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![Juergen Gross](/assets/img/avatar_default.png)
Today a Xenstore watch event is delivered via a callback function declared as: void (*callback)(struct xenbus_watch *, const char **vec, unsigned int len); As all watch events only ever come with two parameters (path and token) changing the prototype to: void (*callback)(struct xenbus_watch *, const char *path, const char *token); is the natural thing to do. Apply this change and adapt all users. Cc: konrad.wilk@oracle.com Cc: roger.pau@citrix.com Cc: wei.liu2@citrix.com Cc: paul.durrant@citrix.com Cc: netdev@vger.kernel.org Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Paul Durrant <paul.durrant@citrix.com> Reviewed-by: Wei Liu <wei.liu2@citrix.com> Reviewed-by: Roger Pau Monné <roger.pau@citrix.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
742 lines
18 KiB
C
742 lines
18 KiB
C
/*
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* PCI Backend Xenbus Setup - handles setup with frontend and xend
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*
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* Author: Ryan Wilson <hap9@epoch.ncsc.mil>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/vmalloc.h>
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#include <linux/workqueue.h>
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#include <xen/xenbus.h>
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#include <xen/events.h>
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#include <asm/xen/pci.h>
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#include "pciback.h"
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#define INVALID_EVTCHN_IRQ (-1)
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static bool __read_mostly passthrough;
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module_param(passthrough, bool, S_IRUGO);
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MODULE_PARM_DESC(passthrough,
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"Option to specify how to export PCI topology to guest:\n"\
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" 0 - (default) Hide the true PCI topology and makes the frontend\n"\
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" there is a single PCI bus with only the exported devices on it.\n"\
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" For example, a device at 03:05.0 will be re-assigned to 00:00.0\n"\
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" while second device at 02:1a.1 will be re-assigned to 00:01.1.\n"\
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" 1 - Passthrough provides a real view of the PCI topology to the\n"\
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" frontend (for example, a device at 06:01.b will still appear at\n"\
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" 06:01.b to the frontend). This is similar to how Xen 2.0.x\n"\
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" exposed PCI devices to its driver domains. This may be required\n"\
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" for drivers which depend on finding their hardward in certain\n"\
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" bus/slot locations.");
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static struct xen_pcibk_device *alloc_pdev(struct xenbus_device *xdev)
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{
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struct xen_pcibk_device *pdev;
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pdev = kzalloc(sizeof(struct xen_pcibk_device), GFP_KERNEL);
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if (pdev == NULL)
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goto out;
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dev_dbg(&xdev->dev, "allocated pdev @ 0x%p\n", pdev);
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pdev->xdev = xdev;
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mutex_init(&pdev->dev_lock);
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pdev->sh_info = NULL;
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pdev->evtchn_irq = INVALID_EVTCHN_IRQ;
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pdev->be_watching = 0;
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INIT_WORK(&pdev->op_work, xen_pcibk_do_op);
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if (xen_pcibk_init_devices(pdev)) {
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kfree(pdev);
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pdev = NULL;
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}
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dev_set_drvdata(&xdev->dev, pdev);
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out:
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return pdev;
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}
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static void xen_pcibk_disconnect(struct xen_pcibk_device *pdev)
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{
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mutex_lock(&pdev->dev_lock);
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/* Ensure the guest can't trigger our handler before removing devices */
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if (pdev->evtchn_irq != INVALID_EVTCHN_IRQ) {
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unbind_from_irqhandler(pdev->evtchn_irq, pdev);
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pdev->evtchn_irq = INVALID_EVTCHN_IRQ;
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}
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/* If the driver domain started an op, make sure we complete it
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* before releasing the shared memory */
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flush_work(&pdev->op_work);
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if (pdev->sh_info != NULL) {
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xenbus_unmap_ring_vfree(pdev->xdev, pdev->sh_info);
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pdev->sh_info = NULL;
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}
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mutex_unlock(&pdev->dev_lock);
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}
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static void free_pdev(struct xen_pcibk_device *pdev)
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{
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if (pdev->be_watching) {
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unregister_xenbus_watch(&pdev->be_watch);
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pdev->be_watching = 0;
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}
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xen_pcibk_disconnect(pdev);
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/* N.B. This calls pcistub_put_pci_dev which does the FLR on all
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* of the PCIe devices. */
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xen_pcibk_release_devices(pdev);
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dev_set_drvdata(&pdev->xdev->dev, NULL);
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pdev->xdev = NULL;
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kfree(pdev);
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}
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static int xen_pcibk_do_attach(struct xen_pcibk_device *pdev, int gnt_ref,
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int remote_evtchn)
