netdev - [PATCH v22 14/25] sfc: obtain decoder and region if committed by firmware

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Message-ID: <20251205115248.772945-15-alejandro.lucero-palau@amd.com>
Date: Fri, 5 Dec 2025 11:52:37 +0000
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 v22 14/25] sfc: obtain decoder and region if committed by firmware

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

Check if device HDM is already committed during firmware/BIOS
initialization.

A CXL region should exist if so after memdev allocation/initialization.
Get HPA from region and map it.

Signed-off-by: Alejandro Lucero <alucerop@....com>
---
 drivers/net/ethernet/sfc/efx_cxl.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/net/ethernet/sfc/efx_cxl.c b/drivers/net/ethernet/sfc/efx_cxl.c
index f6eda93e67e2..ad1f49e76179 100644
--- a/drivers/net/ethernet/sfc/efx_cxl.c
+++ b/drivers/net/ethernet/sfc/efx_cxl.c
@@ -19,6 +19,7 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
 	struct efx_nic *efx = &probe_data->efx;
 	struct pci_dev *pci_dev = efx->pci_dev;
 	struct efx_cxl *cxl;
+	struct range range;
 	u16 dvsec;
 	int rc;
 
@@ -90,6 +91,26 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
 		return PTR_ERR(cxl->cxlmd);
 	}
 
+	cxl->cxled = cxl_get_committed_decoder(cxl->cxlmd, &cxl->efx_region);
+	if (cxl->cxled) {
+		if (!cxl->efx_region) {
+			pci_err(pci_dev, "CXL found committed decoder without a region");
+			return -ENODEV;
+		}
+		rc = cxl_get_region_range(cxl->efx_region, &range);
+		if (rc) {
+			pci_err(pci_dev,
+				"CXL getting regions params from a committed decoder failed");
+			return rc;
+		}
+
+		cxl->ctpio_cxl = ioremap(range.start, range.end - range.start + 1);
+		if (!cxl->ctpio_cxl) {
+			pci_err(pci_dev, "CXL ioremap region (%pra) failed", &range);
+			return -ENOMEM;
+		}
+	}
+
 	probe_data->cxl = cxl;
 
 	return 0;
@@ -97,6 +118,12 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
 
 void efx_cxl_exit(struct efx_probe_data *probe_data)
 {
+	if (!probe_data->cxl)
+		return;
+
+	iounmap(probe_data->cxl->ctpio_cxl);
+	cxl_decoder_detach(NULL, probe_data->cxl->cxled, 0, DETACH_INVALIDATE);
+	unregister_region(probe_data->cxl->efx_region);
 }
 
 MODULE_IMPORT_NS("CXL");
-- 
2.34.1