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 = NULL;
 267         unsigned int i;
 268         int delay;
 269         int err;
 270         u32 posted;
 271         u32 fetch_idx;
 272         u32 new_posted;
 273         u8 color;
 274
 275         fetch_idx = ioread32(&dc2c->wq_ctrl->fetch_index);
 276         if (fetch_idx == 0xFFFFFFFF) { /* check for hardware gone  */
 277                 /* Hardware surprise removal: return error */
 278                 return -ENODEV;
 279         }
 280
 281         posted = ioread32(&dc2c->wq_ctrl->posted_index);
 282
 283         if (posted == 0xFFFFFFFF) { /* check for hardware gone  */
 284                 /* Hardware surprise removal: return error */
 285                 return -ENODEV;
 286         }
 287
 288         new_posted = (posted + 1) % DEVCMD2_RING_SIZE;
 289         if (new_posted == fetch_idx) {
 290                 pr_err("%s: wq is full while issuing devcmd2 command %d, fetch index: %u, posted index: %u\n",
 291                         pci_name(vdev->pdev), _CMD_N(cmd), fetch_idx, posted);
 292
 293                 return -EBUSY;
 294         }
 295
 296         dc2c->cmd_ring[posted].cmd = cmd;
 297         dc2c->cmd_ring[posted].flags = 0;
 298
 299         if ((_CMD_FLAGS(cmd) & _CMD_FLAGS_NOWAIT))
 300                 dc2c->cmd_ring[posted].flags |= DEVCMD2_FNORESULT;
 301
 302         if (_CMD_DIR(cmd) & _CMD_DIR_WRITE) {
 303                 for (i = 0; i < VNIC_DEVCMD_NARGS; i++)
 304                         dc2c->cmd_ring[posted].args[i] = vdev->args[i];
 305         }
 306         /* Adding write memory barrier prevents compiler and/or CPU
 307          * reordering, thus avoiding descriptor posting before
 308          * descriptor is initialized. Otherwise, hardware can read
 309          * stale descriptor fields.
 310          */
 311         wmb();
 312         iowrite32(new_posted, &dc2c->wq_ctrl->posted_index);
 313
 314         if (dc2c->cmd_ring[posted].flags & DEVCMD2_FNORESULT)
 315                 return 0;
 316
 317         result = dc2c->result + dc2c->next_result;
 318         color = dc2c->color;
 319
 320         /*
 321          * Increment next_result, after posting the devcmd, irrespective of
 322          * devcmd result, and it should be done only once.
 323          */
 324         dc2c->next_result++;
 325         if (dc2c->next_result == dc2c->result_size) {
 326                 dc2c->next_result = 0;
 327                 dc2c->color = dc2c->color ? 0 : 1;
 328         }
 329
 330         for (delay = 0; delay < wait; delay++) {
 331                 udelay(100);
 332                 if (result->color == color) {
 333                         if (result->error) {
 334                                 err = (int) result->error;
 335                                 if (err != ERR_ECMDUNKNOWN ||
 336                                     cmd != CMD_CAPABILITY)
 337                                         pr_err("Error %d devcmd %d\n",
 338                                                 err, _CMD_N(cmd));
 339
 340                                 return err;
 341                         }
 342                         if (_CMD_DIR(cmd) & _CMD_DIR_READ) {
 343                                 for (i = 0; i < VNIC_DEVCMD_NARGS; i++)
 344                                         vdev->args[i] = result->results[i];
 345                         }
 346
 347                         return 0;
 348                 }
 349         }
 350
 351         pr_err("Timed out devcmd %d\n", _CMD_N(cmd));
 352
 353         return -ETIMEDOUT;
 354 }
 355
 356 static int svnic_dev_init_devcmd2(struct vnic_dev *vdev)
 357 {
 358         struct devcmd2_controller *dc2c = NULL;
 359         unsigned int fetch_idx;
 360         int ret;
 361         void __iomem *p;
 362
 363         if (vdev->devcmd2)
 364                 return 0;
 365
 366         p = svnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0);
 367         if (!p)
 368                 return -ENODEV;
 369
 370         dc2c = kzalloc(sizeof(*dc2c), GFP_ATOMIC);
 371         if (!dc2c)
 372                 return -ENOMEM;
 373
 374         vdev->devcmd2 = dc2c;
 375
 376         dc2c->color = 1;
 377         dc2c->result_size = DEVCMD2_RING_SIZE;
 378
 379         ret  = vnic_wq_devcmd2_alloc(vdev,
 380                                      &dc2c->wq,
 381                                      DEVCMD2_RING_SIZE,
 382                                      DEVCMD2_DESC_SIZE);
 383         if (ret)
 384                 goto err_free_devcmd2;
 385
 386         fetch_idx = ioread32(&dc2c->wq.ctrl->fetch_index);
 387         if (fetch_idx == 0xFFFFFFFF) { /* check for hardware gone  */
 388                 /* Hardware surprise removal: reset fetch_index */
 389                 fetch_idx = 0;
 390         }
 391
 392         /*
 393          * Don't change fetch_index ever and
 394          * set posted_index same as fetch_index
 395          * when setting up the WQ for devcmd2.
