/*
- * Copyright 2011 Freescale Semiconductor, Inc.
+ * Copyright 2011,2016 Freescale Semiconductor, Inc.
* Copyright 2011 Linaro Ltd.
*
* The code contained herein is licensed under the GNU General Public
* http://www.gnu.org/copyleft/gpl.html
*/
+#include <linux/hrtimer.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/perf_event.h>
+#include <linux/slab.h>
#include "common.h"
#define BM_MMDC_MDMISC_DDR_TYPE 0x18
#define BP_MMDC_MDMISC_DDR_TYPE 0x3
+#define TOTAL_CYCLES 0x0
+#define BUSY_CYCLES 0x1
+#define READ_ACCESSES 0x2
+#define WRITE_ACCESSES 0x3
+#define READ_BYTES 0x4
+#define WRITE_BYTES 0x5
+
+/* Enables, resets, freezes, overflow profiling*/
+#define DBG_DIS 0x0
+#define DBG_EN 0x1
+#define DBG_RST 0x2
+#define PRF_FRZ 0x4
+#define CYC_OVF 0x8
+
+#define MMDC_MADPCR0 0x410
+#define MMDC_MADPSR0 0x418
+#define MMDC_MADPSR1 0x41C
+#define MMDC_MADPSR2 0x420
+#define MMDC_MADPSR3 0x424
+#define MMDC_MADPSR4 0x428
+#define MMDC_MADPSR5 0x42C
+
+#define MMDC_NUM_COUNTERS 6
+
+#define to_mmdc_pmu(p) container_of(p, struct mmdc_pmu, pmu)
+
static int ddr_type;
+#ifdef CONFIG_PERF_EVENTS
+
+static DEFINE_IDA(mmdc_ida);
+
+PMU_EVENT_ATTR_STRING(total-cycles, mmdc_pmu_total_cycles, "event=0x00")
+PMU_EVENT_ATTR_STRING(busy-cycles, mmdc_pmu_busy_cycles, "event=0x01")
+PMU_EVENT_ATTR_STRING(read-accesses, mmdc_pmu_read_accesses, "event=0x02")
+PMU_EVENT_ATTR_STRING(write-accesses, mmdc_pmu_write_accesses, "config=0x03")
+PMU_EVENT_ATTR_STRING(read-bytes, mmdc_pmu_read_bytes, "event=0x04")
+PMU_EVENT_ATTR_STRING(read-bytes.unit, mmdc_pmu_read_bytes_unit, "MB");
+PMU_EVENT_ATTR_STRING(read-bytes.scale, mmdc_pmu_read_bytes_scale, "0.000001");
+PMU_EVENT_ATTR_STRING(write-bytes, mmdc_pmu_write_bytes, "event=0x05")
+PMU_EVENT_ATTR_STRING(write-bytes.unit, mmdc_pmu_write_bytes_unit, "MB");
+PMU_EVENT_ATTR_STRING(write-bytes.scale, mmdc_pmu_write_bytes_scale, "0.000001");
+
+struct mmdc_pmu {
+ struct pmu pmu;
+ void __iomem *mmdc_base;
+ cpumask_t cpu;
+ struct hrtimer hrtimer;
+ unsigned int active_events;
+ struct device *dev;
+ struct perf_event *mmdc_events[MMDC_NUM_COUNTERS];
+ struct hlist_node node;
+};
+
+/*
+ * Polling period is set to one second, overflow of total-cycles (the fastest
+ * increasing counter) takes ten seconds so one second is safe
+ */
+static unsigned int mmdc_pmu_poll_period_us = 1000000;
+
+module_param_named(pmu_pmu_poll_period_us, mmdc_pmu_poll_period_us, uint,
+ S_IRUGO | S_IWUSR);
+
+static ktime_t mmdc_pmu_timer_period(void)
+{
+ return ns_to_ktime((u64)mmdc_pmu_poll_period_us * 1000);
+}
+
+static ssize_t mmdc_pmu_cpumask_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct mmdc_pmu *pmu_mmdc = dev_get_drvdata(dev);
+
+ return cpumap_print_to_pagebuf(true, buf, &pmu_mmdc->cpu);
+}
+
+static struct device_attribute mmdc_pmu_cpumask_attr =
+ __ATTR(cpumask, S_IRUGO, mmdc_pmu_cpumask_show, NULL);
