linux-kernel - Re: [PATCH 04/11] cxl/mem: Clear events on driver load

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Message-ID: <bb0a274c-ef6a-fea2-3f3c-344898e6cc24@intel.com>
Date:   Tue, 15 Nov 2022 15:10:42 -0700
From:   Dave Jiang <dave.jiang@...el.com>
To:     ira.weiny@...el.com, Dan Williams <dan.j.williams@...el.com>
Cc:     Jonathan Cameron <Jonathan.Cameron@...wei.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>,
        linux-kernel@...r.kernel.org, linux-cxl@...r.kernel.org
Subject: Re: [PATCH 04/11] cxl/mem: Clear events on driver load



On 11/10/2022 10:57 AM, ira.weiny@...el.com wrote:
> From: Ira Weiny <ira.weiny@...el.com>
> 
> The information contained in the events prior to the driver loading can
> be queried at any time through other mailbox commands.
> 
> Ensure a clean slate of events by reading and clearing the events.  The
> events are sent to the trace buffer but it is not anticipated to have
> anyone listening to it at driver load time.
> 
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>

Reviewed-by: Dave Jiang <dave.jiang@...el.com>

> ---
>   drivers/cxl/pci.c            | 2 ++
>   tools/testing/cxl/test/mem.c | 2 ++
>   2 files changed, 4 insertions(+)
> 
> diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
> index 62e560063e50..e0d511575b45 100644
> --- a/drivers/cxl/pci.c
> +++ b/drivers/cxl/pci.c
> @@ -530,6 +530,8 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>   	if (IS_ERR(cxlmd))
>   		return PTR_ERR(cxlmd);
>   
> +	cxl_mem_get_event_records(cxlds);
> +
>   	if (resource_size(&cxlds->pmem_res) && IS_ENABLED(CONFIG_CXL_PMEM))
>   		rc = devm_cxl_add_nvdimm(&pdev->dev, cxlmd);
>   
> diff --git a/tools/testing/cxl/test/mem.c b/tools/testing/cxl/test/mem.c
> index aa2df3a15051..e2f5445d24ff 100644
> --- a/tools/testing/cxl/test/mem.c
> +++ b/tools/testing/cxl/test/mem.c
> @@ -285,6 +285,8 @@ static int cxl_mock_mem_probe(struct platform_device *pdev)
>   	if (IS_ERR(cxlmd))
>   		return PTR_ERR(cxlmd);
>   
> +	cxl_mem_get_event_records(cxlds);
> +
>   	if (resource_size(&cxlds->pmem_res) && IS_ENABLED(CONFIG_CXL_PMEM))
>   		rc = devm_cxl_add_nvdimm(dev, cxlmd);
>