Hi Babu, On 7/10/25 10:16 AM, Babu Moger wrote: > Smart Data Cache Injection (SDCI) is a mechanism that enables direct > insertion of data from I/O devices into the L3 cache. By directly caching > data from I/O devices rather than first storing the I/O data in DRAM, > SDCI reduces demands on DRAM bandwidth and reduces latency to the processor > consuming the I/O data. > > The SDCIAE (SDCI Allocation Enforcement) PQE feature allows system software > to control the portion of the L3 cache used for SDCI. > > When enabled, SDCIAE forces all SDCI lines to be placed into the L3 cache > partitions identified by the highest-supported L3_MASK_n register, where n > is the maximum supported CLOSID. > > Add CPUID feature bit that can be used to configure SDCIAE. > > The feature details are documented in APM listed below [1]. > [1] AMD64 Architecture Programmer's Manual Volume 2: System Programming > Publication # 24593 Revision 3.41 section 19.4.7 L3 Smart Data Cache > Injection Allocation Enforcement (SDCIAE) > > Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537 > Signed-off-by: Babu Moger <babu.moger@xxxxxxx> > --- Reviewed-by: Reinette Chatre <reinette.chatre@xxxxxxxxx> Reinette
