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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Virtio PCI driver - modern (virtio 1.0) device support4 *5 * This module allows virtio devices to be used over a virtual PCI device.6 * This can be used with QEMU based VMMs like KVM or Xen.7 *8 * Copyright IBM Corp. 20079 * Copyright Red Hat, Inc. 201410 *11 * Authors:12 * Anthony Liguori <aliguori@us.ibm.com>13 * Rusty Russell <rusty@rustcorp.com.au>14 * Michael S. Tsirkin <mst@redhat.com>15 */16 17#include <linux/delay.h>18#define VIRTIO_PCI_NO_LEGACY19#define VIRTIO_RING_NO_LEGACY20#include "virtio_pci_common.h"21 22#define VIRTIO_AVQ_SGS_MAX 423 24static u64 vp_get_features(struct virtio_device *vdev)25{26 struct virtio_pci_device *vp_dev = to_vp_device(vdev);27 28 return vp_modern_get_features(&vp_dev->mdev);29}30 31static int vp_avq_index(struct virtio_device *vdev, u16 *index, u16 *num)32{33 struct virtio_pci_device *vp_dev = to_vp_device(vdev);34 35 *num = 0;36 if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ))37 return 0;38 39 *num = vp_modern_avq_num(&vp_dev->mdev);40 if (!(*num))41 return -EINVAL;42 *index = vp_modern_avq_index(&vp_dev->mdev);43 return 0;44}45 46void vp_modern_avq_done(struct virtqueue *vq)47{48 struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);49 struct virtio_pci_admin_vq *admin_vq = &vp_dev->admin_vq;50 struct virtio_admin_cmd *cmd;51 unsigned long flags;52 unsigned int len;53 54 spin_lock_irqsave(&admin_vq->lock, flags);55 do {56 virtqueue_disable_cb(vq);57 while ((cmd = virtqueue_get_buf(vq, &len)))58 complete(&cmd->completion);59 } while (!virtqueue_enable_cb(vq));60 spin_unlock_irqrestore(&admin_vq->lock, flags);61}62 63static int virtqueue_exec_admin_cmd(struct virtio_pci_admin_vq *admin_vq,64 u16 opcode,65 struct scatterlist **sgs,66 unsigned int out_num,67 unsigned int in_num,68 struct virtio_admin_cmd *cmd)69{70 struct virtqueue *vq;71 unsigned long flags;72 int ret;73 74 vq = admin_vq->info->vq;75 if (!vq)76 return -EIO;77 78 if (opcode != VIRTIO_ADMIN_CMD_LIST_QUERY &&79 opcode != VIRTIO_ADMIN_CMD_LIST_USE &&80 !((1ULL << opcode) & admin_vq->supported_cmds))81 return -EOPNOTSUPP;82 83 init_completion(&cmd->completion);84 85again:86 if (virtqueue_is_broken(vq))87 return -EIO;88 89 spin_lock_irqsave(&admin_vq->lock, flags);90 ret = virtqueue_add_sgs(vq, sgs, out_num, in_num, cmd, GFP_KERNEL);91 if (ret < 0) {92 if (ret == -ENOSPC) {93 spin_unlock_irqrestore(&admin_vq->lock, flags);94 cpu_relax();95 goto again;96 }97 goto unlock_err;98 }99 if (!virtqueue_kick(vq))100 goto unlock_err;101 spin_unlock_irqrestore(&admin_vq->lock, flags);102 103 wait_for_completion(&cmd->completion);104 105 return cmd->ret;106 107unlock_err:108 spin_unlock_irqrestore(&admin_vq->lock, flags);109 return -EIO;110}111 112int vp_modern_admin_cmd_exec(struct virtio_device *vdev,113 struct virtio_admin_cmd *cmd)114{115 struct scatterlist *sgs[VIRTIO_AVQ_SGS_MAX], hdr, stat;116 struct virtio_pci_device *vp_dev = to_vp_device(vdev);117 struct virtio_admin_cmd_status *va_status;118 unsigned int out_num = 0, in_num = 0;119 struct virtio_admin_cmd_hdr *va_hdr;120 u16 status;121 int ret;122 123 if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ))124 