[PATCH v24 09/11] sfc: obtain decoder and region if committed by firmware

alejandro.lucero-palau
2026-03-23T11:32:15Z

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>
Acked-by: Edward Cree <ecree.xilinx@gmail.com>
---
drivers/net/ethernet/sfc/efx_cxl.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)

diff --git a/drivers/net/ethernet/sfc/efx_cxl.c b/drivers/net/ethernet/sfc/efx_cxl.c
index 22a7d1d95425..78f926300943 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;

@@ -82,6 +83,24 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
return PTR_ERR(cxl->cxlmd);
}

+ cxl->cxled = cxl_get_committed_decoder(cxl->cxlmd, &cxl->efx_region);
+ if (!cxl->cxled || !cxl->efx_region)
+ return -ENODEV;
+
+ rc = cxl_get_region_range(cxl->efx_region, &range);
+ if (rc) {
+ pci_err(pci_dev,
+ "CXL getting regions params from a committed decoder failed");
+ return rc;
+ }
+
+ cxl->ctpio_cxl = ioremap(range.start, range_len(&range));
+ if (!cxl->ctpio_cxl) {
+ pci_err(pci_dev, "CXL ioremap region (%pra) failed", &range);
+ return -ENOMEM;
+ }
+
+
probe_data->cxl = cxl;

return 0;
@@ -89,6 +108,11 @@ int efx_cxl_init(struct efx_probe_data *probe_data)

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");
--
2.34.1