netdev - [PATCH v4 07/26] sfc: use cxl api for regs setup and checking

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Message-ID: <20241017165225.21206-8-alejandro.lucero-palau@amd.com>
Date: Thu, 17 Oct 2024 17:52:06 +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 07/26] sfc: use cxl api for regs setup and checking

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

Use cxl code for registers discovery and mapping.

Validate capabilities found based on those registers against expected
capabilities.

Signed-off-by: Alejandro Lucero <alucerop@....com>
---
 drivers/net/ethernet/sfc/efx_cxl.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/net/ethernet/sfc/efx_cxl.c b/drivers/net/ethernet/sfc/efx_cxl.c
index fb3eef339b34..749aa97683fd 100644
--- a/drivers/net/ethernet/sfc/efx_cxl.c
+++ b/drivers/net/ethernet/sfc/efx_cxl.c
@@ -22,6 +22,8 @@ int efx_cxl_init(struct efx_nic *efx)
 {
 #if IS_ENABLED(CONFIG_CXL_BUS)
 	struct pci_dev *pci_dev = efx->pci_dev;
+	DECLARE_BITMAP(expected, CXL_MAX_CAPS);
+	DECLARE_BITMAP(found, CXL_MAX_CAPS);
 	struct efx_cxl *cxl;
 	struct resource res;
 	u16 dvsec;
@@ -64,6 +66,23 @@ int efx_cxl_init(struct efx_nic *efx)
 		goto err2;
 	}
 
+	rc = cxl_pci_accel_setup_regs(pci_dev, cxl->cxlds);
+	if (rc) {
+		pci_err(pci_dev, "CXL accel setup regs failed");
+		goto err2;
+	}
+
+	bitmap_clear(expected, 0, BITS_PER_TYPE(unsigned long));
+	bitmap_set(expected, CXL_DEV_CAP_HDM, 1);
+	bitmap_set(expected, CXL_DEV_CAP_RAS, 1);
+
+	if (!cxl_pci_check_caps(cxl->cxlds, expected, found)) {
+		pci_err(pci_dev,
+			"CXL device capabilities found(%08lx) not as expected(%08lx)",
+			*found, *expected);
+		goto err2;
+	}
+
 	efx->cxl = cxl;
 #endif
 
-- 
2.17.1