--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Alibaba DDR Sub-System Driveway PMU driver
+ *
+ * Copyright (C) 2022 Alibaba Inc
+ */
+
+#define ALI_DRW_PMUNAME "ali_drw"
+#define ALI_DRW_DRVNAME ALI_DRW_PMUNAME "_pmu"
+#define pr_fmt(fmt) ALI_DRW_DRVNAME ": " fmt
+
+#include <linux/acpi.h>
+#include <linux/bitfield.h>
+#include <linux/bitmap.h>
+#include <linux/bitops.h>
+#include <linux/cpuhotplug.h>
+#include <linux/cpumask.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/perf_event.h>
+#include <linux/platform_device.h>
+#include <linux/printk.h>
+#include <linux/rculist.h>
+#include <linux/refcount.h>
+
+
+#define ALI_DRW_PMU_COMMON_MAX_COUNTERS 16
+#define ALI_DRW_PMU_TEST_SEL_COMMON_COUNTER_BASE 19
+
+#define ALI_DRW_PMU_PA_SHIFT 12
+#define ALI_DRW_PMU_CNT_INIT 0x00000000
+#define ALI_DRW_CNT_MAX_PERIOD 0xffffffff
+#define ALI_DRW_PMU_CYCLE_EVT_ID 0x80
+
+#define ALI_DRW_PMU_CNT_CTRL 0xC00
+#define ALI_DRW_PMU_CNT_RST BIT(2)
+#define ALI_DRW_PMU_CNT_STOP BIT(1)
+#define ALI_DRW_PMU_CNT_START BIT(0)
+
+#define ALI_DRW_PMU_CNT_STATE 0xC04
+#define ALI_DRW_PMU_TEST_CTRL 0xC08
+#define ALI_DRW_PMU_CNT_PRELOAD 0xC0C
+
+#define ALI_DRW_PMU_CYCLE_CNT_HIGH_MASK GENMASK(23, 0)
+#define ALI_DRW_PMU_CYCLE_CNT_LOW_MASK GENMASK(31, 0)
+#define ALI_DRW_PMU_CYCLE_CNT_HIGH 0xC10
+#define ALI_DRW_PMU_CYCLE_CNT_LOW 0xC14
+
+/* PMU EVENT SEL 0-3 are paired in 32-bit registers on a 4-byte stride */
+#define ALI_DRW_PMU_EVENT_SEL0 0xC68
+/* counter 0-3 use sel0, counter 4-7 use sel1...*/
+#define ALI_DRW_PMU_EVENT_SELn(n) \
+ (ALI_DRW_PMU_EVENT_SEL0 + (n / 4) * 0x4)
+#define ALI_DRW_PMCOM_CNT_EN BIT(7)
+#define ALI_DRW_PMCOM_CNT_EVENT_MASK GENMASK(5, 0)
+#define ALI_DRW_PMCOM_CNT_EVENT_OFFSET(n) \
+ (8 * (n % 4))
+
+/* PMU COMMON COUNTER 0-15, are paired in 32-bit registers on a 4-byte stride */
+#define ALI_DRW_PMU_COMMON_COUNTER0 0xC78
+#define ALI_DRW_PMU_COMMON_COUNTERn(n) \
+ (ALI_DRW_PMU_COMMON_COUNTER0 + 0x4 * (n))
+
+#define ALI_DRW_PMU_OV_INTR_ENABLE_CTL 0xCB8
+#define ALI_DRW_PMU_OV_INTR_DISABLE_CTL 0xCBC
+#define ALI_DRW_PMU_OV_INTR_ENABLE_STATUS 0xCC0
+#define ALI_DRW_PMU_OV_INTR_CLR 0xCC4
+#define ALI_DRW_PMU_OV_INTR_STATUS 0xCC8
+#define ALI_DRW_PMCOM_CNT_OV_INTR_MASK GENMASK(23, 8)
+#define ALI_DRW_PMBW_CNT_OV_INTR_MASK GENMASK(7, 0)
+#define ALI_DRW_PMU_OV_INTR_MASK GENMASK_ULL(63, 0)
+
+static int ali_drw_cpuhp_state_num;
+
+static LIST_HEAD(ali_drw_pmu_irqs);
+static DEFINE_MUTEX(ali_drw_pmu_irqs_lock);
+
+struct ali_drw_pmu_irq {
+ struct hlist_node node;
+ struct list_head irqs_node;
+ struct list_head pmus_node;
+ int irq_num;
+ int cpu;
+ refcount_t refcount;
+};
+
+struct ali_drw_pmu {
+ void __iomem *cfg_base;
+ struct device *dev;
+
+ struct list_head pmus_node;
+ struct ali_drw_pmu_irq *irq;
+ int irq_num;
+ int cpu;
+ DECLARE_BITMAP(used_mask, ALI_DRW_PMU_COMMON_MAX_COUNTERS);
+ struct perf_event *events[ALI_DRW_PMU_COMMON_MAX_COUNTERS];