return -EOPNOTSUPP;125 126 va_status = kzalloc(sizeof(*va_status), GFP_KERNEL);127 if (!va_status)128 return -ENOMEM;129 130 va_hdr = kzalloc(sizeof(*va_hdr), GFP_KERNEL);131 if (!va_hdr) {132 ret = -ENOMEM;133 goto err_alloc;134 }135 136 va_hdr->opcode = cmd->opcode;137 va_hdr->group_type = cmd->group_type;138 va_hdr->group_member_id = cmd->group_member_id;139 140 /* Add header */141 sg_init_one(&hdr, va_hdr, sizeof(*va_hdr));142 sgs[out_num] = &hdr;143 out_num++;144 145 if (cmd->data_sg) {146 sgs[out_num] = cmd->data_sg;147 out_num++;148 }149 150 /* Add return status */151 sg_init_one(&stat, va_status, sizeof(*va_status));152 sgs[out_num + in_num] = &stat;153 in_num++;154 155 if (cmd->result_sg) {156 sgs[out_num + in_num] = cmd->result_sg;157 in_num++;158 }159 160 ret = virtqueue_exec_admin_cmd(&vp_dev->admin_vq,161 le16_to_cpu(cmd->opcode),162 sgs, out_num, in_num, cmd);163 if (ret) {164 dev_err(&vdev->dev,165 "Failed to execute command on admin vq: %d\n.", ret);166 goto err_cmd_exec;167 }168 169 status = le16_to_cpu(va_status->status);170 if (status != VIRTIO_ADMIN_STATUS_OK) {171 dev_err(&vdev->dev,172 "admin command error: status(%#x) qualifier(%#x)\n",173 status, le16_to_cpu(va_status->status_qualifier));174 ret = -status;175 }176 177err_cmd_exec:178 kfree(va_hdr);179err_alloc:180 kfree(va_status);181 return ret;182}183 184static void virtio_pci_admin_cmd_list_init(struct virtio_device *virtio_dev)185{186 struct virtio_pci_device *vp_dev = to_vp_device(virtio_dev);187 struct virtio_admin_cmd cmd = {};188 struct scatterlist result_sg;189 struct scatterlist data_sg;190 __le64 *data;191 int ret;192 193 data = kzalloc(sizeof(*data), GFP_KERNEL);194 if (!data)195 return;196 197 sg_init_one(&result_sg, data, sizeof(*data));198 cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_LIST_QUERY);199 cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SRIOV);200 cmd.result_sg = &result_sg;201 202 ret = vp_modern_admin_cmd_exec(virtio_dev, &cmd);203 if (ret)204 goto end;205 206 *data &= cpu_to_le64(VIRTIO_ADMIN_CMD_BITMAP);207 sg_init_one(&data_sg, data, sizeof(*data));208 cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_LIST_USE);209 cmd.data_sg = &data_sg;210 cmd.result_sg = NULL;211 212 ret = vp_modern_admin_cmd_exec(virtio_dev, &cmd);213 if (ret)214 goto end;215 216 vp_dev->admin_vq.supported_cmds = le64_to_cpu(*data);217end:218 kfree(data);219}220 221static void vp_modern_avq_activate(struct virtio_device *vdev)222{223 if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ))224 return;225 226 virtio_pci_admin_cmd_list_init(vdev);227}228 229static void vp_modern_avq_cleanup(struct virtio_device *vdev)230{231 struct virtio_pci_device *vp_dev = to_vp_device(vdev);232 struct virtio_admin_cmd *cmd;233 struct virtqueue *vq;234 235 if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ))236 return;237 238 vq = vp_dev->admin_vq.info->vq;239 if (!vq)240 return;241 242 while ((cmd = virtqueue_detach_unused_buf(vq))) {243 cmd->ret = -EIO;244 complete(&cmd->completion);245 }246}247 248static void vp_transport_features(struct virtio_device *vdev, u64 features)249{250 struct virtio_pci_device *vp_dev = to_vp_device(vdev);251 struct