RE: [PATCH 2/3] perf: imx_perf: add support for i.MX95 platform

Frank Li
2023-11-27T15:25:32Z

> -----Original Message-----
> From: Xu Yang <xu.yang_2@nxp.com>
> Sent: Monday, November 27, 2023 1:32 AM
> To: Frank Li <frank.li@nxp.com>; will@kernel.org; mark.rutland@arm.com;
> robh+dt@kernel.org; krzysztof.kozlowski+dt@linaro.org;
> conor+dt@kernel.org; shawnguo@kernel.org; s.hauer@pengutronix.de;
> kernel@pengutronix.de; festevam@gmail.com; irogers@google.com;
> namhyung@kernel.org; acme@kernel.org; john.g.garry@oracle.com
> Cc: james.clark@arm.com; mike.leach@linaro.org; leo.yan@linaro.org;
> peterz@infradead.org; mingo@redhat.com;
> alexander.shishkin@linux.intel.com; linux-arm-kernel@lists.infradead.org;
> devicetree@vger.kernel.org; linux-perf-users@vger.kernel.org; linux-
> kernel@vger.kernel.org
> Subject: [PATCH 2/3] perf: imx_perf: add support for i.MX95 platform
>
> 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/
> ~# 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=0x0
> 0c/
>
> 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=0x00
> c/
>
> Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
> ---
> drivers/perf/fsl_imx9_ddr_perf.c | 187 +++++++++++++++++++++++++++--
> --
> 1 file changed, 164 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/perf/fsl_imx9_ddr_perf.c
> b/drivers/perf/fsl_imx9_ddr_perf.c
> index 5cf770a1bc31..5e531d94cf3b 100644
> --- a/drivers/perf/fsl_imx9_ddr_perf.c
> +++ b/drivers/perf/fsl_imx9_ddr_perf.c
> @@ -11,14 +11,24 @@
> #include <linux/perf_event.h>
>
> /* Performance monitor configuration */
> -#define PMCFG1 0x00
> -#define PMCFG1_RD_TRANS_FILT_EN BIT(31)
> -#define PMCFG1_WR_TRANS_FILT_EN BIT(30)
> -#define PMCFG1_RD_BT_FILT_EN BIT(29)
> -#define PMCFG1_ID_MASK GENMASK(17, 0)
> +#define PMCFG1 0x00
> +#define MX93_PMCFG1_RD_TRANS_FILT_EN BIT(31)
> +#define MX93_PMCFG1_WR_TRANS_FILT_EN BIT(30)
> +#define MX93_PMCFG1_RD_BT_FILT_EN BIT(29)
> +#define MX93_PMCFG1_ID_MASK GENMASK(17, 0)
>
> -#define PMCFG2 0x04
> -#define PMCFG2_ID 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
> @@ -71,12 +81,22 @@ 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 const struct of_device_id imx_ddr_pmu_dt_ids[] = {
> {.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);
>
> +static inline bool is_imx93(struct ddr_pmu *pmu)
> +{
> + return pmu->devtype_data == &imx93_devtype_data;
> +}
> +
> static ssize_t ddr_perf_identifier_show(struct device *dev,
> struct device_attribute *attr,
> char *page)
> @@ -178,7 +198,6 @@ static struct attribute *ddr_perf_events_attrs[] = {
> IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_6, 70),
> 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),
>
> /* counter3 specific events */
> IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_0, 64),
> @@ -190,7 +209,6 @@ static struct attribute *ddr_perf_events_attrs[] = {
> IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_6, 70),
> 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),
>
> /* counter4 specific events */
> IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_0, 64),
> @@ -202,7 +220,6 @@ static struct attribute *ddr_perf_events_attrs[] = {
> IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_6, 70),
> 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),
>
> /* counter5 specific events */
> IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_0, 64),
> @@ -242,6 +259,26 @@ static const struct attribute_group
> ddr_perf_events_attr_group = {
> .attrs = ddr_perf_events_attrs,
> };
>
> +static struct attribute *imx93_ddr_perf_events_attrs[] = {
> + /* counter2 specific events */
> + IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_trans_filt, 73),
> + /* counter3 specific events */
> + IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_wr_trans_filt, 73),
> + /* counter4 specific events */
> + IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_beat_filt, 73),
> +};
> +
> +static struct attribute *imx95_ddr_perf_events_attrs[] = {
> + /* counter2 specific events */
> + IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_wr_beat_filt, 73),
> + /* counter3 specific events */
> + IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_beat_filt2, 73),
> + /* counter4 specific events */
> + IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_beat_filt1, 73),
> + /* counter5 specific events */
> + IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_beat_filt0, 73),
> +};
> +
> PMU_FORMAT_ATTR(event, "config:0-7");
> PMU_FORMAT_ATTR(counter, "config:8-15");
> PMU_FORMAT_ATTR(axi_id, "config1:0-17");
> @@ -361,7 +398,7 @@ static void ddr_perf_counter_local_config(struct
> ddr_pmu *pmu, int config,
> }
> }
>
> -static void ddr_perf_monitor_config(struct ddr_pmu *pmu, int cfg, int cfg1,
> int cfg2)
> +static void imx93_ddr_perf_monitor_config(struct ddr_pmu *pmu, int cfg,
> int cfg1, int cfg2)
> {
> u32 pmcfg1, pmcfg2;
> int event, counter;
> @@ -372,30 +409,80 @@ static void ddr_perf_monitor_config(struct
> ddr_pmu *pmu, int cfg, int cfg1, int
> pmcfg1 = readl_relaxed(pmu->base + PMCFG1);
>
> if (counter == 2 && event == 73)
> - pmcfg1 |= PMCFG1_RD_TRANS_FILT_EN;
> + pmcfg1 |= MX93_PMCFG1_RD_TRANS_FILT_EN;
> else if (counter == 2 && event != 73)
> - pmcfg1 &= ~PMCFG1_RD_TRANS_FILT_EN;
> + pmcfg1 &= ~MX93_PMCFG1_RD_TRANS_FILT_EN;
>
> if (counter == 3 && event == 73)
> - pmcfg1 |= PMCFG1_WR_TRANS_FILT_EN;
> + pmcfg1 |= MX93_PMCFG1_WR_TRANS_FILT_EN;
> else if (counter == 3 && event != 73)
> - pmcfg1 &= ~PMCFG1_WR_TRANS_FILT_EN;
> + pmcfg1 &= ~MX93_PMCFG1_WR_TRANS_FILT_EN;
>
> if (counter == 4 && event == 73)
> - pmcfg1 |= PMCFG1_RD_BT_FILT_EN;
> + pmcfg1 |= MX93_PMCFG1_RD_BT_FILT_EN;
> else if (counter == 4 && event != 73)
> - pmcfg1 &= ~PMCFG1_RD_BT_FILT_EN;
> + pmcfg1 &= ~MX93_PMCFG1_RD_BT_FILT_EN;
>
> - pmcfg1 &= ~FIELD_PREP(PMCFG1_ID_MASK, 0x3FFFF);
> - pmcfg1 |= FIELD_PREP(PMCFG1_ID_MASK, cfg2);
> + pmcfg1 &= ~FIELD_PREP(MX93_PMCFG1_ID_MASK, 0x3FFFF);
> + pmcfg1 |= FIELD_PREP(MX93_PMCFG1_ID_MASK, cfg2);
> writel(pmcfg1, pmu->base + PMCFG1);
>
> pmcfg2 = readl_relaxed(pmu->base + PMCFG2);
> - pmcfg2 &= ~FIELD_PREP(PMCFG2_ID, 0x3FFFF);
> - pmcfg2 |= FIELD_PREP(PMCFG2_ID, cfg1);
> + pmcfg2 &= ~FIELD_PREP(MX93_PMCFG2_ID, 0x3FFFF);
> + pmcfg2 |= FIELD_PREP(MX93_PMCFG2_ID, cfg1);

