| Commit message (Collapse) | Author | Age | Files | Lines |
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git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms into irq/core
Pull irqchip updates from Marc Zyngier:
- A number of Loogson/Loogarch fixes
- Allow the core code to retrigger an interrupt that has
fired while the same interrupt is being handled on another
CPU, papering over a GICv3 architecture issue
- Work around an integration problem on ASR8601, where the CPU
numbering isn't representable in the GIC implementation...
- Add some missing interrupt to the STM32 irqchip
- A bunch of warning squashing triggered by W=1 builds
Link: https://lore.kernel.org/r/20230623224345.3577134-1-maz@kernel.org
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* irq/misc-6.5:
: .
: Misc cleanups:
:
: - Add a number of missing prototypes
: - Mark global symbol as static where needed
: - Drop some now useless non-DT code paths
: - Add a missing interrupt mapping to the STM32 irqchip
: - Silence another STM32 warning when building with W=1
: - Fix the jcore-aic driver that actually never worked...
: .
Revert "irqchip/mxs: Include linux/irqchip/mxs.h"
irqchip/jcore-aic: Fix missing allocation of IRQ descriptors
irqchip/stm32-exti: Fix warning on initialized field overwritten
irqchip/stm32-exti: Add STM32MP15xx IWDG2 EXTI to GIC map
irqchip/gicv3: Add a iort_pmsi_get_dev_id() prototype
irqchip/mxs: Include linux/irqchip/mxs.h
irqchip/clps711x: Remove unused clps711x_intc_init() function
irqchip/mmp: Remove non-DT codepath
irqchip/ftintc010: Mark all function static
irqdomain: Include internals.h for function prototypes
Signed-off-by: Marc Zyngier <maz@kernel.org>
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irq_domain_debugfs_init() is defined in irqdomain.c, but the
declaration is in a header that is not included here:
kernel/irq/irqdomain.c:1965:13: error: no previous prototype for 'irq_domain_debugfs_init' [-Werror=missing-prototypes]
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230516200432.554240-1-arnd@kernel.org
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There is a class of interrupt controllers out there that, once they
have signalled a given interrupt number, will still signal incoming
instances of the *same* interrupt despite the original interrupt
not having been EOIed yet.
As long as the new interrupt reaches the *same* CPU, nothing bad
happens, as that CPU still has its interrupts globally disabled,
and we will only take the new interrupt once the interrupt has
been EOIed.
However, things become more "interesting" if an affinity change comes
in while the interrupt is being handled. More specifically, while
the per-irq lock is being dropped. This results in the affinity change
taking place immediately. At this point, there is nothing that prevents
the interrupt from firing on the new target CPU. We end-up with the
interrupt running concurrently on two CPUs, which isn't a good thing.
And that's where things become worse: the new CPU notices that the
interrupt handling is in progress (irq_may_run() return false), and
*drops the interrupt on the floor*.
The whole race looks like this:
CPU 0 | CPU 1
-----------------------------|-----------------------------
interrupt start |
handle_fasteoi_irq | set_affinity(CPU 1)
handler |
... | interrupt start
... | handle_fasteoi_irq -> early out
handle_fasteoi_irq return | interrupt end
interrupt end |
If the interrupt was an edge, too bad. The interrupt is lost, and
the system will eventually die one way or another. Not great.
A way to avoid this situation is to detect this problem at the point
we handle the interrupt on the new target. Instead of dropping the
interrupt, use the resend mechanism to force it to be replayed.
Also, in order to limit the impact of this workaround to the pathetic
architectures that require it, gate it behind a new irq flag aptly
named IRQD_RESEND_WHEN_IN_PROGRESS.
Suggested-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: James Gowans <jgowans@amazon.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Marc Zyngier <maz@kernel.org>
Cc: KarimAllah Raslan <karahmed@amazon.com>
Cc: Yipeng Zou <zouyipeng@huawei.com>
Cc: Zhang Jianhua <chris.zjh@huawei.com>
[maz: reworded commit mesage]
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230608120021.3273400-3-jgowans@amazon.com
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Adding a bit more info about what the flags are used for may help future
code readers.
