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Smita Koralahalli 406ca74ade cxl/core/regs.c: Skip Memory Space Enable check for RCD and RCH Ports 
commit 078d3ee7c1 upstream.

According to CXL r3.2 section 8.2.1.2, the PCI_COMMAND register fields,
including Memory Space Enable bit, have no effect on the behavior of an
RCD Upstream Port. Retaining this check may incorrectly cause
cxl_pci_probe() to fail on a valid RCD upstream Port.

While the specification is explicit only for RCD Upstream Ports, this
check is solely for accessing the RCRB, which is always mapped through
memory space. Therefore, its safe to remove the check entirely. In
practice, firmware reliably enables the Memory Space Enable bit for
RCH Downstream Ports and no failures have been observed.

Removing the check simplifies the code and avoids unnecessary
special-casing, while relying on BIOS/firmware to configure devices
correctly. Moreover, any failures due to inaccessible RCRB regions
will still be caught either in __rcrb_to_component() or while
parsing the component register block.

The following failure was observed in dmesg when the check was present:
	cxl_pci 0000:7f:00.0: No component registers (-6)

Fixes: d5b1a27143 ("cxl/acpi: Extract component registers of restricted hosts from RCRB")
Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>
Cc: <stable@vger.kernel.org>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Robert Richter <rrichter@amd.com>
Link: https://patch.msgid.link/20250407192734.70631-1-Smita.KoralahalliChannabasappa@amd.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-05-02 07:50:47 +02:00
arch KVM: SVM: Allocate IR data using atomic allocation 2025-05-02 07:50:47 +02:00
block block: fix resource leak in blk_register_queue() error path 2025-04-25 10:45:42 +02:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2025-04-25 10:45:58 +02:00
crypto crypto: ecc - Prevent ecc_digits_from_bytes from reading too many bytes 2025-01-09 13:31:52 +01:00
Documentation sched/topology: Consolidate and clean up access to a CPU's max compute capacity 2025-05-02 07:50:41 +02:00
drivers cxl/core/regs.c: Skip Memory Space Enable check for RCD and RCH Ports 2025-05-02 07:50:47 +02:00
fs splice: remove duplicate noinline from pipe_clear_nowait 2025-05-02 07:50:45 +02:00
include sched/cpufreq: Rework schedutil governor performance estimation 2025-05-02 07:50:41 +02:00
init rust: Disallow BTF generation with Rust + LTO 2025-03-22 12:50:48 -07:00
io_uring io_uring: fix 'sync' handling of io_fallback_tw() 2025-05-02 07:50:47 +02:00
ipc ipc: fix memleak if msg_init_ns failed in create_ipc_ns 2024-12-09 10:32:54 +01:00
kernel dma/contiguous: avoid warning about unused size_bytes 2025-05-02 07:50:42 +02:00
lib string: Add load_unaligned_zeropad() code path to sized_strscpy() 2025-04-25 10:45:50 +02:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm: fix apply_to_existing_page_range() 2025-04-25 10:45:48 +02:00
net net: selftests: initialize TCP header and skb payload with zero 2025-05-02 07:50:46 +02:00
rust rust: lockdep: Remove support for dynamically allocated LockClassKeys 2025-03-22 12:50:50 -07:00
samples tracing: Verify event formats that have "%*p.." 2025-05-02 07:50:37 +02:00
scripts sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2025-04-25 10:45:58 +02:00
security landlock: Add the errata interface 2025-04-25 10:45:57 +02:00
sound ASoC: q6apm-dai: make use of q6apm_get_hw_pointer 2025-05-02 07:50:39 +02:00
tools landlock: Add the errata interface 2025-04-25 10:45:57 +02:00
usr kbuild: hdrcheck: fix cross build with clang 2025-03-13 12:58:38 +01:00
virt KVM: Use dedicated mutex to protect kvm_usage_count to avoid deadlock 2024-10-04 16:29:47 +02:00
.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 Remove *.orig pattern from .gitignore 2024-10-04 16:29:44 +02:00
.mailmap 20 hotfixes. 12 are cc:stable and the remainder address post-6.5 issues 2023-10-24 09:52:16 -10:00
.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 USB: Remove Wireless USB and UWB documentation 2023-08-09 14:17:32 +02:00
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 sign-file,extract-cert: move common SSL helper functions to a header 2025-04-25 10:45:57 +02:00
Makefile Linux 6.6.88 2025-04-25 10:45:59 +02:00
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.