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

[Alejandro Lucero Palau <alucerop@amd.com>]

On 2/11/26 22:10, Cheatham, Benjamin wrote:
> 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.


Right.


>
>> +		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?


Sure.

Thanks!


>
>> +		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");