+ int evtids[ALI_DRW_PMU_COMMON_MAX_COUNTERS];
+
+ struct pmu pmu;
+};
+
+#define to_ali_drw_pmu(p) (container_of(p, struct ali_drw_pmu, pmu))
+
+#define DRW_CONFIG_EVENTID GENMASK(7, 0)
+#define GET_DRW_EVENTID(event) FIELD_GET(DRW_CONFIG_EVENTID, (event)->attr.config)
+
+static ssize_t ali_drw_pmu_format_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct dev_ext_attribute *eattr;
+
+ eattr = container_of(attr, struct dev_ext_attribute, attr);
+
+ return sprintf(buf, "%s\n", (char *)eattr->var);
+}
+
+/*
+ * PMU event attributes
+ */
+static ssize_t ali_drw_pmu_event_show(struct device *dev,
+ struct device_attribute *attr, char *page)
+{
+ struct dev_ext_attribute *eattr;
+
+ eattr = container_of(attr, struct dev_ext_attribute, attr);
+
+ return sprintf(page, "config=0x%lx\n", (unsigned long)eattr->var);
+}
+
+#define ALI_DRW_PMU_ATTR(_name, _func, _config) \
+ (&((struct dev_ext_attribute[]) { \
+ { __ATTR(_name, 0444, _func, NULL), (void *)_config } \
+ })[0].attr.attr)
+
+#define ALI_DRW_PMU_FORMAT_ATTR(_name, _config) \
+ ALI_DRW_PMU_ATTR(_name, ali_drw_pmu_format_show, (void *)_config)
+#define ALI_DRW_PMU_EVENT_ATTR(_name, _config) \
+ ALI_DRW_PMU_ATTR(_name, ali_drw_pmu_event_show, (unsigned long)_config)
+
+static struct attribute *ali_drw_pmu_events_attrs[] = {
+ ALI_DRW_PMU_EVENT_ATTR(hif_rd_or_wr, 0x0),
+ ALI_DRW_PMU_EVENT_ATTR(hif_wr, 0x1),
+ ALI_DRW_PMU_EVENT_ATTR(hif_rd, 0x2),
+ ALI_DRW_PMU_EVENT_ATTR(hif_rmw, 0x3),
+ ALI_DRW_PMU_EVENT_ATTR(hif_hi_pri_rd, 0x4),
+ ALI_DRW_PMU_EVENT_ATTR(dfi_wr_data_cycles, 0x7),
+ ALI_DRW_PMU_EVENT_ATTR(dfi_rd_data_cycles, 0x8),
+ ALI_DRW_PMU_EVENT_ATTR(hpr_xact_when_critical, 0x9),
+ ALI_DRW_PMU_EVENT_ATTR(lpr_xact_when_critical, 0xA),
+ ALI_DRW_PMU_EVENT_ATTR(wr_xact_when_critical, 0xB),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_activate, 0xC),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_rd_or_wr, 0xD),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_rd_activate, 0xE),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_rd, 0xF),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_wr, 0x10),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_mwr, 0x11),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_precharge, 0x12),
+ ALI_DRW_PMU_EVENT_ATTR(precharge_for_rdwr, 0x13),
+ ALI_DRW_PMU_EVENT_ATTR(precharge_for_other, 0x14),
+ ALI_DRW_PMU_EVENT_ATTR(rdwr_transitions, 0x15),
+ ALI_DRW_PMU_EVENT_ATTR(write_combine, 0x16),
+ ALI_DRW_PMU_EVENT_ATTR(war_hazard, 0x17),
+ ALI_DRW_PMU_EVENT_ATTR(raw_hazard, 0x18),
+ ALI_DRW_PMU_EVENT_ATTR(waw_hazard, 0x19),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_enter_selfref_rk0, 0x1A),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_enter_selfref_rk1, 0x1B),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_enter_selfref_rk2, 0x1C),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_enter_selfref_rk3, 0x1D),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_enter_powerdown_rk0, 0x1E),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_enter_powerdown_rk1, 0x1F),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_enter_powerdown_rk2, 0x20),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_enter_powerdown_rk3, 0x21),
