kunit:
- Fixes rust warnings when CONFIG_PRINTK is disabled.
- Reduces stack usage in kunit_run_tests() to fix warnings when
CONFIG_FRAME_WARN is set to a relatively low value.
- Updates email address for David Gow.
kunit tool:
- Copies caller args in run_kernel to prevent mutation.
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Merge tag 'linux_kselftest-kunit-fixes-7.0-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest
Pull kunit fixes from Shuah Khan:
- Fix rust warnings when CONFIG_PRINTK is disabled
- Reduce stack usage in kunit_run_tests() to fix warnings when
CONFIG_FRAME_WARN is set to a relatively low value
- Update email address for David Gow
- Copy caller args in kunit tool in run_kernel to prevent mutation
* tag 'linux_kselftest-kunit-fixes-7.0-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest:
kunit: reduce stack usage in kunit_run_tests()
kunit: tool: copy caller args in run_kernel to prevent mutation
rust: kunit: fix warning when !CONFIG_PRINTK
MAINTAINERS: Update email address for David Gow
-Wflex-array-member-not-at-end was introduced in GCC-14, and we are
getting ready to enable it, globally.
Remove unused structures bss_bias_info and bss_bias, and member
bss in struct roam_ctrl_cmd.
After these changes, the size of struct roam_ctrl_cmd, along
with its member's offsets remain the same, hence the memory layout
doesn't change:
Before changes:
struct roam_ctrl_cmd {
union {
u8 bssid[6]; /* 0 6 */
u8 roam_mode; /* 0 1 */
struct bss_bias_info bss; /* 0 1 */
struct low_rssi_scan_params params; /* 0 8 */
} info; /* 0 8 */
u8 roam_ctrl; /* 8 1 */
/* size: 9, cachelines: 1, members: 2 */
/* last cacheline: 9 bytes */
} __attribute__((__packed__));
After changes:
struct roam_ctrl_cmd {
union {
u8 bssid[6]; /* 0 6 */
u8 roam_mode; /* 0 1 */
struct low_rssi_scan_params params; /* 0 8 */
} info; /* 0 8 */
u8 roam_ctrl; /* 8 1 */
/* size: 9, cachelines: 1, members: 2 */
/* last cacheline: 9 bytes */
} __attribute__((__packed__));
With these changes fix the following warning:
drivers/net/wireless/ath/ath6kl/wmi.h:1658:20: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://patch.msgid.link/aZ0tGZnmtGckKJzY@kspp
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
The current implementation incorrectly reports legacy CCK and OFDM rates
in monitor mode radiotap headers. The rate field displays wrong values,
for example showing 11 Mbps when the actual rate is 1 Mbps. This occurs
because the HAL layer uses a unified enum for both CCK and OFDM rates
without distinguishing between long/short preamble variants and proper
rate mapping to hardware rate indices.
The root cause is threefold:
1. The hal_rx_legacy_rate enum conflates CCK and OFDM rates into a
single enumeration, making it impossible to differentiate between
802.11b CCK rates (with long/short preamble variants) and 802.11a/g
OFDM rates.
2. The L-SIG-B parsing function maps hardware rate values to the wrong
enum values. For CCK rates, it incorrectly combines long and short
preamble cases (e.g., cases 2 and 5 both map to 2 Mbps), losing
preamble information critical for proper rate identification.
3. The mac layer's rate-to-index conversion function does not properly
handle the precedence between long preamble, short preamble, and
OFDM rates when matching hardware rate values.
Split the hal_rx_legacy_rate enum into two separate enumerations:
hal_rx_legacy_rate for CCK rates with explicit long preamble (LP) and
short preamble (SP) variants, and hal_rx_legacy_rates_ofdm for OFDM
rates. This separation allows proper identification of rate types and
preamble modes.
Introduce a new mapping ath12k_wifi7_hal_mon_map_legacy_rate_to_hw_rate()
that converts HAL CCK rate enums to hardware rate indices defined in
ath12k_hw_rate_cck. This ensures the rate field in ppdu_info contains
the correct hardware rate index that matches the mac layer's expectations.
Update the L-SIG-B parsing to map each hardware rate value (1-7) to its
corresponding CCK rate enum with proper preamble designation:
- Cases 1-4: Long preamble (1, 2, 5.5, 11 Mbps)
- Cases 5-7: Short preamble (2, 5.5, 11 Mbps)
Update the L-SIG-A parsing to use the new OFDM-specific enum values,
maintaining the existing rate mapping for 802.11a/g OFDM rates.
Refactor the mac layer's ath12k_mac_hw_rate_to_idx() function to
implement proper matching precedence:
1. First match OFDM rates using the IEEE80211_RATE_MANDATORY_A flag
2. Then match CCK short preamble rates
3. Finally match CCK long preamble rates as fallback
Add helper macros ATH12K_MAC_RATE_A_M and ATH12K_MAC_RATE_B to improve
readability of the rate table initialization and ensure the mandatory
flag is set for OFDM rates.
