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author | David Gibson <david@gibson.dropbear.id.au> | 2012-06-27 14:50:42 +1000 |
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committer | Anthony Liguori <aliguori@us.ibm.com> | 2012-06-27 16:33:25 -0500 |
commit | e2f89926f19d2940eda070542501f39f51a8c81f (patch) | |
tree | fc401c153274ea7a3c3a825082e1e20905df842d /dma.h | |
parent | 10ca2943aab6646839769d78f80b0d5499efcbe9 (diff) |
usb: Convert usb_packet_{map, unmap} to universal DMA helpers
The USB UHCI and EHCI drivers were converted some time ago to use the
pci_dma_*() helper functions. However, this conversion was not complete
because in some places both these drivers do DMA via the usb_packet_map()
function in usb-libhw.c. That function directly used
cpu_physical_memory_map().
Now that the sglist code uses DMA wrappers properly, we can convert the
functions in usb-libhw.c, thus conpleting the conversion of UHCI and EHCI
to use the DMA wrappers.
Note that usb_packet_map() invokes dma_memory_map() with a NULL invalidate
callback function. When IOMMU support is added, this will mean that
usb_packet_map() and the corresponding usb_packet_unmap() must be called in
close proximity without dropping the qemu device lock - otherwise the guest
might invalidate IOMMU mappings while they are still in use by the device
code.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'dma.h')
0 files changed, 0 insertions, 0 deletions