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{
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int err = 0;
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void *vaddr;
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dev_dbg(&pdev->xdev->dev,
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"Attaching to frontend resources - gnt_ref=%d evtchn=%d\n",
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gnt_ref, remote_evtchn);
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err = xenbus_map_ring_valloc(pdev->xdev, &gnt_ref, 1, &vaddr);
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if (err < 0) {
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xenbus_dev_fatal(pdev->xdev, err,
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"Error mapping other domain page in ours.");
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goto out;
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}
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pdev->sh_info = vaddr;
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err = bind_interdomain_evtchn_to_irqhandler(
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pdev->xdev->otherend_id, remote_evtchn, xen_pcibk_handle_event,
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0, DRV_NAME, pdev);
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if (err < 0) {
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xenbus_dev_fatal(pdev->xdev, err,
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"Error binding event channel to IRQ");
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goto out;
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}
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pdev->evtchn_irq = err;
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err = 0;
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dev_dbg(&pdev->xdev->dev, "Attached!\n");
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out:
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return err;
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}
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static int xen_pcibk_attach(struct xen_pcibk_device *pdev)
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{
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int err = 0;
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int gnt_ref, remote_evtchn;
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char *magic = NULL;
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mutex_lock(&pdev->dev_lock);
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/* Make sure we only do this setup once */
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if (xenbus_read_driver_state(pdev->xdev->nodename) !=
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XenbusStateInitialised)
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goto out;
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/* Wait for frontend to state that it has published the configuration */
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if (xenbus_read_driver_state(pdev->xdev->otherend) !=
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XenbusStateInitialised)
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goto out;
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dev_dbg(&pdev->xdev->dev, "Reading frontend config\n");
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err = xenbus_gather(XBT_NIL, pdev->xdev->otherend,
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"pci-op-ref", "%u", &gnt_ref,
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"event-channel", "%u", &remote_evtchn,
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"magic", NULL, &magic, NULL);
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if (err) {
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/* If configuration didn't get read correctly, wait longer */
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xenbus_dev_fatal(pdev->xdev, err,
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"Error reading configuration from frontend");
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goto out;
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}
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if (magic == NULL || strcmp(magic, XEN_PCI_MAGIC) != 0) {
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xenbus_dev_fatal(pdev->xdev, -EFAULT,
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"version mismatch (%s/%s) with pcifront - "
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"halting " DRV_NAME,
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magic, XEN_PCI_MAGIC);
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err = -EFAULT;
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goto out;
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}
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err = xen_pcibk_do_attach(pdev, gnt_ref, remote_evtchn);
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if (err)
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goto out;
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dev_dbg(&pdev->xdev->dev, "Connecting...\n");
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err = xenbus_switch_state(pdev->xdev, XenbusStateConnected);
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if (err)
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xenbus_dev_fatal(pdev->xdev, err,
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"Error switching to connected state!");
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dev_dbg(&pdev->xdev->dev, "Connected? %d\n", err);
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out:
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mutex_unlock(&pdev->dev_lock);
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kfree(magic);
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return err;
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}
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static int xen_pcibk_publish_pci_dev(struct xen_pcibk_device *pdev,
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unsigned int domain, unsigned int bus,
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unsigned int devfn, unsigned int devid)
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{
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int err;
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int len;
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char str[64];
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len = snprintf(str, sizeof(str), "vdev-%d", devid);
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if (unlikely(len >= (sizeof(str) - 1))) {
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err = -ENOMEM;
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goto out;
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}
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/* Note: The PV protocol uses %02x, don't change it */
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err = xenbus_printf(XBT_NIL, pdev->xdev->nodename, str,
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"%04x:%02x:%02x.%02x", domain, bus,
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PCI_SLOT(devfn), PCI_FUNC(devfn));
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out:
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return err;
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}
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static int xen_pcibk_export_device(struct xen_pcibk_device *pdev,
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int domain, int bus, int slot, int func,
