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SubjectRe: [PATCH v8 2/2] ThunderX2, perf : Add Cavium ThunderX2 SoC UNCORE PMU driver
On Thu, Nov 22, 2018 at 03:04:35AM +0000, Kulkarni, Ganapatrao wrote:
> This patch adds a perf driver for the PMU UNCORE devices DDR4 Memory
> Controller(DMC) and Level 3 Cache(L3C). Each PMU supports up to 4
> counters. All counters lack overflow interrupt and are
> sampled periodically.
>
> Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulkarni@cavium.com>
> ---
> drivers/perf/Kconfig | 9 +
> drivers/perf/Makefile | 1 +
> drivers/perf/thunderx2_pmu.c | 869 +++++++++++++++++++++++++++++++++++
> include/linux/cpuhotplug.h | 1 +
> 4 files changed, 880 insertions(+)
> create mode 100644 drivers/perf/thunderx2_pmu.c
>
> diff --git a/drivers/perf/Kconfig b/drivers/perf/Kconfig
> index 08ebaf7cca8b..af9bc178495d 100644
> --- a/drivers/perf/Kconfig
> +++ b/drivers/perf/Kconfig
> @@ -87,6 +87,15 @@ config QCOM_L3_PMU
> Adds the L3 cache PMU into the perf events subsystem for
> monitoring L3 cache events.
>
> +config THUNDERX2_PMU
> + tristate "Cavium ThunderX2 SoC PMU UNCORE"
> + depends on ARCH_THUNDER2 && ARM64 && ACPI && NUMA
> + default m
> + help
> + Provides support for ThunderX2 UNCORE events.
> + The SoC has PMU support in its L3 cache controller (L3C) and
> + in the DDR4 Memory Controller (DMC).
> +
> config XGENE_PMU
> depends on ARCH_XGENE
> bool "APM X-Gene SoC PMU"
> diff --git a/drivers/perf/Makefile b/drivers/perf/Makefile
> index b3902bd37d53..909f27fd9db3 100644
> --- a/drivers/perf/Makefile
> +++ b/drivers/perf/Makefile
> @@ -7,5 +7,6 @@ obj-$(CONFIG_ARM_PMU_ACPI) += arm_pmu_acpi.o
> obj-$(CONFIG_HISI_PMU) += hisilicon/
> obj-$(CONFIG_QCOM_L2_PMU) += qcom_l2_pmu.o
> obj-$(CONFIG_QCOM_L3_PMU) += qcom_l3_pmu.o
> +obj-$(CONFIG_THUNDERX2_PMU) += thunderx2_pmu.o
> obj-$(CONFIG_XGENE_PMU) += xgene_pmu.o
> obj-$(CONFIG_ARM_SPE_PMU) += arm_spe_pmu.o
> diff --git a/drivers/perf/thunderx2_pmu.c b/drivers/perf/thunderx2_pmu.c
> new file mode 100644
> index 000000000000..e6509ba868ab
> --- /dev/null
> +++ b/drivers/perf/thunderx2_pmu.c
> @@ -0,0 +1,869 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * CAVIUM THUNDERX2 SoC PMU UNCORE
> + * Copyright (C) 2018 Cavium Inc.
> + * Author: Ganapatrao Kulkarni <gkulkarni@cavium.com>
> + */
> +
> +#include <linux/acpi.h>
> +#include <linux/cpuhotplug.h>
> +#include <linux/perf_event.h>
> +#include <linux/platform_device.h>
> +
> +/* Each ThunderX2(TX2) Socket has a L3C and DMC UNCORE PMU device.
> + * Each UNCORE PMU device consists of 4 independent programmable counters.
> + * Counters are 32 bit and do not support overflow interrupt,
> + * they need to be sampled before overflow(i.e, at every 2 seconds).
> + */
> +
> +#define TX2_PMU_MAX_COUNTERS 4
> +#define TX2_PMU_DMC_CHANNELS 8
> +#define TX2_PMU_L3_TILES 16
> +
> +#define TX2_PMU_HRTIMER_INTERVAL (2 * NSEC_PER_SEC)
> +#define GET_EVENTID(ev) ((ev->hw.config) & 0x1ff)
I think this should be 0x1f.

