x86/ACPI: CPPC: Move AMD maximum frequency ratio setting function into x86 CPPC

The AMD maximum frequency ratio setting function depends on CPPC, so the
x86 CPPC implementation file is better space for this function.

Signed-off-by: Huang Rui <ray.huang@amd.com>
[ rjw: Subject adjustment ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/arch/x86/kernel/acpi/cppc.c b/arch/x86/kernel/acpi/cppc.c
index 08d823d72586..f0be5058e3e3 100644
--- a/arch/x86/kernel/acpi/cppc.c
+++ b/arch/x86/kernel/acpi/cppc.c
@@ -6,6 +6,8 @@
 
 #include <acpi/cppc_acpi.h>
 #include <asm/msr.h>
+#include <asm/processor.h>
+#include <asm/topology.h>
 
 /* Refer to drivers/acpi/cppc_acpi.c for the description of functions */
 
@@ -47,3 +49,41 @@ int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val)
 	}
 	return err;
 }
+
+bool amd_set_max_freq_ratio(u64 *ratio)
+{
+	struct cppc_perf_caps perf_caps;
+	u64 highest_perf, nominal_perf;
+	u64 perf_ratio;
+	int rc;
+
+	if (!ratio)
+		return false;
+
+	rc = cppc_get_perf_caps(0, &perf_caps);
+	if (rc) {
+		pr_debug("Could not retrieve perf counters (%d)\n", rc);
+		return false;
+	}
+
+	highest_perf = amd_get_highest_perf();
+	nominal_perf = perf_caps.nominal_perf;
+
+	if (!highest_perf || !nominal_perf) {
+		pr_debug("Could not retrieve highest or nominal performance\n");
+		return false;
+	}
+
+	perf_ratio = div_u64(highest_perf * SCHED_CAPACITY_SCALE, nominal_perf);
+	/* midpoint between max_boost and max_P */
+	perf_ratio = (perf_ratio + SCHED_CAPACITY_SCALE) >> 1;
+	if (!perf_ratio) {
+		pr_debug("Non-zero highest/nominal perf values led to a 0 ratio\n");
+		return false;
+	}
+
+	*ratio = perf_ratio;
+	arch_set_max_freq_ratio(false);
+
+	return true;
+}