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Message-ID: <ea720e1a-c0d2-84b0-8dbc-bb5031d32208@quicinc.com>
Date: Tue, 24 May 2022 15:00:05 +0800
From: Jinlong Mao <quic_jinlmao@...cinc.com>
To: Suzuki K Poulose <suzuki.poulose@....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>
CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
<coresight@...ts.linaro.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>,
Tingwei Zhang <quic_tingweiz@...cinc.com>,
Yuanfang Zhang <quic_yuanfang@...cinc.com>,
Tao Zhang <quic_taozha@...cinc.com>,
Trilok Soni <quic_tsoni@...cinc.com>,
Hao Zhang <quic_hazha@...cinc.com>,
<linux-arm-msm@...r.kernel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [PATCH v7 02/10] Coresight: Add coresight TPDM source driver
Hi Suzuki,
Thank you for the review.
On 5/23/2022 4:57 PM, Suzuki K Poulose wrote:
> Hi
>
> On 09/05/2022 14:39, Mao Jinlong wrote:
>> Add driver to support Coresight device TPDM (Trace, Profiling and
>> Diagnostics Monitor). TPDM is a monitor to collect data from
>> different datasets. This change is to add probe/enable/disable
>> functions for tpdm source.
>>
>> Signed-off-by: Tao Zhang <quic_taozha@...cinc.com>
>> Signed-off-by: Mao Jinlong <quic_jinlmao@...cinc.com>
>> ---
>> drivers/hwtracing/coresight/Kconfig | 13 ++
>> drivers/hwtracing/coresight/Makefile | 1 +
>> drivers/hwtracing/coresight/coresight-core.c | 5 +-
>> drivers/hwtracing/coresight/coresight-tpdm.c | 146 +++++++++++++++++++
>> drivers/hwtracing/coresight/coresight-tpdm.h | 26 ++++
>> include/linux/coresight.h | 1 +
>> 6 files changed, 191 insertions(+), 1 deletion(-)
>> create mode 100644 drivers/hwtracing/coresight/coresight-tpdm.c
>> create mode 100644 drivers/hwtracing/coresight/coresight-tpdm.h
>>
>> diff --git a/drivers/hwtracing/coresight/Kconfig
>> b/drivers/hwtracing/coresight/Kconfig
>> index 514a9b8086e3..5c506a1cd08f 100644
>> --- a/drivers/hwtracing/coresight/Kconfig
>> +++ b/drivers/hwtracing/coresight/Kconfig
>> @@ -201,4 +201,17 @@ config CORESIGHT_TRBE
>> To compile this driver as a module, choose M here: the
>> module will be
>> called coresight-trbe.
>> +
>> +config CORESIGHT_TPDM
>> + tristate "CoreSight Trace, Profiling & Diagnostics Monitor driver"
>> + select CORESIGHT_LINKS_AND_SINKS
>> + help
>> + This driver provides support for configuring monitor. Monitors
>> are
>> + primarily responsible for data set collection and support the
>> + ability to collect any permutation of data set types. Monitors
>> are
>> + also responsible for interaction with system cross triggering.
>
> I find the last statement a bit confusing. Could this be :
>
> "Monitors are also connected to the cross triggers."
Some tpdm events can be triggered by CTI trigger out.
>
>> +
>> + To compile this driver as a module, choose M here: the module
>> will be
>> + called coresight-tpdm.