 396          */
 397         vnic_wq_init_start(&dc2c->wq, 0, fetch_idx, fetch_idx, 0, 0);
 398         svnic_wq_enable(&dc2c->wq);
 399         ret = svnic_dev_alloc_desc_ring(vdev,
 400                                         &dc2c->results_ring,
 401                                         DEVCMD2_RING_SIZE,
 402                                         DEVCMD2_DESC_SIZE);
 403         if (ret)
 404                 goto err_free_wq;
 405
 406         dc2c->result = (struct devcmd2_result *) dc2c->results_ring.descs;
 407         dc2c->cmd_ring = (struct vnic_devcmd2 *) dc2c->wq.ring.descs;
 408         dc2c->wq_ctrl = dc2c->wq.ctrl;
 409         vdev->args[0] = (u64) dc2c->results_ring.base_addr | VNIC_PADDR_TARGET;
 410         vdev->args[1] = DEVCMD2_RING_SIZE;
 411
 412         ret = _svnic_dev_cmd2(vdev, CMD_INITIALIZE_DEVCMD2, VNIC_DVCMD_TMO);
 413         if (ret < 0)
 414                 goto err_free_desc_ring;
 415
 416         vdev->devcmd_rtn = &_svnic_dev_cmd2;
 417         pr_info("DEVCMD2 Initialized.\n");
 418
 419         return ret;
 420
 421 err_free_desc_ring:
 422         svnic_dev_free_desc_ring(vdev, &dc2c->results_ring);
 423
 424 err_free_wq:
 425         svnic_wq_disable(&dc2c->wq);
 426         svnic_wq_free(&dc2c->wq);
 427
 428 err_free_devcmd2:
 429         kfree(dc2c);
 430         vdev->devcmd2 = NULL;
 431
 432         return ret;
 433 } /* end of svnic_dev_init_devcmd2 */
 434
 435 static void vnic_dev_deinit_devcmd2(struct vnic_dev *vdev)
 436 {
 437         struct devcmd2_controller *dc2c = vdev->devcmd2;
 438
 439         vdev->devcmd2 = NULL;
 440         vdev->devcmd_rtn = NULL;
 441
 442         svnic_dev_free_desc_ring(vdev, &dc2c->results_ring);
 443         svnic_wq_disable(&dc2c->wq);
 444         svnic_wq_free(&dc2c->wq);
 445         kfree(dc2c);
 446 }
 447
 448 int svnic_dev_cmd(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
 449         u64 *a0, u64 *a1, int wait)
 450 {
 451         int err;
 452
 453         memset(vdev->args, 0, sizeof(vdev->args));
 454         vdev->args[0] = *a0;
 455         vdev->args[1] = *a1;
 456
 457         err = (*vdev->devcmd_rtn)(vdev, cmd, wait);
 458
 459         *a0 = vdev->args[0];
 460         *a1 = vdev->args[1];
 461
 462         return  err;
 463 }
 464
 465 int svnic_dev_fw_info(struct vnic_dev *vdev,
 466         struct vnic_devcmd_fw_info **fw_info)
 467 {
 468         u64 a0, a1 = 0;
 469         int wait = VNIC_DVCMD_TMO;
 470         int err = 0;
 471
 472         if (!vdev->fw_info) {
 473                 vdev->fw_info = pci_alloc_consistent(vdev->pdev,
 474                         sizeof(struct vnic_devcmd_fw_info),
 475                         &vdev->fw_info_pa);
 476                 if (!vdev->fw_info)
 477                         return -ENOMEM;
 478
 479                 a0 = vdev->fw_info_pa;
 480
 481                 /* only get fw_info once and cache it */
 482                 err = svnic_dev_cmd(vdev, CMD_MCPU_FW_INFO, &a0, &a1, wait);
 483         }
 484
 485         *fw_info = vdev->fw_info;
 486
 487         return err;
 488 }
 489
 490 int svnic_dev_spec(struct vnic_dev *vdev, unsigned int offset,
 491         unsigned int size, void *value)
 492 {
 493         u64 a0, a1;
 494         int wait = VNIC_DVCMD_TMO;
 495         int err;
 496
 497         a0 = offset;
 498         a1 = size;
 499
 500         err = svnic_dev_cmd(vdev, CMD_DEV_SPEC, &a0, &a1, wait);
 501
 502         switch (size) {
 503         case 1:
 504                 *(u8 *)value = (u8)a0;
 505                 break;
 506         case 2:
 507                 *(u16 *)value = (u16)a0;
 508                 break;
 509         case 4:
 510                 *(u32 *)value = (u32)a0;
 511                 break;
 512         case 8:
 513                 *(u64 *)value = a0;
 514                 break;
 515         default:
 516                 BUG();
 517                 break;
 518         }
 519
