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![Tiberiu Breana](/assets/img/avatar_default.png)
Add support for an extra config parameter for perf commands: axi_id, which will be written in the MMDC's MADPCR1 register, to filter memory usage profiling (see i.MX6 reference manual, chapter 44.7 MMDC Profiling for AXI id usage). Signed-off-by: Tiberiu Breana <andrei-tiberiu.breana@nxp.com> Acked-by: Frank Li <Frank.li@nxp.com> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
599 lines
15 KiB
C
599 lines
15 KiB
C
/*
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* Copyright 2017 NXP
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* Copyright 2011,2016 Freescale Semiconductor, Inc.
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* Copyright 2011 Linaro Ltd.
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*
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* The code contained herein is licensed under the GNU General Public
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* License. You may obtain a copy of the GNU General Public License
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* Version 2 or later at the following locations:
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*
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* http://www.opensource.org/licenses/gpl-license.html
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* http://www.gnu.org/copyleft/gpl.html
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*/
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#include <linux/hrtimer.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/perf_event.h>
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#include <linux/slab.h>
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#include "common.h"
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#define MMDC_MAPSR 0x404
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#define BP_MMDC_MAPSR_PSD 0
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#define BP_MMDC_MAPSR_PSS 4
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#define MMDC_MDMISC 0x18
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#define BM_MMDC_MDMISC_DDR_TYPE 0x18
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#define BP_MMDC_MDMISC_DDR_TYPE 0x3
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#define TOTAL_CYCLES 0x0
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#define BUSY_CYCLES 0x1
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#define READ_ACCESSES 0x2
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#define WRITE_ACCESSES 0x3
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#define READ_BYTES 0x4
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#define WRITE_BYTES 0x5
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/* Enables, resets, freezes, overflow profiling*/
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#define DBG_DIS 0x0
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#define DBG_EN 0x1
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#define DBG_RST 0x2
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#define PRF_FRZ 0x4
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#define CYC_OVF 0x8
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#define PROFILE_SEL 0x10
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#define MMDC_MADPCR0 0x410
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#define MMDC_MADPCR1 0x414
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#define MMDC_MADPSR0 0x418
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#define MMDC_MADPSR1 0x41C
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#define MMDC_MADPSR2 0x420
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#define MMDC_MADPSR3 0x424
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#define MMDC_MADPSR4 0x428
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#define MMDC_MADPSR5 0x42C
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#define MMDC_NUM_COUNTERS 6
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#define MMDC_FLAG_PROFILE_SEL 0x1
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#define MMDC_PRF_AXI_ID_CLEAR 0x0
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#define to_mmdc_pmu(p) container_of(p, struct mmdc_pmu, pmu)
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static int ddr_type;
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struct fsl_mmdc_devtype_data {
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unsigned int flags;
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};
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static const struct fsl_mmdc_devtype_data imx6q_data = {
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};
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static const struct fsl_mmdc_devtype_data imx6qp_data = {
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.flags = MMDC_FLAG_PROFILE_SEL,
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};
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static const struct of_device_id imx_mmdc_dt_ids[] = {
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{ .compatible = "fsl,imx6q-mmdc", .data = (void *)&imx6q_data},
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{ .compatible = "fsl,imx6qp-mmdc", .data = (void *)&imx6qp_data},
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{ /* sentinel */ }
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};
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#ifdef CONFIG_PERF_EVENTS
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static enum cpuhp_state cpuhp_mmdc_state;
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static DEFINE_IDA(mmdc_ida);
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PMU_EVENT_ATTR_STRING(total-cycles, mmdc_pmu_total_cycles, "event=0x00")
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PMU_EVENT_ATTR_STRING(busy-cycles, mmdc_pmu_busy_cycles, "event=0x01")
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PMU_EVENT_ATTR_STRING(read-accesses, mmdc_pmu_read_accesses, "event=0x02")
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PMU_EVENT_ATTR_STRING(write-accesses, mmdc_pmu_write_accesses, "event=0x03")
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PMU_EVENT_ATTR_STRING(read-bytes, mmdc_pmu_read_bytes, "event=0x04")
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PMU_EVENT_ATTR_STRING(read-bytes.unit, mmdc_pmu_read_bytes_unit, "MB");
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PMU_EVENT_ATTR_STRING(read-bytes.scale, mmdc_pmu_read_bytes_scale, "0.000001");
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PMU_EVENT_ATTR_STRING(write-bytes, mmdc_pmu_write_bytes, "event=0x05")
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PMU_EVENT_ATTR_STRING(write-bytes.unit, mmdc_pmu_write_bytes_unit, "MB");
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PMU_EVENT_ATTR_STRING(write-bytes.scale, mmdc_pmu_write_bytes_scale, "0.000001");
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struct mmdc_pmu {
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struct pmu pmu;
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void __iomem *mmdc_base;
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cpumask_t cpu;
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struct hrtimer hrtimer;
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unsigned int active_events;
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struct device *dev;
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struct perf_event *mmdc_events[MMDC_NUM_COUNTERS];
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struct hlist_node node;
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struct fsl_mmdc_devtype_data *devtype_data;
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};
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/*
