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SubjectRe: [PATCH] pci: fix unavailable irq number 255 reported by BIOS
Date
On Tuesday, January 19, 2016 09:45:13 AM Chen Fan wrote:
> In our environment, when enable Secure boot, we found an abnormal
> phenomenon as following call trace shows. after investigation, we
> found the firmware assigned an irq number 255 which means unknown
> or no connection in PCI local spec for i801_smbus, meanwhile the
> ACPI didn't configure the pci irq routing. and the 255 irq number
> was assigned for megasa msix without IRQF_SHARED. then in this case
> during i801_smbus probe, the i801_smbus driver would request irq with
> bad irq number 255. but the 255 irq number was assigned for memgasa
> with MSIX enable. which will cause request_irq fails, and call trace
> shows, actually, we should expose the error early, rather than in request
> irq, here we simply fix the problem by return err when find the irq is
> 255.
>
> See the call trace:
>
> [ 32.459195] ipmi device interface
> [ 32.612907] shpchp: Standard Hot Plug PCI Controller Driver version: 0.4
> [ 32.800459] ixgbe: Intel(R) 10 Gigabit PCI Express Network Driver - version 4.0.1-k-rh
> [ 32.818319] ixgbe: Copyright (c) 1999-2014 Intel Corporation.
> [ 32.844009] lpc_ich 0001:80:1f.0: I/O space for ACPI uninitialized
> [ 32.850093] i801_smbus 0000:00:1f.3: enabling device (0140 -> 0143)
> [ 32.851134] i801_smbus 0000:00:1f.3: can't derive routing for PCI INT C
> [ 32.851136] i801_smbus 0000:00:1f.3: PCI INT C: no GSI
> [ 32.851164] genirq: Flags mismatch irq 255. 00000080 (i801_smbus) vs. 00000000 (megasa
> [ 32.851168] CPU: 0 PID: 2487 Comm: kworker/0:1 Not tainted 3.10.0-229.el7.x86_64 #1
> [ 32.851170] Hardware name: FUJITSU PRIMEQUEST 2800E2/D3736, BIOS PRIMEQUEST 2000 Serie5
> [ 32.851178] Workqueue: events work_for_cpu_fn
> [ 32.851208] ffff88086c330b00 00000000e233a9df ffff88086d57bca0 ffffffff81603f36
> [ 32.851227] ffff88086d57bcf8 ffffffff8110d23a ffff88686fe02000 0000000000000246
> [ 32.851246] ffff88086a9a8c00 00000000e233a9df ffffffffa00ad220 0000000000000080
> [ 32.851247] Call Trace:
> [ 32.851261] [<ffffffff81603f36>] dump_stack+0x19/0x1b
> [ 32.851271] [<ffffffff8110d23a>] __setup_irq+0x54a/0x570
> [ 32.851282] [<ffffffffa00ad220>] ? i801_check_pre.isra.5+0xe0/0xe0 [i2c_i801]
> [ 32.851289] [<ffffffff8110d3bc>] request_threaded_irq+0xcc/0x170
> [ 32.851298] [<ffffffffa00ae87f>] i801_probe+0x32f/0x508 [i2c_i801]
> [ 32.851308] [<ffffffff81308385>] local_pci_probe+0x45/0xa0
> [ 32.851315] [<ffffffff8108bfd4>] work_for_cpu_fn+0x14/0x20
> [ 32.851323] [<ffffffff8108f0ab>] process_one_work+0x17b/0x470
> [ 32.851330] [<ffffffff81090003>] worker_thread+0x293/0x400
> [ 32.851338] [<ffffffff8108fd70>] ? rescuer_thread+0x400/0x400
> [ 32.851346] [<ffffffff8109726f>] kthread+0xcf/0xe0
> [ 32.851353] [<ffffffff810971a0>] ? kthread_create_on_node+0x140/0x140
> [ 32.851362] [<ffffffff81613cfc>] ret_from_fork+0x7c/0xb0
> [ 32.851369] [<ffffffff810971a0>] ? kthread_create_on_node+0x140/0x140
> [ 32.851373] i801_smbus 0000:00:1f.3: Failed to allocate irq 255: -16
> [ 32.851435] i801_smbus: probe of 0000:00:1f.3 failed with error -16
> [ 33.180145] ixgbe 0000:5a:00.0: Multiq[ 33.240538] ixgbe 0000:5a:00.0: (PCI Express:03:e0
> [ 33.280826] ixgbe 0000:5a:00.0: MAC: 3, PHY: 0, PBA No: 000000-000
>
> Signed-off-by: Chen Fan <chen.fan.fnst@cn.fujitsu.com>
> ---
> drivers/acpi/pci_irq.c | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
> index d30184c..d2f47f8 100644
> --- a/drivers/acpi/pci_irq.c
> +++ b/drivers/acpi/pci_irq.c
> @@ -439,9 +439,17 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
> if (acpi_isa_register_gsi(dev))
> dev_warn(&dev->dev, "PCI INT %c: no GSI\n",
> pin_name(pin));
> + rc = 0;
> + /*
> + * Excluding the BIOS report the value 255, which meaning
> + * "unknown" or "no connection" in PCI Local Bus Specification
> + * Revision 3.0 February 3, 2004, P223.

You mean the footnote on page 223 talking about the Interrupt Line values, right?

> + */
> + if (dev->irq == 0xFF)
> + rc = -EINVAL;
>
> kfree(entry);
> - return 0;
> + return rc;
> }
>
> rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity);
>

Well, if you look at acpi_isa_register_gsi(), you'll see that it
actually does the check you're adding, so maybe the following should
be done instead?

---
drivers/acpi/pci_irq.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

Index: linux-pm/drivers/acpi/pci_irq.c
===================================================================
--- linux-pm.orig/drivers/acpi/pci_irq.c
+++ linux-pm/drivers/acpi/pci_irq.c
@@ -436,12 +436,13 @@ int acpi_pci_irq_enable(struct pci_dev *
* driver reported one, then use it. Exit in any case.
*/
if (gsi < 0) {
- if (acpi_isa_register_gsi(dev))
+ rc = acpi_isa_register_gsi(dev);
+ if (rc)
dev_warn(&dev->dev, "PCI INT %c: no GSI\n",
pin_name(pin));

kfree(entry);
- return 0;
+ return rc;
}

rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity);

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