 520         return err;
 521 }
 522
 523 int svnic_dev_stats_clear(struct vnic_dev *vdev)
 524 {
 525         u64 a0 = 0, a1 = 0;
 526         int wait = VNIC_DVCMD_TMO;
 527
 528         return svnic_dev_cmd(vdev, CMD_STATS_CLEAR, &a0, &a1, wait);
 529 }
 530
 531 int svnic_dev_stats_dump(struct vnic_dev *vdev, struct vnic_stats **stats)
 532 {
 533         u64 a0, a1;
 534         int wait = VNIC_DVCMD_TMO;
 535
 536         if (!vdev->stats) {
 537                 vdev->stats = pci_alloc_consistent(vdev->pdev,
 538                         sizeof(struct vnic_stats), &vdev->stats_pa);
 539                 if (!vdev->stats)
 540                         return -ENOMEM;
 541         }
 542
 543         *stats = vdev->stats;
 544         a0 = vdev->stats_pa;
 545         a1 = sizeof(struct vnic_stats);
 546
 547         return svnic_dev_cmd(vdev, CMD_STATS_DUMP, &a0, &a1, wait);
 548 }
 549
 550 int svnic_dev_close(struct vnic_dev *vdev)
 551 {
 552         u64 a0 = 0, a1 = 0;
 553         int wait = VNIC_DVCMD_TMO;
 554
 555         return svnic_dev_cmd(vdev, CMD_CLOSE, &a0, &a1, wait);
 556 }
 557
 558 int svnic_dev_enable_wait(struct vnic_dev *vdev)
 559 {
 560         u64 a0 = 0, a1 = 0;
 561         int wait = VNIC_DVCMD_TMO;
 562         int err = 0;
 563
 564         err = svnic_dev_cmd(vdev, CMD_ENABLE_WAIT, &a0, &a1, wait);
 565         if (err == ERR_ECMDUNKNOWN)
 566                 return svnic_dev_cmd(vdev, CMD_ENABLE, &a0, &a1, wait);
 567
 568         return err;
 569 }
 570
 571 int svnic_dev_disable(struct vnic_dev *vdev)
 572 {
 573         u64 a0 = 0, a1 = 0;
 574         int wait = VNIC_DVCMD_TMO;
 575
 576         return svnic_dev_cmd(vdev, CMD_DISABLE, &a0, &a1, wait);
 577 }
 578
 579 int svnic_dev_open(struct vnic_dev *vdev, int arg)
 580 {
 581         u64 a0 = (u32)arg, a1 = 0;
 582         int wait = VNIC_DVCMD_TMO;
 583
 584         return svnic_dev_cmd(vdev, CMD_OPEN, &a0, &a1, wait);
 585 }
 586
 587 int svnic_dev_open_done(struct vnic_dev *vdev, int *done)
 588 {
 589         u64 a0 = 0, a1 = 0;
 590         int wait = VNIC_DVCMD_TMO;
 591         int err;
 592
 593         *done = 0;
 594
 595         err = svnic_dev_cmd(vdev, CMD_OPEN_STATUS, &a0, &a1, wait);
 596         if (err)
 597                 return err;
 598
 599         *done = (a0 == 0);
 600
 601         return 0;
 602 }
 603
 604 int svnic_dev_notify_set(struct vnic_dev *vdev, u16 intr)
 605 {
 606         u64 a0, a1;
 607         int wait = VNIC_DVCMD_TMO;
 608
 609         if (!vdev->notify) {
 610                 vdev->notify = pci_alloc_consistent(vdev->pdev,
 611                         sizeof(struct vnic_devcmd_notify),
 612                         &vdev->notify_pa);
 613                 if (!vdev->notify)
 614                         return -ENOMEM;
 615         }
 616
 617         a0 = vdev->notify_pa;
 618         a1 = ((u64)intr << 32) & VNIC_NOTIFY_INTR_MASK;
 619         a1 += sizeof(struct vnic_devcmd_notify);
 620
 621         return svnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait);
 622 }
 623
 624 void svnic_dev_notify_unset(struct vnic_dev *vdev)
 625 {
 626         u64 a0, a1;
 627         int wait = VNIC_DVCMD_TMO;
 628
 629         a0 = 0;  /* paddr = 0 to unset notify buffer */
 630         a1 = VNIC_NOTIFY_INTR_MASK; /* intr num = -1 to unreg for intr */
 631         a1 += sizeof(struct vnic_devcmd_notify);
 632
 633         svnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait);
 634 }
 635
 636 static int vnic_dev_notify_ready(struct vnic_dev *vdev)
 637 {
 638         u32 *words;
 639         unsigned int nwords = sizeof(struct vnic_devcmd_notify) / 4;
 640         unsigned int i;
 641         u32 csum;
 642
 643         if (!vdev->notify)
 644                 return 0;
 645
 646         do {
 647                 csum = 0;
 648                 memcpy(&vdev->notify_copy, vdev->notify,
 649                         sizeof(struct vnic_devcmd_notify));