>> +
>> endif
>> diff --git a/drivers/hwtracing/coresight/Makefile
>> b/drivers/hwtracing/coresight/Makefile
>> index 329a0c704b87..6bb9b1746bc7 100644
>> --- a/drivers/hwtracing/coresight/Makefile
>> +++ b/drivers/hwtracing/coresight/Makefile
>> @@ -25,5 +25,6 @@ obj-$(CONFIG_CORESIGHT_CPU_DEBUG) +=
>> coresight-cpu-debug.o
>> obj-$(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
>> coresight-cti-y := coresight-cti-core.o coresight-cti-platform.o \
>> coresight-cti-sysfs.o
>> diff --git a/drivers/hwtracing/coresight/coresight-core.c
>> b/drivers/hwtracing/coresight/coresight-core.c
>> index 23ab16dd9b5d..75fe1781df20 100644
>> --- a/drivers/hwtracing/coresight/coresight-core.c
>> +++ b/drivers/hwtracing/coresight/coresight-core.c
>> @@ -1047,7 +1047,8 @@ 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_SOFTWARE &&
>> + subtype != CORESIGHT_DEV_SUBTYPE_SOURCE_DATA_ONLY) {
>> dev_err(&csdev->dev, "wrong device subtype in %s\n",
>> function);
>> return -EINVAL;
>> }
>> @@ -1116,6 +1117,7 @@ int coresight_enable(struct coresight_device
>> *csdev)
>> per_cpu(tracer_path, cpu) = path;
>> break;
>> case CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE:
>> + case CORESIGHT_DEV_SUBTYPE_SOURCE_DATA_ONLY:
>> /*
>> * Use the hash of source's device name as ID
>> * and map the ID to the pointer of the path.
>> @@ -1165,6 +1167,7 @@ void coresight_disable(struct coresight_device
>> *csdev)
>> per_cpu(tracer_path, cpu) = NULL;
>> break;
>> case CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE:
>> + case CORESIGHT_DEV_SUBTYPE_SOURCE_DATA_ONLY:
>> hash = hashlen_hash(hashlen_string(NULL,
>> dev_name(&csdev->dev)));
>> /* Find the path by the hash. */
>> path = idr_find(&path_idr, hash);
>> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c
>> b/drivers/hwtracing/coresight/coresight-tpdm.c
>> new file mode 100644
>> index 000000000000..6a4e2a35053d
>> --- /dev/null
>> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
>> @@ -0,0 +1,146 @@
>> +// 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/coresight-pmu.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 "coresight-priv.h"
>> +#include "coresight-tpdm.h"
>> +
>> +DEFINE_CORESIGHT_DEVLIST(tpdm_devs, "tpdm");
>> +
>> +/* TPDM enable operations */
>> +static int tpdm_enable(struct coresight_device *csdev,
>> + struct perf_event *event, u32 mode)
>> +{
>> + struct tpdm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
>> +
>> + mutex_lock(&drvdata->lock);
>> + if (drvdata->enable) {
>> + mutex_unlock(&drvdata->lock);
>> + return -EBUSY;
>> + }
>> +
>> + drvdata->enable = true;
>> + mutex_unlock(&drvdata->lock);
>> +
>> + dev_info(drvdata->dev, "TPDM tracing enabled\n");
>> + return 0;
>> +}
>> +
>> +/* TPDM disable operations */
>> +static void tpdm_disable(struct coresight_device *csdev,
>> + struct perf_event *event)
>> +{
>> + struct tpdm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
>> +
>> + mutex_lock(&drvdata->lock);
>> + if (!drvdata->enable) {
>> + mutex_unlock(&drvdata->lock);
>> + return;
>> + }
>> +
>> + drvdata->enable = false;
>> + mutex_unlock(&drvdata->lock);
>> +
>> + dev_info(drvdata->dev, "TPDM tracing disabled\n");
>> +}
>> +
>> +static const struct coresight_ops_source tpdm_source_ops = {
>> + .enable = tpdm_enable,
>> + .disable = tpdm_disable,
>> +};
>> +
>> +static const struct coresight_ops tpdm_cs_ops = {
>> + .source_ops = &tpdm_source_ops,
>> +};
>> +
>> +static int tpdm_probe(struct amba_device *adev, const struct amba_id
>> *id)
>> +{
>> + struct device *dev = &adev->dev;
>> + struct coresight_platform_data *pdata;
>> + struct tpdm_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;
>> +
>> + /* driver data*/
>> + 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);
>> +
>> + /* Set up coresight component description */
>> + desc.name = coresight_alloc_device_name(&tpdm_devs, dev);
>> + if (!desc.name)
>> + return -ENOMEM;
>> + desc.type = CORESIGHT_DEV_TYPE_SOURCE;
>> + desc.subtype.source_subtype =
>> CORESIGHT_DEV_SUBTYPE_SOURCE_DATA_ONLY;
>> + desc.ops = &tpdm_cs_ops;
>> + desc.pdata = adev->dev.platform_data;
>> + desc.dev = &adev->dev;
>
> desc.access must be initialised here.
