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Ville Syrjälä 6bc41f9cf2 Revert "drm/i915/xe2lpd: Treat cursor plane as regular plane for DDB allocation" 
This reverts commit cfeff354f7.

A core design consideration with legacy cursor updates is that the
cursor must not touch any other plane, even if we were to force it
to take the slow path. That is the real reason why the cursor uses
a fixed ddb allocation, not because bspec says so.

Treating cursors as any other plane during ddb allocation
violates that, which means we can now pull other planes into
fully unsynced legacy cursor mailbox commits. That is
definitely not something we've ever considered when designing
the rest of the code. The noarm+arm register write split in
particular makes that dangerous as previous updates can get
disarmed pretty much at any random time, and not necessarily
in an order that is actually safe (eg. against ddb overlaps).

So if we were to do this then:
- someone needs to expend the appropriate amount of brain
  cells thinking through all the tricky details
- we should do it for all skl+ platforms since all
  of those have double buffered wm/ddb registers. The current
  arbitrary mtl+ cutoff doesn't really make sense

For the moment just go back to the original behaviour where
the cursor's ddb alloation does not change outside of
modeset/fastset. As of now anything else isn't safe.

Cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231213102519.13500-10-ville.syrjala@linux.intel.com
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
History 2024-01-22 19:05:48 +02:00
arch - Add a forgotten CPU vendor check in the AMD microcode post-loading 2023-12-10 10:53:55 -08:00
block block-6.7-2023-12-01 2023-12-02 06:39:30 +09:00
certs This update includes the following changes: 2023-11-02 16:15:30 -10:00
crypto This push fixes a regression in ahash and hides the Kconfig sub-options for the jitter RNG. 2023-11-09 17:04:58 -08:00
Documentation amd-drm-next-6.8-2024-01-05: 2024-01-09 09:07:50 +10:00
drivers Revert "drm/i915/xe2lpd: Treat cursor plane as regular plane for DDB allocation" 2024-01-22 19:05:48 +02:00
fs Char/Misc driver fixes for 6.7-rc5 2023-12-09 12:44:10 -08:00
include drm/i915: Add additional ARL PCI IDs 2024-01-18 15:24:32 -08:00
init As usual, lots of singleton and doubleton patches all over the tree and 2023-11-02 20:53:31 -10:00
io_uring io_uring/af_unix: disable sending io_uring over sockets 2023-12-07 10:35:19 -07:00
ipc Many singleton patches against the MM code. The patch series which are 2023-11-02 19:38:47 -10:00
kernel - Make sure tasks are thawed exactly and only once to avoid their state 2023-12-10 11:09:16 -08:00
lib 31 hotfixes. 10 of these address pre-6.6 issues and are marked cc:stable. 2023-12-08 08:36:23 -08:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm/madvise: add cond_resched() in madvise_cold_or_pageout_pte_range() 2023-12-06 16:12:50 -08:00
net io_uring-6.7-2023-12-08 2023-12-08 12:32:38 -08:00
rust Kbuild updates for v6.7 2023-11-04 08:07:19 -10:00
samples Landlock updates for v6.7-rc1 2023-11-03 09:28:53 -10:00
scripts 31 hotfixes. 10 of these address pre-6.6 issues and are marked cc:stable. 2023-12-08 08:36:23 -08:00
security + Features 2023-11-03 09:48:17 -10:00
sound Two fixups 2023-12-12 13:06:29 +09:00
tools Generic: 2023-12-10 10:46:46 -08:00
usr arch: Remove Itanium (IA-64) architecture 2023-09-11 08:13:17 +00:00
virt Revert "KVM: Prevent module exit until all VMs are freed" 2023-12-01 08:12:30 -08:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: rpm-pkg: generate kernel.spec in rpmbuild/SPECS/ 2023-10-03 20:49:09 +09:00
.mailmap .mailmap: add a new address mapping for Chester Lin 2023-12-06 16:12:45 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: drop Antti Palosaari 2023-12-06 16:12:49 -08:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Introduce a new DRM driver for Intel GPUs 2023-12-22 10:36:21 +10:00
Makefile Linux 6.7-rc5 2023-12-10 14:33:40 -08:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

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.