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2021-08-11genirq: Fix kernel-doc warnings in pm.c, msi.c and ipi.cRandy Dunlap1-16/+16
Fix all kernel-doc warnings in these 3 files and do some simple editing (capitalize acronyms, capitalize Linux). kernel/irq/pm.c:235: warning: expecting prototype for irq_pm_syscore_ops(). Prototype was for irq_pm_syscore_resume() instead kernel/irq/msi.c:530: warning: expecting prototype for __msi_domain_free_irqs(). Prototype was for msi_domain_free_irqs() instead kernel/irq/msi.c:31: warning: No description found for return value of 'alloc_msi_entry' kernel/irq/msi.c:103: warning: No description found for return value of 'msi_domain_set_affinity' kernel/irq/msi.c:288: warning: No description found for return value of 'msi_create_irq_domain' kernel/irq/msi.c:499: warning: No description found for return value of 'msi_domain_alloc_irqs' kernel/irq/msi.c:545: warning: No description found for return value of 'msi_get_domain_info' kernel/irq/ipi.c:264: warning: expecting prototype for ipi_send_mask(). Prototype was for __ipi_send_mask() instead kernel/irq/ipi.c:25: warning: No description found for return value of 'irq_reserve_ipi' kernel/irq/ipi.c:116: warning: No description found for return value of 'irq_destroy_ipi' kernel/irq/ipi.c:163: warning: No description found for return value of 'ipi_get_hwirq' kernel/irq/ipi.c:222: warning: No description found for return value of '__ipi_send_single' kernel/irq/ipi.c:308: warning: No description found for return value of 'ipi_send_single' kernel/irq/ipi.c:329: warning: No description found for return value of 'ipi_send_mask' Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/20210810234835.12547-1-rdunlap@infradead.org
2021-03-16genirq: Fix typos and misspellings in commentsKrzysztof Kozlowski1-1/+1
No functional change. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/20210316100205.23492-1-krzysztof.kozlowski@canonical.com
2018-12-18genirq: Fix various typos in commentsIngo Molnar1-2/+2
Go over the IRQ subsystem source code (including irqchip drivers) and fix common typos in comments. No change in functionality intended. Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: linux-kernel@vger.kernel.org
2018-03-20genirq: Add missing SPDX identifiersThomas Gleixner1-0/+1
Add SPDX identifiers to files - which contain an explicit license boiler plate or reference - which do not contain a license reference and were not updated in the initial SPDX conversion because the license was deduced by the scanners via EXPORT_SYMBOL_GPL as GPL2.0 only. [ tglx: Moved adding identifiers from the patch which removes the references/boilerplate ] Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Kate Stewart <kstewart@linuxfoundation.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Philippe Ombredanne <pombredanne@nexb.com> Link: https://lkml.kernel.org/r/20180314212030.668321222@linutronix.de
2018-03-20genirq: Cleanup top of file commentsThomas Gleixner1-2/+0
Remove pointless references to the file name itself and condense the information so it wastes less space. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Cc: Kate Stewart <kstewart@linuxfoundation.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Philippe Ombredanne <pombredanne@nexb.com> Link: https://lkml.kernel.org/r/20180314212030.412095827@linutronix.de
2017-08-20genirq/ipi: Fixup checks against nr_cpu_idsAlexey Dobriyan1-2/+2
Valid CPU ids are [0, nr_cpu_ids-1] inclusive. Fixes: 3b8e29a82dd1 ("genirq: Implement ipi_send_mask/single()") Fixes: f9bce791ae2a ("genirq: Add a new function to get IPI reverse mapping") Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/20170819095751.GB27864@avx2
2016-07-19genirq: Fix missing irq allocation affinity hintVincent Stehle1-1/+1
