by Frank Li

[permalink] [raw]

Subject: Re: [PATCH v5 5/7] perf: imx_perf: add support for i.MX95 platform

On Thu, Mar 07, 2024 at 10:47:52AM +0800, Xu Yang wrote:
> i.MX95 has a DDR PMU which is almostly same as i.MX93, it now supports
> read beat and write beat filter capabilities. This will add support for
> i.MX95 and enhance the driver to support specific filter handling for it.
>
> Usage:
>
> For read beat:
> ~# perf stat -a -I 1000 -e imx9_ddr0/eddrtq_pm_rd_beat_filt2,counter=3,axi_mask=ID_MASK,axi_id=ID/

Why need 'counter'? it should be auto allocated according to event
mx9_ddr0/eddrtq_pm_rd_beat_filt2.

Frank

> ~# perf stat -a -I 1000 -e imx9_ddr0/eddrtq_pm_rd_beat_filt1,counter=4,axi_mask=ID_MASK,axi_id=ID/
> ~# perf stat -a -I 1000 -e imx9_ddr0/eddrtq_pm_rd_beat_filt0,counter=5,axi_mask=ID_MASK,axi_id=ID/
> eg: For edma2: perf stat -a -I 1000 -e imx9_ddr0/eddrtq_pm_rd_beat_filt0,counter=5,axi_mask=0x00f,axi_id=0x00c/
>
> For write beat:
> ~# perf stat -a -I 1000 -e imx9_ddr0/eddrtq_pm_wr_beat_filt,counter=2,axi_mask=ID_MASK,axi_id=ID/
> eg: For edma2: perf stat -a -I 1000 -e imx9_ddr0/eddrtq_pm_wr_beat_filt,counter=2,axi_mask=0x00f,axi_id=0x00c/
>
> Signed-off-by: Xu Yang <[email protected]>
>
> ---
> Changes in v2:
> - put soc spefific axi filter events to drvdata according
> to franks suggestions.
> - adjust pmcfg axi_id and axi_mask config
> Changes in v3:
> - no changes
> Changes in v4:
> - only contain imx95 parts
> Changes in v5:
> - improve imx95_ddr_perf_monitor_config()
> - use write_relaxed to pair read_relaxed
> ---
> drivers/perf/fsl_imx9_ddr_perf.c | 96 +++++++++++++++++++++++++++++++-
> 1 file changed, 93 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/perf/fsl_imx9_ddr_perf.c b/drivers/perf/fsl_imx9_ddr_perf.c
> index 35e422083948..f25f55126004 100644
> --- a/drivers/perf/fsl_imx9_ddr_perf.c
> +++ b/drivers/perf/fsl_imx9_ddr_perf.c
> @@ -17,9 +17,19 @@
> #define MX93_PMCFG1_RD_BT_FILT_EN BIT(29)
> #define MX93_PMCFG1_ID_MASK GENMASK(17, 0)
>
> +#define MX95_PMCFG1_WR_BEAT_FILT_EN BIT(31)
> +#define MX95_PMCFG1_RD_BEAT_FILT_EN BIT(30)
> +
> #define PMCFG2 0x04
> #define MX93_PMCFG2_ID GENMASK(17, 0)
>
> +#define PMCFG3 0x08
> +#define PMCFG4 0x0C
> +#define PMCFG5 0x10
> +#define PMCFG6 0x14
> +#define MX95_PMCFG_ID_MASK GENMASK(9, 0)
> +#define MX95_PMCFG_ID GENMASK(25, 16)
> +
> /* Global control register affects all counters and takes priority over local control registers */
> #define PMGC0 0x40
> /* Global control register bits */
> @@ -76,13 +86,23 @@ static const struct imx_ddr_devtype_data imx93_devtype_data = {
> .identifier = "imx93",
> };
>
> +static const struct imx_ddr_devtype_data imx95_devtype_data = {
> + .identifier = "imx95",
> +};
> +
> static inline bool is_imx93(struct ddr_pmu *pmu)
> {
> return pmu->devtype_data == &imx93_devtype_data;
> }
>
> +static inline bool is_imx95(struct ddr_pmu *pmu)
> +{
> + return pmu->devtype_data == &imx95_devtype_data;
> +}
> +
> static const struct of_device_id imx_ddr_pmu_dt_ids[] = {
> - {.compatible = "fsl,imx93-ddr-pmu", .data = &imx93_devtype_data},
> + { .compatible = "fsl,imx93-ddr-pmu", .data = &imx93_devtype_data },
> + { .compatible = "fsl,imx95-ddr-pmu", .data = &imx95_devtype_data },
> { /* sentinel */ }
> };
> MODULE_DEVICE_TABLE(of, imx_ddr_pmu_dt_ids);
> @@ -189,6 +209,7 @@ static struct attribute *ddr_perf_events_attrs[] = {
> IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_7, 71),
> IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_empty, 72),
> IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_trans_filt, 73), /* imx93 specific*/
> + IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_wr_beat_filt, 73), /* imx95 specific*/
>
> /* counter3 specific events */
> IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_0, 64),
> @@ -201,6 +222,7 @@ static struct attribute *ddr_perf_events_attrs[] = {
> IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_7, 71),
> IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_full, 72),
> IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_wr_trans_filt, 73), /* imx93 specific*/
> + IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_beat_filt2, 73), /* imx95 specific*/
>
> /* counter4 specific events */
> IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_0, 64),
> @@ -213,6 +235,7 @@ static struct attribute *ddr_perf_events_attrs[] = {
> IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_7, 71),
> IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_ld_rdq2_rmw, 72),
> IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_beat_filt, 73), /* imx93 specific*/
> + IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_beat_filt1, 73), /* imx95 specific*/
>
> /* counter5 specific events */
> IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_0, 64),
> @@ -224,6 +247,7 @@ static struct attribute *ddr_perf_events_attrs[] = {
> IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_6, 70),
> IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_7, 71),
> IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_ld_rdq1, 72),
> + IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_beat_filt0, 73), /* imx95 specific*/
>
> /* counter6 specific events */
> IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_end_0, 64),
> @@ -260,6 +284,13 @@ ddr_perf_events_attrs_is_visible(struct kobject *kobj,
> !is_imx93(ddr_pmu))
> return 0;
>
> + if ((!strcmp(attr->name, "eddrtq_pm_wr_beat_filt") ||
> + !strcmp(attr->name, "eddrtq_pm_rd_beat_filt2") ||
> + !strcmp(attr->name, "eddrtq_pm_rd_beat_filt1") ||
> + !strcmp(attr->name, "eddrtq_pm_rd_beat_filt0")) &&
> + !is_imx95(ddr_pmu))
> + return 0;
> +
> return attr->mode;
> }
>
> @@ -425,6 +456,60 @@ static void imx93_ddr_perf_monitor_config(struct ddr_pmu *pmu, int cfg, int cfg1
> writel(pmcfg2, pmu->base + PMCFG2);
> }
>
> +static void imx95_ddr_perf_monitor_config(struct ddr_pmu *pmu, int cfg, int cfg1, int cfg2)
> +{
> + u32 pmcfg1, pmcfg, offset = 0;
> + int event, counter;
> +
> + event = (cfg & CONFIG_EVENT_MASK) >> CONFIG_EVENT_OFFSET;
> + counter = (cfg & CONFIG_COUNTER_MASK) >> CONFIG_COUNTER_OFFSET;
> +
> + pmcfg1 = readl_relaxed(pmu->base + PMCFG1);
> +
> + if (event == 73) {
> + switch (counter) {
> + case 2:
> + pmcfg1 |= MX95_PMCFG1_WR_BEAT_FILT_EN;
> + offset = PMCFG3;
> + break;
> + case 3:
> + pmcfg1 |= MX95_PMCFG1_RD_BEAT_FILT_EN;
> + offset = PMCFG4;
> + break;
> + case 4:
> + pmcfg1 |= MX95_PMCFG1_RD_BEAT_FILT_EN;
> + offset = PMCFG5;
> + break;
> + case 5:
> + pmcfg1 |= MX95_PMCFG1_RD_BEAT_FILT_EN;
> + offset = PMCFG6;
> + break;
> + }
> + } else {
> + switch (counter) {
> + case 2:
> + pmcfg1 &= ~MX95_PMCFG1_WR_BEAT_FILT_EN;
> + break;
> + case 3:
> + case 4:
> + case 5:
> + pmcfg1 &= ~MX95_PMCFG1_RD_BEAT_FILT_EN;
> + break;
> + }
> + }
> +
> + writel_relaxed(pmcfg1, pmu->base + PMCFG1);
> +
> + if (offset) {
> + pmcfg = readl_relaxed(pmu->base + offset);
> + pmcfg &= ~(FIELD_PREP(MX95_PMCFG_ID_MASK, 0x3FF) |
> + FIELD_PREP(MX95_PMCFG_ID, 0x3FF));
> + pmcfg |= (FIELD_PREP(MX95_PMCFG_ID_MASK, cfg2) |
> + FIELD_PREP(MX95_PMCFG_ID, cfg1));
> + writel_relaxed(pmcfg, pmu->base + offset);
> + }
> +}
> +
> static void ddr_perf_event_update(struct perf_event *event)
> {
> struct ddr_pmu *pmu = to_ddr_pmu(event->pmu);
> @@ -505,8 +590,13 @@ static int ddr_perf_event_add(struct perf_event *event, int flags)
> hwc->idx = counter;
> hwc->state |= PERF_HES_STOPPED;
>
> - /* read trans, write trans, read beat */
> - imx93_ddr_perf_monitor_config(pmu, cfg, cfg1, cfg2);
> + if (is_imx93(pmu))
> + /* read trans, write trans, read beat */
> + imx93_ddr_perf_monitor_config(pmu, cfg, cfg1, cfg2);
> +
> + if (is_imx95(pmu))
> + /* write beat, read beat2, read beat1, read beat */
> + imx95_ddr_perf_monitor_config(pmu, cfg, cfg1, cfg2);
>
> if (flags & PERF_EF_START)
> ddr_perf_event_start(event, flags);
> --
> 2.34.1
>