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PCI: Document /sys/bus/pci/devices/.../irq

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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>
This commit is contained in:
Barry Song 2021-08-25 18:26:34 +08:00 committed by Bjorn Helgaas
parent e4e737bb5c
commit 5e3be666f4
1 changed files with 11 additions and 0 deletions
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@ -96,6 +96,17 @@ Description:
This attribute indicates the mode that the irq vector named by This attribute indicates the mode that the irq vector named by
the file is in (msi vs. msix) 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 What: /sys/bus/pci/devices/.../remove
Date: January 2009 Date: January 2009
Contact: Linux PCI developers <linux-pci@vger.kernel.org> Contact: Linux PCI developers <linux-pci@vger.kernel.org>