linux-kernel - [PATCH 1/4] NTB: ntb_transport: Handle remapped contiguous region in vmalloc space

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Message-ID: <20251027004331.562345-2-den@valinux.co.jp>
Date: Mon, 27 Oct 2025 09:43:28 +0900
From: Koichiro Den <den@...inux.co.jp>
To: ntb@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Cc: jdmason@...zu.us,
	dave.jiang@...el.com,
	allenbh@...il.com
Subject: [PATCH 1/4] NTB: ntb_transport: Handle remapped contiguous region in vmalloc space

The RX buffer virtual address may reside in vmalloc space depending on
the allocation path, where virt_to_page() is invalid.

Use a helper that chooses vmalloc_to_page() or virt_to_page() as
appropriate. This is safe since the buffer is guaranteed to be
physically contiguous.

Signed-off-by: Koichiro Den <den@...inux.co.jp>
---
 drivers/ntb/ntb_transport.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index eb875e3db2e3..b9f9d2e0feb3 100644
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -1546,6 +1546,11 @@ static void ntb_memcpy_rx(struct ntb_queue_entry *entry, void *offset)
 	ntb_rx_copy_callback(entry, NULL);
 }
 
+static inline struct page *ntb_vaddr_to_page(const void *addr)
+{
+	return is_vmalloc_addr(addr) ? vmalloc_to_page(addr) : virt_to_page(addr);
+}
+
 static int ntb_async_rx_submit(struct ntb_queue_entry *entry, void *offset)
 {
 	struct dma_async_tx_descriptor *txd;
@@ -1570,7 +1575,7 @@ static int ntb_async_rx_submit(struct ntb_queue_entry *entry, void *offset)
 		goto err;
 
 	unmap->len = len;
-	unmap->addr[0] = dma_map_page(device->dev, virt_to_page(offset),
+	unmap->addr[0] = dma_map_page(device->dev, ntb_vaddr_to_page(offset),
 				      pay_off, len, DMA_TO_DEVICE);
 	if (dma_mapping_error(device->dev, unmap->addr[0]))
 		goto err_get_unmap;
-- 
2.48.1