--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+// Copyright 2023 NXP
+
+#include <linux/bitfield.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/perf_event.h>
+
+/* Performance monitor configuration */
+#define PMCFG1 0x00
+#define PMCFG1_RD_TRANS_FILT_EN BIT(31)
+#define PMCFG1_WR_TRANS_FILT_EN BIT(30)
+#define PMCFG1_RD_BT_FILT_EN BIT(29)
+#define PMCFG1_ID_MASK GENMASK(17, 0)
+
+#define PMCFG2 0x04
+#define PMCFG2_ID GENMASK(17, 0)
+
+/* Global control register affects all counters and takes priority over local control registers */
+#define PMGC0 0x40
+/* Global control register bits */
+#define PMGC0_FAC BIT(31)
+#define PMGC0_PMIE BIT(30)
+#define PMGC0_FCECE BIT(29)
+
+/*
+ * 64bit counter0 exclusively dedicated to counting cycles
+ * 32bit counters monitor counter-specific events in addition to counting reference events
+ */
+#define PMLCA(n) (0x40 + 0x10 + (0x10 * n))
+#define PMLCB(n) (0x40 + 0x14 + (0x10 * n))
+#define PMC(n) (0x40 + 0x18 + (0x10 * n))
+/* Local control register bits */
+#define PMLCA_FC BIT(31)
+#define PMLCA_CE BIT(26)
+#define PMLCA_EVENT GENMASK(22, 16)
+
+#define NUM_COUNTERS 11
+#define CYCLES_COUNTER 0
+
+#define to_ddr_pmu(p) container_of(p, struct ddr_pmu, pmu)
+
+#define DDR_PERF_DEV_NAME "imx9_ddr"
+#define DDR_CPUHP_CB_NAME DDR_PERF_DEV_NAME "_perf_pmu"
+
+static DEFINE_IDA(ddr_ida);
+
+struct imx_ddr_devtype_data {
+ const char *identifier; /* system PMU identifier for userspace */
+};
+
+struct ddr_pmu {
+ struct pmu pmu;
+ void __iomem *base;
+ unsigned int cpu;
+ struct hlist_node node;
+ struct device *dev;
+ struct perf_event *events[NUM_COUNTERS];
+ int active_events;
+ enum cpuhp_state cpuhp_state;
+ const struct imx_ddr_devtype_data *devtype_data;
+ int irq;
+ int id;
+};
+
+static const struct imx_ddr_devtype_data imx93_devtype_data = {
+ .identifier = "imx93",
+};
+
+static const struct of_device_id imx_ddr_pmu_dt_ids[] = {
+ {.compatible = "fsl,imx93-ddr-pmu", .data = &imx93_devtype_data},
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx_ddr_pmu_dt_ids);
+
+static ssize_t ddr_perf_identifier_show(struct device *dev,
+ struct device_attribute *attr,
+ char *page)
+{
+ struct ddr_pmu *pmu = dev_get_drvdata(dev);
+
+ return sysfs_emit(page, "%s\n", pmu->devtype_data->identifier);
+}
+
+static struct device_attribute ddr_perf_identifier_attr =
+ __ATTR(identifier, 0444, ddr_perf_identifier_show, NULL);
+
+static struct attribute *ddr_perf_identifier_attrs[] = {
+ &ddr_perf_identifier_attr.attr,
+ NULL,
+};
+
+static struct attribute_group ddr_perf_identifier_attr_group = {
+ .attrs = ddr_perf_identifier_attrs,
+};
+
+static ssize_t ddr_perf_cpumask_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ddr_pmu *pmu = dev_get_drvdata(dev);
+
+ return cpumap_print_to_pagebuf(true, buf, cpumask_of(pmu->cpu));
+}
+
+static struct device_attribute ddr_perf_cpumask_attr =
+ __ATTR(cpumask, 0444, ddr_perf_cpumask_show, NULL);
+
+static struct attribute *ddr_perf_cpumask_attrs[] = {
+ &ddr_perf_cpumask_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group ddr_perf_cpumask_attr_group = {
+ .attrs = ddr_perf_cpumask_attrs,
+};
+
+static ssize_t ddr_pmu_event_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 sysfs_emit(page, "event=0x%02llx\n", pmu_attr->id);
+}
+
+#define IMX9_DDR_PMU_EVENT_ATTR(_name, _id) \
+ (&((struct perf_pmu_events_attr[]) { \
+ { .attr = __ATTR(_name, 0444, ddr_pmu_event_show, NULL),\
+ .id = _id, } \
+ })[0].attr.attr)
+
+static struct attribute *ddr_perf_events_attrs[] = {
+ /* counter0 cycles event */