pci_dev *pci_dev = vp_dev->pci_dev;252 253 if ((features & BIT_ULL(VIRTIO_F_SR_IOV)) &&254 pci_find_ext_capability(pci_dev, PCI_EXT_CAP_ID_SRIOV))255 __virtio_set_bit(vdev, VIRTIO_F_SR_IOV);256 257 if (features & BIT_ULL(VIRTIO_F_RING_RESET))258 __virtio_set_bit(vdev, VIRTIO_F_RING_RESET);259 260 if (features & BIT_ULL(VIRTIO_F_ADMIN_VQ))261 __virtio_set_bit(vdev, VIRTIO_F_ADMIN_VQ);262}263 264static int __vp_check_common_size_one_feature(struct virtio_device *vdev, u32 fbit,265 u32 offset, const char *fname)266{267 struct virtio_pci_device *vp_dev = to_vp_device(vdev);268 269 if (!__virtio_test_bit(vdev, fbit))270 return 0;271 272 if (likely(vp_dev->mdev.common_len >= offset))273 return 0;274 275 dev_err(&vdev->dev,276 "virtio: common cfg size(%zu) does not match the feature %s\n",277 vp_dev->mdev.common_len, fname);278 279 return -EINVAL;280}281 282#define vp_check_common_size_one_feature(vdev, fbit, field) \283 __vp_check_common_size_one_feature(vdev, fbit, \284 offsetofend(struct virtio_pci_modern_common_cfg, field), #fbit)285 286static int vp_check_common_size(struct virtio_device *vdev)287{288 if (vp_check_common_size_one_feature(vdev, VIRTIO_F_NOTIF_CONFIG_DATA, queue_notify_data))289 return -EINVAL;290 291 if (vp_check_common_size_one_feature(vdev, VIRTIO_F_RING_RESET, queue_reset))292 return -EINVAL;293 294 if (vp_check_common_size_one_feature(vdev, VIRTIO_F_ADMIN_VQ, admin_queue_num))295 return -EINVAL;296 297 return 0;298}299 300/* virtio config->finalize_features() implementation */301static int vp_finalize_features(struct virtio_device *vdev)302{303 struct virtio_pci_device *vp_dev = to_vp_device(vdev);304 u64 features = vdev->features;305 306 /* Give virtio_ring a chance to accept features. */307 vring_transport_features(vdev);308 309 /* Give virtio_pci a chance to accept features. */310 vp_transport_features(vdev, features);311 312 if (!__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {313 dev_err(&vdev->dev, "virtio: device uses modern interface "314 "but does not have VIRTIO_F_VERSION_1\n");315 return -EINVAL;316 }317 318 if (vp_check_common_size(vdev))319 return -EINVAL;320 321 vp_modern_set_features(&vp_dev->mdev, vdev->features);322 323 return 0;324}325 326/* virtio config->get() implementation */327static void vp_get(struct virtio_device *vdev, unsigned int offset,328 void *buf, unsigned int len)329{330 struct virtio_pci_device *vp_dev = to_vp_device(vdev);331 struct virtio_pci_modern_device *mdev = &vp_dev->mdev;332 void __iomem *device = mdev->device;333 u8 b;334 __le16 w;335 __le32 l;336 337 BUG_ON(offset + len > mdev->device_len);338 339 switch (len) {340 case 1:341 b = ioread8(device + offset);342 memcpy(buf, &b, sizeof b);343 break;344 case 2:345 w = cpu_to_le16(ioread16(device + offset));346 memcpy(buf, &w, sizeof w);347 break;348 case 4:349 l = cpu_to_le32(ioread32(device + offset));350 memcpy(buf, &l, sizeof l);351 break;352 case 8:353 l = cpu_to_le32(ioread32(device + offset));354 memcpy(buf, &l, sizeof l);355 l = cpu_to_le32(ioread32(device + offset + sizeof l));356 memcpy(buf + sizeof l, &l, sizeof l);357 break;358 default:359 BUG();360 }361}362 363/* the config->set() implementation. it's symmetric to the config->get()364 * implementation */365static void vp_set(struct virtio_device *vdev, unsigned int offset,366 const void *buf, unsigned int len)367{368 struct virtio_pci_device *vp_dev = to_vp_device(vdev);369 struct virtio_pci_modern_device *mdev = &vp_dev->mdev;370 void __iomem *device = mdev->device;371 u8 b;372 __le16 w;373 __le32 l;374 375 BUG_ON(offset + len > mdev->device_len);376 377 switch (len) {378 case 1:379 memcpy(&b, buf, sizeof b);380 iowrite8(b, device + offset);381 break;382 case 2:383 memcpy(&w, buf, sizeof w);384 iowrite16(le16_to_cpu(w), device + offset);385 break;386 case 4:387 memcpy(&l, buf, sizeof l);388 iowrite32(le32_to_cpu(l), device + offset);389 break;390 case 8:391 memcpy(&l, buf, sizeof l);392 iowrite32(le32_to_cpu(l), device + offset);393 memcpy(&l, buf + sizeof l, sizeof l);394 iowrite32(le32_to_cpu(l), device + offset + sizeof l);395 break;396 default:397 BUG();398 }399}400 401static u32 vp_generation(struct virtio_device *vdev)402{403 struct virtio_pci_device *vp_dev = to_vp_device(vdev);404 405 return vp_modern_generation(&vp_dev->mdev);406}407 408/* config->{get,set}_status() implementations */409static u8 vp_get_status(struct virtio_device *vdev)410{411 struct virtio_pci_device *vp_dev = to_vp_device(vdev);412 413 return vp_modern_get_status(&vp_dev->mdev);414}415 416static void vp_set_status(struct virtio_device *vdev, u8 status)417{418 struct virtio_pci_device *vp_dev = to_vp_device(vdev);419 420 /* We should never be setting status to 0. */421 BUG_ON(status == 0);422 vp_modern_set_status(&vp_dev->mdev, status);423 if (status & VIRTIO_CONFIG_S_DRIVER_OK)424 vp_modern_avq_activate(vdev);425}426 427static void vp_reset(struct virtio_device *vdev)428{429 struct virtio_pci_device *vp_dev = to_vp_device(vdev);430 struct virtio_pci_modern_device *mdev = &vp_dev->mdev;431 432 /* 0 status means a reset. */433 vp_modern_set_status(mdev, 0);434 /* After writing 0 to device_status, the driver MUST wait for a read of435 * device_status to return 0 before reinitializing the device.436 * This will flush out the status write, and flush in device writes,437 * including MSI-X interrupts, if any.438 */439 while (vp_modern_get_status(mdev))440 msleep(1);441 442 vp_modern_avq_cleanup(vdev);443 444 /* Flush pending VQ/configuration callbacks. */445 vp_synchronize_vectors(vdev);446}447 448static int vp_active_vq(struct virtqueue *vq, u16 msix_vec)449{450 struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);451 struct virtio_pci_modern_device *mdev = &vp_dev->mdev;452 unsigned long index;453 454 index = vq->index;455 456 /* activate the queue */457 vp_modern_set_queue_size(mdev, index, virtqueue_get_vring_size(vq));458 vp_modern_queue_address(mdev, index, virtqueue_get_desc_addr(vq),459 virtqueue_get_avail_addr(vq),460 virtqueue_get_used_addr(vq));461 462 if (msix_vec != VIRTIO_MSI_NO_VECTOR) {463 msix_vec = vp_modern_queue_vector(mdev, index, msix_vec);464 if (msix_vec == VIRTIO_MSI_NO_VECTOR)465 return -EBUSY;466 }467 468 return 0;469}470 471static int vp_modern_disable_vq_and_reset(struct virtqueue *vq)472{473 struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);474 struct virtio_pci_modern_device *mdev = &vp_dev->mdev;475 struct