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Message-ID: <444bc278-a3e3-7d99-6020-7c3337371f66@arm.com>
Date: Tue, 23 May 2023 11:07:01 +0100
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>,
Hao Zhang <quic_hazha@...cinc.com>,
linux-arm-msm@...r.kernel.org, andersson@...nel.org
Subject: Re: [PATCH v4 02/11] coresight-tpda: Add DSB dataset support
On 27/04/2023 10:00, Tao Zhang wrote:
> Read the DSB element size from the device tree. Set the register
> bit that controls the DSB element size of the corresponding port.
>
> Signed-off-by: Tao Zhang <quic_taozha@...cinc.com>
> ---
> drivers/hwtracing/coresight/coresight-core.c | 1 +
> drivers/hwtracing/coresight/coresight-tpda.c | 92 +++++++++++++++++++++++++---
> drivers/hwtracing/coresight/coresight-tpda.h | 4 ++
> drivers/hwtracing/coresight/coresight-tpdm.c | 2 +-
> include/linux/coresight.h | 1 +
> 5 files changed, 90 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
> index 2af416b..f1eacbb 100644
> --- a/drivers/hwtracing/coresight/coresight-core.c
> +++ b/drivers/hwtracing/coresight/coresight-core.c
> @@ -1092,6 +1092,7 @@ static int coresight_validate_source(struct coresight_device *csdev,
>
> if (subtype != CORESIGHT_DEV_SUBTYPE_SOURCE_PROC &&
> subtype != CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE &&
> + subtype != CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM &&
> subtype != CORESIGHT_DEV_SUBTYPE_SOURCE_OTHERS) {
> dev_err(&csdev->dev, "wrong device subtype in %s\n", function);
> return -EINVAL;
Please see the comment at the bottom.
> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c
> index 8d2b9d2..af9c72f 100644
> --- a/drivers/hwtracing/coresight/coresight-tpda.c
> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
> @@ -21,6 +21,56 @@
>
> DEFINE_CORESIGHT_DEVLIST(tpda_devs, "tpda");
>
> +/* Search and read element data size from the TPDM node in
> + * the devicetree. Each input port of TPDA is connected to
> + * a TPDM. Different TPDM supports different types of dataset,
> + * and some may support more than one type of dataset.
> + * Parameter "inport" is used to pass in the input port number
> + * of TPDA, and it is set to 0 in the recursize call.
> + * Parameter "parent" is used to pass in the original call.
> + */
> +static int tpda_set_element_size(struct tpda_drvdata *drvdata,
> + struct coresight_device *csdev, int inport, bool parent)
> +{
> + static int nr_inport;
> + int i;
> + static bool tpdm_found;
> + struct coresight_device *in_csdev;
> +
> + if (inport > (TPDA_MAX_INPORTS - 1))
> + return -EINVAL;
> +
> + if (parent) {
> + nr_inport = inport;
> + tpdm_found = false;
> + }
> +
> + for (i = 0; i < csdev->pdata->nr_inconns; i++) {
> + in_csdev = csdev->pdata->in_conns[i]->src_dev;
> + if (!in_csdev)
> + break;
> +
> + if (parent)
> + if (csdev->pdata->in_conns[i]->dest_port != inport)
> + continue;
> +
> + if (in_csdev->subtype.source_subtype
We must match the in_csdev->type to be SOURCE && the subtype.
> + == CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM) {
> + of_property_read_u8(in_csdev->dev.parent->of_node,
> + "qcom,dsb-element-size", &drvdata->dsb_esize[nr_inport]);
> + if (!tpdm_found)
> + tpdm_found = true;
> + else
> + dev_warn(drvdata->dev,
> + "More than one TPDM is mapped to the TPDA input port %d.\n",
> + nr_inport);
When we know, we have found a source device, we don't need to recurse
down and could simply 'continue' to the next one in the list and skip
the call below.