>
> desc.access = CSDEV_ACCESS_IOMEM(drvdata->base);
>
>> + drvdata->csdev = coresight_register(&desc);
>> + if (IS_ERR(drvdata->csdev))
>> + return PTR_ERR(drvdata->csdev);
>> +
>> + /* Decrease pm refcount when probe is done.*/
>> + pm_runtime_put(&adev->dev);
>> +
>> + return 0;
>> +}
>> +
>> +static void __exit tpdm_remove(struct amba_device *adev)
>> +{
>> + struct tpdm_drvdata *drvdata = dev_get_drvdata(&adev->dev);
>> +
>> + coresight_unregister(drvdata->csdev);
>> +}
>> +
>> +/*
>> + * Different TPDM has different periph id.
>> + * The difference is 0-7 bits' value. So ignore 0-7 bits.
>> + */
>> +static struct amba_id tpdm_ids[] = {
>> + {
>> + .id = 0x000f0e00,
>> + .mask = 0x000fff00,
>> + },
>> + { 0, 0},
>> +};
>> +
>> +static struct amba_driver tpdm_driver = {
>> + .drv = {
>> + .name = "coresight-tpdm",
>> + .owner = THIS_MODULE,
>> + .suppress_bind_attrs = true,
>> + },
>> + .probe = tpdm_probe,
>> + .id_table = tpdm_ids,
>> + .remove = tpdm_remove,
>> +};
>> +
>> +module_amba_driver(tpdm_driver);
>> +
>> +MODULE_LICENSE("GPL v2");
>> +MODULE_DESCRIPTION("Trace, Profiling & Diagnostic Monitor driver");
>> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h
>> b/drivers/hwtracing/coresight/coresight-tpdm.h
>> new file mode 100644
>> index 000000000000..94a7748a5426
>> --- /dev/null
>> +++ b/drivers/hwtracing/coresight/coresight-tpdm.h
>> @@ -0,0 +1,26 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/*
>> + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights
>> reserved.
>> + */
>> +
>> +#ifndef _CORESIGHT_CORESIGHT_TPDM_H
>> +#define _CORESIGHT_CORESIGHT_TPDM_H
>> +
>> +/**
>> + * struct tpdm_drvdata - specifics associated to an TPDM 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 tpdm_drvdata {
>> + void __iomem *base;
>> + struct device *dev;
>> + struct coresight_device *csdev;
>> + struct mutex lock;
>
> Why mutex lock ? Couldn't this be a spinlock ?
1. There is no irq for TPDM
2. As there are 7 dataset types, there will be some FOR loop to configure
tpdm registers which may cause some time.
>
>> + bool enable;
>> +};
>> +
>> +#endif /* _CORESIGHT_CORESIGHT_TPDM_H */
>> diff --git a/include/linux/coresight.h b/include/linux/coresight.h
>> index 247147c11231..a9efac55029d 100644
>> --- a/include/linux/coresight.h
>> +++ b/include/linux/coresight.h
>> @@ -61,6 +61,7 @@ enum coresight_dev_subtype_source {
>> CORESIGHT_DEV_SUBTYPE_SOURCE_PROC,
>> CORESIGHT_DEV_SUBTYPE_SOURCE_BUS,
>> CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE,
>> + CORESIGHT_DEV_SUBTYPE_SOURCE_DATA_ONLY,
>
> super minor nit: I find the choice of name a bit odd.
> We could simply make it something like :
>
> CORESIGHT_DEV_SUBTYPE_SOURCE_OTHERS:
>
> Suzuki
I will check and update.
>
>> };
>> enum coresight_dev_subtype_helper {
>
> _______________________________________________
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