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Robert Richter 48f6cec8aa cxl/port: Fix target list setup for multiple decoders sharing the same dport [ Upstream commit `3e8aaacdad` ] If a switch port has more than one decoder that is using the same downstream port, the enumeration of the target lists may fail with: # dmesg \| grep target.list update_decoder_targets: cxl decoder1.0: dport3 found in target list, index 3 update_decoder_targets: cxl decoder1.0: dport2 found in target list, index 2 update_decoder_targets: cxl decoder1.0: dport0 found in target list, index 0 update_decoder_targets: cxl decoder2.0: dport3 found in target list, index 1 update_decoder_targets: cxl decoder4.0: dport3 found in target list, index 1 cxl_mem mem6: failed to find endpoint12:0000:00:01.4 in target list of decoder2.1 cxl_mem mem8: failed to find endpoint13:0000:20:01.4 in target list of decoder4.1 The case, that the same downstream port can be used in multiple target lists, is allowed and possible. Fix the update of the target list. Enumerate all children of the switch port and do not stop the iteration after the first matching target was found. With the fix applied: # dmesg \| grep target.list update_decoder_targets: cxl decoder1.0: dport2 found in target list, index 2 update_decoder_targets: cxl decoder1.0: dport0 found in target list, index 0 update_decoder_targets: cxl decoder1.0: dport3 found in target list, index 3 update_decoder_targets: cxl decoder2.0: dport3 found in target list, index 1 update_decoder_targets: cxl decoder2.1: dport3 found in target list, index 1 update_decoder_targets: cxl decoder4.0: dport3 found in target list, index 1 update_decoder_targets: cxl decoder4.1: dport3 found in target list, index 1 Analyzing the conditions when this happens: 1) A dport is shared by multiple decoders. 2) The decoders have interleaving configured (ways > 1). The configuration above has the following hierarchy details (fixed version): root0 \|_ \| \| \| decoder0.1 \| ways: 2 \| target_list: 0,1 \|_______________________________________ \| \| \| dport0 \| dport1 \| \| port2 port4 \| \| \|___________________ \|_____________________ \| \| \| \| \| \| \| decoder2.0 decoder2.1 \| decoder4.0 decoder4.1 \| ways: 2 ways: 2 \| ways: 2 ways: 2 \| target_list: 2,3 target_list: 2,3 \| target_list: 2,3 target_list: 2,3 \|___________________ \|___________________ \| \| \| \| \| dport2 \| dport3 \| dport2 \| dport3 \| \| \| \| endpoint7 endpoint12 endpoint9 endpoint13 \|_ \|_ \|_ \|_ \| \| \| \| \| \| \| \| \| decoder7.0 \| decoder12.0 \| decoder9.0 \| decoder13.0 \| decoder7.2 \| decoder12.2 \| decoder9.2 \| decoder13.2 \| \| \| \| mem3 mem5 mem6 mem8 Note: Device numbers vary for every boot. Current kernel fails to enumerate endpoint12 and endpoint13 as the target list is not updated for the second decoder. Fixes: `4f06d81e7c` ("cxl: Defer dport allocation for switch ports") Reviewed-by: Dave Jiang <dave.jiang@intel.com> Reviewed-by: Alison Schofield <alison.schofield@intel.com> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com> Signed-off-by: Robert Richter <rrichter@amd.com> Link: https://patch.msgid.link/20260108101324.509667-1-rrichter@amd.com Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2026-01-23 11:21:15 +01:00
arch	x86/fpu: Clear XSTATE_BV[i] in guest XSAVE state whenever XFD[i]=1	2026-01-23 11:21:12 +01:00
block	block: validate pi_offset integrity limit	2026-01-17 16:35:33 +01:00
certs	sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3	2024-09-20 19:52:48 +03:00
crypto	crypto: seqiv - Do not use req->iv after crypto_aead_encrypt	2026-01-08 10:16:43 +01:00
Documentation	dt-bindings: PCI: qcom,pcie-sm8550: Add missing required power-domains and resets	2026-01-02 12:57:27 +01:00
drivers	cxl/port: Fix target list setup for multiple decoders sharing the same dport	2026-01-23 11:21:15 +01:00
fs	NFS/localio: Deal with page bases that are > PAGE_SIZE	2026-01-23 11:21:14 +01:00
include	ipv4: ip_tunnel: spread netdev_lockdep_set_classes()	2026-01-23 11:21:15 +01:00
init	printk changes for 6.18	2025-10-04 11:13:11 -07:00
io_uring	io_uring: move local task_work in exit cancel loop	2026-01-23 11:21:13 +01:00
ipc	namespace-6.18-rc1	2025-09-29 11:20:29 -07:00
kernel	trace: ftrace_dump_on_oops[] is not exported, make it static	2026-01-17 16:35:29 +01:00
lib	lib/crypto: aes: Fix missing MMU protection for AES S-box	2026-01-17 16:35:12 +01:00
LICENSES	LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2	2025-07-24 11:15:39 +02:00
mm	mm/damon/tests/core-kunit: handle alloc failures on damon_test_split_regions_of()	2026-01-08 10:17:21 +01:00
net	ipv4: ip_tunnel: spread netdev_lockdep_set_classes()	2026-01-23 11:21:15 +01:00
rust	rust: bitops: fix missing _find_* functions on 32-bit ARM	2026-01-23 11:21:12 +01:00
samples	samples/ftrace: Adjust LoongArch register restore order in direct calls	2026-01-08 10:17:11 +01:00
scripts	mcb: Add missing modpost build support	2026-01-08 10:16:47 +01:00
security	kernel/kexec: change the prototype of kimage_map_segment()	2026-01-08 10:17:10 +01:00
sound	ASoC: codecs: wsa883x: fix unnecessary initialisation	2026-01-23 11:21:13 +01:00
tools	selftests: drv-net: Bring back tool() to driver __init__s	2026-01-17 16:35:28 +01:00
usr	gen_init_cpio: Ignore fsync() returning EINVAL on pipes	2025-10-07 09:53:05 -07:00
virt	KVM: Fix last_boosted_vcpu index assignment bug	2026-01-02 12:57:21 +01:00
.clang-format	memblock: drop for_each_free_mem_pfn_range_in_zone_from()	2025-09-14 08:49:03 +03:00
.clippy.toml	rust: clean Rust 1.88.0's warning about `clippy::disallowed_macros` configuration	2025-05-07 00:11:47 +02:00
.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	MAINTAINERS: remove Alyssa Rosenzweig	2025-09-18 21:17:31 +02:00
.gitattributes	.gitattributes: set diff driver for Rust source code files	2023-05-31 17:48:25 +02:00
.gitignore	.gitignore: ignore compile_commands.json globally	2025-08-12 15:53:55 -07:00
.mailmap	8 hotfixes. 4 are cc:stable, 7 are against mm/.	2025-11-26 12:38:05 -08:00
.pylintrc	tools: docs: parse-headers.py: move it from sphinx dir	2025-08-29 15:54:42 -06:00
.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: mark ISDN subsystem as orphan	2025-10-27 17:49:45 -07:00
Kbuild	sched: Make migrate_{en,dis}able() inline	2025-09-25 09:57:16 +02:00
Kconfig	io_uring: Rename KConfig to Kconfig	2025-02-19 14:53:27 -07:00
MAINTAINERS	soc: fixes for 6.18, part 4	2025-11-28 09:57:31 -08:00
Makefile	Linux 6.18.6	2026-01-17 16:35:34 +01:00
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.