The new affinity hint argument of __irq_domain_alloc_irqs() is missing in irq_reserve_ipi(). Add it. This fixes the following compilation error: kernel/irq/ipi.c: In function ‘irq_reserve_ipi’: kernel/irq/ipi.c:85:9: error: too few arguments to function ‘__irq_domain_alloc_irqs’ virq = __irq_domain_alloc_irqs(domain, virq, nr_irqs, NUMA_NO_NODE, ^ Fixes: 06ee6d571f0e ("genirq: Add affinity hint to irq allocation") Signed-off-by: Vincent Stehlé <vincent.stehle@laposte.net> Cc: linux-pci@vger.kernel.org Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2016-07-04genirq: Add affinity hint to irq allocationThomas Gleixner1-1/+1
Add an extra argument to the irq(domain) allocation functions, so we can hand down affinity hints to the allocator. Thats necessary to implement proper support for multiqueue devices. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Christoph Hellwig <hch@lst.de> Cc: linux-block@vger.kernel.org Cc: linux-pci@vger.kernel.org Cc: linux-nvme@lists.infradead.org Cc: axboe@fb.com Cc: agordeev@redhat.com Link: http://lkml.kernel.org/r/1467621574-8277-4-git-send-email-hch@lst.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2016-05-24genirq: Fix missing return value in irq_destroy_ipi()Matt Redfearn1-1/+1
Commit 7cec18a3906b changed the return type of irq_destroy_ipi to int, but missed adding a value to one return statement. Fix this to silence the resulting compiler warning: kernel/irq/ipi.c In function ‘irq_destroy_ipi’: kernel/irq/ipi.c:128:3: warning: ‘return’ with no value, in function returning non-void [-Wreturn-type] Fixes: 7cec18a3906b "genirq: Add error code reporting to irq_{reserve,destroy}_ipi" Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com> Cc: linux-mips@linux-mips.org Link: http://lkml.kernel.org/r/1464086550-24734-1-git-send-email-matt.redfearn@imgtec.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2016-05-02genirq: Add error code reporting to irq_{reserve,destroy}_ipiMatt Redfearn1-14/+17
Make these functions return appropriate error codes when something goes wrong. Previously irq_destroy_ipi returned void making it impossible to notify the caller if the request could not be fulfilled. Patch 1 in the series added another condition in which this could fail in addition to the existing ones. irq_reserve_ipi returned an unsigned int meaning it could only return 0 on failure and give the caller no indication as to why the request failed. As time goes on there are likely to be further conditions added in which these functions can fail. These APIs and the IPI IRQ domain are new in 4.6 and the number of existing call sites are low, changing the API now has little impact on the code, while making it easier for these functions to grow over time. Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com> Cc: linux-mips@linux-mips.org Cc: jason@lakedaemon.net Cc: marc.zyngier@arm.com Cc: ralf@linux-mips.org Cc: Qais Yousef <qsyousef@gmail.com> Cc: lisa.parratt@imgtec.com Cc: jiang.liu@linux.intel.com Link: http://lkml.kernel.org/r/1461568464-31701-2-git-send-email-matt.redfearn@imgtec.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2016-05-02genirq: Make irq_destroy_ipi take a cpumask of IPIs to destroyMatt Redfearn1-4/+14
Previously irq_destroy_ipi() would destroy IPIs to all CPUs that were configured by irq_reserve_ipi(). This change makes it possible to destroy just a subset of the IPIs. This may be useful to remove IPIs to CPUs that have been hot removed so that the IRQ numbers allocated within the IPI domain can be re-used. The original behaviour is restored by passing the complete mask that the IPI was created with. There are currently no users of this function that would break from the API change. Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com> Cc: linux-mips@linux-mips.org Cc: jason@lakedaemon.net Cc: marc.zyngier@arm.com Cc: ralf@linux-mips.org Cc: Qais Yousef <qsyousef@gmail.com> Cc: lisa.parratt@imgtec.com Cc: jiang.liu@linux.intel.com Link: http://lkml.kernel.org/r/1461568464-31701-1-git-send-email-matt.redfearn@imgtec.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2016-04-21genirq: Dont allow affinity mask to be updated on IPIsMatt Redfearn1-0/+1