Suggest created a sperate rename patch, which prepare for IMX95.

Frank

> 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 & 0x000000FF;
> + counter = (cfg & 0x0000FF00) >> 8;
> +
> + pmcfg1 = readl_relaxed(pmu->base + PMCFG1);
> +
> + if (counter == 2 && event == 73) {
> + pmcfg1 |= MX95_PMCFG1_WR_BEAT_FILT_EN;
> + offset = PMCFG3;
> + } else if (counter == 2 && event != 73) {
> + pmcfg1 &= ~MX95_PMCFG1_WR_BEAT_FILT_EN;
> + }
> +
> + if (counter == 3 && event == 73) {
> + pmcfg1 |= MX95_PMCFG1_RD_BEAT_FILT_EN;
> + offset = PMCFG4;
> + } else if (counter == 3 && event != 73) {
> + pmcfg1 &= ~MX95_PMCFG1_RD_BEAT_FILT_EN;
> + }
> +
> + if (counter == 4 && event == 73) {
> + pmcfg1 |= MX95_PMCFG1_RD_BEAT_FILT_EN;
> + offset = PMCFG5;
> + } else if (counter == 4 && event != 73) {
> + pmcfg1 &= ~MX95_PMCFG1_RD_BEAT_FILT_EN;
> + }
> +
> + if (counter == 5 && event == 73) {
> + pmcfg1 |= MX95_PMCFG1_RD_BEAT_FILT_EN;
> + offset = PMCFG6;
> + } else if (counter == 5 && event != 73) {
> + pmcfg1 &= ~MX95_PMCFG1_RD_BEAT_FILT_EN;
> + }
> +
> + writel(pmcfg1, pmu->base + PMCFG1);
> +
> + if (offset) {
> + pmcfg = readl_relaxed(pmu->base + offset);
> + pmcfg &= ~FIELD_PREP(MX95_PMCFG_ID_MASK, 0x3FF);
> + pmcfg |= FIELD_PREP(MX95_PMCFG_ID_MASK, cfg2);
> + pmcfg &= ~FIELD_PREP(MX95_PMCFG_ID, 0x3FF);

