linux-kernel - [RFC PATCH 10/25] NTB/msi: Support offsetted partial memory window for MSI

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Message-ID: <20251023071916.901355-11-den@valinux.co.jp>
Date: Thu, 23 Oct 2025 16:19:01 +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 10/25] NTB/msi: Support offsetted partial memory window for MSI

The NTB API functions ntb_mw_set_trans() and ntb_mw_get_align() now
support non-zero MW offsets. Update ntb/msi to make use of this
capability by propagating the alignment offset when setting up a MW
translation for MSI.

Signed-off-by: Koichiro Den <den@...inux.co.jp>
---
 drivers/ntb/msi.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/ntb/msi.c b/drivers/ntb/msi.c
index 8875bcbf2ea4..4dc134cf404f 100644
--- a/drivers/ntb/msi.c
+++ b/drivers/ntb/msi.c
@@ -97,7 +97,7 @@ int ntb_msi_setup_mws(struct ntb_dev *ntb)
 	struct msi_desc *desc;
 	u64 addr;
 	int peer, peer_widx;
-	resource_size_t addr_align, size_align, size_max;
+	resource_size_t addr_align, size_align, size_max, offset;
 	resource_size_t mw_size = SZ_32K;
 	resource_size_t mw_min_size = mw_size;
 	int i;
@@ -132,7 +132,7 @@ int ntb_msi_setup_mws(struct ntb_dev *ntb)
 		}
 
 		ret = ntb_mw_get_align(ntb, peer, peer_widx, NULL,
-				       &size_align, &size_max, NULL);
+				       &size_align, &size_max, &offset);
 		if (ret)
 			goto error_out;
 
@@ -142,7 +142,7 @@ int ntb_msi_setup_mws(struct ntb_dev *ntb)
 			mw_min_size = mw_size;
 
 		ret = ntb_mw_set_trans(ntb, peer, peer_widx,
-				       addr, mw_size, 0);
+				       addr, mw_size, offset);
 		if (ret)
 			goto error_out;
 	}
-- 
2.48.1