linux-kernel - Re: [PATCH/RFC 5/5] usb: Add support for streams alloc/dealloc to devio.c

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Message-ID: <8196aa784ab3686cb19581131df0be16.squirrel@www.codeaurora.org>
Date:	Fri, 17 Jun 2011 01:55:40 -0700 (PDT)
From:	ablay@...eaurora.org
To:	"Greg KH" <greg@...ah.com>
Cc:	"Felipe Balbi" <balbi@...com>,
	"Tatyana Brokhman" <tlinder@...eaurora.org>,
	linux-usb@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	"open list" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH/RFC 5/5] usb: Add support for streams alloc/dealloc to 
     devio.c

> On Thu, Jun 16, 2011 at 07:28:40PM +0300, Felipe Balbi wrote:
>> On Thu, Jun 16, 2011 at 04:31:07PM +0300, Tatyana Brokhman wrote:
>> > Allow user space applications such as LIBUSB, to request
>> > streams alloc/dealloc from HCD that implements XHCI.
>> >
>> > Signed-off-by: Amit Blay <ablay@...lcomm.com>
>> > Signed-off-by: Tatyana Brokhman <tlinder@...eaurora.org>
>>
>> other than what Alan said, this needs major splitting. This patch is too
>> big. First we need to discuss the ABI details with the guys at
>> libusb-devel, then we implement.
>
> No, we don't break the abi, but rather, create a new one for streams,
> and then we can work on adding them to libusb, which should be quite
> easy when done.
>
> thanks,
>
> greg k-h
>

My name is Amit Blay, I'm working with Tatyana Brokhman, I originally
created this patch. I want to make sure I understand the solution:

We will create a new IOCTL, i.e., USBDEVFS_SUBMITURB_SS. This IOCTL will
pass new URB structure, usbdevfs_urb_ss, which will hold the "legacy" URB
and in addition the stream_id. libusb will be able to use the new ABI
whenever SuperSpeed streams are required.

Is this correct?

Thanks,
Amit Blay,
---
Sent by an consultant of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.


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