1 // SPDX-License-Identifier: GPL-2.0-only
3  * Performance events - AMD Processor Power Reporting Mechanism
5  * Copyright (C) 2016 Advanced Micro Devices, Inc.
16 /* Event code: LSB 8 bits, passed in attr->config any other bit is reserved. */
45 	struct hw_perf_event *hwc = &event->hw;  in event_update()
49 	prev_pwr_acc = hwc->pwr_acc;  in event_update()
50 	prev_ptsc = hwc->ptsc;  in event_update()
56 	 * final value (delta) is micro-Watts. Then add it to the event count.  in event_update()
60 		delta -= prev_pwr_acc;  in event_update()
62 		delta = new_pwr_acc - prev_pwr_acc;  in event_update()
65 	tdelta = new_ptsc - prev_ptsc;  in event_update()
68 	local64_add(delta, &event->count);  in event_update()
73 	if (WARN_ON_ONCE(!(event->hw.state & PERF_HES_STOPPED)))  in __pmu_event_start()
76 	event->hw.state = 0;  in __pmu_event_start()
78 	rdmsrl(MSR_F15H_PTSC, event->hw.ptsc);  in __pmu_event_start()
79 	rdmsrl(MSR_F15H_CU_PWR_ACCUMULATOR, event->hw.pwr_acc);  in __pmu_event_start()
89 	struct hw_perf_event *hwc = &event->hw;  in pmu_event_stop()
92 	if (!(hwc->state & PERF_HES_STOPPED))  in pmu_event_stop()
93 		hwc->state |= PERF_HES_STOPPED;  in pmu_event_stop()
96 	if ((mode & PERF_EF_UPDATE) && !(hwc->state & PERF_HES_UPTODATE)) {  in pmu_event_stop()
102 		hwc->state |= PERF_HES_UPTODATE;  in pmu_event_stop()
108 	struct hw_perf_event *hwc = &event->hw;  in pmu_event_add()
110 	hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED;  in pmu_event_add()
125 	u64 cfg = event->attr.config & AMD_POWER_EVENT_MASK;  in pmu_event_init()
128 	if (event->attr.type != pmu_class.type)  in pmu_event_init()
129 		return -ENOENT;  in pmu_event_init()
132 	if (event->attr.sample_period)  in pmu_event_init()
133 		return -EINVAL;  in pmu_event_init()
136 		return -EINVAL;  in pmu_event_init()
167 EVENT_ATTR_STR(power-pkg, power_pkg, "event=0x01");
169 EVENT_ATTR_STR(power-pkg.unit, power_pkg_unit, "mWatts");
171 /* Convert the count from micro-Watts to milli-Watts. */
172 EVENT_ATTR_STR(power-pkg.scale, power_pkg_scale, "1.000000e-3");
186 PMU_FORMAT_ATTR(event, "config:0-7");
207 	/* system-wide only */
268 		return -ENODEV;  in amd_power_pmu_init()
271 		return -ENODEV;  in amd_power_pmu_init()
277 		return -ENODEV;  in amd_power_pmu_init()
285 	ret = perf_pmu_register(&pmu_class, "power", -1);  in amd_power_pmu_init()