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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Virtio PCI driver - common functionality for all device versions4 *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 "virtio_pci_common.h"18 19static bool force_legacy = false;20 21#if IS_ENABLED(CONFIG_VIRTIO_PCI_LEGACY)22module_param(force_legacy, bool, 0444);23MODULE_PARM_DESC(force_legacy,24 "Force legacy mode for transitional virtio 1 devices");25#endif26 27bool vp_is_avq(struct virtio_device *vdev, unsigned int index)28{29 struct virtio_pci_device *vp_dev = to_vp_device(vdev);30 31 if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ))32 return false;33 34 return index == vp_dev->admin_vq.vq_index;35}36 37/* wait for pending irq handlers */38void vp_synchronize_vectors(struct virtio_device *vdev)39{40 struct virtio_pci_device *vp_dev = to_vp_device(vdev);41 int i;42 43 if (vp_dev->intx_enabled)44 synchronize_irq(vp_dev->pci_dev->irq);45 46 for (i = 0; i < vp_dev->msix_vectors; ++i)47 synchronize_irq(pci_irq_vector(vp_dev->pci_dev, i));48}49 50/* the notify function used when creating a virt queue */51bool vp_notify(struct virtqueue *vq)52{53 /* we write the queue's selector into the notification register to54 * signal the other end */55 iowrite16(vq->index, (void __iomem *)vq->priv);56 return true;57}58 59/* Notify all slow path virtqueues on an interrupt. */60static void vp_vring_slow_path_interrupt(int irq,61 struct virtio_pci_device *vp_dev)62{63 struct virtio_pci_vq_info *info;64 unsigned long flags;65 66 spin_lock_irqsave(&vp_dev->lock, flags);67 list_for_each_entry(info, &vp_dev->slow_virtqueues, node)68 vring_interrupt(irq, info->vq);69 spin_unlock_irqrestore(&vp_dev->lock, flags);70}71 72/* Handle a configuration change: Tell driver if it wants to know. */73static irqreturn_t vp_config_changed(int irq, void *opaque)74{75 struct virtio_pci_device *vp_dev = opaque;76 77 virtio_config_changed(&vp_dev->vdev);78 vp_vring_slow_path_interrupt(irq, vp_dev);79 return IRQ_HANDLED;80}81 82/* Notify all virtqueues on an interrupt. */83static irqreturn_t vp_vring_interrupt(int irq, void *opaque)84{85 struct virtio_pci_device *vp_dev = opaque;86 struct virtio_pci_vq_info *info;87 irqreturn_t ret = IRQ_NONE;88 unsigned long flags;89 90 spin_lock_irqsave(&vp_dev->lock, flags);91 list_for_each_entry(info, &vp_dev->virtqueues, node) {92 if (vring_interrupt(irq, info->vq) == IRQ_HANDLED)93 ret = IRQ_HANDLED;94 }95 spin_unlock_irqrestore(&vp_dev->lock, flags);96 97 return ret;98}99 100/* A small wrapper to also acknowledge the interrupt when it's handled.101 * I really need an EIO hook for the vring so I can ack the interrupt once we102 * know that we'll be handling the IRQ but before we invoke the callback since103 * the callback may notify the host which results in the host attempting to104 * raise an interrupt that we would then mask once we acknowledged the105 * interrupt. */106static irqreturn_t vp_interrupt(int irq, void *opaque)107{108 struct virtio_pci_device *vp_dev = opaque;109 u8 isr;110 111 /* reading the ISR has the effect of also clearing it so it's very112 * important to save off the