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SubjectRe: [PATCH v7 07/10] Coresight: Add TPDA link driver
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On 09/05/2022 14:39, Mao Jinlong wrote:
> TPDA(Trace, Profiling and Diagnostics Aggregator) is
> to provide packetization, funneling and timestamping of
> TPDM data. Multiple monitors are connected to different
> input ports of TPDA.This change is to add tpda
> enable/disable/probe functions for coresight tpda driver.
>
> - - - - - - - - - - - -
> | TPDM 0| | TPDM 1 | | TPDM 2|
> - - - - - - - - - - - -
> | | |
> |_ _ _ _ _ _ | _ _ _ _ |
> | | |
> | | |
> ------------------
> | TPDA |
> ------------------
>
> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
> Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com>
> ---
> drivers/hwtracing/coresight/Kconfig | 11 +
> drivers/hwtracing/coresight/Makefile | 1 +
> drivers/hwtracing/coresight/coresight-tpda.c | 201 +++++++++++++++++++
> drivers/hwtracing/coresight/coresight-tpda.h | 33 +++
> 4 files changed, 246 insertions(+)
> create mode 100644 drivers/hwtracing/coresight/coresight-tpda.c
> create mode 100644 drivers/hwtracing/coresight/coresight-tpda.h
>
> diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig
> index 5c506a1cd08f..447919565326 100644
> --- a/drivers/hwtracing/coresight/Kconfig
> +++ b/drivers/hwtracing/coresight/Kconfig
> @@ -205,6 +205,7 @@ config CORESIGHT_TRBE
> config CORESIGHT_TPDM
> tristate "CoreSight Trace, Profiling & Diagnostics Monitor driver"
> select CORESIGHT_LINKS_AND_SINKS
> + select CORESIGHT_TPDA
> help
> This driver provides support for configuring monitor. Monitors are
> primarily responsible for data set collection and support the
> @@ -214,4 +215,14 @@ config CORESIGHT_TPDM
> To compile this driver as a module, choose M here: the module will be
> called coresight-tpdm.
>
> +config CORESIGHT_TPDA
> + tristate "CoreSight Trace, Profiling & Diagnostics Aggregator driver"
> + help
> + This driver provides support for configuring aggregator. This is
> + primarily useful for pulling the data sets from one or more
> + attached monitors and pushing the resultant data out. Multiple
> + monitors are connected on different input ports of TPDA.
> +
> + To compile this driver as a module, choose M here: the module will be
> + called coresight-tpda.
> endif
> diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile
> index 6bb9b1746bc7..1712d82e7260 100644
> --- a/drivers/hwtracing/coresight/Makefile
> +++ b/drivers/hwtracing/coresight/Makefile
> @@ -26,5 +26,6 @@ obj-$(CONFIG_CORESIGHT_CATU) += coresight-catu.o
> obj-$(CONFIG_CORESIGHT_CTI) += coresight-cti.o
> obj-$(CONFIG_CORESIGHT_TRBE) += coresight-trbe.o
> obj-$(CONFIG_CORESIGHT_TPDM) += coresight-tpdm.o
> +obj-$(CONFIG_CORESIGHT_TPDA) += coresight-tpda.o
> coresight-cti-y := coresight-cti-core.o coresight-cti-platform.o \
> coresight-cti-sysfs.o
> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c
> new file mode 100644
> index 000000000000..126286e89679
> --- /dev/null
> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
> @@ -0,0 +1,201 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#include <linux/amba/bus.h>
> +#include <linux/bitmap.h>
> +#include <linux/coresight.h>
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/fs.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +
> +#include "coresight-priv.h"
> +#include "coresight-tpda.h"
> +#include "coresight-trace-id.h"
> +
> +DEFINE_CORESIGHT_DEVLIST(tpda_devs, "tpda");
> +
> +/* Settings pre enabling port control register */
> +static void tpda_enable_pre_port(struct tpda_drvdata *drvdata)
> +{
> + u32 val;
> +
> + val = readl_relaxed(drvdata->base + TPDA_CR);
> + /* Bits 6 ~ 12 is for atid value */

minor nit, please could we use FIELD_PREP() and define the
ATID field in the TPDA_CR accordingly ?

