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-rw-r--r--drivers/perf/apple_m1_cpu_pmu.c584
1 files changed, 584 insertions, 0 deletions
diff --git a/drivers/perf/apple_m1_cpu_pmu.c b/drivers/perf/apple_m1_cpu_pmu.c
new file mode 100644
index 000000000..979a7c2b4
--- /dev/null
+++ b/drivers/perf/apple_m1_cpu_pmu.c
@@ -0,0 +1,584 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * CPU PMU driver for the Apple M1 and derivatives
+ *
+ * Copyright (C) 2021 Google LLC
+ *
+ * Author: Marc Zyngier <maz@kernel.org>
+ *
+ * Most of the information used in this driver was provided by the
+ * Asahi Linux project. The rest was experimentally discovered.
+ */
+
+#include <linux/of.h>
+#include <linux/perf/arm_pmu.h>
+#include <linux/platform_device.h>
+
+#include <asm/apple_m1_pmu.h>
+#include <asm/irq_regs.h>
+#include <asm/perf_event.h>
+
+#define M1_PMU_NR_COUNTERS 10
+
+#define M1_PMU_CFG_EVENT GENMASK(7, 0)
+
+#define ANY_BUT_0_1 GENMASK(9, 2)
+#define ONLY_2_TO_7 GENMASK(7, 2)
+#define ONLY_2_4_6 (BIT(2) | BIT(4) | BIT(6))
+#define ONLY_5_6_7 (BIT(5) | BIT(6) | BIT(7))
+
+/*
+ * Description of the events we actually know about, as well as those with
+ * a specific counter affinity. Yes, this is a grand total of two known
+ * counters, and the rest is anybody's guess.
+ *
+ * Not all counters can count all events. Counters #0 and #1 are wired to
+ * count cycles and instructions respectively, and some events have
+ * bizarre mappings (every other counter, or even *one* counter). These
+ * restrictions equally apply to both P and E cores.
+ *
+ * It is worth noting that the PMUs attached to P and E cores are likely
+ * to be different because the underlying uarches are different. At the
+ * moment, we don't really need to distinguish between the two because we
+ * know next to nothing about the events themselves, and we already have
+ * per cpu-type PMU abstractions.
+ *
+ * If we eventually find out that the events are different across
+ * implementations, we'll have to introduce per cpu-type tables.
+ */
+enum m1_pmu_events {
+ M1_PMU_PERFCTR_UNKNOWN_01 = 0x01,
+ M1_PMU_PERFCTR_CPU_CYCLES = 0x02,
+ M1_PMU_PERFCTR_INSTRUCTIONS = 0x8c,
+ M1_PMU_PERFCTR_UNKNOWN_8d = 0x8d,
+ M1_PMU_PERFCTR_UNKNOWN_8e = 0x8e,
+ M1_PMU_PERFCTR_UNKNOWN_8f = 0x8f,
+ M1_PMU_PERFCTR_UNKNOWN_90 = 0x90,
+ M1_PMU_PERFCTR_UNKNOWN_93 = 0x93,
+ M1_PMU_PERFCTR_UNKNOWN_94 = 0x94,
+ M1_PMU_PERFCTR_UNKNOWN_95 = 0x95,
+ M1_PMU_PERFCTR_UNKNOWN_96 = 0x96,
+ M1_PMU_PERFCTR_UNKNOWN_97 = 0x97,
+ M1_PMU_PERFCTR_UNKNOWN_98 = 0x98,
+ M1_PMU_PERFCTR_UNKNOWN_99 = 0x99,
+ M1_PMU_PERFCTR_UNKNOWN_9a = 0x9a,
+ M1_PMU_PERFCTR_UNKNOWN_9b = 0x9b,
+ M1_PMU_PERFCTR_UNKNOWN_9c = 0x9c,
+ M1_PMU_PERFCTR_UNKNOWN_9f = 0x9f,
+ M1_PMU_PERFCTR_UNKNOWN_bf = 0xbf,
+ M1_PMU_PERFCTR_UNKNOWN_c0 = 0xc0,
+ M1_PMU_PERFCTR_UNKNOWN_c1 = 0xc1,
+ M1_PMU_PERFCTR_UNKNOWN_c4 = 0xc4,
+ M1_PMU_PERFCTR_UNKNOWN_c5 = 0xc5,
+ M1_PMU_PERFCTR_UNKNOWN_c6 = 0xc6,
+ M1_PMU_PERFCTR_UNKNOWN_c8 = 0xc8,
+ M1_PMU_PERFCTR_UNKNOWN_ca = 0xca,
+ M1_PMU_PERFCTR_UNKNOWN_cb = 0xcb,
+ M1_PMU_PERFCTR_UNKNOWN_f5 = 0xf5,
+ M1_PMU_PERFCTR_UNKNOWN_f6 = 0xf6,
+ M1_PMU_PERFCTR_UNKNOWN_f7 = 0xf7,
+ M1_PMU_PERFCTR_UNKNOWN_f8 = 0xf8,
+ M1_PMU_PERFCTR_UNKNOWN_fd = 0xfd,
+ M1_PMU_PERFCTR_LAST = M1_PMU_CFG_EVENT,
+
+ /*
+ * From this point onwards, these are not actual HW events,
+ * but attributes that get stored in hw->config_base.
