diff options
| author |   Janakarajan Natarajan <Janakarajan.Natarajan@amd.com> | 2019-11-05 17:16:55 +0000 |
|---|---|---|
| committer |   Shuah Khan <skhan@linuxfoundation.org> | 2019-11-05 17:22:56 -0700 |
| commit | 6af2ed53f0402c09b36d2b38698e18a25ca732a7 (patch) | |
| tree | ea83341eecb9c5b048929e9aa75abf140ae48a3c /tools/power/cpupower/utils/helpers/helpers.h | |
| parent | cpupower: mperf_monitor: Introduce per_cpu_schedule flag (diff) | |
| download | linux-dev-6af2ed53f0402c09b36d2b38698e18a25ca732a7.tar.xz linux-dev-6af2ed53f0402c09b36d2b38698e18a25ca732a7.zip | |
cpupower: mperf_monitor: Update cpupower to use the RDPRU instruction
AMD Zen 2 introduces the RDPRU instruction which can be used to access some
processor registers which are typically only accessible in privilege level
0. ECX specifies the register to read and EDX:EAX will contain the value read.
ECX: 0 - Register MPERF
1 - Register APERF
This has the added advantage of not having to use the msr module, since the
userspace to kernel transitions which occur during each read_msr() might
cause APERF and MPERF to go out of sync.
Signed-off-by: Janakarajan Natarajan <Janakarajan.Natarajan@amd.com>
Acked-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Diffstat (limited to 'tools/power/cpupower/utils/helpers/helpers.h')
| -rw-r--r-- | tools/power/cpupower/utils/helpers/helpers.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/power/cpupower/utils/helpers/helpers.h b/tools/power/cpupower/utils/helpers/helpers.h index 357b19bb136e..c258eeccd05f 100644 --- a/tools/power/cpupower/utils/helpers/helpers.h +++ b/tools/power/cpupower/utils/helpers/helpers.h @@ -69,6 +69,7 @@ enum cpupower_cpu_vendor {X86_VENDOR_UNKNOWN = 0, X86_VENDOR_INTEL, #define CPUPOWER_CAP_HAS_TURBO_RATIO 0x00000010 #define CPUPOWER_CAP_IS_SNB 0x00000020 #define CPUPOWER_CAP_INTEL_IDA 0x00000040 +#define CPUPOWER_CAP_AMD_RDPRU 0x00000080 #define CPUPOWER_AMD_CPBDIS 0x02000000 |