[Bug 2088458] Re: noble/jammy arm-smmu and firmware discrepancy

** Description changed:

For some of the arm64 systems arm-smmu driver doesn't seem to work with
older versions of the firmware where it encounters "mmu-masters" in the
device-tree.

In this case, kernel is unable to map simple drm device and fail to boot
- (Note that for "DMA_API" it works fine). See, drivers/iommu/arm/arm-
- smmu/arm-smmu.c:arm_smmu_device_dt_probe() for more information.
+ (Note that for "DMA_API" it works fine, only fails for "SMMU"). See,
+ drivers/iommu/arm/arm-smmu/arm-smmu.c:arm_smmu_device_dt_probe() for
+ more information.

I have seen the error for the following arm64 instances in testflinger:
moigno, igor, egede. Updating the firmware seems like one of the
possible solutions. But will bionic be able to boot afterwards?

I have seen this error in 6.8 kernels (noble+jammy). However, both
series should fail regardless of the kernel version.

Focal can be different since "CONFIG_ARM_SMMU_LEGACY_DT_BINDINGS" config
option is not defined there. If Focal works, we can remove this config
option from Jammy and Noble.

See error messages below for more information.

** Summary changed:

- noble/jammy arm-smmu and firmware discrepancy
+ noble/oracular arm-smmu and firmware discrepancy

** Summary changed:

- noble/oracular arm-smmu and firmware discrepancy
+ noble/jammy arm-smmu and firmware discrepancy

--
You received this bug notification because you are subscribed to linux
in Ubuntu.
Matching subscriptions: Bgg, Bmail, Nb
https://bugs.launchpad.net/bugs/2088458

Title:
noble/jammy arm-smmu and firmware discrepancy

Status in linux package in Ubuntu:
In Progress
Status in linux source package in Jammy:
New
Status in linux source package in Noble:
New

Bug description:
For some of the arm64 systems arm-smmu driver doesn't seem to work
with older versions of the firmware where it encounters "mmu-masters"
in the device-tree.

In this case, kernel is unable to map simple drm device and fail to
boot (Note that for "DMA_API" it works fine, only fails for "SMMU").
See, drivers/iommu/arm/arm-smmu/arm-smmu.c:arm_smmu_device_dt_probe()
for more information.

I have seen the error for the following arm64 instances in
testflinger: moigno, igor, egede. Updating the firmware seems like one
of the possible solutions. But will bionic be able to boot afterwards?

I have seen this error in 6.8 kernels (noble+jammy). However, both
series should fail regardless of the kernel version.

Focal can be different since "CONFIG_ARM_SMMU_LEGACY_DT_BINDINGS"
config option is not defined there. If Focal works, we can remove this
config option from Jammy and Noble.

See error messages below for more information.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2088458/+subscriptions