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    SubjectRe: SR-IOV problem with Intel 82599EB (not enough MMIO resources for SR-IOV)
    From
    On Fri, Nov 9, 2012 at 7:26 AM, Bjorn Helgaas <bhelgaas@google.com> wrote:
    > [+ linux-pci, Yinghai]
    >
    > On Thu, Nov 8, 2012 at 8:59 PM, Jason Gao <pkill.2012@gmail.com> wrote:
    >>> The BIOS in your machine doesn't support SR-IOV. You'll need to ask the manufacturer for a BIOS upgrade, if in fact one is available. Sometimes they're not.
    >>
    >> very thanks Greg,my server Dell R710 with latest BIOS version and
    >> option for SR-IOV(SR-IOV Global Enable->Enabled) opened,I'm confused
    >> that Does R710 provide full support for SR-IOV, kernel or ixgbe
    >> driver's bug? but I'm not sure where the problem lies,anyone has any
    >> experience about this? .
    >
    > Linux normally uses the resource assignments done by the BIOS, but it
    > is possible for the kernel to reassign those. We don't have good
    > automatic support for that yet, but on a recent upstream kernel, you
    > can try "pci=realloc". I doubt this option is in CentOS 6.3, though.
    >
    > If an upstream kernel with "pci=realloc" still doesn't work, please
    > post the entire dmesg log.

    Even better, upstream kernel will enable realloc automatically if it
    finds some SRIOV BAR is not assigned.
    related logic is in pci_realloc_detect().

    BTW, we may need another patch about realloc.

    http://git.kernel.org/?p=linux/kernel/git/yinghai/linux-yinghai.git;a=patch;h=afb9975bddd92b17c2f9859676ce521e2e014997

    From afb9975bddd92b17c2f9859676ce521e2e014997 Mon Sep 17 00:00:00 2001
    From: Yinghai Lu <yinghai@kernel.org>
    Date: Wed, 3 Oct 2012 19:15:57 -0700
    Subject: [PATCH] PCI: Add root bus children dev's res to fail list

    We can stop trying according to try number now and do not need to use
    root_bus checking as stop sign anymore.
    In extreme case we could need to reallocate resource for device just
    under root bus.

    Signed-off-by: Yinghai Lu <yinghai@kernel.org>
    ---
    drivers/pci/setup-bus.c | 2 +-
    1 files changed, 1 insertions(+), 1 deletions(-)

    diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
    index 1e808ca..9e625d84 100644
    --- a/drivers/pci/setup-bus.c
    +++ b/drivers/pci/setup-bus.c
    @@ -283,7 +283,7 @@ static void
    assign_requested_resources_sorted(struct list_head *head,
    idx = res - &dev_res->dev->resource[0];
    if (resource_size(res) &&
    pci_assign_resource(dev_res->dev, idx)) {
    - if (fail_head && !pci_is_root_bus(dev_res->dev->bus)) {
    + if (fail_head) {
    /*
    * if the failed res is for ROM BAR, and it will
    * be enabled later, don't add it to the list
    --
    1.7.7.6

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