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 
hv_perf_caps_get(struct hv_perf_caps * caps)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