On Mon, Nov 04, 2024 at 02:22:58PM -0500, Frank Li wrote: Any comments for this patches? Bjorn and give ack at v4 and Marc Zyngier give test/review tag at v4. I just drop these because change to use helper function and funtionality is the same. After this patch merge, I think apply's bus notification can convert to this way. Frank > Some system's IOMMU stream(master) ID bits(such as 6bits) less than > pci_device_id (16bit). It needs add hardware configuration to enable > pci_device_id to stream ID convert. > > https://lore.kernel.org/imx/20240622173849.GA1432357@bhelgaas/ > This ways use pcie bus notifier (like apple pci controller), when new PCIe > device added, bus notifier will call register specific callback to handle > look up table (LUT) configuration. > > https://lore.kernel.org/imx/20240429150842.GC1709920-robh@xxxxxxxxxx/ > which parse dt's 'msi-map' and 'iommu-map' property to static config LUT > table (qcom use this way). This way is rejected by DT maintainer Rob. > > Above ways can resolve LUT take or stream id out of usage the problem. If > there are not enough stream id resource, not error return, EP hardware > still issue DMA to do transfer, which may transfer to wrong possition. > > Add enable(disable)_device() hook for bridge can return error when not > enough resource, and PCI device can't enabled. > > Basicallly this version can match Bjorn's requirement: > 1: simple, because it is rare that there are no LUT resource. > 2: EP driver probe failure when no LUT, but lspci can see such device. > > [ 2.164415] nvme nvme0: pci function 0000:01:00.0 > [ 2.169142] pci 0000:00:00.0: Error enabling bridge (-1), continuing > [ 2.175654] nvme 0000:01:00.0: probe with driver nvme failed with error -12 > > > lspci > 0000:00:00.0 PCI bridge: Philips Semiconductors Device 0000 > 0000:01:00.0 Non-Volatile memory controller: Micron Technology Inc 2100AI NVMe SSD [Nitro] (rev 03) > > To: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> > To: Richard Zhu <hongxing.zhu@xxxxxxx> > To: Lucas Stach <l.stach@xxxxxxxxxxxxxx> > To: Lorenzo Pieralisi <lpieralisi@xxxxxxxxxx> > To: Krzysztof Wilczyński <kw@xxxxxxxxx> > To: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> > To: Rob Herring <robh@xxxxxxxxxx> > To: Shawn Guo <shawnguo@xxxxxxxxxx> > To: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx> > To: Pengutronix Kernel Team <kernel@xxxxxxxxxxxxxx> > To: Fabio Estevam <festevam@xxxxxxxxx> > Cc: linux-pci@xxxxxxxxxxxxxxx > Cc: linux-kernel@xxxxxxxxxxxxxxx > Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > Cc: imx@xxxxxxxxxxxxxxx > Cc: Frank.li@xxxxxxx \ > Cc: alyssa@xxxxxxxxxxxxx \ > Cc: bpf@xxxxxxxxxxxxxxx \ > Cc: broonie@xxxxxxxxxx \ > Cc: jgg@xxxxxxxx \ > Cc: joro@xxxxxxxxxx \ > Cc: l.stach@xxxxxxxxxxxxxx \ > Cc: lgirdwood@xxxxxxxxx \ > Cc: maz@xxxxxxxxxx \ > Cc: p.zabel@xxxxxxxxxxxxxx \ > Cc: robin.murphy@xxxxxxx \ > Cc: will@xxxxxxxxxx \ > Cc: Robin Murphy <robin.murphy@xxxxxxx> > Cc: Marc Zyngier <maz@xxxxxxxxxx> > > Signed-off-by: Frank Li <Frank.Li@xxxxxxx> > --- > Changes in v5: > - Add help function of pci_bridge_enable(disable)_device > - Because big change, removed Bjorn's review tags and have not > added > Marc Zyngier't review and test tags > - Fix pci-imx6.c according to Mani's feedback > - Link to v4: https://lore.kernel.org/r/20241101-imx95_lut-v4-0-0fdf9a2fe754@xxxxxxx > > Changes in v4: > - Add Bjorn Helgaas review tag for patch1 > - check 'target' value for patch2 > - detail see each patches > - Link to v3: https://lore.kernel.org/r/20241024-imx95_lut-v3-0-7509c9bbab86@xxxxxxx > > Changes in v3: > - disable_device when error happen > - use target for of_map_id > - Check if rid already in lut table when enable deviced > - Link to v2: https://lore.kernel.org/r/20240930-imx95_lut-v2-0-3b6467ba539a@xxxxxxx > > Changes in v2: > - see each patch > - Link to v1: https://lore.kernel.org/r/20240926-imx95_lut-v1-0-d0c62087dbab@xxxxxxx > > --- > Frank Li (2): > PCI: Add enable_device() and disable_device() callbacks for bridges > PCI: imx6: Add IOMMU and ITS MSI support for i.MX95 > > drivers/pci/controller/dwc/pci-imx6.c | 176 +++++++++++++++++++++++++++++++++- > drivers/pci/pci.c | 36 ++++++- > include/linux/pci.h | 2 + > 3 files changed, 212 insertions(+), 2 deletions(-) > --- > base-commit: 06fb071a1aefbe4c6cc8fd41aacd0b9422361721 > change-id: 20240926-imx95_lut-1c68222e0944 > > Best regards, > --- > Frank Li <Frank.Li@xxxxxxx> >
