1 // SPDX-License-Identifier: GPL-2.0
3  * ARMv6 Performance counter handling code.
7  * ARMv6 has 2 configurable performance counters and a single cycle counter.
16  * the event bus. The procedure for disabling a configurable counter is:
17  *	- change the counter to count the ETMEXTOUT[0] signal (0x20). This
18  *	  effectively stops the counter from counting.
19  *	- disable the counter's interrupt generation (each counter has it's
21  * Once stopped, the counter value can be written as 0 to reset.
23  * To enable a counter:
24  *	- enable the counter's interrupt generation.
25  *	- set the new event type.
27  * Note: the dedicated cycle counter only counts cycles and can't be
29  * cycle counter, we have to just disable the interrupt reporting and start
30  * ignoring that counter. When re-enabling, we have to reset the value and
107 	 * can use a raw counter.
130 #define ARMV6_PMCR_ENABLE		(1 << 0)
131 #define ARMV6_PMCR_CTR01_RESET		(1 << 1)
132 #define ARMV6_PMCR_CCOUNT_RESET		(1 << 2)
133 #define ARMV6_PMCR_CCOUNT_DIV		(1 << 3)
134 #define ARMV6_PMCR_COUNT0_IEN		(1 << 4)
135 #define ARMV6_PMCR_COUNT1_IEN		(1 << 5)
136 #define ARMV6_PMCR_CCOUNT_IEN		(1 << 6)
137 #define ARMV6_PMCR_COUNT0_OVERFLOW	(1 << 8)
138 #define ARMV6_PMCR_COUNT1_OVERFLOW	(1 << 9)
139 #define ARMV6_PMCR_CCOUNT_OVERFLOW	(1 << 10)
157 				  enum armv6_counters counter)  in armv6_pmcr_counter_has_overflowed()  argument
161 	if (ARMV6_CYCLE_COUNTER == counter)  in armv6_pmcr_counter_has_overflowed()
163 	else if (ARMV6_COUNTER0 == counter)  in armv6_pmcr_counter_has_overflowed()
165 	else if (ARMV6_COUNTER1 == counter)  in armv6_pmcr_counter_has_overflowed()
168 		WARN_ONCE(1, "invalid counter number (%d)\n", counter);  in armv6_pmcr_counter_has_overflowed()
175 	struct hw_perf_event *hwc = &event->hw;  in armv6pmu_read_counter()
176 	int counter = hwc->idx;  in armv6pmu_read_counter()  local
179 	if (ARMV6_CYCLE_COUNTER == counter)  in armv6pmu_read_counter()
180 		asm volatile("mrc   p15, 0, %0, c15, c12, 1" : "=r"(value));  in armv6pmu_read_counter()
181 	else if (ARMV6_COUNTER0 == counter)  in armv6pmu_read_counter()
183 	else if (ARMV6_COUNTER1 == counter)  in armv6pmu_read_counter()
186 		WARN_ONCE(1, "invalid counter number (%d)\n", counter);  in armv6pmu_read_counter()
193 	struct hw_perf_event *hwc = &event->hw;  in armv6pmu_write_counter()
194 	int counter = hwc->idx;  in armv6pmu_write_counter()  local
196 	if (ARMV6_CYCLE_COUNTER == counter)  in armv6pmu_write_counter()
197 		asm volatile("mcr   p15, 0, %0, c15, c12, 1" : : "r"(value));  in armv6pmu_write_counter()
198 	else if (ARMV6_COUNTER0 == counter)  in armv6pmu_write_counter()
200 	else if (ARMV6_COUNTER1 == counter)  in armv6pmu_write_counter()
203 		WARN_ONCE(1, "invalid counter number (%d)\n", counter);  in armv6pmu_write_counter()
209 	struct hw_perf_event *hwc = &event->hw;  in armv6pmu_enable_event()
210 	int idx = hwc->idx;  in armv6pmu_enable_event()
217 		evt	= (hwc->config_base << ARMV6_PMCR_EVT_COUNT0_SHIFT) |  in armv6pmu_enable_event()
