linux-kernel - [RFC PATCH 08/25] PCI: endpoint: pci-epf-vntb: Propagate MW offset from configfs when present

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Message-ID: <20251023071916.901355-9-den@valinux.co.jp>
Date: Thu, 23 Oct 2025 16:18:59 +0900
From: Koichiro Den <den@...inux.co.jp>
To: ntb@...ts.linux.dev,
	linux-pci@...r.kernel.org,
	dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org
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Subject: [RFC PATCH 08/25] PCI: endpoint: pci-epf-vntb: Propagate MW offset from configfs when present

The NTB API functions ntb_mw_set_trans() and ntb_mw_get_align() now
support non-zero MW offsets. Update pci-epf-vntb to populate
mws_offset[idx] when the offset parameter is provided. Users can now get
the offset value and use it on ntb_mw_set_trans().

Signed-off-by: Koichiro Den <den@...inux.co.jp>
---
 drivers/pci/endpoint/functions/pci-epf-vntb.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pci/endpoint/functions/pci-epf-vntb.c b/drivers/pci/endpoint/functions/pci-epf-vntb.c
index becfad483643..6495f99ffd4f 100644
--- a/drivers/pci/endpoint/functions/pci-epf-vntb.c
+++ b/drivers/pci/endpoint/functions/pci-epf-vntb.c
@@ -1413,6 +1413,9 @@ static int vntb_epf_mw_get_align(struct ntb_dev *ndev, int pidx, int idx,
 	if (size_max)
 		*size_max = ntb->mws_size[idx];
 
+	if (offset)
+		*offset = ntb->mws_offset[idx];
+
 	return 0;
 }
 
-- 
2.48.1