This fix ensures monitor mode captures display accurate rate information
in the radiotap header, correctly distinguishing between 1 Mbps and
11 Mbps, and properly identifying preamble types for CCK rates.
Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.6-01181-QCAHKSWPL_SILICONZ-1
Fixes: d889913205 ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices")
Signed-off-by: P Praneesh <praneesh.p@oss.qualcomm.com>
Signed-off-by: Thiraviyam Mariyappan <thiraviyam.mariyappan@oss.qualcomm.com>
Reviewed-by: Baochen Qiang <baochen.qiang@oss.qualcomm.com>
Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Link: https://patch.msgid.link/20260209054924.2713072-1-thiraviyam.mariyappan@oss.qualcomm.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
Per-link logical index is assigned from the global counter,
ahsta->num_peer. This logical index is sent to firmware during peer
association. If there is a failure in creating a link station,
ath12k_mac_free_unassign_link_sta() clears the link, but does not decrement
the logical link index. This will result in a higher logical link index for
the next link station created. Also, if there is a leak in logical link
index as we assign the incremented num_peer, then the index can exceed the
maximum valid value of 15.
As an example, let's say we have a 2 GHz + 5 GHz + 6 GHz MLO setup. So the
logical link indices that they have are 0, 1 and 2, respectively. If the
5 GHz link is removed, logical link index 1 becomes available, and num_peer
is not reduced to 2 and still remains at 3. If a new 5 GHz link is added
later, it gets the index 3, instead of reusing link index 1. Also,
num_peer is increased to 4, though only 3 links are present.
To resolve these, create a bitmap, free_logical_link_idx, that tracks the
available logical link indices. When a link station is created, select the
first free logical index and when a link station is removed, mark its
logical link index as available by setting the bit.
Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.6-01181-QCAHKSWPL_SILICONZ-1
Signed-off-by: Manish Dharanenthiran <manish.dharanenthiran@oss.qualcomm.com>
Signed-off-by: Roopni Devanathan <roopni.devanathan@oss.qualcomm.com>
Reviewed-by: Rameshkumar Sundaram <rameshkumar.sundaram@oss.qualcomm.com>
Reviewed-by: Baochen Qiang <baochen.qiang@oss.qualcomm.com>
Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Link: https://patch.msgid.link/20260226041911.2434999-1-roopni.devanathan@oss.qualcomm.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
The fields tx_retry_failed, tx_retry_count, and tx_duration are
currently updated outside the HTT_PPDU_STATS_TAG_USR_COMPLTN_ACK_BA_STATUS
flag check. In certain scenarios, firmware delivers multiple PPDU
statistics for the same PPDU, first without BA/ACK information, and
later with BA/ACK status once it becomes available. As the same PPDU
is processed again, these counters are updated a second time,
resulting in duplicate TX statistics.
To address this, move the accounting of tx_retry_failed and
tx_retry_count under the ACK/BA status flag check, and similarly gate
tx_duration on the same path. This ensures that each PPDU contributes
to these counters exactly once, avoids double counting, and provides
consistent reporting in userspace tools such as station dump.
Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.6-01243-QCAHKSWPL_SILICONZ-1
Fixes: a0b963e1da ("wifi: ath12k: fetch tx_retry and tx_failed from htt_ppdu_stats_user_cmpltn_common_tlv")
Signed-off-by: Sarika Sharma <sarika.sharma@oss.qualcomm.com>
Reviewed-by: Baochen Qiang <baochen.qiang@oss.qualcomm.com>
Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Link: https://patch.msgid.link/20260226051947.1379716-1-sarika.sharma@oss.qualcomm.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
Recently, we round up new_hdisplay once at most, for bonded dsi, we
may need twice, since they are independent links, we should round up
each half separately. This also aligns with the hdisplay we program
later in dsi_timing_setup()
Example:
full_hdisplay = 1904, dsc_bpp = 8, bpc = 8
new_full_hdisplay = DIV_ROUND_UP(1904 * 8, 8 * 3) = 635
if we use half display
new_half_hdisplay = DIV_ROUND_UP(952 * 8, 8 * 3) = 318
new_full_display = 636
Fixes: 7c9e4a554d ("drm/msm/dsi: Reduce pclk rate for compression")
Signed-off-by: Pengyu Luo <mitltlatltl@gmail.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/709716/
Link: https://lore.kernel.org/r/20260306163255.215456-1-mitltlatltl@gmail.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
One device specific fix here, it was possible we might end up trying to
dereference an invalid pointer while reporting a transfer timeout on
DesignWare controllers.
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Merge tag 'spi-fix-v7.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
Pull spi fix from Mark Brown:
"One device specific fix here, it was possible we might end up trying
to dereference an invalid pointer while reporting a transfer timeout
on DesignWare controllers"
* tag 'spi-fix-v7.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
spi: spi-dw-dma: fix print error log when wait finish transaction
Replace sprintf() with sysfs_emit() in sysfs show functions.
sysfs_emit() is preferred for formatting sysfs output because it
provides safer bounds checking. No functional changes.
