[PATCH 0/3] Boot IRQ quirks for Broadcom and AMD/ATI - Kernel

This is a discussion on [PATCH 0/3] Boot IRQ quirks for Broadcom and AMD/ATI - Kernel ; This is against linux-2.6-tip, branch pci-ioapic-boot-irq-quirks. The corrected versions of the Broadcom and AMD/ATI boot IRQ quirks, and a patch that uses DECLARE_PCI_FIXUP_FINAL instead of *_EARLY, and adds *_RESUME. The AMD/ATI SB700S does not need a quirk. The boot IRQs ...

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Thread: [PATCH 0/3] Boot IRQ quirks for Broadcom and AMD/ATI

  1. [PATCH 0/3] Boot IRQ quirks for Broadcom and AMD/ATI

    This is against linux-2.6-tip, branch pci-ioapic-boot-irq-quirks.

    The corrected versions of the Broadcom and AMD/ATI boot IRQ quirks, and
    a patch that uses DECLARE_PCI_FIXUP_FINAL instead of *_EARLY, and adds
    *_RESUME.

    The AMD/ATI SB700S does not need a quirk. The boot IRQs here are active
    even when the IO-APIC lines are not masked. So even for traditional IRQ
    handling that does not use masking, the boot IRQs need to be disabled by
    the BIOS. If there are actual cases of BIOSes that do not disable these
    boot IRQs in APIC mode, we could consider including an SB700S patch. But
    I doubt this will be needed, as this problem would quickly surface
    during testing with any general-purpose OS.

    The quirk for the AMD 8131 and AMD 8132 takes identical action as an
    existing quirk for the AMD 8131 rev. A0 and B0. The existing quirk is
    due to an AMD erratum to fix IO-APIC mode. Our patch now deletes the
    older quirk and adds a comment to the new one that describes the two
    purposes of the quirk.

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  2. [PATCH 2/3] disable AMD/ATI legacy boot interrupt generation

    From: Olaf Dabrunz

    Add quirks for several AMD/ATI chipsets to prevent generation of legacy boot
    interrupts.

    Integrates a separate older quirk to make IO-APIC mode work on AMD 8131 rev. A0
    and B0, which was due to an AMD erratum.

    Signed-off-by: Olaf Dabrunz
    Signed-off-by: Stefan Assmann
    ---
    drivers/pci/quirks.c | 71 +++++++++++++++++++++++++++++++++++---------------
    1 files changed, 50 insertions(+), 21 deletions(-)

    diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
    index b3ec3f8..2f78d6f 100644
    --- a/drivers/pci/quirks.c
    +++ b/drivers/pci/quirks.c
    @@ -602,27 +602,6 @@ static void __init quirk_ioapic_rmw(struct pci_dev *dev)
    sis_apic_bug = 1;
    }
    DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_SI, PCI_ANY_ID, quirk_ioapic_rmw);
    -
    -#define AMD8131_revA0 0x01
    -#define AMD8131_revB0 0x11
    -#define AMD8131_MISC 0x40
    -#define AMD8131_NIOAMODE_BIT 0
    -static void quirk_amd_8131_ioapic(struct pci_dev *dev)
    -{
    - unsigned char tmp;
    -
    - if (nr_ioapics == 0)
    - return;
    -
    - if (dev->revision == AMD8131_revA0 || dev->revision == AMD8131_revB0) {
    - dev_info(&dev->dev, "Fixing up AMD8131 IOAPIC mode\n");
    - pci_read_config_byte( dev, AMD8131_MISC, &tmp);
    - tmp &= ~(1 << AMD8131_NIOAMODE_BIT);
    - pci_write_config_byte( dev, AMD8131_MISC, tmp);
    - }
    -}
    -DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8131_BRIDGE, quirk_amd_8131_ioapic);
    -DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8131_BRIDGE, quirk_amd_8131_ioapic);
    #endif /* CONFIG_X86_IO_APIC */

