David Brownell fbf54dd320 USB: usb/dma doc updates ... This patch updates some of the documentation about DMA buffer management for USB, and ways to avoid extra copying. Our understanding of the issues has improved over time. - Most drivers should *avoid* the dma-coherent allocators. There are a few exceptions (like the HID driver). - Some methods are currently commented out; it seems folk writing USB drivers aren't doing performance tuning at that level yet. - Just avoid highmem; there's no good way to pass an "I can do highmem DMA" capability through a driver stack. This is easy, everything already avoids highmem. But it'd be nice if x86_32 systems with much physical memory could use it directly with network adapters and mass storage devices. (Patch, anyone?) Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>		2007-07-12 16:34:42 -07:00
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acm.txt
auerswald.txt
CREDITS	documentation: convert the Documentation directory to UTF-8	2007-05-09 08:58:19 +02:00
dma.txt	USB: usb/dma doc updates	2007-07-12 16:34:42 -07:00
ehci.txt
error-codes.txt
gadget_serial.txt
hiddev.txt
hotplug.txt
linux.inf
mtouchusb.txt
ohci.txt
persist.txt	USB: add power/persist device attribute	2007-07-12 16:34:30 -07:00
proc_usb_info.txt
rio.txt
uhci.txt
URB.txt
usb-help.txt
usb-serial.txt	documentation: convert the Documentation directory to UTF-8	2007-05-09 08:58:19 +02:00
usbmon.txt