The IPI domain re-purposes the IRQ affinity to signify the mask of CPUs that this IPI will deliver to. This must not be modified before the IPI is destroyed again, so set the IRQ_NO_BALANCING flag to prevent the affinity being overwritten by setup_affinity(). Without this, if an IPI is reserved for a single target CPU, then allocated using __setup_irq(), the affinity is overwritten with cpu_online_mask. When ipi_destroy() is subsequently called on a multi-cpu system, it will attempt to free cpumask_weight() IRQs that were never allocated, and crash. Fixes: d17bf24e6952 ("genirq: Add a new generic IPI reservation code to irq core") Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com> Cc: linux-mips@linux-mips.org Cc: jason@lakedaemon.net Cc: marc.zyngier@arm.com Cc: ralf@linux-mips.org Cc: Qais Yousef <qsyousef@gmail.com> Cc: lisa.parratt@imgtec.com Link: http://lkml.kernel.org/r/1461229712-13057-1-git-send-email-matt.redfearn@imgtec.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2016-02-25genirq: Implement ipi_send_mask/single()Qais Yousef1-1/+156
Add APIs to send IPIs from driver and arch code. We have different functions because we allow architecture code to cache the irq descriptor to avoid lookups. Driver code has to use the irq number and is subject to more restrictive checks. [ tglx: Polish the implementation ] Signed-off-by: Qais Yousef <qais.yousef@imgtec.com> Cc: <jason@lakedaemon.net> Cc: <marc.zyngier@arm.com> Cc: <jiang.liu@linux.intel.com> Cc: <ralf@linux-mips.org> Cc: <linux-mips@linux-mips.org> Cc: <lisa.parratt@imgtec.com> Cc: Qais Yousef <qsyousef@gmail.com> Link: http://lkml.kernel.org/r/1449580830-23652-12-git-send-email-qais.yousef@imgtec.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2016-02-25genirq: Add a new function to get IPI reverse mappingQais Yousef1-0/+34
When dealing with coprocessors we need to find out the actual hwirqs values to pass on to the firmware so that it knows what it needs to use to receive IPIs from and send IPIs to Linux cpus. [ tglx: Fixed the single hwirq IPI case. The hardware irq number does not change due to the cpu number ] Signed-off-by: Qais Yousef <qais.yousef@imgtec.com> Cc: <jason@lakedaemon.net> Cc: <marc.zyngier@arm.com> Cc: <jiang.liu@linux.intel.com> Cc: <ralf@linux-mips.org> Cc: <linux-mips@linux-mips.org> Cc: <lisa.parratt@imgtec.com> Cc: Qais Yousef <qsyousef@gmail.com> Link: http://lkml.kernel.org/r/1449580830-23652-10-git-send-email-qais.yousef@imgtec.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2016-02-25genirq: Add a new generic IPI reservation code to irq coreQais Yousef1-0/+137
Add a generic mechanism to dynamically allocate an IPI. Depending on the underlying implementation this creates either a single Linux irq or a consective range of Linux irqs. The Linux irq is used later to send IPIs to other CPUs. [ tglx: Massaged the code and removed the 'consecutive mask' restriction for the single IRQ case ] Signed-off-by: Qais Yousef <qais.yousef@imgtec.com> Cc: <jason@lakedaemon.net> Cc: <marc.zyngier@arm.com> Cc: <jiang.liu@linux.intel.com> Cc: <ralf@linux-mips.org> Cc: <linux-mips@linux-mips.org> Cc: <lisa.parratt@imgtec.com> Cc: Qais Yousef <qsyousef@gmail.com> Link: http://lkml.kernel.org/r/1449580830-23652-9-git-send-email-qais.yousef@imgtec.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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