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int devid)
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{
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struct pci_dev *dev;
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int err = 0;
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dev_dbg(&pdev->xdev->dev, "exporting dom %x bus %x slot %x func %x\n",
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domain, bus, slot, func);
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dev = pcistub_get_pci_dev_by_slot(pdev, domain, bus, slot, func);
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if (!dev) {
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err = -EINVAL;
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xenbus_dev_fatal(pdev->xdev, err,
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"Couldn't locate PCI device "
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"(%04x:%02x:%02x.%d)! "
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"perhaps already in-use?",
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domain, bus, slot, func);
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goto out;
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}
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err = xen_pcibk_add_pci_dev(pdev, dev, devid,
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xen_pcibk_publish_pci_dev);
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if (err)
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goto out;
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dev_info(&dev->dev, "registering for %d\n", pdev->xdev->otherend_id);
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if (xen_register_device_domain_owner(dev,
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pdev->xdev->otherend_id) != 0) {
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dev_err(&dev->dev, "Stealing ownership from dom%d.\n",
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xen_find_device_domain_owner(dev));
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xen_unregister_device_domain_owner(dev);
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xen_register_device_domain_owner(dev, pdev->xdev->otherend_id);
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}
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/* TODO: It'd be nice to export a bridge and have all of its children
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* get exported with it. This may be best done in xend (which will
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* have to calculate resource usage anyway) but we probably want to
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* put something in here to ensure that if a bridge gets given to a
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* driver domain, that all devices under that bridge are not given
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* to other driver domains (as he who controls the bridge can disable
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* it and stop the other devices from working).
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*/
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out:
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return err;
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}
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static int xen_pcibk_remove_device(struct xen_pcibk_device *pdev,
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int domain, int bus, int slot, int func)
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{
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int err = 0;
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struct pci_dev *dev;
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dev_dbg(&pdev->xdev->dev, "removing dom %x bus %x slot %x func %x\n",
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domain, bus, slot, func);
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dev = xen_pcibk_get_pci_dev(pdev, domain, bus, PCI_DEVFN(slot, func));
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if (!dev) {
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err = -EINVAL;
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dev_dbg(&pdev->xdev->dev, "Couldn't locate PCI device "
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"(%04x:%02x:%02x.%d)! not owned by this domain\n",
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domain, bus, slot, func);
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goto out;
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}
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dev_dbg(&dev->dev, "unregistering for %d\n", pdev->xdev->otherend_id);
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xen_unregister_device_domain_owner(dev);
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/* N.B. This ends up calling pcistub_put_pci_dev which ends up
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* doing the FLR. */
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xen_pcibk_release_pci_dev(pdev, dev, true /* use the lock. */);
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out:
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return err;
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}
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static int xen_pcibk_publish_pci_root(struct xen_pcibk_device *pdev,
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unsigned int domain, unsigned int bus)
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{
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unsigned int d, b;
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int i, root_num, len, err;
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char str[64];
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dev_dbg(&pdev->xdev->dev, "Publishing pci roots\n");
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err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename,
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"root_num", "%d", &root_num);
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if (err == 0 || err == -ENOENT)
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root_num = 0;
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else if (err < 0)
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goto out;
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/* Verify that we haven't already published this pci root */
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for (i = 0; i < root_num; i++) {
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len = snprintf(str, sizeof(str), "root-%d", i);
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if (unlikely(len >= (sizeof(str) - 1))) {
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err = -ENOMEM;
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goto out;
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}
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err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename,
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str, "%x:%x", &d, &b);
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if (err < 0)
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goto out;
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if (err != 2) {
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err = -EINVAL;
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goto out;
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}
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if (d == domain && b == bus) {
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err = 0;
