cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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dbgp.c (1193B)

      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