+ */
+ M1_PMU_CFG_COUNT_USER = BIT(8),
+ M1_PMU_CFG_COUNT_KERNEL = BIT(9),
+};
+
+/*
+ * Per-event affinity table. Most events can be installed on counter
+ * 2-9, but there are a number of exceptions. Note that this table
+ * has been created experimentally, and I wouldn't be surprised if more
+ * counters had strange affinities.
+ */
+static const u16 m1_pmu_event_affinity[M1_PMU_PERFCTR_LAST + 1] = {
+ [0 ... M1_PMU_PERFCTR_LAST] = ANY_BUT_0_1,
+ [M1_PMU_PERFCTR_UNKNOWN_01] = BIT(7),
+ [M1_PMU_PERFCTR_CPU_CYCLES] = ANY_BUT_0_1 | BIT(0),
+ [M1_PMU_PERFCTR_INSTRUCTIONS] = BIT(7) | BIT(1),
+ [M1_PMU_PERFCTR_UNKNOWN_8d] = ONLY_5_6_7,
+ [M1_PMU_PERFCTR_UNKNOWN_8e] = ONLY_5_6_7,
+ [M1_PMU_PERFCTR_UNKNOWN_8f] = ONLY_5_6_7,
+ [M1_PMU_PERFCTR_UNKNOWN_90] = ONLY_5_6_7,
+ [M1_PMU_PERFCTR_UNKNOWN_93] = ONLY_5_6_7,
+ [M1_PMU_PERFCTR_UNKNOWN_94] = ONLY_5_6_7,
+ [M1_PMU_PERFCTR_UNKNOWN_95] = ONLY_5_6_7,
+ [M1_PMU_PERFCTR_UNKNOWN_96] = ONLY_5_6_7,
+ [M1_PMU_PERFCTR_UNKNOWN_97] = BIT(7),
+ [M1_PMU_PERFCTR_UNKNOWN_98] = ONLY_5_6_7,
+ [M1_PMU_PERFCTR_UNKNOWN_99] = ONLY_5_6_7,
+ [M1_PMU_PERFCTR_UNKNOWN_9a] = BIT(7),
+ [M1_PMU_PERFCTR_UNKNOWN_9b] = ONLY_5_6_7,
+ [M1_PMU_PERFCTR_UNKNOWN_9c] = ONLY_5_6_7,
+ [M1_PMU_PERFCTR_UNKNOWN_9f] = BIT(7),
+ [M1_PMU_PERFCTR_UNKNOWN_bf] = ONLY_5_6_7,
+ [M1_PMU_PERFCTR_UNKNOWN_c0] = ONLY_5_6_7,
+ [M1_PMU_PERFCTR_UNKNOWN_c1] = ONLY_5_6_7,
+ [M1_PMU_PERFCTR_UNKNOWN_c4] = ONLY_5_6_7,
+ [M1_PMU_PERFCTR_UNKNOWN_c5] = ONLY_5_6_7,
+ [M1_PMU_PERFCTR_UNKNOWN_c6] = ONLY_5_6_7,
+ [M1_PMU_PERFCTR_UNKNOWN_c8] = ONLY_5_6_7,
+ [M1_PMU_PERFCTR_UNKNOWN_ca] = ONLY_5_6_7,
+ [M1_PMU_PERFCTR_UNKNOWN_cb] = ONLY_5_6_7,
+ [M1_PMU_PERFCTR_UNKNOWN_f5] = ONLY_2_4_6,
+ [M1_PMU_PERFCTR_UNKNOWN_f6] = ONLY_2_4_6,
+ [M1_PMU_PERFCTR_UNKNOWN_f7] = ONLY_2_4_6,
+ [M1_PMU_PERFCTR_UNKNOWN_f8] = ONLY_2_TO_7,
+ [M1_PMU_PERFCTR_UNKNOWN_fd] = ONLY_2_4_6,
+};
+
+static const unsigned m1_pmu_perf_map[PERF_COUNT_HW_MAX] = {
+ PERF_MAP_ALL_UNSUPPORTED,
+ [PERF_COUNT_HW_CPU_CYCLES] = M1_PMU_PERFCTR_CPU_CYCLES,
+ [PERF_COUNT_HW_INSTRUCTIONS] = M1_PMU_PERFCTR_INSTRUCTIONS,
+ /* No idea about the rest yet */
+};
+
+/* sysfs definitions */
