[PATCH v19 20/22] sfc: create cxl region

alejandro.lucero-palau
2025-10-06T10:04:36Z

From: Alejandro Lucero <alucerop@amd.com>

Use cxl api for creating a region using the endpoint decoder related to
a DPA range.

Add a callback for unwinding sfc cxl initialization when the endpoint port
is destroyed by potential cxl_acpi or cxl_mem modules removal.

Signed-off-by: Alejandro Lucero <alucerop@amd.com>
---
drivers/net/ethernet/sfc/efx_cxl.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/drivers/net/ethernet/sfc/efx_cxl.c b/drivers/net/ethernet/sfc/efx_cxl.c
index 1a50bb2c0913..79fe99d83f9f 100644
--- a/drivers/net/ethernet/sfc/efx_cxl.c
+++ b/drivers/net/ethernet/sfc/efx_cxl.c
@@ -116,6 +116,14 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
return PTR_ERR(cxl->cxled);
}

+ cxl->efx_region = cxl_create_region(cxl->cxlrd, &cxl->cxled, 1);
+ if (IS_ERR(cxl->efx_region)) {
+ pci_err(pci_dev, "CXL accel create region failed");
+ cxl_put_root_decoder(cxl->cxlrd);
+ cxl_dpa_free(cxl->cxled);
+ return PTR_ERR(cxl->efx_region);
+ }
+
probe_data->cxl = cxl;

return 0;
@@ -124,6 +132,8 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
void efx_cxl_exit(struct efx_probe_data *probe_data)
{
if (probe_data->cxl) {
+ cxl_decoder_detach(NULL, probe_data->cxl->cxled, 0,
+ DETACH_INVALIDATE);
cxl_dpa_free(probe_data->cxl->cxled);
cxl_put_root_decoder(probe_data->cxl->cxlrd);
}
--
2.34.1