Add explicit default labels to switch statements in lm75_is_visible().
This makes the control flow explicit and improves readability, but also
keeps consistency to other usage of the switch statement in the driver.
Signed-off-by: Flaviu Nistor <flaviu.nistor@gmail.com>
Link: https://lore.kernel.org/r/20260417055700.5739-1-flaviu.nistor@gmail.com
[groeck: Reformatted description for line length]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Similar to other HWMON sensors add a section in the
documentation describing the sysfs attributes, their
permissions and a short description.
Signed-off-by: Flaviu Nistor <flaviu.nistor@gmail.com>
Link: https://lore.kernel.org/r/20260417054511.5432-1-flaviu.nistor@gmail.com
[groeck: Removed trailing ":" from attribute names; fixed minor typo]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Add support for MPS mp2985 controller. This driver exposes
telemetry and limit value readings and writtings.
Signed-off-by: Wensheng Wang <wenswang@yeah.net>
Link: https://lore.kernel.org/r/20260414092921.1067735-2-wenswang@yeah.net
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Add support for MPS mp2985 controller.
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Wensheng Wang <wenswang@yeah.net>
Link: https://lore.kernel.org/r/20260414092921.1067735-1-wenswang@yeah.net
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Replace hardcoded IB_WIDTH_4X/IB_SPEED_EDR with ib_get_eth_speed()
to report the actual link speed in mana_ib_query_port().
Fixes: 4bda1d5332 ("RDMA/mana_ib: Implement port parameters")
Link: https://patch.msgid.link/r/20260512094056.264827-1-kotaranov@linux.microsoft.com
Signed-off-by: Shiraz Saleem <shirazsaleem@microsoft.com>
Signed-off-by: Konstantin Taranov <kotaranov@microsoft.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Store the client path statistics in the RTRS client path allocation
instead of allocating them separately.
This ties the stats lifetime directly to the path and removes a separate
allocation failure path. Keep freeing the per-CPU stats data separately,
but do not free the embedded stats object from error paths or the stats
kobject release handler.
Link: https://patch.msgid.link/r/20260511041812.378030-1-rosenp@gmail.com
Assisted-by: Codex:GPT-5.5
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Acked-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
A bunch of Samsung SoCs are missing the EL2 virtual timer interrupt
despite using ARMv8.1+ CPUs. Add the missing interrupt, except for
those broken designs where the interrupt is documented as not being
wired.
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://patch.msgid.link/20260523140242.586031-9-maz@kernel.org
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
- Fix ITS EventID sanitisation when restoring an interrupt translation
table.
- Fix PPI memory leak when failing to initialise a vcpu.
- Correctly return an error when the validation of a hypervisor trace
descriptor fails, and limit this validation to protected mode only.
RISC-V:
- Fix invalid HVA warning in steal-time recording
- Return SBI_ERR_FAILURE to guest upon OOM in pmu_event_info()
and pmu_snapshot_set_shmem()
- Fix NULL pointer dereference in SBI v0.1 SEND_IPI handler
- Fix sign extension of value for MMIO loads
s390:
- Fix bugs in vSIE (nested virtualization) and UCONTROL, caused by the page
table rewrite.
x86:
- Apply erratum #1235 workaround (disable AVIC IPI virtualization) on Hygon
Family 18h, just like on AMD Family 17h.
- When KVM_CAP_X86_APIC_BUS_CYCLES_NS is queried on a specific VM, return
the VM's configured APIC bus frequency instead of the default. This
is less confusing (read: not wrong) and makes it easier to fill in CPUID
information that communicates the APIC bus frequency to the guest.
Selftests:
- Do not include glibc-internal <bits/endian.h>; it worked by chance and
broke building KVM selftests with musl.
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull kvm fixes from Paolo Bonzini:
"arm64:
- Fix ITS EventID sanitisation when restoring an interrupt
translation table.
- Fix PPI memory leak when failing to initialise a vcpu.
- Correctly return an error when the validation of a hypervisor trace
descriptor fails, and limit this validation to protected mode only.
RISC-V:
- Fix invalid HVA warning in steal-time recording
- Return SBI_ERR_FAILURE to guest upon OOM in pmu_event_info() and
pmu_snapshot_set_shmem()
- Fix NULL pointer dereference in SBI v0.1 SEND_IPI handler
- Fix sign extension of value for MMIO loads
s390:
- Fix bugs in vSIE (nested virtualization) and UCONTROL, caused by
the page table rewrite.
x86:
- Apply erratum #1235 workaround (disable AVIC IPI virtualization) on
Hygon Family 18h, just like on AMD Family 17h.
- When KVM_CAP_X86_APIC_BUS_CYCLES_NS is queried on a specific VM,
return the VM's configured APIC bus frequency instead of the
default. This is less confusing (read: not wrong) and makes it
easier to fill in CPUID information that communicates the APIC bus
frequency to the guest.
Selftests:
- Do not include glibc-internal <bits/endian.h>; it worked by chance
and broke building KVM selftests with musl"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
KVM: SVM: Disable AVIC IPI virtualization on Hygon Family 18h (erratum #1235)
KVM: selftests: Verify that KVM returns the configured APIC cycle length
KVM: x86: Return the VM's configured APIC bus frequency when queried
KVM: selftests: elf: Include <endian.h> instead of <bits/endian.h>
KVM: s390: Properly reset zero bit in PGSTE
KVM: s390: vsie: Fix redundant rmap entries
KVM: s390: vsie: Fix unshadowing logic
KVM: s390: Fix leaking kvm_s390_mmu_cache in case of errors
KVM: s390: vsie: Fix memory leak when unshadowing
KVM: arm64: Fix nVHE/pKVM hyp tracing error on invalid desc
KVM: arm64: vgic: Free private_irqs when init fails after allocation
KVM: arm64: vgic-its: Reject restored DTE with out-of-range num_eventid_bits
RISC-V: KVM: Fix sign extension for MMIO loads
RISC-V: KVM: Fix NULL pointer dereference in SBI v0.1 SEND_IPI handler
riscv: kvm: return SBI_ERR_FAILURE for pmu_event_info() when OOM
riscv: kvm: return SBI_ERR_FAILURE for pmu_snapshot_set_shmem() when OOM
RISC-V: KVM: Fix invalid HVA warning in steal-time recording
On platforms with multiple xSPI instances, the driver fails to probe
additional instances due to duplicate sysfs entries:
[ 86.878242] sysfs: cannot create duplicate filename '/bus/platform/devices/rpc-if-spi'
This occurs because platform_device_alloc() uses pdev->id for the device
ID, which may be PLATFORM_DEVID_NONE (-1) for multiple instances, causing
all instances to attempt registration with the same name.
Fix this by using PLATFORM_DEVID_AUTO instead, which automatically assigns
unique IDs to each device instance, allowing multiple xSPI controllers to
coexist without naming conflicts.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://patch.msgid.link/20260515115202.1515577-3-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Document xSPI controller found on the Renesas RZ/T2H and RZ/N2H SoCs.
The xSPI IP on these SoCs is identical to that found on the RZ/G3E SoC.
The RZ/G3E HW manual (Rev.1.15) references bridge channel 1 and its
bits, however the hardware actually supports only a single bridge
channel (channel 0), matching the RZ/T2H design. The references to
channel 1 and its configuration bits will be corrected in a future
revision of the HW manual.
Update clock/reset constraints to handle the SoC differences.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260515115202.1515577-2-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Recent W=1 builds print kerneldoc warnings, even though a correct
kerneldoc is there:
Warning: drivers/memory/omap-gpmc.c:441 Excess function parameter 'cs' description in 'get_gpmc_timing_reg'
Drop additional inline comments for arguments to fix that. They are
anyway not that useful.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260520111630.89365-2-krzysztof.kozlowski@oss.qualcomm.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
io_register_iowq_max_workers() walks ctx->tctx_list under ctx->tctx_lock
and dereferences each node's task->io_uring without a NULL check:
list_for_each_entry(node, &ctx->tctx_list, ctx_node) {
tctx = node->task->io_uring;
if (WARN_ON_ONCE(!tctx->io_wq))
continue;
...
}
__io_uring_add_tctx_node() installs the node into ctx->tctx_list (via
io_tctx_install_node(), which does the list_add() under tctx_lock) and
only assigns current->io_uring = tctx afterwards. A task doing its first
io_uring operation on a shared ring therefore has a window in which its
node is already visible on ctx->tctx_list while node->task->io_uring is
still NULL. A concurrent IORING_REGISTER_IOWQ_MAX_WORKERS on the same
ring reads that NULL and dereferences tctx->io_wq:
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
RIP: io_register_iowq_max_workers io_uring/register.c:423
Publish current->io_uring = tctx before installing the node, so any node
visible on ctx->tctx_list always has a valid task->io_uring.
