Re: [RFC PATCH 3/9] cxl/mem: Clear events on driver load

[Jonathan Cameron]

On Fri, 12 Aug 2022 22:32:37 -0700
ira.weiny@xxxxxxxxx wrote:

> From: Ira Weiny <ira.weiny@xxxxxxxxx>
> 
> 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.

I'm not totally sold on it being a good idea to drop records on binding
the device.  Let's see what others think...

> 
> Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>
> ---
>  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 faeb5d9d7a7a..5f1b492bd388 100644
> --- a/drivers/cxl/pci.c
> +++ b/drivers/cxl/pci.c
> @@ -498,6 +498,8 @@ 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);
>