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 = dma_alloc_coherent(&vdev->pdev->dev,
 229                         ring->size_unaligned, &ring->base_addr_unaligned,
 230                         GFP_KERNEL);
 231         if (!ring->descs_unaligned) {
 232                 pr_err("Failed to allocate ring (size=%d), aborting\n",
 233                         (int)ring->size);
 234
 235                 return -ENOMEM;
 236         }
 237
 238         ring->base_addr = ALIGN(ring->base_addr_unaligned,
 239                 ring->base_align);
 240         ring->descs = (u8 *)ring->descs_unaligned +
 241                 (ring->base_addr - ring->base_addr_unaligned);
 242
 243         svnic_dev_clear_desc_ring(ring);
 244
 245         ring->desc_avail = ring->desc_count - 1;
 246
 247         return 0;
 248 }
 249
 250 void svnic_dev_free_desc_ring(struct vnic_dev *vdev, struct vnic_dev_ring *ring)
 251 {
 252         if (ring->descs) {
 253                 dma_free_coherent(&vdev->pdev->dev,
 254                         ring->size_unaligned,
 255                         ring->descs_unaligned,
 256                         ring->base_addr_unaligned);
 257                 ring->descs = NULL;
 258         }
 259 }
 260
 261 static int _svnic_dev_cmd2(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
 262         int wait)
 263 {
 264         struct devcmd2_controller *dc2c = vdev->devcmd2;
 265         struct devcmd2_result *result = NULL;
 266         unsigned int i;
 267         int delay;
 268         int err;
 269         u32 posted;
 270         u32 fetch_idx;
 271         u32 new_posted;
 272         u8 color;
 273
 274         fetch_idx = ioread32(&dc2c->wq_ctrl->fetch_index);
 275         if (fetch_idx == 0xFFFFFFFF) { /* check for hardware gone  */
 276                 /* Hardware surprise removal: return error */
 277                 return -ENODEV;
 278         }
 279
 280         posted = ioread32(&dc2c->wq_ctrl->posted_index);
 281
 282         if (posted == 0xFFFFFFFF) { /* check for hardware gone  */
 283                 /* Hardware surprise removal: return error */
 284                 return -ENODEV;
 285         }
 286
 287         new_posted = (posted + 1) % DEVCMD2_RING_SIZE;
 288         if (new_posted == fetch_idx) {
 289                 pr_err("%s: wq is full while issuing devcmd2 command %d, fetch index: %u, posted index: %u\n",
 290                         pci_name(vdev->pdev), _CMD_N(cmd), fetch_idx, posted);
 291
 292                 return -EBUSY;
 293         }
 294
 295         dc2c->cmd_ring[posted].cmd = cmd;
 296         dc2c->cmd_ring[posted].flags = 0;
 297
 298         if ((_CMD_FLAGS(cmd) & _CMD_FLAGS_NOWAIT))
 299                 dc2c->cmd_ring[posted].flags |= DEVCMD2_FNORESULT;
 300
 301         if (_CMD_DIR(cmd) & _CMD_DIR_WRITE) {
 302                 for (i = 0; i < VNIC_DEVCMD_NARGS; i++)
 303                         dc2c->cmd_ring[posted].args[i] = vdev->args[i];
 304         }
 305         /* Adding write memory barrier prevents compiler and/or CPU
 306          * reordering, thus avoiding descriptor posting before
 307          * descriptor is initialized. Otherwise, hardware can read
 308          * stale descriptor fields.
 309          */
 310         wmb();
 311         iowrite32(new_posted, &dc2c->wq_ctrl->posted_index);
 312
 313         if (dc2c->cmd_ring[posted].flags & DEVCMD2_FNORESULT)
 314                 return 0;
 315
 316         result = dc2c->result + dc2c->next_result;
 317         color = dc2c->color;
 318
 319         /*
 320          * Increment next_result, after posting the devcmd, irrespective of
 321          * devcmd result, and it should be done only once.
 322          */
 323         dc2c->next_result++;
 324         if (dc2c->next_result == dc2c->result_size) {
 325                 dc2c->next_result = 0;
 326                 dc2c->color = dc2c->color ? 0 : 1;
 327         }
 328
 329         for (delay = 0; delay < wait; delay++) {
 330                 udelay(100);
 331                 if (result->color == color) {
 332                         if (result->error) {
 333                                 err = (int) result->error;
 334                                 if (err != ERR_ECMDUNKNOWN ||
 335                                     cmd != CMD_CAPABILITY)
 336                                         pr_err("Error %d devcmd %d\n",
 337                                                 err, _CMD_N(cmd));
 338
 339                                 return err;
 340                         }
 341                         if (_CMD_DIR(cmd) & _CMD_DIR_READ) {
 342                                 for (i = 0; i < VNIC_DEVCMD_NARGS; i++)
 343                                         vdev->args[i] = result->results[i];
 344                         }
 345
 346                         return 0;
 347                 }
 348         }
 349
 350         pr_err("Timed out devcmd %d\n", _CMD_N(cmd));
 351
 352         return -ETIMEDOUT;
 353 }
 354
 355 static int svnic_dev_init_devcmd2(struct vnic_dev *vdev)
 356 {
 357         struct devcmd2_controller *dc2c = NULL;
 358         unsigned int fetch_idx;
 359         int ret;
 360         void __iomem *p;
 361
 362         if (vdev->devcmd2)
 363                 return 0;
 364
 365         p = svnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0);
 366         if (!p)
 367                 return -ENODEV;
 368
 369         dc2c = kzalloc(sizeof(*dc2c), GFP_ATOMIC);
 370         if (!dc2c)
 371                 return -ENOMEM;
 372
 373         vdev->devcmd2 = dc2c;
 374
 375         dc2c->color = 1;
 376         dc2c->result_size = DEVCMD2_RING_SIZE;
 377
 378         ret  = vnic_wq_devcmd2_alloc(vdev,
 379                                      &dc2c->wq,
 380                                      DEVCMD2_RING_SIZE,
 381                                      DEVCMD2_DESC_SIZE);
 382         if (ret)
 383                 goto err_free_devcmd2;
 384
 385         fetch_idx = ioread32(&dc2c->wq.ctrl->fetch_index);
 386         if (fetch_idx == 0xFFFFFFFF) { /* check for hardware gone  */
 387                 /* Hardware surprise removal: reset fetch_index */
 388                 fetch_idx = 0;
 389         }
 390
 391         /*
 392          * Don't change fetch_index ever and
 393          * set posted_index same as fetch_index
 394          * when setting up the WQ for devcmd2.
 395          */
 396         vnic_wq_init_start(&dc2c->wq, 0, fetch_idx, fetch_idx, 0, 0);
 397         svnic_wq_enable(&dc2c->wq);
 398         ret = svnic_dev_alloc_desc_ring(vdev,
 399                                         &dc2c->results_ring,
 400                                         DEVCMD2_RING_SIZE,
 401                                         DEVCMD2_DESC_SIZE);
 402         if (ret)
 403                 goto err_free_wq;
 404
 405         dc2c->result = (struct devcmd2_result *) dc2c->results_ring.descs;
 406         dc2c->cmd_ring = (struct vnic_devcmd2 *) dc2c->wq.ring.descs;
 407         dc2c->wq_ctrl = dc2c->wq.ctrl;
 408         vdev->args[0] = (u64) dc2c->results_ring.base_addr | VNIC_PADDR_TARGET;
 409         vdev->args[1] = DEVCMD2_RING_SIZE;
 410
 411         ret = _svnic_dev_cmd2(vdev, CMD_INITIALIZE_DEVCMD2, VNIC_DVCMD_TMO);
 412         if (ret < 0)
 413                 goto err_free_desc_ring;
 414