+ ALI_DRW_PMU_EVENT_ATTR(selfref_mode_rk0, 0x26),
+ ALI_DRW_PMU_EVENT_ATTR(selfref_mode_rk1, 0x27),
+ ALI_DRW_PMU_EVENT_ATTR(selfref_mode_rk2, 0x28),
+ ALI_DRW_PMU_EVENT_ATTR(selfref_mode_rk3, 0x29),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_refresh, 0x2A),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_crit_ref, 0x2B),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_load_mode, 0x2D),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_zqcl, 0x2E),
+ ALI_DRW_PMU_EVENT_ATTR(visible_window_limit_reached_rd, 0x30),
+ ALI_DRW_PMU_EVENT_ATTR(visible_window_limit_reached_wr, 0x31),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_dqsosc_mpc, 0x34),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_dqsosc_mrr, 0x35),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_tcr_mrr, 0x36),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_zqstart, 0x37),
+ ALI_DRW_PMU_EVENT_ATTR(op_is_zqlatch, 0x38),
+ ALI_DRW_PMU_EVENT_ATTR(chi_txreq, 0x39),
+ ALI_DRW_PMU_EVENT_ATTR(chi_txdat, 0x3A),
+ ALI_DRW_PMU_EVENT_ATTR(chi_rxdat, 0x3B),
+ ALI_DRW_PMU_EVENT_ATTR(chi_rxrsp, 0x3C),
+ ALI_DRW_PMU_EVENT_ATTR(tsz_vio, 0x3D),
+ ALI_DRW_PMU_EVENT_ATTR(cycle, 0x80),
+ NULL,
+};
+
+static struct attribute_group ali_drw_pmu_events_attr_group = {
+ .name = "events",
+ .attrs = ali_drw_pmu_events_attrs,
+};
+
+static struct attribute *ali_drw_pmu_format_attr[] = {
+ ALI_DRW_PMU_FORMAT_ATTR(event, "config:0-7"),
+ NULL,
+};
+
+static const struct attribute_group ali_drw_pmu_format_group = {
+ .name = "format",
+ .attrs = ali_drw_pmu_format_attr,
+};
+
+static ssize_t ali_drw_pmu_cpumask_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct ali_drw_pmu *drw_pmu = to_ali_drw_pmu(dev_get_drvdata(dev));
+
+ return cpumap_print_to_pagebuf(true, buf, cpumask_of(drw_pmu->cpu));
+}
+
+static struct device_attribute ali_drw_pmu_cpumask_attr =
+ __ATTR(cpumask, 0444, ali_drw_pmu_cpumask_show, NULL);
+
+static struct attribute *ali_drw_pmu_cpumask_attrs[] = {
+ &ali_drw_pmu_cpumask_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group ali_drw_pmu_cpumask_attr_group = {
+ .attrs = ali_drw_pmu_cpumask_attrs,
+};
+
+static const struct attribute_group *ali_drw_pmu_attr_groups[] = {
+ &ali_drw_pmu_events_attr_group,
+ &ali_drw_pmu_cpumask_attr_group,
+ &ali_drw_pmu_format_group,
+ NULL,
+};
+
+/* find a counter for event, then in add func, hw.idx will equal to counter */
+static int ali_drw_get_counter_idx(struct perf_event *event)
+{
+ struct ali_drw_pmu *drw_pmu = to_ali_drw_pmu(event->pmu);
+ int idx;
+
+ for (idx = 0; idx < ALI_DRW_PMU_COMMON_MAX_COUNTERS; ++idx) {
