kernel/linux.git/Documentation/admin-guide/perf, branch v6.19.11

Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

2025-10-07T15:59:25+00:00

Pull arm64 fixes from Will Deacon: - Preserve old 'tt_core' UAPI for Hisilicon L3C PMU driver - Ensure linear alias of kprobes instruction page is not writable - Fix kernel stack unwinding from BPF - Fix build warnings from the Fujitsu uncore PMU documentation - Fix hang with deferred 'struct page' initialisation and MTE - Consolidate KPTI page-table re-writing code * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: arm64: mte: Do not flag the zero page as PG_mte_tagged docs: perf: Fujitsu: Fix htmldocs build warnings and errors arm64: mm: Move KPTI helpers to mmu.c tracing: Fix the bug where bpf_get_stackid returns -EFAULT on the ARM64 arm64: kprobes: call set_memory_rox() for kprobe page drivers/perf: hisi: Add tt_core_deprecated for compatibility

Merge tag 'docs-6.18' of git://git.lwn.net/linux

2025-10-04T00:16:13+00:00

Pull documentation updates from Jonathan Corbet: "It has been a relatively busy cycle in docsland, with changes all over: - Bring the kernel memory-model docs into the Sphinx build in the "literal include" mode. - Lots of build-infrastructure work, further cleaning up long-term kernel-doc technical debt. The sphinx-pre-install tool has been converted to Python and updated for current systems. - A new tool to detect when documents have been moved and generate HTML redirects; this can be used on kernel.org (or any other site hosting the rendered docs) to avoid breaking links. - Automated processing of the YAML files describing the netlink protocol. - A significant update of the maintainer's PGP guide. ... and a seemingly endless series of typo fixes, build-problem fixes, etc" * tag 'docs-6.18' of git://git.lwn.net/linux: (193 commits) Documentation/features: Update feature lists for 6.17-rc7 docs: remove cdomain.py Documentation/process: submitting-patches: fix typo in "were do" docs: dev-tools/lkmm: Fix typo of missing file extension Documentation: trace: histogram: Convert ftrace docs cross-reference Documentation: trace: histogram-design: Wrap introductory note in note:: directive Documentation: trace: historgram-design: Separate sched_waking histogram section heading and the following diagram Documentation: trace: histogram-design: Trim trailing vertices in diagram explanation text Documentation: trace: histogram: Fix histogram trigger subsection number order docs: driver-api: fix spelling of "buses". Documentation: fbcon: Use admonition directives Documentation: fbcon: Reindent 8th step of attach/detach/unload Documentation: fbcon: Add boot options and attach/detach/unload section headings docs: filesystems: sysfs: add remaining top level sysfs directory descriptions docs: filesystems: sysfs: clarify symlink destinations in dev and bus/devices descriptions docs: filesystems: sysfs: remove top level sysfs net directory docs: maintainer: Fix ambiguous subheading formatting docs: kdoc: a few more dump_typedef() tweaks docs: kdoc: remove redundant comment stripping in dump_typedef() docs: kdoc: remove some dead code in dump_typedef() ...

docs: perf: Fujitsu: Fix htmldocs build warnings and errors

2025-09-26T13:34:35+00:00

Running "make htmldocs" generates the following build errors and warnings for fujitsu_uncore_pmu.rst: Documentation/admin-guide/perf/fujitsu_uncore_pmu.rst:20: ERROR: Unexpected indentation. Documentation/admin-guide/perf/fujitsu_uncore_pmu.rst:23: WARNING: Block quote ends without a blank line; unexpected unindent. Documentation/admin-guide/perf/fujitsu_uncore_pmu.rst:28: ERROR: Unexpected indentation. Documentation/admin-guide/perf/fujitsu_uncore_pmu.rst:29: WARNING: Block quote ends without a blank line; unexpected unindent. Documentation/admin-guide/perf/fujitsu_uncore_pmu.rst:81: ERROR: Unexpected indentation. Documentation/admin-guide/perf/fujitsu_uncore_pmu.rst:82: WARNING: Block quote ends without a blank line; unexpected unindent. Add blank line before bullet lists, block quotes to fix build errors, resolve warnings and properly render perf commands as code blocks. Signed-off-by: Gopi Krishna Menon Reviewed-by: Koichi Okuno Fixes: bad11557eed2 ("perf: Fujitsu: Add the Uncore PMU driver") Reviewed-by: Bagas Sanjaya Reviewed-by: Randy Dunlap Tested-by: Randy Dunlap Signed-off-by: Will Deacon