Fixes: 7880174e1e ("io_uring/tctx: clean up __io_uring_add_tctx_node() error handling")
Signed-off-by: Lim HyeonJun <shja0831@gmail.com>
Link: https://patch.msgid.link/20260524110853.115634-1-shja0831@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
- On SEV guests, handle set_memory_{encrypted,decrypted}()
failures more conservatively by assuming that all affected
pages are unencrypted (Carlos López)
- Disable broadcast TLB flush when PCID is disabled
(Tom Lendacky)
- Fix VMX vs. hrtimer_rearm_deferred() regression
(Peter Zijlstra)
- Move IRQ/NMI dispatch code from KVM into x86 core, to
prepare for a KVM x2apic fix (Peter Zijlstra)
- Fix incorrect munmap() size on map_vdso() failure
(Guilherme Giacomo Simoes)
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'x86-urgent-2026-05-24' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Ingo Molnar:
- On SEV guests, handle set_memory_{encrypted,decrypted}() failures
more conservatively by assuming that all affected pages are
unencrypted (Carlos López)
- Disable broadcast TLB flush when PCID is disabled (Tom Lendacky)
- Fix VMX vs. hrtimer_rearm_deferred() regression (Peter Zijlstra)
- Move IRQ/NMI dispatch code from KVM into x86 core, to prepare for a
KVM x2apic fix (Peter Zijlstra)
- Fix incorrect munmap() size on map_vdso() failure (Guilherme Giacomo
Simoes)
* tag 'x86-urgent-2026-05-24' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
virt: sev-guest: Explicitly leak pages in unknown state
x86/mm: Disable broadcast TLB flush when PCID is disabled
x86/kvm/vmx: Fix VMX vs hrtimer_rearm_deferred()
x86/kvm/vmx: Move IRQ/NMI dispatch from KVM into x86 core
x86/vdso: Fix incorrect size in munmap() on map_vdso() failure
- Fix the hardware probing error path of the renesas-rzt2h
irqchip driver
- Fix the exynos-combiner irqchip driver on -rt kernels
by turning the IRQ controller spinlock into a raw spinlock
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'irq-urgent-2026-05-24' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull irqchip driver fixes from Ingo Molnar:
- Fix the hardware probing error path of the renesas-rzt2h
irqchip driver
- Fix the exynos-combiner irqchip driver on -rt kernels
by turning the IRQ controller spinlock into a raw spinlock
* tag 'irq-urgent-2026-05-24' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
irqchip/renesas-rzt2h: Use pm_runtime_put_sync() in probe error path
irqchip/exynos-combiner: Switch to raw_spinlock
- Fix debugobjects regression on -rt kernels: don't fill the
pool (which uses a coarse lock) if ->pi_blocked_on, because
that messes up the priority inheritance of callers.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'core-urgent-2026-05-24' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull debugobjects fix from Ingo Molnar::
- Fix debugobjects regression on -rt kernels: don't fill the pool
(which uses a coarse lock) if ->pi_blocked_on, because that messes up
the priority inheritance of callers
* tag 'core-urgent-2026-05-24' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
debugobjects: Do not fill_pool() if pi_blocked_on
- adm1266: Various fixes from Abdurrahman Hussain
The fixed issues were reported by Sashiko as part of a code review of a
functional change in the driver.
- lenovo-ec-sensors: Convert to devm_request_region() to fix release_region
cleanup, and fix EC "MCHP" signature validation logic, from Kean Ren
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Merge tag 'hwmon-for-v7.1-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging
Pull hwmon fixes from Guenter Roeck:
- adm1266: Various fixes from Abdurrahman Hussain
The fixed issues were reported by Sashiko as part of a code review of
a functional change in the driver.
