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x86/resctrl: Query LLC monitoring properties once during boot

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Cache and memory bandwidth monitoring are features that are part of
x86 CPU resource control that is supported by the resctrl subsystem.
The monitoring properties are obtained via CPUID from every CPU
and only used within the resctrl subsystem where the properties are
only read from boot_cpu_data.

Obtain the monitoring properties once, placed in boot_cpu_data, via the
->c_bsp_init() helpers of the vendors that support X86_FEATURE_CQM_LLC.

Suggested-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/6d74a6ac3e69f4b7a8b4115835f9455faf0f468d.1588715690.git.reinette.chatre@intel.com
This commit is contained in:
Reinette Chatre
2020-05-05 15:36:15 -07:00
committed by Borislav Petkov
parent f0d339db56
commit 923f3a2b48
4 changed files with 11 additions and 2 deletions
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2
arch/x86/kernel/cpu/common.c
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@@ -56,7 +56,6 @@
#include <asm/intel-family.h>
#include <asm/cpu_device_id.h>
#include <asm/uv/uv.h>
#include <asm/resctrl.h>
#include "cpu.h"
@@ -922,7 +921,6 @@ void get_cpu_cap(struct cpuinfo_x86 *c)
init_scattered_cpuid_features(c);
init_speculation_control(c);
resctrl_cpu_detect(c);
/*
* Clear/Set all flags overridden by options, after probe.