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
  10 static 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
  37 int xen_dbgp_reset_prep(struct usb_hcd *hcd)
  38 {
  39         return xen_dbgp_op(hcd, PHYSDEVOP_DBGP_RESET_PREPARE);
  40 }
  41
  42 int 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>
  49 EXPORT_SYMBOL_GPL(xen_dbgp_reset_prep);
  50 EXPORT_SYMBOL_GPL(xen_dbgp_external_startup);
  51 #endif