On Thu, Apr 10, 2025 at 03:50:27PM -0700, Shyam Saini wrote: > > Hi, > > Currently, the MSI_IOVA_BASE address is hard-coded to 0x80000000, > assuming that all platforms have this address available for MSI IOVA > reservation. However, this is not always the case, as some platforms > reserve this address for other purposes. Consequently, these platforms > cannot reserve the MSI_IOVA_BASE address for MSI. > > There was an [1] attempt to fix this problem by passing the MSI IOVA > base as a kernel command line parameter. > > This patch series aims to address the issue by introducing a new DTS > property, "arm,smmu-faulty-msi-iova" which can be used to hold faulty > MSI IOVA address. This property can be passed to ARM SMMU drivers > via device tree so that the drivers can select appropriate MSI IOVA base > address which doesn't intersect with the faulty MSI IOVA address.
I thought we already talked about this and you were not going to be doing a DT proposal for a software knob? And then you didn't even link to the recent discussion :( https://lore.kernel.org/linux-iommu/20250403232619.ga681...@ziepe.ca/ It is easily solved in the smmuv3 driver without out any DT. Please do that. Jason