+ if (!test_and_set_bit(idx, drw_pmu->used_mask))
+ return idx;
+ }
+
+ /* The counters are all in use. */
+ return -EBUSY;
+}
+
+static u64 ali_drw_pmu_read_counter(struct perf_event *event)
+{
+ struct ali_drw_pmu *drw_pmu = to_ali_drw_pmu(event->pmu);
+ u64 cycle_high, cycle_low;
+
+ if (GET_DRW_EVENTID(event) == ALI_DRW_PMU_CYCLE_EVT_ID) {
+ cycle_high = readl(drw_pmu->cfg_base + ALI_DRW_PMU_CYCLE_CNT_HIGH);
+ cycle_high &= ALI_DRW_PMU_CYCLE_CNT_HIGH_MASK;
+ cycle_low = readl(drw_pmu->cfg_base + ALI_DRW_PMU_CYCLE_CNT_LOW);
+ cycle_low &= ALI_DRW_PMU_CYCLE_CNT_LOW_MASK;
+ return (cycle_high << 32 | cycle_low);
+ }
+
+ return readl(drw_pmu->cfg_base +
+ ALI_DRW_PMU_COMMON_COUNTERn(event->hw.idx));
+}
+
+static void ali_drw_pmu_event_update(struct perf_event *event)
+{
+ struct hw_perf_event *hwc = &event->hw;
+ u64 delta, prev, now;
+
+ do {
+ prev = local64_read(&hwc->prev_count);
+ now = ali_drw_pmu_read_counter(event);
+ } while (local64_cmpxchg(&hwc->prev_count, prev, now) != prev);
+
+ /* handle overflow. */
+ delta = now - prev;
+ if (GET_DRW_EVENTID(event) == ALI_DRW_PMU_CYCLE_EVT_ID)
+ delta &= ALI_DRW_PMU_OV_INTR_MASK;
+ else
+ delta &= ALI_DRW_CNT_MAX_PERIOD;
+ local64_add(delta, &event->count);
+}
+
+static void ali_drw_pmu_event_set_period(struct perf_event *event)
+{
+ u64 pre_val;
+ struct ali_drw_pmu *drw_pmu = to_ali_drw_pmu(event->pmu);
+
+ /* set a preload counter for test purpose */
+ writel(ALI_DRW_PMU_TEST_SEL_COMMON_COUNTER_BASE + event->hw.idx,
+ drw_pmu->cfg_base + ALI_DRW_PMU_TEST_CTRL);
+
+ /* set conunter initial value */
+ pre_val = ALI_DRW_PMU_CNT_INIT;
+ writel(pre_val, drw_pmu->cfg_base + ALI_DRW_PMU_CNT_PRELOAD);
+ local64_set(&event->hw.prev_count, pre_val);
+
+ /* set sel mode to zero to start test */
+ writel(0x0, drw_pmu->cfg_base + ALI_DRW_PMU_TEST_CTRL);
+}
+
+static void ali_drw_pmu_enable_counter(struct perf_event *event)
+{
+ u32 val, subval, reg, shift;
+ int counter = event->hw.idx;
+ struct ali_drw_pmu *drw_pmu = to_ali_drw_pmu(event->pmu);
+
+ reg = ALI_DRW_PMU_EVENT_SELn(counter);
+ val = readl(drw_pmu->cfg_base + reg);
+ subval = FIELD_PREP(ALI_DRW_PMCOM_CNT_EN, 1) |
+ FIELD_PREP(ALI_DRW_PMCOM_CNT_EVENT_MASK, drw_pmu->evtids[counter]);
+
+ shift = ALI_DRW_PMCOM_CNT_EVENT_OFFSET(counter);
+ val &= ~(GENMASK(7, 0) << shift);
+ val |= subval << shift;
+
+ writel(val, drw_pmu->cfg_base + reg);
+}
+
+static void ali_drw_pmu_disable_counter(struct perf_event *event)
+{
+ u32 val, reg, subval, shift;
+ struct ali_drw_pmu *drw_pmu = to_ali_drw_pmu(event->pmu);
+ int counter = event->hw.idx;
+
+ reg = ALI_DRW_PMU_EVENT_SELn(counter);
+ val = readl(drw_pmu->cfg_base + reg);
+ subval = FIELD_PREP(ALI_DRW_PMCOM_CNT_EN, 0) |
+ FIELD_PREP(ALI_DRW_PMCOM_CNT_EVENT_MASK, 0);
+
+ shift = ALI_DRW_PMCOM_CNT_EVENT_OFFSET(counter);
+ val &= ~(GENMASK(7, 0) << shift);
+ val |= subval << shift;
+
+ writel(val, drw_pmu->cfg_base + reg);
