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Daniel Vetter 8613385cb2 dma-fence: Document recoverable page fault implications
Recently there was a fairly long thread about recoreable hardware page
faults, how they can deadlock, and what to do about that.

While the discussion is still fresh I figured good time to try and
document the conclusions a bit. This documentation section explains
what's the potential problem, and the remedies we've discussed,
roughly ordered from best to worst.

v2: Linus -> Linux typoe (Dave)

v3:
- Make it clear drivers only need to implement one option (Christian)
- Make it clearer that implicit sync is out the window with exclusive
  fences (Christian)
- Add the fairly theoretical option of segementing the memory (either
  statically or through dynamic checks at runtime for which piece of
  memory is managed how) and explain why it's not a great idea (Felix)

References: https://lore.kernel.org/dri-devel/20210107030127.20393-1-Felix.Kuehling@amd.com/
Reviewed-by: Christian König <christian.koenig@amd.com>
Acked-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
c: Dave Airlie <airlied@gmail.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Thomas Hellström <thomas.hellstrom@intel.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: linux-media@vger.kernel.org
Cc: linaro-mm-sig@lists.linaro.org
Link: https://patchwork.freedesktop.org/patch/msgid/20210203152921.2429937-1-daniel.vetter@ffwll.ch
2021-03-12 15:10:03 +01:00
arch drm-misc-next for v5.12: 2021-01-07 10:46:32 +01:00
block SCSI fixes on 20210101 2021-01-01 12:58:07 -08:00
certs
crypto
Documentation dma-fence: Document recoverable page fault implications 2021-03-12 15:10:03 +01:00
drivers drm: panel: simple: Set enable delay for BOE NV110WTM-N61 2021-03-11 17:19:52 +01:00
fs block-5.11-2021-01-01 2021-01-01 12:49:09 -08:00
include drm/uapi: document kernel capabilities 2021-03-09 13:10:57 +01:00
init kasan, arm64: only use kasan_depth for software modes 2020-12-22 12:55:07 -08:00
ipc
kernel io_uring-5.11-2021-01-01 2021-01-01 12:29:49 -08:00
lib lib/vsprintf: Add support for printing V4L2 and DRM fourccs 2021-02-17 12:52:20 +01:00
LICENSES
mm mm: slub: call account_slab_page() after slab page initialization 2020-12-29 15:36:49 -08:00
net libceph: align session_key and con_secret to 16 bytes 2020-12-28 20:34:33 +01:00
samples
scripts lib/vsprintf: Add support for printing V4L2 and DRM fourccs 2021-02-17 12:52:20 +01:00
security Provide a fix for the incorrect handling of privilege 2020-12-24 14:08:43 -08:00
sound sound fixes for 5.11-rc1 2020-12-23 15:11:08 -08:00
tools selftests/vm: fix building protection keys test 2020-12-29 15:36:49 -08:00
usr
virt ARM: 2020-12-20 10:44:05 -08:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS drm/arc: Move to drm/tiny 2021-02-25 13:19:04 +01:00
Makefile Linux 5.11-rc2 2021-01-03 15:55:30 -08:00
README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.