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
[ rjw: Subject tweak ]
Link: https://patch.msgid.link/20260223210351.344388-2-thorsten.blum@linux.dev
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
A couple of small, driver specific fixes which might not even have much
impact if you have the affected devices depending on your setup.
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Merge tag 'regulator-fix-v7.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator
Pull regulator fixes from Mark Brown:
"A couple of small, driver specific fixes which might not even have
much impact if you have the affected devices depending on your setup"
* tag 'regulator-fix-v7.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator:
regulator: pf9453: Respect IRQ trigger settings from firmware
regulator: mt6363: Fix incorrect and redundant IRQ disposal in probe
Repeated intel_pstate disables currently return an error, adding unnecessary
complexity to userspace scripts which must first read the current state and
conditionally write 'off'.
Make repeated intel_pstate disables a no-op.
Signed-off-by: Fabio M. De Francesco <fabio.m.de.francesco@linux.intel.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://patch.msgid.link/20260219181600.16388-1-fabio.m.de.francesco@linux.intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Again a collection of device-specific fixes. Most of changes are
fairly small device-specific quirks of fixes for HD- and USB-audio,
ASoC Intel, AMD, fsl, Cirrus and co. The only large LOC is for
plumbing ASoC ACP driver to add the Cirrus Logic codec support, so
this one is also just adding some tables.
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Merge tag 'sound-7.0-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Pull sound fixes from Takashi Iwai:
"Again a collection of device-specific fixes. Most of changes are
fairly small device-specific quirks of fixes for HD- and USB-audio,
ASoC Intel, AMD, fsl, Cirrus and co.
The only large LOC is for plumbing ASoC ACP driver to add the Cirrus
Logic codec support, so this one is also just adding some tables"
* tag 'sound-7.0-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: (21 commits)
ALSA: us122l: drop redundant interface references
ASoC: amd: yc: Add DMI quirk for ASUS EXPERTBOOK PM1503CDA
ASoC: dt-bindings: renesas,rz-ssi: Document RZ/G3L SoC
ASoC: SDCA: Add allocation failure check for Entity name
ALSA: hda/senary: Ensure EAPD is enabled during init
ALSA: hda/senary: Use codec->core.afg for GPIO access
ALSA: doc: usb-audio: Add doc for QUIRK_FLAG_SKIP_IFACE_SETUP
ASoC: dt-bindings: tegra: Add compatible for Tegra238 sound card
ALSA: hda/hdmi: Add Tegra238 HDA codec device ID
ASoC: cs35l56: Suppress pointless warning about number of GPIO pulls
ASoC: amd: acp: Add ACP6.3 match entries for Cirrus Logic parts
ASoC: Intel: sof_sdw: Add quirk for Alienware Area 51 (2025) 0CCD SKU
ASoC: rt1321: fix DMIC ch2/3 mask issue
ASoC: cs35l56: Only patch ASP registers if the DAI is part of a DAIlink
ASoC: fsl_easrc: Fix event generation in fsl_easrc_iec958_set_reg()
ASoC: fsl_easrc: Fix event generation in fsl_easrc_iec958_put_bits()
ALSA: firewire: dice: Fix printf warning with W=1
ALSA: hda/tas2781: A workaround solution to lower-vol issue among lower calibrated-impedance micro-speaker on TAS2781
ALSA: hda/realtek: Add quirk for HP Pavilion 15-eh1xxx to enable mute LED
ALSA: usb-audio: Add iface reset and delay quirk for AB13X USB Audio
...
If trigger_data_alloc() fails and returns NULL, event_hist_trigger_parse()
jumps to the out_free error path. While kfree() safely handles a NULL
pointer, trigger_data_free() does not. This causes a NULL pointer
dereference in trigger_data_free() when evaluating
data->cmd_ops->set_filter.
Fix the problem by adding a NULL pointer check to trigger_data_free().
The problem was found by an experimental code review agent based on
gemini-3.1-pro while reviewing backports into v6.18.y.
Cc: Miaoqian Lin <linmq006@gmail.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Link: https://patch.msgid.link/20260305193339.2810953-1-linux@roeck-us.net
Fixes: 0550069cc2 ("tracing: Properly process error handling in event_hist_trigger_parse()")
Assisted-by: Gemini:gemini-3.1-pro
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This is an early-stage partial implementation that demonstrates the core
building blocks for nested sub-scheduler dispatching. While significant
work remains in the enqueue path and other areas, this patch establishes
the fundamental mechanisms needed for hierarchical scheduler operation.
