kernel/linux.git/include/linux/irqdesc.h, branch v6.6.132

genirq: Use hlist for managing resend handlers

2023-05-24T09:39:44+00:00

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 Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/r/20230519134902.1495562-2-sdonthineni@nvidia.com

genirq: Provide generic_handle_domain_irq_safe().

2022-09-19T13:08:38+00:00

commit 509853f9e1e7b ("genirq: Provide generic_handle_irq_safe()") addressed the problem of demultiplexing interrupt handlers which are force threaded on PREEMPT_RT enabled kernels which means that the demultiplexed handler is invoked with interrupts enabled which triggers a lockdep warning due to a non-irq safe lock acquisition. The same problem exists for the irq domain based interrupt handling via generic_handle_domain_irq() which has been reported against the AMD pin-ctrl driver. Provide generic_handle_domain_irq_safe() which can used from any context. [ tglx: Split the usage sites out and massaged changelog ] Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/r/YnkfWFzvusFFktSt@linutronix.de Link: https://bugzilla.kernel.org/show_bug.cgi?id=215954

genirq: Allow irq_set_chip_handler_name_locked() to take a const irq_chip

2022-07-11T09:12:49+00:00

Similar to commit 393e1280f765 ("genirq: Allow irq_chip registration functions to take a const irq_chip"), allow the irq_set_chip_handler_name_locked() function to take a const irq_chip argument. Signed-off-by: Michael Walle Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20220706151553.1580790-1-michael@walle.cc

genirq: Provide generic_handle_irq_safe()

2022-02-21T10:31:06+00:00

Provide generic_handle_irq_safe() which can used from any context. Suggested-by: Thomas Gleixner Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Thomas Gleixner Reviewed-by: Hans de Goede Reviewed-by: Oleksandr Natalenko Reviewed-by: Wolfram Sang Link: https://lore.kernel.org/r/20220211181500.1856198-2-bigeasy@linutronix.de

irq: remove handle_domain_{irq,nmi}()

2021-10-26T09:13:31+00:00

Now that entry code handles IRQ entry (including setting the IRQ regs) before calling irqchip code, irqchip code can safely call generic_handle_domain_irq(), and there's no functional reason for it to call handle_domain_irq(). Let's cement this split of responsibility and remove handle_domain_irq() entirely, updating irqchip drivers to call generic_handle_domain_irq(). For consistency, handle_domain_nmi() is similarly removed and replaced with a generic_handle_domain_nmi() function which also does not perform any entry logic. Previously handle_domain_{irq,nmi}() had a WARN_ON() which would fire when they were called in an inappropriate context. So that we can identify similar issues going forward, similar WARN_ON_ONCE() logic is added to the generic_handle_*() functions, and comments are updated for clarity and consistency. Signed-off-by: Mark Rutland Reviewed-by: Marc Zyngier Cc: Thomas Gleixner

genirq: Move non-irqdomain handle_domain_irq() handling into ARM's handle_IRQ()

2021-06-10T12:09:19+00:00

Despite the name, handle_domain_irq() deals with non-irqdomain handling for the sake of a handful of legacy ARM platforms. Move such handling into ARM's handle_IRQ(), allowing for better code generation for everyone else. This allows us get rid of some complexity, and to rearrange the guards on the various helpers in a more logical way. Signed-off-by: Marc Zyngier

genirq: Add generic_handle_domain_irq() helper

2021-06-10T12:09:19+00:00

Provide generic_handle_domain_irq() as a pendent to handle_domain_irq() for non-root interrupt controllers Signed-off-by: Marc Zyngier

irqdesc: Fix __handle_domain_irq() comment

2021-06-10T12:09:18+00:00

It appears that the comment about a NULL domain meaning anything has always been wrong. Fix it. Signed-off-by: Marc Zyngier

genirq: Use irq_resolve_mapping() to implement __handle_domain_irq() and co

2021-06-10T12:09:18+00:00

In order to start reaping the benefits of irq_resolve_mapping(), start using it in __handle_domain_irq() and handle_domain_nmi(). This involves splitting generic_handle_irq() to be able to directly provide the irq_desc. Signed-off-by: Marc Zyngier

irq: Fix typos in comments

2021-03-22T03:23:14+00:00

Fix ~36 single-word typos in the IRQ, irqchip and irqdomain code comments. Signed-off-by: Ingo Molnar Cc: Thomas Gleixner Cc: Marc Zyngier Cc: Borislav Petkov Cc: Peter Zijlstra Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar