This series adds the support for L3 Smart Data Cache Injection Allocation Enforcement (SDCIAE) to resctrl infrastructure. Upcoming AMD hardware implements Smart Data Cache Injection (SDCI). 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 limit the portion of the L3 cache used for SDCI. The feature details are documented in the 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 The feature requires linux support of TPH (TLP Processing Hints). The support is ongoing and patches are currently under review. https://lore.kernel.org/lkml/20240717205511.2541693-2-wei.huang2@xxxxxxx/ The patches are based on top of commit ad1b4b6ed19f (tip/master) Merge branch into tip/master: 'x86/timers' Babu Moger (7): x86/cpufeatures: Add support for L3 Smart Data Cache Injection Allocation Enforcement x86/resctrl: Add SDCIAE feature in the command line options x86/resctrl: Introduce sdciae_capable in rdt_resource x86/resctrl: Implement SDCIAE enable/disable x86/resctrl: Add interface to enable/disable SDCIAE x86/resctrl: Introduce interface to display SDCIAE Capacity Bit Masks x86/resctrl: Introduce interface to modify SDCIAE Capacity Bit Masks .../admin-guide/kernel-parameters.txt | 2 +- Documentation/arch/x86/resctrl.rst | 29 ++ arch/x86/include/asm/cpufeatures.h | 1 + arch/x86/include/asm/msr-index.h | 1 + arch/x86/kernel/cpu/cpuid-deps.c | 1 + arch/x86/kernel/cpu/resctrl/core.c | 10 + arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 4 +- arch/x86/kernel/cpu/resctrl/internal.h | 15 + arch/x86/kernel/cpu/resctrl/rdtgroup.c | 298 ++++++++++++++++++ arch/x86/kernel/cpu/scattered.c | 1 + include/linux/resctrl.h | 2 + 11 files changed, 361 insertions(+), 3 deletions(-) -- 2.34.1
