x86/intel_rdt/mba: Add schemata file support for MBA

Add support to update the MBA bandwidth values for the domains via the
schemata file.

 - Verify that the bandwidth value is valid

 - Round to the next control step depending on the bandwidth granularity of
   the hardware

 - Convert the bandwidth to delay values and write the delay values to
   the corresponding domain PQOS_MSRs.

[ tglx: Massaged changelog ]

Signed-off-by: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Cc: ravi.v.shankar@intel.com
Cc: tony.luck@intel.com
Cc: fenghua.yu@intel.com
Cc: vikas.shivappa@intel.com
Link: http://lkml.kernel.org/r/1491611637-20417-9-git-send-email-vikas.shivappa@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/kernel/cpu/intel_rdt.c

@@ -116,6 +116,8 @@ struct rdt_resource rdt_resources_all[] = {
 		.msr_base		= IA32_MBA_THRTL_BASE,
 		.msr_update		= mba_wrmsr,
 		.cache_level		= 3,
+		.parse_ctrlval		= parse_bw,
+		.format_str		= "%d=%*d",
 	},
 };