+}
+
+static irqreturn_t ali_drw_pmu_isr(int irq_num, void *data)
+{
+ struct ali_drw_pmu_irq *irq = data;
+ struct ali_drw_pmu *drw_pmu;
+ irqreturn_t ret = IRQ_NONE;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(drw_pmu, &irq->pmus_node, pmus_node) {
+ unsigned long status, clr_status;
+ struct perf_event *event;
+ unsigned int idx;
+
+ for (idx = 0; idx < ALI_DRW_PMU_COMMON_MAX_COUNTERS; idx++) {
+ event = drw_pmu->events[idx];
+ if (!event)
+ continue;
+ ali_drw_pmu_disable_counter(event);
+ }
+
+ /* common counter intr status */
+ status = readl(drw_pmu->cfg_base + ALI_DRW_PMU_OV_INTR_STATUS);
+ status = FIELD_GET(ALI_DRW_PMCOM_CNT_OV_INTR_MASK, status);
+ if (status) {
+ for_each_set_bit(idx, &status,
+ ALI_DRW_PMU_COMMON_MAX_COUNTERS) {
+ event = drw_pmu->events[idx];
+ if (WARN_ON_ONCE(!event))
+ continue;
+ ali_drw_pmu_event_update(event);
+ ali_drw_pmu_event_set_period(event);
+ }
+
+ /* clear common counter intr status */
+ clr_status = FIELD_PREP(ALI_DRW_PMCOM_CNT_OV_INTR_MASK, 1);
+ writel(clr_status,
+ drw_pmu->cfg_base + ALI_DRW_PMU_OV_INTR_CLR);
+ }
+
+ for (idx = 0; idx < ALI_DRW_PMU_COMMON_MAX_COUNTERS; idx++) {
+ event = drw_pmu->events[idx];
+ if (!event)
+ continue;
+ if (!(event->hw.state & PERF_HES_STOPPED))
+ ali_drw_pmu_enable_counter(event);
+ }
+ if (status)
+ ret = IRQ_HANDLED;
+ }
+ rcu_read_unlock();
+ return ret;
+}
+
+static struct ali_drw_pmu_irq *__ali_drw_pmu_init_irq(struct platform_device
+ *pdev, int irq_num)
+{
+ int ret;
+ struct ali_drw_pmu_irq *irq;
+
+ list_for_each_entry(irq, &ali_drw_pmu_irqs, irqs_node) {
+ if (irq->irq_num == irq_num
+ && refcount_inc_not_zero(&irq->refcount))
+ return irq;
+ }
+
+ irq = kzalloc(sizeof(*irq), GFP_KERNEL);
+ if (!irq)
+ return ERR_PTR(-ENOMEM);
+
+ INIT_LIST_HEAD(&irq->pmus_node);
+
+ /* Pick one CPU to be the preferred one to use */
+ irq->cpu = smp_processor_id();
+ refcount_set(&irq->refcount, 1);
+
+ /*
+ * FIXME: one of DDRSS Driveway PMU overflow interrupt shares the same
+ * irq number with MPAM ERR_IRQ. To register DDRSS PMU and MPAM drivers
+ * successfully, add IRQF_SHARED flag. Howerer, PMU interrupt should not
+ * share with other component.
+ */
+ ret = devm_request_irq(&pdev->dev, irq_num, ali_drw_pmu_isr,
+ IRQF_SHARED, dev_name(&pdev->dev), irq);
+ if (ret < 0) {
+ dev_err(&pdev->dev,
+ "Fail to request IRQ:%d ret:%d\n", irq_num, ret);
+ goto out_free;
+ }
+
+ ret = irq_set_affinity_hint(irq_num, cpumask_of(irq->cpu));
+ if (ret)
+ goto out_free;
+
+ ret = cpuhp_state_add_instance_nocalls(ali_drw_cpuhp_state_num,
+ &irq->node);
+ if (ret)
+ goto out_free;
+
+ irq->irq_num = irq_num;
+ list_add(&irq->irqs_node, &ali_drw_pmu_irqs);
+
+ return irq;
+
+out_free:
+ kfree(irq);
+ return ERR_PTR(ret);
+}
+
+static int ali_drw_pmu_init_irq(struct ali_drw_pmu *drw_pmu,
+ struct platform_device *pdev)
+{
+ int irq_num;
+ struct ali_drw_pmu_irq *irq;
+