> + val |= (drvdata->atid << 6)

then we could have :

val |= FIELD_PREP(TPDA_CR_ATID, drvdata->atid);

> + writel_relaxed(val, drvdata->base + TPDA_CR);
> +}
> +
> +static void tpda_enable_port(struct tpda_drvdata *drvdata, int port)
> +{
> + u32 val;
> +
> + val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
> + /* Enable the port */
> + val |= TPDA_Pn_CR_ENA;
> + writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
> +}
> +
> +static void _tpda_enable(struct tpda_drvdata *drvdata, int port)

minor nit: Similar to the tpdm, comment please use __tpda_{enable,disable}()

> +{
> + CS_UNLOCK(drvdata->base);
> +
> + if (!drvdata->enable)
> + tpda_enable_pre_port(drvdata);
> +
> + tpda_enable_port(drvdata, port);
> +
> + CS_LOCK(drvdata->base);
> +}
> +
> +static int tpda_enable(struct coresight_device *csdev, int inport, int outport)
> +{
> + struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
> +
> + mutex_lock(&drvdata->lock);
> + _tpda_enable(drvdata, inport);
> + drvdata->enable = true;

I am wondering if this is good enough ? Do we need a refcount ?
e.g, multiple TPDMs could be enabled independently and disabled
indpendently. And the tpda must stay alive until the last "source"
is gone away ?

> + mutex_unlock(&drvdata->lock);
> +
> + dev_info(drvdata->dev, "TPDA inport %d enabled\n", inport);
> + return 0;
> +}
> +
> +static void _tpda_disable(struct tpda_drvdata *drvdata, int port)
> +{
> + u32 val;
> +
> + CS_UNLOCK(drvdata->base);
> +
> + val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
> + val &= ~TPDA_Pn_CR_ENA;
> + writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
> +
> + CS_LOCK(drvdata->base);
> +}
> +
> +static void tpda_disable(struct coresight_device *csdev, int inport,
> + int outport)
> +{
> + struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
> +
> + mutex_lock(&drvdata->lock);
> + _tpda_disable(drvdata, inport);
> + drvdata->enable = false;

This is not sufficient. We need to make sure the TPDA has a refcount of
the enabled ports.

> + mutex_unlock(&drvdata->lock);
> +
> + dev_info(drvdata->dev, "TPDA inport %d disabled\n", inport);
> +}
> +
> +static const struct coresight_ops_link tpda_link_ops = {
> + .enable = tpda_enable,
> + .disable = tpda_disable,
> +};
> +
> +static const struct coresight_ops tpda_cs_ops = {
> + .link_ops = &tpda_link_ops,
> +};
> +
> +static int tpda_init_default_data(struct tpda_drvdata *drvdata)
> +{
> + int atid;
> + /*
> + * TPDA must has a unique atid. This atid can uniquely
> + * identify the TPDM trace source connect to the TPDA.

nit: s/connect/connected/

Also how do we identify the different TPDM sources
connected using a single atid ? Looking at the patch description
it is possible to have multiple TPDMs connected to a single TPDA.