 650                 words = (u32 *)&vdev->notify_copy;
 651                 for (i = 1; i < nwords; i++)
 652                         csum += words[i];
 653         } while (csum != words[0]);
 654
 655         return 1;
 656 }
 657
 658 int svnic_dev_init(struct vnic_dev *vdev, int arg)
 659 {
 660         u64 a0 = (u32)arg, a1 = 0;
 661         int wait = VNIC_DVCMD_TMO;
 662
 663         return svnic_dev_cmd(vdev, CMD_INIT, &a0, &a1, wait);
 664 }
 665
 666 int svnic_dev_link_status(struct vnic_dev *vdev)
 667 {
 668         if (vdev->linkstatus)
 669                 return *vdev->linkstatus;
 670
 671         if (!vnic_dev_notify_ready(vdev))
 672                 return 0;
 673
 674         return vdev->notify_copy.link_state;
 675 }
 676
 677 u32 svnic_dev_link_down_cnt(struct vnic_dev *vdev)
 678 {
 679         if (!vnic_dev_notify_ready(vdev))
 680                 return 0;
 681
 682         return vdev->notify_copy.link_down_cnt;
 683 }
 684
 685 void svnic_dev_set_intr_mode(struct vnic_dev *vdev,
 686         enum vnic_dev_intr_mode intr_mode)
 687 {
 688         vdev->intr_mode = intr_mode;
 689 }
 690
 691 enum vnic_dev_intr_mode svnic_dev_get_intr_mode(struct vnic_dev *vdev)
 692 {
 693         return vdev->intr_mode;
 694 }
 695
 696 void svnic_dev_unregister(struct vnic_dev *vdev)
 697 {
 698         if (vdev) {
 699                 if (vdev->notify)
 700                         pci_free_consistent(vdev->pdev,
 701                                 sizeof(struct vnic_devcmd_notify),
 702                                 vdev->notify,
 703                                 vdev->notify_pa);
 704                 if (vdev->linkstatus)
 705                         pci_free_consistent(vdev->pdev,
 706                                 sizeof(u32),
 707                                 vdev->linkstatus,
 708                                 vdev->linkstatus_pa);
 709                 if (vdev->stats)
 710                         pci_free_consistent(vdev->pdev,
 711                                 sizeof(struct vnic_stats),
 712                                 vdev->stats, vdev->stats_pa);
 713                 if (vdev->fw_info)
 714                         pci_free_consistent(vdev->pdev,
 715                                 sizeof(struct vnic_devcmd_fw_info),
 716                                 vdev->fw_info, vdev->fw_info_pa);
 717                 if (vdev->devcmd2)
 718                         vnic_dev_deinit_devcmd2(vdev);
 719                 kfree(vdev);
 720         }
 721 }
 722
 723 struct vnic_dev *svnic_dev_alloc_discover(struct vnic_dev *vdev,
 724                                           void *priv,
 725                                           struct pci_dev *pdev,
 726                                           struct vnic_dev_bar *bar,
 727                                           unsigned int num_bars)
 728 {
 729         if (!vdev) {
 730                 vdev = kzalloc(sizeof(struct vnic_dev), GFP_ATOMIC);
 731                 if (!vdev)
 732                         return NULL;
 733         }
 734
 735         vdev->priv = priv;
 736         vdev->pdev = pdev;
 737
 738         if (vnic_dev_discover_res(vdev, bar, num_bars))
 739                 goto err_out;
 740
 741         return vdev;
 742
 743 err_out:
 744         svnic_dev_unregister(vdev);
 745
 746         return NULL;
 747 } /* end of svnic_dev_alloc_discover */
 748
 749 /*
 750  * fallback option is left to keep the interface common for other vnics.
 751  */
 752 int svnic_dev_cmd_init(struct vnic_dev *vdev, int fallback)
 753 {
 754         int err = -ENODEV;
 755         void __iomem *p;
 756
 757         p = svnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0);
 758         if (p)
 759                 err = svnic_dev_init_devcmd2(vdev);
 760         else
 761                 pr_err("DEVCMD2 resource not found.\n");
 762
 763         return err;
 764 } /* end of svnic_dev_cmd_init */