With the Pyhton version, the actual output happens after parsing,
from records stored at self.entries.
Ensure that line numbers will be properly stored there and
that they'll produce the desired results at the ReST output.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/5182a531d14b5fe9e1fc5da5f9dae05d66852a60.1744106242.git.mchehab+huawei@kernel.org
Instead of setting file lists at __init__ time, move it to
the actual parsing function. This allows adding more files
to be parsed in real time, by calling parse function multiple
times.
With the new way, the export_files logic was rewritten to
avoid parsing twice EXPORT_SYMBOL for partial matches.
Please notice that, with this logic, it can still read the
same file twice when export_file is used.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/ab10bc94050406ce6536d4944b5d718ecd70812f.1744106242.git.mchehab+huawei@kernel.org
The KernelFiles class is the main dispatcher which parses each
source file.
In preparation for letting kerneldoc Sphinx extension to import
Python libraries, move regex ancillary classes to a separate
file.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/80bc855e128a9ff0a11df5afe9ba71775dfc9a0f.1744106241.git.mchehab+huawei@kernel.org
Handing nested parenthesis with regular expressions is not an
easy task. It is even harder with Python's re module, as it
has a limited subset of regular expressions, missing more
advanced features.
We might use instead Python regex module, but still the
regular expressions are very hard to understand. So, instead,
add a logic to properly match delimiters.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/74dee485f70b7ce85e90496bfdd360283a677a58.1744106241.git.mchehab+huawei@kernel.org
While doing the conversion, we opted to skip empty sections
(description, return), but this makes harder to see the differences
between kernel-doc (Perl) and kernel-doc.py.
Also, the logic doesn't always work properly. So, change the
way this is done by adding an extra step to remove such
sections, doing it only for Return and Description.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/1b057092a48ba61d92a411f4f6d505b802913785.1744106241.git.mchehab+huawei@kernel.org
Maintaining kernel-doc has been a challenge, as there aren't many
perl developers among maintainers. Also, the logic there is too
complex. Having lots of global variables and using pure functions
doesn't help.
Rewrite the script in Python, placing most global variables
inside classes. This should help maintaining the script in long
term.
It also allows a better integration with kernel-doc Sphinx
extension in the future.
I opted to keep this version as close as possible to what we
have already in Perl. There are some differences though:
1. There is one regular expression that required a rewrite:
/\bSTRUCT_GROUP(\(((?:(?>[^)(]+)|(?1))*)\))[^;]*;/
As this one uses two features that aren't available by the native
Python regular expression module (re):
- recursive patterns: ?1
- atomic grouping (?>...)
Rewrite it to use a much simpler regular expression:
/\bSTRUCT_GROUP\(([^\)]+)\)[^;]*;/
Extra care should be taken when validating this script, as such
replacement might cause some regressions.
2. The filters are now applied only during output generation.
In particular, "nosymbol" argument is only handled there.
It means that, if the same file is processed twice for
different symbols, the warnings will be duplicated.
I opted to use this behavior as it allows the Sphinx extension
to read the file(s) only once, and apply the filtering only
when producing the ReST output. This hopefully will help
to speed up doc generation
3. This version can handle multiple files and multiple directories.
So, if one just wants to produce a big output with everything
inside a file, this could be done with
$ time ./scripts/kernel-doc.py -man . 2>/dev/null >new
real 0m54.592s
user 0m53.345s
sys 0m0.997s
4. I tried to replicate as much as possible the same arguments
from kernel-doc, with about the same behavior, for the
command line parameters starting with a single dash (-parameter).
I also added one letter aliases for each parameter, and a
--parameter (sometimes with a better name).
5. There are some sutile nuances between how Perl handles
certain regular expressions. In special, the qr operatior,
which compiles a regular expression also works as a
non-capturing group. It means that some regexes like
this one:
my $type1 = qr{[\w\s]+};
needs to be mapped as:
type1 = r'(?:[\w\s]+)?'
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/2fa671a9fb08d03a376a42d46cc0b1d3aab4ae3f.1744106241.git.mchehab+huawei@kernel.org
Directly assign the last bucket value instead of calling which_bucket()
when next_timer_ns equals KTIME_MAX, the largest possible value that
always falls into the last bucket.
This avoids unnecessary calculations and enhances performance.
