In case of parallel submissions multiple GuC id will point to the
same exec queue and on GT reset such exec queues will get restarted
multiple times which is not desirable.
v2: don't use exec_queue_enabled() which could race,
do the same for xe_guc_submit_stop (Matt B)
Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2295
Cc: Jonathan Cavitt <jonathan.cavitt@intel.com>
Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Tejas Upadhyay <tejas.upadhyay@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241022103555.731557-1-nirmoy.das@intel.com
Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
(cherry picked from commit c8b0acd6d8)
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
access_ok() only checks for addr overflow so also try to read the addr
to catch invalid addr sent from userspace.
Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/1630
Cc: Francois Dugast <francois.dugast@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241016082304.66009-2-nirmoy.das@intel.com
Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
(cherry picked from commit 9408c45084)
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
In some cases, when the driver attempts to read an MMIO register,
the hardware may return 0xFFFFFFFF. The current force wake path
code treats this as a valid response, as it only checks the BIT.
However, 0xFFFFFFFF should be considered an invalid value, indicating
a potential issue. To address this, we should add a log entry to
highlight this condition and return failure.
The force wake failure log level is changed from notice to err
to match the failure return value.
v2 (Matt Brost):
- set ret value (-EIO) to kick the error to upper layers
v3 (Rodrigo):
- add commit message for the log level promotion from notice to err
v4:
- update reviewed info
Suggested-by: Alex Zuo <alex.zuo@intel.com>
Signed-off-by: Shuicheng Lin <shuicheng.lin@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Acked-by: Badal Nilawar <badal.nilawar@intel.com>
Cc: Anshuman Gupta <anshuman.gupta@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241017221547.1564029-1-shuicheng.lin@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
(cherry picked from commit a9fbeabe72)
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
In case if g2h worker doesn't get opportunity to within specified
timeout delay then flush the g2h worker explicitly.
v2:
- Describe change in the comment and add TODO (Matt B/John H)
- Add xe_gt_warn on fence done after G2H flush (John H)
v3:
- Updated the comment with root cause
- Clean up xe_gt_warn message (John H)
Closes: https://gitlab.freedesktop.org/drm/xe/kernel/issues/1620
Closes: https://gitlab.freedesktop.org/drm/xe/kernel/issues/2902
Signed-off-by: Badal Nilawar <badal.nilawar@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Acked-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241017111410.2553784-2-badal.nilawar@intel.com
(cherry picked from commit e515272338)
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
There are error messages like below that are occurring during stress
testing: "[ 31.004009] xe 0000:03:00.0: [drm] ERROR GT0: Global
invalidation timeout". Previously it was hitting this 3 out of 1000
executions of warm reboot. After raising it to 500, 1000 warm reboot
executions passed and it didn't fail.
Due to the way xe_mmio_wait32() is implemented, the timeout is able to
expire early when the register matches the expected value due to the
wait increments starting small. So, the larger timeout value should have
no effect during normal use cases.
v2 (Jonathan):
- rework the commit message
v3 (Lucas):
- add conclusive message for the fail rate and test case
v4:
- add suggested-by
Suggested-by: Jia Yao <jia.yao@intel.com>
Signed-off-by: Shuicheng Lin <shuicheng.lin@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Nirmoy Das <nirmoy.das@intel.com>
Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Tested-by: Zongyao Bai <zongyao.bai@intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241015161207.1373401-1-shuicheng.lin@intel.com
(cherry picked from commit 2eb460ab9f)
[ Fix conflict with gt->mmio ]
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
The fifth PCIe controller is connected to the PCIe North ANoC.
Fix the corresponding interconnect property so that the OS manages the
right path.
Fixes: 62ab23e155 ("arm64: dts: qcom: x1e80100: add PCIe5 nodes")
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20241024131101.13587-3-johan+linaro@kernel.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
The fourth PCIe controller is connected to the PCIe North ANoC.
Fix the corresponding interconnect property so that the OS manages the
right path.
Fixes: 5eb83fc102 ("arm64: dts: qcom: x1e80100: Add PCIe nodes")
Cc: stable@vger.kernel.org # 6.9
Cc: Abel Vesa <abel.vesa@linaro.org>
Cc: Sibi Sankar <quic_sibis@quicinc.com>
Cc: Rajendra Nayak <quic_rjendra@quicinc.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20241024131101.13587-2-johan+linaro@kernel.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
In the ad7124_write_raw() function, parameter val can potentially
be zero. This may lead to a division by zero when DIV_ROUND_CLOSEST()
is called within ad7124_set_channel_odr(). The ad7124_write_raw()
function is invoked through the sequence: iio_write_channel_raw() ->
iio_write_channel_attribute() -> iio_channel_write(), with no checks
in place to ensure val is non-zero.
