[PATCH v2 00/10] Multi-segment Event Ring support for XHCI

[Lukas Wunner <lukas@wunner.de>]

Enlarge the XHCI Event Ring to cope with high load situations
by allowing more than one segment.

This second iteration seeks to address all of Mathias' review feedback on v1:

* Patch [01/10]:
  Use ERST_DESI_MASK instead of ERST_PTR_MASK when constructing the new
  ERDP value to avoid carrying over a set EHB bit.

* Patch [04/10]:
  Only use up to 2 Event Ring segments by default (instead of 8).

* Patch [05/10]:
  New patch to adjust segment numbers after ring expansion.

* Patch [08/10]:
  New patch to clean up ERST_PTR_MASK inversion.

Several other issues caught my eye and I'm including fixes and cleanups
for those as well.

Link to v1:
https://lore.kernel.org/all/cover.1692085657.git.lukas@wunner.de/


Jonathan Bell (1):
  xhci: Use more than one Event Ring segment

Lukas Wunner (9):
  xhci: Clear EHB bit only at end of interrupt handler
  xhci: Preserve RsvdP bits in ERSTBA register correctly
  xhci: Set DESI bits in ERDP register correctly
  xhci: Adjust segment numbers after ring expansion
  xhci: Update last segment pointer after Event Ring expansion
  xhci: Expose segment numbers in debugfs
  xhci: Clean up ERST_PTR_MASK inversion
  xhci: Clean up stale comment on ERST_SIZE macro
  xhci: Clean up xhci_{alloc,free}_erst() declarations

 drivers/usb/host/xhci-debugfs.c |  2 +-
 drivers/usb/host/xhci-mem.c     | 68 ++++++++++++++++++---------------
 drivers/usb/host/xhci-ring.c    | 17 +++++----
 drivers/usb/host/xhci.c         |  2 +-
 drivers/usb/host/xhci.h         | 18 +++------
 5 files changed, 53 insertions(+), 54 deletions(-)

-- 
2.39.2