LXR linux/drivers/xen/dbgp.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2#include <linux/pci.h>
   3#include <linux/usb.h>
   4#include <linux/usb/ehci_def.h>
   5#include <linux/usb/hcd.h>
   6#include <asm/xen/hypercall.h>
   7#include <xen/interface/physdev.h>
   8#include <xen/xen.h>
   9
  10static int xen_dbgp_op(struct usb_hcd *hcd, int op)
  11{
  12#ifdef CONFIG_PCI
  13        const struct device *ctrlr = hcd_to_bus(hcd)->controller;
  14#endif
  15        struct physdev_dbgp_op dbgp;
  16
  17        if (!xen_initial_domain())
  18                return 0;
  19
  20        dbgp.op = op;
  21
  22#ifdef CONFIG_PCI
  23        if (dev_is_pci(ctrlr)) {
  24                const struct pci_dev *pdev = to_pci_dev(ctrlr);
  25
  26                dbgp.u.pci.seg = pci_domain_nr(pdev->bus);
  27                dbgp.u.pci.bus = pdev->bus->number;
  28                dbgp.u.pci.devfn = pdev->devfn;
  29                dbgp.bus = PHYSDEVOP_DBGP_BUS_PCI;
  30        } else
  31#endif
  32                dbgp.bus = PHYSDEVOP_DBGP_BUS_UNKNOWN;
  33
  34        return HYPERVISOR_physdev_op(PHYSDEVOP_dbgp_op, &dbgp);
  35}
  36
  37int xen_dbgp_reset_prep(struct usb_hcd *hcd)
  38{
  39        return xen_dbgp_op(hcd, PHYSDEVOP_DBGP_RESET_PREPARE);
  40}
  41
  42int xen_dbgp_external_startup(struct usb_hcd *hcd)
  43{
  44        return xen_dbgp_op(hcd, PHYSDEVOP_DBGP_RESET_DONE);
  45}
  46
  47#ifndef CONFIG_EARLY_PRINTK_DBGP
  48#include <linux/export.h>
  49EXPORT_SYMBOL_GPL(xen_dbgp_reset_prep);
  50EXPORT_SYMBOL_GPL(xen_dbgp_external_startup);
  51#endif
  52