Reviewed-by: Christian Loehle <christian.loehle@arm.com>
Signed-off-by: Zhongqiu Han <quic_zhonhan@quicinc.com>
Link: https://patch.msgid.link/20250405135308.1854342-1-quic_zhonhan@quicinc.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Merge series from Alexis Czezar Torreno <alexisczezar.torreno@analog.com>:
Introduce a regulator driver support for ADP5055. The device combines 3
high performance buck regulators in a 43-termminal land grid array
package. The device enables direct connection to high input voltages up
to 18V with no preregulator. Channel 1 and 2 deliver a programmable
output current of 3.5A or 7.5A or provide a single output with up to 14A
in parallel operation. Channel 3 has a programmable output current of
1.5A or 3A.
During a context-switch, tls_thread_switch() reads and writes a task's
thread_struct::tpidr2_el0 field. Other code shouldn't access this field
for an active task, as such accesses would form a data-race with a
concurrent context-switch.
The usage in preserve_tpidr2_context() is suspicious, but benign as any
race with a context switch will write the same value back to
current->thread.tpidr2_el0.
Make this clearer and match restore_tpidr2_context() by using a
temporary variable instead, avoiding the (benign) data-race.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250409164010.3480271-14-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
There are several issues with the way the native signal handling code
manipulates FPSIMD/SVE/SME state, described in detail below. These
issues largely result from races with preemption and inconsistent
handling of live state vs saved state.
Known issues with native FPSIMD/SVE/SME state management include:
* On systems with FPMR, the code to save/restore the FPMR accesses the
register while it is not owned by the current task. Consequently, this
may corrupt the FPMR of the current task and/or may corrupt the FPMR
of an unrelated task. The FPMR save/restore has been broken since it
was introduced in commit:
8c46def444 ("arm64/signal: Add FPMR signal handling")
* On systems with SME, setup_return() modifies both the live register
state and the saved state register state regardless of whether the
task's state is live, and without holding the cpu fpsimd context.
Consequently:
- This may corrupt the state an unrelated task which has PSTATE.SM set
and/or PSTATE.ZA set.
- The task may enter the signal handler in streaming mode, and or with
ZA storage enabled unexpectedly.
- The task may enter the signal handler in non-streaming SVE mode with
stale SVE register state, which may have been inherited from
streaming SVE mode unexpectedly. Where the streaming and
non-streaming vector lengths differ, this may be packed into
registers arbitrarily.
This logic has been broken since it was introduced in commit:
40a8e87bb3 ("arm64/sme: Disable ZA and streaming mode when handling signals")
Further incorrect manipulation of state was added in commits:
ea64baacbc ("arm64/signal: Flush FPSIMD register state when disabling streaming mode")
baa8515281 ("arm64/fpsimd: Track the saved FPSIMD state type separately to TIF_SVE")
* Several restoration functions use fpsimd_flush_task_state() to discard
the live FPSIMD/SVE/SME while the in-memory copy is stale.
When a subset of the FPSIMD/SVE/SME state is restored, the remainder
may be non-deterministically reset to a stale snapshot from some
arbitrary point in the past.
This non-deterministic discarding was introduced in commit:
8cd969d28f ("arm64/sve: Signal handling support")
As of that commit, when TIF_SVE was initially clear, failure to
restore the SVE signal frame could reset the FPSIMD registers to a
stale snapshot.
The pattern of discarding unsaved state was subsequently copied into
restoration functions for some new state in commits:
39782210eb ("arm64/sme: Implement ZA signal handling")
ee072cf708 ("arm64/sme: Implement signal handling for ZT")
* On systems with SME/SME2, the entire FPSIMD/SVE/SME state may be
loaded onto the CPU redundantly. Either restore_fpsimd_context() or
restore_sve_fpsimd_context() will load the entire FPSIMD/SVE/SME state
via fpsimd_update_current_state() before restore_za_context() and
restore_zt_context() each discard the state via
fpsimd_flush_task_state().
This is purely redundant work, and not a functional bug.
To fix these issues, rework the native signal handling code to always
save+flush the current task's FPSIMD/SVE/SME state before manipulating
that state. This avoids races with preemption and ensures that state is
manipulated consistently regardless of whether it happened to be live
prior to manipulation. This largely involes:
* Using fpsimd_save_and_flush_current_state() to save+flush the state
for both signal delivery and signal return, before the state is
manipulated in any way.
