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Mon, 28 Apr 2025 16:07:24 -0700 (PDT) Received: from [192.168.1.14] ([38.175.170.29]) by smtp.gmail.com with ESMTPSA id 8926c6da1cb9f-4f8631a1327sm31454173.142.2025.04.28.16.07.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 28 Apr 2025 16:07:24 -0700 (PDT) Message-ID: <097ad0fd-db38-4174-8e34-4ceb485e7e23@linuxfoundation.org> Date: Mon, 28 Apr 2025 17:07:23 -0600 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] usbip: set the dma mask to 64bit default for vhci-driver To: Greg KH , Zongmin Zhou Cc: Christoph Hellwig , i@zenithal.me, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, shuah@kernel.org, valentina.manea.m@gmail.com, Zongmin Zhou , Shuah Khan References: <3e1f8fab-0155-4ff9-800d-5fa9df88c48c@linuxfoundation.org> <20250422063409.607859-1-min_halo@163.com> <4c6660a6-29ce-4b97-b092-8fc15585e52a@163.com> <2025042512-corsage-handpick-bf2a@gregkh> <575ce02c-9128-4098-a852-d9e14f14010e@163.com> <2025042812-sinister-shaping-bded@gregkh> Content-Language: en-US From: Shuah Khan In-Reply-To: <2025042812-sinister-shaping-bded@gregkh> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 4/28/25 04:04, Greg KH wrote: > A: http://en.wikipedia.org/wiki/Top_post > Q: Were do I find info about this thing called top-posting? > A: Because it messes up the order in which people normally read text. > Q: Why is top-posting such a bad thing? > A: Top-posting. > Q: What is the most annoying thing in e-mail? > > A: No. > Q: Should I include quotations after my reply? > > http://daringfireball.net/2007/07/on_top > > On Mon, Apr 28, 2025 at 05:51:08PM +0800, Zongmin Zhou wrote: >> Dear Greg and Shuah, >> >> I found out that the vhci-hcd driver added this virtual device >> as a platform device from the very beginning since 2014. > > Ah, I should have caught it back then, but at the time there really > wasn't another option. > >> I'm just getting in touch with this module and >> don't have a deep understanding of it，shuah should be clearer. faux_device should work fine for this. We do have to test of course. There are several examples of converting platform device to faux device. 72239a78f9f5b9f05ea4bb7a15b92807906dab71 dcd2a9a5550ef556c8fc11601a0f729fb71ead5d > > See the recent patches I did converting drivers to use the faux bus > code, it should be pretty simple to do. > >> I don't know if using the faux bus to replace the platform bus can solve the >> problem that the error limitation on max_hw_sectors for usbip device >> since commit d74ffae8b8dd applied. > > That is for the storage driver, not usbip. As the faux bus does not > have any real dma operations, this should cause it to work properly > given the default values involed, but that's up to you to test to verify > it does just that. Try it and see! > >> But this change will request user to update kernel version to support faux >> bus. > > That's just a normal kernel update to a newer version, what is wrong > with that? With one difference that the fix depends on faux_device feature - hence we can't apply it to stables. I do think it is the right direction to go to faux_device. > >> This will also be an expensive change to fix the problem? > > Fixing things properly is the correct thing to do in all cases. > Zongmin, do let me know if you are unable to make the change. thanks, -- Shuah