Cc: stable@vger.kernel.org
Fixes: 7b8d045e49 ("iio: adc: ad7124: allow more than 8 channels")
Signed-off-by: Zicheng Qu <quzicheng@huawei.com>
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Link: https://patch.msgid.link/20241022134330.574601-1-quzicheng@huawei.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
In the ad9832_write_frequency() function, clk_get_rate() might return 0.
This can lead to a division by zero when calling ad9832_calc_freqreg().
The check if (fout > (clk_get_rate(st->mclk) / 2)) does not protect
against the case when fout is 0. The ad9832_write_frequency() function
is called from ad9832_write(), and fout is derived from a text buffer,
which can contain any value.
Link: https://lore.kernel.org/all/2024100904-CVE-2024-47663-9bdc@gregkh/
Fixes: ea707584ba ("Staging: IIO: DDS: AD9832 / AD9835 driver")
Cc: stable@vger.kernel.org
Signed-off-by: Zicheng Qu <quzicheng@huawei.com>
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://patch.msgid.link/20241022134354.574614-1-quzicheng@huawei.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
ad7380-4 is the only device from ad738x family that doesn't have an
internal reference. Moreover it's external reference is called REFIN in
the datasheet while all other use REFIO as an optional external
reference. Update documentation to highlight this.
Fixes: 3e82dfc82f ("docs: iio: new docs for ad7380 driver")
Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Julien Stephan <jstephan@baylibre.com>
Link: https://patch.msgid.link/20241022-ad7380-fix-supplies-v3-5-f0cefe1b7fa6@baylibre.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
ad7380-4 is the only device in the family that does not have an internal
reference. It uses "refin" as a required external reference.
All other devices in the family use "refio"" as an optional external
reference.
Fixes: 737413da87 ("iio: adc: ad7380: add support for ad738x-4 4 channels variants")
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Julien Stephan <jstephan@baylibre.com>
Link: https://patch.msgid.link/20241022-ad7380-fix-supplies-v3-4-f0cefe1b7fa6@baylibre.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
vcc and vlogic are required but are not retrieved and enabled in the
probe. Add them.
In order to prepare support for additional parts requiring different
supplies, add vcc and vlogic to the platform specific structures
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Julien Stephan <jstephan@baylibre.com>
Link: https://patch.msgid.link/20241022-ad7380-fix-supplies-v3-3-f0cefe1b7fa6@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Use devm_regulator_get_enable_read_voltage() to simplify the code.
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Julien Stephan <jstephan@baylibre.com>
Link: https://patch.msgid.link/20241022-ad7380-fix-supplies-v3-2-f0cefe1b7fa6@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
ad7380-4 is the only device from ad738x family that doesn't have an
internal reference. Moreover its external reference is called REFIN in
the datasheet while all other use REFIO as an optional external
reference. If refio-supply is omitted the internal reference is
used.
Fix the binding by adding refin-supply and makes it required for
ad7380-4 only.
Fixes: 1a291cc8ee ("dt-bindings: iio: adc: ad7380: add support for ad738x-4 4 channels variants")
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Julien Stephan <jstephan@baylibre.com>
Link: https://patch.msgid.link/20241022-ad7380-fix-supplies-v3-1-f0cefe1b7fa6@baylibre.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
The raw value conversion to obtain a measurement in lux as
INT_PLUS_MICRO does not calculate the decimal part properly to display
it as micro (in this case microlux). It only calculates the module to
obtain the decimal part from a resolution that is 10000 times the
provided in the datasheet (0.5376 lux/cnt for the veml6030). The
resulting value must still be multiplied by 100 to make it micro.
This bug was introduced with the original implementation of the driver.
Only the illuminance channel is fixed becuase the scale is non sensical
for the intensity channels anyway.
