On Tue, Aug 31, 2021 at 8:08 PM Marc Zyngier <maz@xxxxxxxxxx> wrote:
>
> On 2021-08-31 02:21, Barry Song wrote:
> > On Mon, Aug 30, 2021 at 2:38 AM kernel test robot
> > <oliver.sang@xxxxxxxxx> wrote:
> >>
> >>
> >>
> >> Greeting,
> >>
> >> FYI, we noticed the following commit (built with gcc-9):
> >>
> >> commit: a4fc4cf388319ea957ffbdab5073bdd267de9082 ("[PATCH v3 3/3]
> >> PCI/MSI: remove msi_attrib.default_irq in msi_desc")
> >> url:
> >> https://github.com/0day-ci/linux/commits/Barry-Song/PCI-MSI-Clarify-the-IRQ-sysfs-ABI-for-PCI-devices/20210825-183018
> >> base: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git
> >> 6e764bcd1cf72a2846c0e53d3975a09b242c04c9
> >>
> >> in testcase: kernel-selftests
> >> version: kernel-selftests-x86_64-ebaa603b-1_20210825
> >> with following parameters:
> >>
> >> group: pidfd
> >> ucode: 0xe2
> >>
> >> test-description: The kernel contains a set of "self tests" under the
> >> tools/testing/selftests/ directory. These are intended to be small
> >> unit tests to exercise individual code paths in the kernel.
> >> test-url: https://www.kernel.org/doc/Documentation/kselftest.txt
> >>
> >>
> >> on test machine: 4 threads Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz
> >> with 32G memory
> >>
> >> caused below changes (please refer to attached dmesg/kmsg for entire
> >> log/backtrace):
> >>
> >>
> >>
> >> If you fix the issue, kindly add following tag
> >> Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
> >>
> >>
> >>
> >> [ 179.602028][ T34] genirq: Flags mismatch irq 16. 00002000
> >> (mei_me) vs. 00000000 (xhci_hcd)
> >> [ 179.614073][ T34] CPU: 2 PID: 34 Comm: kworker/u8:2 Not tainted
> >> 5.14.0-rc7-00014-ga4fc4cf38831 #1
> >> [ 179.623225][ T34] Hardware name: Dell Inc. OptiPlex 7040/0Y7WYT,
> >> BIOS 1.8.1 12/05/2017
> >> [ 179.631432][ T34] Workqueue: events_unbound async_run_entry_fn
> >> [ 179.637543][ T34] Call Trace:
> >> [ 179.640789][ T34] dump_stack_lvl+0x45/0x59
> >> [ 179.645253][ T34] __setup_irq.cold+0x50/0xd4
> >> [ 179.649893][ T34] ? mei_me_pg_exit_sync+0x480/0x480 [mei_me]
> >> [ 179.655923][ T34] request_threaded_irq+0x10c/0x180
> >> [ 179.661073][ T34] ? mei_me_irq_quick_handler+0x240/0x240
> >> [mei_me]
> >> [ 179.667528][ T34] mei_me_probe+0x131/0x300 [mei_me]
> >> [ 179.672767][ T34] local_pci_probe+0x42/0x80
> >> [ 179.677313][ T34] pci_device_probe+0x107/0x1c0
> >> [ 179.682118][ T34] really_probe+0xb6/0x380
> >> [ 179.687094][ T34] __driver_probe_device+0xfe/0x180
> >> [ 179.692242][ T34] driver_probe_device+0x1e/0xc0
> >> [ 179.697133][ T34] __driver_attach_async_helper+0x2b/0x80
> >> [ 179.702802][ T34] async_run_entry_fn+0x30/0x140
> >> [ 179.707693][ T34] process_one_work+0x274/0x5c0
> >> [ 179.712503][ T34] worker_thread+0x50/0x3c0
> >> [ 179.716959][ T34] ? process_one_work+0x5c0/0x5c0
> >> [ 179.721936][ T34] kthread+0x14f/0x180
> >> [ 179.725958][ T34] ? set_kthread_struct+0x40/0x40
> >> [ 179.730935][ T34] ret_from_fork+0x22/0x30
> >> [ 179.735699][ T34] mei_me 0000:00:16.0: request_threaded_irq
> >> failure. irq = 16
> >> [ 179.743125][ T34] mei_me 0000:00:16.0: initialization failed.
> >> [ 179.749399][ T34] mei_me: probe of 0000:00:16.0 failed with error
> >> -16
> >>
> >>
> >
> > it seems there is a direct reference to pdev->irq.
> > Hi Oliver, would you try if the below patch can fix the problem:
> >
> > diff --git a/drivers/misc/mei/pci-me.c b/drivers/misc/mei/pci-me.c
> > index c3393b383e59..a45a2d4257a6 100644
> > --- a/drivers/misc/mei/pci-me.c
> > +++ b/drivers/misc/mei/pci-me.c
> > @@ -216,7 +216,7 @@ static int mei_me_probe(struct pci_dev *pdev,
> > const struct pci_device_id *ent)
> >
> > pci_enable_msi(pdev);
> >
> > - hw->irq = pdev->irq;
> > + hw->irq = pci_irq_vector(pdev, 0);
> >
> > /* request and enable interrupt */
> > irqflags = pci_dev_msi_enabled(pdev) ? IRQF_ONESHOT :
> > IRQF_SHARED;
> >
>
> Ah! one victim, 3000 to go! :D
>
yep.
> That's exactly the kind of stuff I was mentioning when we
> discussed this patch. Exposing the MSI vector as the INTx
> IRQ has led to all sorts of broken drivers.
I guess drivers should depend on int pci_irq_vector(struct pci_dev
*dev, unsigned int nr)
rather than hardcodely use pdev->irq.
pci_irq_vector() supports all cases(intx, msi, msi-x)
>
> M.
> --
> Jazz is not dead. It just smells funny...
Thanks
barry