 415         vdev->devcmd_rtn = &_svnic_dev_cmd2;
 416         pr_info("DEVCMD2 Initialized.\n");
 417
 418         return ret;
 419
 420 err_free_desc_ring:
 421         svnic_dev_free_desc_ring(vdev, &dc2c->results_ring);
 422
 423 err_free_wq:
 424         svnic_wq_disable(&dc2c->wq);
 425         svnic_wq_free(&dc2c->wq);
 426
 427 err_free_devcmd2:
 428         kfree(dc2c);
 429         vdev->devcmd2 = NULL;
 430
 431         return ret;
 432 } /* end of svnic_dev_init_devcmd2 */
 433
 434 static void vnic_dev_deinit_devcmd2(struct vnic_dev *vdev)
 435 {
 436         struct devcmd2_controller *dc2c = vdev->devcmd2;
 437
 438         vdev->devcmd2 = NULL;
 439         vdev->devcmd_rtn = NULL;
 440
 441         svnic_dev_free_desc_ring(vdev, &dc2c->results_ring);
 442         svnic_wq_disable(&dc2c->wq);
 443         svnic_wq_free(&dc2c->wq);
 444         kfree(dc2c);
 445 }
 446
 447 int svnic_dev_cmd(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
 448         u64 *a0, u64 *a1, int wait)
 449 {
 450         int err;
 451
 452         memset(vdev->args, 0, sizeof(vdev->args));
 453         vdev->args[0] = *a0;
 454         vdev->args[1] = *a1;
 455
 456         err = (*vdev->devcmd_rtn)(vdev, cmd, wait);
 457
 458         *a0 = vdev->args[0];
 459         *a1 = vdev->args[1];
 460
 461         return  err;
 462 }
 463
 464 int svnic_dev_fw_info(struct vnic_dev *vdev,
 465         struct vnic_devcmd_fw_info **fw_info)
 466 {
 467         u64 a0, a1 = 0;
 468         int wait = VNIC_DVCMD_TMO;
 469         int err = 0;
 470
 471         if (!vdev->fw_info) {
 472                 vdev->fw_info = dma_alloc_coherent(&vdev->pdev->dev,
 473                         sizeof(struct vnic_devcmd_fw_info),
 474                         &vdev->fw_info_pa, GFP_KERNEL);
 475                 if (!vdev->fw_info)
 476                         return -ENOMEM;
 477
 478                 a0 = vdev->fw_info_pa;
 479
 480                 /* only get fw_info once and cache it */
 481                 err = svnic_dev_cmd(vdev, CMD_MCPU_FW_INFO, &a0, &a1, wait);
 482         }
 483
 484         *fw_info = vdev->fw_info;
 485
 486         return err;
 487 }
 488
 489 int svnic_dev_spec(struct vnic_dev *vdev, unsigned int offset,
 490         unsigned int size, void *value)
 491 {
 492         u64 a0, a1;
 493         int wait = VNIC_DVCMD_TMO;
 494         int err;
 495
 496         a0 = offset;
 497         a1 = size;
 498
 499         err = svnic_dev_cmd(vdev, CMD_DEV_SPEC, &a0, &a1, wait);
 500
 501         switch (size) {
 502         case 1:
 503                 *(u8 *)value = (u8)a0;
 504                 break;
 505         case 2:
 506                 *(u16 *)value = (u16)a0;
 507                 break;
 508         case 4:
 509                 *(u32 *)value = (u32)a0;
 510                 break;
 511         case 8:
 512                 *(u64 *)value = a0;
 513                 break;
 514         default:
 515                 BUG();
 516                 break;
 517         }
 518
 519         return err;
 520 }
 521
 522 int svnic_dev_stats_clear(struct vnic_dev *vdev)
 523 {
 524         u64 a0 = 0, a1 = 0;
 525         int wait = VNIC_DVCMD_TMO;
 526
 527         return svnic_dev_cmd(vdev, CMD_STATS_CLEAR, &a0, &a1, wait);
 528 }
 529
 530 int svnic_dev_stats_dump(struct vnic_dev *vdev, struct vnic_stats **stats)
 531 {
 532         u64 a0, a1;
 533         int wait = VNIC_DVCMD_TMO;
 534
 535         if (!vdev->stats) {
 536                 vdev->stats = dma_alloc_coherent(&vdev->pdev->dev,
 537                         sizeof(struct vnic_stats), &vdev->stats_pa, GFP_KERNEL);
 538                 if (!vdev->stats)