+static ssize_t m1_pmu_events_sysfs_show(struct device *dev,
+ struct device_attribute *attr,
+ char *page)
+{
+ struct perf_pmu_events_attr *pmu_attr;
+
+ pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
+
+ return sprintf(page, "event=0x%04llx\n", pmu_attr->id);
+}
+
+#define M1_PMU_EVENT_ATTR(name, config) \
+ PMU_EVENT_ATTR_ID(name, m1_pmu_events_sysfs_show, config)
+
+static struct attribute *m1_pmu_event_attrs[] = {
+ M1_PMU_EVENT_ATTR(cycles, M1_PMU_PERFCTR_CPU_CYCLES),
+ M1_PMU_EVENT_ATTR(instructions, M1_PMU_PERFCTR_INSTRUCTIONS),
+ NULL,
+};
+
+static const struct attribute_group m1_pmu_events_attr_group = {
+ .name = "events",
+ .attrs = m1_pmu_event_attrs,
+};
+
+PMU_FORMAT_ATTR(event, "config:0-7");
+
+static struct attribute *m1_pmu_format_attrs[] = {
+ &format_attr_event.attr,
+ NULL,
+};
+
+static const struct attribute_group m1_pmu_format_attr_group = {
+ .name = "format",
+ .attrs = m1_pmu_format_attrs,
+};
+
+/* Low level accessors. No synchronisation. */
+#define PMU_READ_COUNTER(_idx) \
+ case _idx: return read_sysreg_s(SYS_IMP_APL_PMC## _idx ##_EL1)
+
+#define PMU_WRITE_COUNTER(_val, _idx) \
+ case _idx: \
+ write_sysreg_s(_val, SYS_IMP_APL_PMC## _idx ##_EL1); \
+ return
+
+static u64 m1_pmu_read_hw_counter(unsigned int index)
+{
+ switch (index) {
+ PMU_READ_COUNTER(0);
+ PMU_READ_COUNTER(1);
+ PMU_READ_COUNTER(2);
+ PMU_READ_COUNTER(3);
+ PMU_READ_COUNTER(4);
+ PMU_READ_COUNTER(5);
+ PMU_READ_COUNTER(6);
+ PMU_READ_COUNTER(7);
+ PMU_READ_COUNTER(8);
+ PMU_READ_COUNTER(9);
+ }
+
+ BUG();
+}
+
+static void m1_pmu_write_hw_counter(u64 val, unsigned int index)
+{
+ switch (index) {
+ PMU_WRITE_COUNTER(val, 0);
+ PMU_WRITE_COUNTER(val, 1);
+ PMU_WRITE_COUNTER(val, 2);
+ PMU_WRITE_COUNTER(val, 3);
+ PMU_WRITE_COUNTER(val, 4);
+ PMU_WRITE_COUNTER(val, 5);
+ PMU_WRITE_COUNTER(val, 6);
+ PMU_WRITE_COUNTER(val, 7);
+ PMU_WRITE_COUNTER(val, 8);
+ PMU_WRITE_COUNTER(val, 9);
+ }
+
+ BUG();
+}
+
+#define get_bit_offset(index, mask) (__ffs(mask) + (index))
+
+static void __m1_pmu_enable_counter(unsigned int index, bool en)
+{
+ u64 val, bit;
+
+ switch (index) {
+ case 0 ... 7:
+ bit = BIT(get_bit_offset(index, PMCR0_CNT_ENABLE_0_7));
