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On 9/2/25 3:41 PM, 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 SDCIAE feature details are documented in APM [1] available from [2]. > [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) Compare with how indentation of ABMC "x86,fs/resctrl: Implement resctrl_arch_config_cntr() to assign a counter with ABMC" was changed during merge. [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) (also applies to patch #4) > > Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537 # [2] Please place "Link:" tag at end to reduce needed adjustments during merge. > Signed-off-by: Babu Moger > Acked-by: Borislav Petkov (AMD) > Reviewed-by: Reinette Chatre > --- Reinette