netdev - [PATCH v4 18/26] sfc: get endpoint decoder

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Message-ID: <20241017165225.21206-19-alejandro.lucero-palau@amd.com>
Date: Thu, 17 Oct 2024 17:52:17 +0100
From: <alejandro.lucero-palau@....com>
To: <linux-cxl@...r.kernel.org>, <netdev@...r.kernel.org>,
	<dan.j.williams@...el.com>, <martin.habets@...inx.com>,
	<edward.cree@....com>, <davem@...emloft.net>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <edumazet@...gle.com>
CC: Alejandro Lucero <alucerop@....com>
Subject: [PATCH v4 18/26] sfc: get endpoint decoder

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

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

Signed-off-by: Alejandro Lucero <alucerop@....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 399bd60f2e40..c0da75b2d8e1 100644
--- a/drivers/net/ethernet/sfc/efx_cxl.c
+++ b/drivers/net/ethernet/sfc/efx_cxl.c
@@ -119,6 +119,14 @@ int efx_cxl_init(struct efx_nic *efx)
 		goto err3;
 	}
 
+	cxl->cxled = cxl_request_dpa(cxl->cxlmd, true, EFX_CTPIO_BUFFER_SIZE,
+				     EFX_CTPIO_BUFFER_SIZE);
+	if (!cxl->cxled || IS_ERR(cxl->cxled)) {
+		pci_err(pci_dev, "CXL accel request DPA failed");
+		rc = PTR_ERR(cxl->cxlrd);
+		goto err3;
+	}
+
 	efx->cxl = cxl;
 #endif
 
@@ -140,6 +148,7 @@ void efx_cxl_exit(struct efx_nic *efx)
 {
 #if IS_ENABLED(CONFIG_CXL_BUS)
 	if (efx->cxl) {
+		cxl_dpa_free(efx->cxl->cxled);
 		cxl_release_resource(efx->cxl->cxlds, CXL_RES_RAM);
 		kfree(efx->cxl->cxlds);
 		kfree(efx->cxl);
-- 
2.17.1