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* Polling period is set to one second, overflow of total-cycles (the fastest
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* increasing counter) takes ten seconds so one second is safe
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*/
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static unsigned int mmdc_pmu_poll_period_us = 1000000;
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module_param_named(pmu_pmu_poll_period_us, mmdc_pmu_poll_period_us, uint,
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S_IRUGO | S_IWUSR);
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static ktime_t mmdc_pmu_timer_period(void)
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{
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return ns_to_ktime((u64)mmdc_pmu_poll_period_us * 1000);
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}
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static ssize_t mmdc_pmu_cpumask_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mmdc_pmu *pmu_mmdc = dev_get_drvdata(dev);
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return cpumap_print_to_pagebuf(true, buf, &pmu_mmdc->cpu);
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}
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static struct device_attribute mmdc_pmu_cpumask_attr =
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__ATTR(cpumask, S_IRUGO, mmdc_pmu_cpumask_show, NULL);
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static struct attribute *mmdc_pmu_cpumask_attrs[] = {
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&mmdc_pmu_cpumask_attr.attr,
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NULL,
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};
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static struct attribute_group mmdc_pmu_cpumask_attr_group = {
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.attrs = mmdc_pmu_cpumask_attrs,
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};
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static struct attribute *mmdc_pmu_events_attrs[] = {
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&mmdc_pmu_total_cycles.attr.attr,
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&mmdc_pmu_busy_cycles.attr.attr,
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&mmdc_pmu_read_accesses.attr.attr,
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&mmdc_pmu_write_accesses.attr.attr,
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&mmdc_pmu_read_bytes.attr.attr,
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&mmdc_pmu_read_bytes_unit.attr.attr,
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&mmdc_pmu_read_bytes_scale.attr.attr,
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&mmdc_pmu_write_bytes.attr.attr,
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&mmdc_pmu_write_bytes_unit.attr.attr,
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&mmdc_pmu_write_bytes_scale.attr.attr,
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NULL,
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};
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static struct attribute_group mmdc_pmu_events_attr_group = {
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.name = "events",
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.attrs = mmdc_pmu_events_attrs,
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};
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PMU_FORMAT_ATTR(event, "config:0-63");
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PMU_FORMAT_ATTR(axi_id, "config1:0-63");
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static struct attribute *mmdc_pmu_format_attrs[] = {
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&format_attr_event.attr,
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&format_attr_axi_id.attr,
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NULL,
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};
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static struct attribute_group mmdc_pmu_format_attr_group = {
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.name = "format",
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.attrs = mmdc_pmu_format_attrs,
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};
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static const struct attribute_group *attr_groups[] = {
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&mmdc_pmu_events_attr_group,
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&mmdc_pmu_format_attr_group,
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&mmdc_pmu_cpumask_attr_group,
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NULL,
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};
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static u32 mmdc_pmu_read_counter(struct mmdc_pmu *pmu_mmdc, int cfg)
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{
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void __iomem *mmdc_base, *reg;
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mmdc_base = pmu_mmdc->mmdc_base;
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switch (cfg) {
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case TOTAL_CYCLES:
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reg = mmdc_base + MMDC_MADPSR0;
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break;
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case BUSY_CYCLES:
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reg = mmdc_base + MMDC_MADPSR1;
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break;
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case READ_ACCESSES:
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reg = mmdc_base + MMDC_MADPSR2;
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break;
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case WRITE_ACCESSES:
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reg = mmdc_base + MMDC_MADPSR3;
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break;
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case READ_BYTES:
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reg = mmdc_base + MMDC_MADPSR4;
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break;
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case WRITE_BYTES:
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reg = mmdc_base + MMDC_MADPSR5;
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break;
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default:
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return WARN_ONCE(1,
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"invalid configuration %d for mmdc counter", cfg);
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}
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return readl(reg);
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}
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static int mmdc_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
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{
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struct mmdc_pmu *pmu_mmdc = hlist_entry_safe(node, struct mmdc_pmu, node);
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int target;
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if (!cpumask_test_and_clear_cpu(cpu, &pmu_mmdc->cpu))
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return 0;
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target = cpumask_any_but(cpu_online_mask, cpu);
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if (target >= nr_cpu_ids)
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return 0;
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perf_pmu_migrate_context(&pmu_mmdc->pmu, cpu, target);
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cpumask_set_cpu(target, &pmu_mmdc->cpu);