> + */
> + atid = coresight_trace_id_get_system_id(coresight_get_trace_id_map());
> + if (atid < 0)
> + return atid;
> +
> + drvdata->atid = atid;
> + return 0;
> +}
> +
> +static int tpda_probe(struct amba_device *adev, const struct amba_id *id)
> +{
> + int ret;
> + struct device *dev = &adev->dev;
> + struct coresight_platform_data *pdata;
> + struct tpda_drvdata *drvdata;
> + struct coresight_desc desc = { 0 };
> +
> + pdata = coresight_get_platform_data(dev);
> + if (IS_ERR(pdata))
> + return PTR_ERR(pdata);
> + adev->dev.platform_data = pdata;
> +
> + drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
> + if (!drvdata)
> + return -ENOMEM;
> +
> + drvdata->dev = &adev->dev;
> + dev_set_drvdata(dev, drvdata);
> +
> + drvdata->base = devm_ioremap_resource(dev, &adev->res);
> + if (!drvdata->base)
> + return -ENOMEM;
> +
> + mutex_init(&drvdata->lock);
> +
> + ret = tpda_init_default_data(drvdata);
> + if (ret)
> + return ret;
> +
> + desc.name = coresight_alloc_device_name(&tpda_devs, dev);
> + if (!desc.name)
> + return -ENOMEM;
> + desc.type = CORESIGHT_DEV_TYPE_LINK;
> + desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
> + desc.ops = &tpda_cs_ops;
> + desc.pdata = adev->dev.platform_data;
> + desc.dev = &adev->dev;

desc.access must be initialised.

> + drvdata->csdev = coresight_register(&desc);
> + if (IS_ERR(drvdata->csdev))
> + return PTR_ERR(drvdata->csdev);
> +
> + pm_runtime_put(&adev->dev);
> +
> + dev_dbg(drvdata->dev, "TPDA initialized\n");
> + return 0;
> +}
> +
> +static void __exit tpda_remove(struct amba_device *adev)
> +{
> + struct tpda_drvdata *drvdata = dev_get_drvdata(&adev->dev);
> +
> + coresight_unregister(drvdata->csdev);
> +}
> +
> +/*
> + * Different TPDA has different periph id.
> + * The difference is 0-7 bits' value. So ignore 0-7 bits.
> + */
> +static struct amba_id tpda_ids[] = {
> + {
> + .id = 0x000f0f00,
> + .mask = 0x000fff00,
> + },
> + { 0, 0},
> +};
> +
> +static struct amba_driver tpda_driver = {
> + .drv = {
> + .name = "coresight-tpda",
> + .owner = THIS_MODULE,
> + .suppress_bind_attrs = true,
> + },
> + .probe = tpda_probe,
> + .remove = tpda_remove,
> + .id_table = tpda_ids,
> +};
> +
> +module_amba_driver(tpda_driver);
> +
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("Trace, Profiling & Diagnostic Aggregator driver");
> diff --git a/drivers/hwtracing/coresight/coresight-tpda.h b/drivers/hwtracing/coresight/coresight-tpda.h
> new file mode 100644
> index 000000000000..6df1b72b3b76
> --- /dev/null
> +++ b/drivers/hwtracing/coresight/coresight-tpda.h
> @@ -0,0 +1,33 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#ifndef _CORESIGHT_CORESIGHT_TPDA_H
> +#define _CORESIGHT_CORESIGHT_TPDA_H
> +
> +#define TPDA_CR (0x000)
> +#define TPDA_Pn_CR(n) (0x004 + (n * 4))
> +/* Aggregator port enable bit */
> +#define TPDA_Pn_CR_ENA BIT(0)
> +
> +#define TPDA_MAX_INPORTS 32
Please add the bit fields for TPDA_CR_ATID here and use
the FIELD_PREP()

#define TPDA_CR_ATID GENMASK(12, 6)

> +
> +/**
> + * struct tpda_drvdata - specifics associated to an TPDA component
> + * @base: memory mapped base address for this component.
> + * @dev: The device entity associated to this component.
> + * @csdev: component vitals needed by the framework.
> + * @lock: lock for the enable value.
> + * @enable: enable status of the component.
> + */
> +struct tpda_drvdata {
> + void __iomem *base;
> + struct device *dev;
> + struct coresight_device *csdev;
> + struct mutex lock;

Why mutex and not spinlock ?

> + bool enable;
> + u32 atid;

u8 atid ?


Suzuki

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