On Thu, May 26, 2022 at 09:44:03AM +0530, Sai Prakash Ranjan wrote: > TLB sync timeouts can be due to various reasons such as TBU power down > or pending TCU/TBU invalidation/sync and so on. Debugging these often > require dumping of some implementation defined registers to know the > status of TBU/TCU operations and some of these registers are not > accessible in non-secure world such as from kernel and requires SMC > calls to read them in the secure world. So, add this debug support > to dump implementation defined registers for TLB sync timeout issues. > > Signed-off-by: Sai Prakash Ranjan <quic_saipraka@xxxxxxxxxxx> > --- > > Changes in v2: > * Use scm call consistently so that it works on older chipsets where > some of these regs are secure registers. > * Add device specific data to get the implementation defined register > offsets. > > --- > drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 161 ++++++++++++++++++--- > drivers/iommu/arm/arm-smmu/arm-smmu.c | 2 + > drivers/iommu/arm/arm-smmu/arm-smmu.h | 1 + > 3 files changed, 146 insertions(+), 18 deletions(-) If this is useful to you, then I suppose it's something we could support, however I'm pretty worried about our ability to maintain/scale this stuff as it is extended to support additional SoCs and other custom debugging features. Perhaps you could stick it all in arm-smmu-qcom-debug.c and have a new config option for that, so at least it's even further out of the way? Will
