netdev - [PATCH v14 14/22] sfc: get endpoint decoder

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Message-ID: <20250417212926.1343268-15-alejandro.lucero-palau@amd.com>
Date: Thu, 17 Apr 2025 22:29:17 +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>, Martin Habets
	<habetsm.xilinx@...il.com>, Edward Cree <ecree.xilinx@...il.com>, "Jonathan
 Cameron" <Jonathan.Cameron@...wei.com>
Subject: [PATCH v14 14/22] sfc: get endpoint decoder

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

Use cxl api for getting DPA (Device Physical Address) to use through an
endpoint decoder.

Signed-off-by: Alejandro Lucero <alucerop@....com>
Reviewed-by: Martin Habets <habetsm.xilinx@...il.com>
Acked-by: Edward Cree <ecree.xilinx@...il.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---
 drivers/net/ethernet/sfc/efx_cxl.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/sfc/efx_cxl.c b/drivers/net/ethernet/sfc/efx_cxl.c
index f08a9f43bd38..21c94391f687 100644
--- a/drivers/net/ethernet/sfc/efx_cxl.c
+++ b/drivers/net/ethernet/sfc/efx_cxl.c
@@ -99,18 +99,33 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
 		pci_err(pci_dev, "%s: not enough free HPA space %pap < %u\n",
 			__func__, &max_size, EFX_CTPIO_BUFFER_SIZE);
 		cxl_put_root_decoder(cxl->cxlrd);
-		return -ENOSPC;
+		rc = -ENOSPC;
+		goto sfc_put_decoder;
+	}
+
+	cxl->cxled = cxl_request_dpa(cxl->cxlmd, CXL_PARTMODE_RAM,
+				     EFX_CTPIO_BUFFER_SIZE);
+	if (IS_ERR(cxl->cxled)) {
+		pci_err(pci_dev, "CXL accel request DPA failed");
+		rc = PTR_ERR(cxl->cxled);
+		goto sfc_put_decoder;
 	}
 
 	probe_data->cxl = cxl;
 
 	return 0;
+
+sfc_put_decoder:
+	cxl_put_root_decoder(cxl->cxlrd);
+	return rc;
 }
 
 void efx_cxl_exit(struct efx_probe_data *probe_data)
 {
-	if (probe_data->cxl)
+	if (probe_data->cxl) {
+		cxl_dpa_free(probe_data->cxl->cxled);
 		cxl_put_root_decoder(probe_data->cxl->cxlrd);
+	}
 }
 
 MODULE_IMPORT_NS("CXL");
-- 
2.34.1