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Message-ID: <69ff07d9-85e2-4cef-8db5-612287ee1638@arm.com>
Date: Tue, 30 Jan 2024 12:40:12 +0000
From: Suzuki K Poulose <suzuki.poulose@....com>
To: Tao Zhang <quic_taozha@...cinc.com>,
Mathieu Poirier <mathieu.poirier@...aro.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Konrad Dybcio <konradybcio@...il.com>, Mike Leach <mike.leach@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc: Jinlong Mao <quic_jinlmao@...cinc.com>, Leo Yan <leo.yan@...aro.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>, coresight@...ts.linaro.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, Tingwei Zhang <quic_tingweiz@...cinc.com>,
Yuanfang Zhang <quic_yuanfang@...cinc.com>,
Trilok Soni <quic_tsoni@...cinc.com>, Song Chai <quic_songchai@...cinc.com>,
linux-arm-msm@...r.kernel.org, andersson@...nel.org
Subject: Re: [PATCH v5 07/10] coresight-tpdm: Add pattern registers support
for CMB
On 30/01/2024 09:02, 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.
>
> Reviewed-by: James Clark <james.clark@....com>
> Signed-off-by: Tao Zhang <quic_taozha@...cinc.com>
> Signed-off-by: Jinlong Mao <quic_jinlmao@...cinc.com>
> ---
> .../testing/sysfs-bus-coresight-devices-tpdm | 30 ++++++
> drivers/hwtracing/coresight/coresight-tpdm.c | 96 ++++++++++++++++++-
> drivers/hwtracing/coresight/coresight-tpdm.h | 39 ++++++++
> 3 files changed, 164 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> index 6dfb18d6d64a..b6cf050861ed 100644
> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> @@ -184,3 +184,33 @@ Description: (Write) Set the data collection mode of CMB tpdm. Continuous
> 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: January 2024
> +KernelVersion 6.9
> +Contact: Jinlong Mao (QUIC) <quic_jinlmao@...cinc.com>, Tao Zhang (QUIC) <quic_taozha@...cinc.com>
> +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: January 2024
> +KernelVersion 6.9
> +Contact: Jinlong Mao (QUIC) <quic_jinlmao@...cinc.com>, Tao Zhang (QUIC) <quic_taozha@...cinc.com>
> +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: January 2024
> +KernelVersion 6.9
> +Contact: Jinlong Mao (QUIC) <quic_jinlmao@...cinc.com>, Tao Zhang (QUIC) <quic_taozha@...cinc.com>
> +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: January 2024
> +KernelVersion 6.9
> +Contact: Jinlong Mao (QUIC) <quic_jinlmao@...cinc.com>, Tao Zhang (QUIC) <quic_taozha@...cinc.com>
> +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 b20071460375..07587287d9fa 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,
> ret = size;
> }
> break;
> + case CMB_TRIG_PATT:
> + if (tpdm_attr->idx < TPDM_CMB_MAX_PATT) {
> + drvdata->cmb->trig_patt[tpdm_attr->idx] = val;
> + ret = size;
> + }
> + break;
> + case CMB_TRIG_PATT_MASK:
> + if (tpdm_attr->idx < TPDM_CMB_MAX_PATT) {
> + drvdata->cmb->trig_patt_mask[tpdm_attr->idx] = val;
> + ret = size;
> + }
> + break;
> + case CMB_PATT:
> + if (tpdm_attr->idx < TPDM_CMB_MAX_PATT) {
> + drvdata->cmb->patt_val[tpdm_attr->idx] = val;
> + ret = size;
> + }
> + break;
> + case CMB_PATT_MASK:
> + if (tpdm_attr->idx < TPDM_CMB_MAX_PATT) {
> + drvdata->cmb->patt_mask[tpdm_attr->idx] = val;
> + ret = size;
> + }
> + break;
> default:
> break;
> }
> @@ -280,12 +324,32 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
>
> static void tpdm_enable_cmb(struct tpdm_drvdata *drvdata)
> {
> - u32 val;
> + u32 val, i;
>
> if (!tpdm_has_cmb_dataset(drvdata))
> return;
>
> + /* 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);
> + /*
> + * Set to 0 for continuous CMB collection mode,
> + * 1 for trace-on-change CMB collection mode.
> + */
> + if (drvdata->cmb->trace_mode)
> + val |= TPDM_CMB_CR_MODE;
> + else
> + val &= ~TPDM_CMB_CR_MODE;
> /* Set the enable bit of CMB control register to 1 */
> val |= TPDM_CMB_CR_ENA;
> writel_relaxed(val, drvdata->base + TPDM_CMB_CR);
> @@ -887,6 +951,22 @@ 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,
> @@ -933,6 +1013,18 @@ 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,
> @@ -941,6 +1033,8 @@ 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 2af92c270ed1..8cb8a9b35384 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*/
minor nit: Leave a space after/before '/*' & '*/'
Suzuki
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