The key building blocks introduced include:
- Private stack support for ops.dispatch() to prevent stack overflow when
walking down nested schedulers during dispatch operations
- scx_bpf_sub_dispatch() kfunc that allows parent schedulers to trigger
dispatch operations on their direct child schedulers
- Proper parent-child relationship validation to ensure dispatch requests
are only made to legitimate child schedulers
- Updated scx_dispatch_sched() to handle both nested and non-nested
invocations with appropriate kf_mask handling
The qmap scheduler is updated to demonstrate the functionality by calling
scx_bpf_sub_dispatch() on registered child schedulers when it has no
tasks in its own queues.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Add rhashtable-based lookup for sub-schedulers indexed by cgroup_id to
enable efficient scheduler discovery in preparation for multiple scheduler
support. The hash table allows quick lookup of the appropriate scheduler
instance when processing tasks from different cgroups.
This extends scx_link_sched() to register sub-schedulers in the hash table
and scx_unlink_sched() to remove them. A new scx_find_sub_sched() function
provides the lookup interface.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Factor out scx_link_sched() and scx_unlink_sched() functions to reduce
code duplication in the scheduler enable/disable paths.
No functional change.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
scx_bpf_reenqueue_local() currently re-enqueues all tasks on the local DSQ
regardless of which sub-scheduler owns them. With multiple sub-schedulers,
each should only re-enqueue tasks it owns or are owned by its descendants.
Replace the per-rq boolean flag with a lock-free linked list to track
per-scheduler reenqueue requests. Filter tasks in reenq_local() using
hierarchical ownership checks and block deferrals during bypass to prevent
use on dead schedulers.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Add a back pointer from scx_sched_pcpu to scx_sched. This will be used by
the next patch to make scx_bpf_reenqueue_local() sub-sched aware.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
The preceding changes implemented the framework to support cgroup
sub-scheds and updated scheduling paths and kfuncs so that they have
minimal but working support for sub-scheds. However, actual sub-sched
enabling/disabling hasn't been implemented yet and all tasks stayed on
scx_root.
Implement cgroup sub-sched enabling and disabling to actually activate
sub-scheds:
- Both enable and disable operations bypass only the tasks in the subtree
of the child being enabled or disabled to limit disruptions.
- When enabling, all candidate tasks are first initialized for the child
sched. Once that succeeds, the tasks are exited for the parent and then
switched over to the child. This adds a bit of complication but
guarantees that child scheduler failures are always contained.
- Disabling works the same way in the other direction. However, when the
parent may fail to initialize a task, disabling is propagated up to the
parent. While this means that a parent sched fail due to a child sched
event, the failure can only originate from the parent itself (its
ops.init_task()). The only effect a malfunctioning child can have on the
parent is attempting to move the tasks back to the parent.
After this change, although not all the necessary mechanisms are in place
yet, sub-scheds can take control of their tasks and schedule them.
v2: Fix missing scx_cgroup_unlock()/percpu_up_write() in abort path
(Cheng-Yang Chou).
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Extend scx_dump_state() to support multiple schedulers and improve task
identification in dumps. The function now takes a specific scheduler to
dump and can optionally filter tasks by scheduler.
scx_dump_task() now displays which scheduler each task belongs to, using
"*" to mark tasks owned by the scheduler being dumped. Sub-schedulers
are identified with their level and cgroup ID.
The SysRq-D handler now iterates through all active schedulers under
scx_sched_lock and dumps each one separately. For SysRq-D dumps, only
tasks owned by each scheduler are dumped to avoid redundancy since all
schedulers are being dumped. Error-triggered dumps continue to dump all
tasks since only that specific scheduler is being dumped.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
The scx_dump_state() function uses a regular spinlock to serialize
access. In a subsequent patch, this function will be called while
holding scx_sched_lock, which is a raw spinlock, creating a lock
nesting violation.
Convert the dump_lock to a raw spinlock and use the guard macro for
cleaner lock management.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Currently, the watchdog checks all tasks as if they are all on scx_root.
Move scx_watchdog_timeout inside scx_sched and make check_rq_for_timeouts()
use the timeout from the scx_sched associated with each task.
refresh_watchdog() is added, which determines the timer interval as half of
the shortest watchdog timeouts of all scheds and arms or disarms it as
necessary. Every scx_sched instance has equivalent or better detection
latency while sharing the same timer.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
scx_dsp_ctx and scx_dsp_max_batch are global variables used in the dispatch
path. In prepration for multiple scheduler support, move the former into
scx_sched_pcpu and the latter into scx_sched. No user-visible behavior
changes intended.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
The cgroup sub-sched support involves invasive changes to many areas of
sched_ext. The overall scaffolding is now in place and the next step is
implementing sub-sched enable/disable.
To enable partial testing and verification, update balance_one() to
dispatch from all scx_sched instances until it finds a task to run. This
should keep scheduling working when sub-scheds are enabled with tasks on
them. This will be replaced by BPF-driven hierarchical operation.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
When a sub-scheduler enters bypass mode, its tasks must be scheduled by an
ancestor to guarantee forward progress. Tasks from bypassing descendants are
queued in the bypass DSQs of the nearest non-bypassing ancestor, or the root
scheduler if all ancestors are bypassing. This requires coordination between
bypassing schedulers and their hosts.