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goto out;
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}
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}
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len = snprintf(str, sizeof(str), "root-%d", root_num);
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if (unlikely(len >= (sizeof(str) - 1))) {
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err = -ENOMEM;
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goto out;
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}
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dev_dbg(&pdev->xdev->dev, "writing root %d at %04x:%02x\n",
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root_num, domain, bus);
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err = xenbus_printf(XBT_NIL, pdev->xdev->nodename, str,
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"%04x:%02x", domain, bus);
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if (err)
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goto out;
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err = xenbus_printf(XBT_NIL, pdev->xdev->nodename,
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"root_num", "%d", (root_num + 1));
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out:
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return err;
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}
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static int xen_pcibk_reconfigure(struct xen_pcibk_device *pdev)
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{
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int err = 0;
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int num_devs;
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int domain, bus, slot, func;
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unsigned int substate;
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int i, len;
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char state_str[64];
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char dev_str[64];
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|
|
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dev_dbg(&pdev->xdev->dev, "Reconfiguring device ...\n");
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mutex_lock(&pdev->dev_lock);
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/* Make sure we only reconfigure once */
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if (xenbus_read_driver_state(pdev->xdev->nodename) !=
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XenbusStateReconfiguring)
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goto out;
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err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename, "num_devs", "%d",
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&num_devs);
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if (err != 1) {
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if (err >= 0)
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err = -EINVAL;
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xenbus_dev_fatal(pdev->xdev, err,
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"Error reading number of devices");
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goto out;
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|
}
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|
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for (i = 0; i < num_devs; i++) {
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len = snprintf(state_str, sizeof(state_str), "state-%d", i);
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if (unlikely(len >= (sizeof(state_str) - 1))) {
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err = -ENOMEM;
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xenbus_dev_fatal(pdev->xdev, err,
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"String overflow while reading "
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"configuration");
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goto out;
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}
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substate = xenbus_read_unsigned(pdev->xdev->nodename, state_str,
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XenbusStateUnknown);
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|
|
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switch (substate) {
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case XenbusStateInitialising:
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dev_dbg(&pdev->xdev->dev, "Attaching dev-%d ...\n", i);
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|
|
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len = snprintf(dev_str, sizeof(dev_str), "dev-%d", i);
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if (unlikely(len >= (sizeof(dev_str) - 1))) {
|
|
err = -ENOMEM;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
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"String overflow while "
|
|
"reading configuration");
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goto out;
|
|
}
|
|
err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename,
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dev_str, "%x:%x:%x.%x",
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&domain, &bus, &slot, &func);
|
|
if (err < 0) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error reading device "
|
|
"configuration");
|
|
goto out;
|
|
}
|
|
if (err != 4) {
|
|
err = -EINVAL;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error parsing pci device "
|
|
"configuration");
|
|
goto out;
|
|
}
|
|
|
|
err = xen_pcibk_export_device(pdev, domain, bus, slot,
|
|
func, i);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* Publish pci roots. */
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|
err = xen_pcibk_publish_pci_roots(pdev,
|
|
xen_pcibk_publish_pci_root);
|
|
if (err) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error while publish PCI root"
|
|
"buses for frontend");
|
|
goto out;
|
|
}
|
|
|
|
err = xenbus_printf(XBT_NIL, pdev->xdev->nodename,
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|
state_str, "%d",
|
|
XenbusStateInitialised);
|
|
if (err) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error switching substate of "
|
|
"dev-%d\n", i);
|
|
goto out;
|
|
}
|
|
break;
|
|
|
|
case XenbusStateClosing:
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|
dev_dbg(&pdev->xdev->dev, "Detaching dev-%d ...\n", i);
|
|
|
|
len = snprintf(dev_str, sizeof(dev_str), "vdev-%d", i);
|
|
if (unlikely(len >= (sizeof(dev_str) - 1))) {
|
|
err = -ENOMEM;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"String overflow while "
|
|
"reading configuration");
|
|
goto out;
|
|
}
|
|
err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename,
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|
dev_str, "%x:%x:%x.%x",
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|
&domain, &bus, &slot, &func);
|
|
if (err < 0) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error reading device "
|
|
"configuration");
|
|
goto out;
|
|
}
|
|
if (err != 4) {
|
|
err = -EINVAL;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error parsing pci device "
|
|
"configuration");
|
|
goto out;
|
|
}
|
|
|
|
err = xen_pcibk_remove_device(pdev, domain, bus, slot,
|
|
func);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* TODO: If at some point we implement support for pci
|
|
* root hot-remove on pcifront side, we'll need to
|
|
* remove unnecessary xenstore nodes of pci roots here.
