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Vitaly Prosyak d9db9abf66 drm/amdgpu: disable peer-to-peer access for DCC-enabled GC12 VRAM surfaces commit `22a36e660d` upstream. Certain multi-GPU configurations (especially GFX12) may hit data corruption when a DCC-compressed VRAM surface is shared across GPUs using peer-to-peer (P2P) DMA transfers. Such surfaces rely on device-local metadata and cannot be safely accessed through a remote GPU’s page tables. Attempting to import a DCC-enabled surface through P2P leads to incorrect rendering or GPU faults. This change disables P2P for DCC-enabled VRAM buffers that are contiguous and allocated on GFX12+ hardware. In these cases, the importer falls back to the standard system-memory path, avoiding invalid access to compressed surfaces. Future work could consider optional migration (VRAM→System→VRAM) if a performance regression is observed when `attach->peer2peer = false`. Tested on: - Dual RX 9700 XT (Navi4x) setup - GNOME and Wayland compositor scenarios - Confirmed no corruption after disabling P2P under these conditions v2: Remove check TTM_PL_VRAM & TTM_PL_FLAG_CONTIGUOUS. v3: simplify for upsteam and fix ip version check (Alex) Suggested-by: Christian König <christian.koenig@amd.com> Signed-off-by: Vitaly Prosyak <vitaly.prosyak@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> (cherry picked from commit `9dff2bb709`) Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2025-11-24 10:36:03 +01:00
arch	LoongArch: Use physical addresses for CSR_MERRENTRY/CSR_TLBRENTRY	2025-11-24 10:36:02 +01:00
block	blk-cgroup: fix possible deadlock while configuring policy	2025-11-13 15:34:07 -05:00
certs	sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3	2024-09-20 19:52:48 +03:00
crypto	crypto: essiv - Check ssize for decryption and in-place encryption	2025-10-19 16:33:42 +02:00
Documentation	dpll: spec: add missing module-name and clock-id to pin-get reply	2025-11-13 15:33:59 -05:00
drivers	drm/amdgpu: disable peer-to-peer access for DCC-enabled GC12 VRAM surfaces	2025-11-24 10:36:03 +01:00
fs	btrfs: release root after error in data_reloc_print_warning_inode()	2025-11-24 10:36:03 +01:00
include	dma-mapping: benchmark: Restore padding to ensure uABI remained consistent	2025-11-24 10:35:59 +01:00
init	init: handle bootloader identifier in kernel parameters	2025-10-19 16:33:50 +02:00
io_uring	io_uring/zctx: check chained notif contexts	2025-11-13 15:34:03 -05:00
ipc	ipc: fix to protect IPCS lookups using RCU	2025-06-27 11:11:22 +01:00
kernel	PM: hibernate: Use atomic64_t for compressed_size variable	2025-11-24 10:36:03 +01:00
lib	lib/crypto: curve25519-hacl64: Fix older clang KASAN workaround for GCC	2025-11-13 15:34:40 -05:00
LICENSES	LICENSES: add 0BSD license text	2024-09-01 20:43:24 -07:00
mm	codetag: debug: handle existing CODETAG_EMPTY in mark_objexts_empty for slabobj_ext	2025-11-24 10:36:01 +01:00
net	wifi: mac80211: reject address change while connecting	2025-11-24 10:36:00 +01:00
rust	rust: Add -fno-isolate-erroneous-paths-dereference to bindgen_skip_c_flags	2025-11-24 10:35:49 +01:00
samples	ftrace/samples: Fix function size computation	2025-09-19 16:35:44 +02:00
scripts	gcc-plugins: Remove TODO_verify_il for GCC >= 16	2025-10-06 11:17:52 +02:00
security	ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr	2025-11-13 15:34:32 -05:00
sound	ALSA: usb-audio: Fix potential overflow of PCM transfer buffer	2025-11-24 10:36:01 +01:00
tools	selftests/user_events: fix type cast for write_index packed member in perf_test	2025-11-24 10:36:02 +01:00
usr	kbuild: uapi: Strip comments before size type check	2025-11-13 15:34:35 -05:00
virt	KVM: Allow CPU to reschedule while setting per-page memory attributes	2025-07-17 18:37:08 +02:00
.clang-format	clang-format: Update with v6.11-rc1's `for_each` macro list	2024-08-02 13:20:31 +02:00
.clippy.toml	rust: give Clippy the minimum supported Rust version	2025-08-01 09:48:44 +01:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.editorconfig	.editorconfig: remove trim_trailing_whitespace option	2024-06-13 16:47:52 +02:00
.get_maintainer.ignore	Add Jeff Kirsher to .get_maintainer.ignore	2024-03-08 11:36:54 +00:00
.gitattributes	.gitattributes: set diff driver for Rust source code files	2023-05-31 17:48:25 +02:00
.gitignore	rust: introduce `.clippy.toml`	2025-03-13 13:01:42 +01:00
.mailmap	mailmap: add entry for Thorsten Blum	2024-11-07 14:14:59 -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: Remove self from DSA entry	2024-11-03 12:52:38 -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	MAINTAINERS: Update Alexey Makhalov's email address	2025-05-22 14:29:46 +02:00
Makefile	Linux 6.12.58	2025-11-13 15:34:41 -05:00
README	README: Fix spelling	2024-03-18 03:36:32 -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 reStructuredText 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.