+ break;
+ case 8 ... 9:
+ bit = BIT(get_bit_offset(index - 8, PMCR0_CNT_ENABLE_8_9));
+ break;
+ default:
+ BUG();
+ }
+
+ val = read_sysreg_s(SYS_IMP_APL_PMCR0_EL1);
+
+ if (en)
+ val |= bit;
+ else
+ val &= ~bit;
+
+ write_sysreg_s(val, SYS_IMP_APL_PMCR0_EL1);
+}
+
+static void m1_pmu_enable_counter(unsigned int index)
+{
+ __m1_pmu_enable_counter(index, true);
+}
+
+static void m1_pmu_disable_counter(unsigned int index)
+{
+ __m1_pmu_enable_counter(index, false);
+}
+
+static void __m1_pmu_enable_counter_interrupt(unsigned int index, bool en)
+{
+ u64 val, bit;
+
+ switch (index) {
+ case 0 ... 7:
+ bit = BIT(get_bit_offset(index, PMCR0_PMI_ENABLE_0_7));
+ break;
+ case 8 ... 9:
+ bit = BIT(get_bit_offset(index - 8, PMCR0_PMI_ENABLE_8_9));
+ break;
+ default:
+ BUG();
+ }
+
+ val = read_sysreg_s(SYS_IMP_APL_PMCR0_EL1);
+
+ if (en)
+ val |= bit;
+ else
+ val &= ~bit;
+
+ write_sysreg_s(val, SYS_IMP_APL_PMCR0_EL1);
+}
+
+static void m1_pmu_enable_counter_interrupt(unsigned int index)
+{
+ __m1_pmu_enable_counter_interrupt(index, true);
+}
+
+static void m1_pmu_disable_counter_interrupt(unsigned int index)
+{
+ __m1_pmu_enable_counter_interrupt(index, false);
+}
+
+static void m1_pmu_configure_counter(unsigned int index, u8 event,
+ bool user, bool kernel)
+{
+ u64 val, user_bit, kernel_bit;
+ int shift;
+
+ switch (index) {
+ case 0 ... 7:
+ user_bit = BIT(get_bit_offset(index, PMCR1_COUNT_A64_EL0_0_7));
+ kernel_bit = BIT(get_bit_offset(index, PMCR1_COUNT_A64_EL1_0_7));
+ break;
+ case 8 ... 9:
+ user_bit = BIT(get_bit_offset(index - 8, PMCR1_COUNT_A64_EL0_8_9));
+ kernel_bit = BIT(get_bit_offset(index - 8, PMCR1_COUNT_A64_EL1_8_9));
+ break;
+ default:
+ BUG();
+ }
+
+ val = read_sysreg_s(SYS_IMP_APL_PMCR1_EL1);
+
+ if (user)
+ val |= user_bit;
+ else
+ val &= ~user_bit;
+
+ if (kernel)
+ val |= kernel_bit;
+ else
+ val &= ~kernel_bit;
+
+ write_sysreg_s(val, SYS_IMP_APL_PMCR1_EL1);
+
+ /*
+ * Counters 0 and 1 have fixed events. For anything else,
+ * place the event at the expected location in the relevant
+ * register (PMESR0 holds the event configuration for counters
+ * 2-5, resp. PMESR1 for counters 6-9).
