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Michael Brown 85eb961bf9 [xhci] Allow for permanent failure of the command mechanism 
Some xHCI controllers (observed with the Thunderbolt ports on a
ThinkPad X1 Extreme Gen3 and a ThinkPad P53) seem to suffer a
catastrophic failure at the point that ExitBootServices() is called if
the IOMMU is enabled.  The symptoms appear to be consistent with
another UEFI driver (e.g. the IOMMU driver, or the Thunderbolt driver)
having torn down the DMA mappings, leaving the xHCI controller unable
to write to host memory.  The observable effect is that all commands
fail with a timeout, and attempts to abort command execution similarly
fail since the xHCI controller is unable to report the abort
completion.

Check for failure to abort a command, and respond by performing a full
device reset (as recommended by the xHCI specification) and by marking
the device as permanently failed.

Reported-by: Andreas Hammarskjöld <junior@2PintSoftware.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
 		2021-10-28 23:18:07 +01:00
.github/workflows [linux] Use host glibc system call wrappers 2021-02-28 23:28:23 +00:00
contrib [cloud] Allow multiple images to be imported simultaneously 2021-05-02 12:38:03 +01:00
src [xhci] Allow for permanent failure of the command mechanism 2021-10-28 23:18:07 +01:00
COPYING [legal] Update GPLv2 licence text 2015-02-26 17:59:53 +00:00
COPYING.GPLv2 [legal] Update GPLv2 licence text 2015-02-26 17:59:53 +00:00
COPYING.UBDL [legal] Add support for the Unmodified Binary Distribution Licence 2015-03-02 12:07:14 +00:00
README [doc] Re-add README file 2010-05-28 00:03:47 +01:00

README 

iPXE README File

Quick start guide:

   cd src
   make

For any more detailed instructions, see http://ipxe.org