- lenovo-ec-sensors: Convert to devm_request_region() to fix
release_region cleanup, and fix EC "MCHP" signature validation logic,
from Kean Ren
* tag 'hwmon-for-v7.1-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
hwmon: (pmbus/adm1266) serialize sequencer_state debugfs read with pmbus_lock
hwmon: (pmbus/adm1266) serialize NVMEM blackbox read with pmbus_lock
hwmon: (pmbus/adm1266) serialize GPIO PMBus accesses with pmbus_lock
hwmon: (pmbus/adm1266) register the nvmem device after pmbus_do_probe()
hwmon: (pmbus/adm1266) register the gpio_chip after pmbus_do_probe()
hwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors
hwmon: (pmbus/adm1266) don't clobber GPIO bits before PDIO read in get_multiple
hwmon: (pmbus/adm1266) cap PDIO scan in get_multiple at ADM1266_PDIO_NR
hwmon: (pmbus/adm1266) bounce blackbox records through a protocol-sized buffer
hwmon: (pmbus/adm1266) include adapter number in GPIO line label
hwmon: (pmbus/adm1266) include PEC byte in pmbus_block_xfer read buffer
hwmon: (pmbus/adm1266) reject implausible blackbox record_count
hwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX
hwmon: (pmbus/adm1266) seed timestamp from the real-time clock
hwmon: (lenovo-ec-sensors): Fix EC "MCHP" signature validation logic
hwmon: (lenovo-ec-sensors): Convert to devm_request_region()
After commit 3392291fc5 ("drm/msm: Fix shrinker deadlock"), all
supported versions of clang warn (or error with CONFIG_WERROR=y):
drivers/gpu/drm/msm/msm_gem_shrinker.c:105:58: error: omitting the parameter name in a function definition is a C23 extension [-Werror,-Wc23-extensions]
105 | purge(struct drm_gem_object *obj, struct ww_acquire_ctx *)
| ^
drivers/gpu/drm/msm/msm_gem_shrinker.c:117:58: error: omitting the parameter name in a function definition is a C23 extension [-Werror,-Wc23-extensions]
117 | evict(struct drm_gem_object *obj, struct ww_acquire_ctx *)
| ^
2 errors generated.
With older but supported versions of GCC, this is an unconditional hard error:
drivers/gpu/drm/msm/msm_gem_shrinker.c: In function 'purge':
drivers/gpu/drm/msm/msm_gem_shrinker.c:105:35: error: parameter name omitted
purge(struct drm_gem_object *obj, struct ww_acquire_ctx *)
^~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/msm/msm_gem_shrinker.c: In function 'evict':
drivers/gpu/drm/msm/msm_gem_shrinker.c:117:35: error: parameter name omitted
evict(struct drm_gem_object *obj, struct ww_acquire_ctx *)
^~~~~~~~~~~~~~~~~~~~~~~
Restore the parameter name to clear up the warnings, renaming it
"unused" to make it clear it is only needed to satisfy the prototype of
drm_gem_lru_scan().
Cc: stable@vger.kernel.org
Fixes: 3392291fc5 ("drm/msm: Fix shrinker deadlock")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Enable DT overlays on some of the Pine64 devices to enable
use of addon accessories such as WiFi or audio modules.
Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Link: https://patch.msgid.link/20260518220455.156874-1-pbrobinson@gmail.com
Signed-off-by: Chen-Yu Tsai <wens@kernel.org>
The driver supports a new comp_mask: REQ_MASK_FIXED_QUE_ATTR.
The application sets this comp_mask bit in the CREATE_QP ureq
to indicate direct control of the QP. The driver goes through
the required processing for app allocated QPs (previous patches).
Only variable WQE mode is supported for these QPs.
This patch removes an unused comp_mask:
BNXT_RE_QP_REQ_MASK_VAR_WQE_SQ_SLOTS
Link: https://patch.msgid.link/r/20260519150041.7251-10-sriharsha.basavapatna@broadcom.com
Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Reviewed-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
App allocated QPs can use a separate doorbell for each QP.
This doorbell region can be passed through a new driver specific
DBR_HANDLE attribute, during QP creation. When this attribute
is set, associate the QP with the given doorbell region.
While the QP holds a reference to the dbr, the dbr itself
cannot be destroyed and is rejected with EBUSY error.
Link: https://patch.msgid.link/r/20260519150041.7251-9-sriharsha.basavapatna@broadcom.com
Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Reviewed-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
If the DPI is freed when the dbr object is freed, but if the
process has not unmapped the page yet, then the DPI slot could
get reallocated to another process while the original process
still has it mapped. To prevent this, save the DPI info in the
mmap entry during dbr allocation and free the DPI slot from
bnxt_re_mmap_free(), which enures that there are no references
to it.
This change is needed to support doorbell allocation to QPs
in the next patch.
