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Stephan Gerhold 5583a55e07 iommu/arm-smmu-qcom: Enable use of all SMR groups when running bare-metal 
Some platforms (e.g. SC8280XP and X1E) support more than 128 stream
matching groups. This is more than what is defined as maximum by the ARM
SMMU architecture specification. Commit 1226113473 ("iommu/arm-smmu-qcom:
Limit the SMR groups to 128") disabled use of the additional groups because
they don't exhibit the same behavior as the architecture supported ones.

It seems like this is just another quirk of the hypervisor: When running
bare-metal without the hypervisor, the additional groups appear to behave
just like all others. The boot firmware uses some of the additional groups,
so ignoring them in this situation leads to stream match conflicts whenever
we allocate a new SMR group for the same SID.

The workaround exists primarily because the bypass quirk detection fails
when using a S2CR register from the additional matching groups, so let's
perform the test with the last reliable S2CR (127) and then limit the
number of SMR groups only if we detect that we are running below the
hypervisor (because of the bypass quirk).

Fixes: 1226113473 ("iommu/arm-smmu-qcom: Limit the SMR groups to 128")
Signed-off-by: Stephan Gerhold <stephan.gerhold@linaro.org>
Signed-off-by: Will Deacon <will@kernel.org>
History 2025-11-25 16:22:27 +00:00
arch - Remove dead code leftovers after a recent mitigations cleanup which fail 2025-10-26 09:57:18 -07:00
block block-6.18-20251023 2025-10-24 12:48:19 -07:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto This push contains the following changes: 2025-10-10 08:56:16 -07:00
Documentation tty/serial driver bugfixes for 6.18-rc3 2025-10-26 10:24:39 -07:00
drivers iommu/arm-smmu-qcom: Enable use of all SMR groups when running bare-metal 2025-11-25 16:22:27 +00:00
fs - Remove dead code leftovers after a recent mitigations cleanup which fail 2025-10-26 09:57:18 -07:00
include drm-fixes for 6.18-rc3 2025-10-24 16:49:16 -07:00
init printk changes for 6.18 2025-10-04 11:13:11 -07:00
io_uring io_uring: fix buffer auto-commit for multishot uring_cmd 2025-10-23 19:41:31 -06:00
ipc namespace-6.18-rc1 2025-09-29 11:20:29 -07:00
kernel - Restore the original buslock locking in a couple of places in the irq core 2025-10-26 09:54:36 -07:00
lib lib/crypto: poly1305: Restore dependency of arch code on !KMSAN 2025-10-22 10:52:10 -07:00
LICENSES LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2 2025-07-24 11:15:39 +02:00
mm slab fixes for 6.18-rc3 2025-10-24 12:40:51 -07:00
net Including fixes from can. Slim pickings, I'm guessing people haven't 2025-10-23 07:03:18 -10:00
rust Driver core fixes for 6.18-rc3 2025-10-25 11:03:46 -07:00
samples Char/Misc/IIO/Binder changes for 6.18-rc1 2025-10-04 16:26:32 -07:00
scripts Kbuild fixes for 6.18 #1 2025-10-11 15:47:12 -07:00
security integrity-v6.18 2025-10-05 10:48:33 -07:00
sound ALSA: hda/realtek: Fix mute led for HP Omen 17-cb0xxx 2025-10-17 16:37:21 +02:00
tools - Fix x32 build due to wrong format specifier on that sub-arch 2025-10-26 09:44:36 -07:00
usr gen_init_cpio: Ignore fsync() returning EINVAL on pipes 2025-10-07 09:53:05 -07:00
virt KVM x86 fixes for 6.18: 2025-10-18 10:25:43 +02:00
.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 MAINTAINERS: Update Alex Williamson's email address 2025-10-20 15:45:03 -06:00
.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 USB/Thunderbolt changes for 6.18-rc1 2025-10-04 16:07:08 -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 io_uring-6.18-20251023 2025-10-24 12:44:31 -07:00
Makefile Linux 6.18-rc3 2025-10-26 15:59:49 -07:00
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.