+ IMX9_DDR_PMU_EVENT_ATTR(cycles, 0),
+
+ /* reference events for all normal counters, need assert DEBUG19[21] bit */
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_ddrc1_rmw_for_ecc, 12),
+ IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_rreorder, 13),
+ IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_wreorder, 14),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_0, 15),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_1, 16),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_2, 17),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_3, 18),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_4, 19),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_5, 22),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_6, 23),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_7, 24),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_8, 25),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_9, 26),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_10, 27),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_11, 28),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_12, 31),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_13, 59),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_15, 61),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_29, 63),
+
+ /* counter1 specific events */
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_0, 64),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_1, 65),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_2, 66),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_3, 67),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_4, 68),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_5, 69),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_6, 70),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_7, 71),
+
+ /* counter2 specific events */
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_0, 64),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_1, 65),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_2, 66),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_3, 67),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_4, 68),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_5, 69),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_6, 70),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_7, 71),
+ IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_empty, 72),
+ IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_trans_filt, 73),
+
+ /* counter3 specific events */
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_0, 64),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_1, 65),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_2, 66),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_3, 67),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_4, 68),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_5, 69),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_6, 70),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_7, 71),
+ IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_full, 72),
+ IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_wr_trans_filt, 73),
+
+ /* counter4 specific events */
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_0, 64),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_1, 65),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_2, 66),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_3, 67),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_4, 68),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_5, 69),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_6, 70),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_7, 71),
+ IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_ld_rdq2_rmw, 72),
+ IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_beat_filt, 73),
+
+ /* counter5 specific events */
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_0, 64),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_1, 65),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_2, 66),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_3, 67),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_4, 68),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_5, 69),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_6, 70),
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_7, 71),
+ IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_ld_rdq1, 72),
+
+ /* counter6 specific events */
+ IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_end_0, 64),
+ IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_ld_rdq2, 72),
+
+ /* counter7 specific events */
+ IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_1_2_full, 64),
+ IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_ld_wrq0, 65),
+
+ /* counter8 specific events */
+ IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_bias_switched, 64),
+ IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_1_4_full, 65),
+
+ /* counter9 specific events */
+ IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_ld_wrq1, 65),
+ IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_3_4_full, 66),
+
+ /* counter10 specific events */
+ IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_misc_mrk, 65),
+ IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_ld_rdq0, 66),
+ NULL,
+};
+
+static const struct attribute_group ddr_perf_events_attr_group = {
+ .name = "events",
+ .attrs = ddr_perf_events_attrs,
+};
+
+PMU_FORMAT_ATTR(event, "config:0-7");
+PMU_FORMAT_ATTR(counter, "config:8-15");
+PMU_FORMAT_ATTR(axi_id, "config1:0-17");
+PMU_FORMAT_ATTR(axi_mask, "config2:0-17");
+
+static struct attribute *ddr_perf_format_attrs[] = {
+ &format_attr_event.attr,
+ &format_attr_counter.attr,
+ &format_attr_axi_id.attr,
+ &format_attr_axi_mask.attr,
+ NULL,
+};
+
+static const struct attribute_group ddr_perf_format_attr_group = {
+ .name = "format",
+ .attrs = ddr_perf_format_attrs,
+};
+
+static const struct attribute_group *attr_groups[] = {
+ &ddr_perf_identifier_attr_group,
+ &ddr_perf_cpumask_attr_group,
+ &ddr_perf_events_attr_group,
+ &ddr_perf_format_attr_group,
+ NULL,
+};
+
+static void ddr_perf_clear_counter(struct ddr_pmu *pmu, int counter)
+{
+ if (counter == CYCLES_COUNTER) {
+ writel(0, pmu->base + PMC(counter) + 0x4);
+ writel(0, pmu->base + PMC(counter));
+ } else {
+ writel(0, pmu->base + PMC(counter));
+ }
+}
+
+static u64 ddr_perf_read_counter(struct ddr_pmu *pmu, int counter)
+{
+ u32 val_lower, val_upper;
+ u64 val;
+
+ if (counter != CYCLES_COUNTER) {
+ val = readl_relaxed(pmu->base + PMC(counter));
+ goto out;
+ }
+
+ /* special handling for reading 64bit cycle counter */
+ do {
+ val_upper = readl_relaxed(pmu->base + PMC(counter) + 0x4);
+ val_lower = readl_relaxed(pmu->base + PMC(counter));
+ } while (val_upper != readl_relaxed(pmu->base + PMC(counter) + 0x4));
+
+ val = val_upper;
+ val = (val << 32);
+ val |= val_lower;
+out:
+ return val;
+}
+
+static void ddr_perf_counter_global_config(struct ddr_pmu *pmu, bool enable)
+{
+ u32 ctrl;
+
+ ctrl = readl_relaxed(pmu->base + PMGC0);