+ */
+ switch (index) {
+ case 0 ... 1:
+ break;
+ case 2 ... 5:
+ shift = (index - 2) * 8;
+ val = read_sysreg_s(SYS_IMP_APL_PMESR0_EL1);
+ val &= ~((u64)0xff << shift);
+ val |= (u64)event << shift;
+ write_sysreg_s(val, SYS_IMP_APL_PMESR0_EL1);
+ break;
+ case 6 ... 9:
+ shift = (index - 6) * 8;
+ val = read_sysreg_s(SYS_IMP_APL_PMESR1_EL1);
+ val &= ~((u64)0xff << shift);
+ val |= (u64)event << shift;
+ write_sysreg_s(val, SYS_IMP_APL_PMESR1_EL1);
+ break;
+ }
+}
+
+/* arm_pmu backend */
+static void m1_pmu_enable_event(struct perf_event *event)
+{
+ bool user, kernel;
+ u8 evt;
+
+ evt = event->hw.config_base & M1_PMU_CFG_EVENT;
+ user = event->hw.config_base & M1_PMU_CFG_COUNT_USER;
+ kernel = event->hw.config_base & M1_PMU_CFG_COUNT_KERNEL;
+
+ m1_pmu_disable_counter_interrupt(event->hw.idx);
+ m1_pmu_disable_counter(event->hw.idx);
+ isb();
+
+ m1_pmu_configure_counter(event->hw.idx, evt, user, kernel);
+ m1_pmu_enable_counter(event->hw.idx);
+ m1_pmu_enable_counter_interrupt(event->hw.idx);
+ isb();
+}
+
+static void m1_pmu_disable_event(struct perf_event *event)
+{
+ m1_pmu_disable_counter_interrupt(event->hw.idx);
+ m1_pmu_disable_counter(event->hw.idx);
+ isb();
+}
+
+static irqreturn_t m1_pmu_handle_irq(struct arm_pmu *cpu_pmu)
+{
+ struct pmu_hw_events *cpuc = this_cpu_ptr(cpu_pmu->hw_events);
+ struct pt_regs *regs;
+ u64 overflow, state;
+ int idx;
+
+ overflow = read_sysreg_s(SYS_IMP_APL_PMSR_EL1);
+ if (!overflow) {
+ /* Spurious interrupt? */
+ state = read_sysreg_s(SYS_IMP_APL_PMCR0_EL1);
+ state &= ~PMCR0_IACT;
+ write_sysreg_s(state, SYS_IMP_APL_PMCR0_EL1);
+ isb();
+ return IRQ_NONE;
+ }
+
+ cpu_pmu->stop(cpu_pmu);
+
+ regs = get_irq_regs();
+
+ for (idx = 0; idx < cpu_pmu->num_events; idx++) {
+ struct perf_event *event = cpuc->events[idx];
+ struct perf_sample_data data;
+
+ if (!event)
+ continue;
+
+ armpmu_event_update(event);
+ perf_sample_data_init(&data, 0, event->hw.last_period);
+ if (!armpmu_event_set_period(event))
+ continue;
+
+ if (perf_event_overflow(event, &data, regs))
+ m1_pmu_disable_event(event);
+ }
+
+ cpu_pmu->start(cpu_pmu);
+
+ return IRQ_HANDLED;
+}
+
+static u64 m1_pmu_read_counter(struct perf_event *event)
+{
+ return m1_pmu_read_hw_counter(event->hw.idx);
+}
+
+static void m1_pmu_write_counter(struct perf_event *event, u64 value)
+{
+ m1_pmu_write_hw_counter(value, event->hw.idx);
+ isb();
+}
+
+static int m1_pmu_get_event_idx(struct pmu_hw_events *cpuc,
+ struct perf_event *event)
+{
+ unsigned long evtype = event->hw.config_base & M1_PMU_CFG_EVENT;
+ unsigned long affinity = m1_pmu_event_affinity[evtype];
+ int idx;
+
+ /*
+ * Place the event on the first free counter that can count
+ * this event.
+ *
+ * We could do a better job if we had a view of all the events
+ * counting on the PMU at any given time, and by placing the
+ * most constraining events first.
+ */
+ for_each_set_bit(idx, &affinity, M1_PMU_NR_COUNTERS) {
+ if (!test_and_set_bit(idx, cpuc->used_mask))
+ return idx;
+ }
+
+ return -EAGAIN;
+}
+
+static void m1_pmu_clear_event_idx(struct pmu_hw_events *cpuc,
+ struct perf_event *event)
+{
+ clear_bit(event->hw.idx, cpuc->used_mask);
+}
+
+static void __m1_pmu_set_mode(u8 mode)
+{
+ u64 val;
+
+ val = read_sysreg_s(SYS_IMP_APL_PMCR0_EL1);
+ val &= ~(PMCR0_IMODE | PMCR0_IACT);
+ val |= FIELD_PREP(PMCR0_IMODE, mode);
+ write_sysreg_s(val, SYS_IMP_APL_PMCR0_EL1);
+ isb();
+}
+
+static void m1_pmu_start(struct arm_pmu *cpu_pmu)
+{
+ __m1_pmu_set_mode(PMCR0_IMODE_FIQ);
+}
+
+static void m1_pmu_stop(struct arm_pmu *cpu_pmu)
+{
+ __m1_pmu_set_mode(PMCR0_IMODE_OFF);
+}
+
+static int m1_pmu_map_event(struct perf_event *event)
+{
+ /*
+ * Although the counters are 48bit wide, bit 47 is what
+ * triggers the overflow interrupt. Advertise the counters
+ * being 47bit wide to mimick the behaviour of the ARM PMU.
