This MSR can be used to check whether the CPU frequency boost state
is enabled in the hardware control. User can change the boost state in
the BIOS setting,amd_pstate driver will update the boost state according
to this msr value.
AMD Processor Programming Reference (PPR)
Link: https://www.amd.com/system/files/TechDocs/40332.pdf [p1095]
Link: https://www.amd.com/system/files/TechDocs/56569-A1-PUB.zip [p162]
Signed-off-by: Perry Yuan <Perry.Yuan@amd.com>
---
arch/x86/include/asm/msr-index.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 6674bdb096f3..e5ea1c9f747b 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -569,6 +569,7 @@
#define MSR_AMD_CPPC_CAP2 0xc00102b2
#define MSR_AMD_CPPC_REQ 0xc00102b3
#define MSR_AMD_CPPC_STATUS 0xc00102b4
+#define MSR_AMD_CPPC_HW_CTL 0xc0010015
#define AMD_CPPC_LOWEST_PERF(x) (((x) >> 0) & 0xff)
#define AMD_CPPC_LOWNONLIN_PERF(x) (((x) >> 8) & 0xff)
@@ -579,6 +580,8 @@
#define AMD_CPPC_MIN_PERF(x) (((x) & 0xff) << 8)
#define AMD_CPPC_DES_PERF(x) (((x) & 0xff) << 16)
#define AMD_CPPC_ENERGY_PERF_PREF(x) (((x) & 0xff) << 24)
+#define AMD_CPPC_PRECISION_BOOST_BIT 25
+#define AMD_CPPC_PRECISION_BOOST_ENABLED BIT_ULL(AMD_CPPC_PRECISION_BOOST_BIT)
/* AMD Performance Counter Global Status and Control MSRs */
#define MSR_AMD64_PERF_CNTR_GLOBAL_STATUS 0xc0000300
--
2.34.1