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

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Message-ID: <20251006100130.2623388-21-alejandro.lucero-palau@amd.com>
Date: Mon, 6 Oct 2025 11:01:28 +0100
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>
Subject: [PATCH v19 20/22] 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.

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@....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