Signed-off-by: James Gowans <jgowans@amazon.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Liao Chang <liaochang1@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230608120021.3273400-2-jgowans@amazon.com
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git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen fixes from Juergen Gross:
- a double free fix in the Xen pvcalls backend driver
- a fix for a regression causing the MSI related sysfs entries to not
being created in Xen PV guests
- a fix in the Xen blkfront driver for handling insane input data
better
* tag 'for-linus-6.4-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
x86/pci/xen: populate MSI sysfs entries
xen/pvcalls-back: fix double frees with pvcalls_new_active_socket()
xen/blkfront: Only check REQ_FUA for writes
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Commit bf5e758f02fc ("genirq/msi: Simplify sysfs handling") reworked the
creation of sysfs entries for MSI IRQs. The creation used to be in
msi_domain_alloc_irqs_descs_locked after calling ops->domain_alloc_irqs.
Then it moved into __msi_domain_alloc_irqs which is an implementation of
domain_alloc_irqs. However, Xen comes with the only other implementation
of domain_alloc_irqs and hence doesn't run the sysfs population code
anymore.
Commit 6c796996ee70 ("x86/pci/xen: Fixup fallout from the PCI/MSI
overhaul") set the flag MSI_FLAG_DEV_SYSFS for the xen msi_domain_info
but that doesn't actually have an effect because Xen uses it's own
domain_alloc_irqs implementation.
Fix this by making use of the fallback functions for sysfs population.
Fixes: bf5e758f02fc ("genirq/msi: Simplify sysfs handling")
Signed-off-by: Maximilian Heyne <mheyne@amazon.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20230503131656.15928-1-mheyne@amazon.de
Signed-off-by: Juergen Gross <jgross@suse.com>
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The current implementation uses a static bitmap for interrupt descriptor
allocation and a radix tree to pointer store the pointer for lookup.
However, the size of the bitmap is constrained by the build time macro
MAX_SPARSE_IRQS, which may not be sufficient to support high-end servers,
particularly those with GICv4.1 hardware, which require a large interrupt
space to cover LPIs and vSGIs.
Replace the bitmap and the radix tree with a maple tree, which not only
stores pointers for lookup, but also provides a mechanism to find free
ranges. That removes the build time hardcoded upper limit.
Signed-off-by: Shanker Donthineni <sdonthineni@nvidia.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230519134902.1495562-4-sdonthineni@nvidia.com
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Move the open coded sparse bitmap handling into helper functions as
a preparatory step for converting the sparse interrupt management
to a maple tree.
No functional change.
Signed-off-by: Shanker Donthineni <sdonthineni@nvidia.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230519134902.1495562-3-sdonthineni@nvidia.com
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The current implementation utilizes a bitmap for managing interrupt resend
handlers, which is allocated based on the SPARSE_IRQ/NR_IRQS macros.
However, this method may not efficiently utilize memory during runtime,
particularly when IRQ_BITMAP_BITS is large.
Address this issue by using an hlist to manage interrupt resend handlers
instead of relying on a static bitmap memory allocation. Additionally, a
new function, clear_irq_resend(), is introduced and called from
irq_shutdown to ensure a graceful teardown of the interrupt.
Signed-off-by: Shanker Donthineni <sdonthineni@nvidia.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230519134902.1495562-2-sdonthineni@nvidia.com
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For interrupts with secondary threads, the affinity is applied when the
thread is created but if the interrupts affinity is changed later only
the primary thread is updated.
Update the secondary thread's affinity as well to keep all the interrupts
activity on the assigned CPUs.
Signed-off-by: John Keeping <john@metanate.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230406180857.588682-1-john@metanate.com
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull irq updates from Thomas Gleixner:
"A set of updates for the interrupt susbsystem:
- Prevent possible NULL pointer derefences in
irq_data_get_affinity_mask() and irq_domain_create_hierarchy()
- Take the per device MSI lock before invoking code which relies on
it being hold
- Make sure that MSI descriptors are unreferenced before freeing
them. This was overlooked when the platform MSI code was converted
to use core infrastructure and results in a fals positive warning
- Remove dead code in the MSI subsystem
- Clarify the documentation for pci_msix_free_irq()
- More kobj_type constification"
* tag 'irq-urgent-2023-03-05' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
genirq/msi, platform-msi: Ensure that MSI descriptors are unreferenced
genirq/msi: Drop dead domain name assignment
irqdomain: Add missing NULL pointer check in irq_domain_create_hierarchy()
genirq/irqdesc: Make kobj_type structures constant
PCI/MSI: Clarify usage of pci_msix_free_irq()
genirq/msi: Take the per-device MSI lock before validating the control structure
genirq/ipi: Fix NULL pointer deref in irq_data_get_affinity_mask()
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Miquel reported a warning in the MSI core which is triggered when
interrupts are freed via platform_msi_device_domain_free().
