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hc

2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/arch/powerpc/perf/hv-gpci.c
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@@ -72,7 +72,7 @@
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 static struct attribute_group event_group = {
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 	.name  = "events",
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-	.attrs = hv_gpci_event_attrs,
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+	/* .attrs is set in init */
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 };
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 #define HV_CAPS_ATTR(_name, _format)				\
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@@ -330,6 +330,7 @@
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 	int r;
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 	unsigned long hret;
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 	struct hv_perf_caps caps;
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+	struct hv_gpci_request_buffer *arg;
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 	hv_gpci_assert_offsets_correct();
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@@ -353,6 +354,36 @@
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 	/* sampling not supported */
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 	h_gpci_pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;
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+	arg = (void *)get_cpu_var(hv_gpci_reqb);
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+	memset(arg, 0, HGPCI_REQ_BUFFER_SIZE);
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+
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+	/*
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+	 * hcall H_GET_PERF_COUNTER_INFO populates the output
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+	 * counter_info_version value based on the system hypervisor.
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+	 * Pass the counter request 0x10 corresponds to request type
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+	 * 'Dispatch_timebase_by_processor', to get the supported
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+	 * counter_info_version.
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+	 */
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+	arg->params.counter_request = cpu_to_be32(0x10);
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+
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+	r = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO,
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+			virt_to_phys(arg), HGPCI_REQ_BUFFER_SIZE);
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+	if (r) {
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+		pr_devel("hcall failed, can't get supported counter_info_version: 0x%x\n", r);
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+		arg->params.counter_info_version_out = 0x8;
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+	}
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+
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+	/*
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+	 * Use counter_info_version_out value to assign
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+	 * required hv-gpci event list.
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+	 */
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+	if (arg->params.counter_info_version_out >= 0x8)
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+		event_group.attrs = hv_gpci_event_attrs;
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+	else
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+		event_group.attrs = hv_gpci_event_attrs_v6;
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+
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+	put_cpu_var(hv_gpci_reqb);
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+
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 	r = perf_pmu_register(&h_gpci_pmu, h_gpci_pmu.name, -1);
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 	if (r)
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 		return r;