1 // SPDX-License-Identifier: GPL-2.0
2 #include <asm/io.h>
3 #include <asm/hvcall.h>
4
5 #include "hv-gpci.h"
6 #include "hv-common.h"
7
8 unsigned long hv_perf_caps_get(struct hv_perf_caps *caps)
9 {
10 unsigned long r;
11 struct p {
12 struct hv_get_perf_counter_info_params params;
13 struct hv_gpci_system_performance_capabilities caps;
14 } __packed __aligned(sizeof(uint64_t));
15
16 struct p arg = {
17 .params = {
18 .counter_request = cpu_to_be32(
19 HV_GPCI_system_performance_capabilities),
20 .starting_index = cpu_to_be32(-1),
21 .counter_info_version_in = 0,
22 }
23 };
24
25 r = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO,
26 virt_to_phys(&arg), sizeof(arg));
27
28 if (r)
29 return r;
30
31 pr_devel("capability_mask: 0x%x\n", arg.caps.capability_mask);
32
33 caps->version = arg.params.counter_info_version_out;
34 caps->collect_privileged = !!arg.caps.perf_collect_privileged;
35 caps->ga = !!(arg.caps.capability_mask & HV_GPCI_CM_GA);
36 caps->expanded = !!(arg.caps.capability_mask & HV_GPCI_CM_EXPANDED);
37 caps->lab = !!(arg.caps.capability_mask & HV_GPCI_CM_LAB);
38
39 return r;
40 }
41
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