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    Subject[PATCH v2 3/4] perf/imx_ddr: Add system PMU identifier for userspace
    Date
    From: Joakim Zhang <qiangqing.zhang@nxp.com>

    The DDR Perf for i.MX8 is a system PMU whose AXI ID would different from
    SoC to SoC. Need expose system PMU identifier for userspace which refer
    to /sys/bus/event_source/devices/<PMU DEVICE>/identifier.

    Reviewed-by: John Garry <john.garry@huawei.com>
    Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
    Signed-off-by: John Garry <john.garry@huawei.com>
    ---
    drivers/perf/fsl_imx8_ddr_perf.c | 45 +++++++++++++++++++++++++++++---
    1 file changed, 42 insertions(+), 3 deletions(-)

    diff --git a/drivers/perf/fsl_imx8_ddr_perf.c b/drivers/perf/fsl_imx8_ddr_perf.c
    index 397540a4b799..c537cd9b8142 100644
    --- a/drivers/perf/fsl_imx8_ddr_perf.c
    +++ b/drivers/perf/fsl_imx8_ddr_perf.c
    @@ -50,21 +50,38 @@ static DEFINE_IDA(ddr_ida);

    struct fsl_ddr_devtype_data {
    unsigned int quirks; /* quirks needed for different DDR Perf core */
    + const char *identifier; /* system PMU identifier for userspace */
    };

    -static const struct fsl_ddr_devtype_data imx8_devtype_data;
    +static const struct fsl_ddr_devtype_data imx8_devtype_data = {
    + .identifier = "i.MX8",
    +};
    +
    +static const struct fsl_ddr_devtype_data imx8mq_devtype_data = {
    + .quirks = DDR_CAP_AXI_ID_FILTER,
    + .identifier = "i.MX8MQ",
    +};
    +
    +static const struct fsl_ddr_devtype_data imx8mm_devtype_data = {
    + .quirks = DDR_CAP_AXI_ID_FILTER,
    + .identifier = "i.MX8MM",
    +};

    -static const struct fsl_ddr_devtype_data imx8m_devtype_data = {
    +static const struct fsl_ddr_devtype_data imx8mn_devtype_data = {
    .quirks = DDR_CAP_AXI_ID_FILTER,
    + .identifier = "i.MX8MN",
    };

    static const struct fsl_ddr_devtype_data imx8mp_devtype_data = {
    .quirks = DDR_CAP_AXI_ID_FILTER_ENHANCED,
    + .identifier = "i.MX8MP",
    };

    static const struct of_device_id imx_ddr_pmu_dt_ids[] = {
    { .compatible = "fsl,imx8-ddr-pmu", .data = &imx8_devtype_data},
    - { .compatible = "fsl,imx8m-ddr-pmu", .data = &imx8m_devtype_data},
    + { .compatible = "fsl,imx8mq-ddr-pmu", .data = &imx8mq_devtype_data},
    + { .compatible = "fsl,imx8mm-ddr-pmu", .data = &imx8mm_devtype_data},
    + { .compatible = "fsl,imx8mn-ddr-pmu", .data = &imx8mn_devtype_data},
    { .compatible = "fsl,imx8mp-ddr-pmu", .data = &imx8mp_devtype_data},
    { /* sentinel */ }
    };
    @@ -84,6 +101,27 @@ struct ddr_pmu {
    int id;
    };

    +static ssize_t ddr_perf_identifier_show(struct device *dev,
    + struct device_attribute *attr,
    + char *page)
    +{
    + struct ddr_pmu *pmu = dev_get_drvdata(dev);
    +
    + return sprintf(page, "%s\n", pmu->devtype_data->identifier);
    +}
    +
    +static struct device_attribute ddr_perf_identifier_attr =
    + __ATTR(identifier, 0444, ddr_perf_identifier_show, NULL);
    +
    +static struct attribute *ddr_perf_identifier_attrs[] = {
    + &ddr_perf_identifier_attr.attr,
    + NULL,
    +};
    +
    +static struct attribute_group ddr_perf_identifier_attr_group = {
    + .attrs = ddr_perf_identifier_attrs,
    +};
    +
    enum ddr_perf_filter_capabilities {
    PERF_CAP_AXI_ID_FILTER = 0,
    PERF_CAP_AXI_ID_FILTER_ENHANCED,
    @@ -237,6 +275,7 @@ static const struct attribute_group *attr_groups[] = {
    &ddr_perf_format_attr_group,
    &ddr_perf_cpumask_attr_group,
    &ddr_perf_filter_cap_attr_group,
    + &ddr_perf_identifier_attr_group,
    NULL,
    };

    --
    2.26.2
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