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| author |   Barry Song <song.bao.hua@hisilicon.com> | 2021-08-25 18:26:34 +0800 |
|---|---|---|
| committer |   Bjorn Helgaas <bhelgaas@google.com> | 2021-10-18 16:16:28 -0500 |
| commit | 5e3be666f46b43169e80041657c4b63eaf1ae8de (patch) | |
| tree | f0a4a0b55d5f4db3fcaa113850d776c578afa24f | |
| parent | Linux 5.15-rc2 (diff) | |
| download | linux-dev-5e3be666f46b43169e80041657c4b63eaf1ae8de.tar.xz linux-dev-5e3be666f46b43169e80041657c4b63eaf1ae8de.zip | |
PCI: Document /sys/bus/pci/devices/.../irq
Document /sys/bus/pci/devices/.../irq.
This file contains the IRQ of the INTx interrupt (or zero if the device
doesn't support INTx interrupts).
If the device has enabled MSI (not MSI-X), it contains the first MSI IRQ
instead. This is a historical mistake because devices may support several
MSI or MSI-X vectors, and this file can't contain them all. But we
preserve this behavior to avoid breaking userspace.
[bhelgaas: commit log]
Link: https://lore.kernel.org/r/20210825102636.52757-2-21cnbao@gmail.com
Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-pci | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci index d4ae03296861..fef498c34fd9 100644 --- a/Documentation/ABI/testing/sysfs-bus-pci +++ b/Documentation/ABI/testing/sysfs-bus-pci @@ -96,6 +96,17 @@ Description: This attribute indicates the mode that the irq vector named by the file is in (msi vs. msix) +What: /sys/bus/pci/devices/.../irq +Date: August 2021 +Contact: Linux PCI developers <linux-pci@vger.kernel.org> +Description: + If a driver has enabled MSI (not MSI-X), "irq" contains the + IRQ of the first MSI vector. Otherwise "irq" contains the + IRQ of the legacy INTx interrupt. + + "irq" being set to 0 indicates that the device isn't + capable of generating legacy INTx interrupts. + What: /sys/bus/pci/devices/.../remove Date: January 2009 Contact: Linux PCI developers <linux-pci@vger.kernel.org> |