summaryrefslogtreecommitdiff
path: root/include/linux/dmaengine.h
diff options
context:
space:
mode:
authorChris Leech <christopher.leech@intel.com>2006-05-24 04:50:37 +0400
committerDavid S. Miller <davem@sunset.davemloft.net>2006-06-18 08:25:46 +0400
commitde5506e155276d385712c2aa1c2d9a27cd4ed947 (patch)
tree219c30dab27b9aef2597d8735dfc19db8454849e /include/linux/dmaengine.h
parentdb21733488f84a596faaad0d05430b3f51804692 (diff)
downloadlinux-de5506e155276d385712c2aa1c2d9a27cd4ed947.tar.xz
[I/OAT]: Utility functions for offloading sk_buff to iovec copies
Provides for pinning user space pages in memory, copying to iovecs, and copying from sk_buffs including fragmented and chained sk_buffs. Signed-off-by: Chris Leech <christopher.leech@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/dmaengine.h')
-rw-r--r--include/linux/dmaengine.h22
1 files changed, 22 insertions, 0 deletions
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 30781546ac99..78b236ca04f8 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -333,5 +333,27 @@ static inline enum dma_status dma_async_is_complete(dma_cookie_t cookie,
int dma_async_device_register(struct dma_device *device);
void dma_async_device_unregister(struct dma_device *device);
+/* --- Helper iov-locking functions --- */
+
+struct dma_page_list {
+ char *base_address;
+ int nr_pages;
+ struct page **pages;
+};
+
+struct dma_pinned_list {
+ int nr_iovecs;
+ struct dma_page_list page_list[0];
+};
+
+struct dma_pinned_list *dma_pin_iovec_pages(struct iovec *iov, size_t len);
+void dma_unpin_iovec_pages(struct dma_pinned_list* pinned_list);
+
+dma_cookie_t dma_memcpy_to_iovec(struct dma_chan *chan, struct iovec *iov,
+ struct dma_pinned_list *pinned_list, unsigned char *kdata, size_t len);
+dma_cookie_t dma_memcpy_pg_to_iovec(struct dma_chan *chan, struct iovec *iov,
+ struct dma_pinned_list *pinned_list, struct page *page,
+ unsigned int offset, size_t len);
+
#endif /* CONFIG_DMA_ENGINE */
#endif /* DMAENGINE_H */