Messages in this thread |  | | From | Gerd Knorr <> | Subject | Re: DMA to/from user buffers | Date | 4 Sep 2001 19:30:49 GMT |
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Sebastian Heidl wrote: > > Hi, > > two questions about using an user-supplied buffer (e.g. malloced > in user space) for DMA transfers: > > 1. Is it possible ? > 2. What restrictions/requirements apply for the buffer (alignment...) ? > > Documentation/DMA-mapping.txt only talks about buffers allocated in > kernel space.
Lock down the user pages using kiobufs (see include/linux/iobufs.h), then feed these pages to the pci_* functions.
Gerd
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