+
+ if (enable) {
+ /*
+ * The performance monitor must be reset before event counting
+ * sequences. The performance monitor can be reset by first freezing
+ * one or more counters and then clearing the freeze condition to
+ * allow the counters to count according to the settings in the
+ * performance monitor registers. Counters can be frozen individually
+ * by setting PMLCAn[FC] bits, or simultaneously by setting PMGC0[FAC].
+ * Simply clearing these freeze bits will then allow the performance
+ * monitor to begin counting based on the register settings.
+ */
+ ctrl |= PMGC0_FAC;
+ writel(ctrl, pmu->base + PMGC0);
+
+ /*
+ * Freeze all counters disabled, interrupt enabled, and freeze
+ * counters on condition enabled.
+ */
+ ctrl &= ~PMGC0_FAC;
+ ctrl |= PMGC0_PMIE | PMGC0_FCECE;
+ writel(ctrl, pmu->base + PMGC0);
+ } else {
+ ctrl |= PMGC0_FAC;
+ ctrl &= ~(PMGC0_PMIE | PMGC0_FCECE);
+ writel(ctrl, pmu->base + PMGC0);
+ }
+}
+
+static void ddr_perf_counter_local_config(struct ddr_pmu *pmu, int config,
+ int counter, bool enable)
+{
+ u32 ctrl_a;
+
+ ctrl_a = readl_relaxed(pmu->base + PMLCA(counter));
+
+ if (enable) {
+ ctrl_a |= PMLCA_FC;
+ writel(ctrl_a, pmu->base + PMLCA(counter));
+
+ ddr_perf_clear_counter(pmu, counter);
+
+ /* Freeze counter disabled, condition enabled, and program event.*/
+ ctrl_a &= ~PMLCA_FC;
+ ctrl_a |= PMLCA_CE;
+ ctrl_a &= ~FIELD_PREP(PMLCA_EVENT, 0x7F);
+ ctrl_a |= FIELD_PREP(PMLCA_EVENT, (config & 0x000000FF));
+ writel(ctrl_a, pmu->base + PMLCA(counter));
+ } else {
+ /* Freeze counter. */
+ ctrl_a |= PMLCA_FC;
+ writel(ctrl_a, pmu->base + PMLCA(counter));
+ }
+}
+
+static void ddr_perf_monitor_config(struct ddr_pmu *pmu, int cfg, int cfg1, int cfg2)
+{
+ u32 pmcfg1, pmcfg2;
+ int event, counter;
+
+ event = cfg & 0x000000FF;
+ counter = (cfg & 0x0000FF00) >> 8;
+
+ pmcfg1 = readl_relaxed(pmu->base + PMCFG1);
+
+ if (counter == 2 && event == 73)
+ pmcfg1 |= PMCFG1_RD_TRANS_FILT_EN;
+ else if (counter == 2 && event != 73)
+ pmcfg1 &= ~PMCFG1_RD_TRANS_FILT_EN;
+
+ if (counter == 3 && event == 73)
+ pmcfg1 |= PMCFG1_WR_TRANS_FILT_EN;
+ else if (counter == 3 && event != 73)
+ pmcfg1 &= ~PMCFG1_WR_TRANS_FILT_EN;
+
+ if (counter == 4 && event == 73)
+ pmcfg1 |= PMCFG1_RD_BT_FILT_EN;
+ else if (counter == 4 && event != 73)
+ pmcfg1 &= ~PMCFG1_RD_BT_FILT_EN;
+
+ pmcfg1 &= ~FIELD_PREP(PMCFG1_ID_MASK, 0x3FFFF);
+ pmcfg1 |= FIELD_PREP(PMCFG1_ID_MASK, cfg2);
+ writel(pmcfg1, pmu->base + PMCFG1);
+
+ pmcfg2 = readl_relaxed(pmu->base + PMCFG2);
+ pmcfg2 &= ~FIELD_PREP(PMCFG2_ID, 0x3FFFF);
+ pmcfg2 |= FIELD_PREP(PMCFG2_ID, cfg1);
+ writel(pmcfg2, pmu->base + PMCFG2);
+}
+
+static void ddr_perf_event_update(struct perf_event *event)
+{
+ struct ddr_pmu *pmu = to_ddr_pmu(event->pmu);
+ struct hw_perf_event *hwc = &event->hw;
+ int counter = hwc->idx;
+ u64 new_raw_count;
+
+ new_raw_count = ddr_perf_read_counter(pmu, counter);
+ local64_add(new_raw_count, &event->count);
+
+ /* clear counter's value every time */
+ ddr_perf_clear_counter(pmu, counter);
+}
+
+static int ddr_perf_event_init(struct perf_event *event)
+{
+ struct ddr_pmu *pmu = to_ddr_pmu(event->pmu);
+ struct hw_perf_event *hwc = &event->hw;
+ struct perf_event *sibling;
+
+ if (event->attr.type != event->pmu->type)
+ return -ENOENT;
+
+ if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK)
+ return -EOPNOTSUPP;
+
+ if (event->cpu < 0) {
+ dev_warn(pmu->dev, "Can't provide per-task data!\n");
+ return -EOPNOTSUPP;
+ }
+
+ /*
+ * We must NOT create groups containing mixed PMUs, although software