This code got reworked to use core functions for freeing the MSI
descriptors, but nothing took care to clear the msi_desc->irq entry, which
then triggers the warning in msi_free_msi_desc() which uses desc->irq to
validate that the descriptor has been torn down. The same issue exists in
msi_domain_populate_irqs().
Up to the point that msi_free_msi_descs() grew a warning for this case,
this went un-noticed.
Provide the counterpart of msi_domain_populate_irqs() and invoke it in
platform_msi_device_domain_free() before freeing the interrupts and MSI
descriptors and also in the error path of msi_domain_populate_irqs().
Fixes: 2f2940d16823 ("genirq/msi: Remove filter from msi_free_descs_free_range()")
Reported-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/87mt4wkwnv.ffs@tglx
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Since commit d59f6617eef0 ("genirq: Allow fwnode to carry name
information only") an IRQ domain is always given a name during
allocation (e.g. used for the debugfs entry).
Drop the unused fallback name assignment when creating MSI domains.
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230224130509.27814-1-johan+linaro@kernel.org
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The recent switch to per-domain locking caused a NULL dereference in
irq_domain_create_hierarchy(), as Xen code is calling
msi_create_irq_domain() with a NULL parent pointer.
Fix that by testing parent to be set before dereferencing it. For a
non-existing parent the irqdomain's root will stay to point to
itself.
Fixes: 9dbb8e3452ab ("irqdomain: Switch to per-domain locking")
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230223083800.31347-1-jgross@suse.com
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Pull in the upstream changes so a fix for them can be applied.
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Since commit ee6d3dd4ed48 ("driver core: make kobj_type constant.")
the driver core allows the usage of const struct kobj_type.
Take advantage of this to constify the structure definitions which prevents
modification at runtime.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230217-kobj_type-irq-v1-1-fedfacaf8cdb@weissschuh.net
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Calling msi_ctrl_valid() ultimately results in calling
msi_get_device_domain(), which requires holding the device MSI lock.
However, in msi_domain_populate_irqs() the lock is taken right after having
called msi_ctrl_valid(), which is just a tad too late.
Take the lock before invoking msi_ctrl_valid().
Fixes: 40742716f294 ("genirq/msi: Make msi_add_simple_msi_descs() device domain aware")
Reported-by: "Russell King (Oracle)" <linux@armlinux.org.uk>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/Y/Opu6ETe3ZzZ/8E@shell.armlinux.org.uk
Link: https://lore.kernel.org/r/20230220190101.314446-1-maz@kernel.org
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If ipi_send_{mask|single}() is called with an invalid interrupt number, all
the local variables there will be NULL. ipi_send_verify() which is invoked
from these functions does verify its 'data' parameter, resulting in a
kernel oops in irq_data_get_affinity_mask() as the passed NULL pointer gets
dereferenced.
Add a missing NULL pointer check in ipi_send_verify()...
Found by Linux Verification Center (linuxtesting.org) with the SVACE static
analysis tool.