+
+static struct attribute *mmdc_pmu_cpumask_attrs[] = {
+ &mmdc_pmu_cpumask_attr.attr,
+ NULL,
+};
+
+static struct attribute_group mmdc_pmu_cpumask_attr_group = {
+ .attrs = mmdc_pmu_cpumask_attrs,
+};
+
+static struct attribute *mmdc_pmu_events_attrs[] = {
+ &mmdc_pmu_total_cycles.attr.attr,
+ &mmdc_pmu_busy_cycles.attr.attr,
+ &mmdc_pmu_read_accesses.attr.attr,
+ &mmdc_pmu_write_accesses.attr.attr,
+ &mmdc_pmu_read_bytes.attr.attr,
+ &mmdc_pmu_read_bytes_unit.attr.attr,
+ &mmdc_pmu_read_bytes_scale.attr.attr,
+ &mmdc_pmu_write_bytes.attr.attr,
+ &mmdc_pmu_write_bytes_unit.attr.attr,
+ &mmdc_pmu_write_bytes_scale.attr.attr,
+ NULL,
+};
+
+static struct attribute_group mmdc_pmu_events_attr_group = {
+ .name = "events",
+ .attrs = mmdc_pmu_events_attrs,
+};
+
+PMU_FORMAT_ATTR(event, "config:0-63");
+static struct attribute *mmdc_pmu_format_attrs[] = {
+ &format_attr_event.attr,
+ NULL,
+};
+
+static struct attribute_group mmdc_pmu_format_attr_group = {
+ .name = "format",
+ .attrs = mmdc_pmu_format_attrs,
+};
+
+static const struct attribute_group *attr_groups[] = {
+ &mmdc_pmu_events_attr_group,
+ &mmdc_pmu_format_attr_group,
+ &mmdc_pmu_cpumask_attr_group,
+ NULL,
+};
+
+static u32 mmdc_pmu_read_counter(struct mmdc_pmu *pmu_mmdc, int cfg)
+{
+ void __iomem *mmdc_base, *reg;
+
+ mmdc_base = pmu_mmdc->mmdc_base;
+
+ switch (cfg) {
+ case TOTAL_CYCLES:
+ reg = mmdc_base + MMDC_MADPSR0;
+ break;
+ case BUSY_CYCLES:
+ reg = mmdc_base + MMDC_MADPSR1;
+ break;
+ case READ_ACCESSES:
+ reg = mmdc_base + MMDC_MADPSR2;
+ break;
+ case WRITE_ACCESSES:
+ reg = mmdc_base + MMDC_MADPSR3;
+ break;
+ case READ_BYTES:
+ reg = mmdc_base + MMDC_MADPSR4;
+ break;
+ case WRITE_BYTES:
+ reg = mmdc_base + MMDC_MADPSR5;
+ break;
+ default:
+ return WARN_ONCE(1,
+ "invalid configuration %d for mmdc counter", cfg);
+ }
+ return readl(reg);
+}
+
+static int mmdc_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
+{
+ struct mmdc_pmu *pmu_mmdc = hlist_entry_safe(node, struct mmdc_pmu, node);
+ int target;
+
+ if (!cpumask_test_and_clear_cpu(cpu, &pmu_mmdc->cpu))
+ return 0;
+
+ target = cpumask_any_but(cpu_online_mask, cpu);
+ if (target >= nr_cpu_ids)
+ return 0;
+
+ perf_pmu_migrate_context(&pmu_mmdc->pmu, cpu, target);
+ cpumask_set_cpu(target, &pmu_mmdc->cpu);
+
+ return 0;
+}
+
+static bool mmdc_pmu_group_event_is_valid(struct perf_event *event,
+ struct pmu *pmu,
+ unsigned long *used_counters)
+{
+ int cfg = event->attr.config;
+
+ if (is_software_event(event))
+ return true;
+
+ if (event->pmu != pmu)
+ return false;
+
+ return !test_and_set_bit(cfg, used_counters);
+}
+
+/*
+ * Each event has a single fixed-purpose counter, so we can only have a
+ * single active event for each at any point in time. Here we just check
+ * for duplicates, and rely on mmdc_pmu_event_init to verify that the HW
+ * event numbers are valid.
