tree 502765d9cc5f64412e3322976f223e9e1a93cd84
parent 1844aacc837bf81cb1959fa65f2e52dcc70a0cae
author Michael Brown <mcb30@ipxe.org> 1636732671 +0000
committer Michael Brown <mcb30@ipxe.org> 1636732671 +0000

[xhci] Avoid DMA during shutdown if firmware has disabled bus mastering

On some systems (observed with the Thunderbolt ports on a ThinkPad X1
Extreme Gen3 and a ThinkPad P53), the system firmware will disable bus
mastering on the xHCI controller and all PCI bridges at the point that
ExitBootServices() is called if the IOMMU is enabled.  This leaves the
xHCI controller unable to shut down cleanly since all commands will
fail with a timeout.

Commit 85eb961 ("[xhci] Allow for permanent failure of the command
mechanism") allows us to detect that this has happened and respond
cleanly.  However, some unidentified hardware component (either the
xHCI controller or one of the PCI bridges) seems to manage to enqueue
the attempted DMA operation and eventually complete it after the
operating system kernel has reenabled bus mastering.  This results in
a DMA operation to an area of memory that the hardware is no longer
permitted to access.  On Windows with the Driver Verifier enabled,
this will result in a STOP 0xE6 (DRIVER_VERIFIER_DMA_VIOLATION).

Work around this problem by detecting when bus mastering has been
disabled, and immediately failing the device to avoid initiating any
further DMA attempts.

Signed-off-by: Michael Brown <mcb30@ipxe.org>