 539                         return -ENOMEM;
 540         }
 541
 542         *stats = vdev->stats;
 543         a0 = vdev->stats_pa;
 544         a1 = sizeof(struct vnic_stats);
 545
 546         return svnic_dev_cmd(vdev, CMD_STATS_DUMP, &a0, &a1, wait);
 547 }
 548
 549 int svnic_dev_close(struct vnic_dev *vdev)
 550 {
 551         u64 a0 = 0, a1 = 0;
 552         int wait = VNIC_DVCMD_TMO;
 553
 554         return svnic_dev_cmd(vdev, CMD_CLOSE, &a0, &a1, wait);
 555 }
 556
 557 int svnic_dev_enable_wait(struct vnic_dev *vdev)
 558 {
 559         u64 a0 = 0, a1 = 0;
 560         int wait = VNIC_DVCMD_TMO;
 561         int err = 0;
 562
 563         err = svnic_dev_cmd(vdev, CMD_ENABLE_WAIT, &a0, &a1, wait);
 564         if (err == ERR_ECMDUNKNOWN)
 565                 return svnic_dev_cmd(vdev, CMD_ENABLE, &a0, &a1, wait);
 566
 567         return err;
 568 }
 569
 570 int svnic_dev_disable(struct vnic_dev *vdev)
 571 {
 572         u64 a0 = 0, a1 = 0;
 573         int wait = VNIC_DVCMD_TMO;
 574
 575         return svnic_dev_cmd(vdev, CMD_DISABLE, &a0, &a1, wait);
 576 }
 577
 578 int svnic_dev_open(struct vnic_dev *vdev, int arg)
 579 {
 580         u64 a0 = (u32)arg, a1 = 0;
 581         int wait = VNIC_DVCMD_TMO;
 582
 583         return svnic_dev_cmd(vdev, CMD_OPEN, &a0, &a1, wait);
 584 }
 585
 586 int svnic_dev_open_done(struct vnic_dev *vdev, int *done)
 587 {
 588         u64 a0 = 0, a1 = 0;
 589         int wait = VNIC_DVCMD_TMO;
 590         int err;
 591
 592         *done = 0;
 593
 594         err = svnic_dev_cmd(vdev, CMD_OPEN_STATUS, &a0, &a1, wait);
 595         if (err)
 596                 return err;
 597
 598         *done = (a0 == 0);
 599
 600         return 0;
 601 }
 602
 603 int svnic_dev_notify_set(struct vnic_dev *vdev, u16 intr)
 604 {
 605         u64 a0, a1;
 606         int wait = VNIC_DVCMD_TMO;
 607
 608         if (!vdev->notify) {
 609                 vdev->notify = dma_alloc_coherent(&vdev->pdev->dev,
 610                         sizeof(struct vnic_devcmd_notify),
 611                         &vdev->notify_pa, GFP_KERNEL);
 612                 if (!vdev->notify)
 613                         return -ENOMEM;
 614         }
 615
 616         a0 = vdev->notify_pa;
 617         a1 = ((u64)intr << 32) & VNIC_NOTIFY_INTR_MASK;
 618         a1 += sizeof(struct vnic_devcmd_notify);
 619
 620         return svnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait);
 621 }
 622
 623 void svnic_dev_notify_unset(struct vnic_dev *vdev)
 624 {
 625         u64 a0, a1;
 626         int wait = VNIC_DVCMD_TMO;
 627
 628         a0 = 0;  /* paddr = 0 to unset notify buffer */
 629         a1 = VNIC_NOTIFY_INTR_MASK; /* intr num = -1 to unreg for intr */
 630         a1 += sizeof(struct vnic_devcmd_notify);
 631
 632         svnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait);
 633 }
 634
 635 static int vnic_dev_notify_ready(struct vnic_dev *vdev)
 636 {
 637         u32 *words;
 638         unsigned int nwords = sizeof(struct vnic_devcmd_notify) / 4;
 639         unsigned int i;
 640         u32 csum;
 641
 642         if (!vdev->notify)
 643                 return 0;
 644
 645         do {
 646                 csum = 0;
 647                 memcpy(&vdev->notify_copy, vdev->notify,
 648                         sizeof(struct vnic_devcmd_notify));
 649                 words = (u32 *)&vdev->notify_copy;
 650                 for (i = 1; i < nwords; i++)
 651                         csum += words[i];
 652         } while (csum != words[0]);
 653
 654         return 1;
 655 }
 656
 657 int svnic_dev_init(struct vnic_dev *vdev, int arg)
 658 {
