linux-kernel - Re: [PATCH 2/2] PCI: Ignore PCIe ports used for tunneling in pcie_bandwidth

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Message-ID: <202311010646.KCczSLIW-lkp@intel.com>
Date:   Wed, 1 Nov 2023 07:02:58 +0800
From:   kernel test robot <lkp@...el.com>
To:     Mario Limonciello <mario.limonciello@....com>, bhelgaas@...gle.com,
        mika.westerberg@...ux.intel.com
Cc:     oe-kbuild-all@...ts.linux.dev, andreas.noever@...il.com,
        michael.jamet@...el.com, YehezkelShB@...il.com,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, Alexander.Deucher@....com,
        Mario Limonciello <mario.limonciello@....com>
Subject: Re: [PATCH 2/2] PCI: Ignore PCIe ports used for tunneling in
 pcie_bandwidth_available()

Hi Mario,

kernel test robot noticed the following build warnings:

[auto build test WARNING on pci/for-linus]
[also build test WARNING on westeri-thunderbolt/next linus/master v6.6 next-20231031]
[cannot apply to pci/next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Mario-Limonciello/PCI-Ignore-PCIe-ports-used-for-tunneling-in-pcie_bandwidth_available/20231031-224221
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git for-linus
patch link:    https://lore.kernel.org/r/20231031133438.5299-2-mario.limonciello%40amd.com
patch subject: [PATCH 2/2] PCI: Ignore PCIe ports used for tunneling in pcie_bandwidth_available()
config: arc-randconfig-002-20231101 (https://download.01.org/0day-ci/archive/20231101/202311010646.KCczSLIW-lkp@intel.com/config)
compiler: arc-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231101/202311010646.KCczSLIW-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311010646.KCczSLIW-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/pci/pci.c:6234: warning: Function parameter or member 'pdev' not described in 'pcie_is_tunneling_port'
>> drivers/pci/pci.c:6234: warning: Excess function parameter 'dev' description in 'pcie_is_tunneling_port'

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for VIDEO_OV7670
   Depends on [n]: MEDIA_SUPPORT [=y] && VIDEO_DEV [=y] && VIDEO_CAMERA_SENSOR [=n]
   Selected by [y]:
   - VIDEO_CAFE_CCIC [=y] && MEDIA_SUPPORT [=y] && MEDIA_PLATFORM_SUPPORT [=y] && MEDIA_PLATFORM_DRIVERS [=y] && V4L_PLATFORM_DRIVERS [=y] && PCI [=y] && I2C [=y] && VIDEO_DEV [=y] && COMMON_CLK [=y]


vim +6234 drivers/pci/pci.c

  6225	
  6226	/**
  6227	 * pcie_is_tunneling_port - Check if a PCI device is used for TBT3/USB4 tunneling
  6228	 * @dev: PCI device to check
  6229	 *
  6230	 * Returns true if the device is used for PCIe tunneling, false otherwise.
  6231	 */
  6232	static bool
  6233	pcie_is_tunneling_port(struct pci_dev *pdev)
> 6234	{
  6235		struct device_link *link;
  6236		struct pci_dev *supplier;
  6237	
  6238		/* Intel TBT3 bridge */
  6239		if (pdev->is_thunderbolt)
  6240			return true;
  6241	
  6242		if (!pci_is_pcie(pdev))
  6243			return false;
  6244	
  6245		if (pci_pcie_type(pdev) != PCI_EXP_TYPE_ROOT_PORT)
  6246			return false;
  6247	
  6248		/* PCIe root port used for tunneling linked to USB4 router */
  6249		list_for_each_entry(link, &pdev->dev.links.suppliers, c_node) {
  6250			supplier = to_pci_dev(link->supplier);
  6251			if (!supplier)
  6252				continue;
  6253			if (supplier->class == PCI_CLASS_SERIAL_USB_USB4)
  6254				return true;
  6255		}
  6256	
  6257		return false;
  6258	}
  6259	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki