On Thu, Jul 04, 2024 at 10:00:52AM +0800, Icenowy Zheng wrote: > So I here want to ask a question as an individual hacker: what's the > policy of linux-pci towards these non-coherent PCIe implementations? > > If the sentences of Christian is right, these implementations are just > out-of-spec, should them get purged out of the kernel, or at least > raising a warning that some HW won't work because of inconformant > implementation? Nothing in the PCIe specifications that mandates a programming model. Non-coherent DMA is extremely common in lower end devices, and despite all the issues that it causes well supported in Linux. What are you trying to solve?
