From: Dmitry Osipenko <digetx@gmail.com>
To: Thierry Reding <thierry.reding@gmail.com>
Cc: linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
Jonathan Hunter <jonathanh@nvidia.com>,
linux-tegra@vger.kernel.org, Will Deacon <will@kernel.org>
Subject: Re: [PATCH v1 1/2] iommu/tegra-smmu: Defer attachment of display clients
Date: Fri, 9 Apr 2021 15:55:41 +0300 [thread overview]
Message-ID: <7c1ebbf2-5d27-fa2a-3cae-bedab4c8e30a@gmail.com> (raw)
In-Reply-To: <c4b42a3d-d260-9a69-4ee7-8ad586741f8c@gmail.com>
08.04.2021 17:07, Dmitry Osipenko пишет:
>> Whatever happened to the idea of creating identity mappings based on the
>> obscure tegra_fb_mem (or whatever it was called) command-line option? Is
>> that command-line not universally passed to the kernel from bootloaders
>> that initialize display?
> This is still a good idea! The command-line isn't universally passed
> just because it's up to a user to override the cmdline and then we get a
> hang (a very slow boot in reality) on T30 since display client takes out
> the whole memory bus with the constant SMMU faults. For example I don't
> have that cmdline option in my current setups.
>
Thinking a bit more about the identity.. have you consulted with the
memory h/w people about whether it's always safe to enable ASID in a
middle of DMA request?
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
prev parent reply other threads:[~2021-04-09 12:55 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-28 23:32 [PATCH v1 1/2] iommu/tegra-smmu: Defer attachment of display clients Dmitry Osipenko
2021-03-28 23:32 ` [PATCH v1 2/2] iommu/tegra-smmu: Revert workaround that was needed for Nyan Big Chromebook Dmitry Osipenko
2021-04-01 8:55 ` Nicolin Chen
2021-04-02 14:40 ` Dmitry Osipenko
2021-04-23 15:01 ` Guillaume Tucker
2021-04-23 15:23 ` Dmitry Osipenko
2021-04-24 20:27 ` Dmitry Osipenko
2021-04-24 20:41 ` Dmitry Osipenko
2021-04-26 7:14 ` Thierry Reding
2021-04-26 7:39 ` Dmitry Osipenko
2021-04-08 9:42 ` [PATCH v1 1/2] iommu/tegra-smmu: Defer attachment of display clients Nicolin Chen
2021-04-08 13:26 ` Thierry Reding
2021-04-08 14:20 ` Dmitry Osipenko
2021-04-08 12:40 ` Thierry Reding
2021-04-08 14:07 ` Dmitry Osipenko
2021-04-09 12:55 ` Dmitry Osipenko [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=7c1ebbf2-5d27-fa2a-3cae-bedab4c8e30a@gmail.com \
--to=digetx@gmail.com \
--cc=iommu@lists.linux-foundation.org \
--cc=jonathanh@nvidia.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-tegra@vger.kernel.org \
--cc=thierry.reding@gmail.com \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox