HiSilicon KunPeng920 and KunPeng930 have devices appear as PCI but are actually on the AMBA bus. These fake PCI devices have PASID capability though not supporting TLP.
Add a quirk to set pasid_no_tlp and dma-can-stall for these devices. v3: Rebase to Linux 5.12-rc1 Change commit msg adding: Property dma-can-stall depends on patchset https://lore.kernel.org/linux-iommu/20210302092644.2553014-1-jean-phili...@linaro.org/ By the way the patchset can directly applied on 5.12-rc1 and build successfully though without the dependent patchset. v2: Add a new pci_dev bit: pasid_no_tlp, suggested by Bjorn "Apparently these devices have a PASID capability. I think you should add a new pci_dev bit that is specific to this idea of "PASID works without TLP prefixes" and then change pci_enable_pasid() to look at that bit as well as eetlp_prefix_path." https://lore.kernel.org/linux-pci/20210112170230.GA1838341@bjorn-Precision-5520/ Zhangfei Gao (3): PCI: PASID can be enabled without TLP prefix PCI: Add a quirk to set pasid_no_tlp for HiSilicon chips PCI: Set dma-can-stall for HiSilicon chips drivers/pci/ats.c | 2 +- drivers/pci/quirks.c | 27 +++++++++++++++++++++++++++ include/linux/pci.h | 1 + 3 files changed, 29 insertions(+), 1 deletion(-) -- 2.9.5