+ * events are acceptable (for example to create a CCN group
+ * periodically read when a hrtimer aka cpu-clock leader triggers).
+ */
+ if (event->group_leader->pmu != event->pmu &&
+ !is_software_event(event->group_leader))
+ return -EINVAL;
+
+ for_each_sibling_event(sibling, event->group_leader) {
+ if (sibling->pmu != event->pmu &&
+ !is_software_event(sibling))
+ return -EINVAL;
+ }
+
+ event->cpu = pmu->cpu;
+ hwc->idx = -1;
+
+ return 0;
+}
+
+static void ddr_perf_event_start(struct perf_event *event, int flags)
+{
+ struct ddr_pmu *pmu = to_ddr_pmu(event->pmu);
+ struct hw_perf_event *hwc = &event->hw;
+ int counter = hwc->idx;
+
+ local64_set(&hwc->prev_count, 0);
+
+ ddr_perf_counter_local_config(pmu, event->attr.config, counter, true);
+ hwc->state = 0;
+}
+
+static int ddr_perf_event_add(struct perf_event *event, int flags)
+{
+ struct ddr_pmu *pmu = to_ddr_pmu(event->pmu);
+ struct hw_perf_event *hwc = &event->hw;
+ int cfg = event->attr.config;
+ int cfg1 = event->attr.config1;
+ int cfg2 = event->attr.config2;
+ int counter;
+
+ counter = (cfg & 0x0000FF00) >> 8;
+
+ pmu->events[counter] = event;
+ pmu->active_events++;
+ hwc->idx = counter;
+ hwc->state |= PERF_HES_STOPPED;
+
+ if (flags & PERF_EF_START)
+ ddr_perf_event_start(event, flags);
+
+ /* read trans, write trans, read beat */
+ ddr_perf_monitor_config(pmu, cfg, cfg1, cfg2);
+
+ return 0;
+}
+
+static void ddr_perf_event_stop(struct perf_event *event, int flags)
+{
+ struct ddr_pmu *pmu = to_ddr_pmu(event->pmu);
+ struct hw_perf_event *hwc = &event->hw;
+ int counter = hwc->idx;
+
+ ddr_perf_counter_local_config(pmu, event->attr.config, counter, false);
+ ddr_perf_event_update(event);
+
+ hwc->state |= PERF_HES_STOPPED;
+}
+
+static void ddr_perf_event_del(struct perf_event *event, int flags)
+{
+ struct ddr_pmu *pmu = to_ddr_pmu(event->pmu);
+ struct hw_perf_event *hwc = &event->hw;
+
+ ddr_perf_event_stop(event, PERF_EF_UPDATE);
+
+ pmu->active_events--;
+ hwc->idx = -1;
+}
+
+static void ddr_perf_pmu_enable(struct pmu *pmu)
+{
+ struct ddr_pmu *ddr_pmu = to_ddr_pmu(pmu);
+
+ ddr_perf_counter_global_config(ddr_pmu, true);
+}
+
+static void ddr_perf_pmu_disable(struct pmu *pmu)
+{
+ struct ddr_pmu *ddr_pmu = to_ddr_pmu(pmu);
+
+ ddr_perf_counter_global_config(ddr_pmu, false);
+}
+
+static void ddr_perf_init(struct ddr_pmu *pmu, void __iomem *base,
+ struct device *dev)
+{
+ *pmu = (struct ddr_pmu) {
+ .pmu = (struct pmu) {
+ .module = THIS_MODULE,
+ .capabilities = PERF_PMU_CAP_NO_EXCLUDE,
+ .task_ctx_nr = perf_invalid_context,
+ .attr_groups = attr_groups,
+ .event_init = ddr_perf_event_init,
+ .add = ddr_perf_event_add,
+ .del = ddr_perf_event_del,
+ .start = ddr_perf_event_start,
+ .stop = ddr_perf_event_stop,
+ .read = ddr_perf_event_update,
+ .pmu_enable = ddr_perf_pmu_enable,
+ .pmu_disable = ddr_perf_pmu_disable,
+ },
+ .base = base,
+ .dev = dev,
+ };
+}
+
+static irqreturn_t ddr_perf_irq_handler(int irq, void *p)
+{
+ struct ddr_pmu *pmu = (struct ddr_pmu *)p;
+ struct perf_event *event;
+ int i;
+
+ /*
+ * Counters can generate an interrupt on an overflow when msb of a
+ * counter changes from 0 to 1. For the interrupt to be signalled,
+ * below condition mush be satisfied:
+ * PMGC0[PMIE] = 1, PMGC0[FCECE] = 1, PMLCAn[CE] = 1
+ * When an interrupt is signalled, PMGC0[FAC] is set by hardware and
+ * all of the registers are frozen.
+ * Software can clear the interrupt condition by resetting the performance
+ * monitor and clearing the most significant bit of the counter that
+ * generate the overflow.
