On Wed, Oct 09, 2024 at 06:17:15PM GMT, Johan Hovold wrote: > The DWC PCIe controller can be used with its internal MSI controller or > with an external one such as the GICv3 Interrupt Translation Service > (ITS). > > Add the msi-map properties needed to use the GIC ITS. This will also > make Linux switch to the ITS implementation, which allows for assigning > affinity to individual MSIs. This specifically allows NVMe and Wi-Fi > interrupts to be processed on all cores (and not just on CPU0). > > Note that using the GIC ITS on x1e80100 will cause Advanced Error > Reporting (AER) interrupts to be received on errors unlike when using > the internal MSI controller. Consequently, notifications about > (correctable) errors may now be logged for errors that previously went > unnoticed. > > Also note that PCIe5 (and PCIe3) can currently only be used with the > internal MSI controller due to a platform (firmware) limitation. > > Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx> > --- > > The PCIe Gen4 stability fixes [1] are now in 6.12-rc1 so that we can enable > the GIC ITS without being flooded with link error notifications [2]. Cc: <stable+noautosel@xxxxxxxxxx> # Depends on driver stability fixes Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> > Johan > > [1] https://lore.kernel.org/lkml/20240911-pci-qcom-gen4-stability-v7-0-743f5c1fd027@xxxxxxxxxx/ > [2] https://lore.kernel.org/lkml/ZpDnSL8as7km9_0b@xxxxxxxxxxxxxxxxxxxx/ > > Changes in v2 > - amend commit message with comment about PCIe3 and PCIe5 only > supporting the internal MSI controller > > -- With best wishes Dmitry
