Re: [PATCH v2 5/8] coresight-tpdm: Add pattern registers support for CMB

From: James Clark
Date: Mon Oct 30 2023 - 07:33:12 EST

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On 25/10/2023 03:53, Tao Zhang wrote:
> Timestamps are requested if the monitor’s CMB data set unit input
> data matches the value in the Monitor CMB timestamp pattern and mask
> registers (M_CMB_TPR and M_CMB_TPMR) when CMB timestamp enabled
> via the timestamp insertion enable register bit(CMB_TIER.PATT_TSENAB).
> The pattern match trigger output is achieved via setting values into
> the CMB trigger pattern and mask registers (CMB_XPR and CMB_XPMR).
> After configuring a pattern through these registers, the TPDM subunit
> will assert an output trigger every time it receives new input data
> that matches the configured pattern value. Values in a given bit
> number of the mask register correspond to the same bit number in
> the corresponding pattern register.
>
> Signed-off-by: Tao Zhang <quic_taozha@xxxxxxxxxxx>
> Signed-off-by: Jinlong Mao <quic_jinlmao@xxxxxxxxxxx>

Reviewed-by: James Clark <james.clark@xxxxxxx>

> ---
> .../ABI/testing/sysfs-bus-coresight-devices-tpdm | 30 ++++++++
> drivers/hwtracing/coresight/coresight-tpdm.c | 88 +++++++++++++++++++++-
> drivers/hwtracing/coresight/coresight-tpdm.h | 39 ++++++++++
> 3 files changed, 156 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> index ace7231..c17468f 100644
> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> @@ -180,3 +180,33 @@ Description: (Write) Set the data collection mode of CMB tpdm.
> Accepts only one of the 2 values - 0 or 1.
> 0 : Continuous CMB collection mode.
> 1 : Trace-on-change CMB collection mode.
> +
> +What: /sys/bus/coresight/devices/<tpdm-name>/cmb_trig_patt/xpr[0:1]
> +Date: March 2023
> +KernelVersion 6.7
> +Contact: Jinlong Mao (QUIC) <quic_jinlmao@xxxxxxxxxxx>, Tao Zhang (QUIC) <quic_taozha@xxxxxxxxxxx>
> +Description:
> + (RW) Set/Get the value of the trigger pattern for the CMB
> + subunit TPDM.
> +
> +What: /sys/bus/coresight/devices/<tpdm-name>/cmb_trig_patt/xpmr[0:1]
> +Date: March 2023
> +KernelVersion 6.7
> +Contact: Jinlong Mao (QUIC) <quic_jinlmao@xxxxxxxxxxx>, Tao Zhang (QUIC) <quic_taozha@xxxxxxxxxxx>
> +Description:
> + (RW) Set/Get the mask of the trigger pattern for the CMB
> + subunit TPDM.
> +
> +What: /sys/bus/coresight/devices/<tpdm-name>/dsb_patt/tpr[0:1]
> +Date: March 2023
> +KernelVersion 6.7
> +Contact: Jinlong Mao (QUIC) <quic_jinlmao@xxxxxxxxxxx>, Tao Zhang (QUIC) <quic_taozha@xxxxxxxxxxx>
> +Description:
> + (RW) Set/Get the value of the pattern for the CMB subunit TPDM.
> +
> +What: /sys/bus/coresight/devices/<tpdm-name>/dsb_patt/tpmr[0:1]
> +Date: March 2023
> +KernelVersion 6.7
> +Contact: Jinlong Mao (QUIC) <quic_jinlmao@xxxxxxxxxxx>, Tao Zhang (QUIC) <quic_taozha@xxxxxxxxxxx>
> +Description:
> + (RW) Set/Get the mask of the pattern for the CMB subunit TPDM.
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
> index efb376e..894d430 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
> @@ -66,6 +66,26 @@ static ssize_t tpdm_simple_dataset_show(struct device *dev,
> return -EINVAL;
> return sysfs_emit(buf, "0x%x\n",
> drvdata->dsb->msr[tpdm_attr->idx]);
> + case CMB_TRIG_PATT:
> + if (tpdm_attr->idx >= TPDM_CMB_MAX_PATT)
> + return -EINVAL;
> + return sysfs_emit(buf, "0x%x\n",
> + drvdata->cmb->trig_patt[tpdm_attr->idx]);
> + case CMB_TRIG_PATT_MASK:
> + if (tpdm_attr->idx >= TPDM_CMB_MAX_PATT)
> + return -EINVAL;
> + return sysfs_emit(buf, "0x%x\n",
> + drvdata->cmb->trig_patt_mask[tpdm_attr->idx]);
> + case CMB_PATT:
> + if (tpdm_attr->idx >= TPDM_CMB_MAX_PATT)
> + return -EINVAL;
> + return sysfs_emit(buf, "0x%x\n",
> + drvdata->cmb->patt_val[tpdm_attr->idx]);
> + case CMB_PATT_MASK:
> + if (tpdm_attr->idx >= TPDM_CMB_MAX_PATT)
> + return -EINVAL;
> + return sysfs_emit(buf, "0x%x\n",
> + drvdata->cmb->patt_mask[tpdm_attr->idx]);
> }
> return -EINVAL;
> }
> @@ -118,6 +138,30 @@ static ssize_t tpdm_simple_dataset_store(struct device *dev,
> else
> ret = -EINVAL;
> break;
> + case CMB_TRIG_PATT:
> + if (tpdm_attr->idx < TPDM_CMB_MAX_PATT)
> + drvdata->cmb->trig_patt[tpdm_attr->idx] = val;
> + else
> + ret = -EINVAL;
> + break;
> + case CMB_TRIG_PATT_MASK:
> + if (tpdm_attr->idx < TPDM_CMB_MAX_PATT)
> + drvdata->cmb->trig_patt_mask[tpdm_attr->idx] = val;
> + else
> + ret = -EINVAL;
> + break;
> + case CMB_PATT:
> + if (tpdm_attr->idx < TPDM_CMB_MAX_PATT)
> + drvdata->cmb->patt_val[tpdm_attr->idx] = val;
> + else
> + ret = -EINVAL;
> + break;
> + case CMB_PATT_MASK:
> + if (tpdm_attr->idx < TPDM_CMB_MAX_PATT)
> + drvdata->cmb->patt_mask[tpdm_attr->idx] = val;
> + else
> + ret = -EINVAL;
> + break;
> default:
> ret = -EINVAL;
> }
> @@ -289,7 +333,19 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>
> static void tpdm_enable_cmb(struct tpdm_drvdata *drvdata)
> {
> - u32 val;
> + u32 val, i;
> +
> + /* Configure pattern registers */
> + for (i = 0; i < TPDM_CMB_MAX_PATT; i++) {
> + writel_relaxed(drvdata->cmb->patt_val[i],
> + drvdata->base + TPDM_CMB_TPR(i));
> + writel_relaxed(drvdata->cmb->patt_mask[i],
> + drvdata->base + TPDM_CMB_TPMR(i));
> + writel_relaxed(drvdata->cmb->trig_patt[i],
> + drvdata->base + TPDM_CMB_XPR(i));
> + writel_relaxed(drvdata->cmb->trig_patt_mask[i],
> + drvdata->base + TPDM_CMB_XPMR(i));
> + }
>
> val = readl_relaxed(drvdata->base + TPDM_CMB_CR);
> /*
> @@ -904,6 +960,22 @@ static struct attribute *tpdm_dsb_msr_attrs[] = {
> NULL,
> };
>
> +static struct attribute *tpdm_cmb_trig_patt_attrs[] = {
> + CMB_TRIG_PATT_ATTR(0),
> + CMB_TRIG_PATT_ATTR(1),
> + CMB_TRIG_PATT_MASK_ATTR(0),
> + CMB_TRIG_PATT_MASK_ATTR(1),
> + NULL,
> +};
> +
> +static struct attribute *tpdm_cmb_patt_attrs[] = {
> + CMB_PATT_ATTR(0),
> + CMB_PATT_ATTR(1),
> + CMB_PATT_MASK_ATTR(0),
> + CMB_PATT_MASK_ATTR(1),
> + NULL,
> +};
> +
> static struct attribute *tpdm_dsb_attrs[] = {
> &dev_attr_dsb_mode.attr,
> &dev_attr_dsb_trig_ts.attr,
> @@ -950,6 +1022,18 @@ static struct attribute_group tpdm_cmb_attr_grp = {
> .is_visible = tpdm_cmb_is_visible,
> };
>
> +static struct attribute_group tpdm_cmb_trig_patt_grp = {
> + .attrs = tpdm_cmb_trig_patt_attrs,
> + .is_visible = tpdm_cmb_is_visible,
> + .name = "cmb_trig_patt",
> +};
> +
