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    x86/intel_rdt: Show bitmask of shareable resource with other executing units · 0dd2d749
    Fenghua Yu 提交于
    CPUID.(EAX=0x10, ECX=res#):EBX[31:0] reports a bit mask for a resource.
    Each set bit within the length of the CBM indicates the corresponding
    unit of the resource allocation may be used by other entities in the
    platform (e.g. an integrated graphics engine or hardware units outside
    the processor core and have direct access to the resource). Each
    cleared bit within the length of the CBM indicates the corresponding
    allocation unit can be configured to implement a priority-based
    allocation scheme without interference with other hardware agents in
    the system. Bits outside the length of the CBM are reserved.
    
    More details on the bit mask are described in x86 Software Developer's
    Manual.
    
    The bitmask is shown in "info" directory for each resource. It's
    up to user to decide how to use the bitmask within a CBM in a partition
    to share or isolate a resource with other executing units.
    Suggested-by: NReinette Chatre <reinette.chatre@intel.com>
    Signed-off-by: NFenghua Yu <fenghua.yu@intel.com>
    Signed-off-by: NTony Luck <tony.luck@intel.com>
    Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
    Cc: ravi.v.shankar@intel.com
    Cc: peterz@infradead.org
    Cc: eranian@google.com
    Cc: ak@linux.intel.com
    Cc: davidcc@google.com
    Cc: vikas.shivappa@linux.intel.com
    Link: http://lkml.kernel.org/r/20170725223904.12996-1-tony.luck@intel.com
    0dd2d749
intel_rdt.h 11.8 KB