+ /* Read and init IRQ */
+ irq_num = platform_get_irq(pdev, 0);
+ if (irq_num < 0)
+ return irq_num;
+
+ mutex_lock(&ali_drw_pmu_irqs_lock);
+ irq = __ali_drw_pmu_init_irq(pdev, irq_num);
+ mutex_unlock(&ali_drw_pmu_irqs_lock);
+
+ if (IS_ERR(irq))
+ return PTR_ERR(irq);
+
+ drw_pmu->irq = irq;
+
+ mutex_lock(&ali_drw_pmu_irqs_lock);
+ list_add_rcu(&drw_pmu->pmus_node, &irq->pmus_node);
+ mutex_unlock(&ali_drw_pmu_irqs_lock);
+
+ return 0;
+}
+
+static void ali_drw_pmu_uninit_irq(struct ali_drw_pmu *drw_pmu)
+{
+ struct ali_drw_pmu_irq *irq = drw_pmu->irq;
+
+ mutex_lock(&ali_drw_pmu_irqs_lock);
+ list_del_rcu(&drw_pmu->pmus_node);
+
+ if (!refcount_dec_and_test(&irq->refcount)) {
+ mutex_unlock(&ali_drw_pmu_irqs_lock);
+ return;
+ }
+
+ list_del(&irq->irqs_node);
+ mutex_unlock(&ali_drw_pmu_irqs_lock);
+
+ WARN_ON(irq_set_affinity_hint(irq->irq_num, NULL));
+ cpuhp_state_remove_instance_nocalls(ali_drw_cpuhp_state_num,
+ &irq->node);
+ kfree(irq);
+}
+
+static int ali_drw_pmu_event_init(struct perf_event *event)
+{
+ struct ali_drw_pmu *drw_pmu = to_ali_drw_pmu(event->pmu);
+ struct hw_perf_event *hwc = &event->hw;
+ struct perf_event *sibling;
+ struct device *dev = drw_pmu->pmu.dev;
+
+ if (event->attr.type != event->pmu->type)
+ return -ENOENT;
+
+ if (is_sampling_event(event)) {
+ dev_err(dev, "Sampling not supported!\n");
+ return -EOPNOTSUPP;
+ }
+
+ if (event->attach_state & PERF_ATTACH_TASK) {
+ dev_err(dev, "Per-task counter cannot allocate!\n");
+ return -EOPNOTSUPP;
+ }
+
+ event->cpu = drw_pmu->cpu;
+ if (event->cpu < 0) {
+ dev_err(dev, "Per-task mode not supported!\n");
+ return -EOPNOTSUPP;
+ }
+
+ if (event->group_leader != event &&
+ !is_software_event(event->group_leader)) {
+ dev_err(dev, "driveway only allow one event!\n");
+ return -EINVAL;
+ }
+
+ for_each_sibling_event(sibling, event->group_leader) {
+ if (sibling != event && !is_software_event(sibling)) {
+ dev_err(dev, "driveway event not allowed!\n");
+ return -EINVAL;
+ }
+ }
+
+ /* reset all the pmu counters */
+ writel(ALI_DRW_PMU_CNT_RST, drw_pmu->cfg_base + ALI_DRW_PMU_CNT_CTRL);
+
+ hwc->idx = -1;
+
+ return 0;
+}
+
+static void ali_drw_pmu_start(struct perf_event *event, int flags)
+{
+ struct ali_drw_pmu *drw_pmu = to_ali_drw_pmu(event->pmu);
+
+ event->hw.state = 0;
+
+ if (GET_DRW_EVENTID(event) == ALI_DRW_PMU_CYCLE_EVT_ID) {
+ writel(ALI_DRW_PMU_CNT_START,
+ drw_pmu->cfg_base + ALI_DRW_PMU_CNT_CTRL);
+ return;
+ }
+
+ ali_drw_pmu_event_set_period(event);
+ if (flags & PERF_EF_RELOAD) {
+ unsigned long prev_raw_count =
+ local64_read(&event->hw.prev_count);
+ writel(prev_raw_count,
+ drw_pmu->cfg_base + ALI_DRW_PMU_CNT_PRELOAD);
+ }
+
+ ali_drw_pmu_enable_counter(event);
+
+ writel(ALI_DRW_PMU_CNT_START, drw_pmu->cfg_base + ALI_DRW_PMU_CNT_CTRL);
+}
+
+static void ali_drw_pmu_stop(struct perf_event *event, int flags)
+{
+ struct ali_drw_pmu *drw_pmu = to_ali_drw_pmu(event->pmu);
+
