On Fri, Nov 9, 2012 at 7:26 AM, Bjorn Helgaas <bhelgaas@xxxxxxxxxx> wrote: > [+ linux-pci, Yinghai] > > On Thu, Nov 8, 2012 at 8:59 PM, Jason Gao <pkill.2012@xxxxxxxxx> 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@xxxxxxxxxx> 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@xxxxxxxxxx> --- 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 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