Fixes: 3b8e29a82dd1 ("genirq: Implement ipi_send_mask/single()")
Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/b541232d-c2b6-1fe9-79b4-a7129459e4d0@omp.ru
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git://git.kernel.org/pub/scm/linux/kernel/git/jgg/iommufd
Pull iommufd updates from Jason Gunthorpe:
"Some polishing and small fixes for iommufd:
- Remove IOMMU_CAP_INTR_REMAP, instead rely on the interrupt
subsystem
- Use GFP_KERNEL_ACCOUNT inside the iommu_domains
- Support VFIO_NOIOMMU mode with iommufd
- Various typos
- A list corruption bug if HWPTs are used for attach"
* tag 'for-linus-iommufd' of git://git.kernel.org/pub/scm/linux/kernel/git/jgg/iommufd:
iommufd: Do not add the same hwpt to the ioas->hwpt_list twice
iommufd: Make sure to zero vfio_iommu_type1_info before copying to user
vfio: Support VFIO_NOIOMMU with iommufd
iommufd: Add three missing structures in ucmd_buffer
selftests: iommu: Fix test_cmd_destroy_access() call in user_copy
iommu: Remove IOMMU_CAP_INTR_REMAP
irq/s390: Add arch_is_isolated_msi() for s390
iommu/x86: Replace IOMMU_CAP_INTR_REMAP with IRQ_DOMAIN_FLAG_ISOLATED_MSI
genirq/msi: Rename IRQ_DOMAIN_MSI_REMAP to IRQ_DOMAIN_ISOLATED_MSI
genirq/irqdomain: Remove unused irq_domain_check_msi_remap() code
iommufd: Convert to msi_device_has_isolated_msi()
vfio/type1: Convert to iommu_group_has_isolated_msi()
iommu: Add iommu_group_has_isolated_msi()
genirq/msi: Add msi_device_has_isolated_msi()
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Resolve conflicts from the signature change in iommu_map:
- drivers/infiniband/hw/usnic/usnic_uiom.c
Switch iommu_map_atomic() to iommu_map(.., GFP_ATOMIC)
- drivers/vfio/vfio_iommu_type1.c
Following indenting change for GFP_KERNEL
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
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s390 doesn't use irq_domains, so it has no place to set
IRQ_DOMAIN_FLAG_ISOLATED_MSI. Instead of continuing to abuse the iommu
subsystem to convey this information add a simple define which s390 can
make statically true. The define will cause msi_device_has_isolated() to
return true.
Remove IOMMU_CAP_INTR_REMAP from the s390 iommu driver.
Link: https://lore.kernel.org/r/8-v3-3313bb5dd3a3+10f11-secure_msi_jgg@nvidia.com
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
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What x86 calls "interrupt remapping" is one way to achieve isolated MSI,
make it clear this is talking about isolated MSI, no matter how it is
achieved. This matches the new driver facing API name of
msi_device_has_isolated_msi()
No functional change.
Link: https://lore.kernel.org/r/6-v3-3313bb5dd3a3+10f11-secure_msi_jgg@nvidia.com
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
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After converting the users of irq_domain_check_msi_remap() it and the
helpers are no longer needed.
The new version does not require all the #ifdef helpers and inlines
because CONFIG_GENERIC_MSI_IRQ always requires CONFIG_IRQ_DOMAIN and
IRQ_DOMAIN_HIERARCHY.
Link: https://lore.kernel.org/r/5-v3-3313bb5dd3a3+10f11-secure_msi_jgg@nvidia.com
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
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This will replace irq_domain_check_msi_remap() in following patches.
The new API makes it more clear what "msi_remap" actually means from a
functional perspective instead of identifying an implementation specific
HW feature.
Isolated MSI means that HW modeled by an irq_domain on the path from the
initiating device to the CPU will validate that the MSI message specifies
an interrupt number that the device is authorized to trigger. This must
block devices from triggering interrupts they are not authorized to
trigger. Currently authorization means the MSI vector is one assigned to
the device.
This is interesting for securing VFIO use cases where a rouge MSI (eg
created by abusing a normal PCI MemWr DMA) must not allow the VFIO
userspace to impact outside its security domain, eg userspace triggering
interrupts on kernel drivers, a VM triggering interrupts on the
hypervisor, or a VM triggering interrupts on another VM.
As this is actually modeled as a per-irq_domain property, not a global
platform property, correct the interface to accept the device parameter
and scan through only the part of the irq_domains hierarchy originating
from the source device.
Locate the new code in msi.c as it naturally only works with
CONFIG_GENERIC_MSI_IRQ, which also requires CONFIG_IRQ_DOMAIN and
IRQ_DOMAIN_HIERARCHY.
Link: https://lore.kernel.org/r/1-v3-3313bb5dd3a3+10f11-secure_msi_jgg@nvidia.com
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull irq updates from Thomas Gleixner:
"Updates for the interrupt subsystem:
Core:
- Move the interrupt affinity spreading mechanism into lib/group_cpus
so it can be used for similar spreading requirements, e.g. in the
block multi-queue code
This also contains a first usecase in the block multi-queue code
which Jens asked to take along with the librarization
- Improve irqdomain locking to close a number race conditions which
can be observed with massive parallel device driver probing
- Enforce and document the semantics of disable_irq() which cannot be
invoked safely from non-sleepable context
- Move the IPI multiplexing code from the Apple AIC driver into the
core, so it can be reused by RISCV
Drivers:
- Plug OF node refcounting leaks in various drivers
- Correctly mark level triggered interrupts in the Broadcom L2
drivers
- The usual small fixes and improvements
- No new drivers for the record!"
* tag 'irq-core-2023-02-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (42 commits)
irqchip/irq-bcm7120-l2: Set IRQ_LEVEL for level triggered interrupts
irqchip/irq-brcmstb-l2: Set IRQ_LEVEL for level triggered interrupts
irqdomain: Switch to per-domain locking
irqchip/mvebu-odmi: Use irq_domain_create_hierarchy()
irqchip/loongson-pch-msi: Use irq_domain_create_hierarchy()
irqchip/gic-v3-mbi: Use irq_domain_create_hierarchy()
irqchip/gic-v3-its: Use irq_domain_create_hierarchy()
irqchip/gic-v2m: Use irq_domain_create_hierarchy()
irqchip/alpine-msi: Use irq_domain_add_hierarchy()
x86/uv: Use irq_domain_create_hierarchy()
x86/ioapic: Use irq_domain_create_hierarchy()
irqdomain: Clean up irq_domain_push/pop_irq()
irqdomain: Drop leftover brackets
irqdomain: Drop dead domain-name assignment
irqdomain: Drop revmap mutex
irqdomain: Fix domain registration race
irqdomain: Fix mapping-creation race
irqdomain: Refactor __irq_domain_alloc_irqs()
irqdomain: Look for existing mapping only once
irqdomain: Drop bogus fwspec-mapping error handling
...
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git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms into irq/core
Pull irqchip updates from Marc Zyngier:
- New and improved irqdomain locking, closing a number of races that
became apparent now that we are able to probe drivers in parallel
- A bunch of OF node refcounting bugs have been fixed
- We now have a new IPI mux, lifted from the Apple AIC code and
made common. It is expected that riscv will eventually benefit
from it
- Two small fixes for the Broadcom L2 drivers
- Various cleanups and minor bug fixes
Link: https://lore.kernel.org/r/20230218143452.3817627-1-maz@kernel.org
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* irq/irqdomain-locking:
: .
: irqdomain locking overhaul courtesy of Johan Hovold.
:
: From the cover letter:
:
: "Parallel probing (e.g. due to asynchronous probing) of devices that
: share interrupts can currently result in two mappings for the same
: hardware interrupt to be created.
:
: This series fixes this mapping race and reworks the irqdomain locking so
: that in the end the global irq_domain_mutex is only used for managing
: the likewise global irq_domain_list, while domain operations (e.g. IRQ
: allocations) use per-domain (hierarchy) locking."
: .
irqdomain: Switch to per-domain locking
irqchip/mvebu-odmi: Use irq_domain_create_hierarchy()
irqchip/loongson-pch-msi: Use irq_domain_create_hierarchy()
irqchip/gic-v3-mbi: Use irq_domain_create_hierarchy()
irqchip/gic-v3-its: Use irq_domain_create_hierarchy()
irqchip/gic-v2m: Use irq_domain_create_hierarchy()
irqchip/alpine-msi: Use irq_domain_add_hierarchy()
x86/uv: Use irq_domain_create_hierarchy()
x86/ioapic: Use irq_domain_create_hierarchy()
irqdomain: Clean up irq_domain_push/pop_irq()
irqdomain: Drop leftover brackets
irqdomain: Drop dead domain-name assignment
irqdomain: Drop revmap mutex
irqdomain: Fix domain registration race
irqdomain: Fix mapping-creation race
irqdomain: Refactor __irq_domain_alloc_irqs()
irqdomain: Look for existing mapping only once
irqdomain: Drop bogus fwspec-mapping error handling
irqdomain: Fix disassociation race
irqdomain: Fix association race
Signed-off-by: Marc Zyngier <maz@kernel.org>
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The IRQ domain structures are currently protected by the global
irq_domain_mutex. Switch to using more fine-grained per-domain locking,
which can speed up parallel probing by reducing lock contention.
