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authorDavid Gibson <david@gibson.dropbear.id.au>2012-06-27 14:50:42 +1000
committerAnthony Liguori <aliguori@us.ibm.com>2012-06-27 16:33:25 -0500
commite2f89926f19d2940eda070542501f39f51a8c81f (patch)
treefc401c153274ea7a3c3a825082e1e20905df842d /dma.h
parent10ca2943aab6646839769d78f80b0d5499efcbe9 (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>
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