drivers/xen/dbgp.c

   1 #include <linux/pci.h>
   2 #include <linux/usb.h>
   3 #include <linux/usb/ehci_def.h>
   4 #include <linux/usb/hcd.h>
   5 #include <asm/xen/hypercall.h>
   6 #include <xen/interface/physdev.h>
   7 #include <xen/xen.h>
   8
   9 static int xen_dbgp_op(struct usb_hcd *hcd, int op)
  10 {
  11 #ifdef CONFIG_PCI
  12         const struct device *ctrlr = hcd_to_bus(hcd)->controller;
  13 #endif
  14         struct physdev_dbgp_op dbgp;
  15
  16         if (!xen_initial_domain())
  17                 return 0;
  18
  19         dbgp.op = op;
  20
  21 #ifdef CONFIG_PCI
  22         if (ctrlr->bus == &pci_bus_type) {
  23                 const struct pci_dev *pdev = to_pci_dev(ctrlr);
  24
  25                 dbgp.u.pci.seg = pci_domain_nr(pdev->bus);
  26                 dbgp.u.pci.bus = pdev->bus->number;
  27                 dbgp.u.pci.devfn = pdev->devfn;
  28                 dbgp.bus = PHYSDEVOP_DBGP_BUS_PCI;
  29         } else
  30 #endif
  31                 dbgp.bus = PHYSDEVOP_DBGP_BUS_UNKNOWN;
  32
  33         return HYPERVISOR_physdev_op(PHYSDEVOP_dbgp_op, &dbgp);
  34 }
  35
  36 int xen_dbgp_reset_prep(struct usb_hcd *hcd)
  37 {
  38         return xen_dbgp_op(hcd, PHYSDEVOP_DBGP_RESET_PREPARE);
  39 }
  40
  41 int xen_dbgp_external_startup(struct usb_hcd *hcd)
  42 {
  43         return xen_dbgp_op(hcd, PHYSDEVOP_DBGP_RESET_DONE);
  44 }
  45
  46 #ifndef CONFIG_EARLY_PRINTK_DBGP
  47 #include <linux/export.h>
  48 EXPORT_SYMBOL_GPL(xen_dbgp_reset_prep);
  49 EXPORT_SYMBOL_GPL(xen_dbgp_external_startup);
  50 #endif