netdev - [PATCH v10 17/26] sfc: get endpoint decoder

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Message-ID: <20250205151950.25268-18-alucerop@amd.com>
Date: Wed, 5 Feb 2025 15:19:41 +0000
From: <alucerop@....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 v10 17/26] 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 | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/ethernet/sfc/efx_cxl.c b/drivers/net/ethernet/sfc/efx_cxl.c
index a9ff84143e5d..984dc2ee522d 100644
--- a/drivers/net/ethernet/sfc/efx_cxl.c
+++ b/drivers/net/ethernet/sfc/efx_cxl.c
@@ -121,6 +121,14 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
 		goto err_regs;
 	}
 
+	cxl->cxled = cxl_request_dpa(cxl->cxlmd, true, EFX_CTPIO_BUFFER_SIZE);
+	if (IS_ERR(cxl->cxled)) {
+		pci_err(pci_dev, "CXL accel request DPA failed");
+		rc = PTR_ERR(cxl->cxled);
+		cxl_put_root_decoder(cxl->cxlrd);
+		goto err_regs;
+	}
+
 	probe_data->cxl = cxl;
 
 	return 0;
@@ -134,6 +142,7 @@ 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_dpa_free(probe_data->cxl->cxled);
 		cxl_put_root_decoder(probe_data->cxl->cxlrd);
 		kfree(probe_data->cxl);
 	}
-- 
2.17.1