+ if (event->hw.state & PERF_HES_STOPPED)
+ return;
+
+ if (GET_DRW_EVENTID(event) != ALI_DRW_PMU_CYCLE_EVT_ID)
+ ali_drw_pmu_disable_counter(event);
+
+ writel(ALI_DRW_PMU_CNT_STOP, drw_pmu->cfg_base + ALI_DRW_PMU_CNT_CTRL);
+
+ ali_drw_pmu_event_update(event);
+ event->hw.state |= PERF_HES_STOPPED | PERF_HES_UPTODATE;
+}
+
+static int ali_drw_pmu_add(struct perf_event *event, int flags)
+{
+ struct ali_drw_pmu *drw_pmu = to_ali_drw_pmu(event->pmu);
+ struct hw_perf_event *hwc = &event->hw;
+ int idx = -1;
+ int evtid;
+
+ evtid = GET_DRW_EVENTID(event);
+
+ if (evtid != ALI_DRW_PMU_CYCLE_EVT_ID) {
+ idx = ali_drw_get_counter_idx(event);
+ if (idx < 0)
+ return idx;
+ drw_pmu->events[idx] = event;
+ drw_pmu->evtids[idx] = evtid;
+ }
+ hwc->idx = idx;
+
+ hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE;
+
+ if (flags & PERF_EF_START)
+ ali_drw_pmu_start(event, PERF_EF_RELOAD);
+
+ /* Propagate our changes to the userspace mapping. */
+ perf_event_update_userpage(event);
+
+ return 0;
+}
+
+static void ali_drw_pmu_del(struct perf_event *event, int flags)
+{
+ struct ali_drw_pmu *drw_pmu = to_ali_drw_pmu(event->pmu);
+ struct hw_perf_event *hwc = &event->hw;
+ int idx = hwc->idx;
+
+ ali_drw_pmu_stop(event, PERF_EF_UPDATE);
+
+ if (idx >= 0 && idx < ALI_DRW_PMU_COMMON_MAX_COUNTERS) {
+ drw_pmu->events[idx] = NULL;
+ drw_pmu->evtids[idx] = 0;
+ clear_bit(idx, drw_pmu->used_mask);
+ }
+
+ perf_event_update_userpage(event);
+}
+
+static void ali_drw_pmu_read(struct perf_event *event)
+{
+ ali_drw_pmu_event_update(event);
+}
+
+static int ali_drw_pmu_probe(struct platform_device *pdev)
+{
+ struct ali_drw_pmu *drw_pmu;
+ struct resource *res;
+ char *name;
+ int ret;
+
+ drw_pmu = devm_kzalloc(&pdev->dev, sizeof(*drw_pmu), GFP_KERNEL);
+ if (!drw_pmu)
+ return -ENOMEM;
+
+ drw_pmu->dev = &pdev->dev;
+ platform_set_drvdata(pdev, drw_pmu);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ drw_pmu->cfg_base = devm_ioremap_resource(&pdev->dev, res);
+ if (!drw_pmu->cfg_base)
+ return -ENOMEM;
+
+ name = devm_kasprintf(drw_pmu->dev, GFP_KERNEL, "ali_drw_%llx",
+ (u64) (res->start >> ALI_DRW_PMU_PA_SHIFT));
+ if (!name)
+ return -ENOMEM;
+
+ writel(ALI_DRW_PMU_CNT_RST, drw_pmu->cfg_base + ALI_DRW_PMU_CNT_CTRL);
+
+ /* enable the generation of interrupt by all common counters */
+ writel(ALI_DRW_PMCOM_CNT_OV_INTR_MASK,
+ drw_pmu->cfg_base + ALI_DRW_PMU_OV_INTR_ENABLE_CTL);
+
+ /* clearing interrupt status */
+ writel(0xffffff, drw_pmu->cfg_base + ALI_DRW_PMU_OV_INTR_CLR);
+
+ drw_pmu->cpu = smp_processor_id();
+
+ ret = ali_drw_pmu_init_irq(drw_pmu, pdev);
+ if (ret)
+ return ret;
+
+ drw_pmu->pmu = (struct pmu) {
+ .module = THIS_MODULE,
+ .task_ctx_nr = perf_invalid_context,
+ .event_init = ali_drw_pmu_event_init,
+ .add = ali_drw_pmu_add,
+ .del = ali_drw_pmu_del,
+ .start = ali_drw_pmu_start,
+ .stop = ali_drw_pmu_stop,
+ .read = ali_drw_pmu_read,