|
|
*/
|
|
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
err = xenbus_switch_state(pdev->xdev, XenbusStateReconfigured);
|
|
if (err) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error switching to reconfigured state!");
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&pdev->dev_lock);
|
|
return 0;
|
|
}
|
|
|
|
static void xen_pcibk_frontend_changed(struct xenbus_device *xdev,
|
|
enum xenbus_state fe_state)
|
|
{
|
|
struct xen_pcibk_device *pdev = dev_get_drvdata(&xdev->dev);
|
|
|
|
dev_dbg(&xdev->dev, "fe state changed %d\n", fe_state);
|
|
|
|
switch (fe_state) {
|
|
case XenbusStateInitialised:
|
|
xen_pcibk_attach(pdev);
|
|
break;
|
|
|
|
case XenbusStateReconfiguring:
|
|
xen_pcibk_reconfigure(pdev);
|
|
break;
|
|
|
|
case XenbusStateConnected:
|
|
/* pcifront switched its state from reconfiguring to connected.
|
|
* Then switch to connected state.
|
|
*/
|
|
xenbus_switch_state(xdev, XenbusStateConnected);
|
|
break;
|
|
|
|
case XenbusStateClosing:
|
|
xen_pcibk_disconnect(pdev);
|
|
xenbus_switch_state(xdev, XenbusStateClosing);
|
|
break;
|
|
|
|
case XenbusStateClosed:
|
|
xen_pcibk_disconnect(pdev);
|
|
xenbus_switch_state(xdev, XenbusStateClosed);
|
|
if (xenbus_dev_is_online(xdev))
|
|
break;
|
|
/* fall through if not online */
|
|
case XenbusStateUnknown:
|
|
dev_dbg(&xdev->dev, "frontend is gone! unregister device\n");
|
|
device_unregister(&xdev->dev);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int xen_pcibk_setup_backend(struct xen_pcibk_device *pdev)
|
|
{
|
|
/* Get configuration from xend (if available now) */
|
|
int domain, bus, slot, func;
|
|
int err = 0;
|
|
int i, num_devs;
|
|
char dev_str[64];
|
|
char state_str[64];
|
|
|
|
mutex_lock(&pdev->dev_lock);
|
|
/* It's possible we could get the call to setup twice, so make sure
|
|
* we're not already connected.
|
|
*/
|
|
if (xenbus_read_driver_state(pdev->xdev->nodename) !=
|
|
XenbusStateInitWait)
|
|
goto out;
|
|
|
|
dev_dbg(&pdev->xdev->dev, "getting be setup\n");
|
|
|
|
err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename, "num_devs", "%d",
|
|
&num_devs);
|
|
if (err != 1) {
|
|
if (err >= 0)
|
|
err = -EINVAL;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error reading number of devices");
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < num_devs; i++) {
|
|
int l = snprintf(dev_str, sizeof(dev_str), "dev-%d", i);
|
|
if (unlikely(l >= (sizeof(dev_str) - 1))) {
|
|
err = -ENOMEM;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"String overflow while reading "
|
|
"configuration");
|
|
goto out;
|
|
}
|
|
|
|
err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename, dev_str,
|
|
"%x:%x:%x.%x", &domain, &bus, &slot, &func);
|
|
if (err < 0) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error reading device configuration");
|
|
goto out;
|
|
}
|
|
if (err != 4) {
|
|
err = -EINVAL;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error parsing pci device "
|
|
"configuration");
|
|
goto out;
|
|
}
|
|
|
|
err = xen_pcibk_export_device(pdev, domain, bus, slot, func, i);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* Switch substate of this device. */
|
|
l = snprintf(state_str, sizeof(state_str), "state-%d", i);
|
|
if (unlikely(l >= (sizeof(state_str) - 1))) {
