From 7570a333d8b00e7fd4b05d898e353000a70210ce Mon Sep 17 00:00:00 2001 From: MUNEDA Takahiro Date: Thu, 2 Feb 2012 11:09:22 -0500 Subject: PCI: Add pcie_hp=nomsi to disable MSI/MSI-X for pciehp driver Add a parameter to avoid using MSI/MSI-X for PCIe native hotplug; it's known to be buggy on some platforms. In my environment, while shutting down, following stack trace is shown sometimes. irq 16: nobody cared (try booting with the "irqpoll" option) Pid: 1081, comm: reboot Not tainted 3.2.0 #1 Call Trace: [] __report_bad_irq+0x3d/0xe0 [] note_interrupt+0x15c/0x210 [] handle_irq_event_percpu+0xb5/0x210 [] handle_irq_event+0x41/0x70 [] handle_fasteoi_irq+0x55/0xc0 [] handle_irq+0x46/0xb0 [] do_IRQ+0x5d/0xe0 [] common_interrupt+0x6e/0x6e [] ? __do_softirq+0x60/0x210 [] ? hrtimer_interrupt+0x151/0x240 [] call_softirq+0x1c/0x30 [] do_softirq+0x65/0xa0 [] irq_exit+0xbd/0xe0 [] smp_apic_timer_interrupt+0x6e/0x99 [] apic_timer_interrupt+0x6e/0x80 [] ? _raw_spin_unlock_irqrestore+0x11/0x20 [] pci_bus_write_config_word+0x6c/0x80 [] pci_intx+0x52/0xa0 [] pci_intx_for_msi+0x1d/0x30 [] pci_msi_shutdown+0x7b/0x110 [] pci_device_shutdown+0x34/0x50 [] device_shutdown+0x2f/0x140 [] kernel_restart_prepare+0x31/0x40 [] kernel_restart+0x16/0x60 [] sys_reboot+0x1ad/0x220 [] ? do_page_fault+0x1e0/0x460 [] ? __sync_filesystem+0x90/0x90 [] ? __cond_resched+0x2a/0x40 [] ? _cond_resched+0x30/0x40 [] ? iterate_supers+0xb7/0xd0 [] system_call_fastpath+0x16/0x1b handlers: [] usb_hcd_irq [] usb_hcd_irq [] usb_hcd_irq Disabling IRQ #16 An un-wanted interrupt is generated when PCI driver switches from MSI/MSI-X to INTx while shutting down the device. The interrupt does not happen if MSI/MSI-X is not used on the device. I confirmed that this problem does not happen if pcie_hp=nomsi was specified and hotplug operation worked fine as usual. v2: Automatically disable MSI/MSI-X against following device: PCI bridge: Integrated Device Technology, Inc. Device 807f (rev 02) v3: Based on the review comment, combile the if statements. v4: Removed module parameter. Move some code to build pciehp as a module. Move device specific code to driver/pci/quirks.c. v5: Drop a device specific code until getting a vendor statement. Reviewed-by: Kenji Kaneshige Signed-off-by: MUNEDA Takahiro Signed-off-by: Jesse Barnes --- Documentation/kernel-parameters.txt | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'Documentation/kernel-parameters.txt') diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 033d4e69b43b..7fb7a4b161ff 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -2118,6 +2118,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted. force Enable ASPM even on devices that claim not to support it. WARNING: Forcing ASPM on may cause system lockups. + pcie_hp= [PCIE] PCI Express Hotplug driver options: + nomsi Do not use MSI for PCI Express Native Hotplug (this + makes all PCIe ports use INTx for hotplug services). + pcie_ports= [PCIE] PCIe ports handling: auto Ask the BIOS whether or not to use native PCIe services associated with PCIe ports (PME, hot-plug, AER). Use -- cgit v1.2.3