+ */
+static bool mmdc_pmu_group_is_valid(struct perf_event *event)
+{
+ struct pmu *pmu = event->pmu;
+ struct perf_event *leader = event->group_leader;
+ struct perf_event *sibling;
+ unsigned long counter_mask = 0;
+
+ set_bit(leader->attr.config, &counter_mask);
+
+ if (event != leader) {
+ if (!mmdc_pmu_group_event_is_valid(event, pmu, &counter_mask))
+ return false;
+ }
+
+ list_for_each_entry(sibling, &leader->sibling_list, group_entry) {
+ if (!mmdc_pmu_group_event_is_valid(sibling, pmu, &counter_mask))
+ return false;
+ }
+
+ return true;
+}
+
+static int mmdc_pmu_event_init(struct perf_event *event)
+{
+ struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
+ int cfg = event->attr.config;
+
+ 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_mmdc->dev, "Can't provide per-task data!\n");
+ return -EOPNOTSUPP;
+ }
+
+ if (event->attr.exclude_user ||
+ event->attr.exclude_kernel ||
+ event->attr.exclude_hv ||
+ event->attr.exclude_idle ||
+ event->attr.exclude_host ||
+ event->attr.exclude_guest ||
+ event->attr.sample_period)
+ return -EINVAL;
+
+ if (cfg < 0 || cfg >= MMDC_NUM_COUNTERS)
+ return -EINVAL;
+
+ if (!mmdc_pmu_group_is_valid(event))
+ return -EINVAL;
+
+ event->cpu = cpumask_first(&pmu_mmdc->cpu);
+ return 0;
+}
+
+static void mmdc_pmu_event_update(struct perf_event *event)
+{
+ struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
+ struct hw_perf_event *hwc = &event->hw;
+ u64 delta, prev_raw_count, new_raw_count;
+
+ do {
+ prev_raw_count = local64_read(&hwc->prev_count);
+ new_raw_count = mmdc_pmu_read_counter(pmu_mmdc,
+ event->attr.config);
+ } while (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
+ new_raw_count) != prev_raw_count);
+
+ delta = (new_raw_count - prev_raw_count) & 0xFFFFFFFF;
+
+ local64_add(delta, &event->count);
+}
+
+static void mmdc_pmu_event_start(struct perf_event *event, int flags)
+{
+ struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
+ struct hw_perf_event *hwc = &event->hw;
+ void __iomem *mmdc_base, *reg;
+
+ mmdc_base = pmu_mmdc->mmdc_base;
+ reg = mmdc_base + MMDC_MADPCR0;
+
+ /*
+ * hrtimer is required because mmdc does not provide an interrupt so
+ * polling is necessary
+ */
+ hrtimer_start(&pmu_mmdc->hrtimer, mmdc_pmu_timer_period(),
+ HRTIMER_MODE_REL_PINNED);
+
+ local64_set(&hwc->prev_count, 0);
+
+ writel(DBG_RST, reg);
+ writel(DBG_EN, reg);
+}
+
+static int mmdc_pmu_event_add(struct perf_event *event, int flags)
+{
+ struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
+ struct hw_perf_event *hwc = &event->hw;
+
+ int cfg = event->attr.config;
+
+ if (flags & PERF_EF_START)
+ mmdc_pmu_event_start(event, flags);
+
+ if (pmu_mmdc->mmdc_events[cfg] != NULL)
+ return -EAGAIN;
+
+ pmu_mmdc->mmdc_events[cfg] = event;
+ pmu_mmdc->active_events++;
+
+ local64_set(&hwc->prev_count, mmdc_pmu_read_counter(pmu_mmdc, cfg));
+
+ return 0;
+}
+
+static void mmdc_pmu_event_stop(struct perf_event *event, int flags)
+{
+ struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
+ void __iomem *mmdc_base, *reg;
+
+ mmdc_base = pmu_mmdc->mmdc_base;
+ reg = mmdc_base + MMDC_MADPCR0;
+
+ writel(PRF_FRZ, reg);
+ mmdc_pmu_event_update(event);
+}
+
+static void mmdc_pmu_event_del(struct perf_event *event, int flags)
+{
+ struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