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return 0;
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}
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static bool mmdc_pmu_group_event_is_valid(struct perf_event *event,
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struct pmu *pmu,
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unsigned long *used_counters)
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{
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int cfg = event->attr.config;
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if (is_software_event(event))
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return true;
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if (event->pmu != pmu)
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return false;
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return !test_and_set_bit(cfg, used_counters);
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}
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/*
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* Each event has a single fixed-purpose counter, so we can only have a
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* single active event for each at any point in time. Here we just check
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* for duplicates, and rely on mmdc_pmu_event_init to verify that the HW
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* event numbers are valid.
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*/
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static bool mmdc_pmu_group_is_valid(struct perf_event *event)
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{
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struct pmu *pmu = event->pmu;
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struct perf_event *leader = event->group_leader;
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struct perf_event *sibling;
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unsigned long counter_mask = 0;
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set_bit(leader->attr.config, &counter_mask);
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if (event != leader) {
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if (!mmdc_pmu_group_event_is_valid(event, pmu, &counter_mask))
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return false;
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}
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list_for_each_entry(sibling, &leader->sibling_list, group_entry) {
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if (!mmdc_pmu_group_event_is_valid(sibling, pmu, &counter_mask))
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return false;
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}
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return true;
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}
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static int mmdc_pmu_event_init(struct perf_event *event)
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{
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struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
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int cfg = event->attr.config;
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if (event->attr.type != event->pmu->type)
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return -ENOENT;
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if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK)
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return -EOPNOTSUPP;
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if (event->cpu < 0) {
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dev_warn(pmu_mmdc->dev, "Can't provide per-task data!\n");
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return -EOPNOTSUPP;
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}
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if (event->attr.exclude_user ||
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event->attr.exclude_kernel ||
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event->attr.exclude_hv ||
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event->attr.exclude_idle ||
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event->attr.exclude_host ||
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event->attr.exclude_guest ||
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event->attr.sample_period)
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return -EINVAL;
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if (cfg < 0 || cfg >= MMDC_NUM_COUNTERS)
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return -EINVAL;
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if (!mmdc_pmu_group_is_valid(event))
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return -EINVAL;
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event->cpu = cpumask_first(&pmu_mmdc->cpu);
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return 0;
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}
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static void mmdc_pmu_event_update(struct perf_event *event)
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{
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struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
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struct hw_perf_event *hwc = &event->hw;
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u64 delta, prev_raw_count, new_raw_count;
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do {
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prev_raw_count = local64_read(&hwc->prev_count);
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new_raw_count = mmdc_pmu_read_counter(pmu_mmdc,
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event->attr.config);
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} while (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
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new_raw_count) != prev_raw_count);
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delta = (new_raw_count - prev_raw_count) & 0xFFFFFFFF;
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local64_add(delta, &event->count);
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}
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static void mmdc_pmu_event_start(struct perf_event *event, int flags)
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{
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struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
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struct hw_perf_event *hwc = &event->hw;
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void __iomem *mmdc_base, *reg;
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u32 val;
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mmdc_base = pmu_mmdc->mmdc_base;
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reg = mmdc_base + MMDC_MADPCR0;
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/*
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* hrtimer is required because mmdc does not provide an interrupt so
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* polling is necessary
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*/
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hrtimer_start(&pmu_mmdc->hrtimer, mmdc_pmu_timer_period(),
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HRTIMER_MODE_REL_PINNED);
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local64_set(&hwc->prev_count, 0);
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writel(DBG_RST, reg);
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/*
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* Write the AXI id parameter to MADPCR1.