It should be reductant.

> + pmcfg |= FIELD_PREP(MX95_PMCFG_ID, cfg1);
> + writel(pmcfg, pmu->base + offset);
> + }
> +}
> +
> static void ddr_perf_event_update(struct perf_event *event)
> {
> struct ddr_pmu *pmu = to_ddr_pmu(event->pmu);
> @@ -479,8 +566,13 @@ static int ddr_perf_event_add(struct perf_event
> *event, int flags)
> if (flags & PERF_EF_START)
> ddr_perf_event_start(event, flags);
>
> - /* read trans, write trans, read beat */
> - 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);
> + } else {
> + /* write beat, read beat2, read beat1, read beat */
> + imx95_ddr_perf_monitor_config(pmu, cfg, cfg1, cfg2);
> + }

Did you run checkpatch? no "{" need?, not sure have comments case.
>
> return 0;
> }
> @@ -596,6 +688,49 @@ static int ddr_perf_offline_cpu(unsigned int cpu,
> struct hlist_node *node)
> return 0;
> }
>
> +static int ddr_perf_add_events(struct ddr_pmu *pmu)
> +{
> + int i, ret, events;
> + struct attribute **attrs;
> + struct device *pmu_dev = pmu->pmu.dev;
> +
> + if (is_imx93(pmu)) {
> + events = sizeof(imx93_ddr_perf_events_attrs)/sizeof(struct
> attribute *);
> + attrs = imx93_ddr_perf_events_attrs;
> + } else {
> + events = sizeof(imx95_ddr_perf_events_attrs)/sizeof(struct
> attribute *);
> + attrs = imx95_ddr_perf_events_attrs;
> + }

Can you put "attrs" and "events" into drvdata?

> +
> + for (i = 0; i < events; i++) {
> + ret = sysfs_add_file_to_group(&pmu_dev->kobj, attrs[i],
> "events");
> + if (ret) {
> + dev_warn(pmu->dev, "i.MX9 DDR Perf add events
> failed (%d)\n", ret);
> + return ret;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static void ddr_perf_remove_events(struct ddr_pmu *pmu)
> +{
> + int i, events;
> + struct attribute **attrs;
> + struct device *pmu_dev = pmu->pmu.dev;
> +
> + if (is_imx93(pmu)) {
> + events = sizeof(imx93_ddr_perf_events_attrs)/sizeof(struct
> attribute *);
> + attrs = imx93_ddr_perf_events_attrs;
> + } else {
> + events = sizeof(imx95_ddr_perf_events_attrs)/sizeof(struct
> attribute *);
> + attrs = imx95_ddr_perf_events_attrs;
> + }

Can you put "attrs" and "events" into drvdata?

> +
> + for (i = 0; i < events; i++)
> + sysfs_remove_file_from_group(&pmu_dev->kobj, attrs[i],
> "events");
> +}
> +
> static int ddr_perf_probe(struct platform_device *pdev)
> {
> struct ddr_pmu *pmu;
> @@ -666,6 +801,10 @@ static int ddr_perf_probe(struct platform_device
> *pdev)
> if (ret)
> goto ddr_perf_err;
>
> + ret = ddr_perf_add_events(pmu);
> + if (ret)
> + dev_warn(&pdev->dev, "i.MX9 DDR Perf filter events are
> missing\n");
> +
> return 0;
>
> ddr_perf_err:
> @@ -683,6 +822,8 @@ static int ddr_perf_remove(struct platform_device
> *pdev)
> {
> struct ddr_pmu *pmu = platform_get_drvdata(pdev);
>
> + ddr_perf_remove_events(pmu);
> +
> cpuhp_state_remove_instance_nocalls(pmu->cpuhp_state, &pmu-
> >node);
> cpuhp_remove_multi_state(pmu->cpuhp_state);
>
> --
> 2.34.1