Add bypass_enq_target_dsq() to find the correct bypass DSQ by walking up the
hierarchy until reaching a non-bypassing ancestor. When a sub-scheduler starts
bypassing, all its runnable tasks are re-enqueued after scx_bypassing() is set,
ensuring proper migration to ancestor bypass DSQs.
Update scx_dispatch_sched() to handle hosting bypassed descendants. When a
scheduler is not bypassing but has bypassing descendants, it must schedule both
its own tasks and bypassed descendant tasks. A simple policy is implemented
where every Nth dispatch attempt (SCX_BYPASS_HOST_NTH=2) consumes from the
bypass DSQ. A fallback consumption is also added at the end of dispatch to
ensure bypassed tasks make progress even when normal scheduling is idle.
Update enable_bypass_dsp() and disable_bypass_dsp() to increment
bypass_dsp_enable_depth on both the bypassing scheduler and its parent host,
ensuring both can detect that bypass dispatch is active through
bypass_dsp_enabled().
Add SCX_EV_SUB_BYPASS_DISPATCH event counter to track scheduling of bypassed
descendant tasks.
v2: Fix comment typos (Andrea).
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
The bypass_depth field tracks nesting of bypass operations but is also used
to determine whether the bypass dispatch path should be active. With
hierarchical scheduling, child schedulers may need to activate their parent's
bypass dispatch path without affecting the parent's bypass_depth, requiring
separation of these concerns.
Add bypass_dsp_enable_depth and bypass_dsp_claim to independently control
bypass dispatch path activation. The new enable_bypass_dsp() and
disable_bypass_dsp() functions manage this state with proper claim semantics
to prevent races. The bypass dispatch path now only activates when
bypass_dsp_enabled() returns true, which checks the new enable_depth counter.
The disable operation is carefully ordered after all tasks are moved out of
bypass DSQs to ensure they are drained before the dispatch path is disabled.
During scheduler teardown, disable_bypass_dsp() is called explicitly to ensure
cleanup even if bypass mode was never entered normally.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
The @prev parameter passed into ops.dispatch() is expected to be on the
same sched. Passing in @prev which isn't on the sched can spuriously
trigger failures that can kill the scheduler. Pass in @prev iff it's on
the same sched.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
In preparation of multiple scheduler support, factor out
scx_dispatch_sched() from balance_one(). The function boundary makes
remembering $prev_on_scx and $prev_on_rq less useful. Open code $prev_on_scx
in balance_one() and $prev_on_rq in both balance_one() and
scx_dispatch_sched().
No functional changes.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Bypass mode is used to simplify enable and disable paths and guarantee
forward progress when something goes wrong. When enabled, all tasks skip BPF
scheduling and fall back to simple in-kernel FIFO scheduling. While this
global behavior can be used as-is when dealing with sub-scheds, that would
allow any sub-sched instance to affect the whole system in a significantly
disruptive manner.
Make bypass state hierarchical by propagating it to descendants and updating
per-cpu flags accordingly. This allows an scx_sched to bypass if itself or
any of its ancestors are in bypass mode. However, this doesn't make the
actual bypass enqueue and dispatch paths hierarchical yet. That will be done
in later patches.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
In preparation of multiple scheduler support, make bypass state
per-scx_sched. Move scx_bypass_depth, bypass_timestamp and bypass_lb_timer
from globals into scx_sched. Move SCX_RQ_BYPASSING from rq to scx_sched_pcpu
as SCX_SCHED_PCPU_BYPASSING.
scx_bypass() now takes @sch and scx_rq_bypassing(rq) is replaced with
scx_bypassing(sch, cpu). All callers updated.
scx_bypassed_for_enable existed to balance the global scx_bypass_depth when
enable failed. Now that bypass_depth is per-scheduler, the counter is
destroyed along with the scheduler on enable failure. Remove
scx_bypassed_for_enable.
As all tasks currently use the root scheduler, there's no observable behavior
change.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
To support bypass mode for sub-schedulers, move bypass_dsq from struct scx_rq
to struct scx_sched_pcpu. Add bypass_dsq() helper. Move bypass_dsq
initialization from init_sched_ext_class() to scx_alloc_and_attach_sched().
bypass_lb_cpu() now takes a CPU number instead of rq pointer. All callers
updated. No behavior change as all tasks use the root scheduler.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
The abort state was tracked in the global scx_aborting flag which was used to
break out of potential live-lock scenarios when an error occurs. With
hierarchical scheduling, each scheduler instance must track its own abort
state independently so that an aborting scheduler doesn't interfere with
others.
Move the aborting flag into struct scx_sched and update all access sites. The
early initialization check in scx_root_enable() that warned about residual
aborting state is no longer needed as each scheduler instance now starts with
a clean state.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
The default time slice was stored in the global scx_slice_dfl variable which
was dynamically modified when entering and exiting bypass mode. With
hierarchical scheduling, each scheduler instance needs its own default slice
configuration so that bypass operations on one scheduler don't affect others.