    /*
    @@ -1449,6 +1428,56 @@ static void quirk_disable_broadcom_boot_interrupt(struct pci_dev *dev)
    "0x%04x:0x%04x\n", dev->vendor, dev->device);
    }
    DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_HT1000SB, quirk_disable_broadcom_boot_interrupt);
    +
    +/*
    + * disable boot interrupts on AMD and ATI chipsets
    + */
    +/*
    + * NOIOAMODE needs to be disabled to disable "boot interrupts". For AMD 8131
    + * rev. A0 and B0, NOIOAMODE needs to be disabled anyway to fix IO-APIC mode
    + * (due to an erratum).
    + */
    +#define AMD_813X_MISC 0x40
    +#define AMD_813X_NOIOAMODE (1<<0)
    +
    +static void quirk_disable_amd_813x_boot_interrupt(struct pci_dev *dev)
    +{
    + u32 pci_config_dword;
    +
    + if (noioapicquirk)
    + return;
    +
    + pci_read_config_dword(dev, AMD_813X_MISC, &pci_config_dword);
    + pci_config_dword &= ~AMD_813X_NOIOAMODE;
    + pci_write_config_dword(dev, AMD_813X_MISC, pci_config_dword);
    +
    + printk(KERN_INFO "disabled boot interrupts on PCI device "
    + "0x%04x:0x%04x\n", dev->vendor, dev->device);
    +}
    +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8131_BRIDGE, quirk_disable_amd_813x_boot_interrupt);
    +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8132_BRIDGE, quirk_disable_amd_813x_boot_interrupt);
    +
    +#define AMD_8111_PCI_IRQ_ROUTING 0x56
    +
    +static void quirk_disable_amd_8111_boot_interrupt(struct pci_dev *dev)
    +{
    + u16 pci_config_word;
    +
    + if (noioapicquirk)
    + return;
    +
    + pci_read_config_word(dev, AMD_8111_PCI_IRQ_ROUTING, &pci_config_word);
    + if (!pci_config_word) {
    + printk(KERN_INFO "boot interrupts on PCI device 0x%04x:0x%04x "
    + "already disabled\n",
    + dev->vendor, dev->device);
    + return;
    + }
    + pci_write_config_word(dev, AMD_8111_PCI_IRQ_ROUTING, 0);
    + printk(KERN_INFO "disabled boot interrupts on PCI device "
    + "0x%04x:0x%04x\n", dev->vendor, dev->device);
    +}
    +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS, quirk_disable_amd_8111_boot_interrupt);
    #endif /* CONFIG_X86_IO_APIC */

    /*
    --
    1.5.2.4

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  3. [PATCH 1/3] Add quirk to disable boot interrupt generation on broadcom HT1000

    From: Olaf Dabrunz

    Signed-off-by: Olaf Dabrunz
    Signed-off-by: Stefan Assmann
    ---
    drivers/pci/quirks.c | 32 ++++++++++++++++++++++++++++++++
    1 files changed, 32 insertions(+), 0 deletions(-)

    diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
    index 292cf26..b3ec3f8 100644
    --- a/drivers/pci/quirks.c
    +++ b/drivers/pci/quirks.c
    @@ -1417,6 +1417,38 @@ static void quirk_disable_intel_boot_interrupt(struct pci_dev *dev)
    dev->vendor, dev->device);
    }
    DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_10, quirk_disable_intel_boot_interrupt);
    +
    +/*
    + * disable boot interrupts on HT-1000
    + */
    +#define BC_HT1000_FEATURE_REG 0x64
    +#define BC_HT1000_PIC_REGS_ENABLE (1<<0)
    +#define BC_HT1000_MAP_IDX 0xC00
    +#define BC_HT1000_MAP_DATA 0xC01
    +
    +static void quirk_disable_broadcom_boot_interrupt(struct pci_dev *dev)
    +{
    + u32 pci_config_dword;
    + u8 irq;
    +
    + if (noioapicquirk)
    + return;
    +
    + pci_read_config_dword(dev, BC_HT1000_FEATURE_REG, &pci_config_dword);
    + pci_write_config_dword(dev, BC_HT1000_FEATURE_REG, pci_config_dword |
    + BC_HT1000_PIC_REGS_ENABLE);
    +
    + for (irq = 0x10; irq < 0x10 + 32; irq++) {
    + outb(irq, BC_HT1000_MAP_IDX);
    + outb(0x00, BC_HT1000_MAP_DATA);
    + }
    +
    + pci_write_config_dword(dev, BC_HT1000_FEATURE_REG, pci_config_dword);
    +
    + printk(KERN_INFO "disabled boot interrupts on PCI device"
    + "0x%04x:0x%04x\n", dev->vendor, dev->device);
    +}
    +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SERVERWORKS , PCI_DEVICE_ID_SERVERWORKS_HT1000SB, quirk_disable_broadcom_boot_interrupt);
    #endif /* CONFIG_X86_IO_APIC */

