usb: core: add dma-noncoherent buffer alloc and free API

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This will add usb_alloc_noncoherent() and usb_free_noncoherent()
functions to support alloc and free buffer in a dma-noncoherent way.

To explicit manage the memory ownership for the kernel and device,
this will also add usb_dma_noncoherent_sync_for_cpu/device() functions
and call it at proper time.  The management requires the user save
sg_table returned by usb_alloc_noncoherent() to urb->sgt.

Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Reviewed-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20250704095751.73765-2-xu.yang_2@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Xu Yang 2025-07-04 17:57:49 +08:00 • committed by Greg Kroah-Hartman

parent d1b07cc086

commit 488e6eaab8

3 changed files with 112 additions and 8 deletions

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29

drivers/usb/core/hcd.c

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80

drivers/usb/core/usb.c

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11

include/linux/usb.h

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