Link: https://patch.msgid.link/r/20260519150041.7251-8-sriharsha.basavapatna@broadcom.com
Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Reviewed-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
The current logic in the doorbell cleanup function is not
sufficient for a change in a subsequent patch, that fails
doorbell remove operation in some conditions. The cleanup
should facilitate freeing of the dbr object when the caller
may not retry the teardown operation (implicit teardown:
process-exit/driver-removal).
Extend this counter to use kref mechanism so that the dbr
object gets freed (via kref callback) when there are no more
references to it, rather than directly freeing it in the
cleanup uapi.
Link: https://patch.msgid.link/r/20260519150041.7251-7-sriharsha.basavapatna@broadcom.com
Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Reviewed-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
The hwq depth shouldn't be computed using slots/round-up logic for
app allocated QPs, use the max_wqe value saved earlier.
Link: https://patch.msgid.link/r/20260519150041.7251-6-sriharsha.basavapatna@broadcom.com
Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Reviewed-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
For app allocated QPs, the driver shouldn't use slots/round-up logic
to compute the msn table size. The application handles this logic
and computes 'sq_npsn' and passes it to the driver using a new uapi
parameter.
Link: https://patch.msgid.link/r/20260519150041.7251-5-sriharsha.basavapatna@broadcom.com
Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Reviewed-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
For app allocated QPs, there's no need to reserve extra slots.
The application accounts for this while allocating the SQ.
Link: https://patch.msgid.link/r/20260519150041.7251-4-sriharsha.basavapatna@broadcom.com
Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Reviewed-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
For app allocated QPs, there's no need to add extra slots or
to round up the slot count. Use 'max_recv_wr' count provided
by the application as is.
Link: https://patch.msgid.link/r/20260519150041.7251-3-sriharsha.basavapatna@broadcom.com
Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Reviewed-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
The umem changes for CQ added a helper - bnxt_re_setup_sginfo().
Use the same helper for QP creation since we support only 4K
pages for QP ring memory too.
Add a new helper function bnxt_re_get_psn_bytes() to improve
readability as this code will be updated in subsequent patches.
Link: https://patch.msgid.link/r/20260519150041.7251-2-sriharsha.basavapatna@broadcom.com
Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Reviewed-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
The following scenarios will cause the call_rcu_tasks() boot-time
tests failed:
CPU0 CPU1
rcu_init_tasks_generic()
->rcu_tasks_initiate_self_tests()
->call_rcu_tasks_trace(&tests[1].rh, test_rcu_tasks_callback)
->call_rcu_tasks_generic()
->havekthread = smp_load_acquire(&rtp->kthread_ptr)
"The havekthread is false"
....
rcu_tasks_kthread()
->smp_store_release(&rtp->kthread_ptr, current)
->rcu_tasks_one_gp()
->rcuwait_wait_event()
->rcu_tasks_need_gpcb()
->for (cpu = 0; cpu < dequeue_limit; cpu++)
->rcu_segcblist_n_cbs(&rtpcp->cblist) == 0
->schedule()
->raw_spin_trylock_rcu_node()
->needwake = (func == wakeme_after_rcu) ||
(rcu_segcblist_n_cbs(&rtpcp->cblist) == rcu_task_lazy_lim)
"the rcu_task_lazy_lim default value is 32, and the
func pointer is test_rcu_tasks_callback, lead to needwake
is false."
->if (havekthread && !needwake && !timer_pending(&rtpcp->lazy_timer))
"the havekthread is false, will not enter here."
....
"the needwake is false lead to rtp_irq_work can not queue,
even if the rtp->kthread_ptr already exists at this point."
->if (needwake && READ_ONCE(rtp->kthread_ptr))
->irq_work_queue(&rtpcp->rtp_irq_work)
For the above scenarios, if the call_rcu_tasks() is not called again
afterward, the rcu_tasks_kthread will not have a chance to be wakeup,
the test_rcu_tasks_callback() will never be called, the boot-time tests
failed can happen, this commit therefore check havekthread variable, if
it's false and the rtpcp->cblist is empty, set needwake variable is true,
if the rtp->kthread_ptr exist, the rtpcp->rtp_irq_work can be queued to
wakeup rcu_tasks_kthread.
Signed-off-by: Zqiang <qiang.zhang@linux.dev>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Currently, rcu_normal_wake_from_gp is only enabled by default
on small systems(<= 16 CPUs) or when a user explicitly set it
enabled.
