Re: [PATCH v3 0/2] iommu: handle drivers that manage iommu directly

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On 06/09/2019 22:44, Rob Clark wrote:
From: Rob Clark <robdclark@xxxxxxxxxxxx>

One of the challenges we have to enable the aarch64 laptops upstream
is dealing with the fact that the bootloader enables the display and
takes the corresponding SMMU context-bank out of BYPASS.  Unfortunately,
currently, the IOMMU framework attaches a DMA (or potentially an
IDENTITY) domain before the driver is probed and has a chance to
intervene and shutdown scanout.  Which makes things go horribly wrong.

Nope, things already went horribly wrong in arm_smmu_device_reset() - sure, sometimes for some configurations it might *seem* like they didn't and that you can fudge the context bank state at arm's length from core code later, but the truth is that impl->cfg_probe is your last chance to guarantee that any necessary SMMU state is preserved.

The remainder of the problem involves reworking default domain allocation such that we can converge on what iommu_request_dm_for_dev() currently does but without the momentary attachment to a translation domain to cause hiccups. That's starting here:

https://lore.kernel.org/linux-iommu/cover.1566353521.git.sai.praneeth.prakhya@xxxxxxxxx/

But in this case, drm/msm is already directly managing it's IOMMUs
directly, the DMA API attached iommu_domain simply gets in the way.
This series adds a way that a driver can indicate to drivers/iommu
that it does not wish to have an DMA managed iommu_domain attached.
This way, drm/msm can shut down scanout cleanly before attaching it's
own iommu_domain.

NOTE that to get things working with arm-smmu on the aarch64 laptops,
you also need a patchset[1] from Bjorn Andersson to inherit SMMU config
at boot, when it is already enabled.

[1] https://www.spinics.net/lists/arm-kernel/msg732246.html

NOTE that in discussion of previous revisions, RMRR came up.  This is
not really a replacement for RMRR (nor does RMRR really provide any
more information than we already get from EFI GOP, or DT in the
simplefb case).  I also don't see how RMRR could help w/ SMMU handover
of CB/SMR config (Bjorn's patchset[1]) without defining new tables.

The point of RMRR-like-things is that they identify not just the memory region but also the specific device accessing them, which means the IOMMU driver knows up-front which IDs etc. it must be careful not to disrupt. Obviously for SMMU that *would* be some new table (designed to encompass everything relevant) since literal RMRRs are specifically an Intel VT-d thing.

This perhaps doesn't solve the more general case of bootloader enabled
display for drivers that actually want to use DMA API managed IOMMU.
But it does also happen to avoid a related problem with GPU, caused by
the DMA domain claiming the context bank that the GPU firmware expects
to use.

Careful bringing that up again, or I really will rework the context bank allocator to avoid this default domain problem entirely... ;)

Robin.

 And it avoids spurious TLB invalidation coming from the unused
DMA domain.  So IMHO this is a useful and necessary change.

Rob Clark (2):
   iommu: add support for drivers that manage iommu explicitly
   drm/msm: mark devices where iommu is managed by driver

  drivers/gpu/drm/msm/adreno/adreno_device.c | 1 +
  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c    | 1 +
  drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c   | 1 +
  drivers/gpu/drm/msm/msm_drv.c              | 1 +
  drivers/iommu/iommu.c                      | 2 +-
  drivers/iommu/of_iommu.c                   | 3 +++
  include/linux/device.h                     | 3 ++-
  7 files changed, 10 insertions(+), 2 deletions(-)

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