drivers/perf: hisi: Add tt_core_deprecated for compatibility

2025-09-25T12:51:59+00:00

Previously tt_core is defined as config1:0-7 which may not cover all the CPUs sharing L3C on platforms with more than 8 CPUs in a L3C. In order to support such platforms extend tt_core to 16 bits, since no spare space in config1, tt_core was moved to config2:0-15. Though linux expects the users to retrieve the control encoding from sysfs first for each option, it's possible if user doesn't follow this and hardcoded tt_core in config1. So add an option tt_core_deprecated for config1:0-7 for backward compatibility. Signed-off-by: Yicong Yang Signed-off-by: Will Deacon

Documentation: hisi-pmu: Add introduction to HiSilicon V3 PMU

2025-09-22T12:14:38+00:00

Some of HiSilicon V3 PMU hardware is divided into parts to fulfill the job of monitoring specific parts of a device. Add description on that as well as the newly added ext option for L3C PMU. Acked-by: Jonathan Cameron Signed-off-by: Yushan Wang Reviewed-by: Yicong Yang Signed-off-by: Will Deacon

Documentation: hisi-pmu: Fix of minor format error

2025-09-22T12:14:38+00:00

The inline path of sysfs should be placed in literal blocks to make documentation look better. Acked-by: Jonathan Cameron Acked-by: Yicong Yang Signed-off-by: Yushan Wang Signed-off-by: Will Deacon

perf: Fujitsu: Add the Uncore PMU driver

2025-09-22T12:05:11+00:00

This adds a new dynamic PMU to the Perf Events framework to program and control the Uncore PMUs in Fujitsu chips. This driver exports formatting and event information to sysfs so it can be used by the perf user space tools with the syntaxes: perf stat -e pci_iod0_pci0/ea-pci/ ls perf stat -e pci_iod0_pci0/event=0x80/ ls perf stat -e mac_iod0_mac0_ch0/ea-mac/ ls perf stat -e mac_iod0_mac0_ch0/event=0x80/ ls FUJITSU-MONAKA PMU Events Specification v1.1 URL: https://github.com/fujitsu/FUJITSU-MONAKA Reviewed-by: Yicong Yang Signed-off-by: Koichi Okuno Signed-off-by: Will Deacon

drivers/perf: hisi: Add support for HiSilicon NoC PMU

2025-09-18T13:54:29+00:00

Adds the support for HiSilicon NoC (Network on Chip) PMU which will be used to monitor the events on the system bus. The PMU device will be named after the SCL ID (either Super CPU cluster or Super IO cluster) and the index ID, just similar to other HiSilicon Uncore PMUs. Below PMU formats are provided besides the event: - ch: the transaction channel (data, request, response, etc) which can be used to filter the counting. - tt_en: tracetag filtering enable. Just as other HiSilicon Uncore PMUs the NoC PMU supports only counting the transactions with tracetag. The NoC PMU doesn't have an interrupt to indicate the overflow. However we have a 64 bit counter which is large enough and it's nearly impossible to overflow. Reviewed-by: Jonathan Cameron Signed-off-by: Yicong Yang Signed-off-by: Will Deacon

perf/dwc_pcie: Support counting multiple lane events in parallel

2025-09-18T12:52:13+00:00

While Designware PCIe PMU allows to count only one time based event at a time, it allows to count all the lane events simultaneously. After the patch one is able to count a group of lane events: $ perf stat -e '{dwc_rootport/tx_memory_write,lane=1/,dwc_rootport/rx_memory_read,lane=0/}' dd if=/dev/nvme0n1 of=/dev/null bs=1M count=1 Earlier the events wouldn't have been counted successfully. Signed-off-by: Ilkka Koskinen Signed-off-by: Will Deacon

Documentation: Fix admin-guide typos

2025-08-18T16:31:19+00:00

Fix typos. Signed-off-by: Bjorn Helgaas Reviewed-by: Randy Dunlap Signed-off-by: Jonathan Corbet Link: https://lore.kernel.org/r/20250813200526.290420-4-helgaas@kernel.org