/*
- * Copyright 2011,2016 Freescale Semiconductor, Inc.
+ * Copyright 2011 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 imx_mmdc_perf_init(pdev, mmdc_base);
+ return 0;
}
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)
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