On Mon, Oct 10, 2011 at 7:58 AM, Prarit Bhargava <prarit@xxxxxxxxxx> wrote:
> To help debugging, add a kernel parameter, pci=sriov=[0|1], which enables or
> disables SRIOV.
>
> Signed-off-by: Prarit Bhargava <prarit@xxxxxxxxxx>
> Cc: ddutile@xxxxxxxxxx
> Cc: bhelgaas@xxxxxxxxxx
> ---
> Documentation/kernel-parameters.txt | 3 +++
> drivers/pci/iov.c | 31 ++++++++++++++++++++++++++++++-
> drivers/pci/pci.c | 2 ++
> drivers/pci/pci.h | 3 +++
> 4 files changed, 38 insertions(+), 1 deletions(-)
>
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 854ed5c..7ad2d32 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -2032,6 +2032,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
> on: Turn ECRC on.
> realloc reallocate PCI resources if allocations done by BIOS
> are erroneous.
> + sriov= [HW]
> + Format: [0|1]
> + Enable or disable SRIOV support in kernel.
>
> pcie_aspm= [PCIE] Forcibly enable or disable PCIe Active State Power
> Management.
> diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
> index 42fae47..4a861df 100644
> --- a/drivers/pci/iov.c
> +++ b/drivers/pci/iov.c
> @@ -408,6 +408,20 @@ static void sriov_disable(struct pci_dev *dev)
> iov->nr_virtfn = 0;
> }
>
> +unsigned int pci_sriov_enabled = 1;
> +
> +static int __init do_sriov_enable(char *str)
> +{
> + get_option(&str, &pci_sriov_enabled);
> + if (!pci_sriov_enabled)
> + printk(KERN_INFO "SRIOV: Disabled\n");
> + else
> + printk(KERN_INFO "SRIOV: Enabled\n");
> +
> + return 1;
> +}
> +__setup("sriov=", do_sriov_enable);
> +
what is the point sriov=1? are you going to enable sriov forcefully?
pci=nosriov
should be more reasonable.
Yinghai
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