On a recent arm64 laptop, the total time spent waiting for the locks
during boot drops from 160 to 40 ms on average, while the maximum
aggregate wait time drops from 550 to 90 ms over ten runs for example.
Note that the domain lock of the root domain (innermost domain) must be
used for hierarchical domains. For non-hierarchical domains (as for root
domains), the new root pointer is set to the domain itself so that
&domain->root->mutex always points to the right lock.
Also note that hierarchical domains should be constructed using
irq_domain_create_hierarchy() (or irq_domain_add_hierarchy()) to avoid
having racing allocations access a not fully initialised domain. As a
safeguard, the lockdep assertion in irq_domain_set_mapping() will catch
any offenders that also fail to set the root domain pointer.
Tested-by: Hsin-Yi Wang <hsinyi@chromium.org>
Tested-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230213104302.17307-21-johan+linaro@kernel.org
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The irq_domain_push_irq() interface is used to add a new (outmost) level
to a hierarchical domain after IRQs have been allocated.
Possibly due to differing mental images of hierarchical domains, the
names used for the irq_data variables make these functions much harder
to understand than what they need to be.
Rename the struct irq_data pointer to the data embedded in the
descriptor as simply 'irq_data' and refer to the data allocated by this
interface as 'parent_irq_data' so that the names reflect how
hierarchical domains are implemented.
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Hsin-Yi Wang <hsinyi@chromium.org>
Tested-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230213104302.17307-12-johan+linaro@kernel.org
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Drop some unnecessary brackets that were left in place when the
corresponding code was updated.
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Hsin-Yi Wang <hsinyi@chromium.org>
Tested-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230213104302.17307-11-johan+linaro@kernel.org
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Since commit d59f6617eef0 ("genirq: Allow fwnode to carry name
information only") an IRQ domain is always given a name during
allocation (e.g. used for the debugfs entry).
Drop the leftover name assignment when allocating the first IRQ.
Tested-by: Hsin-Yi Wang <hsinyi@chromium.org>
Tested-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230213104302.17307-10-johan+linaro@kernel.org
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The revmap mutex is essentially only used to maintain the integrity of
the radix tree during updates (lookups use RCU).
As the global irq_domain_mutex is now held in all paths that update the
revmap structures there is strictly no longer any need for the dedicated
mutex, which can be removed.
Drop the revmap mutex and add lockdep assertions to the revmap helpers
to make sure that the global lock is always held when updating the
revmap.
Tested-by: Hsin-Yi Wang <hsinyi@chromium.org>
Tested-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230213104302.17307-9-johan+linaro@kernel.org
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Hierarchical domains created using irq_domain_create_hierarchy() are
currently added to the domain list before having been fully initialised.
This specifically means that a racing allocation request might fail to
allocate irq data for the inner domains of a hierarchy in case the
parent domain pointer has not yet been set up.
Note that this is not really any issue for irqchip drivers that are
registered early (e.g. via IRQCHIP_DECLARE() or IRQCHIP_ACPI_DECLARE())
but could potentially cause trouble with drivers that are registered
later (e.g. modular drivers using IRQCHIP_PLATFORM_DRIVER_BEGIN(),
gpiochip drivers, etc.).
Fixes: afb7da83b9f4 ("irqdomain: Introduce helper function irq_domain_add_hierarchy()")
Cc: stable@vger.kernel.org # 3.19
Signed-off-by: Marc Zyngier <maz@kernel.org>
[ johan: add commit message ]
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230213104302.17307-8-johan+linaro@kernel.org
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Parallel probing of devices that share interrupts (e.g. when a driver
uses asynchronous probing) can currently result in two mappings for the
same hardware interrupt to be created due to missing serialisation.
Make sure to hold the irq_domain_mutex when creating mappings so that
looking for an existing mapping before creating a new one is done
atomically.