    /*
    --
    1.5.2.4

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  4. Re: [PATCH 0/3] Boot IRQ quirks for Broadcom and AMD/ATI


    * Olaf Dabrunz wrote:

    > This is against linux-2.6-tip, branch pci-ioapic-boot-irq-quirks.
    >
    > The corrected versions of the Broadcom and AMD/ATI boot IRQ quirks,
    > and a patch that uses DECLARE_PCI_FIXUP_FINAL instead of *_EARLY, and
    > adds *_RESUME.
    >
    > The AMD/ATI SB700S does not need a quirk. The boot IRQs here are
    > active even when the IO-APIC lines are not masked. So even for
    > traditional IRQ handling that does not use masking, the boot IRQs need
    > to be disabled by the BIOS. If there are actual cases of BIOSes that
    > do not disable these boot IRQs in APIC mode, we could consider
    > including an SB700S patch. But I doubt this will be needed, as this
    > problem would quickly surface during testing with any general-purpose
    > OS.
    >
    > The quirk for the AMD 8131 and AMD 8132 takes identical action as an
    > existing quirk for the AMD 8131 rev. A0 and B0. The existing quirk is
    > due to an AMD erratum to fix IO-APIC mode. Our patch now deletes the
    > older quirk and adds a comment to the new one that describes the two
    > purposes of the quirk.


    applied to tip/x86/pci-ioapic-boot-irq-quirks, thanks Olaf.

    Jesse, what do you think about this topic? We are keeping it separate
    for the time being. They are not particularly pretty, but being able to
    mask/unmask irqs (without generating those legacy IRQs and creating an
    IRQ storm) is essential to -rt.

    Ingo
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  5. Re: [PATCH 0/3] Boot IRQ quirks for Broadcom and AMD/ATI

    On Sunday, July 13, 2008 2:01 pm Ingo Molnar wrote:
    > * Olaf Dabrunz wrote:
    > > This is against linux-2.6-tip, branch pci-ioapic-boot-irq-quirks.
    > >
    > > The corrected versions of the Broadcom and AMD/ATI boot IRQ quirks,
    > > and a patch that uses DECLARE_PCI_FIXUP_FINAL instead of *_EARLY, and
    > > adds *_RESUME.
    > >
    > > The AMD/ATI SB700S does not need a quirk. The boot IRQs here are
    > > active even when the IO-APIC lines are not masked. So even for
    > > traditional IRQ handling that does not use masking, the boot IRQs need
    > > to be disabled by the BIOS. If there are actual cases of BIOSes that
    > > do not disable these boot IRQs in APIC mode, we could consider
    > > including an SB700S patch. But I doubt this will be needed, as this
    > > problem would quickly surface during testing with any general-purpose
    > > OS.
    > >
    > > The quirk for the AMD 8131 and AMD 8132 takes identical action as an
    > > existing quirk for the AMD 8131 rev. A0 and B0. The existing quirk is
    > > due to an AMD erratum to fix IO-APIC mode. Our patch now deletes the
    > > older quirk and adds a comment to the new one that describes the two
    > > purposes of the quirk.

