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Brian Vazquez 5a7ba7e66b idpf: reduce mbx_task schedule delay to 300us 
[ Upstream commit b3d6bbae1d ]

During the IDPF init phase, the mailbox runs in poll mode until it is
configured to properly handle interrupts. The previous delay of 300ms is
excessively long for the mailbox polling mechanism, which causes a slow
initialization of ~2s:

echo 0000:06:12.4 > /sys/bus/pci/drivers/idpf/bind

[   52.444239] idpf 0000:06:12.4: enabling device (0000 -> 0002)
[   52.485005] idpf 0000:06:12.4: Device HW Reset initiated
[   54.177181] idpf 0000:06:12.4: PTP init failed, err=-EOPNOTSUPP
[   54.206177] idpf 0000:06:12.4: Minimum RX descriptor support not provided, using the default
[   54.206182] idpf 0000:06:12.4: Minimum TX descriptor support not provided, using the default

Changing the delay to 300us avoids the delays during the initial mailbox
transactions, making the init phase much faster:

[   83.342590] idpf 0000:06:12.4: enabling device (0000 -> 0002)
[   83.384402] idpf 0000:06:12.4: Device HW Reset initiated
[   83.518323] idpf 0000:06:12.4: PTP init failed, err=-EOPNOTSUPP
[   83.547430] idpf 0000:06:12.4: Minimum RX descriptor support not provided, using the default
[   83.547435] idpf 0000:06:12.4: Minimum TX descriptor support not provided, using the default

Fixes: 4930fbf419 ("idpf: add core init and interrupt request")
Signed-off-by: Brian Vazquez <brianvv@google.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Tested-by: Samuel Salin <Samuel.salin@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-01-08 10:16:43 +01:00
arch KVM: s390: Fix gmap_helper_zap_one_page() again 2026-01-08 10:16:41 +01:00
block block: freeze queue when updating zone resources 2026-01-02 12:57:31 +01:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: af_alg - zero initialize memory allocated via sock_kmalloc 2026-01-02 12:57:27 +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 idpf: reduce mbx_task schedule delay to 300us 2026-01-08 10:16:43 +01:00
fs fuse: missing copy_finish in fuse-over-io-uring argument copies 2026-01-02 12:57:31 +01:00
include drm/edid: add DRM_EDID_IDENT_INIT() to initialize struct drm_edid_ident 2026-01-08 10:16:42 +01:00
init printk changes for 6.18 2025-10-04 11:13:11 -07:00
io_uring io_uring/rsrc: fix lost entries after cloned range 2026-01-02 12:57:30 +01:00
ipc namespace-6.18-rc1 2025-09-29 11:20:29 -07:00
kernel sched_ext: fix uninitialized ret on alloc_percpu() failure 2026-01-08 10:16:43 +01:00
lib lib/crypto: riscv: Depend on RISCV_EFFICIENT_VECTOR_UNALIGNED_ACCESS 2026-01-02 12:57:29 +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/huge_memory: merge uniform_split_supported() and non_uniform_split_supported() 2026-01-08 10:16:41 +01:00
net wifi: mac80211: do not use old MBSSID elements 2026-01-08 10:16:42 +01:00
rust rust: io: add typedef for phys_addr_t 2026-01-02 12:57:05 +01:00
samples samples: rust: fix endianness issue in rust_driver_pci 2026-01-02 12:57:05 +01:00
scripts kbuild: Use objtree for module signing key path 2026-01-02 12:56:40 +01:00
security tpm2-sessions: Fix out of range indexing in name_size 2026-01-02 12:57:11 +01:00
sound ASoC: SOF: ipc4-topology: Convert FLOAT to S32 during blob selection 2026-01-02 12:57:24 +01:00
tools rtla/timerlat_bpf: Stop tracing on user latency 2026-01-02 12:57:29 +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 6.18.3 2026-01-02 12:57:31 +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.