> +#define GET_COUNTERID(ev) ((ev->hw.idx) & 0x3)
> + /* 1 byte per counter(4 counters).
> + * Event id is encoded in bits [5:1] of a byte,
> + */
> +#define DMC_EVENT_CFG(idx, val) ((val) << (((idx) * 8) + 1))
> +
> +#define L3C_COUNTER_CTL 0xA8
> +#define L3C_COUNTER_DATA 0xAC
> +#define DMC_COUNTER_CTL 0x234
> +#define DMC_COUNTER_DATA 0x240
> +
> +/* L3C event IDs */
> +#define L3_EVENT_READ_REQ 0xD
> +#define L3_EVENT_WRITEBACK_REQ 0xE
> +#define L3_EVENT_INV_N_WRITE_REQ 0xF
> +#define L3_EVENT_INV_REQ 0x10
> +#define L3_EVENT_EVICT_REQ 0x13
> +#define L3_EVENT_INV_N_WRITE_HIT 0x14
> +#define L3_EVENT_INV_HIT 0x15
> +#define L3_EVENT_READ_HIT 0x17
> +#define L3_EVENT_MAX 0x18
> +
> +/* DMC event IDs */
> +#define DMC_EVENT_COUNT_CYCLES 0x1
> +#define DMC_EVENT_WRITE_TXNS 0xB
> +#define DMC_EVENT_DATA_TRANSFERS 0xD
> +#define DMC_EVENT_READ_TXNS 0xF
> +#define DMC_EVENT_MAX 0x10
> +
> +enum tx2_uncore_type {
> + PMU_TYPE_L3C,
> + PMU_TYPE_DMC,
> + PMU_TYPE_INVALID,
> +};
> +
> +/*
> + * pmu on each socket has 2 uncore devices(dmc and l3c),
> + * each device has 4 counters.
> + */
> +struct tx2_uncore_pmu {
> + struct hlist_node hpnode;
> + struct list_head entry;
> + struct pmu pmu;
> + char *name;
> + int node;
> + int cpu;
> + u32 max_counters;
> + u32 prorate_factor;
> + u32 max_events;
> + u64 hrtimer_interval;
> + void __iomem *base;
> + DECLARE_BITMAP(active_counters, TX2_PMU_MAX_COUNTERS);
> + struct perf_event *events[TX2_PMU_MAX_COUNTERS];
> + struct device *dev;
> + struct hrtimer hrtimer;
> + const struct attribute_group **attr_groups;
> + enum tx2_uncore_type type;
> + void (*init_cntr_base)(struct perf_event *event,
> + struct tx2_uncore_pmu *tx2_pmu);
> + void (*stop_event)(struct perf_event *event);
> + void (*start_event)(struct perf_event *event, int flags);
> +};
> +
> +static LIST_HEAD(tx2_pmus);
> +
> +static inline struct tx2_uncore_pmu *pmu_to_tx2_pmu(struct pmu *pmu)
> +{
> + return container_of(pmu, struct tx2_uncore_pmu, pmu);
> +}
> +
> +/*
> + * sysfs format attributes
> + */
> +static ssize_t tx2_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);
> +}
> +
> +#define FORMAT_ATTR(_name, _config) \
> + (&((struct dev_ext_attribute[]) { \
> + { \
> + .attr = __ATTR(_name, 0444, tx2_pmu_format_show, NULL), \
> + .var = (void *) _config, \
> + } \
> + })[0].attr.attr)
> +
> +static struct attribute *l3c_pmu_format_attrs[] = {
> + FORMAT_ATTR(event, "config:0-4"),
> + NULL,
> +};
> +
> +static struct attribute *dmc_pmu_format_attrs[] = {
> + FORMAT_ATTR(event, "config:0-4"),
> + NULL,
> +};

We have PMU_FORMAT_ATTR, PMU_EVENT_ATTR etc in the core code to help here.
Please try to use them.

> +static const struct attribute_group l3c_pmu_format_attr_group = {
> + .name = "format",
> + .attrs = l3c_pmu_format_attrs,
> +};
> +
> +static const struct attribute_group dmc_pmu_format_attr_group = {
> + .name = "format",
> + .attrs = dmc_pmu_format_attrs,
> +};
> +
> +/*
> + * sysfs event attributes
> + */
> +static ssize_t tx2_pmu_event_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, "config=0x%lx\n", (unsigned long) eattr->var);
> +}

Shouldn't this be "event=" instead of "config="?

Will

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