virtio_pci_vq_info *info;476 unsigned long flags;477 478 if (!virtio_has_feature(vq->vdev, VIRTIO_F_RING_RESET))479 return -ENOENT;480 481 vp_modern_set_queue_reset(mdev, vq->index);482 483 info = vp_dev->vqs[vq->index];484 485 /* delete vq from irq handler */486 spin_lock_irqsave(&vp_dev->lock, flags);487 list_del(&info->node);488 spin_unlock_irqrestore(&vp_dev->lock, flags);489 490 INIT_LIST_HEAD(&info->node);491 492#ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION493 __virtqueue_break(vq);494#endif495 496 /* For the case where vq has an exclusive irq, call synchronize_irq() to497 * wait for completion.498 *499 * note: We can't use disable_irq() since it conflicts with the affinity500 * managed IRQ that is used by some drivers.501 */502 if (vp_dev->per_vq_vectors && info->msix_vector != VIRTIO_MSI_NO_VECTOR)503 synchronize_irq(pci_irq_vector(vp_dev->pci_dev, info->msix_vector));504 505 vq->reset = true;506 507 return 0;508}509 510static int vp_modern_enable_vq_after_reset(struct virtqueue *vq)511{512 struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);513 struct virtio_pci_modern_device *mdev = &vp_dev->mdev;514 struct virtio_pci_vq_info *info;515 unsigned long flags, index;516 int err;517 518 if (!vq->reset)519 return -EBUSY;520 521 index = vq->index;522 info = vp_dev->vqs[index];523 524 if (vp_modern_get_queue_reset(mdev, index))525 return -EBUSY;526 527 if (vp_modern_get_queue_enable(mdev, index))528 return -EBUSY;529 530 err = vp_active_vq(vq, info->msix_vector);531 if (err)532 return err;533 534 if (vq->callback) {535 spin_lock_irqsave(&vp_dev->lock, flags);536 list_add(&info->node, &vp_dev->virtqueues);537 spin_unlock_irqrestore(&vp_dev->lock, flags);538 } else {539 INIT_LIST_HEAD(&info->node);540 }541 542#ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION543 __virtqueue_unbreak(vq);544#endif545 546 vp_modern_set_queue_enable(&vp_dev->mdev, index, true);547 vq->reset = false;548 549 return 0;550}551 552static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)553{554 return vp_modern_config_vector(&vp_dev->mdev, vector);555}556 557static bool vp_notify_with_data(struct virtqueue *vq)558{559 u32 data = vring_notification_data(vq);560 561 iowrite32(data, (void __iomem *)vq->priv);562 563 return true;564}565 566static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,567 struct virtio_pci_vq_info *info,568 unsigned int index,569 void (*callback)(struct virtqueue *vq),570 const char *name,571 bool ctx,572 u16 msix_vec)573{574 575 struct virtio_pci_modern_device *mdev = &vp_dev->mdev;576 bool (*notify)(struct virtqueue *vq);577 struct virtqueue *vq;578 bool is_avq;579 u16 num;580 int err;581 582 if (__virtio_test_bit(&vp_dev->vdev, VIRTIO_F_NOTIFICATION_DATA))583 notify = vp_notify_with_data;584 else585 notify = vp_notify;586 587 is_avq = vp_is_avq(&vp_dev->vdev, index);588 if (index >= vp_modern_get_num_queues(mdev) && !is_avq)589 return ERR_PTR(-EINVAL);590 591 num = vp_modern_get_queue_size(mdev, index);592 /* Check if queue is either not available or already active. */593 if (!num || vp_modern_get_queue_enable(mdev, index))594 return ERR_PTR(-ENOENT);595 596 info->msix_vector = msix_vec;597 598 /* create the vring */599 vq = vring_create_virtqueue(index, num,600 SMP_CACHE_BYTES, &vp_dev->vdev,601 true, true, ctx,602 notify, callback, name);603 if (!vq)604 return ERR_PTR(-ENOMEM);605 606 vq->num_max = num;607 608 err = vp_active_vq(vq, msix_vec);609 if (err)610 goto err;611 612 vq->priv = (void __force *)vp_modern_map_vq_notify(mdev, index, NULL);613 if (!vq->priv) {614 err = -ENOMEM;615 goto err;616 }617 618 return vq;619 620err:621 vring_del_virtqueue(vq);622 return ERR_PTR(err);623}624 625static int vp_modern_find_vqs(struct virtio_device *vdev, unsigned int nvqs,626 struct virtqueue *vqs[],627 struct virtqueue_info vqs_info[],628 struct irq_affinity *desc)629{630 struct virtio_pci_device *vp_dev = to_vp_device(vdev);631 struct virtqueue *vq;632 int rc = vp_find_vqs(vdev, nvqs, vqs, vqs_info, desc);633 634 if (rc)635 return rc;636 637 /* Select and activate all queues. Has to be done last: once we do638 * this, there's no way to go back except reset.639 */640 list_for_each_entry(vq, &vdev->vqs, list)641 vp_modern_set_queue_enable(&vp_dev->mdev, vq->index, true);642 643 return 0;644}645 646static void del_vq(struct virtio_pci_vq_info *info)647{648 struct virtqueue *vq = info->vq;649 struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);650 struct virtio_pci_modern_device *mdev = &vp_dev->mdev;651 652 if (vp_dev->msix_enabled)653 vp_modern_queue_vector(mdev, vq->index,654 VIRTIO_MSI_NO_VECTOR);655 656 if (!mdev->notify_base)657 pci_iounmap(mdev->pci_dev, (void __force __iomem *)vq->priv);658 659 vring_del_virtqueue(vq);660}661 662static int virtio_pci_find_shm_cap(struct pci_dev *dev, u8 required_id,663 u8 *bar, u64 *offset, u64 *len)664{665 int pos;666 667 for (pos = pci_find_capability(dev, PCI_CAP_ID_VNDR); pos > 0;668 pos = pci_find_next_capability(dev, pos, PCI_CAP_ID_VNDR)) {669 u8 type, cap_len, id, res_bar;670 u32 tmp32;671 u64 res_offset, res_length;672 673 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,674 cfg_type), &type);675 if (type != VIRTIO_PCI_CAP_SHARED_MEMORY_CFG)676 continue;677 678 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,679 cap_len), &cap_len);680 if (cap_len != sizeof(struct virtio_pci_cap64)) {681 dev_err(&dev->dev, "%s: shm cap with bad size offset:"682 " %d size: %d\n", __func__, pos, cap_len);683 continue;684 }685 686 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,687 id), &id);688 if (id != required_id)689 continue;690 691 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,692 bar), &res_bar);693 if (res_bar >= PCI_STD_NUM_BARS)694 continue;695 696 /* Type and ID match, and the BAR value isn't reserved.697 * Looks good.698 */699 700 /* Read the lower 32bit of length and offset */701 pci_read_config_dword(dev, pos + offsetof(struct virtio_pci_cap,702 offset), &tmp32);703 res_offset = tmp32;704 pci_read_config_dword(dev, pos + offsetof(struct virtio_pci_cap,705 length), &tmp32);706 res_length = tmp32;707 708 /* and now the top half */709 pci_read_config_dword(dev,710 pos + offsetof(struct virtio_pci_cap64,711 offset_hi), &tmp32);712 res_offset |= ((u64)tmp32) << 32;713 pci_read_config_dword(dev,714 pos + offsetof(struct virtio_pci_cap64,715 length_hi), &tmp32);716 res_length |= ((u64)tmp32) << 32;717 718 *bar = res_bar;719 *offset = res_offset;720 *len = res_length;721 722 return pos;723 }724 return 0;725}726 727static bool vp_get_shm_region(struct virtio_device *vdev,728 struct virtio_shm_region *region, u8 id)729{730 struct virtio_pci_device *vp_dev = to_vp_device(vdev);731 struct pci_dev *pci_dev = vp_dev->pci_dev;732 u8 bar;733 u64 offset, len;734 phys_addr_t phys_addr;735 size_t bar_len;736 737 if (!virtio_pci_find_shm_cap(pci_dev, id, &bar, &offset, &len))738 return false;739 740 phys_addr = pci_resource_start(pci_dev, bar);741 bar_len = pci_resource_len(pci_dev, bar);742 743 if ((offset + len) < offset) {744 dev_err(&pci_dev->dev, "%s: cap offset+len overflow detected\n",745 __func__);746 return false;747 }748 749 if (offset + len > bar_len) {750 dev_err(&pci_dev->dev, "%s: bar shorter than cap offset+len\n",751 __func__);752 return false;753 }754 755 region->len = len;756 region->addr = (u64) phys_addr + offset;757 758 return true;759}760 761static const struct virtio_config_ops virtio_pci_config_nodev_ops = {762 .get = NULL,763 .set = NULL,764 .generation = vp_generation,765 .get_status = vp_get_status,766 .set_status = vp_set_status,767 .reset = vp_reset,768 .find_vqs = vp_modern_find_vqs,769 .del_vqs = vp_del_vqs,770 .synchronize_cbs = vp_synchronize_vectors,771 .get_features = vp_get_features,772 .finalize_features = vp_finalize_features,773 .bus_name = vp_bus_name,774 .set_vq_affinity = vp_set_vq_affinity,775 .get_vq_affinity = vp_get_vq_affinity,776 .get_shm_region = vp_get_shm_region,777 .disable_vq_and_reset = vp_modern_disable_vq_and_reset,778 .enable_vq_after_reset = vp_modern_enable_vq_after_reset,779};780 781static const struct virtio_config_ops virtio_pci_config_ops = {782 .get = vp_get,783 .set = vp_set,784 .generation = vp_generation,785 .get_status = vp_get_status,786 .set_status = vp_set_status,787 .reset = vp_reset,788 .find_vqs = vp_modern_find_vqs,789 .del_vqs = vp_del_vqs,790 .synchronize_cbs = vp_synchronize_vectors,791 .get_features = vp_get_features,792 .finalize_features = vp_finalize_features,793 .bus_name = vp_bus_name,794 .set_vq_affinity = vp_set_vq_affinity,795 .get_vq_affinity = vp_get_vq_affinity,796 .get_shm_region = vp_get_shm_region,797 .disable_vq_and_reset = vp_modern_disable_vq_and_reset,798 .enable_vq_after_reset = vp_modern_enable_vq_after_reset,799};800 801/* the PCI probing function */802int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev)803{804 struct virtio_pci_modern_device *mdev = &vp_dev->mdev;805 struct pci_dev *pci_dev = vp_dev->pci_dev;806 int err;807 808 mdev->pci_dev = pci_dev;809 810 err = vp_modern_probe(mdev);811 if (err)812 return err;813 814 if (mdev->device)815 vp_dev->vdev.config = &virtio_pci_config_ops;816 else817 vp_dev->vdev.config = &virtio_pci_config_nodev_ops;818 819 vp_dev->config_vector = vp_config_vector;820 vp_dev->setup_vq = setup_vq;821 vp_dev->del_vq = del_vq;822 vp_dev->avq_index = vp_avq_index;823 vp_dev->isr = mdev->isr;824 vp_dev->vdev.id = mdev->id;825 826 spin_lock_init(&vp_dev->admin_vq.lock);827 return 0;828}829 830void virtio_pci_modern_remove(struct virtio_pci_device *vp_dev)831{832 struct virtio_pci_modern_device *mdev = &vp_dev->mdev;833 834 vp_modern_remove(mdev);835}836