* Removing fpsimd_signal_preserve_current_state() and updating
preserve_fpsimd_context() to explicitly ensure that the FPSIMD state
is up-to-date, as preserve_fpsimd_context() is the only consumer of
the FPSIMD state during signal delivery.
* Modifying fpsimd_update_current_state() to not reload the FPSIMD state
onto the CPU. Ideally we'd remove fpsimd_update_current_state()
entirely, but I've left that for subsequent patches as there are a
number of of other problems with the FPSIMD<->SVE conversion helpers
that should be addressed at the same time. For now I've removed the
misleading comment.
For setup_return(), we need to decide (for ABI reasons) whether signal
delivery should have all the side-effects of an SMSTOP. For now I've
left a TODO comment, as there are other questions in this area that I'll
address with subsequent patches.
Fixes: 8c46def444 ("arm64/signal: Add FPMR signal handling")
Fixes: 40a8e87bb3 ("arm64/sme: Disable ZA and streaming mode when handling signals")
Fixes: ea64baacbc ("arm64/signal: Flush FPSIMD register state when disabling streaming mode")
Fixes: baa8515281 ("arm64/fpsimd: Track the saved FPSIMD state type separately to TIF_SVE")
Fixes: 8cd969d28f ("arm64/sve: Signal handling support")
Fixes: 39782210eb ("arm64/sme: Implement ZA signal handling")
Fixes: ee072cf708 ("arm64/sme: Implement signal handling for ZT")
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250409164010.3480271-13-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
There are several issues with the way the native signal handling code
manipulates FPSIMD/SVE/SME state. To fix those issues, subsequent
patches will rework the native signal handling code to always save+flush
the current task's FPSIMD/SVE/SME state before manipulating that state.
In preparation for those changes, rework the compat signal handling code
to save+flush the current task's FPSIMD state before manipulating it.
Subsequent patches will remove fpsimd_signal_preserve_current_state()
and fpsimd_update_current_state(). Compat tasks can only have FPSIMD
state, and cannot have any SVE or SME state. Thus, the SVE state
manipulation present in fpsimd_signal_preserve_current_state() and
fpsimd_update_current_state() is not necessary, and it is safe to
directly manipulate current->thread.uw.fpsimd_state once it has been
saved+flushed.
Use fpsimd_save_and_flush_current_state() to save+flush the state for
both signal delivery and signal return, before the state is manipulated
in any way. While it would be safe for compat_restore_vfp_context() to
use fpsimd_flush_task_state(current), there are several extant issues in
the native signal code resulting from incorrect use of
fpsimd_flush_task_state(), and for consistency it is preferable to use
fpsimd_save_and_flush_current_state().
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250409164010.3480271-12-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
When the current task's FPSIMD/SVE/SME state may be live on *any* CPU in
the system, special care must be taken when manipulating that state, as
this manipulation can race with preemption and/or asynchronous usage of
FPSIMD/SVE/SME (e.g. kernel-mode NEON in softirq handlers).
Even when manipulation is is protected with get_cpu_fpsimd_context() and
get_cpu_fpsimd_context(), the logic necessary when the state is live on
the current CPU can be wildly different from the logic necessary when
the state is not live on the current CPU. A number of historical and
extant issues result from failing to handle these cases consistetntly
and/or correctly.
To make it easier to get such manipulation correct, add a new
fpsimd_save_and_flush_current_state() helper function, which ensures
that the current task's state has been saved to memory and any stale
state on any CPU has been "flushed" such that is not live on any CPU in
the system. This will allow code to safely manipulate the saved state
without risk of races.
Subsequent patches will use the new function.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250409164010.3480271-11-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
For backwards compatibility reasons, when a signal return occurs which
restores SVE state, the effective lower 128 bits of each of the SVE
vector registers are restored from the corresponding FPSIMD vector
register in the FPSIMD signal frame, overriding the values in the SVE
signal frame. This is intended to be the case regardless of streaming
mode.
