linux-kernel - [PATCH] tools/virtio: Add DMA_MAPPING

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Message-Id: <20250113090231.169149-1-wangyufeng@kylinos.cn>
Date: Mon, 13 Jan 2025 17:02:31 +0800
From: Yufeng Wang <wangyufeng@...inos.cn>
To: "Michael S . Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Yufeng Wang <wangyufeng@...inos.cn>,
	Eugenio Pérez <eperezma@...hat.com>,
	virtualization@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH] tools/virtio: Add DMA_MAPPING_ERROR define for virtio test

Fixes: <c7e1b422afac>("virtio_ring: perform premapped operations based on per-buffer")
also add DMA_MAPPING_ERROR define for virtio test.

Signed-off-by: Yufeng Wang <wangyufeng@...inos.cn>
---
 tools/virtio/linux/dma-mapping.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tools/virtio/linux/dma-mapping.h b/tools/virtio/linux/dma-mapping.h
index 822ecaa8e4df..6e6e443c53d4 100644
--- a/tools/virtio/linux/dma-mapping.h
+++ b/tools/virtio/linux/dma-mapping.h
@@ -43,4 +43,16 @@ enum dma_data_direction {
 } while (0)
 #define dma_max_mapping_size(...) SIZE_MAX
 
+/*
+ * A dma_addr_t can hold any valid DMA or bus address for the platform.  It can
+ * be given to a device to use as a DMA source or target.  It is specific to a
+ * given device and there may be a translation between the CPU physical address
+ * space and the bus address space.
+ *
+ * DMA_MAPPING_ERROR is the magic error code if a mapping failed.  It should not
+ * be used directly in drivers, but checked for using dma_mapping_error()
+ * instead.
+ */
+#define DMA_MAPPING_ERROR		(~(dma_addr_t)0)
+
 #endif
-- 
2.34.1