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Nysal Jan K.A f17c3a37b2 cpu/SMT: Enable SMT only if a core is online 
[ Upstream commit 6c17ea1f3e ]

If a core is offline then enabling SMT should not online CPUs of
this core. By enabling SMT, what is intended is either changing the SMT
value from "off" to "on" or setting the SMT level (threads per core) from a
lower to higher value.

On PowerPC the ppc64_cpu utility can be used, among other things, to
perform the following functions:

ppc64_cpu --cores-on                # Get the number of online cores
ppc64_cpu --cores-on=X              # Put exactly X cores online
ppc64_cpu --offline-cores=X[,Y,...] # Put specified cores offline
ppc64_cpu --smt={on|off|value}      # Enable, disable or change SMT level

If the user has decided to offline certain cores, enabling SMT should
not online CPUs in those cores. This patch fixes the issue and changes
the behaviour as described, by introducing an arch specific function
topology_is_core_online(). It is currently implemented only for PowerPC.

Fixes: 73c58e7e14 ("powerpc: Add HOTPLUG_SMT support")
Reported-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Closes: https://groups.google.com/g/powerpc-utils-devel/c/wrwVzAAnRlI/m/5KJSoqP4BAAJ
Signed-off-by: Nysal Jan K.A <nysal@linux.ibm.com>
Reviewed-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240731030126.956210-2-nysal@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-08-29 17:33:30 +02:00
..
ABI cpu/SMT: Enable SMT only if a core is online 2024-08-29 17:33:30 +02:00
accel accel/qaic: Add documentation for AIC100 accelerator driver 2023-04-06 08:23:03 +02:00
accounting docs: psi: use correct config name 2023-07-31 09:54:17 -06:00
admin-guide smb3: fix setting SecurityFlags when encryption is required 2024-08-14 13:58:59 +02:00
arch arm64: errata: Expand speculative SSBS workaround (again) 2024-08-14 13:58:49 +02:00
block Documentation work keeps chugging along; stuff for 6.6 includes: 2023-08-30 20:05:42 -07:00
bpf bpf: Replace bpf_lpm_trie_key 0-length array with flexible array 2024-08-19 06:04:27 +02:00
cdrom scsi: sr: Fix unintentional arithmetic wraparound 2024-07-25 09:50:40 +02:00
core-api workqueue: doc: Fix function and sysfs path errors 2023-10-12 07:27:22 -10:00
cpu-freq Docs/subsystem-apis: Remove '[The ]Linux' prefixes from titles of listed documents 2023-01-24 15:27:08 -07:00
crypto docs: crypto: async-tx-api: fix typo in struct name 2023-06-09 01:59:30 -06:00
dev-tools LoongArch changes for v6.6 2023-09-08 12:16:52 -07:00
devicetree dt-bindings: thermal: correct thermal zone node name limit 2024-08-03 08:54:12 +02:00
doc-guide Documentation: doc-guide: use '%' constant indicator in Return: examples 2023-07-14 13:16:59 -06:00
driver-api pwm: Rename pwm_apply_state() to pwm_apply_might_sleep() 2024-06-12 11:12:24 +02:00
fault-injection Documentation: Fix typos 2023-08-18 11:29:03 -06:00
fb Documentation: Fix typos 2023-08-18 11:29:03 -06:00
features LoongArch changes for v6.6 2023-09-08 12:16:52 -07:00
filesystems f2fs: deprecate io_bits 2024-06-12 11:12:29 +02:00
firmware-guide Documentation work keeps chugging along; stuff for 6.6 includes: 2023-08-30 20:05:42 -07:00
firmware_class firmware: revamp firmware documentation 2017-01-11 09:42:59 +01:00
fpga Documentation: use capitalization for chapters and acronyms 2023-05-16 12:49:31 -06:00
gpu drm: Allow drivers to indicate the damage helpers to ignore damage clips 2024-01-31 16:19:08 -08:00
hid HID: Add introduction about HID for non-kernel programmers 2023-08-07 13:24:36 +02:00
hwmon hwmon: corsair-psu: add USB id of HX1200i Series 2023 psu 2024-08-14 13:58:41 +02:00
i2c i2c: i801: Add support for Intel Birch Stream SoC 2023-11-28 17:19:46 +00:00
iio docs: iio: add documentation for BNO055 driver 2022-09-21 18:42:56 +01:00
images docs: add SVG version of the Linux logo 2022-06-01 09:32:45 -06:00
infiniband RDMA/core: Remove FMR device ops 2020-06-02 20:32:54 -03:00
input input: docs: pxrc: remove reference to phoenix-sim 2023-08-28 12:43:32 -06:00
isdn Documentation: isdn: correct spelling 2023-02-10 16:28:13 -08:00
kbuild kbuild: doc: Update default INSTALL_MOD_DIR from extra to updates 2024-07-05 09:33:56 +02:00
kernel-hacking Documentation: Add document for false sharing 2023-04-10 16:46:11 -06:00
leds - New Drivers 2023-07-03 11:26:05 -07:00
