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x86/intel_rdt/cqm: Add sched_in support

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OS associates an RMID/CLOSid to a task by writing the per CPU
IA32_PQR_ASSOC MSR when a task is scheduled in.

The sched_in code will stay as no-op unless we are running on Intel SKU
which supports either resource control or monitoring and we also enable
them by mounting the resctrl fs.  The per cpu CLOSid/RMID values are
cached and the write is performed only when a task with a different
CLOSid/RMID is scheduled in.

Signed-off-by: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: ravi.v.shankar@intel.com
Cc: tony.luck@intel.com
Cc: fenghua.yu@intel.com
Cc: peterz@infradead.org
Cc: eranian@google.com
Cc: vikas.shivappa@intel.com
Cc: ak@linux.intel.com
Cc: davidcc@google.com
Cc: reinette.chatre@intel.com
Link: http://lkml.kernel.org/r/1501017287-28083-25-git-send-email-vikas.shivappa@linux.intel.com
This commit is contained in:
Vikas Shivappa
2017-07-25 14:14:43 -07:00
committed by Thomas Gleixner
parent 4be6c07842
commit 748b6b881c
2 changed files with 29 additions and 25 deletions
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4
arch/x86/kernel/cpu/intel_rdt.h
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@@ -22,8 +22,6 @@
#define RMID_VAL_ERROR BIT_ULL(63)
#define RMID_VAL_UNAVAIL BIT_ULL(62)
DECLARE_STATIC_KEY_FALSE(rdt_enable_key);
/**
* struct mon_evt - Entry in the event list of a resource
* @evtid: event id
@@ -61,8 +59,6 @@ extern bool rdt_alloc_capable;
extern bool rdt_mon_capable;
extern unsigned int rdt_mon_features;
DECLARE_STATIC_KEY_FALSE(rdt_mon_enable_key);
enum rdt_group_type {
RDTCTRL_GROUP = 0,
RDTMON_GROUP,