33  * - There are three types of index to access perf counters (PMC):
41  *     3. Global PMC Index (named pmc): pmc is an index specific to PMU
42  *        code. Each pmc, stored in kvm_pmc.idx field, is unique across
44  *        between pmc and perf counters is as the following:
62 	struct kvm_pmc *pmc = perf_event->overflow_handler_context;  in kvm_perf_overflow()  local
63 	struct kvm_pmu *pmu = pmc_to_pmu(pmc);  in kvm_perf_overflow()
65 	if (!test_and_set_bit(pmc->idx, pmu->reprogram_pmi)) {  in kvm_perf_overflow()
66 		__set_bit(pmc->idx, (unsigned long *)&pmu->global_status);  in kvm_perf_overflow()
67 		kvm_make_request(KVM_REQ_PMU, pmc->vcpu);  in kvm_perf_overflow()
75 	struct kvm_pmc *pmc = perf_event->overflow_handler_context;  in kvm_perf_overflow_intr()  local
76 	struct kvm_pmu *pmu = pmc_to_pmu(pmc);  in kvm_perf_overflow_intr()
78 	if (!test_and_set_bit(pmc->idx, pmu->reprogram_pmi)) {  in kvm_perf_overflow_intr()
79 		__set_bit(pmc->idx, (unsigned long *)&pmu->global_status);  in kvm_perf_overflow_intr()
80 		kvm_make_request(KVM_REQ_PMU, pmc->vcpu);  in kvm_perf_overflow_intr()
91 			irq_work_queue(&pmc_to_pmu(pmc)->irq_work);  in kvm_perf_overflow_intr()
93 			kvm_make_request(KVM_REQ_PMI, pmc->vcpu);  in kvm_perf_overflow_intr()
97 static void pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type,  in pmc_reprogram_counter()  argument
114 	attr.sample_period = get_sample_period(pmc, pmc->counter);  in pmc_reprogram_counter()
130 						 kvm_perf_overflow, pmc);  in pmc_reprogram_counter()
132 		pr_debug_ratelimited("kvm_pmu: event creation failed %ld for pmc->idx = %d\n",  in pmc_reprogram_counter()
133 			    PTR_ERR(event), pmc->idx);  in pmc_reprogram_counter()
137 	pmc->perf_event = event;  in pmc_reprogram_counter()
138 	pmc_to_pmu(pmc)->event_count++;  in pmc_reprogram_counter()
139 	clear_bit(pmc->idx, pmc_to_pmu(pmc)->reprogram_pmi);  in pmc_reprogram_counter()
142 static void pmc_pause_counter(struct kvm_pmc *pmc)  in pmc_pause_counter()  argument
144 	u64 counter = pmc->counter;  in pmc_pause_counter()
146 	if (!pmc->perf_event)  in pmc_pause_counter()
150 	counter += perf_event_pause(pmc->perf_event, true);  in pmc_pause_counter()
151 	pmc->counter = counter & pmc_bitmask(pmc);  in pmc_pause_counter()
154 static bool pmc_resume_counter(struct kvm_pmc *pmc)  in pmc_resume_counter()  argument
156 	if (!pmc->perf_event)  in pmc_resume_counter()
160 	if (perf_event_period(pmc->perf_event,  in pmc_resume_counter()
161 			      get_sample_period(pmc, pmc->counter)))  in pmc_resume_counter()
165 	perf_event_enable(pmc->perf_event);  in pmc_resume_counter()
167 	clear_bit(pmc->idx, (unsigned long *)&pmc_to_pmu(pmc)->reprogram_pmi);  in pmc_resume_counter()
171 void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel)  in reprogram_gp_counter()  argument
175 	struct kvm *kvm = pmc->vcpu->kvm;  in reprogram_gp_counter()
183 	pmc->eventsel = eventsel;  in reprogram_gp_counter()
185 	pmc_pause_counter(pmc);  in reprogram_gp_counter()
187 	if (!(eventsel & ARCH_PERFMON_EVENTSEL_ENABLE) || !pmc_is_enabled(pmc))  in reprogram_gp_counter()
214 		config = kvm_x86_ops.pmu_ops->find_arch_event(pmc_to_pmu(pmc),  in reprogram_gp_counter()
224 	if (pmc->current_config == eventsel && pmc_resume_counter(pmc))  in reprogram_gp_counter()
227 	pmc_release_perf_event(pmc);  in reprogram_gp_counter()
229 	pmc->current_config = eventsel;  in reprogram_gp_counter()
230 	pmc_reprogram_counter(pmc, type, config,  in reprogram_gp_counter()
239 void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int idx)  in reprogram_fixed_counter()  argument
244 	struct kvm *kvm = pmc->vcpu->kvm;  in reprogram_fixed_counter()
246 	pmc_pause_counter(pmc);  in reprogram_fixed_counter()
248 	if (!en_field || !pmc_is_enabled(pmc))  in reprogram_fixed_counter()
261 	if (pmc->current_config == (u64)ctrl && pmc_resume_counter(pmc))  in reprogram_fixed_counter()
264 	pmc_release_perf_event(pmc);  in reprogram_fixed_counter()
266 	pmc->current_config = (u64)ctrl;  in reprogram_fixed_counter()
267 	pmc_reprogram_counter(pmc, PERF_TYPE_HARDWARE,  in reprogram_fixed_counter()
277 	struct kvm_pmc *pmc = kvm_x86_ops.pmu_ops->pmc_idx_to_pmc(pmu, pmc_idx);  in reprogram_counter()  local
279 	if (!pmc)  in reprogram_counter()
282 	if (pmc_is_gp(pmc))  in reprogram_counter()
283 		reprogram_gp_counter(pmc, pmc->eventsel);  in reprogram_counter()
288 		reprogram_fixed_counter(pmc, ctrl, idx);  in reprogram_counter()
299 		struct kvm_pmc *pmc = kvm_x86_ops.pmu_ops->pmc_idx_to_pmc(pmu, bit);  in kvm_pmu_handle_event()  local
301 		if (unlikely(!pmc || !pmc->perf_event)) {  in kvm_pmu_handle_event()
362 	struct kvm_pmc *pmc;  in kvm_pmu_rdpmc()  local
371 	pmc = kvm_x86_ops.pmu_ops->rdpmc_ecx_to_pmc(vcpu, idx, &mask);  in kvm_pmu_rdpmc()
372 	if (!pmc)  in kvm_pmu_rdpmc()
380 	*data = pmc_read_counter(pmc) & mask;  in kvm_pmu_rdpmc()
399 	struct kvm_pmc *pmc = kvm_x86_ops.pmu_ops->msr_idx_to_pmc(vcpu, msr);  in kvm_pmu_mark_pmc_in_use()  local
401 	if (pmc)  in kvm_pmu_mark_pmc_in_use()
402 		__set_bit(pmc->idx, pmu->pmc_in_use);  in kvm_pmu_mark_pmc_in_use()
445 static inline bool pmc_speculative_in_use(struct kvm_pmc *pmc)  in pmc_speculative_in_use()  argument
447 	struct kvm_pmu *pmu = pmc_to_pmu(pmc);  in pmc_speculative_in_use()
449 	if (pmc_is_fixed(pmc))  in pmc_speculative_in_use()
451 			pmc->idx - INTEL_PMC_IDX_FIXED) & 0x3;  in pmc_speculative_in_use()
453 	return pmc->eventsel & ARCH_PERFMON_EVENTSEL_ENABLE;  in pmc_speculative_in_use()
460 	struct kvm_pmc *pmc = NULL;  in kvm_pmu_cleanup()  local
470 		pmc = kvm_x86_ops.pmu_ops->pmc_idx_to_pmc(pmu, i);  in kvm_pmu_cleanup()
472 		if (pmc && pmc->perf_event && !pmc_speculative_in_use(pmc))  in kvm_pmu_cleanup()
473 			pmc_stop_counter(pmc);  in kvm_pmu_cleanup()