(swiotlb) for 4.10

Hey Linus,

Please git pull the following branch:

git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb.git stable/for-linus-4.10

It has one fix to make i915 work when using Xen SWIOTLB, and a feature from Geert to aid in debugging of devices that can't do DMA outside the 32-bit address space.

The feature from Geert is on top of v4.10 merge window commit (specifically you pulling my previous branch), as his changes were dependent on the Documentation/ movement patches.

I figured it would just easier than me trying than to cherry-pick the Documentation patches to satisfy git.

The patches have been soaking since 12/20, albeit I updated the last patch due to linux-next catching an compiler error and adding an Tested-and-Reported-by tag.

Thanks!

 Documentation/admin-guide/kernel-parameters.txt |  3 +-
 arch/arm64/mm/dma-mapping.c                     |  3 +-
 arch/arm64/mm/init.c                            |  3 +-
 arch/x86/kernel/pci-swiotlb.c                   |  6 +--
 arch/x86/xen/pci-swiotlb-xen.c                  |  2 +-
 drivers/gpu/drm/i915/i915_gem.c                 | 11 +-----
 drivers/xen/swiotlb-xen.c                       |  8 +++-
 include/linux/swiotlb.h                         | 11 +++++-
 include/trace/events/swiotlb.h                  | 17 ++++----
 lib/swiotlb.c                                   | 52 ++++++++++++++++++++++---
 10 files changed, 82 insertions(+), 34 deletions(-)

Geert Uytterhoeven (3):
x86, swiotlb: Simplify pci_swiotlb_detect_override()
swiotlb: Convert swiotlb_force from int to enum
swiotlb: Add swiotlb=noforce debug option

Konrad Rzeszutek Wilk (1):
swiotlb: Export swiotlb_max_segment to users