Commit 8be9df6d authored by Konrad Rzeszutek Wilk's avatar Konrad Rzeszutek Wilk

xen-pciback: Document when we FLR an PCI device.

When the toolstack wants us to drop or add an PCI device it
changes the XenBus state to Configuring - and as result of that
we find out which devices we should still be exporting out and
which ones not. For the ones we don't need anymore we need to
do an PCI reset so that it is ready for the next guest.
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
parent fcb8ce96
...@@ -551,6 +551,8 @@ static void pcistub_remove(struct pci_dev *dev) ...@@ -551,6 +551,8 @@ static void pcistub_remove(struct pci_dev *dev)
pr_warn("****** shutdown driver domain before binding device\n"); pr_warn("****** shutdown driver domain before binding device\n");
pr_warn("****** to other drivers or domains\n"); pr_warn("****** to other drivers or domains\n");
/* N.B. This ends up calling pcistub_put_pci_dev which ends up
* doing the FLR. */
xen_pcibk_release_pci_dev(found_psdev->pdev, xen_pcibk_release_pci_dev(found_psdev->pdev,
found_psdev->dev); found_psdev->dev);
} }
......
...@@ -93,6 +93,8 @@ static void free_pdev(struct xen_pcibk_device *pdev) ...@@ -93,6 +93,8 @@ static void free_pdev(struct xen_pcibk_device *pdev)
xen_pcibk_disconnect(pdev); xen_pcibk_disconnect(pdev);
/* N.B. This calls pcistub_put_pci_dev which does the FLR on all
* of the PCIe devices. */
xen_pcibk_release_devices(pdev); xen_pcibk_release_devices(pdev);
dev_set_drvdata(&pdev->xdev->dev, NULL); dev_set_drvdata(&pdev->xdev->dev, NULL);
...@@ -286,6 +288,8 @@ static int xen_pcibk_remove_device(struct xen_pcibk_device *pdev, ...@@ -286,6 +288,8 @@ static int xen_pcibk_remove_device(struct xen_pcibk_device *pdev,
dev_dbg(&dev->dev, "unregistering for %d\n", pdev->xdev->otherend_id); dev_dbg(&dev->dev, "unregistering for %d\n", pdev->xdev->otherend_id);
xen_unregister_device_domain_owner(dev); xen_unregister_device_domain_owner(dev);
/* N.B. This ends up calling pcistub_put_pci_dev which ends up
* doing the FLR. */
xen_pcibk_release_pci_dev(pdev, dev); xen_pcibk_release_pci_dev(pdev, dev);
out: out:
......
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