Re: [PATCH v10 11/17] cxl/pci: Log message if RAS registers are unmapped

[Dave Jiang <dave.jiang@intel.com>]

On 6/26/25 3:42 PM, Terry Bowman wrote:
> The CXL RAS handlers do not currently log if the RAS registers are
> unmapped. This is needed in order to help debug CXL error handling. Update
> the CXL driver to log a warning message if the RAS register block is
> unmapped during RAS error handling.
> 
> Signed-off-by: Terry Bowman <terry.bowman@amd.com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>

Reviewed-by: Dave Jiang <dave.jiang@intel.com>
> ---
>  drivers/cxl/core/pci.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
> index 9b464f9c55c1..c9a4b528e0b8 100644
> --- a/drivers/cxl/core/pci.c
> +++ b/drivers/cxl/core/pci.c
> @@ -670,8 +670,10 @@ static void cxl_handle_cor_ras(struct device *dev,
>  	void __iomem *addr;
>  	u32 status;
>  
> -	if (!ras_base)
> +	if (!ras_base) {
> +		dev_warn_once(dev, "CXL RAS register block is not mapped");
>  		return;
> +	}
>  
>  	addr = ras_base + CXL_RAS_CORRECTABLE_STATUS_OFFSET;
>  	status = readl(addr);
> @@ -709,8 +711,10 @@ static bool cxl_handle_ras(struct device *dev, void __iomem *ras_base)
>  	u32 status;
>  	u32 fe;
>  
> -	if (!ras_base)
> +	if (!ras_base) {
> +		dev_warn_once(dev, "CXL RAS register block is not mapped");
>  		return false;
> +	}
>  
>  	addr = ras_base + CXL_RAS_UNCORRECTABLE_STATUS_OFFSET;
>  	status = readl(addr);