xen/pciback: Support pci_reset_function, aka FLR or D3 support.
We use the __pci_reset_function_locked to perform the action. Also on attaching ("bind") and detaching ("unbind") we save and restore the configuration states. When the device is disconnected from a guest we use the "pci_reset_function" to also reset the device before being passed to another guest. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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@ -85,19 +85,34 @@ static struct pcistub_device *pcistub_device_alloc(struct pci_dev *dev)
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static void pcistub_device_release(struct kref *kref)
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{
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struct pcistub_device *psdev;
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struct xen_pcibk_dev_data *dev_data;
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psdev = container_of(kref, struct pcistub_device, kref);
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dev_data = pci_get_drvdata(psdev->dev);
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dev_dbg(&psdev->dev->dev, "pcistub_device_release\n");
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xen_unregister_device_domain_owner(psdev->dev);
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/* Clean-up the device */
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/* Call the reset function which does not take lock as this
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* is called from "unbind" which takes a device_lock mutex.
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*/
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__pci_reset_function_locked(psdev->dev);
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if (pci_load_and_free_saved_state(psdev->dev,
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&dev_data->pci_saved_state)) {
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dev_dbg(&psdev->dev->dev, "Could not reload PCI state\n");
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} else
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pci_restore_state(psdev->dev);
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/* Disable the device */
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xen_pcibk_reset_device(psdev->dev);
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kfree(dev_data);
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pci_set_drvdata(psdev->dev, NULL);
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/* Clean-up the device */
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xen_pcibk_config_free_dyn_fields(psdev->dev);
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xen_pcibk_config_free_dev(psdev->dev);
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kfree(pci_get_drvdata(psdev->dev));
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pci_set_drvdata(psdev->dev, NULL);
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psdev->dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
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pci_dev_put(psdev->dev);
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@ -231,7 +246,17 @@ void pcistub_put_pci_dev(struct pci_dev *dev)
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/* Cleanup our device
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* (so it's ready for the next domain)
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*/
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/* This is OK - we are running from workqueue context
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* and want to inhibit the user from fiddling with 'reset'
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*/
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pci_reset_function(dev);
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pci_restore_state(psdev->dev);
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/* This disables the device. */
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xen_pcibk_reset_device(found_psdev->dev);
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/* And cleanup up our emulated fields. */
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xen_pcibk_config_free_dyn_fields(found_psdev->dev);
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xen_pcibk_config_reset_dev(found_psdev->dev);
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@ -328,6 +353,16 @@ static int __devinit pcistub_init_device(struct pci_dev *dev)
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if (err)
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goto config_release;
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dev_dbg(&dev->dev, "reseting (FLR, D3, etc) the device\n");
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__pci_reset_function_locked(dev);
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/* We need the device active to save the state. */
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dev_dbg(&dev->dev, "save state of device\n");
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pci_save_state(dev);
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dev_data->pci_saved_state = pci_store_saved_state(dev);
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if (!dev_data->pci_saved_state)
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dev_err(&dev->dev, "Could not store PCI conf saved state!\n");
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/* Now disable the device (this also ensures some private device
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* data is setup before we export)
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*/
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@ -41,6 +41,7 @@ struct xen_pcibk_device {
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struct xen_pcibk_dev_data {
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struct list_head config_fields;
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struct pci_saved_state *pci_saved_state;
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unsigned int permissive:1;
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unsigned int warned_on_write:1;
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unsigned int enable_intx:1;
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