linux/drivers/xen/dbgp.c
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   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
   9static 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
  36int xen_dbgp_reset_prep(struct usb_hcd *hcd)
  37{
  38        return xen_dbgp_op(hcd, PHYSDEVOP_DBGP_RESET_PREPARE);
  39}
  40
  41int 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>
  48EXPORT_SYMBOL_GPL(xen_dbgp_reset_prep);
  49EXPORT_SYMBOL_GPL(xen_dbgp_external_startup);
  50#endif
  51
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