Fixes: 765230b5f084 ("driver-core: add asynchronous probing support for drivers")
Fixes: b62b2cf5759b ("irqdomain: Fix handling of type settings for existing mappings")
Link: https://lore.kernel.org/r/YuJXMHoT4ijUxnRb@hovoldconsulting.com
Cc: stable@vger.kernel.org # 4.8
Cc: Dmitry Torokhov <dtor@chromium.org>
Cc: Jon Hunter <jonathanh@nvidia.com>
Tested-by: Hsin-Yi Wang <hsinyi@chromium.org>
Tested-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230213104302.17307-7-johan+linaro@kernel.org
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Refactor __irq_domain_alloc_irqs() so that it can be called internally
while holding the irq_domain_mutex.
This will be used to fix a shared-interrupt mapping race, hence the
Fixes tag.
Fixes: b62b2cf5759b ("irqdomain: Fix handling of type settings for existing mappings")
Cc: stable@vger.kernel.org # 4.8
Tested-by: Hsin-Yi Wang <hsinyi@chromium.org>
Tested-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230213104302.17307-6-johan+linaro@kernel.org
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Avoid looking for an existing mapping twice when creating a new mapping
using irq_create_fwspec_mapping() by factoring out the actual allocation
which is shared with irq_create_mapping_affinity().
The new helper function will also be used to fix a shared-interrupt
mapping race, hence the Fixes tag.
Fixes: b62b2cf5759b ("irqdomain: Fix handling of type settings for existing mappings")
Cc: stable@vger.kernel.org # 4.8
Tested-by: Hsin-Yi Wang <hsinyi@chromium.org>
Tested-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230213104302.17307-5-johan+linaro@kernel.org
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In case a newly allocated IRQ ever ends up not having any associated
struct irq_data it would not even be possible to dispose the mapping.
Replace the bogus disposal with a WARN_ON().
This will also be used to fix a shared-interrupt mapping race, hence the
CC-stable tag.
Fixes: 1e2a7d78499e ("irqdomain: Don't set type when mapping an IRQ")
Cc: stable@vger.kernel.org # 4.8
Tested-by: Hsin-Yi Wang <hsinyi@chromium.org>
Tested-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230213104302.17307-4-johan+linaro@kernel.org
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The global irq_domain_mutex is held when mapping interrupts from
non-hierarchical domains but currently not when disposing them.
This specifically means that updates of the domain mapcount is racy
(currently only used for statistics in debugfs).
Make sure to hold the global irq_domain_mutex also when disposing
mappings from non-hierarchical domains.
Fixes: 9dc6be3d4193 ("genirq/irqdomain: Add map counter")
Cc: stable@vger.kernel.org # 4.13
Tested-by: Hsin-Yi Wang <hsinyi@chromium.org>
Tested-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230213104302.17307-3-johan+linaro@kernel.org
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The sanity check for an already mapped virq is done outside of the
irq_domain_mutex-protected section which means that an (unlikely) racing
association may not be detected.
Fix this by factoring out the association implementation, which will
also be used in a follow-on change to fix a shared-interrupt mapping
race.
Fixes: ddaf144c61da ("irqdomain: Refactor irq_domain_associate_many()")
Cc: stable@vger.kernel.org # 3.11
Tested-by: Hsin-Yi Wang <hsinyi@chromium.org>
Tested-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230213104302.17307-2-johan+linaro@kernel.org
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Using __irq_domain_alloc_irqs() is an unnecessary complexity. Use
irq_domain_alloc_irqs(), which is simpler and makes the code more
readable.
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Marc Zyngier <maz@kernel.org>
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All RISC-V platforms have a single HW IPI provided by the INTC local
interrupt controller. The HW method to trigger INTC IPI can be through
external irqchip (e.g. RISC-V AIA), through platform specific device
(e.g. SiFive CLINT timer), or through firmware (e.g. SBI IPI call).
To support multiple IPIs on RISC-V, add a generic IPI multiplexing
mechanism which help us create multiple virtual IPIs using a single
HW IPI. This generic IPI multiplexing is inspired by the Apple AIC
irqchip driver and it is shared by various RISC-V irqchip drivers.
