Re: [PATCH v6 6/7] perf: imx_perf: add support for i.MX95 platform

[Frank Li]

On Thu, Mar 07, 2024 at 05:57:29PM +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,axi_mask=ID_MASK,axi_id=ID/
> ~# perf stat -a -I 1000 -e imx9_ddr0/eddrtq_pm_rd_beat_filt1,axi_mask=ID_MASK,axi_id=ID/
> ~# perf stat -a -I 1000 -e imx9_ddr0/eddrtq_pm_rd_beat_filt0,axi_mask=ID_MASK,axi_id=ID/
> eg: For edma2: perf stat -a -I 1000 -e imx9_ddr0/eddrtq_pm_rd_beat_filt0,axi_mask=0x00f,axi_id=0x00c/
> 
> For write beat:
> ~# perf stat -a -I 1000 -e imx9_ddr0/eddrtq_pm_wr_beat_filt,axi_mask=ID_MASK,axi_id=ID/
> eg: For edma2: perf stat -a -I 1000 -e imx9_ddr0/eddrtq_pm_wr_beat_filt,axi_mask=0x00f,axi_id=0x00c/
> 
> Signed-off-by: Xu Yang <xu.yang_2@xxxxxxx>
> 
> ---
> 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
> Changes in v6:
>  - no changes
> ---
>  drivers/perf/fsl_imx9_ddr_perf.c | 93 ++++++++++++++++++++++++++++++--
>  1 file changed, 90 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/perf/fsl_imx9_ddr_perf.c b/drivers/perf/fsl_imx9_ddr_perf.c
> index 52234b97d0cb..a91267e2f5d8 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 */
> @@ -77,13 +87,23 @@ 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);
> @@ -192,6 +212,7 @@ static struct attribute *ddr_perf_events_attrs[] = {
>  	IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_7, ID(2, 71)),
>  	IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_empty, ID(2, 72)),
>  	IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_trans_filt, ID(2, 73)),	/* imx93 specific*/
> +	IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_wr_beat_filt, ID(2, 73)),	/* imx95 specific*/
>  
>  	/* counter3 specific events */
>  	IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_0, ID(3, 64)),
> @@ -204,6 +225,7 @@ static struct attribute *ddr_perf_events_attrs[] = {
>  	IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_7, ID(3, 71)),
>  	IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_full, ID(3, 72)),
>  	IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_wr_trans_filt, ID(3, 73)),	/* imx93 specific*/
> +	IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_beat_filt2, ID(3, 73)),	/* imx95 specific*/
>  
>  	/* counter4 specific events */
>  	IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_0, ID(4, 64)),
> @@ -216,6 +238,7 @@ static struct attribute *ddr_perf_events_attrs[] = {
>  	IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_7, ID(4, 71)),
>  	IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_ld_rdq2_rmw, ID(4, 72)),
>  	IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_beat_filt, ID(4, 73)),	/* imx93 specific*/
> +	IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_beat_filt1, ID(4, 73)),	/* imx95 specific*/
>  
>  	/* counter5 specific events */
>  	IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_0, ID(5, 64)),
> @@ -227,6 +250,7 @@ static struct attribute *ddr_perf_events_attrs[] = {
>  	IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_6, ID(5, 70)),
>  	IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_7, ID(5, 71)),
>  	IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_ld_rdq1, ID(5, 72)),
> +	IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_beat_filt0, ID(5, 73)),	/* imx95 specific*/
>  
>  	/* counter6 specific events */
>  	IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_end_0, ID(6, 64)),
> @@ -263,6 +287,13 @@ 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;
>  }
>  
> @@ -434,6 +465,57 @@ static void imx93_ddr_perf_monitor_config(struct ddr_pmu *pmu, int event,
>  	writel_relaxed(pmcfg2, pmu->base + PMCFG2);
>  }
>  
> +static void imx95_ddr_perf_monitor_config(struct ddr_pmu *pmu, int event,
> +					  int counter, int axi_id, int axi_mask)
> +{
> +	u32 pmcfg1, pmcfg, offset = 0;
> +
> +	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;
> +		}
> +	}

Look like only if event = 73, FILTER need be set.

How about

	pmcfg1 &= ~(MX95_PMCFG1_WR_BEAT_FILT_EN | MX95_PMCFG1_RD_BEAT_FILT_EN);
	if (event == 73)
		switch()
			...

So you need "else" branch.


> +
> +	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, axi_mask) |
> +			  FIELD_PREP(MX95_PMCFG_ID, axi_id));
> +		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);
> @@ -543,8 +625,13 @@ 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, event_id, counter, cfg1, cfg2);
> +	if (is_imx93(pmu))
> +		/* read trans, write trans, read beat */
> +		imx93_ddr_perf_monitor_config(pmu, event_id, counter, cfg1, cfg2);
> +
> +	if (is_imx95(pmu))
> +		/* write beat, read beat2, read beat1, read beat */
> +		imx95_ddr_perf_monitor_config(pmu, event_id, counter, cfg1, cfg2);
>  
>  	if (flags & PERF_EF_START)
>  		ddr_perf_event_start(event, flags);
> -- 
> 2.34.1
>