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-rw-r--r--drivers/xen/dbgp.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/drivers/xen/dbgp.c b/drivers/xen/dbgp.c
new file mode 100644
index 000000000..cfb5de31d
--- /dev/null
+++ b/drivers/xen/dbgp.c
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include <linux/pci.h>
+#include <linux/usb.h>
+#include <linux/usb/ehci_def.h>
+#include <linux/usb/hcd.h>
+#include <asm/xen/hypercall.h>
+#include <xen/interface/physdev.h>
+#include <xen/xen.h>
+
+static int xen_dbgp_op(struct usb_hcd *hcd, int op)
+{
+#ifdef CONFIG_PCI
+ const struct device *ctrlr = hcd_to_bus(hcd)->controller;
+#endif
+ struct physdev_dbgp_op dbgp;
+
+ if (!xen_initial_domain())
+ return 0;
+
+ dbgp.op = op;
+
+#ifdef CONFIG_PCI
+ if (dev_is_pci(ctrlr)) {
+ const struct pci_dev *pdev = to_pci_dev(ctrlr);
+
+ dbgp.u.pci.seg = pci_domain_nr(pdev->bus);
+ dbgp.u.pci.bus = pdev->bus->number;
+ dbgp.u.pci.devfn = pdev->devfn;
+ dbgp.bus = PHYSDEVOP_DBGP_BUS_PCI;
+ } else
+#endif
+ dbgp.bus = PHYSDEVOP_DBGP_BUS_UNKNOWN;
+
+ return HYPERVISOR_physdev_op(PHYSDEVOP_dbgp_op, &dbgp);
+}
+
+int xen_dbgp_reset_prep(struct usb_hcd *hcd)
+{
+ return xen_dbgp_op(hcd, PHYSDEVOP_DBGP_RESET_PREPARE);
+}
+
+int xen_dbgp_external_startup(struct usb_hcd *hcd)
+{
+ return xen_dbgp_op(hcd, PHYSDEVOP_DBGP_RESET_DONE);
+}
+
+#ifndef CONFIG_EARLY_PRINTK_DBGP
+#include <linux/export.h>
+EXPORT_SYMBOL_GPL(xen_dbgp_reset_prep);
+EXPORT_SYMBOL_GPL(xen_dbgp_external_startup);
+#endif