lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <e0886f9e-bcc1-48dc-a175-2147d8d4fc3e@oss.qualcomm.com>
Date: Sat, 2 Aug 2025 14:39:48 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: Vinod Koul <vkoul@...nel.org>, Sven Peter <sven@...nel.org>,
        Janne Grunau <j@...nau.net>, Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Neal Gompa <neal@...pa.dev>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>,
        Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>,
        Paul Cercueil <paul@...pouillou.net>,
        Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
        Viresh Kumar <vireshk@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Frank Li <Frank.Li@....com>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        Taichi Sugaya <sugaya.taichi@...ionext.com>,
        Takao Orito <orito.takao@...ionext.com>,
        Andreas Färber
 <afaerber@...e.de>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Patrice Chotard <patrice.chotard@...s.st.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Amélie Delaunay <amelie.delaunay@...s.st.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Chen-Yu Tsai
 <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Laxman Dewangan
 <ldewangan@...dia.com>,
        Jon Hunter <jonathanh@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Peter Ujfalusi <peter.ujfalusi@...il.com>,
        Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Michal Simek <michal.simek@....com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Rob Herring <robh@...nel.org>, Saravana Kannan <saravanak@...gle.com>,
        Martin Povišer <povik+lin@...ebit.org>,
        Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Mukesh Kumar Savaliya <quic_msavaliy@...cinc.com>,
        Viken Dadhaniya <quic_vdadhani@...cinc.com>,
        Andi Shyti <andi.shyti@...nel.org>,
        Krzysztof Kozlowski
 <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-rpi-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
        imx@...ts.linux.dev, linux-actions@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com, linux-sunxi@...ts.linux.dev,
        linux-tegra@...r.kernel.org, devicetree@...r.kernel.org,
        linux-sound@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-spi@...r.kernel.org
Subject: Re: [PATCH RFC 3/6] dmaengine: qcom: gpi: Accept protocol ID hints

On 7/30/25 1:32 PM, Geert Uytterhoeven wrote:
> Hi Konrad,
> 
> On Wed, 30 Jul 2025 at 11:35, Konrad Dybcio <konradybcio@...nel.org> wrote:
>> From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
>>
>> Client drivers may now pass hints to dmaengine drivers. GPI DMA's only
>> consumers (GENI SEs) need to pass a protocol (I2C, I3C, SPI, etc.) ID
>> to the DMA engine driver, for it to take different actions.
>>
>> Currently, that's done through passing that ID through device tree,
>> with each Serial Engine expressed NUM_PROTOCOL times, resulting in
>> terrible dt-bindings that are full of useless copypasta.
>>
>> To help get rid of that, accept the driver cookie instead, while
>> keeping backwards compatibility.
>>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> 
> Thanks for your patch!
> 
>> --- a/drivers/dma/qcom/gpi.c
>> +++ b/drivers/dma/qcom/gpi.c
>> @@ -2145,7 +2151,8 @@ static struct dma_chan *gpi_of_dma_xlate(struct of_phandle_args *args,
>>         }
>>
>>         gchan->seid = seid;
>> -       gchan->protocol = args->args[2];
>> +       /* The protocol ID is in the teens range, simply ignore the higher bits */
>> +       gchan->protocol = (u32)((u64)proto);
> 
> A single cast "(uintptr_t)" should be sufficient.
> Casing the pointer to u64 on 32-bit may trigger:
> 
>     warning: cast from pointer to integer of different size
> [-Wpointer-to-int-cast]

Good point, not compiling for 32-bit always ends up biting.. thanks

Konrad

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