Re: kmap for dma buffer

> For dma transfers to/from user space buffer, one need to lock that user > space buffer so that it won't be swaped out. and also > its bus address is obtained by call virt_to_bus and then this bus address > is written to dma controller. Thats what the kiovecs deal with yes > but do we

Re: kmap for dma buffer

For dma transfers to/from user space buffer, one need to lock that user space buffer so that it won't be swaped out. and also its bus address is obtained by call virt_to_bus and then this bus address is written to dma controller. Thats what the kiovecs deal with yes but do we explicitly

kmap for dma buffer

hi all, For dma transfers to/from user space buffer, one need to lock that user space buffer so that it won't be swaped out. and also its bus address is obtained by call virt_to_bus and then this bus address is written to dma controller. but do we explicitly need to map that user buffer into

kmap for dma buffer

hi all, For dma transfers to/from user space buffer, one need to lock that user space buffer so that it won't be swaped out. and also its bus address is obtained by call virt_to_bus and then this bus address is written to dma controller. but do we explicitly need to map that user buffer into