[v4,0/3] iommu/arm-smmu-qcom: Support maintaining bootloader mappings

Message

Bjorn Andersson Oct. 17, 2020, 4:39 a.m. UTC

This is the fourth attempt of inheriting the stream mapping for the framebuffer
on many Qualcomm platforms, in order to not hit catastrophic faults during
arm-smmu initialization.

The new approach does, based on Robin's suggestion, take a much more direct
approach with the allocation of a context bank for bypass emulation and use of
this context bank pretty much isolated to the Qualcomm specific implementation.

As before the patchset has been tested to boot DB845c (with splash screen) and
Lenovo Yoga C630 (with EFI framebuffer).

Bjorn Andersson (3):
  iommu/arm-smmu: Allow implementation specific write_s2cr
  iommu/arm-smmu-qcom: Read back stream mappings
  iommu/arm-smmu-qcom: Implement S2CR quirk

 drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 92 ++++++++++++++++++++++
 drivers/iommu/arm/arm-smmu/arm-smmu.c      | 22 ++++--
 drivers/iommu/arm/arm-smmu/arm-smmu.h      |  1 +
 3 files changed, 107 insertions(+), 8 deletions(-)