    >
    > applied to tip/x86/pci-ioapic-boot-irq-quirks, thanks Olaf.
    >
    > Jesse, what do you think about this topic? We are keeping it separate
    > for the time being. They are not particularly pretty, but being able to
    > mask/unmask irqs (without generating those legacy IRQs and creating an
    > IRQ storm) is essential to -rt.


    See my other reply; the branch looks good. I agree that making sure -rt can
    work is an important feature. My only concern is that this is touching so
    much hardware specific code that *something* is likely to break. But as long
    as Olaf & co. can help track down any issues, I'm ok with it.

    Thanks,
    Jesse
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  6. Re: [PATCH 0/3] Boot IRQ quirks for Broadcom and AMD/ATI


    * Jesse Barnes wrote:

    > > applied to tip/x86/pci-ioapic-boot-irq-quirks, thanks Olaf.
    > >
    > > Jesse, what do you think about this topic? We are keeping it
    > > separate for the time being. They are not particularly pretty, but
    > > being able to mask/unmask irqs (without generating those legacy IRQs
    > > and creating an IRQ storm) is essential to -rt.

    >
    > See my other reply; the branch looks good. I agree that making sure
    > -rt can work is an important feature. My only concern is that this is
    > touching so much hardware specific code that *something* is likely to
    > break. But as long as Olaf & co. can help track down any issues, I'm
    > ok with it.


    ok. We'll cook it a bit more in tip/master and then send it over to you
    once all the dependent changes have gone upstream in the merge window,
    ok? I think it's v2.6.27 worthy stuff - nicely localized, sufficiently
    finegrained and any problems with it has to be debugged the hard way by
    exposing people to them ...

    Ingo
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  7. Re: [PATCH 0/3] Boot IRQ quirks for Broadcom and AMD/ATI

    On Monday, July 14, 2008 9:49 am Olaf Dabrunz wrote:
    > On 14-Jul-08, Ingo Molnar wrote:
    > > * Jesse Barnes wrote:
    > > > > applied to tip/x86/pci-ioapic-boot-irq-quirks, thanks Olaf.
    > > > >
    > > > > Jesse, what do you think about this topic? We are keeping it
    > > > > separate for the time being. They are not particularly pretty, but
    > > > > being able to mask/unmask irqs (without generating those legacy IRQs
    > > > > and creating an IRQ storm) is essential to -rt.
    > > >
    > > > See my other reply; the branch looks good. I agree that making sure
    > > > -rt can work is an important feature. My only concern is that this is
    > > > touching so much hardware specific code that *something* is likely to
    > > > break. But as long as Olaf & co. can help track down any issues, I'm
    > > > ok with it.

    > >
    > > ok. We'll cook it a bit more in tip/master and then send it over to you
    > > once all the dependent changes have gone upstream in the merge window,
    > > ok? I think it's v2.6.27 worthy stuff - nicely localized, sufficiently
    > > finegrained and any problems with it has to be debugged the hard way by
    > > exposing people to them ...

    >
    > Ack.


    Sounds good, thanks. Now to get my merge bits pulled together & tested...

    Jesse
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  8. Re: [PATCH 0/3] Boot IRQ quirks for Broadcom and AMD/ATI

    On 14-Jul-08, Ingo Molnar wrote:
    >
    > * Jesse Barnes wrote:
    >
    > > > applied to tip/x86/pci-ioapic-boot-irq-quirks, thanks Olaf.
    > > >
    > > > Jesse, what do you think about this topic? We are keeping it
    > > > separate for the time being. They are not particularly pretty, but
    > > > being able to mask/unmask irqs (without generating those legacy IRQs
    > > > and creating an IRQ storm) is essential to -rt.

    > >
    > > See my other reply; the branch looks good. I agree that making sure
    > > -rt can work is an important feature. My only concern is that this is
    > > touching so much hardware specific code that *something* is likely to
    > > break. But as long as Olaf & co. can help track down any issues, I'm
    > > ok with it.

    >
    > ok. We'll cook it a bit more in tip/master and then send it over to you
    > once all the dependent changes have gone upstream in the merge window,
    > ok? I think it's v2.6.27 worthy stuff - nicely localized, sufficiently
    > finegrained and any problems with it has to be debugged the hard way by
    > exposing people to them ...


