Terry Bowman wrote: > The AER service driver supports handling Downstream Port Protocol Errors in > Restricted CXL host (RCH) mode also known as CXL1.1. It needs the same > functionality for CXL PCIe Ports operating in Virtual Hierarchy (VH) > mode.[1] > > CXL and PCIe Protocol Error handling have different requirements that > necessitate a separate handling path. The AER service driver may try to > recover PCIe uncorrectable non-fatal errors (UCE). The same recovery is not > suitable for CXL PCIe Port devices because of potential for system memory > corruption. Instead, CXL Protocol Error handling must use a kernel panic > in the case of a fatal or non-fatal UCE. The AER driver's PCIe Protocol > Error handling does not panic the kernel in response to a UCE. > > Introduce a separate path for CXL Protocol Error handling in the AER > service driver. This will allow CXL Protocol Errors to use CXL specific > handling instead of PCIe handling. Add the CXL specific changes without > affecting or adding functionality in the PCIe handling. > > Make this update alongside the existing Downstream Port RCH error handling > logic, extending support to CXL PCIe Ports in VH mode. > > is_internal_error() is currently limited by CONFIG_PCIEAER_CXL kernel > config. Update is_internal_error()'s function declaration such that it is > always available regardless if CONFIG_PCIEAER_CXL kernel config is enabled > or disabled. > > The uncorrectable error (UCE) handling will be added in a future patch. > > [1] CXL 3.1 Spec, 12.2.2 CXL Root Ports, Downstream Switch Ports, and > Upstream Switch Ports > > Signed-off-by: Terry Bowman <terry.bowman@xxxxxxx> > Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> > Reviewed-by: Dave Jiang <dave.jiang@xxxxxxxxx> Reviewed-by: Ira Weiny <ira.weiny@xxxxxxxxx> [snip]
