netdev - [PATCH v8 16/27] sfc: obtain root decoder with enough HPA free space

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Message-ID: <20241216161042.42108-17-alejandro.lucero-palau@amd.com>
Date: Mon, 16 Dec 2024 16:10:31 +0000
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>, <dave.jiang@...el.com>
CC: Alejandro Lucero <alucerop@....com>
Subject: [PATCH v8 16/27] sfc: obtain root decoder with enough HPA free space

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

Asking for available HPA space is the previous step to try to obtain
an HPA range suitable to accel driver purposes.

Add this call to efx cxl initialization.

Signed-off-by: Alejandro Lucero <alucerop@....com>
Reviewed-by: Martin Habets <habetsm.xilinx@...il.com>
---
 drivers/net/ethernet/sfc/efx_cxl.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/net/ethernet/sfc/efx_cxl.c b/drivers/net/ethernet/sfc/efx_cxl.c
index 70b47b7f4d5a..253c82c61f43 100644
--- a/drivers/net/ethernet/sfc/efx_cxl.c
+++ b/drivers/net/ethernet/sfc/efx_cxl.c
@@ -23,6 +23,7 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
 	struct efx_nic *efx = &probe_data->efx;
 	DECLARE_BITMAP(expected, CXL_MAX_CAPS);
 	DECLARE_BITMAP(found, CXL_MAX_CAPS);
+	resource_size_t max_size;
 	struct pci_dev *pci_dev;
 	struct efx_cxl *cxl;
 	struct resource res;
@@ -103,6 +104,23 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
 		goto err_memdev;
 	}
 
+	cxl->cxlrd = cxl_get_hpa_freespace(cxl->cxlmd,
+					   CXL_DECODER_F_RAM | CXL_DECODER_F_TYPE2,
+					   &max_size);
+
+	if (IS_ERR(cxl->cxlrd)) {
+		pci_err(pci_dev, "cxl_get_hpa_freespace failed\n");
+		rc = PTR_ERR(cxl->cxlrd);
+		goto err_memdev;
+	}
+
+	if (max_size < EFX_CTPIO_BUFFER_SIZE) {
+		pci_err(pci_dev, "%s: not enough free HPA space %pap < %u\n",
+			__func__, &max_size, EFX_CTPIO_BUFFER_SIZE);
+		rc = -ENOSPC;
+		goto err_memdev;
+	}
+
 	probe_data->cxl = cxl;
 
 	return 0;
-- 
2.17.1