value. */113 isr = ioread8(vp_dev->isr);114 115 /* It's definitely not us if the ISR was not high */116 if (!isr)117 return IRQ_NONE;118 119 /* Configuration change? Tell driver if it wants to know. */120 if (isr & VIRTIO_PCI_ISR_CONFIG)121 vp_config_changed(irq, opaque);122 123 return vp_vring_interrupt(irq, opaque);124}125 126static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,127 bool per_vq_vectors, struct irq_affinity *desc)128{129 struct virtio_pci_device *vp_dev = to_vp_device(vdev);130 const char *name = dev_name(&vp_dev->vdev.dev);131 unsigned int flags = PCI_IRQ_MSIX;132 unsigned int i, v;133 int err = -ENOMEM;134 135 vp_dev->msix_vectors = nvectors;136 137 vp_dev->msix_names = kmalloc_array(nvectors,138 sizeof(*vp_dev->msix_names),139 GFP_KERNEL);140 if (!vp_dev->msix_names)141 goto error;142 vp_dev->msix_affinity_masks143 = kcalloc(nvectors, sizeof(*vp_dev->msix_affinity_masks),144 GFP_KERNEL);145 if (!vp_dev->msix_affinity_masks)146 goto error;147 for (i = 0; i < nvectors; ++i)148 if (!alloc_cpumask_var(&vp_dev->msix_affinity_masks[i],149 GFP_KERNEL))150 goto error;151 152 if (!per_vq_vectors)153 desc = NULL;154 155 if (desc) {156 flags |= PCI_IRQ_AFFINITY;157 desc->pre_vectors++; /* virtio config vector */158 }159 160 err = pci_alloc_irq_vectors_affinity(vp_dev->pci_dev, nvectors,161 nvectors, flags, desc);162 if (err < 0)163 goto error;164 vp_dev->msix_enabled = 1;165 166 /* Set the vector used for configuration */167 v = vp_dev->msix_used_vectors;168 snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,169 "%s-config", name);170 err = request_irq(pci_irq_vector(vp_dev->pci_dev, v),171 vp_config_changed, 0, vp_dev->msix_names[v],172 vp_dev);173 if (err)174 goto error;175 ++vp_dev->msix_used_vectors;176 177 v = vp_dev->config_vector(vp_dev, v);178 /* Verify we had enough resources to assign the vector */179 if (v == VIRTIO_MSI_NO_VECTOR) {180 err = -EBUSY;181 goto error;182 }183 184 if (!per_vq_vectors) {185 /* Shared vector for all VQs */186 v = vp_dev->msix_used_vectors;187 snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,188 "%s-virtqueues", name);189 err = request_irq(pci_irq_vector(vp_dev->pci_dev, v),190 vp_vring_interrupt, 0, vp_dev->msix_names[v],191 vp_dev);192 if (err)193 goto error;194 ++vp_dev->msix_used_vectors;195 }196 return 0;197error:198 return err;199}200 201static bool vp_is_slow_path_vector(u16 msix_vec)202{203 return msix_vec == VP_MSIX_CONFIG_VECTOR;204}205 206static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned int index,207 void (*callback)(struct virtqueue *vq),208 const char *name,209 bool ctx,210 u16 msix_vec,211 struct virtio_pci_vq_info **p_info)212{213 struct virtio_pci_device *vp_dev = to_vp_device(vdev);214 struct virtio_pci_vq_info *info = kmalloc(sizeof *info, GFP_KERNEL);215 struct virtqueue *vq;216 unsigned long flags;217 218 /* fill out our structure that represents an active queue */219 if (!info)220 return ERR_PTR(-ENOMEM);221 222 vq = vp_dev->setup_vq(vp_dev, info, index, callback, name, ctx,223 msix_vec);224 if (IS_ERR(vq))225 goto out_info;226 227 info->vq = vq;228 if (callback) {229 spin_lock_irqsave(&vp_dev->lock, flags);230 