To make this happen, restore_sve_fpsimd_context() uses
fpsimd_update_current_state() to merge the lower 128 bits from the
FPSIMD signal frame into the SVE register state. Unfortunately,
fpsimd_update_current_state() performs this merging dependent upon
TIF_SVE, which is not always correct for streaming SVE register state:
* When restoring non-streaming SVE register state there is no observable
problem, as the signal return code configures TIF_SVE and the saved
fp_type to match before calling fpsimd_update_current_state(), which
observes either:
- TIF_SVE set AND fp_type == FP_STATE_SVE
- TIF_SVE clear AND fp_type == FP_STATE_FPSIMD
* On systems which have SME but not SVE, TIF_SVE cannot be set. Thus the
merging will never happen for the streaming SVE register state.
* On systems which have SVE and SME, TIF_SVE can be set and cleared
independently of PSTATE.SM. Thus the merging may or may not happen for
streaming SVE register state.
As TIF_SVE can be cleared non-deterministically during syscalls
(including at the start of sigreturn()), the merging may occur
non-deterministically from the perspective of userspace.
This logic has been broken since its introduction in commit:
85ed24dad2 ("arm64/sme: Implement streaming SVE signal handling")
... at which point both fpsimd_signal_preserve_current_state() and
fpsimd_update_current_state() only checked TIF SVE. When PSTATE.SM==1
and TIF_SVE was clear, signal delivery would place stale FPSIMD state
into the FPSIMD signal frame, and signal return would not merge this
into the restored register state.
Subsequently, signal delivery was fixed as part of commit:
61da7c8e2a ("arm64/signal: Don't assume that TIF_SVE means we saved SVE state")
... but signal restore was not given a corresponding fix, and when
TIF_SVE was clear, signal restore would still fail to merge the FPSIMD
state into the restored SVE register state. The 'Fixes' tag did not
indicate that this had been broken since its introduction.
Fix this by merging the FPSIMD state dependent upon the saved fp_type,
matching what we (currently) do during signal delivery.
As described above, when backporting this commit, it will also be
necessary to backport commit:
61da7c8e2a ("arm64/signal: Don't assume that TIF_SVE means we saved SVE state")
... and prior to commit:
baa8515281 ("arm64/fpsimd: Track the saved FPSIMD state type separately to TIF_SVE")
... it will be necessary for fpsimd_signal_preserve_current_state() and
fpsimd_update_current_state() to consider both TIF_SVE and
thread_sm_enabled(¤t->thread), in place of the saved fp_type.
Fixes: 85ed24dad2 ("arm64/sme: Implement streaming SVE signal handling")
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250409164010.3480271-10-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
An exec() is expected to reset all FPSIMD/SVE/SME state, and barring
special handling of the vector lengths, the state is expected to reset
to zero. This reset is handled in fpsimd_flush_thread(), which the core
exec() code calls via flush_thread().
When support was added for FPMR, no logic was added to
fpsimd_flush_thread() to reset the FPMR value, and thus it is
erroneously inherited across an exec().
Add the missing reset of FPMR.
Fixes: 203f2b95a8 ("arm64/fpsimd: Support FEAT_FPMR")
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250409164010.3480271-9-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
On system with SME, a thread's kernel FPSIMD state may be erroneously
clobbered during a context switch immediately after that state is
restored. Systems without SME are unaffected.
If the CPU happens to be in streaming SVE mode before a context switch
to a thread with kernel FPSIMD state, fpsimd_thread_switch() will
restore the kernel FPSIMD state using fpsimd_load_kernel_state() while
the CPU is still in streaming SVE mode. When fpsimd_thread_switch()
subsequently calls fpsimd_flush_cpu_state(), this will execute an
SMSTOP, causing an exit from streaming SVE mode. The exit from
streaming SVE mode will cause the hardware to reset a number of
FPSIMD/SVE/SME registers, clobbering the FPSIMD state.
Fix this by calling fpsimd_flush_cpu_state() before restoring the kernel
FPSIMD state.
Fixes: e92bee9f86 ("arm64/fpsimd: Avoid erroneous elide of user state reload")
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250409164010.3480271-8-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
When the effective value of PSTATE.SM is changed from 0 to 1 or from 1
to 0 by any method, an entry or exit to/from streaming SVE mode is
performed, and hardware automatically resets a number of registers. As
of ARM DDI 0487 L.a, this means:
* All implemented bits of the SVE vector registers are set to zero.
* All implemented bits of the SVE predicate registers are set to zero.
