netdev - [PATCH v22 24/25] sfc: create cxl region

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Message-ID: <20251205115248.772945-25-alejandro.lucero-palau@amd.com>
Date: Fri, 5 Dec 2025 11:52:47 +0000
From: <alejandro.lucero-palau@....com>
To: <linux-cxl@...r.kernel.org>, <netdev@...r.kernel.org>,
	<dan.j.williams@...el.com>, <edward.cree@....com>, <davem@...emloft.net>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <edumazet@...gle.com>,
	<dave.jiang@...el.com>
CC: Alejandro Lucero <alucerop@....com>, Jonathan Cameron
	<Jonathan.Cameron@...wei.com>
Subject: [PATCH v22 24/25] sfc: create cxl region

From: Alejandro Lucero <alucerop@....com>

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

Signed-off-by: Alejandro Lucero <alucerop@....com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Reviewed-by: Dave Jiang <dave.jiang@...el.com>
---
 drivers/net/ethernet/sfc/efx_cxl.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/sfc/efx_cxl.c b/drivers/net/ethernet/sfc/efx_cxl.c
index 56e7104483a5..18b487d0cac3 100644
--- a/drivers/net/ethernet/sfc/efx_cxl.c
+++ b/drivers/net/ethernet/sfc/efx_cxl.c
@@ -136,6 +136,14 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
 			cxl_put_root_decoder(cxl->cxlrd);
 			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;
@@ -152,11 +160,14 @@ void efx_cxl_exit(struct efx_probe_data *probe_data)
 		iounmap(probe_data->cxl->ctpio_cxl);
 		cxl_decoder_detach(NULL, probe_data->cxl->cxled, 0,
 				   DETACH_INVALIDATE);
-		unregister_region(probe_data->cxl->efx_region);
 	} else {
+		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);
 	}
+
+	unregister_region(probe_data->cxl->efx_region);
 }
 
 MODULE_IMPORT_NS("CXL");
-- 
2.34.1