linux-kernel - Re: [PATCH V2 09/11] cxl/test: Add generic mock events

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Message-ID: <20221201143727.0000255c@Huawei.com>
Date:   Thu, 1 Dec 2022 14:37:27 +0000
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     <ira.weiny@...el.com>
CC:     Dan Williams <dan.j.williams@...el.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        "Ben Widawsky" <bwidawsk@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        Dave Jiang <dave.jiang@...el.com>,
        <linux-kernel@...r.kernel.org>, <linux-cxl@...r.kernel.org>
Subject: Re: [PATCH V2 09/11] cxl/test: Add generic mock events

On Wed, 30 Nov 2022 16:27:17 -0800
ira.weiny@...el.com wrote:

> From: Ira Weiny <ira.weiny@...el.com>
> 
> Facilitate testing basic Get/Clear Event functionality by creating
> multiple logs and generic events with made up UUID's.
> 
> Data is completely made up with data patterns which should be easy to
> spot in trace output.
> 
> A single sysfs entry resets the event data and triggers collecting the
> events for testing.
> 
> Events are returned one at a time which is within the specification even
> though it does not exercise the full capabilities of what a device may
> do.
> 
> Test traces are easy to obtain with a small script such as this:
> 
> 	#!/bin/bash -x
> 
> 	devices=`find /sys/devices/platform -name cxl_mem*`
> 
> 	# Turn on tracing
> 	echo "" > /sys/kernel/tracing/trace
> 	echo 1 > /sys/kernel/tracing/events/cxl/enable
> 	echo 1 > /sys/kernel/tracing/tracing_on
> 
> 	# Generate fake interrupt
> 	for device in $devices; do
> 	        echo 1 > $device/event_trigger
> 	done
> 
> 	# Turn off tracing and report events
> 	echo 0 > /sys/kernel/tracing/tracing_on
> 	cat /sys/kernel/tracing/trace
> 
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> 

A minor comment on xarray cleanup inline

Jonathan


> +void cxl_mock_remove_event_logs(struct device *dev)
> +{
> +	struct mock_event_store *mes;
> +
> +	mes = xa_erase(&mock_dev_event_store, (unsigned long)dev);

As below, I'd move this into a devm_add_action_or_reset() so
that we don't need to deal with doing it manually.

> +}
> +EXPORT_SYMBOL_GPL(cxl_mock_remove_event_logs);

...

>  static int cxl_mock_mem_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
>  	struct cxl_memdev *cxlmd;
>  	struct cxl_dev_state *cxlds;
> +	u32 ev_status;
>  	void *lsa;
>  	int rc;
>  
> @@ -281,11 +304,13 @@ static int cxl_mock_mem_probe(struct platform_device *pdev)
>  	if (rc)
>  		return rc;
>  
> +	ev_status = cxl_mock_add_event_logs(cxlds);

On error later in this function these leak.  Just use devm_add_action_or_reset()
inside cxl_mock_add_event_logs() so we don't have to care about that.

> +
>  	cxlmd = devm_cxl_add_memdev(cxlds);
>  	if (IS_ERR(cxlmd))
>  		return PTR_ERR(cxlmd);
>  
> -	cxl_mem_get_event_records(cxlds);
> +	__cxl_mem_get_event_records(cxlds, ev_status);
>  
>  	if (resource_size(&cxlds->pmem_res) && IS_ENABLED(CONFIG_CXL_PMEM))
>  		rc = devm_cxl_add_nvdimm(dev, cxlmd);
> @@ -293,6 +318,12 @@ static int cxl_mock_mem_probe(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +static int cxl_mock_mem_remove(struct platform_device *pdev)
> +{
> +	cxl_mock_remove_event_logs(&pdev->dev);
Why not use devm_add_action_or_reset()?

> +	return 0;
> +}
> +

>