[0/3] Support xen-driven USB3 debug capability

Message

Connor Davis May 12, 2021, 12:18 a.m. UTC

Hi all,

This goal of this series is to allow the USB3 debug capability (DbC) to be
safely used by xen while linux runs as dom0. The first patch prevents
the early DbC driver from using an already-running DbC. The second
exports xen_dbgp_reset_prep and xen_dbgp_external_startup functions when
CONFIG_XEN_DOM0 is enabled so they may be used by the xHCI driver.
The last uses those functions to notify xen of unsafe periods (e.g. reset
and D3hot transition).

Thanks,
Connor

--
Connor Davis (3):
  usb: early: Avoid using DbC if already enabled
  xen: Export dbgp functions when CONFIG_XEN_DOM0 is enabled
  usb: xhci: Notify xen when DbC is unsafe to use

 drivers/usb/early/xhci-dbc.c   | 10 ++++++
 drivers/usb/host/xhci-dbgcap.h |  6 ++++
 drivers/usb/host/xhci.c        | 57 ++++++++++++++++++++++++++++++++++
 drivers/usb/host/xhci.h        |  1 +
 drivers/xen/dbgp.c             |  2 +-
 5 files changed, 75 insertions(+), 1 deletion(-)


base-commit: 88b06399c9c766c283e070b022b5ceafa4f63f19
--
2.31.1