* All implemented bits of FFR are set to zero, if FFR is implemented in
the new mode.
* FPSR is set to 0x0000_0000_0800_009f.
* FPMR is set to 0, if FPMR is implemented.
Currently task_fpsimd_load() restores FPMR before restoring SVCR (which
is an accessor for PSTATE.{SM,ZA}), and so the restored value of FPMR
may be clobbered if the restored value of PSTATE.SM happens to differ
from the initial value of PSTATE.SM.
Fix this by moving the restore of FPMR later.
Note: this was originally posted as [1].
Fixes: 203f2b95a8 ("arm64/fpsimd: Support FEAT_FPMR")
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/linux-arm-kernel/20241204-arm64-sme-reenable-v2-2-bae87728251d@kernel.org/
[ Rutland: rewrite commit message ]
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20250409164010.3480271-7-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
The logic for handling SME traps manipulates saved FPSIMD/SVE/SME state
incorrectly, and a race with preemption can result in a task having
TIF_SME set and TIF_FOREIGN_FPSTATE clear even though the live CPU state
is stale (e.g. with SME traps enabled). This can result in warnings from
do_sme_acc() where SME traps are not expected while TIF_SME is set:
| /* With TIF_SME userspace shouldn't generate any traps */
| if (test_and_set_thread_flag(TIF_SME))
| WARN_ON(1);
This is very similar to the SVE issue we fixed in commit:
751ecf6afd ("arm64/sve: Discard stale CPU state when handling SVE traps")
The race can occur when the SME trap handler is preempted before and
after manipulating the saved FPSIMD/SVE/SME state, starting and ending on
the same CPU, e.g.
| void do_sme_acc(unsigned long esr, struct pt_regs *regs)
| {
| // Trap on CPU 0 with TIF_SME clear, SME traps enabled
| // task->fpsimd_cpu is 0.
| // per_cpu_ptr(&fpsimd_last_state, 0) is task.
|
| ...
|
| // Preempted; migrated from CPU 0 to CPU 1.
| // TIF_FOREIGN_FPSTATE is set.
|
| get_cpu_fpsimd_context();
|
| /* With TIF_SME userspace shouldn't generate any traps */
| if (test_and_set_thread_flag(TIF_SME))
| WARN_ON(1);
|
| if (!test_thread_flag(TIF_FOREIGN_FPSTATE)) {
| unsigned long vq_minus_one =
| sve_vq_from_vl(task_get_sme_vl(current)) - 1;
| sme_set_vq(vq_minus_one);
|
| fpsimd_bind_task_to_cpu();
| }
|
| put_cpu_fpsimd_context();
|
| // Preempted; migrated from CPU 1 to CPU 0.
| // task->fpsimd_cpu is still 0
| // If per_cpu_ptr(&fpsimd_last_state, 0) is still task then:
| // - Stale HW state is reused (with SME traps enabled)
| // - TIF_FOREIGN_FPSTATE is cleared
| // - A return to userspace skips HW state restore
| }
Fix the case where the state is not live and TIF_FOREIGN_FPSTATE is set
by calling fpsimd_flush_task_state() to detach from the saved CPU
state. This ensures that a subsequent context switch will not reuse the
stale CPU state, and will instead set TIF_FOREIGN_FPSTATE, forcing the
new state to be reloaded from memory prior to a return to userspace.
Note: this was originallly posted as [1].
Fixes: 8bd7f91c03 ("arm64/sme: Implement traps and syscall handling for SME")
Reported-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/linux-arm-kernel/20241204-arm64-sme-reenable-v2-1-bae87728251d@kernel.org/
[ Rutland: rewrite commit message ]
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20250409164010.3480271-6-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
When a task's SVE vector length (NSVL) is changed, and the task happens
to have SVCR.{SM,ZA}=={0,0}, vec_set_vector_length() opportunistically
frees the task's sme_state and clears TIF_SME.
The opportunistic freeing was added with no rationale in commit:
d4d5be94a8 ("arm64/fpsimd: Ensure SME storage is allocated after SVE VL changes")
That commit fixed an unrelated problem where the task's sve_state was
freed while it could be used to store streaming mode register state,
where the fix was to re-allocate the task's sve_state.
