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
8int 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