Cc: stable@vger.kernel.org
Fixes: 7b779f573c ("iio: light: add driver for veml6030 ambient light sensor")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://patch.msgid.link/20241016-veml6030-fix-processed-micro-v1-1-4a5644796437@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Martin KaFai Lau says:
====================
Share user memory to BPF program through task storage map
From: Martin KaFai Lau <martin.lau@kernel.org>
It is the v6 of this series. Starting from v5, it is a continuation work
of the RFC v4.
Changes in v6:
1. In patch 1, reject t->size == 0 in btf_check_and_fixup_fields.
Reject a uptr pointing to an empty struct.
A test is added to patch 12 to test this case.
2. In patch 6, when checking if the uptr struct spans across
pages, there was an off by one error in calculating the "end" such
that the uptr will be rejected by error if the object is located
exactly at the end of a page.
This is fixed by adding t->size "- 1" to "start".
A test is added to patch 9 to test this case.
3. In patch 6, check for PageHighMem(page) and return -EOPNOTSUPP.
The 32 bit arch jit is missing other crucial bpf features (e.g. kfunc).
Patch 6 commit message has been updated to include this change.
4. The selftests are cleaned up such that "struct user_data *dummy_data"
global ptr is used instead of the whole "struct user_data dummy_data"
object. Still a hack to avoid generating fwd btf type for the
uptr struct but somewhat lighter than a full blown global object.
Changes in v5:
1. The original patch 1 and patch 2 are combined.
2. Patch 3, 4, and 5 are new. They get the bpf_local_storage
ready to handle the __uptr in the map_value.
3. Patch 6 is mostly new, so I reset the sob.
4. There are some changes in the carry over patch 1 and 2 also. They
are mentioned at the individual patch.
5. More tests are added.
The following is the original cover letter and the earlier change log.
The bpf prog example has been removed. Please find a similar
example in the selftests task_ls_uptr.c.
~~~~~~~~
Some of BPF schedulers (sched_ext) need hints from user programs to do
a better job. For example, a scheduler can handle a task in a
different way if it knows a task is doing GC. So, we need an efficient
way to share the information between user programs and BPF
programs. Sharing memory between user programs and BPF programs is
what this patchset does.
== REQUIREMENT ==
This patchset enables every task in every process to share a small
chunk of memory of it's own with a BPF scheduler. So, they can update
the hints without expensive overhead of syscalls. It also wants every
task sees only the data/memory belong to the task/or the task's
process.
== DESIGN ==
This patchset enables BPF prorams to embed __uptr; uptr in the values
of task storage maps. A uptr field can only be set by user programs by
updating map element value through a syscall. A uptr points to a block
of memory allocated by the user program updating the element
value. The memory will be pinned to ensure it staying in the core
memory and to avoid a page fault when the BPF program accesses it.
Please see the selftests task_ls_uptr.c for an example.
== MEMORY ==
In order to use memory efficiently, we don't want to pin a large
number of pages. To archieve that, user programs should collect the
memory blocks pointed by uptrs together to share memory pages if
possible. It avoid the situation that pin one page for each thread in
a process. Instead, we can have several threads pointing their uptrs
to the same page but with different offsets.
Although it is not necessary, avoiding the memory pointed by an uptr
crossing the boundary of a page can prevent an additional mapping in
the kernel address space.
== RESTRICT ==
The memory pointed by a uptr should reside in one memory
page. Crossing multi-pages is not supported at the moment.
Only task storage map have been supported at the moment.
The values of uptrs can only be updated by user programs through
syscalls.
bpf_map_lookup_elem() from userspace returns zeroed values for uptrs
to prevent leaking information of the kernel.
---
Changes from v3:
- Merge part 4 and 5 as the new part 4 in order to cease the warning
of unused functions from CI.
Changes from v1:
- Rename BPF_KPTR_USER to BPF_UPTR.
- Restrict uptr to one page.
- Mark uptr with PTR_TO_MEM | PTR_MAY_BE_NULL and with the size of
the target type.
- Move uptr away from bpf_obj_memcpy() by introducing
bpf_obj_uptrcpy() and copy_map_uptr_locked().
- Remove the BPF_FROM_USER flag.
- Align the meory pointed by an uptr in the test case. Remove the
uptr of mmapped memory.
Kui-Feng Lee (4):
bpf: Support __uptr type tag in BTF
bpf: Handle BPF_UPTR in verifier
libbpf: define __uptr.
selftests/bpf: Some basic __uptr tests
====================
Link: https://lore.kernel.org/r/20241023234759.860539-1-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This patch tests the map creation failure when the map_value
has unsupported uptr. The three cases are the struct is larger
than one page, the struct is empty, and the struct is a kernel struct.
