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] [thread-next>] [day] [month] [year] [list]
Date:   Tue, 29 Mar 2022 23:16:51 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Manivannan Sadhasivam <mani@...nel.org>,
        Srini Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Yann Gautier <yann.gautier@...s.st.com>, ulf.hansson@...aro.org,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mmc@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Christophe Kerello <christophe.kerello@...s.st.com>,
        Ludovic Barre <ludovic.barre@...s.st.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Russell King <linux@...linux.org.uk>,
        Marek Vasut <marex@...x.de>, kernel@...electronics.com,
        Grzegorz Szymaszek <gszymaszek@...rt.pl>
Subject: Re: [PATCH 1/3] dt-bindings: mmc: mmci: add a property to disable DMA LLI

On Tue, Mar 29, 2022 at 7:33 PM Manivannan Sadhasivam <mani@...nel.org> wrote:
> [Yann]
> > As for Prabhakar's answer, the IDMA here is inside our IP, and not used in
> > any other IP. So I'm not sure it is really relevant to move that to another
> > dmaengine driver.
>
> Okay, I think this justification makes sense. I was worried of DMA IPs that get
> sandwiched into many peripherals like the one on Renesas platforms. It turned
> out that each subsystem has to add internal DMA support for it :/

That is a justified worry.

Qualcomm has "BAM DMA" (I think it is called?) which is added to each IP
that needs DMA. drivers/mmc/host/mmci_qcom_dml.c
It's for older Qualcomm platforms but I *think* it is actually not just used
for the MMCI, just noone ever got around to adding it to any other
peripheral? Srini do you know?

Yours,
Linus Walleij

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