cpupower: Add cpuid cap flag for MSR_AMD_HWCR support

Remove the family check for accessing the MSR_AMD_HWCR MSR and replace
it with a cpupower cap flag.

This update also allows for the removal of the local cpupower_cpu_info
variable in cpufreq_has_boost_support() since we no longer need it to
check the family.
Signed-off-by: Nathan Fontenot <nathan.fontenot@amd.com>
Reviewed-by: Robert Richter <rrichter@amd.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/power/cpupower/utils/helpers/cpuid.c

@@ -129,9 +129,13 @@ int get_cpu_info(struct cpupower_cpu_info *cpu_info)
 	if (cpu_info->vendor == X86_VENDOR_AMD ||
 	    cpu_info->vendor == X86_VENDOR_HYGON) {
 		if (ext_cpuid_level >= 0x80000007) {
-			if (cpuid_edx(0x80000007) & (1 << 9))
+			if (cpuid_edx(0x80000007) & (1 << 9)) {
 				cpu_info->caps |= CPUPOWER_CAP_AMD_CPB;
 
+				if (cpu_info->family >= 0x17)
+					cpu_info->caps |= CPUPOWER_CAP_AMD_CPB_MSR;
+			}
+
 			if ((cpuid_edx(0x80000007) & (1 << 7)) &&
 			    cpu_info->family != 0x14) {
 				/* HW pstate was not implemented in family 0x14 */

tools/power/cpupower/utils/helpers/helpers.h

@@ -72,6 +72,7 @@ enum cpupower_cpu_vendor {X86_VENDOR_UNKNOWN = 0, X86_VENDOR_INTEL,
 #define CPUPOWER_CAP_AMD_RDPRU		0x00000080
 #define CPUPOWER_CAP_AMD_HW_PSTATE	0x00000100
 #define CPUPOWER_CAP_AMD_PSTATEDEF	0x00000200
+#define CPUPOWER_CAP_AMD_CPB_MSR	0x00000400
 
 #define CPUPOWER_AMD_CPBDIS		0x02000000
 

tools/power/cpupower/utils/helpers/misc.c

@@ -16,16 +16,11 @@
 int cpufreq_has_boost_support(unsigned int cpu, int *support, int *active,
 			int *states)
 {
-	struct cpupower_cpu_info cpu_info;
 	int ret;
 	unsigned long long val;
 
 	*support = *active = *states = 0;
 
-	ret = get_cpu_info(&cpu_info);
-	if (ret)
-		return ret;
-
 	if (cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_CPB) {
 		*support = 1;
 
@@ -34,7 +29,7 @@ int cpufreq_has_boost_support(unsigned int cpu, int *support, int *active,
 		 * has Hardware determined variable increments instead.
 		 */
 
-		if (cpu_info.family == 0x17 || cpu_info.family == 0x18) {
+		if (cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_CPB_MSR) {
 			if (!read_msr(cpu, MSR_AMD_HWCR, &val)) {
 				if (!(val & CPUPOWER_AMD_CPBDIS))
 					*active = 1;