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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1553934

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1553934

Title:
  xenial: 'msi_irqs' directory isn't show under pci device capable of
  MSI

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  When I test xenial kernel about PCI function on one ARM64 box,  I see
  the PCI device does work, and this device is shown with MSI capability.

  But the msi_irqs directory can't be found under:

  ./platform/soc/1f2b0000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/

  When I trace the kernel and I found populate_msi_sysfs() is run successfully
  from this path(pci_enable_msi), but it looks weird.

  
  [1] lspci: 
  01:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5722
  Gigabit Ethernet PCI Express
      Subsystem: Broadcom Corporation NetXtreme BCM5722 Gigabit Ethernet
  PCI Express
      Flags: bus master, fast devsel, latency 0, IRQ 93
      Memory at c140000000 (64-bit, non-prefetchable) [size=64K]
      Capabilities: [48] Power Management version 3
      Capabilities: [50] Vital Product Data
      Capabilities: [58] Vendor Specific Information: Len=78 <?>
      Capabilities: [e8] MSI: Enable- Count=1/1 Maskable- 64bit+
      Capabilities: [d0] Express Endpoint, MSI 00
      Capabilities: [100] Advanced Error Reporting
      Capabilities: [13c] Virtual Channel
      Capabilities: [160] Device Serial Number 00-10-18-ff-fe-55-33-0d
      Capabilities: [16c] Power Budgeting <?>
      Kernel driver in use: tg3

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