    Ack.

    Thanks,

    --
    Olaf Dabrunz (od/odabrunz), SUSE Linux Products GmbH, Nürnberg

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  9. Re: [PATCH 0/3] Boot IRQ quirks for Broadcom and AMD/ATI

    On 14-Jul-08, Olaf Dabrunz wrote:
    > On 14-Jul-08, Ingo Molnar wrote:
    > >
    > > * Jesse Barnes wrote:
    > >
    > > > > applied to tip/x86/pci-ioapic-boot-irq-quirks, thanks Olaf.
    > > > >
    > > > > Jesse, what do you think about this topic? We are keeping it
    > > > > separate for the time being. They are not particularly pretty, but
    > > > > being able to mask/unmask irqs (without generating those legacy IRQs
    > > > > and creating an IRQ storm) is essential to -rt.
    > > >
    > > > See my other reply; the branch looks good. I agree that making sure
    > > > -rt can work is an important feature. My only concern is that this is
    > > > touching so much hardware specific code that *something* is likely to
    > > > break. But as long as Olaf & co. can help track down any issues, I'm
    > > > ok with it.

    > >
    > > ok. We'll cook it a bit more in tip/master and then send it over to you
    > > once all the dependent changes have gone upstream in the merge window,
    > > ok? I think it's v2.6.27 worthy stuff - nicely localized, sufficiently
    > > finegrained and any problems with it has to be debugged the hard way by
    > > exposing people to them ...

    >
    > Ack.


    I am working on a consolidated patch set for AKMP. It integrates all
    fixes and adds a config option CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS
    (prepared by Stefan Assmann), which can default to off for vanilla and to
    on for RT / threaded IRQ handling. This means that the whole patchset
    can (in principle) be applied to vanilla and RT without change. Also
    CONFIG_PREEMPT_HARDIRQ can "select CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS".

    If you don't mind, I will send the full set out today.

    --
    Olaf Dabrunz (od/odabrunz), SUSE Linux Products GmbH, Nürnberg

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  10. Re: [PATCH 0/3] Boot IRQ quirks for Broadcom and AMD/ATI

    On 14-Jul-08, Jesse Barnes wrote:
    > On Sunday, July 13, 2008 2:01 pm Ingo Molnar wrote:
    > > * Olaf Dabrunz wrote:
    > > > This is against linux-2.6-tip, branch pci-ioapic-boot-irq-quirks.
    > > >
    > > > The corrected versions of the Broadcom and AMD/ATI boot IRQ quirks,
    > > > and a patch that uses DECLARE_PCI_FIXUP_FINAL instead of *_EARLY, and
    > > > adds *_RESUME.
    > > >
    > > > The AMD/ATI SB700S does not need a quirk. The boot IRQs here are
    > > > active even when the IO-APIC lines are not masked. So even for
    > > > traditional IRQ handling that does not use masking, the boot IRQs need
    > > > to be disabled by the BIOS. If there are actual cases of BIOSes that
    > > > do not disable these boot IRQs in APIC mode, we could consider
    > > > including an SB700S patch. But I doubt this will be needed, as this
    > > > problem would quickly surface during testing with any general-purpose
    > > > OS.
    > > >
    > > > The quirk for the AMD 8131 and AMD 8132 takes identical action as an
    > > > existing quirk for the AMD 8131 rev. A0 and B0. The existing quirk is
    > > > due to an AMD erratum to fix IO-APIC mode. Our patch now deletes the
    > > > older quirk and adds a comment to the new one that describes the two
    > > > purposes of the quirk.

    > >
    > > applied to tip/x86/pci-ioapic-boot-irq-quirks, thanks Olaf.
    > >
    > > Jesse, what do you think about this topic? We are keeping it separate
    > > for the time being. They are not particularly pretty, but being able to
    > > mask/unmask irqs (without generating those legacy IRQs and creating an
    > > IRQ storm) is essential to -rt.

