From f146c7bc85a51f95c05e0f8173d484eb301ece78 Mon Sep 17 00:00:00 2001 From: Danilo Krummrich Date: Thu, 13 Aug 2026 18:52:04 +0200 Subject: PCI: Add pci_irq_type() to query the allocated interrupt type Add a helper that returns PCI_IRQ_MSIX, PCI_IRQ_MSI, or PCI_IRQ_INTX based on the interrupt type the PCI core selected after pci_alloc_irq_vectors(). Several drivers already open-code this check against pdev->msix_enabled and pdev->msi_enabled, or even open code this helper [1]. A common helper avoids the duplication and keeps drivers from accessing the bitfield directly (see also [2]). Acked-by: Bjorn Helgaas Tested-by: John Hubbard Link: https://elixir.bootlin.com/linux/v7.1/source/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c#L196 [1] Inspired-by: John Hubbard Link: https://lore.kernel.org/all/DKKG2QM3YJYB.Z2H2B2UXJ75N@kernel.org/ [2] Reviewed-by: Gary Guo Link: https://patch.msgid.link/20260813165234.620555-5-dakr@kernel.org [ Add missing pci_irq_type() stub for CONFIG_PCI=n. ] Signed-off-by: Danilo Krummrich --- Documentation/ABI/testing/sysfs-kernel-irq | 60 ++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-kernel-irq (limited to 'Documentation/ABI/testing/sysfs-kernel-irq') diff --git a/Documentation/ABI/testing/sysfs-kernel-irq b/Documentation/ABI/testing/sysfs-kernel-irq new file mode 100644 index 000000000..8910d0c4b --- /dev/null +++ b/Documentation/ABI/testing/sysfs-kernel-irq @@ -0,0 +1,60 @@ +What: /sys/kernel/irq +Date: September 2016 +KernelVersion: 4.9 +Contact: Craig Gallek +Description: Directory containing information about the system's IRQs. + Specifically, data from the associated struct irq_desc. + The information here is similar to that in /proc/interrupts + but in a more machine-friendly format. This directory contains + one subdirectory for each Linux IRQ number. + +What: /sys/kernel/irq//actions +Date: September 2016 +KernelVersion: 4.9 +Contact: Craig Gallek +Description: The IRQ action chain. A comma-separated list of zero or more + device names associated with this interrupt. + +What: /sys/kernel/irq//chip_name +Date: September 2016 +KernelVersion: 4.9 +Contact: Craig Gallek +Description: Human-readable chip name supplied by the associated device + driver. + +What: /sys/kernel/irq//hwirq +Date: September 2016 +KernelVersion: 4.9 +Contact: Craig Gallek +Description: When interrupt translation domains are used, this file contains + the underlying hardware IRQ number used for this Linux IRQ. + +What: /sys/kernel/irq//name +Date: September 2016 +KernelVersion: 4.9 +Contact: Craig Gallek +Description: Human-readable flow handler name as defined by the irq chip + driver. + +What: /sys/kernel/irq//per_cpu_count +Date: September 2016 +KernelVersion: 4.9 +Contact: Craig Gallek +Description: The number of times the interrupt has fired since boot. This + is a comma-separated list of counters; one per CPU in CPU id + order. NOTE: This file consistently shows counters for all + CPU ids. This differs from the behavior of /proc/interrupts + which only shows counters for online CPUs. + +What: /sys/kernel/irq//type +Date: September 2016 +KernelVersion: 4.9 +Contact: Craig Gallek +Description: The type of the interrupt. Either the string 'level' or 'edge'. + +What: /sys/kernel/irq//wakeup +Date: March 2018 +KernelVersion: 4.17 +Contact: Andy Shevchenko +Description: The wakeup state of the interrupt. Either the string + 'enabled' or 'disabled'. -- cgit v1.3.1