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20241023234759.860539-13-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This patch test the following failures in syscall update_elem
1. The first update_elem(BPF_F_LOCK) should be EOPNOTSUPP. syscall.c takes
care of unpinning the uptr.
2. The second update_elem(BPF_EXIST) fails. syscall.c takes care of
unpinning the uptr.
3. The forth update_elem(BPF_NOEXIST) fails. bpf_local_storage_update
takes care of unpinning the uptr.
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20241023234759.860539-11-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This patch tests the case when uptr has a struct spanning across two
pages. It is not supported now and EOPNOTSUPP is expected from the
syscall update_elem.
It also tests the whole uptr struct located exactly at the
end of a page and ensures that this case is accepted by update_elem.
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20241023234759.860539-10-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Make sure the memory of uptrs have been mapped to the kernel properly.
Also ensure the values of uptrs in the kernel haven't been copied
to userspace.
It also has the syscall update_elem/delete_elem test to test the
pin/unpin code paths.
Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20241023234759.860539-9-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Make __uptr available to BPF programs to enable them to define uptrs.
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20241023234759.860539-8-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This patch adds uptr support in the map_value of the task local storage.
struct map_value {
struct user_data __uptr *uptr;
};
struct {
__uint(type, BPF_MAP_TYPE_TASK_STORAGE);
__uint(map_flags, BPF_F_NO_PREALLOC);
__type(key, int);
__type(value, struct value_type);
} datamap SEC(".maps");
A new bpf_obj_pin_uptrs() is added to pin the user page and
also stores the kernel address back to the uptr for the
bpf prog to use later. It currently does not support
the uptr pointing to a user struct across two pages.
It also excludes PageHighMem support to keep it simple.
As of now, the 32bit bpf jit is missing other more crucial bpf
features. For example, many important bpf features depend on
bpf kfunc now but so far only one arch (x86-32) supports it
which was added by me as an example when kfunc was first
introduced to bpf.
The uptr can only be stored to the task local storage by the
syscall update_elem. Meaning the uptr will not be considered
if it is provided by the bpf prog through
bpf_task_storage_get(BPF_LOCAL_STORAGE_GET_F_CREATE).
This is enforced by only calling
bpf_local_storage_update(swap_uptrs==true) in
bpf_pid_task_storage_update_elem. Everywhere else will
have swap_uptrs==false.
This will pump down to bpf_selem_alloc(swap_uptrs==true). It is
the only case that bpf_selem_alloc() will take the uptr value when
updating the newly allocated selem. bpf_obj_swap_uptrs() is added
to swap the uptr between the SDATA(selem)->data and the user provided
map_value in "void *value". bpf_obj_swap_uptrs() makes the
SDATA(selem)->data takes the ownership of the uptr and the user space
provided map_value will have NULL in the uptr.
The bpf_obj_unpin_uptrs() is called after map->ops->map_update_elem()
returning error. If the map->ops->map_update_elem has reached
a state that the local storage has taken the uptr ownership,
the bpf_obj_unpin_uptrs() will be a no op because the uptr
is NULL. A "__"bpf_obj_unpin_uptrs is added to make this
error path unpin easier such that it does not have to check
the map->record is NULL or not.
BPF_F_LOCK is not supported when the map_value has uptr.
This can be revisited later if there is a use case. A similar
swap_uptrs idea can be considered.
The final bit is to do unpin_user_page in the bpf_obj_free_fields().
The earlier patch has ensured that the bpf_obj_free_fields() has
gone through the rcu gp when needed.
Cc: linux-mm@kvack.org
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
Link: https://lore.kernel.org/r/20241023234759.860539-7-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
A later patch will enable the uptr usage in the task_local_storage map.
This will require the unpin_user_page() to be done after the rcu
task trace gp for the cases that the uptr may still be used by
a bpf prog. The bpf_obj_free_fields() will be the one doing
unpin_user_page(), so this patch is to postpone calling
bpf_obj_free_fields() to the rcu callback.
The bpf_obj_free_fields() is only required to be done in
the rcu callback when bpf->bpf_ma==true and reuse_now==false.
bpf->bpf_ma==true case is because uptr will only be enabled
in task storage which has already been moved to bpf_mem_alloc.