+ .attr_groups = ali_drw_pmu_attr_groups,
+ .capabilities = PERF_PMU_CAP_NO_EXCLUDE,
+ };
+
+ ret = perf_pmu_register(&drw_pmu->pmu, name, -1);
+ if (ret) {
+ dev_err(drw_pmu->dev, "DRW Driveway PMU PMU register failed!\n");
+ ali_drw_pmu_uninit_irq(drw_pmu);
+ }
+
+ return ret;
+}
+
+static int ali_drw_pmu_remove(struct platform_device *pdev)
+{
+ struct ali_drw_pmu *drw_pmu = platform_get_drvdata(pdev);
+
+ /* disable the generation of interrupt by all common counters */
+ writel(ALI_DRW_PMCOM_CNT_OV_INTR_MASK,
+ drw_pmu->cfg_base + ALI_DRW_PMU_OV_INTR_DISABLE_CTL);
+
+ ali_drw_pmu_uninit_irq(drw_pmu);
+ perf_pmu_unregister(&drw_pmu->pmu);
+
+ return 0;
+}
+
+static int ali_drw_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
+{
+ struct ali_drw_pmu_irq *irq;
+ struct ali_drw_pmu *drw_pmu;
+ unsigned int target;
+ int ret;
+ cpumask_t node_online_cpus;
+
+ irq = hlist_entry_safe(node, struct ali_drw_pmu_irq, node);
+ if (cpu != irq->cpu)
+ return 0;
+
+ ret = cpumask_and(&node_online_cpus,
+ cpumask_of_node(cpu_to_node(cpu)), cpu_online_mask);
+ if (ret)
+ target = cpumask_any_but(&node_online_cpus, cpu);
+ else
+ target = cpumask_any_but(cpu_online_mask, cpu);
+
+ if (target >= nr_cpu_ids)
+ return 0;
+
+ /* We're only reading, but this isn't the place to be involving RCU */
+ mutex_lock(&ali_drw_pmu_irqs_lock);
+ list_for_each_entry(drw_pmu, &irq->pmus_node, pmus_node)
+ perf_pmu_migrate_context(&drw_pmu->pmu, irq->cpu, target);
+ mutex_unlock(&ali_drw_pmu_irqs_lock);
+
+ WARN_ON(irq_set_affinity_hint(irq->irq_num, cpumask_of(target)));
+ irq->cpu = target;
+
+ return 0;
+}
+
+/*
+ * Due to historical reasons, the HID used in the production environment is
+ * ARMHD700, so we leave ARMHD700 as Compatible ID.
+ */
+static const struct acpi_device_id ali_drw_acpi_match[] = {
+ {"BABA5000", 0},
+ {"ARMHD700", 0},
+ {}
+};
+
+MODULE_DEVICE_TABLE(acpi, ali_drw_acpi_match);
+
+static struct platform_driver ali_drw_pmu_driver = {
+ .driver = {
+ .name = "ali_drw_pmu",
+ .acpi_match_table = ali_drw_acpi_match,
+ },
+ .probe = ali_drw_pmu_probe,
+ .remove = ali_drw_pmu_remove,
+};
+
+static int __init ali_drw_pmu_init(void)
+{
+ int ret;
+
+ ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN,
+ "ali_drw_pmu:online",
+ NULL, ali_drw_pmu_offline_cpu);
+
+ if (ret < 0) {
+ pr_err("DRW Driveway PMU: setup hotplug failed, ret = %d\n",
+ ret);
+ return ret;
+ }
+ ali_drw_cpuhp_state_num = ret;
+
+ ret = platform_driver_register(&ali_drw_pmu_driver);
+ if (ret)
+ cpuhp_remove_multi_state(ali_drw_cpuhp_state_num);
+
+ return ret;
+}
+
+static void __exit ali_drw_pmu_exit(void)
+{
+ platform_driver_unregister(&ali_drw_pmu_driver);
+ cpuhp_remove_multi_state(ali_drw_cpuhp_state_num);
+}
+
+module_init(ali_drw_pmu_init);
+module_exit(ali_drw_pmu_exit);
+
+MODULE_DESCRIPTION("Alibaba DDR Sub-System Driveway PMU driver");
+MODULE_LICENSE("GPL v2");
projects / linux.git / commitdiff