1 // SPDX-License-Identifier: GPL-2.0
2 #if defined(__i386__) || defined(__x86_64__)
3 
4 #include "helpers/helpers.h"
5 
6 #define MSR_AMD_HWCR	0xc0010015
7 
8 int cpufreq_has_boost_support(unsigned int cpu, int *support, int *active,
9 			int *states)
10 {
11 	struct cpupower_cpu_info cpu_info;
12 	int ret;
13 	unsigned long long val;
14 
15 	*support = *active = *states = 0;
16 
17 	ret = get_cpu_info(&cpu_info);
18 	if (ret)
19 		return ret;
20 
21 	if (cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_CBP) {
22 		*support = 1;
23 
24 		/* AMD Family 0x17 does not utilize PCI D18F4 like prior
25 		 * families and has no fixed discrete boost states but
26 		 * has Hardware determined variable increments instead.
27 		 */
28 
29 		if (cpu_info.family == 0x17 || cpu_info.family == 0x18) {
30 			if (!read_msr(cpu, MSR_AMD_HWCR, &val)) {
31 				if (!(val & CPUPOWER_AMD_CPBDIS))
32 					*active = 1;
33 			}
34 		} else {
35 			ret = amd_pci_get_num_boost_states(active, states);
36 			if (ret)
37 				return ret;
38 		}
39 	} else if (cpupower_cpu_info.caps & CPUPOWER_CAP_INTEL_IDA)
40 		*support = *active = 1;
41 	return 0;
42 }
43 #endif /* #if defined(__i386__) || defined(__x86_64__) */
44