linux-kernel - [PATCH v2 0/3] usb: gadget: functionfs: DMABUF import interface

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Message-Id: <20230322092118.9213-1-paul@crapouillou.net>
Date:   Wed, 22 Mar 2023 10:21:15 +0100
From:   Paul Cercueil <paul@...pouillou.net>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>
Cc:     michael.hennerich@...log.com, nuno.sa@...log.com,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org,
        Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH v2 0/3] usb: gadget: functionfs: DMABUF import interface

Hi,

This small patchset adds three new IOCTLs that can be used to attach,
detach, or transfer from/to a DMABUF object.

Changes since v1:
- patch [2/3] is new. I had to reuse a piece of code that was already
  duplicated in the driver, so I factorized the code.
- Make ffs_dma_resv_lock() static
- Add MODULE_IMPORT_NS(DMA_BUF);
- The attach/detach functions are now performed without locking the
  eps_lock spinlock. The transfer function starts with the spinlock
  unlocked, then locks it before allocating and queueing the USB
  transfer.

Cheers,
-Paul

Paul Cercueil (3):
  usb: gadget: Support already-mapped DMA SGs
  usb: gadget: functionfs: Factorize wait-for-endpoint code
  usb: gadget: functionfs: Add DMABUF import interface

 drivers/usb/gadget/function/f_fs.c  | 467 ++++++++++++++++++++++++++--
 drivers/usb/gadget/udc/core.c       |   7 +-
 include/linux/usb/gadget.h          |   2 +
 include/uapi/linux/usb/functionfs.h |  14 +-
 4 files changed, 468 insertions(+), 22 deletions(-)

-- 
2.39.2