Introduce an adaptive latching mechanism:
* Track the number of in-flight synchronize_rcu() requests
using a new rcu_sr_normal_count counter;
* If the count reaches/exceeds RCU_SR_NORMAL_LATCH_THR(64),
it sets the rcu_sr_normal_latched, reverting new requests
onto the scaled wait_rcu_gp() path;
* The latch is cleared only when the pending requests are fully
drained(nr == 0);
* Enables rcu_normal_wake_from_gp by default for all systems,
relying on this dynamic throttling instead of static CPU
limits.
Testing(synthetic flood workload):
* Kernel version: 6.19.0-rc6
* Number of CPUs: 1536
* 60K concurrent synchronize_rcu() calls
Perf(cycles, system-wide):
total cycles: 932020263832
rcu_sr_normal_add_req(): 2650282811 cycles(~0.28%)
Perf report excerpt:
0.01% 0.01% sync_test/... [k] rcu_sr_normal_add_req
Measured overhead of rcu_sr_normal_add_req() remained ~0.28%
of total CPU cycles in this synthetic stress test.
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Tested-by: Samir M <samir@linux.ibm.com>
Suggested-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
This commit documents the rcu_access_pointer() use case for fetching the
old value of an RCU-protected pointer within a lockless updater for use
by an atomic cmpxchg() operation.
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Reported-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
This commit replaces a nested ?: sequence with clamp_val(). This does
not reduce the number of lines of code, but it does simplify the line
that it modifies.
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
This commit replaces a nested ?: sequence with clamp(). This does not
reduce the number of lines of code, but it does simplify the line that
it modifies.
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
It turns out that there are BPF use cases that rely on nesting RCU
Tasks Trace readers. These use cases are well-served by the old
rcu_read_lock_trace() and rcu_read_unlock_trace() functions that maintain
a nesting counter in the task_struct structure. But these use cases incur
a performance penalty when using the shiny new rcu_read_lock_tasks_trace()
and rcu_read_unlock_tasks_trace() functions, which nest in the same way
that SRCU does.
This means that rcu_read_lock_trace() and rcu_read_unlock_trace()
will be with us for some time. Therefore, remove the checkpatch.pl
deprecation.
Also, the rcu_read_lock_tasks_trace() and rcu_read_unlock_tasks_trace()
functions are intended for use only by BPF. Therefore, add them to
the list of functions that checkpatch complains about outside of BPF
(and of course, RCU).
Reported-by: Puranjay Mohan <puranjay@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Andy Whitcroft <apw@canonical.com>
Cc: Joe Perches <joe@perches.com>
Cc: Dwaipayan Ray <dwaipayanray1@gmail.com>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
s/srcu_read_lock_safe()/srcu_read_lock_fast_updown(), there being no
such thing as srcu_read_lock_safe().
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
This adds "--do-norm", --do-no-norm", and "--no-norm" synonyms for the
"--do-normal" group of torture.sh command-line arguments.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
The constraints on the arguments to kvm-series.sh are easy to forget,
so this commit adds examples in the header comment.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
This new torture_sched_set_normal() function clamps the nice value at
the MIN_NICE..MAX_NICE limits, splatting it these limits are exceeded.
It then invokes sched_set_normal() to set the new value. This prevents
more difficult-to-debug failures within the scheduler.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Currently, rcutorture bypasses lazy RCU by using call_rcu_hurry().
This works, avoiding the dreaded rtort_pipe_count WARN(), but fails to
fully test lazy RCU. The rtort_pipe_count WARN() splats because lazy RCU
could delay the start of an RCU grace period for a full stutter period,
which defaults to only three seconds.
This commit therefore reverts the call_rcu_hurry() instances
back to call_rcu(), but, in kernels built with CONFIG_RCU_LAZY=y,
queues a workqueue handler just before the call to stutter_wait() in
rcu_torture_writer(). This workqueue handler invokes rcu_barrier(),
which motivates any lingering lazy callbacks, thus avoiding the splat.
Reported-by: Saravana Kannan <saravanak@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Extend the binding to cover details specific to the Tenstorrent RISC-V
IOMMU. In particular, a second register range is added which contains
M-privileged registers, e.g., PMAs and PMPs.
The RISC-V spec S-privileged registers remain in the first register
range and are compatible with "riscv,iommu" so the Linux driver does not
notice any difference, but the binding will be used by OpenSBI and
potentially other M-mode software.