The bpf->bpf_ma==false case can be supported in the future
also if there is a need.
reuse_now==false when the selem (aka storage) is deleted
by bpf prog (bpf_task_storage_delete) or by syscall delete_elem().
In both cases, bpf_obj_free_fields() needs to wait for
rcu gp.
A few words on reuse_now==true. reuse_now==true when the
storage's owner (i.e. the task_struct) is destructing or the map
itself is doing map_free(). In both cases, no bpf prog should
have a hold on the selem and its uptrs, so there is no need to
postpone bpf_obj_free_fields(). reuse_now==true should be the
common case for local storage usage where the storage exists
throughout the lifetime of its owner (task_struct).
The bpf_obj_free_fields() needs to use the map->record. Doing
bpf_obj_free_fields() in a rcu callback will require the
bpf_local_storage_map_free() to wait for rcu_barrier. An optimization
could be only waiting for rcu_barrier when the map has uptr in
its map_value. This will require either yet another rcu callback
function or adding a bool in the selem to flag if the SDATA(selem)->smap
is still valid. This patch chooses to keep it simple and wait for
rcu_barrier for maps that use bpf_mem_alloc.
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20241023234759.860539-6-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
In a later patch, bpf_selem_free() will call unpin_user_page()
through bpf_obj_free_fields(). unpin_user_page() may take spin_lock.
However, some bpf_selem_free() call paths have held a raw_spin_lock.
Like this:
raw_spin_lock_irqsave()
bpf_selem_unlink_storage_nolock()
bpf_selem_free()
unpin_user_page()
spin_lock()
To avoid spinlock nested in raw_spinlock, bpf_selem_free() should be
done after releasing the raw_spinlock. The "bool reuse_now" arg is
replaced with "struct hlist_head *free_selem_list" in
bpf_selem_unlink_storage_nolock(). The bpf_selem_unlink_storage_nolock()
will append the to-be-free selem at the free_selem_list. The caller of
bpf_selem_unlink_storage_nolock() will need to call the new
bpf_selem_free_list(free_selem_list, reuse_now) to free the selem
after releasing the raw_spinlock.
Note that the selem->snode cannot be reused for linking to
the free_selem_list because the selem->snode is protected by the
raw_spinlock that we want to avoid holding. A new
"struct hlist_node free_node;" is union-ized with
the rcu_head. Only the first one successfully
hlist_del_init_rcu(&selem->snode) will be able
to use the free_node. After succeeding hlist_del_init_rcu(&selem->snode),
the free_node and rcu_head usage is serialized such that they
can share the 16 bytes in a union.
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20241023234759.860539-5-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
In a later patch, the task local storage will only accept uptr
from the syscall update_elem and will not accept uptr from
the bpf prog. The reason is the bpf prog does not have a way
to provide a valid user space address.
bpf_local_storage_update() and bpf_selem_alloc() are used by
both bpf prog bpf_task_storage_get(BPF_LOCAL_STORAGE_GET_F_CREATE)
and bpf syscall update_elem. "bool swap_uptrs" arg is added
to bpf_local_storage_update() and bpf_selem_alloc() to tell if
it is called by the bpf prog or by the bpf syscall. When
swap_uptrs==true, it is called by the syscall.
The arg is named (swap_)uptrs because the later patch will swap
the uptrs between the newly allocated selem and the user space
provided map_value. It will make error handling easier in case
map->ops->map_update_elem() fails and the caller can decide
if it needs to unpin the uptr in the user space provided
map_value or the bpf_local_storage_update() has already
taken the uptr ownership and will take care of unpinning it also.
Only swap_uptrs==false is passed now. The logic to handle
the true case will be added in a later patch.
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20241023234759.860539-4-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This patch adds BPF_UPTR support to the verifier. Not that only the
map_value will support the "__uptr" type tag.
This patch enforces only BPF_LDX is allowed to the value of an uptr.
After BPF_LDX, it will mark the dst_reg as PTR_TO_MEM | PTR_MAYBE_NULL
with size deduced from the field.kptr.btf_id. This will make the
dst_reg pointed memory to be readable and writable as scalar.
There is a redundant "val_reg = reg_state(env, value_regno);" statement
in the check_map_kptr_access(). This patch takes this chance to remove
it also.
Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20241023234759.860539-3-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This patch introduces the "__uptr" type tag to BTF. It is to define
a pointer pointing to the user space memory. This patch adds BTF
logic to pass the "__uptr" type tag.
btf_find_kptr() is reused for the "__uptr" tag. The "__uptr" will only
be supported in the map_value of the task storage map. However,
btf_parse_struct_meta() also uses btf_find_kptr() but it is not
interested in "__uptr". This patch adds a "field_mask" argument
to btf_find_kptr() which will return BTF_FIELD_IGNORE if the
caller is not interested in a “__uptr” field.
btf_parse_kptr() is also reused to parse the uptr.
The btf_check_and_fixup_fields() is changed to do extra
checks on the uptr to ensure that its struct size is not larger
than PAGE_SIZE. It is not clear how a uptr pointing to a CO-RE
supported kernel struct will be used, so it is also not allowed now.
Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20241023234759.860539-2-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Define the sdr104-specific offsets, preventing the driver from
defaulting to the 1.8V offsets, which cause the system to hang during
the SDR104 mode calibration.
The zeroing of these values was chosen since it restores functionality
and no better suggestions are provided by the Tegra X1 TRM.
Signed-off-by: Diogo Ivo <diogo.ivo@tecnico.ulisboa.pt>
Signed-off-by: Thierry Reding <treding@nvidia.com>
The dtschema requires to specify common ancestor which all SDIO chips are
derived from, so add accordingly.
Fixes: a50d5dcd28 ("arm64: tegra: Wire up WiFi on Jetson TX1 module")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202409030438.8tumAnp1-lkp@intel.com
Signed-off-by: Tomasz Maciej Nowak <tmn505@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Hou Tao says:
====================
Add the missing BPF_LINK_TYPE invocation for sockmap
From: Hou Tao <houtao1@huawei.com>
Hi,
The tiny patch set fixes the out-of-bound read problem when reading the
fdinfo of sock map link fd. And in order to spot such omission early for
the newly-added link type in the future, it also checks the validity of
the link->type and adds a WARN_ONCE() for missed invocation.
Please see individual patches for more details. And comments are always
welcome.
v3:
* patch #2: check and warn the validity of link->type instead of
adding a static assertion for bpf_link_type_strs array.
v2: http://lore.kernel.org/bpf/d49fa2f4-f743-c763-7579-c3cab4dd88cb@huaweicloud.com
====================
Link: https://lore.kernel.org/r/20241024013558.1135167-1-houtao@huaweicloud.com
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
If a newly-added link type doesn't invoke BPF_LINK_TYPE(), accessing
bpf_link_type_strs[link->type] may result in an out-of-bounds access.
To spot such missed invocations early in the future, checking the
validity of link->type in bpf_link_show_fdinfo() and emitting a warning
when such invocations are missed.
Signed-off-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20241024013558.1135167-3-houtao@huaweicloud.com
There is an out-of-bounds read in bpf_link_show_fdinfo() for the sockmap
link fd. Fix it by adding the missing BPF_LINK_TYPE invocation for
sockmap link
Also add comments for bpf_link_type to prevent missing updates in the
future.
Fixes: 699c23f02c ("bpf: Add bpf_link support for sk_msg and sk_skb progs")
Signed-off-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20241024013558.1135167-2-houtao@huaweicloud.com
We lack find_symbol() selftests, so add one. This let's us stress test
improvements easily on find_symbol() or optimizations. It also inherently
allows us to test the limits of kallsyms on Linux today.
We test a pathalogical use case for kallsyms by introducing modules
which are automatically written for us with a larger number of symbols.
We have 4 kallsyms test modules:
A: has KALLSYSMS_NUMSYMS exported symbols
B: uses one of A's symbols
C: adds KALLSYMS_SCALE_FACTOR * KALLSYSMS_NUMSYMS exported
D: adds 2 * the symbols than C
By using anything much larger than KALLSYSMS_NUMSYMS as 10,000 and
KALLSYMS_SCALE_FACTOR of 8 we segfault today. So we're capped at
around 160000 symbols somehow today. We can inpsect that issue at
our leasure later, but for now the real value to this test is that
this will easily allow us to test improvements on find_symbol().
We want to enable this test on allyesmodconfig builds so we can't
use this combination, so instead just use a safe value for now and
be informative on the Kconfig symbol documentation about where our
thresholds are for testers. We default then to KALLSYSMS_NUMSYMS of
just 100 and KALLSYMS_SCALE_FACTOR of 8.