> + }
> + tpda_set_element_size(drvdata, in_csdev, 0, false);
> + }
> +
> + return 0;
> +}
> +
> /* Settings pre enabling port control register */
> static void tpda_enable_pre_port(struct tpda_drvdata *drvdata)
> {
> @@ -32,26 +82,43 @@ static void tpda_enable_pre_port(struct tpda_drvdata *drvdata)
> writel_relaxed(val, drvdata->base + TPDA_CR);
> }
>
> -static void tpda_enable_port(struct tpda_drvdata *drvdata, int port)
> +static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
> {
> u32 val;
>
> val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
> + /*
> + * Configure aggregator port n DSB data set element size
> + * Set the bit to 0 if the size is 32
> + * Set the bit to 1 if the size is 64
> + */
> + if (drvdata->dsb_esize[port] == 32)
> + val &= ~TPDA_Pn_CR_DSBSIZE;
> + else if (drvdata->dsb_esize[port] == 64)
> + val |= TPDA_Pn_CR_DSBSIZE;
> + else
> + return -EINVAL;
> +
> /* Enable the port */
> val |= TPDA_Pn_CR_ENA;
> writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
> +
> + return 0;
> }
>
> -static void __tpda_enable(struct tpda_drvdata *drvdata, int port)
> +static int __tpda_enable(struct tpda_drvdata *drvdata, int port)
> {
> + int ret;
> +
> CS_UNLOCK(drvdata->base);
>
> if (!drvdata->csdev->enable)
> tpda_enable_pre_port(drvdata);
>
> - tpda_enable_port(drvdata, port);
> -
> + ret = tpda_enable_port(drvdata, port);
> CS_LOCK(drvdata->base);
> +
> + return ret;
> }
>
> static int tpda_enable(struct coresight_device *csdev,
> @@ -59,16 +126,23 @@ static int tpda_enable(struct coresight_device *csdev,
> struct coresight_connection *out)
> {
> struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
> + int ret;
> +
> + ret = tpda_set_element_size(drvdata, csdev, in->dest_port, true);
> + if (ret)
> + return ret;
>
> spin_lock(&drvdata->spinlock);
> - if (atomic_read(&in->dest_refcnt) == 0)
> + if (atomic_read(&in->dest_refcnt) == 0) {
> __tpda_enable(drvdata, in->dest_port);
ret = ... ?
> + if (!ret) {
> + atomic_inc(&in->dest_refcnt);
> + dev_dbg(drvdata->dev, "TPDA inport %d enabled.\n", in->dest_port);
> + }
> + }
>
> - atomic_inc(&in->dest_refcnt);
This seems wrong, as we may fail to hold additional refcounts for the
additional sessions ?
> spin_unlock(&drvdata->spinlock);
> -
> - dev_dbg(drvdata->dev, "TPDA inport %d enabled.\n", in->dest_port);
> - return 0;
> + return ret;
> }
>
> static void __tpda_disable(struct tpda_drvdata *drvdata, int port)
> diff --git a/drivers/hwtracing/coresight/coresight-tpda.h b/drivers/hwtracing/coresight/coresight-tpda.h
> index 0399678..7332e9c 100644
> --- a/drivers/hwtracing/coresight/coresight-tpda.h
> +++ b/drivers/hwtracing/coresight/coresight-tpda.h
> @@ -10,6 +10,8 @@
> #define TPDA_Pn_CR(n) (0x004 + (n * 4))
> /* Aggregator port enable bit */
> #define TPDA_Pn_CR_ENA BIT(0)
> +/* Aggregator port DSB data set element size bit */
> +#define TPDA_Pn_CR_DSBSIZE BIT(8)
>
> #define TPDA_MAX_INPORTS 32
>
> @@ -23,6 +25,7 @@
> * @csdev: component vitals needed by the framework.
> * @spinlock: lock for the drvdata value.
> * @enable: enable status of the component.
> + * @dsb_esize: DSB element size, it must be 32 or 64.
minor nit:
DSB element size for each inport, it must be 32 or 64
> */
> struct tpda_drvdata {
> void __iomem *base;
> @@ -30,6 +33,7 @@ struct tpda_drvdata {
> struct coresight_device *csdev;
> spinlock_t spinlock;
> u8 atid;
> + u8 dsb_esize[TPDA_MAX_INPORTS];
> };
>
> #endif /* _CORESIGHT_CORESIGHT_TPDA_H */
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
> index f4854af..ba1867f 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
> @@ -205,7 +205,7 @@ static int tpdm_probe(struct amba_device *adev, const struct amba_id *id)
> if (!desc.name)
> return -ENOMEM;
> desc.type = CORESIGHT_DEV_TYPE_SOURCE;
> - desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_OTHERS;
> + desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM;
> desc.ops = &tpdm_cs_ops;
> desc.pdata = adev->dev.platform_data;
> desc.dev = &adev->dev;
Please could you split this change, i.e., introduction of
SUBTYPE_SOURCE_TPDM and using this in TPDM driver,
in a separate patch before this change.
> diff --git a/include/linux/coresight.h b/include/linux/coresight.h
> index 225a5fa..6563896 100644
> --- a/include/linux/coresight.h
> +++ b/include/linux/coresight.h
> @@ -60,6 +60,7 @@ enum coresight_dev_subtype_source {
> CORESIGHT_DEV_SUBTYPE_SOURCE_PROC,
> CORESIGHT_DEV_SUBTYPE_SOURCE_BUS,
> CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE,
> + CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM,
> CORESIGHT_DEV_SUBTYPE_SOURCE_OTHERS,
> };
>
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