On Thu, 2 Feb 2012 11:09:22 -0500,
MUNEDA Takahiro <muneda.takahiro@xxxxxxxxxxxxxx> wrote:
> Not to use MSI/MSI-X for pciehp, add a kernel parameter, pcie_hp=nomsi.
>
> 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:
> <IRQ> [<ffffffff810cec1d>] __report_bad_irq+0x3d/0xe0
> [<ffffffff810cee1c>] note_interrupt+0x15c/0x210
> [<ffffffff810cc485>] handle_irq_event_percpu+0xb5/0x210
> [<ffffffff810cc621>] handle_irq_event+0x41/0x70
> [<ffffffff810cf675>] handle_fasteoi_irq+0x55/0xc0
> [<ffffffff81015356>] handle_irq+0x46/0xb0
> [<ffffffff814fbe9d>] do_IRQ+0x5d/0xe0
> [<ffffffff814f146e>] common_interrupt+0x6e/0x6e
> [<ffffffff8106b040>] ? __do_softirq+0x60/0x210
> [<ffffffff8108aeb1>] ? hrtimer_interrupt+0x151/0x240
> [<ffffffff814fb5ec>] call_softirq+0x1c/0x30
> [<ffffffff810152d5>] do_softirq+0x65/0xa0
> [<ffffffff8106ae9d>] irq_exit+0xbd/0xe0
> [<ffffffff814fbf8e>] smp_apic_timer_interrupt+0x6e/0x99
> [<ffffffff814f9e5e>] apic_timer_interrupt+0x6e/0x80
> <EOI> [<ffffffff814f0fb1>] ? _raw_spin_unlock_irqrestore+0x11/0x20
> [<ffffffff812629fc>] pci_bus_write_config_word+0x6c/0x80
> [<ffffffff81266fc2>] pci_intx+0x52/0xa0
> [<ffffffff8127de3d>] pci_intx_for_msi+0x1d/0x30
> [<ffffffff8127e4fb>] pci_msi_shutdown+0x7b/0x110
> [<ffffffff81269d34>] pci_device_shutdown+0x34/0x50
> [<ffffffff81326c4f>] device_shutdown+0x2f/0x140
> [<ffffffff8107b981>] kernel_restart_prepare+0x31/0x40
> [<ffffffff8107b9e6>] kernel_restart+0x16/0x60
> [<ffffffff8107bbfd>] sys_reboot+0x1ad/0x220
> [<ffffffff814f4b90>] ? do_page_fault+0x1e0/0x460
> [<ffffffff811942d0>] ? __sync_filesystem+0x90/0x90
> [<ffffffff8105c9aa>] ? __cond_resched+0x2a/0x40
> [<ffffffff814ef090>] ? _cond_resched+0x30/0x40
> [<ffffffff81169e17>] ? iterate_supers+0xb7/0xd0
> [<ffffffff814f9382>] system_call_fastpath+0x16/0x1b
> handlers:
> [<ffffffff8138a0f0>] usb_hcd_irq
> [<ffffffff8138a0f0>] usb_hcd_irq
> [<ffffffff8138a0f0>] 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.
ping. Any comments?
Thanks,
Takahiro
>
> Signed-off-by: MUNEDA Takahiro<muneda.takahiro@xxxxxxxxxxxxxx>
>
> ---
> Documentation/kernel-parameters.txt | 4 ++++
> drivers/pci/pcie/portdrv.h | 12 ++++++++++++
> drivers/pci/pcie/portdrv_core.c | 16 ++++++++++++++--
> 3 files changed, 30 insertions(+), 2 deletions(-)
>
> Index: linux-3.3-rc2/drivers/pci/pcie/portdrv.h
> ===================================================================
> --- linux-3.3-rc2.orig/drivers/pci/pcie/portdrv.h
> +++ linux-3.3-rc2/drivers/pci/pcie/portdrv.h
> @@ -34,6 +34,18 @@ struct pci_dev;
>
> extern void pcie_clear_root_pme_status(struct pci_dev *dev);
>
> +#ifdef CONFIG_HOTPLUG_PCI_PCIE
> +extern bool pciehp_msi_disabled;
> +
> +static inline bool pciehp_no_msi(void)
> +{
> + return pciehp_msi_disabled;
> +}
> +
> +#else /* !CONFIG_HOTPLUG_PCI_PCIE */
> +static inline bool pciehp_no_msi(void) { return false; }
> +#endif /* !CONFIG_HOTPLUG_PCI_PCIE */
> +
> #ifdef CONFIG_PCIE_PME
> extern bool pcie_pme_msi_disabled;
>
> Index: linux-3.3-rc2/drivers/pci/pcie/portdrv_core.c
> ===================================================================
> --- linux-3.3-rc2.orig/drivers/pci/pcie/portdrv_core.c
> +++ linux-3.3-rc2/drivers/pci/pcie/portdrv_core.c
> @@ -19,6 +19,17 @@
> #include "../pci.h"
> #include "portdrv.h"
>
> +bool pciehp_msi_disabled;
> +
> +static int __init pciehp_setup(char *str)
> +{
> + if (!strncmp(str, "nomsi", 5))
> + pciehp_msi_disabled = true;
> +
> + return 1;
> +}
> +__setup("pcie_hp=", pciehp_setup);
> +
> /**
> * release_pcie_device - free PCI Express port service device structure
> * @dev: Port service device to release
> @@ -189,8 +200,9 @@ static int init_service_irqs(struct pci_
> {
> int i, irq = -1;
>
> - /* We have to use INTx if MSI cannot be used for PCIe PME. */
> - if ((mask& PCIE_PORT_SERVICE_PME)&& pcie_pme_no_msi()) {
> + /* We have to use INTx if MSI cannot be used for PCIe PME or pciehp. */
> + if (((mask& PCIE_PORT_SERVICE_PME)&& pcie_pme_no_msi()) ||
> + ((mask& PCIE_PORT_SERVICE_HP)&& pciehp_no_msi())) {
> if (dev->pin)
> irq = dev->irq;
> goto no_msi;
> Index: linux-3.3-rc2/Documentation/kernel-parameters.txt
> ===================================================================
> --- linux-3.3-rc2.orig/Documentation/kernel-parameters.txt
> +++ linux-3.3-rc2/Documentation/kernel-parameters.txt
> @@ -2118,6 +2118,10 @@ bytes respectively. Such letter suffixes
> 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
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