> +static struct attribute_group tpdm_cmb_patt_grp = {
> + .attrs = tpdm_cmb_patt_attrs,
> + .is_visible = tpdm_cmb_is_visible,
> + .name = "cmb_patt",
> +};
> +
> static const struct attribute_group *tpdm_attr_grps[] = {
> &tpdm_attr_grp,
> &tpdm_dsb_attr_grp,
> @@ -958,6 +1042,8 @@ static const struct attribute_group *tpdm_attr_grps[] = {
> &tpdm_dsb_patt_grp,
> &tpdm_dsb_msr_grp,
> &tpdm_cmb_attr_grp,
> + &tpdm_cmb_trig_patt_grp,
> + &tpdm_cmb_patt_grp,
> NULL,
> };
>
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtracing/coresight/coresight-tpdm.h
> index c6b36d2..e90d008c 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.h
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.h
> @@ -11,12 +11,23 @@
>
> /* CMB Subunit Registers */
> #define TPDM_CMB_CR (0xA00)
> +/*CMB subunit timestamp pattern registers*/
> +#define TPDM_CMB_TPR(n) (0xA08 + (n * 4))
> +/*CMB subunit timestamp pattern mask registers*/
> +#define TPDM_CMB_TPMR(n) (0xA10 + (n * 4))
> +/*CMB subunit trigger pattern registers*/
> +#define TPDM_CMB_XPR(n) (0xA18 + (n * 4))
> +/*CMB subunit trigger pattern mask registers*/
> +#define TPDM_CMB_XPMR(n) (0xA20 + (n * 4))
>
> /* Enable bit for CMB subunit */
> #define TPDM_CMB_CR_ENA BIT(0)
> /* Trace collection mode for CMB subunit */
> #define TPDM_CMB_CR_MODE BIT(1)
>
> +/*Patten register number*/
> +#define TPDM_CMB_MAX_PATT 2
> +
> /* DSB Subunit Registers */
> #define TPDM_DSB_CR (0x780)
> #define TPDM_DSB_TIER (0x784)
> @@ -151,6 +162,22 @@
> tpdm_simple_dataset_rw(msr##nr, \
> DSB_MSR, nr)
>
> +#define CMB_TRIG_PATT_ATTR(nr) \
> + tpdm_simple_dataset_rw(xpr##nr, \
> + CMB_TRIG_PATT, nr)
> +
> +#define CMB_TRIG_PATT_MASK_ATTR(nr) \
> + tpdm_simple_dataset_rw(xpmr##nr, \
> + CMB_TRIG_PATT_MASK, nr)
> +
> +#define CMB_PATT_ATTR(nr) \
> + tpdm_simple_dataset_rw(tpr##nr, \
> + CMB_PATT, nr)
> +
> +#define CMB_PATT_MASK_ATTR(nr) \
> + tpdm_simple_dataset_rw(tpmr##nr, \
> + CMB_PATT_MASK, nr)
> +
> /**
> * struct dsb_dataset - specifics associated to dsb dataset
> * @mode: DSB programming mode
> @@ -186,9 +213,17 @@ struct dsb_dataset {
> /**
> * struct cmb_dataset
> * @trace_mode: Dataset collection mode
> + * @patt_val: Save value for pattern
> + * @patt_mask: Save value for pattern mask
> + * @trig_patt: Save value for trigger pattern
> + * @trig_patt_mask: Save value for trigger pattern mask
> */
> struct cmb_dataset {
> u32 trace_mode;
> + u32 patt_val[TPDM_CMB_MAX_PATT];
> + u32 patt_mask[TPDM_CMB_MAX_PATT];
> + u32 trig_patt[TPDM_CMB_MAX_PATT];
> + u32 trig_patt_mask[TPDM_CMB_MAX_PATT];
> };
>
> /**
> @@ -225,6 +260,10 @@ enum dataset_mem {
> DSB_PATT,
> DSB_PATT_MASK,
> DSB_MSR,
> + CMB_TRIG_PATT,
> + CMB_TRIG_PATT_MASK,
> + CMB_PATT,
> + CMB_PATT_MASK
> };
>
> /**

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Previous message: Juntong Deng: "Re: [RFC] mm/kasan: Add Allocation, Free, Error timestamps to KASAN report"
In reply to: Tao Zhang: "[PATCH v2 5/8] coresight-tpdm: Add pattern registers support for CMB"
Next in thread: Tao Zhang: "[PATCH v2 3/8] coresight-tpdm: Add CMB dataset support"
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