Reviewed-by: Joel Stanley <joel@jms.id.au>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Acked-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[fustini: fix dt_binding_check errors]
Signed-off-by: Drew Fustini <fustini@kernel.org>
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Merge tag 'for-7.1-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
Pull btrfs fixes from David Sterba:
"A batch of fixes to simple quotas:
- add conditional rescheduling point not dependent on the lock during
inode iterations to avoid delays with PREEMPT_NONE enabled
- fix subvolume deletion so it does not break the squota invariants
- properly handle enabling squota, tracking extents in the initial
transaction
- catch and warn about underflows, clamp to zero to avoid further
problems
And one fix to inode size handling:
- fix handling of preallocated extents beyond i_size when not using
the no-holes feature"
* tag 'for-7.1-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
btrfs: swallow btrfs_record_squota_delta() ENOENT
btrfs: clamp to avoid squota underflow
btrfs: fix squota accounting during enable generation
btrfs: check for subvolume before deleting squota qgroup
btrfs: always drop root->inodes lock before cond_resched()
btrfs: mark file extent range dirty after converting prealloc extents
Add a riscv,pmu device tree node with SBI PMU event mappings for the
SiFive X280 hardware performance counters. This enables OpenSBI to
expose the SBI PMU extension, allowing Linux perf to use the 4
programmable counters (mhpmcounter3-6) across 3 event classes:
instruction commit, microarchitectural, and memory system events.
Event encodings are derived from the SiFive Tenstorrent X280 MC Manual
(21G3.04.00) Table 13, section 3.10.5.
Assisted-by: Claude:claude-opus-4-6[1m]
Signed-off-by: Michael Neuling <mikey@neuling.org>
Reviewed-by: Drew Fustini <fustini@kernel.org>
Signed-off-by: Drew Fustini <fustini@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
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Merge tag 'xfs-fixes-7.1-rc5' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Pull xfs fix from Carlos Maiolino:
"A single fix for a race in xfs buffer cache which may lead to
filesystem shutdown due to inconsistent metadata if the buffer
lookup happens to find an old dead buffer still in the cache"
* tag 'xfs-fixes-7.1-rc5' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
xfs: fix a buffer lookup against removal race
The assignment of strrchr() return values to non-const char * variables
triggers a -Werror=discarded-qualifiers warning when building with GCC
14.
This happens because in newer glibc versions, strrchr() returns a 'const
char *' if the input string is const.
Properly declare 'line2' and 'nl' as const char * to match the glibc
function signature and ensure type safety. This avoids the need for
explicit type casting and aligns with the design pattern of not
modifying read-only memory in the perf tool.
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Li Guan <guanli.oerv@isrc.iscas.ac.cn>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <pjw@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Fix a variable truncation when calculating period in microseconds as
part of the solution for the ERR051198 in .apply() callback.
Example scenario:
- Period of 3us (PWMPR = 196 and prescaler = 1)
- Expected value in tmp: 198000000000 (NSEC_PER_SEC * (196 + 2) * 1)
- Actual value is 431504384 (truncation to u32)
Signed-off-by: Ronaldo Nunez <rnunez@baylibre.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260522191348.6227-1-rnunez@baylibre.com
Fixes: a25351e4c7 ("pwm: imx27: Workaround of the pwm output bug when decrease the duty cycle")
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
PWMCON register Bit(3) is used to configure whether to pre divide
the clock source. Most revisions clear this bit to disable frequency
division. However, mt7628 needs to set this bit. Hence, we introduce
a new clksel_fixup flag to correctly configure the clock source for
mt7628.
Signed-off-by: Shiji Yang <yangshiji66@outlook.com>
Link: https://patch.msgid.link/OS7PR01MB136020DA816E8D601D5BA8BF4BC74A@OS7PR01MB13602.jpnprd01.prod.outlook.com
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
- Implement _THIS_IP_ for inline asm
- Add Simon Schuster as a maintainer and mark the NIOS2 as Supported
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Merge tag 'nios2_updates_for_v7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/dinguyen/linux
Pull nios2 fixes from Dinh Nguyen:
- Implement _THIS_IP_ for inline asm
- Add Simon Schuster as a maintainer and mark the NIOS2 as Supported
* tag 'nios2_updates_for_v7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/dinguyen/linux:
nios2: Implement _THIS_IP_ using inline asm
MAINTAINERS: arch/nios2: Add Simon Schuster as co-maintainer