On x86_64 we can use perf, for other architectures we just use 'time'
and allow for customizations. For example a future enhancements could
be done for parisc to check for unaligned accesses which triggers a
special special exception handler assembler code inside the kernel.
The negative impact on performance is so large on parisc that it
keeps track of its accesses on /proc/cpuinfo as UAH:
IRQ: CPU0 CPU1
3: 1332 0 SuperIO ttyS0
7: 1270013 0 SuperIO pata_ns87415
64: 320023012 320021431 CPU timer
65: 17080507 20624423 CPU IPI
UAH: 10948640 58104 Unaligned access handler traps
While at it, this tidies up lib/ test modules to allow us to have
a new directory for them. The amount of test modules under lib/
is insane.
This should also hopefully showcase how to start doing basic
self module writing code, which may be more useful for more complex
cases later in the future.
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
ops.dispatch() and ops.yield() may be fed a NULL task_struct pointer.
set_arg_maybe_null() is used to tell the verifier that they should be NULL
checked before being dereferenced. BPF now has an a lot prettier way to
express this - tagging arguments in CFI stubs with __nullable. Replace
set_arg_maybe_null() with __nullable CFI stub tags.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: David Vernet <void@manifault.com>
Acked-by: Martin KaFai Lau <martin.lau@kernel.org>
Acked-by: Alexei Starovoitov <ast@kernel.org>
CFI stubs can be used to tag arguments with __nullable (and possibly other
tags in the future) but for that to work the CFI stubs must have names that
are recognized by BPF. Rename them.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: David Vernet <void@manifault.com>
Acked-by: Martin KaFai Lau <martin.lau@kernel.org>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Fix incompatible function pointer type warnings in sched_ext BPF selftests by
explicitly casting the function pointers when initializing struct_ops.
This addresses multiple -Wincompatible-function-pointer-types warnings from the
clang compiler where function signatures didn't match exactly.
The void * cast ensures the compiler accepts the function pointer
assignment despite minor type differences in the parameters.
Signed-off-by: Vishal Chourasia <vishalc@linux.ibm.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
The iommu_paging_domain_alloc() function doesn't return NULL pointers,
it returns error pointers. Update the check to match.
Fixes: 45c690aea8 ("drm/tegra: Use iommu_paging_domain_alloc()")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/ba31cf3a-af3d-4ff1-87a8-f05aaf8c780b@stanley.mountain
This reverts commit 8812b8689e ("firmware: tegra: bpmp: Use scoped
device node handling to simplify error paths") because it was silently
modified by committer during commit process, by moving declaration of
'struct device_node *np' above the initializer/constructor. Such code
was not intention of the author, is not conforming to cleanup.h code
style and decreases the code readability.
I did not write such code and I did not agree to put my name with such
commit.
Original patch:
https://lore.kernel.org/all/20240816135722.105945-2-krzysztof.kozlowski@linaro.org/
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
[treding@nvidia.com: shorten subject line]
Signed-off-by: Thierry Reding <treding@nvidia.com>
Update the `Opaque` documentation and add an example as proposed by
Miguel Ojeda in [1]. The documentation update is mainly taken from
Benno Lossin's description [2].
Cc: Nell Shamrell-Harrington <nells@linux.microsoft.com>
Suggested-by: Miguel Ojeda <ojeda@kernel.org>
Link: https://rust-for-linux.zulipchat.com/#narrow/stream/291565/topic/x/near/467478085 [1]
Link: https://rust-for-linux.zulipchat.com/#narrow/stream/291565/topic/x/near/470498289 [2]
Co-developed-by: Benno Lossin <benno.lossin@proton.me>
Signed-off-by: Benno Lossin <benno.lossin@proton.me>
Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Link: https://lore.kernel.org/r/20241002050301.1927545-1-dirk.behme@de.bosch.com
[ Used `expect`. Rewrapped docs. Added intra-doc link. Formatted
example. Reworded to fix tag typo/order. Fixed `&mut` formatting
as discussed. Added Benno's SOB and CDB as discussed. Shortened
links. - Miguel ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
The 32-bit BAR spaces are reaching outside their assigned register
regions. Shrink them to match their actual sizes.
This resolves an issue where the regions overlap and one of the
controllers won't come up, which can be seen in the log as:
qcom-pcie 1c08000.pci: resource collision: [mem 0x7c300000-0x7fffffff] conflicts with 1c00000.pci dbi [mem 0x7e000000-0x7e000f1c]
While at it, unify the style.
