On Wed, 30 Jul 2025 16:47:09 -0500 Ben Cheatham <Benjamin.Cheatham@xxxxxxx> wrote: > Register a CXL isolation interrupt handler as part of cxl_dport set up. > Only CXL-capable PCIe Root Ports have CXL.mem isolation interrupt support. > The interrupts are left masked and will be unmasked in a later commit. > > A CXL-capable PCIe Root Port that has CXL.mem isolation support and no > interrupt support will have any isolation support enabled. If > isolation were enabled without interrupts CXL.mem transactions could > return poisoned data. This could cause data/system corruption if left > unhandled, so the capability is left disabled in this case. > > CXL endpoint drivers can add an isolation handler for a device through > the isolation_handler member of struct cxl_dev_state. If this handler > is not present, the system will panic. If the handler opts to not panic > (i.e. returns "CXL_ERR_NONE"), the endpoint driver is charged with > maintaining system reliability (cleaning up CXL memory, disabling device > state, etc.). > > Signed-off-by: Ben Cheatham <Benjamin.Cheatham@xxxxxxx> > /** > * cxl_dport_enable_isolation - Enable CXL Isolation for a CXL dport. This is > * an optional capability only supported by PCIe Root Ports. > - * Make the edit on original patch if you want to get rid of this line. > + * @host: Host device for @dport > * @dport: CXL-capable PCIe Root Port > * > * Returns 0 if capability unsupported, or when enabled. > */