 659         u64 a0 = (u32)arg, a1 = 0;
 660         int wait = VNIC_DVCMD_TMO;
 661
 662         return svnic_dev_cmd(vdev, CMD_INIT, &a0, &a1, wait);
 663 }
 664
 665 int svnic_dev_link_status(struct vnic_dev *vdev)
 666 {
 667         if (vdev->linkstatus)
 668                 return *vdev->linkstatus;
 669
 670         if (!vnic_dev_notify_ready(vdev))
 671                 return 0;
 672
 673         return vdev->notify_copy.link_state;
 674 }
 675
 676 u32 svnic_dev_link_down_cnt(struct vnic_dev *vdev)
 677 {
 678         if (!vnic_dev_notify_ready(vdev))
 679                 return 0;
 680
 681         return vdev->notify_copy.link_down_cnt;
 682 }
 683
 684 void svnic_dev_set_intr_mode(struct vnic_dev *vdev,
 685         enum vnic_dev_intr_mode intr_mode)
 686 {
 687         vdev->intr_mode = intr_mode;
 688 }
 689
 690 enum vnic_dev_intr_mode svnic_dev_get_intr_mode(struct vnic_dev *vdev)
 691 {
 692         return vdev->intr_mode;
 693 }
 694
 695 void svnic_dev_unregister(struct vnic_dev *vdev)
 696 {
 697         if (vdev) {
 698                 if (vdev->notify)
 699                         dma_free_coherent(&vdev->pdev->dev,
 700                                 sizeof(struct vnic_devcmd_notify),
 701                                 vdev->notify,
 702                                 vdev->notify_pa);
 703                 if (vdev->linkstatus)
 704                         dma_free_coherent(&vdev->pdev->dev,
 705                                 sizeof(u32),
 706                                 vdev->linkstatus,
 707                                 vdev->linkstatus_pa);
 708                 if (vdev->stats)
 709                         dma_free_coherent(&vdev->pdev->dev,
 710                                 sizeof(struct vnic_stats),
 711                                 vdev->stats, vdev->stats_pa);
 712                 if (vdev->fw_info)
 713                         dma_free_coherent(&vdev->pdev->dev,
 714                                 sizeof(struct vnic_devcmd_fw_info),
 715                                 vdev->fw_info, vdev->fw_info_pa);
 716                 if (vdev->devcmd2)
 717                         vnic_dev_deinit_devcmd2(vdev);
 718                 kfree(vdev);
 719         }
 720 }
 721
 722 struct vnic_dev *svnic_dev_alloc_discover(struct vnic_dev *vdev,
 723                                           void *priv,
 724                                           struct pci_dev *pdev,
 725                                           struct vnic_dev_bar *bar,
 726                                           unsigned int num_bars)
 727 {
 728         if (!vdev) {
 729                 vdev = kzalloc(sizeof(struct vnic_dev), GFP_ATOMIC);
 730                 if (!vdev)
 731                         return NULL;
 732         }
 733
 734         vdev->priv = priv;
 735         vdev->pdev = pdev;
 736
 737         if (vnic_dev_discover_res(vdev, bar, num_bars))
 738                 goto err_out;
 739
 740         return vdev;
 741
 742 err_out:
 743         svnic_dev_unregister(vdev);
 744
 745         return NULL;
 746 } /* end of svnic_dev_alloc_discover */
 747
 748 /*
 749  * fallback option is left to keep the interface common for other vnics.
 750  */
 751 int svnic_dev_cmd_init(struct vnic_dev *vdev, int fallback)
 752 {
 753         int err = -ENODEV;
 754         void __iomem *p;
 755
 756         p = svnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0);
 757         if (p)
 758                 err = svnic_dev_init_devcmd2(vdev);
 759         else
 760                 pr_err("DEVCMD2 resource not found.\n");
 761
 762         return err;
 763 } /* end of svnic_dev_cmd_init */