There is no need to free and/or reallocate the task's sme_state when the
SVE vector length changes, and there is no need to clear TIF_SME. Given
the SME vector length (SVL) doesn't change, the task's sme_state remains
correctly sized.
Remove the unnecessary opportunistic freeing of the task's sme_state
when the task's SVE vector length is changed. The task's sme_state is
still freed when the SME vector length is changed.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250409164010.3480271-5-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
When task_fpsimd_load() loads the saved FPSIMD/SVE/SME state, it
configures EL0 SVE traps by calling sve_user_{enable,disable}(). This is
unnecessary, and this is suspicious/confusing as task_fpsimd_load() does
not configure EL0 SME traps.
All calls to task_fpsimd_load() are followed by a call to
fpsimd_bind_task_to_cpu(), where the latter configures traps for SVE and
SME dependent upon the current values of TIF_SVE and TIF_SME, overriding
any trap configuration performed by task_fpsimd_load().
The calls to sve_user_{enable,disable}() calls in task_fpsimd_load()
have been redundant (though benign) since they were introduced in
commit:
a0136be443 ("arm64/fpsimd: Load FP state based on recorded data type")
Remove the unnecessary and confusing SVE trap manipulation.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250409164010.3480271-4-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
There have been no users of fpsimd_force_sync_to_sve() since commit:
bbc6172eef ("arm64/fpsimd: SME no longer requires SVE register state")
Remove fpsimd_force_sync_to_sve().
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20250409164010.3480271-3-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
The SME trap handler consumes RES0 bits from the ESR when determining
the reason for the trap, and depends upon those bits reading as zero.
This may break in future when those RES0 bits are allocated a meaning
and stop reading as zero.
For SME traps taken with ESR_ELx.EC == 0b011101, the specific reason for
the trap is indicated by ESR_ELx.ISS.SMTC ("SME Trap Code"). This field
occupies bits [2:0] of ESR_ELx.ISS, and as of ARM DDI 0487 L.a, bits
[24:3] of ESR_ELx.ISS are RES0. ESR_ELx.ISS itself occupies bits [24:0]
of ESR_ELx.
Extract the SMTC field specifically, matching the way we handle ESR_ELx
fields elsewhere, and ensuring that the handler is future-proof.
Fixes: 8bd7f91c03 ("arm64/sme: Implement traps and syscall handling for SME")
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250409164010.3480271-2-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Merge series from Bartosz Golaszewski <brgl@bgdev.pl>:
Handling of shared GPIOs in the kernel needs some improvements. Let's
start with a simple change of not comparing GPIO descriptor pointers
directly as there's nothing that guarantees that the same physical pin
will always be represented by a single GPIO descriptor obtained by
calling gpiod_get().
The following causes a vsnprintf fault:
# echo 's:wake_lat char[] wakee; u64 delta;' >> /sys/kernel/tracing/dynamic_events
# echo 'hist:keys=pid:ts=common_timestamp.usecs if !(common_flags & 0x18)' > /sys/kernel/tracing/events/sched/sched_waking/trigger
# echo 'hist:keys=next_pid:delta=common_timestamp.usecs-$ts:onmatch(sched.sched_waking).trace(wake_lat,next_comm,$delta)' > /sys/kernel/tracing/events/sched/sched_switch/trigger
Because the synthetic event's "wakee" field is created as a dynamic string
(even though the string copied is not). The print format to print the
dynamic string changed from "%*s" to "%s" because another location
(__set_synth_event_print_fmt()) exported this to user space, and user
space did not need that. But it is still used in print_synth_event(), and
the output looks like:
<idle>-0 [001] d..5. 193.428167: wake_lat: wakee=(efault)sshd-sessiondelta=155
sshd-session-879 [001] d..5. 193.811080: wake_lat: wakee=(efault)kworker/u34:5delta=58
<idle>-0 [002] d..5. 193.811198: wake_lat: wakee=(efault)bashdelta=91
bash-880 [002] d..5. 193.811371: wake_lat: wakee=(efault)kworker/u35:2delta=21
<idle>-0 [001] d..5. 193.811516: wake_lat: wakee=(efault)sshd-sessiondelta=129
sshd-session-879 [001] d..5. 193.967576: wake_lat: wakee=(efault)kworker/u34:5delta=50
The length isn't needed as the string is always nul terminated. Just print
the string and not add the length (which was hard coded to the max string
length anyway).