    >
    > See my other reply; the branch looks good. I agree that making sure -rt can
    > work is an important feature. My only concern is that this is touching so
    > much hardware specific code that *something* is likely to break. But as long
    > as Olaf & co. can help track down any issues, I'm ok with it.


    We should be able to help with issues. We do not think it will be
    necessary often.

    Here is why we are confident:

    We believe the patches that disable boot IRQs are safe. In general this
    is code that should be part of the _PIC method in ACPI BIOSes. Some
    BIOSes already integrate such code. We basically cover up for BIOSes
    that are broken or that simply do not care about RT / threaded IRQs.

    The chipsets that do not have an option for disabling the boot IRQs are
    handled by the "reroute" workaround. It may increase interrupt sharing
    (depending on the IRQ routing of other devices), but makes sure that the
    boot IRQ mechanism does not generate two separate IRQs.

    This workaround is also pretty safe, as we can follow the IRQ routing
    through the chips. One or two recent/upcoming north bridges have
    different IRQ handling capabilities, so we need to update the reroute
    patch for them. This is WIP.

    We take much care to only improve the situation:

    - By default, the safest setting is used. No actions are taken in
    PIC mode. In APIC mode: disable boot IRQs whenever we can,
    "reroute" for RT/threaded IRQ handling, don't reroute for vanilla.
    (The mechanism for the rerouting defaults is in the upcoming
    CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS patch. RT should "select"
    this config option.)

    - Kernel command line options can be used to disable the reroute
    quirks or all quirks.

    - Only known chipsets are handled (-- the reroute patch will be
    updated to also check and handle the north bridge, if necessary).

    We are also preparing a paper that should clarify the whole thing, so
    the information will not "die with us".

    Thanks,

    --
    Olaf Dabrunz (od/odabrunz), SUSE Linux Products GmbH, Nürnberg

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  11. Re: [PATCH 0/3] Boot IRQ quirks for Broadcom and AMD/ATI

    On 14-Jul-08, Olaf Dabrunz wrote:
    > I am working on a consolidated patch set for AKMP. It integrates all
    > fixes and adds a config option CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS
    > (prepared by Stefan Assmann), which can default to off for vanilla and to
    > on for RT / threaded IRQ handling. This means that the whole patchset
    > can (in principle) be applied to vanilla and RT without change. Also
    > CONFIG_PREEMPT_HARDIRQ can "select CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS".
    >
    > If you don't mind, I will send the full set out today.


    On second thought and after talking to Stefan, as you think the patches
    can go into 2.6.27 as they are, there is not much benefit in integrating
    the fixes and the config option patch. Stefan will commit the config
    option patch to tip tomorrow.

    Thanks,

    --
    Olaf Dabrunz (od/odabrunz), SUSE Linux Products GmbH, Nürnberg

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  12. Re: [PATCH 0/3] Boot IRQ quirks for Broadcom and AMD/ATI


    * Olaf Dabrunz wrote:

    > On 14-Jul-08, Olaf Dabrunz wrote:
    > > I am working on a consolidated patch set for AKMP. It integrates all
    > > fixes and adds a config option CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS
    > > (prepared by Stefan Assmann), which can default to off for vanilla and to
    > > on for RT / threaded IRQ handling. This means that the whole patchset
    > > can (in principle) be applied to vanilla and RT without change. Also
    > > CONFIG_PREEMPT_HARDIRQ can "select CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS".
    > >
    > > If you don't mind, I will send the full set out today.

    >
    > On second thought and after talking to Stefan, as you think the
    > patches can go into 2.6.27 as they are, there is not much benefit in
    > integrating the fixes and the config option patch. Stefan will commit
    > the config option patch to tip tomorrow.


    please do not rebase the patchset, that causes us lose the testing
    status, we lose the sha1's of the commits, etc. Lets keep what we have
    in tip/x86/pci-ioapic-boot-irq-quirks and do append-only fixlets to it.