|
|
err = -ENOMEM;
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"String overflow while reading "
|
|
"configuration");
|
|
goto out;
|
|
}
|
|
err = xenbus_printf(XBT_NIL, pdev->xdev->nodename, state_str,
|
|
"%d", XenbusStateInitialised);
|
|
if (err) {
|
|
xenbus_dev_fatal(pdev->xdev, err, "Error switching "
|
|
"substate of dev-%d\n", i);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
err = xen_pcibk_publish_pci_roots(pdev, xen_pcibk_publish_pci_root);
|
|
if (err) {
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error while publish PCI root buses "
|
|
"for frontend");
|
|
goto out;
|
|
}
|
|
|
|
err = xenbus_switch_state(pdev->xdev, XenbusStateInitialised);
|
|
if (err)
|
|
xenbus_dev_fatal(pdev->xdev, err,
|
|
"Error switching to initialised state!");
|
|
|
|
out:
|
|
mutex_unlock(&pdev->dev_lock);
|
|
if (!err)
|
|
/* see if pcifront is already configured (if not, we'll wait) */
|
|
xen_pcibk_attach(pdev);
|
|
return err;
|
|
}
|
|
|
|
static void xen_pcibk_be_watch(struct xenbus_watch *watch,
|
|
const char *path, const char *token)
|
|
{
|
|
struct xen_pcibk_device *pdev =
|
|
container_of(watch, struct xen_pcibk_device, be_watch);
|
|
|
|
switch (xenbus_read_driver_state(pdev->xdev->nodename)) {
|
|
case XenbusStateInitWait:
|
|
xen_pcibk_setup_backend(pdev);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int xen_pcibk_xenbus_probe(struct xenbus_device *dev,
|
|
const struct xenbus_device_id *id)
|
|
{
|
|
int err = 0;
|
|
struct xen_pcibk_device *pdev = alloc_pdev(dev);
|
|
|
|
if (pdev == NULL) {
|
|
err = -ENOMEM;
|
|
xenbus_dev_fatal(dev, err,
|
|
"Error allocating xen_pcibk_device struct");
|
|
goto out;
|
|
}
|
|
|
|
/* wait for xend to configure us */
|
|
err = xenbus_switch_state(dev, XenbusStateInitWait);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* watch the backend node for backend configuration information */
|
|
err = xenbus_watch_path(dev, dev->nodename, &pdev->be_watch,
|
|
xen_pcibk_be_watch);
|
|
if (err)
|
|
goto out;
|
|
|
|
pdev->be_watching = 1;
|
|
|
|
/* We need to force a call to our callback here in case
|
|
* xend already configured us!
|
|
*/
|
|
xen_pcibk_be_watch(&pdev->be_watch, NULL, 0);
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int xen_pcibk_xenbus_remove(struct xenbus_device *dev)
|
|
{
|
|
struct xen_pcibk_device *pdev = dev_get_drvdata(&dev->dev);
|
|
|
|
if (pdev != NULL)
|
|
free_pdev(pdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct xenbus_device_id xen_pcibk_ids[] = {
|
|
{"pci"},
|
|
{""},
|
|
};
|
|
|
|
static struct xenbus_driver xen_pcibk_driver = {
|
|
.name = DRV_NAME,
|
|
.ids = xen_pcibk_ids,
|
|
.probe = xen_pcibk_xenbus_probe,
|
|
.remove = xen_pcibk_xenbus_remove,
|
|
.otherend_changed = xen_pcibk_frontend_changed,
|
|
};
|
|
|
|
const struct xen_pcibk_backend *__read_mostly xen_pcibk_backend;
|
|
|
|
int __init xen_pcibk_xenbus_register(void)
|
|
{
|
|
xen_pcibk_backend = &xen_pcibk_vpci_backend;
|
|
if (passthrough)
|
|
xen_pcibk_backend = &xen_pcibk_passthrough_backend;
|
|
pr_info("backend is %s\n", xen_pcibk_backend->name);
|
|
return xenbus_register_backend(&xen_pcibk_driver);
|
|
}
|
|
|
|
void __exit xen_pcibk_xenbus_unregister(void)
|
|
{
|
|
xenbus_unregister_driver(&xen_pcibk_driver);
|
|
}
|