Cc: stable@vger.kernel.org
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Tom Zanussi <zanussi@kernel.org>
Cc: Douglas Raillard <douglas.raillard@arm.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Link: https://lore.kernel.org/20250407154139.69955768@gandalf.local.home
Fixes: 4d38328eb4 ("tracing: Fix synth event printk format for str fields");
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
When building with W=1, this variable is unused for configs with
CONFIG_CMA_SIZE_SEL_PERCENTAGE=y:
kernel/dma/contiguous.c:67:26: error: 'size_bytes' defined but not used [-Werror=unused-const-variable=]
Change this to a macro to avoid the warning.
Fixes: c64be2bb1c ("drivers: add Contiguous Memory Allocator")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20250409151557.3890443-1-arnd@kernel.org
Add a set of tests for gpio-aggregator module. This test covers both
pre-existing new_device/delete_device interface and new configfs-based
interface.
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Link: https://lore.kernel.org/r/20250407043019.4105613-10-koichiro.den@canonical.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
For aggregators initialized via configfs, write 1 to 'live' waits for
probe completion and returns an error if the probe fails, unlike the
legacy sysfs interface, which is asynchronous.
Since users control the liveness of the aggregator device and might be
editing configurations while 'live' is 0, deferred probing is both
unnatural and unsafe.
Cancel deferred probe for purely configfs-based aggregators when probe
fails.
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Link: https://lore.kernel.org/r/20250407043019.4105613-8-koichiro.den@canonical.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Expose settings for aggregators created using the sysfs 'new_device'
interface to configfs. Once written to 'new_device', an "_sysfs.<N>" path
appears in the configfs regardless of whether the probe succeeds.
Consequently, users can no longer use that prefix for custom GPIO
aggregator names. The 'live' attribute changes to 1 when the probe
succeeds and the GPIO forwarder is instantiated.
Note that the aggregator device created via sysfs is asynchronous, i.e.
writing into 'new_device' returns without waiting for probe completion,
and the probe may succeed, fail, or eventually succeed via deferred
probe. Thus, the 'live' attribute may change from 0 to 1 asynchronously
without notice. So, editing key/offset/name while it's waiting for
deferred probe is prohibited.
The configfs auto-generation relies on create_default_group(), which
inherently prohibits rmdir(2). To align with the limitation, this commit
also prohibits mkdir(2) for them. When users want to change the number
of lines for an aggregator initialized via 'new_device', they need to
tear down the device using 'delete_device' and reconfigure it from
scratch. This does not break previous behavior; users of legacy sysfs
interface simply gain additional almost read-only configfs exposure.
Still, users can write to the 'live' attribute to toggle the device
unless it's waiting for deferred probe. So once probe succeeds, they can
deactivate it in the same manner as the devices initialized via
configfs.
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Link: https://lore.kernel.org/r/20250407043019.4105613-7-koichiro.den@canonical.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Rename the local variable 'name' in gpio_aggregator_parse() to 'key'
because struct gpio_aggregator_line now uses the 'name' field for the
custom line name and the local variable actually represents a 'key'.
This change prepares for the next but one commit.
No functional change.
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Link: https://lore.kernel.org/r/20250407043019.4105613-6-koichiro.den@canonical.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
The existing sysfs 'new_device' interface has several limitations:
* No way to determine when GPIO aggregator creation is complete.
* No way to retrieve errors when creating a GPIO aggregator.
* No way to trace a GPIO line of an aggregator back to its
corresponding physical device.
* The 'new_device' echo does not indicate which virtual gpiochip<N>
was created.
* No way to assign names to GPIO lines exported through an aggregator.
Introduce the new configfs interface for gpio-aggregator to address
these limitations. It provides a more streamlined, modern, and
extensible configuration method. For backward compatibility, the
'new_device' interface and its behavior is retained for now.
This commit implements basic functionalities:
/config/gpio-aggregator/<name-of-your-choice>/
/config/gpio-aggregator/<name-of-your-choice>/live
/config/gpio-aggregator/<name-of-your-choice>/dev_name
/config/gpio-aggregator/<name-of-your-choice>/<lineY>/
/config/gpio-aggregator/<name-of-your-choice>/<lineY>/key
/config/gpio-aggregator/<name-of-your-choice>/<lineY>/offset
/config/gpio-aggregator/<name-of-your-choice>/<lineY>/name
Basic setup flow is:
1. Create a directory for a GPIO aggregator.
2. Create subdirectories for each line you want to instantiate.
3. In each line directory, configure the key and offset.
The key/offset semantics are as follows:
* If offset is >= 0:
- key specifies the name of the chip this GPIO belongs to
- offset specifies the line offset within that chip.
