On Mon, 2 Dec 2024 18:34:25 -0800, Jakub Kicinski <kuba@xxxxxxxxxx> wrote: > On Tue, 3 Dec 2024 10:03:31 +0800 Furong Xu wrote: > > I requested Jon to provide more info about "Tx DMA map failed" in previous > > reply, and he does not respond yet. > > What does it mean to provide "more info" about a print statement from > the driver? Is there a Kconfig which he needs to set to get more info? > Perhaps you should provide a debug patch he can apply on his tree, that > will print info about (1) which buffer mapping failed (head or frags); > (2) what the physical address was of the buffer that couldn't be mapped. A debug patch to print info about buffer makes no sense here. Both Tegra186 Jetson TX2(tegra186-p2771-0000) and Tegra194 Jetson AGX Xavier (tegra194-p2972-0000) enable IOMMU/SMMU for stmmac in its device-tree node, buffer info should be investigated with detailed IOMMU/SMMU debug info from drivers/iommu/arm/arm-smmu/arm-smmu-nvidia.c together. I am not an expert in IOMMU, so I cannot help more. Without the help from Jon, our only choice is revert as you said. Thanks.
