On Thu, Aug 14, 2025 at 10:25:31AM +0100, James Clark wrote: > SPE_FEAT_FDS adds the ability to filter on the data source of packets. > Like the other existing filters, enable filtering with PMSFCR_EL1.FDS > when any of the filter bits are set. > > Each bit maps to data sources 0-63 described by bits[0:5] in the data > source packet (although the full range of data source is 16 bits so > higher value data sources can't be filtered on). The filter is an OR of > all the bits, so for example clearing bits 0 and 3 only includes packets > from data sources 0 OR 3. > > Invert the filter given by userspace so that the default value of 0 is > equivalent to including all values (no filtering). This allows us to > skip adding a new format bit to enable filtering and still support > excluding all data sources which would have been a filter value of 0 if > not for the inversion. > > Tested-by: Leo Yan <leo.yan@xxxxxxx> > Signed-off-by: James Clark <james.clark@xxxxxxxxxx> Reviewed-by: Leo Yan <leo.yan@xxxxxxx>