* If offset is <0:
- key needs to specify the GPIO line name.
4. Return to the aggregator's root directory and write '1' to the live
attribute.
For example, the command in the existing kernel doc:
echo 'e6052000.gpio 19 e6050000.gpio 20-21' > new_device
is equivalent to:
mkdir /sys/kernel/config/gpio-aggregator/<custom-name>
# Change <custom-name> to name of your choice (e.g. "aggr0")
cd /sys/kernel/config/gpio-aggregator/<custom-name>
mkdir line0 line1 line2 # Only "line<Y>" naming allowed.
echo e6052000.gpio > line0/key
echo 19 > line0/offset
echo e6050000.gpio > line1/key
echo 20 > line1/offset
echo e6050000.gpio > line2/key
echo 21 > line2/offset
echo 1 > live
The corresponding gpio_device id can be identified as follows:
cd /sys/kernel/config/gpio-aggregator/<custom-name>
ls -d /sys/devices/platform/`cat dev_name`/gpiochip*
Also, via configfs, custom GPIO line name can be set like this:
cd /sys/kernel/config/gpio-aggregator/<custom-name>
echo "abc" > line1/name
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Link: https://lore.kernel.org/r/20250407043019.4105613-5-koichiro.den@canonical.com
[Bartosz: remove stray newlines]
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
The NULL array terminator at the end of erratum_1386_microcode was
removed during the switch from x86_cpu_desc to x86_cpu_id. This
causes readers to run off the end of the array.
Replace the NULL.
Fixes: f3f3251526 ("x86/cpu: Move AMD erratum 1386 table over to 'x86_cpu_id'")
Reported-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
- The MSB 32 bits of `z_fragmentoff` are available only in extent
records of size >= 8B.
- Use round_down() to calculate `lstart` as well as increase `pos`
correspondingly for extent records of size == 8B.
Fixes: 1d191b4ca5 ("erofs: implement encoded extent metadata")
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20250408114448.4040220-2-hsiangkao@linux.alibaba.com
If a file-backed IO fails before submitting the bio to the lower
filesystem, an error is returned, but the bio->bi_status is not
marked as an error. However, the error information should be passed
to the end_io handler. Otherwise, the IO request will be treated as
successful.
Fixes: 283213718f ("erofs: support compressed inodes for fileio")
Signed-off-by: Sheng Yong <shengyong1@xiaomi.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20250408122351.2104507-1-shengyong1@xiaomi.com
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Don't fetch it again if we already have it. It seems the
registers don't reliably have the value at resume in some
cases.
Fixes: 785f0f9fe7 ("drm/amdgpu: Add mes v12_0 ip block support (v4)")
Reviewed-by: Shaoyun.liu <Shaoyun.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 9e7b08d239)
Cc: stable@vger.kernel.org # 6.12.x
The user can set any speed value.
If speed is greater than UINT_MAX/8, division by zero is possible.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: 1e866f1fe5 ("drm/amd/pm: Prevent divide by zero")
Signed-off-by: Denis Arefev <arefev@swemel.ru>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit da7dc714a8)
Cc: stable@vger.kernel.org
This is normally handled in the gfx IP suspend callbacks, but
for S0ix, those are skipped because we don't want to touch
gfx. So handle it in device suspend.
Fixes: b9467983b7 ("drm/amdgpu: add dynamic workload profile switching for gfx10")
Fixes: 963537ca23 ("drm/amdgpu: add dynamic workload profile switching for gfx11")
Fixes: 5f95a15495 ("drm/amdgpu: add dynamic workload profile switching for gfx12")
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 906ad45167)
Cc: stable@vger.kernel.org
Pause the workload setting in dm when doing idle optimization
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit b23f81c442)
Add the callback for implementation for swsmu.
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 92e511d1ce)
To be used for display idle optimizations when
we want to pause non-default profiles.
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 6dafb5d4c7)
