We need to be able to convert back from DMA addresses to implement
bus_to_phys(). Will try to push this upstream.
Signed-off-by: Piotr Jaroszyński <p.jaroszyn...@gmail.com>
---
src/include/gpxe/linux/uio-dma.h | 23 +++++++++++++++++++++++
1 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/src/include/gpxe/linux/uio-dma.h b/src/include/gpxe/linux/uio-dma.h
index 16bd0dc..07388e4 100644
--- a/src/include/gpxe/linux/uio-dma.h
+++ b/src/include/gpxe/linux/uio-dma.h
@@ -160,6 +160,29 @@ static inline uint64_t uio_dma_addr(struct uio_dma_mapping
*m, uint8_t *addr, un
return m->dmaddr[chunk] + offset;
}
+/**
+ * Map DMA address back to the user-space region.
+ *
+ * @param m pointer to @see uio_dma_mapping
+ * @param dma_addr the dma_addr
+ * @param len length of the memory region
+ * @return maddr or NULL if address could not be mapped
+ */
+static inline uint8_t *uio_maddr(struct uio_dma_mapping *m, uint64_t dma_addr,
unsigned int len)
+{
+ unsigned long chunk, chunk_size;
+
+ chunk_size = (1 << m->chunk_shift);
+ if (len > chunk_size)
+ return NULL;
+
+ for (chunk = 0 ; chunk < m->chunk_count ; ++chunk)
+ if (dma_addr + len - m->dmaddr[chunk] <= chunk_size)
+ return m->addr + chunk * chunk_size + dma_addr -
m->dmaddr[chunk];
+
+ return NULL;
+}
+
#ifdef __cplusplus
}
#endif
--
1.7.1
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