hi all: 2011/10/31, Stefan Richter <stefanr@xxxxxxxxxxxxxxxxx>: > On Oct 31 Julian Calaby wrote: >> Hi, >> >> On Mon, Oct 31, 2011 at 12:53, yoma sophian <sophian.yoma@xxxxxxxxx> >> wrote: >> > hi stefan: >> > Thanks for your reply. >> > 2011/10/30, Stefan Richter <stefanr@xxxxxxxxxxxxxxxxx>: >> >> The low level driver, not SCSI core, is responsible to obtain a DMA >> >> address. >> > >> > Why I ask this because I found there is no same transformation for >> > scsi usb subsystem. >> > Would anyone can let me know where it is? >> >> I am not familiar with the code in question, but I would guess that >> this would happen in the USB Controller Interface driver. > > I don't know the USB subsystem either. Anyway, in this case the > "SCSI low-level" (i.e. SCSI transport and interconnect driver) > internally consists of USB high-level (storage), USB core, and USB > low-level (UHCI, EHCI or whatever). "grep -r dma_map_sg drivers/usb/" > shows occurrences of scatter-gather list DMA mappings in the USB core. I > haven't checked whether these are indeed the ones that the usb-storage > driver relies on. I will check where you mentioned. appreciate your kind help, -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
