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From: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
To: "Paul Cercueil" <paul@crapouillou.net>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Sumit Semwal" <sumit.semwal@linaro.org>,
	"Christian König" <christian.koenig@amd.com>
Cc: michael.hennerich@analog.com, nuno.sa@analog.com,
	linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org,
	linaro-mm-sig@lists.linaro.org
Subject: Re: [PATCH v2 0/3] usb: gadget: functionfs: DMABUF import interface
Date: Fri, 31 Mar 2023 11:40:58 +0200	[thread overview]
Message-ID: <c6ce737d-25cc-7f22-7c0f-c0ba1420e57d@collabora.com> (raw)
In-Reply-To: <20230322092118.9213-1-paul@crapouillou.net>

Hi Paul,

W dniu 22.03.2023 o 10:21, Paul Cercueil pisze:
> 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.
> 

Can you share an example use case for these new features?
Is there a userspace that excercises the new ioctls?

Regards,

Andrzej

  parent reply	other threads:[~2023-03-31  9:41 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-03-22  9:21 Paul Cercueil
2023-03-22  9:21 ` [PATCH v2 1/3] usb: gadget: Support already-mapped DMA SGs Paul Cercueil
2023-03-22  9:21 ` [PATCH v2 2/3] usb: gadget: functionfs: Factorize wait-for-endpoint code Paul Cercueil
2023-03-22  9:21 ` [PATCH v2 3/3] usb: gadget: functionfs: Add DMABUF import interface Paul Cercueil
2023-03-31  9:40 ` Andrzej Pietrasiewicz [this message]
2023-04-01 14:31   ` [PATCH v2 0/3] usb: gadget: functionfs: " Paul Cercueil

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