    Ingo
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  13. Re: [PATCH 0/3] Boot IRQ quirks for Broadcom and AMD/ATI

    On 14-Jul-08, Ingo Molnar wrote:
    >
    > * Olaf Dabrunz wrote:
    >
    > > On 14-Jul-08, Olaf Dabrunz wrote:
    > > > I am working on a consolidated patch set for AKMP. It integrates all
    > > > fixes and adds a config option CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS
    > > > (prepared by Stefan Assmann), which can default to off for vanilla and to
    > > > on for RT / threaded IRQ handling. This means that the whole patchset
    > > > can (in principle) be applied to vanilla and RT without change. Also
    > > > CONFIG_PREEMPT_HARDIRQ can "select CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS".
    > > >
    > > > If you don't mind, I will send the full set out today.

    > >
    > > On second thought and after talking to Stefan, as you think the
    > > patches can go into 2.6.27 as they are, there is not much benefit in
    > > integrating the fixes and the config option patch. Stefan will commit
    > > the config option patch to tip tomorrow.

    >
    > please do not rebase the patchset, that causes us lose the testing
    > status, we lose the sha1's of the commits, etc. Lets keep what we have
    > in tip/x86/pci-ioapic-boot-irq-quirks and do append-only fixlets to it.


    Right.

    Thanks,

    --
    Olaf Dabrunz (od/odabrunz), SUSE Linux Products GmbH, Nürnberg

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  14. [PATCH] Introduce config option for pci reroute quirks (was: [PATCH 0/3] Boot IRQ quirks for Broadcom and AMD/ATI)

    This is against linux-2.6-tip, branch pci-ioapic-boot-irq-quirks.

    From: Stefan Assmann
    Subject: Introduce config option for pci reroute quirks

    The config option X86_REROUTE_FOR_BROKEN_BOOT_IRQS is introduced to
    enable (or disable) the redirection of the interrupt handler to the boot
    interrupt line by default. Depending on the existence of interrupt
    masking / threaded interrupt handling in the kernel (vanilla, rt, ...)
    and the maturity of the rerouting patch, users can enable or disable the
    redirection by default.

    This means that the reroute quirk can be applied to any kernel without
    changing it.

    Interrupt sharing could be increased if this option is enabled. However this
    option is vital for threaded interrupt handling, as done by the RT kernel.
    It should simplify the consolidation with the RT kernel.

    The option can be overridden by either pci=ioapicreroute or
    pci=noioapicreroute.

    Signed-off-by: Stefan Assmann
    Signed-off-by: Olaf Dabrunz
    ---
    Documentation/kernel-parameters.txt | 4 ++++
    arch/x86/Kconfig | 24 ++++++++++++++++++++++++
    arch/x86/pci/common.c | 8 ++++++++
    drivers/pci/quirks.c | 2 +-
    include/asm-x86/pci.h | 2 +-
    5 files changed, 38 insertions(+), 2 deletions(-)

    --- a/arch/x86/pci/common.c
    +++ b/arch/x86/pci/common.c
    @@ -23,7 +23,11 @@ unsigned int pci_probe = PCI_PROBE_BIOS
    static int pci_bf_sort;
    int pci_routeirq;
    int noioapicquirk;
    +#ifdef CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS
    +int noioapicreroute = 0;
    +#else
    int noioapicreroute = 1;
    +#endif
    int pcibios_last_bus = -1;
    unsigned long pirq_table_addr;
    struct pci_bus *pci_root_bus;
    @@ -504,6 +508,10 @@ char * __devinit pcibios_setup(char *st
    if (noioapicreroute != -1)
    noioapicreroute = 0;
    return NULL;
    + } else if (!strcmp(str, "noioapicreroute")) {
    + if (noioapicreroute != -1)
    + noioapicreroute = 1;
    + return NULL;
    }
    return str;
    }
    --- a/include/asm-x86/pci.h
    +++ b/include/asm-x86/pci.h
    @@ -20,7 +20,7 @@ struct pci_sysdata {

    extern int pci_routeirq;
    extern int noioapicquirk;
    -extern int ioapicreroute;
    +extern int noioapicreroute;