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*/
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val = event->attr.config1;
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reg = mmdc_base + MMDC_MADPCR1;
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writel(val, reg);
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reg = mmdc_base + MMDC_MADPCR0;
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val = DBG_EN;
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if (pmu_mmdc->devtype_data->flags & MMDC_FLAG_PROFILE_SEL)
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val |= PROFILE_SEL;
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writel(val, reg);
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}
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static int mmdc_pmu_event_add(struct perf_event *event, int flags)
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{
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struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
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struct hw_perf_event *hwc = &event->hw;
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int cfg = event->attr.config;
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if (flags & PERF_EF_START)
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mmdc_pmu_event_start(event, flags);
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if (pmu_mmdc->mmdc_events[cfg] != NULL)
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return -EAGAIN;
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pmu_mmdc->mmdc_events[cfg] = event;
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pmu_mmdc->active_events++;
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local64_set(&hwc->prev_count, mmdc_pmu_read_counter(pmu_mmdc, cfg));
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return 0;
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}
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static void mmdc_pmu_event_stop(struct perf_event *event, int flags)
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{
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struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
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void __iomem *mmdc_base, *reg;
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mmdc_base = pmu_mmdc->mmdc_base;
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reg = mmdc_base + MMDC_MADPCR0;
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writel(PRF_FRZ, reg);
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reg = mmdc_base + MMDC_MADPCR1;
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writel(MMDC_PRF_AXI_ID_CLEAR, reg);
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mmdc_pmu_event_update(event);
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}
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static void mmdc_pmu_event_del(struct perf_event *event, int flags)
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{
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struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
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int cfg = event->attr.config;
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pmu_mmdc->mmdc_events[cfg] = NULL;
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pmu_mmdc->active_events--;
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if (pmu_mmdc->active_events == 0)
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hrtimer_cancel(&pmu_mmdc->hrtimer);
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mmdc_pmu_event_stop(event, PERF_EF_UPDATE);
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}
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static void mmdc_pmu_overflow_handler(struct mmdc_pmu *pmu_mmdc)
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{
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int i;
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for (i = 0; i < MMDC_NUM_COUNTERS; i++) {
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struct perf_event *event = pmu_mmdc->mmdc_events[i];
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if (event)
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mmdc_pmu_event_update(event);
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}
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}
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static enum hrtimer_restart mmdc_pmu_timer_handler(struct hrtimer *hrtimer)
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{
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struct mmdc_pmu *pmu_mmdc = container_of(hrtimer, struct mmdc_pmu,
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hrtimer);
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mmdc_pmu_overflow_handler(pmu_mmdc);
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hrtimer_forward_now(hrtimer, mmdc_pmu_timer_period());