Move slice_dfl into struct scx_sched and update all access sites. The bypass
logic now modifies the root scheduler's slice_dfl. At task initialization in
init_scx_entity(), use the SCX_SLICE_DFL constant directly since the task may
not yet be associated with a specific scheduler.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Call ops.core_sched_before() iff both tasks belong to the same scx_sched.
Otherwise, use timestamp based ordering.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
- Add the @sch parameter to scx_init_task() and drop @tg as it can be
obtained from @p. Separate out __scx_init_task() which does everything
except for the task state transition.
- Add the @sch parameter to scx_enable_task(). Separate out
__scx_enable_task() which does everything except for the task state
transition.
- Add the @sch parameter to scx_disable_task().
- Rename scx_exit_task() to scx_disable_and_exit_task() and separate out
__scx_disable_and_exit_task() which does everything except for the task
state transition.
While some task state transitions are relocated, no meaningful behavior
changes are expected.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
scx_bpf_dsq_move[_vtime]() calls scx_dsq_move() to move task from a DSQ to
another. However, @p doesn't necessarily have to come form the containing
iteration and can thus be a task which belongs to another scx_sched. Verify
that @p is on the same scx_sched as the DSQ being iterated.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
scx_bpf_task_set_slice() and scx_bpf_task_set_dsq_vtime() now verify that
the calling scheduler has authority over the task before allowing updates.
This prevents schedulers from modifying tasks that don't belong to them in
hierarchical scheduling configurations.
Direct writes to p->scx.slice and p->scx.dsq_vtime are deprecated and now
trigger warnings. They will be disallowed in a future release.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Add checks to enforce scheduling authority boundaries when multiple
schedulers are present:
1. In scx_dsq_insert_preamble() and the dispatch retry path, ignore attempts
to insert tasks that the scheduler doesn't own, counting them via
SCX_EV_INSERT_NOT_OWNED. As BPF schedulers are allowed to ignore
dequeues, such attempts can occur legitimately during sub-scheduler
enabling when tasks move between schedulers. The counter helps distinguish
normal cases from scheduler bugs.
2. For scx_bpf_dsq_insert_vtime() and scx_bpf_select_cpu_and(), error out
when sub-schedulers are attached. These functions lack the aux__prog
parameter needed to identify the calling scheduler, so they cannot be used
safely with multiple schedulers. BPF programs should use the arg-wrapped
versions (__scx_bpf_dsq_insert_vtime() and __scx_bpf_select_cpu_and())
instead.
These checks ensure that with multiple concurrent schedulers, scheduler
identity can be properly determined and unauthorized task operations are
prevented or tracked.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
In preparation for multiple scheduler support, introduce scx_prog_sched()
accessor which returns the scx_sched instance associated with a BPF program.
The association is determined via the special KF_IMPLICIT_ARGS kfunc
parameter, which provides access to bpf_prog_aux. This aux can be used to
retrieve the struct_ops (sched_ext_ops) that the program is associated with,
and from there, the corresponding scx_sched instance.
For compatibility, when ops.sub_attach is not implemented (older schedulers
without sub-scheduler support), unassociated programs fall back to scx_root.
A warning is logged once per scheduler for such programs.
As scx_root is still the only scheduler, this shouldn't introduce
user-visible behavior changes.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
In preparation of multiple scheduler support, add p->scx.sched which points
to the scx_sched instance that the task is scheduled by, which is currently
always scx_root. Add scx_task_sched[_rcu]() accessors which return the
associated scx_sched of the specified task and replace the raw scx_root
dereferences with it where applicable. scx_task_on_sched() is also added to
test whether a given task is on the specified sched.
As scx_root is still the only scheduler, this shouldn't introduce
user-visible behavior changes.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
A system often runs multiple workloads especially in multi-tenant server
environments where a system is split into partitions servicing separate
more-or-less independent workloads each requiring an application-specific
scheduler. To support such and other use cases, sched_ext is in the process
of growing multiple scheduler support.
When partitioning a system in terms of CPUs for such use cases, an
oft-taken approach is hard partitioning the system using cpuset. While it
would be possible to tie sched_ext multiple scheduler support to cpuset
partitions, such an approach would have fundamental limitations stemming
from the lack of dynamism and flexibility.
Users often don't care which specific CPUs are assigned to which workload
and want to take advantage of optimizations which are enabled by running
workloads on a larger machine - e.g. opportunistic over-commit, improving
latency critical workload characteristics while maintaining bandwidth
fairness, employing control mechanisms based on different criteria than
on-CPU time for e.g. flexible memory bandwidth isolation, packing similar
parts from different workloads on same L3s to improve cache efficiency,
and so on.
