On Fri, 22 Jan 2021 09:11:20 -0800 Keith Busch <kbusch@xxxxxxxxxx> wrote: > Each bio_vec segment is physically contiguous. What's the official way to get that buffer's physical address? I couldn't find any driver that does DMA to the bio buffer, to use as an example. Maybe used wrong keywords. > > I grepped around, but apparently no driver under drivers/block does > > direct DMA to the bio buffer. They all use their own buffer and memcpy, > > like this patch. ps3vram, ps3disk, amiflop, etc etc. > > block/brd.c That uses memcpy, not DMA? It uses the virtual address. I was hoping for an example that does direct DMA to the bio_data buffer. - Lauri