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return HRTIMER_RESTART;
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}
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static int mmdc_pmu_init(struct mmdc_pmu *pmu_mmdc,
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void __iomem *mmdc_base, struct device *dev)
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{
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int mmdc_num;
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*pmu_mmdc = (struct mmdc_pmu) {
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.pmu = (struct pmu) {
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.task_ctx_nr = perf_invalid_context,
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.attr_groups = attr_groups,
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.event_init = mmdc_pmu_event_init,
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.add = mmdc_pmu_event_add,
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.del = mmdc_pmu_event_del,
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.start = mmdc_pmu_event_start,
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.stop = mmdc_pmu_event_stop,
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.read = mmdc_pmu_event_update,
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},
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.mmdc_base = mmdc_base,
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.dev = dev,
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.active_events = 0,
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};
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mmdc_num = ida_simple_get(&mmdc_ida, 0, 0, GFP_KERNEL);
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return mmdc_num;
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}
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static int imx_mmdc_remove(struct platform_device *pdev)
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{
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struct mmdc_pmu *pmu_mmdc = platform_get_drvdata(pdev);
|
|
|
|
cpuhp_state_remove_instance_nocalls(cpuhp_mmdc_state, &pmu_mmdc->node);
|
|
perf_pmu_unregister(&pmu_mmdc->pmu);
|
|
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;
|
|
const struct of_device_id *of_id =
|
|
of_match_device(imx_mmdc_dt_ids, &pdev->dev);
|
|
|
|
pmu_mmdc = kzalloc(sizeof(*pmu_mmdc), GFP_KERNEL);
|
|
if (!pmu_mmdc) {
|
|
pr_err("failed to allocate PMU device!\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* The first instance registers the hotplug state */
|
|
if (!cpuhp_mmdc_state) {
|
|
ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN,
|
|
"perf/arm/mmdc:online", NULL,
|
|
mmdc_pmu_offline_cpu);
|
|
if (ret < 0) {
|
|
pr_err("cpuhp_setup_state_multi failed\n");
|
|
goto pmu_free;
|
|
}
|
|
cpuhp_mmdc_state = ret;
|
|
}
|
|
|
|
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);
|
|
|
|
pmu_mmdc->devtype_data = (struct fsl_mmdc_devtype_data *)of_id->data;
|
|
|
|
hrtimer_init(&pmu_mmdc->hrtimer, CLOCK_MONOTONIC,
|
|
HRTIMER_MODE_REL);
|
|
pmu_mmdc->hrtimer.function = mmdc_pmu_timer_handler;
|
|
|
|
cpumask_set_cpu(raw_smp_processor_id(), &pmu_mmdc->cpu);
|
|
|
|
/* Register the pmu instance for cpu hotplug */
|
|
cpuhp_state_add_instance_nocalls(cpuhp_mmdc_state, &pmu_mmdc->node);
|
|
|
|
ret = perf_pmu_register(&(pmu_mmdc->pmu), name, -1);
|
|
if (ret)
|
|
goto pmu_register_err;
|
|
|
|
platform_set_drvdata(pdev, pmu_mmdc);
|
|
return 0;
|
|
|
|
pmu_register_err:
|
|
pr_warn("MMDC Perf PMU failed (%d), disabled\n", ret);
|
|
cpuhp_state_remove_instance_nocalls(cpuhp_mmdc_state, &pmu_mmdc->node);
|
|
hrtimer_cancel(&pmu_mmdc->hrtimer);
|
|
pmu_free:
|
|
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;
|
|
void __iomem *mmdc_base, *reg;
|
|
u32 val;
|
|
int timeout = 0x400;
|
|
|
|
mmdc_base = of_iomap(np, 0);
|
|
WARN_ON(!mmdc_base);
|
|
|
|
reg = mmdc_base + MMDC_MDMISC;
|
|
/* Get ddr type */
|
|
val = readl_relaxed(reg);
|
|
ddr_type = (val & BM_MMDC_MDMISC_DDR_TYPE) >>
|
|
BP_MMDC_MDMISC_DDR_TYPE;
|
|
|
|
reg = mmdc_base + MMDC_MAPSR;
|
|
|
|
/* Enable automatic power saving */
|
|
val = readl_relaxed(reg);
|
|
val &= ~(1 << BP_MMDC_MAPSR_PSD);
|
|
writel_relaxed(val, reg);
|
|
|
|
/* Ensure it's successfully enabled */
|
|
while (!(readl_relaxed(reg) & 1 << BP_MMDC_MAPSR_PSS) && --timeout)
|
|
cpu_relax();
|
|
|
|
if (unlikely(!timeout)) {
|
|
pr_warn("%s: failed to enable automatic power saving\n",
|
|
__func__);
|
|
return -EBUSY;
|
|
}
|
|
|
|
return imx_mmdc_perf_init(pdev, mmdc_base);
|
|
}
|
|
|
|
int imx_mmdc_get_ddr_type(void)
|
|
{
|
|
return ddr_type;
|
|
}
|
|
|
|
static struct platform_driver imx_mmdc_driver = {
|
|
.driver = {
|
|
.name = "imx-mmdc",
|
|
.of_match_table = imx_mmdc_dt_ids,
|
|
},
|
|
.probe = imx_mmdc_probe,
|
|
.remove = imx_mmdc_remove,
|
|
};
|
|
|
|
static int __init imx_mmdc_init(void)
|
|
{
|
|
return platform_driver_register(&imx_mmdc_driver);
|
|
}
|
|
postcore_initcall(imx_mmdc_init);
|