if (!vp_is_slow_path_vector(msix_vec))231 list_add(&info->node, &vp_dev->virtqueues);232 else233 list_add(&info->node, &vp_dev->slow_virtqueues);234 spin_unlock_irqrestore(&vp_dev->lock, flags);235 } else {236 INIT_LIST_HEAD(&info->node);237 }238 239 *p_info = info;240 return vq;241 242out_info:243 kfree(info);244 return vq;245}246 247static void vp_del_vq(struct virtqueue *vq, struct virtio_pci_vq_info *info)248{249 struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);250 unsigned long flags;251 252 /*253 * If it fails during re-enable reset vq. This way we won't rejoin254 * info->node to the queue. Prevent unexpected irqs.255 */256 if (!vq->reset) {257 spin_lock_irqsave(&vp_dev->lock, flags);258 list_del(&info->node);259 spin_unlock_irqrestore(&vp_dev->lock, flags);260 }261 262 vp_dev->del_vq(info);263 kfree(info);264}265 266/* the config->del_vqs() implementation */267void vp_del_vqs(struct virtio_device *vdev)268{269 struct virtio_pci_device *vp_dev = to_vp_device(vdev);270 struct virtio_pci_vq_info *info;271 struct virtqueue *vq, *n;272 int i;273 274 list_for_each_entry_safe(vq, n, &vdev->vqs, list) {275 info = vp_is_avq(vdev, vq->index) ? vp_dev->admin_vq.info :276 vp_dev->vqs[vq->index];277 278 if (vp_dev->per_vq_vectors) {279 int v = info->msix_vector;280 if (v != VIRTIO_MSI_NO_VECTOR &&281 !vp_is_slow_path_vector(v)) {282 int irq = pci_irq_vector(vp_dev->pci_dev, v);283 284 irq_update_affinity_hint(irq, NULL);285 free_irq(irq, vq);286 }287 }288 vp_del_vq(vq, info);289 }290 vp_dev->per_vq_vectors = false;291 292 if (vp_dev->intx_enabled) {293 free_irq(vp_dev->pci_dev->irq, vp_dev);294 vp_dev->intx_enabled = 0;295 }296 297 for (i = 0; i < vp_dev->msix_used_vectors; ++i)298 free_irq(pci_irq_vector(vp_dev->pci_dev, i), vp_dev);299 300 if (vp_dev->msix_affinity_masks) {301 for (i = 0; i < vp_dev->msix_vectors; i++)302 free_cpumask_var(vp_dev->msix_affinity_masks[i]);303 }304 305 if (vp_dev->msix_enabled) {306 /* Disable the vector used for configuration */307 vp_dev->config_vector(vp_dev, VIRTIO_MSI_NO_VECTOR);308 309 pci_free_irq_vectors(vp_dev->pci_dev);310 vp_dev->msix_enabled = 0;311 }312 313 vp_dev->msix_vectors = 0;314 vp_dev->msix_used_vectors = 0;315 kfree(vp_dev->msix_names);316 vp_dev->msix_names = NULL;317 kfree(vp_dev->msix_affinity_masks);318 vp_dev->msix_affinity_masks = NULL;319 kfree(vp_dev->vqs);320 vp_dev->vqs = NULL;321}322 323enum vp_vq_vector_policy {324 VP_VQ_VECTOR_POLICY_EACH,325 VP_VQ_VECTOR_POLICY_SHARED_SLOW,326 VP_VQ_VECTOR_POLICY_SHARED,327};328 329static struct virtqueue *330vp_find_one_vq_msix(struct virtio_device *vdev, int queue_idx,331 vq_callback_t *callback, const char *name, bool ctx,332 bool slow_path, int *allocated_vectors,333 enum vp_vq_vector_policy vector_policy,334 struct virtio_pci_vq_info **p_info)335{336 struct virtio_pci_device *vp_dev = to_vp_device(vdev);337 struct virtqueue *vq;338 u16 msix_vec;339 int err;340 341 if (!callback)342 msix_vec = VIRTIO_MSI_NO_VECTOR;343 else if (vector_policy == VP_VQ_VECTOR_POLICY_EACH ||344 (vector_policy == VP_VQ_VECTOR_POLICY_SHARED_SLOW &&345 !slow_path))346 msix_vec = (*allocated_vectors)++;347 else if (vector_policy != VP_VQ_VECTOR_POLICY_EACH &&348 slow_path)349 msix_vec = VP_MSIX_CONFIG_VECTOR;350 else351 msix_vec = VP_MSIX_VQ_VECTOR;352 vq = vp_setup_vq(vdev, queue_idx, callback, name, ctx, msix_vec,353 p_info);354 if (IS_ERR(vq))355 return vq;356 357 if (vector_policy == VP_VQ_VECTOR_POLICY_SHARED ||358 msix_vec == VIRTIO_MSI_NO_VECTOR ||359 vp_is_slow_path_vector(msix_vec))360 return vq;361 362 /* allocate per-vq irq if available and necessary */363 snprintf(vp_dev->msix_names[msix_vec], sizeof(*vp_dev->msix_names),364 "%s-%s", dev_name(&vp_dev->vdev.dev), name);365 err = request_irq(pci_irq_vector(vp_dev->pci_dev, msix_vec),366 vring_interrupt, 0,367 vp_dev->msix_names[msix_vec], vq);368 if (err) {369 vp_del_vq(vq, *p_info);370 return ERR_PTR(err);371 }372 373 return vq;374}375 376static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned int nvqs,377 struct virtqueue *vqs[],378 struct virtqueue_info vqs_info[],379 enum vp_vq_vector_policy vector_policy,380 struct irq_affinity *desc)381{382 struct virtio_pci_device *vp_dev = to_vp_device(vdev);383 struct virtio_pci_admin_vq *avq = &vp_dev->admin_vq;384 struct virtqueue_info *vqi;385 int i, err, nvectors, allocated_vectors, queue_idx = 0;386 struct virtqueue *vq;387 bool per_vq_vectors;388 u16 avq_num = 0;389 390 vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL);391 if (!vp_dev->vqs)392 return -ENOMEM;393 394 if (vp_dev->avq_index) {395 err = vp_dev->avq_index(vdev, &avq->vq_index, &avq_num);396 if (err)397 goto error_find;398 }399 400 per_vq_vectors = vector_policy != VP_VQ_VECTOR_POLICY_SHARED;401 402 if (per_vq_vectors) {403 /* Best option: one for change interrupt, one per vq. */404 nvectors = 1;405 for (i = 0; i < nvqs; ++i) {406 vqi = &vqs_info[i];407 if (vqi->name && vqi->callback)408 ++nvectors;409 }410 if (avq_num && vector_policy == VP_VQ_VECTOR_POLICY_EACH)411 ++nvectors;412 } else {413 /* Second best: one for change, shared for all vqs. */414 nvectors = 2;415 }416 417 err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors, desc);418 if (err)419 goto error_find;420 421 vp_dev->per_vq_vectors = per_vq_vectors;422 allocated_vectors = vp_dev->msix_used_vectors;423 for (i = 0; i < nvqs; ++i) {424 vqi = &vqs_info[i];425 if (!vqi->name) {426 vqs[i] = NULL;427 continue;428 }429 vqs[i] = vp_find_one_vq_msix(vdev, queue_idx++, vqi->callback,430 vqi->name, vqi->ctx, false,431 &allocated_vectors, vector_policy,432 &vp_dev->vqs[i]);433 if (IS_ERR(vqs[i])) {434 err = PTR_ERR(vqs[i]);435 goto error_find;436 }437 }438 439 if (!avq_num)440 return 0;441 sprintf(avq->name, "avq.%u", avq->vq_index);442 vq = vp_find_one_vq_msix(vdev, avq->vq_index, vp_modern_avq_done,443 avq->name, false, true, &allocated_vectors,444 vector_policy, &vp_dev->admin_vq.info);445 if (IS_ERR(vq)) {446 err = PTR_ERR(vq);447 goto error_find;448 }449 450 return 0;451 452error_find:453 vp_del_vqs(vdev);454 return err;455}456 457static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned int nvqs,458 struct virtqueue *vqs[],459 struct virtqueue_info vqs_info[])460{461 struct virtio_pci_device *vp_dev = to_vp_device(vdev);462 struct virtio_pci_admin_vq *avq = &vp_dev->admin_vq;463 int i, err, queue_idx = 0;464 struct virtqueue *vq;465 u16 avq_num = 0;466 467 vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL);468 if (!vp_dev->vqs)469 return -ENOMEM;470 471 if (vp_dev->avq_index) {472 err = vp_dev->avq_index(vdev, &avq->vq_index, &avq_num);473 if (err)474 goto out_del_vqs;475 }476 477 err = request_irq(vp_dev->pci_dev->irq, vp_interrupt, IRQF_SHARED,478 dev_name(&vdev->dev), vp_dev);479 if (err)480 goto out_del_vqs;481 482 vp_dev->intx_enabled = 1;483 vp_dev->per_vq_vectors = false;484 for (i = 0; i < nvqs; ++i) {485 struct virtqueue_info *vqi = &vqs_info[i];486 487 if (!vqi->name) {488 vqs[i] = NULL;489 continue;490 }491 vqs[i] = vp_setup_vq(vdev, queue_idx++, vqi->callback,492 vqi->name, vqi->ctx,493 VIRTIO_MSI_NO_VECTOR, &vp_dev->vqs[i]);494 if (IS_ERR(vqs[i])) {495 err = PTR_ERR(vqs[i]);496 goto out_del_vqs;497 }498 }499 500 if (!avq_num)501 return 0;502 sprintf(avq->name, "avq.%u", avq->vq_index);503 vq = vp_setup_vq(vdev, queue_idx++, vp_modern_avq_done, avq->name,504 false, VIRTIO_MSI_NO_VECTOR,505 &vp_dev->admin_vq.info);506 if (IS_ERR(vq)) {507 err = PTR_ERR(vq);508 goto out_del_vqs;509 }510 511 return 0;512out_del_vqs:513 vp_del_vqs(vdev);514 return err;515}516 517/* the config->find_vqs() implementation */518int vp_find_vqs(struct virtio_device *vdev, unsigned int nvqs,519 struct virtqueue *vqs[], struct virtqueue_info vqs_info[],520 struct irq_affinity *desc)521{522 int err;523 524 /* Try MSI-X with one vector per queue. */525 err = vp_find_vqs_msix(vdev, nvqs, vqs, vqs_info,526 VP_VQ_VECTOR_POLICY_EACH, desc);527 if (!err)528 return 0;529 /* Fallback: MSI-X with one shared vector for config and530 * slow path queues, one vector per queue for the rest.531 */532 err = vp_find_vqs_msix(vdev, nvqs, vqs, vqs_info,533 VP_VQ_VECTOR_POLICY_SHARED_SLOW, desc);534 if (!err)535 return 0;536 /* Fallback: MSI-X with one vector for config, one shared for queues. */537 err = vp_find_vqs_msix(vdev, nvqs, vqs, vqs_info,538 VP_VQ_VECTOR_POLICY_SHARED, desc);539 if (!err)540 return 0;541 /* Is there an interrupt? If not give up. */542 if (!(to_vp_device(vdev)->pci_dev->irq))543 return err;544 /* Finally fall back to regular interrupts. */545 return vp_find_vqs_intx(vdev, nvqs, vqs, vqs_info);546}547 548const char *vp_bus_name(struct virtio_device *vdev)549{550 struct virtio_pci_device *vp_dev = to_vp_device(vdev);551 552 return pci_name(vp_dev->pci_dev);553}554 555/* Setup the affinity for a virtqueue:556 * - force the affinity for per vq vector557 * - OR over all affinities for shared MSI558 * - ignore the affinity request if we're using INTX559 */560int vp_set_vq_affinity(struct virtqueue *vq, const struct cpumask *cpu_mask)561{562 struct virtio_device *vdev = vq->vdev;563 struct virtio_pci_device *vp_dev = to_vp_device(vdev);564 struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];565 struct cpumask *mask;566 unsigned int irq;567 568 if (!vq->callback)569 return -EINVAL;570 571 if (vp_dev->msix_enabled) {572 mask = vp_dev->msix_affinity_masks[info->msix_vector];573 irq = pci_irq_vector(vp_dev->pci_dev, info->msix_vector);574 if (!cpu_mask)575 