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Hector Martin <marcan@marcan.st>
Tested-by: Hector Martin <marcan@marcan.st>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230103141221.772261-4-apatel@ventanamicro.com
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group_cpus_evenly() has become a generic function which can be used for
other subsystems than the interrupt subsystem, so move it into lib/.
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Link: https://lore.kernel.org/r/20221227022905.352674-6-ming.lei@redhat.com
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Map irq vector into group, which allows to abstract the algorithm for
a generic use case outside of the interrupt core.
Rename irq_build_affinity_masks as group_cpus_evenly, so the API can be
reused for blk-mq to make default queue mapping even though irq vectors
aren't involved.
No functional change, just rename vector as group.
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Link: https://lore.kernel.org/r/20221227022905.352674-5-ming.lei@redhat.com
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Prepare for abstracting irq_build_affinity_masks() into a public function
for assigning all CPUs evenly into several groups.
Don't pass irq_affinity_desc array to irq_build_affinity_masks, instead
return a cpumask array by storing each assigned group into one element of
the array.
This allows to provide a generic interface for grouping all CPUs evenly
from a NUMA and CPU locality viewpoint, and the cost is one extra allocation
in irq_build_affinity_masks(), which should be fine since it is done via
GFP_KERNEL and irq_build_affinity_masks() is a slow path anyway.
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Link: https://lore.kernel.org/r/20221227022905.352674-4-ming.lei@redhat.com
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Pass affinity managed mask array to irq_build_affinity_masks() so that the
index of the first affinity managed vector is always zero.
This allows to simplify the implementation a bit.
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Link: https://lore.kernel.org/r/20221227022905.352674-3-ming.lei@redhat.com
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The 'firstvec' parameter is always same with the parameter of
'startvec', so use 'startvec' directly inside irq_build_affinity_masks().
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Link: https://lore.kernel.org/r/20221227022905.352674-2-ming.lei@redhat.com
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With the introduction of threaded interrupt handlers, it is virtually
never safe to call disable_irq() from non-premptible context.
Thus: Update the documentation, add an explicit might_sleep() to catch any
offenders. This is more obvious and straight forward than the implicit
might_sleep() check deeper down in the disable_irq() call chain.
Fixes: 3aa551c9b4c4 ("genirq: add threaded interrupt handler support")
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20221216150441.200533-3-manfred@colorfullife.com
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char/misc driver fixes from Greg KH:
"Here are a number of small char/misc/whatever driver fixes. They
include:
- IIO driver fixes for some reported problems
- nvmem driver fixes
- fpga driver fixes
- debugfs memory leak fix in the hv_balloon and irqdomain code
(irqdomain change was acked by the maintainer)
All have been in linux-next with no reported problems"
* tag 'char-misc-6.2-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (33 commits)
kernel/irq/irqdomain.c: fix memory leak with using debugfs_lookup()
HV: hv_balloon: fix memory leak with using debugfs_lookup()
nvmem: qcom-spmi-sdam: fix module autoloading
nvmem: core: fix return value
nvmem: core: fix cell removal on error
nvmem: core: fix device node refcounting
nvmem: core: fix registration vs use race
nvmem: core: fix cleanup after dev_set_name()
nvmem: core: remove nvmem_config wp_gpio
nvmem: core: initialise nvmem->id early
nvmem: sunxi_sid: Always use 32-bit MMIO reads
nvmem: brcm_nvram: Add check for kzalloc
iio: imu: fxos8700: fix MAGN sensor scale and unit
iio: imu: fxos8700: remove definition FXOS8700_CTRL_ODR_MIN
iio: imu: fxos8700: fix failed initialization ODR mode assignment
iio: imu: fxos8700: fix incorrect ODR mode readback
iio: light: cm32181: Fix PM support on system with 2 I2C resources
iio: hid: fix the retval in gyro_3d_capture_sample
iio: hid: fix the retval in accel_3d_capture_sample
iio: imu: st_lsm6dsx: fix build when CONFIG_IIO_TRIGGERED_BUFFER=m
...
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When calling debugfs_lookup() the result must have dput() called on it,
otherwise the memory will leak over time. To make things simpler, just
call debugfs_lookup_and_remove() instead which handles all of the logic
at once.
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: stable <stable@kernel.org>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230202151554.2310273-1-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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