+ int cfg = event->attr.config;
+
+ pmu_mmdc->mmdc_events[cfg] = NULL;
+ pmu_mmdc->active_events--;
+
+ if (pmu_mmdc->active_events == 0)
+ hrtimer_cancel(&pmu_mmdc->hrtimer);
+
+ mmdc_pmu_event_stop(event, PERF_EF_UPDATE);
+}
+
+static void mmdc_pmu_overflow_handler(struct mmdc_pmu *pmu_mmdc)
+{
+ int i;
+
+ for (i = 0; i < MMDC_NUM_COUNTERS; i++) {
+ struct perf_event *event = pmu_mmdc->mmdc_events[i];
+
+ if (event)
+ mmdc_pmu_event_update(event);
+ }
+}
+
+static enum hrtimer_restart mmdc_pmu_timer_handler(struct hrtimer *hrtimer)
+{
+ struct mmdc_pmu *pmu_mmdc = container_of(hrtimer, struct mmdc_pmu,
+ hrtimer);
+
+ mmdc_pmu_overflow_handler(pmu_mmdc);
+ hrtimer_forward_now(hrtimer, mmdc_pmu_timer_period());
+
+ return HRTIMER_RESTART;
+}
+
+static int mmdc_pmu_init(struct mmdc_pmu *pmu_mmdc,
+ void __iomem *mmdc_base, struct device *dev)
+{
+ int mmdc_num;
+
+ *pmu_mmdc = (struct mmdc_pmu) {
+ .pmu = (struct pmu) {
+ .task_ctx_nr = perf_invalid_context,
+ .attr_groups = attr_groups,
+ .event_init = mmdc_pmu_event_init,
+ .add = mmdc_pmu_event_add,
+ .del = mmdc_pmu_event_del,
+ .start = mmdc_pmu_event_start,
+ .stop = mmdc_pmu_event_stop,
+ .read = mmdc_pmu_event_update,
+ },
+ .mmdc_base = mmdc_base,
+ .dev = dev,
+ .active_events = 0,
+ };
+
+ mmdc_num = ida_simple_get(&mmdc_ida, 0, 0, GFP_KERNEL);
+
+ return mmdc_num;
+}
+
+static int imx_mmdc_remove(struct platform_device *pdev)
+{
+ struct mmdc_pmu *pmu_mmdc = platform_get_drvdata(pdev);
+
+ perf_pmu_unregister(&pmu_mmdc->pmu);
+ cpuhp_remove_state_nocalls(CPUHP_ONLINE);
+ kfree(pmu_mmdc);
+ return 0;
+}
+
+static int imx_mmdc_perf_init(struct platform_device *pdev, void __iomem *mmdc_base)
+{
+ struct mmdc_pmu *pmu_mmdc;
+ char *name;
+ int mmdc_num;
+ int ret;
+
+ pmu_mmdc = kzalloc(sizeof(*pmu_mmdc), GFP_KERNEL);
+ if (!pmu_mmdc) {
+ pr_err("failed to allocate PMU device!\n");
+ return -ENOMEM;
+ }
+
+ mmdc_num = mmdc_pmu_init(pmu_mmdc, mmdc_base, &pdev->dev);
+ if (mmdc_num == 0)
+ name = "mmdc";
+ else
+ name = devm_kasprintf(&pdev->dev,
+ GFP_KERNEL, "mmdc%d", mmdc_num);
+
+ hrtimer_init(&pmu_mmdc->hrtimer, CLOCK_MONOTONIC,
+ HRTIMER_MODE_REL);
+ pmu_mmdc->hrtimer.function = mmdc_pmu_timer_handler;
+
+ cpuhp_state_add_instance_nocalls(CPUHP_ONLINE,
+ &pmu_mmdc->node);
+ cpumask_set_cpu(smp_processor_id(), &pmu_mmdc->cpu);
+ ret = cpuhp_setup_state_multi(CPUHP_AP_NOTIFY_ONLINE,
+ "MMDC_ONLINE", NULL,
+ mmdc_pmu_offline_cpu);
+ if (ret) {
+ pr_err("cpuhp_setup_state_multi failure\n");
+ goto pmu_register_err;
+ }
+
+ ret = perf_pmu_register(&(pmu_mmdc->pmu), name, -1);
+ platform_set_drvdata(pdev, pmu_mmdc);
+ if (ret)
+ goto pmu_register_err;
+ return 0;
+
+pmu_register_err:
+ pr_warn("MMDC Perf PMU failed (%d), disabled\n", ret);
+ hrtimer_cancel(&pmu_mmdc->hrtimer);
+ kfree(pmu_mmdc);
+ return ret;
+}
+
+#else
+#define imx_mmdc_remove NULL
+#define imx_mmdc_perf_init(pdev, mmdc_base) 0
+#endif
+
static int imx_mmdc_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
return -EBUSY;
}
- return 0;
+ return imx_mmdc_perf_init(pdev, mmdc_base);
}
int imx_mmdc_get_ddr_type(void)
.of_match_table = imx_mmdc_dt_ids,
},
.probe = imx_mmdc_probe,
+ .remove = imx_mmdc_remove,
};
static int __init imx_mmdc_init(void)
projects / linux-2.6-microblaze.git / blobdiff