![Jan Beulich](/assets/img/avatar_default.png)
This is a minor bugfix and a set of small cleanups; as it is not clear whether this needs splitting into pieces (and if so, at what granularity), it is a single combined patch. - add a missing return statement to an error path in kill_domain_by_device() - use pci_is_enabled() rather than raw atomic_read() - remove a bogus attempt to zero-terminate an already zero-terminated string - #define DRV_NAME once uniformly in the shared local header - make DRIVER_ATTR() variables static - eliminate a pointless use of list_for_each_entry_safe() - add MODULE_ALIAS() - a little bit of constification - adjust a few messages - remove stray semicolons from inline function definitions Signed-off-by: Jan Beulich <jbeulich@suse.com> [v1: Dropped the resource_size fix, altered the description] [v2: Fixed cleanpatch.pl comments] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
189 lines
4.6 KiB
C
189 lines
4.6 KiB
C
/*
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* PCI Backend - Provides restricted access to the real PCI bus topology
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* to the frontend
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*
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* Author: Ryan Wilson <hap9@epoch.ncsc.mil>
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*/
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#include <linux/list.h>
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#include <linux/pci.h>
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#include <linux/mutex.h>
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#include "pciback.h"
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struct passthrough_dev_data {
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/* Access to dev_list must be protected by lock */
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struct list_head dev_list;
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struct mutex lock;
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};
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static struct pci_dev *__xen_pcibk_get_pci_dev(struct xen_pcibk_device *pdev,
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unsigned int domain,
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unsigned int bus,
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unsigned int devfn)
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{
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struct passthrough_dev_data *dev_data = pdev->pci_dev_data;
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struct pci_dev_entry *dev_entry;
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struct pci_dev *dev = NULL;
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mutex_lock(&dev_data->lock);
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list_for_each_entry(dev_entry, &dev_data->dev_list, list) {
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if (domain == (unsigned int)pci_domain_nr(dev_entry->dev->bus)
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&& bus == (unsigned int)dev_entry->dev->bus->number
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&& devfn == dev_entry->dev->devfn) {
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dev = dev_entry->dev;
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break;
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}
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}
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mutex_unlock(&dev_data->lock);
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return dev;
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}
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static int __xen_pcibk_add_pci_dev(struct xen_pcibk_device *pdev,
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struct pci_dev *dev,
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int devid, publish_pci_dev_cb publish_cb)
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{
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struct passthrough_dev_data *dev_data = pdev->pci_dev_data;
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struct pci_dev_entry *dev_entry;
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unsigned int domain, bus, devfn;
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int err;
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dev_entry = kmalloc(sizeof(*dev_entry), GFP_KERNEL);
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if (!dev_entry)
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return -ENOMEM;
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dev_entry->dev = dev;
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mutex_lock(&dev_data->lock);
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list_add_tail(&dev_entry->list, &dev_data->dev_list);
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mutex_unlock(&dev_data->lock);
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/* Publish this device. */
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domain = (unsigned int)pci_domain_nr(dev->bus);
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bus = (unsigned int)dev->bus->number;
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devfn = dev->devfn;
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err = publish_cb(pdev, domain, bus, devfn, devid);
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return err;
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}
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static void __xen_pcibk_release_pci_dev(struct xen_pcibk_device *pdev,
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struct pci_dev *dev)
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{
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struct passthrough_dev_data *dev_data = pdev->pci_dev_data;
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struct pci_dev_entry *dev_entry, *t;
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struct pci_dev *found_dev = NULL;
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mutex_lock(&dev_data->lock);
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list_for_each_entry_safe(dev_entry, t, &dev_data->dev_list, list) {
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if (dev_entry->dev == dev) {
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list_del(&dev_entry->list);
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found_dev = dev_entry->dev;
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kfree(dev_entry);
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}
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}
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mutex_unlock(&dev_data->lock);
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if (found_dev)
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pcistub_put_pci_dev(found_dev);
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}
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static int __xen_pcibk_init_devices(struct xen_pcibk_device *pdev)
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{
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struct passthrough_dev_data *dev_data;
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dev_data = kmalloc(sizeof(*dev_data), GFP_KERNEL);
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if (!dev_data)
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return -ENOMEM;
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mutex_init(&dev_data->lock);
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INIT_LIST_HEAD(&dev_data->dev_list);
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pdev->pci_dev_data = dev_data;
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return 0;
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}
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static int __xen_pcibk_publish_pci_roots(struct xen_pcibk_device *pdev,
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publish_pci_root_cb publish_root_cb)
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{
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int err = 0;
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struct passthrough_dev_data *dev_data = pdev->pci_dev_data;
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struct pci_dev_entry *dev_entry, *e;
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struct pci_dev *dev;
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int found;
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unsigned int domain, bus;
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mutex_lock(&dev_data->lock);
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list_for_each_entry(dev_entry, &dev_data->dev_list, list) {
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/* Only publish this device as a root if none of its
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* parent bridges are exported
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*/
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found = 0;
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dev = dev_entry->dev->bus->self;
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for (; !found && dev != NULL; dev = dev->bus->self) {
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list_for_each_entry(e, &dev_data->dev_list, list) {
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if (dev == e->dev) {
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found = 1;
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break;
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}
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}
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}
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domain = (unsigned int)pci_domain_nr(dev_entry->dev->bus);
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bus = (unsigned int)dev_entry->dev->bus->number;
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if (!found) {
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err = publish_root_cb(pdev, domain, bus);
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if (err)
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break;
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}
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}
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mutex_unlock(&dev_data->lock);
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return err;
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}
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static void __xen_pcibk_release_devices(struct xen_pcibk_device *pdev)
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{
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struct passthrough_dev_data *dev_data = pdev->pci_dev_data;
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struct pci_dev_entry *dev_entry, *t;
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list_for_each_entry_safe(dev_entry, t, &dev_data->dev_list, list) {
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list_del(&dev_entry->list);
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pcistub_put_pci_dev(dev_entry->dev);
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kfree(dev_entry);
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}
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kfree(dev_data);
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pdev->pci_dev_data = NULL;
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}
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static int __xen_pcibk_get_pcifront_dev(struct pci_dev *pcidev,
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struct xen_pcibk_device *pdev,
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unsigned int *domain, unsigned int *bus,
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unsigned int *devfn)
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{
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*domain = pci_domain_nr(pcidev->bus);
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*bus = pcidev->bus->number;
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*devfn = pcidev->devfn;
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return 1;
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}
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const struct xen_pcibk_backend xen_pcibk_passthrough_backend = {
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.name = "passthrough",
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.init = __xen_pcibk_init_devices,
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.free = __xen_pcibk_release_devices,
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.find = __xen_pcibk_get_pcifront_dev,
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.publish = __xen_pcibk_publish_pci_roots,
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.release = __xen_pcibk_release_pci_dev,
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.add = __xen_pcibk_add_pci_dev,
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.get = __xen_pcibk_get_pci_dev,
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};
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