diff options
Diffstat (limited to 'drivers/xen/dbgp.c')
| -rw-r--r-- | drivers/xen/dbgp.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/drivers/xen/dbgp.c b/drivers/xen/dbgp.c new file mode 100644 index 0000000000..cfb5de31d8 --- /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 |