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Alyssa Rosenzweig f18492faa9 lima,panfrost: Do not ralloc contexts against the screen
ralloc is not thread-safe. While a given context can only be accessed from a
single thread at once, multiple contexts can be created against the same screen
at once. The ralloc allocations against the shared screens will race. Depending
on the result of the race, the same block of memory can be returned as the two
new contexts in two different threads, causing a use-after-free when the context
is freed later.

We free the context explicitly when it's destroyed anyway. If screens are
getting destroyed without the contexts getting destroyed first, that's a state
tracker bug, not a Panfrost one.

This matches what Iris does.

Fixes crash in test_integer_ops.int_math on Panfrost.

Fixes: 0fcf73bc2d ("panfrost: Move to use ralloc for some allocations")
Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17234>
2022-06-27 21:21:00 +00:00
.github/workflows Init macOS GitHub Action 2022-06-09 09:24:52 +00:00
.gitlab/issue_templates gitlab: ask that reporters don't include long logs in descriptions 2022-06-08 15:06:51 +00:00
.gitlab-ci ci/dzn: Copy testlog.{css,xsl} to the result dir 2022-06-24 18:15:16 +00:00
android Android.mk: Intermediate output paths may already be absolute 2022-06-26 22:06:36 +00:00
bin bin: Add a script for filtering/sorting refcount logs 2022-05-02 16:58:20 +00:00
build-support configure: commit test files 2017-10-16 16:32:43 -07:00
docs v3dv: Implement VK_KHR_performance_query 2022-06-27 07:34:16 +00:00
include c11: Move the implementation of threads.h into c source code 2022-06-15 17:37:17 +00:00
src lima,panfrost: Do not ralloc contexts against the screen 2022-06-27 21:21:00 +00:00
subprojects meson: Update libelf wrap for Windows 2021-11-12 09:46:10 +00:00
.dir-locals.el dir-locals.el: Adds White Space support 2016-11-14 19:17:49 +02:00
.editorconfig ci/vs2019: Update editorconfig for ps1 files 2022-06-14 21:14:33 +00:00
.gitattributes Add new rules to .gitattributes 2022-01-19 15:17:17 +00:00
.gitignore .gitignore: Qualify the path for the ignored build directory. 2022-06-09 22:53:37 +00:00
.gitlab-ci.yml ci: Revert "CI: Lima farm is offline" 2022-06-27 07:02:30 +00:00
.mailmap .mailmap: Switch Jason Ekstrand to @collabora.com 2022-01-26 20:08:31 +00:00
CODEOWNERS CODEOWNERS: evelikov renamed to xexaxo 2022-06-24 12:28:59 +00:00
meson.build meson: Define _GNU_SOURCE for android host system 2022-06-22 11:52:36 +03:00
meson_options.txt meson: Add build option for gallium-d3d12-video feature 2022-05-24 16:36:31 +00:00
README.rst docs: promote #dri-devel on oftc over freenode 2021-05-24 09:21:48 +00:00
VERSION VERSION: bump to 22.2-devel for next cycle 2022-04-13 23:40:25 +00:00

`Mesa <https://mesa3d.org>`_ - The 3D Graphics Library
======================================================


Source
------

This repository lives at https://gitlab.freedesktop.org/mesa/mesa.
Other repositories are likely forks, and code found there is not supported.


Build & install
---------------

You can find more information in our documentation (`docs/install.rst
<https://mesa3d.org/install.html>`_), but the recommended way is to use
Meson (`docs/meson.rst <https://mesa3d.org/meson.html>`_):

.. code-block:: sh

  $ mkdir build
  $ cd build
  $ meson ..
  $ sudo ninja install


Support
-------

Many Mesa devs hang on IRC; if you're not sure which channel is
appropriate, you should ask your question on `OFTC's #dri-devel
<irc://irc.oftc.net/dri-devel>`_, someone will redirect you if
necessary.
Remember that not everyone is in the same timezone as you, so it might
take a while before someone qualified sees your question.
To figure out who you're talking to, or which nick to ping for your
question, check out `Who's Who on IRC
<https://dri.freedesktop.org/wiki/WhosWho/>`_.

The next best option is to ask your question in an email to the
mailing lists: `mesa-dev\@lists.freedesktop.org
<https://lists.freedesktop.org/mailman/listinfo/mesa-dev>`_


Bug reports
-----------

If you think something isn't working properly, please file a bug report
(`docs/bugs.rst <https://mesa3d.org/bugs.html>`_).


Contributing
------------

Contributions are welcome, and step-by-step instructions can be found in our
documentation (`docs/submittingpatches.rst
<https://mesa3d.org/submittingpatches.html>`_).

Note that Mesa uses gitlab for patches submission, review and discussions.