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 34struct 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 45struct vnic_res { 46 void __iomem *vaddr; 47 unsigned int count; 48}; 49 50struct 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 77void *svnic_dev_priv(struct vnic_dev *vdev) 78{ 79 return vdev->priv; 80} 81 82static 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 165unsigned 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 171void __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 190unsigned 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 218void svnic_dev_clear_desc_ring(struct vnic_dev_ring *ring) 219{ 220 memset(ring->descs, 0, ring->size); 221} 222 223int 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 251void 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 262static 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 340static 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 405err_free_desc_ring: 406 svnic_dev_free_desc_ring(vdev, &dc2c->results_ring); 407 408err_free_wq: 409 svnic_wq_disable(&dc2c->wq); 410 svnic_wq_free(&dc2c->wq); 411 412err_free_devcmd2: 413 kfree(dc2c); 414 vdev->devcmd2 = NULL; 415 416 return ret; 417} /* end of svnic_dev_init_devcmd2 */ 418 419static 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 432int 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 449int 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 474int 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 507int 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 515int 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 534int 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 542int 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 555int 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 563int 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 571int 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 588int 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 608void 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 620static 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 642int 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 650int 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 661u32 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 669void 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 675enum vnic_dev_intr_mode svnic_dev_get_intr_mode(struct vnic_dev *vdev) 676{ 677 return vdev->intr_mode; 678} 679 680void 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 707struct 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 727err_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 */ 736int 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 */ 749