    /* scan a bus after allocating a pci_sysdata for it */
    extern struct pci_bus *pci_scan_bus_on_node(int busno, struct pci_ops *ops,
    --- a/drivers/pci/quirks.c
    +++ b/drivers/pci/quirks.c
    @@ -1351,7 +1351,7 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_IN
    */
    static void quirk_reroute_to_boot_interrupts_intel(struct pci_dev *dev)
    {
    - if (noioapicquirk)
    + if (noioapicquirk || noioapicreroute)
    return;

    dev->irq_reroute_variant = INTEL_IRQ_REROUTE_VARIANT;
    --- a/Documentation/kernel-parameters.txt
    +++ b/Documentation/kernel-parameters.txt
    @@ -1525,6 +1525,10 @@ and is between 256 and 4096 characters.
    primary IO-APIC for bridges that cannot disable
    boot IRQs. This fixes a source of spurious IRQs
    when the system masks IRQs.
    + noioapicreroute [APIC] Disable workaround that uses the
    + boot IRQ equivalent of an IRQ that connects to
    + a chipset where boot IRQs cannot be disabled.
    + The opposite of ioapicreroute.
    biosirq [X86-32] Use PCI BIOS calls to get the interrupt
    routing table. These calls are known to be buggy
    on several machines and they hang the machine
    --- a/arch/x86/Kconfig
    +++ b/arch/x86/Kconfig
    @@ -663,6 +663,30 @@ config X86_VISWS_APIC
    def_bool y
    depends on X86_32 && X86_VISWS

    +config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
    + bool "Reroute for broken boot IRQs"
    + default n
    + depends on X86_IO_APIC
    + help
    + This option enables a workaround that fixes a source of
    + spurious interrupts. This is recommended when threaded
    + interrupt handling is used on systems where the generation of
    + superfluous "boot interrupts" cannot be disabled.
    +
    + Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
    + entry in the chipset's IO-APIC is masked (as, e.g. the RT
    + kernel does during interrupt handling). On chipsets where this
    + boot IRQ generation cannot be disabled, this workaround keeps
    + the original IRQ line masked so that only the equivalent "boot
    + IRQ" is delivered to the CPUs. The workaround also tells the
    + kernel to set up the IRQ handler on the boot IRQ line. In this
    + way only one interrupt is delivered to the kernel. Otherwise
    + the spurious second interrupt may cause the kernel to bring
    + down (vital) interrupt lines.
    +
    + Only affects "broken" chipsets. Interrupt sharing may be
    + increased on these systems.
    +
    config X86_MCE
    bool "Machine Check Exception"
    depends on !X86_VOYAGER

    --
    Stefan Assmann | SUSE LINUX Products GmbH
    Software Engineer | Maxfeldstr. 5, D-90409 Nuernberg
    Mail : sassmann@suse.de | GF: Markus Rex, HRB 16746 (AG Nuernberg)
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  15. Re: [PATCH] Introduce config option for pci reroute quirks (was: [PATCH 0/3] Boot IRQ quirks for Broadcom and AMD/ATI)


    * Stefan Assmann wrote:

    > This is against linux-2.6-tip, branch pci-ioapic-boot-irq-quirks.
    >
    > From: Stefan Assmann
    > Subject: Introduce config option for pci reroute quirks
    >
    > The config option X86_REROUTE_FOR_BROKEN_BOOT_IRQS is introduced to
    > enable (or disable) the redirection of the interrupt handler to the
    > boot interrupt line by default. Depending on the existence of
    > interrupt masking / threaded interrupt handling in the kernel
    > (vanilla, rt, ...) and the maturity of the rerouting patch, users can
    > enable or disable the redirection by default.
    >
    > This means that the reroute quirk can be applied to any kernel without
    > changing it.
    >
    > Interrupt sharing could be increased if this option is enabled.
    > However this option is vital for threaded interrupt handling, as done
    > by the RT kernel. It should simplify the consolidation with the RT
    > kernel.
    >
    > The option can be overridden by either pci=ioapicreroute or
    > pci=noioapicreroute.


    applied, thanks Stefan.

    Ingo
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