;
 490         case 2:
 491                 *(u16 *)value = (u16)a0;
 492                 break;
 493         case 4:
 494                 *(u32 *)value = (u32)a0;
 495                 break;
 496         case 8:
 497                 *(u64 *)value = a0;
 498                 break;
 499         default:
 500                 BUG();
 501                 break;
 502         }
 503
 504         return err;
 505 }
 506
 507 int svnic_dev_stats_clear(struct vnic_dev *vdev)
 508 {
 509         u64 a0 = 0, a1 = 0;
 510         int wait = VNIC_DVCMD_TMO;
 511
 512         return svnic_dev_cmd(vdev, CMD_STATS_CLEAR, &a0, &a1, wait);
 513 }
 514
 515 int svnic_dev_stats_dump(struct vnic_dev *vdev, struct vnic_stats **stats)
 516 {
 517         u64 a0, a1;
 518         int wait = VNIC_DVCMD_TMO;
 519
 520         if (!vdev->stats) {
 521                 vdev->stats = pci_alloc_consistent(vdev->pdev,
 522                         sizeof(struct vnic_stats), &vdev->stats_pa);
 523                 if (!vdev->stats)
 524                         return -ENOMEM;
 525         }
 526
 527         *stats = vdev->stats;
 528         a0 = vdev->stats_pa;
 529         a1 = sizeof(struct vnic_stats);
 530
 531         return svnic_dev_cmd(vdev, CMD_STATS_DUMP, &a0, &a1, wait);
 532 }
 533
 534 int svnic_dev_close(struct vnic_dev *vdev)
 535 {
 536         u64 a0 = 0, a1 = 0;
 537         int wait = VNIC_DVCMD_TMO;
 538
 539         return svnic_dev_cmd(vdev, CMD_CLOSE, &a0, &a1, wait);
 540 }
 541
 542 int svnic_dev_enable_wait(struct vnic_dev *vdev)
 543 {
 544         u64 a0 = 0, a1 = 0;
 545         int wait = VNIC_DVCMD_TMO;
 546         int err = 0;
 547
 548         err = svnic_dev_cmd(vdev, CMD_ENABLE_WAIT, &a0, &a1, wait);
 549         if (err == ERR_ECMDUNKNOWN)
 550                 return svnic_dev_cmd(vdev, CMD_ENABLE, &a0, &a1, wait);
 551
 552         return err;
 553 }
 554
 555 int svnic_dev_disable(struct vnic_dev *vdev)
 556 {
 557         u64 a0 = 0, a1 = 0;
 558         int wait = VNIC_DVCMD_TMO;
 559
 560         return svnic_dev_cmd(vdev, CMD_DISABLE, &a0, &a1, wait);
 561 }
 562
 563 int svnic_dev_open(struct vnic_dev *vdev, int arg)
 564 {
 565         u64 a0 = (u32)arg, a1 = 0;
 566         int wait = VNIC_DVCMD_TMO;
 567
 568         return svnic_dev_cmd(vdev, CMD_OPEN, &a0, &a1, wait);
 569 }
 570
 571 int svnic_dev_open_done(struct vnic_dev *vdev, int *done)
 572 {
 573         u64 a0 = 0, a1 = 0;
 574         int wait = VNIC_DVCMD_TMO;
 575         int err;
 576
 577         *done = 0;
 578
 579         err = svnic_dev_cmd(vdev, CMD_OPEN_STATUS, &a0, &a1, wait);
 580         if (err)
 581                 return err;
 582
 583         *done = (a0 == 0);
 584
 585         return 0;
 586 }
 587
 588 int svnic_dev_notify_set(struct vnic_dev *vdev, u16 intr)
 589 {
 590         u64 a0, a1;
 591         int wait = VNIC_DVCMD_TMO;
 592
 593         if (!vdev->notify) {
 594                 vdev->notify = pci_alloc_consistent(vdev->pdev,
 595                         sizeof(struct vnic_devcmd_notify),
 596                         &vdev->notify_pa);
 597                 if (!vdev->notify)
 598                         return -ENOMEM;
 599         }
 600
 601         a0 = vdev->notify_pa;
 602         a1 = ((u64)intr << 32) & VNIC_NOTIFY_INTR_MASK;
 603         a1 += sizeof(struct vnic_devcmd_notify);
 604
 605         return svnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait);
 606 }
 607
 608 void svnic_dev_notify_unset(struct vnic_dev *vdev)
 609 {
 610         u64 a0, a1;
 611         int wait = VNIC_DVCMD_TMO;
 612
 613         a0 = 0;  /* paddr = 0 to unset notify buffer */
 614         a1 = VNIC_NOTIFY_INTR_MASK; /* intr num = -1 to unreg for intr */
 615         a1 += sizeof(struct vnic_devcmd_notify);
 616
 617         svnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait);
 618 }
 619
 620 static int vnic_dev_notify_ready(struct vnic_dev *vdev)
 621 {
 622         u32 *words;
 623         unsigned int nwords = sizeof(struct vnic_devcmd_notify) / 4;
 624         unsigned int i;
 625         u32 csum;
 626
 627         if (!vdev->notify)
 628                 return 0;
 629
 630         do {
 631                 csum = 0;
 632                 memcpy(&vdev->notify_copy, vdev->notify,
 633                         sizeof(struct vnic_devcmd_notify));
 634                 words = (u32 *)&vdev->notify_copy;
 635                 for (i = 1; i < nwords; i++)
 636                         csum += words[i];
 637         } while (csum != words[0]);
 638
 639         return 1;
 640 }
 641
 642 int svnic_dev_init(struct vnic_dev *vdev, int arg)
 643 {
 644         u64 a0 = (u32)arg, a1 = 0;
 645         int wait = VNIC_DVCMD_TMO;
 646
 647         return svnic_dev_cmd(vdev, CMD_INIT, &a0, &a1, wait);
 648 }
 649
 650 int svnic_dev_link_status(struct vnic_dev *vdev)
 651 {
 652         if (vdev->linkstatus)
 653                 return *vdev->linkstatus;
 654
 655         if (!vnic_dev_notify_ready(vdev))
 656                 return 0;
 657
 658         return vdev->notify_copy.link_state;
 659 }
 660
 661 u32 svnic_dev_link_down_cnt(struct vnic_dev *vdev)
 662 {
 663         if (!vnic_dev_notify_ready(vdev))
 664                 return 0;
 665
 666         return vdev->notify_copy.link_down_cnt;
 667 }
 668
 669 void svnic_dev_set_intr_mode(struct vnic_dev *vdev,
 670         enum vnic_dev_intr_mode intr_mode)
 671 {
 672         vdev->intr_mode = intr_mode;
 673 }
 674
 675 enum vnic_dev_intr_mode svnic_dev_get_intr_mode(struct vnic_dev *vdev)
 676 {
 677         return vdev->intr_mode;
 678 }
 679
 680 void svnic_dev_unregister(struct vnic_dev *vdev)
 681 {
 682         if (vdev) {
 683                 if (vdev->notify)
 684                         pci_free_consistent(vdev->pdev,
 685                                 sizeof(struct vnic_devcmd_notify),
 686                                 vdev->notify,
 687                                 vdev->notify_pa);
 688                 if (vdev->linkstatus)
 689                         pci_free_consistent(vdev->pdev,
 690                                 sizeof(u32),
 691                                 vdev->linkstatus,
 692                                 vdev->linkstatus_pa);
 693                 if (vdev->stats)
 694                         pci_free_consistent(vdev->pdev,
 695                                 sizeof(struct vnic_stats),
 696                                 vdev->stats, vdev->stats_pa);
 697                 if (vdev->fw_info)
 698                         pci_free_consistent(vdev->pdev,
 699                                 sizeof(struct vnic_devcmd_fw_info),
 700                                 vdev->fw_info, vdev->fw_info_pa);
 701                 if (vdev->devcmd2)
 702                         vnic_dev_deinit_devcmd2(vdev);
 703                 kfree(vdev);
 704         }
 705 }
 706
 707 struct vnic_dev *svnic_dev_alloc_discover(struct vnic_dev *vdev,
 708                                           void *priv,
 709                                           struct pci_dev *pdev,
 710                                           struct vnic_dev_bar *bar,
 711                                           unsigned int num_bars)
 712 {
 713         if (!vdev) {
 714                 vdev = kzalloc(sizeof(struct vnic_dev), GFP_ATOMIC);
 715                 if (!vdev)
 716                         return NULL;
 717         }
 718
 719         vdev->priv = priv;
 720         vdev->pdev = pdev;
 721
 722         if (vnic_dev_discover_res(vdev, bar, num_bars))
 723                 goto err_out;
 724
 725         return vdev;
 726
 727 err_out:
 728         svnic_dev_unregister(vdev);
 729
 730         return NULL;
 731 } /* end of svnic_dev_alloc_discover */
 732
 733 /*
 734  * fallback option is left to keep the interface common for other vnics.
 735  */
 736 int svnic_dev_cmd_init(struct vnic_dev *vdev, int fallback)
 737 {
 738         int err = -ENODEV;
 739         void __iomem *p;
 740
 741         p = svnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0);
 742         if (p)
 743                 err = svnic_dev_init_devcmd2(vdev);
 744         else
 745                 pr_err("DEVCMD2 resource not found.\n");
 746
 747         return err;
 748 } /* end of svnic_dev_cmd_init */