irq_update_affinity_hint(irq, NULL);576 else {577 cpumask_copy(mask, cpu_mask);578 irq_set_affinity_and_hint(irq, mask);579 }580 }581 return 0;582}583 584const struct cpumask *vp_get_vq_affinity(struct virtio_device *vdev, int index)585{586 struct virtio_pci_device *vp_dev = to_vp_device(vdev);587 588 if (!vp_dev->per_vq_vectors ||589 vp_dev->vqs[index]->msix_vector == VIRTIO_MSI_NO_VECTOR ||590 vp_is_slow_path_vector(vp_dev->vqs[index]->msix_vector))591 return NULL;592 593 return pci_irq_get_affinity(vp_dev->pci_dev,594 vp_dev->vqs[index]->msix_vector);595}596 597#ifdef CONFIG_PM_SLEEP598static int virtio_pci_freeze(struct device *dev)599{600 struct pci_dev *pci_dev = to_pci_dev(dev);601 struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);602 int ret;603 604 ret = virtio_device_freeze(&vp_dev->vdev);605 606 if (!ret)607 pci_disable_device(pci_dev);608 return ret;609}610 611static int virtio_pci_restore(struct device *dev)612{613 struct pci_dev *pci_dev = to_pci_dev(dev);614 struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);615 int ret;616 617 ret = pci_enable_device(pci_dev);618 if (ret)619 return ret;620 621 pci_set_master(pci_dev);622 return virtio_device_restore(&vp_dev->vdev);623}624 625static bool vp_supports_pm_no_reset(struct device *dev)626{627 struct pci_dev *pci_dev = to_pci_dev(dev);628 u16 pmcsr;629 630 if (!pci_dev->pm_cap)631 return false;632 633 pci_read_config_word(pci_dev, pci_dev->pm_cap + PCI_PM_CTRL, &pmcsr);634 if (PCI_POSSIBLE_ERROR(pmcsr)) {635 dev_err(dev, "Unable to query pmcsr");636 return false;637 }638 639 return pmcsr & PCI_PM_CTRL_NO_SOFT_RESET;640}641 642static int virtio_pci_suspend(struct device *dev)643{644 return vp_supports_pm_no_reset(dev) ? 0 : virtio_pci_freeze(dev);645}646 647static int virtio_pci_resume(struct device *dev)648{649 return vp_supports_pm_no_reset(dev) ? 0 : virtio_pci_restore(dev);650}651 652static const struct dev_pm_ops virtio_pci_pm_ops = {653 .suspend = virtio_pci_suspend,654 .resume = virtio_pci_resume,655 .freeze = virtio_pci_freeze,656 .thaw = virtio_pci_restore,657 .poweroff = virtio_pci_freeze,658 .restore = virtio_pci_restore,659};660#endif661 662 663/* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */664static const struct pci_device_id virtio_pci_id_table[] = {665 { PCI_DEVICE(PCI_VENDOR_ID_REDHAT_QUMRANET, PCI_ANY_ID) },666 { 0 }667};668 669MODULE_DEVICE_TABLE(pci, virtio_pci_id_table);670 671static void virtio_pci_release_dev(struct device *_d)672{673 struct virtio_device *vdev = dev_to_virtio(_d);674 struct virtio_pci_device *vp_dev = to_vp_device(vdev);675 676 /* As struct device is a kobject, it's not safe to677 * free the memory (including the reference counter itself)678 * until it's release callback. */679 kfree(vp_dev);680}681 682static int virtio_pci_probe(struct pci_dev *pci_dev,683 const struct pci_device_id *id)684{685 struct virtio_pci_device *vp_dev, *reg_dev = NULL;686 int rc;687 688 /* allocate our structure and fill it out */689 vp_dev = kzalloc(sizeof(struct virtio_pci_device), GFP_KERNEL);690 if (!vp_dev)691 return -ENOMEM;692 693 pci_set_drvdata(pci_dev, vp_dev);694 vp_dev->vdev.dev.parent = &pci_dev->dev;695 