+ */
+ for (i = 0; i < NUM_COUNTERS; i++) {
+ if (!pmu->events[i])
+ continue;
+
+ event = pmu->events[i];
+
+ ddr_perf_event_update(event);
+ }
+
+ ddr_perf_counter_global_config(pmu, true);
+
+ return IRQ_HANDLED;
+}
+
+static int ddr_perf_offline_cpu(unsigned int cpu, struct hlist_node *node)
+{
+ struct ddr_pmu *pmu = hlist_entry_safe(node, struct ddr_pmu, node);
+ int target;
+
+ if (cpu != pmu->cpu)
+ return 0;
+
+ target = cpumask_any_but(cpu_online_mask, cpu);
+ if (target >= nr_cpu_ids)
+ return 0;
+
+ perf_pmu_migrate_context(&pmu->pmu, cpu, target);
+ pmu->cpu = target;
+
+ WARN_ON(irq_set_affinity(pmu->irq, cpumask_of(pmu->cpu)));
+
+ return 0;
+}
+
+static int ddr_perf_probe(struct platform_device *pdev)
+{
+ struct ddr_pmu *pmu;
+ void __iomem *base;
+ int ret, irq;
+ char *name;
+
+ base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ pmu = devm_kzalloc(&pdev->dev, sizeof(*pmu), GFP_KERNEL);
+ if (!pmu)
+ return -ENOMEM;
+
+ ddr_perf_init(pmu, base, &pdev->dev);
+
+ pmu->devtype_data = of_device_get_match_data(&pdev->dev);
+
+ platform_set_drvdata(pdev, pmu);
+
+ pmu->id = ida_simple_get(&ddr_ida, 0, 0, GFP_KERNEL);
+ name = devm_kasprintf(&pdev->dev, GFP_KERNEL, DDR_PERF_DEV_NAME "%d", pmu->id);
+ if (!name) {
+ ret = -ENOMEM;
+ goto format_string_err;
+ }
+
+ pmu->cpu = raw_smp_processor_id();
+ ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, DDR_CPUHP_CB_NAME,
+ NULL, ddr_perf_offline_cpu);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Failed to add callbacks for multi state\n");
+ goto cpuhp_state_err;
+ }
+ pmu->cpuhp_state = ret;
+
+ /* Register the pmu instance for cpu hotplug */
+ ret = cpuhp_state_add_instance_nocalls(pmu->cpuhp_state, &pmu->node);
+ if (ret) {
+ dev_err(&pdev->dev, "Error %d registering hotplug\n", ret);
+ goto cpuhp_instance_err;
+ }
+
+ /* Request irq */
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ ret = irq;
+ goto ddr_perf_err;
+ }
+
+ ret = devm_request_irq(&pdev->dev, irq, ddr_perf_irq_handler,
+ IRQF_NOBALANCING | IRQF_NO_THREAD,
+ DDR_CPUHP_CB_NAME, pmu);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Request irq failed: %d", ret);
+ goto ddr_perf_err;
+ }
+
+ pmu->irq = irq;
+ ret = irq_set_affinity(pmu->irq, cpumask_of(pmu->cpu));
+ if (ret) {
+ dev_err(pmu->dev, "Failed to set interrupt affinity\n");
+ goto ddr_perf_err;
+ }
+
+ ret = perf_pmu_register(&pmu->pmu, name, -1);
+ if (ret)
+ goto ddr_perf_err;
+
+ return 0;
+
+ddr_perf_err:
+ cpuhp_state_remove_instance_nocalls(pmu->cpuhp_state, &pmu->node);
+cpuhp_instance_err:
+ cpuhp_remove_multi_state(pmu->cpuhp_state);
+cpuhp_state_err:
+format_string_err:
+ ida_simple_remove(&ddr_ida, pmu->id);
+ dev_warn(&pdev->dev, "i.MX9 DDR Perf PMU failed (%d), disabled\n", ret);
+ return ret;
+}
+
+static int ddr_perf_remove(struct platform_device *pdev)
+{
+ struct ddr_pmu *pmu = platform_get_drvdata(pdev);
+
+ cpuhp_state_remove_instance_nocalls(pmu->cpuhp_state, &pmu->node);
+ cpuhp_remove_multi_state(pmu->cpuhp_state);
+
+ perf_pmu_unregister(&pmu->pmu);
+
+ ida_simple_remove(&ddr_ida, pmu->id);
+
+ return 0;
+}
+
+static struct platform_driver imx_ddr_pmu_driver = {
+ .driver = {
+ .name = "imx9-ddr-pmu",
+ .of_match_table = imx_ddr_pmu_dt_ids,
+ .suppress_bind_attrs = true,
+ },
+ .probe = ddr_perf_probe,
+ .remove = ddr_perf_remove,
+};
+module_platform_driver(imx_ddr_pmu_driver);
+
+MODULE_AUTHOR("Xu Yang <xu.yang_2@nxp.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("DDRC PerfMon for i.MX9 SoCs");
projects / platform / kernel / linux-starfive.git / commitdiff