221 		evt	= (hwc->config_base << ARMV6_PMCR_EVT_COUNT1_SHIFT) |  in armv6pmu_enable_event()
224 		WARN_ONCE(1, "invalid counter number (%d)\n", idx);  in armv6pmu_enable_event()
229 	 * Mask out the current event and set the counter to count the event  in armv6pmu_enable_event()
243 	struct pmu_hw_events *cpuc = this_cpu_ptr(cpu_pmu->hw_events);  in armv6pmu_handle_irq()
259 	for (idx = 0; idx < cpu_pmu->num_events; ++idx) {  in armv6pmu_handle_irq()
260 		struct perf_event *event = cpuc->events[idx];  in armv6pmu_handle_irq()
269 		 * each counter has overflowed before we process it.  in armv6pmu_handle_irq()
274 		hwc = &event->hw;  in armv6pmu_handle_irq()
276 		perf_sample_data_init(&data, 0, hwc->last_period);  in armv6pmu_handle_irq()
281 			cpu_pmu->disable(event);  in armv6pmu_handle_irq()
318 	struct hw_perf_event *hwc = &event->hw;  in armv6pmu_get_event_idx()
319 	/* Always place a cycle counter into the cycle counter. */  in armv6pmu_get_event_idx()
320 	if (ARMV6_PERFCTR_CPU_CYCLES == hwc->config_base) {  in armv6pmu_get_event_idx()
321 		if (test_and_set_bit(ARMV6_CYCLE_COUNTER, cpuc->used_mask))  in armv6pmu_get_event_idx()
322 			return -EAGAIN;  in armv6pmu_get_event_idx()
327 		 * For anything other than a cycle counter, try and use  in armv6pmu_get_event_idx()
330 		if (!test_and_set_bit(ARMV6_COUNTER1, cpuc->used_mask))  in armv6pmu_get_event_idx()
333 		if (!test_and_set_bit(ARMV6_COUNTER0, cpuc->used_mask))  in armv6pmu_get_event_idx()
337 		return -EAGAIN;  in armv6pmu_get_event_idx()
344 	clear_bit(event->hw.idx, cpuc->used_mask);  in armv6pmu_clear_event_idx()
350 	struct hw_perf_event *hwc = &event->hw;  in armv6pmu_disable_event()
351 	int idx = hwc->idx;  in armv6pmu_disable_event()
363 		WARN_ONCE(1, "invalid counter number (%d)\n", idx);  in armv6pmu_disable_event()
368 	 * Mask out the current event and set the counter to count the number  in armv6pmu_disable_event()
386 	cpu_pmu->handle_irq	= armv6pmu_handle_irq;  in armv6pmu_init()
387 	cpu_pmu->enable		= armv6pmu_enable_event;  in armv6pmu_init()
388 	cpu_pmu->disable	= armv6pmu_disable_event;  in armv6pmu_init()
389 	cpu_pmu->read_counter	= armv6pmu_read_counter;  in armv6pmu_init()
390 	cpu_pmu->write_counter	= armv6pmu_write_counter;  in armv6pmu_init()
391 	cpu_pmu->get_event_idx	= armv6pmu_get_event_idx;  in armv6pmu_init()
392 	cpu_pmu->clear_event_idx = armv6pmu_clear_event_idx;  in armv6pmu_init()
393 	cpu_pmu->start		= armv6pmu_start;  in armv6pmu_init()
394 	cpu_pmu->stop		= armv6pmu_stop;  in armv6pmu_init()
395 	cpu_pmu->map_event	= armv6_map_event;  in armv6pmu_init()
396 	cpu_pmu->num_events	= 3;  in armv6pmu_init()
402 	cpu_pmu->name		= "armv6_1136";  in armv6_1136_pmu_init()
409 	cpu_pmu->name		= "armv6_1156";  in armv6_1156_pmu_init()
416 	cpu_pmu->name		= "armv6_1176";  in armv6_1176_pmu_init()
421 	{.compatible = "arm,arm1176-pmu",	.data = armv6_1176_pmu_init},
422 	{.compatible = "arm,arm1136-pmu",	.data = armv6_1136_pmu_init},
441 		.name	= "armv6-pmu",