Re: [PATCH v23 11/22] sfc: obtain decoder and region if committed by firmware

["Cheatham, Benjamin" <benjamin.cheatham@amd.com>]

On 2/1/2026 9:54 AM, alejandro.lucero-palau@amd.com wrote:
> From: Alejandro Lucero <alucerop@amd.com>
> 
> Check if device HDM is already committed during firmware/BIOS
> initialization.
> 
> A CXL region should exist if so after memdev allocation/initialization.
> Get HPA from region and map it.
> 
> Signed-off-by: Alejandro Lucero <alucerop@amd.com>
> ---
>  drivers/net/ethernet/sfc/efx_cxl.c | 28 +++++++++++++++++++++++++++-
>  1 file changed, 27 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/sfc/efx_cxl.c b/drivers/net/ethernet/sfc/efx_cxl.c
> index a77ef4783fcb..3536eccf1b2a 100644
> --- a/drivers/net/ethernet/sfc/efx_cxl.c
> +++ b/drivers/net/ethernet/sfc/efx_cxl.c
> @@ -19,6 +19,7 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
>  	struct efx_nic *efx = &probe_data->efx;
>  	struct pci_dev *pci_dev = efx->pci_dev;
>  	struct efx_cxl *cxl;
> +	struct range range;
>  	u16 dvsec;
>  	int rc;
>  
> @@ -90,13 +91,38 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
>  		return PTR_ERR(cxl->cxlmd);
>  	}
>  
> -	probe_data->cxl = cxl;
> +	cxl->cxled = cxl_get_committed_decoder(cxl->cxlmd, &cxl->efx_region);
> +	if (cxl->cxled) {
> +		if (!cxl->efx_region) {
> +			pci_err(pci_dev, "CXL found committed decoder without a region");
> +			return -ENODEV;
> +		}
> +		rc = cxl_get_region_range(cxl->efx_region, &range);

Missing an empty line above.

> +		if (rc) {
> +			pci_err(pci_dev,
> +				"CXL getting regions params from a committed decoder failed");
> +			return rc;
> +		}
> +
> +		cxl->ctpio_cxl = ioremap(range.start, range.end - range.start + 1);

Maybe use range_len() instead for the second parameter?

> +		if (!cxl->ctpio_cxl) {
> +			pci_err(pci_dev, "CXL ioremap region (%pra) failed", &range);
> +			return -ENOMEM;
> +		}
> +
> +		probe_data->cxl = cxl;
> +	}
>  
>  	return 0;
>  }
>  
>  void efx_cxl_exit(struct efx_probe_data *probe_data)
>  {
> +	if (!probe_data->cxl)
> +		return;
> +
> +	iounmap(probe_data->cxl->ctpio_cxl);
> +	cxl_unregister_region(probe_data->cxl->efx_region);
>  }
>  
>  MODULE_IMPORT_NS("CXL");