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b09d981b3f
Separate the ctrl cpus file handling from the generic cpus file handling and convert the per cpu closid from u32 to a struct which will be used later to add rmid to the same struct. Also cleanup some name space. 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/1501017287-28083-17-git-send-email-vikas.shivappa@linux.intel.com
72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
#ifndef _ASM_X86_INTEL_RDT_SCHED_H
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#define _ASM_X86_INTEL_RDT_SCHED_H
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#ifdef CONFIG_INTEL_RDT
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#include <linux/sched.h>
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#include <linux/jump_label.h>
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#define IA32_PQR_ASSOC 0x0c8f
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/**
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* struct intel_pqr_state - State cache for the PQR MSR
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* @rmid: The cached Resource Monitoring ID
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* @closid: The cached Class Of Service ID
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*
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* The upper 32 bits of IA32_PQR_ASSOC contain closid and the
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* lower 10 bits rmid. The update to IA32_PQR_ASSOC always
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* contains both parts, so we need to cache them.
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*
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* The cache also helps to avoid pointless updates if the value does
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* not change.
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*/
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struct intel_pqr_state {
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u32 rmid;
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u32 closid;
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};
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DECLARE_PER_CPU(struct intel_pqr_state, pqr_state);
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DECLARE_PER_CPU_READ_MOSTLY(struct intel_pqr_state, rdt_cpu_default);
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DECLARE_STATIC_KEY_FALSE(rdt_alloc_enable_key);
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/*
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* intel_rdt_sched_in() - Writes the task's CLOSid to IA32_PQR_MSR
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*
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* Following considerations are made so that this has minimal impact
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* on scheduler hot path:
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* - This will stay as no-op unless we are running on an Intel SKU
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* which supports resource control and we enable by mounting the
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* resctrl file system.
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* - Caches the per cpu CLOSid values and does the MSR write only
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* when a task with a different CLOSid is scheduled in.
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*
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* Must be called with preemption disabled.
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*/
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static inline void intel_rdt_sched_in(void)
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{
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if (static_branch_likely(&rdt_alloc_enable_key)) {
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struct intel_pqr_state *state = this_cpu_ptr(&pqr_state);
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u32 closid;
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/*
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* If this task has a closid assigned, use it.
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* Else use the closid assigned to this cpu.
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*/
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closid = current->closid;
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if (closid == 0)
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closid = this_cpu_read(rdt_cpu_default.closid);
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if (closid != state->closid) {
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state->closid = closid;
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wrmsr(IA32_PQR_ASSOC, state->rmid, closid);
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}
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}
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}
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#else
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static inline void intel_rdt_sched_in(void) {}
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#endif /* CONFIG_INTEL_RDT */
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#endif /* _ASM_X86_INTEL_RDT_SCHED_H */
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