diff options
Diffstat (limited to 'arch/x86/include/asm/intel_rdt_common.h')
| -rw-r--r-- | arch/x86/include/asm/intel_rdt_common.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/x86/include/asm/intel_rdt_common.h b/arch/x86/include/asm/intel_rdt_common.h index e6e15cfd083f..b31081b89407 100644 --- a/arch/x86/include/asm/intel_rdt_common.h +++ b/arch/x86/include/asm/intel_rdt_common.h @@ -3,4 +3,25 @@ #define MSR_IA32_PQR_ASSOC 0x0c8f +/** + * struct intel_pqr_state - State cache for the PQR MSR + * @rmid: The cached Resource Monitoring ID + * @closid: The cached Class Of Service ID + * @rmid_usecnt: The usage counter for rmid + * + * The upper 32 bits of MSR_IA32_PQR_ASSOC contain closid and the + * lower 10 bits rmid. The update to MSR_IA32_PQR_ASSOC always + * contains both parts, so we need to cache them. + * + * The cache also helps to avoid pointless updates if the value does + * not change. + */ +struct intel_pqr_state { + u32 rmid; + u32 closid; + int rmid_usecnt; +}; + +DECLARE_PER_CPU(struct intel_pqr_state, pqr_state); + #endif /* _ASM_X86_INTEL_RDT_COMMON_H */ |