As this sort of dynamic behaviors are impossible or difficult to implement
with hard partitioning, sched_ext is implementing cgroup sub-sched support
where schedulers can be attached to the cgroup hierarchy and a parent
scheduler is responsible for controlling the CPUs that each child can use
at any given moment. This makes CPU distribution dynamically controlled by
BPF allowing high flexibility.
This patch adds the skeletal sched_ext cgroup sub-sched support:
- sched_ext_ops.sub_cgroup_id and .sub_attach/detach() are added. Non-zero
sub_cgroup_id indicates that the scheduler is to be attached to the
identified cgroup. A sub-sched is attached to the cgroup iff the nearest
ancestor scheduler implements .sub_attach() and grants the attachment. Max
nesting depth is limited by SCX_SUB_MAX_DEPTH.
- When a scheduler exits, all its descendant schedulers are exited
together. Also, cgroup.scx_sched added which points to the effective
scheduler instance for the cgroup. This is updated on scheduler
init/exit and inherited on cgroup online. When a cgroup is offlined, the
attached scheduler is automatically exited.
- Sub-sched support is gated on CONFIG_EXT_SUB_SCHED which is
automatically enabled if both SCX and cgroups are enabled. Sub-sched
support is not tied to the CPU controller but rather the cgroup
hierarchy itself. This is intentional as the support for cpu.weight and
cpu.max based resource control is orthogonal to sub-sched support. Note
that CONFIG_CGROUPS around cgroup subtree iteration support for
scx_task_iter is replaced with CONFIG_EXT_SUB_SCHED for consistency.
- This allows loading sub-scheds and most framework operations such as
propagating disable down the hierarchy work. However, sub-scheds are not
operational yet and all tasks stay with the root sched. This will serve
as the basis for building up full sub-sched support.
- DSQs point to the scx_sched they belong to.
- scx_qmap is updated to allow attachment of sub-scheds and also serving
as sub-scheds.
- scx_is_descendant() is added but not yet used in this patch. It is used by
later changes in the series and placed here as this is where the function
belongs.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
In preparation for multiple scheduler support, reorganize the enable and
disable paths to make scheduler instances explicit. Extract
scx_root_disable() from scx_disable_workfn(). Rename scx_enable_workfn()
to scx_root_enable_workfn(). Change scx_disable() to take @sch parameter
and only queue disable_work if scx_claim_exit() succeeds for consistency.
Move exit_kind validation into scx_claim_exit(). The sysrq handler now
prints a message when no scheduler is loaded.
These changes don't materially affect user-visible behavior.
v2: Keep scx_enable() name as-is and only rename the workfn to
scx_root_enable_workfn(). Change scx_enable() return type to s32.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
- Always trigger the warning if p->scx.disallow is set for fork inits. There
is no reason to set it during forks.
- Flip the positions of if/else arms to ease adding error conditions.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
The planned sched_ext cgroup sub-scheduler support needs the newly forked
task to be associated with its cgroup in its post_fork() hook. There is no
existing ordering requirement between the two now. Swap them and note the
new ordering requirement.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Cc: Ingo Molnar <mingo@redhat.com>
Make sched_cgroup_fork() pass @kargs to scx_fork(). This will be used to
determine @p's cgroup for cgroup sub-sched support.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Cc: Peter Zijlstra <peterz@infradead.org>
For the planned cgroup sub-scheduler support, enable/disable operations are
going to be subtree specific and iterating all tasks in the system for those
operations can be unnecessarily expensive and disruptive.
cgroup already has mechanisms to perform subtree task iterations. Implement
cgroup subtree iteration for scx_task_iter:
- Add optional @cgrp to scx_task_iter_start() which enables cgroup subtree
iteration.
- Make scx_task_iter use css_next_descendant_pre() and css_task_iter to
iterate all tasks in the cgroup subtree.
- Update all existing callers to pass NULL to maintain current behavior.