Fixes: 5eb83fc102 ("arm64: dts: qcom: x1e80100: Add PCIe nodes")
Cc: stable@vger.kernel.org
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
Tested-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20240710-topic-barman-v1-1-5f63fca8d0fc@linaro.org
[bjorn: Added note about overlapping resource regions]
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
The embedded controller code is mainly used on x86 laptops and cannot
work without PC style I/O port access.
Make this a user-visible configuration option that is default enabled
on x86 but otherwise disabled, and that can never be enabled unless
CONFIG_HAS_IOPORT is also available.
The empty stubs in internal.h help ignore the EC code in configurations
that don't support it. In order to see those stubs, the sbshc code also
has to include this header and drop duplicate declarations.
All the direct callers of ec_read/ec_write already had an x86
dependency and now also need to depend on APCI_EC.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patch.msgid.link/20241011061948.3211423-1-arnd@kernel.org
[ rjw: Subject edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
The variable ret is initialized to zero and a littler later in
the PFRT_LOG_IOC_GET_INFO case of a switch statement is being checked
for negative error value. Since ret has not been re-assigned since
the initialization ret can never be less than zero so the check is
redundant and can be removed. Remove it.
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://patch.msgid.link/20241014130522.1986428-1-colin.i.king@gmail.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Enable PCIe1 controller and its corresponding PHY nodes on
qcs6490-rb3g2 platform.
SMMU v2 has limited SID's to assign dynamic SID's with the existing
logic. For now, use static iommu-map table assigning unique SID's for
each port as dynamic approach needs boarder community discussions.
PCIe switch connected to this board has 3 downstream ports and
to the one of the downstream an embedded ethernet is connected.
Assign unique SID for each downstream port and to embedded ethernet,
and also reserve a SID for the endpoints which are going to be
connected to the other two downstream ports.
As this PCIe switch is present in this platform only update iommu-map
in this platform only as other board variants might have different
PCIe topology and might need different mapping.
Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com>
Link: https://lore.kernel.org/r/20241024-enable_pcie-v2-1-e5a6f5da74e4@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
When the nominal_freq recorded by the kernel is equal to the lowest_freq,
and the frequency adjustment operation is triggered externally, there is
a logic error in cppc_perf_to_khz()/cppc_khz_to_perf(), resulting in perf
and khz conversion errors.
Fix this by adding a branch processing logic when nominal_freq is equal
to lowest_freq.
Fixes: ec1c7ad476 ("cpufreq: CPPC: Fix performance/frequency conversion")
Signed-off-by: liwei <liwei728@huawei.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Link: https://patch.msgid.link/20241024022952.2627694-1-liwei728@huawei.com
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Clang 19 prints a warning when we pass &th->guid to efi_pa_va_lookup():
drivers/acpi/prmt.c:156:29: error: passing 1-byte aligned argument to
4-byte aligned parameter 1 of 'efi_pa_va_lookup' may result in an
unaligned pointer access [-Werror,-Walign-mismatch]
156 | (void *)efi_pa_va_lookup(&th->guid, handler_info->handler_address);
| ^
The problem is that efi_pa_va_lookup() takes a efi_guid_t and &th->guid
is a regular guid_t. The difference between the two types is the
alignment. efi_guid_t is a typedef.
typedef guid_t efi_guid_t __aligned(__alignof__(u32));
It's possible that this a bug in Clang 19. Even though the alignment of
&th->guid is not explicitly specified, it will still end up being aligned
at 4 or 8 bytes.
Anyway, as Ard points out, it's cleaner to change guid to efi_guid_t type
and that also makes the warning go away.
Fixes: 088984c8d5 ("ACPI: PRM: Find EFI_MEMORY_RUNTIME block for PRM handler and context")
Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
Suggested-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Tested-by: Paul E. McKenney <paulmck@kernel.org>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://patch.msgid.link/3777d71b-9e19-45f4-be4e-17bf4fa7a834@stanley.mountain
[ rjw: Subject edit ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
There are now more directories that someone else maintains than ones I
do, so invert the pattern to cover included, rather than included
directories. Ditto for the bindings directory - there's more files there
that are the responsibility of others than mine (and I get CCed on all
bindings anyway). Remove it from the entry.
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