litmus-tests LKMM scripting updates for v6.4 2023-04-24 12:02:25 -07:00
livepatch Documentation: Fix typos 2023-08-18 11:29:03 -06:00
locking Documentation: Fix typos 2023-08-18 11:29:03 -06:00
maintainer Documentation work keeps chugging along; stuff for 6.6 includes: 2023-08-30 20:05:42 -07:00
mhi docs: Add documentation for MHI bus 2020-03-19 07:41:04 +01:00
misc-devices Documentation: Add TI TPS6594 PFSM 2023-06-15 13:41:53 +02:00
mm mm/page_table_check: support userfault wr-protect entries 2024-08-19 06:04:29 +02:00
netlabel docs: add some directories to the main documentation index 2019-07-15 11:03:03 -03:00
netlink netlink: specs: devlink: fix reply command values 2023-10-13 17:27:27 -07:00
networking net: ena: Move XDP code to its new files 2024-04-17 11:19:32 +02:00
nvdimm nvdimm: fixes to maintainter-entry-profile 2020-05-25 10:19:19 -06:00
nvme docs, nvme: add a feature and quirk policy document 2022-12-28 05:37:12 -10:00
PCI Merge branch 'pci/misc' 2023-08-29 11:03:57 -05:00
pcmcia Documentation: use capitalization for chapters and acronyms 2023-05-16 12:49:31 -06:00
peci Docs/subsystem-apis: Remove '[The ]Linux' prefixes from titles of listed documents 2023-01-24 15:27:08 -07:00
power Documentation: Fix typos 2023-08-18 11:29:03 -06:00
powerpc docs: kernel_feat.py: fix potential command injection 2024-01-31 16:18:46 -08:00
process rust: upgrade to Rust 1.73.0 2024-02-16 19:10:43 +01:00
RCU Docs/RCU/rculist_nulls: Fix text about atomic_set_release() 2023-07-14 14:55:57 -07:00
riscv docs: kernel_feat.py: fix potential command injection 2024-01-31 16:18:46 -08:00
rust docs: rust: update Rust docs output path 2023-10-19 16:39:03 +02:00
scheduler Documentation work keeps chugging along; stuff for 6.6 includes: 2023-08-30 20:05:42 -07:00
scsi SCSI misc on 20230902 2023-09-02 12:02:41 -07:00
security Documentation: Fix typos 2023-08-18 11:29:03 -06:00
sound ASoC: doc: Fix undefined SND_SOC_DAPM_NOPM argument 2024-02-05 20:14:26 +00:00
sphinx docs: kernel_include.py: Cope with docutils 0.21 2024-05-25 16:22:55 +02:00
sphinx-static docs: Add more information to the HTML sidebar 2023-02-08 13:28:27 -07:00
spi Documentation: Fix typos 2023-08-18 11:29:03 -06:00
staging Documentation: use capitalization for chapters and acronyms 2023-05-16 12:49:31 -06:00
target scsi: target: docs: Remove tcm_mod_builder.py 2023-06-28 22:01:32 -04:00
timers Documentation: use capitalization for chapters and acronyms 2023-05-16 12:49:31 -06:00
tools rtla: fix a example in rtla-timerlat-hist.rst 2023-09-22 14:44:04 +02:00
trace Documentation: probes: Add a new ret_ip callback parameter 2023-10-17 10:21:45 +09:00
translations docs: kernel_feat.py: fix potential command injection 2024-01-31 16:18:46 -08:00
usb USB / Thunderbolt / PHY driver update for 6.6-rc1 2023-09-01 09:23:34 -07:00
userspace-api media: mc: Expand MUST_CONNECT flag to always require an enabled link 2024-04-03 15:28:17 +02:00
virt ARM: 2023-09-07 13:52:20 -07:00
w1 Documentation: Fix typos 2023-08-18 11:29:03 -06:00
watchdog Documentation: Fix typos 2023-08-18 11:29:03 -06:00
wmi Documentation work keeps chugging along; stuff for 6.6 includes: 2023-08-30 20:05:42 -07:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
atomic_bitops.txt wait_on_bit: add an acquire memory barrier 2022-08-26 09:30:25 -07:00
atomic_t.txt Documentation: Fixed a typo in atomic_t.txt 2023-01-03 20:47:04 -08:00
Changes docs: add back 'Documentation/Changes' file (as symlink) 2016-12-14 16:30:12 -08:00
CodingStyle doc: re-add CodingStyle and SubmittingPatches 2016-10-24 08:12:35 -02:00
conf.py docs: Restore "smart quotes" for quotes 2024-04-03 15:28:22 +02:00
docutils.conf doc-rst: Add missing newline at end of file 2019-06-20 14:16:56 -06:00
dontdiff scripts: remove bin2c 2023-01-26 12:43:33 +09:00
index.rst docs: create a top-level arch/ directory 2023-03-23 13:27:27 -06:00
Kconfig Documentation: Avoid duplicate Kconfig inclusion 2023-01-19 13:56:34 -07:00
Makefile docs: Integrate rustdoc generation into htmldocs 2023-07-21 15:08:46 -06:00
memory-barriers.txt locking/memory-barriers.txt: Improve documentation for writel() example 2023-01-03 20:47:04 -08:00
SubmittingPatches doc: re-add CodingStyle and SubmittingPatches 2016-10-24 08:12:35 -02:00
subsystem-apis.rst docs: consolidate networking interfaces 2023-07-21 14:54:50 -06:00