+ */
+ event->hw.flags |= ARMPMU_EVT_47BIT;
+ return armpmu_map_event(event, &m1_pmu_perf_map, NULL, M1_PMU_CFG_EVENT);
+}
+
+static void m1_pmu_reset(void *info)
+{
+ int i;
+
+ __m1_pmu_set_mode(PMCR0_IMODE_OFF);
+
+ for (i = 0; i < M1_PMU_NR_COUNTERS; i++) {
+ m1_pmu_disable_counter(i);
+ m1_pmu_disable_counter_interrupt(i);
+ m1_pmu_write_hw_counter(0, i);
+ }
+
+ isb();
+}
+
+static int m1_pmu_set_event_filter(struct hw_perf_event *event,
+ struct perf_event_attr *attr)
+{
+ unsigned long config_base = 0;
+
+ if (!attr->exclude_guest)
+ return -EINVAL;
+ if (!attr->exclude_kernel)
+ config_base |= M1_PMU_CFG_COUNT_KERNEL;
+ if (!attr->exclude_user)
+ config_base |= M1_PMU_CFG_COUNT_USER;
+
+ event->config_base = config_base;
+
+ return 0;
+}
+
+static int m1_pmu_init(struct arm_pmu *cpu_pmu)
+{
+ cpu_pmu->handle_irq = m1_pmu_handle_irq;
+ cpu_pmu->enable = m1_pmu_enable_event;
+ cpu_pmu->disable = m1_pmu_disable_event;
+ cpu_pmu->read_counter = m1_pmu_read_counter;
+ cpu_pmu->write_counter = m1_pmu_write_counter;
+ cpu_pmu->get_event_idx = m1_pmu_get_event_idx;
+ cpu_pmu->clear_event_idx = m1_pmu_clear_event_idx;
+ cpu_pmu->start = m1_pmu_start;
+ cpu_pmu->stop = m1_pmu_stop;
+ cpu_pmu->map_event = m1_pmu_map_event;
+ cpu_pmu->reset = m1_pmu_reset;
+ cpu_pmu->set_event_filter = m1_pmu_set_event_filter;
+
+ cpu_pmu->num_events = M1_PMU_NR_COUNTERS;
+ cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_EVENTS] = &m1_pmu_events_attr_group;
+ cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_FORMATS] = &m1_pmu_format_attr_group;
+ return 0;
+}
+
+/* Device driver gunk */
+static int m1_pmu_ice_init(struct arm_pmu *cpu_pmu)
+{
+ cpu_pmu->name = "apple_icestorm_pmu";
+ return m1_pmu_init(cpu_pmu);
+}
+
+static int m1_pmu_fire_init(struct arm_pmu *cpu_pmu)
+{
+ cpu_pmu->name = "apple_firestorm_pmu";
+ return m1_pmu_init(cpu_pmu);
+}
+
+static const struct of_device_id m1_pmu_of_device_ids[] = {
+ { .compatible = "apple,icestorm-pmu", .data = m1_pmu_ice_init, },
+ { .compatible = "apple,firestorm-pmu", .data = m1_pmu_fire_init, },
+ { },
+};
+MODULE_DEVICE_TABLE(of, m1_pmu_of_device_ids);
+
+static int m1_pmu_device_probe(struct platform_device *pdev)
+{
+ return arm_pmu_device_probe(pdev, m1_pmu_of_device_ids, NULL);
+}
+
+static struct platform_driver m1_pmu_driver = {
+ .driver = {
+ .name = "apple-m1-cpu-pmu",
+ .of_match_table = m1_pmu_of_device_ids,
+ .suppress_bind_attrs = true,
+ },
+ .probe = m1_pmu_device_probe,
+};
+
+module_platform_driver(m1_pmu_driver);
+MODULE_LICENSE("GPL v2");