The two iteration mechanisms are independent and duplicate. It's likely that
scx_tasks can be removed in favor of always using cgroup iteration if
CONFIG_SCHED_CLASS_EXT depends on CONFIG_CGROUPS.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Fixes and New HW Support
- alienware-wmi-wmax: Add G-Mode support to m18 laptops
- asus-armoury: Add support for FA401UM, G733QS, GX650RX
- dell-wmi-sysman: Don't hex dump plaintext password data
- hp-bioscfg: Support large number of enumeration attributes
- hp-wmi: Add support for Omen 14-fb1xxx, 16-xd0xxx and 16-wf0xxx,
Victus-d0xxx
- int3472: Handle GPIO type 0x10 (DOVDD)
- intel-hid:
- Add Dell 14 & 16 Plus 2-in-1 to dmi_vgbs_allow_list
- Enable 5-button array on ThinkPad X1 Fold 16 Gen 1
- mellanox: mlxreg: Fix kernel-doc warnings
- oxpec: Add support for OneXPlayer X1 Air, X1z, APEX, and Aokzoe A2 Pro
- redmi-wmi: Add more Fn hotkey mappings
- thinkpad_acpi: Fix errors reading battery thresholds
- touchscreen_dmi: Add quirk for y-inverted Goodix touchscreen on SUPI S10
- uniwill-laptop:
- FN lock/super key lock attributes rename
- Fix crash on unexpected battery event
- A special key combination can alter FN lock status so mark it volatile
- Handle FN lock event
The following is an automated shortlog grouped by driver:
alienware-wmi-wmax:
- Add G-Mode support to m18 laptops
asus-armoury:
- add support for FA401UM
- add support for G733QS
- add support for GX650RX
dell-wmi:
- Add audio/mic mute key codes
dell-wmi-sysman:
- Don't hex dump plaintext password data
hp-bioscfg:
- Support allocations of larger data
hp-wmi:
- add Omen 14-fb1xxx (board 8E41) support
- Add Omen 16-wf0xxx fan and thermal support
- Add Omen 16-xd0xxx fan and thermal support
- Add Victus 16-d0xxx support
int3472:
- Handle GPIO type 0x10 (DOVDD)
intel-hid:
- Add Dell 14 Plus 2-in-1 to dmi_vgbs_allow_list
- Add Dell 16 Plus 2-in-1 to dmi_vgbs_allow_list
- Enable 5-button array on ThinkPad X1 Fold 16 Gen 1
oxpec:
- Add support for Aokzoe A2 Pro
- Add support for OneXPlayer APEX
- Add support for OneXPlayer X1 Air
- Add support for OneXPlayer X1z
platform_data/mlxreg: mlxreg.h:
- fix all kernel-doc warnings
redmi-wmi:
- Add more hotkey mappings
thinkpad_acpi:
- Fix errors reading battery thresholds
touchscreen_dmi:
- Add quirk for y-inverted Goodix touchscreen on SUPI S10
uniwill-laptop:
- Fix crash on unexpected battery event
- Handle FN lock event
- Mark FN lock status as being volatile
- Rename FN lock and super key lock attrs
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Merge tag 'platform-drivers-x86-v7.0-2' of git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86
Pull x86 platform driver fixes from Ilpo Järvinen:
- alienware-wmi-wmax: Add G-Mode support to m18 laptops
- asus-armoury: Add support for FA401UM, G733QS, GX650RX
- dell-wmi-sysman: Don't hex dump plaintext password data
- hp-bioscfg: Support large number of enumeration attributes
- hp-wmi: Add support for Omen 14-fb1xxx, 16-xd0xxx, 16-wf0xxx, and
Victus-d0xxx
- int3472: Handle GPIO type 0x10 (DOVDD)
- intel-hid:
- Add Dell 14 & 16 Plus 2-in-1 to dmi_vgbs_allow_list
- Enable 5-button array on ThinkPad X1 Fold 16 Gen 1
- mellanox: mlxreg: Fix kernel-doc warnings
- oxpec: Add support for OneXPlayer X1 Air, X1z, APEX, and Aokzoe A2
Pro
- redmi-wmi: Add more Fn hotkey mappings
- thinkpad_acpi: Fix errors reading battery thresholds
- touchscreen_dmi: Add quirk for y-inverted Goodix touchscreen on SUPI
S10
- uniwill-laptop:
- FN lock/super key lock attributes rename
- Fix crash on unexpected battery event
- A special key combination can alter FN lock status so mark it
volatile
- Handle FN lock event
* tag 'platform-drivers-x86-v7.0-2' of git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86: (27 commits)
platform/x86: dell-wmi-sysman: Don't hex dump plaintext password data
platform_data/mlxreg: mlxreg.h: fix all kernel-doc warnings
platform/x86: asus-armoury: add support for FA401UM
platform/x86: asus-armoury: add support for GX650RX
platform/x86: hp-bioscfg: Support allocations of larger data
platform/x86: oxpec: Add support for Aokzoe A2 Pro
platform/x86: oxpec: Add support for OneXPlayer X1 Air
platform/x86: oxpec: Add support for OneXPlayer X1z
platform/x86: oxpec: Add support for OneXPlayer APEX
platform/x86: uniwill-laptop: Handle FN lock event
platform/x86: uniwill-laptop: Mark FN lock status as being volatile
platform/x86: uniwill-laptop: Fix crash on unexpected battery event
platform/x86: uniwill-laptop: Rename FN lock and super key lock attrs
platform/x86: redmi-wmi: Add more hotkey mappings
platform/x86: alienware-wmi-wmax: Add G-Mode support to m18 laptops
platform/x86: hp-wmi: add Omen 14-fb1xxx (board 8E41) support
platform/x86: dell-wmi: Add audio/mic mute key codes
platform/x86: hp-wmi: Add Victus 16-d0xxx support
platform/x86: intel-hid: Enable 5-button array on ThinkPad X1 Fold 16 Gen 1
platform/x86: int3472: Handle GPIO type 0x10 (DOVDD)
...