vp_dev->vdev.dev.release = virtio_pci_release_dev;696 vp_dev->pci_dev = pci_dev;697 INIT_LIST_HEAD(&vp_dev->virtqueues);698 INIT_LIST_HEAD(&vp_dev->slow_virtqueues);699 spin_lock_init(&vp_dev->lock);700 701 /* enable the device */702 rc = pci_enable_device(pci_dev);703 if (rc)704 goto err_enable_device;705 706 if (force_legacy) {707 rc = virtio_pci_legacy_probe(vp_dev);708 /* Also try modern mode if we can't map BAR0 (no IO space). */709 if (rc == -ENODEV || rc == -ENOMEM)710 rc = virtio_pci_modern_probe(vp_dev);711 if (rc)712 goto err_probe;713 } else {714 rc = virtio_pci_modern_probe(vp_dev);715 if (rc == -ENODEV)716 rc = virtio_pci_legacy_probe(vp_dev);717 if (rc)718 goto err_probe;719 }720 721 pci_set_master(pci_dev);722 723 rc = register_virtio_device(&vp_dev->vdev);724 reg_dev = vp_dev;725 if (rc)726 goto err_register;727 728 return 0;729 730err_register:731 if (vp_dev->is_legacy)732 virtio_pci_legacy_remove(vp_dev);733 else734 virtio_pci_modern_remove(vp_dev);735err_probe:736 pci_disable_device(pci_dev);737err_enable_device:738 if (reg_dev)739 put_device(&vp_dev->vdev.dev);740 else741 kfree(vp_dev);742 return rc;743}744 745static void virtio_pci_remove(struct pci_dev *pci_dev)746{747 struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);748 struct device *dev = get_device(&vp_dev->vdev.dev);749 750 /*751 * Device is marked broken on surprise removal so that virtio upper752 * layers can abort any ongoing operation.753 */754 if (!pci_device_is_present(pci_dev))755 virtio_break_device(&vp_dev->vdev);756 757 pci_disable_sriov(pci_dev);758 759 unregister_virtio_device(&vp_dev->vdev);760 761 if (vp_dev->is_legacy)762 virtio_pci_legacy_remove(vp_dev);763 else764 virtio_pci_modern_remove(vp_dev);765 766 pci_disable_device(pci_dev);767 put_device(dev);768}769 770static int virtio_pci_sriov_configure(struct pci_dev *pci_dev, int num_vfs)771{772 struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);773 struct virtio_device *vdev = &vp_dev->vdev;774 int ret;775 776 if (!(vdev->config->get_status(vdev) & VIRTIO_CONFIG_S_DRIVER_OK))777 return -EBUSY;778 779 if (!__virtio_test_bit(vdev, VIRTIO_F_SR_IOV))780 return -EINVAL;781 782 if (pci_vfs_assigned(pci_dev))783 return -EPERM;784 785 if (num_vfs == 0) {786 pci_disable_sriov(pci_dev);787 return 0;788 }789 790 ret = pci_enable_sriov(pci_dev, num_vfs);791 if (ret < 0)792 return ret;793 794 return num_vfs;795}796 797static struct pci_driver virtio_pci_driver = {798 .name = "virtio-pci",799 .id_table = virtio_pci_id_table,800 .probe = virtio_pci_probe,801 .remove = virtio_pci_remove,802#ifdef CONFIG_PM_SLEEP803 .driver.pm = &virtio_pci_pm_ops,804#endif805 .sriov_configure = virtio_pci_sriov_configure,806};807 808struct virtio_device *virtio_pci_vf_get_pf_dev(struct pci_dev *pdev)809{810 struct virtio_pci_device *pf_vp_dev;811 812 pf_vp_dev = pci_iov_get_pf_drvdata(pdev, &virtio_pci_driver);813 if (IS_ERR(pf_vp_dev))814 return NULL;815 816 return &pf_vp_dev->vdev;817}818 819module_pci_driver(virtio_pci_driver);820 821MODULE_AUTHOR("Anthony Liguori <aliguori@us.ibm.com>");822MODULE_DESCRIPTION("virtio-pci");823MODULE_LICENSE("GPL");824MODULE_VERSION("1");825